Battery management assembly, battery management system and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery management assembly, a battery management system and a battery pack, the battery management assembly comprises a main board and slave boards, the main board comprises a communication line, and communication between the slave boards is realized through the communication line. According to the battery management assembly, the space in the electrical cabin can be better utilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, provide a battery management assembly, battery management system and battery pack specifically. BACKGROUND

[0002] At present, with the rapid development of new energy industry, new energy equipment such as electric vehicle, electric aircraft has been widely used, and battery pack as the core part of new energy equipment has also been widely concerned.Battery management system (Battery Management System, BMS for short) as the management system of battery pack, can control the work of battery pack.

[0003] In the existing BMS design scheme, the battery management unit (Battery Management Unit, BMU for short) is a whole printed circuit board (Printed Circuit Board, PCB for short), which is generally arranged in the electrical cabin of the battery pack.The space size of the current electrical cabin is limited, and reducing the front cabin space is of great significance to improve the energy density of the battery pack and reduce the size of the battery pack.

[0004] Therefore, a new BMU design is needed to better utilize the space in the electrical cabin. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the problem of how to provide a new BMU design to better utilize the space in the electrical cabin.

[0006] In the first aspect, the utility model provides a battery management assembly, which comprises a main plate and a slave plate, the main plate comprises a communication line, and the communication between the slave plates is realized through the communication line.

[0007] Optionally, the projection of the slave plate on the corresponding plane of the main plate at least partially coincides with the slave plate.

[0008] Optionally, the main plate and the slave plate are connected through a plug-in part.

[0009] Optionally, the plug-in part is arranged along the height direction of the main plate.

[0010] Optionally, the slave plate comprises a first slave plate and a second slave plate, the projection of the first slave plate on the corresponding plane of the main plate is a first projection, the projection of the second slave plate on the corresponding plane of the main plate is a second projection, and the first projection and the second projection at least partially coincide.

[0011] Optionally, a shielding cover is arranged outside the main plate and the slave plate.

[0012] Optionally, the slave board comprises at least one of a power supply slave board, a communication slave board, an analog signal input slave board, a digital signal input slave board, a control slave board, a diagnosis slave board, a high-voltage interface slave board and a low-voltage interface slave board.

[0013] In a second aspect, the utility model also provides a battery management system, battery management system includes energy distribution unit and the battery management assembly of any one described above, energy distribution unit and battery management assembly parallelly arranged.

[0014] In a third aspect, the utility model also provides a battery pack, battery pack includes above-mentioned battery management system, battery cell and box, battery management system with battery cell sets up in the box.

[0015] Optionally, the box forms a battery cell cavity and an electrical cavity, the battery cell is arranged in the battery cell cavity, and the battery management system is arranged in the electrical cavity.

[0016] In the case of adopting the above technical solutions, the battery management assembly provided by the utility model arranges each function on the BMU on one or more slave boards, which can effectively reduce the size of the main board, and the arrangement of the main board and the slave board can be more flexible. Compared with the BMU in the prior art which is designed as a whole PCB, the BMU in the application can better utilize the space in the electrical cabin, thereby effectively increasing the front cabin size of the battery pack, thereby reducing the size of the battery pack and improving the energy density of the battery pack.

[0017] Further, each function module in the battery management assembly is modularized and integrated on a separate slave board, and when the functions and sizes are iterated, the slave board and the main board are iterated separately, which can improve the efficiency of function iteration and reduce the iteration cost.

[0018] Further, the main board and the slave board can be provided with a shielding cover. Considering the integrated scheme of the BDU and the BMU, the interference of the high-voltage system on the low-voltage system can be maximally avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0020] Figure 1 a schematic view of a battery management assembly provided by the utility model;

[0021] Figure 2 a side view of a battery management assembly provided by the utility model;

[0022] Figure 3 a side view of another battery management assembly provided by the utility model;

[0023] Figure 4 A schematic diagram of a battery management system is provided.

[0024] List of reference signs:

[0025] 10, battery management assembly; 101, main board; 102, slave board; 1021, first slave board; 1022, second slave board; 103, plug-in part; 20, projection; 201, first projection; 202, second projection; H, height direction of the main board; 11, shielding cover; 20, BDU. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0027] It should be noted that in the description of the present application, the terms "inner", "outer", "upper", "lower", "top", "bottom" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "provided", "connected", "mounted" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] As background art, the current electrical cabin has limited space size, and reducing the front cabin space is of great significance to improve the energy density of the battery pack and reduce the size of the battery pack.

[0030] To solve the above problems, in a first aspect, the present application provides an improved battery management assembly 10, please refer to Figure 1 The battery management assembly 10 can refer to BMU. The battery management assembly 10 includes a main board 101 and a slave board 102, the main board 101 includes a communication line (not shown in the figure), and the communication between different slave boards 102 is realized through the communication line.

[0031] Wherein, one or more slave boards 102 can be included, each of which is provided with electrical devices for implementing one or more functions to implement the corresponding functions. The circuit design of the traditional BMU is functionally modularized, and each level of functional module is placed on the slave board 102. The slave board 102 is electrically connected with the main board 101, and the signal transmission between each slave board 102 is realized through the communication line on the main board 101, ensuring the integrity of the functions.

[0032] In one specific embodiment, the slave board 102 includes at least one of the following: a power supply slave board, a communication slave board, an analog signal input slave board, a digital signal input slave board, a control slave board, a diagnosis slave board, a high-voltage interface slave board, and a low-voltage interface slave board.

[0033] Wherein, the power supply slave board is used to supply power to the battery management assembly 10. The communication slave board is used to realize communication between the battery pack and external devices, including servers and / or new energy vehicles, aircraft, etc. The analog signal input slave board is used to input analog signals into the battery management assembly 10. The digital signal input slave board is used to input digital signals into the battery management assembly 10. The control slave board is used to realize functional control of the battery pack. The diagnosis slave board is used to diagnose whether the functions of each module of the battery management assembly 10 can be accurately executed.

[0034] The high-voltage interface slave board is provided with a high-voltage interface for outputting the power in the battery pack to new energy vehicles, aircraft, etc. to provide power to the devices. The low-voltage interface slave board is provided with a low-voltage interface for connecting a low-voltage power supply to the battery pack.

[0035] In this embodiment, each functional module in the battery management assembly 10 is modularized and integrated on a separate slave board 102. When iterating functions and sizes, the slave board 102 and the main board 101 are iterated separately, which can improve the efficiency of functional iteration and reduce iteration costs. When iterating the power of the project and the battery pack, without changing the hardware architecture, the main board 101 can be redesigned according to the space of the electrical cabin, without the need to replace the related slave boards 102. Or when iterating the architecture, only the related slave boards 102 involved need to be replaced, without the need to replace the main board 101, which can well save the iteration cost.

[0036] Optionally, both the mainboard 101 and the slave board 102 can be PCBs. Generally, if the power requirements and size requirements of different battery packs are inconsistent, the BMU PCB needs to be redesigned. Schematic diagrams can be shared under certain circumstances, but the reuse rate of PCBs and surface mount technology (SMT) in production lines is low. Improving PCB reuse rate is an important aspect of cost reduction in BMS. The BMU design in this application can effectively improve PCB reuse rate.

[0037] pass Figure 1 The battery management component 10 distributes the various functions of the BMU onto one or more slave boards 102, effectively reducing the size of the main board 101. The arrangement of the main board 101 and slave boards 102 can be more flexible. Compared to the existing BMU design, which is a single PCB, Figure 1 The BMU can make better use of the space inside the electrical compartment, thereby effectively improving the adaptability to the size of the electrical compartment, thus reducing the size of the battery pack and increasing the energy density of the battery pack.

[0038] Secondly, the present invention also provides a battery pack, the battery pack including the aforementioned battery management component 10, battery cells and housing, wherein the battery management component 10 and battery cells are disposed within the housing.

[0039] In one specific embodiment, the housing includes a cover, a lower housing, and a bottom plate. The lower housing includes multiple side walls connected end to end. The cover and the bottom plate are respectively installed on both sides of the lower housing, thereby forming a sealed cavity inside the housing. The battery management component 10 and the battery cells are disposed in the cavity.

[0040] In another specific embodiment, the battery pack housing forms two independent cavities: a cell cavity and an electrical cavity (which may also be called an electrical compartment and a front compartment, etc.). The cells are disposed in the cell cavity, and the battery management assembly 10 is disposed in the electrical compartment. The separate placement of the battery management assembly 10 and the cells ensures their independence. In addition, the electrical compartment can have an independent opening to facilitate the maintenance and replacement of internal components.

[0041] In one specific embodiment, the top of the battery cell 20 faces the box cover, the bottom of the battery cell 20 faces the base plate, the positive electrode 201 and the negative electrode 202 of the battery cell 20 are disposed on the side facing the box cover, and the busbar component 10 is disposed between the battery cell 20 and the box cover.

[0042] In one embodiment, see Figure 2 , Figure 2 This is a side view of a battery management component 10; the projection 20 of the slave plate 102 on the corresponding plane of the main plate 101 at least partially overlaps with the main plate 101.

[0043] Wherein, the slave boards 102 can be arranged above or below the master board 101, and when there are multiple slave boards 102, the slave boards 102 can be arranged above and below the master board 101. As shown in Figure 2 The slave boards 102 are arranged above the master board 101.

[0044] It should be noted that the above or below of the master board 101 is in the height direction H. In one embodiment, when the master board 101 is placed in the electrical cabin of the battery pack, the height direction H of the master board 101 is consistent with the height direction of the electrical cabin, and the slave boards 102 can be arranged above the master board 101, that is, each slave board 102 is arranged between the master board 101 and the upper cover of the battery pack box. Alternatively, the slave boards 102 can be arranged below the master board 101, that is, each slave board 102 is arranged between the master board 101 and the bottom plate of the battery pack box.

[0045] In one embodiment, the slave boards 102 include a first slave board 1021 and a second slave board 1022, the projection of the first slave board 1021 on the plane corresponding to the master board 101 is a first projection 201, the projection of the second slave board 1022 on the plane corresponding to the master board 101 is a second projection 202, and the first projection 201 and the second projection 202 at least partially overlap.

[0046] In the above embodiment, the master board 101 and the slave boards 102 are arranged in the height direction H, and different slave boards 102 (such as the first slave board 1021 and the second slave board 1022 in Figure 2 ) are arranged in the height direction H, which can make full use of the space in the height direction H, further reduce the size in other directions, and leave more space for the battery cells in the battery pack, thereby achieving higher energy density.

[0047] In one embodiment, please refer to Figure 2 and Figure 3 The electrical connection interface between the master board 101 and the slave boards 102 is integrated into at least one plug-in connector 103, and the master board 101 and the slave boards 102 are connected through the plug-in connector 103, which facilitates the assembly between the master board 101 and the slave boards 102.

[0048] Optionally, the plug-in connector 103 is arranged in the height direction H of the master board 101.

[0049] Optionally, the plug-in connector 103 can be a gold finger or the like.

[0050] Through the plug-in connector 103 connection scheme, the space in the height direction H can be utilized, such as Figure 3The shown connector scheme stacks different function slave boards (the first slave board 1021 and the second slave board 1022), and selects different types of connectors to connect with the master board 101, improves the utilization rate of the planar size of the connector, can reduce the space size of the PCB in the direction other than the height direction H, so as to reduce the size of the electrical cabin, provide more space for the layout of the battery cell, and thus improve the energy density of the battery pack. In addition, the shape of the master board 101 and the layout mode of the slave board 102 can be flexibly designed according to the electrical cabin, so as to adapt to various shapes of the electrical cabin. The space of the electrical cabin is reduced, more space is provided for the battery pack to place the battery cell, the capacity is improved, and the size of the warehouse shell is reduced, which is beneficial to reduce the cost and has important significance in improving the user experience and reducing the cost.

[0051] In one embodiment, referring to Figure 4 , the master board 101 and the slave board 102 can be provided with a shielding cover 11. Considering the BDU integrated scheme, the interference of the high-voltage system on the low-voltage system can be avoided to the maximum extent.

[0052] In a second aspect, the utility model also provides a battery management system (BMS), the battery management system includes energy distribution unit (Battery energy Distribution Unit, is called BDU) 20 and the battery management assembly 10 (equivalent to BMU) of any one of the above, the BDU and the battery management assembly 10 are arranged in parallel.

[0053] As Figure 4 , the battery management assembly 10 and the BDU 20 are arranged in the form of left and right respectively, and the shielding cover 11 is added to the periphery of the BMU, which can reduce the electromagnetic compatibility (Electro-Magnetic Compatibility, EMC) interference of the high-voltage loop of the BDU 20 on the devices and signals of the battery management assembly 10 to the maximum extent, has more obvious EMC benefits, and can solve the problem of radiation of the high-voltage loop on the low-voltage loop under the integration of the BMU and the BDU.

[0054] In a third aspect, the utility model further provides a vehicle, and the vehicle of the utility model includes any one of the above battery packs.

[0055] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means to be within the scope of the application and form different embodiments. For example, in the claims of the application, any one of the claimed embodiments can be used in any combination.

[0056] The technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. The person skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A battery management assembly, comprising: The battery management assembly comprises a main plate and slave plates, the main plate comprises a communication line, communication between the slave plates is realized through the communication line, the main plate and the slave plates are connected through a plug-in connector, and the plug-in connector is arranged along the height direction of the main plate.

2. The battery management assembly of claim 1, wherein, The projection of the slave plates on the plane corresponding to the main plate at least partially coincides with the main plate.

3. The battery management assembly of claim 1 or 2, wherein, The slave plates comprise a first slave plate and a second slave plate, the projection of the first slave plate on the plane corresponding to the main plate is a first projection, the projection of the second slave plate on the plane corresponding to the main plate is a second projection, and the first projection and the second projection at least partially coincide.

4. The battery management assembly of claim 1 or 2, wherein, The main plate and the slave plates are externally provided with a shielding cover.

5. The battery management assembly of claim 1 or 2, wherein, The slave plates comprise at least one of a power supply slave plate, a communication slave plate, an analog signal input slave plate, a digital signal input slave plate, a control slave plate, a diagnosis slave plate, a high-voltage interface slave plate and a low-voltage interface slave plate.

6. A battery management system, characterized by, The battery management system comprises an energy distribution unit and the battery management assembly according to any one of claims 1 to 5, and the energy distribution unit and the battery management assembly are arranged in parallel.

7. A battery pack, characterized by, The battery pack comprises the battery management system according to claim 6, battery cells and a box body, and the battery management system and the battery cells are arranged in the box body.

8. The battery pack of claim 7, wherein, The box body forms a battery cell cavity and an electrical cavity, the battery cells are arranged in the battery cell cavity, and the battery management system is arranged in the electrical cavity. The box body forms a battery cell cavity and an electrical cavity, the battery cells are arranged in the battery cell cavity, and the battery management system is arranged in the electrical cavity.

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