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Protection circuit, battery management system and battery pack

A technology for protecting circuits and battery packs. It is applied in the direction of safety/protection circuits, circuit devices, transportation and packaging, etc. It can solve problems such as potential safety hazards, damage to battery packs or loads, and failure of fuses to be blown to reduce potential safety hazards. Effect of protecting battery pack and load

Pending Publication Date: 2021-10-08
DONGGUAN POWERAMP TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the switching device in the BMS circuit fails, the on-resistance in the BMS circuit will be uncertain, and when the on-resistance is too high, the fuse cannot be blown, which will cause damage to the battery pack or load , a great security risk

Method used

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  • Protection circuit, battery management system and battery pack
  • Protection circuit, battery management system and battery pack
  • Protection circuit, battery management system and battery pack

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Embodiment Construction

[0049] In order to make the purpose, technical solution and points of the embodiment of the application clearer, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the drawings in the embodiment of the application. Obviously, the described embodiment It is only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0050] In the context of the embodiments of the present application, the term "comprising" and its variants can be understood as open-ended terms that mean "including but not limited to"; the term "based on" can be understood as "at least in part based on"; the term "one embodiment" may be read as "at least one embodiment"; the term "another embodiment" may be r...

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Abstract

The invention relates to a protection circuit, a battery management system and a battery pack. The protection circuit comprises a first switch unit, a fuse, a second switch unit and a main control unit, wherein the first switch unit is connected in series between the battery pack and a load and is used for connecting or disconnecting the battery pack and the load; the main control unit is used for judging a failure state of the first switch unit and / or the battery pack and controlling the second switch unit to be switched on or switched off according to the judgment result; and when the protection circuit is triggered for protection, the fuse is fused to break the connection between the load and the battery pack. In the protection circuit, after the first switch unit and / or the battery pack fails, the battery pack and the load can be disconnected by the second switch unit, so that the purpose of protecting the battery pack and the load is achieved, and potential safety hazards are reduced.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a protection circuit, a battery management system and a battery pack. Background technique [0002] In recent years, with the rapid development of new energy technology, the application of battery packs has also been increasing. Since battery packs are prone to failure due to overheating, overvoltage, external shocks (such as accidents) or other reasons, it is usually necessary to use batteries Management System (Battery Management System, BMS) to ensure the safety of the battery pack during use. [0003] At present, when a fault occurs, fuses and switching devices in the BMS circuit are usually used to disconnect the charging and discharging of the battery pack in time to achieve the purpose of protecting the battery pack or load. However, when the switching device in the BMS circuit fails, the on-resistance in the BMS circuit will be uncertain, and when the...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0031H02J7/0063H02J7/00309H02J7/00308
Inventor 张晨秦友强林泽钦
Owner DONGGUAN POWERAMP TECH LTD
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