Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a battery monomer group, an end plate, a flexible circuit board and a reinforcing member, the battery monomer group comprises at least one battery monomer arranged along a first direction; the end plate is arranged at at least one end of the battery monomer group along a first direction, and the end plate is provided with a wall surface extending parallel to the first direction; the flexible circuit board is arranged on one side of the battery monomer group along a second direction and is electrically connected with the battery monomer group, and the second direction is the height direction of the battery monomers; the reinforcing piece comprises a plate body and a limiting structure which are connected, the plate body is connected with the wall face of the end plate, and the limiting structure and the plate body are arranged in a spaced mode in the second direction to form a mounting position; wherein the first direction intersects with the second direction, the two ends of the mounting position are communicated in the first direction, and the flexible circuit board penetrates through the mounting position and is in sliding fit with the reinforcing part. The battery device can reduce the warping and cracking defects of the flexible circuit board while absorbing the expansion allowance of the battery monomer.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery device and an electrical device. Background Art

[0002] During long-term use of the battery, the internal battery cells will expand in the thickness direction and squeeze the end plates at both ends to move.

[0003] This process can easily cause the flexible circuit board connected to the end plate to crack or warp, which in turn has an adverse effect on the reliability of the battery. Utility Model Content

[0004] The embodiments of the present application provide a battery device and an electrical device, which can limit the warping of the flexible circuit board in the height direction of the battery cell, and alleviate the problem of cracking of the flexible circuit board caused by the expansion of the battery cell and the movement of the end plate.

[0005] In a first aspect, an embodiment of the present application provides a battery device, which includes a battery cell group, an end plate, a flexible circuit board and a reinforcement member, wherein the battery cell group includes at least one battery cell arranged along a first direction; the end plate is arranged at at least one end of the battery cell group along the first direction, and the end plate has a wall extending parallel to the first direction; the flexible circuit board is arranged at one side of the battery cell group along a second direction and is electrically connected to the battery cell group, and the second direction is the height direction of the battery cell; the reinforcement member includes a connected plate body and a limiting structure, the plate body is connected to the wall of the end plate, and along the second direction, the limiting structure and the plate body are spaced apart to form a mounting position; wherein the first direction intersects with the second direction, and along the first direction, both ends of the mounting position are connected, and the flexible circuit board is penetrated through the mounting position and slidably cooperates with the reinforcement member.

[0006] In the technical solution of the embodiment of the present application, the end plate is used to clamp the battery cell group, and the flexible circuit board is connected to the end plate through a reinforcing member. The reinforcing member includes a plate body and a limiting structure. The limiting structure can limit the jumping of the flexible circuit board in the height direction of the battery cell and reduce the possible warping of the flexible circuit board. An installation position for the flexible circuit board to pass through is also formed between the limiting structure and the plate body. When the battery cell assembly expands and squeezes the end plate along the first direction, the reinforcing member moves with the end plate and slides relative to the flexible circuit board, reducing the tensile deformation of the flexible circuit board when the battery cell expands, reducing the probability of cracking of the flexible circuit board, and improving the reliability of the battery.

[0007] In some embodiments, the limiting structure includes a limiting portion and a spacing portion that are intersecting and connected, the limiting portion is connected to the board body through the spacing portion, and the distance between the limiting portion and the board body is at least greater than the thickness of the flexible circuit board.

[0008] In the above optional embodiments, the limiting portion is relatively fixedly connected to the board body through the spacing portion, and sufficient space is reserved between the limiting portion and the board body to facilitate the assembly of the flexible circuit board to the reinforcing member.

[0009] In some embodiments, the limiting structure further includes a crimping portion, which is disposed on a side of the limiting portion facing the flexible circuit board, and the shortest distance between the crimping portion and the board body is less than or equal to the thickness of the flexible circuit board.

[0010] In the above optional embodiments, the limiting structure can maintain contact with the flexible circuit board through the crimping portion, and the crimping portion applies a load to the flexible circuit board to reduce the relative movement between the flexible circuit board and the reinforcing member.

[0011] In some embodiments, both ends of the limiting portion along the third direction are provided with spacers, the distance between the two spacers in the third direction is greater than or equal to the size of the flexible circuit board in the third direction, and the third direction is the width direction of the battery cell.

[0012] In the above optional embodiments, the limiting portion is arranged across the flexible circuit board along the width direction of the battery cell, limiting the jumping range of the entire area of ​​the flexible circuit board in the third direction, and at the same time, the spacing between the two spacers is greater than or equal to the width of the flexible circuit board so that the flexible circuit board can move smoothly relative to the limiting structure.

[0013] In some embodiments, the crimping portion is provided with a first transition curved surface, and the first transition curved surface forms point contact or line contact with the flexible circuit board.

[0014] In the above optional embodiment, the contact area between the crimping portion and the flexible circuit board is reduced, thereby reducing the static friction between the crimping portion and the flexible circuit board, so that the flexible circuit board can move relative to the crimping portion.

[0015] In some embodiments, the crimping portion satisfies at least one of the following conditions:

[0016] (1) The elastic modulus of the crimping portion is greater than the elastic modulus of the spacing portion;

[0017] (2) The stiffness of the crimping part is less than that of the spacing part;

[0018] (3) The thickness of the crimping portion is smaller than the thickness of the spacing portion.

[0019] In the above optional embodiments, when the battery cell expands and squeezes the end plate, the crimping portion can deform before the spacing portion to reduce the load applied by the reinforcement to the flexible circuit board in the expansion direction, thereby reducing the probability of the flexible circuit board being pulled and cracked.

[0020] In some embodiments, two limiting structures are arranged along the third direction. In each limiting structure, the end away from the other limiting structure is connected to the board body, and the end close to the other limiting structure is spaced from the board body and provided with a crimping portion. The third direction is the width direction of the battery cell.

[0021] In the above optional embodiment, the limiting structure is open on one side and two are arranged facing each other, applying load to both sides of the flexible circuit board in the third direction to reduce the probability of warping of the side of the flexible circuit board and reduce the space occupied by the reinforcement component inside the battery device.

[0022] In some embodiments, the distance between the two limiting structures along the third direction is greater than or equal to the size of the flexible circuit board in the third direction.

[0023] In the above optional embodiment, the flexible circuit board can move smoothly relative to the reinforcing member in the first direction to absorb the expansion of the battery cell group.

[0024] In some embodiments, the crimping portion is tilted toward a side close to another limiting structure.

[0025] In the above optional embodiment, the coverage of the limiting structure on the flexible circuit board in the third direction is extended, and the crimping portion forms lateral pressure on the flexible circuit board to reduce the pulling force of the reinforcing member on the flexible circuit board when the battery cell expands.

[0026] In some embodiments, the crimping portion is provided with a second transition curved surface, and the second transition curved surface forms point contact or line contact with the flexible circuit board.

[0027] In the above optional embodiments, the contact area between the crimping portion and the flexible circuit board is reduced, thereby reducing the friction between the crimping portion and the flexible circuit board, so that the flexible circuit board can move relative to the reinforcing member to absorb the expansion of the battery cell group.

[0028] In some embodiments, the limiting structure further includes a deviation-tolerant portion, which is disposed on a side of the spacing portion facing the flexible circuit board and is smoothly transitionally connected to the board body.

[0029] In the above optional embodiment, when the flexible circuit board moves in the third direction, the flexible circuit board can slide along the tolerance portion, thereby reducing the probability of the flexible circuit board being damaged by colliding with the spacing portion.

[0030] In some embodiments, a groove is formed in the flexible circuit board, and the longest distance between the limiting portion and the flexible circuit board is smaller than the thickness of the crimping portion so that the crimping portion extends into the groove.

[0031] In the above optional embodiments, the crimping portion extending into the groove can reduce the contact wear between the crimping portion and the area outside the groove, and the groove wall of the groove can limit the crimping portion from moving significantly in the first direction or the third direction by abutting against the crimping portion.

[0032] In some embodiments, the flexible circuit board is recessed in a direction away from the limiting portion to form a groove, or the groove is provided through the flexible circuit board in a thickness direction.

[0033] In the above optional embodiments, the recessed grooves can reduce the impact of the grooves on the functions of the flexible circuit board, and the grooves that penetrate the flexible circuit board are easy to process and prepare.

[0034] In some embodiments, a ratio of a dimension of the crimping portion in the first direction to a dimension of the crimping portion in the third direction falls within a range of 0.25-4.

[0035] In the above optional embodiments, the crimping portion can cooperate with the groove to simultaneously limit the movement range of the flexible circuit board in the first direction and the third direction.

[0036] In some embodiments, the plate body is detachably connected to the wall surface of the end plate.

[0037] In the above optional embodiments, the reinforcing member can be prepared by molding separately, which reduces the difficulty of processing the end plate and facilitates the assembly of the reinforcing member into the battery device.

[0038] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device provided by any of the aforementioned embodiments, and the battery device is used to provide electrical energy.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0042] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0043] Figure 3 A schematic diagram of the exploded structure of a battery cell group according to some embodiments of the present application;

[0044] Figure 4 A schematic diagram of the structure of a battery device according to some embodiments of the present application;

[0045] Figure 5 A schematic diagram of the structure of a reinforcing member in a battery device in some embodiments of the present application;

[0046] Figure 6 A schematic diagram of the structure of a battery device according to some embodiments of the present application;

[0047] Figure 7 Schematic diagram of the structure of a battery device according to some embodiments of the present application.

[0048] The reference numerals in the specific implementation manner are as follows:

[0049] 1000. Vehicles;

[0050] 100, battery device; 200, controller; 300, motor;

[0051] 10. Box body; 11. First box body portion; 12. Second box body portion;

[0052] 20. Battery cell group; 21. Battery cell;

[0053] 30. Flexible circuit board; 301. Grooving;

[0054] 40. End plate;

[0055] 50. reinforcement member; 51. plate body; 52. limiting structure;

[0056] 521, limiting portion; 522, spacing portion; 5221, deviation tolerance portion; 523, crimping portion;

[0057] The first direction is X; the second direction is Z; the third direction is Y. DETAILED DESCRIPTION

[0058] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0061] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0063] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0064] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] As a common energy storage cell, a battery pack usually integrates a battery cell, an end plate and a flexible circuit board for sampling. The end plate is fixed at one end of the battery cell arrangement direction to clamp the battery cell, and the flexible circuit board is fixed to the end plate by bonding.

[0067] During the long-term use of the battery pack, the battery cells expand in their thickness direction after multiple charges and discharges. This expansion will squeeze the end plate and cause the end plate to move in the thickness direction of the battery cell. The flexible circuit board fixed to the end plate will move along with it, which may be easily broken by stress and pulling, affecting the normal use of the battery pack.

[0068] In the related art, a redundant structure with an arch is set in the thickness direction of the battery cell on the flexible circuit board to absorb expansion displacement and avoid cracking. However, on the one hand, this redundant structure occupies the internal space of the battery pack and is prone to interfere with other components; on the other hand, this redundant structure may cause the part of the flexible circuit board bonded to the end plate to warp during the process of absorbing expansion, which has an adverse effect on the reliability of the battery pack.

[0069] Based on the above considerations, an embodiment of the present application provides a battery device, in which a reinforcement piece is added to the end plate for clamping the battery cell group. The reinforcement piece slides with the flexible circuit board and can limit the warping of the flexible circuit board. At the same time, when the battery cell group expands and squeezes the end plate, the reinforcement piece can slide relative to the flexible circuit board, thereby absorbing the expansion and reducing the pulling and cracking of the flexible circuit board.

[0070] The solution of the embodiment of the present application can be applied to, but not limited to, a battery device including a battery cell group, and can also be applied to an electrical device including a battery cell group and a battery device.

[0071] The present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0072] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0073] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0074] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] The battery device 100 mentioned in the embodiment of the present application may include one or more battery cell groups 20 for providing voltage and capacity. The battery cell group may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in hybrid connection through a busbar.

[0076] In some embodiments, a battery cell group is generally formed by arranging a plurality of battery cells; as an example, the battery cell group may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0077] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0078] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0079] In some embodiments, the battery device 100 may be a battery pack, which includes a case and one or more battery cell groups 20 , wherein the battery cell group 20 is accommodated in the case.

[0080] See also Figure 2 , Figure 2 The schematic diagram of the exploded structure of the battery device 100 provided in some embodiments of the present application is as follows. The battery device 100 includes a box body 10 and a battery cell group 20 , wherein the battery cell group 20 is accommodated in the box body 10 .

[0081] The box 10 is used to accommodate battery cells, and the box 10 can be of various structures. In some embodiments, the box 10 can include a first box portion 11 and a second box portion 12, and the first box portion 11 and the second box portion 12 cover each other, and the first box portion 11 and the second box portion 12 jointly define a receiving portion for accommodating the battery cell group 20. The second box portion 12 can be a hollow structure with one end open, and the first box portion 11 is a plate-shaped structure, and the first box portion 11 covers the open side of the second box portion 12 to form a box 10 with a receiving portion; the first box portion 11 and the second box portion 12 can also be hollow structures with one side open, and the open side of the first box portion 11 covers the open side of the second box portion 12 to form a box 10 with a receiving portion. Of course, the first box portion 11 and the second box portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0082] As an example, the battery cell group 20 may be a battery module, and the battery cell group 20 may be accommodated in a box by fixing the battery module in the box.

[0083] As an example, the battery cell group 20 may also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0084] In some embodiments, the box can be used as part of the chassis structure of the vehicle 1000. For example, part of the box can become at least part of the floor of the vehicle 1000, or part of the box can become at least part of the cross beam and longitudinal beam of the vehicle 1000.

[0085] In some embodiments, the battery device 100 may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0086] See also Figure 3 , Figure 3The schematic diagram of the structure of a battery cell group 20 provided in an embodiment of the present application is as follows. The battery cell group 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are first connected in series, in parallel, or in mixed series to form the battery cell group 20, and then the battery cell group 20 is accommodated in a box.

[0087] According to some embodiments of the present application, please refer to Figures 4 to 5 , Figure 4 A schematic diagram of the structure of a battery device 100 provided in an embodiment of the present application is shown in FIG. Figure 5 A schematic diagram of the structure of a reinforcing member 50 in a battery device provided in an embodiment of the present application. An embodiment of the present application provides a battery device 100, which includes a battery cell group 20, an end plate 40, a flexible circuit board 30, and a reinforcing member 50. The battery cell group 20 includes at least one battery cell arranged along a first direction, the end plate 40 is disposed at at least one end of the battery cell group 20 along the first direction, the flexible circuit board 30 is disposed at one side of the battery cell group 20 along a second direction and is electrically connected to the battery cell group 20, the second direction is the height direction of the battery cell, and the first direction intersects with the second direction. Among them, the end plate 40 has a wall extending parallel to the first direction, the reinforcing member 50 is connected to the wall of the end plate 40 and has a mounting position, along the first direction, the two ends of the mounting position are through, the flexible circuit board 30 is penetrated in the mounting position and slidably cooperates with the reinforcing member 50.

[0088] Specifically, the reinforcing member 50 includes a plate body 51 and a limiting structure 52 connected to each other. The plate body 51 is connected to the wall surface of the end plate 40. Along the second direction, the limiting structure 52 and the plate body 51 are spaced apart to form an installation position for the flexible circuit board 30 to pass through.

[0089] As shown in the figure, the first direction X is the thickness direction of the battery cell, and the second direction Z is the height direction of the battery cell.

[0090] The flexible circuit board 30 refers to a printed circuit board made of a flexible insulating substrate. The flexible circuit board 30 can electrically connect at least one battery cell to form a complete battery system, and realize real-time monitoring and transmission of parameters such as temperature and voltage inside the battery system to maintain safe operation of the battery system.

[0091] The reinforcement member 50 is a component whose material strength is greater than that of the flexible circuit board 30. The reinforcement member 50 can be rigidly connected to the end plate 40 or other components in the battery device 100 to achieve relative fixation of the reinforcement member 50 itself in the battery device 100. By connecting with the reinforcement member 50, the flexible circuit board 30 can be arranged inside the battery device 100 in a specific assembly relationship to maintain its stable electrical connection with the battery cell group 20.

[0092] The end plate 40 is a plate disposed at the outermost side of the battery cell group 20 in the arrangement direction, and is used to clamp and protect the battery cells inside the battery cell group 20 . The end plate 40 and the battery cell group 20 are disposed on the same side of the flexible circuit board 30 .

[0093] Optionally, the end plates 40 are disposed on both sides of the arrangement direction of the battery cell group 20 , one of the end plates 40 is provided with a reinforcing piece 50 to connect to the flexible circuit board 30 , or both end plates 40 are provided with a reinforcing piece 50 to connect to the flexible circuit board 30 .

[0094] Optionally, see Figure 4 The end plate 40 is disposed on one side of the arrangement direction of the battery cell group 20 and is connected to the flexible circuit board 30 through the reinforcing member 50 .

[0095] Therefore, when the battery cell expands, the battery cell squeezes the end plate 40 in the thickness direction of the battery cell and forces the end plate 40 to move, and the reinforcing piece 50 moves with the end plate 40 and slides relative to the flexible circuit board 30, so as to reduce the tearing force on the flexible circuit board 30 caused by the movement of the end plate 40, and reduce the probability of cracking of the flexible circuit board 30. At the same time, along the height direction of the battery cell, the flexible circuit board 30 is located between the limiting structure 52 of the reinforcing piece 50 and the board body 51, which limits the warping of the flexible circuit board 30 during the sliding process.

[0096] According to some embodiments of the present application, optionally, refer to Figures 5 to 7 The limiting structure 52 includes a limiting portion 521 and a spacing portion 522 that are intersecting and connected. The limiting portion 521 is connected to the board body 51 through the spacing portion 522. The distance between the limiting portion 521 and the board body 51 is at least greater than the thickness of the flexible circuit board 30.

[0097] The limiting portion 521 refers to a portion located above the flexible circuit board 30 along the second direction Z. The limiting portion 521 is arranged parallel to the board body 51 to limit the warping of the flexible circuit board 30 in the height direction of the battery cell.

[0098] The spacing portion 522 refers to a component between the limiting portion 521 and the plate body 51 , and is used to relatively and fixedly connect the limiting portion 521 and the plate body 51 at a preset interval.

[0099] Thus, the limiting portion 521 is relatively fixedly connected to the board body 51 through the spacing portion 522 , and sufficient space is reserved to facilitate the assembly of the flexible circuit board 30 to the reinforcing member 50 .

[0100] According to some embodiments of this application, please continue to refer to Figures 5 to 7The limiting structure 52 further includes a crimping portion 523 , which is disposed on a side of the limiting portion 521 facing the flexible circuit board 30 , and the shortest distance between the crimping portion 523 and the board body 51 is less than or equal to the thickness of the flexible circuit board 30 .

[0101] The crimping portion 523 refers to the portion that first contacts the flexible circuit board 30 in the height direction of the battery cell when the reinforcing plate slides relative to the flexible circuit board 30. Figure 5 or Figure 6 After assembly is completed, the crimping portion 523 contacts the flexible circuit board 30 along the height direction of the battery cell. When the flexible circuit board 30 slides relative to the reinforcement member 50, the crimping portion 523 slides and rubs against the flexible circuit board 30 to maintain the limiting effect of the limiting structure 52 during the sliding process of the flexible circuit board 30.

[0102] Optionally, one or more crimping parts 523 are provided along the width direction of the battery cell.

[0103] Thus, the crimping portion 523 can maintain contact with the flexible circuit board 30, so that regardless of whether the flexible circuit board 30 slides relative to the reinforcement member 50, the limiting structure 52 can apply pressure to the flexible circuit board 30 through the crimping portion 523 to reduce possible warping in the height direction of the battery cell.

[0104] According to some embodiments of the present application, please refer to Figure 5 , both ends of the limiting portion 521 along the third direction Y are provided with a spacer portion 522 , and the distance between the two spacers 522 in the third direction Y is greater than or equal to the size of the flexible circuit board 30 in the third direction Y.

[0105] As shown in the figure, the third direction Y is the width direction of the battery cell, and the third direction Y intersects with the first direction X and can define a plane parallel to the wall surface of the end plate 40 .

[0106] The limiting portion 521 and the two spacing portions 522 are arranged in a bridge shape above the board body 51 and define a closed installation position, which is only penetrated at both ends in the first direction X, so that the flexible circuit board 30 can move relative to the reinforcement member 50 to absorb the expansion of the battery cell group 20.

[0107] Thus, the limiting portion 521 can limit the movement of the entire area of ​​the flexible circuit board 30 in the third direction Y, reduce the probability of warping of the flexible circuit board 30, and allow the flexible circuit board 30 to slide smoothly in the first direction X.

[0108] According to some embodiments of the present application, the crimping portion 523 is provided with a first transition curved surface, and the first transition curved surface forms a point contact or a line contact with the flexible circuit board 30 .

[0109] For example, see Figure 5 The first transition curved surface is a hemispherical structure, and the hemispherical structure is in point contact with the flexible circuit board 30 to reduce the dynamic friction of the crimping portion 523 during the relative sliding process of the flexible circuit board 30.

[0110] Exemplarily, the size of the first transition surface in the third direction Y is smaller than the size of the first transition surface in the first direction X. The crimping portion 523 is a long strip-shaped member extending along the first direction X to reduce the dynamic friction of the crimping portion 523 during relative sliding of the flexible circuit board 30.

[0111] Thus, the wear of the flexible circuit board 30 by the crimping portion 523 is reduced when the flexible circuit board 30 slides relative to the reinforcing member 50 .

[0112] According to some embodiments of the present application, the elastic modulus of the crimping portion 523 is greater than the elastic modulus of the spacing portion 522 .

[0113] Optionally, the spacer 522 is a plastic part to achieve a relatively fixed connection between the limiting part 521 and the plate body 51, and the crimping part 523 is an elastic structural part or the part of the crimping part 523 that contacts the flexible circuit board 30 is coated with an elastic structure. For example, the elastic structure is a rubber part, a silicone part or other components with elastic deformation ability. Therefore, when the battery cell group 20 expands and squeezes the end plate 40, flexible friction occurs between the flexible circuit board 30 and the reinforcement 50 to reduce the pulling force on the flexible circuit board 30 and reduce crack damage.

[0114] According to some embodiments of the present application, the rigidity of the crimping portion 523 is smaller than the rigidity of the spacing portion 522 .

[0115] According to some embodiments of the present application, the thickness of the crimping portion 523 is smaller than the thickness of the spacing portion 522 .

[0116] Therefore, when the battery cell group 20 expands and squeezes the end plate 40, the flexible circuit board 30 slides relative to the reinforcement 50, and the crimping portion 523 can deform before the spacer portion 522, reducing the load applied by the crimping portion 523 to the flexible circuit board 30 in the first direction X, thereby reducing the probability of the flexible circuit board 30 being pulled and cracked while maintaining pressure on the crimping portion 523.

[0117] According to some embodiments of the present application, please refer to Figure 6 or Figure 7 Two limiting structures 52 are arranged along the third direction Y. In each limiting structure 52, one end away from the other limiting structure 52 is connected to the plate body 51, and the end close to the other limiting structure 52 is spaced from the plate body 51 and is provided with a crimping portion 523.

[0118] Thus, the limiting structure 52 is opened on one side and two are arranged facing each other, and the two crimping parts 523 can further enhance the pressure effect of the reinforcing member 50 on the flexible circuit board 30, so as to further reduce the probability of the flexible circuit board 30 being warped in the height direction of the battery cell. At the same time, the limiting structure 52 is only arranged on the side area of ​​the flexible circuit board 30, which helps to reduce the space occupied by the reinforcing member 50 inside the battery device.

[0119] According to some embodiments of the present application, the distance between the two limiting structures 52 along the third direction Y is greater than or equal to the size of the flexible circuit board 30 in the third direction Y.

[0120] Exemplarily, the distance between the two limiting structures 52 along the third direction Y is equal to the size of the flexible circuit board 30 in the third direction Y, so as to limit the shaking of the flexible circuit board 30 in the third direction Y during the movement.

[0121] Exemplarily, the distance between the two limiting structures 52 along the third direction Y is greater than the dimension of the flexible circuit board 30 in the third direction Y, so that the flexible circuit board 30 can slide more smoothly in the reinforcing member 50 .

[0122] Thus, the flexible circuit board 30 can smoothly move in the reinforcing member 50 along the first direction X to absorb the expansion of the battery cell group 20 , thereby preventing the flexible circuit board 30 from being stuck in the third direction Y.

[0123] According to some embodiments of the present application, the crimping portion 523 is tilted toward a side close to another limiting structure 52 .

[0124] Optionally, see Figure 6 The crimping portion 523 is a plate-like structure that is arranged obliquely.

[0125] Optionally, the crimping portion 523 is an irregular structure, such as a spring leaf, and at least part of the irregular structure extends parallel to the wall surface to reduce the probability of the irregular structure itself jumping in the first direction X, thereby maintaining the pressing of the flexible circuit board 30 .

[0126] Thus, the coverage of the limiting structure 52 on the flexible circuit board 30 in the third direction Y is extended, and at the same time, the component of the load applied by the crimping portion 523 to the flexible circuit board 30 in the height direction of the battery cell is reduced, thereby reducing the pulling force of the reinforcement member 50 on the flexible circuit board 30 when the battery cell expands.

[0127] According to some embodiments of the present application, the crimping portion 523 is provided with a second transition curved surface, and the second transition curved surface forms point contact or line contact with the flexible circuit board 30 .

[0128] Optionally, the second transition curved surface is a hemispherical structure, and the hemispherical structure is in point contact with the flexible circuit board 30 .

[0129] Optionally, see Figure 6 The size of the second transition curved surface in the third direction Y is smaller than the size of the second transition curved surface in the first direction X. The crimping portion 523 is a long strip-shaped member extending along the first direction X to reduce the dynamic friction of the crimping portion 523 during the relative sliding process of the flexible circuit board 30.

[0130] Thus, the contact area between the crimping portion 523 and the flexible circuit board 30 is reduced, and the friction between the crimping portion 523 and the flexible circuit board 30 is reduced, so that the flexible circuit board 30 can move relative to the reinforcing member 50 to absorb the expansion of the battery cell group 20 .

[0131] According to some embodiments of the present application, please refer to Figure 6 The limiting structure 52 further includes a tolerance portion 5221 , which is disposed on a side of the spacing portion 522 facing the flexible circuit board 30 .

[0132] Optionally, the deviation-tolerant portion 5221 has a smooth curved surface, and the deviation-tolerant portion 5221 is smoothly transitionally connected to the plate body 51 via the smooth curved surface.

[0133] Optionally, the tolerance portion 5221 has an inclined straight surface, and the inclination angle of the tolerance portion 5221 is less than 30°.

[0134] Therefore, when the flexible circuit board 30 shakes in the third direction Y, the flexible circuit board 30 can slide along the tolerance portion 5221 to reduce the probability of collision and breakage between the flexible circuit board 30 and the spacer 522 .

[0135] According to some embodiments of the present application, please refer to Figure 7 The flexible circuit board 30 is provided with a groove 301 , and two grooves 301 are provided corresponding to the crimping portion 523 .

[0136] Optionally, the longest distance between the limiting portion 521 and the flexible circuit board 30 is smaller than the thickness of the crimping portion 523 , so that the crimping portion 523 can extend into the groove 301 and move in the groove 301 following the sliding of the flexible circuit board 30 .

[0137] Thus, the crimping portion 523 extending into the groove 301 can reduce the contact wear between the crimping portion 523 and the area outside the groove 301 , and at the same time, the groove wall of the groove 301 can abut against the crimping portion 523 to limit the large movement of the crimping portion 523 in the first direction X or the third direction Y.

[0138] According to some embodiments of the present application, the flexible circuit board 30 is recessed in a direction away from the limiting portion 521 to form a groove 301 .

[0139] Therefore, the groove 301 can be quickly formed through a stamping process, while reducing the impact of the groove 301 on the layout and function of the flexible circuit board 30.

[0140] According to some embodiments of the present application, the groove 301 is provided through the flexible circuit board 30 along the height direction of the battery cell.

[0141] Therefore, the difficulty of preparing the groove 301 on the flexible circuit board 30 is reduced, and the wear between the crimping portion 523 and the flexible circuit board 30 caused by sliding friction is eliminated.

[0142] According to some embodiments of the present application, a ratio of a dimension of the crimping portion 523 in the first direction X to a dimension of the crimping portion 523 in the third direction Y falls within a range of 0.25 to 0.4.

[0143] Optionally, the ratio of the dimension of the crimping portion 523 in the first direction X to the dimension of the crimping portion 523 in the third direction Y is 1. For example, the crimping portion 523 is a square column structure, or the crimping portion 523 is a cylindrical structure.

[0144] Optionally, a ratio of a dimension of the crimping portion 523 in the first direction X to a dimension of the crimping portion 523 in the third direction Y is one of 0.25, 0.4, 0.5, 0.8, 1.25, 2, 2.5, and 4.

[0145] As a result, the movement range of the crimping portion 523 in the groove 301 is reduced, thereby reducing the probability of the flexible circuit board 30 being significantly deviated in the first direction X or the third direction Y.

[0146] According to some embodiments of the present application, please refer to Figures 5 to 7 The plate body 51 is detachably connected to the wall surface of the end plate 40 .

[0147] Optionally, the plate body 51 and the wall surface of the end plate 40 are relatively fixed via a threaded connection.

[0148] Optionally, the plate body 51 and the limiting structure 52 are an integral structure, for example, the plate body 51 and the limiting structure 52 are integrally formed by an injection molding process.

[0149] Optionally, the plate body 51 and the limiting structure 52 are detachably connected, and the limiting structure 52 is assembled to the plate body 51 to form the reinforcing member 50 .

[0150] Therefore, the reinforcing member 50 can be separately formed and prepared for assembly and connection to the end plate 40 , which reduces the difficulty of processing the end plate 40 and facilitates the assembly of the reinforcing member 50 into the battery device.

[0151] See also Figure 5In one embodiment, the battery device includes a battery cell group 20, a flexible circuit board 30, an end plate 40 and a reinforcing member 50. The end plate 40 is arranged at one end of the battery cell group 20 along the first direction X. The reinforcing member 50 includes a plate body 51 connected to the end plate 40 and a limiting portion 521 spaced apart from the plate body 51. The limiting portion 521 is connected to the plate body 51 through a spacer 522 perpendicular to the plate body 51, and the spacer 522 is transitionally connected to the plate body 51 through a tolerance portion 5221. The limiting portion 521 is provided with a spacer 522 at both ends along the third direction Y, and the distance between the two spacers 522 is greater than the width of the flexible circuit board 30. The limiting portion 521 is provided with a crimping portion 523 on one side facing the flexible circuit board 30. The crimping portion 523 is a hemispherical structure, and the hemispherical structure is in point contact with the flexible circuit board 30. When the battery cell group 20 expands and squeezes the end plate 40, the reinforcing plate follows the end plate 40 to move in the first direction X and slides relative to the flexible circuit board 30. At this time, the crimping portion 523 slides in contact with the flexible circuit board 30 through the hemispherical structure to absorb the expansion of the battery cell group 20. At the same time, the crimping portion 523 maintains contact with the flexible circuit board 30 to limit the jumping amplitude of the flexible circuit board 30 in the height direction of the battery cell.

[0152] See also Figure 6 In one embodiment, the battery device 100 includes a battery cell group 20, a flexible circuit board 30, an end plate 40 and a reinforcing member 50. The end plate 40 is arranged at one end of the battery cell group 20 along a first direction. The reinforcing member 50 includes a plate body 51 connected to the end plate 40 and a limiting portion 521 spaced apart from the plate body 51. The limiting portion 521 is connected to the plate body 51 through a spacer 522 perpendicular to the plate body 51. A tolerance portion 5221 is provided between the spacer 522 and the plate body 51. One end of the limiting portion 521 away from the spacer 522 extends toward the plate body 51 to form a crimping portion 523. The distance between the crimping portion 523 and the plate body 51 is less than the thickness of the flexible circuit board 30. When the battery cell group 20 expands and squeezes the end plate 40, the reinforcement piece 50 follows the end plate 40 to move and slide relative to the flexible circuit board 30, and the crimping portion 523 slides in contact with the flexible circuit board 30 to absorb the expansion of the battery cell and at the same time apply pressure to the flexible circuit board 30 in the height direction of the battery cell to keep the flexible circuit board 30 flat.

[0153] See also Figure 7In one embodiment, the battery device 100 includes a battery cell group 20, a flexible circuit board 30, an end plate 40 and a reinforcing member 50. The end plate 40 is arranged at one end of the battery cell group 20 along a first direction. The reinforcing member 50 includes a board body 51 connected to the end plate 40 and a limiting portion 521 spaced apart from the board body 51. The limiting portion 521 is connected to the board body 51 through a spacing portion 522 perpendicular to the board body 51. The distance between the limiting portion 521 and the board body 51 is slightly greater than the thickness of the flexible battery board. The limiting portion 521 is provided with a crimping portion 523 on one side of the board body 51. The flexible circuit board 30 is provided with a groove 301 matched with the crimping portion 523. The crimping portion 523 extends into the groove 301 and the distance between the crimping portion 523 and the board body 51 is less than the thickness of the flexible circuit board 30. When the battery cell group 20 expands and presses the end plate 40 , the reinforcing member 50 moves following the end plate 40 , the flexible circuit board 30 slides relative to the board body 51 , and the crimping portion 523 moves in the groove 301 .

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell group, comprising at least one battery cell arranged along a first direction; an end plate, disposed at at least one end of the battery cell group along the first direction, the end plate having a wall surface extending parallel to the first direction; a flexible circuit board, disposed on one side of the battery cell group along a second direction and electrically connected to the battery cell group, wherein the second direction is a height direction of the battery cell; A reinforcing member, comprising a plate body and a limiting structure connected to each other, wherein the plate body is connected to the wall surface of the end plate, and along the second direction, the limiting structure and the plate body are spaced apart to form a mounting position; The first direction intersects with the second direction, and along the first direction, two ends of the mounting position are connected, and the flexible circuit board is inserted into the mounting position and slidably cooperates with the reinforcing member.

2. The battery device according to claim 1, characterized in that: The limiting structure includes a limiting portion and a spacing portion that are intersecting and connected, the limiting portion is connected to the board body through the spacing portion, and the distance between the limiting portion and the board body is at least greater than the thickness of the flexible circuit board.

3. The battery device according to claim 2, characterized in that: The limiting structure further includes a crimping portion, which is arranged on a side of the limiting portion facing the flexible circuit board, and the shortest distance between the crimping portion and the board body is less than or equal to the thickness of the flexible circuit board.

4. The battery device according to claim 3, characterized in that: The spacing parts are provided at both ends of the limiting part along the third direction, and the distance between the two spacing parts in the third direction is greater than or equal to the size of the flexible circuit board in the third direction. The third direction is the width direction of the battery cell.

5. The battery device according to claim 4, characterized in that: The crimping portion is provided with a first transition curved surface, and the first transition curved surface forms point contact or line contact with the flexible circuit board.

6. The battery device according to claim 4, characterized in that: The crimping portion satisfies at least one of the following conditions: (1) The elastic modulus of the crimping portion is greater than the elastic modulus of the spacing portion; (2) The rigidity of the crimping portion is smaller than the rigidity of the spacing portion; (3) The thickness of the crimping portion is smaller than the thickness of the spacing portion.

7. The battery device according to claim 3, characterized in that: The limiting structures are provided with two along the third direction. In each of the limiting structures, one end away from the other limiting structure is connected to the plate body, and one end close to the other limiting structure is spaced from the plate body and provided with the crimping portion. The third direction is the width direction of the battery cell.

8. The battery device according to claim 7, characterized in that: The distance between the two limiting structures along the third direction is greater than or equal to the size of the flexible circuit board in the third direction.

9. The battery device according to claim 7, characterized in that: The crimping portion is arranged to be inclined toward a side close to the other limiting structure.

10. The battery device according to claim 9, characterized in that: The crimping portion is provided with a second transition curved surface, and the second transition curved surface forms point contact or line contact with the flexible circuit board.

11. The battery device according to claim 9, characterized in that: The limiting structure further includes a deviation-tolerant portion, which is disposed on a side of the spacing portion facing the flexible circuit board and is smoothly transitionally connected to the board body.

12. The battery device according to claim 7, characterized in that: The flexible circuit board is provided with a groove, and the longest distance between the limiting portion and the flexible circuit board is smaller than the thickness of the crimping portion so that the crimping portion extends into the groove.

13. The battery device according to claim 12, characterized in that: The flexible circuit board is recessed in a direction away from the limiting portion to form the groove, or the groove is provided through the flexible circuit board in a thickness direction.

14. The battery device according to claim 12, characterized in that: A ratio of a dimension of the crimping portion in the first direction to a dimension of the crimping portion in the third direction falls within a range of 0.25 to 4.

15. The battery device according to claim 1, characterized in that: The plate body is detachably connected to the wall surface of the end plate.

16. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 15, wherein the battery device is used to provide electrical energy.

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