Battery pack and energy storage device

Abstract

The utility model provides a battery pack and energy storage equipment. The battery pack comprises a battery cell, a bracket, an acquisition plate and a connecting piece, the battery cell is fixed on the bracket; the support is configured to contract towards the center of the structure along with reduction of the temperature of the environment where the support is located. The acquisition board is configured to acquire operation data of the battery cell. The connecting piece comprises a first connecting part, a second connecting part and an elastic switching part. The first connecting part is electrically connected with the acquisition board and is fixed relative to the acquisition board. The second connecting part is electrically connected with the battery cell and is fixed relative to the battery cell; the first connecting part of the same connecting piece is closer to the structural center of the support than the second connecting part. The first connecting part and the second connecting part are connected to the two ends of the elastic switching part respectively. The elastic adapter part is configured to be capable of elastically deforming so as to allow the second connecting part to move close to the first connecting part. According to the battery pack and the energy storage equipment provided by the invention, the connection stability of the connecting sheet, the battery cell and the acquisition board at different environment temperatures can be improved.

Description

Technical Field

[0001] This application relates to the field of mobile energy storage technology, and more particularly to a battery pack and energy storage device. Background Technology

[0002] In energy storage devices, a data acquisition board is typically used to collect operational data from the battery cells, but the cells are usually fixed in place by brackets. When the ambient temperature changes significantly, especially when the temperature drops considerably, the connecting pieces may break, thus affecting the normal operation of the data acquisition board. Utility Model Content

[0003] In view of this, this application provides a battery pack and energy storage device that can improve the connection stability of the connecting piece, battery cell and acquisition board under different ambient temperatures.

[0004] One embodiment of this application provides a battery pack. The battery pack includes battery cells, a support frame, a data acquisition board, and connecting tabs. The battery cells are fixed to the support frame. The support frame is configured to contract towards its structural center as the ambient temperature decreases. The data acquisition board is configured to collect operating data from the battery cells. The connecting tabs include a first connecting portion, a second connecting portion, and a resilient adapter portion. The first connecting portion is electrically connected to and fixed relative to the data acquisition board. The second connecting portion is electrically connected to and fixed relative to the battery cells. The first connecting portion of the same connecting tab is closer to the structural center of the support frame than the second connecting portion. The first connecting portion and the second connecting portion are respectively connected to the two ends of the resilient adapter portion. The resilient adapter portion is configured to elastically deform to allow the second connecting portion to move closer to the first connecting portion.

[0005] As the support gradually contracts towards its structural center as the temperature decreases, it moves the battery cell along with it, causing the second connection part to move as well. The first connection part is closer to the structural center of the support than the second connection part. Through the elastic deformation generated by the elastic transition part, the second connection part can move closer to the first connection part as it moves with the support, which helps to prevent the connection piece from being pulled off and thus allows the connection piece to be stably connected between the battery cell and the acquisition board.

[0006] In some embodiments of this application, the support is configured to expand away from its structural center as the ambient temperature increases. The resilient transition portion is configured to elastically deform to allow the second connection portion to move away from the first connection portion.

[0007] As the support expands away from its structural center due to rising temperature, it causes the battery cell to move along with it, and consequently, the second connection also moves. Through the elastic deformation generated by the elastic transition part, the second connection can move away from the first connection as the support moves, adapting to the deformation of the support, thereby ensuring that the connecting piece can be stably connected between the battery cell and the acquisition board.

[0008] In some embodiments of this application, multiple battery cells are provided. Multiple connecting pieces are provided. Different connecting pieces are configured to connect between the acquisition board and different battery cells. Multiple connecting pieces are arranged sequentially at intervals along a straight line, and this straight line is defined to be parallel to a first direction. A plane perpendicular to the first direction and passing through the structural center of the bracket is defined as a defined interface. In each connecting piece located on both sides of the defined interface, the first connecting portion is relatively close to the defined interface relative to the corresponding second connecting portion in the first direction.

[0009] As the temperature decreases, the bracket contracts towards the set interface on both sides in the first direction, and the arrangement direction of the multiple connecting pieces is roughly the same as the contraction trend of the bracket. Therefore, in the connecting pieces on both sides of the set interface, the first and second connecting parts of the same connecting piece are positioned opposite each other in the first direction. The first connecting part is closer to the set interface in the first direction than the second connecting part, so that the distance between the first and second connecting parts in the first direction is shortened as the bracket contracts. This helps to prevent the connecting pieces from breaking, thus ensuring a stable connection between the battery cell and the acquisition board.

[0010] In some embodiments of this application, the acquisition plate is located on one side of the support. The distribution direction of the acquisition plate and the support is defined to be parallel to a second direction. A first direction is perpendicular to the second direction. A third direction is defined to be perpendicular to both the first and second directions. The length of the support extending in the first direction is greater than the length of the support extending upwards in the third direction.

[0011] The connecting piece connects the acquisition board and the battery cell fixed by the bracket. Therefore, the connecting piece and the acquisition board are located on the same side of the bracket in the second direction. Deformation of the bracket in the second direction will cause the connecting piece and the acquisition board to move in the same direction, thus having little impact on the distance between the first and second connecting parts of the same connecting piece in the second direction. In the direction perpendicular to the second direction, the deformation of the bracket has a greater impact on the shape of the connecting piece. Specifically, the extension length of the bracket in the first direction is greater than its extension length in the third direction. With temperature changes, the deformation of the bracket in the first direction is relatively larger than that in the third direction. In the same connecting piece, at least in the first direction, the first connecting part is closer to the structural center of the bracket than the second connecting part. Therefore, the elastic deformation of the elastic transition part helps the connecting piece to deform and adapt to the applied deformation, so that the connecting piece can be stably connected between the battery cell and the acquisition board.

[0012] In some embodiments of this application, the elastic transition portion is an arched structure and is configured to arch and deform toward the bracket or acquisition plate to allow relative movement between the first connection portion and the second connection portion.

[0013] As the support contracts with decreasing temperature, the arched structure of the elastic transition section can induce the elastic transition section itself to deform by increasing the arch amplitude, thereby satisfying the need for the first connection section and the second connection section to move closer to each other.

[0014] In some embodiments of this application, the elastic transition portion has a first transition segment, a second transition segment, and a third transition segment. The first transition segment is connected to a first connecting portion. The second transition segment is connected to a second connecting portion. The first and second transition segments are respectively bent and connected to the third transition segment. The elastic transition portion is configured to be flexible and deformable between the first and third transition segments and between the second and third transition segments, so as to allow relative movement between the first and second connecting portions.

[0015] As the support contracts with decreasing temperature, the bending fit structure between the first and third transition sections, as well as the bending fit structure between the second and third transition sections, can induce the two bending fit structures to further bend and fold the elastic transition part by increasing the bending amplitude, so as to meet the need for the first and second connecting parts to move closer to each other.

[0016] In some embodiments of this application, at least one side of the elastic transition portion is provided with a notch along the extension path from the first connecting portion to the second connecting portion. Furthermore, the cross-sectional area of ​​the elastic transition portion at the notch is smaller than the cross-sectional area at any location of the first connecting portion and the second connecting portion.

[0017] By setting a notch, the structure of the elastic transition part is relatively weak at the notch, making it easier to deform under force. This increases the possibility of inducing elastic deformation in the elastic transition part when the temperature changes, so that the first and second connecting parts of the same connecting piece can move relative to each other to adapt to the deformation of the bracket.

[0018] In some embodiments of this application, the acquisition plate is located on one side of the support. A connecting piece is disposed between the support and the acquisition plate. The acquisition plate has a first connecting hole and a second connecting hole. The first connecting part is fixedly connected to the acquisition plate through the first connecting hole. The second connecting part is exposed on the side of the acquisition plate opposite to the support through the second connecting hole.

[0019] By providing a first connection hole, the structure connecting the acquisition board and the connecting piece can pass directly through the first connection hole, facilitating direct connection of the acquisition board and the connecting piece from the side of the acquisition board away from the support. Furthermore, by providing a second connection hole, the second connection part can be exposed from the side of the acquisition board away from the support. The structure connecting the battery cell and the connecting piece can pass through the second connection hole, and the second connection part can be directly observed, facilitating connection of the battery cell and the connecting piece from the side of the acquisition board away from the support.

[0020] In some embodiments of this application, the diameter of the second connecting hole is larger than the diameter of the first connecting hole.

[0021] The first connecting hole has a smaller diameter than the second connecting hole to reduce the opening area on the acquisition board, making it easier to lay out the circuit on the acquisition board. The second connecting hole has a larger diameter than the first connecting hole to increase the visible area for observing the second connection part of the connecting piece, making it easier to connect the battery cell and the connecting piece.

[0022] One embodiment of this application provides an energy storage device. The energy storage device includes a housing and a battery pack as described in any of the above embodiments. The battery pack is disposed within the housing.

[0023] When the temperature of the energy storage device decreases, the second connection part moves with the bracket and can get closer to the first connection part, which helps to avoid the connection piece being pulled off, so that the connection piece of the energy storage device can be stably connected between the battery cell and the acquisition board. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0025] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application;

[0026] Figure 2 for Figure 1 Explosion diagram of a medium-sized energy storage device;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of the battery pack;

[0028] Figure 4 for Figure 3 A structural schematic diagram of the battery pack from another perspective;

[0029] Figure 5 for Figure 3 Schematic diagram of the middle connecting piece;

[0030] Figure 6 for Figure 3 A cross-sectional schematic diagram of the battery pack section;

[0031] Figure 7 for Figure 3 A cross-sectional schematic diagram of another form of the battery pack structure.

[0032] Explanation of main component symbols

[0033] 100 - Battery pack; 200 - Energy storage device;

[0034] 10-Battery cell; 20-Bracket; 30-Collection board; 31-First connection hole; 32-Second connection hole; 40-Connecting piece; 41-First connecting part; 42-Second connecting part; 43-Flexible adapter part;

[0035] 431 - Notch; 432 - First transition section; 433 - Second transition section; 434 - Third transition section; 201 - Housing; 202 - Power conversion module;

[0036] X - First direction; Z - Second direction; Y - Third direction; P - Structure center; S - Setting interface. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] The term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0040] Furthermore, the terms “first,” “second,” “third,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0041] In energy storage devices, a data acquisition board is typically used to collect operational data from the battery cells, but the cells are usually fixed in place by brackets. When the ambient temperature changes significantly, especially when the temperature drops considerably, the connecting pieces may break, thus affecting the normal operation of the data acquisition board.

[0042] Embodiments of this application provide a battery pack. The battery pack includes battery cells, a support frame, a data acquisition board, and connecting tabs. The battery cells are fixed to the support frame. The support frame is configured to contract towards its structural center as the ambient temperature decreases. The data acquisition board is configured to collect operating data from the battery cells. The connecting tab includes a first connecting portion, a second connecting portion, and a resilient adapter portion. The first connecting portion is electrically connected to and fixed relative to the data acquisition board. The second connecting portion is electrically connected to and fixed relative to the battery cells. The first connecting portion of the same connecting tab is closer to the structural center of the support frame than the second connecting portion. The first connecting portion and the second connecting portion are respectively connected to the two ends of the resilient adapter portion. The resilient adapter portion is configured to elastically deform to allow the second connecting portion to move closer to the first connecting portion.

[0043] As the support gradually contracts towards its structural center as the temperature decreases, it moves the battery cell along with it, causing the second connection part to move as well. The first connection part is closer to the structural center of the support than the second connection part. Through the elastic deformation generated by the elastic transition part, the second connection part can move closer to the first connection part as it moves with the support, which helps to prevent the connection piece from being pulled off and thus allows the connection piece to be stably connected between the battery cell and the acquisition board.

[0044] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0045] See Figures 1 to 3 One embodiment of this application provides a battery pack 100 and an energy storage device 200. The battery pack 100 is applied to the energy storage device 200 and can serve as an energy storage component of the energy storage device 200.

[0046] In some embodiments, the energy storage device 200 has the functions of storing and discharging electricity for use as backup power for homes, production units, outdoor work, outdoor recreation, etc.

[0047] In some embodiments, the energy storage device 200 includes at least one battery pack 100, and the number of battery packs 100 can be adaptively adjusted according to different set capacities.

[0048] In some embodiments, the energy storage device 200 includes a housing 201. A battery pack 100 is disposed within the housing 201, and the housing 201 protects the battery pack 100.

[0049] In some embodiments, the energy storage device 200 includes a power conversion module 202. The power conversion module 202 is electrically connected to the battery cells 10 of the battery pack 100, and is used to control the AC / DC conversion of the output current of the battery cells 10. The energy storage device 200 equipped with the power conversion module 202 can be a small portable power bank, a residential energy storage power bank, an industrial or commercial energy storage power bank, or a containerized energy storage power bank, etc.

[0050] In some embodiments, the power conversion module 202 may be omitted. An energy storage device 200 without a power conversion module 202 can be used independently. An energy storage device 200 without a power conversion module 202 typically only outputs DC power. When used independently, an energy storage device 200 without a power conversion module 202 can be used in conjunction with an energy storage device 200 with a power conversion module 202 as a power system providing additional battery capacity.

[0051] In some embodiments, the battery pack 100 includes battery cells 10 and a bracket 20. The battery cells 10 are fixed to the bracket 20. The number of battery cells 10 can be one or more. And the bracket 20 can fix multiple battery cells 10 at the same time.

[0052] Understandably, in some embodiments, the support 20 is made of plastic, which is easy to manufacture and has a low cost. However, the plastic material makes the shape and size of the support 20 susceptible to temperature changes.

[0053] See Figure 3 In some embodiments, the battery pack 100 further includes a data acquisition board 30 and a connecting piece 40. The data acquisition board 30 is configured to acquire operating data of the battery cell 10. The data acquisition board 30 is disposed on the bracket 20. The connecting piece 40 connects the battery cell 10 and the data acquisition board 30 to achieve an electrical connection between the battery cell 10 and the data acquisition board 30. As an exemplary example, the data acquisition board 30 can acquire the voltage of the battery cell 10 through the connecting piece 40.

[0054] Understandably, in some embodiments, the material of the acquisition board 30 makes the shape and size of the acquisition board 30 less susceptible to temperature changes, thereby ensuring the stability of the circuit structure on the acquisition board 30.

[0055] See Figure 4 and Figure 5 In some embodiments, the support 20 is configured to contract towards its structural center P as the ambient temperature decreases. The connecting piece 40 includes a first connecting portion 41, a second connecting portion 42, and a resilient transition portion 43. The first connecting portion 41 is electrically connected to and fixed relative to the acquisition plate 30. The second connecting portion 42 is electrically connected to and fixed relative to the battery cell 10. The first connecting portion 41 of the same connecting piece 40 is closer to the structural center P of the support 20 than the second connecting portion 42. The first connecting portion 41 and the second connecting portion 42 of the same connecting piece 40 are respectively connected to the two ends of the resilient transition portion 43. The resilient transition portion 43 is configured to elastically deform to allow the second connecting portion 42 of the same connecting piece 40 to move closer to the first connecting portion 41.

[0056] As the temperature decreases, the bracket 20 gradually contracts towards its structural center P, causing the battery cell 10 to move along with it, and consequently, the second connecting part 42 also moves along with it. The first connecting part 41 is closer to the structural center P of the bracket 20 than the second connecting part 42. Through the elastic deformation generated by the elastic transition part 43, the second connecting part 42 can move closer to the first connecting part 41 as the bracket 20 moves, which helps to prevent the connecting piece 40 from breaking, thus ensuring that the connecting piece 40 is stably connected between the battery cell 10 and the acquisition board 30.

[0057] Understandably, in some embodiments, the energy storage device 200 needs to undergo a low-temperature test to test the stability of its operation. During the low-temperature test, the support 20 contracts towards its structural center P as the ambient temperature decreases. Understandably, in some embodiments, when the energy storage device 200 is at room temperature and the ambient temperature subsequently decreases, the second connecting portion 42 of the same connecting piece 40 moves closer to the first connecting portion 41.

[0058] See Figure 1 In some embodiments, the support 20 is configured to expand away from its structural center P as the ambient temperature increases. The resilient transition portion 43 is configured to elastically deform to allow the second connection portion 42 of the same connecting piece 40 to move away from the first connection portion 41.

[0059] As the temperature rises, the bracket 20 gradually expands away from its structural center P, causing the battery cell 10 to move along with it, and thus the second connecting part 42 also moves along with it. Through the elastic deformation generated by the elastic transition part 43, the second connecting part 42 can move away from the first connecting part 41 as it moves with the bracket 20, so as to adapt to the deformation of the bracket 20, thereby enabling the connecting piece 40 to be stably connected between the battery cell 10 and the acquisition board 30.

[0060] Understandably, in some embodiments, when the energy storage device 200 is at room temperature and the ambient temperature first decreases and then increases, the second connecting portion 42 of the same connecting piece 40 moves away from the first connecting portion 41 during the increase in ambient temperature. In other embodiments, when the energy storage device 200 is at room temperature and the ambient temperature then increases, the second connecting portion 42 of the same connecting piece 40 moves away from the first connecting portion 41.

[0061] See Figure 3 and Figure 4 In some embodiments, multiple battery cells 10 are provided. Multiple connecting pieces 40 are provided. Different connecting pieces 40 are configured to connect between the acquisition board 30 and different battery cells 10, so as to enable the acquisition board 30 to acquire the operating data of different battery cells 10.

[0062] In some embodiments, a plurality of connecting pieces 40 are sequentially spaced along a straight line, and this straight line is defined to be parallel to a first direction. The acquisition plate 30 is located on one side of the bracket 20, and the distribution direction of the acquisition plate 30 and the bracket 20 is defined to be parallel to a second direction. A third direction is defined to be perpendicular to both the first and second directions, and the first, second, and third directions are mutually perpendicular. The first direction is... Figure 3 , Figure 4 , Figure 6 and Figure 7 The direction parallel to X is shown in the diagram, and the second direction is... Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the direction parallel to Z is the third direction. Figure 3 , Figure 4 , Figure 6 and Figure 7 The direction shown is parallel to the direction indicated by Y. For ease of reference, the first direction will be referred to as "first direction X" in the following text, the second direction as "second direction Z", and the third direction Y as "third direction Y".

[0063] See Figures 3 to 5 In some embodiments, a plane perpendicular to the first direction X and passing through the structural center P of the support 20 is defined as the set interface S. In each connecting piece 40 located on both sides of the set interface S, the first connecting portion 41 is close to the set interface S in the first direction X relative to the corresponding second connecting portion 42.

[0064] As the temperature decreases, the bracket 20 contracts towards the set interface S on both sides in the first direction X. The arrangement direction of the multiple connecting pieces 40 is roughly the same as the contraction trend of the bracket 20. Therefore, among the connecting pieces 40 on both sides of the set interface S, the first connecting part 41 and the second connecting part 42 of the same connecting piece 40 are arranged in opposite positions in the first direction X. The first connecting part 41 of the connecting pieces 40 on both sides is closer to the set interface S in the first direction X than the second connecting part 42. This shortens the distance between the first connecting part 41 and the second connecting part 42 in the first direction X as the bracket 20 contracts, which helps to prevent the connecting piece 40 from being pulled off. This allows the connecting piece 40 to be stably connected between the battery cell 10 and the acquisition board 30.

[0065] As the temperature rises, the bracket 20 expands from the set interface S in the first direction X to both sides. The arrangement direction of the multiple connecting pieces 40 is roughly the same as the expansion trend of the bracket 20. Moreover, among the connecting pieces 40 on both sides of the set interface S, the first connecting part 41 and the second connecting part 42 of the same connecting piece 40 are arranged in opposite positions in the first direction X. Thus, the distance between the first connecting part 41 and the second connecting part 42 of each connecting piece 40 on both sides of the set interface S can be increased, and the connecting pieces 40 on both sides have an elongation and deformation trend, so that each connecting piece 40 can be stably connected between the battery cell 10 and the acquisition board 30.

[0066] It is understood that in some embodiments, the distribution direction of the first connecting part 41 and the second connecting part 42 is not strictly limited to being parallel to the first direction X. Instead, the angle between the distribution direction of the first connecting part 41 and the second connecting part 42 and the first direction X is allowed to be greater than 0°. This allows the second connecting part 42 to move closer to the first connecting part 41 when the support 20 contracts as the ambient temperature decreases, and the second connecting part 42 to move away from the first connecting part 41 when the support 20 expands as the ambient temperature increases.

[0067] In some embodiments, the length of the support 20 extending in the first direction X is greater than the length of the support 20 extending in the third direction Y.

[0068] The connecting piece 40 connects the acquisition plate 30 and the battery cell 10 fixed by the bracket 20. Therefore, the connecting piece 40 and the acquisition plate 30 are located on the same side of the bracket 20 in the second direction Z. The deformation of the bracket 20 in the second direction Z will cause the connecting piece 40 and the acquisition plate 30 to have the same tendency to move. Therefore, the distance between the first connecting part 41 and the second connecting part 42 of the same connecting piece 40 in the second direction Z is relatively small. In the direction perpendicular to the second direction Z, the deformation of the bracket 20 has a greater impact on the shape of the connecting piece 40. The extension length of the bracket 20 in the first direction X is greater than its extension length in the third direction Y. With the change of temperature, the deformation of the bracket 20 in the first direction X is relatively larger than that in the third direction Y. In the same connecting piece 40, at least in the first direction X, the first connecting part 41 is closer to the structural center P of the bracket 20 than the second connecting part 42. Therefore, through the elastic deformation of the elastic transition part 43, the connecting piece 40 can be deformed to adapt to the applied deformation, so that the connecting piece 40 can be stably connected between the battery cell 10 and the acquisition plate 30. The deformation of the connecting piece 40 is mainly used to accommodate the deformation of the support 20 in the direction of its longer extension.

[0069] See Figure 3 and Figure 5 In some embodiments, along the extension path from the first connecting portion 41 to the second connecting portion 42, at least one side of the elastic transition portion 43 is provided with a notch 431. Furthermore, the cross-sectional area of ​​the elastic transition portion 43 at the notch 431 is smaller than the cross-sectional area at either location of the first connecting portion 41 or the second connecting portion 42.

[0070] By setting a notch 431, the structure of the elastic transition part 43 at the notch 431 is relatively weak, making it easier to deform under force. This increases the possibility of inducing elastic deformation of the elastic transition part 43 when the temperature changes, so that the first connecting part 41 and the second connecting part 42 of the same connecting piece 40 can move relative to each other to adapt to the deformation of the bracket 20.

[0071] Understandably, in some embodiments, the connecting piece 40 is a sheet-like structure, and the notch 431 of the elastic transition portion 43 extends through both sides along the thickness direction of the sheet-like structure. In other embodiments, the notch 431 may not extend through the opposite sides of the elastic transition portion 43, but may appear as a "pit".

[0072] Understandably, in some embodiments, the notch 431 is arc-shaped along the extension path from the first connecting portion 41 to the second connecting portion 42. When the notch 431 is located between the first connecting portion 41 and the second connecting portion 42, the interface between the notch 431 and the surface of the adjacent elastic transition portion 43 is smoothly transitioned. When the notch 431 is in contact with the first connecting portion 41, the interface between the notch 431 and the surface of the first connecting portion 41 is smoothly transitioned. When the notch 431 is in contact with the second connecting portion 42, the interface between the notch 431 and the surface of the second connecting portion 42 is smoothly transitioned. Since the notch 431 itself and the notch 431 in contact with the connected structure are arc-shaped, the stress concentration at the notch 431 is reduced when the elastic transition portion 43 elastically deforms, thus reducing the possibility of the notch 431 breaking directly due to deformation, which helps maintain the structural integrity of the connecting piece 40. Therefore, even if the elastic transition portion 43 deforms, the connecting piece 40 can still be connected between the battery cell 10 and the acquisition board 30 to maintain the normal operation of the acquisition board 30. In other embodiments, the notch 431 can be other shapes such as triangles or squares.

[0073] See Figure 3 and Figure 4 In some embodiments, the acquisition plate 30 is located on one side of the support 20. A connecting piece 40 is disposed between the support 20 and the acquisition plate 30. The acquisition plate 30 has a first connecting hole 31 and a second connecting hole 32. The first connecting part 41 is fixedly connected to the acquisition plate 30 through the first connecting hole 31. The second connecting part 42 is exposed on the side of the acquisition plate 30 opposite to the support 20 through the second connecting hole 32.

[0074] By providing the first connection hole 31, the structure connecting the acquisition plate 30 and the connecting piece 40 can directly pass through the first connection hole 31, facilitating direct connection of the acquisition plate 30 and the connecting piece 40 from the side of the acquisition plate 30 away from the bracket 20. Furthermore, by providing the second connection hole 32, the second connection part 42 can be exposed from the side of the acquisition plate 30 away from the bracket 20. The structure connecting the battery cell 10 and the connecting piece 40 can pass through the second connection hole 32, and the second connection part 42 can be directly observed, facilitating connection of the battery cell 10 and the connecting piece 40 from the side of the acquisition plate 30 away from the bracket 20.

[0075] In some embodiments, the diameter of the second connecting hole 32 is larger than the diameter of the first connecting hole 31. The diameter of the first connecting hole 31 is smaller to reduce the opening area on the acquisition board 30, facilitating the routing of circuits on the acquisition board 30. The diameter of the second connecting hole 32 is larger to increase the visible area for observing the second connecting portion 42 of the connecting piece 40, facilitating the connection between the battery cell 10 and the connecting piece 40.

[0076] It is understood that in some embodiments, the first connecting hole 31 and / or the second connecting hole 32 may not be circular. In this case, the diameter of the second connecting hole 32 being larger than the diameter of the first connecting hole 31 means that the cross-sectional area of ​​the second connecting hole 32 is larger than the cross-sectional area of ​​the second connecting hole 32.

[0077] See Figure 6 In some embodiments, the elastic transition portion 43 is an arched structure and is configured to arch and deform toward the bracket 20 or the acquisition plate 30 to allow the first connection portion 41 and the second connection portion 42 to move relative to each other.

[0078] When the support 20 shrinks as the temperature decreases, the arched structure of the elastic transition part 43 can induce the elastic transition part 43 itself to deform by increasing the arch amplitude, thereby satisfying the need for the first connecting part 41 and the second connecting part 42 to move closer to each other.

[0079] As the support 20 expands with increasing temperature, the arched structure of the elastic transition portion 43 can flatten and deform to meet the need for the first connecting portion 41 and the second connecting portion 42 to move away from each other.

[0080] See Figure 7 In some embodiments, the resilient transition portion 43 has a first transition segment 432, a second transition segment 433, and a third transition segment 434. The first transition segment 432 is connected to the first connecting portion 41. The second transition segment 433 is connected to the second connecting portion 42. The first transition segment 432 and the second transition segment 433 are respectively bent and connected to the third transition segment 434. The resilient transition portion 43 is configured to be bend and deformable between the first transition segment 432 and the third transition segment 434, and between the second transition segment 433 and the third transition segment 434, to allow relative movement between the first connecting portion 41 and the second connecting portion 42.

[0081] When the support 20 shrinks as the temperature decreases, the bending fit structure between the first transition section 432 and the third transition section 434, as well as the bending fit structure between the second transition section 433 and the third transition section 434, can induce the two bending fit structures to further bend and fold the elastic transition part 43 by increasing the bending amplitude, so as to meet the need for the first connecting part 41 and the second connecting part 42 to move closer to each other.

[0082] As the support 20 expands with increasing temperature, the bending structure between the first transition section 432 and the third transition section 434 can be flattened and deformed, and the bending structure between the second transition section 433 and the third transition section 434 can be flattened and deformed, thus satisfying the need for the first connecting part 41 and the second connecting part 42 to be far apart from each other.

[0083] Understandably, in some embodiments, the transitions between the first transition segment 432 and the third transition segment 434, as well as between the second transition segment 433 and the third transition segment 434, are smooth arc-shaped transitions, which helps to reduce stress concentration. In other embodiments, the transitions between the first transition segment 432 and the third transition segment 434, as well as between the second transition segment 433 and the third transition segment 434, may also be folded-face transitions.

[0084] In other embodiments, the elastic transition portion 43 may also be of other shapes, as long as it can elastically deform to allow the first connecting portion 41 and the second connecting portion 42 of the same connecting piece 40 to move closer to or further away from each other.

[0085] See Figure 5 In some embodiments, the connecting piece 40 is a nickel sheet, which has good conductivity and can be deformed.

[0086] In some embodiments, the first connecting portion 41, the second connecting portion 42, and the elastic transition portion 43 of the same connecting piece 40 are integrally formed. The connecting piece 40 can be manufactured by one or more of the following manufacturing processes: stamping, forging, cutting, or casting. These are conventional technical means known to those skilled in the art and will not be described in detail here.

[0087] See Figure 6 and Figure 7 In some embodiments, the first connecting part 41 and the acquisition board 30 are welded together, and the second connecting part 42 and the battery cell 10 are welded together, which can provide better connection stability.

[0088] In this application, the perpendicularity between the two does not mean an absolute 90° relationship, and the parallelism between the two does not mean an absolute 180° relationship. A certain deviation is allowed, as long as it does not hinder the elastic deformation of the connecting piece 40.

[0089] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: Battery cell; A support frame, to which the battery cell is fixed, the support frame being configured to contract toward its structural center as the ambient temperature decreases; The data acquisition board is configured to acquire the operating data of the battery cell; The connecting piece includes a first connecting portion, a second connecting portion, and an elastic adapter portion. The first connecting portion is electrically connected to and fixed relative to the acquisition board. The second connecting portion is electrically connected to and fixed relative to the battery cell. The first connecting portion of the same connecting piece is closer to the structural center of the bracket than the second connecting portion. The first connecting portion and the second connecting portion are respectively connected to the two ends of the elastic adapter portion. The elastic adapter portion is configured to be elastically deformable to allow the second connecting portion to move closer to the first connecting portion.

2. The battery pack according to claim 1, characterized in that, The bracket is configured to expand away from its structural center as the ambient temperature rises, and the elastic transition portion is configured to elastically deform to allow the second connection portion to move away from the first connection portion.

3. The battery pack according to claim 1, characterized in that, The battery cells are provided in multiple locations, and the connecting pieces are provided in multiple locations. Different connecting pieces are configured to connect between the acquisition board and different battery cells. The multiple connecting pieces are arranged sequentially at intervals along a straight line, and this straight line is defined to be parallel to a first direction. A plane perpendicular to the first direction and passing through the structural center of the bracket is defined as a defined interface. In each of the connecting pieces located on both sides of the defined interface, the first connecting portion is relatively close to the defined interface in the first direction relative to the second connecting portion.

4. The battery pack according to claim 3, characterized in that, The acquisition plate is located on one side of the bracket, and the distribution direction of the acquisition plate and the bracket is defined to be parallel to the second direction. The first direction is perpendicular to the second direction, and a third direction is defined to be perpendicular to the first direction and the second direction. The length of the bracket extending in the first direction is greater than the length of the bracket extending upward in the third direction.

5. The battery pack according to claim 1, characterized in that, The elastic transition portion has an arched structure and is configured to arch and deform toward the bracket or the acquisition plate to allow relative movement between the first connection portion and the second connection portion.

6. The battery pack according to claim 1, characterized in that, The elastic transition portion has a first transition segment, a second transition segment, and a third transition segment. The first transition segment is connected to the first connecting portion, and the second transition segment is connected to the second connecting portion. The first transition segment and the second transition segment are respectively bent and connected to the third transition segment. The elastic transition portion is configured to be able to bend and deform between the first transition segment and the third transition segment, as well as between the second transition segment and the third transition segment, so as to allow the first connecting portion and the second connecting portion to move relative to each other.

7. The battery pack according to claim 1, characterized in that, Along the extension path from the first connecting portion to the second connecting portion, at least one side of the elastic transition portion is provided with a notch, and the cross-sectional area of ​​the elastic transition portion at the notch is smaller than the cross-sectional area at any position of the first connecting portion and the second connecting portion.

8. The battery pack according to claim 1, characterized in that, The acquisition plate is located on one side of the bracket, and the connecting piece is disposed between the bracket and the acquisition plate. The acquisition plate is provided with a first connecting hole and a second connecting hole. The first connecting part is fixedly connected to the acquisition plate through the first connecting hole, and the second connecting part is exposed on the side of the acquisition plate away from the bracket through the second connecting hole.

9. The battery pack according to claim 8, characterized in that, The diameter of the second connecting hole is larger than the diameter of the first connecting hole.

10. An energy storage device, characterized in that, It includes a housing and a battery pack as described in any one of claims 1 to 9, wherein the battery pack is disposed within the housing.

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