Battery cell, battery module and battery pack

A technology of battery cells and winding cores, which is applied to battery pack components, secondary batteries, electrode carriers/collectors, etc., and can solve problems such as easy short circuit of batteries and thermal runaway of batteries

Pending Publication Date: 2022-07-29
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

Copper foil and aluminum foil have excellent electrical conductivity, but when the battery is damaged by acupuncture, extrusion, etc., the inside of the battery cell is easily short-circuited, causing thermal runaway of the battery cell

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 1-20

[0054] Examples 1-20 respectively provided 20 kinds of cells (battery 1-20), the thickness A of the insulating support layer 201 of the 20 kinds of cells, the thickness B of the separator, the thickness C of the positive electrode active material layer, and the cell winding core. The relationship among the thicknesses D of 204 is shown in Table 1. At the same time, the insulating support layers 201 of the positive current collector and the negative current collector of the 20 types of cells are made of PET, the conductive layer 202 of the positive current collector is made of aluminum foil, and the material of the negative current collector conductive layer 202 is copper foil. The active particles of the positive electrode active material of the positive electrode sheet coated on the positive electrode current collector are nickel cobalt lithium manganate, that is, a ternary nickel cobalt manganese 613 system. The thickness of the negative electrode active material coated on t...

experiment example 1

[0065]Acupuncture experiments were performed on 20 types of cells provided in Example 1-20 and 4 types of cells provided in Comparative Examples 1-4, and during the test, the cells were placed in a constant current of 1.0C and charged to 4.3V, and then After constant voltage charging until the current is reduced to 0.05C, a high temperature resistant steel needle with a diameter of 5mm is used to penetrate from the direction perpendicular to the electrode piece of the cell at a speed of 25mm / s, and the penetration position is close to the geometric center of the acupuncture surface. The steel needle stayed in the cell and observed for one hour. The experimental results are shown in Table 3.

[0066] Table 3. Acupuncture experimental data of cells

[0067]

[0068]

[0069] According to the data tested in Table 3, it can be seen that, compared with Comparative Examples 1-4, Examples 1-20 of the present invention control the relationship between A, B, C and D within this r...

experiment example 2

[0071] The temperature rise and voltage tests were carried out under the same conditions as the 20 kinds of cells provided in the examples 1-20 of the present invention and the 4 kinds of cells provided in the comparative examples 1-4. 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 at least arranged on one side of the insulating support layer, the thickness of the insulating support layer is A, the thickness of a positive electrode active material layer formed after the positive electrode current collector is coated with the positive electrode active material and rolled is C; the thickness of the isolating membrane is B; the thickness of the roll core is D; a, B, C, and D satisfy 0.46 < = (A + B + C) / (D * 1000) < = 11.36. 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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M4/66H01M4/70H01M50/258H01M10/42
CPCH01M10/0587H01M10/0525H01M4/667H01M4/66H01M4/666H01M4/70H01M50/258H01M10/4235
Inventor 赖林聪王汭於洪将
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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