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

Abstract

The present application is applicable to the technical field of batteries. Provided are a battery cell (1), related apparatuses, an energy storage system (1000), and a charging network (2000). The related apparatuses comprise a battery apparatus (10), an energy storage apparatus (100), and an electrical apparatus. The battery cell (1) comprises a casing (12), an electrode assembly (11), and a thermally conductive member (13). The electrode assembly (11) comprises a main body part (111) and tabs (112) connected to the main body part (111), the main body part (111) and the tabs (112) being both provided in the casing (12). The thermally conductive member (13) is arranged in the casing (12), and is at least partially arranged around the periphery of the main body part (111). The thermal conductivity of the thermally conductive member (13) is greater than the thermal conductivity of the casing (12). Providing the thermally conductive member (13) can increase the rate at which the heat inside the main body part (111) is diffused to the casing (12) and is then released, thereby effectively reducing a temperature difference between the interior of the main body part (111) and the casing (12).

Description

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

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a related device, an energy storage system and a charging network. BACKGROUND

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

[0003] In some cases, the battery cell generates a large amount of heat during operation, which causes the electrode assembly to accumulate a large amount of heat inside. This can easily lead to a large temperature difference between the inside of the electrode assembly and the shell, thereby affecting the performance and service life of the battery cell.

[0004] SUMMARY

[0005] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, 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 cell.

[0006] The technical solution adopted by the embodiments of the present application is as follows:

[0007] In a first aspect, the embodiments of the present application provide a battery cell, comprising:

[0008] a shell;

[0009] an electrode assembly comprising a main body portion and a tab connected to the main body portion, both of which are arranged in the shell;

[0010] a heat-conducting member arranged 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.

[0011] The battery cell provided by the embodiments of the present application has a heat-conducting member arranged in the shell of the battery cell, 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. In this way, the rate at which the heat inside the main body portion spreads to the shell and is then released can be accelerated, 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 cell and helping to improve the performance and service life of the battery cell.

[0012] In some embodiments, the electrode assembly has a winding structure with a winding axis, the main body portion has a 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.

[0013] 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.

[0014] 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.

[0015] 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. 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. 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.

[0016] 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.

[0017] In this way, the heat conducting member can conduct the heat inside the main body portion of the multiple electrode assemblies, 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.

[0018] In some embodiments, the heat conducting member comprises:

[0019] a first heat conducting portion surrounding the outer periphery of the main body portion of the multiple electrode assemblies;

[0020] a second heat conducting portion arranged between the main body portions of two adjacent electrode assemblies and connected to the first heat conducting portion.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] In some embodiments, the first size is greater than or equal to 0.8 times the second size.

[0026] 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.

[0027] In some embodiments, in the first direction, the heat conduction member is flush with or exceeds at least one end of the main body.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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;

[0032] 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.

[0033] 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.

[0034] 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;

[0035] The battery monomer further comprises a second insulating member, which is arranged at the end of the main body portion having the tab in the first direction;

[0036] 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.

[0037] By adopting the above technical solutions, on the one hand, the efficiency of the heat-conducting member in conducting the heat inside the electrode assembly out can be improved, so that 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. 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.

[0038] 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 that of the first insulating member;

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] By adopting the technical scheme, the heat conduction member and the third insulation member can be arranged flexibly.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In some embodiments, the heat-conducting member is an integral connection structure.

[0056] 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.

[0057] In some embodiments, the heat-conducting rate of the heat-conducting member is greater than or equal to 100 W / m·K.

[0058] In this way, the heat-conducting member has a large heat-conducting rate, which facilitates the heat-conducting member to 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.

[0059] In some embodiments, the heat-conducting rate of the heat-conducting member is greater than or equal to 1000 W / m·K.

[0060] In this way, the heat conduction member has a large heat conductivity, and the heat conduction member can conduct heat in the main body part to the shell, so that the temperature difference between the electrode assembly and the shell can be effectively reduced, and the use performance and service life of the battery cell can be improved.

[0061] In some embodiments, the heat conduction member comprises a protective layer, a heat conduction layer, and an adhesive layer, and the heat conduction layer is arranged between the protective layer and the adhesive layer.

[0062] By using the above technical solution, the heat conduction member can be fixed in the shell by the adhesive layer, so that the heat conduction member can stably realize the heat conduction effect, thereby effectively reducing the temperature difference between the electrode assembly and the shell, and improving the use performance and service life of the battery cell.

[0063] In some embodiments, the adhesive layer is arranged on the side of the heat conduction layer close to the main body part and is adhered to the main body part.

[0064] By using the above technical solution, on the one hand, the heat conduction member can be fixed in 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 in contact with the main body part, so that the heat conduction effect on the main body part can be effectively realized. In this way, the temperature difference between the electrode assembly and the shell can be effectively reduced, and the use performance and service life of the battery cell can be improved.

[0065] In a second aspect, the embodiments of the present application provide a battery device, comprising a battery cell.

[0066] The battery device provided by the embodiments of the present application can improve the heat dissipation performance of the battery cell by using the battery cell related by the above embodiments, which helps to improve the use performance and service life of the battery cell, and thus improves the use performance and service life of the battery device.

[0067] In some embodiments, at least one end of the main body part 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 part relative to the first direction; the battery device further comprises a first heat management component, and the first heat management component is located outside the shell, and the distribution direction of the first heat management component intersects the first direction.

[0068] By arranging at least part of the heat conduction member around the outer periphery of the main body part relative to the first direction, and by arranging the distribution direction of the first heat management component to intersect the first direction, the first heat management component can efficiently perform heat management with the heat conduction member, so that the efficiency of the heat conduction member in conducting heat in the main body part can be improved, the temperature difference between the main body part and the shell can be effectively reduced, the heat dissipation performance of the battery cell can be improved, and the use performance and service life of the battery cell can be improved, thereby improving the use performance and service life of the battery device.

[0069] In some embodiments, the tab is arranged at one end of the main body along the first direction, and the 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 comprises a second thermal management component, which is arranged at the end of the main body away from the tab along the first direction and outside the shell.

[0070] By arranging the 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 thermal management component at the end of the main body away from the tab along the first direction, the second thermal management component can efficiently perform thermal management on the heat conduction member, so as to improve the efficiency of the heat conduction member in conducting heat inside the main body, effectively reduce the temperature difference between the inside of the main body and the shell, and improve the heat dissipation performance of the battery monomer, which helps to improve the use performance and service life of the battery monomer, thereby improving the use performance and service life of the battery device.

[0071] In a third aspect, the embodiments of the present application provide an energy storage device, including a battery monomer or a battery device.

[0072] 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 related in the above embodiments.

[0073] In a fourth aspect, the embodiments of the present application provide an energy storage system, including a power conversion device and an energy storage device, and the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0074] 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 related in the above embodiments.

[0075] In a fifth aspect, the embodiments of the present application provide an electric device, including a battery monomer or a battery device or an energy storage device or an energy storage system.

[0076] 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 related in the above embodiments.

[0077] In a sixth aspect, the embodiments of the present application provide a charging network, including a charging pile and an energy storage device or an energy storage system, and the energy storage device is used to provide electric energy for the charging pile.

[0078] 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 related in the above embodiments.

[0079] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and 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 will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0080] 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 exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0081] Fig. 1 is a schematic diagram of an energy storage system provided by some embodiments of the present application;

[0082] Fig. 2 is a schematic diagram of a charging network provided by some embodiments of the present application;

[0083] Fig. 3 is a schematic diagram of a vehicle provided by some embodiments of the present application;

[0084] Fig. 4 is an exploded view of a battery device provided by some embodiments of the present application;

[0085] Fig. 5 is a perspective structural view of a battery cell provided by some embodiments of the present application;

[0086] Fig. 6 is an exploded view of the battery cell provided by Fig. 5;

[0087] Fig. 7 is a sectional view of Fig. 5 along A-A;

[0088] Fig. 8 is an enlarged view of B in Fig. 7;

[0089] Fig. 9 is an exploded view of a battery cell provided by some other embodiments of the present application;

[0090] Fig. 10 is a sectional view of the battery cell provided by Fig. 9 after assembly;

[0091] Fig. 11 is an enlarged view of C in Fig. 10;

[0092] Fig. 12 is a schematic diagram of Fig. 10 under some other embodiments;

[0093] Fig. 13 is an enlarged view of D in Fig. 12;

[0094] Fig. 14 is an exploded view of a battery cell provided by some other embodiments of the present application;

[0095] Fig. 15 is a sectional view of the battery cell provided by Fig. 14 after assembly;

[0096] Fig. 16 is an enlarged view of E in Fig. 15;

[0097] Fig. 17 is a sectional view of Fig. 5 along F-F;

[0098] Fig. 18 is a schematic view of Fig. 17 in another embodiment;

[0099] Fig. 19 is an enlarged view of G in Fig. 18;

[0100] Fig. 20 is a schematic view of Fig. 17 in yet another embodiment;

[0101] Fig. 21 is an enlarged view of H in Fig. 20;

[0102] Fig. 22 is a schematic view of Fig. 17 in still another embodiment;

[0103] Fig. 23 is a schematic view of Fig. 17 in other embodiments;

[0104] Fig. 24 is an enlarged view of I in Fig. 17;

[0105] Fig. 25 is a partial sectional view of a battery device provided by some embodiments of the present application.

[0106] In the drawings, like reference numerals refer to like elements throughout.

[0107] 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 - casing; 122 - end cover; 13 - heat-conducting member; 13a - first heat-conducting member; 13b - second heat-conducting member; 131 - first heat-conducting part; 132 - second heat-conducting part; 133 - third heat-conducting part; 134 - fourth heat-conducting part; 135 - fifth heat-conducting part; 136 - protective layer; 137 - heat-conducting 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

[0108] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the drawings to refer to the same or like elements or elements having the same or similar functionality. The embodiments described below are illustrative examples of how the present application can be put into practice, and should not be construed as limiting the present application in any way.

[0109] If there is no special description, all the embodiments and optional embodiments of the embodiments of the application can be combined to form new technical solutions.

[0110] If there is no special description, all the technical features and optional technical features of the embodiments of the application can be combined to form new technical solutions.

[0111] In the description of the embodiments of the 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 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 a limitation to the application.

[0112] 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.

[0113] In the description of the embodiments of the 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.

[0114] In the description of the embodiments of the 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 application can be understood according to the specific circumstances.

[0115] Although the application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent parts can be substituted for the parts therein. In particular, the technical features mentioned in each embodiment can be combined in any way, as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0116] 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.

[0117] 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.

[0118] Based on the above considerations, 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 rate of the heat-conducting member is greater than that of the case. At least part of the heat-conducting member surrounds the outer periphery of the body portion of the electrode assembly. This allows 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 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. This can improve the heat dissipation performance of the battery cell and help improve the performance and lifespan of the battery cell.

[0119] It should be noted that the related device can include a battery device, a power consumption device, and an energy storage device.

[0120] The battery cell referred to in 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. The secondary battery refers to a battery cell that can be activated by charging after discharging.

[0121] 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.

[0122] The battery device referred to in 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, in parallel, or in a mixed connection through a busbar. The mixed connection means that the multiple battery cells are connected in series and in parallel.

[0123] 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 a battery module. As an example, the multiple battery cells can be fixed to form a battery module by a cable tie or the like. As an example, the multiple battery cells can also be fixed to form a battery module by an end plate, a side plate, or the like.

[0124] 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, a plurality of battery cells can first form one or more battery modules, and then be accommodated in the cabinet.

[0125] The battery cell and the battery device involved in the embodiments of the present application can be used in an energy storage device using the battery cell or the battery device as an energy storage element.

[0126] The energy storage device involved in the embodiments of the present application can be an energy storage container or an energy storage cabinet.

[0127] 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 electrical energy at an appropriate time. For example, the energy storage device can store electrical energy at a low electricity consumption valley, and provide electrical energy for related users or electrical devices at a high electricity consumption peak.

[0128] The energy storage device can include one or more battery clusters, and the battery cluster includes a plurality of battery devices.

[0129] In some embodiments, in the battery cluster, the plurality of battery devices can be connected in series through a current collection component to improve the voltage of the energy storage device.

[0130] In some embodiments, when the energy storage device includes a plurality of battery clusters, the plurality of battery clusters can be connected in parallel to improve the capacity of the energy storage device.

[0131] In some embodiments, the energy storage device can further include a cabinet body, and the battery cluster is accommodated in the cabinet body.

[0132] 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 and a fire-fighting module, etc.

[0133] In some embodiments, the thermal management module can include a liquid cooling unit, and the liquid cooling unit provides a cooling liquid for adjusting the temperature of the battery cell to each battery device through a pipeline.

[0134] In some embodiments, the master control module can serve as a battery management unit of the battery cluster, and be used 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 and voltage of the battery cluster. The master control module includes a slave battery management unit (SBMU) and a fusion switch module.

[0135] In some embodiments, the general control module can serve as a battery management unit of the energy storage device, for monitoring and managing the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the general control module can control the charging and discharging current, voltage, etc. of the energy storage device. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) and fiber conversion module, etc.

[0136] 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.

[0137] In some embodiments, the power distribution module can be used to distribute power to the modules that need power in the energy storage device.

[0138] The energy storage system related to the embodiments of the present application can be any power system that needs to use an energy storage device.

[0139] In some embodiments, referring to FIG. 1, FIG. 1 is a schematic diagram of an energy storage system 1000 provided by some embodiments of the present application. The energy storage system 1000 related to the embodiments of the present application can include an energy storage device 100 and a power conversion device 1100 (PCS), and the power conversion device 1100 is used to be 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 the energy storage device 100 can be one or more.

[0140] As an example, the power generation device 1200 can be a solar panel, a water power generation device, a fire power generation device, a wind power generation device, etc.

[0141] In some embodiments, referring to FIG. 2, FIG. 2 is a schematic diagram of a charging network 2000 provided by some embodiments of the present application. The charging network 2000 related to the embodiments of the present application can include a charging pile 2100 and an energy storage device 100, and 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.

[0142] 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.

[0143] The charging pile 2100 can have one or more connectors 2200 for connecting with an electric device (such as a vehicle) so as to supply power to the electric device.

[0144] The energy storage device 100 can be located inside the charging pile 2100 (such as a charging and storage integrated machine) or outside the charging pile 2100.

[0145] The battery monomer and the battery device provided by the embodiments of the present application can also be used in an electric device using the battery monomer or the battery device as a power source.

[0146] 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. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, 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 electric car or a range extended car, etc. According to the driving mode, the vehicle can be a front-wheel drive car, a rear-wheel drive car or a four-wheel drive car.

[0147] For ease of description, the embodiments of the present application take the electric device as a vehicle for example.

[0148] In some embodiments, referring to FIG. 3, FIG. 3 is a schematic diagram of a vehicle 3000 provided by some embodiments of the present application. The vehicle 3000 is internally provided with a battery device 10, which can be arranged at the bottom, 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 an operating power source of the vehicle 3000. The vehicle 3000 can further include a controller 3100 and a motor 3200, the controller 3100 being 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.

[0149] In some embodiments, the battery device 10 can not only be used as an operating power source of the vehicle 3000, but also be used as a 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.

[0150] In some embodiments, referring to FIG. 4, FIG. 4 is an exploded view of the battery device 10 provided by some embodiments of the present application. The battery device 10 can include a box 2 and a battery monomer 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 monomer 1.

[0151] The box 2 can have 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 overlapped with each other and jointly define an internal space of the box 2, and the internal space of the box 2 is a closed space. Here, the 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.

[0152] In some embodiments, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 can be a plate structure, the second part 22 is overlapped with 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, referring to FIG. 4, the first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the opening side of the first part 21 is overlapped with 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. In some embodiments, the box 2 composed of the first part 21 and the second part 22 can have various shapes, such as a cylinder, a cuboid, etc.

[0153] In some embodiments, referring to FIG. 4, the plurality of battery monomers 1 can be connected in series, in parallel or in a mixed manner to form a whole, and then the whole formed by the plurality of battery monomers 1 is directly accommodated in the internal space of the box 2. In some other embodiments, the plurality of battery monomers 1 can be connected in series, in parallel or in a mixed manner, and then arranged and fixed to form a battery module, and the battery module is accommodated in the internal space of the box 2. In some other embodiments, the plurality of battery monomers 1 can be connected in series, in parallel or in a mixed manner, and then arranged and fixed to form a plurality of battery modules, and the plurality of battery modules are connected in series, in parallel or in a mixed manner to form a whole, and then the whole is accommodated in the internal space of the box 2.

[0154] In some embodiments, referring to FIG. 3 and FIG. 4, the box 2 of the battery device 10 can be part of the chassis structure of the vehicle 3000. For example, part of the box 2 can be at least part of the floor of the vehicle 3000, or part of the box 2 can be at least part of the cross beam and the longitudinal beam of the vehicle 3000.

[0155] In some embodiments, referring to FIG. 5 and FIG. 6, FIG. 5 is a perspective view of the battery monomer 1 provided in some embodiments of the present application, and FIG. 6 is an exploded view of the battery monomer 1 provided in FIG. 5. The battery monomer 1 provided in some embodiments of the present application can include an electrode assembly 11 and a housing 12.

[0156] The electrode assembly 11 is a component in which electrochemical reactions occur in the battery cell 1. The electrode assembly 11 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials, which constitute a main body 111 of the electrode assembly 11, and portions without active materials, which each constitute a tab 112. The tab 112 of the positive electrode sheet is a positive electrode tab, and the tab 112 of the negative electrode sheet is a negative electrode tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body 111 together, as shown in FIG. 6, or the positive electrode tab and the negative electrode tab can be located at opposite ends of the main body 111, respectively.

[0157] The number of the electrode assembly 11 in the battery cell 1 can be one or multiple.

[0158] In some cases, the electrode assembly 11 can also be referred to as a bare cell, a winding body, a stacking body, or the like.

[0159] In some embodiments, the battery cell 1 can further include an electrolyte, which plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. The electrolyte involved in the embodiments of the present application can be in a liquid state, a gel state, or a solid state.

[0160] The shell 12 is used to define an internal environment of the battery cell 1, and the shell 12 is used to accommodate the electrode assembly 11 and the electrolyte.

[0161] In some embodiments, referring to FIG. 6, the shell 12 can include a shell body 121 and an end cover 122, which are components used to define the internal environment of the battery cell 1 together, and the internal environment defined by the shell body 121 and the end cover 122 is used to accommodate the electrode assembly 11 and the electrolyte. The shell body 121 and the end cover 122 can be independent components. Specifically, the shell body 121 has an opening, and the end cover 122 is arranged at the opening of the shell body 121 to define the internal environment of the battery cell 1 together with the shell body 121, and to isolate the internal environment of the battery cell 1 from the external environment. Alternatively, the shell body 121 and the end cover 122 can be an integrated structure. Specifically, the end cover 122 and the shell body 121 can form a common connecting surface before the electrode assembly 11 is put into the shell, and the end cover 122 is then closed to the shell body 121 when the electrode assembly 11 needs to be encapsulated.

[0162] The shell 12 can be a sealed structure or a non-sealed structure. As an example, when the shell 12 is a sealed structure, the shell 12 can serve to protect the electrode assembly 11 and prevent, to some extent, leakage of electrolyte and the like. As an example, when the shell 12 is a non-sealed structure, the shell 12 can serve to protect the electrode assembly 11, and a sealing bag can be further included between the shell 12 and the electrode assembly 11 to encapsulate the electrode assembly 11, electrolyte, and the like. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum plastic film, or the like.

[0163] The number of the end cap 122 can be one, as shown in FIG. 6. Alternatively, the number of the end cap 122 can be two, and the two end caps 122 can be respectively arranged at opposite ends of the shell 121.

[0164] The shell 121 can have a cylindrical shape, a square shape, or the like, and the specific shape and size of the shell 121 can be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 121 and the end cap 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0165] Referring to FIGS. 5 to 8, FIG. 7 is a cross-sectional view of FIG. 5 along A-A, and FIG. 8 is an enlarged view of B in FIG. 7. The battery cell 1 according to an embodiment of the disclosure includes an electrode assembly 11, a shell 12, and a heat-conducting member 13. The electrode assembly 11 includes a main body 111 and a tab 112 connected to the main body 111, and the main body 111 and the tab 112 are disposed in the shell 12. The heat-conducting member 13 is disposed in the shell 12 and at least partially surrounds an outer periphery of the main body 111, and the heat-conducting member 13 has a higher thermal conductivity than the shell 12.

[0166] The heat-conducting member 13 refers to a member having a heat-conducting property and can serve to conduct heat to the main body 111. The heat-conducting member 13 can be a thin film structure independently disposed with respect to the shell 12 and the main body 111, or can be a coating layer disposed between the shell 12 and the main body 111.

[0167] The heat-conducting member 13 is disposed in the shell 12 and at least partially surrounds the outer periphery of the main body 111, which means that the heat-conducting member 13 is disposed between the shell 12 and the main body 111, and at least a portion of the heat-conducting member 13 surrounds the outer periphery of the main body 111.

[0168] The at least partial surrounding of the outer periphery of the main body portion 111 by the heat conduction member 13 is at least a portion of the at least partial surrounding of the outer periphery of the main body portion 111 by the heat conduction member 13. It can be understood that the two ends of the heat conduction member 13 can be connected or overlap with other portions of the heat conduction member 13. In other words, in the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13, the length of the heat conduction member 13 along the surrounding direction of the heat conduction member 13 can be greater than or equal to the circumference of the main body portion 111 surrounded by the heat conduction member 13, so that the heat conduction member 13 is substantially annular and at least surrounds one turn. The two ends of the heat conduction member 13 can also be arranged without overlapping with other portions of the heat conduction member 13. In other words, in the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13, the length of the heat conduction member 13 along the surrounding direction of the heat conduction member 13 can be less than the circumference of the main body portion 111 surrounded by the heat conduction member 13, so that the heat conduction member 13 is substantially "C" shaped and the heat conduction member 13 surrounds a portion of the outer periphery of the main body portion 111. Among them, the two ends of the heat conduction member 13 are the opposite ends of the heat conduction member 13 along the surrounding direction, and the surrounding direction of the heat conduction member 13 can be substantially the circumferential direction of the heat conduction member 13. Among them, the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13 is substantially similar to the cross section in FIGS. 7 and 8, and can be specifically referred to each other.

[0169] The at least partial surrounding of the outer periphery of the main body portion 111 by the heat conduction member 13 is at least a portion of the at least partial surrounding of the outer periphery of the main body portion 111 by the heat conduction member 13. It can be understood that the two ends of the heat conduction member 13 can be connected or overlap with other portions of the heat conduction member 13. In other words, in the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13, the length of the heat conduction member 13 along the surrounding direction of the heat conduction member 13 can be greater than or equal to the circumference of the main body portion 111 surrounded by the heat conduction member 13, so that the heat conduction member 13 is substantially annular and at least surrounds one turn. The two ends of the heat conduction member 13 can also be arranged without overlapping with other portions of the heat conduction member 13. In other words, in the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13, the length of the heat conduction member 13 along the surrounding direction of the heat conduction member 13 can be less than the circumference of the main body portion 111 surrounded by the heat conduction member 13, so that the heat conduction member 13 is substantially "C" shaped and the heat conduction member 13 surrounds a portion of the outer periphery of the main body portion 111. Among them, the two ends of the heat conduction member 13 are the opposite ends of the heat conduction member 13 along the surrounding direction, and the surrounding direction of the heat conduction member 13 can be substantially the circumferential direction of the heat conduction member 13. Among them, the cross section of the battery monomer 1 parallel to the surrounding direction of the heat conduction member 13 is substantially similar to the cross section in FIGS. 7 and 8, and can be specifically referred to each other.

[0170] The heat conductivity of the heat conduction member 13 is greater than the heat conductivity of the shell 12, which means that the heat conduction performance of the heat conduction member 13 is better than the heat conduction performance of the shell 12. Therefore, compared with the shell 12, the heat conduction member 13 can more quickly conduct the heat inside the main body portion 111 away, so that the heat of the main body portion 111 can be more quickly spread.

[0171] The battery monomer 1 provided by the embodiments of the present application sets the heat-conducting member 13 in the shell 12 of the battery monomer 1, the heat conductivity of the heat-conducting member 13 is greater than that of the shell 12, and 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, so that the heat on the main body part 111 can be efficiently conducted to the heat-conducting member 13 and then to the shell 12 through the heat-conducting member 13. In this way, the rate of heat diffusion from the inside of the main body part 111 to the shell 12 for further release can be accelerated, thereby effectively reducing the temperature difference between the inside of the main body part 111 and the shell 12, improving the heat dissipation performance of the battery monomer 1, and helping to improve the use performance and service life of the battery monomer 1.

[0172] In some embodiments, please refer to FIGS. 5 to 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.

[0173] As shown in FIG. 6, it can be understood that the positive and negative electrode tabs 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 and negative electrode tabs 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.

[0174] 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.

[0175] The center axis L is parallel to the first direction Z and passes through the main body part 111 along the first direction Z.

[0176] Therefore, 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, so that the circumferential direction of the heat-conducting member 13 is substantially perpendicular to the first direction Z, and at least part of the heat-conducting member 13 is arranged around the center axis L. It can be understood that the cross section of the battery monomer 1 parallel to the circumferential direction of the heat-conducting member 13 is substantially perpendicular to the first direction Z, in other words, the plane formed by the circumferential direction of the heat-conducting member 13 (i.e. the circumferential direction) is substantially perpendicular to the first direction Z.

[0177] By adopting the above technical solution, the at least part of the heat conduction member 13 is arranged around the outer periphery of the main body portion 111 relative to the first direction Z, so that the heat conduction member 13 and the main body portion 111 have a relatively large relative area, which facilitates improving the efficiency of the heat conduction member 13 in conducting heat inside the main body portion 111. In addition, the heat conduction member 13 and the shell 12 also have a relatively large relative area, which facilitates improving the efficiency of the heat conduction member 13 in conducting heat to the shell 12. In this way, the temperature difference between the inside of the main body portion 111 and the shell 12 can be effectively reduced, and the use performance and service life of the battery monomer 1 can be improved.

[0178] In other embodiments, the main body portion 111 is provided with the above-mentioned tab 112 at least one end along the first direction Z, and at least part of the heat conduction member 13 can also be arranged around the outer periphery of the main body portion 111 relative to the other direction intersecting the first direction Z.

[0179] In some embodiments, please refer to FIGS. 5 to 8, and other drawings. The electrode assembly 11 is a winding structure, and the winding structure has a winding axial direction Z1. The main body portion 111 is provided with the tab 112 at least one end along the winding axial direction Z1, and at least part of the heat conduction member 13 is arranged around the outer periphery of the main body portion 111 relative to the winding axial direction Z1.

[0180] It can be understood that the positive electrode tab, the negative electrode tab and the separator of the electrode assembly 11 are arranged around the central axis L to form the electrode assembly 11 by winding, so that the electrode assembly 11 is a winding 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 axial direction Z1. The winding axial direction Z1 is parallel to the central axis L.

[0181] It can be understood that when the electrode assembly 11 is a winding structure, the above-mentioned first direction Z is the winding axial direction Z1.

[0182] The positive electrode tab 112 and the negative electrode tab 112 can be arranged at one end of the main body portion 111 along the winding axial direction Z1, as shown in FIG. 6. Alternatively, the positive electrode tab 112 and the negative electrode tab 112 are arranged at opposite ends of the main body portion 111 along the winding axial direction Z1, respectively.

[0183] The outer periphery of the main body portion 111 relative to the winding axial direction Z1 refers to the outer periphery of the main body portion 111 around the central axis L. The plane formed by the winding direction of the main body portion 111 is substantially perpendicular to the winding axial direction Z1.

[0184] The at least part of the heat conduction member 13 arranged around the outer periphery of the main body portion 111 relative to the winding axial direction Z1 is that the plane in which the winding direction of the heat conduction member 13 is located is substantially perpendicular to the winding axial direction Z1.

[0185] As shown in FIG. 7, the cross section of the main body 111 perpendicular to the winding axis Z1 can be substantially square and combined with semicircles at both ends. The cross section of the main body 111 perpendicular to the winding axis Z1 can also be substantially circular.

[0186] It should be noted that the electrode assembly 11 is arranged in a winding structure, so that it is very difficult to conduct heat inside the electrode assembly 11. The battery monomer 1 provided by the embodiment of the application can make the heat conduction member 13 and the main body 111 have a larger relative area by at least partially surrounding the outer periphery of the main body 111 relative to the winding axis Z1, so that the heat conduction member 13 can better conduct the heat inside the main body 111. And also make the heat conduction member 13 and the shell 12 have a larger relative area, so that the heat conduction member 13 can better conduct heat to the shell 12. By such arrangement, 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 monomer 1 can be improved.

[0187] In other embodiments, the positive electrode sheet and the negative electrode sheet can be arranged in a stacked manner, so that the electrode assembly 11 is substantially in a stacked structure. The diaphragm can be arranged in a winding manner or a stacked manner.

[0188] In some embodiments, please refer to FIGS. 6-8, and combine with other drawings. The number of heat conduction members 13 and the number of electrode assemblies 11 are both multiple, and at least part of each heat conduction member 13 surrounds the outer periphery of the main body 111 of each electrode assembly 11.

[0189] As shown in FIGS. 6-8, the number of heat conduction members 13 and the number of electrode assemblies 11 are the same, the heat conduction members 13 and the electrode assemblies 11 correspond one by one, and at least part of each heat conduction member 13 surrounds the outer periphery of the main body 111 of each electrode assembly 11.

[0190] For ease 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 includes 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 111 of each electrode assembly 11. The third heat conduction part 133 is at least part of the first heat conduction member 13a, has heat conduction performance, and the heat conductivity of the third heat conduction part 133 is greater than that of the shell 12.

[0191] As an example, as shown in FIGS. 6-8, at least part of each heat conduction member 13 surrounds the outer periphery of the main body 111 of each electrode assembly 11 relative to the first direction Z.

[0192] As an example, as shown in FIGS. 6-8, the plurality of electrode assemblies 11 are distributed along the second direction Y.

[0193] The heat-conducting member 13 is arranged at least partially around the outer periphery of the main body part 111 of the electrode assembly 11, so that the heat-conducting member 13 can conduct the heat inside the main body part 111 of the electrode assembly 11. In this way, two layers of heat-conducting members 13 are arranged between the main body parts 111 of two adjacent electrode assemblies 11, so that the heat between the main body parts 111 of the two adjacent electrode assemblies 11 can be conducted. In this way, the efficiency of the heat-conducting member 13 in conducting 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 performance and service life of the battery cell 1 can be improved.

[0194] In some embodiments, please refer to FIGS. 9-16, and in combination with other drawings. FIG. 9 is an exploded view of a battery cell 1 according to some embodiments of the present application, FIG. 10 is a cross-sectional view of the battery cell 1 along C-C after assembly according to FIG. 9, and FIG. 11 is an enlarged view of D in FIG. 10. FIG. 12 is a schematic view of FIG. 10 according to some embodiments, and FIG. 13 is an enlarged view of E in FIG. 12. FIG. 14 is an exploded view of a battery cell 1 according to some other embodiments of the present application, FIG. 15 is a cross-sectional view of the battery cell 1 along F-F after assembly according to FIG. 14, and FIG. 16 is an enlarged view of G in FIG. 15. The number of electrode assemblies 11 is a plurality, and the heat-conducting member 13 is arranged at least partially around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11.

[0195] For the convenience of description, the heat-conducting member 13 is defined as a second heat-conducting member 13b, and the second heat-conducting member 13b is arranged at least partially around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11.

[0196] As an example, as shown in FIGS. 9-16, the plurality of electrode assemblies 11 are distributed along the second direction Y, and the heat-conducting member 13 is arranged at least partially around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11 relative to the first direction Z.

[0197] 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, so as to help reduce the temperature difference between the combined structure of the plurality of electrode assemblies 11 and the shell 12, and improve the performance and service life of the battery cell 1.

[0198] 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.

[0199] In some cases, the first direction Z can be a height direction of the electrode assembly 11, the second direction Y can be a thickness direction of the electrode assembly 11, and the third direction X can be a width direction of the electrode assembly 11. Among them, the thickness of the electrode assembly 11 is less than the width of the electrode assembly 11.

[0200] In some embodiments, please refer to FIG. 12 and FIG. 13, and combine with other drawings. The heat conduction member 13 includes a first heat conduction part 131 and a second heat conduction part 132. The first heat conduction part 131 is arranged around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11. The second heat conduction part 132 is arranged between the main body parts 111 of the adjacent two electrode assemblies 11 and connected to the first heat conduction part 131.

[0201] It can be understood that the above-mentioned second heat conduction member 13b includes the above-mentioned first heat conduction part 131 and the second heat conduction part 132. The first heat conduction part 131 and the second heat conduction part 132 are two parts of the second heat conduction member 13b, both of which have heat conduction performance. And the thermal conductivity of the first heat conduction part 131 and the thermal conductivity of the second heat conduction part 132 are both greater than the thermal conductivity of the shell 12.

[0202] The first heat conduction part 131 and the second heat conduction part 132 can be integrally formed or connected in parts.

[0203] By arranging the first heat conduction part 131 around the outer periphery of the main body part 111 of the plurality of electrode assemblies 11, the first heat conduction part 131 can conduct the heat inside the main body part 111 to the shell 12. By arranging the second heat conduction part 132 between the main body parts 111 of the adjacent two electrode assemblies 11 and connecting it to the first heat conduction part 131, the heat between the main body parts 111 of the adjacent two electrode assemblies 11 can be conducted out through the second heat conduction part 132 and then conducted out to the shell 12 through the first heat conduction part 131. In other words, the second heat conduction part 132 and the first heat conduction part 131 can cooperate to conduct the heat inside the combined structure formed by the plurality of electrode assemblies 11 to the shell 12. In this way, the heat conduction efficiency of the heat conduction member 13 in conducting the heat inside the combined structure formed by the plurality of electrode assemblies 11 can be improved, thereby effectively reducing the temperature difference between the inside of the combined structure formed by the plurality of electrode assemblies 11 and the shell 12, and improving the performance and life of the battery monomer 1.

[0204] In some embodiments, please refer to FIG. 6 and FIG. 17, and combine with other drawings. FIG. 17 is a sectional view of FIG. 5 along H-H. The main body part 111 is provided with a tab 112 at least at one end along the first direction Z, and at least 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.

[0205] The size of the orthographic projection of the heat conduction member 13 on the first direction Z on the main body part 111 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 is greater than or equal to 0.3 times the second size H2.

[0206] Specifically, the first size H1 can be 0.3 times the second size H2, 0.35 times the second size H2, 0.4 times the second size H2, 0.45 times the second size H2, 0.5 times the second size H2, 0.55 times the second size H2, 0.6 times the second size H2, 0.65 times the second size H2, 0.7 times the second size H2, 0.75 times the second size H2, 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, or the second size H2, and the first size H1 can also be greater than the second size H2.

[0207] By adopting the above technical solution, the part of the heat conduction member 13 opposite to the main body part 111 has a larger size on the first direction Z, so that the heat conduction member 13 and the main body part 111 have a larger relative area, which facilitates improving 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. And, the part of the heat conduction member 13 opposite to the shell 12 has a larger size on the first direction Z, so that the heat conduction member 13 and the shell 12 have a larger relative area, which facilitates 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.

[0208] In some embodiments, please refer to FIG. 17, and combine with other drawings. The first size H1 is greater than or equal to 0.8 times the second size H2.

[0209] 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, or the second size H2, and the first size H1 can also be greater than the second size H2.

[0210] In this way, the heat conduction member 13 and the main body part 111, and the heat conduction member 13 and the shell 12 all have a larger 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.

[0211] In some embodiments, please refer to FIG. 17 and FIG. 18, and combine with other drawings. FIG. 18 is a schematic diagram of FIG. 17 in other embodiments. In the first direction Z, the heat-conducting member 13 is flush with or exceeds at least one end of the main body part 111.

[0212] As shown in FIG. 17, in the first direction Z, one end of the heat-conducting member 13 can be flush with one end of the main body part 111. Alternatively, as shown in FIG. 18, in the first direction Z, one end of the heat-conducting member 13 can exceed one end of the main body part 111.

[0213] As shown in FIG. 17 and FIG. 18, in the first direction Z, the other end of the heat-conducting member 13 can exceed the other end of the main body part 111. Alternatively, in the first direction Z, the other end of the heat-conducting member 13 can be flush with the other end of the main body part 111.

[0214] By using the above technical solutions, the relative area between the heat-conducting member 13 and the main body part 111 and between the heat-conducting member 13 and the shell 12 is large. 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.

[0215] In some embodiments, please refer to FIG. 6 to FIG. 16, and combine with other drawings. The battery monomer 1 further comprises a first insulating member 14, at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111, and the thermal conductivity of the heat-conducting member 13 is greater than the thermal conductivity of the first insulating member 14.

[0216] The first insulating member 14 refers to an insulating structure for protecting the main body part 111 and achieving the insulation protection effect between the shell 12 and the main body part 111.

[0217] At least part of the first insulating member 14 arranged around the outer periphery of the main body part 111 means that at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of at least one electrode assembly 11. That is, at least part of one first insulating member 14 can be arranged around the outer periphery of the main body part 111 of one electrode assembly 11, and at least part of one first insulating member 14 can also be arranged around the outer periphery of the main body part 111 of a plurality of electrode assemblies 11.

[0218] As an example, as shown in FIG. 6 to FIG. 16, at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 relative to the first direction Z.

[0219] The thermal conductivity of the heat conducting member 13 is greater than the thermal conductivity of the first insulating member 14, so that the heat conducting performance of the heat conducting member 13 is superior to the insulation performance of the first insulating member 14. Understandably, when the heat conducting member 13 is the first heat conducting member 13a, the thermal conductivity of the first heat conducting member 13a is greater than the thermal conductivity of the first insulating member 14, and specifically, the thermal conductivity of the third heat conducting part 133 is greater than the thermal conductivity of the first insulating member 14. When the heat conducting member 13 is the second heat conducting member 13b, the thermal conductivity of the second heat conducting member 13b is greater than the thermal conductivity of the first insulating member 14, and specifically, the thermal conductivity of the first heat conducting part 131 and the thermal conductivity of the second heat conducting part 132 are both greater than the thermal conductivity of the first insulating member 14.

[0220] In some possible designs, the first insulating member 14 can be, but is not limited to, a Mylar film.

[0221] In some possible designs, as shown in FIGS. 6-13, the heat conducting member 13 is arranged between the main body part 111 and the first insulating member 14.

[0222] 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. The heat conducting member 13 is arranged between the main body part 111 and the first insulating member 14, so that the heat conducting member 13 can be close to or even contact the main body part 111, which can improve the efficiency of heat conduction from the inside of the main body part 111 to the heat conducting member 13, 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, thereby effectively reducing the temperature difference between the inside of the electrode assembly 11 and the shell 12.

[0223] 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 then 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.

[0224] In some possible designs, as shown in FIGS. 14-16, the first insulating member 14 is arranged between the heat conducting member 13 and the main body part 111.

[0225] By adopting the above technical solution, the positional 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. In addition, the first insulating member 14 can stably realize the insulation effect between the main body part 111 and the shell 12.

[0226] In some embodiments, referring to Figs. 6-16, in combination with other figures, the number of electrode assemblies 11 is plural, and at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11.

[0227] As an example, as shown in Figs. 6-16, at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11 with respect to the first direction Z.

[0228] In some possible designs, as shown in Figs. 6-13, the heat conducting member 13 is arranged between the main body part 111 and the first insulating member 14.

[0229] In this case, the heat conducting member 13 can be the first heat conducting member 13a described above, as shown in Figs. 6-8, the number of the first heat conducting member 13a is plural, the third heat conducting part 133 of each first heat conducting member 13a is arranged around the outer periphery of the main body part 111 of each electrode assembly 11, the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, and is arranged around the outer periphery of the plural first heat conducting members 13a. The heat conducting member 13 can also be the second heat conducting member 13b described above, as shown in Figs. 9-13, at least part of the second heat conducting member 13b is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, and is arranged around the outer periphery of the second heat conducting member 13b.

[0230] In some possible designs, as shown in Figs. 14-16, at least part of the heat conducting member 13 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, and the first insulating member 14 is arranged between the heat conducting member 13 and the main body part 111.

[0231] In this case, the heat conducting member 13 is the second heat conducting member 13b described above, at least part of the second heat conducting member 13b is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, and is arranged around the outer periphery of the first insulating member 14.

[0232] By adopting the above technical solutions, when the number of electrode assemblies 11 is plural, and at least part of the first insulating member 14 is arranged around the outer periphery of the main body part 111 of the plural electrode assemblies 11, the heat conducting member 13 and the first insulating member 14 can be arranged flexibly, so that the heat conducting 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.

[0233] In some embodiments, when the number of electrode assemblies 11 is plural, the number of first insulating members 14 can also be plural, and each first insulating member 14 is arranged around the outer periphery of the main body part 111 of each electrode assembly 11.

[0234] Based on this, in some possible designs, the heat-conducting member 13 can be arranged between the main body part 111 and the first insulating member 14.

[0235] In some possible designs, the heat-conducting member 13 can be a first heat-conducting member 13a, the first heat-conducting member 13a can be arranged at least partially around the outer periphery of the main body part 111 of each electrode assembly 11, and the first insulating member 14 can be arranged between the main body part 111 of each electrode assembly 11 and the first heat-conducting member 13a. That is, the first heat-conducting member 13a can be arranged around the outer periphery of the main body part 111 of each electrode assembly 11, and around the outer periphery of the first insulating member 14.

[0236] In some possible designs, the first insulating member 14 can be arranged between the main body part 111 and the heat-conducting member 13.

[0237] In some possible designs, the heat-conducting member 13 can be a first heat-conducting member 13a, the first heat-conducting member 13a can be arranged at least partially around the outer periphery of the main body part 111 of each electrode assembly 11, and the first insulating member 14 can be arranged between the main body part 111 of each electrode assembly 11 and the first heat-conducting member 13a. That is, the first heat-conducting member 13a can be arranged around the outer periphery of the main body part 111 of each electrode assembly 11, and around the outer periphery of the first insulating member 14.

[0238] The heat-conducting member 13 can also be a second heat-conducting member 13b, the second heat-conducting member 13b can be arranged at least partially around the outer periphery of the main body part 111 of each of the plurality of electrode assemblies 11, and around the outer periphery of the plurality of first insulating members 14. As an example, the second heat-conducting member 13b can include a first heat-conducting part 131 and a second heat-conducting part 132. The first heat-conducting part 131 can be arranged around the outer periphery of the main body part 111 of each of the plurality of electrode assemblies 11, and around the outer periphery of the plurality of first insulating members 14. The second heat-conducting part 132 can be arranged between the main body part 111 of each of the two adjacent electrode assemblies 11, and between the two adjacent first insulating members 14.

[0239] In some embodiments, please refer to FIG. 6, FIG. 18 to FIG. 21, and in combination with other drawings. In FIG. 19 is an enlarged view of I in FIG. 18, FIG. 20 is a schematic view of FIG. 17 in some other embodiments, and FIG. 21 is an enlarged view of J in FIG. 20. The main body part 111 is provided with the above-mentioned tab 112 at at least one end in 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.

[0240] The battery monomer 1 also includes a second insulating member 15. In the first direction Z, the second insulating member 15 is arranged at the end of the main body part 111 having the tab 112.

[0241] The second insulating member 15 refers to a component with insulating properties, mainly used to achieve the insulating effect between the electrode assembly 11 and the shell 12.

[0242] It can be understood that, in the first direction Z, the second insulating member 15 is arranged between the main body part 111 and the shell 12.

[0243] In some possible designs, the second insulating member 15 can be but is not limited to a plastic.

[0244] As shown in FIG. 6, the positive and negative electrode tabs 112 are arranged at one end of the main body part 111 along the first direction Z, the second insulating member 15 is arranged at the end of the main body part 111 with the positive and negative electrode tabs 112, and is arranged between the main body part 111 and the shell 12 along the first direction Z. Alternatively, the positive and negative electrode tabs 112 can be arranged at opposite ends of the main body part 111 along the first direction Z, and the number of the second insulating member 15 is two, and the two second insulating members 15 are arranged at the opposite ends of the main body part 111 along the first direction Z, respectively.

[0245] It should be noted here that the thermal conductivity of the heat-conducting member 13 is greater than the thermal conductivity of the second insulating member 15.

[0246] It should be noted that the heat-conducting member 13 can extend beyond the end of the main body part 111 close to the second insulating member 15 along the first direction Z. For ease of description, the part of the heat-conducting member 13 extending beyond the end of the main body part 111 close to the second insulating member 15 along the first direction Z is defined as a fourth heat-conducting part 134, and the heat-conducting member 13 comprises the fourth heat-conducting part 134. The fourth heat-conducting part 134 is part of the heat-conducting member 13 and also has the heat-conducting performance. The thermal conductivity of the fourth heat-conducting part 134 is greater than the thermal conductivity of the shell 12, greater than the thermal conductivity of the first insulating member 14, and greater than the thermal conductivity of the second insulating member 15.

[0247] When the heat-conducting member 13 is the first heat-conducting member 13a, the fourth heat-conducting part 134 and the third heat-conducting part 133 are distributed along the first direction Z and connected. When the heat-conducting member 13 is the second heat-conducting member 13b, the fourth heat-conducting part 134 and the first heat-conducting part 131 are distributed along the first direction Z and connected.

[0248] In some possible designs, as shown in FIGS. 18 and 19, in the first direction Z, part of the heat-conducting member 13 is arranged between the second insulating member 15 and the main body part 111.

[0249] It can be understood that the fourth heat-conducting part 134 of the heat-conducting member 13 is arranged at the end of the main body part 111 close to the second insulating member 15 along the first direction Z, and is arranged between the main body part 111 and the second insulating member 15 along the first direction Z.

[0250] In this way, the heat-conducting member 13 can conduct the heat of the main body portion 111 to the outside along 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 along 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 along the first direction Z, and the portion of the heat-conducting member 13 outside the end of the main body portion 111 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 along the first direction Z, which facilitates the arrangement of the heat-conducting member 13 in the shell 12.

[0251] In some possible designs, as shown in FIGS. 20 and 21, the heat-conducting member 13 can be arranged between the outer periphery of the second insulating member 15 relative to the first direction Z and the shell 12.

[0252] It can be understood that the fourth heat-conducting portion 134 at least 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.

[0253] In this way, the size of the heat-conducting member 13 along 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 along 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 along the first direction Z, and at least part of the portion of the heat-conducting member 13 outside the end of the main body portion 111 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.

[0254] 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 along 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 along the first direction Z, and the portion of the heat-conducting member 13 outside the end of the main body portion 111 can be arranged reasonably, which facilitates the arrangement of the heat-conducting member 13 in the shell 12.

[0255] In some embodiments, please refer to FIGS. 18-21, 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 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. Wherein, the first insulating member 14 involved in the embodiments of the present application is the same as the first insulating member 14 in each of the above embodiments, which will not be repeated here.

[0256] In some possible designs, as shown in FIGS. 18 and 19, 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, a portion of the thermal conductive member 13 is disposed between the second insulating member 15 and the main body portion 111.

[0257] It can be understood that the fourth thermal conductive portion 134 is disposed between the main body portion 111 and the second insulating member 15 along the first direction Z.

[0258] 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 disposed between the main body portion 111 and the first insulating member 14 along the first direction Z.

[0259] In this way, when the thermal conductive member 13 is disposed 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 disposed between the main body portion 111 and the first insulating member 14 along the first direction Z, which facilitates the arrangement of the thermal conductive member 13 in the housing 12.

[0260] In some possible designs, as shown in FIGS. 20 and 21, the first insulating member 14 is disposed between the thermal conductive member 13 and the main body portion 111, and a portion of the thermal conductive member 13 is disposed between the outer periphery of the second insulating member 15 relative to the first direction Z and the housing 12.

[0261] In this way, when the first insulating member 14 is disposed 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 housing 12, which facilitates the arrangement of the thermal conductive member 13 in the housing 12.

[0262] By adopting the above technical solution, when the heat conduction member 13 has a large size along the first direction Z, part of the heat conduction member 13 can be arranged outside the main body part 111 along the first direction Z towards the second insulation part 15, and is arranged reasonably, thereby facilitating the arrangement of the heat conduction member 13 in the shell 12.

[0263] In some embodiments, as shown in FIG. 17 and FIG. 22, and in combination with other drawings. Wherein, FIG. 22 is a schematic diagram of FIG. 17 in some other embodiments. When the heat conduction member 13 is arranged between the first insulation part 14 and the main body part 111, the heat conduction member 13 can not be arranged outside the main body part 111 along the first direction Z towards the second insulation part 15, i.e., the fourth heat conduction part 134 is not formed, as shown in FIG. 17. When the first insulation part 14 is arranged between the main body part 111 and the heat conduction member 13, the heat conduction member 13 can not be arranged outside the main body part 111 along the first direction Z towards the second insulation part 15, i.e., the fourth heat conduction part 134 is not formed.

[0264] In some embodiments, please refer to FIG. 6, FIG. 17 to FIG. 23, and in combination with other drawings. Wherein, FIG. 23 is a schematic diagram of FIG. 17 in some other embodiments. 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 around the outer periphery of the main body part 111 relative to the first direction Z. Part of the heat conduction member 13 is arranged between the end of the main body part 111 away from the tab 112 along the first direction Z and the shell 12.

[0265] It can be understood that the heat conduction member 13 is arranged outside the end of the main body part 111 away from the tab 112 along the first direction Z. For the convenience of description, the part of the heat conduction member 13 arranged outside the end of the main body part 111 away from the tab 112 along the first direction Z is defined as the fifth heat conduction part 135, and the heat conduction member 13 includes the fifth heat conduction part 135. Wherein, the fifth heat conduction part 135 is part of the heat conduction member 13 and also has heat conduction performance. Wherein, the thermal conductivity of the fifth heat conduction part 135 is greater than the thermal conductivity of the shell 12, and is greater than the thermal conductivity of the first insulation part 14, and is also greater than the thermal conductivity of the second insulation part 15.

[0266] Wherein, when the heat conduction member 13 is the first heat conduction member 13a, the fifth heat conduction part 135 and the third heat conduction part 133 are distributed along the first direction Z and are connected. And the fourth heat conduction part 134 and the fifth heat conduction part 135 are respectively connected to the opposite ends of the third heat conduction part 133 along the first direction Z.

[0267] 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.

[0268] As shown in FIGS. 17-23, and in conjunction with other figures. 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.

[0269] By using 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 from the inside of the main body part 111 to the shell 12. In this way, the efficiency of the heat conducting member 13 conducting heat from the inside of 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.

[0270] In some embodiments, please refer to FIGS. 17-23, and in conjunction with other figures. 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.

[0271] 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.

[0272] 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.

[0273] It is to be understood 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.

[0274] In some possible designs, as shown in FIGS. 17-19, and in conjunction 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.

[0275] 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 along the first direction Z, such that the third insulating member 16 is disposed between the fifth thermal conductive portion 135 and the outer shell 12 along the first direction Z.

[0276] In some possible designs, as shown in FIGS. 20-23, and in conjunction 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.

[0277] 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 along the first direction Z, such that the fifth thermal conductive portion 135 is disposed between the third insulating member 16 and the outer shell 12 along the first direction Z.

[0278] By employing the above technical solutions, the thermal conductive member 13 and the third insulating member 16 can be flexibly arranged.

[0279] In some embodiments, please refer to the figures, and in conjunction with other figures. The battery cell 1 further includes 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.

[0280] In some possible designs, as shown in FIGS. 17-19, and in conjunction 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.

[0281] 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.

[0282] In some possible designs, as shown in FIGS. 6, 17-19, and in combination with other drawings. A part of the first insulating member 14 can be arranged between an 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.

[0283] In some possible designs, as shown in FIGS. 20-23, and in combination with FIG. 6 and other drawings. 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.

[0284] It can be understood that the fifth heat conduction part 135 is arranged between a 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.

[0285] 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 the heat of 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.

[0286] 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 paste, a nano-carbon copper foil, and a nano-carbon aluminum foil.

[0287] 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.

[0288] By adopting the above technical solutions, 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] In some embodiments, referring to FIG. 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.

[0293] 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.

[0294] 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.

[0295] In some embodiments, the heat conduction member 13 is an integral connection structure.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] In some embodiments, the thermal conductivity of the heat conduction piece 13 is ≥100 W / m·K.

[0300] 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.

[0301] 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.

[0302] In some embodiments, the thermal conductivity of the heat conduction piece 13 is ≥1000 W / m·K.

[0303] 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.

[0304] 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.

[0305] In some embodiments, refer to FIG. 24, and combine with other figures. Wherein, FIG. 24 is an enlarged view of K in FIG. 17. The heat conduction piece 13 comprises a protective layer 136, a heat conduction layer 137, and an adhesive layer 138, the heat conduction layer 137 is arranged between the protective layer 136 and the adhesive layer 138.

[0306] The protective layer 136 refers to a structural 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 adhered to the heat conduction layer 137.

[0307] The heat conduction layer 137 refers to a structural 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.

[0308] The adhesive layer 138 refers to a structural layer with adhesive capacity, wherein the adhesive layer 138 is arranged on the side of the heat conduction layer 137 away from the protective layer 136. Wherein, the side of the adhesive layer 138 away from the heat conduction layer 137 can be used for adhesion. 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 adhered.

[0309] 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 electrode assembly 11 inside and the shell 12, and improving the use performance and life of the battery monomer 1.

[0310] In some embodiments, refer to FIG. 24, and combine with other figures. The adhesive layer 138 is arranged on the side of the heat conduction layer 137 close to the main body part 111.

[0311] When the heat conduction piece 13 is arranged between the first insulating piece 14 and the main body part 111, as shown in FIGS. 6-13 and 17-19, and combine with other figures, the adhesive layer 138 of the heat conduction piece 13 can be adhered to the main body part 111.

[0312] When the heat conduction piece 13 is the first heat conduction piece 13a, the third heat conduction part 133 is adhered 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 adhered to the main body part 111 through the adhesive layer 138.

[0313] When the heat-conducting member 13 comprises 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 comprises 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.

[0314] When the first insulating member 14 is arranged between the heat-conducting member 13 and the main body part 111, as shown in FIGS. 14-16 and 20-22, 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.

[0315] 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.

[0316] When the heat-conducting member 13 comprises 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 comprises 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.

[0317] When the heat-conducting member 13 replaces the first insulating member 14, as shown in FIG. 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.

[0318] 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.

[0319] In some embodiments, as shown in FIGS. 6-13 and 17-19, 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.

[0320] In this way, the heat conduction member 13 can be arranged very close to or even in contact with the main body 111, so that the heat conduction 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 shell 12 can be effectively reduced, and the service performance and service life of the battery monomer 1 can be improved.

[0321] In some embodiments, the thickness of the heat conduction 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.

[0322] Please refer to FIG. 4 and FIG. 25, and combine with other drawings. FIG. 25 is a partial cross-sectional view of the battery device 10 provided in some embodiments of the present application. The battery device 10 provided in the embodiments of the present application includes the battery monomer 1. The battery monomer 1 in the embodiments is the same as the battery monomer 1 in the above embodiments, and the related description of the battery monomer 1 in the above embodiments is referred to.

[0323] The battery device 10 provided in 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, and improve the service performance and service life of the battery device 10.

[0324] In some embodiments, please refer to FIG. 4 and FIG. 25, and combine with other drawings. The main body 111 is provided with the tab 112 at least at one end along the first direction Z, and at least part of the heat conduction 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 the first heat management component 3, which is located outside the shell 12, and the distribution direction of the first heat management component 3 and the shell 12 intersects the first direction Z.

[0325] 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, for heat management of the battery monomer 1.

[0326] It can be understood that the distribution direction of the first heat management component 3 and the shell 12 intersects the first direction Z, which means that the distribution direction of the first heat management component 3 and the shell 12 can form an included angle greater than 0° and less than 180° with the first direction Z, that is, the distribution direction of the first heat management component 3 and the shell 12 is not parallel to the first direction Z. The distribution direction of the first heat management component 3 and the shell 12 can be perpendicular to the first direction Z, or not perpendicular to the first direction Z. The distribution direction of the first heat management component 3 and the shell 12 can be coplanar with the first direction Z, or not coplanar with the first direction Z.

[0327] As an example, the first thermal management component 3 and the shell 12 can be distributed along the above-mentioned second direction Y, as shown in FIG. 25. As an example, the first thermal management component 3 and the shell 12 can also be distributed along the above-mentioned third direction X.

[0328] By arranging at least part of the heat conduction member 13 around the outer periphery of the main body portion 111 relative to the first direction Z, and the distribution direction of the first thermal management component 3 and the shell 12 intersecting the first direction Z, the first thermal management component 3 can be efficiently thermally managed with the heat conduction member 13, so as to improve the efficiency of the heat conduction member 13 in conducting heat inside the main body portion 111, effectively reduce the temperature difference between the inside of the main body portion 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.

[0329] In some embodiments, referring to FIG. 25, and in combination with other drawings. The tab 112 is arranged at one end of the main body portion 111 along the first direction Z, and part of the heat conduction member 13 is arranged at the end of the main body portion 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 portion 111 away from the tab 112 along the first direction Z, and outside the shell 12.

[0330] It can be understood that the heat conduction member 13 can surround the outer periphery of the main body portion 111, so that part of the heat conduction member 13 is arranged at the end of the main body portion 111 away from the tab 112 along the first direction Z. Alternatively, as shown in FIG. 25, and in combination with other drawings, part of the heat conduction member 13 is arranged around the outer periphery of the main body portion 111 relative to the first direction Z, and part of the heat conduction member 13 is arranged at the end of the main body portion 111 away from the tab 112 along the first direction Z.

[0331] 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 be circulated in the flow channel inside the second thermal management component 4, so as to achieve thermal management of the battery monomer 1.

[0332] By arranging part of the heat conduction member 13 at the end of the main body portion 111 away from the tab 112 along the first direction Z, and the second management component at the end of the main body portion 111 away from the tab 112 along the first direction Z, the second thermal management component 4 can be efficiently thermally managed with the heat conduction member 13, so as to improve the efficiency of the heat conduction member 13 in conducting heat inside the main body portion 111, effectively reduce the temperature difference between the inside of the main body portion 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.

[0333] 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 the battery monomer 1 and the battery device 10 in the above embodiments, and details can be referred to the related description of the battery monomer 1 and the battery device 10 in the above embodiments, which will not be repeated here.

[0334] 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 the battery monomer 1 and the battery device 10 in the above embodiments, and details can be referred to the related description of the battery monomer 1 and the battery device 10 in the above embodiments, which will not be repeated here.

[0335] Please refer to FIG. 1 and 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 for electrically connecting the power generation device 1200 and the energy storage device 100. The energy storage device 100 in the embodiment is the same as the energy storage device 100 in the above embodiments, and details can be referred to the related description of the energy storage device 100 in the above embodiments, which will not be repeated here.

[0336] 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 for electrically connecting the power generation device 1200 and the energy storage device 100. The energy storage device 100 in the embodiment is the same as the energy storage device 100 in the above embodiments, and details can be referred to the related description of the energy storage device 100 in the above embodiments, which will not be repeated here.

[0337] Please refer to FIG. 3 and other drawings. The power consumption device provided by the embodiment of the present application comprises the battery monomer 1, the battery device 10, the energy storage device 100 or the energy storage system 1000. The battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the embodiment are the same as the battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the above embodiments, and details can be referred to the related description of the battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the above embodiments, which will not be repeated here.

[0338] The power consumption device provided by the embodiment of the present application comprises the battery monomer 1, the battery device 10, the energy storage device 100 or the energy storage system 1000. The battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the embodiment are the same as the battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the above embodiments, and details can be referred to the related description of the battery monomer 1, the battery device 10, the energy storage device 100 and the energy storage system 1000 in the above embodiments, which will not be repeated here.

[0339] Please refer to FIG. 2 and other drawings. The charging network 2000 provided by the embodiment of the present application comprises the charging pile 2100, and further comprises the energy storage device 100 or the energy storage system 1000, and the energy storage device 100 is used for providing electric energy for the charging pile 2100. The energy storage device 100 and the energy storage system 1000 in the embodiment are the same as the energy storage device 100 and the energy storage system 1000 in the above embodiments, and details can be 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.

[0340] The charging pile 2100 provided by the embodiments of the present application, by adopting the energy storage device 100 or the energy storage system 1000 related in the above embodiments, helps to improve the use performance and service life of the charging network 2000.

[0341] As one of the embodiments of the present application, as shown in FIGS. 5 to 8, the battery monomer 1 includes an electrode assembly 11, a shell 12, a heat conduction member 13 and a 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 a main body part 111 and a 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 members 13 is multiple, and the number of the electrode assemblies 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 greater than the heat conductivity of the first insulation member 14.

[0342] The above is only an optional embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A battery cell (1), wherein The battery monomer (1) comprises: a shell (12); an electrode assembly (11) comprising a main body part (111) and a tab (112) connected to the main body part (111), both of which are arranged in the shell (12); a heat conduction member (13) arranged in the shell (12) and at least partially surrounding the outer periphery of the main body part (111); the heat conductivity of the heat conduction member (13) is greater than that of the shell (12).

2. The battery cell (1) according to claim 1, wherein The electrode assembly (11) is in a winding structure, the winding structure has a winding axial direction (Z1), at least one end of the main body part (111) along the winding axial direction (Z1) is provided with the tab (112), and at least part of the heat conduction member (13) surrounds the outer periphery of the main body part (111) relative to the winding axial direction (Z1).

3. The battery cell (1) according to claim 1 or 2, wherein The number of the heat conduction member (13) and the electrode assembly (11) is multiple, at least part of each heat conduction member (13) surrounds the outer periphery of the main body part (111) of each electrode assembly (11).

4. The battery cell (1) according to claim 1 or 2, wherein The number of the electrode assembly (11) is multiple, and at least part of the heat conduction member (13) surrounds the outer periphery of the main body part (111) of the multiple electrode assemblies (11).

5. The battery cell (1) according to claim 4, wherein The heat conduction member (13) comprises: a first heat conduction part (131) surrounding the outer periphery of the main body part (111) of the multiple electrode assemblies (11); a second heat conduction part (132) arranged between the main body parts (111) of two adjacent electrode assemblies (11) and connected to the first heat conduction part (131).

6. The battery cell (1) according to any one of claims 1-5, wherein At least one end of the main body part (111) along a first direction (Z) is provided with the tab (112), and at least part of the heat conduction member (13) surrounds the outer periphery of the main body part (111) relative to the first direction (Z); The size of the orthographic projection of the heat conduction member (13) on the main body part (111) in the first direction (Z) is a first size (H1), and the size of the main body part (111) in the first direction (Z) is a second size (H2), and the first size (H1) is greater than or equal to 0.3 times the second size (H2).

7. The battery cell (1) according to claim 6, wherein The first size (H1) is greater than or equal to 0.8 times the second size (H2).

8. The battery cell (1) according to claim 6 or 7, wherein 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).

9. The battery cell (1) according to any one of claims 1-8, wherein The battery monomer (1) further comprises a first insulation member (14), at least part of which surrounds the outer periphery of the main body part (111), and the heat conductivity of the heat conduction member (13) is greater than that of the first insulation member (14); the first insulation member (14) is arranged between the heat conduction member (13) and the main body part (111), or the heat conduction member (13) is arranged between the main body part (111) and the first insulation member (14).

10. The battery cell (1) according to claim 9, wherein The number of the electrode assembly (11) is plural, and at least a part of the first insulating member (14) is disposed around the outer periphery of the main body portion (111) of the plural electrode assemblies (11); At least a part of the heat conducting member (13) is disposed around the outer periphery of the main body portion (111) with respect to the first direction (Z), and the first insulating member (14) is disposed between the heat conducting member (13) and the main body portion (111); or the heat conducting member (13) is disposed between the main body portion (111) and the first insulating member (14).

11. The battery cell (1) according to any one of claims 1-10, wherein The main body portion (111) is provided with the tab (112) at at least one end in the first direction (Z), and at least a part of the heat conducting member (13) is disposed around the outer periphery of the main body portion (111) with respect to the first direction (Z); The battery cell (1) further includes a second insulating member (15), which is disposed at one end of the main body portion (111) having the tab (112) in the first direction (Z); A part of the heat conducting member (13) is disposed between the outer periphery of the second insulating member (15) with respect to the first direction (Z) and the case (12); or in the first direction (Z), a part of the heat conducting member (13) is disposed between the second insulating member (15) and the main body portion (111).

12. The battery cell (1) according to claim 11, wherein The battery cell (1) further includes a first insulating member (14), at least a part of which is disposed around the outer periphery of the main body portion (111) with respect to the first direction (Z), and the thermal conductivity of the heat conducting member (13) is greater than that of the first insulating member (14); The first insulating member (14) is disposed between the heat conducting member (13) and the main body portion (111), and a part of the heat conducting member (13) is disposed between the outer periphery of the second insulating member (15) with respect to the first direction (Z) and the case (12); or the heat conducting member (13) is disposed between the main body portion (111) and the first insulating member (14), and in the first direction (Z), a part of the heat conducting member (13) is disposed between the second insulating member (15) and the main body portion (111).

13. The battery cell (1) according to any one of claims 1-12, wherein The tab (112) is disposed at one end of the main body portion (111) in the first direction (Z), a part of the heat conducting member (13) is disposed around the outer periphery of the main body portion (111) with respect to the first direction (Z), and a part of the heat conducting member (13) is disposed between the end of the main body portion (111) away from the tab (112) in the first direction (Z) and the case (12).

14. The battery cell (1) according to claim 13, wherein The battery cell (1) further includes a third insulating member (16), which is disposed between the end of the main body portion (111) away from the tab (112) in the first direction (Z) and the case (12); The tab (112) is disposed at one end of the main body portion (111) in the first direction (Z), a part of the heat conducting member (13) is disposed around the outer periphery of the main body portion (111) with respect to the first direction (Z), and a part of the heat conducting member (13) is disposed between the end of the main body portion (111) away from the tab (112) in the first direction (Z) and the case (12). In the first direction (Z), the third insulating member (16) is arranged between the main body portion (111) and the heat conductive member (13); or, in the first direction (Z), at least part of the heat conductive member (13) is arranged between the third insulating member (16) and the main body portion (111).

15. The battery cell (1) according to claim 14, wherein The battery cell (1) further comprises a first insulating member (14), at least part 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 heat conductive member (13) is greater than the thermal conductivity of the first insulating member (14); The first insulating member (14) is arranged between the heat conductive member (13) and the main body portion (111), and in the first direction (Z), the third insulating member (16) is arranged between the main body portion (111) and the heat conductive member (13); or, the heat conductive member (13) is arranged between the main body portion (111) and the first insulating member (14), and in the first direction (Z), at least part of the heat conductive member (13) is arranged between the main body portion (111) and the third insulating member (16).

16. The battery cell (1) according to any one of claims 1-15, wherein The heat conductive member (13) comprises at least one of a graphene film, a copper foil, an aluminum foil, a graphite heat dissipation paste, a nano-carbon copper foil, and a nano-carbon aluminum foil.

17. The battery cell (1) according to any one of claims 1-16, wherein At least part of the heat conductive member (13) is an insulating structure to achieve insulation between the main body portion (111) and the shell (12).

18. The battery cell (1) according to any one of claims 1-8, wherein At least one of the side of the heat conductive member (13) close to the main body portion (111) and the side of the heat conductive member (13) close to the shell (12) is an insulating structure, and the heat conductive member (13) contacts the main body portion (111) and the shell (13).

19. The battery cell (1) according to any one of claims 1-18, wherein The heat conductive member (13) is an integral connection structure.

20. The battery cell (1) according to any one of claims 1-19, wherein The thermal conductivity of the heat conductive member (13) is ≥100 W / m·K.

21. The battery cell (1) according to claim 20, wherein The thermal conductivity of the heat conductive member (13) is ≥1000 W / m·K.

22. The battery cell (1) according to any one of claims 1-21, wherein The heat conductive member (13) comprises a protective layer (136), a heat conductive layer (137), and an adhesive layer (138), the heat conductive layer (137) is arranged between the protective layer (136) and the adhesive layer (138).

23. The battery cell (1) according to claim 22, wherein The adhesive layer (138) is arranged on the side of the heat conductive layer (137) close to the main body portion (111) and adheres to the main body portion (111).

24. A battery device (10), wherein The battery cell (1) according to any one of claims 1-23.

25. The battery device (10) according to claim 24, wherein At least one end of the main body portion (111) along the first direction (Z) is provided with the tab (112), and at least part of the heat conductive member (13) is arranged around the outer periphery of the main body portion (111) relative to the first direction (Z); the battery device (10) further comprises a first thermal management component (3), the first thermal management component (3) is located outside the shell (12), and the distribution direction of the first thermal management component (3) and the shell (12) intersects the first direction (Z).

26. The battery device (10) according to claim 24 or 25, wherein The tab (112) is arranged at one end of the main body (111) along a first direction (Z), and a part of the heat conduction member (13) is arranged at an end of the main body (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 an end of the main body (111) away from the tab (112) along the first direction (Z) and outside the shell (12).

27. An energy storage device (100), wherein, The battery device (10) according to any one of claims 24-26.

28. An energy storage system (1000), wherein, The energy storage device (100) according to claim 27 is electrically connected to a power conversion device (1100) and a power generation device (1200).

29. An electrical device, comprising: The energy storage device (100) according to claim 27 is electrically connected to a power conversion device (1100) and a power generation device (1200).

30. A charging network (2000), wherein The energy storage device (100) according to claim 27 is electrically connected to a power conversion device (1100) and a power generation device (1200). The energy storage device (100) according to claim 27 is electrically connected to a power conversion device (1100) and a power generation device (1200).

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