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A method for improving the heat dissipation of lithium batteries at high temperatures

A lithium battery, battery technology, applied in the direction of secondary battery, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve the problems of shortening the service life of the battery pack, unable to enhance the air flow rate, and increasing the effect of heat dissipation. , to achieve the effect of increasing air flow, increasing air heat exchange and cooling effect, and enhancing air circulation effect

Active Publication Date: 2021-08-20
SHANGHAI YUYUAN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of grid energy storage, the performance of the grid energy storage battery pack is greatly affected by temperature, especially in high temperature environments. As the temperature rises, the self-discharge of the battery pack increases, which reduces the service life of the battery pack. As a result, unsafe accidents such as fire and explosion may occur, so it is necessary to dissipate heat from the battery pack, and the air-cooled method is often used in the market to dissipate heat from the battery pack;
[0003] In the comparative document CN201710882858.9, the air-cooled heat dissipation module is installed on the outside of the battery box, and the heat conduction element is installed on the battery module so that the heat conduction element can be arranged toward the through hole, and the air-cooling heat dissipation module is used to blow the heat conduction element, thereby It can dissipate the heat of the battery pack, but in the process of heat dissipation, the hot air cannot be completely discharged, and part of the hot air will be accumulated in the battery module, which cannot increase the air flow rate and increase the effect of heat dissipation. Therefore, an improved lithium battery is needed. The method of dissipating heat at high temperature to solve the above problems

Method used

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  • A method for improving the heat dissipation of lithium batteries at high temperatures
  • A method for improving the heat dissipation of lithium batteries at high temperatures
  • A method for improving the heat dissipation of lithium batteries at high temperatures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: In the step S3, the temperature inside the battery is T, the power of the fan is Q, and the curve of power and temperature is fitted using MATLAB instructions and the linear least square method, and the corresponding temperature and fan The power value is as follows:

[0064] Ti 35 40 26 24.5 37.3 Qi 15 20 14 10 17

[0065] According to the formula:

[0066] f(q)=α 1 t 2 +α 2 t+α 3 ;

[0067] Using MATLAB instructions:

[0068] X=20:20.1:50;

[0069] Y=[1014151720];

[0070] R=[(X.^2)'X'ones(5,1)];

[0071] α=R / Y';

[0072] Get the calculation result: α 1 =22.302,α 2 = 31.407, α 3 =-6.318;

[0073] f(q)=22.302t 2 +31.407t-6.318;

[0074] According to the above summary, the existing data is stored in the database, and the data in the database is used for linear quadratic fitting. Through the above function, the battery pack fan 2 can be controlled according to the measured temperature of the battery pack 1 Rapid...

Embodiment 2

[0075] Embodiment 2: The following uses the preset temperature of 46°C as an example to describe the present invention in detail:

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Abstract

The invention discloses a method for improving heat dissipation of a lithium battery at high temperature, and relates to the technical field of battery BMS. The heat dissipation method includes a battery pack, the battery pack is arranged in a battery PACK module, a battery PACK fan is installed under the battery, a fixing frame is provided between the battery PACK fan and the battery, and the battery A battery PACK box is installed on the top of the battery pack, a fixing frame is arranged between the battery pack and the battery PACK box, and several through holes are provided on the upper surface of the battery PACK box, corresponding to the bottom of the through holes on the upper surface of the battery PACK box There are several PACK box flat openings and several PACK box convex openings, the fan blows air to the PACK box convex openings through the battery PACK box flat openings, and the air flows out from the through holes corresponding to the PACK box convex openings. When the air passes through the battery pack box, the pressure difference between the flat mouth of the pack box and the convex mouth of the pack box is created, so that the air inside the battery can be discharged quickly.

Description

technical field [0001] The invention relates to the technical field of battery BMS, in particular to a method for improving heat dissipation of lithium batteries at high temperatures. Background technique [0002] With the development of grid energy storage, the performance of the grid energy storage battery pack is greatly affected by temperature, especially in high temperature environments. As the temperature rises, the self-discharge of the battery pack increases, which reduces the service life of the battery pack. As a result, unsafe accidents such as fire and explosion may occur, so it is necessary to dissipate heat from the battery pack, and the air-cooled method is often used in the market to dissipate heat from the battery pack; [0003] In the comparative document CN201710882858.9, the air-cooled heat dissipation module is installed on the outside of the battery box, and the heat conduction element is installed on the battery module so that the heat conduction eleme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/627H01M10/633H01M10/635H01M10/647H01M10/6556H01M10/6563H01M10/44H01M10/48F04D27/00
CPCF04D27/004H01M10/441H01M10/446H01M10/482H01M10/486H01M10/613H01M10/627H01M10/633H01M10/635H01M10/647H01M10/6556H01M10/6563Y02E60/10
Inventor 尚德华王嘉兴
Owner SHANGHAI YUYUAN POWER TECH CO LTD
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