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Core structure of lithium battery and assembling method of core structure

A lithium battery and core technology, which is applied in the core structure and assembly field of lithium batteries, can solve the problems of burrs on the edge of pole pieces, affecting the performance of lithium batteries, and low qualified rate of finished products, so as to reduce burrs, save production costs, The effect of high product qualification rate

Active Publication Date: 2015-01-14
INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium battery core includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. At present, the common lithium battery core structures include winding type and stacked sheet type. The winding type core refers to the The positive electrode sheet, the separator and the negative electrode sheet form a wound body according to the winding method. The laminated core is obtained by stacking the positive electrode sheet, separator and negative electrode sheet. Compared with the wound core structure, the laminated core body The structure has the advantages of high pole piece capacity, low internal resistance, high rate performance, and many applicable shapes, and has more advantages in terms of performance. However, in the prior art, the stacked core structure needs to separate the pole piece, and each piece The pole piece must form a tab area, the production is more complicated, the qualified rate of the finished product is low, and in the process of slicing the pole piece, no matter whether it is mechanical cutting (blade, etc.) or energy cutting (laser, etc.), It is easy to produce burrs on the edge of the pole piece, which seriously affects the performance of the lithium battery

Method used

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  • Core structure of lithium battery and assembling method of core structure
  • Core structure of lithium battery and assembling method of core structure
  • Core structure of lithium battery and assembling method of core structure

Examples

Experimental program
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Effect test

Embodiment 1

[0051] like Figure 1-5 As shown, the core structure of the lithium battery of the present invention includes a positive electrode sheet 1, a negative electrode sheet 2, a separator 3, an outer positive electrode ear and an outer negative electrode ear, and the positive electrode sheet 1 includes a first substrate 10, a first insulating material layer 11 and the positive polar material layer 12, the first insulating material layer 11 and the positive polar material layer 12 are all coated on one surface of the first substrate 10, and the first substrate 10 also has a reserved positive tab region 101, wherein, The first insulating material layer 11, the positive polarity material layer 12, the reserved positive tab area 101, and the positive polarity material layer 12 are arranged repeatedly in sequence, and the negative electrode sheet 2 includes a second substrate 20, a second insulating material layer 21 and a negative polarity material layer 22. Both the second insulating m...

Embodiment 2

[0055] The only difference between this embodiment and embodiment 1 is: as Figure 6-7 As shown, the width of the first substrate 10 at the reserved positive tab region 101 and the width of the first substrate 10 at the first insulating material layer 11 are respectively smaller than the width of the first substrate 10 at other positions (for example, at The width of the first substrate 10 at the positive polar material layer 12), the width of the second substrate 20 at the reserved negative tab region 201 and the width of the second substrate 20 at the second insulating material layer 21 are respectively smaller than those at other The width of the second substrate 20 at the site (for example, the width of the second substrate 20 at the negative polarity material layer 22).

Embodiment 3

[0057] like Figure 8-17As shown, the core structure of the lithium battery of the present invention includes a positive electrode sheet 4, a negative electrode sheet 5, a separator 6, an outer positive electrode ear and an outer negative electrode ear. The positive electrode sheet 4 includes a first substrate 40 and a plurality of electrodes extending to the first substrate. The positive tab 43 outside the sheet 40 is repeatedly coated with a first insulating material layer 41 and a positive polar material layer 42 on one surface of the first substrate 40, and each positive tab 43 is connected to each positive polar material layer 42 respectively. They are all connected to the outer positive tabs. The negative electrode sheet 5 includes a second substrate 50 and a plurality of negative tabs 53 extending outside the second substrate 50. One surface of the second substrate 50 is repeatedly coated with a second insulating layer in sequence. The material layer 51 and the negative...

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Abstract

The invention discloses a core structure of a lithium battery and an assembling method of the core structure. The core structure of the lithium battery comprises a positive plate, a negative plate and an isolation membrane, wherein the positive plate and the negative plate are single-face coated plates and are continuously folded to form an E shape, the isolation membrane is continuously folded to form a W-shaped structure, the positive plate and the negative plate are respectively inserted from two sides of the isolating membrane so that the isolating membrane is arranged between positive polarity material layers on the positive plate and negative polarity material layers on the negative plate, the positive polarity material layers are connected with positive tabs or preserved positive tab regions, and the negative polarity material layers are connected with negative tabs and preserved negative tab regions; the positive tabs and the negative tabs or the preserved positive tab regions and the preserved negative tab regions on the positive plate and the negative plate are all arranged at the external end of the whole structure so as to be conveniently connected with external tabs; first insulating material layers or second insulating material layers are further arranged at the turning points of the positive plate and the negative plate to effectively prevent the generation of burrs in folding. The core structure disclosed by the invention has the advantage of a laminated core structure and is free from cutting, a large-power cutting device is omitted, the possibility of generating the burrs can be effectively reduced, and the product quality is improved.

Description

technical field [0001] The invention mainly relates to the field of manufacturing lithium batteries, in particular to a core structure and an assembly method of the lithium battery. Background technique [0002] Making the battery core is the core process of the lithium-ion battery assembly process, and the quality of this process plays a decisive role in the quality and safety of the battery. The lithium battery core includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. At present, the common lithium battery core structures include winding type and stacked sheet type. The winding type core refers to the The positive electrode sheet, the separator and the negative electrode sheet form a wound body according to the winding method. The laminated core is obtained by stacking the positive electrode sheet, separator and negative electrode sheet. Compared with the wound core structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/0583Y02E60/10Y02P70/50
Inventor 丁桦杨岩岳昊
Owner INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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