Battery monomer, battery, electric equipment and energy storage device

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment and an energy storage device. A battery cell includes a housing, a separation device, and a plurality of electrode assemblies. The shell is provided with a containing space, and the multiple electrode assemblies are contained in the containing space. The separating device is arranged in the accommodating space, the separating device is configured to separate the accommodating space into a plurality of subspaces, and each subspace accommodates at least one electrode assembly. And the separation device has a separation effect on the electrode assemblies in each subspace, so that the risk of mutual extrusion deformation of the electrode assemblies caused by expansion stress accumulation of the electrode assemblies in the adjacent subspaces is reduced, and the reliability of the battery monomer is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery, an electrical device and an energy storage device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have higher requirements in terms of performance.

[0003] For battery cells, the reliability of the battery cells needs to be considered. Therefore, how to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Summary of the invention

[0004] The embodiments of the present application provide a battery cell, a battery, an electrical device and an energy storage device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a separator and a plurality of electrode assemblies; the shell has a storage space; the plurality of electrode assemblies are stored in the storage space; the separator is disposed in the storage space, and the separator is configured to divide the storage space into a plurality of subspaces, each subspace storing at least one electrode assembly.

[0006] In the above technical solution, a partition device is provided in the accommodation space of the shell, and the partition device divides the accommodation space into a plurality of sub-spaces. The partition device plays a role of separating the electrode assemblies in each sub-space, so as to reduce the risk of expansion stress accumulation of the electrode assemblies in adjacent sub-spaces, thereby causing mutual squeezing and deformation of the electrode assemblies, thereby effectively improving the reliability of the battery cell.

[0007] In some embodiments, the partition device includes at least one partition wall, which is disposed in the accommodating space and connected to the outer shell, and the partition wall is configured to separate two adjacent sub-spaces.

[0008] In the above technical solution, the accommodation space inside the housing is divided into a plurality of sub-spaces by at least one partition wall, the structure is simple, and each partition wall can separate the electrode assemblies in two adjacent sub-spaces. Since the partition wall is connected to the housing, the expansion force generated by the expansion of the electrode assembly in the sub-space can be transmitted to the housing through the partition wall, reducing the risk of the expansion force generated by the electrode assembly in one sub-space being transmitted to the electrode assembly in another adjacent sub-space.

[0009] In some embodiments, the partition device includes a plurality of partition walls, and the plurality of partition walls are spaced apart and arranged in the accommodation space.

[0010] In the above technical solution, a plurality of partition walls arranged at intervals can divide the accommodating space into more subspaces, so that the electrode assemblies in more subspaces are separated by the partition walls, and the expansion force generated by all electrode assemblies can be transmitted to the outer shell through more partition walls, further reducing the risk of extrusion and deformation of the electrode assemblies.

[0011] In some embodiments, the housing includes a first wall portion, and the plurality of partition walls are connected to the first wall portion.

[0012] In the above technical solution, the multiple partition walls are all connected to the first wall portion, which can reduce the difficulty of connecting the multiple partition walls with the shell and make it easier to ensure the position accuracy of the multiple partition walls.

[0013] In some embodiments, the battery cell also includes a thermal management component, a receiving cavity is formed inside the partition wall, the thermal management component is received in the receiving cavity, and an opening for the thermal management component to enter the receiving cavity is provided on the outer surface of the first wall portion, and the opening is connected to the receiving cavity.

[0014] In the above technical solution, since the thermal management component is arranged in the receiving cavity of the partition wall, the space inside the partition wall is fully utilized, and the space inside the shell occupied by the thermal management component is reduced while achieving temperature management of the electrode assembly, freeing up more space for the electrode assembly, which is conducive to improving the volume energy density of the battery cell. In addition, since the outer surface of the first wall portion is provided with an opening connected to the receiving cavity, the thermal management component can enter the receiving cavity from the outside of the shell through the opening, and when installing and removing the thermal management component, there is no need to open the shell, which is more convenient to operate.

[0015] In some embodiments, the first wall portion is a wall portion having the largest outer surface area in the housing.

[0016] In the above technical solution, the first wall portion is the wall portion with the largest outer surface area in the shell, and the first wall portion can be connected to more partition walls to further reduce the expansion stress accumulation of all electrode assemblies.

[0017] In some embodiments, the electrode assembly includes a main body, a first pole ear and a second pole ear, the first pole ear and the second pole ear have opposite polarities, the first pole ear and the second pole ear are arranged at one end of the main body away from the first wall along the first direction, and multiple partition walls are arranged at intervals along the second direction, and the first direction intersects with the second direction; the battery cell includes a first current collecting member and a second current collecting member, along the first direction, the first current collecting member and the second current collecting member are arranged on the side of the main body away from the first wall, the first current collecting member connects the first pole ears of multiple electrode assemblies, and the second current collecting member connects the second pole ears of multiple electrode assemblies.

[0018] In the above technical solution, the first pole lugs of the plurality of electrode assemblies are connected by the first current collecting member, so that the first pole lugs of the plurality of electrode assemblies are converged, and the second pole lugs of the plurality of electrode assemblies are connected by the second current collecting member, so that the second pole lugs of the plurality of electrode assemblies are converged, and the thickness or volume of the single electrode assembly does not need to be increased, which can reduce the difficulty of manufacturing a large-capacity battery cell. In addition, since the first current collecting member and the second current collecting member are arranged on the side of the main body away from the first wall, the first current collecting member and the second current collecting member are located on the same side of the main body, which is conducive to reducing the stacking thickness of the first current collecting member and the second current collecting member in the first direction, reducing the space occupied by the first current collecting member and the second current collecting member inside the shell, and is conducive to improving the volume energy density of the battery cell.

[0019] In some embodiments, the housing includes a second wall portion, which is arranged opposite to the first wall portion along the first direction, and the second wall portion is provided with a first electrode terminal and a second electrode terminal, which are respectively connected to the first current collecting member and the second current collecting member.

[0020] In the above technical solution, the second wall portion is arranged opposite to the first wall portion along the first direction, and the first electrode terminal and the second electrode terminal are arranged on the second wall portion, so that the distance between the first electrode terminal and the first pole ear and between the second electrode terminal and the second pole ear can be reduced, which is beneficial to reducing the size of the first current collecting component and the second current collecting component, and reducing the current path from the first pole ear to the first electrode terminal and from the second pole ear to the second electrode terminal.

[0021] In some embodiments, the outer shell includes a second wall portion and a third wall portion, along the first direction, the first wall portion is arranged opposite to the second wall portion, the third wall portion connects the first wall portion and the second wall portion, and the third wall portion is provided with a first electrode terminal and a second electrode terminal; wherein the first current collecting member is provided with a first extension portion, and the second current collecting member is provided with a second extension portion, along the second direction, the first extension portion and the second extension portion are both located between the main body portion and the third wall portion, and the first extension portion and the second extension portion are respectively connected to the first electrode terminal and the second electrode terminal.

[0022] In the above technical solution, the first electrode terminal and the second electrode terminal are arranged on the third wall portion connected to the first wall portion and the second wall portion, so that the first electrode terminal and the second electrode terminal are not arranged on the first wall portion and the second wall portion, so that when multiple battery cells are stacked along the first direction, they are not easily affected by the first electrode terminal and the second electrode terminal, so that multiple battery cells can be stacked closely along the first direction. In addition, the first current collecting member is provided with a first extension portion, the first extension portion is located between the main body portion and the third wall portion, and the first extension portion is connected to the first electrode terminal, so that the connection area between the first current collecting member and the first pole ear and the connection area between the first extension portion and the first electrode terminal can be further away, reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the first current collecting member, the first pole ear and the first electrode terminal. The second current collecting member is provided with a second extension portion, the second extension portion is located between the main body portion and the third wall portion, and the second extension portion is connected to the second electrode terminal, so that the connection area between the second current collecting member and the second pole ear and the connection area between the second extension portion and the second electrode terminal can be further away, reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the second current collecting member, the second pole ear and the second electrode terminal.

[0023] In some embodiments, the housing includes a shell and an end cover; the shell has a first opening; the end cover covers the first opening; wherein the end cover is the first wall portion; or, the wall portion of the shell opposite to the end cover is the first wall portion.

[0024] In the above technical solution, if the end cap is the first wall portion, multiple partition walls are connected to the end cap, and the end cap is smaller in volume and weight than the shell, and the connection difficulty of multiple partition walls and the end cap is lower. In addition, if the wall portion of the shell and the end cap opposite to each other is the first wall portion, multiple partition walls are connected to the wall portion of the shell and the end cap opposite to each other. When assembling the battery cell, the electrode assembly can be first installed in the shell, and then the end cap can be connected to the shell, and the assembly difficulty of the battery cell is lower.

[0025] In some embodiments, the electrode assembly is flat, and the plurality of subspaces are arranged along the thickness direction of the electrode assembly.

[0026] In the above technical solution, the electrode assembly is flat, and the expansion of the electrode assembly in its thickness direction is the largest. Since multiple subspaces are arranged along the thickness direction of the electrode assembly, the expansion force generated by the expansion of the electrode assembly along the thickness direction can be borne by the partition wall, thereby reducing the accumulation of expansion stress of the electrode assemblies in adjacent subspaces, thereby reducing the risk of mutual squeezing and deformation of the electrode assemblies.

[0027] In some embodiments, each subspace accommodates a plurality of electrode assemblies, and the plurality of electrode assemblies in each subspace are stacked along a thickness direction of the electrode assembly.

[0028] In the above technical solution, each subspace accommodates a plurality of electrode assemblies stacked in the thickness direction, so that the thickness of the electrode assembly in each subspace is not too large, thereby reducing the difficulty of manufacturing the electrode assembly.

[0029] In some embodiments, the subspace is formed inside the partitioning device.

[0030] In the above technical solution, the subspace is formed inside the separator. After the electrode assembly is accommodated in the subspace, the separator can bear the expansion force of the electrode assembly in multiple directions, further improving the reliability of the battery cell.

[0031] In some embodiments, the partition device includes a plurality of receiving units disposed in the accommodating space, and a subspace is formed inside each receiving unit.

[0032] In the above technical solution, a subspace is formed inside each receiving unit, and multiple receiving units can receive the electrode assembly, and the receiving unit can bear the expansion force of the electrode assembly in multiple directions in the subspace. In addition, after the electrode assembly is accommodated in the receiving unit, the receiving unit can limit the electrode assembly, reducing the risk of the electrode assembly tilting and shaking inside the shell.

[0033] In some embodiments, two adjacent receiving units share a partition wall, and the partition wall is configured to separate subspaces of the two adjacent receiving units.

[0034] In the above technical solution, two adjacent receiving units share a partition wall. When the volume of the receiving space is constant, the volume of the subspace can be increased to free up more space for the electrode assembly, which is beneficial to improving the volume energy density of the battery cell. In addition, two adjacent receiving units share a partition wall, so that multiple receiving units can be used as a whole, and it is easier to install the partition device in the shell.

[0035] In some embodiments, the battery cell also includes a thermal management component, and a accommodating cavity is formed inside the partition wall, and the thermal management component is accommodated in the accommodating cavity; wherein, a second opening for the electrode assembly to enter the subspace is formed at at least one end of the accommodating unit along the first direction, and along the first direction, the outer shell includes a first wall portion arranged opposite to the partition device, and the outer surface of the first wall portion is provided with a mouth for the thermal management component to enter the accommodating cavity, and the mouth is connected to the accommodating cavity.

[0036] In the above technical solution, since the thermal management component is arranged in the receiving cavity of the partition wall, the space inside the partition wall is fully utilized, and the space inside the shell occupied by the thermal management component is reduced while achieving temperature management of the electrode assembly, freeing up more space for the electrode assembly, which is conducive to improving the volume energy density of the battery cell. In addition, since the outer surface of the first wall portion is provided with an opening connected to the receiving cavity, the thermal management component can enter the receiving cavity from the outside of the shell through the opening, and when installing and removing the thermal management component, there is no need to open the shell, which is more convenient to operate.

[0037] In some embodiments, the electrode assembly includes a main body, a first pole ear and a second pole ear, the first pole ear and the second pole ear have opposite polarities, and the first pole ear and the second pole ear are respectively arranged at two opposite ends of the main body along a first direction, and along the first direction, the two opposite ends of the receiving unit are provided with a second opening for the electrode assembly to enter the subspace; the battery cell includes a first current collecting member and a second current collecting member, and along the first direction, the first current collecting member and the second current collecting member are respectively arranged on two opposite sides of the main body, the first current collecting member connects the first pole ears of multiple electrode assemblies, and the second current collecting member connects the second pole ears of multiple electrode assemblies.

[0038] In the above technical solution, the first pole ear and the second pole ear are respectively arranged at two opposite ends of the main body along the first direction, and the first current collecting member connected to the first pole ear and the second current collecting member connected to the second pole ear are respectively arranged on two opposite sides of the main body, which can reduce the risk of mutual interference and short circuit between the first current collecting member and the second current collecting member. In addition, the first pole ears of multiple electrode assemblies are connected by the first current collecting member to achieve the convergence of the first pole ears of multiple electrode assemblies, and the second pole ears of multiple electrode assemblies are connected by the second current collecting member to achieve the convergence of the second pole ears of multiple electrode assemblies, without increasing the thickness or volume of a single electrode assembly, which can reduce the difficulty of manufacturing large-capacity battery cells.

[0039] In some embodiments, the outer shell includes a first wall portion and a second wall portion. The first wall portion and the second wall portion are arranged opposite to each other along a first direction. The first wall portion is provided with one end of a first pole ear facing the main body portion, and the second wall portion is provided with one end of a second pole ear facing the main body portion. The first wall portion is provided with a first electrode terminal, and the second wall portion is provided with a second electrode terminal. The first electrode terminal and the second electrode terminal are respectively connected to the first current collecting component and the second current collecting component.

[0040] In the above technical solution, the first wall portion is arranged at one end of the first pole lug facing the main body portion, the first electrode terminal is arranged at the first wall portion, and the first current collecting member connects the first electrode terminal and the first pole lug, so that the distance between the first electrode terminal and the first pole lug can be reduced, the size of the first current collecting member can be reduced, and the current flow path from the first pole lug to the first electrode terminal can be reduced. The second wall portion is arranged at one end of the second pole lug facing the main body portion, the second electrode terminal is arranged at the second wall portion, and the second current collecting member connects the second electrode terminal and the second pole lug, so that the distance between the second electrode terminal and the second pole lug can be reduced, the size of the second current collecting member can be reduced, and the current flow path from the second pole lug to the second electrode terminal can be reduced.

[0041] In some embodiments, the outer shell includes a first wall portion, a second wall portion and a third wall portion, along the first direction, the first wall portion is arranged opposite to the second wall portion, the third wall portion connects the first wall portion and the second wall portion, and the third wall portion is provided with a first electrode terminal and a second electrode terminal; wherein the first current collecting member is provided with a first extension portion, and the second current collecting member is provided with a second extension portion, along the second direction, the first extension portion and the second extension portion are both located between the main body portion and the third wall portion, the first extension portion and the second extension portion are respectively connected to the first electrode terminal and the second electrode terminal, and the second direction intersects with the first direction.

[0042] In the above technical solution, the first electrode terminal and the second electrode terminal are arranged on the third wall portion connected to the first wall portion and the second wall portion, so that the first electrode terminal and the second electrode terminal are not arranged on the first wall portion and the second wall portion, so that when multiple battery cells are stacked along the first direction, they are not easily affected by the first electrode terminal and the second electrode terminal, so that multiple battery cells can be tightly stacked along the first direction. In addition, the first current collecting member is provided with a first extension portion, the first extension portion is located between the main body portion and the third wall portion, and the first extension portion is connected to the first electrode terminal, which can make the connection area between the first current collecting member and the first pole ear and the connection area between the first extension portion and the first electrode terminal farther away, reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the first current collecting member, the first pole ear and the first electrode terminal. The second current collecting member is provided with a second extension portion, the second extension portion is located between the main body portion and the third wall portion, and the second extension portion is connected to the second electrode terminal, which can make the connection area between the second current collecting member and the second pole ear and the connection area between the second extension portion and the second electrode terminal farther away, reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the second current collecting member, the second pole ear and the second electrode terminal.

[0043] In some embodiments, a second opening for the electrode assembly to enter the subspace is formed at at least one end of the receiving unit along the first direction; the outer shell includes a shell and an end cover, and a first opening is formed at at least one end of the shell along the second direction, the end cover corresponds to the first opening one by one, and the end cover covers the first opening, and the second direction intersects with the first direction.

[0044] In the above technical solution, the receiving unit is provided with a second opening, and the electrode assembly can enter the receiving unit through the second opening, so as to facilitate the installation of the electrode assembly. The second opening of the receiving unit is in the first direction, and the first opening of the shell is in the second direction, and the first direction intersects with the second direction, so that the shell can cover the second opening of the receiving unit to restrict the electrode assembly in the receiving unit, and even if the end cover is not covered with the first opening, the electrode assembly is not easy to be separated from the receiving unit from the second opening.

[0045] In some embodiments, at least one wall portion of the housing disposed opposite to the partition device along the first direction is a wall portion of the housing having the largest outer surface area.

[0046] In the above technical solution, a second opening is formed at at least one end of the receiving unit along the first direction, and the electrode assembly can enter the receiving unit along the first direction from the second opening. Since at least one wall portion of the outer shell arranged opposite to the partition device along the first direction is the wall portion with the largest outer surface area in the outer shell, and the wall portion with the largest outer surface area in the outer shell is located in the first direction, the direction of the second opening is basically vertical to the wall portion with the largest outer surface area in the outer shell. In this way, more receiving units can be arranged in the receiving space of the outer shell to accommodate more electrode assemblies.

[0047] In some embodiments, along the first direction, the accommodating space accommodates only one accommodating unit; along the second direction, the accommodating space accommodates multiple accommodating units; along the third direction, the accommodating space accommodates multiple accommodating units, and the first direction, the second direction and the third direction are not coplanar and intersect with each other.

[0048] In the above technical solution, the accommodating space only accommodates one accommodating unit along the first direction, and the accommodating space accommodates multiple accommodating units along the second direction and the third direction. Under the condition that the size of the shell along the first direction is not too large, the accommodating space can accommodate more accommodating units to accommodate more electrode assemblies, which is conducive to realizing large-capacity battery cells.

[0049] In some embodiments, at least one wall portion of the shell disposed opposite to the partition device along the third direction is the wall portion with the largest outer surface area in the shell, and the first direction, the second direction and the third direction are not coplanar and intersect with each other.

[0050] In the above technical solution, a second opening is formed at at least one end of the receiving unit along the first direction, and the electrode assembly can enter the receiving unit along the first direction from the second opening. Since at least one wall portion of the outer shell arranged opposite to the partition device along the third direction is the wall portion with the largest outer surface area in the outer shell, and the wall portion with the largest outer surface area in the outer shell is located in the third direction, the direction of the second opening is basically parallel to the wall portion with the largest outer surface area in the outer shell. The outer shell can provide more space for the receiving unit in the first direction to increase the size of the receiving unit in the first direction.

[0051] In some embodiments, along the first direction, the accommodating space accommodates only one accommodating unit; along the second direction, the accommodating space accommodates multiple accommodating units; along the third direction, the accommodating space accommodates only one accommodating unit.

[0052] In the above technical solution, the accommodating space only accommodates one accommodating unit along the first direction and the third direction, and accommodates multiple accommodating units along the second direction. Under the condition that the dimensions of the shell along the first direction and the third direction are not too large, the accommodating space can accommodate more accommodating units to accommodate more electrode assemblies, which is conducive to realizing large-capacity battery cells.

[0053] In some embodiments, the electrode assembly is cylindrical, and each subspace accommodates only one electrode assembly.

[0054] In the above technical solution, the electrode assembly is cylindrical, and each subspace accommodates only one electrode assembly. Each electrode assembly is restricted by the separator, which reduces the expansion stress accumulation of two adjacent electrode assemblies. In addition, after one electrode assembly is accommodated in one subspace, each subspace can play a certain limiting role on the corresponding electrode assembly, reducing the risk of tilting and shaking of the electrode assembly.

[0055] In some embodiments, the partition device includes a partition wall configured to separate two adjacent subspaces, and a receiving cavity is formed inside the partition wall; the battery cell also includes a thermal management component, and the thermal management component is received in the receiving cavity.

[0056] In the above technical solution, a accommodating cavity is formed inside the partition wall, and the thermal management component is arranged in the accommodating cavity of the partition wall, so as to make full use of the space inside the partition wall. While achieving temperature management of the electrode assembly, the space inside the outer shell occupied by the thermal management component is reduced, thereby freeing up more space for the electrode assembly, which is beneficial to improving the volume energy density of the battery cell.

[0057] In some embodiments, the outer surface of the housing is provided with an opening for the heat management component to enter the accommodating cavity, and the opening is communicated with the accommodating cavity.

[0058] In the above technical solution, the outer surface of the shell is provided with a mouth communicating with the accommodating cavity, and the thermal management component can enter the accommodating cavity through the mouth from the outside of the shell. When installing or removing the thermal management component, there is no need to open the shell, which makes the operation more convenient.

[0059] In some embodiments, the housing is in the shape of a rectangular parallelepiped.

[0060] In the above technical solution, the outer shell is in the shape of a rectangular parallelepiped, and the multiple electrode assemblies can fully utilize the internal space of the outer shell, thereby improving the space utilization rate of the electrode assemblies, which is conducive to realizing a large-capacity battery cell.

[0061] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any embodiment of the first aspect.

[0062] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any one embodiment of the first aspect, wherein the battery cell is used to provide electrical energy to the electrical device.

[0063] In a fourth aspect, an embodiment of the present application provides an energy storage device, comprising a battery cell provided by any one embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0066] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0067] Figure 3 An exploded view of a battery cell (electrode assembly is flat) provided in some embodiments of the present application;

[0068] Figure 4 An exploded view of a battery cell (electrode assembly is flat) provided in some other embodiments of the present application;

[0069] Figure 5 for Figure 4 A schematic diagram of the connection between the housing and the partition device shown;

[0070] Figure 6 for Figure 5 A schematic structural diagram of the housing shown;

[0071] Figure 7 A schematic diagram of the structure of a housing provided in some other embodiments of the present application;

[0072] Figure 8 A schematic diagram of the connection between the housing and the thermal management component provided in some embodiments of the present application;

[0073] Fig. 9 An exploded view of a battery cell (electrode assembly is flat) provided in some other embodiments of the present application;

[0074] Fig.10 An exploded view of a battery cell (electrode assembly is flat) provided in some other embodiments of the present application;

[0075] Fig.11 An exploded view of a battery cell (electrode assembly is cylindrical) provided in some embodiments of the present application;

[0076] Fig.12 for Fig.11 A schematic structural diagram of the partition device shown;

[0077] Fig.13 for Fig.12 A top view of the partition device shown;

[0078] Fig.14 for Fig.13 A local enlarged view of point A in FIG.

[0079] Fig.15 A schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0080] Fig.16 An exploded view of a battery cell (electrode assembly is cylindrical) provided in some other embodiments of the present application;

[0081] Fig.17 An exploded view of a battery cell (the electrode assembly is cylindrical) provided in some other embodiments of the present application;

[0082] Fig.18 An exploded view of a battery cell (the electrode assembly is cylindrical) provided in some further embodiments of the present application.

[0083] Icons: 1-housing; 11-housing; 111-first wall; 1111-outer surface of the first wall; 1112-mouth; 112-second wall; 113-third wall; 114-first opening; 12-end cover; 13-accommodating space; 131-subspace; 2-electrode assembly; 21-first pole ear; 22-second pole ear; 23-main body; 3-first electrode terminal; 4-second electrode terminal; 5-first current collecting member; 51-first avoidance portion; 52-first protrusion; 53- First extension portion; 6-second current collecting member; 61-second avoidance portion; 62-second protrusion; 63-second extension portion; 7-partitioning device; 71-partitioning wall; 711-accommodating chamber; 72-accommodating unit; 721-second opening; 8-thermal management component; 10-battery cell; 20-housing; 201-first part; 202-second part; 100-battery; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0085] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0086] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0087] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0088] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0089] The term "plurality" used in the present application refers to two or more (including two).

[0090] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0091] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0092] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0093] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0094] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0095] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0096] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0097] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0098] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0099] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0100] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0101] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0102] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0103] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0104] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0105] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0106] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0107] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0108] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0109] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0110] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0111] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0113] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0114] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0115] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0116] In some embodiments, the electrode assembly is a laminate structure.

[0117] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0118] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0119] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0120] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0121] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0122] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0123] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0124] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0125] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0126] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0127] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0128] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0129] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0130] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell. As the demand for the capacity of the battery cell becomes higher and higher, in the large-capacity battery cells in the related art, the capacity of the battery cell can be increased by a large-sized electrode assembly. However, whether it is a laminated electrode assembly or a wound electrode assembly, it is difficult to make the thickness or volume of the electrode assembly large enough due to the limitations of the manufacturing process. The increase in the thickness or volume of the electrode assembly is likely to cause the electrode sheet to wrinkle, and the production quality of the electrode assembly is poor.

[0131] In order to achieve the large capacity requirement of the battery cell, it can also be achieved by increasing the number of electrode assemblies in the shell. However, as the number of electrode assemblies inside the shell increases, the accumulation of expansion stress of multiple electrode assemblies becomes more serious. During the charge and discharge process of the battery cell, it is easy for multiple electrode assemblies to squeeze and deform each other due to expansion, and even cause the electrode assemblies to be damaged, affecting the reliability of the battery cell.

[0132] Based on the above considerations, in order to solve the serious problem of expansion force accumulation between multiple electrode assemblies, the embodiment of the present application provides a battery cell, in which a separator is arranged in the shell, and the housing space of the shell is divided into multiple sub-spaces by the separator. In this way, the separator plays a role in separating the electrode assemblies in each sub-space, so as to reduce the risk of mutual compression and deformation of the electrode assemblies caused by the accumulation of expansion stress of the electrode assemblies in adjacent sub-spaces, and effectively improve the reliability of the battery cell.

[0133] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0134] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0135] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0136] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0137] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0138] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0139] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a battery cell 10 and a case 20 , wherein the battery cell 10 is accommodated in the case 20 .

[0140] Among them, the box body 20 is a component for accommodating the battery cell 10. The box body 20 provides a storage space for the battery cell 10. The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other to define a storage space for accommodating the battery cell 10. The first part 201 and the second part 202 may be in a variety of shapes, such as a cuboid, a cylinder, etc. The first part 201 may be a hollow structure with one side open, and the second part 202 may also be a hollow structure with one side open, and the open side of the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. It is also possible that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure, and the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space. The first part 201 and the second part 202 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0141] In the battery 100, there may be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 10 are both connected in series and in parallel. The battery modules may be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. Alternatively, all the battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 10 may be accommodated in the box 20.

[0142] Please refer to Figure 3 , Figure 3 The exploded view of the battery cell 10 (the electrode assembly 2 is flat) provided in some embodiments of the present application. The battery cell 10 may include a housing 1 and an electrode assembly 2, wherein the electrode assembly 2 is accommodated in the housing 1.

[0143] In some embodiments, the housing 1 may include a shell 11 and an end cover 12 , wherein the shell 11 has an opening and the end cover 12 closes the opening of the shell 11 .

[0144] The shell 11 is a component for accommodating the electrode assembly 2. The shell 11 may be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The shell 11 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 11 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0145] The end cap 12 is a component that closes the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the shell 11 together define a storage space 13 for accommodating the electrode assembly 2, the electrolyte and other components. The end cap 12 can be connected to the shell 11 by welding or crimping to close the opening of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0146] In the embodiment where an opening is formed at one end of the housing 11, one end cap 12 may be provided accordingly. In the embodiment where openings are formed at both ends of the housing 11, two end caps 12 may be provided accordingly, the two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space 13.

[0147] The electrode assembly 2 may be a laminated structure or a wound structure. There may be multiple electrode assemblies 2, and the multiple electrode assemblies 2 are accommodated in the housing 1.

[0148] In some embodiments, the battery cell 10 may further include an electrode terminal, which is disposed on the housing 1 and is used to electrically connect to the tab of the electrode assembly 2 to output the electrical energy of the battery cell 10. The electrode terminal may be disposed on the shell 11 of the housing 1 or on the end cover 12 of the housing 1. The electrode terminal and the tab may be directly connected, for example, the electrode terminal and the tab are welded. The electrode terminal and the tab may also be indirectly connected, for example, the electrode terminal and the tab are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0149] As an example, Figure 3As shown, an opening is formed at one end of the shell 11, and there is one end cap 12 in the shell 1, and one end cap 12 closes one opening of the shell 11. The first electrode terminal 3 and the second electrode terminal 4 are provided on the end cap 12, and a first pole tab 21 and a second pole tab 22 are formed at one end of the electrode assembly 2 facing the end cap 12, and the polarities of the first pole tab 21 and the second pole tab 22 are opposite, and the first pole tab 21 is connected to the first electrode terminal 3 through the first current collecting member 5 to realize the electrical connection between the first pole tab 21 and the first electrode terminal 3, and the second pole tab 22 is connected to the second electrode terminal 4 through the second current collecting member 6 to realize the electrical connection between the second pole tab 22 and the second electrode terminal 4.

[0150] Please refer to Figure 4 , Figure 4 Schematic diagram of the structure of a battery cell 10 provided in some other embodiments of the present application. The present application embodiment provides a battery cell 10, including a housing 1, a separator 7 and a plurality of electrode assemblies 2. The housing 1 has a receiving space 13 ( Figure 3 ), a plurality of electrode assemblies 2 are accommodated in the accommodation space 13. A separator 7 is disposed in the accommodation space 13, and the separator 7 is configured to separate the accommodation space 13 into a plurality of subspaces 131, each of which accommodates at least one electrode assembly 2.

[0151] The outer shell 1 may be cylindrical, prismatic, etc. Among them, the prism includes a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. The quadrangular prism includes a cuboid, a cube, etc. The multiple electrode assemblies 2 in the outer shell 1 may be arranged in a certain direction. Taking the outer shell 1 as a cuboid as an example, the battery cell 10 is a cuboid battery cell, and the multiple electrode assemblies 2 may be arranged along the length direction, width direction or thickness direction of the battery cell 10, wherein the thickness of the battery cell 10 is less than the length and width of the battery cell 10, and the length of the battery cell 10 is greater than or equal to the width of the battery cell 10. The multiple electrode assemblies 2 in the outer shell 1 may also be arranged in multiple directions, for example, the multiple electrode assemblies 2 are distributed in multiple rows and columns in the outer shell 1. The electrode assemblies 2 in the outer shell 1 may be two, three, four, five, etc. As an example, the number of electrode assemblies 2 is not less than 5.

[0152] The separator 7 is a component in the battery cell 10 that divides the accommodating space 13 of the housing 1 into a plurality of subspaces 131. The subspaces 131 may be defined by the separator 7 and the housing 1, or by the separator 7. For example, the subspaces 131 are formed inside the separator 7. The separator 7 is disposed in the accommodating space 13. The separator 7 may be connected to the housing 1 to fix the separator 7 to the housing 1. For example, the separator 7 may be connected to the end cover 12 of the housing 1. For another example, the separator 7 may be connected to the shell 11 of the housing 1. Alternatively, the separator 7 may be placed in the housing 1. The separator 7 and the housing 1 only keep in contact, but are not connected together. For example, the separator 7 may be placed in the shell 11 of the housing 1. The separator 7 and the shell 11 are in contact.

[0153] In the housing 1, the total space of the multiple subspaces 131 is a part of the accommodating space 13, and each subspace 131 can accommodate one electrode assembly 2 or multiple electrode assemblies 2. The multiple subspaces 131 can be arranged along a certain direction. For example, taking the battery cell 10 as a rectangular parallelepiped battery cell, the multiple subspaces 131 can be arranged along the length, width or thickness direction of the battery cell 10; the multiple subspaces 131 can also be arranged along multiple directions, for example, the multiple subspaces 131 are distributed in multiple rows and columns.

[0154] In this embodiment, a separator 7 is provided in the accommodating space 13 of the outer shell 1. The separator 7 divides the accommodating space 13 into a plurality of subspaces 131. The separator 7 separates the electrode assemblies 2 in each subspace 131 to reduce the risk of expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 131, thereby reducing the risk of mutual squeezing and deformation of the electrode assemblies 2, thereby effectively improving the reliability of the battery cell 10.

[0155] In some embodiments, please refer to Figure 5 , Figure 5 for Figure 4 The schematic diagram of the connection between the housing 11 and the partition device 7 is shown. The partition device 7 includes at least one partition wall 71, which is arranged in the accommodating space 13 and connected to the housing 1, and is configured to separate two adjacent sub-spaces 131.

[0156] The number of partition walls 71 may be one or more. The number of subspaces 131 may be one more than the number of sub-partition walls 71. For example, if there is one partition wall 71, there are two subspaces 131. For another example, if there are two partition walls 71, there are three subspaces 131.

[0157] The partition wall 71 may be plate-shaped, and the partition wall 71 may be a solid structure or a hollow structure. The partition wall 71 is connected to the outer shell 1 to fix the partition wall 71 to the outer shell 1. The partition wall 71 may be connected to the shell 11 or the end cover 12 of the outer shell 1, or the partition wall 71 may be connected to both the shell 11 and the end cover 12. If the partition wall 71 is connected to the shell 11, the partition wall 71 may be connected to one wall portion of the shell 11, or may be connected to multiple wall portions of the shell 11. If there are multiple partition walls 71, the multiple partition walls 71 may be connected to the same wall portion of the outer shell 1, for example, the multiple partition walls 71 are all connected to the end cover 12 of the outer shell 1; the multiple partition walls 71 may also be connected to different wall portions of the outer shell 1, for example, a part of the multiple partition walls 71 is connected to the end cover 12, and another part is connected to the shell 11.

[0158] In this embodiment, the accommodating space 13 inside the housing 1 is divided into a plurality of subspaces 131 by at least one partition wall 71, and the structure is simple, and each partition wall 71 can separate the electrode assemblies 2 in two adjacent subspaces 131. Since the partition wall 71 is connected to the housing 1, the expansion force generated by the expansion of the electrode assembly 2 in the subspace 131 can be transmitted to the housing 1 through the partition wall 71, thereby reducing the risk of the expansion force generated by the electrode assembly 2 in one subspace 131 being transmitted to the electrode assembly 2 in another adjacent subspace 131.

[0159] In some embodiments, please refer to Figure 5 The partition device 7 includes a plurality of partition walls 71 , and the plurality of partition walls 71 are arranged at intervals in the accommodating space 13 .

[0160] Taking the case 1 as a rectangular parallelepiped as an example, the arrangement direction of the plurality of partition walls 71 may be parallel to the length direction, width direction or thickness direction of the battery cell 10. Figure 5 In the embodiment, the arrangement direction of the plurality of partition walls 71 is parallel to the length direction of the battery cell 10 . There are four partition walls 71 , and the four partition walls 71 divide the accommodation space 13 into five sub-spaces 131 .

[0161] As an example, in Figure 5 In the diagram, the first direction X is parallel to the thickness direction of the battery cell 10 , the second direction Y is parallel to the length direction of the battery cell 10 , and the third direction Z is parallel to the width direction of the battery cell 10 .

[0162] In this embodiment, a plurality of partition walls 71 arranged at intervals can divide the accommodating space 13 into more subspaces 131, so that more electrode assemblies 2 in the subspaces 131 are separated by the partition walls 71, and the expansion force generated by all electrode assemblies 2 can be transmitted to the outer shell 1 through more partition walls 71, further reducing the risk of extrusion and deformation of the electrode assemblies 2.

[0163] In some embodiments, please refer to Figure 6 , Figure 6 for Figure 5 The structure diagram of the housing 11 is shown in FIG. Figure 6 The PCB (not shown) includes a first wall portion 111 to which a plurality of partition walls 71 are connected.

[0164] The plurality of partition walls 71 are connected to the same wall portion of the housing 1, which is the first wall portion 111. The first wall portion 111 may be a wall portion of the housing 1 in the length direction of the battery cell 10, or a wall portion of the housing 1 in the width direction of the battery cell 10, or a wall portion of the housing 1 in the thickness direction of the battery cell 10.

[0165] In the housing 1, the end cover 12 may be used as the first wall portion 111, or a wall portion in the housing 11 may be used as the first wall portion 111. In the embodiment where a wall portion in the housing 11 is used as the first wall portion 111, the wall portion of the housing 11 opposite to the end cover 12 may be used as the first wall portion 111, or the wall portion of the housing 11 adjacent to the end cover 12 may be used as the first wall portion 111.

[0166] The partition wall 71 and the first wall portion 111 may be integrally formed, or the partition wall 71 and the first wall portion 111 may be separately provided and connected, for example, the partition wall 71 and the first wall portion 111 are welded.

[0167] In this embodiment, the plurality of partition walls 71 are all connected to the first wall portion 111 , which can reduce the difficulty of connecting the plurality of partition walls 71 to the housing 1 and make it easier to ensure the position accuracy of the plurality of partition walls 71 .

[0168] In some embodiments, please refer to Figure 7 and Figure 8 , Figure 7 A schematic diagram of the structure of the housing 11 provided in some other embodiments of the present application; Figure 8 Schematic diagram of connection between the housing 11 and the thermal management component 8 provided in some embodiments of the present application. The battery cell 10 may further include a thermal management component 8, a receiving cavity 711 is formed inside the partition wall 71, the thermal management component 8 is received in the receiving cavity 711, and an opening 1112 for the thermal management component 8 to enter the receiving cavity 711 is provided on the outer surface 1111 of the first wall portion, and the opening 1112 is communicated with the receiving cavity 711.

[0169] The thermal management component 8 is a component for managing the temperature of the battery cell 10, and is used for heat exchange with the battery cell 10 to manage the temperature of the battery cell 10. The thermal management component 8 may be a heating component for heating the battery cell 10, or a cooling component for cooling the battery cell 10. The cooling component may be a heat sink, a water cooling plate, etc.

[0170] The accommodating chamber 711 is formed inside the partition wall 71, so that the partition wall 71 is a hollow structure. The accommodating chamber 711 and the subspace 131 are separated by the chamber wall of the accommodating chamber 711, that is, the accommodating chamber 711 and the subspace 131 are independent of each other and are not connected to each other, and the electrolyte in the subspace 131 does not enter the accommodating chamber 711. The opening 1112 on the outer surface 1111 of the first wall portion is the entrance for the thermal management component 8 to enter the accommodating chamber 711, and the thermal management component 8 can enter the accommodating chamber 711 from the opening 1112. The opening 1112 on the outer surface 1111 of the first wall portion can correspond to the partition wall 71 one by one.

[0171] The thermal management component 8 is accommodated in the accommodating cavity 711. A part of the thermal management component 8 can be accommodated in the accommodating cavity 711, or the thermal management component 8 can be accommodated in the accommodating cavity 711. The thermal management component 8 can contact the cavity wall of the accommodating cavity 711 to better exchange heat with the battery cell 10.

[0172] In this embodiment, the thermal management component 8 is disposed in the accommodating cavity 711 of the partition wall 71, and the space inside the partition wall 71 is fully utilized. When the temperature management of the electrode assembly 2 is achieved, the space inside the housing 1 occupied by the thermal management component 8 is reduced, and more space is freed up for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10. In addition, since the outer surface 1111 of the first wall portion is provided with a mouth 1112 communicating with the accommodating cavity 711, the thermal management component 8 can enter the accommodating cavity 711 from the outside of the housing 1 through the mouth 1112, and when installing or removing the thermal management component 8, there is no need to open the housing 1, and the operation is more convenient.

[0173] In some embodiments, the first wall portion 111 is the wall portion with the largest outer surface area in the housing 1 .

[0174] Taking the case 1 as a rectangular parallelepiped, the first wall 111 is the wall of the case 1 in the thickness direction of the battery cell 10. The end cover 12 of the case 1 can be the first wall 111, or the wall of the shell 11 of the case 1 opposite to the end cover 12 can be the first wall 111. Figure 8 In the illustrated embodiment, the wall portion of the housing 11 opposite to the end cover 12 serves as the first wall portion 111 .

[0175] In this embodiment, the first wall portion 111 is the wall portion with the largest outer surface area in the housing 1 , and the first wall portion 111 can be connected to more partition walls 71 to further reduce the expansion stress accumulation of all electrode assemblies 2 .

[0176] In some embodiments, please refer to Figure 4The electrode assembly 2 may include a main body 23, a first electrode tab 21 and a second electrode tab 22, the first electrode tab 21 and the second electrode tab 22 have opposite polarities, and are disposed at one end of the main body 23 away from the first wall 111 along the first direction X, and a plurality of partition walls 71 are disposed at intervals along the second direction Y, and the first direction X intersects the second direction Y. The battery cell 10 includes a first current collecting member 5 and a second current collecting member 6, and along the first direction X, the first current collecting member 5 and the second current collecting member 6 are disposed at one side of the main body 23 away from the first wall 111, the first current collecting member 5 connects the first electrode tabs 21 of the plurality of electrode assemblies 2, and the second current collecting member 6 connects the second electrode tabs 22 of the plurality of electrode assemblies 2.

[0177] The first pole tab 21 and the second pole tab 22 are disposed at the same end of the main body 23 along the first direction X. One of the first pole tab 21 and the second pole tab 22 is a positive pole tab, and the other is a negative pole tab. The main body 23 may be a portion of the electrode assembly 2 corresponding to the region where the pole piece is coated with the active material layer, the positive pole tab may be a portion of the positive pole piece not coated with the positive active material layer, and the negative pole tab may be a portion of the negative pole piece not coated with the negative active material layer.

[0178] Multiple partition walls 71 are arranged at intervals along the second direction Y. It can be understood that if there are multiple subspaces 131, the multiple subspaces 131 are arranged along the second direction Y. Multiple electrode assemblies 2 in the battery cell 10 can be arranged along the second direction Y. Along the second direction Y, each subspace 131 can accommodate one electrode assembly 2 or multiple electrode assemblies 2. The second direction Y can be set at an acute angle, a right angle, or an obtuse angle with the first direction X. Taking the case 1 as a rectangular parallelepiped as an example, if the second direction Y is perpendicular to the first direction X, the first direction X and the second direction Y can be any two of the length direction, width direction, and thickness direction of the battery cell 10.

[0179] The first current collecting member 5 and the second current collecting member 6 are both located in the accommodation space 13. The first current collecting member 5 and the second current collecting member 6 are both conductors. The materials of the first current collecting member 5 and the second current collecting member 6 can be the same or different. The material of the first current collecting member 5 can be copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the second current collecting member 6 can be copper, iron, aluminum, steel, aluminum alloy, etc. The first current collecting member 5 and the second current collecting member 6 can be sheet-like structures. The first current collecting member 5 and the second current collecting member 6 are located on the same side of the main body 23 to be connected to the first pole tab 21 and the second pole tab 22 located on the side of the main body 23, respectively. The first pole tabs 21 of all electrode assemblies 2 are connected to the first current collecting member 5, and the second pole tabs 22 of all electrode assemblies 2 are connected to the second current collecting member 6. The first pole tab 21 and the first current collecting member 5 can be connected in a variety of ways to achieve electrical connection between the first pole tab 21 and the first current collecting member 5, such as welding, conductive adhesive bonding, etc. The second electrode tab 22 and the second current collecting member 6 can be connected in a variety of ways to achieve electrical connection between the second electrode tab 22 and the second current collecting member 6 , such as welding, bonding with a conductive adhesive, etc.

[0180] The first current collecting component 5 and the second current collecting component 6 are arranged at intervals along the third direction Z, and the partition wall 71 extends along the third direction Z. Along the third direction Z, one end or both ends of the partition wall 71 can be connected to the wall corresponding to the outer shell 1, or one end or both ends of the partition wall 71 can be arranged with a gap between the wall corresponding to the outer shell 1.

[0181] The first direction X, the second direction Y and the third direction Z intersect each other and are not coplanar. The third direction Z can be set at an acute angle, a right angle or an obtuse angle with the first direction X, and the third direction Z can be set at an acute angle, a right angle or an obtuse angle with the second direction Y. Taking the first direction X, the second direction Y and the third direction Z as an example, one of the first direction X, the second direction Y and the third direction Z can be parallel to the length direction of the battery cell 10, another can be parallel to the width direction of the battery cell 10, and another can be parallel to the thickness direction of the battery cell 10. As an example, in Figure 4 In the diagram, the first direction X is parallel to the thickness direction of the battery cell 10 , the second direction Y is parallel to the length direction of the battery cell 10 , and the third direction Z is parallel to the width direction of the battery cell 10 .

[0182] As an example, the first electrode tab 21 may be bent around the first current collecting member 5 so that a portion of the first electrode tab 21 is located on a side of the first current collecting member 5 away from the first wall portion 111 and connected to the second current collecting member 6. Specifically, the first current collecting member 5 is provided with a first avoidance portion 51 penetrating the first current collecting member 5 along the first direction X, the first electrode tab 21 passes through the first avoidance portion 51, and a portion of the first electrode tab 21 is located on a side of the first current collecting member 5 away from the first wall portion 111 and connected to the first current collecting member 5. The second electrode tab 22 may be bent around the second current collecting member 6 so that a portion of the second electrode tab 22 is located on a side of the second current collecting member 6 away from the first wall portion 111 and connected to the second current collecting member 6. Specifically, the second current collecting member 6 is provided with a second avoidance portion 61 penetrating the second current collecting member 6 along the first direction X, the second electrode tab 22 passes through the second avoidance portion 61, and a portion of the second electrode tab 22 is located on a side of the second current collecting member 6 away from the first wall portion 111 and connected to the second current collecting member 6.

[0183] In this embodiment, the first pole tabs 21 of the plurality of electrode assemblies 2 are connected by the first current collecting member 5, so that the first pole tabs 21 of the plurality of electrode assemblies 2 are converged, and the second pole tabs 22 of the plurality of electrode assemblies 2 are connected by the second current collecting member 6, so that the second pole tabs 22 of the plurality of electrode assemblies 2 are converged, and the thickness or volume of the single electrode assembly 2 does not need to be increased, which can reduce the difficulty of manufacturing the large-capacity battery cell 10. In addition, since the first current collecting member 5 and the second current collecting member 6 are arranged on the side of the main body 23 away from the first wall 111, the first current collecting member 5 and the second current collecting member 6 are located on the same side of the main body 23, which is conducive to reducing the stacking thickness of the first current collecting member 5 and the second current collecting member 6 in the first direction X, reducing the space occupied by the first current collecting member 5 and the second current collecting member 6 inside the housing 1, and is conducive to improving the volume energy density of the battery cell 10.

[0184] In some embodiments, please refer to Figure 4 The housing 1 may include a second wall portion 112, which is arranged opposite to the first wall portion 111 along the first direction X. The second wall portion 112 is provided with a first electrode terminal 3 and a second electrode terminal 4, which are respectively connected to the first current collecting member 5 and the second current collecting member 6.

[0185] The second wall portion 112 is a wall portion in the housing 1 opposite to the first wall portion 111. In an embodiment in which the housing 11 is opened at one end, one of the second wall portion 112 and the first wall portion 111 may be the end cover 12, and the other may be the wall portion in the housing 11 opposite to the end cover 12, or the second wall portion 112 and the first wall portion 111 may be two opposite walls of the housing 11; in an embodiment in which the housing 11 is opened at both ends, the second wall portion 112 and the first wall portion 111 may be two opposite walls of the housing 11, or the second wall portion 112 and the first wall portion 111 may be two end covers 12. As an example, in Figure 4 In the embodiment, an opening is formed at one end of the shell 11 , the end cover 12 is a second wall portion 112 , a wall portion of the shell 11 opposite to the end cover 12 is a first wall portion 111 , and the partition wall 71 is connected to the first wall portion 111 .

[0186] The first electrode terminal 3 and the second electrode terminal 4 are components in the battery cell 10 for connecting with external components or external devices to input or output the electric energy of the battery cell 10. The first electrode terminal 3 and the second electrode terminal 4 may be columnar, and the first electrode terminal 3 and the second electrode terminal 4 may be insulated and installed on the second wall portion 112. Along the first direction X, the first current collecting member 5 and the second current collecting member 6 are both located between the main body 23 and the second wall portion 112. The first current collecting member 5 and the first electrode terminal 3 may be connected in a variety of ways to achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3, such as welding, conductive adhesive bonding, etc. To facilitate the connection between the first current collecting member 5 and the first electrode terminal 3, a first protrusion 52 may be provided on the surface of the first current collecting member 5 facing the first electrode terminal 3. The second current collecting member 6 and the second electrode terminal 4 may be connected in a variety of ways to achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4, such as welding, conductive adhesive bonding, etc. To facilitate the connection between the second current collecting member 6 and the second electrode terminal 4 , a second protrusion 62 may be provided on a surface of the second current collecting member 6 facing the second electrode terminal 4 .

[0187] In this embodiment, the second wall portion 112 is arranged opposite to the first wall portion 111 along the first direction X, and the first electrode terminal 3 and the second electrode terminal 4 are arranged on the second wall portion 112. This can reduce the distance between the first electrode terminal 3 and the first electrode tab 21 and between the second electrode terminal 4 and the second electrode tab 22, which is beneficial to reducing the size of the first current collecting component 5 and the second current collecting component 6, and reducing the current path from the first electrode tab 21 to the first electrode terminal 3 and from the second electrode tab 22 to the second electrode terminal 4.

[0188] In some embodiments, please refer to Fig. 9 , Fig. 9An exploded view of a battery cell 10 (electrode assembly 2 is flat) provided for some other embodiments of the present application. The housing 1 may include a second wall portion 112 and a third wall portion 113. Along the first direction X, the first wall portion 111 is arranged opposite to the second wall portion 112. The third wall portion 113 connects the first wall portion 111 and the second wall portion 112. The third wall portion 113 is provided with a first electrode terminal 3 and a second electrode terminal 4. Among them, the first current collecting member 5 is provided with a first extension portion 53, and the second current collecting member 6 is provided with a second extension portion 63. Along the second direction Y, the first extension portion 53 and the second extension portion 63 are both located between the main body portion 23 and the third wall portion 113. The first extension portion 53 and the second extension portion 63 are connected to the first electrode terminal 3 and the second electrode terminal 4, respectively.

[0189] The third wall portion 113 is a wall portion in the housing 1 that connects the second wall portion 112 and the first wall portion 111 and is located in the second direction Y, and the first wall portion 111 and the second wall portion 112 are both adjacent to the third wall portion 113. As an example, the second wall portion 112 is the end cover 12, the first wall portion 111 is a wall portion in the housing 11 that is opposite to the second wall portion 112, and the third wall portion 113 is a wall portion in the housing 11 that is adjacent to the second wall portion 112.

[0190] The first extension portion 53 may be a sheet-like structure connected to the first current collecting member 5. The first extension portion 53 may be connected to one end of the first current collecting member 5 facing the third wall portion 113 along the second direction Y. The angle between the first extension portion 53 and the first current collecting member 5 may be an acute angle, a right angle, an obtuse angle, etc. Along the second direction Y, the first extension portion 53 is located between the main body portion 23 and the third wall portion 113. It can be understood that along the second direction Y, the first extension portion 53 is located between the third wall portion 113 and each main body portion 23, that is, along the second direction Y, the main body portions 23 of all electrode assemblies 2 are located on the side of the first extension portion 53 away from the third wall portion 113.

[0191] The second extension portion 63 may be a sheet-like structure connected to the second current collecting member 6. The second extension portion 63 may be connected to one end of the second current collecting member 6 facing the third wall portion 113 along the second direction Y. The angle between the second extension portion 63 and the second current collecting member 6 may be an acute angle, a right angle, an obtuse angle, etc. Along the second direction Y, the second extension portion 63 is located between the main body 23 and the third wall portion 113. It can be understood that along the second direction Y, the second extension portion 63 is located between the third wall portion 113 and each main body 23, that is, along the second direction Y, the main body 23 of all electrode assemblies 2 is located on the side of the second extension portion 63 away from the third wall portion 113.

[0192] The first extension portion 53 and the first electrode terminal 3 can be connected in a variety of ways to achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3, such as welding, conductive adhesive bonding, etc. To facilitate the connection between the first extension portion 53 and the first electrode terminal 3, a first protrusion 52 can be provided on the surface of the first extension portion 53 facing the first electrode terminal 3. The second extension portion 63 and the second electrode terminal 4 can be connected in a variety of ways to achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4, such as welding, conductive adhesive bonding, etc. To facilitate the connection between the second extension portion 63 and the second electrode terminal 4, a second protrusion 62 can be provided on the surface of the second extension portion 63 facing the second electrode terminal 4.

[0193] In the present embodiment, the first electrode terminal 3 and the second electrode terminal 4 are arranged on the third wall portion 113 connected to the first wall portion 111 and the second wall portion 112, so that the first electrode terminal 3 and the second electrode terminal 4 are not arranged on the first wall portion 111 and the second wall portion 112, so that the plurality of battery cells 10 are not easily affected by the first electrode terminal 3 and the second electrode terminal 4 when stacked along the first direction X, so that the plurality of battery cells 10 can be closely stacked along the first direction X. In addition, the first current collecting member 5 is provided with a first extension portion 53, the first extension portion 53 is located between the main body portion 23 and the third wall portion 113, and the first extension portion 53 is connected to the first electrode terminal 3, so that the connection area between the first current collecting member 5 and the first pole tab 21 and the connection area between the first extension portion 53 and the first electrode terminal 3 can be further away, thereby reducing the risk of mutual influence, and facilitating reducing the difficulty of connecting the first current collecting member 5, the first pole tab 21 and the first electrode terminal 3. The second current collecting member 6 is provided with a second extension portion 63, which is located between the main body portion 23 and the third wall portion 113, and the second extension portion 63 is connected to the second electrode terminal 4, so that the connection area between the second current collecting member 6 and the second pole lug 22 and the connection area between the second extension portion 63 and the second electrode terminal 4 can be farther away, thereby reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the second current collecting member 6, the second pole lug 22 and the second electrode terminal 4.

[0194] In some embodiments, please refer to Fig. 9 The housing 1 comprises a shell 11 and an end cover 12. The shell 11 has a first opening 114. The end cover 12 covers the first opening 114. The wall portion of the shell 11 opposite to the end cover 12 is a first wall portion 111.

[0195] As an example, in Fig. 9 In the embodiment, one end of the shell 11 forms an opening, and the end cover 12 in the housing 1 is one.

[0196] It can be understood that the plurality of partition walls 71 in the partition device 7 are connected to the wall portion of the shell 11 opposite to the end cover 12 .

[0197] In this embodiment, the wall portion opposite to the shell 11 and the end cover 12 is the first wall portion 111, and the plurality of partition walls 71 are connected to the wall portion opposite to the shell 11 and the end cover 12. When assembling the battery cell 10, the electrode assembly 2 can be first installed in the shell 11, and then the end cover 12 can be connected to the shell 11, which makes the assembly of the battery cell 10 easier.

[0198] In some embodiments, please refer to Fig.10 , Fig.10 The exploded view of the battery cell 10 (the electrode assembly 2 is flat) provided in some embodiments of the present application; the housing 1 includes a shell 11 and an end cover 12, the shell 11 has a first opening 114, and the end cover 12 covers the first opening 114. The end cover 12 is a first wall portion 111.

[0199] As an example, in Fig.10 In the embodiment, one end of the shell 11 forms an opening, and the end cover 12 in the housing 1 is one.

[0200] It can be understood that the plurality of partition walls 71 in the partition device 7 are connected to the end cover 12 .

[0201] In this embodiment, the end cover 12 is the first wall portion 111 , and the plurality of partition walls 71 are connected to the end cover 12 . The end cover 12 is smaller in size and weight than the shell 11 , and the connection difficulty between the plurality of partition walls 71 and the end cover 12 is lower.

[0202] In some embodiments, please refer to Fig. 9 and Fig.10 The electrode assembly 2 is flat, and a plurality of subspaces 131 are arranged along the thickness direction of the electrode assembly 2 .

[0203] The flat electrode assembly 2 may be a laminated structure or a wound structure. The thickness of the flat electrode assembly 2 is less than the width of the electrode assembly 2 and the length of the electrode assembly 2. The electrode assembly 2 may be roughly rectangular, and the first pole ear 21 and the second pole ear 22 may be arranged at one end of the main body 23 in the width direction of the electrode assembly 2. If the electrode assembly 2 is a laminated structure, the stacking direction of the pole pieces in the electrode assembly 2 is parallel to the thickness direction of the electrode assembly 2; if the electrode assembly 2 is a wound structure, the electrode assembly 2 includes a straight area and a bending area, the bending area is connected to the straight area, and the stacking direction of the pole pieces in the straight area is parallel to the thickness direction of the electrode assembly 2.

[0204] As an example, multiple subspaces 131 are arranged along the second direction Y, the second direction Y is parallel to the thickness direction of the electrode assembly 2, the first direction X is parallel to the width direction of the electrode assembly 2, and the third direction Z is parallel to the length direction of the electrode assembly 2.

[0205] In this embodiment, the electrode assembly 2 is flat, and the expansion of the electrode assembly 2 in its thickness direction is the largest. Since the multiple subspaces 131 are arranged along the thickness direction of the electrode assembly 2, the expansion force generated by the expansion of the electrode assembly 2 along the thickness direction can be borne by the partition wall 71, thereby reducing the expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 131, and the risk of mutual squeezing and deformation of the electrode assemblies 2.

[0206] In some embodiments, please refer to Fig. 9 and Fig.10 Each subspace 131 accommodates a plurality of electrode assemblies 2 , and the plurality of electrode assemblies 2 in each subspace 131 are stacked along the thickness direction of the electrode assemblies 2 .

[0207] The number of electrode assemblies 2 in the subspace 131 may be two, three, four, five, etc. The number of electrode assemblies 2 in each subspace 131 may be equal or different. As an example, the number of electrode assemblies 2 in each subspace 131 is equal, that is, two.

[0208] In this embodiment, each subspace 131 accommodates a plurality of electrode assemblies 2 stacked in the thickness direction, so that the thickness of the electrode assembly 2 in each subspace 131 is not too large, thereby reducing the difficulty of manufacturing the electrode assembly 2.

[0209] In some embodiments, please refer to Fig.11 , Fig.11 An exploded view of a battery cell 10 (the electrode assembly 2 is cylindrical) provided in some embodiments of the present application; a subspace 131 is formed inside the separator 7.

[0210] It can be understood that the subspace 131 is located both inside the housing 1 and inside the partition 7. The subspace 131 can be in various shapes, such as cylindrical or prism-shaped. The prism can be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, in Fig.11 In the figure, the subspace 131 is in the shape of a hexagonal prism.

[0211] There are multiple subspaces 131 inside the partition device 7, and the multiple subspaces 131 can be arranged along a certain direction. Taking the battery cell 10 as a rectangular battery cell as an example, the multiple subspaces 131 can be arranged in the partition device 7 along the length, width or thickness direction of the battery cell 10; the multiple subspaces 131 can also be arranged in the partition device 7 along multiple directions, for example, the multiple subspaces 131 are distributed in the partition device 7 in multiple rows and columns.

[0212] In this embodiment, the subspace 131 is formed inside the separator 7 . After the electrode assembly 2 is accommodated in the subspace 131 , the separator 7 can bear the expansion force of the electrode assembly 2 in multiple directions, thereby further improving the reliability of the battery cell 10 .

[0213] In some embodiments, please refer to Fig.12 , Fig.12 for Fig.11 The structure diagram of the partition device 7 is shown. The partition device 7 comprises a plurality of receiving units 72 arranged in the accommodating space 13, and a subspace 131 is formed inside each receiving unit 72.

[0214] The multiple receiving units 72 in the partition device 7 can be independent of each other, or at least two receiving units 72 can be connected to each other. Fig.12 In the embodiment, all the receiving units 72 are connected to each other to form a whole. In two adjacent receiving units 72, if the two receiving units 72 are connected to each other, they can be directly connected or indirectly connected through an intermediate connecting member. If the two adjacent receiving units 72 are directly connected, the outer surfaces of the two receiving units 72 can be directly connected, or the two receiving units 72 can share a wall.

[0215] In this embodiment, a subspace 131 is formed inside each receiving unit 72, and multiple receiving units 72 can receive the electrode assembly 2, and the receiving unit 72 can bear the expansion force of the electrode assembly 2 in multiple directions in the subspace 131. In addition, after the electrode assembly 2 is accommodated in the receiving unit 72, the receiving unit 72 can limit the electrode assembly 2, reducing the risk of the electrode assembly 2 tilting and shaking inside the housing 1.

[0216] In some embodiments, please refer to Fig.12 The two adjacent receiving units 72 share a partition wall 71 , and the partition wall 71 is configured to separate the subspaces 131 of the two adjacent receiving units 72 .

[0217] The partition wall 71 is a wall portion shared by adjacent receiving units 72 , and the electrode assemblies 2 in two adjacent receiving units 72 are respectively located on both sides of the partition wall 71 .

[0218] As an example, in Fig.12 In the embodiment, all the receiving units 72 in the partition device 7 are integrally formed, the receiving units 72 are in the shape of a hexagonal prism, the subspaces 131 in the receiving units 72 are also in the shape of a hexagonal prism, and the partition device 7 is in the shape of a honeycomb.

[0219] In this embodiment, two adjacent receiving units 72 share a partition wall 71. When the volume of the accommodating space 13 is constant, the volume of the subspace 131 can be increased to free up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10. In addition, two adjacent receiving units 72 share a partition wall 71, so that the multiple receiving units 72 can be used as a whole, and it is easier to install the partition device 7 in the housing 1.

[0220] In some embodiments, please refer to Figure 13-Figure 15 , Fig.13 A top view of a partition device 7 provided in some embodiments of the present application; Fig.14 for Fig.13 A local enlarged view of point A in FIG. Fig.15 A schematic diagram of the structure of the shell 11 provided for some embodiments of the present application. The battery cell 10 also includes a thermal management component 8, and a receiving cavity 711 is formed inside the partition wall 71, and the thermal management component 8 is received in the receiving cavity 711. Among them, at least one end of the receiving unit 72 along the first direction X is formed with a second opening 721 for the electrode assembly 2 to enter the subspace 131, and along the first direction X, the shell 1 includes a first wall portion 111 arranged opposite to the partition device 7, and the outer surface 1111 of the first wall portion is provided with an opening 1112 for the thermal management component 8 to enter the receiving cavity 711, and the opening 1112 is connected to the receiving cavity 711.

[0221] Along the first direction X, the receiving unit 72 may have a second opening 721 ( Fig.12 ), or the second openings 721 may be formed at both opposite ends. The first wall portion 111 is a wall portion of the housing 1 arranged opposite to the partition device 7 along the first direction X. Taking the housing 1 as a rectangular parallelepiped as an example, any one of the length direction, width direction and thickness direction of the battery cell 10 may be parallel to the first direction X, that is, the first wall portion 111 may be a wall portion of the housing 1 in the length direction of the battery cell 10, or a wall portion of the housing 1 in the width direction of the battery cell 10, or a wall portion of the housing 1 in the thickness direction of the battery cell 10.

[0222] The end cover 12 may be used as the first wall portion 111, or a wall portion in the housing 11 may be used as the first wall portion 111. In the embodiment where a wall portion in the housing 11 is used as the first wall portion 111, the wall portion of the housing 11 opposite to the end cover 12 may be used as the first wall portion 111, or the wall portion of the housing 11 adjacent to the end cover 12 may be used as the first wall portion 111. As an example, in Fig.15 In the embodiment, a wall portion of the housing 11 adjacent to the end cover 12 is a first wall portion 111 , the first direction X is parallel to the thickness direction of the battery cell 10 , and the first wall portion 111 is located in the thickness direction of the battery cell 10 .

[0223] The opening 1112 on the outer surface 1111 of the first wall is the entrance for the heat management component 8 to enter the accommodating cavity 711. The heat management component 8 can enter the accommodating cavity 711 from the opening 1112. The opening 1112 on the outer surface 1111 of the first wall can correspond to the partition wall 71 one by one. The receiving unit 72 and the first wall 111 can be connected so that the second opening 721 is not connected to the accommodating space 13 of the housing 1; the receiving unit 72 and the second wall 112 can also be spaced apart along the first direction X so that there is a distance between the partition wall 71 and the first wall 111; the receiving unit 72 and the first wall 111 can also only keep in contact, and the two are not fixed.

[0224] In this embodiment, since the thermal management component 8 is disposed in the accommodating cavity 711 of the partition wall 71, the space inside the partition wall 71 can be fully utilized. When the temperature management of the electrode assembly 2 is achieved, the space inside the housing 1 occupied by the thermal management component 8 is reduced, and more space is freed up for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10. In addition, since the outer surface 1111 of the first wall portion is provided with a mouth 1112 communicating with the accommodating cavity 711, the thermal management component 8 can enter the accommodating cavity 711 from the outside of the housing 1 through the mouth 1112. When installing or removing the thermal management component 8, there is no need to open the housing 1, and the operation is more convenient.

[0225] In some embodiments, please refer to Fig.11 The electrode assembly 2 may include a main body 23, a first electrode tab 21 and a second electrode tab 22, the first electrode tab 21 and the second electrode tab 22 have opposite polarities, and the first electrode tab 21 and the second electrode tab 22 are respectively arranged at two opposite ends of the main body 23 along the first direction X, and the two opposite ends of the receiving unit 72 along the first direction X are both provided with a second opening 721 for the electrode assembly 2 to enter the subspace 131. The battery cell 10 includes a first current collecting member 5 and a second current collecting member 6, and the first current collecting member 5 and the second current collecting member 6 are respectively arranged at two opposite sides of the main body 23 along the first direction X, and the first current collecting member 5 connects the first electrode tabs 21 of the plurality of electrode assemblies 2, and the second current collecting member 6 connects the second electrode tabs 22 of the plurality of electrode assemblies 2.

[0226] The first pole tab 21 and the second pole tab 22 are respectively disposed at two opposite ends of the main body 23 along the first direction X, one of the first pole tab 21 and the second pole tab 22 is a positive pole tab, and the other is a negative pole tab. The receiving unit 72 is provided with second openings 721 at both opposite ends along the first direction X, and the second openings 721 are communicated with the subspace 131, and the first pole tab 21 and the second pole tab 22 can pass through the two second openings 721 and be connected to the first current collecting member 5 and the second current collecting member 6 respectively.

[0227] The first current collecting member 5 and the second current collecting member 6 are both located in the accommodation space 13, and the first current collecting member 5 and the second current collecting member 6 are respectively located on opposite sides of the main body 23 along the first direction X, so as to be respectively connected to the first pole tab 21 and the second pole tab 22 located at opposite ends of the main body 23. The first current collecting member 5 and the second current collecting member 6 are also respectively located on opposite sides of the partition device 7 along the first direction X. The first pole tabs 21 of all electrode assemblies 2 are connected to the first current collecting member 5, and the second pole tabs 22 of all electrode assemblies 2 are connected to the second current collecting member 6. The first pole tab 21 and the first current collecting member 5 can be connected in a variety of ways to achieve electrical connection between the first pole tab 21 and the first current collecting member 5, such as welding, conductive adhesive bonding, etc. The second pole tab 22 and the second current collecting member 6 can be connected in a variety of ways to achieve electrical connection between the second pole tab 22 and the second current collecting member 6, such as welding, conductive adhesive bonding, etc.

[0228] In this embodiment, the first pole tab 21 and the second pole tab 22 are respectively arranged at opposite ends of the main body 23 along the first direction X, and the first current collecting member 5 connected to the first pole tab 21 and the second current collecting member 6 connected to the second pole tab 22 are respectively arranged on opposite sides of the main body 23, which can reduce the risk of mutual interference and short circuit between the first current collecting member 5 and the second current collecting member 6. In addition, the first pole tabs 21 of the plurality of electrode assemblies 2 are connected by the first current collecting member 5 to achieve the convergence of the first pole tabs 21 of the plurality of electrode assemblies 2, and the second pole tabs 22 of the plurality of electrode assemblies 2 are connected by the second current collecting member 6 to achieve the convergence of the second pole tabs 22 of the plurality of electrode assemblies 2, without increasing the thickness or volume of a single electrode assembly 2, which can reduce the manufacturing difficulty of the large-capacity battery cell 10.

[0229] In some embodiments, please refer to Fig.11 The housing 1 may include a first wall portion 111 and a second wall portion 112. Along the first direction X, the first wall portion 111 and the second wall portion 112 are arranged opposite to each other. The first wall portion 111 is provided with one end of the first pole ear 21 facing the main body portion 23, and the second wall portion 112 is provided with one end of the second pole ear 22 facing the main body portion 23. The first wall portion 111 is provided with a first electrode terminal 3, and the second wall portion 112 is provided with a second electrode terminal 4. The first electrode terminal 3 and the second electrode terminal 4 are respectively connected to the first current collecting member 5 and the second current collecting member 6.

[0230] The second wall portion 112 is a wall portion in the housing 1 opposite to the first wall portion 111. In an embodiment in which the housing 11 is opened at one end, one of the second wall portion 112 and the first wall portion 111 may be the end cover 12, and the other may be the wall portion in the housing 11 opposite to the end cover 12, or the second wall portion 112 and the first wall portion 111 may be two opposite walls of the housing 11; in an embodiment in which the housing 11 is opened at both ends, the second wall portion 112 and the first wall portion 111 may be two opposite walls of the housing 11, or the second wall portion 112 and the first wall portion 111 may be two end covers 12. As an example, in Fig.11 In the embodiment, an opening is formed at one end of the shell 11 , and the first wall portion 111 and the second wall portion 112 are two opposite wall portions of the shell 11 .

[0231] The first electrode terminal 3 can be insulated and installed on the first wall portion 111, and the second electrode terminal 4 can be insulated and installed on the second wall portion 112. Along the first direction X, the first current collecting member 5 is located between the partition device 7 and the first wall portion 111, and the second current collecting member 6 is located between the partition device 7 and the second wall portion 112. The first current collecting member 5 and the first electrode terminal 3 can be connected in a variety of ways to achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3, such as welding, conductive adhesive bonding, etc. The second current collecting member 6 and the second electrode terminal 4 can be connected in a variety of ways to achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4, such as welding, conductive adhesive bonding, etc.

[0232] In this embodiment, the first wall portion 111 is disposed at one end of the first pole tab 21 facing the main body portion 23, the first electrode terminal 3 is disposed at the first wall portion 111, and the first current collecting member 5 connects the first electrode terminal 3 and the first pole tab 21, so that the distance between the first electrode terminal 3 and the first pole tab 21 can be reduced, the size of the first current collecting member 5 can be reduced, and the current flow path from the first pole tab 21 to the first electrode terminal 3 can be reduced. The second wall portion 112 is disposed at one end of the second pole tab 22 facing the main body portion 23, the second electrode terminal 4 is disposed at the second wall portion 112, and the second current collecting member 6 connects the second electrode terminal 4 and the second pole tab 22, so that the distance between the second electrode terminal 4 and the second pole tab 22 can be reduced, the size of the second current collecting member 6 can be reduced, and the current flow path from the second pole tab 22 to the second electrode terminal 4 can be reduced.

[0233] In some embodiments, please refer to Fig.16 , Fig.16An exploded view of a battery cell 10 (electrode assembly 2 is cylindrical) provided for other embodiments of the present application. The housing 1 includes a first wall portion 111, a second wall portion 112 and a third wall portion 113. Along the first direction X, the first wall portion 111 is arranged opposite to the second wall portion 112, the third wall portion 113 connects the first wall portion 111 and the second wall portion 112, and the third wall portion 113 is provided with a first electrode terminal 3 and a second electrode terminal 4. Among them, the first current collecting member 5 is provided with a first extension portion 53, and the second current collecting member 6 is provided with a second extension portion 63. Along the second direction Y, the first extension portion 53 and the second extension portion 63 are both located between the main body 23 and the third wall portion 113, and the first extension portion 53 and the second extension portion 63 are respectively connected to the first electrode terminal 3 and the second electrode terminal 4, and the second direction Y intersects with the first direction X.

[0234] The third wall portion 113 is a wall portion in the housing 1 that connects the second wall portion 112 and the first wall portion 111 and is located in the second direction Y. The first wall portion 111 and the second wall portion 112 are both adjacent to the third wall portion 113. If the first wall portion 111 and the second wall portion 112 are two opposite walls in the housing 11, the third wall portion 113 may be a wall portion in the housing 11 that connects the first wall portion 111 and the second wall portion 112, or the third wall portion 113 may be an end cover 12 that connects the first wall portion 111 and the second wall portion 112.

[0235] The first extension portion 53 may be a sheet-like structure connected to the first current collecting member 5. The first extension portion 53 may be connected to one end of the first current collecting member 5 facing the third wall portion 113 along the second direction Y. The angle between the first extension portion 53 and the first current collecting member 5 may be an acute angle, a right angle, an obtuse angle, etc. Along the second direction Y, the first extension portion 53 is located between the main body 23 and the third wall portion 113. It can be understood that along the second direction Y, the first extension portion 53 is located between the third wall portion 113 and each main body 23, that is, along the second direction Y, the main body 23 of all electrode assemblies 2 is located on the side of the first extension portion 53 away from the third wall portion 113. The first extension portion 53 and the first electrode terminal 3 may be connected in a variety of ways to achieve electrical connection between the first current collecting member 5 and the first electrode terminal 3, such as welding, conductive adhesive bonding, etc.

[0236] The second extension portion 63 may be a sheet-like structure connected to the second current collecting member 6. The second extension portion 63 may be connected to one end of the second current collecting member 6 facing the third wall portion 113 along the second direction Y. The angle between the second extension portion 63 and the second current collecting member 6 may be an acute angle, a right angle, an obtuse angle, etc. Along the second direction Y, the second extension portion 63 is located between the main body 23 and the third wall portion 113. It can be understood that along the second direction Y, the second extension portion 63 is located between the third wall portion 113 and each main body 23, that is, along the second direction Y, the main body 23 of all electrode assemblies 2 is located on the side of the second extension portion 63 away from the third wall portion 113. The second extension portion 63 and the second electrode terminal 4 may be connected in a variety of ways to achieve electrical connection between the second current collecting member 6 and the second electrode terminal 4, such as welding, conductive adhesive bonding, etc.

[0237] The first electrode terminal 3 and the second electrode terminal 4 are both disposed on the third wall portion 113. The first electrode terminal 3 and the second electrode terminal 4 can be arranged along the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other and are not coplanar. Any two of the first direction X, the second direction Y and the third direction Z can be arranged at an acute angle, a right angle or an obtuse angle. Taking the first direction X, the second direction Y and the third direction Z as an example, one of the first direction X, the second direction Y and the third direction Z can be parallel to the length direction of the battery cell 10, another can be parallel to the width direction of the battery cell 10, and another can be parallel to the thickness direction of the battery cell 10.

[0238] In the present embodiment, the first electrode terminal 3 and the second electrode terminal 4 are arranged on the third wall portion 113 connected to the first wall portion 111 and the second wall portion 112, so that the first electrode terminal 3 and the second electrode terminal 4 are not arranged on the first wall portion 111 and the second wall portion 112, so that the plurality of battery cells 10 are not easily affected by the first electrode terminal 3 and the second electrode terminal 4 when stacked along the first direction X, so that the plurality of battery cells 10 can be closely stacked along the first direction X. In addition, the first current collecting member 5 is provided with a first extension portion 53, the first extension portion 53 is located between the main body portion 23 and the third wall portion 113, and the first extension portion 53 is connected to the first electrode terminal 3, so that the connection area between the first current collecting member 5 and the first pole tab 21 and the connection area between the first extension portion 53 and the first electrode terminal 3 can be further apart, thereby reducing the risk of mutual influence, and facilitating reducing the difficulty of connecting the first current collecting member 5, the first pole tab 21 and the first electrode terminal 3. The second current collecting member 6 is provided with a second extension portion 63, which is located between the main body portion 23 and the third wall portion 113, and is connected to the second electrode terminal 4, so that the connection area between the second current collecting member 6 and the second electrode tab 22 and the connection area between the second extension portion 63 and the second electrode terminal 4 can be farther away, thereby reducing the risk of mutual influence, which is conducive to reducing the difficulty of connecting the second current collecting member 6, the second electrode tab 22 and the second electrode terminal 4.

[0239] In some embodiments, please refer to Fig.16 , a second opening 721 for the electrode assembly 2 to enter the subspace 131 is formed at at least one end of the receiving unit 72 along the first direction X. The housing 1 includes a shell 11 and an end cover 12. A first opening 114 is formed at at least one end of the shell 11 along the second direction Y. The end cover 12 corresponds to the first opening 114 one by one. The end cover 12 covers the first opening 114. The second direction Y intersects with the first direction X.

[0240] Along the first direction X, the receiving unit 72 may have a second opening 721 formed at one end, or may have second openings 721 formed at both opposite ends. Along the second direction Y, the housing 11 may have a first opening 114 formed at one end, or may have first openings 114 formed at both opposite ends. The second direction Y may be arranged at an acute angle, a right angle, or an obtuse angle with the first direction X.

[0241] As an example, the receiving unit 72 is formed with a second opening 721 at both ends along the first direction X, the housing 11 is formed with a first opening 114 at one end along the second direction Y, and there is one end cover 12, which is correspondingly covered with the first opening 114 of the housing 11 to close the first opening 114. The second direction Y is perpendicular to the first direction X.

[0242] In this embodiment, the receiving unit 72 is provided with a second opening 721, and the electrode assembly 2 can enter the receiving unit 72 through the second opening 721, which is convenient for installing the electrode assembly 2. The second opening 721 of the receiving unit 72 is in the first direction X, and the first opening 114 of the shell 11 is in the second direction Y. The first direction X intersects with the second direction Y, so that the shell 11 can cover the second opening 721 of the receiving unit 72 to restrict the electrode assembly 2 in the receiving unit 72. Even if the end cover 12 is not covered with the first opening 114, the electrode assembly 2 is not easy to be separated from the receiving unit 72 from the second opening 721.

[0243] In some embodiments, please refer to Fig.17 , Fig.17 Exploded view of a battery cell 10 (electrode assembly 2 is cylindrical) provided in some other embodiments of the present application. A second opening 721 for the electrode assembly 2 to enter the subspace 131 is formed at at least one end of the receiving unit 72 along the first direction X. The housing 1 includes a shell 11 and an end cover 12. The shell 11 has a first opening 114 formed at one end along the first direction X and at one end along the second direction Y. The end cover 12 corresponds to the first opening 114 one by one. The end cover 12 covers the first opening 114. The second direction Y intersects with the first direction X.

[0244] In this embodiment, there are two end covers 12 in the housing 1, and the two end covers 12 respectively close the two first openings 114 of the housing 11, and the two end covers 12 are arranged adjacent to each other. In this way, the partition device 7 can be installed in the housing 1 through any one of the two first openings 114 according to needs.

[0245] In some embodiments, please refer to Fig.16 and Fig.17 At least one wall portion of the housing 1 disposed opposite to the partition device 7 along the first direction X is the wall portion of the housing 1 with the largest outer surface area.

[0246] Taking the case 1 as a rectangular parallelepiped, the case 1 has two walls arranged opposite to the partition device 7 along the first direction X. Only one of the two walls may be the wall with the largest outer surface area in the case 1, or both of them may be the wall with the largest outer surface area in the case 1. The wall with the largest outer surface area in the case 1 is the wall of the case 1 in the thickness direction of the battery cell 10. The wall with the largest outer surface area in the case 1 may be the wall in the shell 11 or the end cover 12. Fig.16 and Fig.17 In the embodiment, the first wall portion 111 and / or the second wall portion 112 in the housing 1 can be used as the wall portion with the largest outer surface area in the housing 1. The outer surface area of ​​the second wall portion 112 can be equal to the outer surface area of ​​the first wall portion 1111. Fig.16In the illustrated embodiment, a wall portion of the housing 11 located in the thickness direction of the battery cell 10 is the wall portion of the housing 1 with the largest outer surface area; Fig.17 In the illustrated embodiment, one end cover 12 in the housing 1 located in the thickness direction of the battery cell 10 is the wall portion of the housing 1 having the largest outer surface area.

[0247] In this embodiment, a second opening 721 is formed at at least one end of the receiving unit 72 along the first direction X, and the electrode assembly 2 can enter the receiving unit 72 along the first direction X from the second opening 721. Since at least one wall portion of the outer shell 1 arranged opposite to the partition device 7 along the first direction X is the wall portion with the largest outer surface area in the outer shell 1, and the wall portion with the largest outer surface area in the outer shell 1 is located in the first direction X, the direction of the second opening 721 is basically vertical to the wall portion with the largest outer surface area in the outer shell 1. In this way, more receiving units 72 can be arranged in the receiving space 13 of the outer shell 1 to accommodate more electrode assemblies 2.

[0248] In some embodiments, please refer to Fig.16 and Fig.17 As shown, along the first direction X, the accommodating space 13 accommodates only one accommodating unit 72; along the second direction Y, the accommodating space 13 accommodates multiple accommodating units 72; along the third direction Z, the accommodating space 13 accommodates multiple accommodating units 72, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect with each other.

[0249] As an example, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, the first direction X is parallel to the thickness direction of the battery cell 10 , the second direction Y is parallel to the length direction of the battery cell 10 , and the third direction Z is parallel to the width direction of the battery cell 10 .

[0250] In this embodiment, the accommodating space 13 only accommodates one accommodating unit 72 along the first direction X, and the accommodating space 13 accommodates multiple accommodating units 72 along the second direction Y and the third direction Z. Without making the size of the shell 1 along the first direction X too large, the accommodating space 13 can accommodate more accommodating units 72 to accommodate more electrode assemblies 2, which is conducive to realizing a large-capacity battery cell 10.

[0251] In some embodiments, please refer to Fig.18 , Fig.18 An exploded view of a battery cell 10 (electrode assembly 2 is cylindrical) provided in some embodiments of the present application. At least one wall portion of the housing 1 arranged opposite to the separator 7 along the third direction Z is the wall portion of the housing 1 with the largest outer surface area, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other.

[0252] Taking the case 1 as a rectangular parallelepiped, the case 1 has two wall portions arranged opposite to the partition device 7 along the third direction Z, and only one of the two wall portions may be the wall portion with the largest outer surface area in the case 1, or both of the two wall portions may be the wall portion with the largest outer surface area in the case 1. The wall portion with the largest outer surface area in the case 1 is the wall portion of the case 1 in the thickness direction of the battery cell 10. The wall portion with the largest outer surface area in the case 1 may be a wall portion in the housing 11, or may be the end cover 12.

[0253] As an example, in Fig.18 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, the first direction X is parallel to the width direction of the battery cell 10, the second direction Y is parallel to the length direction of the battery cell 10, and the third direction Z is parallel to the thickness direction of the battery cell 10. The wall portion with the largest outer surface area in the housing 1 is the wall portion in the housing 11 in the thickness direction of the battery cell 10, the wall portion with the largest outer surface area in the housing 1 connects the first wall portion 111 and the second wall portion 112, the third wall portion 113 is the end cap 12, and the first electrode terminal 3 and the second electrode terminal 4 are arranged on the third wall portion 113.

[0254] In this embodiment, a second opening 721 is formed at at least one end of the receiving unit 72 along the first direction X, and the electrode assembly 2 can enter the receiving unit 72 along the first direction X from the second opening 721. Since at least one wall portion of the outer shell 1 arranged opposite to the partition device 7 along the third direction Z is the wall portion with the largest outer surface area in the outer shell 1, and the wall portion with the largest outer surface area in the outer shell 1 is located in the third direction Z, the direction of the second opening 721 is basically parallel to the wall portion with the largest outer surface area in the outer shell 1. The outer shell 1 can provide more space for the receiving unit 72 in the first direction X to increase the size of the receiving unit 72 in the first direction X.

[0255] In some embodiments, please refer to Fig.18 Along the first direction X, the accommodating space 13 accommodates only one accommodating unit 72 ; along the second direction Y, the accommodating space 13 accommodates a plurality of accommodating units 72 ; along the third direction Z, the accommodating space 13 accommodates only one accommodating unit 72 .

[0256] In this embodiment, the accommodating space 13 only accommodates one accommodating unit 72 along the first direction X and the third direction Z, and the accommodating space 13 accommodates multiple accommodating units 72 along the second direction Y. Under the condition that the size of the shell 1 along the first direction X and the size of the third direction Z are not too large, the accommodating space 13 can accommodate more accommodating units 72 to accommodate more electrode assemblies 2, which is conducive to realizing a large-capacity battery cell 10.

[0257] In some embodiments, please refer to Figure 16-Figure 18The electrode assembly 2 is cylindrical, and each subspace 131 only accommodates one electrode assembly 2.

[0258] In this embodiment, the electrode assembly 2 is cylindrical, and each subspace 131 accommodates only one electrode assembly 2. Each electrode assembly 2 is limited by the separator 7, which reduces the expansion stress accumulation of two adjacent electrode assemblies 2. In addition, after one electrode assembly 2 is accommodated in one subspace 131, each subspace 131 can play a certain limiting role on the corresponding electrode assembly 2, reducing the risk of the electrode assembly 2 tilting and shaking.

[0259] In some embodiments, the partition device 7 includes a partition wall 71 configured to separate two adjacent subspaces 131 , and an accommodation cavity 711 is formed inside the partition wall 71 . The battery cell 10 further includes a thermal management component 8 , which is accommodated in the accommodation cavity 711 .

[0260] In this embodiment, the accommodating cavity 711 may be a closed structure or an open structure.

[0261] In the present embodiment, a accommodating cavity 711 is formed inside the partition wall 71, and the thermal management component 8 is disposed in the accommodating cavity 711 of the partition wall 71, so that the space inside the partition wall 71 is fully utilized. While achieving temperature management of the electrode assembly 2, the space occupied by the thermal management component 8 inside the outer shell 1 is reduced, thereby freeing up more space for the electrode assembly 2, which is beneficial to improving the volume energy density of the battery cell 10.

[0262] In some embodiments, the outer surface of the housing 1 is provided with an opening 1112 for the heat management component 8 to enter the accommodating cavity 711 , and the opening 1112 is in communication with the accommodating cavity 711 .

[0263] In this embodiment, the mouth 1112 can be provided on the outer surface of the housing 11, or on the outer surface of the end cover 12, and the mouth 1112 can correspond to the partition wall one by one. It should be noted that in the embodiment where the partition wall 71 is connected to the first wall 111 of the housing 1, the mouth 1112 can be provided on the outer surface 1111 of the first wall, or on the outer surface of the second wall 112 opposite to the first wall 111.

[0264] In this embodiment, the outer surface of the shell 1 is provided with a mouth 1112 connected to the accommodating cavity 711. The thermal management component 8 can enter the accommodating cavity 711 through the mouth 1112 from the outside of the shell 1. When installing or removing the thermal management component 8, there is no need to open the shell 1, which makes the operation more convenient.

[0265] In some embodiments, the housing 1 is in a rectangular parallelepiped shape. The multiple electrode assemblies 2 can fully utilize the internal space of the housing 1, improve the space utilization of the electrode assemblies 2, and facilitate the realization of a large-capacity battery cell 10.

[0266] An embodiment of the present application provides a battery 100, comprising a battery cell 10 provided in any one of the above embodiments.

[0267] An embodiment of the present application provides an electrical device, including a battery cell 10 provided by any one of the above embodiments, and the battery cell 10 is used to provide electrical energy to the electrical device.

[0268] An embodiment of the present application provides an energy storage device, comprising a battery cell 10 provided in any one of the above embodiments.

[0269] Among them, the energy storage device can be a container, an energy storage cabinet, etc.

[0270] Please refer to Figure 4-Figure 8 The embodiment of the present application also provides a battery cell 10, which includes a housing 1, a separator 7, a first current collecting member 5, a second current collecting member 6, a first electrode terminal 3, a second electrode terminal 4 and a plurality of electrode assemblies 2. The housing 1 has a housing space 13, and a plurality of electrode assemblies 2 are accommodated in the housing space 13. The housing 1 includes a shell 11 and an end cover 12, the shell 11 has a first opening 114, and the end cover 12 covers the first opening 114. The electrode assembly 2 is a flat device, and the electrode assembly 2 includes a main body 23, a first pole ear 21, and a second pole ear 22. The first pole ear 21 and the second pole ear 22 are arranged at the same end of the main body 23 along the first direction X. Along the first direction X, the housing 1 has a first wall portion 111 and a second wall portion 112 opposite to each other. The partition device 7 includes a plurality of partition walls 71, which are connected to the first wall portion 111 and are arranged at intervals along the second direction Y. The plurality of partition walls 71 divide the accommodation space 13 into a plurality of subspaces 131, and each partition wall 71 is configured to separate two adjacent subspaces 131, and each subspace 131 accommodates one or more electrode assemblies 2. The first current collecting member 5 and the second current collecting member 6 are arranged on the side of the main body 23 away from the first wall portion 111, the first current collecting member 5 connects the first pole tabs 21 of the plurality of electrode assemblies 2, and the second current collecting member 6 connects the second pole tabs 22 of the electrode assemblies 2. The first current collecting member 5 and the second current collecting member 6 are arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The first electrode terminal 3 and the second electrode terminal 4 are both arranged on the second wall portion 112, and the first electrode terminal 3 and the second electrode terminal 4 are connected to the first current collecting member 5 and the second current collecting member 6, respectively, and the first electrode terminal 3 and the second electrode terminal 4 are arranged along the third direction Z. The first wall portion 111 is the end cover 12 , or the first wall portion 111 is a wall portion of the housing 11 opposite to the end cover 12 .

[0271] Among them, the battery cell 10 also includes a thermal management component 8, a accommodating cavity 711 is formed inside the partition wall 71, and the thermal management component 8 is accommodated in the accommodating cavity 711. The outer surface 1111 of the first wall portion is provided with a mouth 1112 for the heat management component 8 to enter the accommodating cavity 711, and the mouth 1112 is connected to the accommodating cavity 711.

[0272] In such a battery cell 10, a partition device 7 is provided in the accommodation space 13 of the housing 1. The partition device 7 divides the accommodation space 13 into a plurality of subspaces 131. The partition device 7 plays a role in separating the electrode assemblies 2 in each subspace 131, so as to reduce the risk of expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 131, which leads to mutual compression and deformation of the electrode assemblies 2, and effectively improves the reliability of the battery cell 10. Since the thermal management component 8 is arranged in the accommodation cavity 711 of the partition wall 71, the space inside the partition wall 71 is fully utilized. When the temperature management of the electrode assembly 2 is achieved, the space occupied by the thermal management component 8 inside the housing 1 is reduced, and more space is freed for the electrode assembly 2, which is conducive to improving the volume energy density of the battery cell 10. In addition, since the outer surface 1111 of the first wall portion is provided with a mouth 1112 communicating with the accommodation cavity 711, the thermal management component 8 can enter the accommodation cavity 711 from the outside of the housing 1 through the mouth 1112. When installing and removing the thermal management component 8, there is no need to open the housing 1, and the operation is more convenient.

[0273] Please refer to Figure 16-Figure 18The embodiment of the present application also provides a battery cell 10, which includes a housing 1, a separator 7, a first current collecting member 5, a second current collecting member 6, a first electrode terminal 3, a second electrode terminal 4 and a plurality of electrode assemblies 2. The housing 1 has a housing space 13, and a plurality of electrode assemblies 2 are accommodated in the housing space 13. The housing 1 includes a shell 11 and an end cover 12, the shell 11 has a first opening 114, and the end cover 12 covers the first opening 114. The electrode assembly 2 is cylindrical, and the electrode assembly 2 includes a main body 23, a first pole ear 21, and a second pole ear 22. The first pole ear 21 and the second pole ear 22 are arranged at opposite ends of the main body 23 along the first direction X. The housing 1 has a first wall portion 111, a second wall portion 112 and a third wall portion 113, the first wall portion 111 and the second wall portion 112 are arranged opposite to each other along the first direction X, and the third wall portion 113 connects the first wall portion 111 and the second wall portion 112. The partition device 7 is accommodated in the accommodation space 13. The partition device 7 includes a plurality of receiving units 72. A subspace 131 is formed inside each receiving unit 72. Each subspace 131 accommodates one or more electrode assemblies 2. Two adjacent receiving units 72 share a partition wall 71. Along the first direction X, the receiving units 72 have second openings 721 formed at opposite ends thereof. Along the first direction X, the first current collecting member 5 and the second current collecting member 6 are respectively arranged on opposite sides of the main body 23. The first current collecting member 5 is connected to the first pole tabs 21 of the plurality of electrode assemblies 2. The second current collecting member 6 is connected to the second pole tabs 22 of the plurality of electrode assemblies 2. The first pole tab 21 passes through a second opening 721 of the receiving unit 72 and is connected to the first current collecting member 5. The second pole tab 22 passes through another second opening 721 of the receiving unit 72 and is connected to the second current collecting member 6. The first electrode terminal 3 and the second electrode terminal 4 are arranged on the third wall. The first current collecting member 5 is provided with a first extension portion 53, and the second current collecting member 6 is provided with a second extension portion 63. Along the second direction Y, the first extension portion 53 and the second extension portion 63 are both located between the main body portion 23 and the third wall portion 113, and the first extension portion 53 and the second extension portion 63 are respectively connected to the first electrode terminal 3 and the second electrode terminal 4. The first electrode terminal 3 and the second electrode terminal 4 are arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0274] Among them, the battery cell 10 also includes a thermal management component 8, a accommodating cavity 711 is formed inside the partition wall 71, and the thermal management component 8 is accommodated in the accommodating cavity 711. The outer surface 1111 of the first wall portion is provided with a mouth 1112 for the heat management component 8 to enter the accommodating cavity 711, and the mouth 1112 is connected to the accommodating cavity 711.

[0275] In such a battery cell 10, a partition device 7 is provided in the accommodation space 13 of the housing 1, and a plurality of subspaces 131 are formed inside the partition device 7. The partition device 7 plays a role in separating the electrode assemblies 2 in each subspace 131, so as to reduce the risk of expansion stress accumulation of the electrode assemblies 2 in adjacent subspaces 131, which leads to mutual compression and deformation of the electrode assemblies 2, and effectively improves the reliability of the battery cell 10. Since the thermal management component 8 is arranged in the accommodation cavity 711 of the partition wall 71, the space inside the partition wall 71 is fully utilized. Under the condition of achieving temperature management of the electrode assembly 2, the space occupied by the thermal management component 8 inside the housing 1 is reduced, and more space is freed for the electrode assembly 2, which is conducive to improving the volume energy density of the battery cell 10. In addition, since the outer surface 1111 of the first wall portion is provided with a mouth 1112 communicating with the accommodation cavity 711, the thermal management component 8 can enter the accommodation cavity 711 from the outside of the housing 1 through the mouth 1112. When installing and removing the thermal management component 8, there is no need to open the housing 1, and the operation is more convenient.

[0276] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0277] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, It is characterized in that include: A housing having a receiving space; A plurality of electrode assemblies are accommodated in the accommodation space; The partition device is arranged in the accommodating space, and is configured to divide the accommodating space into a plurality of sub-spaces, each of which accommodates at least one electrode assembly.

2. The battery cell according to claim 1, It is characterized in that The partition device includes at least one partition wall, which is disposed in the accommodating space and connected to the housing, and is configured to separate two adjacent sub-spaces.

3. The battery cell according to claim 2, It is characterized in that The partition device includes a plurality of partition walls, and the plurality of partition walls are arranged at intervals in the accommodation space.

4. The battery cell according to claim 3, It is characterized in that The housing includes a first wall portion, and the plurality of partition walls are connected to the first wall portion.

5. The battery cell according to claim 4, It is characterized in that The battery cell further includes a heat management component. A receiving cavity is formed inside the partition wall. The heat management component is received in the receiving cavity. An opening for the heat management component to enter the receiving cavity is provided on the outer surface of the first wall portion. The opening is communicated with the receiving cavity.

6. The battery cell according to claim 4, It is characterized in that The first wall portion is a wall portion of the housing having the largest outer surface area.

7. The battery cell according to claim 4, It is characterized in that The electrode assembly comprises a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab have opposite polarities, are arranged at one end of the main body away from the first wall along a first direction, and a plurality of partition walls are arranged at intervals along a second direction, and the first direction intersects with the second direction; The battery cell includes a first current collecting member and a second current collecting member. Along the first direction, the first current collecting member and the second current collecting member are arranged on a side of the main body away from the first wall portion. The first current collecting member connects the first pole tabs of the plurality of electrode assemblies, and the second current collecting member connects the second pole tabs of the plurality of electrode assemblies.

8. The battery cell according to claim 7, It is characterized in that The housing includes a second wall portion, which is arranged opposite to the first wall portion along the first direction, and the second wall portion is provided with a first electrode terminal and a second electrode terminal, which are respectively connected to the first current collecting member and the second current collecting member.

9. The battery cell according to claim 7, It is characterized in that The housing comprises a second wall portion and a third wall portion, the first wall portion is arranged opposite to the second wall portion along the first direction, the third wall portion connects the first wall portion and the second wall portion, and the third wall portion is provided with a first electrode terminal and a second electrode terminal; The first current collecting member is provided with a first extension portion, and the second current collecting member is provided with a second extension portion. Along the second direction, the first extension portion and the second extension portion are both located between the main body portion and the third wall portion, and the first extension portion and the second extension portion are respectively connected to the first electrode terminal and the second electrode terminal.

10. The battery cell according to claim 4, It is characterized in that The housing comprises: A housing having a first opening; an end cover, covering the first opening; Wherein, the end cover is the first wall portion; or, the wall portion of the shell body opposite to the end cover is the first wall portion.

11. The battery cell according to claim 2, It is characterized in that The electrode assembly is flat, and a plurality of the subspaces are arranged along the thickness direction of the electrode assembly.

12. The battery cell according to claim 11, It is characterized in that Each of the subspaces accommodates a plurality of the electrode assemblies, and the plurality of the electrode assemblies in each of the subspaces are stacked along a thickness direction of the electrode assembly.

13. The battery cell according to claim 1, It is characterized in that The subspace is formed inside the partitioning device.

14. The battery cell according to claim 13, It is characterized in that The partition device comprises a plurality of receiving units arranged in the accommodating space, and a subspace is formed inside each of the receiving units.

15. The battery cell according to claim 14, It is characterized in that Two adjacent storage units share a partition wall, and the partition wall is configured to separate the subspaces of the two adjacent storage units.

16. The battery cell according to claim 15, It is characterized in that The battery cell further includes a heat management component, a receiving cavity is formed inside the partition wall, and the heat management component is received in the receiving cavity; In which, a second opening for the electrode assembly to enter the subspace is formed at at least one end of the containing unit along the first direction, and along the first direction, the outer shell includes a first wall portion arranged opposite to the partition device, and the outer surface of the first wall portion is provided with a mouth portion for the thermal management component to enter the containing cavity, and the mouth portion is connected to the containing cavity.

17. The battery cell according to claim 14, It is characterized in that The electrode assembly comprises a main body, a first pole ear and a second pole ear, wherein the first pole ear and the second pole ear have opposite polarities, and the first pole ear and the second pole ear are respectively arranged at two opposite ends of the main body along a first direction, and along the first direction, two opposite ends of the receiving unit are both provided with a second opening for the electrode assembly to enter the subspace; The battery cell includes a first current collecting member and a second current collecting member. Along the first direction, the first current collecting member and the second current collecting member are respectively arranged on opposite sides of the main body. The first current collecting member connects the first pole tabs of the plurality of electrode assemblies, and the second current collecting member connects the second pole tabs of the plurality of electrode assemblies.

18. The battery cell according to claim 17, It is characterized in that The shell includes a first wall portion and a second wall portion. The first wall portion and the second wall portion are arranged opposite to each other along the first direction. The first wall portion is provided with one end of the first pole ear facing the main body, and the second wall portion is provided with one end of the second pole ear facing the main body. The first wall portion is provided with a first electrode terminal, and the second wall portion is provided with a second electrode terminal. The first electrode terminal and the second electrode terminal are respectively connected to the first current collecting component and the second current collecting component.

19. The battery cell according to claim 17, It is characterized in that The housing comprises a first wall portion, a second wall portion and a third wall portion, wherein the first wall portion is arranged opposite to the second wall portion along the first direction, the third wall portion connects the first wall portion and the second wall portion, and the third wall portion is provided with a first electrode terminal and a second electrode terminal; Among them, the first current collecting member is provided with a first extension portion, and the second current collecting member is provided with a second extension portion. Along the second direction, the first extension portion and the second extension portion are both located between the main body portion and the third wall portion, the first extension portion and the second extension portion are respectively connected to the first electrode terminal and the second electrode terminal, and the second direction intersects with the first direction.

20. The battery cell according to claim 14, It is characterized in that A second opening for the electrode assembly to enter the subspace is formed at at least one end of the receiving unit along the first direction; The housing includes a shell and an end cover. The shell is provided with a first opening at at least one end along the second direction. The end cover corresponds to the first opening one by one and covers the first opening. The second direction intersects with the first direction.

21. The battery cell according to claim 20, It is characterized in that At least one wall portion of the shell disposed opposite to the partition device along the first direction is a wall portion of the shell with the largest outer surface area.

22. The battery cell according to claim 21, It is characterized in that Along the first direction, the accommodating space accommodates only one accommodating unit; Along the second direction, the accommodation space accommodates a plurality of the accommodation units; Along the third direction, the accommodating space accommodates a plurality of the accommodating units, and the first direction, the second direction and the third direction are not coplanar and intersect with each other.

23. The battery cell according to claim 20, It is characterized in that At least one wall portion of the shell arranged opposite to the partition device along the third direction is the wall portion of the shell with the largest outer surface area, and the first direction, the second direction and the third direction are not coplanar and intersect each other.

24. The battery cell according to claim 23, It is characterized in that Along the first direction, the accommodating space accommodates only one accommodating unit; Along the second direction, the accommodation space accommodates a plurality of the accommodation units; Along the third direction, the accommodating space only accommodates one accommodating unit.

25. The battery cell according to claim 13, It is characterized in that The electrode assembly is cylindrical, and each of the subspaces accommodates only one electrode assembly.

26. The battery cell according to any one of claims 1 to 25, It is characterized in that The partition device comprises a partition wall, the partition wall is configured to separate two adjacent sub-spaces, and a receiving cavity is formed inside the partition wall; The battery cell further includes a heat management component, and the heat management component is accommodated in the accommodation cavity.

27. The battery cell according to claim 26, It is characterized in that The outer surface of the housing is provided with an opening for the heat management component to enter the accommodating cavity, and the opening is communicated with the accommodating cavity.

28. The battery cell according to any one of claims 1 to 25, It is characterized in that The shell is in a rectangular parallelepiped shape.

29. A battery, It is characterized in that Comprising the battery cell according to any one of claims 1-28.

30. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 28, wherein the battery cell is used to provide electrical energy to the electrical device.

31. An energy storage device, It is characterized in that Comprising the battery cell according to any one of claims 1-28.

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