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Lithium ion battery, evaluation method of lithium ion battery, battery module and whole vehicle

A lithium-ion battery and battery module technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as increased heat generation of batteries, decreased battery performance, and decreased output voltage, and achieve ease of design Pressure, improved power performance and discharge efficiency, and the effect of reasonable matching

Pending Publication Date: 2022-08-05
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Internal resistance is an inherent property of lithium-ion secondary batteries. When the battery outputs energy, it will cause the output voltage to drop, the output power to decrease, and the battery's own heat to increase, which will cause battery performance to decline and even affect the service life.

Method used

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  • Lithium ion battery, evaluation method of lithium ion battery, battery module and whole vehicle
  • Lithium ion battery, evaluation method of lithium ion battery, battery module and whole vehicle
  • Lithium ion battery, evaluation method of lithium ion battery, battery module and whole vehicle

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0068] The preparation method of the positive pole piece:

[0069] The positive electrode active material, the conductive agent carbon black, the conductive agent carbon nanotube, and the binder polyvinylidene fluoride are mixed in a certain mass ratio, and the positive electrode slurry is prepared by stirring with N-methylpyrrolidone (NMP) solvent by a planetary mixer; The positive electrode slurry is uniformly coated on both surfaces of the positive electrode current collector aluminum foil, and after drying, rolling and slitting are performed to obtain positive electrode pole pieces.

[0070] The preparation method of the negative pole piece:

[0071] Mix the negative electrode active material, conductive agent carbon black, thickener sodium carboxymethyl cellulose and binder styrene-butadiene rubber (SBR) in a certain mass ratio, use deionized water solvent, and stir to prepare negative electrode slurry by planetary mixer ; Coat the negative electrode slurry evenly on the...

Embodiment 1-3

[0080] The lithium ion batteries provided in Examples 1-3 are designed (including the preparation method) based on the above-mentioned specific embodiments, wherein the coordination relationship between the positive electrode and the negative electrode of the lithium ion battery is: The specific values ​​of each parameter and the data results of the final coordination relationship are shown in Table 1;

[0081] where R c is the resistivity of the positive electrode, T c is the thickness of the positive electrode, P c is the porosity of the positive electrode, R a is the resistivity of the negative electrode, T a is the thickness of the negative pole piece, P a is the porosity of the negative pole piece.

Embodiment 4-7

[0094] The lithium ion batteries provided in Examples 4-7 are designed based on the above-mentioned specific embodiments (including the preparation method), wherein the coordination relationship between the positive electrode and the negative electrode of the lithium ion battery is: The specific value of each parameter and the data result of the final coordination relationship are shown in Table 2;

[0095] where R c is the resistivity of the positive electrode, T c is the thickness of the positive electrode, P c is the porosity of the positive electrode, R a is the resistivity of the negative electrode, T a is the thickness of the negative pole piece, P a is the porosity of the negative pole piece.

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Abstract

The invention provides a lithium ion battery, an evaluation method of the lithium ion battery, a battery module and a whole vehicle. A positive pole piece and a negative pole piece of the lithium ion battery meet the following conditions: Rc is the resistivity of the positive pole piece, Tc is the thickness of the positive pole piece, Pc is the porosity of the positive pole piece, Ra is the resistivity of the negative pole piece, Ta is the thickness of the negative pole piece, and Pa is the porosity of the negative pole piece. By adjusting the resistivity, thickness and porosity parameters in the positive and negative pole pieces, the parameters meet a specific matching relationship, so that the adaptation degree between the positive and negative poles is relatively high, the positive and negative poles are reasonably matched under the condition that the internal resistance of the lithium ion battery is relatively small, the design pressure of the battery is relieved, and the service life of the battery is prolonged. And the power performance and the discharge efficiency of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery, an evaluation method of the lithium ion battery, a battery module and a complete vehicle. Background technique [0002] Internal resistance is an inherent property of lithium-ion secondary batteries. The output energy of the battery will cause the output voltage to drop, the output power to decrease, and the battery's own heat to increase, resulting in a decrease in battery performance and even an impact on service life. In recent years, new energy vehicles have higher and higher requirements for high-rate charge and discharge performance of power batteries, and internal resistance is an important factor affecting battery power performance and discharge efficiency. Therefore, effectively reducing the internal resistance of lithium-ion batteries is an important aspect to improve their applications. [0003] Therefore, how to simply and effective...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M10/42
CPCH01M10/0525H01M10/42H01M4/505H01M4/525H01M2220/20H01M2004/021Y02E60/10
Inventor 李兴旺李文文
Owner TIANJIN ENERGIES
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