BATTERY MODULE WITH ACTIVE CELL BALANCING USING ENERGY STORAGE ELEMENT AND TWO TIERS OF SWITCHES

• Main Authors: WANG TAO, KIM THEODORE T, NITZ LARRY T, WANG FANG, THOMSON TAMARA R
• Format: Patent
• Language: Chinese; English
• Published: 17.01.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING; VEHICLES IN GENERAL

A battery system includes a battery module, an active cell balancing circuit, and a battery controller. Each cell has diametrically-opposed positive and negative cell tabs. The circuit includes voltage sensors and, at each end of the battery module, first and second tiers of switches and an energy storage element. Each voltage sensor is located between a different pair of adjacent cells. The controller receives measured voltages from the sensors indicative of an electric potential between adjacent battery cells. Responsive to the measured voltages, the controller commands the first tier to selectively connect or disconnect designated pairs of cells to the corresponding second tier. The controller also commands the second tier to selectively connect or disconnect the designated cells to a corresponding energy storage element. This action shuttles energy between the designated pairs of battery cells to balance a state of charge. 一种电池系统包括电池模块、有源单元平衡电路和电池控制器。每个单元具有径向相对的正和负单元接头。该电路包括电压传感器，以及第一和第二层开关以及能量存储元件(在电池模块的