Battery module pre-charging, overvoltage and overcurrent protection circuit and method

Abstract

The invention discloses a battery module pre-charging, overvoltage and overcurrent protection circuit and method. The protection circuit comprises a relay, a pre-charging module, an overcurrent protection module and an overvoltage protection module. The relay comprises a shell, a first armature, a second armature, a reset spring, a movable contact plate, a first static contact, a second static contact, a first electromagnet, a second electromagnet, a third electromagnet and a fourth electromagnet. The circuit is pre-charged and then works normally; when overcurrent occurs in the circuit, the circuit can be automatically disconnected without damaging other electrical elements in the circuit, and the purpose of overcurrent protection of the battery module can be achieved without installing a fuse; and when the two ends of the battery module are overvoltage, the circuit can be automatically switched off, so that the battery module is prevented from being overcharged and damaged.

Description

technical field [0001] The invention relates to the field of relays, in particular to a battery module precharging, overvoltage and overcurrent protection circuit and method. Background technique [0002] The current battery module circuit relay scheme is that the positive pole of the battery module is first connected to the fuse, and then connected to the positive pole of the main relay, and then the negative pole of the main relay is the positive pole of the power terminal; at the same time, the pre-charging resistor is connected in series with the pre-charging relay Finally, it should be connected in parallel with the main relay. [0003] The circuit diagram of the existing battery module relay scheme is as follows: figure 1 shown. When the battery module starts to work, the pre-charging relay is first turned on, and when the pre-charging of the capacitor at the power end reaches the target value, the main relay is turned on again, and after the main relay works stably,...

AI Technical Summary

Problems solved by technology

[0008] However, when an accidental overcurrent occurs in the working circuit of the battery module, the current in the circuit increases at this time, and the fuse may reach the fusing condition due to exceeding the working current and be damaged. If the working circuit of the battery module is checked and repaired, it needs to be re- At this time, the fuse needs to be replaced again. The fuse cannot be used again due to overcurrent or blown. When the battery module is overvoltage, the main relay needs to be disconnected through the control circuit. Open to protect the battery module

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