Penghui Energy invented an integrated interface solution for battery protection board to reduce hardware costs

As the country attaches more importance to environmental protection and supports new energy policies, power battery manufacturing technology is becoming more mature, and electric vehicles have the strength to compete with traditional fuel vehicles. Electric passenger cars, electric logistics vehicles, electric buses, and electric low-speed vehicles are increasingly appearing in everyone's lives.

At the same time, with the development of power battery PACK technology, the cost requirements for power battery systems are getting higher and higher. In existing power battery systems, relays are usually used to control the on and off of power battery charging and discharging circuits, and charging and discharging have different interfaces. Therefore, the hardware structure is not only complex, but also very costly.

In order to simplify the relevant hardware structure and reduce corporate costs, Penghui Energy applied for an invention patent called "Power Battery Protection Board and Power Battery Protection System" (application number: 202110011257.7) on January 5, 2021. The applicant is Henan Penghui Power Co., Ltd.

Based on the relevant information currently disclosed by the patent, let us take a look at this technical solution.

As shown in the figure above, it is a schematic diagram of the structure of the power battery protection board invented in the patent. The circuit protection board mainly includes: a central processing unit 10, a battery protection chip 20, a discharge switch tube 30 and a charging switch tube 40. Among them, the battery protection chip is respectively connected to the central processing unit, the state detection end of the battery module, the first end of the discharge switch tube and the first end of the charging switch tube. At the same time, the second end and the third end of the discharge switch tube are respectively connected to the negative electrode of the battery module and the second end of the charging switch tube, and the third end of the charging switch tube is connected to the first end of the load.

The battery protection chip is used to collect the battery status information of the battery module and send the battery status information to the central processing unit; the central processing unit will receive the battery status information and, if it determines that there is an abnormality in the working status of the battery module based on the battery status information, send a power-off control instruction to the battery protection chip.

The battery protection chip is mainly used to receive a power-off control instruction, and output a first control level to the charging switch tube and the discharging switch tube based on the power-off control instruction, so that the charging switch tube and the discharging switch tube are disconnected, cutting off the charging and discharging of the battery module.

Based on the above hardware structure design, we know that the discharge switch tube and the charge switch tube are connected in series in a loop. Therefore, the battery module can share the same interface when discharging the load through the power battery protection board or charging the battery module using the power battery protection board. That is, the charge and discharge same port design structure. This circuit structure greatly simplifies the hardware structure design, saves costs, and improves the user experience.

In addition, this solution uses discharge switch tubes and charging switch tubes to replace relays in traditional power battery systems. Since the cost difference between switch tubes and relays is large, this power battery protection board can further reduce hardware costs.

The above is the power battery protection board system and solution invented by Penghui Energy. This solution connects the charging switch tube and the discharging switch tube in series on the same circuit, thereby realizing that charging and discharging share the same interface, simplifying the hardware structure of the power battery protection board, and saving hardware costs by using switch tubes to replace the functions of relays in traditional power battery systems.