Battery module and battery pack

Abstract

The application provides a battery module and a battery pack. The battery module comprises at least two cell assemblies, the at least two cell assemblies are arranged at intervals along a first direction, the cell assembly has an explosion-proof valve and a pole, and the explosion-proof valve and the pole are located on opposite sides of the cell assembly along the first direction; a connecting sheet is arranged between two adjacent cell assemblies along the first direction, a first end of the connecting sheet is electrically connected with a pole of one of the at least two cell assemblies, and a second end of the connecting sheet is electrically connected with a pole of another of the at least two cell assemblies; and the second end of the connecting sheet is movably arranged relative to the first end of the connecting sheet. The application avoids the phenomenon that the explosion-proof valve sprays after the thermal runaway of the adjacent cell, and the exhaust path is relatively short.

Description

Technical Field

[0001] This application relates to a battery module and battery pack, belonging to the field of new energy battery technology. Background Technology

[0002] Electric vehicles are zero-emission compared to traditional gasoline vehicles. They not only replace oil with electricity and reduce emissions of greenhouse gases and other pollutants, but their discarded lithium batteries can also be used to manufacture energy storage devices for reuse.

[0003] In the process of conceiving and implementing this application, the applicant discovered at least the following problems: Currently, multiple sets of battery cell modules are arranged at intervals, and the explosion-proof valves of the battery cell modules face the central area of ​​the battery module. When a battery cell experiences thermal runaway, the entire explosion-proof venting path is relatively long.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] This application provides a battery module and battery pack that avoids the phenomenon of explosion-proof valves spraying outwards after thermal runaway of adjacent cells, and also has a shorter exhaust path.

[0006] This application provides a battery module, including:

[0007] At least two battery cell assemblies are arranged at intervals along a first direction, and each battery cell assembly has an explosion-proof valve and a terminal post, which are located on opposite sides of the battery cell assembly along the first direction.

[0008] A connecting piece is disposed between two adjacent battery cell assemblies along a first direction. The first end of the connecting piece is electrically connected to the terminal of one of the at least two battery cell assemblies, and the second end of the connecting piece is electrically connected to the terminal of the other of the at least two battery cell assemblies.

[0009] The second end of the connecting piece is movably positioned relative to the first end of the connecting piece.

[0010] The beneficial effects of this application are: the folding design of the connecting piece between the battery cells facilitates the welding and installation of the connecting piece and the battery cells; at the same time, since the connecting piece is set in the middle, it means that the explosion-proof valves in both sets of battery cells are set outwards, which on the one hand avoids the explosion-proof valves spraying against each other after thermal runaway of adjacent battery cells, and on the other hand, the exhaust path is shorter.

[0011] In some alternative embodiments, the connecting piece includes a first connecting portion, a second connecting portion, and a third connecting portion, wherein the first connecting portion and the second connecting portion are respectively connected to opposite sides of the third connecting portion;

[0012] The first connection portion is electrically connected to the terminal of one of at least two battery cell assemblies, and the second connection portion is electrically connected to the terminal of the other of at least two battery cell assemblies.

[0013] It should be noted that the first and second connecting parts are used to fix the two battery cell terminals (e.g., by laser welding, bolt fixing, etc.). The third connecting part is located between the two, which concentrates deformation and stress, thus protecting the electrical connection points on both sides.

[0014] In some alternative implementations, the connecting piece has a first mounting state and a second mounting state;

[0015] When the connecting piece is in the first installation state, there is an angle between the extension direction of the first connecting part and the extension direction of the second connecting part;

[0016] When the connecting piece switches from the first installation state to the second installation state, the second connecting part rotates relative to the first connecting part, and the extension direction of the first connecting part and the extension direction of the second connecting part are the same.

[0017] It should be noted that this design provides flexibility during installation, making operation simpler, and becomes stable after installation, ensuring electrical performance.

[0018] In some alternative embodiments, the connecting piece also has a bending groove, which is disposed between the second connecting portion and the third connecting portion;

[0019] The bending groove is configured to extend along the width direction of the connecting piece so that the second connecting portion can rotate relative to the first connecting portion.

[0020] It should be noted that the design of the bending groove facilitates the rotation of the second connecting part, and since the connecting piece is a metal structural piece, it means that a bending groove can be pre-processed on the connecting piece.

[0021] In some alternative implementations, the battery module further includes a liquid cooling plate and an epoxy plate, with the liquid cooling plate located between two adjacent cell assemblies;

[0022] The epoxy board is placed between the liquid cooling plate and the battery cell assembly.

[0023] It should be noted that the liquid cooling plate is placed between the two battery cell assemblies, forming a so-called double-sided cooling layout. Both large surfaces of the battery cell assembly (usually the surfaces that generate the most heat) can contact the liquid cooling plate, resulting in a large heat exchange area and extremely high heat dissipation efficiency. This effectively controls the operating temperature of the battery cell and prevents overheating.

[0024] In some alternative implementations, the cell assembly includes a cell body and terminals disposed on the cell body;

[0025] The battery cell body includes multiple first sub-cells and multiple second sub-cells. The first sub-cells and second sub-cells are arranged along the thickness direction of the battery module, with the first sub-cells located above the second sub-cells.

[0026] Multiple first sub-cells and multiple second sub-cells are spaced apart along the second direction;

[0027] Wherein, one of the first direction and the second direction is the length direction of the battery module, and the other of the first direction and the second direction is the width direction of the battery module.

[0028] It should be noted that the battery cell body has a multi-layer structure, in which multiple sub-cells in the battery cell body on both sides conduct electricity through connecting plates and exchange heat through liquid cooling plates.

[0029] In some alternative implementations, the cell assembly further includes an electrical connector connected between the cell body and the connecting piece;

[0030] Along the second direction, the electrical connector is located in the middle of the battery module.

[0031] It should be noted that the purpose of the electrical connector is to improve the electrical connection strength between the connector and the battery cell body.

[0032] In some alternative embodiments, the electrical connector includes an electrode tray and an electrode connector, the electrode connector being disposed on the electrode tray and electrically connected to the electrode post;

[0033] The electrode tray is located between the electrode connector and the cell body.

[0034] It should be noted that the electrode tray provides support and protection for the electrode connector, preventing it from deforming due to accidental collisions or vibrations, thereby ensuring the stability of the electrical connection.

[0035] In some alternative implementations, at least one of the first sub-cell and the second sub-cell is a cylindrical cell.

[0036] It should be noted that cylindrical cells have a high degree of standardization and can be flexibly combined into modules of different shapes and capacities, making them particularly suitable for irregularly shaped battery pack spaces.

[0037] In addition, this application also provides a battery pack, including a housing and the aforementioned battery module;

[0038] The battery module is located inside the housing.

[0039] The battery module and battery pack provided in this application include a housing and the aforementioned battery module; the battery module is disposed within the housing; the battery module includes at least two cell assemblies, which are spaced apart along a first direction, each cell assembly having an explosion-proof valve and a terminal post, which are located on opposite sides of the cell assembly along the first direction; a connecting piece is disposed between two adjacent cell assemblies along the first direction, with a first end electrically connected to a terminal post of one of the at least two cell assemblies, and a second end electrically connected to a terminal post of the other of the at least two cell assemblies; wherein the second end of the connecting piece is movably disposed relative to the first end of the connecting piece.

[0040] The folding design of the connecting piece between the battery cells facilitates the welding and installation of the connecting piece and the battery cell assembly. At the same time, since the connecting piece is located in the middle, it means that the explosion-proof valves in both sets of battery cells are set outwards. This avoids the explosion-proof valves from spraying outwards after thermal runaway of adjacent battery cells, and also results in a shorter exhaust path. Attached Figure Description

[0041] The above and other objects, features, and advantages of embodiments of this application will become more readily understood through the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application will be described by way of example and non-limitation, wherein:

[0042] Figure 1 This is a schematic diagram of the battery module structure according to an embodiment of this application;

[0043] Figure 2 This is an exploded view of the battery module according to an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of the first sub-cell or the second sub-cell in the battery module of this application embodiment;

[0045] Figure 4 This is a schematic diagram of the assembly of the connecting piece and the cell body in the first installation state of the battery module according to an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the connecting piece in the first installation state of the battery module according to an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the connecting piece in the second installation state of the battery module according to an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the positive electrode series busbar in the battery module according to an embodiment of this application;

[0049] Figure 8 This is a schematic diagram of the negative electrode series busbar in the battery module of this application embodiment;

[0050] Figure 9 This is a schematic diagram of the electrode tray structure in the battery module according to an embodiment of this application;

[0051] Figure 10 This is a schematic diagram of the liquid cooling plate in the battery module of this application embodiment.

[0052] Figure label:

[0053] 100-Battery Module;

[0054] 110 - Battery cell assembly;

[0055] 111 - First sub-cell;

[0056] 112 - Second cell;

[0057] 101-Explosion-proof valve;

[0058] 113 - Electrical connectors;

[0059] 1131 - Electrode tray;

[0060] 1132 - Electrode connector;

[0061] 1133 - First arc-shaped groove;

[0062] 1134 - Second arc-shaped groove;

[0063] 120 - Connecting piece;

[0064] 121 - First connecting part;

[0065] 122 - Second connecting part;

[0066] 123 - Third connecting part;

[0067] 124 - Bending groove;

[0068] 130-Liquid Cooling Plate;

[0069] 140-Epoxy Board;

[0070] 150 - Positive series busbar;

[0071] 160 - Negative electrode series busbar. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. All other obtained embodiments are within the scope of protection of this application. In the absence of conflict, the following embodiments and features can be combined with each other.

[0073] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0074] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] In the process of conceiving and implementing this application, the applicant discovered at least the following problems: Currently, multiple sets of battery cell modules are arranged at intervals, and the explosion-proof valves of the battery cell modules face the central area of ​​the battery module. When a battery cell experiences thermal runaway, the entire explosion-proof venting path is relatively long.

[0077] The battery module proposed in this application uses a folding design for the connecting piece between the battery cells to facilitate the welding and installation of the connecting piece and the battery cells. At the same time, since the connecting piece is located in the middle, it means that the explosion-proof valves in both sets of battery cells are set outwards. This avoids the explosion-proof valves from spraying outwards after thermal runaway of adjacent battery cells, and also results in a shorter exhaust path.

[0078] The battery module provided in this application will be described in detail below with reference to specific embodiments.

[0079] Figure 1 This is a schematic diagram of the battery module structure according to an embodiment of this application. Figure 2 This is an exploded view of the battery module according to an embodiment of this application. Figure 3 This is a schematic diagram of the structure of the first or second sub-cell in the battery module of this application embodiment.

[0080] like Figures 1 to 3 As shown in the figure, this application embodiment proposes a battery module 100, including:

[0081] At least two battery cell assemblies 110 are arranged at intervals along a first direction. Each battery cell assembly 110 has an explosion-proof valve 101 and a terminal post, which are located on opposite sides of the battery cell assembly 110 along the first direction.

[0082] The connecting piece 120 is disposed between two adjacent battery cell assemblies 110 along a first direction. The first end of the connecting piece 120 is electrically connected to the terminal of one of the at least two battery cell assemblies 110, and the second end of the connecting piece 120 is electrically connected to the terminal of the other of the at least two battery cell assemblies 110.

[0083] The second end of the connecting piece 120 is movably positioned relative to the first end of the connecting piece 120.

[0084] It should be noted that multiple battery cell assemblies 110 are arranged along a specific direction and have gaps between them, which provide physical space for subsequent thermal runaway management.

[0085] The explosion-proof valve 101 and the terminal post are located on opposite sides of the cell assembly 110 in the first direction, and the connecting piece 120 is located between the terminals of the two cell assemblies 110. This means that the terminals of the two cell assemblies 110 are close to each other and are arranged opposite each other. Thus, the terminals of the two cell assemblies 110 are located in the middle of the battery module 100, and the explosion-proof valve 101 faces outward.

[0086] Since the explosion-proof valve 101 and the terminal are located on opposite sides of the battery cell, when one of the battery cells in the battery cell assembly 110 (let's say battery cell A) experiences thermal runaway, its ejected material will spray along the side away from the terminal (i.e. towards the outside of the module or the reserved pressure relief channel).

[0087] In the adjacent cell assembly 110, the terminal of cell A is connected to the terminal of cell B in the same assembly 110 via a connecting piece 120. However, the terminal is located on the other side of cell B, directly opposite the ejection direction of cell A. Therefore, it is difficult for the ejected material to directly impact the terminal.

[0088] This "back-to-back" layout naturally isolates the thermal runaway jet from the electrical connection points of adjacent cells, greatly reducing the risk of thermal propagation.

[0089] In addition, the second end of the connecting piece 120 is movably configured relative to the first end of the connecting piece 120. Specifically, the first end of the connecting piece 120 is welded to the terminal of one of at least two battery cell assemblies 110, and the second end of the connecting piece 120 is welded to the terminal of the other of at least two battery cell assemblies 110. After all welding is completed, the second end of the connecting piece 120 is rotated so that the two battery cell assemblies 110 are arranged side by side along the first direction.

[0090] The second end of the connecting piece 120 is movable to facilitate welding and installation between the structures and to improve the strength of the installation.

[0091] The above-mentioned design, namely the folding design of the connecting piece 120 between the battery cell assemblies 110, facilitates the welding and installation of the connecting piece 120 and the battery cell assemblies 110. At the same time, since the connecting piece 120 is located in the middle, it means that the explosion-proof valves 101 in both sets of battery cell assemblies 110 are set outwards, avoiding the phenomenon of explosion-proof valves 101 spraying outwards after thermal runaway of adjacent battery cells.

[0092] Figure 4 This is a schematic diagram of the assembly of the connecting piece and the cell body in the first installation state of the battery module according to an embodiment of this application. Figure 5 This is a schematic diagram of the connecting piece in the first installation state of the battery module according to an embodiment of this application. Figure 6 This is a schematic diagram of the connecting piece in the second installation state of the battery module according to an embodiment of this application.

[0093] like Figures 2 to 6 As shown, in some optional embodiments, the connecting piece 120 includes a first connecting portion 121, a second connecting portion 122, and a third connecting portion 123, wherein the first connecting portion 121 and the second connecting portion 122 are respectively connected to opposite sides of the third connecting portion 123;

[0094] The first connection portion 121 is electrically connected to the terminal of one of at least two battery cell assemblies 110, and the second connection portion 122 is electrically connected to the terminal of the other of at least two battery cell assemblies 110.

[0095] It should be noted that the first connecting part 121 and the second connecting part 122 are used to fix the two battery cell terminals (e.g., by laser welding, bolt fixing, etc.). The third connecting part 123 is the part located between the two, which controls deformation and stress concentration in the third connecting part 123, while protecting the electrical connection points on both sides.

[0096] It should be noted that by making the first connecting part 121, the second connecting part 122, and the third connecting part 123 integrally formed, not only can the connection strength between the first connecting part 121, the second connecting part 122, and the third connecting part 123 be improved, but also a seamless connection between the first connecting part 121, the second connecting part 122, and the third connecting part 123 can be achieved, thereby reducing the risk of cracking at the connection position of the first connecting part 121, the second connecting part 122, and the third connecting part 123.

[0097] In some alternative embodiments, the connecting piece 120 has a first mounting state and a second mounting state;

[0098] When the connecting piece 120 is in the first installation state, there is an angle between the extending direction of the first connecting part 121 and the extending direction of the second connecting part 122;

[0099] When the connecting piece 120 switches from the first installation state to the second installation state, the second connecting part 122 rotates relative to the first connecting part 121, and the extension direction of the first connecting part 121 and the extension direction of the second connecting part 122 are the same.

[0100] It should be noted that this design provides flexibility during installation, making operation simpler, and becomes stable after installation, ensuring electrical performance.

[0101] It should be noted that the assembly worker can first weld the first connecting part 121 onto the terminal of a battery cell. At this time, because there is an angle between the extending direction of the second connecting part 122 and the extending direction of the first connecting part 121, a larger operating space is provided for the welding process. Then, the second connecting part 122 is rotated to its final position by hand or tool.

[0102] In some alternative embodiments, the connecting piece 120 also has a bending groove 124, which is disposed between the second connecting portion 122 and the third connecting portion 123;

[0103] The bending groove 124 is configured to extend along the width direction of the connecting piece 120 so that the second connecting portion 122 rotates relative to the first connecting portion 121.

[0104] It should be noted that the design of the bending groove 124 facilitates the rotation of the second connecting part 122, and since the connecting piece 120 is a metal structural piece, it means that a bending groove 124 can be pre-processed on the connecting piece 120.

[0105] This can be understood as the bending groove 124 being a preset hinge groove for precise bending.

[0106] Furthermore, the bending groove 124 extends along the width direction, which means that the bending groove 124 is a straight groove. It determines the axis and direction of bending, ensuring that the bending action is regular and controllable.

[0107] The bending groove 124, acting as a pre-designed weak point, greatly reduces the force required for bending at this location, allowing the second connecting part 122 to rotate easily and accurately around the groove. Without this groove, attempting to bend a thick metal connecting piece 120 would be extremely difficult, and the bending position and angle would be hard to control.

[0108] Figure 7 This is a schematic diagram of the positive electrode series busbar in the battery module according to an embodiment of this application. Figure 8 This is a schematic diagram of the negative electrode series busbar in the battery module of this application embodiment.

[0109] like Figure 1 , Figure 2 , Figure 7 as well as Figure 8 As shown, in some embodiments, the battery module 100 further includes a positive terminal series busbar 150 and a negative terminal series busbar 160. The positive terminal series busbar 150 is designed in an "L" shape to facilitate its exit from the module output terminal. The negative terminal series busbar 160 is designed in an "L" shape to facilitate its exit from the module output terminal.

[0110] like Figures 1 to 6 As shown, in some optional embodiments, the battery module 100 further includes a liquid cooling plate 130 and an epoxy plate 140, wherein the liquid cooling plate 130 is located between two adjacent cell assemblies 110.

[0111] The epoxy board 140 is located between the liquid cooling plate 130 and the battery cell assembly 110.

[0112] It should be noted that the liquid cooling plate 130 is placed between the two battery cell assemblies 110, forming a so-called double-sided cooling layout. Both large surfaces of the battery cell assembly 110 (usually the surfaces that generate the most heat) can contact the liquid cooling plate 130, resulting in a large heat exchange area and extremely high heat dissipation efficiency. This effectively controls the operating temperature of the battery cell and prevents overheating.

[0113] Furthermore, the liquid cooling plate 130 helps to keep the temperature of all cells in the module uniform, avoiding local overheating or undercooling, thereby extending the life cycle and performance of the entire battery pack.

[0114] It should be noted that epoxy board 140 is a type of board made of high-performance engineering plastics (such as epoxy resin), which has excellent electrical insulation, mechanical strength and certain heat resistance.

[0115] In some embodiments, the liquid cooling plate 130 is designed by extrusion or stamping process, and the bottom of the liquid cooling plate 130 is designed with a wave-like design or a flat design that is consistent with the bottom contour of the battery pack, so as to adapt to the wave-like design or flat design of the bottom plate of the housing.

[0116] In some embodiments, two epoxy boards 140 are used, and the two epoxy boards 140 are respectively attached to the front and back of the liquid cooling plate 130. One epoxy board 140 is bonded to the electrode area of ​​one cell assembly 110 to fix the cell assembly 110, and the other epoxy board 140 is bonded to the electrode area of ​​another cell assembly 110 to fix the cell assembly 110. This ensures that both cell assemblies are tightly bonded to the liquid cooling plate 130 and the epoxy board 140, completing the final assembly of the module. Then, the module is connected to the bottom plate of the battery pack by applying adhesive.

[0117] In some alternative embodiments, the cell assembly 110 includes a cell body with terminals disposed on the cell body;

[0118] The battery cell body includes multiple first sub-cells 111 and multiple second sub-cells 112. The first sub-cells 111 and the second sub-cells 112 are arranged along the thickness direction of the battery module 100, and the first sub-cells 111 are located above the second sub-cells 112.

[0119] Multiple first sub-cells 111 and multiple second sub-cells 112 are all spaced apart along the second direction;

[0120] Wherein, one of the first direction and the second direction is the length direction of the battery module 100, and the other of the first direction and the second direction is the width direction of the battery module 100.

[0121] It should be noted that the battery cell body has a multi-layer structure, in which multiple sub-cells in the battery cell body on both sides conduct electricity through connecting pieces 120 and exchange heat through liquid cooling plates 130.

[0122] In addition, for ease of explanation, the first direction is the width direction of the battery module 100, and the second direction is the length direction of the battery module 100.

[0123] It should be noted that, as Figure 1 As shown, X represents the length direction of the battery module 100, Y represents the width direction of the battery module 100, and Z represents the thickness direction of the battery module 100.

[0124] It should be noted that the first sub-cell 111 and the second sub-cell 112 have the same structure. For ease of explanation, the first sub-cell 111 will be used as the specific example.

[0125] The first sub-cell 111 is the smallest charging and discharging unit. The first sub-cell 111 has a positive electrode, a negative electrode, and a separator disposed between the two, and is formed into a cell by winding or stacking.

[0126] The positive electrode sheet includes a positive current collector and a positive active material layer, which can be one or two layers; that is, the positive active material layer is located on one side of the positive current collector, or the positive active material layer is located on opposite sides of the positive current collector.

[0127] For example, the positive current collector can be made of metal materials such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metal and insulating materials.

[0128] For example, the positive electrode active material layer includes a positive electrode active material, a conductive agent, a binder, etc., and the positive electrode active material includes one or more lithium-containing positive electrode active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0129] Similarly, the negative electrode sheet includes a negative current collector and a negative active material layer, which can be one or two layers; that is, the negative active material layer is located on one side of the negative current collector, or the negative active material layer is located on opposite sides of the negative current collector.

[0130] For example, the negative electrode current collector can be made of metal materials such as copper foil, aluminum foil, or stainless steel, or it can be a composite foil material formed by combining metal and insulating materials.

[0131] For example, the negative electrode active material layer includes a negative electrode active material, a conductive agent, a binder, etc., and the negative electrode active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0132] The tab serves as the current output terminal of the battery cell. The tab is either integrated with or separately connected to the positive or negative electrode.

[0133] The separator, as an insulating layer, is used to prevent short circuits inside the battery module 100 cells caused by contact between the positive and negative electrode plates. As a semi-permeable layer, the separator prevents larger molecules from passing through while allowing smaller charged ions to pass through.

[0134] Figure 9 This is a schematic diagram of the electrode tray structure in the battery module according to an embodiment of this application. Figure 10 This is a schematic diagram of the liquid cooling plate in the battery module of this application embodiment.

[0135] like Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, in some optional embodiments, the cell assembly 110 further includes an electrical connector 113, which is connected between the cell body and the connecting piece 120.

[0136] Along the second direction, the electrical connector 113 is located in the middle of the battery module 100.

[0137] It should be noted that the purpose of the electrical connector 113 is to improve the electrical connection strength between the connector 120 and the battery cell body.

[0138] Specifically, the connecting piece 120 is located at the end of the battery cell body and is electrically connected to the terminal post at the end of the battery cell body.

[0139] Electrical connector 113 is located between two adjacent cell bodies, wherein electrical connector 113 is electrically connected to the first sub-cell 111 and the second sub-cell 112 in the middle of the cell body, i.e., in series.

[0140] In some alternative embodiments, the electrical connector 113 includes an electrode tray 1131 and an electrode connector 1132, wherein the electrode connector 1132 is disposed on the electrode tray 1131 and is electrically connected to the electrode post.

[0141] The electrode tray 1131 is located between the electrode connector 1132 and the cell body.

[0142] It should be noted that the electrode tray 1131 provides support and protection for the electrode connector 1132, preventing it from deforming due to accidental collisions or vibrations, thereby ensuring the stability of the electrical connection.

[0143] Specifically, the electrode tray 1131 is an insulated, structural base. It is typically injection molded from high-performance engineering plastics (such as PPS, PPA, etc.). Its core function is to support and fix the electrode.

[0144] In some embodiments, the electrode connector 1132 is a conductive, functional component. It is typically a metal sheet (such as copper or aluminum) that is responsible for the actual current transmission and is mounted on the electrode tray 1131.

[0145] In some alternative implementations, at least one of the first sub-cell 111 and the second sub-cell 112 is a cylindrical cell.

[0146] It should be noted that cylindrical cells have a high degree of standardization and can be flexibly combined into modules of different shapes and capacities, making them particularly suitable for irregularly shaped battery pack spaces.

[0147] In some embodiments, one side of the electrode tray 1131 is designed with a wave structure that matches the upper end of the second sub-cell 112 and the lower end of the first sub-cell 111, and the cell ends are fixed by adhesive. The other side of the electrode tray 1131 is designed with a groove for the electrode connector 1132 to accommodate the electrode connector 1132.

[0148] For example, the electrode tray 1131 has a first arcuate groove 1133 and a second arcuate groove 1134, wherein the first arcuate groove 1133 matches the lower end of the first sub-cell 111 and the second arcuate groove 1134 matches the upper end of the second sub-cell 112.

[0149] The specific assembly process is as follows: at least two cell assemblies 110, wherein each cell assembly 110 includes a first sub-cell 111 and a second sub-cell 112 stacked vertically, an electrode tray 1131 at the end of the multi-layer cell is installed, and then electrode connectors 1132 are welded, a positive electrode series busbar 150 and a negative electrode series busbar 160 are connected; then, one cell assembly 110 is welded to the first connecting part 121 of the connecting piece 120, and another cell assembly 110 is welded to the second connecting part 122 of the connecting piece 120; then, an adhesive epoxy board 140 is pasted to the front and back of the liquid cooling plate 130 to fix the cell assembly 110; then, the other cell assembly 110 is folded along the bending groove 124 of the connecting piece 120 to ensure that both cell assemblies 110 are tightly attached to the liquid cooling plate 130 and the epoxy board 140, thus completing the final assembly of the module; then, the battery module 100 is connected to the bottom plate of the battery pack by applying adhesive.

[0150] The battery module provided in this application embodiment includes at least two battery cell assemblies, which are spaced apart along a first direction. Each battery cell assembly has an explosion-proof valve and a terminal post, which are located on opposite sides of the battery cell assembly along the first direction. A connecting piece is disposed between two adjacent battery cell assemblies along the first direction. The first end of the connecting piece is electrically connected to the terminal post of one of the at least two battery cell assemblies, and the second end of the connecting piece is electrically connected to the terminal post of the other at least two battery cell assemblies. The second end of the connecting piece is movably disposed relative to the first end of the connecting piece.

[0151] The folding design of the connecting piece between the battery cells facilitates the welding and installation of the connecting piece and the battery cell assembly. At the same time, since the connecting piece is located in the middle, it means that the explosion-proof valves in both sets of battery cells are set outwards. This avoids the explosion-proof valves from spraying outwards after thermal runaway of adjacent battery cells, and also results in a shorter exhaust path.

[0152] In addition, this application embodiment also provides a battery pack, including a housing and the aforementioned battery module 100;

[0153] The battery module 100 is located inside the housing.

[0154] In some examples, the housing can be a rectangular structure, and the size of the housing can be greater than or equal to the size of the battery module 100, so that the housing can support the battery module 100.

[0155] It is understandable that the housing has a receiving cavity, the function of which is to accommodate the battery module 100. It is easy to understand that the receiving cavity is in a sealed state to prevent side reactions from occurring in the internal system of the battery module 100, thereby affecting the performance of the battery module 100.

[0156] For example, the size or shape of the receiving cavity is matched with the size and shape of the battery module 100. Specifically, it can be adjusted according to the actual situation. This application embodiment does not impose too many restrictions here.

[0157] In this embodiment, the battery module 100 can be configured as a rectangular structure. The battery module 100 can be located inside the housing.

[0158] Understandably, the housing is designed to support the battery module 100.

[0159] The dimensions of the housing can be set according to actual needs, and this application embodiment does not impose any restrictions on them.

[0160] Additionally, it should be noted that this embodiment does not limit the shape of the shell. For example, the shell can be a regular shape such as a cuboid or a cylinder, or it can be other irregular shapes.

[0161] In some embodiments, the housing protects the battery module 100. The housing may be composed of two parts joined together for easy installation. The housing may be a metal shell; specifically, the material of the housing may be stainless steel, which is sturdy and corrosion-resistant. Of course, other materials may also be used for the housing, and this embodiment does not impose any specific limitations on this.

[0162] It should be noted that the specific structure of the battery module 100 will not be limited here, but can be referred to the above.

[0163] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0164] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery module (100), characterized in that, include: At least two battery cell assemblies (110) are arranged at intervals along a first direction, each battery cell assembly (110) having an explosion-proof valve (101) and a terminal post, the explosion-proof valve (101) and the terminal post being located on opposite sides of the battery cell assembly (110) along the first direction; A connecting piece (120) is disposed between two adjacent battery cell assemblies (110) along the first direction. A first end of the connecting piece (120) is electrically connected to the terminal of one of the at least two battery cell assemblies (110), and a second end of the connecting piece (120) is electrically connected to the terminal of the other of the at least two battery cell assemblies (110). The second end of the connecting piece (120) is movably disposed relative to the first end of the connecting piece (120).

2. The battery module (100) according to claim 1, characterized in that, The connecting piece (120) includes a first connecting part (121), a second connecting part (122) and a third connecting part (123), wherein the first connecting part (121) and the second connecting part (122) are respectively connected to opposite sides of the third connecting part (123); The first connection portion (121) is electrically connected to the terminal of one of at least two of the battery cell assemblies (110), and the second connection portion (122) is electrically connected to the terminal of the other of at least two of the battery cell assemblies (110).

3. The battery module (100) according to claim 2, characterized in that, The connecting piece (120) has a first installation state and a second installation state; When the connecting piece (120) is in the first installation state, there is an angle between the extension direction of the first connecting part (121) and the extension direction of the second connecting part (122); When the connecting piece (120) switches from the first installation state to the second installation state, the second connecting part (122) rotates relative to the first connecting part (121), and the extension direction of the first connecting part (121) is consistent with the extension direction of the second connecting part (122).

4. The battery module (100) according to claim 3, characterized in that, The connecting piece (120) also has a bending groove (124), which is located between the second connecting part (122) and the third connecting part (123); The bending groove (124) is configured to extend along the width direction of the connecting piece (120) so that the second connecting portion (122) rotates relative to the first connecting portion (121).

5. The battery module (100) according to claim 1, characterized in that, The battery module (100) also includes a liquid cooling plate (130) and an epoxy plate (140), wherein the liquid cooling plate (130) is located between two adjacent battery cell assemblies (110); The epoxy plate (140) is disposed between the liquid cooling plate (130) and the battery cell assembly (110).

6. The battery module (100) according to any one of claims 1-5, characterized in that, The battery cell assembly (110) includes a battery cell body, and the terminal is disposed on the battery cell body; The battery cell body includes a plurality of first sub-cells (111) and a plurality of second sub-cells (112), the first sub-cells (111) and the second sub-cells (112) are arranged along the thickness direction of the battery module (100), and the first sub-cells (111) are located above the second sub-cells (112); Multiple first sub-cells (111) and multiple second sub-cells (112) are spaced apart along a second direction; Wherein, one of the first direction and the second direction is the length direction of the battery module (100), and the other of the first direction and the second direction is the width direction of the battery module (100).

7. The battery module (100) according to claim 6, characterized in that, The battery cell assembly (110) further includes an electrical connector (113) connected between the battery cell body and the connecting piece (120); Along the second direction, the electrical connector (113) is located in the middle of the battery module (100).

8. The battery module (100) according to claim 7, characterized in that, The electrical connector (113) includes an electrode tray (1131) and an electrode connector (1132), wherein the electrode connector (1132) is disposed on the electrode tray (1131) and is electrically connected to the electrode post; The electrode tray (1131) is located between the electrode connector (1132) and the cell body.

9. The battery module (100) according to claim 6, characterized in that, At least one of the first sub-cell (111) and the second sub-cell (112) is a cylindrical cell.

10. A battery pack, characterized in that, Includes a housing and a battery module (100) as described in any one of claims 1 to 9; The battery module (100) is located inside the housing.

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