Lithium-ion batteries and electrical equipment

By adopting a liquid replenishment package structure in lithium-ion batteries, using the expansion and contraction of the battery cell to squeeze the liquid replenishment package, replenishing the high concentration of additives consumed in the battery cell, the iron deposition and circulation diving problems caused by additive depletion in the lithium iron phosphate battery during long cycles is solved, and the battery life and power performance are achieved.

CN119050616BActive Publication Date: 2025-05-13BYD CO LTD
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Patent Information

Application Number
CN202411517687.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-05-13
Estimated Expiration
2044-10-29

AI Technical Summary

Technical Problem

Lithium iron phosphate batteries have capacity loss and short circuit due to iron ions dissolution and deposition under long cycles or high temperature cycles. The existing methods such as adding a large amount of VC additives can inhibit iron deposition but will lead to an increase in the battery impedance and affect power performance.

Method used

A lithium-ion battery is designed, using a liquid replenishing package structure, and the liquid replenishing package is built into a second electrolyte with high concentration additives. The liquid replenishing package is squeezed through the expansion and contraction of the battery cell to gradually replenish the additives consumed in the battery cell to avoid iron deposition and circulating diving caused by additive depletion.

Benefits of technology

It effectively extends the battery life, avoids the battery impedance increase caused by high content of additives, improves the overall performance of the battery, and can take into account the battery life and power performance at the same time.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides a lithium-ion battery and an electrical device. The lithium-ion battery comprises: a battery core comprising a first electrolyte; the battery core is arranged inside a shell; at least one fluid replenishment pack is located between the battery core and the shell, the fluid replenishment pack is provided with a fluid replenishment port, a second electrolyte is built in the fluid replenishment pack, the composition of the second electrolyte is the same as that of the first electrolyte, the concentration of the additive in the second electrolyte is greater than the concentration of the additive in the first electrolyte, and when the liquid pack is squeezed, the second electrolyte is squeezed out through the fluid replenishment port and flows into the first electrolyte. As a result, the lithium-ion battery can effectively take into account both life and power performance at the same time, and improve the comprehensive performance of the lithium-ion battery.
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Citation Information

Patent Citations

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