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a battery

A technology of batteries and conductive layers, applied in the direction of lithium batteries, battery electrodes, secondary batteries, etc., can solve the problems of inability to effectively prevent the short circuit of lithium ion batteries, unable to ensure the battery continues to work, and the battery can not continue to work, etc., to improve the work. Stability and service life, guaranteed rate performance, and the effect of reducing short-circuit current

Active Publication Date: 2020-11-06
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods in the prior art cannot effectively prevent the occurrence of a short circuit in the lithium-ion battery, and there is no guarantee that the battery can continue to work after the abnormal situation occurs.
In the above-mentioned improved methods, after the internal short circuit occurs in the battery, the battery temperature will still rise sharply. When the battery temperature rises suddenly, if the safety components cannot respond quickly, there will still be different degrees of danger; and in the above-mentioned improvements In the method, after the safety component responds, although the potential safety hazard of the battery is resolved, the battery cannot continue to work

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] 1. Preparation of positive electrode current collector:

[0091] Select an insulating layer of a certain thickness, and form a conductive layer of a certain thickness on its surface by vacuum evaporation, mechanical rolling or bonding, and a protective layer by vapor deposition, in-situ formation or coating.

[0092] 1.1 Formation of conductive layer

[0093] There are several ways to form the conductive layer:

[0094] (1) The formation conditions of the vacuum evaporation method of the conductive layer are as follows: the insulating layer that has been cleaned on the surface is placed in a vacuum coating room, and the high-purity metal wire in the metal evaporation room is melted and evaporated at a high temperature of 1600 ° C to 2000 ° C. After evaporation, The metal passes through the cooling system in the vacuum plating room, and finally deposits on the surface of the insulating layer to form a conductive layer.

[0095] (2) The formation conditions of the condu...

experiment example 2

[0131] 1. Battery test method:

[0132] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0133] Charge and discharge the lithium-ion battery at two temperatures of 25°C and 45°C, that is, first charge to 4.2V with a current of 1C, and then discharge to 2.8V with a current of 1C, and record the discharge capacity of the first week; Then the battery was subjected to a 1C / 1C charge-discharge cycle for 1000 cycles, and the battery discharge capacity of the 1000th cycle was recorded, and the discharge capacity of the 1000th cycle was divided by the discharge capacity of the first cycle to obtain the capacity retention rate of the 1000th cycle.

[0134] The experimental results are shown in Table 4.

[0135] 2. Experimental methods and test methods for one nail piercing experiment and six consecutive nail piercing experiments:

[0136] (1) One-time nail-piercing experiment: After the battery is fully charged, fix it, and at room temperatu...

Embodiment 3

[0159] The difference from Example 1 is that copper foil with a thickness of 1-12 μm is selected as the negative current collector for the negative current collector.

[0160] 1. Test of elongation at break of negative electrode current collector:

[0161]Select 9 kinds of negative electrode current collectors with a thickness ranging from 1 to 12 μm, and take two negative electrode current collector samples with a length of 200 mm and a width of 15 mm on the negative electrode current collector. Then fix the negative electrode current collector sample on the tensile machine (model AI7000), record the initial length L0, start the tensile machine test until the negative electrode current collector sample breaks, and read the displacement distance L1 of the negative electrode current collector sample from the tensile machine when it breaks. 2 The average value of the values ​​obtained in two tests is the test result. Elongation at break=(L1-L0) / L0*100%.

[0162] Table 7 shows ...

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Abstract

The present application relates to the field of batteries, in particular, to a battery. The battery of the present application includes a positive electrode sheet, a negative electrode sheet, and an electrolyte. The positive electrode current collector includes an insulating layer and a conductive layer. The insulating layer is used to carry a conductive layer. The conductive layer is used to carry a positive electrode active material layer. On at least one surface, the thickness of the conductive layer is D2, and D2 satisfies: 300nm≤D2≤2μm; at least one surface of the conductive layer is provided with a protective layer; the negative current collector is a copper foil current collector with a thickness of 1 μm to 5.9 μm. The battery of the present application can not only improve the safety performance of the battery, but also have good rate performance, and can also increase the weight energy density of the battery.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. However, when lithium-ion batteries are subjected to abnormal conditions such as extrusion, collision or puncture, they are prone to fire and explosion, causing serious hazards. Therefore, the safety problems of lithium-ion batteries have largely limited the application and popularization of lithium-ion batteries. [0003] A large number of experimental results show that the short circuit in the battery is the root cause of the safety hazard of lithium-ion batteries. In order to avoid short circuits in the battery, researchers have tried to improve the structure of the separator, the mechanical structure of the battery, and so on. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525H01M10/42
CPCH01M4/667H01M4/661H01M10/0525H01M10/4235H01M2004/021H01M2004/028H01M4/64H01M10/052Y02E60/10Y02P70/50
Inventor 梁成都黄华锋黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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