Battery monomer, battery device and electric device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device, a shell in the battery monomer defines a containing cavity, the shell comprises a wall part, an electrode terminal is arranged on the wall part, an electrode assembly is contained in the containing cavity, the electrode assembly comprises an electrode main body and a tab extending out of the electrode main body, and an adapter piece is contained in the containing cavity and located between the wall part and the electrode assembly. The surface, facing the electrode assembly, of the switching piece is provided with a concave part sunken towards the wall part, and at least part of the tabs are located in the concave part and connected to the bottom face of the concave part. The surface, facing the electrode assembly, of the adapter plate is provided with the concave part which is concave towards the wall part, the tab is connected to the bottom surface of the first concave part, and at least part of the tab can be positioned in the concave part, so that the tab has enough setting space, the electrode main body can be closer to the adapter plate, a gap between the electrode main body and the adapter plate is reduced, and the battery capacity is improved. Therefore, the electrode main body can occupy a larger space in the accommodating cavity, the capacity of the battery monomer is increased, and the capacity of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, how to improve the capacity of battery devices is attracting increasing attention from those skilled in the art. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell has a large capacity, which is beneficial to improving the capacity of the battery device.

[0005] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, electrode terminals, an electrode assembly, and an adapter piece. The housing forms a cavity and includes a wall portion. The electrode terminals are disposed in the wall portion. The electrode assembly is housed in the cavity and includes an electrode body and tabs extending from the electrode body. The adapter piece is housed in the cavity and located between the wall portion and the electrode assembly. The adapter piece is connected to the electrode terminals. The surface of the adapter piece facing the electrode assembly has a first recess that is recessed into the wall portion. At least a portion of the tabs is located in the first recess and connected to the bottom surface of the first recess.

[0006] In the above structure, since the surface of the adapter plate facing the electrode assembly has a recessed portion that is recessed into the wall, and the tab is connected to the bottom surface of the first recess, at least part of the tab can be located in the recess. This allows the tab to have sufficient space while the electrode body can be closer to the adapter plate, reducing the gap between the electrode body and the adapter plate. This allows the electrode body to occupy a larger space in the cavity, increasing the capacity of the battery cell and thus improving the capacity of the battery device.

[0007] According to some embodiments of this application, the battery cell includes an adapter piece comprising a first part and a second part connected to each other. The first part is connected to an electrode terminal. The second part has a smaller dimension in the thickness direction of the wall than the first part in the thickness direction of the wall. The surface of the second part facing the wall is flush with the surface of the first part facing the wall. The surface of the second part away from the wall is recessed relative to the surface of the first part away from the wall to form a first recess, such that the surface of the second part away from the wall is recessed inward relative to the surface of the first part away from the wall to form the first recess, so as to accommodate at least a portion of the tab.

[0008] According to some embodiments of this application, the battery cell includes a first part and a second part connected to each other. The first part is connected to the electrode terminal, and the second part is bent relative to the first part toward the wall to form a first recess, so that the second part is further away from the electrode body relative to the first part, so that the second part can form a first recess that provides a space for the tab to be installed, so as to accommodate at least part of the tab.

[0009] According to some embodiments of this application, the battery cell has an insulating structure on the surface of the wall facing the cavity. The surface of the insulating structure facing away from the wall is recessed inward to form a second recess, with at least a portion of the second part extending into the second recess. By recessing the surface of the insulating structure facing away from the wall to form the second recess, and by recessing the surface of the insulating structure facing the electrode assembly to form the second recess, the second recess can form a space to accommodate the second part. This allows at least a portion of the second part to extend into the second recess, reducing the space occupied by the adapter piece between the insulating structure and the electrode body. This facilitates bringing the adapter piece closer to the insulating structure, allows the electrode body to occupy a larger space in the cavity, and ultimately increases the capacity of the battery cell.

[0010] According to some embodiments of the present application, a gap is formed between the adapter piece and the insulating structure in the battery cell. The dimension of the gap in the thickness direction of the wall portion is A, where A ≥ 0.1 mm. By setting the dimension A of the gap between the adapter piece and the insulating structure in the thickness direction of the wall portion to A ≥ 0.1 mm, the heat generated by the adapter piece is less likely to affect the insulating structure, which is beneficial to extending the life of the insulating structure, thereby extending the life of the battery cell.

[0011] According to some embodiments of the present application, the battery cell has a protrusion on the surface of the insulating structure away from the wall, and the protrusion abuts against the electrode body. By providing a protrusion on the surface of the insulating structure away from the wall, the protrusion holds the electrode body, pressing the electrode body tightly against the inner wall surface of the outer casing, so that the electrode assembly can be fixed in the cavity, reducing the possibility of the electrode assembly shaking in the cavity, and improving the reliability of the battery cell.

[0012] According to some embodiments of this application, the battery cell includes a first tab and a second tab with opposite polarities. The first tab and the second tab are spaced apart and both extend from the end of the electrode body toward the wall. The battery cell includes a bottom support plate, which is sandwiched between the electrode body and the wall of the outer casing. This allows the electrode body to be held by the bottom support plate and the protrusion, further improving the stability of the electrode assembly in the cavity and reducing the possibility of the electrode assembly shaking in the cavity, which is beneficial to improving the reliability of the battery cell.

[0013] According to some embodiments of this application, the battery cell includes a first terminal and a second terminal spaced apart and located on the same side of the electrode assembly. A first tab is electrically connected to the first terminal via an adapter, and a second tab is electrically connected to the second terminal via an adapter. By providing two spaced-apart first and second terminals on the same side of the electrode assembly, and electrically connecting the first and second tabs of opposite polarities to the first and second terminals respectively via two adapters, the battery cell can be electrically connected to an external electrical device or charging device via the first and second terminals located on the same side, so as to charge and discharge the battery cell.

[0014] According to some embodiments of this application, the battery cell includes a first connecting portion, a bent portion, and a second connecting portion. The bent portion is connected between the first connecting portion and the second connecting portion. The first connecting portion is connected to the electrode body. The second connecting portion is bent relative to the thickness direction of the wall and connected to the bottom surface of the first recess, so that the electrode can form a buffer structure, which can buffer the mutual misalignment between the adapter piece and the electrode body, and reduce the risk of the electrode breaking due to the mutual misalignment between the adapter piece and the electrode body.

[0015] According to some embodiments of the present application, the battery cell has a first portion with a protrusion extending toward the electrode terminal, and the protrusion is connected to the electrode terminal. By providing the protrusion protruding toward the electrode terminal on the first portion, the first portion can be easily connected to the electrode terminal via the protrusion. By connecting the protrusion to the electrode terminal, the adapter can be easily connected to the electrode terminal.

[0016] According to some embodiments of this application, the first part and the second part of the battery cell are integrally formed.

[0017] According to some embodiments of this application, the battery cell includes a cover and a housing, the housing forming a cavity with an opening, the cover closing the opening, and the cover including a wall portion.

[0018] Secondly, some embodiments of this application also provide a battery device, the battery comprising the battery cell provided by the aforementioned technical solution.

[0019] Thirdly, some embodiments of this application also provide an electrical device, which includes the battery provided by the aforementioned technical solution, and the battery is used to provide electrical energy.

[0020] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0021] Some embodiments of this application provide a battery cell including a housing, electrode terminals, an electrode assembly, and an adapter plate. The housing forms a cavity and includes a wall. The electrode terminals are disposed in the wall. The electrode assembly is housed in the cavity and includes an electrode body and tabs extending from the electrode body. The adapter plate is housed in the cavity and located between the wall and the electrode assembly. The surface of the adapter plate facing the electrode assembly has a recess that is recessed into the wall. At least a portion of the tabs is located in the recess and connected to the bottom surface of the recess. In the above structure, because the surface of the adapter plate facing the electrode assembly has a recess that is recessed into the wall, and the tabs are connected to the bottom surface of the first recess, at least a portion of the tabs can be located in the recess. This allows the tabs to have sufficient placement space while the electrode body can be closer to the adapter plate, reducing the gap between the electrode body and the adapter plate. This allows the electrode body to occupy a larger space in the cavity, increasing the capacity of the battery cell and thus improving the capacity of the battery device.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0025] Figure 2 A split view of a battery provided in some embodiments of this application;

[0026] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0027] Figure 4 This is a split view of a battery cell provided in some embodiments of this application;

[0028] Figure 5 This is a top view of a battery cell provided in some embodiments of this application;

[0029] Figure 6 This is a sectional view at point AA;

[0030] Figure 7This is a schematic diagram of the structure of the adapter piece in a battery cell provided in some embodiments of this application;

[0031] Figure 8 This is a schematic diagram of the structure of the adapter piece in a battery cell provided in some other embodiments of this application;

[0032] Figure 9 for Figure 6 Enlarged view of point C in the middle;

[0033] Figure 10 This is a bottom view of the insulation structure in a battery cell provided in some embodiments of this application;

[0034] Figure 11 for Figure 4 Enlarged view of point B in the middle.

[0035] In the attached image:

[0036] 1. Electrode body; 2. Electrode tab; 21. First electrode tab; 22. Second electrode tab; 23. First connecting part; 24. Bending part; 25. Second connecting part;

[0037] 3. Insulating structure; 31. Protrusion; 32. Second recess;

[0038] 10. Box; 101. First box; 102. Second box;

[0039] 20. Battery cell; 201. Electrode assembly; 202. Housing; 2021. Wall; 2022. Cover; 2023. Shell; 203. Cavity; 204. Electrode terminal; 2041. First terminal; 2042. Second terminal; 205. Adapter piece; 2051. First part; 20511. Protrusion; 2052. Second part; 2053. First recess; 206. Base plate; 1000. Vehicle; 100. Battery assembly; 200. Controller; 300. Motor. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0046] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0047] In this application, "multiple" means two or more (including two).

[0048] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0049] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cell assemblies to provide higher voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0050] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0051] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0052] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0053] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0054] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0055] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0056] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0057] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0058] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0059] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0060] As people pay increasing attention to issues such as the driving range of electric vehicles, how to improve the capacity of battery devices is attracting more and more attention from those skilled in the art. In the prior art, in order to draw out the current from the electrode assembly, the battery cell usually has an adapter piece that connects to the tabs and electrode terminals. Since the tabs in the electrode assembly require space to be set, there is a gap between the adapter piece and the electrode body of the electrode assembly, which is not conducive to improving the capacity of the battery cell.

[0061] To improve the capacity of a single battery cell, some embodiments of this application provide a battery cell including a housing, electrode terminals, an electrode assembly, and an adapter plate. The housing forms a cavity and includes a wall. The electrode terminals are disposed in the wall. The electrode assembly is housed in the cavity and includes an electrode body and tabs extending from the electrode body. The adapter plate is housed in the cavity and located between the wall and the electrode assembly. The surface of the adapter plate facing the electrode assembly has a recess that is recessed into the wall. At least a portion of the tabs is located in the recess and connected to the bottom surface of the recess. In the above structure, because the surface of the adapter plate facing the electrode assembly has a recess that is recessed into the wall, and the tabs are connected to the bottom surface of the first recess, at least a portion of the tabs can be located in the recess. This allows the tabs to have sufficient space while the electrode body can be closer to the adapter plate, reducing the gap between the electrode body and the adapter plate. This allows the electrode body to occupy more space in the cavity, increasing the capacity of the battery cell and thus improving the capacity of the battery device.

[0062] The battery cell described in this application is applicable to battery devices and electrical devices that use battery devices. This battery cell can be used, but is not limited to, in battery devices, and can also be used in electrical devices such as vehicles, aircraft, ships, electronic devices, and power tools.

[0063] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0064] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0065] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0066] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for the battery cells 20. There can be multiple battery cells 20 in the battery device 100, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 20 can be connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10.

[0068] The housing 10 may include a first housing 101 and a second housing 102, which overlap each other to define a placement space for accommodating the battery cell 20. The first housing 101 and the second housing 102 may have various shapes, such as cuboids or cylinders. The first housing 101 may be a hollow structure with one open side, and the second housing 102 may also be a hollow structure with one open side. When the open side of the second housing 102 overlaps the open side of the first housing 101, a housing 10 with a placement space is formed.

[0069] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0070] 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 to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0071] In some embodiments of this application, such as Figure 3 As shown, the battery cell 20 includes a housing 202 and an electrode assembly 201, with the electrode assembly 201 housed within the housing 202. The housing 202 can be a wall structure disposed on the outer periphery of the battery cell 20, which can form a cavity 203 for accommodating other components of the battery cell 20, such as the electrode assembly 201, and the electrolyte. As a component housed within the housing 202, the electrode assembly 201 is in contact with the electrolyte, and active ions (e.g., lithium ions) can be conducted between the electrode assembly 201 and the electrolyte.

[0072] Some embodiments of this application provide a single battery cell 20, such as Figures 4 to 6As shown, the battery cell 20 includes a housing 202, electrode terminals 204, an electrode assembly 201, and an adapter piece 205. The housing 202 forms a cavity 203 and includes a wall portion 2021. The electrode terminals 204 are disposed in the wall portion 2021. The electrode assembly 201 is accommodated in the cavity 203 and includes an electrode body 1 and a tab 2 extending from the electrode body 1. The adapter piece 205 is accommodated in the cavity 203 and located between the wall portion 2021 and the electrode assembly 201. The adapter piece 205 is connected to the electrode terminals 204. (Reference) Figure 7 The surface of the adapter piece 205 facing the electrode assembly 201 has a first recess 2053 that is recessed into the wall portion 2021, and at least part of the tab 2 is located in the first recess 2053 and connected to the bottom surface of the first recess 2053.

[0073] The outer casing 202 can be a wall structure disposed on the outer periphery of the battery cell 20, which can form a cavity 203 for accommodating other components of the battery cell 20 such as the electrode assembly 201 and the adapter plate 205, as well as the electrolyte, and can protect the other components of the battery cell 20 such as the electrode assembly 201 and the adapter plate 205. The wall portion 2021 can be a part of the wall structure in the outer casing 202, on which electrode terminals 204 can be disposed.

[0074] The electrode terminal 204, as a component disposed on the wall portion 2021, can not only be electrically connected to the electrode assembly 201 inside the housing 202, but also be used to electrically connect to an external electrical device or charging device for the battery cell 20, so that the battery cell 20 can be charged and discharged. The electrode terminal 204 may include, but is not limited to, a columnar structure, and those skilled in the art can configure it according to the actual situation.

[0075] For example, the wall portion 2021 is provided with an electrode lead-out hole that extends through its own thickness, and the electrode terminal 204 is electrically connected through the electrode assembly 201 inside the electrode lead-out hole housing 202.

[0076] The electrode assembly 201 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 20, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through. The positive electrode can be a positive electrode sheet, and the negative electrode can be a negative electrode sheet.

[0077] The electrode body 1 can be the main structure of the electrode assembly 201, with a positive electrode portion and a negative electrode portion containing active material located in the electrode body 1. The tab 2 can be a structure in the electrode assembly 201 used for electrical connection with the electrode terminal 204, and it extends from the end of the electrode body 1.

[0078] The adapter 205 can be a device for electrically connecting the tab 2 and the electrode terminal 204. The adapter 205 is connected between the tab 2 and the electrode terminal 204, so that the tab 2 and the electrode terminal 204 are electrically connected.

[0079] The first recess 2053 may be a recessed structure provided on the adapter piece 205. By providing a recessed structure that is recessed toward the wall portion 2021 on the surface of the adapter piece 205 toward the electrode assembly 201, the surface of the adapter piece 205 toward the electrode assembly 201 is recessed inward to form a space for accommodating at least a portion of the tab 2.

[0080] With the adapter plate 205 connected to the electrode terminal 204, by placing at least a portion of the tabs 2 in the first recess 2053 and connecting the tabs 2 to the bottom surface of the first recess 2053, not only can at least a portion of the tabs 2 be located in the space formed by the first recess 2053, but the tabs 2 can also be connected to the adapter plate 205, so that the adapter plate 205 electrically connects the tabs 2 and the electrode terminal 204.

[0081] For example, the first recess 2053 can be formed by removing material through machining such as milling on the adapter piece 205, or by stamping to form a recess on the adapter piece 205.

[0082] In the above structure, since the surface of the adapter piece 205 facing the electrode assembly 201 has a recess that is recessed into the wall portion 2021, and the tab 2 is connected to the bottom surface of the first recess 2053, at least part of the tab 2 can be located in the recess. This allows the tab 2 to have sufficient space while the electrode body 1 can be closer to the adapter piece 205, reducing the gap between the electrode body 1 and the adapter piece 205. This allows the electrode body 1 to occupy a larger space in the cavity 203, increasing the capacity of the battery cell 20 and improving the capacity of the battery device 100.

[0083] In some embodiments, reference Figure 7 The adapter piece 205 includes a first part 2051 and a second part 2052 that are connected to each other. The first part 2051 is connected to the electrode terminal 204. The second part 2052 has a smaller dimension in the thickness direction of the wall part 2021 than the first part 2051 in the thickness direction of the wall part 2021. The surface of the second part 2052 facing the wall part 2021 is flush with the surface of the first part 2051 facing the wall part 2021. The surface of the second part 2052 facing away from the wall part 2021 is recessed relative to the surface of the first part 2051 facing away from the wall part 2021 to form a first recess 2053.

[0084] The first part 2051 and the second part 2052 can be two different parts of the adapter piece 205. The first part 2051 and the second part 2052 are connected to each other to form the adapter piece 205. The first part 2051 is connected to the electrode terminal 204, and the second part 2052 is connected to the tab 2.

[0085] By making the dimension of the second part 2052 in the thickness direction of the wall part 2021 smaller than the dimension of the first part 2051 in the thickness direction of the wall part 2021, and by making the surface of the second part 2052 facing the wall part 2021 flush with the surface of the first part 2051 facing the wall part 2021, the surface of the second part 2052 away from the wall part 2021 is recessed inward relative to the surface of the first part 2051 away from the wall part 2021 to form a first recess 2053, so as to accommodate at least a portion of the tab 2.

[0086] For example, the first part 2051 and the second part 2052 are integrally formed structures. The first part 2051 and the second part 2052 can be manufactured by integral forming processing methods such as casting and stamping, so that the adapter piece 205 can be manufactured as a whole and synchronously. This not only makes the processing and manufacturing of the adapter piece 205 convenient, but also gives the overall structure of the adapter piece 205 good strength. Alternatively, it can be formed by machining methods such as milling, by thinning a portion of the whole blank, so that the adapter piece 205 has a lower processing cost.

[0087] Since the dimension of the second part 2052 in the thickness direction of the wall part 2021 is smaller than that of the first part 2051 in the thickness direction of the wall part 2021, the flow area of ​​the second part 2052 can be maintained by increasing the width of the second part 2052, so as to reduce the impact of the thinning of the second part 2052 on the flow capacity of the adapter piece 205.

[0088] In some embodiments, reference Figure 8 The adapter piece 205 includes a first part 2051 and a second part 2052 that are connected to each other. The first part 2051 is connected to the electrode terminal 204, and the second part 2052 is bent relative to the first part 2051 toward the wall part 2021 to form a first recess 2053.

[0089] The first part 2051 and the second part 2052 can be two different parts of the adapter piece 205. The first part 2051 and the second part 2052 are connected to each other to form the adapter piece 205. The first part 2051 is connected to the electrode terminal 204, and the second part 2052 forms the first recess 2053.

[0090] The second part 2052 bends relative to the first part 2051 toward the wall part 2021 to form the first recess 2053. This means that the second part 2052 bends relative to the first part 2051 toward the wall part 2021, so that the second part 2052 is further away from the first part 2051 from the electrode body 1, so that the second part 2052 can form the first recess 2053 that provides a space for the electrode tab 2 to accommodate at least part of the electrode tab 2.

[0091] For example, the first part 2051 and the second part 2052 are integrally formed structures. The first part 2051 and the second part 2052 can be manufactured by integral forming processing methods such as casting and stamping, so that the adapter piece 205 can be manufactured as a whole and synchronously. This not only makes the processing and manufacturing of the adapter piece 205 convenient, but also gives the overall structure of the adapter piece 205 good strength. The first part 2051 and the second part 2052 can be manufactured by bending the whole blank, so that the adapter piece 205 has low processing difficulty and low processing cost.

[0092] In some embodiments, reference Figure 9 and Figure 10 An insulating structure 3 is provided on the surface of the wall portion 2021 facing the cavity 203. The insulating structure 3 is recessed inward from the surface of the wall portion 2021 to form a second recess 32. At least a portion of the second portion 2052 extends into the second recess 32.

[0093] The insulating structure 3 can be a structure used to insulate the wall portion 2021 from the devices or substances in the cavity 203. The insulating structure 3 is provided on the surface of the wall portion 2021 facing the cavity 203, so that the devices or substances in the cavity 203 are not easily in direct contact with the wall portion 2021, thereby achieving insulation isolation between the wall portion 2021 and the devices or substances in the cavity 203.

[0094] For example, the insulating structure 3 can be formed on the surface of the wall portion 2021 facing the cavity 203 by injection molding. This not only makes the connection of the insulating structure 3 on the wall portion 2021 firm, but also makes it less likely that the insulating structure 3 will be omitted from the surface of the wall portion 2021 facing the cavity 203, which is beneficial to improving the insulation and isolation effect of the insulating structure 3.

[0095] By recessing the surface of the insulating structure 3 away from the wall portion 2021 inward to form a second recess 32, the surface of the insulating structure 3 facing the electrode assembly 201 is recessed inward to form a second recess 32. This allows the second recess 32 to form a space to accommodate the second portion 2052, so that at least a portion of the second portion 2052 can extend into the second recess 32. This reduces the space occupied by the adapter piece 205 in the gap between the insulating structure 3 and the electrode body 1, which is beneficial for the adapter piece 205 to be closer to the insulating structure 3, and for the electrode body 1 to occupy a larger space in the cavity 203, thereby increasing the capacity of the battery cell 20.

[0096] In some embodiments, a gap is formed between the adapter piece 205 and the insulating structure 3, and the dimension of the gap in the thickness direction of the wall portion 2021 is A, where A ≥ 0.1 mm.

[0097] The gap can be a void formed between the adapter piece 205 and the insulating structure 3 in the thickness direction of the wall portion 2021. By forming a gap between the adapter piece 205 and the insulating structure 3, the adapter piece 205 does not directly contact the insulating structure 3, reducing the impact of the heat generated by the adapter piece 205 on the insulating structure 3, which is beneficial to extending the life of the insulating structure 3, and thus beneficial to extending the life of the battery cell 20.

[0098] By setting the dimension A of the gap between the adapter piece 205 and the insulating structure 3 in the thickness direction of the wall portion 2021 to A≥0.1mm, the heat generated by the adapter piece 205 is less likely to affect the insulating structure 3, which is beneficial to extending the life of the insulating structure 3, thereby extending the life of the battery cell 20.

[0099] In some embodiments, by setting the size A of the gap between the adapter piece 205 and the insulating structure 3 in the thickness direction of the wall portion 2021 to be A≥0.2mm, for example, by setting the size A of the gap between the adapter piece 205 and the insulating structure 3 in the thickness direction of the wall portion 2021 to be 0.25mm, 0.3mm or 0.35mm, the heat generated by the adapter piece 205 is less likely to affect the insulating structure 3, which is beneficial to extending the life of the insulating structure 3, thereby benefiting the extension of the life of the battery cell 20.

[0100] In some embodiments, the surface of the insulating structure 3 facing away from the wall portion 2021 is provided with a protrusion 31, which abuts against the electrode body 1.

[0101] The protrusion 31 can be a structure in which the surface of the insulating structure 3 facing away from the wall portion 2021 protrudes into the cavity 203, and it is used to support the electrode body 1.

[0102] By providing a protrusion 31 on the surface of the insulating structure 3 away from the wall portion 2021, the protrusion 31 presses against the electrode body 1, thereby pressing the electrode body 1 against the inner wall surface of the outer casing 202. This allows the electrode assembly 201 to be fixed in the cavity 203, reducing the possibility of the electrode assembly 201 shaking in the cavity 203 and improving the reliability of the battery cell 20.

[0103] In some embodiments, the tab 2 includes a first tab 21 and a second tab 22 with opposite polarities. The first tab 21 and the second tab 22 are spaced apart and both extend from the end of the electrode body 1 toward the wall portion 2021. The battery cell 20 includes a bottom support plate 206, which is sandwiched between the electrode body 1 and the wall of the outer casing 202.

[0104] The first tab 21 and the second tab 22 are two tabs 2 arranged at intervals and with opposite polarities. By making the first tab 21 and the second tab 22 both extend from the end of the electrode body 1 toward the wall portion 2021, the first tab 21 and the second tab 22 extend from the same side of the electrode body 1. This allows the space for setting the first tab 21 and the space for setting the second tab 22 to be reused, which can reduce the space occupied by the tabs 2. This is beneficial for the electrode body 1 to occupy a larger space in the cavity 203, and is beneficial for increasing the capacity of the battery cell 20.

[0105] The base plate 206 can be a component used to support the battery cell 20. By providing the base plate 206 in the cavity 203 and clamping the base plate 206 between the electrode body 1 and the wall of the outer casing 202, the electrode body 1 can be held by the base plate 206 and the protrusion 31, which further improves the stability of the electrode assembly 201 in the cavity 203, reduces the possibility of the electrode assembly 201 shaking in the cavity 203, and helps to improve the reliability of the battery cell 20.

[0106] In some embodiments, the electrode terminal 204 includes a first terminal 2041 and a second terminal 2042 that are spaced apart and located on the same side of the electrode assembly 201. The first tab 21 is electrically connected to the first terminal 2041 via an adapter piece 205, and the second tab 22 is electrically connected to the second terminal 2042 via the adapter piece 205.

[0107] By providing two spaced-apart first terminals 2041 and second terminals 2042 on the same side of the electrode assembly 201, and electrically connecting first tabs 21 and second tabs 22 of opposite polarities to the first terminals 2041 and second terminals 2042 respectively via two rotating tabs, the battery cell 20 can be electrically connected to an external electrical device or charging device through the first terminals 2041 and second terminals 2042 located on the same side, so as to charge and discharge the battery cell 20.

[0108] In some embodiments, reference Figure 11 The electrode tab 2 includes a first connecting part 23, a bending part 24, and a second connecting part 25. The second connecting part 25 is connected to the first connecting part 23 through the bending part 24. The first connecting part 23 is connected to the electrode body 1. The second connecting part 25 is bent relative to the thickness direction of the wall part 2021 and connected to the bottom surface of the first recess 2053.

[0109] The first connecting portion 23, the bending portion 24, and the second connecting portion 25 are different structural parts of the tab 2. The bending portion 24 can be a structure connected between the first connecting portion 23 and the second connecting portion 25 to make the first connecting portion 23 and the second connecting portion 25 bend relative to each other. The first connecting portion 23 can be a structural part of the tab 2 that is connected to the electrode body 1, and the second connecting portion 25 can be a structural part of the tab 2 that is connected to the bottom surface of the first recess 2053.

[0110] Under the action of the bending portion 24, the second connecting portion 25 bends relative to the thickness direction of the wall portion 2021, so that the tab 2 can form a buffer structure, which can buffer the mutual misalignment between the adapter piece 205 and the electrode body 1, reducing the risk of the tab 2 breaking due to the mutual misalignment between the adapter piece 205 and the electrode body 1.

[0111] In some embodiments, the first part 2051 is provided with a protrusion 20511 protruding toward the electrode terminal 204, and the protrusion 20511 is connected to the electrode terminal 204.

[0112] The protrusion 20511 can be a protruding structure that protrudes from the first part 2051 toward the electrode terminal 204. By providing the protrusion 20511 protruding toward the electrode terminal 204 on the first part 2051, the first part 2051 can be easily connected to the electrode terminal 204 via the protrusion 20511. By connecting the protrusion 20511 to the electrode terminal 204, the adapter piece 205 can be easily connected to the electrode terminal 204.

[0113] For example, the protrusion 20511 may be welded to the electrode terminal 204, and the tab 2 may be welded to the bottom surface of the first recess 2053.

[0114] In some embodiments, the housing 202 includes a cover 2022 and a housing 2023, the housing 2023 forming a cavity 203 with an opening, the cover 2022 covering the opening, and the cover 2022 including a wall portion 2021.

[0115] The shell 2023 and the cover 2022 are different structures in the outer shell 202. The shell 2023 can form a cavity 203 with an opening at least one end. The cover 2022 seals and closes to the opening and is connected to the shell 2023, so that the cavity 203 is a sealed space that can hold the electrode assembly 201, the adapter plate 205, the bottom plate 206 and the electrolyte.

[0116] By including the wall portion 2021 of the aforementioned technical solution in the cover 2022, the electrode terminal 204 can be disposed on the cover 2022. Since the cover 2022 is typically a plate-shaped structure, it is convenient to dispose of the electrode terminal 204 on the cover 2022.

[0117] Some embodiments of this application also provide a battery device 100, which includes the battery cell 20 provided by the above-described technical solution.

[0118] Some embodiments of this application also provide an electrical device, which includes the battery device 100 provided by the above-described technical solution, the battery device 100 being used to provide electrical energy.

[0119] Some embodiments of this application provide a battery cell 20, which includes a housing 202, a first terminal 2041, a second terminal 2042, an electrode assembly 201, a base plate 206, and an adapter plate 205. The housing 202 includes a cover 2022 and a shell 2023. The shell 2023 forms a cavity 203 with an opening. The cover 2022 covers the opening and includes a wall portion 2021. The first terminal 2041 and the second terminal 2042 are disposed on the wall portion 2021. The base plate 206, the electrode assembly 201, and the adapter plate 205 are located in the cavity 203. The first tab 21 and the second tab 22 in the electrode assembly 201 are respectively connected to the first terminal 2041 and the second terminal 2042 through the adapter plate 205. An insulating structure 3 is provided on the surface of the wall portion 2021 facing the cavity 203. The insulating structure 3 is recessed inward from the surface of the wall portion 2021 to form a second recess 32. The second part 2052 on the adapter piece 205 is bent relative to the first part 2051 towards the wall portion 2021 to form a first recess 2053. At least a portion of the second part 2052 extends into the second recess 32. At least a portion of the first electrode tab 21 and the second electrode tab 22 are located in the first recess 2053 and connected to the bottom surface of the first recess 2053.

[0120] In the above structure, since the surface of the adapter piece 205 facing the electrode assembly 201 has a recess that is recessed into the wall portion 2021, and the tab 2 is connected to the bottom surface of the first recess 2053, at least part of the tab 2 can be located in the recess. This allows the tab 2 to have sufficient space while the electrode body 1 can be closer to the adapter piece 205, reducing the gap between the electrode body 1 and the adapter piece 205. This allows the electrode body 1 to occupy a larger space in the cavity 203, increasing the capacity of the battery cell 20 and improving the capacity of the battery device 100.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell enclosing a cavity, the shell comprising a wall portion; an electrode terminal arranged on the wall portion; an electrode assembly accommodated in the cavity, the electrode assembly comprising an electrode body and a tab extending from the electrode body; a transition piece accommodated in the cavity and located between the wall portion and the electrode assembly, the transition piece being connected to the electrode terminal, a surface of the transition piece facing the electrode assembly having a first recess recessed towards the wall portion, at least part of the tab being located in the first recess and connected to a bottom surface of the first recess.

2. The battery cell of claim 1, wherein, The transition piece comprises a first portion and a second portion connected to each other, the first portion being connected to the electrode terminal, a dimension of the second portion in a thickness direction of the wall portion being smaller than a dimension of the first portion in the thickness direction of the wall portion, a surface of the second portion facing the wall portion being flush with a surface of the first portion facing the wall portion, a surface of the second portion facing away from the wall portion being recessed relative to a surface of the first portion facing away from the wall portion to form the first recess.

3. The battery cell of claim 1, wherein, The transition piece comprises a first portion and a second portion connected to each other, the first portion being connected to the electrode terminal, the second portion being bent relative to the first portion towards the wall portion to form the first recess.

4. The battery cell of claim 3, wherein, The wall portion is provided with an insulating structure on a surface thereof facing the cavity, a surface of the insulating structure facing away from the wall portion being recessed inwardly to form a second recess, at least part of the second portion extending into the second recess.

5. The battery cell of claim 4, wherein, A gap is formed between the transition piece and the insulating structure, a dimension of the gap in the thickness direction of the wall portion being A, A≥0.1mm.

6. The battery cell of claim 4, wherein, The insulating structure is provided with a protrusion protruding from a surface thereof facing away from the wall portion, the protrusion abutting against the electrode body.

7. The battery cell of claim 1, wherein, The tab comprises a first tab and a second tab having opposite polarities, the first tab and the second tab being arranged in a spaced manner and extending from an end portion of the electrode body towards the wall portion, the battery monomer comprising a bottom support plate clamped between the electrode body and the wall portion of the shell.

8. The battery cell of claim 7, wherein, The electrode terminal comprises a first terminal and a second terminal arranged in a spaced manner and located on a same side of the electrode assembly, the first tab being electrically connected to the first terminal through the transition piece, the second tab being electrically connected to the second terminal through the transition piece.

9. The battery cell of claim 1, wherein, The tab comprises a first connecting portion, a bent portion and a second connecting portion, the bent portion being connected between the first connecting portion and the second connecting portion, the first connecting portion being connected to the electrode body, the second connecting portion being bent relative to the thickness direction of the wall portion and connected to a bottom surface of the first recess.

10. The battery cell of any one of claims 2-6, wherein, The first portion is provided with a protrusion protruding towards the electrode terminal, the protrusion being connected to the electrode terminal.

11. The battery cell of any one of claims 2-6, wherein, The first portion and the second portion are integrally formed.

12. The battery cell of claim 1, wherein, The shell comprises a cover and a shell body, the shell body forming the cavity having an opening, the cover being arranged on the opening, the cover comprising the wall portion.

13. A battery device characterized by comprising: The battery device comprises the battery monomer as claimed in any one of claims 1 to 12.

14. An electrical device, comprising: The battery device as claimed in claim 13 is used for providing electric energy.

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