Battery cell, battery module and battery pack

A battery cell and winding core technology, applied in secondary batteries, electrode carriers/collectors, circuits, etc., can solve the problems of easy short circuit of the battery cell, thermal runaway of the battery cell, etc.

Pending Publication Date: 2022-08-05
南京正力新能电池技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper foil and aluminum foil have excellent electrical conductivity, but when the battery is damaged by acupuncture,

Method used

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  • Battery cell, battery module and battery pack
  • Battery cell, battery module and battery pack
  • Battery cell, battery module and battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11

[0064] Embodiments 1-11 respectively provide 11 kinds of cells (batteries 1-11), the thickness A of the insulating support layer 601 of the 11 kinds of cells, the thickness B of the conductive layer 603 corresponding to each insulating support layer 601, and the thickness B of each insulating support layer 601. The thickness C of the isolation film corresponding to the insulating support layer 601, the thickness D of the winding core 605, and the ratio F of the cell capacity of the cell to the surface area of ​​the cell satisfy 10≤A*C*(F / 10 7 ) / (B*D / 1000)*10 7 The relationship between the five of ≤30000 is shown in Table 1. At the same time, the insulating support layers 601 of the positive current collectors and negative current collectors of the 11 cells are made of PET, the conductive layer 603 of the positive current collectors is made of aluminum foil, and the conductive layer 603 of the negative electrode current collectors is made of copper foil. The thickness of the p...

experiment example 1

[0073] The 11 kinds of cells provided in Example 1-11 and the 5 kinds of cells provided in Comparative Examples 1-5 were subjected to acupuncture experiments according to the procedures in the national standard GBT31485. The test conditions were: 25±5°C, fully charged to 4.2V, A 3mm steel needle was inserted into the explosion-proof valve of the battery cell (with a clamp) at a speed of 25mm / s. The experimental results after 1h of observation are shown in Table 3.

[0074] Table 3. Acupuncture experimental data of cells

[0075]

[0076]

[0077] According to the data tested in Table 3, compared with Comparative Examples 1-5, the thickness A of the insulating support layer 601 and the thickness of the conductive layer 603 corresponding to each insulating support layer 601 in Examples 1-11 of the present invention B. The thickness C of the isolation film corresponding to each insulating support layer 601, the thickness D of the winding core 605, and the ratio F of the cel...

experiment example 2

[0079] The temperature rise and voltage tests were carried out under the same conditions as the 11 kinds of cells provided by the examples 1-11 of the present invention and the 5 kinds of cells provided by the comparative examples 1-5. Among them, the charging strategy is: at an ambient temperature of 25±5°C, the cell is wrapped with thermal insulation cotton made of 10mm thick thermal insulation glass wool, and charged to 4.1V at a constant current of 100A1C, and left for 30min; at the same time, the temperature rise The recording conditions are that during the charging process, a multi-channel thermometer is used to monitor the temperature of the battery cell, and one section of the temperature sensing line is connected to the multi-channel thermometer, and the other end is attached to the center point of the large surface of the battery cell. 1s to record the cell temperature. The condition for voltage recording is to use a voltage test device to monitor the voltage of the ...

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Abstract

The invention discloses a battery cell, a battery module and a battery pack, and relates to the technical field of batteries. The battery cell comprises a shell, a roll core and an electrolyte, the roll core and the electrolyte are arranged in the shell, and the roll core is formed by laminating or winding a positive plate, an isolating membrane and a negative plate which are arranged in a laminated manner; the positive plate comprises a positive current collector and a positive active material, the negative plate comprises a negative current collector and a negative active material, at least one of the positive current collector and the negative current collector is a composite current collector, the composite current collector comprises an insulating support layer and a conductive layer, the thickness of the insulating support layer is A, the thickness of the conductive layer is B, and the thickness of the isolating membrane is C; the thickness of the roll core is D; the ratio of the capacity to the surface area of the cell is F; a, B, C, D, and F satisfy 10 < = A * C * (F/107)/(B * D/1000) * 107 < = 30000. The battery cell has the advantages of high energy density and high safety performance.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular, to a battery cell, a battery module and a battery pack. Background technique [0002] At present, the positive electrode current collector used in the pole piece of the lithium ion cell is aluminum foil, and the negative electrode current collector is copper foil. Copper foil and aluminum foil have excellent electrical conductivity, but when the battery is damaged by acupuncture, extrusion, etc., it is easy to short circuit inside the cell, causing thermal runaway of the cell. [0003] In view of this, the present invention is proposed. SUMMARY OF THE INVENTION [0004] The purpose of the present invention is to provide a battery cell, a battery module and a battery pack with high energy density and high safety performance. [0005] Embodiments of the present invention can be implemented as follows: [0006] In a first aspect, the present invention provides a battery...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525H01M10/0585H01M10/0587
CPCH01M4/667H01M10/0587H01M10/0585H01M10/0525Y02P70/50
Inventor 任涛刘宏勇于哲勋
Owner 南京正力新能电池技术有限公司
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