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A cylindrical lithium primary battery and its preparation method

A cylindrical, battery technology, applied in the direction of electrodes of primary batteries, non-aqueous electrolyte batteries, electrode carriers/current collectors, etc., can solve the problems of rupture of positive and negative plates, irresistible tensile strength, and reduced battery capacity, etc. Achieve the effect of avoiding breakage, significant production practical significance, and reducing production costs

Active Publication Date: 2018-11-13
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this type of battery is prepared into a cylindrical lithium primary battery, the positive and negative plates are prone to breakage after charging, resulting in battery failure.
The reason is that during the process of lithium deposition on the surface of the current collector, the current collector, which was originally only a dozen microns, continues to thicken to tens of microns, and its volume expands by 2 to 10 times, forming a large expansion inside the battery. Stress, limited by the shell, the stress cannot be released, and the tensile strength of the pole piece itself cannot resist such a large stress, which eventually leads to the pole piece being pulled off, which significantly reduces the capacity of the battery and even causes the battery to fail
[0005] However, there is currently no technology that can effectively avoid the positive and negative electrode sheets of the battery from breaking when the positive and negative electrode sheets are tightly wound in the preparation of the cylindrical new lithium battery, improve the performance of the battery and the production pass rate, and then reduce the The overall production cost of the battery

Method used

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  • A cylindrical lithium primary battery and its preparation method
  • A cylindrical lithium primary battery and its preparation method
  • A cylindrical lithium primary battery and its preparation method

Examples

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preparation example Construction

[0078] In order to prepare the above-mentioned cylindrical lithium primary battery provided by the present invention, see Figure 4 , the present invention also provides a method for preparing a cylindrical lithium primary battery, the method comprising the following steps:

[0079] The first step is to make the positive electrode sheet: apply the positive electrode slurry evenly on the surface of the positive electrode collector, and then go through the rolling, shearing, and dust removal processes in sequence, and weld the positive electrode lugs to obtain the positive electrode sheet;

[0080] The second step is to make the negative electrode sheet: cut the metal foil as the negative electrode collector into a preset length and width, and then weld the negative electrode tab to obtain the negative electrode sheet;

[0081] The third step is to make the battery electrode group: wind the positive electrode sheet, separator, and negative electrode sheet together, and end with ...

Embodiment 1

[0097] The lithium primary battery provided by the present invention can be prepared by the following method:

[0098] 1. Making the positive electrode sheet: lithium cobalt oxide (LiCoO 2 ) is the positive electrode active material, mixed with the conductive agent Super-P and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 95.5:2:2.5, using polypyrrolidone (NMP) as a solvent to make a positive electrode slurry; with a thickness of 15 μm The aluminum foil is the positive electrode current collector 6, and the positive electrode slurry is 12.5 mg / cm on one side 2 The coating amount is evenly coated on both sides of the aluminum foil, and is coated in two stages to form two sections of positive electrode coating 10, the length of the two sections of positive electrode coating 10 is 720mm, and the two sections of coating interval are 15mm; The coating length is the same, but the starting position of the slurry coating on both sides is 5mm different, and then process...

Embodiment 2

[0107] The lithium primary battery provided by the present invention can be prepared by the following method:

[0108] 1. Making the positive electrode sheet: lithium cobalt oxide (LiCoO 2 ) is the positive electrode active material, mixed with the conductive agent Super-P and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 95.5:2:2.5, using polypyrrolidone (NMP) as a solvent to make a positive electrode slurry; with a thickness of 15 μm The aluminum foil is the positive electrode current collector 6, and the positive electrode slurry is uniformly coated on both sides of the aluminum foil with a coating amount of 12.5 mg / cm2 on one side to form two sections of positive electrode coating 10. The lengths of the two sections of positive electrode coating 10 are respectively 1460mm, 1400mm, two sections of positive electrode coating with 10 layers dislocated by 5mm and 55mm respectively, one end of the dislocation of 5mm is wound first, and processed by rolling and sh...

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Abstract

The invention discloses a cylindrical primary lithium battery, which comprises a hollow housing (2), wherein a battery pole group (1) is placed into the housing (2); the top part of the battery pole group (1) is connected with a head cover (3); a non-aqueous electrolyte is injected into the housing (2); the battery pole group (1) comprises a positive pole piece (5), a negative pole piece (20) and a membrane (4); the membrane (4) is located between the positive pole piece (5) and the negative pole piece (20); the battery pole group (1) is the pole group formed by winding the positive pole piece (5), the negative pole piece (20) and the membrane (4) and ended at the negative pole piece; and the battery pole group (1) is pasted with a terminating adhesive tape (9) at the end of the negative pole piece (20). The invention further discloses a preparation method of the cylindrical primary lithium battery. By the cylindrical primary lithium battery, fractures of the positive pole piece and the negative pole piece of the battery can be effectively avoided; the battery performance and the production yield are improved; and the production cost of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of primary battery manufacturing, in particular to a cylindrical lithium primary battery and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have the incomparable advantages of other energy storage batteries, such as high energy density, light weight, and good safety performance. It has also been widely used in bicycles and electric vehicles, and it is also very attractive for military fields such as aerospace, aviation, and field operations. [0003] However, the current lithium-ion battery has a high self-discharge rate, that is, a poor storage charge capacity, with a typical monthly capacity loss of 5%. Compared with lithium-ion batteries, the monthly capacity loss of lithium-ion batteries generally does not exceed 0.1%, but the rate performance of lithium-ion batteries is worse than that of lithium-ion batteries. Even for power-type lithium-ion batteries, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/14H01M4/08H01M4/64
CPCH01M4/08H01M4/64H01M6/14
Inventor 阳晓霞冯辉杜建平贾宏涛
Owner TIANJIN LISHEN BATTERY