CN216055936U

CN216055936U - High-voltage distribution box circuit for power battery

Info

Publication number: CN216055936U
Application number: CN202122080439.8U
Authority: CN
Inventors: 李德斌
Original assignee: Lanzhou Guangtong New Energy Automobile Co ltd
Current assignee: Lanzhou Guangtong New Energy Automobile Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-15
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a high-voltage distribution box circuit for a power battery, which comprises a charging positive circuit, a charging negative circuit, a DC-DC power supply module and a cooling fan power supply interface, wherein the charging positive circuit and the charging negative circuit are connected with the cooling fan power supply interface through the DC-DC power supply module, the charging positive circuit outputs a positive power supply output interface, and the charging negative circuit outputs a negative power supply output interface. The high-voltage relay and the maintenance switch which adopt large current reserve two direct current charging interfaces and are suitable for single gun or double gun charging and discharging scenes of different types of power batteries, the fault rate is low, the maintenance is convenient, each interface adopts an aviation quick-plug high-voltage connector, the difficulty of field installation of a high-voltage wire harness is effectively reduced, and the convenience of follow-up dismounting of the high-voltage wire harness is realized.

Description

High-voltage distribution box circuit for power battery

Technical Field

The utility model relates to the technical field of high-voltage distribution box circuits, in particular to a high-voltage distribution box circuit for a power battery.

Background

With the gradual shortage of energy, the continuous development and progress of new energy automobiles become the development direction of various modern large automobile factories. The new energy automobile can solve the energy problem and the environmental problem for people, and provides a convenient vehicle for people to go out daily.

Three core components of the new energy automobile, namely batteries, motors and electric control, are important breakthrough points for developing the new energy automobile, and a power battery system also becomes a key factor for restricting the development of the new energy automobile; a high-voltage distribution box, which is one of the key components in a power battery system, will also become an important concern. The high-voltage distribution box has the main functions of summarizing the capacity of each power battery pack and has the current and voltage acquisition function; managing high-voltage power distribution to realize respective control of input and output of each path; monitoring the connection state and the insulation state of the internal high-voltage relay in real time; the safety management of the high-voltage system has the functions of overcurrent, overvoltage and overtemperature protection and the function of cutting off the high voltage when a vehicle is collided and overturned; the CAN communication function is provided, and data CAN be exchanged with each battery pack and the whole vehicle in real time.

The traditional high-voltage distribution box has the problems that the product universality is poor, the internal expansion port is few, the distribution box needs to be designed according to the distribution requirement of a corresponding vehicle type, the whole distribution box needs to be redesigned when relevant technical parameters are replaced and electric device manufacturers and models are replaced, the time of mass production of products is long, and the loading time is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a high voltage distribution box circuit for a power battery.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

the embodiment of the utility model provides a high-voltage distribution box circuit for a power battery, which comprises a charging positive circuit, a charging negative circuit, a DC-DC power supply module and a cooling fan power supply interface, wherein the charging positive circuit and the charging negative circuit are connected with the cooling fan power supply interface through the DC-DC power supply module, the charging positive circuit outputs a positive power supply output interface, and the charging negative circuit outputs a negative power supply output interface.

Preferably, the charge positive electrode circuit includes an MSD fast switch, a main positive relay, a first relay, a second relay, a first fuse, a second fuse, a third fuse and a fourth fuse, the output end of the MSD fast-maintenance switch is connected with the positive input end of the vehicle-mounted power battery, the input end of the MSD fast-maintenance switch is respectively connected with one end of the main positive relay, one end of the first relay, one end of the second relay, one end of the fourth fuse and one end of the DC-DC power module, the other end of the main positive relay is connected with a first fuse in series and then is connected with a positive power supply output interface, the other end of the first relay is connected with the second fuse in series and then is connected with the first direct current positive charging interface, the other end of the second relay is connected with the third fuse in series and then is connected with a second direct-current positive electrode charging interface, and the other end of the fourth fuse is connected with a top charging positive electrode reserved interface.

Preferably, the charging negative electrode circuit comprises a current sensor, a main negative relay, a third relay and a fourth relay, wherein the output end of the main negative relay is connected with the negative electrode input end of the vehicle-mounted power battery, the input end of the main negative relay is respectively connected with one end of the DC-DC power supply module, one end of the third relay, one end of the fourth relay, the top charging negative electrode reserved interface and the negative electrode power supply output interface, the other end of the third relay is connected with the first direct current negative electrode charging interface, and the other end of the fourth relay is connected with the second direct current negative electrode charging interface.

Preferably, the rated current of the main positive relay is 300A, and the rated current of the main negative relay is 600A.

Preferably, the rated current of the first relay, the second relay, the third relay and the fourth relay is 300A.

In the present invention, the rated current of the first fuse is 300A, the rated current of the second fuse is 300A, the rated current of the third fuse is 300A, and the rated current of the fourth fuse is 600A.

Compared with the prior art, the high-voltage relay and the maintenance switch which adopt large current reserve two direct current charging interfaces and are suitable for single gun or double gun charging and discharging scenes of different types of power batteries, the fault rate is low, the maintenance is convenient, each interface adopts aviation fast-plugging high-voltage connectors, the difficulty of on-site installation of high-voltage wire harnesses is effectively reduced, and the convenience of follow-up dismounting of the high-voltage wire harnesses is realized.

Drawings

Fig. 1 is a schematic structural diagram of a high voltage distribution box circuit for a power battery according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The embodiment of the utility model provides a high-voltage distribution box circuit for a power battery, which comprises a charging positive circuit, a charging negative circuit, a DC-DC power module 23 and a cooling fan power interface 24, wherein the charging positive circuit and the charging negative circuit are connected with the cooling fan power interface 24 through the DC-DC power module 23, the charging positive circuit outputs a positive power output interface 5, and the charging negative circuit outputs a negative power output interface 17, as shown in figure 1.

Preferably, the charging positive electrode circuit comprises an MSD fast switch 2, a main positive relay 3, a first relay 6, a second relay 7, a first fuse 4, a second fuse 8, a third fuse 9 and a fourth fuse 10, an output end of the MSD fast switch 2 is connected with a positive electrode input end 1 of the vehicle-mounted power battery, an input end of the MSD fast switch 2 is respectively connected with one end of the main positive relay 3, one end of the first relay 6, one end of the second relay 7, one end of the fourth fuse 10 and one end of a DC-DC power module 23, the other end of the main positive relay 3 is connected with the positive electrode power output interface 5 after being connected with the first fuse 4 in series, the other end of the first relay 6 is connected with the first DC positive electrode charging interface 11 after being connected with the second fuse 8 in series, the other end of the second relay 7 is connected with the second DC positive electrode charging interface 12 after being connected with the third fuse 9 in series, the other end of the fourth fuse 10 is connected with a top charging anode reserved interface 13.

Preferably, the charging negative circuit comprises a current sensor 15, a main negative relay 16, a third relay 18 and a fourth relay 19, an output end of the main negative relay 16 is connected with a negative input end 14 of the vehicle-mounted power battery, an input end of the main negative relay 16 is respectively connected with one end of a DC-DC power module 23, one end of the third relay 18, one end of the fourth relay 19, a top charging negative reserved interface 22 and a negative power output interface 17, the other end of the third relay 18 is connected with a first direct current negative charging interface 20, and the other end of the fourth relay 19 is connected with a second direct current negative charging interface 21.

Preferably, the rated current of the main positive relay 3 is 300A, and the rated current of the main negative relay 16 is 600A.

Preferably, the rated current of the first relay 6, the second relay 7, the third relay 18 and the fourth relay 19 is 300A.

In the present invention, the rated current of the first fuse 4 is 300A, the rated current of the second fuse 8 is 300A, the rated current of the third fuse 9 is 300A, and the rated current of the fourth fuse 10 is 600A.

The working principle of the utility model is as follows:

as shown in fig. 1, the input end of the high-voltage distribution box circuit includes a first DC positive charging interface 11 and a first DC negative charging interface 20 as a set, a second DC positive charging interface 12 and a second DC negative charging interface 21 as a set, a top charging positive reserved interface 13 and a top charging negative reserved interface 22 as a set, and can be charged by a single gun, a double gun and a top charging mode, and the DC-DC power module can realize self-diagnosis and monitoring for 24 hours, the positive power output interface 5 and the negative power output interface 17 can charge the vehicle-mounted low-voltage storage battery, and the cooling fan power interface 24 is used for supplying power to the air-cooling fan of the vehicle-mounted power battery box to cool the power battery.

According to the utility model, the high-voltage relay and the maintenance switch with large current are adopted, two direct current charging interfaces are reserved and are suitable for single-gun or double-gun charging and discharging scenes of different types of power batteries, the fault rate is low, the maintenance is convenient, each interface adopts an aviation fast-plugging high-voltage connector, the difficulty of field installation of a high-voltage wire harness is effectively reduced, and the convenience of subsequent dismounting and mounting of the high-voltage wire harness is realized.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. The high-voltage distribution box circuit for the power battery is characterized by comprising a charging positive circuit, a charging negative circuit, a DC-DC power module and a cooling fan power interface, wherein the charging positive circuit and the charging negative circuit are connected with the cooling fan power interface through the DC-DC power module, the charging positive circuit outputs a positive power output interface, and the charging negative circuit outputs a negative power output interface.

2. The high-voltage distribution box circuit for the power battery according to claim 1, wherein the charge positive electrode circuit comprises an MSD fast switch, a main positive relay, a first relay, a second relay, a first fuse, a second fuse, a third fuse and a fourth fuse, an output end of the MSD fast switch is connected with a positive electrode input end of the vehicle-mounted power battery, an input end of the MSD fast switch is respectively connected with one end of the main positive relay, one end of the first relay, one end of the second relay, one end of the fourth fuse and one end of the DC-DC power module, the other end of the main positive relay is connected with the positive electrode power output interface after being connected with the first fuse in series, the other end of the first relay is connected with the first DC charge positive electrode interface after being connected with the second fuse in series, the other end of the second relay is connected with the second DC positive electrode interface after being connected with the third fuse in series, the other end of the fourth fuse is connected with the top charging anode reserved interface.

3. The high-voltage distribution box circuit for the power battery as claimed in claim 2, wherein the charging negative circuit comprises a current sensor, a main negative relay, a third relay and a fourth relay, an output end of the main negative relay is connected with a negative input end of the vehicle-mounted power battery, an input end of the main negative relay is connected with one end of a DC-DC power supply module, one end of the third relay, one end of the fourth relay, a top charging negative reserved interface and a negative power supply output interface respectively, the other end of the third relay is connected with a first direct current negative charging interface, and the other end of the fourth relay is connected with a second direct current negative charging interface.

4. The HVDC circuit for a power battery of claim 3, wherein the main positive relay is rated for 300A and the main negative relay is rated for 600A.

5. The HVDC circuit for a power battery of claim 4, wherein the first, second, third and fourth relays are rated for a current of 300A.

6. The HVDC circuit for a power battery of claim 4, wherein the first fuse has a current rating of 300A, the second fuse has a current rating of 300A, the third fuse has a current rating of 300A, and the fourth fuse has a current rating of 600A.