Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery cell includes a case electrode assembly and an end cap assembly. The electrode assembly is arranged in the shell; the end cover assembly covers the shell and is located above the electrode assembly, the end cover assembly comprises an end cover, lower plastic cement and an abutting piece, the lower plastic cement is located on the side, facing the electrode assembly, of the end cover, the abutting piece is located on the side, facing the electrode assembly, of the lower plastic cement and is arranged in a protruding mode relative to the lower plastic cement, and at least part of the abutting piece makes contact with the electrode assembly. When welding slag is generated, the welding slag can stretch into the abutting piece to reduce the sharpness of the welding slag, and therefore the welding slag is prevented from making direct contact with the electrode assembly and piercing the electrode assembly. In the direction perpendicular to the end cover, the length, equivalent to the protruding length of the lower plastic, of the abutting piece can be larger than the length of generated welding slag, the abutting piece can wrap the welding slag so as to prevent the welding slag from making direct contact with the electrode assembly and piercing the electrode assembly, and the electrode assembly can be protected.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] During the assembly process of a battery, most components within the battery cell are usually connected by welding. Therefore, a large amount of welding slag is generated during the welding process. The generated welding slag is likely to extend to the electrode assembly and pierce the separator film of the electrode assembly, resulting in a short circuit of the electrode assembly. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can block welding slag to protect the electrode assembly and reduce the probability of the separator film of the electrode assembly being pierced.

[0004] In a first aspect, the present application provides a battery cell, which includes a housing, an electrode assembly and an end cover assembly. The electrode assembly is disposed inside the housing; the end cover assembly covers the housing and is located above the electrode assembly. The end cover assembly includes an end cover, a lower plastic and a contact member. The lower plastic is located on the side of the end cover facing the electrode assembly, and the contact member is located on the side of the lower plastic facing the electrode assembly and protrudes relative to the lower plastic. At least part of the contact member is in contact with the electrode assembly.

[0005] In the technical solution of the embodiment of the present application, since the contact member is located on the side of the lower plastic facing the electrode assembly and protrudes relative to the lower plastic, after the end cover assembly and the housing are covered, the contact member contacts the electrode assembly first relative to the lower plastic. When welding slag is generated, the welding slag can penetrate into the contact member, that is, the contact member can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby blocking the welding slag from directly contacting the electrode assembly and piercing the electrode assembly.

[0006] In summary, in the direction perpendicular to the end cover, the length by which the contact member protrudes relative to the lower plastic can be greater than the length of the generated welding slag. The contact member can wrap around the outside of the welding slag to block the welding slag from directly contacting the electrode assembly and piercing the electrode assembly, and can protect the electrode assembly.

[0007] In some embodiments, the end cover assembly further includes a positive terminal and a negative terminal. The positive terminal and the negative terminal are spaced apart on the end cover. A lower plastic is respectively provided on the side of the positive terminal and the negative terminal facing the electrode assembly, and each lower plastic is provided with a contact member.

[0008] Since the number of welding operations near each electrode terminal is relatively large and the probability of generating welding slag is relatively high, by providing a contact member on the lower plastic corresponding to each electrode terminal, while using the contact member to block the welding slag to protect the electrode assembly, the number of lower plastics can be reduced, and thus the weight of the end cover assembly can be reduced.

[0009] In some embodiments, the end cap assembly further includes adapter plates. The adapter plates are located on a side of the two lower plastics away from the electrode assembly, and are respectively connected to the corresponding positive terminals and negative terminals, and each adapter plate is disposed close to the abutting member.

[0010] Since welding slag will be generated around the adapter plates when welding the adapter plates, an abutting member is disposed near the adapter plates, so that the position of the abutting member can be accurately set to better exert the function of the abutting member.

[0011] In some embodiments, a side of the lower plastics facing the electrode assembly includes a first installation area and a second installation area that are spaced apart. The first installation area is provided with an adapter plate, and at least part of the second installation area is provided with an abutting member.

[0012] In this way, the installation position of the abutting member can be accurately set, and the range of the second installation area covered by the abutting member can be adjusted according to the actual situation, so as to control the weight of the end cap assembly within a preset range without affecting the use effect of the abutting member.

[0013] In some embodiments, in a direction perpendicular to the end cap, the orthographic projection of the abutting member falls within the orthographic projection of the second installation area.

[0014] In this way, the size of the abutting member can be adjusted according to the specific situation of the current end cap assembly, and the use range of the abutting member can be expanded. In a direction perpendicular to the end cap, making the orthographic projection of the abutting member fall within the orthographic projection of the second installation area can reduce the probability that the abutting member interferes with other components in the housing and causes damage to the abutting member, and can protect the abutting member.

[0015] In some embodiments, the abutting member protrudes from the lower plastics along a third direction. The third direction is parallel to the direction perpendicular to the end cap, and along a first direction, the length by which the abutting member protrudes from the lower plastics is a, and a is less than or equal to 50 mm. The first direction is parallel to the arrangement direction of the first installation area and the second installation area, and the third direction intersects the first direction.

[0016] Limiting the length of the abutting member in the first direction X can reserve a position for the components mounted on the end cap in the first direction X, and can limit the overall size of the abutting member as much as possible to control the weight of the abutting member, and further control the weight of the end cap assembly, reduce the phenomenon that the weight of the end cap assembly is too heavy, and effectively protect the electrode assembly.

[0017] In some embodiments, along a second direction, the length by which the abutting member protrudes from the lower plastics is b, and b is less than or equal to 50 mm. The first direction, the second direction and the third direction intersect pairwise.

[0018] Limit the length of the abutting member in the second direction Y, reserve a position for the component installed on the end cover in the second direction Y, and limit the overall size of the abutting member as much as possible to control the weight of the abutting member, thereby controlling the weight of the end cover assembly, reducing the phenomenon of excessive weight of the end cover assembly, and effectively protecting the electrode assembly.

[0019] In some embodiments, the lower plastic is recessed inwardly away from the electrode assembly to form a groove, and at least part of the abutting member is located in the groove.

[0020] In this way, not only the connection stability between the abutting member and the lower plastic is improved, but also the shape of the abutting member is enriched, and the preparation difficulty of the abutting member is reduced.

[0021] In some embodiments, the abutting member protrudes from the lower plastic in the third direction, and the length by which the abutting member protrudes from the lower plastic in the third direction is c, where c is greater than or equal to 0.1 mm and less than or equal to 3 mm, and the third direction is parallel to the direction perpendicular to the end cover.

[0022] Limit the length of the abutting member in the third direction to limit the overall size of the abutting member as much as possible, control the weight of the abutting member, thereby controlling the weight of the end cover assembly, reducing the phenomenon of excessive weight of the end cover assembly, and effectively protecting the electrode assembly.

[0023] In addition, on the basis of not affecting the use effect of the abutting member, the probability that the abutting member squeezes the electrode assembly due to the excessive length of the protrusion in the third direction relative to the end cover and causes damage to the electrode assembly can be reduced.

[0024] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiments.

[0025] Since the abutting member in the battery is located on the side of the lower plastic facing the electrode assembly and protrudes relative to the lower plastic, after the end cover assembly and the housing are covered, the abutting member contacts the electrode assembly first relative to the lower plastic. When welding slag is generated, the welding slag can penetrate into the abutting member, that is, the abutting member can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly and piercing the electrode assembly.

[0026] In summary, in the direction perpendicular to the end cover, the length by which the abutting member protrudes from the lower plastic can be greater than the length of the generated welding slag. The abutting member can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly and piercing the electrode assembly, and can protect the electrode assembly.

[0027] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiments, and the battery is used to provide electrical energy.

[0028] Since the contact member in the electrical device is located on the side of the lower plastic facing the electrode assembly and protrudes relative to the lower plastic, after the end cap assembly and the housing are closed, the contact member contacts the electrode assembly relative to the lower plastic first. When welding slag is generated, the welding slag can extend into the contact member, that is, the contact member can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly and piercing the electrode assembly.

[0029] In summary, in the direction perpendicular to the end cap, the length by which the contact member protrudes relative to the lower plastic can be greater than the length of the generated welding slag. The contact member can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly and piercing the electrode assembly, and can protect the electrode assembly.

[0030] The above description is only an overview of the technical solution of the present application. In order to be able to more clearly understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0032] Figure 1 It is a schematic structural diagram of a vehicle according to one or more embodiments.

[0033] Figure 2 It is an exploded view of a battery according to one or more embodiments.

[0034] Figure 3 It is a schematic exploded structural diagram of a battery cell according to one or more embodiments.

[0035] Figure 4 It is a cross-sectional view of a battery cell according to one or more embodiments.

[0036] Figure 5 It is a cross-sectional view of an end cap assembly of a battery cell according to one or more embodiments.

[0037] Figure 6 It is a top view of an end cap assembly of a battery cell according to one or more embodiments.

[0038] The reference numerals in the specific embodiments are as follows:

[0039] 1000, vehicle;

[0040] 100, Battery; 200, Controller; 300, Motor;

[0041] 10, Box body; 11, First part; 12, Second part;

[0042] 20, Battery cell; 21, End - cover assembly; 211, Electrode terminal; 2111, Positive - electrode terminal; 2112, Negative - electrode terminal; 212, End - cover; 213, Lower plastic; 2131, First installation area; 2132, Second installation area; 214, Contact part; 215, Adapter plate; 22, Housing; 23, Electrode assembly; X, First direction; Y, Second direction; Z, Third direction. Detailed implementation manners

[0043] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non - exclusive inclusion.

[0045] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, they are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two, unless otherwise specifically defined.

[0046] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of the present application, if the term "and / or" appears, it is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, if the character " / " appears herein, generally it means that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, if it appears, the term "plural" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0049] In the description of the embodiments of the present application, if it appears, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if it appears, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0051] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0052] The current connection method between the adapter plate of the battery cell and the lower plastic is usually fixed by welding. The welding method is prone to the appearance of particulate matters such as welding slag. When the welding slag appears on the side of the adapter plate facing the electrode assembly, that is, inside the battery cell, it cannot only not be detected by the detection equipment, but also cannot be cleaned up. When a large amount of welding slag accumulates, it is also easy for the welding slag to pierce the electrode assembly inside the battery cell and cause the electrode assembly to short-circuit.

[0053] To protect the electrode assembly from being pierced by welding slag, an embodiment of the present application provides a battery cell. On the side of the lower plastic facing the electrode assembly, a contact member is convexly provided. The contact member contacts the electrode assembly earlier than the adapter plate. When welding slag is generated, the welding slag can extend into the contact member, that is, the contact member can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly and piercing the electrode assembly.

[0054] The battery cell disclosed in the embodiment of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cell, battery, etc. disclosed in the present application.

[0055] An embodiment of the present application provides a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0056] For the convenience of description in the following embodiments, a power-consuming device of an embodiment of the present application is taken as an example of a vehicle 1000 for description.

[0057] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is arranged inside the vehicle 1000. The battery 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0058] In some embodiments of the present application, the battery 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, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Please refer to Figure 2 , Figure 2Explosion diagram of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0061] 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. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0062] Please refer to Figure 3 , Figure 3 Schematic exploded view of the battery cell 20 provided by some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery. As Figure 3 shown, the battery cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23, and other functional components.

[0063] The end cap assembly 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 21 can be adapted to the shape of the housing 22 to cooperate with the housing 22. Optionally, the end cap assembly 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap assembly 21 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on the end cap assembly 21. The electrode terminals 211 can be used for electrical connection with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap assembly 21. The material of the end cap assembly 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap assembly 21. The insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap assembly 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0064] The housing 22 is a component used to cooperate with the end cap assembly 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 housing 22 and the end cap assembly 21 can be independent components. An opening can be provided on the housing 22, and the end cap assembly 21 is covered on the opening to form the internal environment of the battery cell 20. Without limitation, the end cap assembly 21 and the housing 22 can also be integrated. Specifically, the end cap assembly 21 and the housing 22 can first form a common connection surface before other components are inserted into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap assembly 21 is then covered on the housing 22. The housing 22 can be of various shapes and sizes, such as rectangular parallelepiped shape, cylindrical shape, hexagonal prism shape, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this.

[0065] The electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 23 can be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0066] As Figure 4 and Figure 5 shown, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 22, an electrode assembly 23, and an end cap assembly 21. The electrode assembly 23 is disposed inside the housing 22; the end cap assembly 21 is covered on the housing 22 and is located above the electrode assembly 23. The end cap assembly 21 includes an end cap 212, a lower plastic 213, and a contact member 214. The lower plastic 213 is located on the side of the end cap 212 facing the electrode assembly 23, and the contact member 214 is located on the side of the lower plastic 213 facing the electrode assembly 23 and protrudes relative to the lower plastic 213, and at least a part of the contact member 214 is in contact with the electrode assembly 23.

[0067] The lower plastic 213 is provided between the electrode assembly 23 and the end cap assembly 21 to prevent the electrode assembly 23 from moving around and to play an insulating role. The contact member 214 can be prepared from a material with a buffering effect, and the contact member 214 is disposed at a position on the lower plastic 213 where welding slag is likely to be generated.

[0068] Exemplarily, when the battery cell 20 is a battery cell 20 with an M6T structure, the M6T structure refers to the structure of the battery 100 where the electrode tabs are led out from both sides. The pole column at the end cap 212 of the battery cell 20 and the corresponding adapter plate 215 are laser welded by rivets, so welding slag is likely to be generated during the welding process. In other words, welding slag can be generated on the side of the lower plastic 213 facing the electrode assembly 23. Since the contact member 214 is located on the side of the lower plastic 213 facing the electrode assembly 23 and protrudes relative to the lower plastic 213, after the end cap assembly 21 and the housing 22 are covered, the contact member 214 comes into contact with the electrode assembly 23 prior to the lower plastic 213. When welding slag is generated, the welding slag can penetrate into the contact member 214, that is, the contact member 214 can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23.

[0069] In summary, in the direction perpendicular to the end cap 212, the length by which the abutting member 214 protrudes relative to the lower plastic 213 can be greater than the length of the generated welding slag. The abutting member 214 can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23, thereby protecting the electrode assembly 23.

[0070] As Figure 5 shown, in some embodiments, the end cap assembly 21 further includes a positive terminal 2111 and a negative terminal 2112. The positive terminal 2111 and the negative terminal 2112 are spaced apart on the end cap 212. A lower plastic 213 is provided on one side of each of the positive terminal 2111 and the negative terminal 2112 facing the electrode assembly 23, and an abutting member 214 is provided on each lower plastic 213.

[0071] In other words, the end cap assembly 21 may include two lower plastics 213. For ease of distinction, the two lower plastics 213 may be named the first lower plastic 213 part and the second lower plastic 213 part, and the two abutting members 214 may be named the first abutting member 214 and the second abutting member 214. In the direction perpendicular to the end cap 212, the positive terminal 2111, the first lower plastic 213, and the first abutting member 214 are arranged in sequence, and the negative terminal 2112, the second lower plastic 213, and the second abutting member 214 are also arranged in sequence.

[0072] Because the number of welding operations near each electrode terminal 211 is relatively large and the probability of generating welding slag is relatively high, an abutting member 214 is provided on the lower plastic 213 corresponding to each electrode terminal 211. While using the abutting member 214 to block the welding slag to protect the electrode assembly 23, the number of lower plastics 213 provided can be reduced, thereby reducing the weight of the end cap assembly 21.

[0073] Please continue to refer to Figure 5 , in some embodiments, the end cap assembly 21 further includes a connecting piece 215. The connecting piece 215 is located on the side of the two lower plastics 213 facing away from the electrode assembly 23 and is respectively connected to the corresponding positive terminal 2111 and negative terminal 2112. Each connecting piece 215 is disposed close to the abutting member 214.

[0074] The connecting piece 215 is used to export or import the electrical energy of the electrode assembly 23. The side of the connecting piece 215 away from the electrode terminal 211 can be welded to the tab of the electrode assembly 23 to achieve electrical connection between the two.

[0075] Exemplarily, the battery cell 20 includes two connecting pieces 215, namely a first connecting piece 215 and a second connecting piece 215. One end of the first connecting piece 215 is connected to the positive terminal 2111, and the other end is connected to the positive tab of the electrode assembly 23. One end of the second connecting piece 215 is connected to the negative terminal 2112, and the other end is connected to the negative tab of the electrode assembly 23.

[0076] Since slag will be generated around the adapter piece 215 during the welding of the adapter piece 215, a contact piece 214 is arranged near the adapter piece 215, and the position of the contact piece 214 can be accurately set to better exert the function of the contact piece 214.

[0077] Specifically, as Figure 6 shown, in some embodiments, one side of the lower plastic 213 facing the electrode assembly 23 includes a first installation area 2131 and a second installation area 2132 that are spaced apart. The first installation area 2131 is provided with an adapter piece 215, and at least a part of the second installation area 2132 is provided with a contact piece 214.

[0078] Exemplarily, along the first direction X, a first installation area 2131 and a second installation area 2132 that are spaced apart are arranged on one side of the lower plastic 213 facing the electrode assembly 23. Since the first installation area 2131 is provided with an adapter piece 215, the first installation area 2131 can also be understood as a slag generation area. Along the first direction X, the second installation area 2132 can be entirely provided with contact pieces 214, or only part of the second installation part is provided with contact pieces 214.

[0079] In this way, the installation position of the contact piece 214 can be accurately set, and the range of the second installation area 2132 covered by the contact piece 214 can be adjusted according to the actual situation, so as to control the weight of the end cover assembly 21 within a preset range without affecting the use effect of the contact piece 214.

[0080] Of course, in some embodiments, along the first direction X, a first installation area 2131 and a second installation area 2132 that are sequentially connected are arranged on one side of the lower plastic 213 facing the electrode assembly 23. The first installation area 2131 is provided with an adapter piece 215, and the second installation area 2132 is provided with a contact piece 214. However, the area where slag is generated on the adapter piece 215 is spaced apart from the contact piece 214, and the generation range of the slag is generally within a circular ring with the electrode terminal 211 as the center and a radius between 6 mm and 8 mm.

[0081] More specifically, as Figure 5 and Figure 6 shown, in the direction perpendicular to the end cover 212, the orthographic projection of the contact piece 214 falls within the orthographic projection of the second installation area 2132.

[0082] In this way, the size of the contact piece 214 can be adjusted according to the specific situation of the current end cover assembly 21, and the use range of the contact piece 214 can be expanded. In the direction perpendicular to the end cover 212, making the orthographic projection of the contact piece 214 fall within the orthographic projection of the second installation area 2132 can reduce the probability that the contact piece 214 interferes with the remaining components in the housing 22 and causes damage to the contact piece 214, and can protect the contact piece 214.

[0083] Please refer to Figure 6 , in some embodiments, the abutting member 214 protrudes from the lower plastic 213 in the third direction. The third direction is parallel to the direction perpendicular to the end cap 212, and along the first direction X, the length by which the abutting member 214 protrudes from the lower plastic 213 is a, where a is less than or equal to 50 mm. The first direction X is parallel to the arrangement direction of the first mounting area 2131 and the second mounting area 2132, and the third direction intersects the first direction X.

[0084] Among them, the value range of a can be 1 mm, 3 mm, 7 mm, 10 mm, 15 mm, 50 mm, and any value between two adjacent values.

[0085] Limiting the length of the abutting member 214 in the first direction X can reserve a position for the component mounted on the end cap 212 in the first direction X, and as much as possible limit the overall size of the abutting member 214, so as to control the weight of the abutting member 214, and then control the weight of the end cap assembly 21, reduce the phenomenon that the weight of the end cap assembly 21 is too heavy, and effectively protect the electrode assembly 23.

[0086] Please continue to refer to Figure 6 , in some embodiments, along the second direction Y, the length by which the abutting member 214 protrudes from the lower plastic 213 is b, where b is less than or equal to 50 mm. The first direction X, the second direction Y, and the third direction intersect pairwise.

[0087] Among them, the value range of b can be 1 mm, 3 mm, 7 mm, 10 mm, 15 mm, 50 mm, and any value between two adjacent values.

[0088] Limiting the length of the abutting member 214 in the second direction Y can reserve a position for the component mounted on the end cap 212 in the second direction Y, and as much as possible limit the overall size of the abutting member 214, so as to control the weight of the abutting member 214, and then control the weight of the end cap assembly 21, reduce the phenomenon that the weight of the end cap assembly 21 is too heavy, and effectively protect the electrode assembly 23.

[0089] Please refer to Figure 5 , in some embodiments, the abutting member 214 protrudes from the lower plastic 213 in the third direction, and the length by which the abutting member 214 protrudes from the lower plastic 213 in the third direction is c, where c is greater than or equal to 0.1 mm and less than or equal to 3 mm. The third direction is parallel to the direction perpendicular to the end cap 212.

[0090] Among them, the value range of c can be 0.1 mm, 0.2 mm, 1 mm, 3 mm, and any value between two adjacent values.

[0091] The length of the abutment 214 in the third direction is limited to limit the overall size of the abutment 214 as much as possible, so as to control the weight of the abutment 214 and further control the weight of the end cover assembly 21, thereby reducing the phenomenon of excessive weight of the end cover assembly 21 and effectively protecting the electrode assembly 23.

[0092] In addition, without affecting the use effect of the abutment 214, the probability of the abutment 214 squeezing the electrode assembly 23 and causing damage to the electrode assembly 23 due to the excessive protrusion of the abutment 214 relative to the end cover 212 in the third direction can be reduced.

[0093] See also Figure 5 In some embodiments, the lower plastic 213 is recessed inwardly away from the electrode assembly 23 to form a groove, and at least a portion of the abutment member 214 is located in the groove.

[0094] The shape of the groove matches the shape of the abutment 214 in the lower plastic 213 to increase the contact area between the groove and the abutment 214, thereby improving the connection stability between the lower plastic 213 and the abutment 214. The assembly method between the abutment 214 and the groove can be but is not limited to bonding or clamping.

[0095] For example, the abutment member 214 can be divided into a first portion 11 and a second portion 12 connected to each other, wherein the first portion 11 is located in the groove and the second portion 12 is located outside the groove. The shape of the first portion 11 and the shape of the second portion 12 can be the same or different. For example, in one example, the first portion 11 can be a cuboid and the second portion 12 can be a cube. In another example, the first portion 11 and the second portion 12 are both cuboids.

[0096] In this way, not only the connection stability between the abutting piece 214 and the lower plastic 213 is improved, but also the shape of the abutting piece 214 is enriched, and the difficulty of manufacturing the abutting piece 214 is reduced.

[0097] In other embodiments, the lower plastic 213 and the abutting member 214 may also be manufactured by an integral molding process.

[0098] When no groove is formed on the lower plastic 213, the abutment 214 is directly installed on the surface of the lower plastic 213. The connection method between the lower plastic 213 and the abutment 214 can be the same as the method of assembling the abutment 214 in the groove when the groove is formed on the lower plastic 213, which will not be repeated here.

[0099] Some embodiments of the present application further provide a battery 100 , which includes the battery cell 20 in the above embodiment.

[0100] Since the abutting member 214 in the battery 100 is located on the side of the lower plastic 213 facing the electrode assembly 23 and protrudes relative to the lower plastic 213, after the end cover assembly 21 and the housing 22 are closed, the abutting member 214 contacts the electrode assembly 23 prior to the lower plastic 213. When welding slag is generated, the welding slag can extend into the abutting member 214, that is, the abutting member 214 can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23.

[0101] In this way, in the direction perpendicular to the end cover 212, the length by which the abutting member 214 protrudes relative to the lower plastic 213 can be greater than the length of the generated welding slag. The abutting member 214 can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23, thereby protecting the electrode assembly 23.

[0102] Some embodiments of the present application also provide an electrical device, which includes the battery 100 in the above embodiments, and the battery 100 is used to provide electrical energy.

[0103] Since the abutting member 214 in the electrical device is located on the side of the lower plastic 213 facing the electrode assembly 23 and protrudes relative to the lower plastic 213, after the end cover assembly 21 and the housing 22 are closed, the abutting member 214 contacts the electrode assembly 23 prior to the lower plastic 213. When welding slag is generated, the welding slag can extend into the abutting member 214, that is, the abutting member 214 can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23.

[0104] In this way, in the direction perpendicular to the end cover 212, the length by which the abutting member 214 protrudes relative to the lower plastic 213 can be greater than the length of the generated welding slag. The abutting member 214 can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23, thereby protecting the electrode assembly 23.

[0105] Specifically, in one embodiment, as Figure 5 shown, the battery cell 20 includes a housing 22, an electrode assembly 23, and an end cover assembly 21. The housing 22 is provided with an electrode assembly 23 therein, and the end cover assembly 21 includes an end cover 212, a lower plastic 213, and an abutting member 214. The lower plastic 213 is provided on the side of the end cover 212 facing the electrode assembly 23, and the abutting member 214 is provided on the side of the lower plastic 213 facing the abutting member 214.

[0106] After the end cover assembly 21 and the housing 22 are covered, the abutting member 214 contacts the electrode assembly 23 prior to the lower plastic 213. When welding slag is generated, the welding slag can extend into the abutting member 214, that is, the abutting member 214 can wrap around the outside of the welding slag to reduce the sharpness of the welding slag, thereby preventing the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23.

[0107] In this way, in the direction perpendicular to the end cover 212, the length by which the abutting member 214 protrudes relative to the lower plastic 213 can be greater than the length of the generated welding slag. The abutting member 214 can wrap around the outside of the welding slag to prevent the welding slag from directly contacting the electrode assembly 23 and piercing the electrode assembly 23, thereby protecting the electrode assembly 23.

[0108] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0109] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery cell, characterized in that: include: case; An electrode assembly, disposed inside the housing; An end cap assembly is covered on the shell and is located above the electrode assembly. The end cap assembly includes an end cap, a lower plastic and a contact piece. The lower plastic is located on the side of the end cap facing the electrode assembly. The contact piece is located on the side of the lower plastic facing the electrode assembly and is protruded relative to the lower plastic. At least part of the contact piece is in contact with the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The end cap assembly further includes a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are spaced apart on the end cap, and a lower plastic is respectively provided on one side of the positive terminal and the negative terminal facing the electrode assembly, and each lower plastic is provided with the abutment member.

3. The battery cell according to claim 2, characterized in that: The end cap assembly further includes a transfer plate, which is located on one side of the two lower plastics away from the electrode assembly and is respectively connected to the corresponding positive terminal and the negative terminal, and each transfer plate is arranged close to the abutment member.

4. The battery cell according to claim 3, characterized in that: The side of the lower plastic facing the electrode assembly includes a first installation area and a second installation area that are spaced apart from each other. The first installation area is provided with the adapter sheet, and at least part of the second installation area is provided with the abutment member.

5. The battery cell according to claim 4, characterized in that: In a direction perpendicular to the end cover, an orthographic projection of the abutment member falls within an orthographic projection of the second mounting area.

6. The battery cell according to claim 5, characterized in that: The abutment member is arranged relative to the lower plastic protrusion along a third direction, the third direction is parallel to the direction perpendicular to the end cover, and along the first direction, the length of the abutment member relative to the lower plastic protrusion is a, a is less than or equal to 50 mm, the first direction is parallel to the arrangement direction of the first installation area and the second installation area, and the third direction intersects with the first direction.

7. The battery cell according to claim 6, characterized in that: Along the second direction, the length of the abutment piece protruding relative to the lower plastic is b, and b is less than or equal to 50 mm. The first direction, the second direction and the third direction intersect each other.

8. The battery cell according to claim 1, characterized in that: The lower plastic is recessed inwardly in a direction away from the electrode assembly to form a groove, and at least a portion of the abutment member is located in the groove.

9. The battery cell according to claim 1, characterized in that: The abutment piece is protruded relative to the lower plastic along a third direction, and the length of the abutment piece protruding relative to the lower plastic along the third direction is c, c is greater than or equal to 0.1 mm and less than or equal to 3 mm, and the third direction is parallel to a direction perpendicular to the end cover.

10. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery of claim 10, the battery is used to provide electrical energy.

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