Lithium-ion battery pack and charging system

The lithium-ion battery pack system addresses the challenge of distinguishing BMS circuit failures from battery cell issues by using a communication control unit and relay circuit to externally output terminal voltages, facilitating accurate failure diagnosis and degradation analysis.

JP7868750B2Active Publication Date: 2026-06-02MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2023-10-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing lithium-ion battery pack systems fail to accurately determine whether a failure is due to the BMS circuit or the battery cell, leading to prolonged identification of the specific cause of failure.

Method used

The lithium-ion battery pack includes a communication control unit that outputs terminal voltage values externally without going through the BMS circuit, and a relay circuit that conducts or interrupts power supply to the battery cell, allowing external devices to determine the cause of failure independently of the BMS circuit.

Benefits of technology

Enables reliable determination of failure causes, allowing for timely repair and analysis of battery cell degradation, reducing downtime and improving user convenience.

✦ Generated by Eureka AI based on patent content.

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Abstract

A lithium ion battery pack (10) comprises: a lithium ion battery cell (20); a housing in which the lithium ion battery cell (20) is built and which is provided with a positive electrode terminal (Pvcc+), a negative electrode terminal (Pvcc-), and communication terminals (Pcl+, Pcl-); a BMS circuit (110) which is built in the housing and which includes a control unit that controls charging and discharging of the lithium ion battery cell (20); a communication IC (40) which causes terminal voltage values of the lithium ion battery cell (20) to output to the outside through the communication terminals (Pcl+, Pcl-) without passing through the BMS circuit (110); a first relay circuit (61) which, upon receiving a first control signal from the control unit of the BMS circuit (110), conducts or cuts off power supply to the lithium ion battery cell (20) through the positive electrode terminal (Pvcc+) and the negative electrode terminal (Pvcc-); an LDO (51) which supplies power to the control unit; and an LDO(52) which supplies power to the communication IC (40) separately from the LDO (51).
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