A battery module, a battery pack and an electric device

Abstract

The application discloses a battery module, a battery pack and a power utilization device, relates to the technical field of vehicles, and aims to solve the problem of how to improve the convenience of assembly between battery modules. The battery module comprises a first end plate, a second end plate and a plurality of battery cells, the plurality of battery cells are arranged between the first end plate and the second end plate; the first end plate is provided with a first recess and a first protrusion, the second end plate is provided with a second recess and a second protrusion, along the arrangement direction of the first end plate and the second end plate, the first recess corresponds to the second protrusion, and the first protrusion corresponds to the second recess. The first recess of one battery module is connected with the second protrusion of another battery module, and the first protrusion of one battery module is connected with the second recess of another battery module.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a battery module, battery pack, and electrical equipment. Background Technology

[0002] A battery pack is an energy supply device for electrical equipment. A battery pack typically consists of multiple battery modules connected together, and each battery module contains multiple battery cells. Multiple battery cells are usually fixed together by a frame.

[0003] In the existing technology, the fixing frame of the battery module is mostly connected by welding. During the connection process of the battery modules in the battery pack, adjacent battery modules generally also need to be connected by welding, which is inconvenient. Utility Model Content

[0004] The purpose of this application is to provide a battery module, battery pack, and electrical device, which aims to solve the problem of how to improve the ease of assembly between battery modules.

[0005] In a first aspect, a battery module is provided, including a first end plate, a second end plate, and a plurality of battery cells, wherein the plurality of battery cells are disposed between the first end plate and the second end plate; the first end plate is provided with a first recess and a first protrusion, and the second end plate is provided with a second recess and a second protrusion, wherein along the arrangement direction of the first end plate and the second end plate, the first recess corresponds to the second protrusion, and the first protrusion corresponds to the second recess.

[0006] The first recess of one battery module is connected to the second protrusion of another battery module, and the second recess of one battery module is connected to the first protrusion of another battery module.

[0007] In the above scheme, the first end plate has a first recess and a first protrusion, and the second end plate has a second recess and a second protrusion. Along the arrangement direction of the first and second end plates, the first recess of the first end plate corresponds to the second protrusion of the second end plate, and the first protrusion of the first end plate corresponds to the second recess of the second end plate. When the first battery module is connected to the second battery module, the first and second battery modules are placed in opposite directions along the arrangement direction of the first and second end plates, that is, the first end plate of the first battery module corresponds to and is connected to the second end plate of the second battery module, and the second end plate of the first battery module corresponds to and is connected to the first end plate of the second battery module. The connection is achieved through the first recess of one battery module and the second protrusion of the other battery module, and through the first protrusion of the first battery module and the second recess of the other battery module. This realizes the connection between the first and second battery modules, with a simple connection structure, easy operation, and improved convenience of connecting adjacent battery modules in the battery pack.

[0008] Optionally, the battery module includes a first side and a second side opposite to each other, the arrangement direction of the first side and the second side being perpendicular to the arrangement direction of the first end plate and the second end plate; the first end plate has a first surface facing the first side, the first protrusion being disposed on the first surface, and the first recess being recessed from the first surface toward the second side; the second end plate has a second surface facing the first side, the second protrusion being disposed on the second surface, and the second recess being recessed from the second surface toward the second side.

[0009] Optionally, the first end plate is provided with a first connecting hole, which extends from the inner wall surface of the first recess toward the second side to the second side.

[0010] The second end plate is provided with a second connection hole, which extends from the surface of the second protrusion facing away from the second side toward the second side.

[0011] The first connection hole is used to connect to the second connection hole of the adjacent battery module.

[0012] Optionally, the first end plate is provided with a third connecting hole, which extends from the surface of the first protrusion facing away from the second side toward the second side.

[0013] The second end plate is provided with a fourth connection hole, which extends from the inner wall surface of the second recess toward the second side to the second side; the fourth connection hole is used to connect with the third connection hole of the other adjacent battery module.

[0014] Optionally, the battery module further includes a connector, which is connected between the first end plate and the second end plate.

[0015] Optionally, the connector is detachably connected to the first end plate; and / or, the connector is detachably connected to the second end plate.

[0016] Optionally, all of the battery cells are connected to the connector.

[0017] Optionally, the battery module further includes an adhesive component disposed between the plurality of battery cells and the connector.

[0018] Optionally, the battery module includes a first side and a second side opposite to each other, the arrangement direction of the first side and the second side being perpendicular to the arrangement direction of the first end plate and the second end plate; the connector is located on the first side.

[0019] Optionally, the number of connectors is multiple, and the multiple connectors are arranged along a first direction, which is perpendicular to the arrangement direction of the first side and the second side, and also perpendicular to the arrangement direction of the first end plate and the second end plate.

[0020] Optionally, the connector includes a connecting portion and a reinforcing portion, the connecting portion being connected to a plurality of the battery cells, and the reinforcing portion being connected to the side of the connecting portion opposite to the plurality of battery cells.

[0021] Optionally, the connecting part includes a connecting plate, and the reinforcing part includes a reinforcing plate.

[0022] Optionally, along the first direction, the width of the connecting plate is greater than the width of the reinforcing plate; and / or, along the arrangement direction of the connecting plate and the reinforcing plate, the thickness of the reinforcing plate is greater than the thickness of the connecting plate.

[0023] Optionally, the battery module further includes a heat insulation component disposed on the side of the plurality of battery cells facing the connector.

[0024] Optionally, the heat insulation element is disposed on the side of the connector opposite to the plurality of battery cells.

[0025] Optionally, the battery module further includes a support member, which is disposed on the side of the plurality of battery cells facing away from the connector, and the first end plate and the second end plate are both connected to the support member.

[0026] Optionally, the support member includes a support plate.

[0027] Optionally, the support member further includes a first connecting piece, which is connected to the support plate and located on the side of the first end plate opposite to the second end plate, and the first connecting piece is detachably connected to the first end plate; and / or, the support member further includes a second connecting piece, which is connected to the support plate and located on the side of the second end plate opposite to the first end plate, and the second connecting piece is detachably connected to the second end plate.

[0028] Optionally, the battery module further includes a heating element disposed between the support member and the plurality of battery cells.

[0029] Optionally, the heating element includes a heating plate.

[0030] Secondly, a battery pack is provided, including a battery module.

[0031] Optionally, the battery pack includes a plurality of battery modules, wherein the first end plate of one of two adjacent battery modules is opposite to and connected to the second end plate of the other battery module.

[0032] Optionally, the plurality of battery modules includes a first battery module, a second battery module, and a third battery module, with the second battery module connected between the first battery module and the third battery module. A first recessed portion of the first battery module is connected to a second protruding portion of the second battery module, and a second recessed portion of the second battery module is connected to the first protruding portion of the third battery module. A second recessed portion of the first battery module is connected to a first protruding portion of the second battery module, and a first recessed portion of the second battery module is connected to a second protruding portion of the third battery module.

[0033] Thirdly, an electrical device is provided, including a battery module; or including a battery pack.

[0034] It should be noted that the technical effects of the implementation methods of the second and third aspects of this application can be found in the technical effects of the corresponding implementation methods in the first aspect, and will not be repeated here. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0038] Figure 3 for Figure 2 Exploded view of the battery module;

[0039] Figure 4 A schematic diagram of the connection state between the first end plate and the second end plate provided in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the structure of a connector provided in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of a structure for connecting multiple battery modules, provided in an embodiment of this application.

[0042] Figure label:

[0043] 100. Vehicles;

[0044] 10. Vehicle body;

[0045] 20. Battery module; 20a. First battery module; 20b. Second battery module; 20c. Third battery module;

[0046] 1. First end plate; 11. First protrusion; 12. First recess; 13. First surface; 14. First connecting hole; 15. Third connecting hole;

[0047] 2. Second end plate; 21. Second protrusion; 22. Second recess; 23. Second surface; 24. Second connecting hole;

[0048] 3. Battery cells;

[0049] 4. Bolts;

[0050] 5. Connecting parts; 51. Connecting portion; 52. Reinforcing portion; 53. Threaded hole;

[0051] 6. Thermal insulation components;

[0052] 7. Support component; 71. First connecting piece;

[0053] 8. Heating element. Detailed Implementation

[0054] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0055] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0056] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0057] In the embodiments of this application, "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, said acceptable deviation range being determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0058] A battery pack is generally a power supply device composed of one or more battery modules 20. It supplies power to electrical devices to ensure their normal operation. When a battery pack is composed of multiple battery modules 20 connected together, a stable connection structure is required between the multiple battery modules 20 to ensure that the battery pack has sufficient strength and prevents damage during transportation and installation. For ease of understanding, in this embodiment, three adjacent battery modules 20 among the connected battery modules 20 are respectively named the first battery module 20a, the second battery module 20b, and the third battery module 20c.

[0059] In some examples, the battery module 20 is formed by fixing multiple battery cells 3 with a fixed frame. The multiple battery cells 3 can be electrically connected in series or in parallel to form the battery module 20.

[0060] The electrical equipment can be a vehicle 100, a ship, an airplane, or other transportation vehicle, or it can be hoisting equipment, refrigeration equipment, etc. For ease of understanding, this application uses the application of a battery pack in a vehicle 100 as an example. See reference. Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in an embodiment of this application. It should be understood that the vehicle 100 can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, a range-extended electric vehicle, a gasoline vehicle, etc. The vehicle 100 can also be a sedan, a plug-in vehicle, a truck, a bus, a lorry, a trailer, etc. This application does not specifically limit the type of vehicle 100.

[0061] The vehicle 100 includes a body 10 and related equipment such as a refrigerator, television, and motor connected to the body 10. A battery pack or battery module 20 is connected to the body 10 to supply power to the refrigerator, television, motor, etc., to ensure the normal operation of the related equipment in the vehicle 100.

[0062] In some implementations, see Figure 2 and Figure 3 Multiple battery cells 3 are fixed together by a fixed frame to form a stable connection, thereby assembling a battery module 20. The battery module 20 includes a first end plate 1, a second end plate 2, and multiple battery cells 3, all disposed between the first end plate 1 and the second end plate 2. The first end plate 1 has a first recess 12 and a first protrusion 11, and the second end plate 2 has a second recess 22 and a second protrusion 21. Along the arrangement direction of the first end plate 1 and the second end plate 2, the first recess 12 corresponds to the second protrusion 21, and the first protrusion 11 corresponds to the second recess 22.

[0063] When two or more battery modules 20 are connected, the first recess 12 of one battery module 20 is connected to the second protrusion 21 of another battery module 20, and the second recess 22 of one battery module is connected to the first protrusion 11 of another battery module.

[0064] In the above scheme, the first end plate 1 is provided with a first recess 12 and a first protrusion 11, and the second end plate 2 is provided with a second recess 22 and a second protrusion 21. Along the arrangement direction of the first end plate 1 and the second end plate 2, the first recess 12 of the first end plate 1 and the second protrusion 21 of the second end plate 2 correspond to each other, and the first protrusion 11 of the first end plate 1 corresponds to the second recess 22 of the second end plate 2. When the first battery module 20a is connected to the second battery module 20b, the first battery module 20a and the second battery module 20b are placed in opposite directions along the arrangement direction of the first end plate 1 and the second end plate 2. That is, the first end plate 1 of the first battery module 20a and the second end plate 2 of the second battery module 20b correspond to and are connected, and the second end plate 2 of the first battery module 20a corresponds to and is connected to the first end plate 1 of the second battery module 20b. They are connected through the first recess 12 of one battery module 20 and the second protrusion 21 of the other battery module 20, and the second recess (22) of one battery module and the first protrusion (11) of the other battery module are connected. This realizes the connection between the first battery module 20a and the second battery module 20b. The connection structure is simple, easy to operate, and improves the convenience of connecting two adjacent battery modules 20 in the battery pack.

[0065] In addition, the modular design of the first end plate 1 and the second end plate 2 allows for mass production or stockpiling, thereby improving the production and assembly efficiency of the battery pack.

[0066] In some examples, in two adjacent battery modules 20, the connection between the first recess 12 and the second protrusion 21 can be as follows: the first recess 12 has a first through hole along its recessed direction to accommodate the second protrusion 21. The second protrusion 21 passes through the first through hole from the side of the first end plate 1 opposite to the first recess 12, with a portion of the second protrusion 21 extending into the first recess 12. The portion of the second protrusion 21 placed within the first recess 12 has a pin hole, and a pin is installed in the pin hole. The pin engages with the inner wall surface of the first recess 12 to lock and limit the second protrusion 21, thereby achieving the connection between the first recess 12 and the second protrusion 21.

[0067] In some implementations, see Figure 2The battery module 20 includes a first side and a second side facing each other, the arrangement direction of the first side and the second side being perpendicular to the arrangement direction of the first end plate 1 and the second end plate 2. The first end plate 1 has a first surface 13 facing the first side, and a first recess 12 is provided on the first surface 13; the second end plate 2 has a second surface 23 facing the first side, and a second recess 22 is provided on the second surface 23. The first end plate 1 is provided with a first connecting hole 14, which extends from the inner wall surface of the first recess 12 towards the second side to the second side; the second end plate 2 is provided with a second connecting hole 24, which extends from the surface of the second protrusion 21 facing away from the second side towards the second side. The first connecting hole 14 is used to connect with the second connecting hole 24 of an adjacent battery module 20.

[0068] In the above scheme, when adjacent first battery module 20a and second battery module 20b are connected, one end of the first battery module 20a and the second battery module 20b are connected through the first end plate 1 of the first battery module 20a and the second end plate 2 of the second battery module 20b, and the other opposite end of the first battery module 20a and the second battery module 20b are connected through the second end plate 2 of the first battery module 20a and the first end plate 1 of the second battery module 20b. In some examples, the connection between the first end plate 1 of the first battery module 20a and the second end plate 2 of the second battery module 20b can be: the first connecting hole 14 of the first end plate 1 and the second connecting hole 24 of the second end plate 2 can be connected by bolts 4, which is simple in structure and convenient in operation.

[0069] In some implementations, see Figure 2 The first end plate 1 is provided with a third connecting hole 15, which extends from the surface of the first protrusion 11 facing away from the second side toward the second side. The second end plate 2 is provided with a fourth connecting hole, which extends from the inner wall surface of the second recess 22 toward the second side to the second side. The fourth connecting hole is used to connect with the third connecting hole 15 of another adjacent battery module 20.

[0070] In the above scheme, the fourth connecting hole of the second end plate 2 and the third connecting hole 15 of the first end plate 1 can be connected by bolts 4, which is simple in structure and convenient in operation. In addition, both ends of the first battery module 20a and the second battery module 20b can be connected by bolts 4, which is simple and stable in connection structure and facilitates the disassembly and assembly of the first battery module 20a and the second battery module 20b.

[0071] In some examples, the first connecting hole 14 and the second connecting hole 24 are connected by a bolt 4. For example, the first connecting hole 14 is a through hole, and the second connecting hole 24 is a second threaded hole. The bolt 4 is inserted into the first connecting hole 14 from the first side and then connected to the second connecting hole 24 by threads. The structure is simple and the connection structure is stable.

[0072] In other examples, both the first connecting hole 14 and the second connecting hole 24 are through holes. The side of the second connecting hole 24 away from the first connecting hole 14 is connected to the second connecting hole 24 and a receiving hole is provided. A nut is placed in the receiving hole, and the bolt passes through the first connecting hole 14 and the second connecting hole 24 and is connected to the nut.

[0073] In some examples, the number of first connection holes 14 and second connection holes 24 is the same, and the number of first connection holes 14 and second connection holes 24 can be 1, 2, 3, etc. The number of first connection holes 14 and second connection holes 24 can be determined according to the volume of battery module 20. As the volume of battery module 20 increases, the number of first connection holes 14 and second connection holes 24 can increase.

[0074] In some specific examples, there are two of each of the first connecting hole 14 and the second connecting hole 24, and they are arranged along the length of the first end plate 1 and the second end plate 2.

[0075] It should be understood that the number, setting method and connection method of the fourth connecting hole and the third connecting hole 15 can be set with reference to the number, setting method and connection method of the first connecting hole 14 and the second connecting hole 24, and will not be repeated here.

[0076] In some implementations, see Figure 2 , Figure 4 The first end plate 1 has a first surface 13 facing the first side, a first protrusion 11 disposed on the first surface 13, and a first recess 12 recessed from the first surface 13 towards the second side. In the above solution, since the first recess 12 is recessed from the first surface 13 towards the second side, when the first connecting hole 14 and the second connecting hole 24 are connected by bolts 4, the bolt head can be placed inside the first recess 12, preventing the bolt head from interfering with the connection between the first end plate 1 and the second end plate 2 of the two adjacent battery modules 20, thus improving the connection convenience. Furthermore, when the first connecting hole 14 and the second connecting hole 24 are connected by bolts, the bolt head can be placed inside the first recess 12, preventing the bolt head from interfering with the connection between the first end plate 1 and the second end plate 2 of the two adjacent battery modules 20, thus improving the connection convenience.

[0077] In some examples, the first recess 12 has a recess depth greater than the height of the bolt head along its recess direction.

[0078] In some implementations, see Figure 2 , Figure 4The second end plate 2 has a second surface 23 facing the first side, a second protrusion 21 is provided on the second surface 23, and a second recess 22 is recessed from the second surface 23 towards the second side. The fourth connecting hole extends from the inner wall surface of the second recess 22 towards the second side to the second side. When the fourth connecting hole and the third connecting hole 15 are connected by bolts, the bolt head can be placed in the second recess 22 to prevent the bolt head from interfering with the connection between the first end plate 1 and the second end plate 2 of the two adjacent battery modules 20, thereby improving the convenience of connection.

[0079] In some other embodiments, when multiple battery modules 20 are arranged and connected sequentially along the arrangement direction of the first end plate 1 and the second end plate 2, the first protrusion 11 and the first recess 12 can be provided on the surface of the first end plate 1 facing away from the second end plate 2, and the second protrusion 21 and the second recess 22 can be provided on the surface of the second end plate 2 facing away from the first end plate 1.

[0080] In some implementations, see Figure 2 , Figure 3 The battery module 20 also includes a connector 5, which is connected between the first end plate 1 and the second end plate 2. The first end plate 1 and the second end plate 2 are connected by the connector 5, so that the first end plate 1 and the second end plate 2 form a stable connection structure, preventing the multiple cells 3 in the battery module 20 from being scattered during transportation or use, and improving the stability of the battery module 20.

[0081] It should be noted that in this embodiment, the battery cell 3 is stacked along the thickness direction, that is, the thickness direction of the battery cell 3 is consistent with the arrangement direction of the first end plate 1 and the second end plate 2, the length direction of the battery cell 3 is consistent with the length direction of the first end plate 1 and the second end plate 2, and the width direction of the battery cell 3 is consistent with the width direction of the first end plate 1 and the second end plate 2.

[0082] In some examples, the connector 5 may be a connecting plate that is connected to the first end plate 1 and the second end plate 2 along the thickness direction of the cell 3.

[0083] In other examples, connector 5 may be a connecting rod that connects to the first end plate 1 and the second end plate 2 along the thickness direction of the cell 3.

[0084] In some embodiments, the connector 5 is detachably connected to the first end plate 1; and / or, the connector 5 is detachably connected to the second end plate 2. The detachable connection of the connector 5 to the first end plate 1 and / or the second end plate 2 improves the flexibility of the connection between the first end plate 1 and the second end plate 2, and allows the first end plate 1 and the second end plate 2 to be reused. This is in contrast to the first end plate 1 and the second end plate 2 being non-detachably connected by the connector 5, facilitating disassembly, assembly, and maintenance.

[0085] In some examples, the battery module 20 may include 3, 4, or 5 cells 3. When the number of cells 3 is different, the first end plate 1 and the second end plate 2 can be connected by replacing the connectors 5 of different lengths, which improves the flexibility of the connection of the battery module 20.

[0086] In some examples, connector 5 is detachably connected to the first end plate 1 and fixedly connected to the second end plate 2. For example, connector 5 is connected to the first end plate 1 by bolts, snap-fit, or other means, and connector 5 is connected to the second end plate 2 by welding.

[0087] In other examples, connector 5 is detachably connected to the second end plate 2 and non-detachably fixedly connected to the first end plate 1. For example, connector 5 is bolted to the second end plate 2 and welded to the first end plate 1.

[0088] In some other examples, connector 5 is detachably connected to both the first end plate 1 and the second end plate 2 by bolts.

[0089] In some embodiments, multiple battery cells 3 are connected to connectors 5. Connecting the battery cells 3 to connectors 5 improves the stability of the connection of the battery cells 3 in the battery module 20, prevents the battery cells 3 from shifting during transportation and use, thus preventing damage to the battery module 20 and improving the stability of the battery module 20.

[0090] In some examples, the battery cell 3 and the connector 5 are connected by screws. For example, a through hole is provided on the connector 5 corresponding to the position of the battery cell 3, and a screw hole is provided on the battery cell 3 corresponding to the position of the through hole. The connection between the connector 5 and the battery cell 3 is achieved by setting a screw in the through hole and screwing the screw into the screw hole of the battery cell 3.

[0091] In other examples, the battery cell 3 and the connector 5 can also be connected by snap-fitting, bonding, riveting, etc., which are not specifically limited in this application.

[0092] In some embodiments, the battery module 20 further includes an adhesive component disposed between the plurality of battery cells 3 and the connector 5. The adhesive component connects the battery cells 3 and the connector 5, facilitating operation.

[0093] In some examples, the adhesive is double-sided tape, and the connector 5 includes a connecting plate. The double-sided tape is arranged along the length of the connecting plate, with one side of the double-sided tape bonded to the connecting plate and the other side bonded to the battery cell 3.

[0094] In other examples, the adhesive is a structural adhesive, which is applied to the surface of the connecting plate and connected to the cell 3 before the structural adhesive cures.

[0095] In some embodiments, the battery module 20 includes a first side and a second side opposite to each other, the arrangement direction of the first side and the second side being perpendicular to the arrangement direction of the first end plate 1 and the second end plate 2, and the connector 5 being located on the first side. The first side of the battery module 20 is connected via the connector 5, which is simple in structure and convenient for connection.

[0096] In some examples, the second side of the battery module 20 has the same connection structure as the first side, and the second side is also connected via connector 5.

[0097] In other examples, the connection structure of the second side of the battery module 20 differs from that of the first side. For example, the second side may be connected via an X-shaped plate or a connecting rod.

[0098] In some embodiments, there are multiple connectors 5 arranged along a first direction, which is perpendicular to the arrangement direction of the first side and the second side, and also perpendicular to the arrangement direction of the first end plate 1 and the second end plate 2. By arranging multiple connectors 5 along the first direction, the connection strength between the first end plate 1 and the second end plate 2 is improved, preventing deformation of the battery module 20 during transportation and use, and improving the stability of the battery module 20.

[0099] In some examples, the number of connectors 5 can be 2, 3, 4, etc.

[0100] In some examples, multiple connectors 5 can be arranged at equal intervals.

[0101] In some implementations, see Figure 3 , Figure 5 The connector 5 includes a connecting portion 51 and a reinforcing portion 52. The connecting portion 51 is connected to multiple battery cells 3, and the reinforcing portion 52 is connected to the side of the connecting portion 51 that faces away from the multiple battery cells 3. The reinforcing portion 52 is provided on the side of the connecting portion 51 that faces away from the battery cells 3. By providing the reinforcing portion 52, the strength of the connector 5 is improved, preventing the connector 5 from deforming during the transportation and use of the battery module 20, and improving the structural stability of the battery module 20.

[0102] In some specific examples, the connecting part 51 includes a connecting plate, and the reinforcing part 52 includes a reinforcing plate. The connecting plate is connected to the battery cell 3 by an adhesive, which facilitates the fixing of the battery cell 3 and improves the stability of the battery cell 3 in the battery module 20. The connection between the reinforcing plate and the connecting plate increases the strength of the connecting plate, prevents deformation of the connecting plate, and improves the stability of the battery module 20.

[0103] In some examples, the reinforcing plate and the connecting plate are integrated. For example, the connector 5 is integrally formed by processes such as die casting, so that the connecting plate and the reinforcing plate are a single structure.

[0104] In other examples, the reinforcing plate and the connecting plate are detachably connected, for example, the reinforcing plate and the connecting plate are connected by bolts.

[0105] In some other examples, the reinforcing plate and the connecting plate are not detachably connected, for example, by welding.

[0106] In some examples, threaded holes 53 can be provided at both ends of the connector 5, and the connector 5 is connected to the first end plate 1 and the second end plate 2 by bolts through the threaded holes 53.

[0107] In some embodiments, along the first direction, the width of the connecting plate is greater than the width of the reinforcing plate; and / or, along the arrangement direction of the connecting plate and the reinforcing plate, the thickness of the reinforcing plate is greater than the thickness of the connecting plate. The greater width of the connecting plate compared to the reinforcing plate in the first direction results in stronger resistance to deformation in that direction. The greater thickness of the reinforcing plate compared to the connecting plate also results in stronger resistance to deformation along the arrangement direction of the connecting plate and the reinforcing plate. This structure ensures structural stability after the reinforcing plate and the connecting plate are connected, reducing deformation and improving the structural stability of the battery module 20.

[0108] In some examples, the cross-section of the reinforcing plate and the connecting plate after connection is an inverted T-shaped structure, which has good resistance to deformation during hoisting and improves the stability of the battery module 20 structure.

[0109] In some implementations, see Figure 3 The battery module 20 also includes a heat insulation component 6, which is disposed on the side of the plurality of battery cells 3 facing the connector 5. Since the connection between two adjacent battery modules 20 is achieved by the first end plate 1 of one battery module 20 being opposite and connected to the second end plate 2 of another battery module 20, and by the second end plate 2 of one battery module 20 being opposite and connected to the first end plate 1 of another battery module 20, the heat insulation component 6 is disposed on the side of the plurality of battery cells 3 facing the connector 5. The heat insulation component 6 will be located between two adjacent battery modules 20. In this way, by setting the heat insulation component 6, the temperature transfer between two adjacent battery modules 20 is isolated, which plays a role in heat insulation and flame retardancy.

[0110] The heat insulation component 6 can effectively prevent the heat generated by the battery cell 3 during high-rate charging and discharging, and prevent the heat from being transferred to the adjacent battery cell 3, thereby delaying or blocking the heat transfer to the adjacent battery cell 3 and preventing the domino effect of thermal runaway.

[0111] In some examples, the material of the insulation 6 may be a resin material.

[0112] In other examples, the material of the insulation 6 can be mica.

[0113] In some examples, the insulation element 6 can be a plate-like structure, a block-like structure, etc.

[0114] In some implementations, see Figure 3 The heat insulation component 6 is located on the side of the connector 5 facing away from the multiple battery cells 3. The heat insulation component 6 is positioned on the side of the connector 5 facing away from the battery cells 3, and the connector 5 can support the heat insulation component 6, improving its stability. Furthermore, when two adjacent battery modules 20 are connected, the two battery modules 20 contact each other through the heat insulation component 6, effectively preventing temperature transfer between the two battery modules 20.

[0115] In some implementations, see Figure 2 , Figure 3 The battery module 20 also includes a support member 7, which is located on the side of the plurality of battery cells 3 facing away from the connector 5. The first end plate 1 and the second end plate 2 are both connected to the support member 7. In the battery module 20, the first end plate 1 and the second end plate 2 are connected on one side of the battery cell 3 via the connector 5, and on the other side of the battery cell 3 via the support member 7. In this way, the first end plate 1, the connector 5, the second end plate 2, and the support member 7 form the aforementioned frame structure in four directions of the battery cell 3, improving the stability of fixing the battery cell 3.

[0116] In some examples, the support 7 consists of multiple connecting rods, one end of which is connected to the first end plate 1 and the other end of which is connected to the second end plate 2, to provide support for the multiple battery cells 3.

[0117] In some specific examples, the support member 7 includes a support plate. One end of the support plate is connected to the first end plate 1, and the other end is connected to the second end plate 2. There may be one or more support plates.

[0118] In some implementations, see Figure 2 , Figure 3 The support member 7 further includes a first connecting piece 71, which is connected to the support plate and located on the side of the first end plate 1 opposite to the second end plate 2. The first connecting piece 71 is detachably connected to the first end plate 1. And / or, the support member 7 further includes a second connecting piece, which is connected to the support plate and located on the side of the second end plate 2 opposite to the first end plate 1. The second connecting piece is detachably connected to the second end plate 2. The support member 7 is connected to the first end plate 1 via the first connecting piece 71 and to the second end plate 2 via the second connecting piece. Since the first connecting piece 71 is located on the side of the first end plate 1 opposite to the second end plate 2, and the second connecting piece is located on the side of the second end plate 2 opposite to the first end plate 1, the first connecting piece 71 and the second connecting piece are exposed, facilitating connection with the first end plate 1 and the second end plate 2 and improving the ease of connection between the support member 7 and the first end plate 1 and the second end plate 2.

[0119] In some examples, the first connecting piece 71 can be a single piece, and the first connecting piece 71 is provided with multiple connecting holes, which are connected to the first end plate 1 by bolts.

[0120] In other examples, there may be multiple first connecting pieces 71, each with a connecting hole, and the multiple connecting holes on the multiple connecting pieces are connected to the first end plate 1 by bolts.

[0121] It should be understood that the arrangement of the second connecting piece and its connection structure with the second end plate 2 can be referenced to the arrangement of the first connecting piece 71 and the connection structure between the first connecting piece 71 and the first end plate 1, and will not be elaborated here.

[0122] In some other embodiments, the support member 7 may only include the support plate, that is, it does not include the first connecting piece 71 and the second connecting piece. In this case, the support member 7 can be connected to the side of the first end plate 1 opposite to the connecting member 5 and to the side of the second end plate 2 opposite to the connecting member 5 by means of screwing, snap-fitting or other connection methods.

[0123] In some implementations, see Figure 3 The battery module 20 also includes a heating element 8, which is located between the support member 7 and the multiple battery cells 3. The heating element 8 heats the battery cells 3, improving their performance at low temperatures. Specifically, in low-temperature environments, the discharge capacity and lifespan of the battery cells 3 are affected, and there is even a risk of internal short circuits and thermal runaway caused by lithium plating during charging. Preheating the battery with the heating element 8 can effectively prevent these problems and extend the battery's lifespan.

[0124] In some examples, the heating element 8 can be a PTC heating element, which is a variable resistance heating element with features such as automatic temperature control, no open flame, and high heat conversion efficiency. When the temperature rises, the resistance of the PTC heating element increases, thereby automatically adjusting the temperature and preventing overheating.

[0125] In some specific examples, the heating element 8 includes a heating plate. The heating plate is typically composed of a metal heating wire or conductive particles, which are in close contact with the surface of the battery cell 3 for heating. This heating method is highly effective. Furthermore, the heating plate has the advantage of being thin, allowing it to be positioned between the battery cell 3 and the support member 7.

[0126] When a heating element is used to heat the battery cell 3, the heating element can be positioned between the support member 7 and the battery cell 3, or between the connector 5 and the battery cell 3. To improve the stability of the battery cell 3, when the heating element is positioned between the support member 7 and the battery cell 3, the heating element and the battery cell 3 can be bonded together using structural adhesive, and the heating element and the support member 7 can be bonded together using double-sided adhesive. When the heating element is positioned between the connector 5 and the battery cell 3, the heating element and the connector 5 can be bonded together using double-sided adhesive, and the heating element and the battery cell 3 can be bonded together using structural adhesive.

[0127] In some embodiments, the battery pack includes multiple battery modules 20, with the first end plate 1 of one of two adjacent battery modules 20 facing and connected to the second end plate 2 of the other battery module 20. The first recess 12 of one battery module 20 is connected to the second protrusion 21 of the other battery module 20, and the first protrusion 11 of one battery module 20 is connected to the second recess 22 of the other battery module 20, modularizing the connection structure between adjacent battery modules 20 and improving the ease of connection between adjacent battery modules 20.

[0128] In some implementations, see Figure 6 The plurality of battery modules 20 include a first battery module 20a, a second battery module 20b, and a third battery module 20c, wherein the second battery module 20b is connected between the first battery module 20a and the third battery module 20c. A first recess 12 of the first battery module 20a is connected to a second protrusion 21 of the second battery module 20b, and a second recess 22 of the second battery module 20b is connected to a first protrusion 11 of the third battery module 20c. The second recess 22 of the first battery module 20a is connected to the first protrusion 11 of the second battery module 20b, and the first recess 12 of the second battery module 20b is connected to the second protrusion 21 of the third battery module 20c.

[0129] In this way, adjacent battery modules 20 are connected by the first recess 12 and the second protrusion 21, and the second recess 22 and the first protrusion 11, respectively. Specifically, the first recess 12 and the second protrusion 21 are connected by the first connecting hole 14 and the second connecting hole 24, and the second recess 22 and the first protrusion 11 are connected by the fourth connecting hole and the third connecting hole 15. The first connecting hole 14 and the second connecting hole 24, and the fourth connecting hole and the third connecting hole 15 are all connected by bolts 4. Therefore, the first battery module 20a and the second battery module 20b, and the second battery module 20b and the third battery module 20c are all connected by bolts 4, which makes the connection structure simple and easy to disassemble.

[0130] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0131] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery module, characterized in that, It includes a first end plate (1), a second end plate (2) and a plurality of battery cells (3), wherein the plurality of battery cells (3) are disposed between the first end plate (1) and the second end plate (2); The first end plate (1) is provided with a first recess (12) and a first protrusion (11), and the second end plate (2) is provided with a second recess (22) and a second protrusion (21). Along the arrangement direction of the first end plate (1) and the second end plate (2), the first recess (12) corresponds to the second protrusion (21), and the first protrusion (11) corresponds to the second recess (22). The first recess (12) of one battery module is connected to the second protrusion (21) of another battery module, and the second recess (22) of one battery module is connected to the first protrusion (11) of another battery module.

2. The battery module according to claim 1, characterized in that, The battery module includes a first side and a second side opposite to each other, and the arrangement direction of the first side and the second side is perpendicular to the arrangement direction of the first end plate (1) and the second end plate (2); The first end plate (1) has a first surface (13) facing the first side, the first protrusion (11) is provided on the first surface (13), and the first recess (12) is recessed from the first surface (13) toward the second side; The second end plate (2) has a second surface (23) facing the first side, the second protrusion (21) is provided on the second surface (23), and the second recess (22) is recessed from the second surface (23) toward the second side.

3. The battery module according to claim 2, characterized in that, The first end plate (1) is provided with a first connecting hole (14), which extends from the first recess (12) toward the inner wall surface of the second side to the second side; The second end plate (2) is provided with a second connecting hole (24), which extends from the surface of the second protrusion (21) facing away from the second side toward the second side; The first connection hole (14) is used to connect to the second connection hole (24) of the adjacent battery module.

4. The battery module according to claim 2, characterized in that, The first end plate (1) is provided with a third connecting hole (15), which extends from the surface of the first protrusion (11) facing away from the second side toward the second side; The second end plate (2) is provided with a fourth connecting hole, which extends from the inner wall surface of the second recess (22) toward the second side to the second side; The fourth connection hole is used to connect with the third connection hole (15) of the other adjacent battery module.

5. The battery module according to any one of claims 1-4, characterized in that, It also includes a connector (5) which is connected between the first end plate (1) and the second end plate (2).

6. The battery module according to claim 5, characterized in that, The connector (5) is detachably connected to the first end plate (1); and / or, the connector (5) is detachably connected to the second end plate (2).

7. The battery module according to claim 5, characterized in that, Multiple of the battery cells (3) are connected to the connector (5).

8. The battery module according to claim 5, characterized in that, It also includes an adhesive component disposed between the plurality of the battery cells (3) and the connector (5).

9. The battery module according to claim 5, characterized in that, The battery module includes a first side and a second side opposite to each other, and the arrangement direction of the first side and the second side is perpendicular to the arrangement direction of the first end plate (1) and the second end plate (2); the connector (5) is located on the first side.

10. The battery module according to claim 9, characterized in that, The number of connectors (5) is multiple, and the multiple connectors (5) are arranged along a first direction, which is perpendicular to the arrangement direction of the first side and the second side, and perpendicular to the arrangement direction of the first end plate (1) and the second end plate (2).

11. The battery module according to claim 10, characterized in that, The connector (5) includes a connecting part (51) and a reinforcing part (52). The connecting part (51) is connected to a plurality of the battery cells (3), and the reinforcing part (52) is connected to the side of the connecting part (51) opposite to the plurality of battery cells (3).

12. The battery module according to claim 11, characterized in that, The connecting part (51) includes a connecting plate, and the reinforcing part (52) includes a reinforcing plate.

13. The battery module according to claim 12, characterized in that, Along the first direction, the width of the connecting plate is greater than the width of the reinforcing plate; And / or, along the arrangement direction of the connecting plate and the reinforcing plate, the thickness of the reinforcing plate is greater than the thickness of the connecting plate.

14. The battery module according to claim 5, characterized in that, It also includes a heat insulation element (6), which is disposed on the side of the plurality of cells (3) facing the connector (5).

15. The battery module according to claim 14, characterized in that, The heat insulation element (6) is located on the side of the connector (5) opposite to the plurality of battery cells (3).

16. The battery module according to claim 5, characterized in that, It also includes a support member (7), which is disposed on the side of the plurality of cells (3) facing away from the connector (5), and the first end plate (1) and the second end plate (2) are both connected to the support member (7).

17. The battery module according to claim 16, characterized in that, The support member (7) includes a support plate.

18. The battery module according to claim 17, characterized in that, The support member (7) further includes a first connecting piece (71), which is connected to the support plate and located on the side of the first end plate (1) facing away from the second end plate (2). The first connecting piece (71) is detachably connected to the first end plate (1). And / or, the support member (7) further includes a second connecting piece, which is connected to the support plate and located on the side of the second end plate (2) opposite to the first end plate (1), and the second connecting piece is detachably connected to the second end plate (2).

19. The battery module according to any one of claims 16-18, characterized in that, It also includes a heating element (8), which is disposed between the support (7) and the plurality of battery cells (3).

20. The battery module according to claim 19, characterized in that, The heating element (8) includes a heating plate.

21. A battery pack, characterized in that, Includes the battery module (20) according to any one of claims 1-20.

22. The battery pack according to claim 21, characterized in that, It includes multiple battery modules (20), wherein the first end plate (1) of one of two adjacent battery modules (20) is opposite to and connected to the second end plate (2) of the other battery module (20).

23. The battery pack according to claim 22, characterized in that, The plurality of battery modules (20) include a first battery module (20a), a second battery module (20b) and a third battery module (20c), wherein the second battery module (20b) is connected between the first battery module (20a) and the third battery module (20c); The first recess (12) of the first battery module (20a) is connected to the second protrusion (21) of the second battery module (20b), and the second recess (22) of the second battery module (20b) is connected to the first protrusion (11) of the third battery module (20c). The second recess (22) of the first battery module (20a) is connected to the first protrusion (11) of the second battery module (20b), and the first recess (12) of the second battery module (20b) is connected to the second protrusion (21) of the third battery module (20c).

24. An electrical appliance, characterized in that, It includes the battery module (20) according to any one of claims 1-20; or it includes the battery pack according to any one of claims 21-23.

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