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Composite positive electrode sheet with rapid heating function, and cell and battery using same

A composite positive electrode and positive electrode sheet technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low heating film heating efficiency, poor heating consistency, battery heating, etc., and achieve simple structure, small changes, and improved pole The effect of sheet temperature

Active Publication Date: 2021-06-01
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complicated to assemble, the heating efficiency of the heating film is low, and the cell cannot be heated from the pole piece level, and the heating consistency is still poor

Method used

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  • Composite positive electrode sheet with rapid heating function, and cell and battery using same
  • Composite positive electrode sheet with rapid heating function, and cell and battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a composite positive pole piece 1, the composite positive pole piece 1 includes two positive pole pieces 2, a thermal resistance sandwich structure 3 is arranged between the two positive pole pieces 2, and the thermal resistance sandwich structure 3 includes two A layer of diaphragm 302 and a layer of thermal resistance sheet 301 placed between the two layers of diaphragm 302, the thermal resistance sheet 301 is provided with two tabs 4 of the thermal resistance sheet at a certain distance. Wherein, the positive electrode sheet 2 is a single-sided positive electrode sheet, and the slurry layer of the single-sided positive electrode sheet faces the interior of the composite positive electrode sheet 1 .

[0051] It can be seen from the above structure that the thermal resistance sheet 301 is separated from the two positive electrode sheets 2 by the diaphragm 302 .

[0052] The composite positive pole piece of this embodiment is connected to the lu...

Embodiment 2

[0056] Except that the positive electrode sheet 2 is replaced by a double-sided positive electrode sheet, other structures are the same as in Embodiment 1.

[0057] The composite positive pole piece of this embodiment is connected to the lug of the heat resistance plate through a built-in power supply or an external power supply, and can generate heat after being energized, achieving the purpose of rapid heating from the level of the pole piece.

Embodiment 3

[0059] This implementation provides a battery cell, including a positive electrode, a separator, and a negative electrode. The positive electrode and the negative electrode are located on both sides of the separator. , separator, composite positive electrode sheet, separator, negative electrode, separator, composite positive electrode sheet, separator, negative electrode... Place the above-mentioned parts in order, and then wind them to obtain a bare cell.

[0060] Set the positive pole lug and the negative pole lug on the positive pole and the negative pole respectively, connect the positive pole lug and the negative pole lug to the top cover respectively, lead the thermal resistance plate lug to the outside of the cell, control the heating and sealing through the external circuit control strategy Finally, the electrolyte is injected and assembled into a battery cell.

[0061] The composite positive pole piece of this embodiment generates heat through the external circuit, an...

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Abstract

The invention discloses a composite positive electrode sheet with a rapid heating function, and an electric cell and a battery using the same. The composite positive electrode sheet includes two positive electrode sheets and at least one layer of thermal resistance sheet, and the thermal resistance sheet and the positive electrode sheet are separated by a separator. When the number of layers of the thermal resistance sheet is more than two layers, the adjacent thermal The resistance plates are separated by a diaphragm, and at least one tab of the heat resistance plate is arranged on the heat resistance plate. The composite positive pole piece of the present invention has a novel structure. By connecting the tabs of the thermal resistance plate with an external power supply or a built-in power supply, rapid heating of the composite positive pole piece can be realized after power-on. Uniform heat is conducive to better control of the voltage window of the battery cell. Most of the heat generated can accurately increase the temperature of the pole piece, with high thermal efficiency. Moreover, the composite positive pole piece can improve the capacity efficiency and cycle performance of the battery cell.

Description

technical field [0001] The invention belongs to the field of battery technology, and relates to a composite positive pole piece, a cell and a battery using the same, and in particular to a composite positive pole piece with a rapid heating function, and a battery cell and a battery using the same to rapidly heat up and improve The discharge performance of the battery core at low temperature. Background technique [0002] At present, new energy vehicles and energy storage have achieved rapid development, the core components of which are lithium-ion power batteries. Lithium-ion power batteries contain positive electrodes, negative electrodes and electrolytes. The electrolyte currently used is generally liquid. Due to the high freezing point of the liquid electrolyte, the low-temperature performance deteriorates, such as below 0°C, which will result in reduced power or failure to discharge. Especially in the military field or the cold north, there are greater requirements fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/654H01M10/6553H01M10/6571
CPCH01M10/615H01M10/654H01M10/6553H01M10/6571Y02E60/10
Inventor 邹武俊孔令明刘宏勇刘应如华秉杨邹武元
Owner CONTEMPORARY AMPEREX TECH CO
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