Battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery monomer, a battery device and electric equipment. The battery cell includes a case; an electrode assembly accommodated in the case; an electrode terminal provided in the case; the switching structure is electrically connected to the electrode assembly and the electrode terminal; wherein the switching structure and the electrode terminal are fixedly connected through a first connecting part and a second connecting part, the first connecting part and the second connecting part are distributed at an interval, and the second connecting part is arranged on the outer side of the first connecting part. According to the battery monomer, the battery device and the electric equipment provided by the embodiment of the invention, the connection strength between the electrode terminal and the switching structure can be improved, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery device, the connection of each component in the battery may affect the reliability of the battery device. Therefore, how to improve the connection strength of the components of the battery device to ensure the reliability of the battery is a technical problem to be solved in the battery technology. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a battery monomer, a battery device and an electric equipment, which can improve the connection strength between the electrode terminal and the adapter structure and improve the reliability of the battery monomer.

[0005] In a first aspect, a battery monomer is provided, comprising a shell; an electrode assembly contained in the shell; an electrode terminal arranged in the shell; and an adapter structure electrically connected to the electrode assembly and the electrode terminal; wherein the adapter structure and the electrode terminal are fixedly connected through a first connecting part and a second connecting part, the first connecting part and the second connecting part are spaced apart, and the second connecting part is arranged outside the first connecting part.

[0006] The battery monomer provided by the embodiments of the present application protects the first connecting part by arranging the second connecting part, reduces the tearing range of the electrode terminal and the adapter structure at the first connecting part under vibration of the battery monomer, reduces the failure probability of the first connecting part, improves the connection strength between the electrode terminal and the adapter structure, and further improves the reliability of the battery monomer. Therefore, the technical scheme of the embodiments of the present application can improve the connection strength between the electrode terminal and the adapter structure and improve the reliability of the battery monomer.

[0007] In some embodiments, the second connecting part includes a plurality of disconnected welding tracks, and the plurality of disconnected welding tracks form a track around the first connecting part.

[0008] By arranging the plurality of disconnected welding tracks around the first connecting part, the vibration load is dispersed to the plurality of disconnected welding tracks of the second connecting part under vibration of the battery monomer, the risk of the vibration load being concentrated on a single welding track of the first connecting part and causing the failure probability of the first connecting part to increase is reduced, the connection strength between the electrode terminal and the adapter structure is improved, and the reliability of the battery monomer is improved.

[0009] In some embodiments, the plurality of disconnected welding tracks comprises a plurality of disconnected circular arc tracks forming a circular contour around the first connecting portion.

[0010] By setting the plurality of disconnected circular arc tracks to form a circular contour around the first connecting portion, in the case of battery cell vibration, the local stress overloading of the first connecting portion and the second connecting portion can be reduced, the failure probability of the first connecting portion can be reduced, and the connection strength between the electrode terminal and the adapter structure can be improved.

[0011] In some embodiments, the plurality of disconnected welding tracks comprises a plurality of disconnected straight line tracks forming a polygonal contour around the first connecting portion.

[0012] By setting the plurality of disconnected straight line tracks at the second connecting portion to form a polygonal contour around the first connecting portion, in the case of battery cell vibration, the plurality of disconnected straight line tracks can disperse the stress of the second connecting portion, reduce the stress concentration phenomenon of the second connecting portion, and be beneficial to reduce the failure probability of the first connecting portion and improve the connection strength between the electrode terminal and the adapter structure.

[0013] In some embodiments, the second connecting portion is a non-closed circular track or a polygonal track.

[0014] By setting the non-closed circular track or the polygonal track, the track of the second connecting portion is adapted to the adapter structure, in the case of battery cell vibration, the vibration load can be dispersed to the circular track or the polygonal track segment of the second connecting portion, the failure probability of the first connecting portion can be reduced, and the connection strength between the electrode terminal and the adapter structure can be improved.

[0015] In some embodiments, the minimum distance L between the first connecting portion and the second connecting portion satisfies: 0.1mm~20mm.

[0016] Setting a suitable minimum distance between the first connecting portion and the second connecting portion is beneficial to improve the connection strength between the electrode terminal and the electrode assembly. In the case where the minimum distance L is greater than or equal to 0.1mm, there is a certain distance between the first connecting portion and the second connecting portion, which can reduce the heat accumulation and local overheating of the first connecting portion and the second connecting portion during welding, and prevent the phenomenon that the electrode terminal and the adapter structure cannot be fixedly connected through the first connecting portion and the second connecting portion. In the case where the minimum distance L is less than or equal to 20mm, the distance between the second connecting portion and the first connecting portion is reduced, and in the case of battery cell vibration, the second connecting portion cannot disperse the vibration load, and the failure probability of the first connecting portion is increased.

[0017] In some embodiments, the minimum distance L1 between the multiple segments of disconnected circular arc tracks satisfies: 0.1mm-15mm.

[0018] By setting the multiple segments of disconnected circular arc tracks with a suitable minimum distance, the stress concentration problem of the first connecting part can be reduced, and the connection strength between the electrode terminal and the adapter structure can be improved. In the case where the minimum distance L1 between the multiple segments of disconnected circular arc tracks is greater than or equal to 0.1mm, the stress of the second connecting part can be dispersed under the vibration of the battery monomer, the circular arc tracks of the second connecting part are prevented from being connected to each other, and the failure probability of the first connecting part is reduced. In the case where the minimum distance L1 between the multiple segments of disconnected circular arc tracks is less than or equal to 15mm, the distance between the welding tracks of the second connecting part is reduced, the vibration load cannot be dispersed under the vibration of the battery monomer, and the failure probability of the first connecting part is increased. In this case, the connection strength between the electrode terminal and the adapter structure can be improved.

[0019] In some embodiments, the minimum distance L2 between the multiple segments of disconnected straight line tracks satisfies: 0.1mm-15mm.

[0020] By setting the minimum distance L2 between the multiple segments of disconnected straight line tracks to satisfy the above range, the failure probability of the first connecting part can be reduced, and the connection strength between the electrode terminal and the adapter structure can be improved. In the case where the minimum distance L2 between the multiple segments of disconnected straight line tracks is greater than or equal to 0.1mm, the stress of the second connecting part can be dispersed under the vibration of the battery monomer, and the failure probability of the first connecting part is reduced. In the case where the minimum distance L2 between the multiple segments of disconnected straight line tracks is less than or equal to 15mm, the distance between the welding tracks of the second connecting part is reduced, the vibration load cannot be dispersed under the vibration of the battery monomer, and the failure probability of the first connecting part is increased. In this case, the connection strength between the electrode terminal and the adapter structure can be improved.

[0021] In some embodiments, the welding mode of the welding track includes at least one of the following: laser welding, stick arc welding, submerged arc welding, argon arc welding, gas welding, friction welding, ultrasonic welding, hot melt welding, or hot pressure welding. In this way, different welding modes can be selected according to actual use requirements, and the connection strength between the electrode terminal and the adapter structure can be improved.

[0022] In some embodiments, the first connecting portion is a continuous spiral track. In this way, the first connecting portion has a continuous connecting path, which facilitates the first connecting portion and the second connecting portion being arranged apart from each other and outside the first connecting portion, thereby facilitating the second connecting portion protecting the first connecting portion, reducing the extent of the electrode terminal and the adapter structure tearing at the first connecting portion in a vibration condition, reducing the failure probability of the first connecting portion, and improving the connecting strength between the electrode terminal and the adapter structure. In some embodiments, the first connecting portion and the second connecting portion are arranged at a first wall of the electrode terminal close to the adapter structure, the first wall including a main body region and an extension region arranged around the main body region, the extension region extending away from the main body region; the first connecting portion is located at the main body region, and the second connecting portion is located at the extension region.

[0023] By arranging the extension region extending away from the main body region, the position of the second connecting portion can be arranged more flexibly, which facilitates the first connecting portion and the second connecting portion being arranged apart from each other and outside the first connecting portion, and improves the connecting strength between the electrode terminal and the adapter structure.

[0024] In a second aspect, a battery device is provided, including the battery cell as in the first aspect.

[0025] In a third aspect, a use-electricity device is provided, including the battery device as in the second aspect, and the battery device is configured to provide electric energy for the use-electricity device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of a vehicle according to an embodiment of the present application;

[0027] Figure 2 A schematic diagram of an exploded structure of a battery according to an embodiment of the present application;

[0028] Figure 3 A schematic diagram of a structure of a battery cell according to an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a connection between an electrode terminal and an adapter structure according to an embodiment of the present application;

[0030] Figure 5 A schematic diagram of a connection between an electrode terminal and an adapter structure according to another embodiment of the present application;

[0031] Figure 6 A schematic diagram of a connection between an electrode terminal and an adapter structure according to still another embodiment of the present application;

[0032] Figure 7 A schematic diagram of a connection between an electrode terminal and an adapter structure according to still another embodiment of the present application;

[0033] Figure 8 Connection diagram of the electrode terminal and the adapter structure according to another embodiment of the present application;

[0034] Figure 9 Connection diagram of the electrode terminal and the adapter structure according to another embodiment of the present application;

[0035] Figure 10 Connection diagram of the electrode terminal and the adapter structure according to another embodiment of the present application;

[0036] Figure 11 Connection diagram of the electrode terminal and the adapter structure according to another embodiment of the present application.

[0037] In the drawings, the following signs are used:

[0038] Vehicle 1, controller 30, motor 40;

[0039] Battery device 10, case 11, first case portion 111, second case portion 112; battery cell 20, outer case 21, case body 211, end cover 212, electrode assembly 22, tab 221, positive electrode tab 221a, negative electrode tab 221b, adapter structure 23, pressure relief mechanism 213, electrode terminal 214, positive electrode terminal 214a, negative electrode terminal 214b;

[0040] First wall 31, first connection portion 311, second connection portion 312, main body region 3111, extension region 3121.

[0041] In the drawings, the drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0043] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0044] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0046] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one skilled in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application; the terms "include" and "have" in the specification and claims of the present application and their any variants are intended to cover the non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0047] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0048] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0049] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard.

[0050] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator, which is disposed between the positive electrode and the negative electrode, can prevent the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0051] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0052] As an example, the positive electrode current collector has two opposing surfaces in a thickness direction thereof, and the positive electrode active material is disposed on either or both of the two opposing surfaces of the positive electrode current collector.

[0053] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0054] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0055] As an example, the negative electrode current collector has two opposing surfaces in a thickness direction thereof, and the negative electrode active material is disposed on either or both of the two opposing surfaces of the negative electrode current collector.

[0056] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0057] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0058] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0059] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0060] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The type of the electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0061] In some embodiments, the electrolyte solution can further optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0062] The electrode assembly can be in a jelly-roll structure, a stack structure, or a hybrid structure of a jelly-roll and a stack.

[0063] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0064] In some embodiments, the electrode assembly is in a stack structure.

[0065] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0066] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0067] For example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0068] For example, a plurality of separators can be provided, and each of the separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0069] For example, a plurality of separators can be provided, and each of the separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0070] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0071] In some embodiments, the electrode assembly can be provided with a tab. The tab can be configured to guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0072] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., a polypropylene housing), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film, or the like. In some embodiments, the housing can be a sealed structure or a non-sealed structure. For example, when the housing is a non-sealed structure, the housing can be configured to protect the electrode assembly. The housing and the electrode assembly can further include a sealing bag configured to encapsulate the electrode assembly and the electrolyte. For example, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing can be configured to encapsulate the electrode assembly and the electrolyte.

[0073] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc., and the present application is not particularly limited.

[0074] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided on the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0075] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab, or indirectly connected with the tab through a current collecting member. The electrode terminal can be provided on the end cap, or provided on the shell.

[0076] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a current collecting member.

[0077] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0078] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0079] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0080] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0081] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0082] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0083] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery monomer assembly.

[0084] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0085] The technical solutions described in the embodiments of the present application are applicable to various electric equipment using battery monomers.

[0086] For example, the electric equipment can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric equipment.

[0087] For another example, the electric equipment can also be an energy storage device, which can include a plurality of battery devices. The energy storage device can be an energy storage container or an energy storage cabinet. The energy storage device can be a regular cuboid structure, in which six faces of the cuboid are six outer walls of the energy storage device. The energy storage device is arranged in a cuboid structure to facilitate the fixed placement and transportation of the energy storage device. Of course, the energy storage device can also have other shapes, for example, at least one wall of the energy storage device is arranged obliquely.

[0088] The energy storage device includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0089] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy during a low electricity consumption period and provide electric energy for relevant users or electric equipment during a high electricity consumption period. The energy storage system provided in the embodiments of the present application can be any power system that needs to use an energy storage device.

[0090] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0091] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0092] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0093] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery monomer to each battery device through a pipeline.

[0094] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0095] As an example, the general control module can serve as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current and voltage of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and an optical fiber conversion module, etc.

[0096] As an example, the fire-fighting system includes a control panel, a detector, an alarm device, etc. for detecting, alarming, or extinguishing the energy storage system.

[0097] As an example, the power distribution device can be used for power distribution to the power consumption module of the energy storage device.

[0098] The adapter structure inside the battery cell can connect the electrode terminal of the battery cell through the connecting part to realize the electrical connection between the electrode terminal and the adapter structure. Further, the adapter structure can be fixed to the electrode terminal of the battery cell by welding. The electrode terminal of the battery cell according to the embodiments of the present application can be used for electrical connection with the adapter structure to output electric energy. The battery cell generally includes a plurality of electrode terminals, which can include at least one positive electrode terminal and at least one negative electrode terminal, and the plurality of electrode terminals can be located on the same wall or on different walls.

[0099] When the electrical connection between the electrode terminal and the adapter structure is realized through the connecting part, the arrangement of the connecting part is a key factor affecting the electrical connection between the electrode terminal and the adapter structure. The connecting part can refer to a route or track for welding connection of the electrode terminal and the adapter structure along a predetermined path during fixed connection. For example, when the electrode terminal and the adapter structure are connected by welding, the electrical connection between the electrode terminal and the adapter structure is realized through a continuous welding track. The welding track can refer to a route or track for welding by the welding equipment along a predetermined path during welding. The welding track represents the path of the movement of the heat source during welding, which generally extends along the contact surface of the electrode terminal and the adapter structure to form a continuous welding seam to realize the electrical connection between the electrode terminal and the adapter structure.

[0100] In the case of vibration of the battery cell, a stress concentration area is usually formed in the continuous welding track, which may cause cracks in the connecting part under the action of continuous vibration load. The cracks expand under the repeated action of the vibration load, resulting in the overall failure of the connecting part, reducing the connection strength between the electrode terminal and the adapter structure, disconnecting the electrical connection between the electrode terminal and the adapter structure, and reducing the reliability of the battery cell.

[0101] Therefore, the technical scheme of the embodiments of the present application can improve the connection strength between the electrode terminal and the adapter structure and improve the reliability of the battery cell.

[0102] The technical schemes described in the embodiments of the present application are applicable to various battery-using electrical devices.

[0103] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0104] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0105] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0106] Figure 2 An exploded view of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0107] It should be understood that the battery device 10 of the embodiments of the present application can also include a box 11, which can be used to accommodate a plurality of battery cells 20. The box 11 of the embodiments of the present application is a hollow structure inside which the plurality of battery cells 20 are accommodated. The box 11 can include two parts, which are referred to as a first box part 111 and a second box part 112 herein, and the first box part 111 and the second box part 112 are fastened together. The shapes of the first box part 111 and the second box part 112 can be determined according to the shapes of the components accommodated inside, for example, according to the shape of the combination of the plurality of battery cells 20, and at least one of the first box part 111 and the second box part 112 has an opening. For example, as shown in Figure 2 FIG. 1, only one of the first box part 111 and the second box part 112 can be a hollow cuboid with an opening, and the other can be a plate-shaped structure to cover the opening. Here, the second box part 112 is taken as a hollow cuboid with an opening, and the first box part 111 is taken as a plate-shaped structure. Then, the first box part 111 is fastened to the opening of the second box part 112 to form a box 11 with a closed cavity, which can be used to accommodate the plurality of battery cells 20. The plurality of battery cells 20 are placed in the box 11 formed by fastening the first box part 111 and the second box part 112 after being combined in parallel, in series, or in a hybrid manner.

[0108] For another example, the first box part 111 and the second box part 112 can both be hollow cuboids, and each has a face as an opening face. The openings of the first box part 111 and the second box part 112 are oppositely arranged, and the first box part 111 and the second box part 112 are fastened to each other to form a box 11 with a closed cavity, which can be used to accommodate the plurality of battery cells 20.

[0109] The number of battery cells 20 can be set to any value according to different power requirements. The plurality of battery cells 20 can be connected in series, in parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 10 can be large, in order to facilitate installation, the battery cells 20 can be arranged in groups, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device can include a plurality of battery modules, and these battery modules can be connected in series, in parallel, or in a hybrid manner.

[0110] Figure 3 The structure of the battery cell 20 of an embodiment of the present application is shown in FIG. 2. As shown in Figure 3 FIG. 2, the battery cell 20 of the embodiments of the present application can include a shell 21, an electrode assembly 22, an electrode terminal 214, and a transition structure 23.

[0111] It should be understood that the shape of the battery cell 20 in this application embodiment can be flexibly set according to actual application. That is, the outer shell 21 of the battery cell 20 can be any polyhedral structure, such as a cuboid or a cylinder. For example, the external shape of the battery cell 20 can be the same as or different from the shape of the internal electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the outer shell 21 of the battery cell 20 can also be a cylindrical structure, or it can also be a cuboid structure; if the electrode assembly 22 is a cuboid structure, the outer shell 21 can usually also be a cuboid structure, but this application embodiment is not limited to this.

[0112] In this embodiment of the application, the battery cell 20 includes a housing 211. For example, the outer shell 21 may include the housing 211. Specifically, the housing 211 is a hollow structure with an opening, and the electrode assembly 22 is housed within the housing 211. The battery cell 20 may also include an end cap 212, which is used to cover the opening of the housing 211 to isolate it from the external environment.

[0113] The battery cell 20 in this embodiment may include one or more electrode terminals 214, which may be disposed on the same wall of the housing 21 or on different walls. Figure 3 Taking a battery cell 20 that includes two electrode terminals 214 as an example, and these two electrode terminals 214 are disposed on a flat end cap 212. The two electrode terminals 214 may include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0114] like Figure 3 As shown, the electrode assembly 22 may include multiple tabs 221, for example, the tabs 221 include a first tab 221a and a second tab 221b. The first tab 221a and the second tab 221b have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 221b is a negative tab.

[0115] In this embodiment, the adapter structure 23 is electrically connected to the tab 221 and the electrode terminal 214, enabling communication between the tab 221 and the electrode terminal 214, allowing current to flow into or out of the electrode assembly 22. One or more adapter structures 23 can be provided, and each adapter structure 23 can be positioned between the tab 221 and the electrode terminal 214. The first tab 221a of the electrode assembly 22 is connected to one electrode terminal via one adapter structure 23, and the second tab 221b of the electrode assembly 22 is connected to another electrode terminal via another adapter structure 23. For example, the positive electrode terminal 214a is connected to the positive tab via one adapter structure 23, and the negative electrode terminal 214b is connected to the negative tab via another adapter structure 23.

[0116] It should be understood that the tab 221 refers to a conductive member protruding from the electrode assembly 22 for discharging or charging the electrode assembly 22. The electrode terminal 214 refers to a conductive member provided on the case 21, and the electrode terminal 214 is connected to the tab 221 of the electrode assembly 22 to output or charge the battery cell 20. The adapter structure 23 refers to a conductive member provided in the battery cell 20, and the adapter structure 23 connects the tab 221 and the electrode terminal 214 to electrically connect the tab 221 and the electrode terminal 214.

[0117] In some embodiments, the case 21 can include a housing 211 provided with an opening and an end cap 212 provided on the opening, and the electrode terminal 214 is provided on the end cap 212.

[0118] In some embodiments, one or more electrode terminals 214 can be provided on the case 21, for example, as shown in FIG. 2, two electrode terminals 214, including a positive electrode terminal 214a and a negative electrode terminal 214b, can be provided on the case 21, and the positive electrode terminal 214a is electrically connected to the positive tab 221a, and the negative electrode terminal 214b is electrically connected to the negative tab 221b. Figure 3

[0119] In some embodiments, the adapter structure 23 can also be provided with multiple, for example, as shown in FIG. 3, two adapter structures 23 can be provided, one of the two adapter structures 23 is respectively connected to the positive electrode terminal 214a and the positive tab 221a, so that the current between the positive electrode terminal 214a and the positive tab 221a is conducted; the other of the two adapter structures 23 is respectively connected to the negative electrode terminal 214b and the negative tab 221b, so that the current between the negative electrode terminal 214b and the negative tab 221b is conducted. Figure 3

[0120] In some embodiments, the battery cell 20 can also include a case 21, an electrode terminal 214 provided on the case 21, an electrode assembly 22 provided with a tab 221, and an adapter structure 23 electrically connected to the electrode terminal 214 and the tab 221, respectively.

[0121] ​​It should be understood that the adapter structure 23 can be a sheet structure with a certain thickness, and the adapter structure 23 can be provided in any shape such as a rectangle, a circle, an ellipse, a polygon, or other irregular shape. The shape of the adapter structure 23 can be changed and adjusted according to the structural form and positional relationship between the tab 221 and the electrode terminal 214 in the battery cell 20. For example, the adapter structure 23 can also have a structure protruding upward, and the top surface of the protruding part is in contact with the electrode terminal 214 to achieve electrical connection between the adapter structure 23 and the electrode terminal 214. The material of the adapter structure 23 can be selected from metals such as aluminum and copper, or other conductive materials such as aluminum-containing alloy and copper-containing alloy.

[0122] The shape of the projection of the adapter structure 23 in the thickness direction thereof can be a rectangle, a circle, or any other shape. In some embodiments, the shape of the adapter structure 23 can be provided corresponding to the electrode terminal 214 in the battery cell 20, respectively. For example, the adapter structure 23 can be provided in a long strip shape in the projection in the thickness direction thereof to match the shape of the electrode terminal 214.

[0123] In some embodiments, a pressure relief mechanism can be provided on the shell 21. As shown in Figure 3 The battery cell 20 can also include a pressure relief mechanism 213. The pressure relief mechanism 213 is used to discharge the internal gas of the battery cell.

[0124] As an example, the internal pressure or temperature of the battery cell 20 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 213 performs an action or a weak structure provided in the pressure relief mechanism 213 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is different according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0125] As an example, the pressure relief mechanism 213 can be integrally formed with the shell 21.

[0126] As an example, the pressure relief mechanism 213 can also be provided separately from the shell 21 and connected.

[0127] The term "actuation" as used in this application refers to the pressure relief mechanism 213 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 213 may include, but are not limited to: movement of components within the pressure relief mechanism 213 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 213, etc. When the pressure relief mechanism 213 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0128] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0129] In this embodiment, the arrangement of the battery cells can be configured according to the actual application. The battery device 10 in this embodiment includes multiple battery cells 20 that can be arranged and positioned in any direction within the housing 11. For example, as shown... Figure 3 Taking the rectangular battery cell 20 shown as an example, as Figure 2 As shown, multiple battery cells 20 can be arranged as follows Figure 3 The cells are installed vertically inside the housing, such that the end caps 212 of the multiple battery cells 20, after installation, face the first housing portion 111, while the bottom wall of the housing 211 of the battery cell 20 faces the second housing portion 112. For example, with... Figure 2 Different, and can also include multiple such Figure 3 The battery cell 20 shown is arranged horizontally inside the box.

[0130] Figure 4 A schematic diagram showing the connection between electrode terminal 214 and adapter structure 23 according to an embodiment of this application is illustrated. Figure 4 As shown, the battery cell 20 in this embodiment may include a housing 211, an electrode assembly 22 housed within the housing 211, an electrode terminal 214 disposed on the housing 211, and a connecting structure 23 electrically connected to the electrode assembly 22 and the electrode terminal 214; wherein, the connecting structure 23 and the electrode terminal 214 are fixedly connected by a first connecting portion 311 and a second connecting portion 312, the first connecting portion 311 and the second connecting portion 312 are spaced apart, and the second connecting portion 312 is disposed outside the first connecting portion 311.

[0131] In the embodiment of the present application, the second connecting portion 312 is arranged to protect the first connecting portion 311, reduce the tearing range of the electrode terminal 214 and the adapter structure 23 at the first connecting portion 311 under vibration of the battery monomer 20, reduce the failure probability of the first connecting portion 311, improve the connection strength between the electrode terminal 214 and the adapter structure 23, and further improve the reliability of the battery monomer 20.

[0132] Figure 5 A connection diagram of the electrode terminal 214 and the adapter structure 23 of another embodiment of the present application is shown.

[0133] In some embodiments, as shown in Figure 4 and Figure 5 , the second connecting portion 312 includes a plurality of disconnected welding tracks, and the plurality of disconnected welding tracks form a track around the first connecting portion 311.

[0134] By arranging the plurality of disconnected welding tracks around the first connecting portion 311, under vibration of the battery monomer 20, the vibration load is dispersed to the plurality of disconnected welding tracks of the second connecting portion 312, the vibration load is concentrated on a single welding track of the first connecting portion 311 is reduced, the risk of increasing the failure probability of the first connecting portion 311 is reduced, the connection strength between the electrode terminal 214 and the adapter structure 23 is improved, and the reliability of the battery monomer 20 is improved.

[0135] In some embodiments, as shown in Figure 4 and Figure 5 , the plurality of disconnected welding tracks includes a plurality of disconnected arc tracks, and the plurality of disconnected arc tracks form a circular profile around the first connecting portion 311, i.e., the second connecting portion 312. By arranging the plurality of disconnected arc tracks to form a circular profile around the first connecting portion 311, under vibration of the battery monomer 20, the phenomenon of excessive local stress of the first connecting portion 311 and the second connecting portion 312 can be reduced, the failure probability of the first connecting portion 311 can be reduced, and the connection strength between the electrode terminal 214 and the adapter structure 23 can be improved.

[0136] The number of segments of the arc track of the embodiment of the present application can be flexibly arranged according to actual application, and can be 1-10 segments, which is not limited in the present application. For example, the arc track of the embodiment of the present application can be 1 segment, i.e., 1 segment of the arc track is arranged around the first connecting portion 311 and is not connected to the first connecting portion 311. For another example, the arc track of the embodiment of the present application can be 2 segments, i.e., 2 segments of the arc track are arranged around the first connecting portion 311 and are not connected to the first connecting portion 311. Figure 5For example, the discontinuous circular arc track can be 3 segments, and the 3 segments of discontinuous circular arc tracks are arranged around the first connecting part 311 to form a circular contour around the first connecting part 311, so that the stress of the first wall 31 is uniformly distributed, and the risk of crack formation of the first wall 31 is reduced. In this way, compared with a continuous connecting part, the phenomenon of excessive local stress of the first connecting part 311 can be reduced, the failure probability of the first connecting part 311 is reduced, and the welding strength between the electrode terminal 214 and the adapter structure 23 is improved.

[0137] Figure 6 FIG. 6 shows a connection diagram of an electrode terminal 214 and an adapter structure 23 according to another embodiment of the present application, Figure 7 FIG. 6 shows a connection diagram of an electrode terminal 214 and an adapter structure 23 according to another embodiment of the present application.

[0138] In some embodiments, the second connecting part 312 is a non-closed circular track or a polygonal track. By arranging the non-closed circular track or the polygonal track, the track of the second connecting part 312 is adapted to the adapter structure 23. In the case of vibration of the battery monomer 20, the vibration load can be dispersed to the circular track or the polygonal track segment of the second connecting part 312, the failure probability of the first connecting part 311 is reduced, and the connection strength between the electrode terminal 214 and the adapter structure 23 is improved. Figure 6 For example, the plurality of segments of discontinuous welding tracks includes a plurality of segments of discontinuous straight line tracks, and the plurality of segments of discontinuous straight line tracks form a polygonal contour around the first connecting part 311. In this way, by arranging the plurality of segments of discontinuous straight line tracks, in the case of vibration of the battery monomer 20, the vibration load is dispersed to the plurality of segments of straight line tracks of the second connecting part 312, the failure probability of the first connecting part 311 is reduced, and the connection strength between the electrode terminal 214 and the adapter structure 23 is improved.

[0139] The number of segments of the straight line track in the embodiment of the present application can be flexibly arranged according to actual application, and can be 1-10 segments, which is not limited in the present application.

[0140] In some embodiments, the second connecting part 312 is a non-closed circular track or a polygonal track. By arranging the non-closed circular track or the polygonal track, the track of the second connecting part 312 is adapted to the adapter structure 23. In the case of vibration of the battery monomer 20, the vibration load can be dispersed to the circular track or the polygonal track segment of the second connecting part 312, the failure probability of the first connecting part 311 is reduced, and the connection strength between the electrode terminal 214 and the adapter structure 23 is improved.

[0141] As shown in FIG. 6, Figure 4 and Figure 5 As shown in FIG. 6, the second connecting part 312 can be a non-closed circular track, which can reduce the stress concentration problem of the first connecting part 311, reduce the local stress of the first connecting part 311, reduce the failure probability of the first connecting part 311, and improve the welding strength between the electrode terminal 214 and the adapter structure 23.

[0142] In some embodiments, as shown in FIG. 6, Figure 6 and Figure 7As shown, the second connecting portion 312 can be a non-closed polygonal trajectory, and the shape of the trajectory can be set according to actual design requirements. For example, as shown in FIG. 3B, the second connecting portion 312 can be a non-closed hexagonal trajectory. Figure 7 As shown, if a non-closed hexagonal trajectory is adopted, the second connecting portion 312 is arranged around the first connecting portion 311 in six connecting segments, which is conducive to reducing the failure probability of the first connecting portion 311.

[0143] The polygonal trajectory of the present application can be flexibly set according to actual application. For example, as shown in FIG. 3A, the second connecting portion 312 can be a non-closed quadrilateral trajectory. Figure 7 For example, the polygonal trajectory of the embodiment of the present application can be a hexagon, that is, six second connecting portions 312 are arranged outside the first connecting portion 311, and the six welding trajectories can be connecting trajectories of the same shape or connecting trajectories of different shapes. For example, the second connecting portion 312 includes two straight line trajectories and four circular arc trajectories. Through this setting mode, the setting of the second connecting portion 312 will be more flexible, and the second connecting portion 312 including different connecting trajectories can be set according to actual application.

[0144] In some embodiments, the minimum distance L between the first connecting portion 311 and the second connecting portion 312 satisfies: 0.1mm~20mm.

[0145] Figure 8 A connection schematic diagram of an electrode terminal and a switching structure of another embodiment of the present application is shown in FIG. 3C. Figure 8 As shown, a suitable minimum distance L is arranged between the first connecting portion 311 and the second connecting portion 312, which is conducive to improving the connection strength between the electrode terminal 214 and the electrode assembly 22. In the case where the minimum distance L is greater than or equal to 0.1mm, there is a certain distance between the first connecting portion 311 and the second connecting portion 312, which can reduce the heat accumulation and local overheating of the first connecting portion 311 and the second connecting portion 312 in the welding process, so as to avoid the phenomenon that the electrode terminal 214 and the switching structure 23 cannot be fixedly connected through the first connecting portion 311 and the second connecting portion 312. In the case where the minimum distance L is less than or equal to 20mm, the distance between the second connecting portion 312 and the first connecting portion 311 is reduced, and in the case where the battery monomer 20 vibrates, the second connecting portion 312 cannot disperse the vibration load, and the failure probability of the first connecting portion 311 is increased.

[0146] In some embodiments, L may also be other values. For example, L may be any one of the following values ​​or between any two of the following values: 0.1mm, 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, 11.0mm, 12.0mm, 13.0mm, 14.0mm, 15.0mm, 16.0mm, 17.0mm, 18.0mm, 19.0mm, and 20.0mm.

[0147] In some embodiments, the minimum distance L1 between multiple unconnected circular arc trajectories satisfies: 0.1mm~15mm.

[0148] Figure 9 This illustration shows a connection diagram of the electrode terminal 214 and the adapter structure 23 according to another embodiment of this application. In this embodiment, as shown... Figure 9 As shown, the minimum distance L1 between the multiple unconnected arc trajectories is between 0.1mm and 15mm. By setting a suitable minimum distance between the multiple unconnected arc trajectories, the stress concentration problem of the first connection portion 311 can be reduced, and the connection strength between the electrode terminal 214 and the transition structure 23 can be improved. When the minimum distance L1 between the multiple arc trajectories is greater than or equal to 0.1mm, it is beneficial for the second connection portion 312 to disperse stress under the vibration of the battery cell 20, avoiding interconnection between the arc trajectories of the second connection portion 312 and reducing the failure probability of the first connection portion 311. When the minimum distance L1 between the multiple arc trajectories is less than or equal to 15mm, it reduces the possibility of excessively large distances between the welding trajectories of the second connection portion 312, which could lead to an inability to disperse vibration loads under the vibration of the battery cell 20, increasing the failure probability of the first connection portion 311, and thus improving the connection strength between the electrode terminal and the transition structure.

[0149] In some embodiments, the range of L1 can also be other values. For example, the value of L1 can be any one of the following values ​​or between any two of the following values: 0.1mm, 0.5mm, 1.0mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, 10.0mm, 10.5mm, 11.0mm, 11.5mm, 12.0mm, 12.5mm, 13.0mm, 13.5mm, 14.0mm, 14.5mm, and 15.0mm.

[0150] In some embodiments, the minimum distance L2 between multiple unconnected straight line trajectories satisfies: 0.1mm~15mm.

[0151] Figure 10 This diagram illustrates the connection between electrode terminal 214 and adapter structure 23 according to an embodiment of this application. In this embodiment, as shown... Figure 10 As shown, the minimum distance L2 between multiple unconnected straight tracks is between 0.1mm and 15mm. By setting the minimum distance L2 between multiple unconnected straight tracks to meet the above range, the failure probability of the first connection part 311 can be reduced, and the connection strength between the electrode terminal 214 and the transition structure 23 can be improved. When the minimum distance L2 between multiple unconnected straight tracks is greater than or equal to 0.1mm, it is beneficial for the second connection part 312 to disperse stress under the vibration of the battery cell 20, thus reducing the failure probability of the first connection part 311. When the minimum distance L between multiple arc tracks is less than or equal to 15mm, it reduces the possibility that the distance between the welding tracks of the second connection part 312 is too large, which would prevent the vibration load from being dispersed under the vibration of the battery cell 20, thereby increasing the failure probability of the first connection part 311 and improving the connection strength between the electrode terminal 214 and the transition structure 23.

[0152] In some embodiments, the range of L2 may also be other values. For example, the value of L2 may be any one of the following values ​​or between any two of the following values: 0.1mm, 0.5mm, 1.0mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, 10.0mm, 10.5mm, 11.0mm, 11.5mm, 12.0mm, 12.5mm, 13.0mm, 13.5mm, 14.0mm, 14.5mm, and 15.0mm.

[0153] In this embodiment, the distance between adjacent straight track segments can be the same or different, and can be adjusted according to the needs of actual application. This application does not limit this. As long as the first connecting part 311 and the second connecting part 312 are distributed at intervals in this embodiment, and the second connecting part 312 is located outside the first connecting part 311, the minimum distance L2 between multiple unconnected straight track segments can be 0.1mm to 15mm.

[0154] In some embodiments, the welding manner of the welding track comprises at least one of laser welding, shielded metal arc welding, submerged arc welding, argon arc welding, gas welding, friction welding, ultrasonic welding, hot melt welding or hot pressure welding. In this way, different welding manners can be selected according to actual use requirements, and the connection strength between the electrode terminal and the adapter structure is improved. For example, in laser welding, a laser beam is heated by high energy concentration, and the welding process is accurately controlled, which is suitable for small-area and high-precision welding; in argon arc welding, argon is used as a protective gas, and an electric arc is used to heat the contact surface between the electrode terminal 214 and the adapter structure 23; in gas welding and friction welding, the electrode terminal 214 and the adapter structure 23 are fixedly connected through the action of heat and pressure.

[0155] In actual application, the minimum distance within the above range can be set according to different welding methods. For example, when the fixed connection between the electrode terminal 214 and the adapter structure 23 is achieved by laser welding, the laser is focused accurately, which is suitable for the fixed connection when the above minimum distance is small; when the fixed connection between the electrode terminal 214 and the adapter structure 23 is achieved by spot welding or ultrasonic welding, the welding head is large and the heat diffuses quickly, which is suitable for the fixed connection when the above minimum distance is large. In this way, when welding, the heat can be effectively distributed between the first connecting portion 311 and the second connecting portion 312, the failure probability of the first connecting portion 311 is reduced, the connection strength between the electrode terminal 214 and the adapter structure 23 is improved, the electrical connection between the electrode terminal 214 and the adapter structure 23 is achieved, and the reliability of the battery monomer 20 is improved.

[0156] In some embodiments, the first connecting portion 311 is a continuous spiral track.

[0157] As shown in the embodiments of the present application, the first connecting portion 311 is a continuous spiral track, the first connecting portion 311 has a continuous connection path, which is beneficial to the interval arrangement of the first connecting portion 311 and the second connecting portion 312, and the first connecting portion 311 is arranged outside the first connecting portion 311, thereby facilitating the protection of the first connecting portion 311 by the second connecting portion 312, reducing the tearing amplitude of the electrode terminal 214 and the adapter structure 23 at the first connecting portion 311 under vibration of the battery monomer 20, reducing the failure probability of the first connecting portion 311, and improving the connection strength between the electrode terminal 214 and the adapter structure 23.

[0158] In some embodiments, the first connecting portion 311 and the second connecting portion 312 are arranged on the first wall 31 of the electrode terminal 214 close to the adapter structure 23, the first wall 31 comprises a main body region 3111 and an extension region 3121 arranged around the main body region 3111, the extension region 3121 extends away from the main body region 3111; the first connecting portion 311 is located in the main body region 3111, and the second connecting portion 312 is located in the extension region 3121.

[0159] In some embodiments, the first wall 31 can be an outer surface of the electrode terminal 214, i.e., the first wall 31 is a surface of the electrode terminal 214 facing the outside of the battery cell 20. For example, in the embodiments of the present application, the first wall 31 is an outer surface of the electrode terminal 214.

[0160] In the embodiments of the present application, the first wall 31 includes a main body region 3111 and an extension region 3121 arranged around the main body region 3111, the extension region 3121 extends in a direction away from the main body region 3111, so that when the first connecting portion 311 is arranged in the main body region 3111, the second connecting portion 312 can be located only in the extension region 3121, so that the position of the second connecting portion 312 is arranged more flexibly, which is conducive to achieving the interval distribution of the first connecting portion 311 and the second connecting portion 312, and the second connecting portion 312 is arranged outside the first connecting portion 311.

[0161] In some embodiments, the shape of the contour of the main body region 3111 and the extension region 3121 can also be flexibly arranged according to actual application; and the shape of the contour of the main body region 3111 and the shape of the contour of the extension region 3121 can be the same or different. Figure 11 The connection schematic diagram of the electrode terminal 214 and the adapter structure 23 of still another embodiment of the present application is shown, for example, in Figure 11 For example, the contour of the main body region 3111 is rectangular; and / or the contour of the extension region 3121 is arc-shaped. These shapes are relatively regular, simple to process, and easy to achieve the interval distribution of the first connecting portion 311 and the second connecting portion 312, and the second connecting portion 312 is arranged outside the first connecting portion 311.

[0162] It should be understood that the area of the wall of the battery cell 20 where the electrode terminal 214 is located is limited, especially for the wall with smaller size, and the area occupied by the electrode terminal 214 is usually small. For example, for a cylindrical battery cell, the electrode terminal 214 is usually located at the bottom surface with smaller area; or for other shapes of battery cells, considering that the wall with larger area is usually used for heat dissipation, the electrode terminal is arranged on the wall with smaller area of the battery cell, and the wall where the electrode terminal is located can also need to be provided with other structures, further limiting the area occupied by the electrode terminal. In the embodiments of the present application, the number of the extension regions 3121 can be flexibly arranged according to actual application. For example, the first wall 31 includes four extension regions 3121, which are respectively arranged around the main body region 3111. In this way, the four extension regions 3121 make up for the size of the main body region 3111, which is conducive to achieving the interval distribution of the first connecting portion 311 and the second connecting portion 312, and the second connecting portion 312 is arranged outside the first connecting portion 311.

[0163] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present 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 in that, include: Shell (211); Electrode assembly (22) is housed within the housing (211); Electrode terminals (214) are disposed on the housing (211); The adapter structure (23) is electrically connected to the electrode assembly (22) and the electrode terminal (214). The adapter structure (23) and the electrode terminal (214) are fixedly connected by a first connecting part (311) and a second connecting part (312). The first connecting part (311) and the second connecting part (312) are spaced apart, and the second connecting part (312) is located outside the first connecting part (311).

2. The battery cell according to claim 1, characterized in that, The second connection portion (312) includes multiple unconnected welding tracks that form a track around the first connection portion (311).

3. The battery cell according to claim 2, characterized in that, The multi-segment unconnected welding trajectory includes multiple unconnected arc trajectories, which form a circular outline around the first connection portion.

4. The battery cell according to claim 2, characterized in that, The multi-segment unconnected welding trajectory includes multiple unconnected straight line trajectories, which form a polygonal outline around the first connection portion.

5. The battery cell according to claim 1, characterized in that, The second connecting part (312) is a non-closed circular trajectory or a polygonal trajectory.

6. The battery cell according to claim 1, characterized in that, The minimum distance L between the first connecting part (311) and the second connecting part (312) satisfies: 0.1mm~20mm.

7. The battery cell according to claim 3, characterized in that, The minimum distance L1 between the multiple unconnected circular arc trajectories satisfies: 0.1mm~15mm.

8. The battery cell according to claim 4, characterized in that, The minimum distance L2 between the multiple unconnected straight line trajectories satisfies: 0.1mm~15mm.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The first connecting part (311) is a continuous spiral trajectory.

10. The battery cell according to claim 1, characterized in that, The welding method of the welding trajectory includes at least one of the following: laser welding, shielded metal arc welding, submerged arc welding, argon arc welding, gas welding, friction welding, ultrasonic welding, hot melt welding, or hot pressure welding.

11. The battery cell according to claim 1, characterized in that, The first connecting portion (311) and the second connecting portion (312) are disposed on the first wall (31) of the electrode terminal (214) near the adapter structure (23). The first wall (31) includes a main body region (3111) and an extension region (3121) disposed around the main body region (3111). The extension region (3121) extends in a direction away from the main body region (3111). The first connecting part (311) is located in the main body region (3111), and the second connecting part (312) is located in the extension region (3121).

12. A battery device, characterized in that, include: The battery cell as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, include: The battery device of claim 12, wherein the battery device is used to provide electrical energy to the electrical equipment.

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