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Battery combination for improving rate discharge performance of lithium ion batteries

A high-rate discharge performance, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as low electrolyte conductivity, limited use of lithium batteries, and high resistance to lithium ion diffusion

Inactive Publication Date: 2014-12-10
JUHEYUAN SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have been widely used in various fields, but under high-rate discharge conditions, due to the large internal impedance of the battery, the voltage of lithium batteries drops rapidly at the initial stage of high-current discharge, which limits the performance of lithium batteries under high-rate conditions. usage of
The reasons for the poor high-rate discharge performance of lithium batteries are as follows: 1. The conductivity of the electrolyte is low; 2. The diffusion resistance of lithium ions inside the electrode material is relatively large; 3. The electronic conductivity is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] (1) Assemble the lead-acid battery and lithium iron phosphate battery. The middle layer is a lead-acid battery, and the upper and lower layers are lithium iron phosphate batteries. The lead-acid battery and lithium iron phosphate battery are connected in parallel. Among them, the lead-acid battery is 8S, the lithium iron phosphate battery is 5S, and the lead-acid battery is placed in the middle of the lithium iron phosphate battery pack;

[0007] (2) For the assembled battery pack, first perform a high-current charge-discharge cycle on the lead-acid battery, and at the same time measure the surface temperature of the lithium iron phosphate battery (the surface temperature of the lithium iron phosphate battery can reach 50-60°C after the measurement), and wait for the temperature to stabilize , to charge the lithium iron phosphate battery;

[0008] (3) Then discharge the parallel battery pack with a large current to 12V.

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PUM

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Abstract

The invention relates to a solution for improving the rate discharge performance of lithium ion batteries, in particular to a battery combination for improving rate discharge performance of the lithium ion batteries. The battery combination comprises the lithium ion batteries, wherein heat-supply batteries are arranged between the lithium ion batteries, and serve as heat sources. Because the heat-supply batteries can perform high-current charge / discharge, certain heat can be generated in the high-current charge / discharge process. According to the battery combination, the heat generated by the batteries are utilized and transferred to the surfaces of the lithium ion batteries, so that the lithium ion batteries (packs) are heated, temperatures of the lithium ion batteries (packs) are increased, and the rate discharge performance of the lithium ion batteries can be improved. The battery combination has the excellent effect that the heat-supply batteries can provide certain energy while serving as the heat sources of the lithium ion batteries.

Description

technical field [0001] The invention relates to a battery combination for improving the rate discharge performance of a lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in various fields, but under high-rate discharge conditions, due to the large internal impedance of the battery, the voltage of lithium batteries drops rapidly at the initial stage of high-current discharge, which limits the performance of lithium-ion batteries under high-rate conditions. usage of. The reasons for the poor high-rate discharge performance of lithium batteries are as follows: 1. The conductivity of the electrolyte is low; 2. The diffusion resistance of lithium ions inside the electrode material is relatively high; 3. The electronic conductivity is low. Therefore, it is necessary to develop new technologies to solve the above problems. Contents of the invention [0003] In order to solve the above problems, heating the battery before the battery ...

Claims

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Application Information

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IPC IPC(8): H01M10/615
CPCY02E60/10
Inventor 潘军王秀峰
Owner JUHEYUAN SCI & TECH CO LTD
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