Battery cell, battery pole piece and preparation method thereof, battery

A battery cell and negative pole piece technology, applied in the field of battery pole piece and its preparation, and battery core, can solve the problems of affecting lithium ion transmission, adverse effects of battery rate performance and low temperature performance, and sacrificing battery electrochemical performance, etc.

Active Publication Date: 2021-05-18
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach often sacrifices the electrochemical performance of the battery and cannot fundamentally solve the problem.
There are also some technologies that divide the battery current collector into two areas, one of which is coated with an active material coating, and the other area is coated with a PTC material coating. The resistivity of the material increases rapidly, thereby blocking the transmission of electrolyte ions, or directly blocking the circuit, thereby protecting the battery system and improving the safety performance of the battery. Although this method prevents the temperature of the battery from changing to a certain extent Further increase, but it will easily lead to an increase in the internal resistance of the battery, a decrease in the energy density of the battery, etc., which will have a great impact on the performance of the battery
There are also some technologies that wrap the flame retardant in microcapsules, mix them with a solution containing a separator protective agent and coat them on the surface of the separator, and finally fix the microcapsules on the surface of the separator. When the battery thermal runaway occurs, release the resistance The fuel protects the battery, but this method will increase the internal resistance of the separator, affect the transmission of lithium ions, and adversely affect the rate performance and low temperature performance of the battery

Method used

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  • Battery cell, battery pole piece and preparation method thereof, battery
  • Battery cell, battery pole piece and preparation method thereof, battery
  • Battery cell, battery pole piece and preparation method thereof, battery

Examples

Experimental program
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preparation example Construction

[0042] Another embodiment of the present invention provides a method for preparing the above battery pole piece, comprising the following steps:

[0043] S1. A current collector is provided.

[0044] In this specific embodiment, the current collector is copper foil. It can be understood that in other embodiments, the current collector may be a current collector made of other materials.

[0045] S2. Coating an active material coating on one surface of the current collector to form an active material coating.

[0046] In this specific embodiment, the active material coating is a negative electrode active material coating.

[0047] Specifically, graphite, conductive agent, binder and auxiliary agent are mixed, and a negative electrode active material coating is made through a homogenization process, and then a coating machine is used to coat the negative electrode active material coating on one surface of the current collector. After continuous oven drying, an active material ...

Embodiment 1

[0083] 1. Preparation of negative electrode active material coating

[0084] Add graphite, conductive carbon black, sodium carboxymethyl cellulose, water-based styrene-butadiene latex SBR and deionized water into the homogenizer mixer in batches according to the mass ratio of 91.5:6:1.2:1.3:102, and the order of addition is deionized Water, sodium carboxymethyl cellulose, conductive carbon black, graphite and water-based styrene-butadiene latex SBR, before adding graphite, rotate at 15r / min, rotate at 300r / min and stir for 300min, after adding graphite, rotate at 15r / min, rotate at 800r / min 1. Stir for 150min under the condition of vacuum degree of -85KPa. After the homogenization is completed, a uniformly dispersed negative electrode active material coating is obtained, and the coating is placed in a transfer tank, and stirred at a low speed of 15r / min, and set aside.

[0085] 2. Preparation of flame retardant coating

[0086] The inorganic flame retardant ammonium polyphosp...

Embodiment 2

[0095] Example 2 is basically the same as Example 1, except that the mass ratio of flame retardant, solvent, anti-settling agent, adhesive and surfactant in the flame-retardant coating of Example 2 is 6.5:7.7:0.05:0.05: 0.005.

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Abstract

The invention relates to a battery cell, a battery pole piece and a preparation method thereof, and a battery, wherein the battery cell includes two first negative pole pieces located on the outside, and a positive pole piece located between the two first negative pole pieces. sheet, and a diaphragm between the first negative electrode sheet and the positive electrode sheet; the first negative electrode sheet includes a first negative electrode current collector, a negative electrode disposed on a surface of the first negative electrode current collector active material coating, and a flame retardant coating on the other surface of the first negative electrode collector, the negative active material coating on each of the first negative electrode sheets is opposite to the positive electrode sheet ; Wherein, the raw materials of the flame retardant coating include flame retardants, anti-settling agents, adhesives and surfactants. The present invention can improve the safety performance of the battery by applying a flame-retardant coating on the first negative pole piece, and the flame-retardant layer is located at the outermost side of the battery cell, without affecting the internal resistance, rate, cycle and other electrochemical properties of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery cell, a battery pole piece, a preparation method thereof, and a battery. Background technique [0002] In recent years, with the rapid development of portable electronic products, electric vehicles, and energy storage power stations, lithium-ion batteries have become the preferred chemical power sources due to their high energy density, high operating voltage, small self-discharge, and long cycle life. With the upgrading of products, people have higher and higher requirements for the energy density of lithium-ion batteries, but the safety performance has not been upgraded simultaneously. In actual use, safety accidents occur from time to time, mainly because lithium-ion batteries are exposed to high The contraction and embrittlement of the diaphragm during the process of falling, falling, etc. lead to thermal runaway, such as contact short circuit between cathode and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0585H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/667H01M10/0525H01M10/0585H01M2200/00Y02E60/10Y02P70/50
Inventor 李景夫易四勇林琳任超
Owner 余姚市海泰贸易有限公司
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