CN215771395U

CN215771395U - Power battery BDU structure and vehicle

Info

Publication number: CN215771395U
Application number: CN202122070043.5U
Authority: CN
Inventors: 汪成林; 袁飞; 曾志; 吴镇汉
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-08
Anticipated expiration: 2031-08-30

Abstract

The application discloses power battery BDU structure and vehicle, power battery BDU structure includes: the device comprises a shell, wherein an accommodating cavity is formed in the shell; the battery management controller is detachably integrated in the accommodating cavity along a first direction; the high-voltage monitoring module is detachably integrated in the accommodating cavity along the first direction, the high-voltage monitoring module is used for feeding the acquired voltage signal back to the battery management controller, and the battery management controller supplies power to the high-voltage monitoring module according to the voltage signal fed back by the high-voltage monitoring module. This application is integrated battery management controller and high-pressure monitoring module in the BDU to through rationally arranging BDU internal components and parts, effectively saved battery package inner space, satisfy lightweight, miniaturized design demand. Meanwhile, the wiring harness can be arranged in the shell, so that the complicated wiring in the battery pack is avoided, the number and the length of each switching wiring harness are reduced, the cost is reduced, and the service life of the wiring harness is prolonged.

Description

Power battery BDU structure and vehicle

Technical Field

The application relates to the technical field of vehicle power batteries, in particular to a BDU structure of a power battery and a vehicle with the BUD structure of the power battery.

Background

In the prior art, a Battery Management Controller (BMC), a High Voltage monitoring module (HVSU), and the like are generally disposed outside a Battery pack disconnection Unit (BDU), which results in a large space occupied by the entire vehicle Battery system.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a new technical solution for a BDU structure of a power battery, which can at least solve the problem of large space occupation of a vehicle battery system in the prior art.

According to a first aspect of the present application, there is provided a power battery BDU structure, comprising: the device comprises a shell, a shell and a cover, wherein an accommodating cavity is formed in the shell; a battery management controller removably integrated within the receiving cavity in a first direction; the high-voltage monitoring module is detachably integrated in the accommodating cavity along a first direction, the high-voltage monitoring module is used for feeding acquired voltage signals back to the battery management controller, and the battery management controller supplies power to the high-voltage monitoring module according to the voltage signals fed back by the high-voltage monitoring module.

Optionally, the housing comprises: an upper shell; the middle shell is arranged at the bottom of the upper shell, and the middle shell is detachably connected with the upper shell; the inferior valve, the inferior valve is located the bottom of epitheca, the inferior valve with the mesochite is in the bottom of inferior valve sets up side by side, battery management controller with high pressure monitoring module locates along vertical direction detachably respectively the lateral wall of inferior valve.

Optionally, the power battery BDU structure further includes: first protective cover, second visor, third visor and fourth visor, first protective cover the second visor the third visor with the fourth visor is located the epitheca, wherein, first protective cover with the second visor is located one side of the length direction of epitheca, just first protective cover with the second visor respectively with inferior valve joint, the third visor with the fourth visor is located respectively the width direction's of casing relative both sides, the third visor with inferior valve joint, the fourth visor with well casing joint.

Optionally, the power battery BDU structure further includes: the high-voltage monitoring device comprises a first connecting piece, a first copper bar and a main negative relay, wherein the first connecting piece is connected with the high-voltage monitoring module, one end of the first copper bar is connected with the high-voltage monitoring module, the other end of the first copper bar is connected with the main negative relay, and the first connecting piece and the high-voltage monitoring module are input points of a main negative loop.

Optionally, the power battery BDU structure further includes: the second connecting piece with main positive relay is located respectively hold the intracavity, the second connecting piece with main positive relay connector is connected to as main positive return circuit input point.

Optionally, the power battery BDU structure further includes: the fuse is arranged on the second copper bar, one end of the second copper bar is connected with the main positive relay, the other end of the second copper bar is connected with the third copper bar, and the upper end of the fuse is connected with the third connecting piece to serve as an output point of a rear-drive positive loop.

Optionally, the power battery BDU structure further includes: the fourth copper bar is connected with the fourth connecting sheet to serve as an output point of the rear-drive negative circuit.

Optionally, the power battery BDU structure further includes: the third copper bar and the fifth copper bar are respectively arranged at two ends of the high-voltage connector to be used as output points of a main loop.

Optionally, the power battery BDU structure further includes: the pre-charging relay is arranged on the side wall of the lower shell and is positioned below the battery management controller; the low-voltage connector and the high-voltage connector are respectively arranged on the middle shell.

According to a second aspect of the present application, there is provided a vehicle including the power battery BDU structure described in the above embodiments.

According to an embodiment of the present disclosure, battery management controller and high-voltage monitoring module detachably set up in BDU's casing, through the rational arrangement to battery management controller, high-voltage monitoring module and the inside components and parts of BDU in BDU's casing, the rational utilization of BDU's inner space reduces the occupation space of whole car battery system, satisfies the miniaturized design demand of whole car. Meanwhile, the wiring harness can be arranged in the shell, so that the complicated wiring in the battery pack is avoided, the number and the length of each switching wiring harness are reduced, the cost is reduced, and the service life of the wiring harness is prolonged.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is an external view schematic diagram of a BDU structure of a power battery according to an embodiment of the utility model;

fig. 2 is a schematic external view of an upper shell and a protective cover in a BDU structure of a power battery according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a BDU structure of a power battery according to an embodiment of the present invention;

fig. 4 is an exploded view of the power battery BDU structure of the embodiment of the present invention;

fig. 5 is an electrical schematic diagram of a power cell BDU configuration according to an embodiment of the present invention.

Reference numerals:

a power cell BDU structure 100;

an upper case 11; a middle shell 12; a lower case 13;

a battery management controller 20;

a high voltage monitoring module 30;

a first protective cover 41; a second protective cover 42; a third protective cover 43; a fourth protective cover 44;

a first connecting piece 51; a second connecting piece 52; a third connecting piece 53; a fourth connecting piece 54;

a first copper bar 61; a second copper bar 62; a third copper bar 63; a fourth copper bar 64; a fifth copper bar 65;

a main negative relay 71; a main positive relay 72; a fuse 73; a high voltage connector 74; a low voltage connector 75; a pre-charge resistor 76; a pre-charge relay 77.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The following describes the BDU structure 100 of the power battery according to an embodiment of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, the BDU structure 100 of the power battery according to the embodiment of the present invention includes a case, a battery management controller 20, and a high voltage monitoring module 30.

Specifically, the housing is provided with an accommodating cavity. The battery management controller 20 is removably integrated within the receiving cavity in a first direction. The high voltage monitoring module 30 is detachably integrated in the accommodating cavity along a first direction, the high voltage monitoring module 30 is used for feeding acquired voltage signals back to the battery management controller 20, and the battery management controller 20 supplies power to the high voltage monitoring module 30 according to the voltage signals fed back by the high voltage monitoring module 30.

In other words, referring to fig. 1 and 4, the BDU structure 100 of the power battery according to the embodiment of the present invention is mainly composed of a case, a battery management controller 20, and a high voltage monitoring module 30. Wherein, be provided with in the casing and hold the chamber. The BDU (battery Disconnect unit) is a battery pack disconnection unit, and the structure in the BDU is disposed in the receiving cavity. The battery management controller 20 is disposed within the receiving cavity in a first direction. The first direction may be understood as a height direction of the power cell BDU structure 100.

A Battery Management Controller 20(BMC) is detachably connected to the housing, and a Battery control unit is disposed in an inner wall of the housing in a first direction (the first direction is a height direction of the BDU, as indicated by an arrow in fig. 1, or an arrow in the height direction in fig. 4) in the accommodation chamber. In the present application, by integrating the battery management controller 20 inside the case of the BDU, the space in the first direction inside the BDU (the height direction of the lower case 13, as shown by the arrow in fig. 1) is reasonably used, and the internal space of the BDU is reasonably used. The battery management controller 20 and the housing can be detachably connected in a manner of easy assembly, such as a snap connection or a bolt connection, so that the assembly difficulty of the battery management controller 20 and the housing is simplified.

A High Voltage monitoring module 30(HVSU) is disposed in the receiving chamber in a first direction, effectively utilizing a limited space in the housing in the first direction. Through integrating battery management controller 20 and high voltage monitoring module 30 inside BDU's casing, rationally utilized BDU's inner space, provided convenience to improving whole car continuation of the journey or the reasonable increase of battery package electric core.

High pressure monitoring module 30 and casing detachably are connected, and high pressure monitoring module 30 can adopt connected modes such as buckle connection or bolted connection with the casing, reduces the assembly degree of difficulty of high pressure monitoring module 30 in the BDU, improves assembly efficiency.

The high voltage monitoring module 30 is configured to feed back the acquired voltage signal to the battery management controller 20, and the battery management controller 20 supplies power to the high voltage monitoring module 30 according to the voltage signal fed back by the high voltage monitoring module 30.

In the application, the BMC and the HVSU are integrated inside the shell, and the connection wiring harnesses of the BMC, the HVSU and the BDU are integrated inside the BDU, so that various complicated wiring inside a client battery pack is avoided, the length and the number of each switching wiring harness are reduced, and the cost is reduced.

The wiring harness is arranged in the shell of the BDU, the requirement on the extreme environment resistance of the wiring harness is reduced, the protection measures of the extreme environment resistance such as similar corrugated pipe wrapping and the like do not need to be carried out on the wiring harness, and the cost is effectively reduced.

Therefore, according to the power battery BDU structure 100 provided by the embodiment of the utility model, the battery management controller 20 and the high-voltage monitoring module 30 are detachably integrated in the BDU, and through reasonable arrangement of the battery management controller 20, the high-voltage monitoring module 30 and internal components of the BDU in the shell of the BDU, the internal space of the BDU is reasonably utilized, the occupied space of a battery system of the whole vehicle is reduced, and the design requirement of miniaturization of the whole vehicle is met. Meanwhile, the wiring harness can be arranged in the shell, so that the complicated wiring in the battery pack is avoided, the number and the length of each switching wiring harness are reduced, the cost is reduced, and the service life of the wiring harness is prolonged.

According to one embodiment of the present invention, the housing includes an upper case 11, a middle case 12, and a lower case 13.

Specifically, the middle case 12 is provided at the bottom of the upper case 11, and the middle case 12 is detachably coupled to the upper case 11. The lower case 13 is disposed at the bottom of the upper case 11, the lower case 13 and the middle case 12 are disposed side by side at the bottom of the lower case 13, and the battery management controller 20 and the high voltage monitoring module 30 are detachably disposed at the side walls of the lower case 13 in the vertical direction, respectively.

That is, as shown in fig. 1 and 2, the housing is mainly composed of an upper case 11, a middle case 12, and a lower case 13. Wherein, the middle shell 12 is arranged at the bottom of the upper shell 11, and the middle shell 12 and the upper shell 11 can adopt a detachable connection mode such as clamping or screw connection and the like. The lower shell 13 is mounted at the bottom of the upper shell 11, the lower shell 13 and the middle shell 12 are arranged at the bottom of the lower shell 13 side by side, and a containing cavity for containing and installing each component in the battery management controller 20, the high-voltage monitoring module 30 and the BDU is defined by the upper shell 11, the middle shell 12 and the lower shell 13. Insert nuts can be arranged on the upper shell 11, the middle shell 12 and the lower shell 13 respectively, the limiting and assembling rationality of each structure in the BDU is guaranteed, and the fixing of internal parts of the BDU is guaranteed.

Referring to fig. 4, the battery management controller 20 and the high-voltage monitoring module 30 are detachably provided at the side walls of the lower case 13 in the vertical direction (the vertical direction is generally indicated by an arrow in the height direction in fig. 4), respectively. Specifically, the battery management controller 20(BMC) is fixed to the side wall of the lower case 13 in a vertical lateral direction, and the battery management controller 20 is bolted to the side wall of the lower case 13 through corresponding insert nuts. The vertical fixation is beneficial to the fact that the BMC occupies less internal width space of the BDU, the reasonable arrangement of the internal main loop of the BDU is convenient, and the light and small design of the BDU is favorably achieved.

The high voltage monitoring module 30(HVSU) is vertically fixed on the side wall of the lower case 13, making full use of the width and height space of the BDU at this position (the height and width directions of the BDU are approximately as shown by the arrow in fig. 4), and the corresponding screw fixing holes are provided at this position of the side wall of the lower case 13, so as to facilitate the connection of the high voltage monitoring module 30 and the lower case 13.

In the application, the battery management controller 20, the high-voltage monitoring module 30 and other related components are integrated inside the BDU, which is beneficial to implementing the design scheme for improving the reliability of the battery pack. For example, for the EMC test of the battery pack, a metal shielding plate can be added, or the shell of the BDU can be directly replaced with a metal material, so that better electromagnetic interference resistance can be realized. This power battery BDU structure 100 has simplified the battery package and has assembled the degree of difficulty, has saved battery package inner space, provides convenience to improving whole car continuation of the journey or the reasonable increase of battery package electricity core. Meanwhile, the battery management controller 20, the high-voltage monitoring module 30 and other related components are integrated in the BDU structure, so that the battery pack can be disassembled and assembled after sale, and the problem can be analyzed and solved efficiently.

In some embodiments of the present invention, the BDU structure 100 further includes a first protection cover 41, a second protection cover 42, a third protection cover 43, and a fourth protection cover 44. First protective cover 41, second protective cover 42, third protective cover 43 and fourth protective cover 44 are connected with epitheca 11 respectively, through setting up first protective cover 41, second protective cover 42, third protective cover 43 and fourth protective cover 44 at epitheca 11, increase BDU protection level, effectively avoid operating personnel directly to touch electrified body.

As shown in fig. 1 to 4, the upper case 11 is a substantially square cover, the first protection cover 41 and the second protection cover 42 are disposed on one side of the upper case 11 in the length direction, and the first protection cover 41 and the second protection cover 42 are respectively connected to the lower case 13 in a snap-fit manner. Third visor 43 and fourth visor 44 set up respectively in the relative both sides of the width direction of casing, and third visor 43 and inferior valve 13 joint, fourth visor 44 and mesochite 12 joint effectively increase BDU protection level, avoid operating personnel directly to touch electrified body, improve the security. Alternatively, the first protective cover 41, the second protective cover 42, the third protective cover 43, and the fourth protective cover 44 may be fixed on the corresponding rotating shafts of the upper shell 11 by snap connections, respectively, so as to connect the protective covers with the upper shell 11.

According to an embodiment of the present invention, as shown in fig. 4, the power battery BDU structure 100 further includes: a first connecting piece 51, a first copper bar 61 and a main negative relay 71, wherein the first connecting piece 51 is connected with the high-voltage monitoring module 30, and the first connecting piece 51 and the high-voltage monitoring module 30 are arranged in the side wall of the lower shell 13 at the corresponding insert nuts. One end of the first copper bar 61 is connected with the high-voltage monitoring module 30, and the other end of the first copper bar 61 is connected with a contact of the main negative relay 71. The first connecting tab 51 and the high voltage monitoring module 30 are the input points of the main negative circuit. The HVSU is vertically and laterally fixed at the corresponding insert nuts at four positions of the side wall of the lower shell 13, the vertical fixing mode of the HVSU at the position fully utilizes the BDU width height space at the position, and corresponding screw fixing holes are additionally formed in the side edge of the lower shell 13 and used for connecting and fixing the HVSU.

In some embodiments of the present invention, as shown in fig. 4, the power cell BDU structure 100 further includes: the second connecting sheet 52 and the main positive relay 72 are respectively installed in the accommodating cavities, and the second connecting sheet 52 is connected with the main positive relay 72 connector to serve as a main positive circuit input point.

According to an embodiment of the present invention, referring to fig. 4, the power cell BDU structure 100 further includes: a second copper bar 62, a third copper bar 63, a third connecting piece 53 and a fuse 73. The fuse 73 is fixed on the second copper bar 62, one end of the second copper bar 62 is connected with the contact of the main positive relay 72, the other end of the second copper bar 62 is connected with the third copper bar 63 and fixed at the corresponding insert nut of the lower shell 13, and the upper end of the fuse 73 is connected with the third connecting piece 53 to serve as an output point of the rear-drive positive loop.

The BDU structure 100 of the power battery further includes a fourth copper bar 64 and a fourth connecting piece 54, the fourth copper bar 64 is connected with the fourth connecting piece 54 and fixed at the corresponding insert nut of the lower case 13 to serve as an output point of the rear-drive negative circuit.

The BDU structure 100 of the power battery further includes a fifth copper bar 65 and a high-voltage connector 74, and the third copper bar 63 and the fifth copper bar 65 are respectively fixed at two ends of the high-voltage connector 74 to serve as output points of the main circuit.

The power cell BDU structure 100 also includes a pre-charge relay 77 and a low voltage connector 75. The pre-charging relay 77 can be laterally fixed on the side wall of the lower shell 13, and the pre-charging relay 77 is fixedly connected with corresponding insert nuts at four positions of the side wall of the lower shell 13. The pre-charge relay 77 is disposed below the battery management controller 20, and the low-voltage connector 75 and the high-voltage connector 74 are fixed to the side walls of the middle case 12, respectively. By fixing the high-voltage connector 74 and the low-voltage connector 75 on the same plane of the middle shell 12, the flatness of the shell is controlled, and the stable and reliable sealing performance of the battery pack is realized.

In the present application, as shown in fig. 5, the BDU structure 100 is a controller or a component for conducting and disconnecting the current storage element (generally referred to as a battery) and the electrical load. The BDU structure 100 is mainly used in a control place where a loop generates a very large current during power-on and power-off processes (e.g., an electric vehicle, an electric ship, an electric rail transit, an airplane, etc.).

The BDU structure 100 of the power battery is mainly composed of BMC, HVSU, two main relays, a pre-charge relay 77, a fuse 73, a wire-wound resistor, a housing, a wire harness, fasteners, and other parts. When the BDU structure 100 of the power battery is in a normal use process, the pre-charging relay 77 is first pulled in to charge a capacitor element in an electrical appliance, wherein in the loop, a resistor limits current within a reasonable range. After the pre-charging is finished, the main relay is closed, the pre-charging relay 77 is disconnected, the power-on process is finished, and the power supply work is continued.

When the electrical appliance is in short circuit and abnormal, the fuse 73 can be passively and forcibly fused to disconnect the electrical appliance from the power supply, so that other components in the battery pack/vehicle are protected from being damaged.

In the present application, a schematic diagram of a power battery BDU loop is shown in fig. 3, which mainly indicates a current direction when an electrical appliance is in normal operation. The cell current flows in through the second connecting sheet 52, passes through the main positive relay 72 and the second copper bar 62, flows to the positive electrode of the high-voltage connector 74 through the third copper bar 63 at one path, flows to the first load to form a main positive loop shown in the figure A-B-C2, and flows to the second load through the third connecting sheet 53 to form a rear-drive positive loop shown in the figure A-B-C1.

Referring to fig. 3, the pre-charging circuit is a circuit formed by a pre-charging resistor 76 and a pre-charging relay 77. The current passing through the first load flows into the fifth copper bar 65 from the negative electrode of the high-voltage connector 74, passes through the main negative relay 71 through the fourth copper bar 64, passes through the HVSU and the first connecting piece 51 through the first copper bar 61, and finally returns to the battery cell, so as to form a D-E2-F-G main negative loop shown in the figure. The current passing through the second load flows in from the fourth connecting sheet 54, passes through the main negative relay 71 through the fourth copper bar 64, passes through the HVSU and the first connecting sheet 51 through the first copper bar 61, and finally returns to the battery cell, thereby forming the rear-drive negative loop shown in the diagram E1-F-G.

It should be noted that the main positive loop and the main negative loop are respectively connected to the positive electrode and the negative electrode of the battery, and a front drive motor and a rear drive motor are arranged between the main positive loop and the main negative loop in parallel. On one hand, a current path is formed among the main positive loop, the precursor motor, the main negative loop and the battery, and the normal work of the precursor motor is ensured. On the other hand, a current loop is formed among the main positive loop, the rear-drive motor, the rear-drive negative loop, the main negative loop and the battery, so that the normal work of the rear-drive motor is ensured. Of course, the connection relationship and the operation principle between the front drive motor and the rear drive motor of the vehicle and each circuit are understood and can be realized by those skilled in the art, and detailed description is omitted in this application.

The communication loop is mainly used for the communication between the whole vehicle and the BMC through the low-voltage connector 75. The BMC is responsible for controlling power supply to the HVSU, the main positive relay 72, the main negative relay 71 and the pre-charging relay 77, and realizes normal on-off of a loop. And the HVSU feeds back a voltage signal to the BMC for analysis and judgment through the internal sampling wire harness.

Of course, the working principle of each component in the power battery BDU structure 100 is understood and can be realized by those skilled in the art, and will not be described in detail in this application.

In summary, according to the BDU structure 100 of the power battery in the embodiment of the utility model, the battery management controller 20 and the high-voltage monitoring module 30 are detachably integrated in the BDU, and through reasonable arrangement of the battery management controller 20, the high-voltage monitoring module 30 and internal components of the BDU in the shell of the BDU, the internal space of the BDU is reasonably utilized, the occupied space of a battery system of the whole vehicle is reduced, and the design requirement of miniaturization of the whole vehicle is met. Meanwhile, the wiring harness can be arranged in the shell, so that the complicated wiring in the battery pack is avoided, the number and the length of each switching wiring harness are reduced, the cost is reduced, and the service life of the wiring harness is prolonged.

According to a second aspect of the present application, there is provided a vehicle including the power battery BDU structure 100 in the above-described embodiment. Because the power battery BDU structure 100 provided by the embodiment of the utility model has the technical effects, the vehicle provided by the embodiment of the utility model also has the corresponding technical effects, namely, the vehicle provided by the utility model reasonably utilizes the internal space of the BDU, reduces the occupied space of a battery system of the whole vehicle and meets the design requirement of miniaturization of the whole vehicle by adopting the power battery BDU structure 100. Meanwhile, the wiring harness can be arranged in the shell, so that the complicated wiring in the battery pack is avoided, the number and the length of each switching wiring harness are reduced, the cost is reduced, and the service life of the wiring harness is prolonged.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A power battery BDU structure, characterized by, includes:

the device comprises a shell, a shell and a cover, wherein an accommodating cavity is formed in the shell;

the battery management controller is detachably arranged in the accommodating cavity along a first direction;

the high-voltage monitoring module is detachably arranged in the accommodating cavity along a first direction and is used for feeding acquired voltage signals back to the battery management controller, and the battery management controller supplies power to the high-voltage monitoring module according to the voltage signals fed back by the high-voltage monitoring module.

2. The power cell BDU structure of claim 1, wherein the housing includes:

an upper shell;

the middle shell is arranged at the bottom of the upper shell, and the middle shell is detachably connected with the upper shell;

the inferior valve, the inferior valve is located the bottom of epitheca, the inferior valve with the mesochite is in the bottom of inferior valve sets up side by side, battery management controller with high pressure monitoring module locates along vertical direction detachably respectively the lateral wall of inferior valve.

3. The BDU structure for power cells according to claim 2, further comprising: first protective cover, second visor, third visor and fourth visor, first protective cover the second visor the third visor with the fourth visor is located the epitheca, wherein, first protective cover with the second visor is located one side of the length direction of epitheca, just first protective cover with the second visor respectively with inferior valve joint, the third visor with the fourth visor is located respectively the width direction's of casing relative both sides, the third visor with inferior valve joint, the fourth visor with well casing joint.

4. The BDU structure for power cells according to claim 2, further comprising: the high-voltage monitoring device comprises a first connecting piece, a first copper bar and a main negative relay, wherein the first connecting piece is connected with the high-voltage monitoring module, one end of the first copper bar is connected with the high-voltage monitoring module, the other end of the first copper bar is connected with the main negative relay, and the first connecting piece and the high-voltage monitoring module are input points of a main negative loop.

5. The BDU structure for power cells according to claim 2, further comprising: the second connecting piece with main positive relay is located respectively hold the intracavity, the second connecting piece with main positive relay is connected to as main positive return circuit input point.

6. The BDU structure of claim 5, further comprising: the fuse is arranged on the second copper bar, one end of the second copper bar is connected with the main positive relay, the other end of the second copper bar is connected with the third copper bar, and the upper end of the fuse is connected with the third connecting piece to serve as an output point of a rear-drive positive loop.

7. The BDU structure for power cells according to claim 2, further comprising: the fourth copper bar is connected with the fourth connecting sheet to serve as an output point of the rear-drive negative circuit.

8. The BDU structure of claim 6, further comprising: the third copper bar and the fifth copper bar are respectively arranged at two ends of the high-voltage connector to be used as output points of a main loop.

9. The BDU structure for power cells according to claim 8, further comprising:

the pre-charging relay is arranged on the side wall of the lower shell and is positioned below the battery management controller;

the low-voltage connector and the high-voltage connector are respectively arranged on the middle shell.

10. A vehicle characterized by comprising the BDU structure for power battery of any one of claims 1 to 9.