Battery high-voltage circuit breaking unit

Abstract

The utility model relates to the technical field of new energy automobile power batteries, in particular to a battery high-voltage circuit breaking unit. Comprising a BDU upper shell, a BDU lower shell, a BMS mainboard arranged between the BDU upper shell and the BDU lower shell, a BDU module arranged on the BMS mainboard, a copper bar which is parallel to the BMS mainboard and is in contact with the BDU module for heat dissipation, and a heat dissipation plate which is arranged at the lower end of the BDU lower shell and is in contact with the copper bar through a heat-conducting medium. The BDU module comprises a pre-charging resistor, a pre-charging relay, a heating relay, a heating fuse and a main fuse which are integrated on the BMS main board, and a main relay welded or inserted on the BMS main board; according to the utility model, all the devices in the BDU are integrated, welded or inserted on the BMS mainboard, so that the parts required for internal installation are simplified, and complete zero wiring harness in the BDU is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicle power batteries, and specifically to a battery high-voltage circuit breaker unit. Background Art

[0002] At present, the space conflict inside the battery pack is becoming increasingly prominent. How to make the most effective use of the internal space of the battery pack is the breakthrough direction that all new energy OEMs focus on. According to the definition of the car model by the car company, different models have different charging and discharging currents, and the corresponding relay selection specifications need to meet the requirements of the use specification. The larger the specification of the relay, the higher the cost. Some electrical principles use 3-4 relays, which has a greater cost conflict on power management.

[0003] The energy management system inside the traditional battery pack is divided into the energy disconnect unit (BDU) and the battery management system (BMS). The BMS can closely monitor, control and distribute the reliable charging and discharging of the entire battery system during its service life. Each sampling point of the main relay in the BDU corresponds to a connector, and the control harness corresponds to multiple connectors, which is a major challenge to the stability and reliability of the product.

[0004] Therefore, how to highly integrate the energy circuit breakers and battery management systems in the battery pack, reduce the number of unnecessary wiring harnesses in the battery pack, and design a stable and reliable heat dissipation module are issues that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The purpose of the present utility model is to provide a battery high voltage circuit breaker unit to solve the above problems, so as to solve the problems raised in the background technology.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] The utility model proposes a battery high-voltage circuit breaker unit, comprising a BDU upper shell and a BDU lower shell, a BMS mainboard arranged between the two, a BDU module arranged on the BMS mainboard, a copper bar arranged in parallel with the BMS mainboard and in contact with the BDU module for heat dissipation, and a heat dissipation plate arranged at the lower end of the BDU lower shell and in contact with the copper bar through a heat-conducting medium;

[0008] The BDU module includes a pre-charge resistor, a pre-charge relay, a heating relay, a heating fuse and a main fuse integrated on the BMS mainboard, and a main relay welded or plugged on the BMS mainboard.

[0009] Furthermore, an L-shaped recessed portion is provided at a corner of one side of the BDU lower shell, and the L-shaped recessed portion is composed of two mutually perpendicular recessed surfaces. The heat sink is L-shaped and its shape matches the L-shaped recessed portion, and is embedded or installed in the L-shaped recessed portion.

[0010] Furthermore, a serrated heat dissipation portion is provided on the back side of at least one side of the heat dissipation plate.

[0011] Furthermore, the heat sink is specifically one of an aluminum plate, a copper plate, and an iron plate.

[0012] Furthermore, the BDU module also includes a main fuse and a shunt which are arranged on the copper bus and welded or plugged onto the BMS mainboard.

[0013] Furthermore, mounting feet are fixedly provided at both ends of the copper busbar, and the mounting feet extend to the outside of the high-voltage circuit breaker unit, so as to install the high-voltage circuit breaker unit in the battery pack.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model integrates, welds, or plugs the components inside the BDU on the BMS mainboard, simplifies the components required for internal installation, and realizes a completely zero wiring harness inside the BDU.

[0016] 2. The utility model adopts an L-shaped heat sink to dissipate heat through the contact between the heat-conducting medium and the copper busbar, and the L-shaped heat sink is matched with an L-shaped recessed portion provided at a corner on one side of the lower shell of the BDU for installation. While the heat dissipation effect is improved through the serrated heat dissipation portion on the back side, the integrity of the external structure of the energy circuit breaker unit is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the energy circuit breaker unit in the utility model.

[0018] Figure 2 It is an exploded schematic diagram of the overall structure of the energy circuit breaker unit in the utility model.

[0019] Figure 3 It is a structural schematic diagram of the heat dissipation plate in the utility model.

[0020] Figure 4 It is an assembly schematic diagram of the heat dissipation plate in the utility model.

[0021] In the figure: 1. BDU upper shell; 2. BMS mainboard; 3. Pre-charging resistor; 4. Pre-charging relay; 5. Heating relay; 6. Heating fuse; 7. Copper busbar; 8. Shunt; 9. Main fuse; 10. Main relay; 11. BDU lower shell; 12. Heat transfer medium; 13. Heat sink; 14. Mounting foot; 111. L-shaped recessed portion; 131. Sawtooth heat dissipation portion. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example 1

[0024] like Figure 1-4 As shown, this embodiment proposes a battery high-voltage circuit breaker unit, including a BDU upper shell 1 and a BDU lower shell 11, and a BMS mainboard 2 arranged therebetween, and a BDU module arranged on the BMS mainboard 2, and a copper bar 7 arranged in parallel with the BMS mainboard 2 and in contact with the BDU module for heat dissipation, and a heat sink 13 arranged at the lower end of the BDU lower shell 11 and in contact with the copper bar 7 through a heat-conducting medium 12; the BDU module includes a pre-charging resistor 3, a pre-charging relay 4, a heating relay 5, a heating fuse 6 and a main fuse 9 integrated on the BMS mainboard 2, and a main relay 10 welded or plugged on the BMS mainboard 2. The BDU module also includes a main fuse 9 and a shunt 8 arranged on the copper bar 7 and welded or plugged on the BMS mainboard 2.

[0025] The battery high-voltage circuit unit proposed in this embodiment makes the internal devices of the BDU further highly integrated. By integrating, welding, or plugging the BDU module on the BMS main board (PCB board), the components required for internal installation (such as the wiring harnesses that need to connect the components, the wiring harnesses of each sampling point, connectors, component mounting screws, etc.) are simplified.

[0026] In some optional embodiments, the BDU module may also be set on the BMS mainboard by fastener connection or crimping.

[0027] More specifically, the pre-charge resistor 3, the pre-charge relay 4, the heating fuse 6, and the heating relay 5 are integrated into the BMS-PCB (BMS main board 2), and the main relay 10 is connected to the control circuit of the main relay 10 on the BMS main board 2 by means of connectors or welding. The high-voltage sampling points of each contact of the main relay are also connected to the BMS main board by means of connectors or welding, so that all controls can be realized, and the sampling circuits are directly connected to the BMS main board, realizing a complete 0 wiring harness inside the BDU.

[0028] Combination Figure 4 Further preferably, an L-shaped recessed portion 111 is provided at a corner of one side of the BDU lower shell 11, and the L-shaped recessed portion 111 is composed of two mutually perpendicular recessed surfaces, and the heat sink 13 is L-shaped and its shape matches the L-shaped recessed portion 111, and is embedded or installed in the L-shaped recessed portion 111. A sawtooth heat sink 131 is provided on the back of at least one side of the heat sink 13.

[0029] In some optional embodiments, the recessed portion at the side corner of the BDU lower shell 11 and the heat sink can be elongated or square. In addition, when the heat sink has multiple back sides, both sides, three sides or more back sides of the heat sink 13 are provided with heat sinks, and in optional embodiments, the heat sink is not limited to a serrated structure, such as a fin-type heat sink structure, a dispensing heat sink structure, a graphene heat sink structure, etc.

[0030] More preferably, the heat sink 13 is specifically one of an aluminum plate, a copper plate, and an iron plate.

[0031] It can be understood that in this embodiment, the heat generated by the relay in the BDU module due to the excessive current is introduced to the heat dissipation plate 13 through the copper bar 7 in contact with the heat-conducting medium (thermal conductive gel, thermal conductive mud and thermal conductive potting glue, etc. can be selected). The sawtooth heat dissipation portion 131 is tooth-shaped, which effectively increases the heat dissipation area, providing a good heat dissipation channel for the relay and other heat-generating devices.

[0032] Further preferably, mounting feet 14 are fixedly provided at both ends of the copper busbar 7, and the mounting feet 14 extend to the outside of the high-voltage circuit breaker unit for installing the high-voltage circuit breaker unit in the battery pack. This embodiment does not limit the installation direction of the mounting feet.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery high voltage circuit breaker unit, characterized in that: The device comprises a BDU upper shell (1) and a BDU lower shell (11), a BMS mainboard (2) arranged therebetween, a BDU module arranged on the BMS mainboard (2), a copper bar (7) arranged in parallel with the BMS mainboard (2) and in contact with the BDU module for heat dissipation, and a heat dissipation plate (13) arranged at the lower end of the BDU lower shell (11) and in contact with the copper bar (7) via a heat conducting medium (12); The BDU module comprises a pre-charging resistor (3), a pre-charging relay (4), a heating relay (5), a heating fuse (6) and a main fuse (9) integrated on a BMS mainboard (2), and a main relay (10) welded or plugged on the BMS mainboard (2).

2. A battery high voltage circuit breaker unit according to claim 1, characterized in that: An L-shaped recessed portion (111) is provided at a corner of one side of the BDU lower shell (11); the L-shaped recessed portion (111) is composed of two mutually perpendicular recessed surfaces; the heat sink (13) is L-shaped and its shape matches the L-shaped recessed portion (111), and is embedded or installed in the L-shaped recessed portion (111).

3. A battery high voltage circuit breaker unit according to claim 2, characterized in that: A sawtooth heat dissipation portion (131) is provided on the back side of at least one side of the heat dissipation plate (13).

4. A battery high voltage circuit breaker unit according to claim 3, characterized in that: The heat dissipation plate (13) is specifically one of an aluminum plate, a copper plate, and an iron plate.

5. A battery high voltage circuit breaker unit according to claim 1, characterized in that: The BDU module also includes a main fuse (9) and a shunt (8) which are arranged on the copper busbar (7) and welded or plugged onto the BMS mainboard (2).

6. A battery high voltage circuit breaker unit according to claim 1, characterized in that: Mounting feet (14) are fixedly provided at both ends of the copper busbar (7), and the mounting feet (14) extend to the outside of the high-voltage circuit breaker unit and are used to install the high-voltage circuit breaker unit in the battery pack.

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