Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, a containing space is formed in the shell, the shell has a large side and a small side, the surface area of the small side is smaller than that of the large side; an electrode assembly is arranged in the containing space; a heat conduction member is arranged on the outer surface of the small side of the shell, the heat conduction member comprises a flexible heat conduction member and a rigid heat conduction member, and the flexible heat conduction member is connected with the rigid heat conduction member. The heat conduction member is arranged on the small side of the shell, so that the heat generated by the internal elements of the shell can be quickly conducted out through the small side, thereby preventing the thermal runaway of the battery monomer; in addition, the flexible heat conduction member and the rigid heat conduction member are matched, so that the heat conduction member can work at different temperatures, and the reliability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] Electric energy is a very environmentally friendly energy, which is applied in energy storage, transportation, daily necessities, scientific research and other fields. Especially in the automobile industry, with the rise of new energy vehicles, batteries are widely used in the automobile industry. Energy saving and emission reduction is 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 energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

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

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and an electric equipment, wherein the small side surface of the shell of the battery monomer is provided with a heat conducting member, which can solve the technical problem of the reliability of the battery device.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a battery monomer, which comprises: a shell forming a containing space, the shell having a large side surface and a small side surface, the surface area of the small side surface being smaller than that of the large side surface; an electrode assembly arranged in the containing space; a heat conducting member arranged in contact with the outer surface of the small side surface of the shell, the heat conducting member comprising a flexible heat conducting member and a rigid heat conducting member, the flexible heat conducting member being connected with the rigid heat conducting member.

[0006] By arranging the heat conducting member on the small side surface of the shell, the heat generated by the internal elements of the shell can be quickly conducted out through the small side surface, thereby preventing the thermal runaway of the battery monomer. 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 has high reliability.

[0007] In one possible implementation, the flexible heat conducting member forms an accommodating space, and the rigid heat conducting member is arranged in the accommodating space, and the flexible heat conducting member is connected with the small side surface of the shell.

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

[0009] In one possible implementation, the flexible heat conducting member completely wraps the rigid heat conducting member.

[0010] In this way, the rigid heat-conducting member can be further prevented from being scratched or rubbed against the shell or other components, thereby reducing the possibility of damage to the battery cell.

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

[0012] The first opening is arranged to expose the small side surface of the shell, so as to be connected to other components, and when the shell and the rigid heat-conducting member expand when the heat is high, the flexible heat-conducting member has more space to move.

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

[0014] In this way, the rigid heat-conducting member can be directly exposed, and the heat dissipation performance of the rigid heat-conducting member can be improved, thereby improving the heat dissipation performance of the heat-conducting member.

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

[0016] In this way, the small side surface of the shell can be exposed to facilitate connection, and part of the rigid heat-conducting member can be exposed 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] In this way, the proportion of the flexible heat-conducting member can be ensured to be large enough to achieve the 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] In this way, the flexible heat-conducting member can achieve the buffering effect, and the rigid heat-conducting member can further achieve good heat conduction effect.

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

[0022] In this way, the size of the heat-conducting member can be ensured to be large enough to achieve heat conduction to the small side surface of the shell.

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

[0024] This arrangement can make the heat-conducting 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 better buffering effect.

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

[0028] The above-mentioned materials are low in cost 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 powder, metal oxide, metal nitride, or inorganic non-metallic material.

[0030] The metal powder, the metal oxide, the metal nitride, and the inorganic non-metallic material are all rigid materials and have good heat conductivity.

[0031] 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; and the inorganic non-metallic material includes graphite, silicon carbide, carbon fiber, carbon nanotube, graphene, or beryllium carbide.

[0032] The above-mentioned materials are low in cost, common, and have good heat conductivity.

[0033] In a possible implementation, the heat-conducting member is attached to the small side surface of the shell.

[0034] The heat-conducting member is attached to the small side surface of the shell, so that the connection between the heat-conducting member and the shell is more secure and less likely to fall off.

[0035] To solve the above technical problems, another technical solution adopted by the present application is to provide a battery device, which includes the above-mentioned battery monomer.

[0036] By arranging the heat-conducting member on the battery monomer of the battery device, the heat generated by the internal elements of the shell can be quickly conducted out through the small side surface, thereby preventing the battery monomer from thermal runaway, and in addition, the cooperation of the flexible heat-conducting member and the rigid heat-conducting member enables the heat-conducting member to work at different temperatures, which is highly reliable.

[0037] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an electrical device that includes the aforementioned battery device.

[0038] By installing heat-conducting components on the battery cells of electrical devices, the heat generated by the internal components of the casing can be quickly dissipated through the small side, thereby preventing thermal runaway of the battery cells. In addition, the combination of flexible and rigid heat-conducting components allows the heat-conducting components to work at different temperatures, resulting in high reliability.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above contents and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments of this application;

[0042] Figure 2 This is a schematic diagram of the structure of a battery device according to one or more embodiments of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application;

[0044] Figure 4 This is a side view structural diagram of a battery cell according to one or more embodiments of this application;

[0045] Figure 5 for Figure 4 A schematic diagram of the heat-conducting component along a cross-section of A-A' in one or more embodiments of the present invention;

[0046] Figure 6 for Figure 4 A cross-sectional structural diagram of the heat-conducting element along A-A' in one or more other embodiments;

[0047] Figure 7 This is a side view structural schematic diagram of a battery cell according to one or more embodiments of this application;

[0048] Figure 8 A side view structural schematic diagram of a battery cell according to yet one or more embodiments of the present application;

[0049] Figure 9 A side view structural schematic diagram of a battery cell according to yet one or more embodiments of the present application.

[0050] Wherein, 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-box; 11-first part; 12-second part; 20-battery cell; 21-housing; 22-connector; 23-electrode assembly; 23a-tab; 24-insulating piece; 211-end cover assembly; 211a-electrode terminal; 212-outer shell; 215-small side; 25-heat conducting piece; 251-flexible heat conducting piece; 252-rigid heat conducting piece; 511-first opening; 512-second opening; 521-third opening. DETAILED DESCRIPTION

[0051] The 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 therefore only serve as examples, and cannot limit the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0053] 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, unless otherwise explicitly and specifically limited, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0054] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] The battery cell disclosed in the embodiments of the present application can be used in, but is not limited to, electric equipment such as vehicles, ships or aircraft. The power supply system of the electric equipment can be composed of the battery cell and the battery disclosed in the present application.

[0059] The embodiments of the present application provide a kind of electric equipment using battery as power supply, and electric equipment can be, but is not limited to, mobile phone, tablet computer, notebook computer, electric toy, electric tool, electric car, electric car, ship, spacecraft and so on.Electric toy can include fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric plane toy and so on, spacecraft can include airplane, rocket, space shuttle and spacecraft and so on.

[0060] The battery monomer 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. Generally, a heat-conducting or cooling component is arranged at the large side of the shell of the battery monomer, so as to cool the large side of the shell of the battery. However, it is found through research that when the battery monomer is overheated or thermal runaway occurs, the temperature at the small side of the battery monomer is higher than that at the large side. However, the small side of the shell is not provided with a separate heat-conducting or heat-dissipating structure in the prior art, and therefore the reliability of the existing battery monomer 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 good heat dissipation effect, but cannot buffer when the battery monomer is deformed due to overheating, and a large pressure is generated on the battery monomer. The heat-conducting effect of the silica gel material is not as good as that of the metal material such as the cold plate.

[0061] Based on the above considerations, in order to solve the technical problem of insufficient reliability of the battery monomer in the prior art, the present application provides a battery monomer, a battery device and an electric equipment. The battery monomer includes a shell. The shell, an electrode assembly and a heat-conducting piece. The shell forms a containing space. The shell has a large side and a small side, and the surface area of the small side is smaller than that of the large side. The electrode assembly is arranged in the containing space. The heat-conducting piece is arranged against the small side of the shell. The heat-conducting piece includes a flexible heat-conducting piece and a rigid heat-conducting piece, and the flexible heat-conducting piece is connected with the rigid heat-conducting piece. By arranging the heat-conducting piece at the small side of the shell, the heat at the small side of the shell can be conducted out, the heat dissipation of the battery monomer is accelerated, and the reliability of the battery monomer is enhanced. The combination of the rigid heat-conducting piece and the flexible heat-conducting piece takes into account the effects of buffering the expansion of the shell and good heat dissipation effect.

[0062] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0063] Please refer to Figure 1 , Figure 1 for a structural schematic view of the vehicle according to one or more embodiments of the present application.

[0064] The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0065] 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 serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 With Figure 3 , Figure 2 is a structural schematic 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 a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define a containing space for containing the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which covers the open side of the second part 12 to make the first part 11 and the second part 12 jointly define the containing space; the first part 11 and the second part 12 can also 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 various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box body 10; of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between 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.

[0068] Please refer to Figure 3 , Figure 3 is a structural schematic 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 constitutes the battery device 100. As shown in 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 a shell 212 having 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 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 shell 212 to fit the shell 212. Alternatively, the end cap assembly 211 can be made of a material having certain hardness and strength, such as an aluminum alloy, so that the end cap assembly 211 is less likely to deform when subjected to a pressing impact, and the battery cell 20 can have higher structural strength and improved safety performance. The end cap assembly 211 can be provided with functional components such as an electrode terminal 211a. The electrode terminal 211a can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electric energy of the battery cell 20. In some embodiments, the end cap assembly 211 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value. The material of the end cap assembly 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member 24 can also be provided on the inner side of the end cap assembly 211, and the insulating member 24 can be used to isolate the electrically connected components in the 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 shell 212 is a component used to fit the end cap assembly 211 to form the internal environment of the battery cell 20, and the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The shell 212 and the end cap assembly 211 can be independent components, and the shell 212 can be provided with an opening, and the end cap assembly 211 covers the opening to form the internal environment of the battery cell 20.

[0069] Without limitation, the end cap assembly 211 and the shell 212 can also be integrated, specifically, the end cap assembly 211 and the shell 212 can form a common connecting surface before other components enter the shell, and the end cap assembly 211 covers the shell 212 when it is necessary to seal the internal environment of the shell 212. The shell 212 can be various shapes and sizes, such as a cuboid, a cylinder, 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 23. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. The shell 212 can be provided with an electrode lead-out portion (not shown in the figure) for electrically connecting with the tab 23a for outputting or inputting the electric energy of the battery cell 20.

[0070] The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained within the case 212. The electrode assembly 23 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 23, and portions without active materials that each constitute a tab 23a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a is connected to the electrode terminal 211a by the connecting member 22 to form a current loop.

[0071] To improve the reliability of the battery device, the present application provides a battery cell, a battery device, and an electrical equipment. Please refer to Figure 4 and Figure 5 , Figure 4 is a schematic view of a side view structure of a battery cell according to one or more embodiments of the present application; Figure 5 is a schematic view of a cross-sectional structure along A-A' of one or more embodiments of the heat-conducting member in Figure 4 The battery cell 20 includes a case 21, an electrode assembly 23, and a heat-conducting member 25. The case 21 forms a housing space. The case 21 has a large side and a small side 215, and the surface area of the small side 215 is smaller than that of the large side. The electrode assembly 23 is disposed in the housing space. The heat-conducting member 25 is disposed against the outer surface of the small side 215 of the case 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.

[0072] The shell 21 generally has four sides, two opposite sides have a larger surface area, and the other two opposite sides have a smaller surface area. Among them, the two sides with a larger surface area can be referred to as large sides, and the two sides with a smaller surface area can be referred to as small sides 215. The electrode assembly 23 is the main component where electrochemical reactions occur, and it is also the component in the battery monomer 20 that is most prone to heat generation and thermal runaway. The temperature at the small side 215 of the shell 21 of the battery monomer 20 is generally higher than the temperature at the large side. The heat-conducting member 25 is a component for conducting heat. Therefore, by arranging the heat-conducting member 25 at the small side 215 of the shell 21, the heat generated by the electrode assembly 23 inside the shell 21 can be more effectively conducted out. The flexible heat-conducting member 251 is a heat-conducting member 25 with flexibility, which can deform to cushion when subjected to force. The rigid heat-conducting member 252 is a heat-conducting member 25 made of hard material, and some metal materials or non-metal materials with good heat conduction are generally 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 by layering, adjacent, wrapping, or mixing. Flexible materials can deform, so the flexible heat-conducting member 251 and the rigid heat-conducting member 252 can be connected in various ways. For example, the mixing connection can be that the rigid heat-conducting member 252 is made into a powder or a particle, and then poured into the softened flexible heat-conducting member 251 and stirred. After the flexible heat-conducting member 251 solidifies, the flexible heat-conducting member 251 will be mixed with the rigid heat-conducting member 252, thereby achieving mixing connection.

[0073] By arranging the heat-conducting member 25 at the small side 215 of the shell 21, the heat generated by the internal components of the shell 21 can be quickly conducted out through the small side 215, thereby preventing the battery monomer 20 from thermal runaway. In addition, by cooperating the flexible heat-conducting member 251 with the rigid heat-conducting member 252, the heat-conducting member 25 can work at different temperatures, has a buffering function, high heat conduction performance, and high reliability.

[0074] In one possible implementation, the flexible heat-conducting member 251 forms an accommodation space, and the rigid heat-conducting member 252 is arranged in the accommodation space. The flexible heat-conducting member 251 is connected to the small side 215 of the shell 21.

[0075] The flexible heat-conducting member 251 can be a hollow structure, thereby forming an accommodation space, and the rigid heat-conducting member 252 is arranged in the accommodation space. Alternatively, please further refer to Figure 6 , Figure 6 For Figure 4A cross-sectional view of the heat-conducting member according to another or more embodiments of the present application along A-A'. The flexible heat-conducting member 251 can be a sandwich structure, divided into two parts, with a space formed in the middle to hold the rigid heat-conducting member 252. The flexible heat-conducting member 251 and the rigid heat-conducting member 252 can be connected by means of adhesion. The flexible heat-conducting member 251 is connected to the small side surface 215 of the shell 21, so that the shell 21 and the rigid heat-conducting member 252 are separated by the flexible heat-conducting member 251, preventing the shell 21 from being worn by the rigid heat-conducting member 252.

[0076] In this way, the flexible heat-conducting member 251 is arranged outside, so that when the shell 21 or the rigid heat-conducting member 252 is deformed by heat, the flexible heat-conducting member 251 can provide a certain buffer, enhancing the stability of the battery monomer 20.

[0077] In a possible embodiment, the flexible heat-conducting member 251 completely wraps the rigid heat-conducting member 252.

[0078] The flexible heat-conducting member 251 completely wraps the rigid heat-conducting member 252, i.e. the rigid heat-conducting member 252 is surrounded by the flexible heat-conducting member 251. The space formed by the flexible heat-conducting member 251 is a closed space, and the rigid heat-conducting member 252 is arranged in this space. This structure can be achieved by arranging the flexible heat-conducting member 251 in various directions of the rigid heat-conducting member 252, or by spraying a layer of the flexible heat-conducting member 251, then spraying a layer of the rigid heat-conducting member 252 on the layer of the flexible heat-conducting member 251, and finally spraying a layer of the flexible heat-conducting member 251 to completely enclose part of the rigid heat-conducting member 252. Alternatively, the flexible heat-conducting member 251 can completely wrap the rigid heat-conducting member 252 by means of a mold.

[0079] This way can further prevent the rigid heat-conducting member 252 from being scratched or rubbed by the shell 21 or other components, thereby reducing the possibility of damage to the battery monomer 20.

[0080] Please refer to Figure 7 , Figure 7 A side view of the battery monomer according to another or more embodiments of the present application. In a possible embodiment, the flexible heat-conducting member 251 has a first opening 511 formed thereon, and the rigid heat-conducting member 252 is arranged to avoid the first opening 511, so that the first opening 511 exposes the small side surface 215 of the shell 21.

[0081] The first opening 511 can be arranged at 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 multiple. 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 shell 21. The shape of the first opening 511 can be circular, oval, quasi-circular, sector, polygon, or the like, which can be arranged according to actual needs. The polygon can be rectangular, parallelogram, triangular, trapezoidal, pentagonal, hexagonal, or the like. 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 avoids the first opening 511, i.e., the rigid heat-conducting member 252 is not arranged at the first opening 511. The rigid heat-conducting member 252 can be completely wrapped by the flexible heat-conducting member 251, or exposed outside the flexible heat-conducting member 251 at other positions.

[0082] The first opening 511 is arranged for two purposes. One is to expose the small side surface 215 of the shell 21, so as to connect with other components. The other is to provide more space for the flexible heat-conducting member 251 when the shell 21 and the rigid heat-conducting member 252 expand when the heat is high.

[0083] Please refer to Figure 8 , Figure 8 FIG. 6 is a schematic view of a side structure of a battery cell according to another embodiment of the present application. In a possible embodiment, the flexible heat-conducting member 251 is formed with a second opening 512, and the rigid heat-conducting member 252 is exposed through the second opening 512.

[0084] The second opening 512 can be arranged at 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 multiple. 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 shell 21. The shape of the second opening 512 can be circular, oval, quasi-circular, sector, polygon, or the like, which can be arranged according to actual needs. The polygon can be rectangular, parallelogram, triangular, trapezoidal, pentagonal, hexagonal, or the like. The second opening 512 is arranged with the rigid heat-conducting member 252, so that the rigid heat-conducting member 252 can be exposed through the second opening 512, while the shell 21 is not exposed through the second opening 512.

[0085] This arrangement can directly expose the rigid heat-conducting member 252, so as to improve the heat dissipation performance of the rigid heat-conducting member 252, and thus improve the heat dissipation performance of the heat-conducting member 25.

[0086] Please refer to Figure 9 , Figure 9FIG. 6 is a schematic view of a side structure of a battery cell according to another embodiment of the present application. In one possible embodiment, the rigid heat-conducting member 252 is provided with a third opening 521 corresponding to the second opening 512 to expose the small side surface 215 of the shell 21.

[0087] The third opening 521 can be provided in the middle of the rigid heat-conducting member 252 or at other positions of the rigid heat-conducting member 252, as long as it is provided corresponding to the second opening 512. The third opening 521 can be one or multiple. 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 shell 21. The shape of the third opening 521 can be circular, oval, quasi-circular, sector, polygon, etc., which can be set according to actual needs. The polygon can be rectangular, parallelogram, triangular, trapezoidal, pentagonal, hexagonal, 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 can be equal to the opening area of the second opening 512.

[0088] This arrangement can expose the small side surface 215 of the shell 21 for convenient connection, and also expose part of the rigid heat-conducting member 252 to improve the heat dissipation performance of the heat-conducting member 25.

[0089] In one 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.

[0090] The volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 can be any value in the range of 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 in the range of any two values in the above range.

[0091] This arrangement can ensure that the proportion of the flexible heat-conducting member 251 is large enough to achieve the buffering effect.

[0092] In one 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.

[0093] The volume ratio of the rigid heat-conducting member 252 to the flexible heat-conducting member 251 can be any value in the range of 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 in the range of any two values in the above range.

[0094] In this way, the flexible heat-conducting member 251 can ensure the buffering effect, and the rigid heat-conducting member 252 can ensure the good heat conduction effect.

[0095] In a possible implementation, the thickness of the heat-conducting member 25 is 0.1-5 mm; in the height direction of the shell 21, the ratio of the size of the heat-conducting member 25 to the size of the shell 21 is 0.5:1 to 1:1; in the thickness direction of the shell 21, the ratio of the size of the heat-conducting member 25 to the size of the shell 21 is 0.5:1 to 1:1.

[0096] The thickness of the heat-conducting member 25 can be any value in 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 in any two of the above ranges. In the height direction of the shell 21, i.e., 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 shell 21 can be any value in 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 in any two of the above ranges. In the thickness direction of the shell 21, i.e., 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 shell 21 can be any value in 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 in any two of the above ranges.

[0097] In this way, the size of the heat-conducting member 25 can be ensured to be large enough to conduct heat to the small side surface 215 of the shell 21.

[0098] In a possible implementation, the thickness of the heat-conducting member 25 is 1-3 mm; in the height direction of the shell 21, the ratio of the size of the heat-conducting member 25 to the size of the shell 21 is 0.8:1 to 1:1; in the thickness direction of the shell 21, the ratio of the size of the heat-conducting member 25 to the size of the shell 21 is 0.8:1 to 1:1.

[0099] The thickness of the heat-conducting member 25 can be any value in the range of 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 in the range of any two values in the above range. The ratio of the size of the heat-conducting member 25 to the size of the shell 21 in the height direction of the shell 21, i.e., the length direction of the heat-conducting member 25, can be any value in the range of 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 in the range of any two values in the above range. The ratio of the size of the heat-conducting member 25 to the size of the shell 21 in the thickness direction of the shell 21, i.e., the width direction of the heat-conducting member 25, can be any value in the range of 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 in the range of any two values in the above range.

[0100] Such an arrangement can make the heat-conducting member 25 have better heat-conducting effect.

[0101] In a possible implementation, the flexible heat-conducting member 251 is an elastic heat-conducting member 25.

[0102] The elastic heat-conducting member 25 is a heat-conducting member 25 with elasticity. The elastic heat-conducting member 25 can deform when subjected to force and return to its original state after the force disappears, thus having good buffering effect and better stability.

[0103] The elastic heat-conducting member 25 has better buffering effect.

[0104] In a possible implementation, the flexible heat-conducting member 251 includes silica gel, aerogel, polyamide, or resin.

[0105] Silica gel, aerogel, polyamide, and resin all have good elasticity and softness, and thus can be used to make the flexible heat-conducting member 251.

[0106] The above-mentioned materials have low cost and have the characteristics of both heat conduction and elasticity.

[0107] 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.

[0108] Metal powder is a powdered metal material, which can be a metal ground into powder. Metal oxide, metal nitride, or inorganic non-metallic material are all commonly used heat-conducting materials.

[0109] The metal powder, the metal oxide, the metal nitride and the inorganic non-metallic material are all rigid materials and have good thermal conductivity.

[0110] 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; and the inorganic non-metallic material includes graphite, silicon carbide, carbon fiber, carbon nanotube, graphene or beryllium carbide.

[0111] Copper, aluminum, iron, tin and nickel all have good thermal conductivity, so their powders also have good thermal conductivity. Moreover, using the powders can save more materials than directly using whole pieces 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 the rigid thermal conductive member 252. Similarly, aluminum nitride, boron nitride or silicon nitride also have good thermal conductivity. Graphite, silicon carbide, carbon fiber, carbon nanotube, graphene or beryllium carbide are not metals, but all have good thermal conductivity and can also be used as the rigid thermal conductive member 252.

[0112] The above materials are low in cost, common and good in thermal conductivity.

[0113] In a possible implementation, the thermal conductive member 25 is attached to the small side surface 215 of the shell 21.

[0114] The thermal conductive member 25 can be attached to the shell 21, and the adhesive used for the attachment can be double-sided thermal conductive adhesive, which can achieve the attachment and also conduct heat.

[0115] The thermal conductive member 25 is attached to the small side surface 215 of the shell 21, so that the attachment between the thermal conductive member 25 and the shell 21 is more secure and less likely to fall off.

[0116] To solve the above technical problem, another technical solution adopted by the present application is to provide a battery device including the battery monomer 20.

[0117] The thermal conductive member 25 is arranged on the battery monomer 20 of the battery device, so that the heat generated by the internal elements of the shell 21 can be quickly conducted out through the small side surface 215, thereby preventing the battery monomer 20 from thermal runaway. In addition, the cooperation of the flexible thermal conductive member 251 and the rigid thermal conductive member 252 enables the thermal conductive member 25 to work at different temperatures and have high reliability.

[0118] To solve the above technical problem, another technical solution adopted by the present application is to provide an electric device including the battery device.

[0119] By arranging the heat-conducting member 25 on the battery monomer 20 of the battery device of the electrical equipment, the heat generated by the internal elements of the shell 21 can be quickly conducted out through the small side surface 215, thereby preventing the battery monomer 20 from thermal runaway, and by 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, and the reliability is strong.

[0120] The above-mentioned partial embodiments are experimentally demonstrated in the following manner:

[0121] Thermal runaway test method:

[0122] 1. Battery monomer state: The top cover and the pole need to be welded with 1 layer of soft bar, 100% SOC; Test cell temperature: 25±3℃. Please ensure the initial temperature of the cell before the experiment.

[0123] Arrange the temperature sensing line; voltage line arrangement: V positive and negative / V positive to shell / V negative to shell; multi-channel acquisition frequency: ≤0.1S.

[0124] 2. Assembly fixture: fixture force 3000N, fixture upper surface / cell top cover flush; cell bottom suspended treatment, suspended height≥5mm. Assembly state: both sides of the battery monomer are clamped.

[0125] 3. Test procedure: heating rate: 5℃ / min; first step: 60℃ for 5h; second step: according to 5℃ / min heating, keep for 30min every 5℃, until the cell fails or 24h.

[0126] 4. Stand for 1h.

[0127] Example data:

[0128]

[0129] Table I

[0130] Referring to Table I, through the above experiment, it can be demonstrated that the heat-conducting member of the application has good heat conduction effect, which can effectively prevent the adjacent battery monomers from thermal runaway when the battery monomer temperature is high, thereby improving the reliability of the battery monomer, the battery device and the electrical equipment.

[0131] Finally, in a specific application scenario, in order to solve the technical problem of the reliability of the battery device, the application provides a battery monomer 20, which comprises a shell 21, an electrode assembly 23 and a heat-conducting member 25. The shell 21 forms a containing space. The shell 21 has a large side and a small side 215, and the surface area of the small side 215 is smaller than that of the large side. The electrode assembly 23 is arranged in the containing space. The heat-conducting member 25 is arranged against the outer surface of the small side 215 of the shell 21. The heat-conducting member 25 comprises a flexible heat-conducting member 251 and a rigid heat-conducting member 252, and the flexible heat-conducting member 251 is connected with the rigid heat-conducting member 252. The flexible heat-conducting member 251 has a containing space formed therein, and the rigid heat-conducting member 252 is arranged in the containing space and connected with the small side 215 of the shell 21. The flexible heat-conducting member 251 comprises silicone, aerogel, polyamide or resin. The rigid heat-conducting member 252 comprises one or more of metal powder, metal oxide, metal nitride or inorganic non-metallic material.

[0132] By arranging the heat-conducting member 25 on the small side 215 of the shell 21, the heat generated by the internal elements of the shell 21 can be quickly conducted out through the small side 215, thereby preventing the battery monomer 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 realize the buffering function, has high heat conduction performance, and has high reliability. By arranging the flexible heat-conducting member 251 outside, a certain buffer can be generated when the shell 21 or the rigid heat-conducting member 252 is deformed by heat, thereby enhancing the stability of the battery monomer 20. The above-mentioned various types have low cost and have the characteristics of heat conduction and elasticity. The metal powder, the metal oxide, the metal nitride and the inorganic non-metallic material are all rigid materials and have good heat conductivity.

[0133] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 application, and they should be covered in the scope of the claims and the description of the application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The 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 by, The battery cell comprises: a shell forming a receiving space, the shell having a large side and a small side, the small side having a smaller surface area than the large side; an electrode assembly disposed in the receiving space; a heat-conducting member disposed against an outer surface of the small side of the shell, the heat-conducting member comprising a flexible heat-conducting member and a rigid heat-conducting member, the flexible heat-conducting member being connected to the rigid heat-conducting member, the flexible heat-conducting member having a receiving space formed therein, the rigid heat-conducting member being disposed in the receiving space, the flexible heat-conducting member being connected to the small side of the shell; the flexible heat-conducting member completely wrapping the rigid heat-conducting member, the flexible heat-conducting member having a first opening formed therein, the rigid heat-conducting member being disposed away from the first opening, the first opening exposing the small side of the shell; or, the flexible heat-conducting member having a second opening formed therein, the rigid heat-conducting member being exposed through the second opening, the rigid heat-conducting member having a third opening formed therein, the third opening being disposed in correspondence with the second opening to expose the small side of the shell.

2. The battery cell of claim 1, wherein, The volume ratio of the rigid heat-conducting member to the flexible heat-conducting member is 1:1 to 1:

10.

3. The battery cell of claim 2, wherein, The volume ratio of the rigid heat-conducting member to the flexible heat-conducting member is 1:2 to 1:

5.

4. The battery cell of claim 1, wherein, The thickness of the heat-conducting member is 0.1-5mm; in the height direction of the shell, the size ratio of the heat-conducting member to the shell is 0.5:1 to 1:1; in the thickness direction of the shell, the size ratio of the heat-conducting member to the shell is 0.5:1 to 1:

1.

5. The battery cell of claim 4, wherein, The thickness of the heat-conducting member is 1-3mm; in the height direction of the shell, the size ratio of the heat-conducting member to the shell is 0.8:1 to 1:1; in the thickness direction of the shell, the size ratio of the heat-conducting member to the shell is 0.8:1 to 1:

1.

6. The battery cell of claim 1, wherein, The flexible heat-conducting member is an elastic heat-conducting member.

7. The battery cell of claim 1, wherein, The flexible heat-conducting member comprises silica gel, aerogel or resin.

8. The battery cell of claim 1, wherein, The rigid heat-conducting member comprises one or more of metal powder, metal oxide, metal nitride or inorganic non-metallic material.

9. The battery cell of claim 8, wherein, The metal powder comprises copper powder, aluminum powder, iron powder, tin powder or nickel powder; the metal oxide comprises aluminum oxide, bismuth oxide, beryllium oxide, magnesium oxide or zinc oxide; the metal nitride comprises aluminum nitride, boron nitride or silicon nitride; the inorganic non-metallic material comprises graphite, silicon carbide, carbon fiber, carbon nanotube, graphene or beryllium carbide.

10. The battery cell of claim 1, wherein, The heat-conducting member is adhesively connected to the small side of the shell.

11. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1-10.

12. An electrical device, characterized by The electric appliance comprises the battery device according to claim 11.

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