Battery module case and battery module comprising the same

Abstract

The present application can provide a battery module case applicable to an automation process, a battery module comprising the same, a battery pack comprising such a battery module and an automobile comprising such a battery module or pack. The present application can provide a battery module at low cost by applying an automation process.

Claims

1. A battery module case, comprising: a bottom plate and a sidewall, the bottom plate and the sidewall together forming an inner space configured to receive a resin layer and a plurality of battery cells; a control hole and an injection hole formed in the bottom plate or the sidewall; and a light transmissive film located on the control hole, wherein the light transmissive film comprises a base material and an adhesive layer formed on the base material, wherein the light transmissive film is located on the control hole, and the light transmissive film is not located on the injection hole.

2. The battery module case according to claim 1, wherein the injection hole is configured to receive an injection of a resin composition therethrough, and wherein the battery module case further comprises the resin layer, the resin layer being formed from the resin composition.

3. The battery module case according to claim 1, wherein the bottom plate or the sidewall has a thermally conductive region at a portion thereof, the thermally conductive region being in contact with the resin layer.

4. The battery module case according to claim 1, wherein the control hole is formed in the bottom plate.

5. The battery module case according to claim 1, wherein a position of the control hole satisfies Equation 1 below:
1/50≤P=B/L≤1/2   [Equation 1] wherein, P represents the position of the control hole formed in the bottom plate or the sidewall, L represents a total length of the bottom plate or the sidewall measured from one end surface of the bottom plate or the sidewall to an opposite end surface, and B represents a distance from the one end surface to the control hole.

6. The battery module case according to claim 1, wherein the control hole is one of a plurality of control holes, and the light transmissive film is formed extending along a direction in which the plurality of control holes are arranged.

7. The battery module case according to claim 1, wherein the adhesive layer is disposed only in a partial region of the base material and not in a remaining region of the base material.

8. The battery module case according to claim 7, wherein the partial region of the base material in which the adhesive layer is disposed and the remaining region of the base material in which the adhesive layer is not disposed are bent relative to one another at a predetermined angle, and the partial region of the base material and the remaining region of the base material have different optical characteristics.

9. The battery module case according to claim 1, wherein all of the base material or the partial region of the base material comprises an absorbent component that is configured to absorb light of any wavelength.

10. The battery module case according to claim 1, wherein an antireflection film is disposed on the all of the base material or the partial region of the base material.

11. A battery module, comprising: a battery module case including a bottom plate and a sidewall, the bottom plate and the sidewall together forming an inner space, a control hole and an injection hole formed in the bottom plate or the sidewall; a light transmissive film located on the control hole; a plurality of battery cells disposed in the inner space of the battery module case; and a resin layer disposed in the inner space of the battery module case, wherein the resin layer is in contact with at least one of the plurality of battery cells and the bottom plate or the sidewall, wherein the light transmissive film is distinct from the resin layer, and wherein the light transmissive film is located on the control hole, and the light transmissive film is not located on the injection hole.

12. The battery module according to claim 11, wherein the injection hole is configured to receive injection of a resin composition therethrough, the resin layer being formed from the resin composition.

13. The battery module according to claim 11, wherein the light transmissive film comprises a base material and an adhesive layer formed on the base material.

14. The battery module according to claim 11, wherein a surface of at least one of the battery cells comprises an absorbent component that is configured to absorb light of any wavelength.

15. The battery module according to claim 11, wherein the resin layer has thermal conductivity of 1.5 W/mK or more.

16. The battery module according to claim 11, wherein the resin layer comprises a filler.

17. A battery pack comprising two or more battery modules each according to claim 11, the battery modules being electrically connected to each other.

18. An automobile comprising the battery module according to claim 11.

19. An automobile comprising the battery pack of claim 17.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a perspective view showing an exemplary battery module case of the present application.

(2) FIG. 2 is a sectional view of an exemplary battery module case that an injection hole, control holes and a light transmissive film are formed on a bottom plate.

(3) FIG. 3 is a plan view of an exemplary bottom plate in which injection holes and control holes are formed.

(4) FIG. 4 is a sectional view showing a light transmissive film having a detection means.

(5) FIG. 5 is a sectional view showing an exemplary light transmissive film that an absorbent component that absorbs light is included in a base material.

(6) FIG. 6 is a sectional view showing another exemplary light transmissive film that an antireflection film is formed on a base material.

(7) FIGS. 7 and 8 are perspective views showing an exemplary battery pouch that can be used as a battery cell.

(8) FIG. 9 is a sectional view showing a structure of an exemplary battery module.

MODE FOR INVENTION

(9) Hereinafter, Example and Comparative Examples will be described, but the scope of the present application is not limited by the range shown below.

(10) Evaluation Method

(11) Processability

(12) A case where the injection amount of the resin composition injected into the battery module case could not be confirmed from the outside or a case where the resin composition injected into the battery module case was discharged through the control hole was evaluated that the processability suitable for an automation process was not ensured.

(13) <Evaluation Results>

(14) O: if it is suitable for automation process application

(15) X: if it is not suitable for automation process application

EXAMPLE

(16) A plurality of battery cells were accommodated in a battery module case that an injection hole and a control hole were formed in a bottom plate and a light transmissive film was attached to the control hole. After attaching the light transmissive film, a resin composition was injected into the battery module case through the injection hole.

Comparative Example 1

(17) A plurality of battery cells were accommodated in a battery module case that an injection hole was formed in a bottom plate and a resin composition was injected into the battery module case through the injection hole.

Comparative Example 2

(18) A plurality of battery cells were accommodated in a battery module case that an injection hole and a control hole were formed in a bottom plate and a resin composition was injected into the battery module case through the injection hole.

(19) TABLE-US-00001 TABLE 1 Processability Checking Reverse-discharge injection amount of resin composition Example ◯ X Comparative Example 1 X X Comparative Example 2 ◯ ◯

(20) It can be confirmed from Table 1 above that the battery module case is suitable for the automation process of the battery module. Specifically, when a battery module is manufactured by applying the battery module case to which the light transmissive film of the embodiment is applied, the injection amount of the resin composition can be easily confirmed, and the resin composition can also be prevented from being reversely discharged through the control hole.

(21) Meanwhile, in Comparative Example 1, since no control hole was formed, the injection amount of the resin composition could not be confirmed, and in Comparative Example 2, the injection amount of the resin composition could be confirmed through the control holes, but it was difficult to be easily determined and the resin composition was also discharged through the control holes. Therefore, it can be confirmed that Comparative Example 1 and Comparative Example 2 are inadequate for the automation process application.