Battery monomer, battery device and electric equipment

Abstract

The embodiment of the invention provides a battery monomer, a battery device and electric equipment, and belongs to the technical field of batteries. The battery monomer comprises a shell; the electrode assembly is arranged in the shell; the pole column is arranged on the shell, and the pole column is electrically connected with the electrode assembly; the heat conduction piece is arranged outside the shell; wherein the heat conduction piece is connected with the pole and the shell, and the heat conduction piece is used for transferring heat of the pole to the shell; the heat conduction piece is provided with a heat conduction cavity, a capillary structure is arranged in the heat conduction cavity, and the heat conduction cavity is filled with a phase change medium, so that the cooling effect on the pole is improved, and the use reliability of the battery is further improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] However, during the rapid charging process, the battery cell pole will generate a lot of heat, which will cause the local temperature of the battery to rise sharply, which will seriously affect the performance and service life of the battery, and even cause a major safety hazard during the use of the battery. Therefore, how to improve the reliability of battery use is a technical problem that needs to be solved urgently in battery technology. Summary of the invention In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment to improve the cooling effect of the pole, thereby improving the reliability of the battery.

[0004] In a first aspect, the present application provides a battery cell, comprising: shell; An electrode assembly is disposed in the housing; A pole, disposed on the housing, the pole being electrically connected to the electrode assembly; and A heat conducting member, disposed outside the housing; The heat conducting member connects the pole and the shell, and is used to transfer the heat of the pole to the shell; the heat conducting member has a heat conducting cavity, a capillary structure is arranged in the heat conducting cavity, and the heat conducting cavity is filled with a phase change medium.

[0005] In the technical solution of the embodiment of the present application, a heat conductor is connected between the pole and the outer shell, and the phase change medium in the heat conduction cavity flows between the capillary structures to transfer high temperature to low temperature, so that the heat of the pole can be transferred to the outer shell through the heat conductor, thereby improving the cooling effect on the pole and further improving the reliability of the battery.

[0006] In some embodiments, the heat conductor includes a first connecting section, a second connecting section and a heat transfer section, the heat transfer section is connected between the first connecting section and the second connecting section, the first connecting section is attached to the pole, and the second connecting section is attached to the shell.

[0007] The first connecting section is attached to the pole and the second connecting section is attached to the shell, so that the heat conducting member is connected between the pole and the shell, so that the heat of the pole can be transferred to the shell through the heat conducting member, thereby improving the cooling effect on the pole.

[0008] In some embodiments, the pole includes an end face and a side face, the end face is used to connect to a bus bar, the side face intersects with the end face, and the first connecting section is attached to the side face.

[0009] The first connecting section is attached to the side surface of the pole to achieve connection between the first connecting section and the pole, while avoiding interference with the connection between the end surface of the pole and the busbar.

[0010] In some embodiments, the heat conductor is insulated and connected to the pole.

[0011] By making the heat-conducting member and the pole insulated and connected, the occurrence of short circuit phenomenon is reduced while the heat-conducting member and the pole are connected.

[0012] In some embodiments, the battery cell further includes an insulating member, at least a portion of which is disposed between the pole and the housing; The heat conducting member is connected to the insulating member.

[0013] Since at least part of the insulating member is arranged between the pole and the shell, the heat of the pole can be transferred to the insulating member. Then, through the connection between the heat conductive member and the insulating member, the heat transferred to the insulating member can be transferred to the heat conductive member and then to the shell, thereby cooling the pole.

[0014] In some embodiments, the housing includes a first wall and a second wall, the pole is disposed on the first wall, the heat conductor connects the pole and the second wall, and the heat conductor is used to transfer heat of the pole to the second wall.

[0015] Since the pole is arranged on the first wall and the heat conductor connects the pole and the second wall, the pole can directly transfer part of the heat to the first wall while transferring the rest of the heat to the second wall through the heat conductor, thereby accelerating the heat dissipation of the pole.

[0016] In some embodiments, the housing includes a shell and an end cap, the shell having a receiving cavity and an opening communicating with the receiving cavity, the electrode assembly is disposed in the receiving cavity, and the end cap is connected to the shell and covers the opening; The end cover is the first wall, and the shell includes the second wall.

[0017] By setting the end cover as the first wall and making the shell include the second wall, when the pole is set on the end cover, the heat of the pole can be transferred to the shell through the heat conductive member, thereby improving the cooling effect on the pole.

[0018] In some embodiments, the housing includes a side wall and a bottom wall, one end of the side wall is connected to the bottom wall, the side wall and the bottom wall form the accommodating cavity, and the other end of the side wall forms the opening; The side wall or the bottom wall is the second wall.

[0019] By setting the side wall or the bottom wall as the second wall, when the pole is set on the end cover, the heat of the pole can be transferred to the side wall or the bottom wall through the heat conductive member, thereby improving the cooling effect on the pole.

[0020] In some embodiments, the heat conducting member is a heat pipe.

[0021] The heat conducting member is arranged as a heat pipe to realize heat transfer by utilizing the characteristics of the heat pipe.

[0022] In some embodiments, the poles are provided with two, and the two poles include a positive pole and a negative pole; Two heat conducting members are provided, one of which is connected between the positive electrode post and the shell, and the other is connected between the negative electrode post and the shell. A heat conducting member is connected between each pole and the shell respectively, so that each pole can be transferred to the shell through the corresponding heat conducting member, thereby realizing heat dissipation of each pole.

[0023] In a second aspect, the present application provides a battery device, which includes the battery cell in the above embodiment.

[0024] The battery device provided in the present application includes the battery cell described in any one of the first aspect embodiments, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail herein.

[0025] In some embodiments, the battery device further includes a thermal management component, the housing includes a first wall and a second wall, the pole is disposed on the first wall, the second wall is thermally connected to the thermal management component, and the thermal conductor connects the pole and the second wall.

[0026] Since the pole is arranged on the first wall, and the heat conducting member connects the pole and the second wall, the pole can directly transfer part of the heat to the first wall, while the rest of the heat can be transferred to the second wall through the heat conducting member. At this time, the second wall can be cooled by the heat management member connected to the second wall, thereby accelerating the heat dissipation of the pole.

[0027] In some embodiments, the second wall is disposed adjacent to the first wall, and the second wall has the largest outer surface area among all the walls of the housing.

[0028] By arranging the second wall adjacent to the first wall, the length of the heat conductor can be shortened. Meanwhile, by using the wall with the largest outer surface area among the walls of the housing as the second wall, the heat dissipation area of ​​the second wall can be increased, thereby improving the cooling effect on the pole.

[0029] In some embodiments, the second wall is disposed opposite to the first wall along a first direction.

[0030] By arranging the second wall opposite to the first wall, the heat of the pole can be transferred to the wall of the housing away from the pole, thereby achieving heat dissipation of the pole.

[0031] In some embodiments, the battery cells are provided in plurality, and the plurality of battery cells are arranged along a second direction, and the second direction is perpendicular to the first direction; The battery device further comprises a heat insulating pad, which is arranged between two adjacent battery cells, and the heat insulating pad is provided with an escape groove, in which the heat conducting member is partially accommodated.

[0032] When a plurality of battery cells are arranged along the second direction and the second wall is arranged opposite to the first wall, an avoidance groove is provided on the thermal insulation pad between two adjacent battery cells to provide an avoidance space for the installation of the heat conductive component, so that the heat conductive component can be connected to the opposite sides of the outer shell to realize heat transfer between the pole and the second wall.

[0033] In a third aspect, the present application provides an electrical device, which includes the battery device in the above embodiment, or includes the battery cell in the above embodiment.

[0034] The electrical equipment provided in the present application includes the battery cell described in any one of the first aspect embodiments, or includes the battery device described in the second aspect embodiments, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail herein.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application; Figure 2 is a schematic diagram of the exploded structure of a battery device in some embodiments of the present application; Figure 3 Schematic diagram of the exploded structure of a battery cell in some embodiments of the present application (when no heat conducting member is provided); Figure 4 A schematic diagram of the structure of a battery cell in some embodiments of the present application (when a heat conducting member is provided and assembled with a thermal management component); Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle; Figure 6 Schematic diagram of the structure of the heat conducting member in the battery cell in some embodiments of the present application.

[0037] The reference numerals in the specific implementation manner are as follows: 1000. Vehicles; 100, battery device; 200, controller; 300, motor; 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. Shell; 21a. First wall; 21b. Second wall; 211. End cover; 212. Shell; 2121. Side wall; 2122. Bottom wall; 22. Electrode assembly; 23. Post; 23a. Positive post; 23b. Negative post; 231. End face; 232. Side face; 24. Insulator; 25. Heat-conducting member; 25a. First connecting section; 25b. Second connecting section; 25c. Heat-transfer section; 251. Shell; 2511. Heat-conducting cavity; 252. Liquid-absorbing core; 30. Thermal management components. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] At the same time, with the rapid development of new energy vehicles, the market share of new energy vehicles is getting higher and higher. How to quickly and efficiently achieve energy replenishment is an urgent problem to be solved in the new energy vehicle industry. As a mainstream solution for new energy vehicles to achieve rapid energy replenishment, power battery fast charging has encountered many challenges in the implementation process.

[0045] Specifically, during the rapid charging process, the battery cells of the power battery will generate a large amount of heat at the poles, which will cause the local temperature of the battery to rise sharply, thereby seriously affecting the performance and service life of the battery, and may even cause major safety hazards during the use of the battery, which is not conducive to the safety of consumers.

[0046] In order to improve the heat dissipation of the pole, research has found that a heat-conducting structure can be set between the pole and the outer shell of the battery cell to quickly conduct the heat of the pole to the outer shell of the battery cell, avoiding excessive local temperature of the battery, thereby improving the performance and service life of the battery.

[0047] Based on the above considerations, in order to solve the problem of excessive pole temperature during fast charging of a battery cell, a battery cell is designed, in which a heat conductor is connected between the pole and the outer shell, so that the heat of the pole can be transferred to the outer shell through the heat conductor, thereby improving the cooling effect on the pole and thereby improving the reliability of the battery.

[0048] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery device disclosed in the present application.

[0049] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0050] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0051] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used for powering the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000, or, may be used for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0052] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0053] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0054] Please refer to Figure 2 , Figure 2The schematic diagram of the exploded structure of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures.

[0055] In some embodiments, the box body 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 jointly define a storage space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, the first portion 11 covers the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define a storage space; the first portion 11 and the second portion 12 may also be hollow structures with one side open, and the open side of the first portion 11 covers the open side of the second portion 12. Of course, the box body 10 formed by the first portion 11 and the second portion 12 may be in various shapes, such as a cylinder, a cuboid, etc.

[0056] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures. For example, the battery device 100 may also include a converging component (such as Figure 5 The first busbar 40 and the second busbar 50 shown in FIG. 1 are used to realize electrical connection between multiple battery cells 20.

[0057] Each battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0058] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery device. Figure 3 The battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components.

[0059] The housing 21 includes an end cover 211 and a shell 212 .

[0060] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as poles 23 can be provided on the end cap 211. The pole 23 can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. In order to reduce the risk of short circuit between the pole 23 and the end cap 211, an insulating member 24 can be provided between the pole 23 and the end cap 211. Exemplarily, the insulating member 24 can be plastic, rubber, etc.

[0061] In some embodiments, a pressure relief mechanism for releasing the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value may be provided on the end cap 211. The material of the end cap 211 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

[0062] In some embodiments, an insulating component may be provided inside the end cap 211, and the insulating component may be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. For example, the insulating component may be plastic, rubber, or the like.

[0063] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when the interior of the shell 212 needs to be encapsulated, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0064] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 212. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0065] According to some embodiments of the present application, referring to Figures 4 to 6 , Figure 4 is a schematic diagram of the structure of a battery cell according to some embodiments of the present application, Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle. Figure 6 Schematic diagram of the structure of a heat-conducting member in a battery cell according to some embodiments of the present application.

[0066] The present application provides a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 22, a pole 23, and a heat conductor 25, wherein the electrode assembly 22 is disposed in the housing 21, the pole 23 is disposed in the housing 21 and is electrically connected to the electrode assembly 22, and the heat conductor 25 is disposed outside the housing 21.

[0067] The heat conducting member 25 connects the pole 23 and the housing 21, and is used to transfer the heat of the pole 23 to the housing 21. The heat conducting member 25 has a heat conducting cavity 2511, a capillary structure is arranged in the heat conducting cavity 2511, and the heat conducting cavity 2511 is filled with a phase change medium.

[0068] refer to Figure 6 The heat conducting member 25 may be a heat pipe, including a tube shell 251 and a liquid wick 252. The tube shell 251 is provided with a heat conducting cavity 2511, and the heat conducting cavity 2511 is filled with a phase change medium. The liquid wick 252 is provided in the tube shell 251 and in the heat conducting cavity 2511, and the liquid wick 252 is provided with a capillary structure.

[0069] The main function of the capillary structure is to transfer liquid through capillary action. Metal capillary structure or ceramic capillary structure can be selected. When the metal capillary structure is selected, it is usually made of metal wire sintered at high temperature and then laser cut, and then oxidized and corroded with chemical reagents to obtain better capillary ability and hydrophilicity. When the ceramic capillary structure is selected, it is generally made of quartz and clay particles calcined.

[0070] The phase change medium can be alcohol or refrigerant.

[0071] The end of the heat conductor 25 connected to the pole 23 can be set as an evaporation section, and the end of the heat conductor 25 connected to the housing 21 can be set as a condensation section, wherein the evaporation section is the part where the phase change medium is heated and vaporized, and the condensation section is the part where the vaporized medium condenses and releases heat. When the evaporation section is heated, the liquid medium absorbs heat and evaporates into a gaseous state, and the vaporized medium flows to the condensation section under the action of the pressure difference. In the condensation section, the vaporized medium releases latent heat and condenses into a liquid state, and the liquid medium flows back to the evaporation section through capillary action. Efficient heat transfer is achieved through continuous circulation between the evaporation section and the condensation section.

[0072] In the technical solution of the embodiment of the present application, a heat conductor 25 is connected between the pole 23 and the outer shell 21, and the phase change medium in the heat conduction cavity 2511 flows between the capillary structures to transfer high temperature to low temperature, so that the heat of the pole 23 can be transferred to the outer shell 21 through the heat conductor 25, thereby improving the cooling effect on the pole 23 and further improving the reliability of the battery.

[0073] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The heat conductor 25 includes a first connecting section 25a, a second connecting section 25b and a heat transfer section 25c. The heat transfer section 25c is connected between the first connecting section 25a and the second connecting section 25b. The first connecting section 25a is attached to the pole 23, and the second connecting section 25b is attached to the shell 21.

[0074] At this time, the first connecting section 25a is equivalent to the evaporation section of the heat conducting element, and the second connecting section 25b is equivalent to the condensation section of the heat conducting element.

[0075] The first connecting section 25a is attached to the pole 23 and the second connecting section 25b is attached to the shell 21 to connect the heat conducting member 25 between the pole 23 and the shell 21, so that the heat of the pole 23 can be transferred to the shell 21 through the heat conducting member 25, thereby improving the cooling effect on the pole 23.

[0076] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The pole 23 includes an end face 231 and a side face 232 , the end face 231 is used to connect to the busbar, the side face 232 intersects with the end face 231 , and the first connecting section 25 a is attached to the side face 232 .

[0077] The first connecting section 25 a is attached to the side surface 232 of the pole 23 to achieve connection between the first connecting section 25 a and the pole 23 , while avoiding interference with the connection between the end surface 231 of the pole 23 and the busbar.

[0078] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 The heat conducting member 25 is insulated and connected to the pole 23 .

[0079] The “insulated connection” can be achieved by spraying an insulating coating on the outer surface of the heat conductor 25. Alternatively, an insulating heat conductor can be provided between the heat conductor 25 and the pole 23, which can both insulate the two components and effectively transfer the heat of the pole 23 to the heat conductor 25.

[0080] By making the heat conducting member 25 and the pole 23 in an insulated connection, the occurrence of a short circuit phenomenon can be reduced while the heat conducting member 25 and the pole 23 are connected.

[0081] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 The battery cell 20 further includes an insulating member 24 , at least a portion of which is disposed between the pole 23 and the housing 21 .

[0082] The heat conducting member 25 is connected to the insulating member 24 .

[0083] Since at least part of the insulating member 24 is disposed between the pole 23 and the housing 21 , the heat of the pole 23 can be transferred to the insulating member 24 . Then, through the connection between the heat conductive member 25 and the insulating member 24 , the heat transferred to the insulating member 24 can be transferred to the heat conductive member 25 , and then transferred to the housing 21 , thereby cooling the pole 23 .

[0084] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 The housing 21 includes a first wall 21a and a second wall 21b, the pole 23 is arranged on the first wall 21a, the heat conductor 25 connects the pole 23 and the second wall 21b, and the heat conductor 25 is used to transfer the heat of the pole 23 to the second wall 21b.

[0085] Since the pole 23 is arranged on the first wall 21a, and the heat conductor 25 connects the pole 23 and the second wall 21b, the pole 23 can directly transfer part of the heat to the first wall 21a, while transferring the remaining heat to the second wall 21b through the heat conductor 25, thereby accelerating the heat dissipation of the pole 23.

[0086] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5The shell 21 includes a shell 212 and an end cover 211. The shell 212 has a receiving cavity and an opening connected to the receiving cavity. The electrode assembly 22 is arranged in the receiving cavity. The end cover 211 is connected to the shell 212 and covers the opening.

[0087] The end cover 211 is the first wall 21 a , and the housing 212 includes the second wall 21 b .

[0088] By setting the end cover 211 as the first wall 21a and making the shell 212 include the second wall 21b, when the pole 23 is set on the end cover 211, the heat of the pole 23 can be transferred to the shell 212 through the heat conductor 25, thereby improving the cooling effect on the pole 23.

[0089] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 The shell 212 includes a side wall 2121 and a bottom wall 2122 , one end of the side wall 2121 is connected to the bottom wall 2122 , the side wall 2121 and the bottom wall 2122 form the accommodating cavity, and the other end of the side wall 2121 forms the opening.

[0090] The side wall 2121 or the bottom wall 2122 is the second wall 21 b.

[0091] By setting the side wall 2121 or the bottom wall 2122 as the second wall 21 b , when the pole 23 is set on the end cover 211 , the heat of the pole 23 can be transferred to the side wall 2121 or the bottom wall 2122 through the heat conductor 25 , thereby improving the cooling effect on the pole 23 .

[0092] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 There are two poles 23, and the two poles 23 include a positive pole 23a and a negative pole 23b.

[0093] Two heat conducting members 25 are provided, one of which is connected between the positive electrode post 23 a and the shell 21 , and the other heat conducting member 25 is connected between the negative electrode post 23 b and the shell 21 . A heat conductor 25 is connected between each pole 23 and the housing 21 , so that each pole 23 can be transferred to the housing 21 through the corresponding heat conductor 25 , thereby achieving heat dissipation of each pole 23 .

[0094] According to some embodiments of the present application, the present application further provides a battery device 100, comprising a battery cell 20 according to any of the above solutions.

[0095] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 The battery device 100 also includes a thermal management component 30, the housing 21 includes a first wall 21a and a second wall 21b, the pole 23 is arranged on the first wall 21a, the second wall 21b is thermally connected to the thermal management component 30, and the heat conductor 25 connects the pole 23 and the second wall 21b.

[0096] The thermal management component 30 may be a water cooling plate.

[0097] “The heat conducting member 25 is thermally connected to the thermal management component 30 ” means that while the heat conducting member 25 is connected to the thermal management component 30 , heat can be transferred between the two.

[0098] Since the pole 23 is disposed on the first wall 21a, and the heat conducting member 25 connects the pole 23 and the second wall 21b, the pole 23 can directly transfer part of the heat to the first wall 21a, while the remaining heat can be transferred to the second wall 21b through the heat conducting member 25. At this time, the second wall 21b can be cooled by the heat management component 30 that is heat-conductively connected to the second wall 21b, thereby accelerating the heat dissipation of the pole 23.

[0099] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 The second wall 21 b is disposed adjacent to the first wall 21 a , and the second wall 21 b is the wall with the largest outer surface area among all the walls of the outer shell 21 .

[0100] By arranging the second wall 21b adjacent to the first wall 21a, the length of the heat conductor 25 can be shortened. At the same time, by using the wall with the largest outer surface area among the walls of the housing 21 as the second wall 21b, the heat dissipation area of ​​the second wall 21b can be increased, thereby improving the cooling effect on the pole 23.

[0101] According to some embodiments of the present application, optionally, the second wall 21 b may be arranged opposite to the first wall 21 a along the first direction.

[0102] The first direction may be a height direction of the battery cell 20 , that is, a thickness direction of the battery device 100 .

[0103] By arranging the second wall 21 b opposite to the first wall 21 a , the heat of the pole 23 can be transferred to the wall of the housing 21 away from the pole 23 , thereby achieving heat dissipation of the pole 23 .

[0104] According to some embodiments of the present application, optionally, please continue to refer to Figure 2 A plurality of battery cells 20 are provided, and the plurality of battery cells 20 are arranged along a second direction, and the second direction is perpendicular to the first direction.

[0105] The second direction may be a length direction or a width direction of the battery device 100 .

[0106] The battery device 100 further includes a heat insulating pad, which is disposed between two adjacent battery cells 20 . The heat insulating pad is provided with an escape groove, and a portion of the heat conducting member 25 is accommodated in the escape groove.

[0107] When a plurality of battery cells 20 are arranged along the second direction and the second wall 21b is arranged opposite to the first wall 21a, an avoidance groove is provided on the thermal insulation pad between two adjacent battery cells 20 to provide an avoidance space for the installation of the heat conductor 25, so that the heat conductor 25 can be connected to the opposite sides of the outer shell 21 to realize heat transfer between the pole 23 and the second wall 21b.

[0108] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0109] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0110] According to some embodiments of the present application, see Figures 2 to 5 The present application provides a battery device 100 , wherein a box 10 includes a plurality of battery cells 20 , and the plurality of battery cells 20 are arranged in a plurality of rows and columns.

[0111] The battery cell 20 includes a shell 21, an electrode assembly 22, a pole 23, an insulating member 24 and a heat conductor 25. The electrode assembly 22 is arranged in the shell 21, the pole 23 is arranged in the shell 21 and is electrically connected to the electrode assembly 22, the insulating member 24 is insulated and connected between the pole 23 and the shell 21, and the heat conductor 25 is arranged outside the shell 21.

[0112] The heat conducting member 25 connects the side surface 232 of the pole 23 and the second wall 21 b of the housing 21 . The heat conducting member 25 is used to transfer the heat of the pole 23 to the second wall 21 b of the housing 21 .

[0113] The second wall 21 b of the housing 21 is a side wall 2121 of the shell 212 , and is also the wall with the largest outer surface area among all the walls of the housing 21 .

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; An electrode assembly is disposed in the housing; A pole, disposed on the housing, the pole being electrically connected to the electrode assembly; as well as, A heat conducting member, disposed outside the housing; Wherein, the heat conducting member connects the pole and the shell, and the heat conducting member is used to transfer the heat of the pole to the shell; The heat conducting member has a heat conducting cavity, a capillary structure is arranged in the heat conducting cavity, and the heat conducting cavity is filled with a phase change medium.

2. The battery cell according to claim 1, characterized in that: The heat conducting member comprises a first connecting section, a second connecting section and a heat transfer section, the heat transfer section is connected between the first connecting section and the second connecting section, the first connecting section is attached to the pole, and the second connecting section is attached to the shell.

3. The battery cell according to claim 2, characterized in that: The pole comprises an end face and a side face, the end face is used to connect the busbar, the side face intersects with the end face, and the first connecting section is attached to the side face.

4. The battery cell according to claim 1, characterized in that: The heat conducting member is insulated and connected to the pole.

5. The battery cell according to claim 4, characterized in that: The battery cell further includes an insulating member, at least a portion of which is disposed between the pole and the housing; The heat conducting member is connected to the insulating member.

6. The battery cell according to claim 1, characterized in that: The housing comprises a first wall and a second wall, the pole is arranged on the first wall, the heat conductor connects the pole and the second wall, and the heat conductor is used to transfer the heat of the pole to the second wall.

7. The battery cell according to claim 6, characterized in that: The housing comprises a shell and an end cover, the shell has a receiving cavity and an opening communicating with the receiving cavity, the electrode assembly is arranged in the receiving cavity, and the end cover is connected to the shell and covers the opening; The end cover is the first wall, and the shell includes the second wall.

8. The battery cell according to claim 7, characterized in that: The shell comprises a side wall and a bottom wall, one end of the side wall is connected to the bottom wall, the side wall and the bottom wall form the accommodating cavity, and the other end of the side wall forms the opening; The side wall or the bottom wall is the second wall.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The heat conducting member is a heat pipe.

10. The battery cell according to any one of claims 1 to 8, characterized in that: The poles are provided with two, and the two poles include a positive pole and a negative pole; Two heat conducting members are provided, one of which is connected between the positive electrode post and the shell, and the other is connected between the negative electrode post and the shell.

11. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. The battery device according to claim 11, characterized in that: The battery device further includes a heat management component, the housing includes a first wall and a second wall, the pole is disposed on the first wall, the second wall is thermally connected to the heat management component, and the heat conductor connects the pole and the second wall.

13. The battery device according to claim 12, characterized in that: The second wall is disposed adjacent to the first wall, and the second wall is a wall having the largest outer surface area among all the wall portions of the housing.

14. The battery device according to claim 12, characterized in that: The second wall is arranged opposite to the first wall along a first direction.

15. The battery device according to claim 14, characterized in that: The battery cells are provided in plurality, and the plurality of battery cells are arranged along a second direction, and the second direction is perpendicular to the first direction; The battery device further comprises a heat insulating pad, which is arranged between two adjacent battery cells, and the heat insulating pad is provided with an escape groove, in which the heat conducting member is partially accommodated.

16. An electrical equipment, characterized in that: The method comprises a battery cell as claimed in any one of claims 1 to 10, or a battery device as claimed in any one of claims 11 to 15.

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