Battery monomer, battery device and electric device

Abstract

The utility model relates to the technical field of battery structures, and provides a single battery, a battery device and a power utilization device.The single battery comprises a shell, an end cover, an electrode assembly, an adapter and an insulating part, the end cover is provided with an electrode terminal, a tab part of the electrode assembly is arranged at the end, facing the end cover, of a main body part, and the adapter is electrically connected with the tab part and the electrode terminal; the insulating part is arranged on the side wall face, facing the interior of the containing cavity, of the end cover, one part of the insulating part is arranged between the adapter and the end cover, and the other part of the insulating part is arranged between the adapter and the main body part; according to the battery monomer provided by the embodiment of the invention, one part of the insulating part is arranged between the adapter and the end cover to separate the adapter from the end cover so as to reduce the probability of short circuit between the adapter and the end cover, and the other part of the insulating part is arranged between the adapter and the main body part to separate the adapter from the main body part so as to reduce the probability of short circuit between the adapter and the main body part. The probability of short circuit between the adapter and the main body part is reduced, so that the probability of short circuit between the electrode assembly can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery structure, and particularly provides a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In the use process of the battery monomer, there is a phenomenon of swelling caused by internal heating and gas production; at this time, the explosion-proof valve provided on the battery monomer will be opened to achieve pressure relief. In the process of opening the valve to relieve pressure, the internal electrode assembly may move, causing the probability of short circuit of the electrode assembly to increase. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a battery monomer, a battery device and a power utilization device, aiming to solve the problem of the risk of short circuit of the electrode assembly in the related art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the embodiments of the present application is as follows:

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell, an end cover, an electrode assembly, an adapter and an insulating piece, the shell is provided with a containing cavity with an opening, the end cover covers the opening, the end cover is provided with an electrode terminal, the electrode assembly is accommodated in the containing cavity, the electrode assembly comprises a main body part and a tab part, the tab part is arranged at one end of the main body part facing the end cover; the adapter is electrically connected to the tab part and the electrode terminal, the insulating piece is arranged on a side wall surface of the end cover facing the containing cavity, a part of the insulating piece is arranged between the adapter and the end cover, and another part of the insulating piece is arranged between the adapter and the main body part.

[0006] The battery monomer provided by the embodiments of the present application can form insulation protection for the end cover by arranging the insulating piece on the side wall surface of the end cover facing the containing cavity, meanwhile, a part of the insulating piece is arranged between the adapter and the end cover to separate the adapter and the end cover, so as to reduce the probability of short circuit of the adapter and the end cover, and another part of the insulating piece is arranged between the adapter and the main body part to separate the adapter and the main body part, so as to reduce the probability of short circuit of the adapter and the main body part; meanwhile, the part of the insulating piece between the adapter and the end cover and the other part of the insulating piece between the adapter and the main body part can form double protection between the end cover and the electrode assembly, so as to further reduce the probability of short circuit between the end cover and the electrode assembly.

[0007] In some embodiments, the insulating piece comprises a first insulating part and a second insulating part, the first insulating part is arranged between the adapter and the end cover, and the first insulating part is connected to the end cover, and the second insulating part is arranged between the adapter and the main body part.

[0008] By adopting the technical scheme, the first insulation part is used to form insulation protection on the end cover, and the second insulation part is used to further form insulation protection between the adapter and the main body part, so as to further reduce the probability of short circuit of the electrode assembly.

[0009] In some embodiments, the first insulation part and the second insulation part are integrally formed.

[0010] By adopting the technical scheme, the first insulation part and the second insulation part are integrally formed, and the connection and assembly operation is more convenient.

[0011] In some embodiments, a fold is arranged at the connection between the first insulation part and the second insulation part, and the first insulation part is connected to the second insulation part.

[0012] By adopting the technical scheme, the second insulation part can be rotated around the fold, so that the first insulation part and the second insulation part can be assembled in sections, thereby improving the convenience of assembly.

[0013] In some embodiments, at least one end of the first insulation part is provided with the second insulation part in the length direction of the end cover.

[0014] By adopting the technical scheme, the second insulation part can be arranged on one side or opposite sides of the first insulation part in the length direction of the end cover, and the second insulation part is flipped around the fold to realize assembly.

[0015] In some embodiments, the second insulation part is connected to the first insulation part, and / or the second insulation part is connected to the end cover.

[0016] By adopting the technical scheme, the second insulation part can be fixed by connecting the first insulation part and / or connecting the end cover, so as to avoid the problem of dislocation of the second insulation part affecting assembly.

[0017] In some embodiments, the first insulation part is provided with a first fixing structure, and the second insulation part is fixedly connected to the first fixing structure; and / or the end cover is provided with a second fixing structure on a side wall surface facing the accommodating cavity, and the second insulation part is fixedly connected to the second fixing structure.

[0018] By adopting the technical scheme, the first fixing structure can be used to fix and assemble the second insulation part; and / or the second fixing structure can be used to fix and assemble the second insulation part.

[0019] In some embodiments, the distance between the second insulation part and the main body part is smaller than the distance between the first insulation part and the main body part.

[0020] By adopting the technical scheme, the second insulation part is closer to the main body part, that is, the second insulation part is used to form support on the main body part to reduce the probability of movement of the electrode assembly.

[0021] In some embodiments, the surface area of the second insulation part towards the side of the main body part is M, and the surface area of the main body part towards the side of the end cover is N, wherein 0.3≤M / N≤0.6.

[0022] By adopting the technical solution, the ratio of the surface area of the second insulation part towards the side of the main body part to the surface area of the main body part towards the side of the end cover is limited, so that the second insulation part has sufficient supporting area for the main body part, thereby ensuring the supporting strength of the second insulation part for the electrode assembly.

[0023] In some embodiments, 0.4≤M / N≤0.6.

[0024] By adopting the technical solution, the ratio of the surface area of the second insulation part towards the side of the main body part to the surface area of the main body part towards the side of the end cover is further limited, thereby further improving the supporting strength of the second insulation part for the electrode assembly.

[0025] In some embodiments, at least part of the insulation piece is a temperature-resistant part, and the melting point of the temperature-resistant part is not less than 300°C.

[0026] By adopting the technical solution, at least part of the insulation piece is a temperature-resistant part, thereby making the temperature-resistant performance of the insulation piece more excellent.

[0027] In some embodiments, at least part of the opposite ends of the insulation piece in the width direction of the end cover is a temperature-resistant part.

[0028] By adopting the technical solution, by arranging the temperature-resistant part at the opposite ends of the insulation piece in the width direction of the end cover, the heat-resistant capability of the insulation piece near the end part in the width direction of the end cover, that is, the heat-resistant capability of the insulation piece near the large surface of the shell, can be effectively improved, thereby effectively ensuring the supporting performance of the insulation piece under high-temperature working conditions.

[0029] In a second aspect, the embodiments of the present application further provide a battery device, comprising the battery monomer as described above.

[0030] The battery device provided by the embodiments of the present application comprises the battery monomer as described above, and the stability of the battery device is more excellent when the probability of short circuit of the battery monomer as described above is lower.

[0031] In a third aspect, the embodiments of the present application further provide a power-consuming device, comprising the battery monomer as described above or the battery device as described above, and the battery monomer or the battery device is used to provide electric energy.

[0032] The power-consuming device provided by the embodiments of the present application comprises the battery monomer or the battery device as described above, and the stability of the power-consuming device is more excellent. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the 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.

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0036] Figure 3 A schematic diagram showing the exploded structure of a first type of battery cell provided in some embodiments of this application;

[0037] Figure 4 This is an exploded structural diagram of a second type of battery cell provided in some embodiments of this application;

[0038] Figure 5 An exploded structural diagram of a second type of battery cell provided in some embodiments of this application from another perspective;

[0039] Figure 6 This is an exploded structural diagram of a third type of battery cell provided in some embodiments of this application.

[0040] The following are the labeling elements in the figure:

[0041] 1000, vehicles;

[0042] 100. Battery assembly; 200. Controller; 300. Motor;

[0043] 10. Box; 11. First box; 12. Second box;

[0044] 20. Battery cell;

[0045] 21. End cap; 21a. Electrode terminal; X. Length direction; Y. Width direction;

[0046] 22. Housing; 221. Receiving cavity; 23. Electrode assembly; 231. Main body; 232. Electrode tab;

[0047] 24. Adapter parts;

[0048] 25. Insulating component; 251. First insulating part; 2511. First fixing structure; 252. Second insulating part; 253. Crease. DETAILED DESCRIPTION

[0049] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0050] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0052] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0054] The battery monomer includes a shell, an end cover, an electrode assembly and the like. The electrode assembly is electrically connected with an electrode terminal arranged on the end cover through a connecting piece to realize input or output of electric energy. During use of the battery monomer, the battery monomer may be swollen due to internal heating and gas production. At this time, an explosion-proof valve arranged on the battery monomer is opened to realize pressure relief. During the opening and pressure relief, the end cover of the battery monomer may be deformed due to swelling, the electrode assembly may move due to loss of support, and the surface of the electrode assembly may be damaged, thereby increasing the probability of short circuit between the electrode assembly and the metal structure such as the connecting piece and the end cover.

[0055] Based on the above considerations, in order to solve the problem that the electrode assembly in the related art may have a risk of short circuit, a battery monomer is designed. An insulating piece is arranged on the side of the end cover of the battery monomer facing the accommodating cavity, and a part of the insulating piece is arranged between the connecting piece and the end cover to separate the connecting piece and the end cover, and another part of the insulating piece is arranged between the connecting piece and the main body to separate the connecting piece and the main body of the electrode assembly. Therefore, the insulating piece can insulate and protect the end cover, and also insulate and protect the connecting piece and the main body, thereby effectively reducing the probability of short circuit of the main body.

[0056] The battery monomer disclosed in the embodiments of the present application can be used in an electric device using a battery device as a power supply or a variety of energy storage systems using a battery device as an energy storage element. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0057] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0058] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or 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, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0059] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 20 connected in series, parallel, or mixed connection through a busbar component.

[0061] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells 20.

[0062] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 into an independent module. As an example, the battery module can be formed by binding a plurality of battery cells 20 with a cable tie.

[0063] In some embodiments, the battery device 100 can be a battery pack, which includes a box body 10 and one or more battery cell assemblies accommodated in the box body 10.

[0064] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box body 10 by fixing the battery module in the box body 10.

[0065] As an example, the battery cell assembly can also be accommodated in the box body 10 by directly fixing a plurality of battery cells 20 in the box body 10.

[0066] As an example, the box 10 can include a first box 11 and a second box 12. The first box 11 and the second box 12 are buckled so that an enclosed space is formed inside the box 10 to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box 11 can be a top cover or a bottom plate.

[0067] As an example, the box 10 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively so that an enclosed space is formed inside the box 10 to accommodate the battery cell assembly.

[0068] In some embodiments, the box 10 can be part of the chassis structure of the vehicle 1000. For example, part of the box 10 can be at least part of the floor of the vehicle 1000, or part of the box 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0069] The technical solutions described in the embodiments of the present application are applicable to various electric devices using the battery cell 20, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0070] In the embodiments of the present application, the battery cell 20 can be a secondary battery, which means that the battery cell 20 can be activated by charging after discharging.

[0071] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0072] Please refer to Figure 3 , Figure 3 The exploded structural diagram of the battery cell 20 is provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery device 100. As shown in Figure 3 , the battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0073] The end cover 21 refers to a component that is fitted to the opening of the case 22 to seal the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the case 22 to fit the case 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength, such as an aluminum alloy, so that the end cover 21 is less likely to deform when subjected to a pressing impact, and the battery cell 20 can have a higher structural strength and improved reliability. The end cover 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a 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 cover 21 can also be provided with a pressure relief mechanism, such as a pressure relief valve 211, for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0074] The case 22 is a component for fitting the end cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The case 22 and the end cover 21 can be independent components, and an opening can be provided on the case 22, and the end cover 21 is fitted to the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 21 and the case 22 can also be integrated, specifically, the end cover 21 and the case 22 can form a common connecting surface before other components enter the case, and when it is necessary to seal the internal environment of the case 22, the end cover 21 is fitted to the case 22. The case 22 can be various shapes and sizes, such as a rectangular cuboid, a cylindrical body, a hexagonal prism, etc. Specifically, the shape of the case 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the case 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0075] 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 in the case 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion with active material constituting a main body portion 231 of the electrode assembly 23, and a portion without active material constituting a tab portion 232 of each of the positive and negative electrode sheets. The positive and negative electrode tabs can be located together at one end of the main body portion 231 or at two ends of the main body portion 231, respectively. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte, and the tab portion 232 is connected to the electrode terminal 21a to form a current loop.

[0076] According to some embodiments of the present application, referring to Figure 3 The battery cell 20 according to some embodiments of the present application comprises a shell 22, an end cover 21, an electrode assembly 23, a connector 24 and an insulating member 25. The shell 22 is provided with a receiving cavity 221 having an opening, and the end cover 21 covers the opening. The end cover 21 is provided with an electrode terminal 21a. The electrode assembly 23 is accommodated in the receiving cavity 221, and comprises a main body 231 and a tab 232 arranged at one end of the main body 231 towards the end cover 21. The connector 24 electrically connects the tab 232 and the electrode terminal 21a. The insulating member 25 is arranged on a side wall of the end cover 21 towards the receiving cavity 221. A part of the insulating member 25 is arranged between the connector 24 and the end cover 21, and another part of the insulating member 25 is arranged between the connector 24 and the main body 231.

[0077] The electrode terminal 21a is a component insulatedly arranged on the end cover 21. The electrode terminal 21a is used to connect the tab 232 of the electrode assembly 23 through the connector 24, so that the current flows into or out of the tab 232 through the electrode terminal 21a. In some embodiments, the electrode terminal 21a can be in a cylindrical structure or a polygonal prism structure. In some embodiments, the electrode terminal 21a is made of a metal material, such as aluminum, copper, iron, silver, gold, steel, alloy or composite metal. Optionally, the number of the electrode terminal 21a can be one, two or more, and the specific number of the electrode terminal 21a can correspond to the same number of the tab 232 of the electrode assembly 23. For example, in some embodiments, when the electrode assembly 23 comprises two tabs 232, such as one positive tab and one negative tab, the number of the electrode terminal 21a on the end cover 21 is also two, such as one positive terminal and one negative terminal. Thus, one connector 24 can be used to connect the positive tab 232 and the positive terminal, and another connector 24 can be used to connect the negative tab 232 and the negative terminal.

[0078] The connector 24 is used to realize the electrical connection between the electrode terminal 21a and the tab 232 of the electrode assembly 23. In some embodiments, the connector 24 can be in a sheet structure, and the connector 24 and the tab 232 and the electrode terminal 21a can be connected by welding or other methods. In some embodiments, the connector 24 is made of a metal material, such as aluminum, copper, iron, silver, gold, steel, alloy or composite metal.

[0079] The insulating member 25 is a structure with good insulation performance. For example, the insulating member 25 can be made of plastic, rubber or other materials. Optionally, the insulating member 25 can be in a sheet structure, a block structure, a layer structure or a combination of the above structures.

[0080] The insulating piece 25 is arranged on a side wall surface of the end cover 21 facing the accommodating cavity 221. The insulating piece 25 can be fixedly connected to the end cover 21 by means of adhesion, buckle connection or the like, so as to realize positioning assembly of the insulating piece 25.

[0081] Part of the insulating piece 25 is arranged between the adapter 24 and the end cover 21, so that the part of the insulating piece 25 can be used for insulating protection of the end cover 21, so as to reduce the probability of short circuit between the end cover 21 and the adapter 24 or the electrode assembly 23. In some embodiments, the part of the insulating piece 25 arranged between the adapter 24 and the end cover 21 can cover a side wall surface of the end cover 21 facing the accommodating cavity 221, so as to realize better insulating protection. It should be understood that the insulating piece 25 should be provided with a relief hole for electrical connection of the electrode terminal 21a and the adapter 24.

[0082] Meanwhile, another part of the insulating piece 25 is arranged between the adapter 24 and the main body 231, so that the other part of the insulating piece 25 can be used for further insulating protection between the adapter 24 and the main body 231, so as to reduce the probability of short circuit between the adapter 24 and the main body 231. In some embodiments, the part of the insulating piece 25 arranged between the adapter 24 and the main body 231 can cover one end of the main body 231 facing the adapter 24; it should be understood that when the part of the insulating piece 25 arranged between the adapter 24 and the main body 231 separates the adapter 24 and the tab portion 232, the insulating piece 25 of this part should be provided with a through hole for electrical connection of the adapter 24 and the tab portion 232. Alternatively, in some other embodiments, the other part of the insulating piece 25 arranged between the adapter 24 and the end cover 21 can only cover a part of the adapter 24, for example, cover other parts of the adapter 24 for connecting the tab portion 232, so that the insulating piece 25 of this part can form separation protection between the main body 231 of the electrode assembly 23 and part of the adapter 24.

[0083] Optionally, the part of the insulating piece 25 arranged between the adapter 24 and the end cover 21 and the other part of the insulating piece 25 arranged between the adapter 24 and the main body 231 can be an integral structure formed by one-piece molding, or can be fixedly connected to form an integral structure by means of adhesion, fusion connection, buckle connection or the like.

[0084] The battery cell 20 provided by the embodiments of the present application forms insulation protection for the end cover 21 by arranging the insulation member 25 on the side wall surface of the end cover 21 facing the accommodating cavity 221, meanwhile, a part of the insulation member 25 is arranged between the adapter 24 and the end cover 21 to separate the adapter 24 and the end cover 21, so as to reduce the probability of short circuit between the adapter 24 and the end cover 21, another part of the insulation member 25 is arranged between the adapter 24 and the main body 231 to separate the adapter 24 and the main body 231, so as to reduce the probability of short circuit between the adapter 24 and the main body 231, meanwhile, the part of the insulation member 25 between the adapter 24 and the end cover 21 and the other part of the insulation member 25 between the adapter 24 and the main body 231 can form double insulation protection between the end cover 21 and the electrode assembly 23, so as to further reduce the probability of short circuit between the end cover 21 and the electrode assembly 23.

[0085] Please refer to Figure 3 , Figure 4 or Figure 6 In some embodiments, the insulation member 25 comprises a first insulation part 251 and a second insulation part 252, the first insulation part 251 is arranged between the adapter 24 and the end cover 21, and the first insulation part 251 is connected to the end cover 21, and the second insulation part 252 is arranged between the adapter 24 and the main body 231.

[0086] The first insulation part 251 is a partial structure with better insulation performance; optionally, the first insulation part 251 can be but is not limited to an insulation layer, an insulation film or the like. The first insulation part 251 is connected to the end cover 21, for example, can be fixedly connected to the side wall surface of the end cover 21 facing the accommodating cavity 221 by bonding, buckling connection or the like. In some embodiments, the first insulation part 251 can completely cover the side wall surface of the end cover 21 facing the accommodating cavity 221, so as to realize insulation protection for the end cover 21. It should be understood that the first insulation part 251 needs to be provided with a relief hole, so as to normally connect the adapter 24 and the electrode terminal 21a, or to normally connect the explosion-proof valve or other functional structure arranged on the end cover 21 and the interior of the accommodating cavity 221.

[0087] The second insulation part 252 is a partial structure with better insulation performance; optionally, the second insulation part 252 can be but is not limited to an insulation layer, an insulation film, an insulation bump or the like. In some embodiments, the second insulation part 252 can be an integral structure similar in size to the first insulation part 251, and the second insulation part 252 is used to further form insulation protection between the adapter 24 and the main body 231 of the electrode assembly 23; it should be understood that the second insulation part 252 needs to be provided with a relief hole (not shown in the figure), so as to normally connect the adapter 24 and the tab part 232, such as Figure 6Alternatively, in other embodiments, the second insulation portion 252 can be provided in a plurality, and each of the plurality of second insulation portions 252 is arranged between the adapter 24 and the main body portion 231 of the electrode assembly 23, and the plurality of second insulation portions 252 can form a separation between the adapter 24 and the main body portion 231, and the plurality of second insulation portions 252 can form a clearance between the adapter 24 and the tab portion 232.

[0088] The second insulation portion 252 can be arranged on the first insulation portion 251, for example, the second insulation portion 252 is integrally formed with the first insulation portion 251, or the second insulation portion 252 is fixedly connected to the first insulation portion 251 by bonding, fusion connection, snap connection, or the like; or the second insulation portion 252 can also be connected to the end cover 21, for example, the first insulation portion 251 and the second insulation portion 252 can be connected to the side wall surface of the end cover 21 facing the accommodation cavity 221, respectively, and the first insulation portion 251 and the second insulation portion 252 jointly cover and protect the wall surface of the end cover 21.

[0089] In this way, the first insulation portion 251 insulates and protects the end cover 21, and the second insulation portion 252 further insulates and protects between the adapter 24 and the main body portion 231, so as to reduce the probability of short circuit between the main body portion 231 of the electrode assembly 23 and the adapter 24.

[0090] Please refer to Figure 3 In some embodiments, the first insulation portion 251 and the second insulation portion 252 are integrally formed.

[0091] In the present embodiment, the first insulation portion 251 and the second insulation portion 252 can be integrally formed, for example, by integrally extruding through a fusion extrusion process.

[0092] In this case, the first insulation portion 251 and the second insulation portion 252 will form a certain gap therebetween, and thus part of the adapter 24 can be inserted into the gap between the first insulation portion 251 and the second insulation portion 252, so as to achieve the purpose that the first insulation portion 251 is located between the adapter 24 and the end cover 21, and the second insulation portion 252 is located between the adapter 24 and the main body portion 231.

[0093] Alternatively, the first insulation part 251 and the second insulation part 252 can be integrally formed and in a non-fixed state, for example, the connection between the first insulation part 251 and the second insulation part 252 has a small thickness, so that the first insulation part 251 and the second insulation part 252 can move relative to the connection, for example, rotate relative to the connection. In this way, during assembly, the first insulation part 251 can be fixed to the end cover 21 first, and then the second insulation part 252 is moved to complete the assembly of the adapter 24.

[0094] In this way, the connection and assembly operation of the integrally formed first insulation part 251 and the second insulation part 252 is more convenient.

[0095] Please refer to Figure 3 In some embodiments, the connection between the first insulation part 251 and the second insulation part 252 is provided with a fold 253; the first insulation part 251 is connected to the second insulation part 252.

[0096] It can be understood that the fold 253 refers to a structure provided at the connection between the first insulation part 251 and the second insulation part 252 and used for assisting in folding. Alternatively, the fold 253 can be a linear groove structure, a point-like groove structure, etc. provided at the connection between the first insulation part 251 and the second insulation part 252, so that the first insulation part 251 and the second insulation part 252 can be folded around the fold 253.

[0097] The first insulation part 251 is connected to the second insulation part 252. Alternatively, the first insulation part 251 and the second insulation part 252 can be connected by bonding, melting connection, buckle connection, etc. It should be understood that since the second insulation part 252 can be folded relative to the first insulation part 251 along the fold 253, during assembly, the first insulation part 251 can be fixedly connected to the end cover 21 first, and then the first insulation part 251 is connected to the second insulation part 252 after the first insulation part 251 is folded to a predetermined position. In this way, the first insulation part 251 and the second insulation part 252 will be fixed, so as to reduce the probability of affecting the assembly in the accommodating cavity 221 due to the movement and dislocation of the second insulation part 252.

[0098] The second insulation part 252 can be integrally formed on the first insulation part 251, and the second insulation part 252 can be located at any position of the first insulation part 251. For example, the second insulation part 252 can be located at the outer peripheral edge of the first insulation part 251, or the second insulation part 252 can be formed on the side surface of the first insulation part 251 facing the main body part 231. In some embodiments, the second insulation part 252 is formed at the opposite ends of the first insulation part 251, respectively, and the second insulation parts 252 at the two ends can be folded around the crease 253 and folded to the side of the main body part 231 until the second insulation parts 252 are folded to abut against the side surface of the first insulation part 251 facing the main body part 231. At this time, part of the adapter 24 is located between the first insulation part 251 and the second insulation part 252. The relative fixation of the first insulation part 251 and the second insulation part 252 can be achieved by connecting the first insulation part 251 and the second insulation part 252.

[0099] In this way, the second insulation part 252 can be rotated around the crease 253, so that the first insulation part 251 and the second insulation part 252 can be assembled in parts, thereby improving the convenience of assembly.

[0100] Please refer to Figure 3 In some embodiments, the second insulation part 252 is arranged at at least one end of the first insulation part 251 in the length direction X of the end cover 21.

[0101] In the length direction X of the end cover 21, the second insulation part 252 is arranged at one end of the first insulation part 251, or the second insulation part 252 is arranged at both ends of the first insulation part 251.

[0102] It should be understood that when the number of electrode terminals 21a arranged on the end cover 21 is two, the two electrode terminals 21a are arranged at intervals along the length direction X of the end cover 21. In this case, by arranging the second insulation part 252 at both ends of the first insulation part 251, the second insulation parts 252 at the two ends are respectively folded around the crease 253 to adhere to the surface of the first insulation part 251 and sandwich the corresponding adapter, and then the first insulation part 251 and the second insulation part 252 are connected and fixed.

[0103] In this way, the second insulation part 252 can be arranged on one side or opposite sides of the first insulation part 251 in the length direction X of the end cover 21, and the second insulation part 252 is folded around the crease 253 to achieve assembly.

[0104] It should be understood that in other embodiments, the second insulation part 252 can also be arranged on one side or opposite sides of the first insulation part 251 in the width direction Y of the end cover 21.

[0105] Please refer to Figure 4 orFigure 6 In some embodiments, the second insulation part 252 is connected to the first insulation part 251; and / or, the second insulation part 252 is connected to the end cover 21.

[0106] In the present embodiment, the first insulation part 251 and the second insulation part 252 can be two independent components. The first insulation part 251 is connected to the surface of the end cover 21; optionally, the second insulation part 252 can be connected to the first insulation part 251 to achieve positioning assembly; or, the second insulation part 252 can be connected to the surface of the end cover 21 to achieve positioning assembly; or, the second insulation part 252 can be connected to both the first insulation part 251 and the end cover 21.

[0107] In some embodiments, the second insulation part 252 can be fixedly connected to the first insulation part 251 by adhesion, fusion connection, buckle connection, etc.; or, the second insulation part 252 can be fixedly connected to the end cover 21 by adhesion, buckle connection, etc.

[0108] In this way, the second insulation part can be fixed by connecting the first insulation part 251 and / or connecting the end cover 21 to avoid the problem of dislocation of the second insulation part 252 affecting assembly.

[0109] Please refer to Figure 4 and Figure 5 In some embodiments, the first insulation part 251 is provided with a first fixing structure 2511, and the second insulation part 252 is fixedly connected to the first fixing structure 2511; and / or, the end cover 21 is provided with a second fixing structure (not shown in the figure) on the side wall surface facing the accommodating cavity 221, and the second insulation part 252 is fixedly connected to the second fixing structure.

[0110] Optionally, the first fixing structure 2511 can be an adhesive layer, so that when the second insulation part 252 is abutted to the first insulation part 251, the adhesive layer can be used to tightly connect the first insulation part 251 and the second insulation part 252. Alternatively, the first fixing structure 2511 can also be a clamping groove, so that a buckle is correspondingly provided on the second insulation part 252, and when the second insulation part 252 is abutted to the first insulation part 251, the buckle can be clamped into the clamping groove to achieve fixed connection.

[0111] In some embodiments, the first fixing structure 2511 can be arranged in a ring shape, and at least part of the first fixing structure 2511 can be connected to the edge of the second insulation part 252 when the second insulation part 252 is abutted to the first insulation part 251.

[0112] Similarly, the second fixing structure can be an adhesive layer, so that when the second insulation part 252 abuts against the end cover 21, the end cover 21 and the second insulation part 252 can be tightly connected by the adhesive layer. Alternatively, the second fixing structure can also be a clamping groove, so that a clamping buckle corresponding to the second insulation part 252 is provided on the second insulation part 252, and when the second insulation part 252 abuts against the end cover 21, the clamping buckle can be clamped into the clamping groove to achieve fixed connection.

[0113] The second fixing structure can be arranged at any position of the end cover 21; in some embodiments, the second fixing structure can be arranged in a ring shape, and at least part of the second fixing structure can be connected to the edge of the second insulation part 252 when the second insulation part 252 abuts against the end cover 21.

[0114] In this way, the first fixing structure 2511 can be used to fix and assemble the second insulation part 252; and / or the second fixing structure can be used to fix and assemble the second insulation part 252.

[0115] Please refer to Figure 4 In some embodiments, the distance between the second insulation part 252 and the main body part 231 is smaller than the distance between the first insulation part 251 and the main body part 231.

[0116] It should be understood that the distance between the second insulation part 252 and the main body part 231 is smaller, i.e. the second insulation part 252 is closer to the main body part 231; when the electrode assembly 23 moves, the second insulation part 252 can abut against the end of the main body part 231 of the electrode assembly 23, so as to reduce the probability of movement of the electrode assembly 23, or to reduce the amplitude of movement of the electrode assembly 23, so as to reduce the probability of damage of the electrode assembly 23.

[0117] In this way, the first insulation part 251 can be located between the adapter 24 and the end cover 21 and used to insulate and protect the end cover 21, the second insulation part 252 can be located between the adapter 24 and the main body part 231 and used to insulate and protect between the adapter 24 and the main body part 231, and the second insulation part 252 can also simultaneously support the main body part 231 to reduce the probability of movement of the electrode assembly 23.

[0118] Please refer to Figure 4 and Figure 5 In some embodiments, the surface area of the second insulation part 252 towards the main body part 231 is M, and the surface area of the main body part 231 towards the end cover 21 is N, wherein 0.3≤M / N≤0.6.

[0119] The surface area N of the main body 231 on the side facing the end cap 21 refers to the surface area of the entire end side including the portion where the tab 232 is provided. It should be understood that the surface area N of the main body 231 on the side facing the end cap 21 is the same as the surface area of any cross section of the surface of the main body 231 on the side facing the end cap 21.

[0120] In the present embodiment, the ratio of the surface area M of the second insulating portion 252 on the side facing the main body 231 to the surface area N of the main body 231 on the side facing the end cap 21 is defined to be greater than or equal to 0.3 and less than or equal to 0.6, so that the second insulating portion 252 has sufficient support area to provide sufficient support strength.

[0121] Please refer to Figure 4 and Figure 5 In some embodiments, 0.4≤M / N≤0.6.

[0122] In this way, by further defining the ratio of the surface area M of the second insulating portion 252 on the side facing the main body 231 to the surface area N of the main body 231 on the side facing the end cap 21, the support strength of the second insulating portion 252 on the electrode assembly 23 is further improved.

[0123] Please refer to Figure 3 , Figure 4 or Figure 6 In some embodiments, at least part of the insulating member 25 is a temperature-resistant portion (not shown in the figure), and the melting point of the temperature-resistant portion is not less than 300°C.

[0124] The temperature-resistant portion refers to a material portion having better high-temperature resistance. Optionally, the temperature-resistant portion can be, but is not limited to, a layer structure, a block structure, etc. formed of a high-temperature resistant material such as a polyimide structure, a polytetrafluoroethylene structure, etc.

[0125] At least part of the insulating member 25 is a temperature-resistant portion. Optionally, part of the insulating member 25 can be replaced with a temperature-resistant portion, and other parts of the insulating member 25 still use ordinary insulating materials; and the temperature-resistant portion and other parts of the insulating member 25 can be connected integrally by bonding. Alternatively, the insulating member 25 is entirely a temperature-resistant portion, i.e., the insulating member 25 is composed of a temperature-resistant portion.

[0126] In this way, at least part of the insulating member 25 adopts a temperature-resistant portion, so that the temperature resistance of the insulating member 25 is more excellent.

[0127] Please refer to Figure 3 , Figure 4 or Figure 6 In some embodiments, at least part of the opposite ends of the insulating member 25 in the width direction Y of the end cap 21 is a temperature-resistant portion.

[0128] In some embodiments, at least a portion of the edges of the insulating member 25 at opposite ends in the width direction Y of the end cover 21 is a high-melting-point temperature-resistant portion; or, a certain range of the edges of the insulating member 25 at opposite ends in the width direction Y of the end cover 21 is a high-melting-point temperature-resistant portion, for example, a range of at least 5 mm from the middle of the insulating member 25 in the width direction Y of the end cover 21 is a temperature-resistant portion.

[0129] The two sides of the end cover 21 in the width direction Y are the sides with larger dimensions, i.e., the direction of the long side; thus, the end cover 21 is in the direction corresponding to the large face of the shell 22 in the width direction Y. It should be understood that the large face of the shell 22 has a larger size and thus the battery cell 20 releases more heat at the large face of the shell 22, so the opposite ends of the insulating member 25 in the width direction Y of the end cover 21 are more likely to soften due to high temperature.

[0130] In this way, by providing temperature-resistant portions at the opposite ends of the insulating member 25 in the width direction Y of the end cover 21, the heat resistance of the insulating member 25 near the end of the end cover 21 in the width direction Y can be effectively improved, i.e., the heat resistance of the insulating member 25 near the large face of the shell 22 can be improved, thereby effectively ensuring the support performance of the insulating member 25 under high-temperature working conditions.

[0131] In the following, the battery cell 20 provided by the present application will be described in detail according to specific embodiments.

[0132] Please refer to Figures 3 to 6 In the present embodiment, the battery cell 20 includes a shell 22, an end cover 21, an electrode assembly 23, a connecting piece 24, and an insulating member 25. The shell 22 is provided with a receiving cavity 221 having an opening, and the end cover 21 covers the opening. The end cover 21 is provided with an electrode terminal 21a. The electrode assembly 23 is accommodated in the receiving cavity 221 and includes a main body portion 231 and a tab portion 232. The tab portion 232 is arranged at one end of the main body portion 231 facing the end cover 21. The connecting piece 24 electrically connects the tab portion 232 and the electrode terminal 21a. The insulating member 25 includes a first insulating portion 251 and a second insulating portion 252. The first insulating portion 251 is arranged between the connecting piece 24 and the end cover 21 and is connected to the end cover 21. The second insulating portion 252 is arranged between the connecting piece 24 and the main body portion 231.

[0133] In the present embodiment, the first insulating portion 251 is used to insulate and protect the end cover 21, and the second insulating portion 252 is used to further insulate and protect the connecting piece 24 and the main body portion 231, which can effectively reduce the probability of short circuit between the electrode assembly 23 and the connecting piece 24 and the end cover 21.

[0134] Please refer toFigure 2 and Figure 3 In a second aspect, the embodiments of the present application further provide a battery device 100 comprising the battery cell 20 as described above.

[0135] The battery device 100 provided by the embodiments of the present application comprises the battery cell 20 as described above, and the stability of the battery device 100 is better in the case that the probability of short circuit of the battery cell 20 is lower.

[0136] Please refer to Figures 1 to 3 In a third aspect, the embodiments of the present application further provide a power consuming device comprising the battery cell 20 as described above or the battery device 100 as described above, and the battery cell 20 or the battery device 100 is used to provide electric energy.

[0137] The power consuming device provided by the embodiments of the present application, for example, the vehicle 1000 as described above, comprises the battery cell 20 or the battery device 100 as described above, and thus the stability of the power consuming device is better.

[0138] The above merely describes the preferred embodiments of the present application, but not for limiting the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized by: The battery cell includes a housing provided with a receiving cavity having an opening; an end cover covering the opening, the end cover being provided with an electrode terminal; an electrode assembly accommodated in the receiving cavity, the electrode assembly including a main body portion and a tab portion provided at one end of the main body portion toward the end cover; an adapter electrically connecting the tab portion and the electrode terminal; and an insulating member provided on a side wall surface of the end cover toward the receiving cavity, a portion of the insulating member being provided between the adapter and the end cover, and another portion of the insulating member being provided between the adapter and the main body portion. The insulating member includes a first insulating portion provided between the adapter and the end cover, and a second insulating portion provided between the adapter and the main body portion.

2. The battery cell of claim 1, wherein: The first insulating portion and the second insulating portion are integrally formed.

3. The battery cell of claim 2, wherein: The first insulating portion and the second insulating portion are connected at a crease; and the first insulating portion is connected to the second insulating portion.

4. The battery cell of claim 3, wherein: At least one end of the first insulating portion is provided with the second insulating portion in a length direction of the end cover.

5. The battery cell of claim 4, wherein: The second insulating portion is connected to the first insulating portion; and / or the second insulating portion is connected to the end cover.

6. The battery cell of claim 2, wherein: The first insulating portion is provided with a first fixing structure, and the second insulating portion is fixedly connected to the first fixing structure; and / or the end cover is provided with a second fixing structure on a side wall surface toward the receiving cavity, and the second insulating portion is fixedly connected to the end cover.

7. The battery cell of any one of claims 3 to 6, wherein: A distance between the second insulating portion and the main body portion is smaller than a distance between the first insulating portion and the main body portion.

8. The battery cell of any one of claims 2 to 7, wherein: A surface area of a side of the second insulating portion toward the main body portion is M, and a surface area of a side of the main body portion toward the end cover is N, wherein 0.3≤M / N≤0.

6.

9. The battery cell of claim 8, wherein: 0.4≤M / N≤0.

6.

10. The battery cell of claim 9, wherein: At least a portion of the insulating member is a temperature-resistant portion having a melting point not less than 300℃.

11. The battery cell of any one of claims 1 to 10, wherein: In a width direction of the end cover, at least a portion of opposite ends of the insulating member is the temperature-resistant portion.

12. The battery cell of claim 11, wherein: The battery cell includes any one of claims 1 to 12.

13. A battery device characterized by comprising: The battery cell or the battery device of claim 13 is used to provide electric energy.

14. An electrical device, characterized by: ​

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