Adapter plate, battery and electric appliance

Abstract

This application provides an adapter, a battery, and an electrical device, relating to the field of battery technology. The adapter includes a first connecting portion, a second connecting portion, and a fuse assembly. The first connecting portion is configured to connect to an electrode terminal; the second connecting portion is configured to connect to a tab; the fuse assembly includes a conductive coating. The first connecting portion, the conductive coating, and the second connecting portion are sequentially arranged, and the conductive coating connects the first connecting portion and the second connecting portion. Under normal operating temperature, the conductive coating can increase the cross-sectional area of ​​the entire fuse assembly, enabling the entire adapter to maintain stable current carrying capacity and conductivity, reducing DCR and improving battery energy efficiency. Simultaneously, because the conductive coating melts more easily at certain temperatures, the high temperature generated when a large current passes through can cause the conductive coating to melt promptly, thereby detaching from the adapter to cut off the circuit and improving battery safety. Thus, the adapter can simultaneously possess good safety and conductivity.

Description

Technical Field

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

[0002] In batteries, adapter plates connect different components and play a crucial role in conducting current. Existing adapter plate structures cannot effectively protect the battery and the entire circuit system in a timely manner under abnormal overcurrent conditions, easily leading to safety issues. Therefore, to improve battery safety, existing adapter plates are equipped with a fuse, which melts and breaks the circuit under high current surges. However, the fuse design reduces the adapter plate's overcurrent conductivity, causing it to overheat significantly during charging and discharging, increasing the battery's DC internal resistance (DCR), reducing energy efficiency, and affecting the battery's charge and discharge performance. Utility Model Content

[0003] The purpose of this application is to provide an adapter, a battery, and an electrical device, which aims to solve the problem that the adapter in the prior art cannot simultaneously ensure the safety and overcurrent conductivity of the battery.

[0004] In a first aspect, this application provides an adapter piece, including: a first connecting portion, a second connecting portion, and a fuse assembly. The first connecting portion is configured to be connected to an electrode terminal; the second connecting portion is configured to be connected to an electrode tab; the fuse assembly includes a conductive coating. Along a first direction, the first connecting portion, the conductive coating, and the second connecting portion are sequentially disposed, and the conductive coating connects the first connecting portion and the second connecting portion.

[0005] In one or more embodiments of this application, a first support portion is connected to one end of the first connecting portion facing the second connecting portion, a conductive coating is connected to the first support portion, and the thickness of the first support portion is less than the thickness of the first connecting portion;

[0006] The second connecting part is connected to the second supporting part at one end facing the first connecting part. The conductive coating is connected to the second supporting part, and the thickness of the second supporting part is less than the thickness of the second connecting part.

[0007] In one or more embodiments of this application, the end of the first support portion away from the first connecting portion has a first drainage structure, and the end of the second support portion away from the second connecting portion has a second drainage structure. A first drainage channel for guiding the molten conductive coating to fall off is formed between the first drainage structure and the second drainage structure. The first drainage structure is inclined relative to the first connecting portion, and / or the second drainage structure is inclined relative to the second connecting portion.

[0008] In one or more embodiments of this application, the fuse assembly further includes a fuse portion connected between the first support portion and the second support portion; the thickness of the fuse portion is less than the thickness of the first connecting portion or the second connecting portion.

[0009] In one or more embodiments of this application, the fuse portion includes a fuse portion body and a third draining structure. The fuse portion body is connected between a first support portion and a second support portion. The third draining structure is connected to at least one side of the fuse portion body along a second direction. The second direction and the first direction are perpendicular to each other.

[0010] The third drainage structure has a first part and a second part. A second drainage channel is formed between the first part and the first support part to guide the molten conductive coating to fall off. A third drainage channel is formed between the second part and the second support part to guide the molten conductive coating to fall off. The first part is inclined relative to the first connecting part, and the second part is inclined relative to the second connecting part.

[0011] In one or more embodiments of this application, at least a portion of the first support is embedded in the conductive coating, and / or at least a portion of the second support is embedded in the conductive coating, and / or the conductive coating covers at least a portion of the fused portion.

[0012] In one or more embodiments of this application, the first support portion has a first positioning recess formed on at least one surface in a third direction, and the conductive coating is provided with a first positioning protrusion that mates with the first positioning recess. The first positioning protrusion is disposed within the first positioning recess; the third direction and the first direction are perpendicular to each other.

[0013] And / or,

[0014] The second support portion has a second positioning recess formed on at least one surface in a third direction, and a second positioning protrusion that mates with the second positioning recess is provided on the conductive coating; the second positioning protrusion is disposed in the second positioning recess; and / or

[0015] The fused portion has a third positioning recess formed on at least one surface in a third direction, and the conductive coating has a third positioning protrusion that mates with the third positioning recess. The third positioning protrusion is located in the third positioning recess.

[0016] In one or more embodiments of this application, the melting temperature of the conductive coating is lower than the melting temperature of the fuse body;

[0017] And / or, the conductive coating material includes a conductive polymer, and the conductivity of the conductive coating material is 10. -7 ~10 -2 S / M;

[0018] And / or, the sum of the cross-sectional areas S of the conductive coating and the fuse body satisfies: C×N / 20A / mm² < S < C×N / 3A / mm² 2 Where C is the cell capacity and N is the charge / discharge rate.

[0019] Secondly, this application provides a battery comprising: a tab, an electrode terminal, and an adapter as described in any one of the first aspects, wherein a first connecting portion of the adapter is connected to the electrode terminal, and a second connecting portion of the adapter is connected to the tab.

[0020] Thirdly, this application provides an electrical device including the battery described in the second aspect.

[0021] Based on the above technical solution, the adapter, battery, and electrical device of this application have at least the following beneficial technical effects:

[0022] The adapter provided in this application configures the fuse assembly to include a conductive coating. Along a first direction, a first connecting portion for connection with the electrode terminals, a conductive coating, and a second connecting portion for connection with the tabs are sequentially arranged. The conductive coating connects the first connecting portion and the second connecting portion, allowing current to flow from the first connecting portion through the conductive coating of the fuse assembly into the second connecting portion, or from the second connecting portion through the conductive coating of the fuse assembly into the first connecting portion. At normal operating temperature, the conductive coating increases the cross-sectional area of ​​the entire fuse assembly, enabling the adapter to maintain stable overcurrent capacity and conductivity, reducing DC internal resistance (DCR), and improving battery energy efficiency. Simultaneously, since the conductive coating melts more easily at a certain temperature, the high temperature generated when a large current passes through the conductive coating can cause it to melt in time, thereby detaching from the adapter to cut off the circuit and improve battery safety. Thus, the adapter of this application can simultaneously possess good safety and conductivity. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of a battery cell provided in an embodiment of this application.

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the adapter provided in the embodiments of this application.

[0026] Figure 3This is a side view of the adapter plate provided in the embodiment of this application.

[0027] Figure 4 This is a three-dimensional structural schematic diagram of the adapter plate provided in the embodiment of this application from another perspective.

[0028] Figure 5 This is a schematic diagram of the adapter sheet provided in the embodiments of this application, omitting the conductive coating.

[0029] Figure 6 This is a three-dimensional structural schematic diagram of the adapter plate provided in another embodiment of this application.

[0030] Figure 7 This is a three-dimensional structural schematic diagram of the adapter plate provided in another embodiment of this application from another perspective.

[0031] Figure 8 This is a schematic diagram of the exploded disassembly structure of the adapter provided in another embodiment of this application.

[0032] Figure 9 This is a three-dimensional structural diagram of an adapter piece provided in another embodiment of this application, omitting the conductive coating.

[0033] Figure 10 This is a three-dimensional structural diagram of the conductive coating in the adapter sheet provided in another embodiment of this application.

[0034] Figure 11 This is a three-dimensional structural schematic diagram of the conductive coating in the adapter sheet provided in another embodiment of this application, from another perspective.

[0035] In the figure: 1-Top cover assembly; 2-House; 3-Top cover piece; 10-Adapter piece; 11-First connecting part; 12-Second connecting part; 13-Fuse assembly; 14-Electrode terminal; 15-First drainage channel; 16-Second drainage channel; 17-Third drainage channel; 111-First support part; 112-First positioning recess; 113-First drainage structure; 121-Second support part; 122-Second positioning recess; 123-Second drainage structure; 130-First positioning protrusion; 131-Conductive coating; 132-Fuse part; 133-Third positioning recess; 134-Second positioning protrusion; 135-Third positioning protrusion; 1321-Fuse part body; 1322-Third drainage structure; 1323-First part; 1324-Second part. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0037] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] During battery use, the adapter plate is a component that connects the battery's internal electrodes to the external circuitry, playing a crucial role in connecting different components and conducting current. To ensure that the adapter plate can effectively protect the battery and the entire circuit system in a timely manner under abnormal overcurrent conditions, existing adapter plate structures incorporate a fuse to break the circuit under high current surges. However, to ensure timely short-circuit breaking, the cross-sectional area of ​​the fuse is typically small. This allows the large current flowing through the fuse to generate significant heat, causing the fuse to melt. However, a small fuse cross-section also results in a higher drain current rate (DCR) and lower energy efficiency under normal operating conditions, impacting the battery's overcurrent capacity and normal charge / discharge performance.

[0041] Based on the above considerations, and in order to address the problem that existing adapters cannot simultaneously ensure battery safety and overcurrent conductivity, this application provides an electrical device, a battery, and an adapter.

[0042] The electrical equipment described in this application can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or 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.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc.

[0043] This application describes an electrical device using a vehicle as an example. The vehicle 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 is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery to supply power to the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle. The battery can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0044] As one embodiment of the battery, the aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. The multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then the multiple battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0045] Multiple battery cells can be mounted on supporting structures such as housings, frames, and brackets. Electrical connections between battery cells and between battery cells and the battery management system can be established via electrical connectors, which can be busbars. Alternatively, battery cells can be electrically connected by plugging in their respective electrode terminals. For example, between two adjacent battery cells, one battery cell has a slot on its electrode terminal, and the other battery cell has a corresponding plug-in. The plug-in is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the electrode terminal of another battery cell. Similarly, battery cells and the battery management system can also be electrically connected by plugging in each other, which will not be elaborated further here.

[0046] The aforementioned battery cell can be a secondary battery or a primary battery, and can also be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. Its external outline can be cylindrical, flat, cuboid, or other shapes, but is not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0047] As one embodiment of a battery cell, please refer to Figure 1 A battery cell refers to the smallest unit that makes up a battery. A battery cell includes a housing 2, an electrode assembly, a top cover assembly 1, and other functional components. At least one end of the housing 2 has an opening, and the top cover assembly 1 covers the opening of the housing 2 to isolate the internal environment of the battery cell from the external environment. The housing 2 has an internal cavity to house the electrode assembly. The housing 2 is a component used to cooperate with the top cover assembly 1 to form the internal environment of the battery cell, wherein the formed internal environment can accommodate the electrode assembly, electrolyte, and other components. The housing 2 and the top cover assembly 1 can be independent components. An opening can be provided on the housing 2, and the top cover assembly 1 closes the opening to form the internal environment of the battery cell. The housing 2 can have various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the housing 2 can be determined according to the specific shape and size of the electrode assembly. The material of the housing 2 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0048] The top cover assembly 1 includes a top cover sheet 3, which covers the opening of the housing 2. The shape of the top cover sheet 3 can be adapted to the shape of the housing 2 to fit it. Optionally, the top cover sheet 3 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover sheet 3 is less prone to deformation under pressure and impact, allowing the battery cell to have higher structural strength and improved safety performance. The material of the top cover sheet 3 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, the top cover sheet 3 can be provided with functional components such as electrode terminals 14. The electrode terminals 14 can be electrically connected to the electrode assembly through the adapter piece 10 for outputting or inputting electrical energy from the battery cell. The top cover sheet 3 and the functional components such as the electrode terminals 14 disposed on the top cover sheet 3 together constitute the top cover assembly 1.

[0049] As one embodiment of an electrode assembly, the electrode assembly is a component in a battery cell that undergoes an electrochemical reaction with the electrolyte. The housing 2 may contain one or more electrode assemblies. The electrode assembly 6 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode sheets. The separator, positioned between the positive and negative electrode sheets, can reduce short circuits between the positive and negative electrodes while allowing active ions to pass through. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected. The positive electrode sheet may include a positive current collector and positive active material layers coated on opposite sides of the positive current collector. The negative electrode sheet may include a negative current collector and negative active material layers coated on opposite sides of the negative current collector. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends. The electrode assembly is covered with an insulating film to reduce the risk of short circuits.

[0050] In some embodiments, each electrode assembly extends a positive electrode tab and a negative electrode tab to the end face of the top cover assembly 1, respectively. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte. The electrode tabs can be connected to the electrode terminals 14 through the adapter piece 10 to form a current loop.

[0051] It should be noted that the "electrode terminal 14" mentioned in this application can be either a positive electrode terminal or a negative electrode terminal. The "tab" mentioned in this application can be either a positive electrode tab or a negative electrode tab, as long as the tab connected to the positive electrode terminal is a positive electrode tab and the tab connected to the negative electrode terminal is a negative electrode tab.

[0052] The first direction X, the second direction Y, and the third direction Z described in this application are all mutually perpendicular. The first direction X can be the length direction of the adapter piece 10, i.e., the length direction of the battery cell. The second direction Y can be the width direction of the adapter piece 10, i.e., the thickness direction of the battery cell. The third direction Z can be the thickness direction of the adapter piece 10, i.e., the height direction of the battery cell.

[0053] As one embodiment of the adapter, please refer to Figures 2 to 11 The adapter provided in this application includes a first connecting portion 11, a second connecting portion 12, and a fuse assembly 13. The first connecting portion 11 is configured to be connected to an electrode terminal 14; the second connecting portion 12 is configured to be connected to a tab; the fuse assembly 13 includes a conductive coating 131. Along a first direction X, the first connecting portion 11, the conductive coating 131, and the second connecting portion 12 are sequentially arranged, and the conductive coating 131 connects the first connecting portion 11 and the second connecting portion 12.

[0054] The first connecting portion 11 is used to connect to the electrode terminal 14, and the second connecting portion 12 is used to connect to the tab. The fuse assembly 13 can be understood as a structure that melts preferentially before the first connecting portion 11 and the second connecting portion 12 when thermal runaway occurs in the battery cell. This allows the fuse assembly 13 to promptly disconnect the circuit in the event of thermal runaway within the battery cell. The fuse assembly 13 can be a combination structure including one or more structural components. The conductive coating 131 can be a material layer with conductivity that preferentially melts at a certain temperature.

[0055] In the technical solution of this application embodiment, the fuse assembly 13 is configured to include a conductive coating 131. Along the first direction X, a first connecting portion 11 for connecting to the electrode terminal 14, the conductive coating 131, and a second connecting portion 12 for connecting to the tab are sequentially arranged. The conductive coating 131 connects the first connecting portion 11 and the second connecting portion 12, so that current can enter the second connecting portion 12 from the first connecting portion 11 through the conductive coating 131 or from the second connecting portion 12 through the conductive coating 131 into the first connecting portion 11. Under normal operating temperature, the conductive coating 131 can increase the cross-sectional area of ​​the entire fuse assembly 13, so that the entire adapter piece 10 maintains stable overcurrent capacity and conductivity, reduces DCR, and improves the energy efficiency of the battery. At the same time, since the conductive coating 131 is more likely to melt first at a certain temperature, when a large current passes through the conductive coating 131, the high temperature generated can make the conductive coating 131 melt in time and then detach from the adapter piece to cut off the circuit, thereby improving the safety of the battery. Thus, the adapter piece of this application can have both good safety and conductivity.

[0056] In some embodiments, the conductivity of the conductive coating 131 is 10. -7 ~10 -2 S / M. For example, conductivity could be 10. -7 S / m or 10 -6 S / m or 10 -5 S / m or 10 -4 S / m or 10 -3 S / m or 10 -2 S / m, so that the conductive coating 131 has good conductivity.

[0057] In some embodiments, the melting temperature of the conductive coating 131 is 80–300°C. This melting temperature allows the conductive coating 131 to melt preferentially over other structures of the adapter piece 10, thus disconnecting the circuit in a timely manner and improving battery safety.

[0058] The conductive coating 131 in this embodiment includes a conductive polymer. The material of the conductive coating 131 includes one or more of polypyrrole, polyphenylene acetylene, polyphenylene sulfide, polythiophene, polyfuran, polyaniline, polycarboxylic acid, derivatives of polypyrrole, derivatives of polyphenylene acetylene, derivatives of polyphenylene sulfide, derivatives of polythiophene, derivatives of polyfuran, derivatives of polyaniline, and derivatives of polycarboxylic acid.

[0059] In some embodiments, please refer to Figure 2 , Figure 5 Or refer to Figure 8 , Figure 9A first support portion 111 is connected to one end of the first connecting portion 11 facing the second connecting portion 12. The first support portion 111 can be an integral structure with the first connecting portion 11, or it can be a structural component separately connected to the first connecting portion 11. The conductive coating 131 is connected to the first support portion 111. This can be understood as the conductive coating 131 being coated on the first support portion 111 and connected to it. The thickness of the first support portion 111 is less than the thickness of the first connecting portion 11. This allows the conductive coating 131 to be coated on the surface of the first support portion 111 in the thickness direction, and the conductive coating 131 to be supported by the first support portion 111.

[0060] In some embodiments, a second support portion 121 is connected to one end of the second connecting portion 12 facing the first connecting portion 11. The second support portion 121 can be an integral structure with the second connecting portion 12, or it can be a structural component separately connected to the second connecting portion 12. The conductive coating 131 is connected to the second support portion 121, which can be understood as the conductive coating 131 being coated on the second support portion 121 and connected to it. The thickness of the second support portion 121 is less than the thickness of the second connecting portion 12. This allows the conductive coating 131 to be coated on the surface of the second support portion 121 in the thickness direction, and the conductive coating 131 to be supported by the second support portion 121. Thus, the connection between the conductive coating 131 and the first connecting portion 11 and the second connecting portion 12 is achieved through the first support portion 111 and the second support portion 121.

[0061] In some embodiments, along the second direction Y, the length of the first support portion 111 may be the same as the width of the first connecting portion 11, and the length of the second support portion 121 may be the same as the width of the second connecting portion 12, such as... Figure 5 or Figure 9 As shown. The conductive coating 131 may cover all or part of the surface of the first support portion 111 and / or the second support portion 121 along the second direction Y, so that its conductivity is not reduced when current flows through the fuse assembly 13. In some embodiments, along the third direction Z, that is, along the thickness direction of the adapter piece 10, the sum of the thicknesses of the conductive coating 131 and the first support portion 111 is consistent with the thickness of the first connecting portion 11, and the sum of the thicknesses of the conductive coating 131 and the second support portion 121 is consistent with the thickness of the second connecting portion 12, so that the DCR is reduced when current flows through the fuse assembly 13, thus ensuring its conductivity.

[0062] Of course, in some other embodiments, such as Figure 8As shown, along the second direction Y, the length of the first support portion 111 can be less than the width of the first connecting portion 11, and the length of the second support portion 121 can be less than the width of the second connecting portion 12. In this embodiment, the conductive coating 131 can completely cover the surface of the first support portion 111 or the second support portion 121 along the second direction Y, thereby ensuring the conductivity of the fusible assembly 13.

[0063] To better fix the conductive coating 131 to the first support portion 111 and the second support portion 121, at least a portion of the first support portion 111 is embedded in the conductive coating 131. At least a portion of the second support portion 121 is also embedded in the conductive coating 131. This allows for a fixed connection between the conductive coating 131 and the first support portion 111 and the second support portion 121, respectively.

[0064] Specifically, such as Figure 3 , Figure 5 , Figure 8 , Figure 9 , Figure 10 and Figure 11 The first support portion 111 has a first positioning recess 112 formed on at least one surface in the third direction Z. A first positioning protrusion 130, which mates with the first positioning recess 112, is disposed within the first positioning recess 112. The second support portion 121 has a second positioning recess 122 formed on at least one surface in the third direction Z. A second positioning protrusion 134, which mates with the second positioning recess 122, is disposed within the second positioning recess 122. The first positioning recess 112 and the second positioning recess 122 can be groove-shaped, such as... Figure 5 The illustrated embodiment can also be a through-hole type, such as... Figure 8 The embodiment shown. Therefore, when the first positioning recess 112 and the second positioning recess 122 are groove-type, the first positioning protrusion 130 and the second positioning protrusion 134 are protrusions corresponding to the groove. When the first positioning recess 112 and the second positioning recess 122 are through-hole type, the first positioning protrusion 130 and the second positioning protrusion 134 are protrusions corresponding to the through hole, such as... Figure 1 and Figure 11 The illustrated embodiment.

[0065] Please refer to Figure 2 and Figure 5The first support portion 111 has a first drainage structure 113 at the end away from the first connecting portion 11, and the second support portion 121 has a second drainage structure 123 at the end away from the second connecting portion 12. A first drainage channel 15 is formed between the first drainage structure 113 and the second drainage structure 123 to guide the molten conductive coating 131 to detach. The first drainage structure 113 and the second drainage structure 123 can guide the molten conductive coating to detach from the first support portion 111 and the second support portion 121 more quickly, so as to disconnect the circuit. The first drainage channel 15 is used to concentrate the molten conductive coating 131 to detach from the first support portion 111 and the second support portion 121. In order to guide the molten conductive coating 131 to detach more quickly, the first drainage structure 113 is inclined relative to the first connecting portion 11, and the second drainage structure 123 is inclined relative to the second connecting portion 12. It can be understood that the first drainage structure 113 and the second drainage structure 123 can be inclined slopes or inclined arc surfaces. The tilt angle can be from 15° to 85°, preferably from 30° to 60°, specifically from 25°, 35°, 45°, 55°, 65°, or 75°. In some embodiments, the first drainage structure 113 and the second drainage structure 123 can be tilted toward the first drainage channel 15 so that the molten conductive coating 131 can enter the first drainage channel 15 in a timely manner. This avoids the accumulation of too much molten conductive coating at high temperatures, achieving a diversion effect.

[0066] In the adapter piece of this application embodiment, the fusible component 13 may only include the conductive coating 131, such as Figures 2 to 5 The illustrated embodiment. In this embodiment, the conductive coating 131 maintains stable conductivity at normal operating temperature and melts promptly in case of overcurrent abnormalities, allowing heat to be quickly transferred to the conductive coating 131. The melting of the conductive coating 131 cuts off the connection area, preventing overcurrent damage to the battery and electronic devices. In some other embodiments, the fuse assembly 13 may include a fuse portion 132 in addition to the conductive coating 131, such as... Figures 6 to 9 In the illustrated embodiment, the fusible portion 132 is connected between the first support portion 111 and the second support portion 121; the thickness of the fusible portion 132 is less than the thickness of the first connecting portion 11 or the second connecting portion 12.

[0067] The fuse 132 can be integrally formed with the first connecting portion 11 and the second connecting portion 12. The fuse 132 refers to a structural component that, in the event of thermal runaway in a battery cell, melts preferentially over the first connecting portion 11 and the second connecting portion 12. This allows for timely circuit disconnection in the event of thermal runaway within the battery cell. To ensure that the fuse 132 melts preferentially over the first connecting portion 11 and the second connecting portion 12 in the event of thermal runaway in a battery cell, as follows... Figure 9 As shown, along the second direction Y, the length of the fuse portion 132 is less than the length of the first connecting portion 11 and less than the length of the second connecting portion 12, so that the current-passing area of ​​the fuse portion 132 is less than the current-passing area of ​​the first connecting portion 11 and less than the current-passing area of ​​the second connecting portion 12. In actual use, when the current is too high, due to the smaller current-passing area of ​​the fuse portion 132, the temperature rises faster at the fuse portion 132, allowing it to melt quickly and thus promptly cut off the circuit, greatly improving battery safety.

[0068] In some embodiments, the melting temperature of the conductive coating 131 is lower than the melting temperature of the fuse portion 132; so that when a large current passes through, the generated high temperature can melt the conductive coating 131 preferentially over the fuse portion 132, and then detach it from the adapter piece 10. As the temperature further increases, when the temperature reaches the melting temperature of the fuse portion 132, the fuse portion 132 melts, thereby cutting off the circuit and preventing overcurrent from damaging the battery cell or the battery. In this embodiment, on the one hand, the conductivity of the adapter piece 10 can be ensured by the conductive coating 131, and on the other hand, the fuse assembly 13 composed of the conductive coating 131 and the fuse portion 132 can ensure the safety of the battery.

[0069] In some embodiments, please refer to Figure 9 The fuse element 132 includes a fuse element body 1321, which is connected between the first support portion 111 and the second support portion 121. The fuse element body 1321 can be understood as a component that plays a major fusing role when a large current passes through. By placing the fuse element body 1321 between the first support portion 111 and the second support portion 121, a connection between the first connecting portion 11 and the second connecting portion 12 is achieved. Current can flow smoothly between the first connecting portion 11, the fuse element body 1321, and the second connecting portion 12.

[0070] In some embodiments, the cross-sectional area of ​​the fuse body 1321 is 3 to 15 mm. 2 Preferably, the cross-sectional area of ​​the fuse body 1321 is 3 mm. 2 Or 6mm 2 Or 8mm 2 or 10mm 2 Or 12mm 2 Or 15mm 2 .

[0071] In some embodiments, a third draining structure 1322 is connected to at least one side of the fuse body 1321 along the second direction Y. In some embodiments, the third draining structure 1322 is connected to both sides of the fuse body 1321 along the second direction Y, such as... Figure 9As shown. The third drainage structure 1322 can guide the molten conductive coating 131, allowing it to detach from the fuse body 1321 more quickly.

[0072] In some embodiments, please refer to Figure 9 The third drainage structure 1322 has a first portion 1323 and a second portion 1324. The first portion 1323 is disposed toward the first support portion 111 and is inclined relative to the first connecting portion 11. It can be understood that the first portion 1323 can be an inclined slope or an inclined arc surface so that the molten conductive coating 131 can be promptly detached from the third drainage structure 1322. The inclination angle of the first portion 1323 and the second portion 1324 can be 15° to 85°, preferably 30° to 60°, specifically 20°, 40°, 50°, 70°, or 80°. A second drainage channel 16 is formed between the first part 1323 and the first support part 111 to guide the molten conductive coating 131 to fall off. The second drainage channel 16 is used to allow the molten conductive coating 131 to pass through in a concentrated manner so as to separate from the first support part 111 and the fuse body 1321. This can avoid bearing too much molten conductive coating at high temperature and achieve a diversion effect.

[0073] The second part 1324 is disposed towards the second support part 121, and is inclined relative to the second connecting part 12. It is understood that the second part 1324 can be an inclined slope or an inclined arc surface, so that the molten conductive coating 131 can detach from the third flow-guiding structure 1322 in a timely manner. A third flow-guiding channel 17 is formed between the second part 1324 and the second support part 121 to guide the molten conductive coating 131 to detach. The third flow-guiding channel 17 is used to concentrate the molten conductive coating 131 through, so as to detach it from the second support part 121 and the fuse body 1321. This avoids accumulating too much molten conductive coating at high temperatures, achieving a flow-diverting effect.

[0074] To achieve the fixation of the fusible part 132 and the conductive coating 131, such as Figure 8 , Figure 9 and Figure 10 As shown, the fuse portion 132 has a third positioning recess 133 formed on at least one surface in the third direction Z. The conductive coating 131 has a third positioning protrusion 135 that mates with the third positioning recess 133. The third positioning protrusion 135 is disposed in the third positioning recess 133. In some embodiments, the third positioning recess 133 can be a groove-type structure or a through-hole-type structure. This allows the conductive coating 131 and the fuse portion 132 to be fixed by the third positioning protrusion 135 being embedded in the third positioning recess 133.

[0075] In some embodiments, the conductive coating 131 covers at least a portion of the fuse portion 132. In some embodiments, the conductive coating 131 may cover at least one surface of the fuse portion body 1321 and simultaneously cover the third drainage structure 1322. That is, the third drainage structure 1322 may be inserted into the conductive coating 131, so that the conductive coating 131 can surround the third drainage structure 1322, facilitating the timely detachment of the molten conductive coating 131 from the first portion 1323 and the second portion 1324 into the second drainage channel 16 and the third drainage channel 17.

[0076] In some embodiments, the sum S of the cross-sectional areas of the conductive coating 131 and the fuse body 1321 satisfies: C×N / 20A / mm 2 <S<C×N / 3A / mm 2 Where C represents the cell capacity and N represents the charge / discharge rate. It can be understood that the sum of the cross-sectional areas of the conductive coating 131 and the fuse body 1321 refers to the sum of the cross-sectional areas of the conductive coating 131 and the fuse body 1321 on the same plane perpendicular to the third direction Z, such that the current density is controlled between 3 and 20 A / mm². 2 This arrangement ensures that the adapter 10 possesses both good energy efficiency and safety. It should be noted that when the adapter 10 lacks the fuse section 132 structure, the cross-sectional area of ​​the fuse section body 1321 is 0, and S represents the cross-sectional area of ​​the conductive coating 131.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tab, characterized in that include: The first connecting part (11) is configured to be connected to the electrode terminal; The second connecting part (12) is configured to connect to the electrode tab; The fuse assembly (13) includes a conductive coating (131). Along a first direction (X), the first connecting portion (11), the conductive coating (131) and the second connecting portion (12) are sequentially arranged, and the conductive coating (131) connects the first connecting portion (11) and the second connecting portion (12).

2. The adapter plate of claim 1, wherein, The first connecting part (11) is connected to a first support part (111) at one end facing the second connecting part (12), and the conductive coating (131) is connected to the first support part (111). The thickness of the first support part (111) is less than the thickness of the first connecting part (11). The second connecting part (12) is connected to a second support part (121) at one end facing the first connecting part (11). The conductive coating (131) is connected to the second support part (121). The thickness of the second support part (121) is less than the thickness of the second connecting part (12).

3. The adapter plate of claim 2, wherein, The first support portion (111) has a first drainage structure (113) at one end away from the first connecting portion (11), and the second support portion (121) has a second drainage structure (123) at one end away from the second connecting portion (12). A first drainage channel (15) is formed between the first drainage structure (113) and the second drainage structure (123) to guide the molten conductive coating (131) to fall off. The first drainage structure (113) is inclined relative to the first connecting portion (11), and / or the second drainage structure (123) is inclined relative to the second connecting portion (12).

4. The adapter plate of claim 2 or 3, wherein, The fuse assembly (13) further includes a fuse portion (132) connected between the first support portion (111) and the second support portion (121); the thickness of the fuse portion (132) is less than the thickness of the first connecting portion (11) or the second connecting portion (12).

5. The adapter plate of claim 4, wherein, The fusible link (132) includes a fusible link body (1321) and a third draining structure (1322). The fusible link body (1321) is connected between the first support part (111) and the second support part (121). The third draining structure (1322) is connected to at least one side of the fusible link body (1321) along the second direction (Y). The second direction (Y) and the first direction (X) are perpendicular to each other. The third drainage structure (1322) has a first part (1323) and a second part (1324). A second drainage channel (16) for guiding the molten conductive coating (131) to fall off is formed between the first part (1323) and the first support part (111). A third drainage channel (17) for guiding the molten conductive coating (131) to fall off is formed between the second part (1324) and the second support part (121). The first part (1323) is inclined relative to the first connecting part (11), and the second part (1324) is inclined relative to the second connecting part (12).

6. The adapter plate of claim 5, wherein, At least a portion of the first support portion (111) is embedded in the conductive coating (131), and / or at least a portion of the second support portion (121) is embedded in the conductive coating (131), and / or the conductive coating (131) covers at least a portion of the fused portion (132).

7. The adapter plate of claim 6, wherein, The first support portion (111) has a first positioning recess (112) formed on at least one surface in the third direction (Z), and the conductive coating (131) has a first positioning protrusion (130) that mates with the first positioning recess (112), the first positioning protrusion (130) being disposed within the first positioning recess (112); the third direction (Z) and the first direction (X) are perpendicular to each other; And / or, The second support portion (121) has a second positioning recess (122) formed on at least one surface in a third direction (Z), and the conductive coating (131) has a second positioning protrusion (134) that mates with the second positioning recess (122), the second positioning protrusion (134) being disposed in the second positioning recess (122); and / or, The fused portion (132) has a third positioning recess (133) formed on at least one surface in the third direction (Z), and the conductive coating (131) has a third positioning protrusion (135) that cooperates with the third positioning recess (133), and the third positioning protrusion (135) is disposed in the third positioning recess (133).

8. The adapter plate of claim 5, wherein, The melting temperature of the conductive coating (131) is lower than the melting temperature of the fuse body (1321); And / or, the material of the conductive coating (131) comprises a conductive polymer, and the conductivity of the material of the conductive coating (131) is 10. -7 ~10 -2 S / M; And / or, the sum S of the cross-sectional areas of the conductive coating (131) and the fuse portion body (1321) satisfies: C x N / 20A / mm 2 <S < C x N / 3A / mm 2 wherein C is the capacity of the battery cell and N is the charge / discharge rate.

9. A battery, characterized by include: Extreme ear; Electrode terminal (14); The adapter (10) according to any one of claims 1 to 8, wherein the first connecting portion (11) of the adapter (10) is connected to the electrode terminal (14), and the second connecting portion (12) of the adapter (10) is connected to the tab.

10. An electric device, characterized by Includes the battery as described in claim 9.

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