Charge equalization circuit for e.g. lithium ion battery cells of vehicle, has connection unit delivering battery cell via direct current/direct current converter selectively either with another battery cell or connecting third cell

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent discloses a charge equalization circuit for batteries, especially lithium-ion cells in vehicles. The system uses a DC/DC converter and a configurable connection unit to selectively redistribute charge among battery cells, ensuring all cells maintain similar charge levels. Voltage measurements and a switch matrix enable precise and flexible control.

Use CasesContent extracted from patent full text and abstract with AI.

• Electric vehicles (EVs) to ensure battery health and performance
• Battery management systems for renewable energy storage
• Industrial battery backup units requiring uniform cell voltage
• Consumer electronics with multiple battery cells (e.g., laptops, power tools)
• Grid-connected battery packs for stabilization purposes

BenefitsContent extracted from patent full text and abstract with AI.

• Prevents overcharging or deep discharge of individual cells, enhancing safety
• Extends overall battery lifespan through uniform charge maintenance
• Improves energy efficiency by minimizing imbalance losses
• Allows flexible battery cell configurations and easy integration
• Supports multiple battery chemistries, especially useful for lithium-ion cells

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The circuit (10) has a direct current (DC)/DC converter (16), and a connection unit for equalization of charge during electrical connection via the DC/DC converter between pole terminals (32-1 to 32-5) of series-connected battery cells (14-1 to 14-4) e.g. e.g. lithium ion battery cells. The connection unit delivers one of the cells via the converter selectively either with the other cell or connects the third cell. A measurement device measures voltage of the battery cells. A DC-bus (18) and a switch matrix (20) are set together with the unit to connect the converter with a battery stack (12). An independent claim is also included for a method for controlling charge equalization between the battery cells.