Lithium-ion battery cell balancing system and method, and battery charging device with lithium-ion battery cell balancing

The lithium-ion battery cell balancing system addresses inefficient charging by using a BMS to balance cell voltages and maintain constant voltage mode, ensuring safe and complete charging.

JP7763914B2Active Publication Date: 2025-11-04NOCO CO
5 Cites 0 Cited by

Patent Information

Application Number
JP2024169998
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-06-02
Filing Date
2024-09-30
Publication Date
2025-11-04
Estimated Expiration
2041-06-02

AI Technical Summary

Technical Problem

Existing battery chargers for lithium-ion rechargeable batteries cycle between lithium mode and standby mode due to unbalanced cell voltages, leading to inefficient charging and voltage cutoffs, which are not effectively managed by current Battery Management Systems (BMS).

Method used

A lithium-ion battery cell balancing system and method that includes a BMS to monitor and balance individual cell voltages, using resistive loads to equalize cells, and a battery charger that distinguishes between BMS-induced cutoffs and user disconnections, maintaining charging in a constant voltage mode to allow cell balancing.

Benefits of technology

Ensures safe and efficient charging by maintaining balanced cell voltages within a safe range, reducing cycling between modes and ensuring complete charge without user intervention.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

To provide a lithium-ion rechargeable battery charging system including lithium cell balancing and a lithium cell balancing method.SOLUTION: A battery charging device 10 includes a plurality of lithium-ion rechargeable battery cells 26A to 26D connected in series and a battery management system (BMS). The BMS includes a discharge field effect transistor (FET) 30 and a charge FET 32. A lithium-ion rechargeable battery charging system including a lithium cell balancing mode includes a lithium-ion rechargeable battery and a battery charging device 20 configured for charging the lithium-ion rechargeable battery. Cell balancing of the lithium-ion rechargeable battery cell of the lithium-ion rechargeable battery continues for a predetermined time from the start of the cell balancing mode.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art