Battery cell, related device, energy storage system and charging network

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery monomer, a related device, an energy storage system and a charging network, the related device comprises a battery device, an energy storage device and a power utilization device, and the battery monomer comprises a shell, an electrode assembly and a heat conduction piece. The electrode assembly comprises a main body part and a tab connected to the main body part, and the main body part and the tab are both arranged in the shell. The heat conduction piece is arranged in the shell and at least partially surrounds the periphery of the main body part. The thermal conductivity of the heat conduction piece is larger than that of the shell. By arranging the heat conduction piece, the speed of diffusing heat in the main body part to the shell to be released can be increased, so that the temperature difference between the interior of the main body part and the shell can be effectively reduced, the heat dissipation performance of the battery monomer is improved, and the use performance and the service life of the battery monomer are favorably improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and more particularly relates to a battery monomer, a related device, an energy storage system, and a charging network. BACKGROUND

[0002] In the related art, a battery monomer can include a shell and an electrode assembly disposed in the shell.

[0003] In some cases, a battery monomer can generate a large amount of heat during operation, causing the electrode assembly to accumulate a large amount of heat inside. This can easily cause a large temperature difference between the inside of the electrode assembly and the shell, thereby affecting the use performance and service life of the battery monomer. SUMMARY

[0004] In view of the above problems, the embodiments of the present application provide a battery monomer, a related device, an energy storage system, and a charging network, which can reduce the temperature difference between the inside of the electrode assembly and the shell of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0006] a shell;

[0007] an electrode assembly including a main body portion and a tab connected to the main body portion, both of which are disposed in the shell;

[0008] a heat-conducting member disposed in the shell and at least partially surrounding the outer periphery of the main body portion, the heat-conducting member having a higher thermal conductivity than the shell.

[0009] The battery monomer provided by the embodiments of the present application has the heat-conducting member disposed in the shell of the battery monomer, the heat-conducting member has a higher thermal conductivity than the shell, and at least part of the heat-conducting member surrounds the outer periphery of the main body portion of the electrode assembly. This allows the heat on the main body portion to be efficiently conducted to the heat-conducting member and then to the shell through the heat-conducting member. This can accelerate the rate at which the heat inside the main body portion is diffused to the shell and then released, thereby effectively reducing the temperature difference between the inside of the main body portion and the shell, improving the heat dissipation performance of the battery monomer, and helping to improve the use performance and service life of the battery monomer.

[0010] In some embodiments, the electrode assembly has a winding structure with a winding axis, the main body portion has the tab at least at one end along the winding axis, and at least part of the heat-conducting member surrounds the outer periphery of the main body portion relative to the winding axis.

[0011] By at least partially surrounding the outer periphery of the main body portion relative to the winding axis, the heat conducting member and the main body portion have a relatively large relative area, so that the heat conducting member can better conduct the heat inside the main body portion to the outside. Also, the heat conducting member and the shell have a relatively large relative area, so that the heat conducting member can better conduct the heat to the shell. In this way, the temperature difference between the inside of the main body portion and the shell can be effectively reduced, and the use performance and service life of the battery cell can be improved.

[0012] In some embodiments, the number of heat conducting members and electrode assemblies is multiple, and at least part of each heat conducting member surrounds the outer periphery of the main body portion of each electrode assembly.

[0013] By at least partially surrounding the outer periphery of the main body portion of each electrode assembly, each heat conducting member can specifically conduct the heat inside the main body portion of each electrode assembly to the outside. Also, two layers of heat conducting members are arranged between the main body portions of two adjacent electrode assemblies, so that the heat between the main body portions of two adjacent electrode assemblies can be conducted to the outside. In this way, the heat conducting efficiency of the heat conducting member for the combined structure of multiple electrode assemblies can be improved, so that the temperature difference between the inside of the combined structure of multiple electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery cell can be improved.

[0014] In some embodiments, the number of electrode assemblies is multiple, and at least part of the heat conducting member surrounds the outer periphery of the main body portion of the multiple electrode assemblies.

[0015] In this way, the heat conducting member can conduct the heat inside the main body portion of the multiple electrode assemblies to the outside, so as to help reduce the temperature difference between the inside of the combined structure of multiple electrode assemblies and the shell, and improve the use performance and service life of the battery cell.

[0016] In some embodiments, the heat conducting member comprises:

[0017] A first heat conducting portion, which surrounds the outer periphery of the main body portion of the multiple electrode assemblies;

[0018] A second heat conducting portion, which is arranged between the main body portions of two adjacent electrode assemblies and is connected to the first heat conducting portion.

[0019] In this way, the heat conducting efficiency of the heat conducting member for the combined structure of multiple electrode assemblies can be improved, so that the temperature difference between the inside of the combined structure of multiple electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery cell can be improved.

[0020] In some embodiments, at least one end of the main body portion along the first direction is provided with a tab, and at least part of the heat conducting member surrounds the outer periphery of the main body portion relative to the first direction.

[0021] The size of the orthographic projection of the heat conduction member on the main body in the first direction is a first size, the size of the main body in the first direction is a second size, and the first size is greater than or equal to 0.3 times the second size.

[0022] By adopting the above technical solution, the part of the heat conduction member opposite to the main body has a large size in the first direction, so that the heat conduction member and the main body have a large relative area, which facilitates the efficiency of the heat conduction member in conducting the heat inside the main body out, so that the heat conduction member can effectively conduct the heat of the main body out. And, the part of the heat conduction member opposite to the shell has a large size in the first direction, so that the heat conduction member and the shell have a large relative area, which facilitates the efficiency of the heat conduction member in conducting the heat to the shell. In this way, the efficiency of the heat conduction member in conducting the heat inside the combined structure of the plurality of electrode assemblies out can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery monomer can be improved.

[0023] In some embodiments, the first size is greater than or equal to 0.8 times the second size.

[0024] In this way, the heat conduction member and the main body, and the heat conduction member and the shell have a large relative area. In this way, the efficiency of the heat conduction member in conducting the heat inside the combined structure of the plurality of electrode assemblies out can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery monomer can be improved.

[0025] In some embodiments, in the first direction, the heat conduction member is flush with or exceeds at least one end of the main body.

[0026] By adopting the above technical solution, the heat conduction member and the main body, and the heat conduction member and the shell have a large relative area. In this way, the efficiency of the heat conduction member in conducting the heat inside the combined structure of the plurality of electrode assemblies out can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery monomer can be improved.

[0027] In some embodiments, the battery monomer further comprises a first insulating member, at least a part of the first insulating member is arranged around the outer periphery of the main body, and the thermal conductivity of the heat conduction member is greater than the thermal conductivity of the first insulating member; the first insulating member is arranged between the heat conduction member and the main body, or the heat conduction member is arranged between the main body and the first insulating member.

[0028] By adopting the above technical solution, the positional relationship between the first insulating member and the heat conduction member can be very flexible, so that the heat conduction member can be flexibly arranged to conduct the heat of the main body out. And, the first insulating member can stably realize the insulation effect between the main body and the shell.

[0029] In some embodiments, the number of the electrode assemblies is multiple, and at least part of the first insulating member is arranged around the outer periphery of the main body portion of the multiple electrode assemblies;

[0030] At least part of the heat-conducting member is arranged around the outer periphery of the main body portion of the multiple electrode assemblies, and the first insulating member is arranged between the heat-conducting member and the main body portion; or the heat-conducting member is arranged between the main body portion and the first insulating member.

[0031] By adopting the above technical solutions, when the number of the electrode assemblies is multiple and at least part of the first insulating member is arranged around the outer periphery of the main body portion of the multiple electrode assemblies, the heat-conducting member and the first insulating member can be arranged flexibly, so that the heat-conducting member can effectively conduct the heat of the main body portion out, and the first insulating member can stably achieve the insulation effect between the shell and the main body portion.

[0032] In some embodiments, at least one end of the main body portion along the first direction is provided with a tab, and at least part of the heat-conducting member is arranged around the outer periphery of the main body portion relative to the first direction;

[0033] The battery monomer further comprises a second insulating member, and in the first direction, the second insulating member is arranged at the end of the main body portion with the tab;

[0034] Part of the heat-conducting member is arranged between the outer periphery of the second insulating member relative to the first direction and the shell; or in the first direction, part of the heat-conducting member is arranged between the second insulating member and the main body portion.

[0035] By adopting the above technical solutions, on the one hand, the efficiency of the heat-conducting member in conducting the heat inside the electrode assemblies out can be improved, so that the temperature difference between the inside of the electrode assemblies and the shell can be effectively reduced, and the use performance and service life of the battery monomer can be improved. On the other hand, when the size of the heat-conducting member along the first direction is large, the heat-conducting member can be arranged beyond the end of the main body portion close to the second insulating member along the first direction, and the part of the heat-conducting member arranged beyond the main body portion can be arranged reasonably, which facilitates the arrangement of the heat-conducting member in the shell.

[0036] In some embodiments, the battery monomer further comprises a first insulating member, at least part of the first insulating member is arranged around the outer periphery of the main body portion relative to the first direction, and the thermal conductivity of the heat-conducting member is greater than the thermal conductivity of the first insulating member;

[0037] The first insulating member is arranged between the heat-conducting member and the main body portion, and part of the heat-conducting member is arranged between the outer periphery of the second insulating member relative to the first direction and the shell; or the heat-conducting member is arranged between the main body portion and the first insulating member, and in the first direction, part of the heat-conducting member is arranged between the second insulating member and the main body portion.

[0038] By adopting the technical scheme, when the heat conduction member has a large size along the first direction, part of the heat conduction member can be arranged outside the main body portion along the first direction towards the second insulation member, so as to facilitate the arrangement of the heat conduction member in the shell.

[0039] In some embodiments, the tab is arranged at one end of the main body portion along the first direction, part of the heat conduction member is arranged around the outer periphery of the main body portion relative to the first direction, and part of the heat conduction member is arranged between the end of the main body portion away from the tab along the first direction and the shell.

[0040] By adopting the technical scheme, the heat conduction member and the main body portion have a large relative area, and the heat conduction member and the shell also have a large relative area, so as to improve the efficiency of the heat conduction member in conducting heat inside the main body portion to the shell. In this way, the efficiency of the heat conduction member in conducting heat inside the electrode assembly can be improved, so as to effectively reduce the temperature difference between the inside of the electrode assembly and the shell, and improve the use performance and service life of the battery monomer.

[0041] In some embodiments, the battery monomer further comprises a third insulation member arranged between the end of the main body portion away from the tab along the first direction and the shell.

[0042] In the first direction, the third insulation member is arranged between the main body portion and the heat conduction member, or in the first direction, at least part of the heat conduction member is arranged between the third insulation member and the main body portion.

[0043] By adopting the technical scheme, the heat conduction member and the third insulation member can be arranged flexibly.

[0044] In some embodiments, the battery monomer further comprises a first insulation member, at least part of the first insulation member is arranged around the outer periphery of the main body portion relative to the first direction, and the thermal conductivity of the heat conduction member is greater than that of the first insulation member.

[0045] The first insulation member is arranged between the heat conduction member and the main body portion, and in the first direction, the third insulation member is arranged between the main body portion and the heat conduction member, or the heat conduction member is arranged between the main body portion and the first insulation member, and in the first direction, at least part of the heat conduction member is arranged between the main body portion and the third insulation member.

[0046] By adopting the technical scheme, the arrangement of the third insulation member and the heat conduction member can be reasonably adjusted according to the arrangement of the heat conduction member and the first insulation member, so that the first insulation member and the third insulation member can be stably connected on the basis that the heat conduction member can effectively conduct heat of the main body portion, so that the first insulation member and the third insulation member can stably realize the insulation effect between the main body portion and the shell.

[0047] In some embodiments, the heat-conducting member comprises at least one of a graphene film, a copper foil, an aluminum foil, a graphite heat-dissipation patch, a nano-carbon copper foil, and a nano-carbon aluminum foil.

[0048] By adopting the above technical solution, the heat-conducting member has better heat-conducting performance, can effectively conduct the heat inside the main body to the shell, thereby effectively reducing the temperature difference between the inside of the electrode assembly and the shell, and improving the use performance and service life of the battery monomer.

[0049] In some embodiments, at least part of the heat-conducting member is an insulating structure to realize insulation between the main body and the shell.

[0050] In this way, the heat-conducting member not only can conduct the heat of the main body to the shell to reduce the temperature difference between the inside of the electrode assembly and the shell and improve the use performance and service life of the battery monomer, but also can realize the insulation effect between the shell and the main body to insulate and protect the main body.

[0051] In some embodiments, at least one of the side of the heat-conducting member close to the main body and the side of the heat-conducting member close to the shell is an insulating structure, and the heat-conducting member contacts the main body and the shell.

[0052] In this way, the heat-conducting member can realize the insulation effect between the main body and the shell to insulate and protect the main body. In this way, the first insulating member can be omitted, that is, the heat-conducting member is used to replace the first insulating member to conduct the heat of the main body and to insulate and protect the main body. In this way, the setting of the parts of the battery monomer can be saved.

[0053] In some embodiments, the heat-conducting member is an integral connection structure.

[0054] By making the heat-conducting member an integral connection structure, the heat inside the main body can be conducted out through each position of the heat-conducting member and conducted to the shell through the corresponding position of the heat-conducting member, thereby effectively reducing the temperature difference between the inside of the electrode assembly and the shell and improving the use performance and service life of the battery monomer.

[0055] In some embodiments, the heat-conducting member comprises a protective layer, a heat-conducting layer, and an adhesive layer, and the heat-conducting layer is arranged between the protective layer and the adhesive layer.

[0056] By adopting the above technical solution, the heat-conducting member can be fixed in the shell through the adhesive layer, so that the heat-conducting member can stably realize the heat-conducting effect, thereby effectively reducing the temperature difference between the inside of the electrode assembly and the shell and improving the use performance and service life of the battery monomer.

[0057] In some embodiments, the adhesive layer is arranged on the side of the heat-conducting layer close to the main body and adheres to the main body.

[0058] By adopting the technical solutions, on one hand, the heat conduction member can be fixedly connected to the shell, so that the heat conduction member can stably realize the heat conduction effect. On the other hand, the heat conduction member can be very close to or even contact the main body, so that the heat conduction effect on the main body can be effectively realized. In this way, the temperature difference between the inside of the electrode assembly and the shell can be effectively reduced, and the use performance and service life of the battery monomer can be improved.

[0059] In a second aspect, the embodiments of the present application provide a battery device, including a battery monomer.

[0060] The battery device provided by the embodiments of the present application can improve the heat dissipation performance of the battery monomer, help to improve the use performance and service life of the battery monomer, and improve the use performance and service life of the battery device.

[0061] In some embodiments, at least one end of the main body along the first direction is provided with a tab, and at least part of the heat conduction member is arranged around the outer periphery of the main body relative to the first direction. The battery device further includes a first heat management component, which is located outside the shell, and the distribution direction of the first heat management component intersects the first direction.

[0062] By arranging at least part of the heat conduction member around the outer periphery of the main body relative to the first direction, and arranging the first heat management component to intersect the first direction, the first heat management component can efficiently perform heat management on the heat conduction member, so as to improve the efficiency of the heat conduction member in discharging heat from the inside of the main body, effectively reduce the temperature difference between the inside of the main body and the shell, improve the heat dissipation performance of the battery monomer, help to improve the use performance and service life of the battery monomer, and improve the use performance and service life of the battery device.

[0063] In some embodiments, the tab is arranged at one end of the main body along the first direction, and part of the heat conduction member is arranged at the end of the main body away from the tab along the first direction. The battery device further includes a second heat management component, which is arranged at the end of the main body away from the tab along the first direction and outside the shell.

[0064] By arranging part of the heat conduction member at the end of the main body away from the tab along the first direction, and arranging the second heat management component at the end of the main body away from the tab along the first direction, the second heat management component can efficiently perform heat management on the heat conduction member, so as to improve the efficiency of the heat conduction member in discharging heat from the inside of the main body, effectively reduce the temperature difference between the inside of the main body and the shell, improve the heat dissipation performance of the battery monomer, help to improve the use performance and service life of the battery monomer, and improve the use performance and service life of the battery device.

[0065] In a third aspect, the embodiments of the present application provide an energy storage device, including a battery monomer or a battery device.

[0066] The energy storage device provided by the embodiments of the present application helps to improve the use performance and service life of the energy storage device by using the battery monomer or the battery device involved in the above embodiments.

[0067] In a fourth aspect, the embodiments of the present application provide an energy storage system, comprising a power conversion device and an energy storage device, the power conversion device being configured to electrically connect the power generation device and the energy storage device.

[0068] The energy storage system provided by the embodiments of the present application helps to improve the use performance and service life of the energy storage system by using the energy storage device involved in the above embodiments.

[0069] In a fifth aspect, the embodiments of the present application provide an electric device, comprising a battery monomer or a battery device or an energy storage device or an energy storage system.

[0070] The electric device provided by the embodiments of the present application helps to improve the use performance and service life of the electric device by using the battery monomer, the battery device, the energy storage device or the energy storage system involved in the above embodiments.

[0071] In a sixth aspect, the embodiments of the present application provide a charging network, comprising a charging pile and an energy storage device or an energy storage system, the energy storage device being configured to provide electric energy for the charging pile.

[0072] The charging network provided by the embodiments of the present application helps to improve the use performance and service life of the charging network by using the energy storage device or the energy storage system involved in the above embodiments.

[0073] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0074] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0075] Figure 1 The schematic diagram of the energy storage system provided by some embodiments of the present application is shown in the figure;

[0076] Figure 2 The schematic diagram of the charging network provided by some embodiments of the present application is shown in the figure;

[0077] Figure 3 Schematic view of a vehicle provided for some embodiments of the present application;

[0078] Figure 4 Exploded view of a battery device provided for some embodiments of the present application;

[0079] Figure 5 Perspective view of a battery cell provided for some embodiments of the present application;

[0080] Figure 6 Exploded view of a battery cell provided for some embodiments of the present application; Figure 5

[0081] Figure 7 Figure 5 Cross-sectional view along A-A provided for some embodiments of the present application;

[0082] Figure 8 Figure 7

[0083] Figure 9 Exploded view of a battery cell provided for some embodiments of the present application;

[0084] Figure 10 Figure 9

[0085] Figure 11 Figure 10

[0086] Figure 12 Figure 10 Schematic view under some other embodiments of the present application;

[0087] Figure 13 Figure 12

[0088] Figure 14 Exploded view of a battery cell provided for some embodiments of the present application;

[0089] Figure 15 Figure 14

[0090] Figure 16 Figure 15

[0091] Figure 17 Figure 5

[0092] Figure 18 Figure 17 Schematic view under some other embodiments of the present application;

[0093] ​​​​​​​​​​​​​​​​​​Figure 19 Fig. 1 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 18 Fig. 2 is a schematic diagram of a battery device according to some embodiments of the present application.

[0094] Figure 20 Fig. 3 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 17 Fig. 4 is a schematic diagram of a battery device according to some embodiments of the present application.

[0095] Figure 21 Fig. 5 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 20 Fig. 6 is a schematic diagram of a battery device according to some embodiments of the present application.

[0096] Figure 22 Fig. 7 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 17 Fig. 8 is a schematic diagram of a battery device according to some embodiments of the present application.

[0097] Figure 23 Fig. 9 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 17 Fig. 10 is a schematic diagram of a battery device according to some embodiments of the present application. Fig. 11 is a schematic diagram of a battery device according to some embodiments of the present application.

[0098] Fig. 12 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 24 Fig. 13 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 17 Fig. 14 is a schematic diagram of a battery device according to some embodiments of the present application. Fig. 15 is a schematic diagram of a battery device according to some embodiments of the present application.

[0099] Fig. 16 is a schematic diagram of a battery device according to some embodiments of the present application. Figure 25 Fig. 17 is a schematic diagram of a battery device according to some embodiments of the present application. Fig. 18 is a schematic diagram of a battery device according to some embodiments of the present application.

[0100] In the drawings:

[0101] 1000 - energy storage system; 1100 - power conversion device; 1200 - power generation device; 2000 - charging network; 2100 - charging post; 2200 - connector; 3000 - vehicle; 3100 - controller; 3200 - motor; 100 - energy storage device; 10 - battery device; 1 - battery cell; 2 - box body; 21 - first part; 22 - second part; 3 - first thermal management component; 4 - second thermal management component; 11 - electrode assembly; 111 - main body; 112 - tab; 12 - shell; 121 - shell body; 122 - end cover; 13 - thermal conductive member; 13a - first thermal conductive member; 13b - second thermal conductive member; 131 - first thermal conductive part; 132 - second thermal conductive part; 133 - third thermal conductive part; 134 - fourth thermal conductive part; 135 - fifth thermal conductive part; 136 - protective layer; 137 - thermal conductive layer; 138 - adhesive layer; 14 - first insulating member; 15 - second insulating member; 16 - third insulating member; H1 - first dimension; H2 - second dimension; L - central axis; Z - first direction; Z1 - winding axial direction; Y - second direction; X - third direction. DETAILED DESCRIPTION

[0102] Embodiments of the present application are described below in detail with reference to examples shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not understood as limiting the present application.

[0103] If there is no special description, all the embodiments and optional embodiments of the embodiments of the present application can be combined to form new technical solutions.

[0104] If there is no special description, all the technical features and optional technical features of the embodiments of the present application can be combined to form new technical solutions.

[0105] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0106] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0107] In the description of the embodiments of the present application, the meaning of "multiple" is more than two, and "more than two" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "multiple groups" is more than two groups, including two groups.

[0108] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0109] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0110] In the related art, a battery cell can include a case and an electrode assembly disposed in the case. The electrode assembly includes a body portion and a tab connected to the body portion.

[0111] In some cases, a battery cell generates a large amount of heat during operation, causing the body portion of the electrode assembly to have a large amount of heat accumulated inside. This can cause a large temperature difference between the inside of the body portion and the case, which can affect the performance and lifespan of the battery cell.

[0112] Based on the above considerations, the embodiments of the present application provide a battery cell, a related device, an energy storage system, and a charging network. A heat-conducting member is disposed in the case of the battery cell. The heat-conducting member has a higher thermal conductivity than the case, and at least a portion of the heat-conducting member surrounds the outer periphery of the body portion of the electrode assembly. This allows the heat on the body portion to be efficiently conducted to the heat-conducting member and then to the case. This can accelerate the rate at which the heat inside the body portion is diffused to the case and then released, thereby effectively reducing the temperature difference between the inside of the body portion and the case, improving the heat dissipation performance of the battery cell, and helping to improve the performance and lifespan of the battery cell.

[0113] It should be noted that the related device can include a battery device, a power consumption device, and an energy storage device.

[0114] The battery cell referred to in the embodiments of the present application refers to the smallest unit for storing and outputting electrical energy. The battery cell can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be activated by charging after discharging.

[0115] The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes. The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0116] The battery device according to the embodiments of the present application can be a single physical module including one or more battery cells for providing voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, connected in parallel, or connected in a mixed manner through a busbar. The mixed connection means that the multiple battery cells are connected in series and in parallel.

[0117] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form the battery module. As an example, the multiple battery cells can be fixed to form the battery module by a cable tie or the like. As an example, the multiple battery cells can also be fixed to form the battery module by an end plate, a side plate, or the like.

[0118] In some embodiments, the battery device can be a battery pack, which can include a cabinet and battery cells. As an example, the battery cells can be directly accommodated in the cabinet. As an example, the multiple battery cells can also be first arranged to form one or more battery modules, and then accommodated in the cabinet.

[0119] The battery cells and the battery device according to the embodiments of the present application can be used in an energy storage device using the battery cells or the battery device as an energy storage element.

[0120] The energy storage device according to the embodiments of the present application can be an energy storage container or an energy storage cabinet.

[0121] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output the electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during a low electricity consumption period, and provide electrical energy for related users or electrical devices during a high electricity consumption period.

[0122] The energy storage device can include one or more battery clusters, and each battery cluster includes multiple battery devices.

[0123] In some embodiments, the multiple battery devices in the battery cluster can be connected in series through a busbar to increase the voltage of the energy storage device.

[0124] In some embodiments, when the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in parallel to increase the capacity of the energy storage device.

[0125] In some embodiments, the energy storage device can further include a cabinet body, and the battery clusters are accommodated in the cabinet body.

[0126] In some embodiments, the energy storage device can further include a thermal management module, a master control module, a general control module, a power distribution module, a fire control module, and the like.

[0127] In some embodiments, the thermal management module can include a liquid cooling unit that provides cooling liquid to each battery device through a pipeline for adjusting the temperature of the battery cells.

[0128] In some embodiments, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the master control module can control the charging and discharging current, voltage, etc. of the battery cluster. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0129] In some embodiments, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the master control module can control the charging and discharging current, voltage, etc. of the battery cluster. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0130] In some embodiments, the fire control module can include a control panel, a detector, an alarm device, etc. for detecting, alarming, or extinguishing the energy storage device.

[0131] In some embodiments, the power distribution module can be used to distribute power to modules that need power in the energy storage device.

[0132] The energy storage system according to embodiments of the present application can be any power system that needs to use an energy storage device.

[0133] In some embodiments, please refer to Figure 1 , Figure 1 A schematic diagram of an energy storage system 1000 according to some embodiments of the present application is provided. The energy storage system 1000 according to embodiments of the present application can include an energy storage device 100 and a power conversion device 1100 (PCS) connected between a power generation device 1200 and the energy storage device 100. The power generation device 1200 is used to generate electric energy, and the electric energy generated by the power generation device 1200 can be stored in the energy storage device 100 through the power conversion device 1100. The number of energy storage devices 100 can be one or more.

[0134] As an example, the power generation device 1200 can be a solar panel, a hydroelectric power generation device, a fire power generation device, a wind power generation device, etc.

[0135] In some embodiments, referring to Figure 2 , Figure 2 A schematic diagram of a charging network 2000 is provided for some embodiments of the present application. The charging network 2000 involved in the embodiments of the present application can include a charging pile 2100 and an energy storage device 100, the charging pile 2100 is electrically connected with the energy storage device 100, and the energy storage device 100 is used to provide electric energy for the charging pile 2100.

[0136] Among them, the charging pile 2100 and the battery device in the energy storage device 100 can be electrically connected through a cable, and the battery device can provide the electric energy stored by itself to the charging pile 2100.

[0137] Among them, the charging pile 2100 can have one or more connectors 2200, which are used to connect with the electric device (such as a vehicle), so as to charge the electric device.

[0138] Among them, the energy storage device 100 can be located inside the charging pile 2100 (such as a charging and storage integrated machine), or can be located outside the charging pile 2100.

[0139] The battery monomer and the battery device provided by the embodiments of the present application can also be used in the electric device using the battery monomer or the battery device as a power source.

[0140] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, a vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc. According to the power source, the vehicle can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended range car, etc. According to the driving mode, the vehicle can be a front-drive car, a rear-drive car, or a four-wheel drive car.

[0141] For the convenience of description, the embodiments of the present application take the electric device as a vehicle for example.

[0142] In some embodiments, referring to Figure 3 , Figure 3A schematic diagram of a vehicle 3000 is provided for some embodiments of the present application. The vehicle 3000 is internally provided with a battery device 10, which can be arranged at the bottom or the head or the tail of the vehicle 3000. The battery device 10 can be used for power supply of the vehicle 3000, for example, the battery device 10 can be used as the operating power source of the vehicle 3000. The vehicle 3000 can further include a controller 3100 and a motor 3200, the controller 3100 is used to control the battery device 10 to supply power to the motor 3200, for example, to meet the power demand of the vehicle 3000 during starting, navigation and driving.

[0143] In some embodiments, the battery device 10 can not only be used as the operating power source of the vehicle 3000, but also be used as the driving power source of the vehicle 3000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 3000.

[0144] In some embodiments, please refer to Figure 4 , Figure 4 A disassembled view of the battery device 10 is provided for some embodiments of the present application. The battery device 10 can include a box 2 and a battery cell 1. The box 2 is a structure with an internal space, and the internal space of the box 2 is used to accommodate the battery cell 1.

[0145] The box 2 can adopt various structures. In some embodiments, the box 2 can include a first part 21 and a second part 22, the first part 21 and the second part 22 are covered with each other and jointly define the internal space of the box 2, and the internal space of the box 2 is a closed space. Here, closed means covered or closed, which can be sealed or unsealed. That is, the box 2 can be a sealed structure or an unsealed structure.

[0146] Among them, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 is a plate-shaped structure, the second part 22 is covered on the opening side of the first part 21, so that the first part 21 and the second part 22 jointly define the internal space of the box 2. Alternatively, please refer to Figure 4 , the first part 21 and the second part 22 can both be a hollow structure with an opening at one end, and the opening side of the first part 21 is covered on the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the internal space of the box 2. Among them, the box 2 composed of the first part 21 and the second part 22 can be various shapes, such as cylinder, cuboid, etc.

[0147] In some embodiments, please refer to Figure 4Multiple battery cells 1 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 1 is directly housed in the internal space of the housing 2. In other embodiments, multiple battery cells 1 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 2. In still other embodiments, multiple battery cells 1 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 2.

[0148] In some embodiments, please combine Figure 3 and Figure 4 The housing 2 of the battery unit 10 can be part of the chassis structure of the vehicle 3000. For example, a portion of the housing 2 can be at least a part of the floor of the vehicle 3000, or a portion of the housing 2 can be at least a part of the crossbeams and longitudinal beams of the vehicle 3000.

[0149] In some embodiments, please refer to the following: Figure 5 and Figure 6 , Figure 5 This is a three-dimensional structural diagram of a battery cell 1 provided in some embodiments of this application. Figure 6 for Figure 5 An exploded view of the provided battery cell 1. The battery cell 1 provided in this embodiment may include an electrode assembly 11 and a housing 12.

[0150] Electrode assembly 11 is the component in the battery cell 1 where the electrochemical reaction occurs. Electrode assembly 11 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body 111 of electrode assembly 11, while the portions of the positive and negative electrode sheets without active material each constitute a tab 112. The tab 112 of the positive electrode sheet is the positive tab, and the tab 112 of the negative electrode sheet is the negative tab. The positive and negative tabs can be located together at one end of the main body 111, such as... Figure 6 As shown; or, the positive electrode tab and the negative electrode tab may be located at opposite ends of the main body 111.

[0151] In a single battery cell 1, the number of electrode components 11 can be one or more.

[0152] In some contexts, electrode assembly 11 may also be referred to as bare cell, wound body, laminate, etc.

[0153] In some embodiments, the battery cell 1 can further include an electrolyte, which functions to conduct ions between the positive electrode tab and the negative electrode tab. In some embodiments, the electrolyte can be in a liquid state, a gel state, or a solid state.

[0154] The housing 12 is configured to define an internal environment of the battery cell 1, and the housing 12 is configured to accommodate the electrode assembly 11 and the electrolyte.

[0155] In some embodiments, as shown in Figure 6 , the housing 12 can include a housing body 121 and an end cap 122, and the housing body 121 and the end cap 122 are configured to jointly define an internal environment of the battery cell 1, and the internal environment of the battery cell 1 is configured to accommodate the electrode assembly 11 and the electrolyte. In some embodiments, the housing body 121 and the end cap 122 can be separate components. In some embodiments, the housing body 121 has an opening, and the end cap 122 is configured to cover the opening of the housing body 121 to jointly define the internal environment of the battery cell 1 with the housing body 121, and to isolate the internal environment of the battery cell 1 from an external environment. In some embodiments, the housing body 121 and the end cap 122 can be integrated. In some embodiments, the end cap 122 and the housing body 121 can form a joint surface before the electrode assembly 11 is accommodated in the housing body 121. In some embodiments, the end cap 122 is configured to cover the housing body 121 after the electrode assembly 11 is accommodated in the housing body 121.

[0156] In some embodiments, the housing 12 can be a sealed structure, or can be a non-sealed structure. In some embodiments, when the housing 12 is a sealed structure, the housing 12 is configured to protect the electrode assembly 11, and to prevent electrolyte leakage to some extent. In some embodiments, when the housing 12 is a non-sealed structure, the housing 12 is configured to protect the electrode assembly 11, and a sealing bag can be further included between the housing 12 and the electrode assembly 11, and the sealing bag is configured to accommodate the electrode assembly 11 and the electrolyte. In some embodiments, the sealing bag can be a bag-shaped insulating structure, an aluminum plastic film, or the like.

[0157] In some embodiments, the number of the end cap 122 can be one, as shown in Figure 6 . In some embodiments, the number of the end cap 122 can be two, and the two end caps 122 are respectively arranged at opposite ends of the housing body 121.

[0158] In some embodiments, the housing body 121 can be in a cylindrical shape, a square shape, or the like, and the shape of the housing body 121 can be determined according to the shape and size of the electrode assembly 11. In some embodiments, the material of the housing body 121 and the end cap 122 can be copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0159] In some embodiments, as shown in Figure 5 to Figure 8 , Figure 7 , the battery cell 1 can further include a positive electrode tab 111 and a negative electrode tab 112, and the positive electrode tab 111 and the negative electrode tab 112 are configured to be respectively connected to the positive electrode 110 and the negative electrode 120. Figure 5 In some embodiments, as shown in Figure 8 , the battery cell 1 can further include a positive electrode tab 111 and a negative electrode tab 112, and the positive electrode tab 111 and the negative electrode tab 112 are configured to be respectively connected to the positive electrode 110 and the negative electrode 120.For Figure 7 An enlarged view of the middle B. The battery cell 1 provided by the embodiments of the present application comprises an electrode assembly 11, a shell 12 and a heat-conducting member 13. The electrode assembly 11 comprises a main body part 111 and a tab 112 connected to the main body part 111, and both the main body part 111 and the tab 112 are arranged in the shell 12. The heat-conducting member 13 is arranged in the shell 12 and at least partially surrounds the outer periphery of the main body part 111, and the heat-conductivity of the heat-conducting member 13 is greater than that of the shell 12.

[0160] The heat-conducting member 13 refers to a component having heat-conducting performance, and can be specifically used for conducting heat to the main body part 111. The heat-conducting member 13 can be a film structure arranged independently relative to the shell 12 and the main body part 111, or can be a coating arranged between the shell 12 and the main body part 111.

[0161] The heat-conducting member 13 is arranged in the shell 12 and at least partially surrounds the outer periphery of the main body part 111, which means that the heat-conducting member 13 is arranged between the shell 12 and the main body part 111, and at least part of the heat-conducting member 13 surrounds the outer periphery of the main body part 111.

[0162] At least part of the heat-conducting member 13 surrounds the outer periphery of the main body part 111, which means that at least part of the heat-conducting member 13 surrounds at least part of the outer periphery of the main body part 111. It can be understood that the two ends of the heat-conducting member 13 can be connected or overlapped with other parts of the heat-conducting member 13. In other words, in the cross section of the battery cell 1 parallel to the surrounding direction of the heat-conducting member 13, along the surrounding direction of the heat-conducting member 13, the length of the heat-conducting member 13 can be greater than or equal to the circumference of the main body part 111 surrounded by the heat-conducting member 13, so that the heat-conducting member 13 is substantially annular and at least surrounds one turn. The two ends of the heat-conducting member 13 can also be arranged without overlapping with other parts of the heat-conducting member 13. In other words, in the cross section of the battery cell 1 parallel to the surrounding direction of the heat-conducting member 13, along the surrounding direction of the heat-conducting member 13, the length of the heat-conducting member 13 can also be less than the circumference of the main body part 111 surrounded by the heat-conducting member 13, so that the heat-conducting member 13 is substantially "C" shaped and at least part of the heat-conducting member 13 surrounds the outer periphery of the main body part 111. The two ends of the heat-conducting member 13 are opposite ends of the heat-conducting member 13 in the surrounding direction, and the surrounding direction of the heat-conducting member 13 can be substantially the circumferential direction of the heat-conducting member 13. The cross section of the battery cell 1 parallel to the surrounding direction of the heat-conducting member 13 is substantially similar to the cross section view of Figure 7 and Figure 8 , and can be specifically referred to each other.

[0163] At least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111, which means that at least part of the heat conducting member 13 is arranged around the outer periphery of at least one main body part 111. It can be understood that when the number of electrode assemblies 11 is one, at least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111 of the electrode assembly 11. When the number of electrode assemblies 11 is more than one, at least part of the heat conducting member 13 can be arranged around the outer periphery of the main body part 111 of one electrode assembly 11, or can be arranged around the outer periphery of a plurality of main body parts 111.

[0164] The heat conductivity of the heat conducting member 13 is greater than that of the shell 12, which means that the heat conducting performance of the heat conducting member 13 is better than that of the shell 12. Therefore, compared with the shell 12, the heat conducting member 13 can more quickly conduct the heat inside the main body part 111 away, so that the heat of the main body part 111 can be more quickly spread.

[0165] The battery monomer 1 provided by the embodiment of the present application can efficiently conduct the heat on the main body part 111 to the heat conducting member 13 and then to the shell 12 by arranging the heat conducting member 13 in the shell 12 of the battery monomer 1, the heat conductivity of the heat conducting member 13 being greater than that of the shell 12, and at least part of the heat conducting member 13 being arranged around the outer periphery of the main body part 111 of the electrode assembly 11. In this way, the rate of spreading the heat inside the main body part 111 to the shell 12 for release can be accelerated, so that the temperature difference between the inside of the main body part 111 and the shell 12 can be effectively reduced, the heat dissipation performance of the battery monomer 1 is improved, and the use performance and service life of the battery monomer 1 are improved.

[0166] In some embodiments, please refer to Figure 5 to Figure 8 , and combine with other drawings. The main body part 111 is provided with the above-mentioned tab 112 at at least one end along the first direction Z, and at least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111 relative to the first direction Z.

[0167] It can be understood that, as Figure 6 shown, the positive electrode tab 112 and the negative electrode tab 112 of the electrode assembly 11 are arranged at one end of the main body part 111 along the first direction Z; or the positive electrode tab 112 and the negative electrode tab 112 of the electrode assembly 11 are arranged at opposite ends of the main body part 111 along the first direction Z. At least part of the tab 112 extends out of the main body part 111 along the first direction Z.

[0168] The outer periphery of the main body part 111 relative to the first direction Z refers to the outer periphery of the main body part 111 around the center axis L parallel to the first direction Z. The plane formed by the circumferential direction of the outer periphery of the main body part 111 is substantially perpendicular to the first direction Z.

[0169] The central axis L is parallel to the first direction Z and passes through the main body 111 along the first direction Z.

[0170] According to the above technical solution, the heat-conducting member 13 is arranged at least partially around the outer periphery of the main body 111 relative to the first direction Z, so that the heat-conducting member 13 has a relatively large area relative to the main body 111, thereby facilitating the heat-conducting member 13 to efficiently conduct heat from the inside of the main body 111. In addition, the heat-conducting member 13 also has a relatively large area relative to the shell 12, thereby facilitating the heat-conducting member 13 to efficiently conduct heat to the shell 12. In this way, the temperature difference between the inside of the main body 111 and the shell 12 can be effectively reduced, and the use performance and service life of the battery cell 1 can be improved.

[0171] According to the above technical solution, the heat-conducting member 13 is arranged at least partially around the outer periphery of the main body 111 relative to the first direction Z, so that the heat-conducting member 13 has a relatively large area relative to the main body 111, thereby facilitating the heat-conducting member 13 to efficiently conduct heat from the inside of the main body 111. In addition, the heat-conducting member 13 also has a relatively large area relative to the shell 12, thereby facilitating the heat-conducting member 13 to efficiently conduct heat to the shell 12. In this way, the temperature difference between the inside of the main body 111 and the shell 12 can be effectively reduced, and the use performance and service life of the battery cell 1 can be improved.

[0172] In other embodiments, the main body 111 is provided with the above-mentioned tab 112 at at least one end along the first direction Z, and at least part of the heat-conducting member 13 can also be arranged around the outer periphery of the main body 111 relative to another direction intersecting the first direction Z.

[0173] In some embodiments, please refer to Figure 5 to Figure 8 , and in combination with other drawings. The electrode assembly 11 is a wound structure having a winding axis Z1, the main body 111 is provided with a tab 112 at at least one end along the winding axis Z1, and at least part of the heat-conducting member 13 is arranged around the outer periphery of the main body 111 relative to the winding axis Z1.

[0174] It can be understood that the positive electrode tab, the negative electrode tab, and the separator of the electrode assembly 11 are wound around the central axis L and arranged to form the electrode assembly 11, so that the electrode assembly 11 is a wound structure. The plane in which the winding direction of the positive electrode tab, the negative electrode tab, and the separator is located is substantially perpendicular to the winding axis Z1. The winding axis Z1 is parallel to the central axis L.

[0175] It can be understood that when the electrode assembly 11 is a wound structure, the above-mentioned first direction Z is the winding axis Z1.

[0176] The positive electrode tab 112 and the negative electrode tab 112 can be arranged at one end of the main body 111 along the winding axis Z1, such as Figure 6Alternatively, the positive electrode tab 112 and the negative electrode tab 112 are respectively arranged at opposite ends of the main body portion 111 along the winding axis direction Z1.

[0177] The outer periphery of the main body portion 111 relative to the winding axis direction Z1 refers to the outer periphery of the main body portion 111 around the central axis L. The plane formed by the circumferential direction of the main body portion 111 is substantially perpendicular to the winding axis direction Z1.

[0178] The at least partial circumferential arrangement of the heat conduction member 13 around the outer periphery of the main body portion 111 relative to the winding axis direction Z1 is such that the plane in which the circumferential direction of the heat conduction member 13 lies is substantially perpendicular to the winding axis direction Z1.

[0179] The cross section of the main body portion 111 perpendicular to the winding axis direction Z1 can be substantially square and a combined shape of two semicircles at opposite ends, as shown in Figure 7 The cross section of the main body portion 111 perpendicular to the winding axis direction Z1 can also be substantially circular.

[0180] It should be noted that the arrangement of the electrode assembly 11 in a wound structure makes it very difficult for heat inside the electrode assembly 11 to be conducted out. The battery monomer 1 provided in the embodiments of the present application has the at least partial circumferential arrangement of the heat conduction member 13 around the outer periphery of the main body portion 111 relative to the winding axis direction Z1, so that the heat conduction member 13 and the main body portion 111 have a relatively large relative area, and the heat conduction member 13 can better conduct the heat inside the main body portion 111 out. Furthermore, the heat conduction member 13 and the outer shell 12 also have a relatively large relative area, so that the heat conduction member 13 can better conduct heat to the outer shell 12. Such an arrangement can effectively reduce the temperature difference between the inside of the main body portion 111 and the outer shell 12, and improve the use performance and service life of the battery monomer 1.

[0181] In other embodiments, the positive electrode tab and the negative electrode tab can be arranged in a stacked manner, so that the electrode assembly 11 is substantially in a stacked structure. The separator can be arranged in a wound manner or in a stacked manner.

[0182] In some embodiments, please refer to Figure 6 to Figure 8 , and in combination with other drawings. The number of heat conduction members 13 and the number of electrode assemblies 11 are both multiple, and the at least partial circumferential arrangement of each heat conduction member 13 around the outer periphery of the main body portion 111 of each electrode assembly 11 is provided.

[0183] As can be understood, as shown in Figure 6 to Figure 8 , the number of heat conduction members 13 and the number of electrode assemblies 11 are the same, the heat conduction member 13 and the electrode assembly 11 correspond one by one, and the at least partial circumferential arrangement of each heat conduction member 13 around the outer periphery of the main body portion 111 of each electrode assembly 11 is provided.

[0184] For the convenience of description, the heat conduction member 13 is defined as a first heat conduction member 13a, the number of the first heat conduction member 13a is multiple, the first heat conduction member 13a comprises a third heat conduction part 133, and the third heat conduction part 133 of each first heat conduction member 13a is arranged around the outer periphery of the main body part 111 of each electrode assembly 11. Among them, the third heat conduction part 133 is at least part of the first heat conduction member 13a, has heat conduction performance, and the thermal conductivity of the third heat conduction part 133 is greater than that of the shell 12.

[0185] As an example, as shown in Figure 6 to Figure 8 , at least part of each heat conduction member 13 is arranged around the outer periphery of the main body part 111 of each electrode assembly 11 relative to the first direction Z.

[0186] As an example, as shown in Figure 6 to Figure 8 , the plurality of electrode assemblies 11 are distributed along the second direction Y.

[0187] By arranging at least part of each heat conduction member 13 around the outer periphery of the main body part 111 of each electrode assembly 11, each heat conduction member 13 can be targeted to conduct heat inside the main body part 111 of each electrode assembly 11. And, in this way, two layers of heat conduction members 13 are provided between the main body parts 111 of the two adjacent electrode assemblies 11, which facilitates the heat conduction between the main body parts 111 of the two adjacent electrode assemblies 11. By arranging in this way, the heat conduction efficiency of the heat conduction member 13 for the heat inside the combined structure of the plurality of electrode assemblies 11 can be improved, thereby effectively reducing the temperature difference between the inside of the combined structure of the plurality of electrode assemblies 11 and the shell 12, and improving the use performance and life of the battery monomer 1.

[0188] In some embodiments, please refer to Figure 9 to Figure 16 , and in combination with other drawings. Figure 9 The exploded view of the battery monomer 1 provided for another embodiment of the present application, Figure 10 is Figure 9 the cross-sectional view of the assembled battery monomer 1 along C-C, Figure 11 is Figure 10 the enlarged view at D in Figure 12 is Figure 10 the schematic view under another embodiment, Figure 13 is Figure 12 the enlarged view at E in Figure 14 The exploded view of the battery monomer 1 provided for another embodiment of the present application, Figure 15 is Figure 14 the cross-sectional view of the assembled battery monomer 1 along F-F, Figure 16 is Figure 15 the enlarged view at G in The number of electrode assemblies 11 is multiple, and at least part of the heat conduction member 13 is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11.

[0189] For the convenience of description, the heat conducting member 13 is defined as a second heat conducting member 13b, at least part of which is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11.

[0190] As an example, as shown in Figure 9 to Figure 16 , the plurality of electrode assemblies 11 are distributed along a second direction Y, and at least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11 relative to a first direction Z.

[0191] In this way, the heat conducting member 13 can conduct the heat inside the main body part 111 of the plurality of electrode assemblies 11 outwards, thereby helping to reduce the temperature difference between the combined structure formed by the plurality of electrode assemblies 11 and the shell 12, so as to improve the use performance and service life of the battery monomer 1.

[0192] It should be noted here that the first direction Z and the second direction Y are substantially perpendicular, allowing for some error. The electrode assembly 11 can further include a third direction X. The third direction X is substantially perpendicular to the first direction Z, allowing for some error. The third direction X and the second direction Y are substantially perpendicular, allowing for some error.

[0193] In some cases, the first direction Z can be the height direction of the electrode assembly 11, the second direction Y can be the thickness direction of the electrode assembly 11, and the third direction X can be the width direction of the electrode assembly 11. The thickness of the electrode assembly 11 is less than the width of the electrode assembly 11.

[0194] In some embodiments, please refer to Figure 12 and Figure 13 , and in combination with other drawings. The heat conducting member 13 includes a first heat conducting part 131 and a second heat conducting part 132. The first heat conducting part 131 is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11. The second heat conducting part 132 is arranged between the main body parts 111 of two adjacent electrode assemblies 11 and connected to the first heat conducting part 131.

[0195] It can be understood that the above-mentioned second heat conducting member 13b includes the above-mentioned first heat conducting part 131 and the second heat conducting part 132. The first heat conducting part 131 and the second heat conducting part 132 are two parts of the second heat conducting member 13b, both of which have heat conducting performance. Moreover, the heat conductivity of the first heat conducting part 131 and the heat conductivity of the second heat conducting part 132 are both greater than the heat conductivity of the shell 12.

[0196] The first heat conducting part 131 and the second heat conducting part 132 can be integrally formed or connected in separate parts.

[0197] The first heat conducting part 131 is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11, so that the first heat conducting part 131 can conduct the heat inside the main body part 111 to the shell 12. The second heat conducting part 132 is arranged between the main body parts 111 of two adjacent electrode assemblies 11, and is connected to the first heat conducting part 131, so that the heat between the main body parts 111 of the two adjacent electrode assemblies 11 can be conducted out through the second heat conducting part 132 and the first heat conducting part 131 to the shell 12. In other words, the second heat conducting part 132 and the first heat conducting part 131 can cooperate to conduct the heat inside the combined structure of the plurality of electrode assemblies 11 to the shell 12. In this way, the heat conducting efficiency of the heat conducting member 13 for the heat inside the combined structure of the plurality of electrode assemblies 11 can be improved, so that the temperature difference between the combined structure of the plurality of electrode assemblies 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0198] In some embodiments, please refer to Figure 6 and Figure 17 , and in combination with other drawings. Among them, Figure 17 is Figure 5 a sectional view along H-H. The main body part 111 is provided with a tab 112 at least one end along the first direction Z, and at least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111 relative to the first direction Z.

[0199] The size of the orthographic projection of the heat conducting member 13 on the main body part 111 on the first direction Z is a first size H1, and the size of the main body part 111 on the first direction Z is a second size H2, and the first size H1≥0.3*the second size H2.

[0200] Specifically, the first size H1 can be 0.3*the second size H2, 0.35*the second size H2, 0.4*the second size H2, 0.45*the second size H2, 0.5*the second size H2, 0.55*the second size H2, 0.6*the second size H2, 0.65*the second size H2, 0.7*the second size H2, 0.75*the second size H2, 0.8*the second size H2, 0.85*the second size H2, 0.9*the second size H2, 0.95*the second size H2, the second size H2, and the first size H1 can also be greater than the second size H2.

[0201] By adopting the above technical solutions, the part of the heat conduction member 13 opposite to the main body part 111 has a large size in the first direction Z, so that the heat conduction member 13 and the main body part 111 have a large relative area, which facilitates to improve the efficiency of the heat conduction member 13 in conducting the heat inside the main body part 111 out, so that the heat conduction member 13 can effectively conduct the heat of the main body part 111 out. Moreover, the part of the heat conduction member 13 opposite to the shell 12 has a large size in the first direction Z, so that the heat conduction member 13 and the shell 12 have a large relative area, which facilitates to improve the efficiency of the heat conduction member 13 in conducting the heat to the shell 12. In this way, the efficiency of the heat conduction member 13 in conducting the heat inside the combined structure of the plurality of electrode assemblies 11 out can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0202] In some embodiments, please refer to Figure 17 , and in combination with other drawings. The first size H1 is greater than or equal to 0.8 times the second size H2.

[0203] Specifically, the first size H1 can be 0.8 times the second size H2, 0.85 times the second size H2, 0.9 times the second size H2, 0.95 times the second size H2, the second size H2, etc., and the first size H1 can also be greater than the second size H2.

[0204] In this way, the heat conduction member 13 and the main body part 111, and the heat conduction member 13 and the shell 12 have a large relative area. In this way, the efficiency of the heat conduction member 13 in conducting the heat inside the combined structure of the plurality of electrode assemblies 11 out can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0205] In some embodiments, please refer to Figure 17 and Figure 18 , and in combination with other drawings. Wherein, Figure 18 is Figure 17 a schematic diagram under another embodiment. In the first direction Z, the heat conduction member 13 is flush with or exceeds at least one end of the main body part 111.

[0206] As can be understood, Figure 17 , in the first direction Z, one end of the heat conduction member 13 can be flush with one end of the main body part 111. Or, as shown in Figure 18 , in the first direction Z, one end of the heat conduction member 13 can also exceed one end of the main body part 111.

[0207] As Figure 17 and Figure 18As shown, in the first direction Z, the other end of the heat conduction member 13 can protrude beyond the other end of the main body portion 111. Alternatively, in the first direction Z, the other end of the heat conduction member 13 can be flush with the other end of the main body portion 111.

[0208] By adopting the above technical solution, the relative area between the heat conduction member 13 and the main body portion 111 and between the heat conduction member 13 and the shell 12 is large. In this way, the heat dissipation efficiency of the heat conduction member 13 for the heat inside the combined structure of the plurality of electrode assemblies 11 can be improved, so that the temperature difference between the inside of the combined structure of the plurality of electrode assemblies 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0209] In some embodiments, please refer to Figure 6 to Figure 16 , and in combination with other drawings. The battery monomer 1 further comprises a first insulation member 14, at least part of the first insulation member 14 is arranged around the outer periphery of the main body portion 111, and the thermal conductivity of the heat conduction member 13 is greater than the thermal conductivity of the first insulation member 14.

[0210] The first insulation member 14 refers to an insulation structure for protecting the main body portion 111 and achieving the insulation protection effect between the shell 12 and the main body portion 111.

[0211] At least part of the first insulation member 14 arranged around the outer periphery of the main body portion 111 means that at least part of the first insulation member 14 is arranged around the outer periphery of the main body portion 111 of at least one electrode assembly 11. That is, at least part of one first insulation member 14 can be arranged around the outer periphery of the main body portion 111 of one electrode assembly 11, and at least part of one first insulation member 14 can also be arranged around the outer periphery of the main body portion 111 of a plurality of electrode assemblies 11.

[0212] As an example, as Figure 6 to Figure 16 shown, at least part of the first insulation member 14 is arranged around the outer periphery of the main body portion 111 relative to the first direction Z.

[0213] The thermal conductivity of the heat conduction member 13 is greater than the thermal conductivity of the first insulation member 14, so that the heat conduction performance of the heat conduction member 13 is better than the insulation performance of the first insulation member 14. It can be understood that when the heat conduction member 13 is the first heat conduction member 13a, the thermal conductivity of the first heat conduction member 13a is greater than the thermal conductivity of the first insulation member 14, specifically, the thermal conductivity of the third heat conduction portion 133 is greater than the thermal conductivity of the first insulation member 14. When the heat conduction member 13 is the second heat conduction member 13b, the thermal conductivity of the second heat conduction member 13b is greater than the thermal conductivity of the first insulation member 14, specifically, the thermal conductivity of the first heat conduction portion 131 and the thermal conductivity of the second heat conduction portion 132 are both greater than the thermal conductivity of the first insulation member 14.

[0214] In some possible designs, the first insulation member 14 can be, but is not limited to, a Mylar film.

[0215] In some possible design, as shown in Figure 6 to Figure 13 The heat-conducting member 13 is arranged between the main body part 111 and the first insulating member 14.

[0216] By adopting the above technical solution, the heat on the main body part 111 can be conducted to the shell 12 in turn through the heat-conducting member 13 and the first insulating member 14. By arranging the heat-conducting member 13 between the main body part 111 and the first insulating member 14, the heat-conducting member 13 can be close to or even contact the main body part 111, so that the efficiency of heat conduction from the inside of the main body part 111 to the heat-conducting member 13 can be improved, that is, the efficiency of heat conduction from the inside of the main body part 111 to the heat-conducting member 13 can be improved, so that the temperature difference between the inside of the electrode assembly 11 and the shell 12 can be effectively reduced.

[0217] In addition, when the battery monomer 1 is manufactured, the heat-conducting member 13 can be first wound around the outer periphery of the main body part 111, and the heat-conducting member 13 and the main body part 111 are connected, and then the first insulating member 14 is wound around the outer periphery of the main body part 111, and the main body part 111, the heat-conducting member 13 and the first insulating member 14 are assembled in the shell 12. In this way, the assembly of the battery monomer 1 is very simple.

[0218] In some possible design, as shown in Figure 14 to Figure 16 The first insulating member 14 is arranged between the heat-conducting member 13 and the main body part 111.

[0219] By adopting the above technical solution, the position relationship between the first insulating member 14 and the heat-conducting member 13 can be very flexible, so that the heat-conducting member 13 can be arranged flexibly to conduct the heat of the main body part 111. And the first insulating member 14 can stably realize the insulation effect between the main body part 111 and the shell 12.

[0220] In some embodiments, please refer to Figure 6 to Figure 16 , and in combination with other drawings. The number of electrode assemblies 11 is multiple, and at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the multiple electrode assemblies 11.

[0221] As an example, as shown in Figure 6 to Figure 16 At least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the multiple electrode assemblies 11 relative to the first direction Z.

[0222] In some possible design, as shown in Figure 6 to Figure 13 The heat-conducting member 13 is arranged between the main body part 111 and the first insulating member 14.

[0223] The heat-conducting member 13 can be the first heat-conducting member 13a described above, as shown in Figure 6 to Figure 8As shown, the number of the first heat conductive members 13a is multiple, the third heat conductive part 133 of each first heat conductive member 13a surrounds the outer periphery of the main body part 111 of each electrode assembly 11, the first insulating member 14 surrounds the outer periphery of the main body part 111 of the multiple electrode assemblies 11, and surrounds the outer periphery of the multiple first heat conductive members 13a. The heat conductive member 13 can also be the second heat conductive member 13b as described above, as shown in FIG. 2. Figure 9 to Figure 13 As shown, at least part of the second heat conductive member 13b surrounds the outer periphery of the main body part 111 of the multiple electrode assemblies 11, the first insulating member 14 surrounds the outer periphery of the main body part 111 of the multiple electrode assemblies 11, and surrounds the outer periphery of the second heat conductive member 13b.

[0224] In some possible designs, as shown in FIG. 3, Figure 14 to Figure 16 As shown, at least part of the heat conductive member 13 surrounds the outer periphery of the main body part 111 of the multiple electrode assemblies 11, and the first insulating member 14 is arranged between the heat conductive member 13 and the main body part 111.

[0225] In some possible designs, as shown in FIG. 4,

[0226] By adopting the above technical solutions, when the number of the electrode assemblies 11 is multiple, and at least part of the first insulating member 14 surrounds the outer periphery of the main body part 111 of the multiple electrode assemblies 11, the heat conductive member 13 and the first insulating member 14 can be arranged flexibly, so that the heat conductive member 13 can effectively conduct the heat of the main body part 111 out, and the first insulating member 14 can stably achieve the insulation effect between the housing 12 and the main body part 111.

[0227] In some embodiments, when the number of the electrode assemblies 11 is multiple, the number of the first insulating members 14 can also be multiple, and each first insulating member 14 surrounds the outer periphery of the main body part 111 of each electrode assembly 11.

[0228] Based on this, in some possible designs, the heat conductive member 13 can be arranged between the main body part 111 and the first insulating member 14.

[0229] In some possible designs, as shown in FIG. 4,

[0230] In some possible designs, the first insulating member 14 can be arranged between the main body part 111 and the heat conductive member 13.

[0231] In some embodiments, the heat conducting member 13 can be a first heat conducting member 13a. The first heat conducting member 13a can be provided around at least a portion of the outer periphery of the main body portion 111 of each of the electrode assemblies 11. The first insulating member 14 can be provided between the main body portion 111 of each of the electrode assemblies 11 and the first heat conducting member 13a. In other words, the first heat conducting member 13a can be provided around the outer periphery of the main body portion 111 of each of the electrode assemblies 11 and around the outer periphery of the first insulating member 14.

[0232] In some embodiments, the heat conducting member 13 can be a second heat conducting member 13b. The second heat conducting member 13b can be provided around at least a portion of the outer periphery of the main body portion 111 of each of the electrode assemblies 11 and around at least a portion of the outer periphery of the first insulating member 14. As an example, the second heat conducting member 13b can include a first heat conducting portion 131 and a second heat conducting portion 132. The first heat conducting portion 131 can be provided around at least a portion of the outer periphery of the main body portion 111 of each of the electrode assemblies 11 and around at least a portion of the outer periphery of the first insulating member 14. The second heat conducting portion 132 can be provided between the main body portion 111 of two adjacent electrode assemblies 11 and between the first insulating member 14 of two adjacent electrode assemblies 11.

[0233] In some embodiments, please refer to Figure 6 、 Figure 18 to Figure 21 , and in combination with other drawings. In some embodiments, Figure 19 is an enlarged view of I in Figure 18 , Figure 20 is a schematic view of yet some other embodiments, Figure 17 is an enlarged view of J in Figure 21 . The main body portion 111 can be provided with the tab 112 at at least one end thereof in the first direction Z. The heat conducting member 13 can be provided around at least a portion of the outer periphery of the main body portion 111 in the first direction Z. Figure 20 The battery cell 1 can further include a second insulating member 15. In the first direction Z, the second insulating member 15 can be provided between the main body portion 111 and the housing 12.

[0234] The second insulating member 15 can be a member having insulating properties and can be used to achieve an insulating effect between the electrode assembly 11 and the housing 12.

[0235] It can be understood that, in the first direction Z, the second insulating member 15 can be provided between the main body portion 111 and the housing 12.

[0236] In some possible designs, the second insulating member 15 can be, but is not limited to, a plastic.

[0237] In some embodiments, the second insulating member 15 can be provided around at least a portion of the outer periphery of the main body portion 111 of each of the electrode assemblies 11 and around at least a portion of the outer periphery of the first insulating member 14.

[0238] Figure 6 ​As shown, the positive electrode tab 112 and the negative electrode tab 112 are disposed at one end of the main body portion 111 along the first direction Z. The second insulating member 15 is disposed at the end of the main body portion 111 with the positive electrode tab 112 and the negative electrode tab 112, and is disposed between the main body portion 111 and the outer shell 12 along the first direction Z. Alternatively, the positive electrode tab 112 and the negative electrode tab 112 can be disposed at opposite ends of the main body portion 111 along the first direction Z, and there are two second insulating members 15, which are respectively disposed at opposite ends of the main body portion 111 along the first direction Z.

[0239] It should be noted that the thermal conductivity of the heat-conducting component 13 is greater than that of the second insulating component 15.

[0240] It should be noted that the heat-conducting element 13 may extend beyond the end of the main body 111 near the second insulating element 15 along the first direction Z. For ease of description, the portion of the heat-conducting element 13 extending beyond the end of the main body 111 near the second insulating element 15 along the first direction Z is defined as the fourth heat-conducting portion 134, and the heat-conducting element 13 includes the fourth heat-conducting portion 134. The fourth heat-conducting portion 134 is a part of the heat-conducting element 13 and also has thermal conductivity. The thermal conductivity of the fourth heat-conducting portion 134 is greater than that of the outer shell 12, greater than that of the first insulating element 14, and also greater than that of the second insulating element 15.

[0241] When the heat-conducting element 13 is the first heat-conducting element 13a, the fourth heat-conducting part 134 and the third heat-conducting part 133 are distributed along the first direction Z and are connected. When the heat-conducting element 13 is the second heat-conducting element 13b, the fourth heat-conducting part 134 and the first heat-conducting part 131 are distributed along the first direction Z and are connected.

[0242] In some possible designs, such as Figure 18 and Figure 19 As shown, in the first direction Z, a portion of the heat-conducting element 13 is disposed between the second insulating element 15 and the main body 111.

[0243] Understandably, the fourth heat-conducting part 134 of the heat-conducting member 13 is provided at one end of the main body 111 close to the second insulating member 15 along the first direction Z, and is provided between the main body 111 and the second insulating member 15 along the first direction Z.

[0244] In this way, the heat-conducting member 13 can conduct heat of the main body portion 111 to the outside in the first direction Z to improve the heat-conducting efficiency of the main body portion 111. In addition, when the heat-conducting member 13 has a large size in the first direction Z, the heat-conducting member 13 can be arranged outside the end of the main body portion 111 close to the second insulating member 15 in the first direction Z, and the portion of the heat-conducting member 13 outside the end of the main body portion 111 in the first direction Z can be bent to form the fourth heat-conducting portion 134, and the fourth heat-conducting portion 134 of the heat-conducting member 13 can be arranged between the main body portion 111 and the second insulating member 15 in the first direction Z, which facilitates the arrangement of the heat-conducting member 13 in the shell 12.

[0245] In some possible designs, as shown in Figure 20 to Figure 21 The portion of the heat-conducting member 13 is arranged between the outer periphery of the second insulating member 15 relative to the first direction Z and the shell 12.

[0246] It can be understood that at least a portion of the fourth heat-conducting portion 134 surrounds the outer periphery of the second insulating member 15 relative to the first direction Z and is arranged between the second insulating member 15 and the shell 12.

[0247] In this way, the size of the heat-conducting member 13 in the first direction Z can be increased, and thus the relative area between the heat-conducting member 13 and the shell 12 can be increased, which facilitates the heat-conducting efficiency of the heat-conducting member 13 to the shell 12, and improves the heat-conducting efficiency of the heat-conducting member 13 to the heat inside the electrode assembly 11. In addition, when the heat-conducting member 13 has a large size in the first direction Z, the heat-conducting member 13 can be arranged outside the end of the main body portion 111 close to the second insulating member 15 in the first direction Z, and at least a portion of the portion of the heat-conducting member 13 outside the end of the main body portion 111 in the first direction Z can be extended to between the outer periphery of the second insulating member 15 relative to the first direction Z and the shell 12, which facilitates the arrangement of the heat-conducting member 13.

[0248] By using the above technical solutions, on the one hand, the heat-conducting efficiency of the heat-conducting member 13 to the heat inside the electrode assembly 11 can be improved, so that the temperature difference between the electrode assembly 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved. On the other hand, when the heat-conducting member 13 has a large size in the first direction Z, the heat-conducting member 13 can be arranged outside the end of the main body portion 111 close to the second insulating member 15 in the first direction Z, and the portion of the heat-conducting member 13 outside the end of the main body portion 111 in the first direction Z can be arranged reasonably, which facilitates the arrangement of the heat-conducting member 13 in the shell 12.

[0249] In some embodiments, please refer to Figure 18 to Figure 21, and in combination with other drawings. The battery cell 1 further comprises a first insulating member 14, at least a portion of the first insulating member 14 is arranged around the outer periphery of the main body portion 111 relative to the first direction Z, and the thermal conductivity of the thermal conductive member 13 is greater than the thermal conductivity of the first insulating member 14. Wherein, the first insulating member 14 involved in the embodiments of the present application is the same as the first insulating member 14 in the above-mentioned embodiments, which will not be repeated here.

[0250] In some possible designs, as shown in Figure 18 and Figure 19 , the thermal conductive member 13 is arranged between the main body portion 111 and the first insulating member 14, and in the first direction Z, a portion of the thermal conductive member 13 is arranged between the second insulating member 15 and the main body portion 111.

[0251] It can be understood that the fourth thermal conductive portion 134 is arranged between the main body portion 111 and the second insulating member 15 along the first direction Z.

[0252] In some cases, the first insulating member 14 extends beyond the main body portion 111 along the first direction Z near the end of the second insulating member 15, and the portion of the first insulating member 14 extending beyond the main body portion 111 along the first direction Z is bent relative to the main body portion 111 and fixed to the side of the second insulating member 15 along the first direction Z near the main body portion 111 by melting or the like. Based on this, the fourth thermal conductive portion 134 can be arranged between the main body portion 111 and the first insulating member 14 along the first direction Z.

[0253] In this way, when the thermal conductive member 13 is arranged between the main body portion 111 and the first insulating member 14, when the size of the thermal conductive member 13 in the first direction Z is large, the portion of the thermal conductive member 13 extending beyond the main body portion 111 along the first direction Z towards the second insulating member 15 can be bent to form the fourth thermal conductive portion 134, and the fourth thermal conductive portion 134 of the thermal conductive member 13 is arranged between the main body portion 111 and the first insulating member 14 along the first direction Z, so as to facilitate the arrangement of the thermal conductive member 13 in the shell 12.

[0254] In some possible designs, as shown in Figure 20 and Figure 21 , the first insulating member 14 is arranged between the thermal conductive member 13 and the main body portion 111, and a portion of the thermal conductive member 13 is arranged between the outer periphery of the second insulating member 15 relative to the first direction Z and the shell 12.

[0255] In this way, when the first insulating member 14 is arranged between the thermal conductive member 13 and the main body portion 111, when the size of the thermal conductive member 13 in the first direction Z is large, at least a portion of the portion of the thermal conductive member 13 extending beyond the main body portion 111 along the first direction Z towards the second insulating member 15 can be extended to between the outer periphery of the second insulating member 15 relative to the first direction Z and the shell 12, so as to facilitate the arrangement of the thermal conductive member 13 in the shell 12.

[0256] By adopting the above technical solution, when the size of the heat-conducting component 13 along the first direction Z is large, a portion of the heat-conducting component 13 can extend beyond the main body 111 along the first direction Z toward the second insulating component 15 and be reasonably arranged, thereby facilitating the arrangement of the heat-conducting component 13 within the outer casing 12.

[0257] In some embodiments, such as Figure 17 and Figure 22 As shown, and in conjunction with other accompanying figures. Among them, Figure 22 for Figure 17 The schematic diagram is shown in some other embodiments. When the heat-conducting element 13 is disposed between the first insulating element 14 and the main body 111, the heat-conducting element 13 can extend along the first direction Z toward the second insulating element 15 without exceeding the outer side of the main body 111, such as... Figure 17 As shown, the fourth heat-conducting part 134 is not formed. When the first insulating member 14 is provided between the main body 111 and the heat-conducting member 13, the heat-conducting member 13 can extend beyond the main body 111 along the first direction Z toward the second insulating member 15 without extending beyond the main body 111, that is, the fourth heat-conducting part 134 is not formed.

[0258] In some embodiments, please refer to the following: Figure 6 , Figure 17 to Figure 23 And in conjunction with other accompanying figures. Figure 23 for Figure 17 Schematic diagrams in some other embodiments. A tab 112 is disposed at one end of the main body 111 along the first direction Z, and a portion of the heat-conducting element 13 is disposed around the outer periphery of the main body 111 relative to the first direction Z. A portion of the heat-conducting element 13 is disposed between the end of the main body 111 away from the tab 112 along the first direction Z and the outer casing 12.

[0259] Understandably, the heat-conducting element 13 extends beyond the end of the main body 111 away from the tab 112 along the first direction Z. For ease of description, the portion of the heat-conducting element 13 extending beyond the end of the main body 111 away from the tab 112 along the first direction Z is defined as the fifth heat-conducting portion 135, and the heat-conducting element 13 includes the fifth heat-conducting portion 135. The fifth heat-conducting portion 135 is a part of the heat-conducting element 13 and also has thermal conductivity. The thermal conductivity of the fifth heat-conducting portion 135 is greater than that of the outer shell 12, greater than that of the first insulating element 14, and greater than that of the second insulating element 15.

[0260] When the heat-conducting element 13 is the first heat-conducting element 13a, the fifth heat-conducting part 135 and the third heat-conducting part 133 are distributed along the first direction Z and are connected. Furthermore, the fourth heat-conducting part 134 and the fifth heat-conducting part 135 are respectively connected to the opposite ends of the third heat-conducting part 133 along the first direction Z.

[0261] When the heat conducting member 13 is the second heat conducting member 13b, the fifth heat conducting part 135 and the first heat conducting part 131 are distributed and connected along the first direction Z, specifically, the fifth heat conducting part 135 and the fourth heat conducting part 134 are connected to opposite ends of the first heat conducting part 131 along the first direction Z, respectively. Alternatively, the fifth heat conducting part 135 and the second heat conducting part 132 are distributed and connected along the first direction Z, specifically, the fifth heat conducting part 135 and the fourth heat conducting part 134 are connected to opposite ends of the second heat conducting part 132 along the first direction Z, respectively. Alternatively, the fifth heat conducting part 135 and the first heat conducting part 131 are distributed and connected along the first direction Z, the fifth heat conducting part 135 and the second heat conducting part 132 are distributed and connected along the first direction Z, specifically, the fifth heat conducting part 135 and the fourth heat conducting part 134 are connected to opposite ends of the first heat conducting part 131 along the first direction Z, respectively, and the fifth heat conducting part 135 and the fourth heat conducting part 134 are connected to opposite ends of the second heat conducting part 132 along the first direction Z, respectively.

[0262] As shown in Figure 17 to Figure 23 , and in conjunction with other drawings. The fifth heat conducting part 135 is arranged between the one end of the main body part 111 away from the tab 112 along the first direction Z and the shell 12.

[0263] By adopting the above technical solution, the heat conducting member 13 and the main body part 111 have a relatively large area, and the heat conducting member 13 and the shell 12 also have a relatively large area, which can improve the efficiency of the heat conducting member 13 conducting heat inside the main body part 111 to the shell 12. In this way, the efficiency of the heat conducting member 13 conducting heat inside the electrode assembly 11 can be improved, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the performance and life of the battery monomer 1.

[0264] In some embodiments, please refer to Figure 17 to Figure 23 , and in conjunction with other drawings. The battery monomer 1 further comprises a third insulating member 16, which is arranged between the one end of the main body part 111 away from the tab 112 along the first direction Z and the shell 12.

[0265] The third insulating member 16 refers to a part with insulating properties, mainly used to achieve insulation between the main body part 111 and the shell 12. In addition, the third insulating member 16 can also be used to raise the main body part 111 to facilitate the electrolyte to infiltrate the main body part 111.

[0266] In some possible designs, the third insulating member 16 can be but is not limited to a bottom support plate, and can be but is not limited to a plastic member.

[0267] It is to be noted that the thermal conductivity of the thermal conductive member 13 is greater than the thermal conductivity of the third insulating member 16. Specifically, when the thermal conductive member 13 is the first thermal conductive member 13a, the thermal conductivity of the third thermal conductive portion 133, the thermal conductivity of the fourth thermal conductive portion 134, and the thermal conductivity of the fifth thermal conductive portion 135 can all be greater than the thermal conductivity of the third insulating member 16. When the thermal conductive member 13 is the second thermal conductive member 13b, the thermal conductivity of the first thermal conductive portion 131, the thermal conductivity of the second thermal conductive portion 132, the thermal conductivity of the fourth thermal conductive portion 134, and the thermal conductivity of the fifth thermal conductive portion 135 can all be greater than the thermal conductivity of the third insulating member 16.

[0268] In some possible designs, as shown in Figure 17 to Figure 19 Fig. 1, and in combination with other figures. In the first direction Z, at least part of the thermal conductive member 13 is disposed between the third insulating member 16 and the main body portion 111.

[0269] It can be understood that the fifth thermal conductive portion 135 is disposed between the third insulating member 16 and the main body portion 111 in the first direction Z, such that the third insulating member 16 is disposed between the fifth thermal conductive portion 135 and the shell 12 in the first direction Z.

[0270] In some possible designs, as shown in Figure 20 to Figure 23 Fig. 1, and in combination with other figures. In the first direction Z, the third insulating member 16 is disposed between the main body portion 111 and the thermal conductive member 13.

[0271] It can be understood that the third insulating member 16 is disposed between the main body portion 111 and the fifth thermal conductive portion 135 in the first direction Z, such that the fifth thermal conductive portion 135 is disposed between the third insulating member 16 and the shell 12 in the first direction Z.

[0272] By adopting the above technical solutions, the thermal conductive member 13 and the third insulating member 16 can be flexibly arranged.

[0273] In some embodiments, please refer to Fig. 1, and in combination with other figures. The battery monomer 1 further comprises a first insulating member 14, at least part of the first insulating member 14 is disposed around the outer periphery of the main body portion 111 relative to the first direction Z, and the thermal conductivity of the thermal conductive member 13 is greater than the thermal conductivity of the first insulating member 14.

[0274] In some possible designs, as shown in Figure 17 to Figure 19 Fig. 1, and in combination with other figures. The thermal conductive member 13 is disposed between the main body portion 111 and the first insulating member 14, and in the first direction Z, at least part of the thermal conductive member 13 is disposed between the main body portion 111 and the third insulating member 16.

[0275] It can be understood that the fifth heat conduction part 135 of the heat conduction member 13 is arranged between the main body part 111 and the third insulating member 16 along the first direction Z. In this way, the arrangement of the fifth heat conduction part 135 does not interfere with the connection between the first insulating member 14 and the third insulating member 16, facilitating the arrangement of the heat conduction member 13, the first insulating member 14, and the third insulating member 16 in the shell 12.

[0276] In some possible designs, as shown in Figure 6 , Figure 17 to Figure 19 The part of the first insulating member 14 can be arranged between the end of the main body part 111 away from the tab 112 along the first direction Z and the shell 12. Based on this, in the first direction Z, the part of the first insulating member 14 can be arranged between the fifth heat conduction part 135 and the third insulating member 16.

[0277] In some possible designs, as shown in Figure 20 to Figure 23 , Figure 6 The first insulating member 14 is arranged between the heat conduction member 13 and the main body part 111, and in the first direction Z, the third insulating member 16 is arranged between the main body part 111 and the heat conduction member 13.

[0278] It can be understood that the fifth heat conduction part 135 is arranged between the side of the third insulating member 16 away from the tab 112 along the first direction Z and the shell 12. In this way, the fifth heat conduction part 135 can be very close to or even contact the shell 12, which can improve the efficiency of the heat conduction member 13 in conducting heat to the shell 12, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12 and improving the use performance and service life of the battery monomer 1. Moreover, the arrangement of the fifth heat conduction part 135 does not interfere with the connection between the first insulating member 14 and the third insulating member 16, facilitating the arrangement of the heat conduction member 13, the first insulating member 14, and the third insulating member 16 in the shell 12.

[0279] By adopting the above technical solutions, the arrangement of the third insulating member 16 and the heat conduction member 13 can be reasonably adjusted according to the arrangement of the heat conduction member 13 and the first insulating member 14, so that the first insulating member 14 and the third insulating member 16 can be stably connected on the basis that the heat conduction member 13 can effectively conduct heat away from the main body part 111, thereby enabling the first insulating member 14 and the third insulating member 16 to stably achieve the insulation effect between the main body part 111 and the shell 12.

[0280] In some embodiments, the heat conduction member 13 includes at least one of a graphene film, a copper foil, an aluminum foil, a graphite heat dissipation patch, a nano-carbon copper foil, and a nano-carbon aluminum foil.

[0281] It can be understood that the material of the heat conduction member 13 can include at least one of graphene, copper, aluminum, nano-carbon copper, nano-carbon aluminum, and the like.

[0282] By adopting the above technical solution, the heat conduction member 13 has better heat conduction performance, can effectively conduct the heat inside the main body part 111 to the shell 12, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the use performance and service life of the battery monomer 1.

[0283] In some embodiments, at least part of the heat conduction member 13 is an insulating structure to achieve insulation between the main body part 111 and the shell 12.

[0284] It can be understood that at least part of the heat conduction member 13 has insulation performance. For example, the heat conduction member 13 includes at least one of a graphene film and a graphite heat dissipation pad, so that the heat conduction member 13 not only has good heat conduction performance, but also has good insulation performance.

[0285] In this way, the heat conduction member 13 can not only conduct the heat of the main body part 111 to the shell 12 to reduce the temperature difference between the inside of the electrode assembly 11 and the shell 12 and improve the use performance and service life of the battery monomer 1, but also can achieve the insulation effect between the shell 12 and the main body part 111 to insulate and protect the main body part 111.

[0286] In some embodiments, please refer to Figure 23 , and in combination with other drawings. At least one of the side of the heat conduction member 13 close to the main body part 111 and the side of the heat conduction member 13 close to the shell 12 is an insulating structure, and the heat conduction member 13 contacts the main body part 111 and the shell 12.

[0287] In this way, the heat conduction member 13 can achieve the insulation effect between the main body part 111 and the shell 12 to insulate and protect the main body part 111. In this way, the first insulating member 14 can be omitted, that is, the first insulating member 14 is replaced by the heat conduction member 13 to conduct the heat of the main body part 111 and to insulate and protect the main body part 111. In this way, the setting of the parts of the battery monomer 1 can be saved.

[0288] For example, the heat conduction member 13 can include at least one of a graphene film and a graphite heat dissipation pad, so that the heat conduction member 13 has insulation performance, thereby the heat conduction member 13 can replace the first insulating member 14.

[0289] In some embodiments, the heat conduction member 13 is an integral connection structure.

[0290] It can be understood that when the heat conduction member 13 is the first heat conduction member 13a, the third heat conduction part 133, the fourth heat conduction part 134 and the fifth heat conduction part 135 of the first heat conduction member 13a can be integrally formed to make the first heat conduction member 13a an integral connection structure.

[0291] When the heat conduction piece 13 is the second heat conduction piece 13b, the first heat conduction part 131, the second heat conduction part 132, the fourth heat conduction part 134 and the fifth heat conduction part 135 of the second heat conduction piece 13b can be integrally formed to form an integral connection structure.

[0292] By making the heat conduction piece 13 an integral connection structure, the heat conduction piece 13 can conduct the heat inside the main body part 111 to the shell 12 through the corresponding position of the heat conduction piece 13, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the use performance and service life of the battery monomer 1.

[0293] In some embodiments, the thermal conductivity of the heat conduction piece 13 is ≥100 W / m·K.

[0294] Specifically, the thermal conductivity of the heat conduction piece 13 can be 100 W / m·K, 200 W / m·K, 300 W / m·K, 400 W / m·K, 500 W / m·K, 600 W / m·K, 700 W / m·K, 800 W / m·K, 900 W / m·K, 1000 W / m·K, 1100 W / m·K, 1200 W / m·K, 1300 W / m·K, 1400 W / m·K, 1500 W / m·K, 1600 W / m·K, 1700 W / m·K, 1800 W / m·K, etc.

[0295] In this way, the heat conduction piece 13 has a large thermal conductivity, which facilitates the heat conduction piece 13 to conduct the heat inside the main body part 111 to the shell 12, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the use performance and service life of the battery monomer 1.

[0296] In some embodiments, the thermal conductivity of the heat conduction piece 13 is ≥1000 W / m·K.

[0297] Specifically, the thermal conductivity of the heat conduction piece 13 can be 1000 W / m·K, 1050 W / m·K, 1100 W / m·K, 1150 W / m·K, 1200 W / m·K, 1250 W / m·K, 1300 W / m·K, 1350 W / m·K, 1400 W / m·K, 1450 W / m·K, 1500 W / m·K, 1550 W / m·K, 1600 W / m·K, 1650 W / m·K, 1700 W / m·K, 1750 W / m·K, 1800 W / m·K, etc.

[0298] In this way, the heat conduction piece 13 has a large thermal conductivity, which facilitates the heat conduction piece 13 to conduct the heat inside the main body part 111 to the shell 12, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the use performance and service life of the battery monomer 1.

[0299] In some embodiments, refer to Figure 24 , and in combination with other drawings. Among them, Figure 24 is Figure 17 an enlarged view of K in FIG. 1. The heat conduction piece 13 includes a protective layer 136, a heat conduction layer 137, and an adhesive layer 138, and the heat conduction layer 137 is arranged between the protective layer 136 and the adhesive layer 138.

[0300] The protective layer 136 refers to a structure layer for protecting the heat conduction layer 137, which can be but is not limited to a single-sided adhesive layer. For example, the protective layer 136 is bonded to the heat conduction layer 137.

[0301] The heat conduction layer 137 refers to a structure layer for conducting heat, which can be but is not limited to at least one of graphene film, copper foil, aluminum foil, graphite heat dissipation paste, nano-carbon copper foil, and nano-carbon aluminum foil.

[0302] The adhesive layer 138 refers to a structure layer with adhesive ability, wherein the adhesive layer 138 is arranged on the side of the heat conduction layer 137 away from the protective layer 136. Among them, the side of the adhesive layer 138 away from the heat conduction layer 137 is used for bonding. Wherein the adhesive layer 138 can be but is not limited to double-sided adhesive, and the adhesive layer 138 and the heat conduction layer 137 are bonded.

[0303] By adopting the above technical solution, the heat conduction piece 13 can be fixed in the shell 12 by the adhesive layer 138, so that the heat conduction piece 13 can stably realize the heat conduction function, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12, and improving the use performance and life of the battery monomer 1.

[0304] In some embodiments, refer to Figure 24 , and in combination with other drawings. The adhesive layer 138 is arranged on the side of the heat conduction layer 137 close to the main body part 111.

[0305] When the heat conduction piece 13 is arranged between the first insulating piece 14 and the main body part 111, as shown in Figure 6 to Figure 13 , Figure 17 to Figure 19 , and in combination with other drawings, the adhesive layer 138 of the heat conduction piece 13 can be bonded to the main body part 111.

[0306] When the heat conduction piece 13 is the first heat conduction piece 13a, the third heat conduction part 133 is bonded to the main body part 111 through the adhesive layer 138. When the heat conduction piece 13 is the second heat conduction piece 13b, the first heat conduction part 131 and the second heat conduction part 132 can be bonded to the main body part 111 through the adhesive layer 138.

[0307] When the heat-conducting member 13 includes the fourth heat-conducting part 134, the fourth heat-conducting part 134 can be bonded to the one end of the main body part 111 close to the second insulating member 15 through the bonding layer 138. When the heat-conducting member 13 includes the fifth heat-conducting part 135, the fifth heat-conducting part 135 can be bonded to the one end of the main body part 111 away from the tab 112 through the bonding layer 138.

[0308] When the first insulating member 14 is arranged between the heat-conducting member 13 and the main body part 111, as shown in Figure 14 to Figure 16 、 Figure 20 to Figure 22 and in combination with other drawings, the bonding layer 138 of the heat-conducting member 13 can be bonded to the side of the first insulating member 14 away from the main body part 111.

[0309] When the heat-conducting member 13 is the first heat-conducting member 13a, the third heat-conducting part 133 is bonded to the side of the first insulating member 14 away from the main body part 111 through the bonding layer 138. When the heat-conducting member 13 is the second heat-conducting member 13b, the first heat-conducting part 131 and the second heat-conducting part 132 can be bonded to the side of the first insulating member 14 away from the main body part 111 through the bonding layer 138.

[0310] When the heat-conducting member 13 includes the fourth heat-conducting part 134, the fourth heat-conducting part 134 can be bonded to the outer periphery of the second insulating member 15 through the bonding layer 138. When the heat-conducting member 13 includes the fifth heat-conducting part 135, the fifth heat-conducting part 135 can be bonded to the side of the third insulating member 16 away from the main body part 111 through the bonding layer 138.

[0311] When the heat-conducting member 13 replaces the first insulating member 14, as shown in Figure 23 and in combination with other drawings, the heat-conducting member 13 can be bonded to the main body part 111 through the bonding layer 138.

[0312] By adopting the above technical solutions, on the one hand, the heat-conducting member 13 can be conveniently bonded and fixed in the shell 12, so that the heat-conducting member 13 can stably realize the heat-conducting effect. On the other hand, the heat-conducting member 13 can be very close to or even in contact with the main body part 111, so that the heat-conducting effect on the main body part 111 can be effectively realized. In this way, the temperature difference between the inside of the electrode assembly 11 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0313] In some embodiments, as shown in Figure 6 to Figure 13 、 Figure 17 to Figure 19 and in combination with other drawings, the bonding layer 138 is arranged on the side of the heat-conducting layer 137 close to the main body part 111 and is bonded to the main body part 111.

[0314] In this way, the heat conducting member 13 can be arranged close to or even in contact with the main body 111, so that the heat conducting member 13 can effectively conduct heat to the main body 111. In this way, the temperature difference between the inside of the electrode assembly 11 and the outer shell 12 can be effectively reduced, and the service performance and service life of the battery monomer 1 can be improved.

[0315] In some embodiments, the thickness of the heat conducting layer 137 ranges from 50 μm to 100 μm, and can be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, etc.

[0316] Please refer to Figure 4 and Figure 25 together with other drawings. Among them, Figure 25 is a partial cross-sectional view of a battery device 10 provided by some embodiments of the present application. The battery device 10 provided by the embodiments of the present application includes a battery monomer 1. Among them, the battery monomer 1 in the present embodiment is the same as the battery monomer 1 in the above embodiments, and the specific description is referred to the related description of the battery monomer 1 in the above embodiments, which will not be repeated here.

[0317] The battery device 10 provided by the embodiments of the present application can improve the heat dissipation performance of the battery monomer 1 by using the battery monomer 1 related in the above embodiments, which is helpful to improve the service performance and service life of the battery monomer 1, so as to improve the service performance and service life of the battery device 10.

[0318] In some embodiments, please refer to Figure 4 and Figure 25 together with other drawings. The main body 111 is provided with a tab 112 at least one end along the first direction Z, and at least part of the heat conducting member 13 is arranged around the outer periphery of the main body 111 relative to the first direction Z. The battery device 10 further includes a first heat management component 3, which is located outside the outer shell 12, and the distribution direction of the first heat management component 3 intersects the first direction Z.

[0319] The first heat management component 3 refers to a component for heat management of the battery monomer 1. Specifically, a flow channel can be arranged inside the first heat management component 3, and the flow channel inside the first heat management component 3 can circulate a heat management medium such as cooling liquid, which is used for heat management of the battery monomer 1.

[0320] It can be understood that the distribution direction of the first thermal management component 3 and the shell 12 intersects the first direction Z, that is, an included angle greater than 0° and less than 180° can be formed between the distribution direction of the first thermal management component 3 and the shell 12 and the first direction Z, that is, the distribution direction of the first thermal management component 3 and the shell 12 is not parallel to the first direction Z. The distribution direction of the first thermal management component 3 and the shell 12 can be perpendicular to the first direction Z, or can not be perpendicular. The distribution direction of the first thermal management component 3 and the shell 12 can be coplanar, or can not be coplanar.

[0321] As an example, the first thermal management component 3 and the shell 12 can be distributed along the second direction Y described above, as shown in Figure 25 As an example, the first thermal management component 3 and the shell 12 can also be distributed along the third direction X described above.

[0322] By arranging at least part of the heat conduction member 13 around the outer periphery of the main body part 111 relative to the first direction Z, and intersecting the distribution direction of the first thermal management component 3 and the shell 12 with the first direction Z, the first thermal management component 3 can be efficiently thermally managed with the heat conduction member 13, thereby improving the efficiency of the heat conduction member 13 in conducting heat inside the main body part 111, effectively reducing the temperature difference between the inside of the main body part 111 and the shell 12, and improving the heat dissipation performance of the battery monomer 1, which helps to improve the use performance and service life of the battery monomer 1, thereby improving the use performance and service life of the battery device 10.

[0323] In some embodiments, please refer to Figure 25 , and in combination with other drawings. The tab 112 is arranged at one end of the main body part 111 along the first direction Z, and part of the heat conduction member 13 is arranged at the end of the main body part 111 away from the tab 112 along the first direction Z. The battery device 10 further comprises a second thermal management component 4, which is arranged at the end of the main body part 111 away from the tab 112 along the first direction Z, and outside the shell 12.

[0324] It can be understood that the heat conduction member 13 can surround the outer periphery of the main body part 111, so that part of the heat conduction member 13 is arranged at the end of the main body part 111 away from the tab 112 along the first direction Z. Alternatively, as shown in Figure 25 , and in combination with other drawings, part of the heat conduction member 13 is arranged around the outer periphery of the main body part 111 relative to the first direction Z, and part of the heat conduction member 13 is arranged at the end of the main body part 111 away from the tab 112 along the first direction Z.

[0325] The second thermal management component 4 refers to a component for thermally managing the battery monomer 1. Specifically, a flow channel can be arranged inside the second thermal management component 4, and a cooling liquid or other thermal management medium can circulate in the flow channel inside the second thermal management component 4 to achieve thermal management of the battery monomer 1.

[0326] By means of the part of the heat conduction member 13 being arranged at the end of the main body part 111 away from the tab 112 along the first direction Z, and the second heat management component being arranged at the end of the main body part 111 away from the tab 112 along the first direction Z, the second heat management component 4 can be efficiently heat managed with the heat conduction member 13, so as to improve the efficiency of the heat conduction member 13 in conducting the heat inside the main body part 111 out, effectively reduce the temperature difference between the inside of the main body part 111 and the shell 12, and improve the heat dissipation performance of the battery monomer 1, which helps to improve the use performance and service life of the battery monomer 1, so as to improve the use performance and service life of the battery device 10.

[0327] The energy storage device 100 provided by the embodiment of the present application comprises the battery monomer 1 or the battery device 10. The battery monomer 1 and the battery device 10 in the embodiment are the same as those in the above embodiments, and details are described in the related description of the battery monomer 1 and the battery device 10 in the above embodiments, which will not be repeated here.

[0328] The energy storage device 100 provided by the embodiment of the present application comprises the battery monomer 1 or the battery device 10. The battery monomer 1 and the battery device 10 in the embodiment are the same as those in the above embodiments, and details are described in the related description of the battery monomer 1 and the battery device 10 in the above embodiments, which will not be repeated here.

[0329] Please refer to Figure 1 , and in combination with other drawings. The energy storage system 1000 provided by the embodiment of the present application comprises the power conversion device 1100 and the energy storage device 100, and the power conversion device 1100 is used to electrically connect the power generation device 1200 and the energy storage device 100. The energy storage device 100 in the embodiment is the same as that in the above embodiments, and details are described in the related description of the energy storage device 100 in the above embodiments, which will not be repeated here.

[0330] The energy storage system 1000 provided by the embodiment of the present application comprises the power conversion device 1100 and the energy storage device 100, and the power conversion device 1100 is used to electrically connect the power generation device 1200 and the energy storage device 100. The energy storage device 100 in the embodiment is the same as that in the above embodiments, and details are described in the related description of the energy storage device 100 in the above embodiments, which will not be repeated here.

[0331] Please refer to Figure 3 , and in combination with other drawings. The energy storage system 1000 provided by the embodiment of the present application comprises the power conversion device 1100 and the energy storage device 100, and the power conversion device 1100 is used to electrically connect the power generation device 1200 and the energy storage device 100. The energy storage device 100 in the embodiment is the same as that in the above embodiments, and details are described in the related description of the energy storage device 100 in the above embodiments, which will not be repeated here.

[0332] The power utilization device provided by the embodiments of the present application is helpful to improve the use performance and service life of the power utilization device by adopting the battery monomer 1, the battery device 10, the energy storage device 100 or the energy storage system 1000.

[0333] Please refer to Figure 2 , and in combination with other drawings. The charging network 2000 provided by the embodiments of the present application includes the charging pile 2100, and further includes the energy storage device 100 or the energy storage system 1000, and the energy storage device 100 is used to provide electric energy for the charging pile 2100. The energy storage device 100 and the energy storage system 1000 in the embodiments are the same as the energy storage device 100 and the energy storage system 1000 in the above embodiments, and the specific description is referred to the related description of the energy storage device 100 and the energy storage system 1000 in the above embodiments, which will not be repeated here.

[0334] The charging pile 2100 provided by the embodiments of the present application is helpful to improve the use performance and service life of the charging network 2000 by adopting the energy storage device 100 or the energy storage system 1000.

[0335] As one of the embodiments of the present application, as shown in Figure 5 to Figure 8 , the battery monomer 1 includes the electrode assembly 11, the shell 12, the heat conduction member 13 and the first insulation member 14. The electrode assembly 11 is in a winding structure, and the winding structure includes a winding axial direction Z1. The electrode assembly 11 includes the main body part 111 and the tab 112 connected to at least one end of the main body part 111 along the winding axial direction Z1, and the main body part 111, the tab 112, the heat conduction member 13 and the first insulation member 14 are all arranged in the shell 12. The number of the heat conduction member 13 is multiple, and the number of the electrode assembly 11 is multiple. Each heat conduction member 13 is arranged around the outer periphery of the main body part 111 of each electrode assembly 11 relative to the winding axial direction Z1, and the first insulation member 14 is arranged around the outer periphery of the multiple electrode assemblies 11 and the multiple heat conduction members 13 relative to the winding axial direction Z1. The heat conductivity of the heat conduction member 13 is greater than the heat conductivity of the shell 12, and is greater than the heat conductivity of the first insulation member 14.

[0336] The above is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a shell; a plurality of electrode assemblies, each of which comprises a body portion and a tab connected to the body portion, the body portion and the tab being arranged in the shell; a plurality of heat-conducting members arranged at least partially around the outer periphery of the body portion of each of the electrode assemblies and in the shell, the heat-conducting members having a higher thermal conductivity than the shell.

2. The battery cell of claim 1, wherein, The electrode assembly has a winding axis, and the body portion of the electrode assembly is provided with the tab at at least one end along the winding axis, and the heat-conducting member is arranged at least partially around the outer periphery of the body portion of the electrode assembly relative to the winding axis.

3. The battery cell according to claim 1 or 2, characterized in that, The number of the electrode assemblies is plural, and the heat-conducting member is arranged at least partially around the outer periphery of the body portion of each of the electrode assemblies.

4. The battery cell according to claim 1 or 2, characterized in that, The number of the electrode assemblies is plural, and the heat-conducting member is arranged at least partially around the outer periphery of the body portion of each of the electrode assemblies.

5. The battery cell of claim 4, wherein, The heat-conducting member comprises: a first heat-conducting portion arranged around the outer periphery of the body portion of each of the electrode assemblies; and a second heat-conducting portion arranged between the body portions of two adjacent electrode assemblies and connected to the first heat-conducting portion.

6. The battery cell according to claim 1 or 2, characterized in that, The body portion is provided with the tab at at least one end along a first direction, and the heat-conducting member is arranged at least partially around the outer periphery of the body portion relative to the first direction. The size of the orthographic projection of the heat-conducting member on the body portion in the first direction is a first size, and the size of the body portion in the first direction is a second size, and the first size is greater than or equal to 0.3 times the second size.

7. The battery cell of claim 6, wherein, The first size is greater than or equal to 0.8 times the second size.

8. The battery cell of claim 6, wherein, In the first direction, the heat-conducting member is flush with or protrudes beyond at least one end of the body portion.

9. The battery cell according to claim 1 or 2, characterized in that, The battery cell further comprises a first insulating member arranged at least partially around the outer periphery of the body portion, and the thermal conductivity of the heat-conducting member is greater than that of the first insulating member; the first insulating member is arranged between the heat-conducting member and the body portion, or the heat-conducting member is arranged between the body portion and the first insulating member.

10. The battery cell of claim 9, wherein, The number of the electrode assemblies is plural, and the first insulating member is arranged at least partially around the outer periphery of the body portion of each of the electrode assemblies. The heat-conducting member is arranged at least partially around the outer periphery of the body portion of each of the electrode assemblies, and the first insulating member is arranged between the heat-conducting member and the body portion, or the heat-conducting member is arranged between the body portion and the first insulating member.

11. The battery cell according to claim 1 or 2, characterized in that, The body portion is provided with the tab at at least one end along a first direction, and the heat-conducting member is arranged at least partially around the outer periphery of the body portion relative to the first direction. The battery cell further comprises a second insulating member arranged at one end of the body portion having the tab in the first direction. Part of the heat-conducting member is arranged between the outer periphery of the second insulating member relative to the first direction and the shell, or part of the heat-conducting member is arranged between the second insulating member and the body portion in the first direction.

12. The battery cell of claim 11, wherein, The battery cell further comprises a first insulating member, at least a portion of the first insulating member is arranged around an outer periphery of the main body portion relative to the first direction, and a thermal conductivity of the heat conducting member is greater than a thermal conductivity of the first insulating member; The first insulating member is arranged between the heat conducting member and the main body portion, and a portion of the heat conducting member is arranged between an outer periphery of the second insulating member relative to the first direction and the housing; or the heat conducting member is arranged between the main body portion and the first insulating member, and in the first direction, a portion of the heat conducting member is arranged between the second insulating member and the main body portion.

13. The battery cell of claim 1 or 2, wherein, The tab is arranged at one end of the main body portion along a first direction, a portion of the heat conducting member is arranged around an outer periphery of the main body portion relative to the first direction, and a portion of the heat conducting member is arranged between the one end of the main body portion away from the tab along the first direction and the housing.

14. The battery cell of claim 13, wherein, The battery cell further comprises a third insulating member, the third insulating member is arranged between the one end of the main body portion away from the tab along the first direction and the housing; In the first direction, the third insulating member is arranged between the main body portion and the heat conducting member; or in the first direction, at least a portion of the heat conducting member is arranged between the third insulating member and the main body portion.

15. The battery cell of claim 14, wherein, The battery cell further comprises a first insulating member, at least a portion of the first insulating member is arranged around an outer periphery of the main body portion relative to the first direction, and a thermal conductivity of the heat conducting member is greater than a thermal conductivity of the first insulating member; The first insulating member is arranged between the heat conducting member and the main body portion, and in the first direction, the third insulating member is arranged between the main body portion and the heat conducting member; or the heat conducting member is arranged between the main body portion and the first insulating member, and in the first direction, at least a portion of the heat conducting member is arranged between the main body portion and the third insulating member.

16. The battery cell of claim 1 or 2, wherein, The heat conducting member comprises at least one of a graphene film, a copper foil, an aluminum foil, a graphite heat dissipation patch, a nano-carbon copper foil, and a nano-carbon aluminum foil.

17. The battery cell of claim 1 or 2, wherein, At least a portion of the heat conducting member is an insulating structure to achieve insulation between the main body portion and the housing.

18. The battery cell of claim 1 or 2, wherein, At least one of a side of the heat conducting member close to the main body portion and a side of the heat conducting member close to the housing is an insulating structure, and the heat conducting member contacts the main body portion and the housing.

19. The battery cell of claim 1 or 2, wherein, The heat conducting member is an integrally connected structure.

20. The battery cell of claim 1 or 2, wherein, The heat conducting member comprises a protective layer, a heat conducting layer, and an adhesive layer, the heat conducting layer is arranged between the protective layer and the adhesive layer.

21. The battery cell of claim 20, wherein, The adhesive layer is arranged at a side of the heat conducting layer close to the main body portion and adheres to the main body portion.

22. A battery device, characterized by The battery device comprises the battery cell according to any one of claims 1-21.

23. The battery device of claim 22, wherein, At least one end of the main body portion along a first direction is provided with the tab, at least a portion of the heat conducting member is arranged around an outer periphery of the main body portion relative to the first direction; the battery device further comprises a first thermal management component, the first thermal management component is located outside the housing, and a distribution direction of the first thermal management component intersects the first direction.

24. The battery device of claim 22 or 23, wherein, The tab is arranged at one end of the main body part in a first direction, and a part of the heat conducting member is arranged at an end of the main body part away from the tab in the first direction; the battery device further comprises a second thermal management component, which is arranged at an end of the main body part away from the tab in the first direction and outside the shell.

25. An energy storage device, comprising: A battery device according to any one of claims 22-24.

26. An energy storage system characterized by, A power conversion device for electrically connecting a power generation device and the energy storage device.

27. An electrical device, comprising: A battery device according to any one of claims 22-24 or an energy storage device according to claim 25 or an energy storage system according to claim 26.

28. A charging network characterized by, A charging pile and an energy storage device according to claim 25 or an energy storage system according to claim 26, wherein the energy storage device is used to provide electric energy for the charging pile.

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