BATTERY DEVICE

Abstract

A battery device is provided which includes a cell stack of rechargeable individual battery cells which are touchingly stacked and clamped to one another in a stack direction, in particular so-called hard case battery cells, wherein on at least one mounting surface of a cell housing of a respective individual battery cell including mounting surfaces that are arranged rectangularly, at least one separate channel web for forming a liquid channel that can be flowed through is arranged. At least one of the respective channel webs is touchingly fixed in a firmly bonded manner to the respective mounting surface by bonding, practically with web adhesive.

Claims

1. A battery device, comprising: a cell stack of rechargeable individual battery cells stacked and clamped to one another in a stack direction, wherein on at least one mounting surface of a cell housing of a respective individual battery cell comprising mounting surfaces arranged rectangularly, at least one separate channel web for forming a liquid channel that can be flowed through is arranged, and wherein at least one of these channel webs is touchingly fixed in a firmly bonded manner to the respective mounting surface by bonding.

2. The device according to claim 1, wherein at least one of these channel webs is at least partially formed by a web adhesive and which in the hardened state of the web adhesive is stable in shape.

3. The device according to claim 1, wherein: the web adhesive forming the respective channel webs originates from the group of the thixotropic adhesives, and/or the web adhesive forming the respective channel webs has thixotropic properties.

4. The device according to claim 1, wherein on at least one mounting surface of the respective cell housing equipped with at least one channel web of web adhesive, at least one spacer is arranged, which beside the respective at least one channel web has a force-supporting effect in the stack direction.

5. The device according to claim 1, wherein at least one filler, in particular glass spheres or glass hollow spheres, is admixed to the respective web adhesive.

6. The device according to claim 1, wherein: at least two separate individual battery cells of the cell stack are indirectly touchingly stacked to one another via a single channel web in the stack direction, the respective channel web forms or delimits at least one liquid channel for conducting liquid, and the respective channel web is fixed on the cell housing of the one respective individual battery cell or on the cell housing of the other respective individual battery cell, and/or flow-active patterns such as winglets and/or V-winglets and/or round and/or oval structures are introduced into the liquid channel.

7. The device according to claim 1, wherein: at least two separate individual battery cells of the cell stack are indirectly touchingly stacked onto one another via two channel webs in the stack direction, these two channel webs jointly form or delimit at least one liquid channel for conducting liquid and the one channel web is fixed on the cell housing of the one respective individual battery cell and the other channel web on the cell housing of the other respective individual battery cell, and/or in the stack direction, between a cell housing of an individual battery cell of the cell stack and an end plate arranged at the front face on the cell stack, at least one liquid channel formed of channel webs for conducting liquid is formed or delimited.

8. The device according to claim 1, wherein: at least two separate individual battery cells of the cell stack are indirectly touchingly stacked to one another via channel webs in the stack direction, the respective channel webs form or delimit at least one liquid channel for conducting liquid, and further channel webs form or delimit at least one collection channel for discharging and supplying liquid from/to at least one respective liquid channel.

9. The device according to claim 6, wherein: at least one liquid channel comprises meandering channel loops, at least one channel loop has meander long arms and an arc-shaped meander short arm connecting these to one another so as to communicate fluidically, the respective meander long arms are oriented transversely with respect to the stack direction, the respective meander short arm is oriented transversely with respect to the stack direction and the meander long arms, and the respective meander short arm extends over maximally 30% of a total length of a meander long arm.

10. The device according to claim 6, wherein: at least one liquid channel and/or at least one collection channel is delimited or bordered transversely with respect to the stack direction by at least one channel web or a pair of channel webs, in order to conduct liquid for cooling or heating the individual battery cells.

11. The device according to claim 1, wherein: at least one mounting surface of the respective cell housing designated as liquid channel mounting surface is oriented perpendicularly or substantially perpendicularly with respect to the stack direction, and the respective cell housing comprises two liquid channel mounting surfaces which are located opposite one another and are oriented parallel to one another.

12. The device according to claim 11, wherein: at least one mounting surface of the respective cell housing designated as collection channel mounting surface is oriented parallel or substantially parallel with respect to the stack direction, and at least one collection channel mounting surface of the respective cell housing is arranged at a right angle with respect to at least one liquid channel mounting surface of the respective cell housing.

13. The device according to claim 12, wherein: channel webs are each arranged on at least one liquid channel mounting surface and on at least one collection channel mounting surface each, the channel webs arranged on the liquid channel mounting surfaces form or delimit liquid channels for conducting liquid and the channel webs arranged on the collection channel mounting surfaces form or delimit collection channels for discharging and supplying liquid from/to at least one of the liquid channels.

14. The device according to claim 1, wherein at least one collection channel for discharging and supplying liquid is connected to at least one liquid channel so as to communicate fluidically.

15. The device according to claim 1, wherein a collection channel is configured as supply channel for supplying liquid to one or all liquid channels and a further collection channel as a discharge channel for discharging liquid from one or all liquid channels.

16. A method for producing a battery device including at least two rechargeable individual battery cells, the method comprising: (1a) Applying an adhesive forming an adhesive bead, in particular a web adhesive from the group of the thixotropic adhesives, to a mounting surface (5) of a first individual battery cell (4,4′) with an application robot or as part of a screen print or as part of a stencil print with guide stencils; or (1b) applying an adhesive enriched with fillers and forming an adhesive bead, in particular a web adhesive from the group of the thixotropic adhesives to a mounting surface of a first individual battery cell with the help of an application robot or as part of a screen print or as part of a stencil print with guide stencils; or (2a) applying an adhesive forming an adhesive bead, in particular a web adhesive from the group of the thixotropic adhesives to a mounting surface of a second individual battery cell with the help of an application robot or as part of a screen print or as part of a stencil print with guide stencils; or (2b) applying an adhesive enriched with fillers and forming an adhesive bead, in particular a web adhesive from the group of the thixotropic adhesives to a mounting surface of a second individual battery cell with the help of an application robot or as part of a screen print or as part of a stencil print with guide stencils; (3) Hardening of the respective adhesives in order to form channel webs that are stable in shape out of the applied adhesive beads; (4) stacking the two individual battery cells to one another in a stack direction, wherein the channel webs of the first individual battery cell each touchingly support themselves on the channel webs of the second individual battery cell, in order to form between the two individual battery cells liquid channels that can be flowed through by liquid for the purpose of individual battery cell temperature control, and/or (5) optionally carrying out an intermediate Step (3a) to be carried out between Step (3) and (4) according to which, following the hardening of the adhesives forming the respective channel webs, a further adhesive is applied to these hardened channel webs and the stacking to one another according to Step (4) then carried out.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The disclosure will now be described with reference to the drawings wherein:

[0040] FIG. 1 shows a perspective view of a battery device according to an exemplary embodiment of the disclosure,

[0041] FIG. 2 shows a perspective view of a first version of an individual battery cell of the battery device shown in FIG. 1 with a view according to an arrow II shown in FIG. 1,

[0042] FIG. 3 shows, in a perspective view, a further version of an individual battery cell,

[0043] FIG. 4 shows a further version of an individual battery cell of the battery device in a greatly simplified, schematic plan view, wherein the channel webs arranged on this individual battery cell form multiple liquid channels that can be flowed through, and

[0044] FIG. 5 shows a further version of an individual battery cell of the battery device in a greatly simplified, schematic plan view, wherein the channel webs arranged on this individual battery cell form multiple liquid channels that can be flowed through.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0045] FIG. 1 shows a perspective view of a battery device designated with 1 as a whole, which comprises at least one cell stack 2 each of a plurality of rechargeable individual battery cells 4,4′,4″. The battery device 1 can form for example a traction battery device for a motor vehicle. The individual battery cells 4,4′,4″ are touchingly stacked to one another in a stack direction 3 indicated in FIG. 1 with an arrow and are non-displaceably clamped against one another both in the stack direction 3 and also transversely thereto. The cell stack 2 of individual battery cells 4,4′,4″ further defines two rectangular stack front faces not designated in more detail which are oriented opposite to one another in the stack direction 3, wherein on each of these stack front faces in principle an end plate designated with the reference number 11 each can be touchingly arranged. Here, merely a single end plate 11 is indicated with dotted line in FIG. 1.

[0046] In FIG. 1, it is noticeable, further, that on at least one planar mounting surface 5 of a cell housing 6 of a respective individual battery cell 4,4′,4″ substantially comprising six mounting surfaces 5 touchingly arranged against one another rectangularly, multiple separate contiguous channel webs 7 are arranged. Exemplarily, all channel webs 7 are touchingly fixed in a firmly bonded manner to the respective mounting surface 5 by bonding with a web adhesive and are each formed entirely of the web adhesive. In FIGS. 1 to 3, the respective web adhesive is shown in a hardened, not flowable state, i.e., stable in shape and following an application operation with an application robot that is not shown.

[0047] Furthermore, it is provided to arrange in the stack direction 3 between at least two adjacent cell housings 6 of two separate individual battery cells 4,4′,4″, at least one liquid channel 10 that can be flowed through for conducting liquid, wherein the channel web 7 or channel webs 7 form or delimit the respective liquid channel 10. This has the effect that between the separate individual battery cells 4,4′,4″ of the cell stack 2 liquid can flow, in particular transversely to the stack direction 3, in order to thus transfer heat energy from the individual battery cells 4,4′,4″ to the liquid, or vice versa. By way of this, the individual battery cells 4,4′,4″ of the cell stack 2 can either be cooled or heated at choice, for example in order to adjust suitable operating parameters of the individual battery cells 4,4′,4″. According to FIG. 1, all separate individual battery cells 4,4′,4″ are exemplarily equipped with channel webs 7 and are each indirectly touchingly stacked by way of two channel webs 7 touchingly supporting one another in the stack direction 3, wherein the channel webs 7 supported on one another form or delimit one or multiple liquid channels 10 for conducting liquid, in order to thereby advantageously cool and/or heat the battery device 1 as desired. Here, the one of the two channel webs 7 is fixed on a mounting surface 5 of a cell housing 6 of the one respective individual battery cell 4,4′ and the other channel web 7 on a mounting surface 5 of a directly adjacent cell housing 6 of the other respective individual battery cell 4,4″.

[0048] In order to reduce the pressure forces acting during the clamping of the individual battery cell 4,4′,4″ in the direction of the stack direction 3 on a respective channel web 7, at least one spacer 9 can be arranged on at least one mounting surface 5 of the respective cell housing 8 equipped with at least one channel web 7 of web adhesive. Such a spacer 9 is exemplarily indicated in FIG. 1 with a dashed line. The spacer or spacers 9 quasi act in a force-assisting manner and beside the channel webs 7 in the stack direction 3 so that pressure forces occurring during the clamping of the individual battery cells 4, 4′, 4″ to form a common cell stack 2 are absorbed both by the channel webs 7 and also by the spacers 9.

[0049] In FIG. 1, it is noticeable, further, that beside the explained channel webs 7 forming or delimiting the liquid channels 10, further channel webs 7 are present in order to form or delimit at least one collection channel 12 for discharging and supplying liquid to at least one of the respective liquid channels 10. By way of this, each liquid channel 10 of the cell stack 2 can be quasi advantageously supplied with liquid with a collection channel 12. Exemplarily, at least one liquid channel 10 and at least one collection channel 12 can be delimited or bordered transversely with respect to the stack direction 3 by a pair of channel webs 7.

[0050] In FIG. 2, a first version of an individual battery cell 4, 4′, 4″ of the battery device 1 according to FIG. 1 with a view according to an arrow II entered in FIG. 1 is noticeable in a perspective view, wherein at least one shown liquid channel 10 has meandering channel loops 13. Each of the channel loops 13 has two meander long arms 14 and an arc-shaped meander short arm 15 connecting these to one another so as to communicate fluidically, wherein the respective meander long arms 14 are oriented transversely with respect to the stack direction 3. With respect to the stack direction 3 and the meander long arms 14, the meander short arm 15 is oriented transversely. As is noticeable, the respective meander short arm 15 extends over minimally 10% and maximally 30% of a total length 16 of a meander long arm 14. Flow-active patterns can be introduced into the liquid channel 10, for example winglets, V-winglets and round or oval structures, all of which serve for increasing the turbulences and/or the heat transfer and/or additionally the improvement of the support surfaces. These are not illustrated in FIG. 2.

[0051] With respect to the liquid channels 10 and collection channels 12 explained above, it still needs to be added that exemplarily each cell housing 6 of an individual battery cell 4, 4′, 4″ comprises at least two mounting surfaces 5 which are referred to as liquid channel mounting surfaces 17 and are located opposite one another, wherein these surfaces are exemplarily oriented perpendicularly with respect to the stack direction 3. Beside these liquid channel mounting surfaces 17 or mounting surfaces 5, each cell housing 6 of an individual battery cell 4, 4′, 4″ exemplarily comprises additionally at least two further mounting surfaces 5 each designated as collection channel mounting surface 18, which, here, are oriented parallel with respect to the stack direction 3 and at a right angle with respect to at least one of a liquid channel mounting surface 17 of the respective cell housing 6, as is noticeable in particular in FIG. 2. Further, multiple channel webs 7 are arranged on each liquid channel mounting surface 17 and in each case on at least one collection channel mounting surface 18, in order to form or delimit on the liquid channel mounting surfaces 17 the mentioned liquid channels 10 for conducting liquid, and in order to form or delimit on the collection channel mounting surface 18 or collection channel mounting surfaces 18 collection channels 12 for discharging and supplying liquid to at least one of the liquid channels 10. Here, the collection channels 12 can be practically flowed through by liquid longitudinally with respect to the stack direction 3. For temperature-controlling the battery device 1 it is provided that exemplarily all collection channels 12 are connected to all liquid channels 10 so as to communicate fluidically in order to supply the liquid channels 10 with liquid and in order to quasi-state a liquid system that can be flowed through by liquid, with which the battery device 1 can be cooled and/or heated as desired.

[0052] It has proved itself in practice to form at least one collection channel 12 as supply channel 19 for supplying liquid to one or all liquid channels 10 and a further collection channel 12 as discharge channel 20 for discharging liquid from one or all liquid channels 10, see FIG. 2. One can imagine for example to connect a supply line to the supply channel 19 and a discharge line to the discharge channel 20 so that liquid during the operation of the battery device 1 can, initially emanating from the supply line, flow through the supply channel 19 to the liquid channels 10. After the liquid has flowed through there quasi in a heat energy-transferring manner through the meandering channel loops 13 of the respective liquid channels 10, it can, downstream, enter the discharge channel 20 and the discharge line in order to flow out there. The practical work with the battery device 1 can thus be favored.

[0053] FIG. 3 shows in a perspective view a further version of an individual battery cell 4, 4′, 4″, which can be exemplarily incorporated in a cell stack 2 of a battery device 1 according to the above description. In contrast with the individual battery cells 4, 4′, 4″ according to the first version in accordance with the above description, the individual battery cells 4, 4′, 4″ are each equipped merely with multiple liquid channels 10 arranged on the respective cell housing 6 according to the further version according to FIG. 3, while collection channels 12 have been omitted. In this liquid channel 10, flow-active patterns can also be introduced which are not shown in FIG. 3, for example winglets, V-winglets and round or oval structures, which altogether serve for increasing the turbulences and/or the heat transfer and/or additionally for the improvement of the support surfaces.

[0054] FIG. 4 shows a further version of an individual battery cell 4, 4′, 4″ of the battery device 1 in a highly simplified, schematic plan view, wherein the channel webs 7 arranged on this individual battery cell 4, 4′, 4″ form multiple liquid channels 10 that can be flowed through, which are configured branched and parallel to one another at least in portions. It is noticeable, furthermore, that the liquid channels 10 have a common inflow 21 and a common outflow 22 which on the individual battery cell 4, 4′, 4″ are arranged opposite one another, i.e., the liquid flowing through the liquid channels 10 flows quasi from “the left” into the liquid channels 10 and “on the right” out of the same. Practically, two to six of such parallel liquid channels 10 are provided.

[0055] FIG. 5 shows, like FIG. 4, multiple liquid channels 10 that are parallel to one another, whose common inflow 21 and common outflow 22 are arranged on the individual battery cell 4, 4′, 4″ opposite one another. In contrast with the inflow 21 and outflow 22 illustrated in FIG. 4, it is provided here however that the inflow 21 and outflow 22 are arranged on the individual battery cell 4, 4′, 4″ diagonally opposite one another, i.e., so that the liquid flowing through the liquid channels 10 quasi flows from “the top left” into the liquid channels 10 and “at the bottom right” out of the same.

[0056] The liquid channels 10 shown in FIGS. 4 and 5 can form a bionic channel arrangement. Here it is possible that the flow direction of the liquid flowing into the liquid channel 10, in particular, at the inflow 21, is either equal to or opposite to the flow direction of the liquid flowing out of this liquid channel 10, in particular at the outflow 22.

[0057] It is understood that the foregoing description is that of the exemplary embodiments of the disclosure and that various changes and modifications may be made thereto without departing from the spirit and scope of the disclosure as defined in the appended claims.