Battery pack

Abstract

Provided in the embodiments of the present application is a battery pack. A plurality of battery cells are distributed in an array in a first direction and a second direction; a first connection portion is arranged between two battery cells adjacent to each other in the first direction and is connected to the two battery cells adjacent to each other in the first direction; and a second connection portion is connected to at least one end of the first connection portion in a third direction, wherein the second connection portion intersects the extension direction of the first connection portion, and the second connection portion is connected to the battery cells arranged in the first direction, and / or the second connection portion is connected to the battery cells arranged in the second direction. A cushioning effect between adjacent battery cells can be achieved, and the safety performance of the battery pack is improved; and the plurality of battery cells can be connected into one piece, thereby facilitating enhancing a mode of the battery pack.

Description

A battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 11, 2024, with application number 202410276304.4 and application name “A Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery technology, and specifically relates to a battery pack. Background Art

[0003] Battery packs are an important component of new energy vehicles. As the market share of new energy vehicles continues to grow, the quality of battery packs is receiving more and more attention.

[0004] Because the battery pack contains multiple battery cells and there is no effective connection and fixation between the battery cells, when the battery pack operates in a vibration environment, the connection between adjacent battery cells is prone to failure, resulting in relative displacement, reducing the structural strength of the entire pack. In severe cases, there may even be friction or collision between the battery cells, causing damage to the battery cells and even fire, thereby affecting the safety performance of the battery pack.

[0005] Application Contents

[0006] The present application aims to provide a battery pack to solve the problem that the connection between adjacent battery cells in the existing battery pack is unreliable and prone to failure, which affects the safety performance of the battery pack.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] The present application discloses a battery pack, comprising a box body and a battery module disposed in the box body, wherein the battery module comprises a plurality of battery cells and a fixing connector;

[0009] The plurality of battery cells are distributed in an array along the first direction and the second direction;

[0010] The fixed connector includes a first connecting portion and a second connecting portion, wherein the first connecting portion is disposed between and connects two adjacent battery cells along the first direction; the second connecting portion is connected to at least one end of the first connecting portion along the third direction, the second connecting portion extends in a direction intersecting with the first connecting portion, and the second connecting portion connects the battery cells arranged along the first direction, and / or the second connecting portion connects the battery cells arranged along the second direction;

[0011] The first direction, the second direction, and the third direction intersect with each other.

[0012] Optionally, the battery cell includes two first side walls arranged opposite to each other along the first direction and two second side walls arranged opposite to each other along the second direction, the area of ​​the second side walls is greater than that of the first side walls, and the second side walls are the walls with the largest area of ​​the battery cell;

[0013] The first connecting portion connects the first side walls of two adjacent battery cells along the first direction.

[0014] Optionally, the battery pack further includes a liquid cooling plate; there are at least three battery cells along the first direction, the liquid cooling plate is arranged between two adjacent battery cells along the first direction and connects two adjacent battery cells along the first direction, the liquid cooling plate and the first connecting portion are alternately arranged along the first direction, or the liquid cooling plate and the first connecting portion are spaced apart along the third direction.

[0015] Optionally, the second connecting portion extends along the first direction and / or the second direction;

[0016] There are multiple first connection parts, which are spaced apart along the extending direction of the second connection part and connected to the second connection part. At least one first connection part is provided between two adjacent battery cells along the first direction.

[0017] Optionally, the battery pack further includes a liquid cooling plate, the liquid cooling plate extending along the first direction and disposed between two adjacent battery cells along the second direction;

[0018] The second connection portion extends along the second direction, and a slit structure is formed between two adjacent first connection portions;

[0019] The liquid cooling plate is arranged through the slit structure.

[0020] Optionally, an average size of the slit structure along the second direction is D1 mm, and an average thickness of the liquid cooling plate is D2 mm, satisfying: 1≤D1 / D2≤5.

[0021] Optionally, the fixed connection member further includes a third connection portion, and two adjacent first connection portions are connected at their ends away from the second connection portion via the third connection portion.

[0022] Optionally, the first connecting portion and the second connecting portion are respectively bonded to at least a portion of the battery cell.

[0023] Optionally, a first connecting groove is provided on at least one side of the first connecting portion along the first direction, the first connecting groove is filled with a first adhesive structure, and the first adhesive structure connects the first connecting portion and the battery cell.

[0024] Optionally, a second connecting groove is provided on a side of the second connecting portion close to the battery cell, the second connecting groove is filled with a second adhesive structure, and the second adhesive structure connects the second connecting portion and the battery cell.

[0025] Optionally, the first connecting portion and the second connecting portion are detachably connected.

[0026] Optionally, the first connecting portion and the second connecting portion are integrally connected.

[0027] Optionally, the first connecting portion and the second connecting portion are fixed by welding.

[0028] Optionally, one of a card block and a card slot is provided at one end of the first connecting part close to the second connecting part, and the other of the card block and the card slot is provided on one side of the second connecting part close to the first connecting part, and the card block is engaged with the card slot.

[0029] Optionally, at least one of the first connecting portion and the second connecting portion is provided with a hollow structure, and a reinforcing partition is provided in the hollow structure.

[0030] Optionally, the battery pack further includes a first buffer;

[0031] The first buffer member is respectively provided between the first connecting portion and the adjacent battery cell and between the second connecting portion and the battery cell.

[0032] Optionally, the battery cell includes a shell and a coating layer covering the shell;

[0033] The covering layer is provided with a window portion so as to expose the shell;

[0034] The first connecting portion and / or the second connecting portion are connected to the housing at a position corresponding to the window portion.

[0035] Optionally, the box body includes a second top wall and a second bottom wall arranged along the third direction; the battery module is arranged between the second top wall and the second bottom wall, and the side of the second connecting portion facing away from the first connecting portion is connected to the second top wall or the second bottom wall.

[0036] Optionally, the box body further includes a third side wall disposed between the second top wall and the second bottom wall;

[0037] The battery pack further includes a second buffer member disposed between the third side wall and the battery pack.

[0038] In an embodiment of the present application, the battery pack includes: a plurality of battery cells and a fixed connector; the plurality of battery cells are arrayed along a first direction and a second direction; the fixed connector includes a first connector and a second connector, the first connector being disposed between and connecting two adjacent battery cells along the first direction; the second connector being connected to at least one end of the first connector along the third direction, the second connector extending in a direction intersecting with the first connector extending in a direction intersecting with the first connector, the second connector connecting the battery cells arranged in the first direction, and / or the second connector connecting the battery cells arranged in the second direction; the first direction, the second direction, and the third direction intersecting with each other. Thus, on the one hand, due to the provision of the first connector, the first connector being disposed between and connecting two adjacent battery cells, thereby acting as a buffer between adjacent battery cells, thereby facilitating protection of the battery cells and further improving the safety performance of the battery pack. On the other hand, since the first connecting portion is connected to the second connecting portion at at least one end along the third direction, and the second connecting portion connects the battery cells arranged along the first direction, and / or the second connecting portion connects two adjacent battery cells along the second direction, that is, the first connecting portion and the second connecting portion are respectively connected to at least part of the battery cell, the multiple battery cells in the battery pack can be connected into a whole, which is beneficial to further enhance the structural strength of the battery pack and improve the modal and safety performance of the battery pack.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application.

[0040] 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

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] FIG1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0044] FIG2 is a schematic structural diagram of another battery pack provided in an embodiment of the present application;

[0045] FIG3 is a schematic structural diagram of a first type of fixed connector provided in an embodiment of the present application;

[0046] FIG4 is a schematic diagram of the structure of a second type of fixed connector provided in an embodiment of the present application;

[0047] FIG5 is a second structural diagram of a second type of fixed connection member provided in an embodiment of the present application;

[0048] FIG6 is a schematic structural diagram of a third fixed connection member provided in an embodiment of the present application;

[0049] FIG7 is a schematic structural diagram of a fourth fixed connection member provided in an embodiment of the present application;

[0050] FIG8 is a schematic structural diagram of a fifth fixing connector provided in an embodiment of the present application;

[0051] FIG9 is a schematic structural diagram of a sixth type of fixed connector provided in an embodiment of the present application;

[0052] FIG10 is a schematic structural diagram of a seventh type of fixed connector provided in an embodiment of the present application;

[0053] FIG11 is a second structural diagram of the seventh fixed connection member provided in an embodiment of the present application;

[0054] FIG12 is a schematic structural diagram of an eighth type of fixed connector provided in an embodiment of the present application;

[0055] FIG13 is a schematic structural diagram of a ninth fixing connector provided in an embodiment of the present application;

[0056] FIG14 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0057] FIG15 is a schematic structural diagram of another battery pack provided in an embodiment of the present application;

[0058] FIG16 is a schematic diagram of the arrangement position of a first buffer member provided in an embodiment of the present application;

[0059] FIG17 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0060] FIG18 is a schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0061] Figure numerals: 1. Battery cell, 11. First top wall, 12. First bottom wall, 13. First side wall, 14. Second side wall, 15. Shell, 16. Covering layer, 161. Window portion, 2. Fixed connector, 21. First connecting portion, 211. First connecting groove, 2111. First bonding structure, 212. Block, 22. Second connecting portion, 221. Second connecting groove, 2211. Second bonding structure, 222. Slot, 23. Slit structure, 24. Hollow structure, 241. Reinforced partition, 25. Third connecting portion, 3. Liquid cooling plate, 4. Box body, 41. Second top wall, 42. Second bottom wall, 43. Third side wall, 51. First buffer, 52. Second buffer, X. First direction, Y. Second direction, Z. Third direction. Specific embodiments

[0062] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

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

[0065] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0066] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0067] An embodiment of the present application provides a battery pack, which is described in detail below with reference to the accompanying drawings.

[0068] 1 to 2 , schematic structural diagrams of two battery packs provided in embodiments of the present application are shown respectively; and FIG. 3 to 13 , schematic structural diagrams of nine fixing connectors provided in embodiments of the present application are shown respectively.

[0069] As shown in Figures 1 and 2, the present application provides a battery pack, comprising a housing 4 and a battery module, the battery module being disposed within the housing 4. The battery module comprises: a plurality of battery cells 1 and a fixed connector 2; the plurality of battery cells 1 are arranged in an array along a first direction X and a second direction Y; the fixed connector 2 comprises a first connecting portion 21 and a second connecting portion 22, the first connecting portion 21 being disposed between and connecting two adjacent battery cells 1 along the first direction X; the first connecting portion 21 being connected to the second connecting portion 22 at at least one end along a third direction Z, the second connecting portion 22 extending in a direction that intersects the direction of extension of the first connecting portion 21, the second connecting portion 22 connecting the battery cells 1 arranged in the first direction X and / or connecting the battery cells 1 arranged in the second direction Y; the first direction X, the second direction Y, and the third direction Z intersecting in pairs. The second connecting portion 22 may extend in a lengthwise direction, and the first connecting portion 21 may extend in a lengthwise direction. Preferably, the extension direction of the second connection portion 22 is perpendicular to the extension direction of the first connection portion 21; preferably, the second connection portion 22 connects all battery cells 1 arranged along the first direction X, or the second connection portion 22 connects all battery cells 1 arranged along the second direction Y.

[0070] In the embodiment of the present application, on the one hand, the first connecting portion 21 is provided. The first connecting portion 21 is disposed between and connects two adjacent battery cells 1, thereby acting as a buffer between adjacent battery cells 1, which helps protect the battery cells 1 and further improves the safety performance of the battery pack. On the other hand, since the first connecting portion 21 is connected to the second connecting portion 22 at at least one end along the third direction Z, and the second connecting portion 22 connects the battery cells 1 arranged along the first direction X and / or connects the battery cells 1 arranged along the second direction Y, that is, the first connecting portion 21 and the second connecting portion 22 are respectively connected to at least a portion of the battery cells 1, thereby connecting multiple battery cells 1 in the battery pack into a whole, which helps further enhance the structural strength of the battery pack and improve the modality and safety of the battery pack.

[0071] It should be noted that the intersecting first direction X, second direction Y and third direction Z can be perpendicular to each other. The material of the fixed connector 2 can be a non-metallic material or a metal material with fireproof and heat-insulating properties, which helps to improve the thermal insulation performance of the battery cell 1 and plays a role in heat insulation when the battery cell 1 has thermal runaway, thereby avoiding heat spread. When the fixed connector 2 is a non-metallic material, such as a plastic material, polyurethane and a multi-fiber composite material, it is light in weight, which is conducive to achieving lightweight battery packs. When the fixed connector 2 is made of metal, the fixed connector 2 has higher strength, which is conducive to improving the overall structural strength of the battery pack. However, it should be noted that in order to avoid the metal fixed connector 2 causing problems such as short circuits in the battery cell 1, it is generally necessary to wrap an insulating layer around the metal fixed connector 2 to improve the safety of the battery pack.

[0072] In practical applications, the battery cell 1 includes a first top wall 11 and a first bottom wall 12 disposed opposite each other along a third direction Z, and side walls located between the first top wall 11 and the first bottom wall 12. The side walls include two first side walls 13 disposed opposite each other along a first direction X, and two second side walls 14 spaced apart along a second direction Y. Each battery cell 1 includes two electrode terminals of opposite polarity to facilitate current transmission. In practical applications, both electrode terminals are typically disposed on the first top wall 11. It is understood that when the second connecting portion 22 is disposed on the first top wall 11, it should avoid the electrode terminals and other components that require clearance. Of course, the two electrode terminals may also be disposed on different walls of the battery cell 1.

[0073] In some embodiments, there is one second connection portion 22 connected to the first connection portion 21, and there are six configurations of the second connection portion 22, namely: (1) the second connection portion 22 is provided at the top of the battery cell 1, and is used to connect the first top walls 11 of two battery cells 1 adjacent to each other along the first direction X; (2) the second connection portion 22 is provided at the top of the battery cell 1, and is used to connect the first top walls 11 of the battery cells 1 arranged along the second direction Y; (3) the second connection portion 22 is provided at the top of the battery cell 1, and is used to connect the first top walls 11 of two battery cells 1 adjacent to each other along the first direction X , and also connects the first top walls 11 of two battery cells 1 adjacent to each other along the second direction Y; (4) the second connecting portion 22 is provided at the bottom of the battery cell 1, and is used to connect the first bottom walls 12 of the battery cells 1 arranged along the first direction X; (5) the second connecting portion 22 is provided at the bottom of the battery cell 1, and is used to connect the first bottom walls 12 of the battery cells 1 arranged along the second direction Y; (6) the second connecting portion 22 is provided at the bottom of the battery cell 1, and is used to connect the first bottom walls 12 of the battery cells 1 arranged along the first direction X, and is also used to connect the first bottom walls 12 of the battery cells 1 arranged along the second direction Y.

[0074] In some other embodiments, there are two second connection portions 22 connected to the first connection portion 21. It is understood that the first connection portion 21 is connected to a second connection portion 22 at both ends along the third direction Z. The two second connection portions 22 are respectively provided at the top and bottom of the battery cell 1. The connection between the two second connection portions 22 and the battery cell 1 is similar to the connection between the two second connection portions 22 and the battery cell 1 as the single second connection portion 22 described above. In addition, the two second connection portions 22 may both extend in the same direction or in intersecting directions. Specifically, the two second connection portions 22 may both extend in the first direction X or the second direction Y, or one of the second connection portions 22 may extend in the first direction X and the other may extend in the second direction Y. It is understood that, compared to providing a single second connection portion 22, providing two second connection portions 22 can respectively fix the first top wall 11 and the first bottom wall 12 of the battery cell 1, which is beneficial for further improving the structural strength of the battery pack.

[0075] It should be noted that the drawings of this application only show the case where one second connection portion 22 is connected to the first top wall 11 of the battery cells 1 arranged along the second direction Y, as shown in FIG1 ; and the case where one second connection portion 22 is connected to the first bottom wall 12 of the battery cells 1 arranged along the first direction X, as shown in FIG2 . In actual applications, those skilled in the art may choose any of the above-mentioned settings according to actual needs, or adopt other settings similar to the above-mentioned settings, which are not limited here. It is understandable that in order to enable the fixed connector 2 to connect more battery cells 1 at the same time to improve the overall structural strength of the battery pack, when the second connection portion 22 is connected to the battery cells 1 arranged along the second direction Y, the second connection portion 22 may also be simultaneously connected to the battery cells 1 arranged along the first direction X, as shown in FIG1 .

[0076] In some optional embodiments of the present application, the battery cell 1 also includes side walls, which include two first side walls 13 arranged opposite to each other along the first direction X and two second side walls 14 arranged opposite to each other along the second direction Y. The area of ​​the second side wall 14 is greater than the area of ​​the first side wall 13, and the second side wall 14 is the wall with the largest area of ​​the battery cell 1; the first connecting portion 21 connects the first side walls 13 of two adjacent battery cells 1 along the first direction X.

[0077] Furthermore, the battery pack further includes a liquid cooling plate 3 , which is disposed between two battery cells 1 adjacent to each other along the second direction Y and connects the two battery cells 1 adjacent to each other along the second direction Y.

[0078] In the embodiment of the present application, the first connecting portion 21 is connected to the first side walls 13 of two adjacent battery cells 1, and correspondingly, the liquid cooling plate 3 is connected to the second side walls 14 of the two adjacent battery cells 1. Since the area of ​​the second side wall 14 is larger than the area of ​​the first side wall 13, the liquid cooling plate 3 can be thermally connected to the larger side wall of the battery cell 1, thereby improving the heat dissipation effect of the battery cell 1, which is beneficial to improving the safety of the battery pack.

[0079] In some embodiments, the second side wall 14 is the wall with the largest surface area in the battery cell 1. The liquid cooling plate 3 is thermally connected to the wall with the largest surface area of ​​the battery cell 1, which can further improve the heat dissipation efficiency of the liquid cooling plate 3 to the battery cell 1, thereby improving the charge and discharge rate and safety of the battery pack.

[0080] It should be noted that those skilled in the art may also set the area of ​​the first side wall 13 to be larger than the area of ​​the second side wall 14 as needed. In this case, since the connection area between the first connecting portion 21 and the battery cell 1 is increased, the connection strength between the battery cell 1 and the fixed connecting member 2 can be further improved, which is beneficial to improving the overall strength of the battery pack. At this time, the liquid cooling plate 3 may also be connected to the first side wall 13, that is, the liquid cooling plate 3 is arranged between two adjacent battery cells 1 along the first direction X. At this time, the first connecting portion 21 and the liquid cooling plate 3 may be alternately arranged along the first direction X. At this time, there are at least three battery cells 1 along the first direction, or the liquid cooling plate 3 and the first connecting portion 21 may be distributed along the third direction Z and located between two adjacent battery cells 1 in the same group.

[0081] In some embodiments, the liquid cooling plate 3 is arranged between two adjacent battery cells 1 along the second direction Y, and the liquid cooling plate 3 is connected to the second connecting portion 22. Specifically, the liquid cooling plate 3 and the second connecting portion 22 can be bonded together, so that the battery cell 1, the liquid cooling plate 3 and the fixed connecting member 2 can be connected into a whole, further improving the modality of the battery pack.

[0082] In some optional embodiments of the present application, the second connection portion 22 extends along the first direction X and / or the second direction Y. Specifically, when the second connection portion 22 is provided at one end of the first connection portion 21, the second connection portion 22 may extend along the first direction X or along the second direction Y. When the second connection portion 22 is provided at both ends of the first connection portion 21, one second connection portion 22 may extend along the first direction X and the other second connection portion 22 may extend along the second direction Y. A plurality of first connection portions 21 are provided, and the plurality of first connection portions 21 are spaced apart and connected to the second connection portion 22 along the extension direction of the second connection portion 22. At least one first connection portion 21 is provided between two adjacent battery cells 1 along the first direction X.

[0083] In the embodiment of the present application, since there are multiple first connection parts 21, the multiple first connection parts 21 are arranged at intervals along the extension direction of the second connection part 22, so that the fixed connection part 2 has scalability, so that more battery cells 1 can be fixedly connected, which is beneficial to improving the modality of the battery pack.

[0084] It should be noted that in some embodiments, the multiple first connection portions 21 are formed by machining multiple slit structures 23 on a single plate, while in other embodiments, each first connection portion 21 is a separate component, as shown in Figures 7 to 13. The embodiments of this application do not limit the machining method of the first connection portion 21, and those skilled in the art may select a method based on actual needs.

[0085] In some embodiments, to improve the heat dissipation of the battery pack, the liquid cooling plate 3 extends along a first direction X and is disposed between the second side walls 14 of two adjacent battery cells 1 along a second direction Y. Based on this, in some embodiments, the second connecting portion 22 extends along the first direction. In this case, the extension direction of the liquid cooling plate 3 is parallel to the extension direction of the second connecting portion 22. In other embodiments, the second connecting portion 22 extends along the second direction. In this case, the extension direction of the liquid cooling plate 3 intersects with the extension direction of the second connecting portion 22. In this case, since the liquid cooling plate 3 also connects to adjacent battery cells 1, corresponding components are connected around each battery cell 1, thereby further improving the modality of the battery pack. The embodiments of the present application do not specifically limit the extension direction of the liquid cooling plate 3 and the second connecting portion 22, and those skilled in the art can adjust them according to actual needs.

[0086] In some optional embodiments of the present application, the liquid cooling plate 3 extends along the first direction X and is arranged between two adjacent battery cells 1 along the second direction Y; the second connecting portion 22 extends along the second direction Y, and a slit structure 23 is formed between two adjacent first connecting portions 21; the liquid cooling plate 3 is passed through the slit structure 23.

[0087] In the embodiment of the present application, as shown in Figures 3 to 6, when the second connecting portion 22 is extended along the second direction Y, a slit structure 23 is formed between two adjacent first connecting portions 21. By passing the liquid cooling plate 3 through the slit structure 23, interference between the liquid cooling plate 3 and the fixed connecting member 2 can be avoided. At this time, the liquid cooling plate 3 and the first connecting portion 21 connect the surrounding adjacent battery cells 1, so that the battery cells 1, the liquid cooling plate 3 and the fixed connecting member 2 form a whole, further improving the modality of the battery pack.

[0088] It should be noted that the slit structure 23 may refer to a structure that is adapted to the outer shape of the liquid cooling plate 3 and is used for the liquid cooling plate 3 to pass through. In some embodiments, the slit structure 23 is a closed slit structure 23 processed on a plate, as shown in Figure 3. During the battery pack assembly process, the liquid cooling plate 3 must first be installed to the slit structure 23 of the fixed connector 2, and then each battery cell 1 must be connected to the fixed connector 2 and the liquid cooling plate 3 respectively to facilitate the positioning and installation of the battery cell 1. It is understandable that in order to facilitate the insertion of the liquid cooling plate 3 into the slit structure 23, generally, the outer dimensions of the closed slit structure 23 need to be larger than the outer dimensions of the liquid cooling plate 3. In other embodiments, as shown in Figures 4 to 6, the slit structure 23 is an unclosed slit structure 23 enclosed by a plurality of spaced first connecting portions 21, or an unclosed slit structure 23 machined on a plate. The fixed connector 2 also includes a third connecting portion 25, and the ends of two adjacent first connecting portions 21 away from the second connecting portion 22 are connected by the third connecting portion 25 to close the unclosed slit structure 23. During the battery pack assembly process, the liquid cooling plate 3 can be first installed to the slit structure 23 of the fixed connector 2, and then each battery cell 1 can be connected to the fixed connector 2 and the liquid cooling plate 3 respectively; or the fixed connector 2 can be first connected to each battery cell 1, and then the liquid cooling plate 3 can be installed from the unclosed portion to the slit structure, making the battery pack installation more flexible.

[0089] In some embodiments, the average size of the slit structure 23 along the second direction Y is D1 mm, and the average thickness of the liquid cooling plate 3 is D2 mm, satisfying: 1≤D1 / D2≤5. In this case, it can be ensured that the size of the slit structure 23 in the second direction Y is slightly larger than the thickness of the liquid cooling plate 3, so that the slit structure 23 can absorb the tolerance in the second direction Y as much as possible, thereby ensuring that the liquid cooling plate 3 is inserted into the slit structure 23. The average thickness of the liquid cooling plate 3 is measured as follows:

[0090] (1) When the liquid cooling plate 3 is a flat plate, the two outer wall surfaces of the liquid cooling plate 3 along the second direction Y are used as references, and the thickness at multiple different positions is measured multiple times using a vernier caliper and the average value is calculated to obtain the average thickness;

[0091] (2) When the liquid cooling plate 3 is an S-shaped plate, use a vernier caliper to measure the thickness at different positions multiple times and calculate the average value to obtain the average thickness;

[0092] (3) When the liquid cooling plate 3 is a W-shaped plate, the distance between the opposite outer wall surfaces is measured multiple times using a vernier caliper, and the average value is calculated to obtain the average thickness.

[0093] Battery pack Z-direction first-order modal test method:

[0094] Fix the battery pack on the test bench and arrange acceleration and amplitude sensors. In a 25°C environment, use an acceleration of 0.5g and perform a sinusoidal frequency sweep of 5 to 250Hz in the Z direction of the battery pack at a sweep rate of 1.0 (oct / min). The frequency at which the battery pack produces maximum amplitude is recorded as the battery pack's mode.

[0095] According to the following test example, the Z-direction first-order mode of the battery pack is tested when the D1 / D2 values ​​are different:

[0096] According to the above tests, when 1≤D1 / D2≤5, the battery pack has a good modal state, indicating that the battery pack has good vibration resistance, thereby enabling the battery pack to maintain reliable fixation of the battery cells 1 under complex operating conditions, avoiding collisions between the battery cells 1, and improving the service life and safety of the battery pack. When the value of D1 / D2 is less than 1, the liquid cooling plate 3 cannot be inserted into the slit structure 23, and assembly interference occurs between the liquid cooling plate 3 and the fixed connector 2, making the battery pack unable to be assembled. When the value of D1 / D2 is greater than 5, the battery pack has a small modal state.

[0097] In some optional embodiments of the present application, the first connecting portion 21 and the second connecting portion 22 are respectively bonded to at least a portion of the battery cell 1. Thus, by providing bonding structures between the first connecting portion 21 and the battery cell 1 and between the second connecting portion 22 and the battery cell 1, the fixed connector 2 and the battery cell 1 can be reliably connected together, forming a modular effect, thereby improving the overall structural strength of the battery pack.

[0098] In some optional embodiments of the present application, as shown in Figures 3 to 5, 7 to 9, and 13, a first connection groove 211 is provided on at least one side of the first connection portion 21 along the first direction X. The first connection groove 211 is filled with a first adhesive structure 2111, which connects the first connection portion 21 to the battery cell 1. A second connection groove 221 is provided on a side of the second connection portion 22 adjacent to the battery cell 1. The second connection groove 221 is filled with a second adhesive structure 2211, which connects the second connection portion 22 to the battery cell 1.

[0099] In the embodiment of the present application, the first connecting groove 211 and the second connecting groove 221 are provided, and the first connecting groove 211 and the second connecting groove 221 are filled with a first adhesive structure 2111 and a second adhesive structure 2211, respectively. The first adhesive structure 2111 and the second adhesive structure 2211 can be an adhesive. Thus, by providing the first connecting groove 211 and the second connecting groove 221, the bonding position and the amount of adhesive filled can be effectively controlled, thereby increasing the bonding area while effectively controlling the thickness of the adhesive layer. This ensures that the first connecting portion 21 and the second connecting portion 22 are reliably bonded to the battery cell 1, thereby saving adhesive and reducing the assembly cost of the battery pack.

[0100] It should be noted that the adhesives in the embodiments of the present application include but are not limited to potting glue, foam glue, or structural glue. The embodiments of the present application do not limit the type of adhesive, and those skilled in the art can choose according to needs.

[0101] In practical applications, since the first connecting portion 21 is positioned between two adjacent battery cells 1, in one embodiment, a first connecting groove 211 is provided on each side of the first connecting portion 21 along the first direction X, as shown in FIG3 . During assembly of the battery pack, adhesive can be first filled into the first connecting groove 211, and then the battery cells 1 are bonded to the first connecting portion 21. In another embodiment, the first connecting portion 21 is provided with a first connecting groove 211 extending through the first connecting portion 21, as shown in FIG8 and FIG9 . During assembly of the battery pack, the first connecting portion 21 can be first placed corresponding to one of the battery cells, adhesive can be injected into the first connecting groove 211, and finally, the other battery cell 1 can be connected to the first connecting portion 21. In addition, in one embodiment, the second connecting portion 22 is provided with a second connecting groove 221 extending along the second direction Y, as shown in FIG4 and FIG5 . In another embodiment, the second connecting portion 22 is provided with second connecting grooves 221 spaced apart along the first direction X or the second direction Y, as shown in FIG3 and FIG7 through FIG9 . The embodiment of the present application does not limit the specific structures of the first connecting groove 211 and the second connecting groove 221 , and those skilled in the art can adjust them as needed.

[0102] In some optional embodiments of the present application, as shown in Figures 17 and 18, the battery cell 1 includes a shell 15 and a covering layer 16 covering the shell 15; the covering layer 16 is provided with a window portion 161 at a position corresponding to the first connecting portion 21 and / or the second connecting portion 22 to expose the shell 15; the first connecting portion 21 and / or the second connecting portion 22 are connected to the shell 15 at the position corresponding to the window portion 161.

[0103] In the embodiment of the present application, the battery cell 1 has window portions 161 provided on the covering layer 16 at positions corresponding to the first and second connecting portions 21, 22. This allows the housing 15 of the battery cell 1 to be exposed, allowing the first and second connecting portions 21, 22 to be directly connected to the housing 15. This further enhances the connection strength between the first and second connecting portions 21, 22, and the housing 15, thereby improving the structural strength of the battery pack. It should be noted that the battery cell 1 has window portions 161 provided at positions corresponding to the first and second connecting portions 21, 22. Specifically, the battery cell 1 has window portions 161 provided at positions corresponding to the first and second connecting grooves 211, 221, so that the first and second connecting portions 21, 22 can be directly connected to the housing 15.

[0104] In some optional embodiments of the present application, as shown in FIG16 , the battery pack further includes a first buffer member 51 ; a first buffer member 51 is provided between the first connecting portion 21 and the adjacent battery cell 1 and between the second connecting portion 22 and the battery cell 1 .

[0105] In the embodiment of the present application, since first buffer members 51 are respectively provided between the first connection portion 21 and the battery cell 1 and between the second connection portion 22 and the battery cell 1, assembly tolerances can be absorbed, effectively improving the assembly feasibility of the fixed connection member 2 and the battery cell 1.

[0106] It should be noted that a first buffer member 51 is also provided between the first connecting portion 21 and the battery cell 1, and between the second connecting portion 22 and the battery cell 1. The first buffer member 51 includes, but is not limited to, foam, rubber strips, or other elastically deformable materials, and is not limited here. Persons skilled in the art may select materials as needed. In one embodiment, the first buffer member is provided around the first connecting groove 211 and the second connecting groove 221. This not only absorbs assembly tolerances between the fixed connecting member 2 and the battery cell 1, but also prevents overflow of the adhesive filling the first connecting groove 211 and the second connecting groove 221 during assembly.

[0107] As shown in Figures 12 and 13, the first connecting portion 21 is detachably connected to the second connecting portion 22. Furthermore, one of a block 212 or a slot 222 is provided on one end of the first connecting portion 21 near the second connecting portion 22, and the other of the block 212 or the slot 222 is provided on one side of the second connecting portion 22 near the first connecting portion 21. The block 212 and the slot 222 are engaged with each other.

[0108] In the embodiment of the present application, the first connecting portion 21 and the second connecting portion 22 are detachably connected, which facilitates the assembly and disassembly of the fixed connector 2 and the replacement of individual components. Specifically, the first connecting portion 21 is provided with one of the clamping block 212 or the clamping slot 222, and the second connecting portion 22 is provided with the other of the clamping block 212 or the clamping slot 222. The first connecting portion 21 and the second connecting portion 22 are securely connected by the mutual engagement of the clamping block 212 and the clamping slot 222.

[0109] It should be noted that the drawings of this application only illustrate the case where the first connection portion 21 is provided with the block 212, and the second connection portion 22 is correspondingly provided with the slot 222. In actual applications, the slot 222 may also be provided on the first connection portion 21, and the block 212 may be provided on the second connection portion 22, and the first connection portion 21 and the second connection portion 22 may be connected by the engagement of the slot 222 and the block 212.

[0110] In other embodiments, the first connection portion 21 and the second connection portion 22 may be integrally connected to reduce manufacturing steps and lower costs.

[0111] In other embodiments, the first connection portion 21 and the second connection portion 22 may be fixed by welding, and welding can improve the connection reliability between the two.

[0112] As shown in Figures 3 to 4 and Figures 10 to 11, at least one of the first connecting part 21 and the second connecting part 22 is provided with a hollow structure 24, and a reinforcing partition 241 is provided in the hollow structure 24. The reinforcing partition 241 can be extended along the third direction Z to connect the two inner walls of the hollow structure 24 in the third direction Z.

[0113] In the embodiment of the present application, since the first connecting portion 21 and the second connecting portion 22 are provided with a hollow structure 24, the weight of the fixed connecting member 2 can be reduced, which is beneficial to achieving a lightweight battery pack. Since a reinforcing partition 241 is provided in the hollow structure 24, the strength of the fixed connecting member 2 can be improved, which is beneficial to improving the overall structural strength of the battery pack. It should be noted that the drawings of this application do not show the situation where the reinforcing partition 241 is provided in the first connecting portion 21. In actual applications, those skilled in the art can provide a reinforcing partition 241 in the first connecting portion 21 having a hollow structure 24 to improve the structural strength of the first connecting portion 21.

[0114] In practice, the first and second connecting portions 21 and 22 are each provided with a through-hole extending in their respective directions to form a hollow structure 24. A reinforcing baffle 241 is disposed within the through-hole, and its extension direction aligns with that of the through-hole. Multiple reinforcing baffles 241 may be provided, spaced apart perpendicularly to the direction in which the through-holes extend, to further enhance the structural strength of the first and second connecting portions 21 and 22.

[0115] In summary, the battery pack provided by the embodiments of the present application has at least the following advantages:

[0116] In an embodiment of the present application, a battery pack includes: a plurality of battery cells and a fixed connector; the plurality of battery cells are arrayed along a first direction and a second direction; the fixed connector includes a first connector and a second connector, the first connector being disposed between and connecting two adjacent battery cells along the first direction; the second connector being connected to at least one end of the first connector along a third direction, the second connector extending in a direction intersecting with the first connector extending in a direction intersecting with the first connector, the second connector connecting the battery cells arranged in the first direction, and / or the second connector connecting the battery cells arranged in the second direction; and the first, second, and third directions intersecting in pairs. Thus, on the one hand, due to the provision of the first connector, which is disposed between and connecting two adjacent battery cells, collision or friction between adjacent battery cells can be effectively avoided, thereby facilitating protection of the battery cells and further improving the safety performance of the battery pack. On the other hand, since the first connecting portion is connected to the second connecting portion at at least one end along the third direction, and the second connecting portion is connected to the battery cells arranged along the first direction, and / or the second connecting portion is connected to the battery cells arranged along the second direction, that is, the first connecting portion and the second connecting portion are respectively connected to at least part of the battery cells, the multiple battery cells in the battery pack can be connected into a whole, which is beneficial to further enhance the structural strength and modality of the battery pack.

[0117] Referring to Figures 14 and 15 , schematic diagrams of the structures of two battery packs provided in embodiments of the present application are shown. As shown in Figures 14 and 15 , the housing 4 includes a second top wall 41 and a second bottom wall 42 arranged along a third direction Z. The battery module is disposed between the second top wall 41 and the second bottom wall 42, and the second connecting portion 22 is connected to the second top wall 41 or the second bottom wall 42 on the side facing away from the first connecting portion 21. This connection between the second connecting portion 22 and the second top wall 41 or the second bottom wall 42 secures the battery module within the housing 4 of the battery pack, thereby improving the overall structural strength of the battery pack.

[0118] In some optional embodiments of the present application, the box body 4 also includes a third side wall 43 arranged between the second top wall 41 and the second bottom wall 42; as shown in Figure 14, the battery pack also includes a second buffer 52, and the second buffer 52 is arranged between the third side wall 43 and the battery module.

[0119] In this embodiment of the present application, a second buffer member 52 is provided between the third side wall 43 of the housing 4 and the battery module. This second buffer member 52 can fill the gap between the battery module and the housing 4, thereby further enhancing the structural strength of the battery pack. It should be noted that the second buffer member 52 is provided between the third side wall 43 of the housing 4 and the battery module. The second buffer member may include, but is not limited to, foam, foamed plastic, or other materials, and those skilled in the art may select the material as needed.

[0120] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0121] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, wherein: It comprises a box body (4) and a battery module arranged in the box body (4), wherein the battery module comprises a plurality of battery cells (1) and a fixed connection member (2); The plurality of battery cells (1) are distributed in an array along a first direction (X) and a second direction (Y); The fixed connection member (2) comprises a first connection portion (21) and a second connection portion (22), wherein the first connection portion (21) is arranged between two battery cells (1) adjacent to each other along the first direction (X) and connects the two battery cells (1) adjacent to each other along the first direction (X); at least one end of the first connection portion (21) along the third direction (Z) is connected to the second connection portion (22), the extension direction of the second connection portion (22) intersects the extension direction of the first connection portion (21), and the second connection portion (22) connects the battery cells (1) arranged along the first direction (X); The first direction (X), the second direction (Y), and the third direction (Z) intersect with each other.

2. The battery pack according to claim 1, wherein: The second connecting portion (22) connects the battery cells (1) arranged along the second direction (Y).

3. The battery pack according to claim 1 or 2, wherein: The battery cell (1) comprises two first side walls (13) arranged opposite to each other along the first direction (X) and two second side walls (14) arranged opposite to each other along the second direction (Y), the area of ​​the second side walls (14) being greater than the area of ​​the first side walls (13), and the second side walls (14) being the wall with the largest area of ​​the battery cell (1); The first connecting portion (21) connects the first side walls (13) of two adjacent battery cells (1) along the first direction (X).

4. The battery pack according to claim 1 or 2, wherein: The battery pack further comprises a liquid cooling plate (3); along the first direction (X), there are at least three battery cells (1); the liquid cooling plate (3) is arranged between two adjacent battery cells (1) along the first direction (X) and connects the two adjacent battery cells (1) along the first direction (X); the liquid cooling plate (3) and the first connecting portion (21) are alternately arranged along the first direction (X).

5. The battery pack according to claim 1 or 2, wherein: The battery pack further comprises a liquid cooling plate (3); along the first direction (X), there are at least three battery cells (1); the liquid cooling plate (3) is arranged between two battery cells (1) adjacent to each other along the first direction (X) and connects the two battery cells (1) adjacent to each other along the first direction (X); the liquid cooling plate (3) and the first connecting portion (21) are arranged at intervals along the third direction (Z).

6. The battery pack according to claim 1 or 2, wherein: The second connecting portion (22) extends along the first direction (X); A plurality of the first connecting portions (21) are provided, and the plurality of the first connecting portions (21) are arranged at intervals along the extension direction of the second connecting portion (22) and connected to the second connecting portion (22), and at least one first connecting portion (21) is provided between two adjacent battery cells (1) along the first direction (X).

7. The battery pack according to claim 1 or 2, wherein: The second connecting portion (22) extends along the second direction (Y); A plurality of the first connecting portions (21) are provided, and the plurality of the first connecting portions (21) are arranged at intervals along the extension direction of the second connecting portion (22) and connected to the second connecting portion (22), and at least one first connecting portion (21) is provided between two adjacent battery cells (1) along the first direction (X).

8. The battery pack according to claim 6, wherein: The battery pack further comprises a liquid cooling plate (3), the liquid cooling plate (3) extending along the first direction (X) and arranged between two adjacent battery cells (1) along the second direction (Y); The second connecting portion (22) extends along the second direction (Y), and a slit structure (23) is formed between two adjacent first connecting portions (21); The liquid cooling plate (3) is arranged through the slit structure (23).

9. The battery pack according to claim 8, wherein: The average size of the slit structure (23) along the second direction (Y) is D1 mm, and the average thickness of the liquid cooling plate (3) is D2 mm, satisfying the following: 1≤D1 / D2≤5.

10. The battery pack according to claim 8, wherein: The fixed connection member (2) further comprises a third connection portion (25), and two adjacent first connection portions (21) are connected at one end away from the second connection portion (22) via the third connection portion (25).

11. The battery pack according to claim 1 or 2, wherein: The first connecting portion (21) and the second connecting portion (22) are respectively bonded to at least a portion of the battery cell (1).

12. The battery pack according to claim 11, wherein: The first connecting portion (21) is provided with a first connecting groove (211) on at least one side along the first direction (X), the first connecting groove (211) is filled with a first adhesive structure (2111), and the first adhesive structure (2111) connects the first connecting portion (21) and the battery cell (1).

13. The battery pack according to claim 11, wherein: A second connection groove (221) is provided on a side of the second connection portion (22) close to the battery cell (1); the second connection groove (221) is filled with a second adhesive structure (2211); and the second adhesive structure (2211) connects the second connection portion (22) and the battery cell (1).

14. The battery pack according to claim 1 or 2, wherein: The first connecting portion (21) and the second connecting portion (22) are integrally connected.

15. The battery pack according to claim 1 or 2, wherein: One of the clamping block (212) and the clamping slot (222) is provided at one end of the first connecting portion (21) close to the second connecting portion (22), and the other of the clamping block (212) and the clamping slot (222) is provided at one side of the second connecting portion (22) close to the first connecting portion (21), and the clamping block (212) and the clamping slot (222) are engaged with each other.

16. The battery pack according to claim 1 or 2, wherein: At least one of the first connecting portion (21) and the second connecting portion (22) is provided with a hollow structure (24), and a reinforcing partition (241) is provided in the hollow structure (24).

17. The battery pack according to claim 1 or 2, wherein: The battery pack further includes a first buffer member (51); The first buffer member (51) is respectively provided between the first connecting portion (21) and the adjacent battery cell (1), and between the second connecting portion (22) and the battery cell (1).

18. The battery pack according to claim 1 or 2, wherein: The battery cell (1) comprises a shell (15) and a coating layer (16) coating the shell (15); The coating layer (16) is provided with a window portion (161) to expose the shell (15); The first connecting portion (21) and / or the second connecting portion (22) are connected to the housing (15) at a position corresponding to the window portion (161).

19. The battery pack according to claim 1 or 2, wherein: The box body (4) comprises a second top wall (41) and a second bottom wall (42) arranged along the third direction (Z); the battery module is arranged between the second top wall (41) and the second bottom wall (42), and the side of the second connecting portion (22) facing away from the first connecting portion (21) is connected to the second top wall (41) or the second bottom wall (42).

20. The battery pack according to claim 16, wherein: The box body (4) further includes a third side wall (43) arranged between the second top wall (41) and the second bottom wall (42); The battery pack further includes a second buffer member (52), which is arranged between the third side wall (43) and the battery module.

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