Battery management unit

Abstract

The utility model relates to a battery management unit which comprises a battery distribution box with a shell and a BMS (Battery Management System) mainboard arranged at the side part of the shell, a pre-charging circuit and a heating circuit are integrated in the BMS main board, a pre-charging device and a heating device are arranged on the BMS main board, the pre-charging device is connected in the pre-charging circuit, the heating device is connected in the heating circuit, and the leading-out end of the pre-charging circuit and the leading-out end of the heating circuit are connected with electrical parts in the shell. According to the battery management unit provided by the utility model, the battery distribution box and the BMS mainboard are integrated together, and the pre-charging circuit, the heating circuit and the corresponding components in the traditional battery distribution box are integrated on the BMS mainboard, so that the arrangement of high-voltage wires and copper bars in the battery distribution box can be reduced, the wireless harness-free arrangement form in the battery distribution box is favorably realized, and the battery distribution box is convenient to use. And the integration degree of the battery distribution box and the BMS mainboard is improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery management unit. Background Technology

[0002] A Battery Management System (BMS) is a system that manages batteries. It typically measures battery voltage and prevents or avoids abnormal conditions such as over-discharge, over-charge, and over-temperature. A Battery Disconnect Unit (BDU), also known as a battery distribution unit, integrates high-voltage components and includes pre-charge and charge / discharge circuits. It features current and voltage detection functions to control the connection and disconnection of the power battery circuits, providing overload and short-circuit protection for the system.

[0003] In existing technologies, the battery distribution box assembly and the BMS main body are separate entities, connected by wiring harnesses and connectors to achieve communication and control functions. This approach occupies a large amount of space, wasting the overall battery pack space. Therefore, there is an urgent need to design a battery management unit with a high degree of integration and small size. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery management unit that can reduce the arrangement of high-voltage lines and copper busbars in traditional battery distribution boxes and improve the integration of the BMS motherboard and the battery distribution box.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery management unit includes a battery distribution box with a housing, and a BMS mainboard disposed on the side of the housing;

[0007] The BMS motherboard integrates a pre-charging circuit and a heating circuit, and the BMS motherboard is equipped with a pre-charging device and a heating device. The pre-charging device is connected to the pre-charging circuit, and the heating device is connected to the heating circuit. The leads of the pre-charging circuit and the leads of the heating circuit are connected to electrical components inside the housing.

[0008] Furthermore, the electrical components include a main fuse, a main positive contactor, a main negative contactor, and a shunt disposed within the housing, as well as a plurality of copper busbars; the plurality of copper busbars include a first copper busbar and a second copper busbar connected to both ends of the main positive contactor, and a third copper busbar connected to the positive end of the main negative contactor; the lead-out terminal of the pre-charging circuit is electrically connected to the first copper busbar and the second copper busbar, and the lead-out terminal of the heating circuit is electrically connected to the second copper busbar and the third copper busbar.

[0009] Furthermore, each of the first copper busbars to the third copper busbar is provided with a first electrical connection piece, and each first electrical connection piece extends out of the housing through a first through hole on the housing; the lead-out end of the pre-charging circuit and the lead-out end of the heating circuit are provided with a second electrical connection piece, and the second electrical connection piece is welded to the corresponding first electrical connection piece.

[0010] Furthermore, the BMS motherboard has a first through hole at the position corresponding to the lead-out end of the pre-charging circuit and the lead-out end of the heating circuit; each of the first electrical connectors passes through the first through hole respectively, and the protruding end of each of the first electrical connectors is aligned with the edge of the corresponding second electrical connector.

[0011] Furthermore, the plurality of copper busbars also include a fourth copper busbar connected to the negative terminal of the main negative contactor, a fifth copper busbar connected to the main fuse, and a sixth copper busbar connected to the shunt; the main fuse is connected to the main positive contactor through the first copper busbar, and the shunt is connected to the main negative contactor through the fourth copper busbar.

[0012] Furthermore, each of the fourth to sixth copper busbars is provided with a third electrical connection piece. Each third electrical connection piece extends out of the housing through a second through hole on the housing, and each third electrical connection piece is connected to the high-voltage signal acquisition terminal on the BMS motherboard.

[0013] Furthermore, both the main positive contactor and the main negative contactor have a fourth electrical connection piece at their low-voltage control terminals. Each of the fourth electrical connection pieces extends out of the housing through a third through hole and is connected to the low-voltage control lead-out terminal on the BMS main board.

[0014] Furthermore, both the main positive contactor and the main negative contactor have a fourth electrical connection piece at their low-voltage control terminals; each of the fourth electrical connection pieces extends out of the housing through a third through hole on the housing, and the fourth electrical connection piece is connected to the low-voltage control lead-out terminal on the BMS main board.

[0015] Furthermore, the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal are respectively provided with a high-voltage acquisition electrical connection piece and a low-voltage control electrical connection piece, and the BMS main board is respectively provided with a second through hole and a third through hole corresponding to the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal; each of the third electrical connection pieces passes through the second through hole and is welded to the corresponding high-voltage acquisition electrical connection piece, and each of the fourth electrical connection pieces passes through the third through hole and is welded to the corresponding low-voltage control electrical connection piece.

[0016] Furthermore, the main fuse, the main positive contactor, the main negative contactor, and the shunt are arranged sequentially along the length of the housing.

[0017] Furthermore, the pre-charge device and the heating device are welded to the same side of the BMS mainboard; and / or, the pre-charge device includes a pre-charge contactor and a pre-charge resistor connected in series in the pre-charge circuit, and the heating device includes a heating contactor and a heating fuse connected in series in the heating circuit.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] The battery management unit described in this utility model integrates a pre-charging circuit and a heating circuit by setting a BMS main board on the side of the battery distribution box housing. The BMS main board is equipped with pre-charging and heating devices, and the leads of the pre-charging circuit and the heating circuit are connected to the electrical components inside the housing. In other words, the pre-charging circuit, heating circuit, and corresponding components in the traditional battery distribution box are integrated on the BMS main board. This reduces the arrangement of high-voltage lines and copper busbars in the battery distribution box, facilitates the wireless arrangement of the battery distribution box, and also improves the integration of the battery distribution box and the BMS main board, while also providing excellent performance.

[0020] Furthermore, the electrical components within the battery distribution box include a main fuse, a main positive contactor, a main negative contactor, a shunt, and multiple copper busbars. These connect the leads of the pre-charging circuit to the first and second copper busbars at both ends of the main positive contactor, facilitating the connection between the pre-charging circuit and the positive power supply circuit inside the battery distribution box, thus forming a pre-charging loop. Similarly, the leads of the heating circuit connect to the second and third copper busbars, facilitating the connection between the heating circuit and the positive and negative power supply circuits inside the battery distribution box, thereby forming a heating loop.

[0021] Secondly, a first electrical connector is provided on each of the first to third copper busbars, and a second electrical connector is provided on the lead-out end of the pre-charging circuit and the lead-out end of the heating circuit. The first and second electrical connectors are welded together, which is beneficial to the reliability of the electrical connection between the BMS main board and the battery distribution box. This connection method replaces the wire harness connection, which is also beneficial to increase the stability of signal transmission inside the battery pack. It is also beneficial to realize the rapid assembly of the BMS main board and the battery distribution box.

[0022] Furthermore, the fourth, fifth, and sixth copper busbars allow the main fuse and the main positive contactor to be connected through the first copper busbar, forming the positive power circuit within the battery distribution box. The shunt and the main negative contactor are connected through the fourth copper busbar, forming the negative power circuit within the battery distribution box. In this way, by connecting the various electrical components with corresponding copper busbars, a wireless design can be achieved within the battery distribution box.

[0023] In addition, the high-voltage acquisition section on the battery box is connected to the high-voltage signal acquisition terminal on the BMS main board via a third electrical connector to transmit the high-voltage acquisition signal. The low-voltage control terminals of the main positive contactor and the main negative contactor are connected to the low-voltage control lead-out terminals on the BMS main board via a fourth electrical connector to transmit the low-voltage control signal.

[0024] On the BMS motherboard, high-voltage acquisition electrical connectors and second through holes are respectively set at the positions corresponding to the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal, as well as low-voltage control electrical connectors and third through holes. Each third electrical connector passes through the second through hole and is soldered to the corresponding high-voltage acquisition electrical connector, and each fourth electrical connector passes through the third through hole and is soldered to the corresponding low-voltage control electrical connector. This connection method is beneficial to improving the stability of signal transmission and also facilitates the wireless design of the battery management unit.

[0025] Furthermore, the main fuse, main positive contactor, main negative contactor, and shunt are arranged sequentially along the length of the housing, resulting in a simple structure, small footprint, and convenient arrangement of the positive and negative power supply circuits. Soldering the pre-charge and heating devices to the same side of the BMS mainboard improves the ease of arrangement of these devices on the BMS mainboard. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of the battery management unit described in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the BMS motherboard according to an embodiment of the present invention;

[0029] Figure 3 This is a structural layout diagram of the electrical components inside the battery distribution box according to an embodiment of the present utility model;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Housing; 2. BMS main board; 3. Main fuse; 4. Main positive contactor; 5. Main negative contactor; 6. Shunt;

[0032] 11. Lower housing; 12. Upper housing; 21. Pre-charge contactor; 22. Heating contact; 23. Heating fuse; 24. First through hole; 25. Second through hole; 26. Third through hole; 201. Second electrical connection piece a; 202. Second electrical connection piece b; 203. Second electrical connection piece c; 204. High voltage acquisition electrical connection piece a; 205. High voltage acquisition electrical connection piece b; 206. Low voltage control electrical connection piece a; 207. Low voltage control electrical connection piece b; 208. Low voltage control electrical connection piece c; 209. Low voltage control electrical connection piece d;

[0033] 10. First copper busbar; 20. Second copper busbar; 30. Third copper busbar; 40. Fourth copper busbar; 50. Fifth copper busbar; 60. Sixth copper busbar; 101. First electrical connector a; 301. First electrical connector b; 401. First electrical connector c; 501. Third electrical connector a; 601. Third electrical connector b; 41. Fourth electrical connector a; 42. Fourth electrical connector b; 51. Fourth electrical connector c; 52. Fourth electrical connector d;

[0034] A. First high-voltage sampling point; B. Second high-voltage sampling point; C. Third high-voltage sampling point; D. Fourth high-voltage sampling point; E. Fifth high-voltage sampling point; F. First low-voltage lead-out terminal; G. Second low-voltage lead-out terminal; M. Third low-voltage lead-out terminal; N. Fourth low-voltage lead-out terminal. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This embodiment relates to a battery management unit that can reduce the arrangement of high-voltage lines and copper busbars in traditional battery distribution boxes and improve the integration level between the BMS motherboard and the battery distribution box.

[0040] In terms of overall structure, such as Figure 1 As shown, the battery management unit of this embodiment includes a battery distribution box with a housing 1 and a BMS mainboard 2 disposed on the side of the housing 1. The BMS mainboard 2 integrates a pre-charging circuit and a heating circuit, and the BMS mainboard 2 is provided with a pre-charging device and a heating device. The pre-charging device is connected in the pre-charging circuit, and the heating device is connected in the heating circuit. The leads of the pre-charging circuit and the leads of the heating circuit are connected to electrical components inside the housing 1.

[0041] In this structure, the BMS motherboard 2 integrates a pre-charging circuit and a heating circuit. The BMS motherboard 2 is equipped with pre-charging and heating devices, and the leads of the pre-charging circuit and the heating circuit are connected to the electrical components inside the housing 1. In other words, the pre-charging circuit, heating circuit, and corresponding components in the traditional battery distribution box are integrated on the BMS motherboard 2. This reduces the arrangement of high-voltage lines and copper busbars in the battery distribution box, facilitates the wireless arrangement of the battery distribution box, and also improves the integration level between the battery distribution box and the BMS motherboard 2.

[0042] Based on the above overview, for details please refer to... Figure 1 and Figure 2 As shown, the pre-charge devices on the BMS mainboard 2 include a pre-charge contactor 21 and a pre-charge resistor connected in series in the pre-charge circuit. The heating devices on the BMS mainboard 2 include a heating contactor 22 and a heating fuse 23 connected in series in the heating circuit. The pre-charge circuit and the heating circuit are arranged inside the BMS mainboard 2 in a copper-clad manner, as is common in the prior art.

[0043] Among them, the lead-out terminal of the pre-charging circuit is Figure 2 The first high-voltage acquisition point A and the second high-voltage acquisition point B are shown in the diagram. The heating circuit is connected to the pre-charging circuit, and the heating circuit and the pre-charging circuit have the same lead-out terminal, namely the second high-voltage acquisition point B. Specifically, the lead-out terminal of the heating circuit is... Figure 1 and Figure 2 The second high-voltage acquisition point B and the third high-voltage acquisition point C are shown in the figure.

[0044] In a preferred embodiment, the pre-charge device and the heating device are welded to the same side of the BMS mainboard 2, which facilitates the convenient arrangement of the pre-charge device and the heating device on the BMS mainboard 2. Specifically, the pre-charge device and the heating device, i.e., the pre-charge contactor 21, the heating contactor 22, the heating fuse 23, etc., can be welded to the BMS mainboard 2 using a direct soldering method. Furthermore, the BMS mainboard 2 can be fixed to the side of the housing 1, for example, by screwing.

[0045] It should be noted that for other parts of the BMS motherboard 2 not mentioned above, their specific structures can be found in existing technologies.

[0046] In this embodiment, see Figure 1 and combined Figure 3 As shown, the battery distribution box housing 1 structurally includes a lower housing 11 and an upper housing 12, which are fastened together to form a cavity for accommodating electrical components. In specific implementations, the lower housing 11 and the upper housing 12 are connected by a snap-fit ​​structure, which facilitates the rapid assembly of the battery distribution box and also facilitates the installation and replacement of internal electrical components.

[0047] The electrical components within the battery distribution box specifically include a main fuse 3, a main positive contactor 4, a main negative contactor 5, and a shunt 6, all housed within the casing 1, as well as multiple copper busbars. These copper busbars include a first copper busbar 10 and a second copper busbar 20 connected to the two ends of the main positive contactor 4, and a third copper busbar 30 connected to the positive terminal of the main negative contactor 5. The lead-out terminals of the pre-charging circuit are electrically connected to the first copper busbar 10 and the second copper busbar 20, and the lead-out terminals of the heating circuit are electrically connected to the second copper busbar 20 and the third copper busbar 30. In specific implementation, the first high-voltage acquisition point A is electrically connected to the first copper busbar 10, the second high-voltage acquisition point B is electrically connected to the second copper busbar 20, and the third high-voltage acquisition point C is electrically connected to the third copper busbar 30.

[0048] At this point, the leads of the pre-charging circuit are electrically connected to the first copper busbar 10 and the second copper busbar 20 at both ends of the main positive contactor 4, which facilitates the connection of the pre-charging circuit to the positive power supply circuit inside the battery distribution box, thus forming a pre-charging circuit. The leads of the heating circuit are connected to the second copper busbar 20 and the third copper busbar 30, which facilitates the connection between the heating circuit and the positive and negative power supply circuits inside the battery distribution box, thus forming a heating circuit.

[0049] As a further preferred embodiment, in this embodiment, each of the first copper busbar 10 to the third copper busbar 30 is provided with a first electrical connection piece. Each first electrical connection piece extends out of the housing 1 through a first through hole (not shown in the figure). The lead-out ends of the pre-charging circuit and the heating circuit are each provided with a second electrical connection piece, which is welded to the corresponding first electrical connection piece. This welding connection of the first and second electrical connection pieces improves the reliability of the electrical connection between the BMS mainboard 2 and the battery distribution box. Moreover, this connection method replaces the wire harness connection, which also helps to increase the stability of signal transmission inside the battery pack. It also facilitates the rapid assembly of the BMS mainboard 2 and the battery distribution box.

[0050] In specific implementation, the first electrical connection piece set on the first copper busbar 10 to the third copper busbar 30, specifically... Figure 1 and Figure 3 The diagram shows a first electrical connection piece a101 on the first copper busbar 10, a first electrical connection piece b301 on the second copper busbar 20, and a first electrical connection piece c401 on the third copper busbar 30. The leads of the pre-charging circuit and the heating circuit are each provided with a second electrical connection piece. Specifically, this second electrical connection piece includes a second electrical connection piece a201 welded to the first high-voltage acquisition point A, a second electrical connection piece b202 welded to the second high-voltage acquisition point B, and a second electrical connection piece c203 welded to the third high-voltage acquisition point C. At this time, the first electrical connection piece a101 is welded to the second electrical connection piece a201, the first electrical connection piece b301 is welded to the second electrical connection piece b202, and the first electrical connection piece c401 is welded to the second electrical connection piece c203.

[0051] As a further preferred embodiment, in this example, a first through hole 24 is provided on the BMS mainboard 2 at the positions corresponding to the lead-out ends of the pre-charging circuit and the heating circuit. Each first electrical connector passes through the first through hole 24, and the protruding end of each first electrical connector is aligned with the edge of the corresponding second electrical connector. This ensures the reliability of the welding between the first and second electrical connectors.

[0052] In specific implementation, the protruding ends of the first connecting piece a, the first connecting piece b, and the first connecting piece c respectively pass through the corresponding first through hole 24 and are respectively aligned with the second connecting piece a, the second connecting piece b, and the second connecting piece c. Then, the first electrical connecting piece a101 is welded to the second electrical connecting piece a201, the first electrical connecting piece b301 is welded to the second electrical connecting piece b202, and the first electrical connecting piece c401 is welded to the second electrical connecting piece c203.

[0053] In addition, in this embodiment, the aforementioned multiple copper busbars also include a fourth copper busbar 40 connected to the negative terminal of the main negative contactor 5, a fifth copper busbar 50 connected to the main fuse 3, and a sixth copper busbar 60 connected to the shunt 6. The main fuse 3 and the main positive contactor 4 are connected through a first copper busbar 10, and the shunt 6 and the main negative contactor 5 are connected through the fourth copper busbar 40. By setting the fourth copper busbar 40, the fifth copper busbar 50, and the sixth copper busbar 60, the main fuse 3 and the main positive contactor 4 are connected through the first copper busbar 10 to form a positive power supply circuit in the battery distribution box, and the shunt 6 and the main negative contactor 5 are connected through the fourth copper busbar 40 to form a negative power supply circuit in the battery distribution box. In this way, by using corresponding copper busbars to connect the electrical components, a wireless design can be achieved in the battery distribution box.

[0054] In a preferred embodiment, both the fifth copper busbar 50 and the sixth copper busbar 60 are provided with third electrical connection pieces. Each third electrical connection piece extends out of the housing 1 through a second through hole (not shown in the figure) and is connected to the high-voltage signal acquisition terminal on the BMS main board 2. At this time, the high-voltage acquisition section on the battery housing is connected to the high-voltage signal acquisition terminal on the BMS main board 2 through the third electrical connection piece, enabling the transmission of high-voltage acquisition signals.

[0055] Among them, the high-voltage signal acquisition terminal on BMS motherboard 2 is also Figure 2 The fourth high-voltage acquisition point C and the fifth high-voltage acquisition point D are shown in the diagram. The third electrical connection piece, which is located on the fifth copper busbar 50 and the sixth copper busbar 60, is also... Figure 1 and Figure 3 The diagram shows the third electrical connector a501 and the third electrical connector b601. The third electrical connector a501 is electrically connected to the fourth high-voltage acquisition point C, and the third electrical connector b601 is electrically connected to the fifth high-voltage acquisition point D.

[0056] In addition, in this embodiment, a fourth electrical connection piece is also provided at the low-voltage control terminal of both the main positive contactor 4 and the main negative contactor 5. Each fourth electrical connection piece extends out of the housing 1 through a third through hole (not shown in the figure) and is connected to the low-voltage control lead-out terminal on the BMS main board 2. In this way, the low-voltage control terminals of the main positive contactor 4 and the main negative contactor 5 are connected to the low-voltage control lead-out terminal on the BMS main board 2 through the fourth electrical connection piece, thereby realizing the transmission of low-voltage control signals.

[0057] As a further preferred embodiment, in this example, the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal on the BMS motherboard 2 are respectively provided with high-voltage acquisition electrical connection pieces and low-voltage control electrical connection pieces, and the corresponding high-voltage signal acquisition terminal and low-voltage control lead-out terminal on the BMS motherboard 2 are respectively provided with second through holes 25 and third through holes 26. Each third electrical connection piece passes through the second through hole 25 and is welded to the corresponding high-voltage acquisition electrical connection piece, and each fourth electrical connection piece passes through the third through hole and is welded to the corresponding low-voltage control electrical connection piece.

[0058] By setting high-voltage acquisition electrical connectors and second through holes 25, as well as low-voltage control electrical connectors and third through holes 26 at the positions corresponding to the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal on the BMS motherboard 2, and by making each third electrical connector pass through the second through hole 25 and be soldered to the corresponding high-voltage acquisition electrical connector, and each fourth electrical connector passes through the third through hole and be soldered to the corresponding low-voltage control electrical connector, this connection method is beneficial to improving the stability of signal transmission and also to the wireless design of the battery management unit.

[0059] In practical implementation, the high-voltage acquisition electrical connection piece at the high-voltage signal acquisition end also includes... Figure 1 and Figure 2 The high-voltage acquisition electrical connectors a204 and b205 are shown in the diagram. The third electrical connectors a501 and b601 pass through the corresponding second through holes 25 and are welded to the high-voltage acquisition electrical connectors a204 and b205, respectively.

[0060] The low-voltage control electrical connector at the low-voltage control lead-out terminal also includes... Figure 1 and Figure 2 As shown, there are low-voltage control electrical connectors a206 welded to the first low-voltage lead-out terminal F, b207 welded to the second low-voltage lead-out terminal G, c208 welded to the third low-voltage lead-out terminal M, and d209 welded to the fourth low-voltage lead-out terminal N.

[0061] The fourth electrical connection piece at the low-voltage control terminal of the main positive contactor 4 and the main negative contactor 5 is also known as... Figure 1 and Figure 3 The fourth electrical connectors a41, b42, c51, and d52 shown are connected by welding through the third via to the low-voltage control electrical connectors a206, b207, c208, and d209 respectively.

[0062] It is worth noting that the first, second, third, and fourth electrical connection pieces, as well as the high-voltage acquisition electrical connection piece and the low-voltage control electrical connection piece, are all made of nickel sheets. Furthermore, depending on the actual layout requirements, they can be designed in a straight line or a Z-shaped structure to meet the usage needs.

[0063] In this embodiment, preferably, the main fuse 3, main positive contactor 4, main negative contactor 5, and shunt 6, which are disposed in the battery distribution box, are arranged sequentially along the length of the housing 1. This makes the battery distribution box simple in structure, occupies little space, and facilitates the arrangement of the positive and negative power supply circuits.

[0064] The battery management unit in this embodiment can not only reduce the arrangement of high-voltage lines and copper busbars in traditional battery distribution boxes and improve the integration of BMS motherboard 2 and battery distribution box, but also realize the advantage of complete wireless routing inside the battery distribution box, which facilitates the assembly of components inside the battery distribution box and the assembly of BMS motherboard 2. At the same time, it can also realize the fully automated assembly of the entire battery distribution box and BMS motherboard 2, thereby reducing labor costs and improving product consistency through automation.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery management unit, characterized in that: It includes a battery distribution box with a housing, and a BMS mainboard located on the side of the housing; The BMS motherboard integrates a pre-charging circuit and a heating circuit, and the BMS motherboard is equipped with a pre-charging device and a heating device. The pre-charging device is connected to the pre-charging circuit, and the heating device is connected to the heating circuit. The leads of the pre-charging circuit and the leads of the heating circuit are connected to electrical components inside the housing.

2. The battery management unit according to claim 1, characterized in that: The electrical components include a main fuse, a main positive contactor, a main negative contactor, and a shunt, all housed within the housing, as well as multiple copper busbars. The plurality of copper busbars include a first copper busbar and a second copper busbar connected to both ends of the main positive contactor, and a third copper busbar connected to the positive end of the main negative contactor; The lead-out terminal of the pre-charging circuit is electrically connected to the first copper busbar and the second copper busbar, and the lead-out terminal of the heating circuit is electrically connected to the second copper busbar and the third copper busbar.

3. The battery management unit according to claim 2, characterized in that: Each of the first copper busbars to the third copper busbar is provided with a first electrical connection piece, and each first electrical connection piece extends out of the housing through a first through hole on the housing. Both the lead-out end of the pre-charging circuit and the lead-out end of the heating circuit are provided with a second electrical connection piece, which is welded to the corresponding first electrical connection piece.

4. The battery management unit according to claim 3, characterized in that: The BMS motherboard has a first through hole at the corresponding lead-out position of the pre-charging circuit and the lead-out position of the heating circuit. Each of the first electrical connectors passes through the first through hole, and the protruding end of each of the first electrical connectors is aligned with the edge of the corresponding second electrical connector.

5. The battery management unit according to claim 2, characterized in that: The plurality of copper busbars also include a fourth copper busbar connected to the negative terminal of the main negative contactor, a fifth copper busbar connected to the main fuse, and a sixth copper busbar connected to the shunt. The main fuse is connected to the main positive contactor via the first copper busbar, and the shunt is connected to the main negative contactor via the fourth copper busbar.

6. The battery management unit according to claim 5, characterized in that: Both the fifth and sixth copper busbars are provided with a third electrical connection piece. Each third electrical connection piece extends out of the housing through a second through hole on the housing and is connected to the high-voltage signal acquisition terminal on the BMS motherboard.

7. The battery management unit according to claim 6, characterized in that: Both the main positive contactor and the main negative contactor are provided with a fourth electrical connection piece at their low-voltage control terminals. Each of the fourth electrical connectors extends out of the housing through the third through hole on the housing, and each of the fourth electrical connectors is connected to the low-voltage control lead-out terminal on the BMS main board.

8. The battery management unit according to claim 7, characterized in that: The high-voltage signal acquisition terminal and the low-voltage control lead-out terminal are respectively provided with a high-voltage acquisition electrical connection piece and a low-voltage control electrical connection piece, and the BMS main board is respectively provided with a second through hole and a third through hole corresponding to the high-voltage signal acquisition terminal and the low-voltage control lead-out terminal; Each of the third electrical connectors passes through the second through hole and is welded to the corresponding high-voltage acquisition electrical connector, and each of the fourth electrical connectors passes through the third through hole and is welded to the corresponding low-voltage control electrical connector.

9. The battery management unit according to claim 2, characterized in that: The main fuse, the main positive contactor, the main negative contactor, and the shunt are arranged sequentially along the length of the housing.

10. The battery management unit according to any one of claims 1 to 9, characterized in that: The pre-charge device and the heating device are welded to the same side of the BMS mainboard; and / or, The pre-charge device includes a pre-charge contactor and a pre-charge resistor connected in series in the pre-charge circuit, and the heating device includes a heating contactor and a heating fuse connected in series in the heating circuit.

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