Battery monomer, battery device and electric equipment

Abstract

The invention discloses a single battery, a battery device and electric equipment, and the single battery comprises a shell which forms an accommodating space, the shell is provided with a large side surface and a small side surface, and the surface area of the small side surface is smaller than that of the large side surface; the electrode assembly is arranged in the accommodating space; and the heat conduction piece is attached to the outer surface of the small side face of the shell, the heat conduction piece comprises a flexible heat conduction piece and a rigid heat conduction piece, and the flexible heat conduction piece is connected with the rigid heat conduction piece. By arranging the heat conduction part on the small side face of the shell, heat generated by elements in the shell can be quickly conducted out through the small side face, so that thermal runaway of the battery monomers is prevented, in addition, through cooperation of the flexible heat conduction part and the rigid heat conduction part, the heat conduction part can work at different temperatures, and the reliability is high.

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] Electricity is a very environmentally friendly energy source, which is used in various fields such as energy storage, transportation, daily necessities, scientific research, etc. Especially in the automotive industry, with the rise of new energy vehicles, batteries are widely used in the automotive industry. Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, in addition to improving the energy density of batteries, the reliability of batteries is also an issue that cannot be ignored. Therefore, how to improve the reliability of batteries is a technical problem that needs to be solved in battery technology. Summary of the invention

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device. A heat conducting member is provided on the small side surface of the shell in the battery cell, which can solve the technical problem of reliability of the battery device.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a battery cell, which includes: a shell, forming a accommodating space, the shell having a large side and a small side, and the surface area of ​​the small side is smaller than the surface area of ​​the large side; an electrode assembly, arranged in the accommodating space; a heat conductor, the heat conductor is arranged against the outer surface of the small side of the shell, the heat conductor includes a flexible heat conductor and a rigid heat conductor, and the flexible heat conductor is connected to the rigid heat conductor.

[0006] By arranging a heat conductor on the small side of the shell, the heat generated by the internal components of the shell can be quickly discharged through the small side, thereby preventing thermal runaway of the battery cell. In addition, through the cooperation of the flexible heat conductor and the rigid heat conductor, the heat conductor can work at different temperatures and has high reliability.

[0007] In a possible implementation, a receiving space is formed in the flexible heat conductive member, the rigid heat conductive member is disposed in the receiving space, and the flexible heat conductive member is connected to the small side surface of the housing.

[0008] In this way, the flexible heat-conducting member is arranged outside, which can produce a certain buffer when the shell or the rigid heat-conducting member is deformed by heat, thereby enhancing the stability of the battery cell.

[0009] In a possible implementation, the flexible heat conductive component completely wraps the rigid heat conductive component.

[0010] This method can further prevent the rigid heat-conducting member from rubbing or friction with the housing or other components, thereby reducing the possibility of damage to the battery cell.

[0011] In a possible implementation, a first opening is formed on the flexible heat-conducting member, and the rigid heat-conducting member is arranged to avoid the first opening, and the first opening exposes the small side surface of the housing.

[0012] The first opening is provided for two purposes. One is to expose the small side surface of the housing so as to connect with other components. The other is that when the heat is relatively high and the housing and the rigid heat-conducting member expand, the flexible heat-conducting member has more room for movement.

[0013] In a possible implementation, a second opening is formed on the flexible heat-conducting member, and the rigid heat-conducting member is exposed through the second opening.

[0014] This setting method can directly expose the rigid heat-conducting member, which can improve the heat dissipation performance of the rigid heat-conducting member, thereby improving the heat dissipation performance of the heat-conducting member.

[0015] In a possible implementation, a third opening is formed on the rigid heat-conducting member, and the third opening is correspondingly arranged with the second opening to expose the small side surface of the housing.

[0016] This setting method can not only expose the small side surface of the housing to facilitate connection, but also expose part of the rigid heat-conducting member to improve the heat dissipation performance of the heat-conducting member.

[0017] In a possible implementation, the volume ratio of the rigid heat-conducting member to the flexible heat-conducting member is 1:1 to 1:10.

[0018] This setting method can ensure that the proportion of the flexible heat-conducting member is large enough to achieve a buffering effect.

[0019] In a possible implementation, the volume ratio of the rigid heat-conducting member to the flexible heat-conducting member is 1:2 to 1:5.

[0020] This setting method can ensure that while the flexible heat-conducting member achieves a buffering effect, a good heat conduction effect is further achieved through the rigid heat-conducting member.

[0021] In a possible implementation, the thickness of the heat-conducting member is 0.1 - 5 mm; in the height direction of the housing, the ratio of the size of the heat-conducting member to the size of the housing is 0.5:1 to 1:1; in the thickness direction of the housing, the ratio of the size of the heat-conducting member to the size of the housing is 0.5:1 to 1:1.

[0022] This setting method can ensure that the size of the heat-conducting member is large enough to achieve heat conduction on the small side surface of the housing.

[0023] In a possible implementation, the thickness of the heat-conducting member is 1-3 mm; in the height direction of the housing, the ratio of the size of the heat-conducting member to the size of the housing is 0.8:1 to 1:1; in the thickness direction of the housing, the ratio of the size of the heat-conducting member to the size of the housing is 0.8:1 to 1:1.

[0024] This setting method can make the heat conduction effect of the heat-conducting member better.

[0025] In a possible implementation, the flexible heat-conducting member is an elastic heat-conducting member.

[0026] The elastic heat-conducting member has a better buffering effect.

[0027] In a possible implementation, the flexible heat-conducting member includes silica gel, aerogel, polyamide or resin.

[0028] The above types have lower costs and have the characteristics of both heat conduction and elasticity.

[0029] In a possible implementation, the rigid heat-conducting member includes one or more of metal powders, metal oxides, metal nitrides or inorganic non-metallic materials.

[0030] Metal powders, metal oxides, metal nitrides and inorganic non-metallic materials are all rigid materials and have good heat conductivity.

[0031] In a possible implementation, the metal powders include copper powder, aluminum powder, iron powder, tin powder or nickel powder; the metal oxides include aluminum oxide, bismuth oxide, beryllium oxide, magnesium oxide or zinc oxide; the metal nitrides include aluminum nitride, boron nitride or silicon nitride; the inorganic non-metallic materials include graphite, silicon carbide, carbon fiber, carbon nanotube, graphene or beryllium carbide; The above materials have lower costs, are more common, and also have good heat conductivity.

[0032] In a possible implementation, the heat-conducting member is adhesively connected to the small side surface of the housing.

[0033] The heat-conducting member is connected to the small side surface of the housing by adhesion, which can make the connection between the heat-conducting member and the housing closer and not easily fall off.

[0034] To solve the above technical problems, another technical solution adopted by this application is to provide a battery device, which includes the above battery cell.

[0035] By providing a heat-conducting member on the battery cell of the battery device, the heat generated by the internal components of the housing can be quickly exported through the small side surface, thereby preventing the battery cell from thermal runaway. In addition, through the cooperation of the flexible heat-conducting member and the rigid heat-conducting member, the heat-conducting member can work at different temperatures, and the reliability is strong.

[0036] To solve the above technical problems, another technical solution adopted in this application is to provide an electrical device, which includes the above battery device.

[0037] By providing a heat conducting member on the battery cell of the battery device of the electrical device, the heat generated by the internal components of the housing can be quickly dissipated through the small side surface, thereby preventing thermal runaway of the battery cell. In addition, through the cooperation of the flexible heat conducting member and the rigid heat conducting member, the heat conducting member can work at different temperatures, with strong reliability.

[0038] The above description is only an overview of the technical solution of this application. In order to be able to more clearly understand the technical means of this application, it can be implemented according to the content of the specification. And in order to make the above content, other purposes, features and advantages of this application more obvious and understandable, the following specifically gives the specific implementation manners of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 Schematic structural diagram of a vehicle according to one or more embodiments of this application; Figure 2 Schematic structural diagram of a battery device according to one or more embodiments of this application; Figure 3 Schematic structural diagram of a battery cell according to one or more embodiments of this application; Figure 4 Schematic side view structural diagram of a battery cell according to one or more embodiments of this application; Figure 5 For Figure 4 Schematic cross-sectional structural diagram of the heat conducting member along A-A' according to one or more embodiments in Figure 6 For Figure 4 Schematic cross-sectional structural diagram of the heat conducting member along A-A' according to another or more embodiments in Figure 7 Schematic side view structural diagram of a battery cell according to another or more embodiments of this application; Figure 8 Schematic side view structural diagram of a battery cell according to yet another or more embodiments of this application; Figure 9Schematic side view structure of a battery cell according to one or more embodiments of the present application.

[0041] Wherein, 1000 - vehicle; 100 - battery device; 200 - controller; 300 - motor; 10 - box; 11 - first part; 12 - second part; 20 - battery cell; 21 - housing; 22 - connecting member; 23 - electrode assembly; 23a - tab; 24 - insulating member; 211 - end cap assembly; 211a - electrode terminal; 212 - outer shell; 215 - small side; 25 - heat conducting member; 251 - flexible heat conducting member; 252 - rigid heat conducting member; 511 - first opening; 512 - second opening; 521 - third opening. Detailed implementation manners

[0042] Embodiments of the technical solutions of the present application will be described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise specifically defined, the term "plurality" means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0045] Referring to "embodiments" herein means that a specific feature, structure or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0049] The battery cells disclosed in the embodiments of the present application can be used but are not limited to power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cells and batteries disclosed in the present application.

[0050] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0051] Among them, the battery cell includes a shell and an electrode assembly. The electrode assembly is arranged in the shell, and the heat of the electrode assembly can be discharged through the shell. On the large side of the shell of the battery cell, a heat-conducting or cooling component is generally arranged, so as to cool the large side of the shell of the battery elevator. However, after research, it is found that when the battery cell is heated or thermal runaway occurs, the temperature of its small side is higher than the temperature of its large side. However, the prior art does not provide a separate heat-conducting or heat-dissipating structure for the small side of the shell, so the reliability of the existing battery cell is insufficient. In addition, the heat-conducting device in the prior art is generally a simple cold plate or silica gel. The cold plate has a good heat dissipation effect, but when the battery cell is deformed due to overheating, it cannot be buffered, which will produce greater pressure on the battery cell; and the thermal conductivity of the silica gel material is not as good as that of metal materials such as cold plates.

[0052] Based on the above considerations, in order to solve the technical problem of insufficient reliability of battery cells in the prior art, the present application proposes a battery cell, a battery device and an electrical device, wherein the battery cell includes a shell. A shell, an electrode assembly and a heat conductor. The shell forms an accommodation space. The shell has a large side and a small side, and the surface area of ​​the small side is smaller than the surface area of ​​the large side. The electrode assembly is arranged in the accommodation space. The heat conductor is arranged close to the small side of the shell. The heat conductor includes a flexible heat conductor and a rigid heat conductor, and the flexible heat conductor is connected to the rigid heat conductor. By arranging a heat conductor at the small side of the subject, the heat removed from the small side of the shell can be conducted out, accelerating the heat dissipation of the battery cell, thereby enhancing the reliability of the battery cell. The combination of the rigid heat conductor and the flexible heat conductor takes into account the effects of buffering the expansion of the shell and good heat dissipation.

[0053] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0054] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the structure of a vehicle according to one or more embodiments of the present application.

[0055] 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 to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0056] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0057] Please refer to Figure 2 With Figure 3 , Figure 2 is a schematic structural diagram of a battery device according to one or more embodiments of the present application. The battery device 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0058] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery device 100 can also be that multiple battery cells 20 are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20. Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0059] Please refer to Figure 3 , Figure 3 is a schematic structural diagram of a battery cell according to one or more embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery device 100. As Figure 3As shown, the battery cell 20 includes a housing 21, an electrode assembly 23, and other functional components. The housing 21 includes an end cap assembly 211 and an outer shell 212. The outer shell 212 has an opening, and the end cap assembly 211 closes the opening. The end cap assembly 211 refers to a component that covers the opening of the outer shell 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 211 can be adapted to the shape of the outer shell 212 to cooperate with the outer shell 212. Optionally, the end cap assembly 211 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap assembly 211 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211a can be provided on the end cap assembly 211. The electrode terminals 211a can be used to electrically connect to the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap assembly 211. The material of the end cap assembly 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member 24 can also be provided on the inner side of the end cap assembly 211. The insulating member 24 can be used to isolate the electrical connection components in the outer shell 212 from the end cap assembly 211 to reduce the risk of short circuit. Exemplarily, the insulating member 24 can be plastic, rubber, etc. The outer shell 212 is a component for cooperating with the end cap assembly 211 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The outer shell 212 and the end cap assembly 211 can be independent components. An opening can be provided on the outer shell 212, and the end cap assembly 211 is covered on the opening to form the internal environment of the battery cell 20.

[0060] Without limitation, the end cap assembly 211 and the outer shell 212 can also be integrated. Specifically, the end cap assembly 211 and the outer shell 212 can first form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the inside of the outer shell 212, the end cap assembly 211 is then covered on the outer shell 212. The outer shell 212 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer shell 212 can be determined according to the specific shape and size of the electrode assembly 23. The material of the outer shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. An electrode lead-out portion (not shown in the figure) can be provided on the outer shell 212. The electrode lead-out portion is used to electrically connect to the tab 23a for outputting or inputting the electrical energy of the battery cell 20.

[0061] The electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 23 may be contained within the outer casing 212. The electrode assembly 23 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 23, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs 23a. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 23a are connected to the electrode terminals 211a through the connecting member 22 to form a current loop.

[0062] To improve the reliability of the battery device, the present application provides a battery cell, a battery device, and an electrical device. Please refer to Figure 4 and Figure 5 , Figure 4 FIG. [X] is a schematic side view of a battery cell according to one or more embodiments of the present application; Figure 5 FIG. [Y] is Figure 4 a schematic cross-sectional view of the heat conducting member along A-A' in one or more embodiments of FIG. [Y]. The battery cell 20 includes: a housing 21, an electrode assembly 23, and a heat conducting member 25. The housing 21 forms an accommodation space. The housing 21 has a large side surface and a small side surface 215, and the surface area of the small side surface 215 is smaller than the surface area of the large side surface. The electrode assembly 23 is disposed in the accommodation space. The heat conducting member 25 is disposed in contact with the outer surface of the small side surface 215 of the housing 21. The heat conducting member 25 includes a flexible heat conducting member 251 and a rigid heat conducting member 252, and the flexible heat conducting member 251 is connected to the rigid heat conducting member 252.

[0063] The housing 21 generally has four sides, with two opposite sides having a larger surface area and the other two opposite sides having a smaller surface area. Among them, the two sides with a larger surface area can be called large sides, and the two sides with a smaller surface area can be called small sides 215. The electrode assembly 23 is the main component where electrochemical reactions occur, and it is also the component in the battery cell 20 that is most likely to generate heat and experience thermal runaway. The temperature at the small side 215 of the housing 21 of the battery cell 20 is usually higher than that at the large side. The heat conducting member 25 is a component used for heat conduction. Therefore, setting the heat conducting member 25 at the small side 215 of the housing 21 can more effectively conduct out the heat generated by the electrode assembly 23 inside the housing 21. The flexible heat conducting member 251 is a heat conducting member 25 with flexibility and can deform under force to provide buffering. The rigid heat conducting member 252 is a heat conducting member 25 made of a hard material, and generally, some metal materials or non-metallic materials with good heat conduction are used for the rigid heat conducting member 252. The heat conduction effect of the rigid heat conducting member 252 is generally better than that of the flexible heat conducting member 251. The flexible heat conducting member 251 and the rigid heat conducting member 252 can be connected in a laminated manner, an adjacent manner, a wrapping manner, or a mixed manner. Since the flexible material can deform, the connection method between the rigid heat conducting member 252 and the flexible heat conducting member 251 can be diverse. For example, in the mixed connection method, the rigid heat conducting member 252 can be made into small structures such as powders or granules, and then poured into the softened flexible heat conducting member 251 and stirred. After the flexible heat conducting member 251 solidifies, the rigid heat conducting member 252 will be doped in the flexible heat conducting member 251, thus achieving the mixed connection.

[0064] By setting the heat conducting member 25 at the small side 215 of the housing 21, the heat generated by the internal components of the housing 21 can be quickly conducted out through the small side 215, thereby preventing the battery cell 20 from experiencing thermal runaway. In addition, through the cooperation of the flexible heat conducting member 251 and the rigid heat conducting member 252, the heat conducting member 25 can work at different temperatures, can not only achieve the buffering function but also have high heat conduction performance and strong reliability.

[0065] In a possible implementation manner, a receiving space is formed in the flexible heat conducting member 251, the rigid heat conducting member 252 is arranged in the receiving space, and the flexible heat conducting member 251 is connected to the small side 215 of the housing 21.

[0066] The flexible heat conducting member 251 can be a hollow structure, thus forming a receiving space, and the rigid heat conducting member 252 is arranged in the receiving space. Or, please further refer to Figure 6 , Figure 6 For Figure 4Schematic cross-sectional structure diagram of the heat-conducting member according to another one or more embodiments along A-A'. The flexible heat-conducting member 251 can be a sandwich structure, divided into two parts, with a formed accommodation space in the middle, and the rigid heat-conducting member 252 is clamped therein. The flexible heat-conducting member 251 and the rigid heat-conducting member 252 can be connected by pasting. Connecting the flexible heat-conducting member 251 to the small side surface 215 of the housing 21 can enable the flexible heat-conducting member 251 to buffer between the housing 21 and the rigid heat-conducting member 252, preventing contact between the housing 21 and the rigid heat-conducting member 252, thereby causing wear of the housing 21.

[0067] In this way, by disposing the flexible heat-conducting member 251 outside, a certain buffer can be generated when the housing 21 or the rigid heat-conducting member 252 is deformed by heat, enhancing the stability of the battery cell 20.

[0068] In a possible embodiment, the flexible heat-conducting member 251 completely wraps the rigid heat-conducting member 252.

[0069] The flexible heat-conducting member 251 completely wraps the rigid heat-conducting member 252, that is, the flexible heat-conducting member 251 surrounds the rigid heat-conducting member 252. The accommodation space re-formed by the flexible heat-conducting member 251 is a closed space, and the rigid heat-conducting member 252 is disposed in this space. This structure can be achieved by disposing the flexible heat-conducting member 251 in all directions of the rigid heat-conducting member 252, or by spraying a coating of the flexible heat-conducting member 251, then spraying a coating of the rigid heat-conducting member 252 on the coating of the flexible heat-conducting member 251, and finally spraying a coating of the flexible heat-conducting member 251 to completely enclose a part of the rigid heat-conducting member 252. Or, the flexible heat-conducting member 251 completely wraps the rigid heat-conducting member 252 through a mold.

[0070] This way can further prevent the rigid heat-conducting member 252 from rubbing or chafing against the housing 21 or other components, thereby reducing the possibility of damage to the battery cell 20.

[0071] Please refer to Figure 7 , Figure 7 Schematic side view structure diagram of the battery cell according to another one or more embodiments of the present application. In a possible embodiment, a first opening 511 is formed on the flexible heat-conducting member 251, the rigid heat-conducting member 252 is disposed avoiding the first opening 511, and the first opening 511 exposes the small side surface 215 of the housing 21.

[0072] The first opening 511 can be disposed in the middle of the flexible heat-conducting member 251 or at other positions of the flexible heat-conducting member 251, which is not limited herein. The first opening 511 can be one or more. The opening direction of the first opening 511 is the thickness direction of the flexible heat-conducting member 251, so as to expose the small side surface 215 of the housing 21. The shape of the first opening 511 can be circular, oval, quasi-circular, fan-shaped, and polygonal, etc., and can be set according to actual needs. The polygon can be a rectangle, a parallelogram, a triangle, a trapezoid, or a pentagon, a hexagon, etc. The first opening 511 penetrates the heat-conducting member 25 in the thickness direction of the heat-conducting member 25. The rigid heat-conducting member 252 is disposed avoiding the first opening 511, that is, the rigid heat-conducting member 252 is not provided at the first opening 511. The rigid heat-conducting member 252 can be completely wrapped by the flexible heat-conducting member 251 or can be exposed outside the flexible heat-conducting member 251 at other positions.

[0073] One purpose of setting the first opening 511 is to expose the small side surface 215 of the housing 21 so as to connect with other components. The other purpose is that when the housing 21 and the rigid heat-conducting member 252 expand at a higher temperature, the flexible heat-conducting member 251 has more space for movement.

[0074] Please refer to Figure 8 , Figure 8 which is a schematic side view structure diagram of a battery cell according to another one or more embodiments of the present application. In a possible embodiment, a second opening 512 is formed on the flexible heat-conducting member 251, and the rigid heat-conducting member 252 is exposed through the second opening 512.

[0075] The second opening 512 can be disposed in the middle of the flexible heat-conducting member 251 or at other positions of the flexible heat-conducting member 251, which is not limited herein. The second opening 512 can be one or more. The opening direction of the second opening 512 is the thickness direction of the flexible heat-conducting member 251, so as to expose the small side surface 215 of the housing 21. The shape of the second opening 512 can be circular, oval, quasi-circular, fan-shaped, and polygonal, etc., and can be set according to actual needs. The polygon can be a rectangle, a parallelogram, a triangle, a trapezoid, or a pentagon, a hexagon, etc. The rigid heat-conducting member 252 is provided at the second opening 512, so that the rigid heat-conducting member 252 can be exposed through the second opening 512, while the housing 21 is not exposed through the second opening 512.

[0076] This setting method can directly expose the rigid heat-conducting member 252, which can improve the heat dissipation performance of the rigid heat-conducting member 252, thereby improving the heat dissipation performance of the heat-conducting member 25.

[0077] Please refer to Figure 9 , Figure 9Schematic side view structure of a battery cell according to one or more embodiments of the present application. In a possible embodiment, a third opening 521 is formed on the rigid heat-conducting member 252, and the third opening 521 is correspondingly arranged with the second opening 512 to expose the small side surface 215 of the housing 21.

[0078] The third opening 521 can be arranged in the middle of the rigid heat-conducting member 252, or can be arranged at other positions of the rigid heat-conducting member 252, as long as it is correspondingly arranged with the second opening 512, and it is not limited here. The third opening 521 can have one or more. The opening direction of the third opening 521 is the thickness direction of the flexible heat-conducting member 251, so as to expose the small side surface 215 of the housing 21. The shape of the third opening 521 can be circular, oval, quasi-circular, fan-shaped, polygonal, etc., and can be set according to actual needs. The polygon can be a rectangle, parallelogram, triangle, trapezoid, pentagon, hexagon, etc. The opening area of the third opening 521 can be smaller than the opening area of the second opening 512, or the opening area of the third opening 521 is equal to the opening area of the second opening 512.

[0079] This setting method can not only expose the small side surface 215 of the housing 21 to facilitate connection, but also expose part of the rigid heat-conducting member 252 to improve the heat dissipation performance of the heat-conducting member 25.

[0080] In a possible embodiment, the volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 is 1:1 to 1:10.

[0081] The volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 can be any value among 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.3, 1:3.6, 1:3.8, 1:4, 1:4.7, 1:5, 1:5.2, 1:6, 1:6.5, 1:7, 1:8, 1:9, 1:10, or any value within any two of the above numerical ranges.

[0082] This setting method can ensure that the proportion of the flexible heat-conducting member 251 is large enough to achieve a buffering effect.

[0083] In a possible embodiment, the volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 is 1:2 to 1:5.

[0084] The volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 can be any value among 1:2, 1:2.1, 1:2.3, 1:2.5, 1:3, 1:3.3, 1:3.6, 1:3.8, 1:4, 1:4.3, 1:4.7, 1:5, or any value within any two of the above numerical ranges.

[0085] This setting method can ensure that the flexible heat-conducting member 251 realizes a buffering effect, and at the same time, further realizes a good heat conduction effect through the rigid heat-conducting member 252.

[0086] In a possible implementation manner, the thickness of the heat-conducting member 25 is 0.1 - 5 mm; in the height direction of the housing 21, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 is 0.5:1 to 1:1; in the thickness direction of the housing 21, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 is 0.5:1 to 1:1.

[0087] The thickness of the heat-conducting member 25 can be any value among 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 4.5 mm, 5 mm, or any value within any one of the above two value ranges. In the height direction of the housing 21, that is, the length direction of the heat-conducting member 25, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 can be any value among 0.5:1, 0.5:1, 0.6:1, 0.7:1, 0.75:1, 0.8:1, 0.85:1, 0.9:1, 1:1, or any value within any one of the above two value ranges. In the thickness direction of the housing 21, that is, the width direction of the heat-conducting member 25, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 can be any value among 0.5:1, 0.5:1, 0.6:1, 0.7:1, 0.75:1, 0.8:1, 0.85:1, 0.9:1, 1:1, or any value within any one of the above two value ranges.

[0088] This setting method can ensure that the size of the heat-conducting member 25 is sufficient to achieve heat conduction of the small side surface 215 of the housing 21.

[0089] In a possible implementation manner, the thickness of the heat-conducting member 25 is 1 - 3 mm; in the height direction of the housing 21, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 is 0.8:1 to 1:1; in the thickness direction of the housing 21, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 is 0.8:1 to 1:1.

[0090] The thickness of the heat-conducting member 25 can be any value among 1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.8 mm, 3 mm, or any value within any of the ranges of any two of the above. In the height direction of the housing 21, that is, in the length direction of the heat-conducting member 25, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 can be any value among 0.8:1, 0.85:1, 0.86:1, 0.87:1, 0.875:1, 0.9:1, 0.95:1, 0.99:1, 1:1, or any value within any of the ranges of any two of the above. In the thickness direction of the housing 21, that is, in the width direction of the heat-conducting member 25, the ratio of the size of the heat-conducting member 25 to the size of the housing 21 can be any value among 0.8:1, 0.85:1, 0.86:1, 0.87:1, 0.875:1, 0.9:1, 0.95:1, 0.99:1, 1:1, or any value within any of the ranges of any two of the above.

[0091] This setting method can make the heat conduction effect of the heat-conducting member 25 better.

[0092] In a possible implementation, the flexible heat-conducting member 251 is an elastic heat-conducting member 25.

[0093] The elastic heat-conducting member 25 is a heat-conducting member 25 with elasticity. The elastic heat-conducting member 25 will deform when stressed and return to its original state after the force disappears, so it has a good buffering effect and better stability.

[0094] The buffering effect of the elastic heat-conducting member 25 is better.

[0095] In a possible implementation, the flexible heat-conducting member 251 includes silica gel, aerogel, polyamide, or resin.

[0096] Silica gel, aerogel, polyamide, and resin all have good elasticity and flexibility, so they can be used to make the flexible heat-conducting member 251.

[0097] The above types have relatively low costs and have the characteristics of both heat conduction and elasticity.

[0098] In a possible implementation, the rigid heat-conducting member 252 includes one or more of metal powder, metal oxide, metal nitride, or inorganic non-metallic material.

[0099] The metal powder is a powdery metal material, which can be obtained by grinding the metal into powder. Metal oxides, metal nitrides, and inorganic non-metallic materials are all commonly used heat-conducting materials.

[0100] Metal powders, metal oxides, metal nitrides and inorganic non-metallic materials are all rigid materials and have good thermal conductivity.

[0101] In a possible implementation, the metal powder includes copper powder, aluminum powder, iron powder, tin powder or nickel powder; the metal oxide includes aluminum oxide, bismuth oxide, beryllium oxide, magnesium oxide or zinc oxide; the metal nitride includes aluminum nitride, boron nitride or silicon nitride; the inorganic non-metallic material includes graphite, silicon carbide, carbon fiber, carbon nanotube, graphene or beryllium carbide; Copper, aluminum, iron, tin and nickel all have good thermal conductivity, so their powders also have good thermal conductivity. And using powder can save more materials than directly using a whole piece of metal. Aluminum oxide, bismuth oxide, beryllium oxide, magnesium oxide or zinc oxide also have good thermal conductivity, so they can be used to make rigid thermal conductor 252. Similarly, aluminum nitride, boron nitride or silicon nitride also have good thermal conductivity. Although graphite, silicon carbide, carbon fiber, carbon nanotubes, graphene or beryllium carbide are not metals, they all have good thermal conductivity and can also be used as rigid thermal conductor 252.

[0102] The above materials are low in cost, relatively common, and have good thermal conductivity.

[0103] In a possible implementation, the heat conducting element 25 is adhesively connected to the small side surface 215 of the housing 21 .

[0104] The heat-conducting member 25 can be connected to the housing 21 by gluing, and the glue used for gluing can be a double-sided heat-conducting glue, that is, it can realize gluing connection and also conduct heat.

[0105] The heat conducting member 25 is connected to the small side surface 215 of the shell 21 by gluing, so that the connection between the heat conducting member 25 and the shell 21 can be made tighter and not easy to fall off.

[0106] In order to solve the above technical problem, another technical solution adopted by the present application is to provide a battery device, which includes the above-mentioned battery cell 20.

[0107] By arranging a heat conductive member 25 on the battery cell 20 of the battery device, the heat generated by the internal components of the shell 21 can be quickly discharged through the small side surface 215, thereby preventing the battery cell 20 from thermal runaway. In addition, through the cooperation of the flexible heat conductive member 251 and the rigid heat conductive member 252, the heat conductive member 25 can work at different temperatures and has high reliability.

[0108] In order to solve the above technical problem, another technical solution adopted by the present application is to provide an electrical device, which includes the above battery device.

[0109] By providing a heat conducting member 25 on the battery cell 20 of the battery device of the electrical equipment, the heat generated by the components inside the housing 21 can be quickly conducted out through the small side surface 215, thereby preventing the thermal runaway of the battery cell 20. In addition, through the cooperation of the flexible heat conducting member 251 and the rigid heat conducting member 252, the heat conducting member 25 can work at different temperatures, with strong reliability.

[0110] The above partial embodiments are experimentally demonstrated in the following ways: Thermal runaway test method: 1. Battery cell status: One layer of flexible busbar needs to be welded on the top cover and the terminal post, 100% SOC; Test cell temperature: 25 ± 3°C. Please ensure the initial temperature of the cell before the experiment.

[0111] Arrange temperature sensing wires; Voltage wire arrangement: V positive / V negative / V positive to the case / V negative to the case; Multi-channel acquisition frequency: ≤0.1S.

[0112] 2. Assembly fixture: Fixture force 3000N, the upper surface of the fixture is flush with the top cover of the cell; The bottom of the cell is suspended, and the suspension height ≥5mm. Assembly status: The two sides of the battery cell are the fixtures.

[0113] 3. Test process: Heating rate: 5°C / min; First step: Keep at 60°C for 5h; Second step: Heat up at 5°C / min, and keep for 30min every time it heats up 5°C until the cell fails or 24h.

[0114] 4. Stand still for 1h.

[0115] Example data:

[0116] Table 1 Referring to Table 1, through the above tests, it can be demonstrated that the heat conducting member of the present application has good heat conduction effect, and can effectively prevent the adjacent battery cells from thermal runaway when the temperature of the battery cell is relatively high, thereby improving the reliability of the battery cell, the battery device and the electrical equipment.

[0117] Finally, in a specific application scenario, to solve the technical problem of the reliability of the battery device, the present application provides a battery cell 20, which includes: a housing 21, an electrode assembly 23, and a heat conducting member 25. The housing 21 forms an accommodation space. The housing 21 has a large side surface and a small side surface 215, and the surface area of the small side surface 215 is smaller than that of the large side surface. The electrode assembly 23 is disposed in the accommodation space. The heat conducting member 25 is disposed against the outer surface of the small side surface 215 of the housing 21. The heat conducting member 25 includes a flexible heat conducting member 251 and a rigid heat conducting member 252, and the flexible heat conducting member 251 is connected to the rigid heat conducting member 252. An accommodation space is formed in the flexible heat conducting member 251, and the rigid heat conducting member 252 is disposed in the accommodation space, and the flexible heat conducting member 251 is connected to the small side surface 215 of the housing 21. The flexible heat conducting member 251 includes silica gel, aerogel, polyamide, or resin. The rigid heat conducting member 252 includes one or more of metal powder, metal oxide, metal nitride, or inorganic non-metallic material.

[0118] By disposing the heat conducting member 25 on the small side surface 215 of the housing 21, the heat generated by the internal components of the housing 21 can be quickly exported through the small side surface 215, thereby preventing the battery cell 20 from thermal runaway. In addition, through the cooperation of the flexible heat conducting member 251 and the rigid heat conducting member 252, the heat conducting member 25 can work at different temperatures, can achieve a buffering function, and has high heat conduction performance and strong reliability. In this way, by disposing the flexible heat conducting member 251 outside, a certain buffer can be generated when the housing 21 or the rigid heat conducting member 252 is deformed by heat, enhancing the stability of the battery cell 20. The above types have low costs and have the characteristics of both heat conduction and elasticity. Metal powder, metal oxide, metal nitride, and inorganic non-metallic materials are all rigid materials and have good heat conductivity.

[0119] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A shell, forming an accommodating space, wherein the shell has a large side surface and a small side surface, and the surface area of ​​the small side surface is smaller than the surface area of ​​the large side surface; An electrode assembly is disposed in the accommodating space; A heat conductive member is disposed close to the outer surface of the small side surface of the shell, and the heat conductive member comprises a flexible heat conductive member and a rigid heat conductive member, and the flexible heat conductive member is connected to the rigid heat conductive member.

2. The battery cell according to claim 1, characterized in that: An accommodating space is formed in the flexible heat-conducting member, the rigid heat-conducting member is arranged in the accommodating space, and the flexible heat-conducting member is connected to the small side surface of the shell.

3. The battery cell according to claim 2, characterized in that: The flexible heat conductive member completely wraps the rigid heat conductive member.

4. The battery cell according to claim 3, characterized in that: A first opening is formed on the flexible heat-conducting member, and the rigid heat-conducting member is arranged to avoid the first opening, and the first opening exposes a small side surface of the housing.

5. The battery cell according to claim 2, characterized in that: A second opening is formed on the flexible heat conductive member, and the rigid heat conductive member is exposed through the second opening.

6. The battery cell according to claim 5, characterized in that: A third opening is formed on the rigid heat-conducting member, and the third opening is arranged corresponding to the second opening to expose a small side surface of the shell.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The volume ratio of the rigid heat conductive component to the flexible heat conductive component is 1:1 to 1:

10.

8. The battery cell according to claim 7, characterized in that: The volume ratio of the rigid heat conductive component to the flexible heat conductive component is 1:2 to 1:

5.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the heat conductor is 0.1-5 mm; in the height direction of the shell, the ratio of the size of the heat conductor to the size of the shell is 0.5:1 to 1:1; in the thickness direction of the shell, the ratio of the size of the heat conductor to the size of the shell is 0.5:1 to 1:

1.

10. The battery cell according to claim 9, characterized in that: The thickness of the heat conductor is 1-3 mm; in the height direction of the shell, the ratio of the size of the heat conductor to the size of the shell is 0.8:1 to 1:1; in the thickness direction of the shell, the ratio of the size of the heat conductor to the size of the shell is 0.8:1 to 1:

1.

11. The battery cell according to any one of claims 1 to 6, characterized in that: The flexible heat-conducting member is an elastic heat-conducting member.

12. The battery cell according to any one of claims 1 to 6, characterized in that: The flexible heat-conducting member includes silica gel, aerogel, polyamide or resin.

13. The battery cell according to any one of claims 1 to 6, characterized in that: The rigid heat conductor includes one or more of metal powder, metal oxide, metal nitride or inorganic non-metallic material.

14. The battery cell according to claim 13, characterized in that: The metal powder includes copper powder, aluminum powder, iron powder, tin powder or nickel powder; the metal oxide includes aluminum oxide, bismuth oxide, beryllium oxide, magnesium oxide or zinc oxide; the metal nitride includes aluminum nitride, boron nitride or silicon nitride; the inorganic non-metallic material includes graphite, silicon carbide, carbon fiber, carbon nanotubes, graphene or beryllium carbide.

15. The battery cell according to any one of claims 1 to 6, characterized in that: The heat conducting element is adhesively connected to the small side surface of the housing.

16. A battery device, characterized in that: The battery device comprises the battery cell according to any one of claims 1-15.

17. An electrical equipment, characterized in that: The electrical equipment comprises the battery device as claimed in claim 16.

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