Battery assembly and energy storage device

Abstract

The utility model relates to a battery assembly and energy storage equipment, the battery assembly comprises a shell, a battery module, a circuit board and a battery information sampling board, the battery module, the circuit board and the battery information sampling board are arranged in the shell, the circuit board is arranged on the first surface of the battery module and is connected with a tab of a battery cell of the battery module; the battery information sampling board is arranged on the second surface of the battery module, the circuit board is electrically connected with the battery information sampling board, and the first surface and the second surface are not coplanar. The circuit board and the battery information sampling board are arranged on different surfaces of the battery module respectively, the battery information sampling board is separated from the battery cell through the circuit board, and when thermal runaway occurs, the battery information sampling board is prevented from being damaged by electrolyte sprayed out of the tab position. The battery information sampling board is connected with the tabs of the battery module through the circuit board and can collect temperature and voltage information of the battery module so as to realize management and control of the battery assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery assembly and an energy storage device. Background Art

[0002] With the continuous development of the new energy industry, energy storage products have gradually entered thousands of households. The reliability and maintainability of energy storage products greatly affect the terminal user experience. In related technologies, the battery information sampling board in the energy storage product is arranged at the protruding end of the battery module tab, and thermal runaway is likely to occur at the tab position. The ejected electrolyte will damage the battery information sampling board, resulting in the scrapping of the battery information sampling board. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a battery assembly and an energy storage device to solve the problem that the electrolyte ejected during thermal runaway damages the battery information sampling board.

[0004] To achieve the above object, the present disclosure provides a battery assembly, including a housing and a battery module, a circuit board, and a battery information sampling board arranged in the housing. Among them,

[0005] The circuit board is arranged on the first surface of the battery module and is connected to the tabs of the battery cells of the battery module;

[0006] The battery information sampling board is arranged on the second surface of the battery module. The circuit board and the battery information sampling board are electrically connected, and the first surface and the second surface are not coplanar.

[0007] Optionally, the first surface is the top surface of the battery module, and the second surface is the side surface of the battery module.

[0008] Optionally, the circuit board is arranged on the surface where the tabs of the battery module are located.

[0009] Optionally, the battery module includes at least one battery cell group. The battery cell group includes a plurality of battery cells arranged side by side in a first direction. The battery information sampling board is arranged on one side in the second direction, and the first direction and the second direction form an angle with each other.

[0010] Optionally, there are a plurality of the battery cell groups, and adjacent two battery cell groups are connected. The plurality of battery cell groups share the battery information sampling board.

[0011] Optionally, the circuit board has a main body portion and an extension portion that forms an angle with the main body portion. The main body portion is placed on the first surface of the battery module, and the extension portion extends to the second surface of the battery module to be connected to the battery information sampling board.

[0012] Optionally, the battery cell group includes a restraint frame, and a plurality of the battery cells are placed in the inner cavity of the restraint frame.

[0013] Optionally, the battery cell group includes a support frame, the support frame is fixed on the first surface of the battery cell, the support frame has a mounting groove extending in a first direction, and the body part is fixed in the mounting groove.

[0014] Optionally, a plurality of connecting pieces are arranged at intervals on both sides of the body part, and the plurality of connecting pieces on both sides are arranged staggeredly.

[0015] Optionally, receiving grooves are arranged on both sides of the mounting groove on the support frame, and the receiving grooves are used for supporting the connecting pieces and the tabs of the battery cells.

[0016] Optionally, a detection element for obtaining the temperature and / or voltage information of the tab is arranged on the connecting piece.

[0017] Optionally, a first opening is arranged on the side wall of the housing and a cover plate for closing the first opening, and the surface of the battery information sampling board provided with functional devices faces the first opening.

[0018] Optionally, the battery information sampling board is installed in the housing through a fixing bracket.

[0019] Optionally, the fixing bracket is of a U-shaped structure, the opening of the U-shaped structure faces the first opening, and the battery information sampling board is detachably installed in the inner cavity of the U-shaped structure.

[0020] Optionally, a first connector is arranged at the end of the circuit board, a second connector is arranged on the battery information sampling board, and the first connector can be connected to the second connector.

[0021] Optionally, the length of the circuit board is configured such that the end of the circuit board can extend between the battery information sampling board and the side wall provided with the first opening.

[0022] Optionally, the circuit board has a bent section, the first connector is arranged on the bent section, and the bent section is arranged in parallel with the battery information sampling board so that the first connector and the second connector are plugged together.

[0023] Optionally, a blind plug terminal is arranged on the housing, an information transfer connector is arranged on the battery information sampling board, the information transfer connector is signal-connected to the blind plug terminal, and the blind plug terminal is used for connecting to a battery control unit.

[0024] Optionally, the housing includes a housing main body and a cover body for closing the top opening of the housing main body, and a sealing member is arranged between the housing main body and the cover body.

[0025] Optionally, the battery information sampling board is replaced with a control board in the battery management system.

[0026] According to a second aspect of the present disclosure, a energy storage device is provided, including the above-mentioned battery assembly.

[0027] Through the above technical solutions, in the battery assembly provided by the present disclosure, the circuit board and the battery information sampling board are respectively arranged on different surfaces of the battery module, and the battery information sampling board is separated from the battery cells through the circuit board. When thermal runaway occurs, the electrolyte ejected from the tab position is prevented from damaging the battery information sampling board. The battery information sampling board is connected to the tabs of the battery module through the circuit board, and can collect the temperature and voltage information of the battery module to realize the management and control of the battery assembly.

[0028] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0029] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0030] Figure 1 is an exploded view of the battery assembly provided in the related embodiments of the present disclosure, in which two battery modules and a battery information sampling board are shown to be provided inside the housing.

[0031] Figure 2 is a schematic structural view of the battery assembly provided in the related embodiments of the present disclosure, in which the assembly relationship between the battery module and the battery information sampling board is shown.

[0032] Figure 3 is a schematic structural view of the battery assembly provided in the exemplary embodiments of the present disclosure.

[0033] Figure 4 is an exploded view of the battery assembly provided in the exemplary embodiments of the present disclosure.

[0034] Figure 5 is an assembly schematic view of the battery cell group and the circuit board in the battery assembly provided in the exemplary embodiments of the present disclosure.

[0035] Figure 6 is a schematic structural view of the battery cell group in the battery assembly provided in the exemplary embodiments of the present disclosure.

[0036] Figure 7 is a schematic structural view of the circuit board in the battery assembly provided in the exemplary embodiments of the present disclosure.

[0037] Figure 8It is a side view of the battery assembly provided by an exemplary embodiment of the present disclosure.

[0038] Description of Reference Numerals

[0039] 1, 1'- housing; 100 - first opening; 101 - cover plate; 11 - lid; 2, 2'- battery module; 20 - battery cell group; 21 - battery cell; 211 - tab; 22 - support frame; 221 - mounting groove; 222 - receiving groove; 23 - restraint frame; 3 - circuit board; 31 - body part; 311 - connecting piece; 312 - detecting element; 32 - extending part; 321 - first connector; 33 - bending section; 4, 4'- battery information sampling board; 41 - second connector; 42 - information transfer connector; 5 - fixing bracket; 6 - blind plug terminal. Detailed Embodiments

[0040] The following details the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the present disclosure.

[0041] In the present disclosure, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally defined under the normal use condition of the battery assembly provided by the present disclosure. The "top" and "bottom" can refer to the directions indicated by the arrows in Figure 6 . The "inner" and "outer" refer to the inside and outside of the contour of the corresponding component. In addition, when the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another and do not have sequentiality and importance.

[0042] In the related embodiments of the present disclosure, as shown in Figure 1 and Figure 2 , a battery module 2' and a battery information sampling board 4' are provided inside the housing 1'. The battery information sampling board 4' is arranged at the tab extending end. When thermal runaway occurs, the ejected electrolyte will damage the battery information sampling board 4', resulting in the scrapping of the battery information sampling board 4'. In addition, the battery information sampling board 4' is arranged inside the housing 1' along with the battery module 2'. When performing maintenance, it is necessary to disassemble the sealing surface of the front and rear shells of the housing, and there are a large number of screws. Other shielding structures may also need to be disassembled inside, and the maintainability is poor.

[0043] To solve the problem of the battery information sampling board 4' being scrapped during thermal runaway, as shown in Figure 3 and Figure 4As shown, the present disclosure provides a battery assembly, which includes a housing 1, a battery module 2, a circuit board 3, and a battery information sampling board 4 disposed within the housing 1. Among them, the circuit board 3 is disposed on the first surface of the battery module 2 and is connected to the tabs 211 of the battery cells 21 of the battery module 2; the battery information sampling board 4 is disposed on the second surface of the battery module 2, and the circuit board 3 and the battery information sampling board 4 are electrically connected, and the first surface and the second surface are not coplanar. Here, the first surface may be the top surface of the battery module 2, and the second surface may be the side surface of the battery module 2. In other embodiments, the first surface may be the side surface of the battery module 2, and the second surface is the top surface of the battery module 2, which can be specifically adjusted according to the arrangement direction of the tabs of the battery module 2. The circuit board 3 may be disposed on the surface where the tabs 211 of the battery module 2 are located. Correspondingly, the battery information sampling board 4 is disposed on a surface different from the surface where the tabs 211 are located, which can prevent the electrolyte ejected from the position of the tabs 211 from damaging the battery information sampling board 4.

[0044] Here, it should be noted that the battery information sampling board 4 may be the sampling board in a BIC (Battery Information Collector), or the control board in a BMS (Battery Management System), and the design concept provided by the present disclosure can be adopted. Specifically, the BIC board will be taken as an example for detailed introduction in the following text. The battery module 2 may be a rectangular structure formed by stacking a plurality of battery cells 21, and the top surface is the surface where the tabs 211 are located, and the side surface of the battery module 2 may be any one of the four side surfaces.

[0045] In the battery assembly provided by the present disclosure, the circuit board 3 and the battery information sampling board 4 are respectively disposed on different surfaces of the battery module 2, and the battery information sampling board 4 is separated from the battery cells 21 through the circuit board 3. In the event of thermal runaway, it can prevent the electrolyte ejected from the position of the tabs 211 from damaging the battery information sampling board 4. The battery information sampling board 4 is connected to the tabs 211 of the battery module 2 through the circuit board 3, and can collect the temperature and voltage information of the battery module 2 to achieve the management and control of the battery assembly.

[0046] In Figure 1In the illustrated embodiment, the battery module 2' includes two cell groups, and a battery information sampling board 4' is separately provided on one side of each cell group. In the embodiment provided by the present disclosure, two cell groups 20 are provided in the housing 1. The cell group 20 includes a plurality of cells 21 arranged side by side in the first direction. Adjacent two cell groups 20 are connected by a jumper copper bar. The two cell groups 20 share one battery information sampling board 4. The battery information sampling board 4 is provided on the side where the second direction is located. The first direction and the second direction form an angle with each other. The first direction may be the length direction, the second direction may be the width direction, and the battery information sampling board 4 may be provided on the left side. The circuit board 3 of the right cell group 20 may be connected to the battery information sampling board 4 through a lead (not shown in the figure). The two cell groups 20 sharing the same battery information sampling board 4 can reduce costs and facilitate maintenance. Especially in the embodiment where the battery information sampling board 4 is provided at the first opening 100 described below, the advantage of sharing one battery information sampling board 4 can be more reflected, which will be specifically introduced in combination with the following text. Of course, the present disclosure is not limited to two cell groups 20, and the embodiments of one or more cell groups 20 all belong to the protection scope of the present disclosure.

[0047] In an exemplary embodiment of the present disclosure, the circuit board 3 may be a rectangular long strip board arranged in the length direction, and the battery information sampling board 4 may be provided on the side where the width direction is located. A part of the circuit board 3 is bent to the side of the cell group 20 to be connected to the battery information sampling board 4. Of course, the battery information sampling board 4 may also be provided on the side where the length direction is located, and it can be designed according to needs.

[0048] The present disclosure has made relevant designs on the structure of the circuit board 3, such as Figure 7 As shown, the circuit board 3 has a main body portion 31 and an extension portion 32 that forms an angle with the main body portion 31. The main body portion 31 is placed on the top surface of the battery module 2, and the extension portion 32 extends to the side of the battery module 2 to be connected to the battery information sampling board 4. The tab 211 of the cell 21 is connected to the battery information sampling board 4 through the circuit board 3, avoiding the direct connection between the battery information sampling board 4 and the tab 211, so as to realize the separate arrangement of the battery information sampling board 4 and the cell 21 through the circuit board 3. The circuit board 3 may be an integral flexible circuit board, and the main body portion 31 and the extension portion 32 are formed by bending.

[0049] Furthermore, as Figure 7As shown in the figure, a plurality of connecting pieces 311 are provided on both sides of the body portion 31 at intervals. The plurality of connecting pieces 311 on both sides can be arranged staggeredly to be respectively connected to the tabs 211 of the battery cells 21. The connecting pieces 311 can be nickel sheets and can be welded and fixed to the tabs 211. Detection elements 312 can be provided on the connecting pieces 311, such as voltage or temperature sensors, for collecting the temperature and voltage information of the battery cells 21 and transmitting it to the battery information sampling board 4. By welding the tabs 211 and the nickel sheets together for temperature and voltage information collection, the structure is simple and the cost is low.

[0050] In order to stably fix the circuit board 3 on the top surface of the battery module 2, the present disclosure has carried out relevant designs on the structure of the battery cell group 20. As Figure 5 and Figure 6 shown, the battery cell group 20 includes a plurality of battery cells 21 arranged side by side in the first direction. The battery cells 21 can be soft-pack batteries, and the tabs 211 are aluminum sheets and can be bent and shaped. After stacking a plurality of battery cells 21, the periphery is fixed by a restraint frame 23, which can bear the expansion force of the battery cells 21 and stably fix the plurality of battery cells 21 in the inner cavity of the restraint frame 23. Then, a plurality of battery cell groups 20 can be fixed inside the housing 1. The battery cell group 20 further includes a support frame 22 welded and fixed to the top surface of the battery cell 21. The support frame 22 has a mounting groove 221 extending in the length direction, and the body portion 31 of the circuit board 3 can be fixed in the mounting groove 221. A plurality of receiving grooves 222 are provided on both sides of the mounting groove 221 on the support frame 22. The tabs 211 of the battery cells 21 can pass through the support frame 22 from bottom to top, and the connecting pieces 311 and the bent tabs 211 of the battery cells 21 can be fixed in the corresponding receiving grooves 222, so as to stably fix the circuit board 3 on the top surface of the battery module 2 and realize the connection between the circuit board 3 and the tabs 211 of the plurality of battery cells 21. The mounting groove 221 is adapted to the shape of the body portion 31 of the circuit board 3, and the receiving groove 222 is adapted to the shape of the connecting piece 311, and specific adaptive designs can be carried out.

[0051] In this embodiment, as Figure 6 shown, the support frame 22 can be a frame structure formed by crossing a plurality of cross beams and longitudinal beams. The mounting groove 221 is arranged on the middle cross beam. A plurality of columns are arranged at intervals on the top surface of the cross beam, and the plurality of columns enclose the receiving groove 222 to limit and fix the connecting piece 311 and the tab 211. The mounting groove 221 is opened on the top surface of the middle cross beam, and a plurality of columns are also provided on both sides of the mounting groove 221, which can play a role in limiting and fixing the body portion 31. In other embodiments, the support frame 22 can also be a solid plate structure directly provided with the mounting groove 221 and the receiving groove 222, which can also support and fix each part of the circuit board 3. The frame-type support frame 22 can reduce the overall weight of the battery assembly and achieve a lightweight design.

[0052] To achieve the electrical connection between the circuit board 3 and the battery information sampling board 4, as Figure 7 shown, a first connector 321 is provided on the extension portion 32 of the circuit board 3, and a second connector 41 is provided on the battery information sampling board 4. The first connector 321 can be connected to the second connector 41 to transmit the voltage and temperature information of the battery module 2 to the battery information sampling board 4 through the circuit board 3, and the relevant operating parameters of the battery cells can be obtained in real time.

[0053] In the present disclosure, in order to facilitate the maintenance and repair of the battery information sampling board 4, as Figure 4 shown, a first opening 100 and a cover plate 101 for closing the first opening 100 are provided on the side wall of the housing 1. The surface of the battery information sampling board 4 provided with functional devices is arranged in the housing 1 facing the first opening 100. The functional devices here include the second connector 41 on the battery information sampling board 4 and the information transmission connector 42 to be introduced below. Of course, it can also be other functional devices, all of which are arranged facing the first opening 100. Just open the cover plate 101 to repair the battery information sampling board 4, and the size of the first opening 100 is configured such that the battery information sampling board 4 can be directly taken out from the side, and the repair is extremely simple and convenient.

[0054] The housing 1 can be of a rectangular structure. Two battery cell groups 20 can be arranged along the length direction in the inner cavity of the housing 1. The battery information sampling board 4 is installed in the housing 1 through a fixing bracket 5. The fixing bracket 5 can be welded and fixed to the inner wall of the housing 1. In an exemplary embodiment of the present disclosure, the fixing bracket 5 can be of a U-shaped structure, and the opening of the U-shaped structure faces the first opening 100. The battery information sampling board 4 is installed in the inner cavity of the U-shaped structure. It can not only stably fix the battery information sampling board 4 in the housing 1, but also wrap the battery information sampling board 4 to play an isolation role, better protect the battery information sampling board 4, and at the same time will not affect the disassembly of the battery information sampling board 4 from the side. A sealing ring can be provided between the cover plate 101 and the first opening 100, and after being pressed tightly with screws, it is waterproof and dustproof, and can ensure the sealing performance of the entire battery assembly. The battery information sampling board 4 can be detachably installed on the fixing bracket 5 by fasteners. When disassembly is required, the battery information sampling board 4 can be taken out from the first opening 100 for repair.

[0055] As Figure 3 shown, in the present disclosure, the length of the circuit board 3 can be configured such that: the extension portion 32 of the circuit board 3 can extend between the battery information sampling board 4 and the side wall provided with the first opening 100. As Figure 7As shown, the circuit board 3 has a bent section 33, and the first connector 321 is arranged on the bent section 33. The bent section 33 is bent to be parallel to the battery information sampling board 4 so that the first connector 321 and the second connector 41 are plugged into each other. By designing the lengths of the extension part 32 and the bent section 33, it is more convenient to connect the first connector 321 and the second connector 41. Specifically, it can be designed according to the distance between the fixed bracket 5 and the adjacent battery cell group 20. The end of the circuit board 3 can extend into the inner cavity of the fixed bracket 5 from one end of the fixed bracket 5, and the bent section 33 is bent to be parallel to the battery information sampling board 4, thereby realizing the plugging of the two connectors.

[0056] As Figure 3 shown, the housing 1 is provided with blind plug terminals 6, and the battery information sampling board 4 is provided with information transfer connectors 42. The information transfer connectors 42 are signal-connected to the blind plug terminals 6, and the blind plug terminals 6 are used to connect to the battery control unit. The information collected by the battery information sampling board 4 is transmitted to the blind plug terminals 6 through the information transfer connectors 42 and then transmitted to the battery control unit BCU. The blind plug terminals 6 can be arranged on two side walls of the housing 1 that are oppositely arranged along the width direction, and can obtain the voltage and temperature information of this battery module and adjacent battery modules and transmit them to the BCU for battery system management.

[0057] The housing 1 includes a housing main body and a cover body 11 for closing the top opening of the housing main body. A seal is provided between the housing main body and the cover body 11. By opening the cover body 11, multiple battery cell groups 20 in the housing main body can be installed and maintained. Similarly, the seal can be an O-ring, which can ensure the sealing performance of the entire battery module, preventing water and dust.

[0058] In the battery module provided by the present disclosure, the tab 211 of the battery cell 21 can be bent and welded and fixed together with the connecting piece 311 protruding from the circuit board 3. The connecting piece 311 is provided with temperature and voltage sensors, which can collect the temperature and voltage information at the tab 211 of the battery cell 21, and transmit the collected information to the battery information sampling board 4 through the circuit board 3. Then, the battery information sampling board 4 communicates with the blind plug terminals 6 to transmit the information to the BCU for managing and controlling the battery module according to the obtained information. Since the battery information sampling board 4 is separated from the battery cell 21, the electrolyte ejected at the position of the tab 211 during thermal runaway will not damage the battery information sampling board 4. The battery information sampling board 4 is isolated by the fixed bracket 5, which can better protect the battery information sampling board 4. In addition, since the first opening 100 is provided on the side surface of the housing 1, the battery information sampling board 4 can be directly taken out from the side, which is convenient for maintenance. Multiple battery cell groups 20 share the same battery information sampling board 4, which is convenient for layout and saves space.

[0059] According to a second aspect of the present disclosure, there is provided an energy storage device including the battery assembly introduced above. This energy storage device has all the beneficial effects of the above-mentioned battery assembly, and will not be elaborated here.

[0060] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0061] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0062] Furthermore, any combination can be made among various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery assembly, characterized in that, It includes a housing and a battery module, a circuit board and a battery information sampling board disposed within the housing. Among them, the circuit board is disposed on a first surface of the battery module and is connected to the tabs of the battery cells of the battery module; the battery information sampling board is disposed on a second surface of the battery module, the circuit board and the battery information sampling board are electrically connected, and the first surface and the second surface are not coplanar.

2. The battery assembly according to claim 1, wherein The first surface is the top surface of the battery module, and the second surface is the side surface of the battery module.

3. The battery assembly according to claim 1, wherein, The circuit board is disposed on the surface of the battery module where the tabs are located.

4. The battery assembly according to claim 1, wherein The battery module includes at least one battery cell group, the battery cell group includes a plurality of battery cells arranged side by side in a first direction, the battery information sampling board is disposed on one side in the second direction, and the first direction and the second direction form an angle with each other.

5. The battery assembly according to claim 4, wherein There are a plurality of the battery cell groups, and adjacent two of the battery cell groups are connected, and the plurality of battery cell groups share the battery information sampling board.

6. The battery assembly according to claim 4, characterized in that The circuit board has a body portion and an extension portion that forms an angle with the body portion. The body portion is placed on the first surface of the battery module, and the extension portion extends to the second surface of the battery module and is connected to the battery information sampling board.

7. The battery assembly according to claim 6, wherein, The battery cell group includes a restraint frame, and a plurality of the battery cells are placed in the inner cavity of the restraint frame.

8. The battery assembly according to claim 6, wherein, The battery cell group includes a support frame, the support frame is fixed on the first surface of the battery cell, the support frame has a mounting groove extending in the first direction, and the body portion is fixed in the mounting groove.

9. The battery assembly according to claim 8, wherein A plurality of spaced connection pieces are provided on both sides of the body portion, and the plurality of connection pieces on both sides are arranged staggeredly.

10. The battery assembly according to claim 9, wherein Receiving grooves are provided on both sides of the mounting groove on the support frame, and the receiving grooves are used to support the connection pieces and the tabs of the battery cells.

11. The battery assembly according to claim 9, wherein, Detection elements for obtaining the temperature and / or voltage information of the tabs are provided on the connection pieces.

12. The battery assembly according to any one of claims 1-11, characterized in that, A first opening and a cover plate for closing the first opening are provided on the side wall of the housing, and the surface of the battery information sampling board provided with functional devices faces the first opening.

13. The battery assembly according to claim 12, characterized in that, The battery information sampling board is installed in the housing through a fixing bracket.

14. The battery assembly according to claim 13, wherein The fixing bracket is of a U-shaped structure, the opening of the U-shaped structure faces the first opening, and the battery information sampling board is detachably installed in the inner cavity of the U-shaped structure.

15. The battery assembly according to claim 12, wherein, A first connector is provided at the end of the circuit board, a second connector is provided on the battery information sampling board, and the first connector can be connected to the second connector.

16. The battery assembly according to claim 15, characterized in that, The length of the circuit board is configured such that the end of the circuit board can extend between the battery information sampling board and the side wall provided with the first opening.

17. The battery assembly according to claim 16, wherein The circuit board has a bent section, the first connector is provided on the bent section, and the bent section is arranged parallel to the battery information sampling board so that the first connector and the second connector are plugged together.

18. The battery assembly according to claim 1, characterized in that, Blind plug terminals are provided on the housing, information transfer connectors are provided on the battery information sampling board, the information transfer connectors are signal-connected to the blind plug terminals, and the blind plug terminals are used to be connected to a battery control unit.

19. The battery assembly according to claim 1, wherein, The housing includes a housing main body and a cover for closing the top opening of the housing main body, and a seal is provided between the housing main body and the cover.

20. The battery assembly according to claim 1, characterized in that, The battery information sampling board is replaced with a control board in the battery management system.

21. An energy storage device, characterized in that, It includes the battery assembly according to any one of claims 1-20.

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