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Battery cell, battery module and battery pack

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

Pending Publication Date: 2022-08-09
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 core is damaged by acupuncture, extrusion, etc., the inside of the battery core is easy to short circuit, causing thermal runaway of the battery core

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

[0051] Embodiments 1-20 respectively provide 20 kinds of cells (cells 1-20), the thickness A of the insulating support layer 301 of the 20 kinds of cells, the weight percentage I of the nickel element in the positive electrode active material, and the thickness of the separator are F3. The relationship between them is shown in Table 1. At the same time, the positive electrode current collector and the insulating support layer 301 of the negative electrode current collector of the 20 types of cells are made of PET, the conductive layer 302 of the positive electrode current collector is made of aluminum foil, and its thickness is 10um, and the material of the negative electrode current collector conductive layer 302 is copper foil, its thickness is 10um. The active particles of the positive electrode active material are nickel cobalt lithium manganate. The active particles of the negative electrode active material are graphite. The isolation film materials of the 20 cells can ...

experiment example 1

[0061] The 20 types of cells provided in Examples 1-20 and the 4 types provided in Comparative Examples 1-4 were subjected to acupuncture experiments according to the process in the national standard GBT31485. The test conditions were: 25±5°C, fully charged to 4.2V, 3mm steel The needle was inserted into the explosion-proof valve of the cell (with a clamp) at a speed of 25mm / s, and the experimental results were shown in Table 3 after 1 hour of observation.

[0062] Table 3. Acupuncture experimental data of cells

[0063]

[0064] According to the data tested in Table 3, compared with Comparative Examples 1-4, the thickness A of the insulating support layer 301, the weight percentage I of the nickel element in the positive electrode active material, and the separator of the embodiment 1-20 of the present invention The thickness of F is within the range of 0.01≤(A*F / I) / 1000≤3, which can ensure the safety performance of the cell, so that there is no smoke, no fire and no explo...

experiment example 2

[0066] 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 of voltage recording is to use a voltage test device to monitor the voltage of the p...

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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 battery cells. 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 nickel-containing positive active material coated on the positive current collector, the positive current collector is a composite current collector comprising 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 unit is [mu] m, the weight percentage of a nickel element in the positive active material is I, and the unit is [mu] m. The unit is%; the thickness of the isolating membrane is F, and the unit is mu m; and the thickness A of the insulating support layer, the weight percentage I of the nickel element in the positive electrode active material and the thickness F of the isolating membrane satisfy 0.01 < = (A * F / I) / 1000 < = 3. 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 battery cells, 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 cell 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 batter...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M4/66H01M10/0525H01M4/525H01M4/505H01M4/38H01M50/463
CPCH01M10/0587H01M4/667H01M10/0525H01M4/525H01M4/505H01M4/38H01M50/463Y02P70/50
Inventor 兰辉荣
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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