BMS battery protection system

Abstract

The invention discloses a BMS battery protection system which comprises at least a lithium battery module, a discharge circuit, a monitoring control circuit and a load end, wherein the lithium batterymodule is connected to a load end via the discharge circuit; and the circuit conduction control between the discharge circuit and the load end is completed by the monitoring control circuit. The circuit structure of the BMS battery protection system of the invention enables the charging and discharging of the lithium battery module to be completed by a relay, thereby reducing a failure rate of the protection system and reducing the maintenance cost of the battery. Moreover, the power discharge process of the system is realized by turning off the load, thereby reducing the use frequency of therelay in the discharge circuit, reducing the failure rate of the relay, avoiding controlling the damage to a MOS power tube in the discharge circuit if a voltage and current sensor on the discharge circuit in a conventional battery protection device detects a short-circuit or overloaded state, and avoiding the problem that the current is too large when the relay is disconnected such that a switcharc causes the aging failure of a switch contact.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a BMS battery protection system. Background technique [0002] With the country's vigorous promotion of new energy vehicles, new energy electric vehicles have developed rapidly. The battery pack of the power battery is getting bigger and bigger, and the number of batteries is also increasing. Because in the design process, all the batteries are connected in series to form a high voltage, and then each module is connected in series or in parallel and the shell structure is designed into a Pack battery pack. Due to the voltage characteristics of the lithium battery itself, it must be used with a lithium battery protection board or a lithium battery protection system to be used safely. The main function of the lithium battery protection system: When the battery discharge voltage drops to a certain value, the battery circuit is cut off to prevent the battery voltage from ...

AI Technical Summary

Problems solved by technology

[0003] During the discharge process of traditional rechargeable batteries, when the voltage and current monitor on the circuit detects a short circuit or overload, the switch in the discharge circuit is controlled to be disconnected. The arc phenomenon can easily lead to the aging failure of the switch contacts, so that the battery protection system cannot work normally

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