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A battery separator and its preparation method, a power battery and its preparation method

A technology of power battery and manufacturing method, which is applied to secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve problems such as safety accidents, easy deformation of batteries, and impact on battery cycle life. , to prevent excessive stress concentration, improve cycle life and safety performance, improve cycle life and safety performance

Active Publication Date: 2021-11-30
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the battery internal separator products on the market usually use dot-shaped coating separators, in which the dot-coated coating with adhesiveness and compressibility is consistent with the interface between the cathode and first electrode of the lithium-ion battery. properties and electrolyte wettability have been improved, however, the current dot-coated separators usually adopt a continuous and regular arrangement, such as Figure 1~2 As shown in , in the case where the multilayer anode sheet 1', cathode sheet 2' and separator 3' overlap in a lithium-ion battery, the dot-shaped protrusions 0' between different coatings overlap on the same straight line, which will lead to The stress concentration in the local area of ​​the battery makes the battery prone to deformation during the cycle charge and discharge process, which affects the cycle life of the battery, and may cause serious local lithium precipitation in severe cases, causing safety accidents

Method used

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  • A battery separator and its preparation method, a power battery and its preparation method
  • A battery separator and its preparation method, a power battery and its preparation method
  • A battery separator and its preparation method, a power battery and its preparation method

Examples

Experimental program
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Embodiment 1

[0041] Such as Figure 3-4 As shown, a battery diaphragm is used to isolate the first pole piece 1 and the second pole piece 2. The diaphragm includes a diaphragm base 3 and a plurality of protrusions 0 arranged on at least one side of the diaphragm base 3. The plurality of protrusions 0 are in the form of Arranged in an array, and the direction of the overall array forms an angle α with the length direction of the diaphragm base 3, angle α=arcsin[h / (n×l)], where h is the first adjacent to the protrusion 0 The height of the pole piece 1 or the second pole piece 2, n is the number of protrusions 0 in the height direction, and l is the total length of the first pole piece 1 or the second pole piece 2 adjacent to the protrusions 0. In the solution of the present invention, by tilting the direction of the protrusion O array at a special angle, the protrusion O is placed in the thickness direction of the cell 4 composed of the first pole piece 1, the second pole piece 2 and the bat...

Embodiment 2

[0046] A method for preparing a battery separator, comprising the following steps:

[0047] Step a, calculate the rotation angle, calculate the value of the angle α according to the formula α=arcsin[h / (n×l)], wherein, h is the first pole piece 1 or the second pole piece 2 adjacent to the protrusion 0 The height of n is the number of raised poles in the height direction, and l is the total length of the first pole piece 1 or the second pole piece 2 adjacent to the raised pole;

[0048] Step b, adjusting the coating direction, using the longitudinal direction of the diaphragm substrate 3 as a reference, rotating the coating direction of the coating device by an angle α;

[0049] Step c, coating, after the angle of the coating device is adjusted, coating is performed on the separator base 3 to obtain a battery separator.

[0050] Preferably, the coating method in step c is gravure coating. The use of gravure coating can ensure the uniformity of the protrusions in the printing p...

Embodiment 3

[0053] Such as Figure 3-4 As shown, a power battery includes a first pole piece 1, a second pole piece 2 and a battery cell 4 formed by winding or laminating a separator, wherein the separator is the battery separator in Example 1. Preferably, the protrusions 0 are all dislocated in the thickness direction of the electric core 4 .

[0054] It should be noted that, in this embodiment, the protrusions 0 are dislocated in the thickness direction of the electric core 4 , which means that the projection planes of the protrusions in the thickness direction of the electric core 4 do not overlap. Therefore, in the thickness direction of the battery cell 4, the protrusions between the layers will form a certain expansion space, especially when the battery is continuously cycled during the expansion of the pole piece, it can play a certain buffer. The function makes the internal expansion force of the battery uniform, thereby preventing the excessive concentration of the internal stre...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a battery diaphragm for isolating a first pole piece and a second pole piece. The protrusions are arranged in an array, and an angle α is formed between the overall array direction and the length direction of the diaphragm base, and the α=arcsin[h / (n×l)]. Compared with the prior art, the present invention inclines the direction of the protrusion array at a special angle, so that the protrusions can form a dislocation arrangement in the thickness direction of the cell composed of the first pole piece, the second pole piece and the diaphragm , thereby avoiding the problem of bump overlap in this direction, achieving the purpose of dispersing the internal stress of the battery cell, and significantly improving the cycle life and safety performance of the battery. In addition, the invention also discloses the preparation method of the battery separator, the power battery and the preparation method of the power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a battery diaphragm and a preparation method thereof, a power battery and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries are widely used in various industries because of their advantages such as high working voltage, high energy density, long cycle life, and small self-discharge. Among them, lithium-ion batteries used in electric motorcycles and electric vehicles are power batteries. [0003] In the structure of lithium-ion power batteries, the separator is one of the key inner components, which is used to separate the positive and negative electrodes of the battery, prevent the positive and negative electrodes from being short-circuited, and at the same time allow the ions in the electrolyte to freely move between the positive and negative electrodes. pass. Therefore, the performance of the separator determines the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/463H01M50/403H01M10/0525H01M10/0587H01M10/0585
CPCH01M10/0525H01M10/0585H01M10/0587H01M50/403H01M50/463Y02E60/10Y02P70/50
Inventor 陈圣立廉俊杰朱建平邹武元
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD