Battery module and energy storage equipment

Abstract

The invention discloses a battery module and energy storage equipment. The battery module comprises a plurality of battery cell components, a first conductive part and a second conductive part, each battery cell assembly comprises a plurality of battery cells arranged along a first direction, the plurality of battery cell assemblies are arranged along a second direction, the adjacent battery cell assemblies are connected, and the first direction is perpendicular to the second direction. The first conductive member is connected to the at least one battery cell. And the second conductive piece and the first conductive piece are connected with the battery cell of the same battery cell assembly. The second conductive part is connected to at least one battery cell, the polarity of the first conductive part is opposite to that of the second conductive part, and the first conductive part and the second conductive part are configured to input and / or output electric energy for the multiple battery cell assemblies. And along the direction opposite to the second direction, the first conductive piece and the second conductive piece are positioned on the same side of the plurality of battery cell components. And along the first direction, the battery cell connected to the second conductive piece and the battery cell connected to the first conductive piece are adjacently arranged.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery module and an energy storage device. Background Technology

[0002] Rechargeable battery cells are those that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Rechargeable battery cells are widely used in electronic devices and energy storage devices.

[0003] Battery modules typically consist of multiple cells to meet the voltage requirements of electronic devices. Multiple battery modules are usually used in groups, and simplifying the grouping structure of these modules has been a ongoing research focus in the industry. Summary of the Invention

[0004] This application provides a battery module and an energy storage device that can simplify the assembly structure of multiple battery modules.

[0005] In a first aspect, this application provides a battery module comprising multiple cell assemblies, a first conductive element, and a second conductive element. Each cell assembly includes multiple cells arranged along a first direction, and the multiple cell assemblies are arranged along a second direction, with adjacent cell assemblies connected. The first direction is perpendicular to the second direction. The first conductive element is connected to at least one cell. The second conductive element and the first conductive element are connected to cells within the same cell assembly. The second conductive element is connected to at least one cell, and the polarity of the first conductive element is opposite to that of the second conductive element. The first conductive element and the second conductive element serve as the positive and negative electrodes of the multiple cell assemblies, respectively. Along the second direction, the first conductive element and the second conductive element are located on the same side of the multiple cell assemblies. Along the first direction, the cell connected to the second conductive element and the cell connected to the first conductive element are arranged adjacent to each other.

[0006] When multiple battery modules are assembled into a group, adjacent battery modules can be connected by conductive connectors. The first and second conductive components of each battery module are arranged adjacent to each other, which shortens the distance between the first and second conductive components of adjacent battery modules, helps to reduce the size of the conductive connectors, and simplifies the structure after multiple battery modules are assembled.

[0007] In one or more of the above optional embodiments, the battery module includes a housing, the housing including a first sidewall and a second sidewall disposed along a first direction, and a plurality of cell assemblies disposed between the first sidewall and the second sidewall. A first conductive element is connected to the cell of a cell assembly closest to the second sidewall. The first conductive element is disposed near the end of the battery module along the first direction, which facilitates the connection of the first conductive element with other components (e.g., electrical modules).

[0008] In one or more of the above optional embodiments, the plurality of battery cell assemblies include a first battery cell assembly and a second battery cell assembly spaced apart along a second direction. A first conductive element is connected to the battery cell of the first battery cell assembly closest to the second sidewall. The battery cell of the first battery cell assembly closest to the second sidewall is connected in series with the battery cell of the second battery cell assembly closest to the second sidewall. The battery cell of the first battery cell assembly closest to the first sidewall is connected in series with the battery cell of the second battery cell assembly closest to the first sidewall. By connecting the battery cells of the first battery cell assembly and the battery cells of the second battery cell assembly in the above manner, the first conductive element and the second conductive element can be adjacent to each other.

[0009] In one or more of the above optional embodiments, each cell includes a cell body and a first electrode terminal and a second electrode terminal extending from the cell body. The first electrode terminal and the second electrode terminal are located on opposite sides of the cell body, and one of the first electrode terminal and the other of the second electrode terminal is a positive terminal and the other is a negative terminal.

[0010] In one or more of the above optional embodiments, the battery module includes multiple busbar assemblies, each busbar assembly including multiple first busbars, each first busbar connected to at least two battery cells. The multiple busbar assemblies include a first busbar assembly, a second busbar assembly, a third busbar assembly, and a fourth busbar assembly. The first and second busbar assemblies are located on opposite sides of the first battery cell assembly along a second direction and are connected to the first battery cell assembly. The third and fourth busbar assemblies are located on opposite sides of the second battery cell assembly along the second direction and are connected to the second battery cell assembly. The second busbar assembly is connected to the third busbar assembly. By providing four busbar assemblies, multiple battery cells of the first battery cell assembly and multiple battery cells of the second battery cell assembly can be connected, facilitating the charging and discharging of the battery cells.

[0011] In one or more of the above optional embodiments, the second bus assembly includes a second bus member, which is connected to the same battery cell as the first conductive member. The third bus assembly includes a third bus member, which is connected to the battery cell closest to the second sidewall in the second battery cell assembly. The battery module includes a first connector, which connects the second bus member and the third bus member.

[0012] The first connector can connect at least one cell of the first battery cell assembly and at least one cell of the second battery cell assembly through the second and third busbars, thereby forming a current loop between the first battery cell assembly and the second battery cell assembly.

[0013] In one or more of the above optional embodiments, the first connector includes a first connecting portion, a second connecting portion, and a third connecting portion connecting the first connecting portion and the second connecting portion. The first connecting portion and at least one first electrode terminal of the first battery cell assembly are stacked and connected, and the second connecting portion and at least one second electrode terminal of the second battery cell assembly are stacked and connected; or, the first connecting portion and at least one second electrode terminal of the first battery cell assembly are stacked and connected, and the second connecting portion and at least one first electrode terminal of the first battery cell assembly are stacked and connected.

[0014] The first connector can be directly connected to at least one cell of the first cell assembly and at least one cell of the second cell assembly, which can shorten the conductive path, reduce resistance, and improve overcurrent capability.

[0015] In one or more of the above optional embodiments, the second bus assembly includes a fourth bus, which is connected to the cell of the first cell assembly closest to the first sidewall. The fourth bus assembly includes a fifth bus, which is connected to the cell of the second cell assembly closest to the first sidewall. The battery module includes a second connector, which connects the fourth and fifth bus. The second connector can connect at least one cell of the first cell assembly and at least one cell of the second cell assembly through the fourth and fifth bus, thereby forming a current loop between the first and second cell assemblies.

[0016] In one or more of the above optional embodiments, the second connector includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion connecting the fourth connecting portion and the fifth connecting portion. In some embodiments, the fourth connecting portion and at least one first electrode terminal of the first battery cell assembly are stacked and connected, and the fifth connecting portion and at least one second electrode terminal of the second battery cell assembly are stacked and connected. In other embodiments, the fourth connecting portion and at least one second electrode terminal of the first battery cell assembly are stacked and connected, and the fifth connecting portion and at least one first electrode terminal of the first battery cell assembly are stacked and connected.

[0017] In one or more of the above optional embodiments, the first bus assembly includes a sixth bus and a seventh bus. The sixth bus connects at least two cells in parallel, and the seventh bus connects at least two cells in parallel. The sixth bus is connected to the first conductive element, and the seventh bus is connected to the second conductive element.

[0018] In one or more of the above optional embodiments, in each battery cell assembly, n adjacent cells are connected in parallel to form a cell unit; multiple cell units are connected in series, where n is a positive integer greater than 1. The multiple cells of the battery module form a multi-parallel-series structure.

[0019] In one or more of the above optional embodiments, n equals 3. Each battery cell assembly comprises a plurality of cells including a first cell, a second cell, a third cell, a fourth cell, a fifth cell, and a sixth cell arranged sequentially along a first direction. The first busbar includes a first welding region, a second welding region, and a third welding region arranged sequentially at intervals. The first welding region is welded to the first electrode terminal of the first cell; the second welding region is welded to the first electrode terminal of the second cell, the first electrode terminal of the third cell, the second electrode terminal of the fourth cell, and the second electrode terminal of the fifth cell; and the third welding region is welded to the second electrode terminal of the sixth cell.

[0020] The first busbar can connect at least six cells, which helps reduce the number of first busbars, reduce the space and weight occupied by the first busbar, increase energy density, and reduce costs. Welding the first electrode terminals of three cells and the second electrode terminals of three cells to the first welding area, the second welding area, and the third welding area of ​​the first busbar can reduce the power of a single welding operation, reduce welding heat generation, and reduce welding difficulty.

[0021] In one or more of the above optional embodiments, the first busbar includes a first flat portion, a first bent portion, a second flat portion, a second bent portion and a third flat portion, the first bent portion connects the first flat portion and the second flat portion, and the second bent portion connects the second flat portion and the third flat portion.

[0022] Along the second direction, the first flat portion is closer to the cell body than the second flat portion, and the second flat portion is closer to the cell body than the third flat portion. The first welding area is located on the first flat portion, the second welding area is located on the second flat portion, and the third welding area is located on the third flat portion.

[0023] In one or more of the above optional embodiments, the second conductive element is connected to the second electrode terminals of three cells in the first cell assembly, and the first conductive element is connected to the first electrode terminals of the three cells in the first cell assembly, and the six cells are arranged sequentially along the first direction. Alternatively, the first conductive element is connected to the second electrode terminals of three cells in the first cell assembly, and the second conductive element is connected to the first electrode terminals of the three cells in the first cell assembly, and the six cells are arranged sequentially along the first direction.

[0024] In one or more of the above optional embodiments, each bus assembly includes an insulator and a sampling element; a first bus is connected to the insulator. The insulator has multiple openings; the first bus has a welding area that is welded to a first electrode terminal and / or a second electrode terminal, and viewed along a second direction, the welding area is located within the openings. A portion of the sampling element is disposed on the side of the insulator away from the cell body, and the sampling element is connected to at least one first bus.

[0025] Open-ended welding simplifies the welding process and reduces the risk of metal particles adhering to the battery cell. Insulators, sampling components, and multiple first busbars can be integrated together before assembly with the battery cell assembly, simplifying the assembly process. Insulators support and secure the first busbars and sampling components, reducing the risk of displacement when the battery module is subjected to external forces, thus improving the stability of current collection and sampling. Insulators can cover the first and second electrode terminals along a second direction, improving insulation performance.

[0026] In one or more of the above alternative embodiments, the insulating element includes a thermoformed sheet. The thermoformed sheet is lightweight and compact, which helps to improve the energy density of the battery module.

[0027] In one or more of the above optional embodiments, the first conductive element includes a first conductive portion and a second conductive portion. The first conductive portion is connected to the battery cell, and the second conductive portion is configured to connect to an external device. The battery module includes an insulating support, and the second conductive portion is fixed to the insulating support and exposed in the insulating support, which facilitates the connection of the second conductive portion to the external device.

[0028] In one or more of the above optional embodiments, the first conductive element includes two second conductive portions, which are respectively connected to the two ends of the first conductive portion in a third direction.

[0029] In one or more of the above optional embodiments, the second conductive element includes a third conductive portion and a fourth conductive portion. The third conductive portion is connected to the battery cell, and the fourth conductive portion is configured to connect to an external device. The fourth conductive portion is fixed to an insulating support and exposed on the insulating support, which facilitates the connection between the fourth conductive portion and the external device.

[0030] In one or more of the above optional embodiments, the second conductive element includes two fourth conductive portions, which are respectively connected to the two ends of the third conductive portion in a third direction.

[0031] Secondly, embodiments of this application provide an energy storage device comprising multiple battery modules as provided in any of the embodiments of the first aspect. The multiple battery modules are arranged along a third direction, with the first direction, second direction, and third direction being perpendicular to each other. First conductive elements of the multiple battery modules are arranged along the third direction, and second conductive elements of the multiple battery modules are arranged along the third direction. The energy storage device includes multiple conductive connectors, each conductive connector connecting to an adjacent battery module. In two adjacent battery modules, the conductive connector is connected to the first conductive element of one battery module, and the conductive connector is connected to either the first conductive element or the second conductive element of the other battery module. In two adjacent battery modules, the first and second conductive elements of each battery module are arranged adjacent to each other, which can shorten the distance between the first or second conductive elements of adjacent battery modules, helping to reduce the size of the conductive connectors and simplify the structure of the energy storage device.

[0032] In one or more of the above alternative embodiments, the energy storage device includes an electrical module. The electrical module may be connected to the battery module. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly described below.

[0034] Figure 1 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0035] Figure 2 This is an exploded view of a battery module provided in some embodiments of this application;

[0036] Figure 3 A schematic diagram of a battery module provided in some embodiments of this application, viewed in a direction opposite to that of a third party;

[0037] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0038] Figure 5 for Figure 3 An enlarged view of box A;

[0039] Figure 6 for Figure 3 Enlarged view at box B;

[0040] Figure 7 This is a simplified schematic diagram of a battery module provided in some embodiments of this application;

[0041] Figure 8 This is a schematic diagram of the structure of a first or second connector provided in some embodiments of this application;

[0042] Figure 9 for Figure 3 Enlarged view at box C;

[0043] Figure 10 A schematic diagram of a first busbar, a plurality of first electrode terminals, and a plurality of second electrode terminals provided in some embodiments of this application;

[0044] Figure 11 for Figure 10 Enlarged illustration within the box;

[0045] Figure 12 A schematic diagram of the structure of a first busbar provided in some embodiments of this application;

[0046] Figure 13 for Figure 1 Enlarged view of the area within the circle;

[0047] Figure 14 A schematic diagram of the first bus component structure provided in some embodiments of this application;

[0048] Figure 15 for Figure 14 An explosion diagram;

[0049] Figure 16 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application;

[0050] Figure 17 for Figure 16 Enlarged view of the area within the circle.

[0051] The annotations in the attached figures are explained as follows:

[0052]

[0053] Detailed Implementation

[0054] 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 described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0055] The terms "first," "second," "third," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0056] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0059] The battery module and energy storage device of this application are described below with reference to the accompanying drawings.

[0060] Reference Figures 1 to 15 The battery module 1000 of this application embodiment includes a plurality of battery cell assemblies 1, each battery cell assembly 1 including a plurality of battery cells 11 arranged along a first direction X, the plurality of battery cell assemblies 1 arranged along a second direction Y, adjacent battery cell assemblies 1 are connected, and the first direction X is perpendicular to the second direction Y.

[0061] Cell 11 can be a lithium-ion cell, sodium-lithium-ion cell, sodium-ion cell, magnesium-ion cell, or other types of cell. The cell can be a hard-shell cell or a soft-pack cell. The cell can be a prismatic cell, a cylindrical cell, or other irregularly shaped cell.

[0062] In some embodiments, each cell 11 includes a cell body 111 and a first electrode terminal 112 and a second electrode terminal 113 extending from the cell body 111. The first electrode terminal 112 and the second electrode terminal 113 are located on opposite sides of the cell body 111. One of the first electrode terminal 112 and the second electrode terminal 113 is a positive terminal and the other is a negative terminal.

[0063] In some embodiments, the cell body 111 includes a cell housing and an electrode assembly (not shown), the electrode assembly being housed within the cell housing, and a first electrode terminal 112 being connected to the electrode assembly and led out from the cell housing.

[0064] The electrode assembly includes a positive electrode, a negative electrode, and a separator. The battery cell 11 mainly relies on the movement of metal ions between the positive and negative electrode to operate.

[0065] One of the first electrode terminal 112 and the second electrode terminal 113 is connected to the positive electrode plate, and the other is connected to the negative electrode plate.

[0066] One end of the first electrode terminal 112 extends out of the cell housing and is used for electrical connection with an external circuit. The other end of the first electrode terminal 112 extends into the cell housing and is used for connection with the positive electrode (or negative electrode). One end of the second electrode terminal 113 extends out of the cell housing and is used for electrical connection with an external circuit. The other end of the second electrode terminal 113 extends into the cell housing and is used for connection with the negative electrode (or positive electrode).

[0067] The first electrode terminal 112 and the second electrode terminal 113 are used to electrically connect the electrode assembly to an external circuit to enable the charging and discharging of the battery cell 11.

[0068] In some embodiments, one of the first electrode terminal 112 and the second electrode terminal 113 extends from one end of the cell body 111 along the second direction Y, and the other extends from the other end of the cell body 111 along the second direction Y.

[0069] In some embodiments, cell 11 is a pouch cell. The cell casing is made of aluminum-plastic film or steel-plastic film.

[0070] In some embodiments, please refer to Figure 4 , Figure 4 The diagram shows the first electrode terminal 112 and the second electrode terminal 113 without bending. Along the second direction Y, the length of both the first electrode terminal 112 and the second electrode terminal 113 outside the cell body 111 is L, and the lengths of the first electrode terminal 112 and the second electrode terminal 113 outside the cell body 111 are equal for each cell. "Equal" includes not only absolute equality but also approximately equality as commonly understood in engineering. For example, equality includes a difference of 0-10%.

[0071] The first electrode terminal 112 and the second electrode terminal 113 are of the same length, which can reduce the cutting process of the first electrode terminal 112 and the second electrode terminal 113, simplifying the manufacturing process of the battery cell 11 and the grouping process of multiple battery cells 11.

[0072] In some embodiments, the cell housing is made of aluminum-plastic film or steel-plastic film.

[0073] In some embodiments, the multiple cells 11 of the battery module 1000 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that the multiple cells 11 are connected in both series and parallel.

[0074] In some embodiments, the battery module 1000 includes a first conductive element 8 and a second conductive element 9. The first conductive element 8 is connected to at least one battery cell 11. The second conductive element 9 and the first conductive element 8 are connected to the same battery cell assembly 1. The second conductive element 9 is connected to at least one battery cell 11. The polarity of the first conductive element 8 and the second conductive element 9 are opposite. The first conductive element 8 and the second conductive element 9 serve as the positive and negative terminals of the multiple battery cell assemblies 1, for example, the first conductive element 8 is the positive terminal of the multiple battery cell assemblies 1 and the second conductive element 9 is the negative terminal of the multiple battery cell assemblies 1, or the first conductive element 8 is the negative terminal of the multiple battery cell assemblies 1 and the second conductive element 9 is the positive terminal of the multiple battery cell assemblies 1. The first conductive element 8 and the second conductive element 9 are connected to external devices.

[0075] The first conductive element 8 and the second conductive element 9 are connected to different battery cells 11.

[0076] In some examples, a first conductive element 8 is connected to the positive terminal of at least one cell 11, and a second conductive element 9 is connected to the negative terminal of at least one cell 11. Alternatively, the first conductive element 8 is connected to the negative terminal of at least one cell 11, and the second conductive element 9 is connected to the positive terminal of at least one cell 11.

[0077] In some examples, the first conductive element 8 may be connected to multiple cells 11, for example, three cells 11.

[0078] In some examples, the second conductive element 9 may be connected to multiple cells 11, for example, three cells 11.

[0079] In some embodiments, along the second direction Y, the first conductive element 8 and the second conductive element 9 are located on the same side of the plurality of cell assemblies 1; along the first direction X, the cell 11 connected to the second conductive element 9 and the cell 11 connected to the first conductive element 8 are arranged adjacent to each other.

[0080] When multiple battery modules 1000 are assembled into a group, adjacent battery modules 1000 can be connected by conductive connectors. The first conductive element 8 and the second conductive element 9 of each battery module 1000 are arranged adjacently, which can shorten the distance between the first conductive element 8 and the second conductive element 9 of adjacent battery modules 1000, help to reduce the size of the conductive connectors, and simplify the structure after multiple battery modules 1000 are assembled.

[0081] In some embodiments, the battery module 1000 includes a housing 6, which can be a square, cylindrical, or other shaped housing. The housing 6 can be a metal housing, a plastic housing, a metal-plastic composite housing, or a housing made of other materials. The housing 6 can be a one-piece molded housing or can be assembled from multiple independently molded components.

[0082] In some embodiments, the housing 6 includes a first sidewall 61 and a second sidewall 62 disposed along a first direction X, and a plurality of battery cell assemblies 1 are disposed between the first sidewall 61 and the second sidewall 62.

[0083] In some embodiments, the housing 6 includes a fastener 63, which connects the first sidewall 61 and the second sidewall 62.

[0084] In some embodiments, there are multiple fasteners 63. These multiple fasteners are arranged along the second direction Y.

[0085] In some embodiments, the first conductive element 8 is connected to the cell 11 of a cell assembly 1 closest to the second sidewall 62. The first conductive element 8 is disposed near the end of the battery module 1000 along the first direction X, which facilitates the connection of the first conductive element 8 with other components (e.g., electrical modules or battery modules).

[0086] In some embodiments, the plurality of cell assemblies 1 include a first cell assembly 1a and a second cell assembly 1b disposed at intervals along a second direction Y.

[0087] The first battery cell assembly 1a includes a plurality of battery cells 11 arranged along a first direction X, and the second battery cell assembly 1b includes a plurality of battery cells 11 arranged along the first direction X. Optionally, the number of battery cells 11 in the first battery cell assembly 1a is equal to the number of battery cells 11 in the second battery cell assembly 1b.

[0088] In some embodiments, the first conductive element 8 is connected to the cell 11 of the first cell assembly 1a that is closest to the second sidewall 62. The cell 11 of the first cell assembly 1a that is closest to the second sidewall 62 is connected in series with the cell 11 of the second cell assembly 1b that is closest to the second sidewall 62. The cell 11 of the first cell assembly 1a that is closest to the first sidewall 61 is connected in series with the cell 11 of the second cell assembly 1b that is closest to the first sidewall 61.

[0089] By connecting the battery cells 11 of the first battery cell assembly 1a and the second battery cell assembly 1b in the above manner, the first conductive element 8 and the second conductive element 9 can be made adjacent to each other.

[0090] In some embodiments, a first cell assembly 1a is disposed between a first sidewall 61 and a second sidewall 62, and a second cell assembly 1b is disposed between the first sidewall 61 and the second sidewall 62.

[0091] In some embodiments, the battery module 1000 includes a plurality of busbar components 2, each busbar component 2 including a plurality of first busbars 22, each first busbar 22 being connected to at least two battery cells 11.

[0092] For example, a plurality of first busbars 22 are spaced apart along a first direction X.

[0093] For example, the first busbar 22 is connected to the first electrode terminal 112 and the second electrode terminal 113 of at least one battery cell 11. The first busbar 22 and the first electrode terminal 112 are connected by laser welding, and the first busbar 22 and the second electrode terminal 113 are connected by laser welding.

[0094] Multiple busbar components 2 connect multiple battery cells 11 of battery cell components 1 in series, parallel or mixed.

[0095] In some embodiments, the plurality of bus components 2 include a first bus component 2a, a second bus component 2b, a third bus component 2c, and a fourth bus component 2d. The first bus component 2a and the second bus component 2b are respectively located on both sides of the first battery cell assembly 1a along the second direction Y and are connected to the first battery cell assembly 1a. The third bus component 2c and the fourth bus component 2d are respectively located on both sides of the second battery cell assembly 1b along the second direction Y and are connected to the second battery cell assembly 1b. The second bus component 2b is connected to the third bus component 2c.

[0096] By setting up four busbar components 2, multiple cells 11 of the first cell assembly 1a and multiple cells 11 of the second cell assembly 1b can be connected, which helps to realize the charging and discharging of the cells 11.

[0097] In some embodiments, in each battery cell assembly 1, n adjacent cells 11 are connected in parallel to form a battery cell unit 11U. Multiple battery cell units 11U are connected in series, where n is a positive integer greater than 1. In this embodiment, the multiple cells 11 of the battery module 1000 form a multi-parallel-series structure.

[0098] As an example, n can be 2, 3, 4, or 5.

[0099] In some embodiments, n is 3. The first conductive element 8 is connected to the three battery cells 11, and the second conductive element 9 is connected to the three battery cells 11.

[0100] Reference Figure 2 as well as Figures 9 to 13 In some embodiments, n is 3, and each battery cell assembly 1 includes a first battery cell 11a, a second battery cell 11b, a third battery cell 11c, a fourth battery cell 11d, a fifth battery cell 11e, and a sixth battery cell 11f arranged sequentially along a first direction X.

[0101] The first busbar 22 includes a first welding area W1, a second welding area W2, and a third welding area W3 arranged sequentially at intervals. The first welding area W1 is welded to the first electrode terminal 112 of the first battery cell 11a. The second welding area W2 is welded to the first electrode terminal 112 of the second battery cell 11b, the first electrode terminal 112 of the third battery cell 11c, the second electrode terminal 113 of the fourth battery cell 11d, and the second electrode terminal 113 of the fifth battery cell 11e. The third welding area W3 is welded to the second electrode terminal 113 of the sixth battery cell 11f.

[0102] The first busbar 22 connects six battery cells 11, which helps reduce the number of first busbars 22, reduce the space and weight occupied by the first busbar 22, increase energy density, and reduce costs. Welding the first electrode terminals 112 and the second electrode terminals 113 of the three battery cells 11 to the first welding area W1, the second welding area W2, and the third welding area W3 of the first busbar 22 can reduce the power of a single welding operation, reduce welding heat generation, and reduce welding difficulty.

[0103] The first busbar 22 connects the first battery cell 11a, the second battery cell 11b and the third battery cell 11c in parallel, and connects the fourth battery cell 11d, the fifth battery cell 11e and the sixth battery cell 11f in parallel.

[0104] The first battery cell 11a, the second battery cell 11b, and the third battery cell 11c constitute a battery cell unit 11U, and the fourth battery cell 11d, the fifth battery cell 11e, and the sixth battery cell 11f constitute another battery cell unit 11U. The first busbar 22 connects the two battery cell units 11U in series.

[0105] In some embodiments, the first busbar 22 includes a first flat portion 221, a first bent portion 224, a second flat portion 222, a second bent portion 225, and a third flat portion 223. The first bent portion 224 connects the first flat portion 221 and the second flat portion 222, and the second bent portion 225 connects the second flat portion 222 and the third flat portion 223.

[0106] Along the second direction Y, the first flat portion 221 is closer to the cell body 111 than the second flat portion 222, and the second flat portion 222 is closer to the cell body 111 than the third flat portion 223. The first welding area W1 is located on the first flat portion 221, the second welding area W2 is located on the second flat portion 222, and the third welding area W3 is located on the third flat portion 223.

[0107] In some embodiments, the second bus assembly 2b includes a second bus 5a, and the second bus 5a and the first conductive element 8 are connected to the same battery cell 11.

[0108] As an example, the second bus 5a is connected to the first electrode terminal 112 of the battery cell 11, and the first conductive element 8 is connected to the second electrode terminal 113 of the battery cell 11. Alternatively, the second bus 5a is connected to the second electrode terminal 113 of the battery cell 11, and the first conductive element 8 is connected to the first electrode terminal 112 of the battery cell 11.

[0109] As an example, the second busbar 5a and the first conductive element 8 are connected to the same three battery cells 11. The first electrode terminal 112 of the three battery cells 11 is connected to one of the second busbar 5a and the first conductive element 8, and the second electrode terminal 113 of the three battery cells 11 is connected to the other of the second busbar 5a and the first conductive element 8.

[0110] In some embodiments, the second busbar 5a is laser-welded to the first electrode terminal 112 of the battery cell 11, or the second busbar 5a is laser-welded to the second electrode terminal 113 of the battery cell 11.

[0111] In some embodiments, the third bus assembly 2c includes a third bus 5b, which is connected to the cell 11 in the second cell assembly 1b that is closest to the second sidewall 62. The battery module 1000 includes a first connector 3, which connects the second bus 5a and the third bus 5b.

[0112] The first connector 3 can connect at least one cell 11 of the first cell assembly 1a and at least one cell 11 of the second cell assembly 1b through the second busbar 5a and the third busbar 5b, thereby forming a current loop between the first cell assembly 1a and the second cell assembly 1b.

[0113] As an example, the first connector 3 can connect the cell 11 closest to the second sidewall 62 of the first cell assembly 1a and the cell 11 closest to the second sidewall 62 of the second cell assembly 1b in series through the second busbar 5a and the third busbar 5b.

[0114] As an example, the first connector 3 may be a wire harness, a conductive sheet, or other conductive structure. Optionally, the first connector 3 may include a flexible wire harness.

[0115] In some embodiments, the third bus 5b is laser-welded to the first electrode terminal 112 of the battery cell 11, or the third bus 5b is laser-welded to the second electrode terminal 113 of the battery cell 11.

[0116] In some embodiments, the first connector 3 includes a first connecting portion 31, a second connecting portion 32, and a third connecting portion 33 connecting the first connecting portion 31 and the second connecting portion 32.

[0117] In some embodiments, the first connection portion 31 and at least one first electrode terminal 112 of the first cell assembly 1a are stacked and connected, and the second connection portion 32 and at least one second electrode terminal 113 of the second cell assembly 1b are stacked and connected. In other embodiments, the first connection portion 31 and at least one second electrode terminal 113 of the first cell assembly 1a are stacked and connected, and the second connection portion 32 and at least one first electrode terminal 112 of the first cell assembly 1a are stacked and connected.

[0118] The first connector 3 can be directly connected to at least one cell 11 of the first cell assembly 1a and at least one cell 11 of the second cell assembly 1b, which can shorten the conductive path, reduce resistance, and improve overcurrent capability.

[0119] In some embodiments, along the second direction Y, a portion of the first connecting portion 31, at least one first electrode terminal 112 of the first cell assembly 1a, and the second busbar 5a are sequentially stacked and connected; a third busbar 5b, at least one second electrode terminal 113 of the second cell assembly 1b, and a portion of the second connecting portion 32 are sequentially stacked and connected.

[0120] In some embodiments, the first connecting part 31 and the second connecting part 32 are both metal plates, and the third connecting part 33 is a flexible wire harness.

[0121] In some embodiments, the first connecting portion 31 is welded to the first battery cell assembly 1a, and the second connecting portion 32 is welded to the second battery cell assembly 1b. The first battery cell assembly 1a and the second battery cell assembly 1b are arranged along the second direction Y, and then the third connecting portion 33 is welded to the first connecting portion 31 and the second connecting portion 32 respectively, which is beneficial for manufacturing.

[0122] In some embodiments, the second bus assembly 2b includes a fourth bus 5c, which is connected to the cell of the first cell assembly 1a closest to the first sidewall 61. The fourth bus assembly 2d includes a fifth bus 5d, which is connected to the cell of the second cell assembly 1b closest to the first sidewall 61. The battery module 1000 includes a second connector 4, which connects the fourth bus 5c and the fifth bus 5d.

[0123] The second connector 4 can connect at least one cell 11 of the first cell assembly 1a and at least one cell 11 of the second cell assembly 1b through the fourth bus 5c and the fifth bus 5d, thereby forming a current loop between the first cell assembly 1a and the second cell assembly 1b.

[0124] As an example, the second connector 4 connects the fourth bus 5c and the fifth bus 5d so that the cell 11 closest to the first sidewall 61 of the first cell assembly 1a is connected in series with the cell 11 closest to the first sidewall 61 of the second cell assembly 1b.

[0125] In some embodiments, a fourth bus 5c is connected to the first electrode terminal 112 of at least one cell 11 of the first cell assembly 1a, and a fifth bus 5d is connected to the second electrode terminal 113 of at least one cell 11 of the second cell assembly 1b, so as to connect at least one cell 11 of the first cell assembly 1a and at least one cell 11 of the second cell assembly 1b in series.

[0126] In other embodiments, a fourth bus 5c is connected to the second electrode terminal 113 of at least one cell 11 of the first cell assembly 1a, and a fifth bus 5d is connected to the first electrode terminal 112 of at least one cell 11 of the second cell assembly 1b, so as to connect at least one cell 11 of the first cell assembly 1a and at least one cell 11 of the second cell assembly 1b in series.

[0127] In some embodiments, the second connector 4 includes a fourth connector 41, a fifth connector 42, and a sixth connector 43 connecting the fourth connector 41 and the fifth connector 42.

[0128] In some embodiments, the fourth connection portion 41 is stacked with at least one first electrode terminal 112 of the first cell assembly 1a, and the fifth connection portion 42 is stacked with at least one second electrode terminal 113 of the second cell assembly 1b. In other embodiments, the fourth connection portion 41 is stacked with at least one second electrode terminal 113 of the first cell assembly 1a, and the fifth connection portion 42 is stacked with at least one first electrode terminal 112 of the first cell assembly 1a.

[0129] In some embodiments, along the second direction Y, a portion of the fourth connection portion 41, at least one first electrode terminal 112 of the first cell assembly 1a, and the fourth busbar 5c are sequentially stacked and connected; a fifth busbar 5d, at least one second electrode terminal 113 of the second cell assembly 1b, and a portion of the fifth connection portion 42 are sequentially stacked and connected.

[0130] In some embodiments, the second connector 4 and the first connector 3 have the same structure.

[0131] By setting the first connector 3 and the second connector 4, the second bus assembly 2b and the third bus assembly 2c are connected, and the multiple cells 11 of the first cell assembly 1a and the multiple cells 11 of the second cell assembly 1b are connected into a group, which helps the first conductive element 8 and the second conductive element 9 to be adjacent.

[0132] In some embodiments, the first bus assembly 2a includes a sixth bus 5e and a seventh bus 5f. The sixth bus 5e connects at least two battery cells 11 in parallel, and the seventh bus 5f connects at least two battery cells 11 in parallel.

[0133] One of the sixth busbar 5e and the seventh busbar 5f is connected to the positive terminal of the first cell assembly 1a, and the other is connected to the negative terminal of the first cell assembly 1a. Taking the first electrode terminal 112 as the positive terminal and the second electrode terminal 113 as the negative terminal as an example, the three first electrode terminals 112 of the first cell assembly 1a are connected to form the positive terminal of the first cell assembly 1a, and the three second electrode terminals 113 of the first cell assembly 1a are connected to form the negative terminal of the first cell assembly 1a. In this application, the positive terminal of the first cell assembly 1a is the positive terminal of a plurality of cell assemblies 1, and the negative terminal of the first cell assembly 1a is the negative terminal of a plurality of cell assemblies 1.

[0134] In some embodiments, the sixth bus 5e is connected to the first conductive element 8, and the seventh bus 5f is connected to the second conductive element 9.

[0135] In some embodiments, the sixth bus 5e is connected to the first electrode terminal 112 of the three battery cells 11, and the seventh bus 5f is connected to the second electrode terminal 113 of the three battery cells 11. Alternatively, the sixth bus 5e is connected to the second electrode terminal 113 of the three battery cells 11, and the seventh bus 5f is connected to the first electrode terminal 112 of the three battery cells 11.

[0136] In some embodiments, the second conductive element 9 is connected to the second electrode terminals 113 of the three cells 11 in the first cell assembly 1a, and the first conductive element 8 is connected to the first electrode terminals 112 of the three cells 11 in the first cell assembly 1a. The six cells 11 are arranged sequentially along the first direction X. In other embodiments, the first conductive element 8 is connected to the second electrode terminals 113 of the three cells 11 in the first cell assembly 1a, and the second conductive element 9 is connected to the first electrode terminals 112 of the three cells 11 in the first cell assembly 1a. The six cells 11 are arranged sequentially along the first direction X.

[0137] In some embodiments, each bus assembly 2 includes an insulator 21. A first bus assembly 22 is connected to the insulator 21.

[0138] The insulating component 21 has a plurality of openings 211 arranged along the first direction X. The first busbar 22 has a welding area W, which is welded to the first electrode terminal 112 and / or the second electrode terminal 113. Viewed along the second direction Y, the welding area W is located within the openings 211. Welding through the openings 211 simplifies the welding process and reduces the risk of metal particles generated during welding adhering to the cell 11.

[0139] In some embodiments, the welding area W is laser welded to the first electrode terminal 112 and / or the second electrode terminal 113.

[0140] In some embodiments, the shapes of the plurality of openings 211 may be the same or different. The dimensions of the plurality of openings 211 along the first direction X may be the same or different.

[0141] The number of openings 211 can be the same as or different from the number of the first busbar 22.

[0142] In some examples, the number of openings 211 is the same as the number of first busbars 22, and multiple openings 211 are arranged in a one-to-one correspondence with multiple first busbars 22, which helps to simplify the assembly process of the first busbars 22 and the insulator 21. One opening 211 corresponds to one first busbar 22. Viewed along the second direction Y, at least a portion of a first busbar 22 is located within one opening 211.

[0143] In some other examples, the number of openings 211 is less than the number of first busbars 22, and one opening 211 can expose multiple first busbars 22. In still other examples, the number of openings 211 is less than the number of first busbars 22, and one opening 211 can expose at least two first busbars 22. In yet another example, the number of openings 211 is more than the number of first busbars 22, and multiple openings 211 expose different portions of a first busbar 22.

[0144] The first busbar 22 can be fixed to the insulating component 21 by bonding, snap-fitting, heat fusion connection or other means.

[0145] In some embodiments, in the first bus assembly 2a, a portion of each first bus 22 is opposite to an opening 211 in a direction opposite to the second direction Y; the opening 211 is located on the side of the first bus 22 away from the cell body 111, which facilitates the welding of the first bus 22 and the first electrode terminal 112.

[0146] In some embodiments, each busbar assembly 2 includes a sampling element 23, a portion of which is disposed on the side of the insulator 21 away from the cell body 111, and the sampling element 23 is connected to at least one first busbar assembly 22.

[0147] The sampling element 23 is configured to transmit electrical signals of the cell assembly 1. Exemplarily, the electrical signals may include at least one of a voltage signal, a current signal, and a temperature signal.

[0148] In each busbar component 2, the sampling element 23 can be connected to a portion of the plurality of first busbar components 22, or it can be connected to each of the first busbar components 22.

[0149] The insulating component 21, the sampling component 23, and multiple first busbars 22 can be integrated together before being assembled with the battery cell assembly 1, which helps simplify the assembly process. The insulating component 21 can support and fix the first busbars 22 and the sampling component 23, reducing the risk of displacement of the first busbars 22 and the sampling component 23 when the battery module 1000 is subjected to external forces, and improving the stability of current collection and sampling. The insulating component 21 can cover the first electrode terminal 112 and the second electrode terminal 113 along the second direction Y, improving the insulation effect.

[0150] In some embodiments, the insulating element 21 comprises a thermoformed sheet. The thermoformed sheet is lightweight and compact, which helps to increase the energy density of the battery module 1000.

[0151] As an example, a flat rigid plastic sheet can be heated to soften it, then vacuum-adsorbed onto the surface of a mold, and after cooling, it can be molded to form an insulating part 21.

[0152] In some embodiments, the materials of the thermoforming sheet include, but are not limited to, PVC (Polyvinyl chloride), PET (Polyethylene Terephthalate), PS (Polystyrene), or PP (Polypropylene).

[0153] In some embodiments, the thickness of the insulating element 21 is 0.14mm-8.0mm. Exemplarily, the thickness of the insulating element 21 is 0.14mm, 0.2mm, 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5mm.

[0154] In some embodiments, the insulating member 21 is connected to the first sidewall 61 and the second sidewall 62, which helps to fix the insulating member 21 and improve the stability of the insulating member 21, the first busbar 22 and the sampling member 23.

[0155] As an example, one end of the insulating member 21 may be connected to the first sidewall 61 by adhesive bonding, snap-fitting, heat fusion connection or other means, and the other end of the insulating member 21 may be connected to the second sidewall 62 by adhesive bonding, snap-fitting, heat fusion connection or other means.

[0156] In some embodiments, in each busbar assembly 2, a plurality of openings 211 are provided in a one-to-one correspondence with a plurality of first busbars 22, which helps to simplify the assembly process of the first busbars 22 and the insulators 21.

[0157] In some embodiments, in each busbar assembly 2, the first busbar 22 is located on the side of the opening 211 facing the cell assembly 1.

[0158] In some embodiments, the sampling element 23 includes a sampling body 231 and a plurality of sampling parts 232, the plurality of sampling parts 232 being disposed at intervals along a first direction X on the sampling body 231.

[0159] The sampling body 231 is located on the side of the insulating member 21 away from the battery cell body 111, and the sampling part 232 passes through the opening 211 and is connected to the first busbar 22.

[0160] For example, the sampling unit 232 can collect information about the battery cell 11, such as current, voltage, and temperature, through the first bus 22.

[0161] In some embodiments, a plurality of sampling units 232 are provided in a one-to-one correspondence with a plurality of first busbars 22.

[0162] In some embodiments, the first busbar 22 is thermally fused to the surface of the insulating member 21 facing the cell body 111.

[0163] In some embodiments, the welding area W includes a first welding area W1, a second welding area W2, and a third welding area W3. Viewed along the second direction Y, the first welding area W1, the second welding area W2, and the third welding area W3 are all located within the opening 211. The opening 211 exposes the first welding area W1, the second welding area W2, and the third welding area W3, reducing the risk that the insulating component 21 will interfere with the welding of the first busbar 22 and the first electrode terminal 112, and reducing the risk that the insulating component 21 will interfere with the welding of the first busbar 22 and the second electrode terminal 113.

[0164] In some embodiments, the first conductive element 8 includes a first conductive portion 81 and a second conductive portion 82, the first conductive portion 81 being connected to the battery cell 11, and the second conductive portion 82 being configured to be connected to an external device.

[0165] The second conductive part 82 can be one or more.

[0166] In some embodiments, the first conductive portion 81 is stacked and connected to the first electrode terminal 112 of at least one battery cell 11, or the first conductive portion 81 is stacked and connected to the second electrode terminal 113 of at least one battery cell 11.

[0167] In some embodiments, the first conductive element 8 includes two second conductive portions 82, which are respectively connected to the two ends of the first conductive portion 81 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0168] In some embodiments, the battery module 1000 includes an insulating bracket 10a, to which a second conductive portion 82 is fixed. The second conductive portion 82 is exposed on the insulating bracket 10a, which facilitates the connection of the second conductive portion 82 to an external device.

[0169] In some embodiments, there are two insulating supports 10a, which are spaced apart along the third direction Z.

[0170] For example, the two second conductive parts 82 are respectively fixed to the two insulating supports 10a.

[0171] In some embodiments, the second conductive element 9 includes a third conductive portion 91 and a fourth conductive portion 92, wherein the third conductive portion 91 is connected to the battery cell 11 and the fourth conductive portion 92 is configured to be connected to an external device.

[0172] In some embodiments, the fourth conductive part 92 is fixed to the insulating bracket 10a and exposed in the insulating bracket 10a, which helps to connect the fourth conductive part 92 to an external device.

[0173] In some embodiments, the third conductive portion 91 is stacked and connected to the first electrode terminal 112 of at least one battery cell 11, or the third conductive portion 91 is stacked and connected to the second electrode terminal 113 of at least one battery cell 11.

[0174] In some embodiments, the second conductive element 9 includes two fourth conductive portions 92, which are respectively connected to the two ends of the third conductive portion 91 along the third direction Z.

[0175] In the first direction X, two second conductive parts 82 are respectively spaced apart from two fourth conductive parts 92.

[0176] Both second conductive parts 82 are used for connection with conductive connectors, and both fourth conductive parts 92 can be used for connection with conductive connectors. By providing two second conductive parts 82 and two fourth conductive parts 92, the arrangement of conductive connectors can be more flexible, which helps to reduce the size of conductive connectors.

[0177] In some embodiments, the two fourth conductive parts 92 are respectively fixed to the two insulating brackets 10a. The insulating brackets 10a can fix the first conductive element 8 and the second conductive element 9, and can also increase the creepage distance and improve the insulation effect.

[0178] Reference Figure 16 and Figure 17 This application provides an energy storage device 3000, which includes a plurality of battery modules 1000 provided in any of the foregoing embodiments.

[0179] The 3000 energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, etc.

[0180] In some embodiments, a plurality of battery modules 1000 are arranged along a third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first conductive elements 8 of the plurality of battery modules 1000 are arranged along the third direction Z, and the second conductive elements 9 of the plurality of battery modules 1000 are arranged along the third direction Z.

[0181] The energy storage device 3000 includes multiple conductive connectors 2000, each of which is connected to an adjacent battery module 1000.

[0182] The conductive connector 2000 connects multiple battery modules 1000 in series, parallel, or mixed connections.

[0183] In two adjacent battery modules 1000, the conductive connector 2000 is connected to the first conductive element 8 of one battery module 1000, and the conductive connector 2000 is connected to the first conductive element 8 or the second conductive element 9 of the other battery module 1000.

[0184] In two adjacent battery modules 1000, the first conductive element 8 and the second conductive element 9 of each battery module 1000 are arranged adjacent to each other, which can shorten the distance between the first conductive element 8 or the second conductive element 9 of the adjacent battery modules 1000, help reduce the size of the conductive connector 2000, and simplify the structure of the energy storage device 3000.

[0185] In some embodiments, the energy storage device 3000 includes an electrical module 4000. The electrical module 4000 may be connected to the battery module 1000.

[0186] As an example, the electrical module 4000 can be connected to an external power source to charge the battery module; the electrical module 4000 can also be connected to a load to provide power to the load.

[0187] As an example, the electrical module 4000 can also monitor the electrical parameters of the battery module 1000, such as current, voltage, and temperature, so that the energy storage device 3000 can operate within a safe range.

[0188] In some embodiments, the electrical module 4000 may be located below a plurality of battery modules 1000, which helps to simplify the connection process between the battery modules 1000 and the electrical module 4000.

[0189] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery module, characterized in that, include: Multiple battery cell assemblies, each battery cell assembly including multiple battery cells arranged along a first direction, the multiple battery cell assemblies arranged along a second direction, adjacent battery cell assemblies being connected, the first direction being perpendicular to the second direction; A first conductive element is connected to at least one of the battery cells; The second conductive element is connected to the same cell in the cell assembly as the first conductive element. The second conductive element is connected to at least one of the cells. The polarity of the first conductive element is opposite to that of the second conductive element. The first conductive element and the second conductive element are the positive and negative electrodes of the plurality of cell assemblies, respectively. Wherein, along the second direction, the first conductive element and the second conductive element are located on the same side of the plurality of battery cell assemblies; along the first direction, the battery cell connected to the second conductive element and the battery cell connected to the first conductive element are arranged adjacent to each other.

2. The battery module according to claim 1, characterized in that, The battery module includes a housing, the housing includes a first sidewall and a second sidewall disposed along the first direction, and the plurality of battery cell assemblies are disposed between the first sidewall and the second sidewall; The first conductive element is connected to the cell closest to the second sidewall of one of the cell assemblies.

3. The battery module according to claim 2, characterized in that, The plurality of battery cell assemblies includes a first battery cell assembly and a second battery cell assembly that are spaced apart along the second direction. The first conductive element is connected to the cell closest to the second sidewall of the first cell assembly; The cell closest to the second sidewall of the first cell assembly is connected in series with the cell closest to the second sidewall of the second cell assembly; The cell closest to the first sidewall of the first cell assembly is connected in series with the cell closest to the first sidewall of the second cell assembly.

4. The battery module according to claim 3, characterized in that, Each of the battery cells includes a battery cell body and a first electrode terminal and a second electrode terminal extending from the battery cell body. The first electrode terminal and the second electrode terminal are located on opposite sides of the battery cell body. One of the first electrode terminal and the second electrode terminal is a positive terminal and the other is a negative terminal. The battery module includes multiple busbar components, each of the busbar components includes multiple first busbars, and each first busbar is connected to at least two of the battery cells; The plurality of bus components include a first bus component, a second bus component, a third bus component, and a fourth bus component; The first busbar assembly and the second busbar assembly are respectively located on both sides of the first cell assembly along the second direction and connected to the first cell assembly; The third and fourth bus components are located on both sides of the second cell assembly along the second direction and are connected to the second cell assembly. The second bus component is connected to the third bus component.

5. The battery module according to claim 4, characterized in that, The second bus assembly includes a second bus member, which and the first conductive member are connected to the same battery cell; The third bus assembly includes a third bus member, which is connected to the cell closest to the second sidewall in the second cell assembly. The battery module includes a first connector, which connects the second busbar and the third busbar.

6. The battery module according to claim 5, characterized in that, The first connector includes a first connecting portion, a second connecting portion, and a third connecting portion connecting the first connecting portion and the second connecting portion; The first connecting portion and at least one first electrode terminal of the first cell assembly are stacked and connected, and the second connecting portion and at least one second electrode terminal of the second cell assembly are stacked and connected; or, the first connecting portion and at least one second electrode terminal of the first cell assembly are stacked and connected, and the second connecting portion and at least one first electrode terminal of the first cell assembly are stacked and connected.

7. The battery module according to any one of claims 4-6, characterized in that, The second bus assembly includes a fourth bus, which is connected to the cell of the first cell assembly closest to the first sidewall. The fourth bus assembly includes a fifth bus, which is connected to the cell of the second cell assembly closest to the first sidewall. The battery module includes a second connector, which connects the fourth busbar and the fifth busbar.

8. The battery module according to any one of claims 4-7, characterized in that, In each of the multiple cells of the battery cell assembly, n adjacent cells are connected in parallel to form a cell unit; multiple cell units are connected in series, where n is a positive integer greater than 1.

9. The battery module according to claim 8, characterized in that, n equals 3, and the plurality of cells in each cell assembly include a first cell, a second cell, a third cell, a fourth cell, a fifth cell, and a sixth cell arranged sequentially along the first direction; The first busbar includes a first welding area, a second welding area, and a third welding area arranged sequentially at intervals. The first welding area is welded to the first electrode terminal of the first battery cell, the second welding area is welded to the first electrode terminal of the second battery cell, the first electrode terminal of the third battery cell, the second electrode terminal of the fourth battery cell, and the second electrode terminal of the fifth battery cell, and the third welding area is welded to the second electrode terminal of the sixth battery cell.

10. The battery module according to claim 8 or 9, characterized in that, The second conductive element is connected to the second electrode terminals of the three cells in the first cell assembly, and the first conductive element is connected to the first electrode terminals of the three cells in the first cell assembly. The six cells are arranged sequentially along the first direction. Alternatively, the first conductive element is connected to the second electrode terminals of three cells in the first cell assembly, and the second conductive element is connected to the first electrode terminals of three cells in the first cell assembly, with the six cells arranged sequentially along the first direction.

11. The battery module according to any one of claims 4-10, characterized in that, Each of the busbar components includes an insulator and a sampling component; the first busbar component is connected to the insulator; The insulating component has multiple openings; the first busbar has a welding area, which is welded to the first electrode terminal and / or the second electrode terminal. When viewed along the second direction, the welding area is located within the openings. A portion of the sampling element is disposed on the side of the insulating element away from the cell body, and the sampling element is connected to at least one of the first busbars.

12. The battery module according to any one of claims 1-11, characterized in that, The first conductive element includes a first conductive portion and a second conductive portion, wherein the first conductive portion is connected to the battery cell, and the second conductive portion is configured to connect to an external device; The battery module includes an insulating bracket, the second conductive part is fixed to the insulating bracket, and the second conductive part is exposed in the insulating bracket.

13. The battery module according to claim 12, characterized in that, The second conductive element includes a third conductive portion and a fourth conductive portion, wherein the third conductive portion is connected to the battery cell and the fourth conductive portion is configured to connect to an external device; The fourth conductive part is fixed to the insulating bracket, and the fourth conductive part is exposed in the insulating bracket.

14. An energy storage device, characterized in that, It includes a plurality of battery modules according to any one of claims 1-13, wherein the plurality of battery modules are arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The first conductive components of the plurality of battery modules are arranged along the third direction, and the second conductive components of the plurality of battery modules are arranged along the third direction; The energy storage device includes multiple conductive connectors, each of which is connected to an adjacent battery module; In two adjacent battery modules, the conductive connector is connected to the first conductive element of one battery module, and the conductive connector is connected to the first conductive element or the second conductive element of the other battery module.

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