System for monitoring battery voltage

Abstract

The invention relates to a system for monitoring a battery voltage. The system comprises a voltage acquisition module, a battery coding module and a timing pulse module, wherein the voltage acquisition module is connected with a single battery and used for acquiring voltages of single batteries, the battery encoding module is connected with the voltage acquisition module and is used for encoding the single batteries and controlling the voltage acquisition module to acquire the voltages of the single batteries in sequence, and the timing pulse module is connected with the battery coding moduleand is used for providing a voltage acquisition time pulse sequence and controlling the voltage acquisition time. The system is advantaged in that the specific position of the battery batteries with an abnormal voltage can be obtained while the voltage of the battery batteries is accurately monitored.

Description

technical field [0001] The invention relates to the technical field of voltage detection, in particular to a system for monitoring battery voltage. Background technique [0002] The health status of lithium-ion power batteries often directly restricts the performance of pure electric vehicles. In actual use, the battery system often needs to monitor the voltage, temperature, capacity, circuit status and targeted thermal management of the battery at the same time. The battery system needs to deal with complicated The data. Taking the Tesla Model S as an example, its battery system is equipped with 7104 18650 cylindrical lithium-ion power batteries. It claims to be able to monitor the voltage status and actual temperature of each battery, but in fact the system can only monitor the power of each 74 batteries. The voltage of the module, and there are only two temperature monitoring points in a module, and the voltage of each battery cell cannot be accurately monitored. [000...

AI Technical Summary

Problems solved by technology

Taking the Tesla Model S as an example, its battery system is equipped with 7104 18650 cylindrical lithium-ion power batteries. It claims to be able to monitor the voltage status and actual temperature of each battery, but in fact the system can only monitor the power of each 74 batteries. The voltage of the module, and there are only two temperature monitoring points in a module, and the voltage of each battery cell cannot be accurately monitored

[0003] The battery voltage and temperature conditions often directly reflect the actual condition of the battery and affect the capacity estimation of the battery, which in turn directly affects the performance of the battery system.

Although the principle of battery voltage measurement is simple, the total amount of data required to monitor each battery is extremely large

[0004] Common pure electric vehicle voltage monitoring methods include direct measurement. This method is to monitor the voltage of each battery directly by the battery management system in real time. Its advantage is that it can monitor the voltage of each battery and the measurement is accurate, but its The shortcomings are also very obvious. It is suitable for systems with a small number of batteries. For battery systems with a large number of batteries, the amount of data that this method needs to process is too large, and the number of interfaces required is also very large, which seriously limits the battery management system. The information processing performance and the energy density of the battery system

The second method is to monitor the voltage of the module after the batteries are grouped. This method can greatly reduce the amount of monitoring data. A module failure is detected or a module failure is detected but the specific failure point cannot be located

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