Battery pack protection device

Abstract

The utility model provides a battery pack protection device which comprises a battery pack body, a direct current micro breaker and a charger, the positive electrode of the battery pack body is connected with the output positive electrode of the charger through the direct current micro breaker, and the negative electrode of the battery pack body is connected with the negative electrode of the charger through the direct current micro breaker. By using the battery pack protection device, through the connection and cooperation of the battery pack body, the direct-current micro breaker and the charger, when a relay at the battery end of the charger is damaged, the output voltage becomes high, the direct-current micro breaker detects that the Vpack voltage is too high, and the positive pole loop is directly disconnected, so that the battery of the battery pack body is protected. If the above measures cannot perform protection, the charger continues to charge the battery at the moment, and due to information interaction between the direct-current micro breaker and the BMS board, when the trigger voltage of the battery pack body is overvoltage, the direct-current micro breaker disconnects the positive pole loop, so that the battery of the battery pack body is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly to a battery pack protection device. Background Art

[0002] Lithium batteries are increasingly widely used in our lives, and the service life of the battery affects the service life of electronic products.

[0003] Currently, a charger is needed to charge the battery pack. During charging, if the charger battery terminal relay is damaged, a very high voltage will be input to the battery pack. At this time, the MOSFET tube of the battery pack BMS (Battery Management System) board may be damaged, and then the charging and discharging circuit cannot be cut off. Therefore, the charger continues to charge the battery pack, resulting in overcharging and damage of the battery pack finally. In severe cases, the battery pack may catch fire, endangering personal safety and property safety. Summary of the Utility Model

[0004] To solve the above problems, the utility model adopts the following technical scheme: A battery pack protection device, comprising: a battery pack body, a DC micro breaker, and a charger. The positive electrode of the battery pack body is connected to the output positive electrode of the charger through the DC micro breaker, and the negative electrode of the battery pack body is connected to the negative electrode of the charger through the DC micro breaker.

[0005] Further, the battery pack body has a BMS board, and the BMS board performs information interaction with the DC micro breaker through RS485 and CAN communication.

[0006] Further, the DC micro breaker communicates with the charger through RS485 and CAN communication.

[0007] Further, the DC micro breaker is a non-polar DC micro breaker.

[0008] Further, the DC micro breaker is used to detect the Vpack voltage in real time.

[0009] Further, the DC micro breaker includes a housing, an upper terminal, a lower terminal, an operating handle, an overload protection mechanism, a moving contact, a magnetic coil, and an arc extinguishing grid. The interior of the housing has a cavity. Part of the operating handle is located outside the housing, and the other part is located in the cavity. The upper terminal is used for wiring with an external circuit, and the upper terminal is connected to the overload protection mechanism. The overload protection mechanism is movably connected to the moving contact. The lower terminal is used for wiring with an external circuit, and the lower terminal is connected to the magnetic coil. The magnetic coil is movably connected to the moving contact. The arc extinguishing grid is arranged in the cavity.

[0010] Further, the overload protection mechanism is a bimetallic strip.

[0011] Further, a locking groove is formed on the outer side of the housing, and the locking groove is used for connecting with an external connecting guide rail.

[0012] Further, the DC miniature circuit breaker further includes a static contact, and the arc extinguishing grid is located on one side of the static contact and the moving contact.

[0013] The beneficial effects of the present utility model are as follows: When using this battery pack protection device, through the connection and cooperation of the battery pack body, the DC miniature circuit breaker and the charger, when the relay at the battery end of the charger is damaged, the output voltage becomes higher. The DC miniature circuit breaker detects that the Vpack voltage is too high and directly disconnects the positive circuit, thereby protecting the battery of the battery pack body. If the above measures cannot provide protection, at this time, the charger will continue to charge the battery. Since there is information interaction between the DC miniature circuit breaker and the BMS board, when the battery pack body triggers overvoltage, the DC miniature circuit breaker disconnects the positive circuit, thereby protecting the battery of the battery pack body. Description of the Drawings

[0014] The drawings further illustrate the present utility model, but the embodiments in the drawings do not constitute any limitation to the present utility model.

[0015] Figure 1 It is a schematic diagram of the circuit connection of a battery pack protection device provided for an embodiment;

[0016] Figure 2 It is a schematic diagram of the internal structure of a DC miniature circuit breaker provided for an embodiment. Detailed Embodiment

[0017] The following will further describe the technical solutions of the present utility model with reference to the drawings of the embodiments of the present utility model. The present utility model is not limited to the following specific embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0018] As Figures 1 to 2 shown, a battery pack protection device includes: a battery pack body, a DC miniature circuit breaker and a charger. The positive electrode of the battery pack body is connected to the output positive electrode of the charger through the DC miniature circuit breaker, and the negative electrode of the battery pack body is connected to the negative electrode of the charger through the DC miniature circuit breaker.

[0019] Specifically, the battery pack body has a BMS board, and the BMS board exchanges information with the DC breaker through RS485 and CAN communications. The DC breaker communicates with the charger through RS485 and CAN communications. The DC breaker is a non-polar DC breaker. The DC breaker is used to detect the Vpack voltage in real time. The DC breaker includes a housing 100, an upper terminal 200, a lower terminal 300, an operating handle 400, an overload protection mechanism 500, a moving contact 600, a magnetic coil 700, and an arc extinguishing grid 800. The interior of the housing 100 has a cavity 101. A part of the operating handle 400 is located outside the housing 100, and another part is located inside the cavity 101. The upper terminal 200 is used for wiring with an external circuit, and the upper terminal 200 is connected to the overload protection mechanism 500. The overload protection mechanism 500 is movably connected to the moving contact 600. The lower terminal 300 is used for wiring with an external circuit, and the lower terminal 300 is connected to the magnetic coil 700. The magnetic coil 700 is movably connected to the moving contact 600. The arc extinguishing grid 800 is disposed inside the cavity 101. The overload protection mechanism 500 is a bimetallic strip. A locking groove 102 is formed on the outside of the housing 100, and the locking groove 102 is used for connecting with an external connection guide rail. The DC breaker further includes a static contact, and the arc extinguishing grid 800 is located on one side of the static contact and the moving contact 600.

[0020] That is to say, when using this battery pack protection device, the positive electrode of the battery pack body is connected to the DC breaker and then connected to the output positive electrode of the charger. The negative electrode of the battery pack body is connected to the DC breaker and the charger. That is, the BMS board can directly exchange information with the DC breaker through RS485 and CAN communications. It is worth mentioning that the DC breaker and the charger also use RS485 and CAN communications. Therefore, when the relay at the battery end of the charger is damaged, the output voltage becomes higher. The DC breaker detects that the Vpack voltage is too high and directly disconnects the positive electrode circuit, thereby protecting the battery of the battery pack body. If the above measures cannot provide protection, at this time, the charger will continue to charge the battery. Since the DC breaker and the BMS board have information interaction, when the battery pack body triggers overvoltage, the DC breaker disconnects the positive electrode circuit, thereby protecting the battery of the battery pack body.

[0021] In one embodiment, due to the provision of the arc extinguishing grid 800, by changing the opening distance between the moving contact 600 and the static contact, and thus shortening the arc jumping distance and increasing the arc ignition coil, when the DC arc passes through the arc extinguishing grid 800, the arc extinguishing grid 800 can cut the arc into small arcs, thereby cutting off the fault. Therefore, it has higher arc extinguishing ability and higher reliability.

[0022] In summary, the above-described embodiments are not restrictive embodiments of the present utility model. Any modification or equivalent deformation made by those skilled in the art on the basis of the substantial content of the present utility model falls within the technical scope of the present utility model.

Claims

1. A battery pack protection device, characterized in that: include: A battery pack body, a DC micro-breaker and a charger, wherein the positive pole of the battery pack body is connected to the output positive pole of the charger through the DC micro-breaker, and the negative pole of the battery pack body is connected to the negative pole of the charger through the DC micro-breaker.

2. The battery pack protection device according to claim 1, characterized in that: The battery pack body has a BMS board, and the BMS board exchanges information with the DC micro-breaker through RS485 and CAN communications.

3. The battery pack protection device according to claim 2, characterized in that: The DC micro-breaker communicates with the charger via RS485 and CAN communications.

4. The battery pack protection device according to claim 1, characterized in that: The DC micro-breaker is a non-polarity DC micro-breaker.

5. The battery pack protection device according to claim 1, characterized in that: The DC micro-breaker is used to detect the Vpack voltage in real time.

6. The battery pack protection device according to claim 1, characterized in that: The DC micro-breaker includes a shell, an upper terminal, a lower terminal, an operating handle, an overload protection mechanism, a moving contact, a magnetic coil and an arc extinguishing grid. The shell has a cavity inside. The operating handle is partially located on the outside of the shell, and the other part is located in the cavity. The upper terminal is used for wiring with an external circuit, and the upper terminal is connected to the overload protection mechanism, and the overload protection mechanism is movably connected to the moving contact. The lower terminal is used for wiring with an external circuit, and the lower terminal is connected to the magnetic coil, and the magnetic coil is movably connected to the moving contact. The arc extinguishing grid is arranged in the cavity.

7. The battery pack protection device according to claim 6, characterized in that: The overload protection mechanism is a bimetallic strip.

8. The battery pack protection device according to claim 7, characterized in that: A locking groove is provided on the outside of the shell, and the locking groove is used to connect with an external connecting guide rail.

9. The battery pack protection device according to claim 8, characterized in that: The DC micro-breaker also includes a static contact, and the arc extinguishing grid is located on one side of the static contact and the moving contact.

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