PRIMARY LITHIUM BATTERY HAVING HIGH DISCHARGE EFFICIENCY

Abstract

A primary lithium battery having high discharge efficiency, having a positive electrode plate, a separator, a lithium best negative electrode plate, and electrode tabs disposed on the positive electrode plate and the lithium belt negative electrode plate respectively; the positive electrode plate, the separator, and the lithium belt negative electrode plate are mutually wound together as a winding, wherein an end of the electrode tab of the positive electrode plate is used as a starting end of the winding; at a tad end of the winding, a reaction inhibiting region is provided on the lithium belt negative electrode plate; a polymer plastic tape is provided on the reaction inhibiting region; a groove is provided between the electrode tab of the lithium belt negative electrode plate and the polymer plastic tape to stop reaction.

Claims

1: A primary lithium battery comprising a positive electrode plate, a separator, a lithium belt negative electrode plate, and electrode tabs disposed on the positive electrode plate and the lithium belt negative electrode plate respectively; the positive electrode plate, the separator, and the lithium belt negative electrode plate are mutually wound together as a winding, wherein an end of the electrode tab of the positive electrode plate is used as a starting end of the winding; at a tail end of the winding, a reaction inhibiting region is provided on the lithium belt negative electrode plate; a polymer plastic tape is provided on the reaction inhibiting region; a groove is provided between the electrode tab of the lithium belt negative electrode plate and the polymer plastic tape.

2: The primary lithium battery of claim 1, wherein the polymer plastic tape is any one of a polyimide tape, a polyolefin tape, a polyester tape, and a polyfluoro tape.

3: The primary lithium battery of claim 2, wherein an acrylic glue layer or a silica gel layer is provided between the polymer plastic tape and the lithium belt negative electrode plate.

4: The primary lithium battery of claim 3, wherein a width of the polymer plastic tape is 10% to 35% of a width of the lithium belt negative electrode plate; a length of the polymer plastic tape is 10% to 20% of a length of the lithium belt negative electrode plate.

5: The primary lithium battery of claim 1, wherein a depth of the groove is 40% to 90% of a thickness of the entire lithium belt negative electrode plate.

6: The primary lithium battery of claim 5, wherein a width of the groove is 0.1% to 7% of a length of the entire lithium belt negative electrode plate.

7: The primary lithium battery of claim 6, wherein a length of the groove is the same as or narrower than a width of the lithium belt negative electrode plate.

8. (canceled)

9. (canceled)

10. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a comparative example 1 according to prior art, showing the structural view where the lithium belt negative electrode plate is unfolded.

[0010] FIG. 2 is a structural view showing the relative positions of the positive electrode plate and the lithium belt negative electrode plate (also configured with the polymer plastic tape and the groove) unfolded according to embodiments 1, 2 and 3 of the present invention.

[0011] FIG. 3 is a structural view showing the relative positions of the positive electrode plate and the lithium belt negative electrode plate (also configured with the polymer plastic tape) unfolded according to a comparative example 2.

[0012] In the figures, 1 is positive electrode plate, 2 is lithium belt negative electrode plate, 3 are electrode tabs, 4 is polymer plastic tape, and 5 is groove.

DETAILED DESCRIPTION OF THE INVENTION

[0013] In order that a person skilled in the art can have a better understanding of the technical solutions provided by the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying figures.

Embodiment 1

[0014] As shown in FIG. 2, a primary lithium battery having high discharge efficiency comprises a positive electrode plate 1, a separator, a lithium belt negative electrode plate 2, and electrode tabs 3 disposed on the positive electrode plate and the lithium belt negative electrode plate respectively; the positive electrode plate 1, the separator, and the lithium belt negative electrode plate 2 are mutually wound together as a winding, wherein an end of the electrode tab of the positive electrode plate is used as a starting end of the winding; at a tail end of the winding, a reaction inhibiting region is provided on the lithium belt negative electrode plate 2; a polymer plastic tape 4 is provided on the reaction inhibiting region; a groove 5 is provided between the electrode tab 3 of the lithium belt negative electrode plate 2 and the polymer plastic tape 4 to stop reaction. The positive electrode plate is made according to the following steps: weighing 1843 g of heat-processed electrolytic manganese dioxide, 37 g of graphite, 120 g of conductive carbon black, and 72 g of polytetrafluoroethylene solution; stirring the above ingredients evenly in deionized water to obtain a mixture, coating the mixture on a 0.3 mm aluminum mesh; drying and laminating the aluminum mesh; cutting the aluminum mesh and welding an electrode tab to the aluminum mesh to form the positive electrode plate 1 as shown in FIG. 2. Lengthwidth of the polymer plastic tape 4 is 35 mm6 mm, and lengthwidth of the lithium belt negative electrode plate 2 is 240 mm25 mm. A length of the groove is 25 mm, and a depth of the groove 5 is 40% to 90% of a thickness of the entire lithium belt negative electrode plate. A width of the groove 5 is 0.1% to 7% of the length of the entire lithium belt negative electrode plate.

Embodiment 2

[0015] The positive electrode plate 1 is made according to the method in embodiment 1. According to the positions indicated in FIG. 2, lengthwidth of the polymer plastic tape 4 is 25 mm4 mm. Lengthwidth of the lithium belt negative electrode plate is 240 mm25 mm. Length of the groove is 25 mm. Depth of the groove is 40% to 90% of a thickness of the entire lithium belt negative electrode plate. Width of the groove 5 is 0.1% to 7% of the length of the entire lithium belt negative electrode plate.

Embodiment 3

[0016] The positive electrode plate 1 is made according to the method in embodiment 1. According to the positions indicated in FIG. 2, lengthwidth of the polymer plastic tape 4 is 30 mm8 mm. Lengthwidth of the lithium belt negative electrode plate is 240 mm25 mm. Length of the groove is 25 mm. Depth of the groove is 40% to 90% of a thickness of the entire lithium belt negative electrode plate. Width of the groove 5 is 0.1% to 7% of the length of the entire lithium belt negative electrode plate.

Comparative Example 1

[0017] A LiMn battery, comprising a positive electrode plate 1, a lithium belt negative electrode plate 2 and an electrode tab 3 provided on the positive electrode plate. The positive electrode plate and the lithium negative electrode plate are wound together to form a winding. The lithium belt negative electrode plate unfolded according to this comparative example 1 is shown in FIG. 1. The lithium belt negative electrode plate does not have reaction inhibiting region or groove that stops reaction.

Comparative Example 2

[0018] A reaction inhibiting region is provided on the lithium belt negative electrode plate. A polymer plastic tape 4 is adhered to the reaction inhibiting region. However, groove 5 that stops reaction is not provided on the lithium belt negative electrode plate. The comparative example 2 is shown in FIG. 3.

[0019] The lithium belt negative electrode plates according to embodiments 1, 2, 3 and comparative examples 1 and 2 are each being used to make a respective cylindrical primary LiMn battery.

[0020] Tables 1 and 2 below show some experimental results of the embodiments and the comparative examples.

TABLE-US-00001 TABLE 1 Comparison of battery capacities of CR17345 cylindrical LiMn batteries 20 mA discharge capacity AVE MIN Uniformity Experiment (mAh) (mAh) (%) Result Embodiment 1 1543 1481 91.64 Higher average Embodiment 2 1523 1481 95.14 discharge capacity, Embodiment 3 1518 1478 94.66 good uniformity Comparative 1483 1379 88.74 At later stage, example 1 some parts of the battery lithium belt broken; lower average discharge capacity; poor uniformity Comparative 1518 1478 94.66 Higher average example 2 discharge capacity, good uniformity

TABLE-US-00002 TABLE 2 Comparison of battery safety of CR17345 cylindrical LiMn batteries Discharge Discharge Forced 50% over- 70% over- Experiment discharge loaded loaded Result Embodiment 1 Pass Pass Pass Section the lithium belt negative electrode plate, and it is broken at the groove Embodiment 2 Pass Pass Pass Section the lithium belt negative electrode plate, and it is broken at the groove Embodiment 3 Pass Pass Pass Section tire lithium belt negative electrode plate. and it is broken at the groove Comparative Pass Pass Pass Section the example 1 battery, and the inner lithium belt is broken at a position corresponding to a tail part of the positive electrode Comparative Fail Fail Fail Battery burnt example 2 inside, analysis cannot he made

[0021] According to the present invention, the lithium belt negative electrode plate is provided with a reaction inhibiting region, and a polymer plastic tape 4 is provided on the reaction inhibiting region; a groove 5 is provided between the electrode tab 3 of the lithium belt negative electrode plate 2 and the polymer plastic tape 4 to stop reaction. The reaction inhibiting region according to the above configuration can ensure effective and sufficient battery discharge. The groove that stops reaction can ensure that the lithium belt is broken under overloaded battery discharge and forced battery discharge, thereby ensuring battery safety. The primary lithium battery according to the present invention is safe and has high discharge capacity.

[0022] In the above embodiments 1, 2 and 3, the material making the positive electrode can also be iron disulfide, and the same technical effect can be achieved.

[0023] The preferred embodiments of the present invention are described above. Any obvious changes and replacements without deviating from the inventive concept of the present invention should fall within the scope of protection of the present invention.