Novel battery pack manual maintenance switch

Abstract

The utility model discloses a novel battery pack manual maintenance switch comprising an MSD assembly which is provided with a switch. The MSD assembly is connected with the BMS, and the switch is connected with the pre-charging relay and the main positive relay; the pre-charging relay is connected with the pre-charging resistor; the main positive relay is connected with the pre-charging resistor; the switch is connected with a battery voltage, and the battery voltage is connected with the cathode relay. The utility model has the beneficial effects that the MSD is designed in the PACK main loop, the plug is internally provided with the fuse and the copper plate, the plug and the socket jointly form a high-voltage interlocking loop, and if extreme over-current and short-circuit working conditions occur outside the whole vehicle, the built-in fuse cuts off the high-voltage loop; when the high-voltage circuit of the whole vehicle is maintained, the high voltage can be manually disconnected, the high-voltage interlocking is disconnected firstly, then the high-voltage loop is disconnected to ensure that the BMS cannot detect the high-voltage interlocking information, and misoperation of high-voltage power-on is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile batteries, in particular to a novel manual maintenance switch for a battery pack. Background Art

[0002] The emergency maintenance switch, also known as the emergency stop switch or maintenance switch, is used to disconnect high voltage power in emergencies or during vehicle maintenance. The maintenance switch can be found in a variety of locations in electric vehicles, including the central armrest, the rear armrest, the glove compartment, and above the power battery assembly. Depending on the vehicle model, please refer to the vehicle maintenance manual for instructions.

[0003] The maintenance switch is widely installed in electric vehicles, including in the center or rear armrest, in the glove box, and above the power battery assembly. Depending on the vehicle model, you'll need to follow the instructions in the vehicle's maintenance manual to locate it.

[0004] The maintenance switch has different names: Manual Service Disconnect (MSD) and Emergency Service Switch (ESS). There are generally two types of electrical layouts for the maintenance switch: one is located at the positive pole of the high-voltage power supply, and the other is arranged in the middle of the power battery assembly. The maintenance switch is located at the positive pole of the power battery, and there is a circuit between the positive pole of the power battery and the maintenance switch. If this type of layout is used, it is necessary to ensure that this circuit is in an area that cannot be touched by human body (usually inside the power battery assembly).

[0005] According to GB / T 19751-2005 "Safety Requirements for Hybrid Electric Vehicles", if the high-voltage connector can be disconnected without tools, it must meet the IPXXB protection level requirements when not mated, that is, prevent direct finger contact. Therefore, the base jack of the maintenance switch should be designed according to the IPXXB protection level.

[0006] Therefore, a new manual maintenance switch for battery pack is proposed. Summary of the Invention

[0007] The purpose of the present utility model is to provide a new manual maintenance switch for a battery pack to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A novel manual maintenance switch for a battery pack includes an MSD assembly, wherein the MSD assembly is provided with a switch;

[0010] The MSD assembly is connected to the BMS, and the switch is connected to the pre-charge relay and the main positive relay;

[0011] The pre-charge relay is connected to the pre-charge resistor;

[0012] The main positive relay is connected to the pre-charging resistor;

[0013] The switch is connected to the battery voltage, and the battery voltage is connected to the negative electrode relay.

[0014] Furthermore, it includes resistors and capacitors.

[0015] Furthermore, the pre-charging resistor is connected to the Bat+ terminal of the capacitor.

[0016] Furthermore, the main positive relay is connected to the Bat+ terminal of the capacitor.

[0017] Furthermore, the negative relay is connected to the Bat- terminal of the capacitor.

[0018] Furthermore, the resistors are connected to the Bat+ terminal and the Bat- terminal of the capacitor respectively.

[0019] Furthermore, the MSD assembly is made of PA66-GFXX.

[0020] Furthermore, when the pre-charge rear end voltage is ≥95% of the PACK voltage, the main positive relay is closed.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The MSD is designed into the main circuit of the PACK. The plug has a built-in fuse and copper plate. The plug and socket together form a high-voltage interlock circuit. If extreme overcurrent or short-circuit conditions occur outside the vehicle, the built-in fuse will cut off the high-voltage circuit.

[0023] When maintaining the high-voltage circuit of the entire vehicle, the high voltage can be manually disconnected. The high-voltage interlock is disconnected first, and then the high-voltage circuit is disconnected to ensure that the BMS cannot detect the high-voltage interlock information to prevent accidental operation of high-voltage power-on. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Added MSD battery electrical schematic diagram;

[0025] Figure 2 Flowchart for powering up the battery. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Example

[0027] See also Figure 1-2 , the utility model provides a technical solution:

[0028] A new type of manual battery pack maintenance switch includes an MSD assembly with a switch. The MSD assembly is connected to the BMS, and the switch is connected to the pre-charge relay and the main positive relay. The pre-charge relay is connected to the pre-charge resistor. The main positive relay is connected to the pre-charge resistor. The switch is connected to the battery voltage, and the battery voltage is connected to the negative relay. It also includes resistors and capacitors.

[0029] Connect the pre-charge resistor to the Bat+ terminal of the capacitor. Connect the main positive relay to the Bat+ terminal of the capacitor. Connect the negative relay to the Bat- terminal of the capacitor. Connect the resistors to the Bat+ and Bat- terminals of the capacitor. The MSD assembly is made of PA66-GFXX. The main positive relay closes when the pre-charge voltage is ≥ 95% of the pack voltage.

[0030] How it works:

[0031] The fuse is integrated into the MSD, and the high-voltage interlock also exists at the same time, which plays the role of a switch in the battery electrical principle. When the MSD is fully connected, the MSD switch is closed, and the BMS detects that there is no abnormality in the MSD connection. It closes the main negative relay first, and then closes the pre-charge relay. When the pre-charge rear end voltage ≥ PACK voltage 95%, the main positive relay is closed; if the MSD switch is not fully connected, the BMS prohibits high-voltage power-on.

[0032] During the power-on process, if the BMS does not detect the existence of the MSD, a level 4 fault will be reported and high voltage will be prohibited.

[0033] The MSD assembly includes interlocking parts such as the contact copper plate, interlocking device, plug, fuse, copper plate, interlocking device, seals, etc., and the protection level must reach IP67. The MSD is integrated with the power battery connector.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of manual maintenance switch for battery packs, including an MSD assembly, characterized by: The MSD assembly is provided with a switch; The MSD assembly is connected to the BMS, and the switch is connected to the pre-charge relay and the main positive relay; The pre-charge relay is connected to the pre-charge resistor; The main positive relay is connected to the pre-charging resistor; The switch is connected to the battery voltage, and the battery voltage is connected to the negative electrode relay.

2. A novel manual maintenance switch for battery packs according to claim 1, characterized in that: Including resistors and capacitors.

3. A novel manual maintenance switch for battery packs according to claim 2, characterized in that: The pre-charging resistor is connected to the Bat+ terminal of the capacitor.

4. The novel manual maintenance switch for battery pack according to claim 2 is characterized in that: The main positive relay is connected to the Bat+ terminal of the capacitor.

5. The novel manual maintenance switch for battery pack according to claim 2 is characterized in that: The negative relay is connected to the Bat- terminal of the capacitor.

6. The novel manual maintenance switch for battery pack according to claim 2 is characterized in that: The resistors are connected to the Bat+ terminal and the Bat- terminal of the capacitor respectively.

7. The novel manual maintenance switch for battery pack according to claim 1 is characterized in that: The MSD assembly is made of PA66-GFXX.

8. The novel manual maintenance switch for battery pack according to claim 1 is characterized in that: When the precharge rear end voltage ≥ PACK voltage 95%, the main positive relay is closed.

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