Battery monomer and electric equipment

Abstract

The utility model provides a battery monomer and electric equipment, the battery monomer comprises a top cover assembly, an electrode assembly, an adapter and a connecting piece, the top cover assembly comprises a cover body and an electrode terminal; the electrode assembly is arranged on one side of the top cover assembly and comprises a pole piece and a pole lug connected with the pole piece; the adapter is arranged between the top cover assembly and the electrode assembly; the adapter comprises a first connecting part and a second connecting part, the first connecting part is connected with the electrode terminal, and the second connecting part is connected with the tab; the connecting piece is arranged on the side, away from the top cover assembly, of the adapter, and the orthographic projection of the connecting piece on the adapter covers the first connecting part and is arranged in a staggered mode with the second connecting part. The connecting piece is connected with the cover body; the connecting piece comprises a supporting plate and an adhesive layer arranged on the surface, close to the first connecting part, of the supporting plate, and the adhesive layer is attached to the first connecting part. The falling probability of the connecting piece can be reduced, the adhesive layer can adsorb foreign particles, the self-discharge and internal short-circuit probability of the electrode assembly is reduced, and the safety of the battery cell is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and a power-using device. BACKGROUND

[0002] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device can be a power battery, and the battery device can also be an energy storage battery.

[0003] Among them, in the battery monomer of the battery device, the tab of the battery cell is connected with the electrode terminal of the top cover assembly through the adapter piece. The adapter piece and the electrode terminal of the top cover assembly are usually connected by laser welding. Metal particles are generated in the process of laser welding. If the metal particles fall into the battery cell, the self-discharge problem of the battery cell may occur, thereby affecting the safety of the battery cell. UTILITY MODEL CONTENT

[0004] The technical problem solved by the present application is to provide a battery monomer and a power-using device, which solves the influence of metal particles generated in the connection process of the adapter piece and the top cover assembly of the existing battery monomer by welding on the safety of the battery cell.

[0005] To solve the above technical problems, the first technical solution adopted by the present application is to provide a battery monomer, which comprises a top cover assembly, an electrode assembly, an adapter piece and a connecting piece. The top cover assembly comprises a cover body and an electrode terminal mounted on the cover body. The electrode assembly is arranged on one side of the top cover assembly, and comprises a pole piece and a tab connected with the pole piece. The adapter piece is arranged between the top cover assembly and the electrode assembly. The adapter piece comprises a first connecting part and a second connecting part. The first connecting part is connected with the electrode terminal, and the second connecting part is connected with the tab. The connecting piece is arranged on the side of the adapter piece away from the top cover assembly, and the orthographic projection of the connecting piece on the adapter piece covers the first connecting part and the second connecting part is arranged in a staggered manner. The connecting piece is connected with the cover body. The connecting piece comprises a support plate and a glue layer arranged on the surface of the support plate close to the first connecting part. The glue layer is attached to the surface of the first connecting part.

[0006] In the embodiment, the connecting piece comprises a support plate and a glue layer arranged on the support plate. The orthographic projection of the connecting piece on the adapter piece covers the first connecting part of the adapter piece, and the glue layer is attached to the surface of the first connecting part of the adapter piece. Therefore, the glue layer covers and adsorbs the particles and foreign matters around the laser welding mark between the first connecting part and the electrode terminal, thereby playing a certain cleaning role on the electrode assembly, reducing the probability of self-discharge and internal short circuit in the electrode assembly. The height and size of the glue layer are fixed on the support plate, which solves the problem of glue overflow and uncontrollable height, thereby reducing the damage of glue overflow to the electrode assembly. At the same time, the glue layer can be quickly pasted with the top cover assembly without high-temperature melting, which reduces the wire drawing during the curing process of the hot melt glue and reduces the probability of welding burst caused by the welding of the top cover assembly.

[0007] In some embodiments, the cover body has two sets of protruding posts arranged opposite to each other, the protruding posts are provided with a first connecting structure, and the connector is provided with a second connecting structure. The first connecting structure and the second connecting structure are arranged in a one-to-one correspondence and fit together; the second connecting structure is located between the two sets of protruding posts.

[0008] In this embodiment, the cover body includes protrusions with a first connecting structure, and the connector has a second connecting structure that corresponds to and cooperates with the first connecting structure. The first and second connecting structures cooperate to achieve direct connection between the connector and the cover body. This direct connection strengthens the fixation of the connector and the top cover assembly. The mechanical nesting structure between the first and second connecting structures reduces the probability of the connector detaching, which in turn reduces the probability of the adhesive layer of the connector detaching under long-term immersion in electrolyte, thus improving the safety performance of the battery cell. Furthermore, the second connecting structure is located between the two sets of protrusions, which limit the position of the adapter located between the connector and the cover body, reducing the probability of large-scale displacement of the adapter.

[0009] In some embodiments, the distance between the oppositely arranged protrusions is a first spacing; the first connecting portion includes a first side and a second side arranged oppositely along the arrangement direction of the oppositely arranged protrusions, and the spacing between the first side and the second side is a second spacing; the first spacing and the second spacing are equal.

[0010] In this embodiment, the first spacing and the second spacing are equal, and the two sets of protruding pillars arranged opposite each other restrict the left and right movement of the connecting part of the adapter, maintain the positional consistency of the connecting part of the adapter, and maintain the stability and long-term effectiveness of the electrical connection between the electrode assembly and the electrode terminal.

[0011] In some embodiments, the support plate includes a main plane of the support plate and two sets of protrusions disposed opposite to each other on the main plane of the support plate, the protrusions being provided with a second connecting structure; the main plane of the support plate is completely covered with an adhesive layer.

[0012] In this embodiment, the support plate includes a main plane of the support plate, which is completely covered by an adhesive layer. The adhesive layer completely covers the solder area where the adapter and the electrode terminal are welded, adsorbs metal particles, and minimizes the probability of internal self-discharge and internal short circuit of the electrode assembly caused by metal particles.

[0013] In some embodiments, the main plane of the support plate includes a first side, a second side, a third side, and a fourth side arranged sequentially, which enclose the main plane of the support plate. The first side and the third side are arranged opposite to each other, and the second side and the fourth side are arranged opposite to each other. A protrusion is arranged along the extension direction of the first side, and the two opposite end faces of the protrusion are respectively flush with the second side and the fourth side. Another protrusion is arranged along the extension direction of the third side, and the two opposite end faces of the protrusion are respectively flush with the second side and the fourth side.

[0014] In this embodiment, the main plane of the support plate is formed by the first side, the second side, the third side and the fourth side. One protrusion is set along the extension direction of the first side, and another protrusion is set along the extension direction of the third side. The two opposite end faces of the protrusions are flush with the second side and the fourth side, which is conducive to forming a support plate of fixed size. When it is pasted and connected with the adapter, it can achieve a good limiting effect on the adapter.

[0015] In some embodiments, the two sets of protrusions and the main plane of the support plate enclose an internal space, the surface of the protrusions facing the internal space is the inner surface, and the inner surface of the protrusions is at least partially covered with an adhesive layer.

[0016] In this embodiment, the inner surfaces of the two sets of protrusions are at least partially covered with an adhesive layer, which can further strengthen the fixation of the connector and the adapter. The adhesive layer on the inner surface of the protrusions can also adsorb particulate residues on the adapter, thus cleaning the electrode assembly.

[0017] In some embodiments, the support plate includes a main plane of the support plate, and a second connecting structure is provided on the main plane of the support plate.

[0018] In this embodiment, the orthographic projection of the connector on the adapter covers the first connecting portion, meaning the area of ​​the main plane of the support plate is relatively large. The adhesive layer on the main plane of the support plate covers the first connecting portion. A second connecting structure is provided in the empty area of ​​the support plate that does not cover the first connecting portion. The second connecting structure corresponds one-to-one with the first connecting structure on the protrusion of the cover body and is configured to achieve direct connection between the connector and the cover body. Direct connection between the connector and the cover body helps to strengthen the fixation of the connector and the top cover assembly. Under the fixation of the mechanical nesting structure between the first and second connecting structures, the probability of the connector falling off is reduced, which helps to reduce the probability of the adhesive layer of the connector falling off under long-term immersion in electrolyte, and helps to improve the safety performance of the battery cell.

[0019] In some embodiments, the cover body includes a cover plate and an insulating member disposed on the side of the cover plate near the adapter; the insulating member is provided with a first connecting structure.

[0020] In this embodiment, the cover body is provided with an insulating component on the side near the adapter, and two sets of protrusions are provided on the insulating component. The protrusions are provided with a first connecting structure to fix the top cover assembly and the connector, reduce the probability of the connector falling off, and help reduce the probability of the adhesive layer of the connector falling off under long-term immersion in electrolyte, which is beneficial to improving the safety performance of the battery cell.

[0021] In some embodiments, one of the first connecting structure and the second connecting structure is a hook, and the other of the first connecting structure and the second connecting structure is a slot.

[0022] In this embodiment, one of the first and second connecting structures is a hook, and the other is a hole. The hook and hole are configured to correspond and cooperate with each other, so as to realize the direct connection between the connector and the cover body. The direct connection between the connector and the cover body helps to strengthen the fixation of the connector and the top cover assembly. Under the fixation of the mechanical nesting structure between the first and second connecting structures, the probability of the connector falling off is reduced, which helps to reduce the probability of the adhesive layer of the connector falling off under long-term immersion in electrolyte, and helps to improve the safety performance of the battery cell.

[0023] In some embodiments, the connector further includes two sets of protrusions disposed opposite to each other on the surface of the support plate, and the surface of the cover body is provided with a groove, the protrusions being engaged with the groove; the first connecting part is disposed between the two sets of protrusions.

[0024] In this embodiment, the connector includes a support plate, an adhesive layer on the surface of the support plate near the first connecting portion, and two sets of opposing protrusions on the surface of the support plate. The adapter includes a first connecting portion, which connects to the electrode terminals on the cover body. Simultaneously, a slot is provided on the side of the cover body facing the connector. The protrusions on the support plate surface and the slot on the cover body cooperate with each other, enabling direct connection between the connector and the cover body. This direct connection strengthens the fixation of the connector and the top cover assembly. The mechanical nesting structure between the protrusions and the slot reduces the probability of the connector detaching, thus lowering the connector's profile. Furthermore, the first connecting portion is located between the two sets of protrusions, which provide a certain limiting effect on the adapter positioned between the connector and the cover body, reducing the probability of large-scale displacement of the adapter.

[0025] To address the aforementioned technical problems, the second technical solution provided in this application is: to provide an electrical device comprising a device body and a battery device, wherein the battery device is disposed in the device body and comprises the aforementioned battery cells. Since the electrical device includes the aforementioned battery cells, it has the same effect as the aforementioned battery cells. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0027] Figure 1 This is a structural schematic diagram of the electrical equipment provided in this application;

[0028] Figure 2 This is a schematic diagram of the battery device provided in this application;

[0029] Figure 3 This is a schematic diagram of the structure of the battery cell provided in this application;

[0030] Figure 4 This is a structural schematic diagram of the connector provided in this application;

[0031] Figure 5 This is a schematic diagram of the structure of the cover body provided in this application;

[0032] Figure 6 This is a structural schematic diagram of the assembly of the cover body, adapter, and connector provided in this application;

[0033] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure along the YY direction;

[0034] Figure 8 This is a schematic diagram of another embodiment of the connector provided in this application;

[0035] Figure 9 This is a schematic diagram of another embodiment of the cover body and connector provided in this application.

[0036] In the diagram: 1. Battery assembly; 10. Battery housing; 101. Upper housing; 102. Lower housing; 11. Top cover assembly; 12. Adapter; 13. Connector; 111. Cover body; 112. Electrode terminal; 121. First connecting part; 122. Second connecting part; 131. Support plate; 132. Adhesive layer; 14. Electrode assembly; 142. Tab; 15. Battery cell; 151. Housing; 152. Safety valve; 113. Protrusion. 114. First connecting structure; 133. Second connecting structure; X1. First spacing; X2. Second spacing; 1311. Main plane of support plate; 1322. Protrusion; 1311a. First side; 1311b. Second side; 1311c. Third side; 1311d. Fourth side; A. First position; B. Second position; 1322c. Inner surface; 1112. Insulating component; 134. Protrusion; 135. Slot; 2. Equipment body. Detailed Implementation

[0037] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0038] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices can be power batteries, which provide power to tools and vehicles, such as electric cars, electric trains, electric bicycles, golf carts, and aerospace equipment. Of course, battery devices can also be energy storage batteries, which are used to store energy from renewable energy sources such as hydroelectric, thermal, wind, and solar power plants. As the application areas of battery devices continue to expand, the market demand is also constantly increasing.

[0043] In a battery cell of a battery assembly, an adapter plate connects the cell's tabs to the electrode terminals of the top cover assembly. The connection between the adapter plate and the top cover assembly's electrode terminals is typically achieved using laser welding. However, this laser welding process generates metal particles. If these particles fall into the cell, they may cause self-discharge, thus affecting the cell's safety.

[0044] For metal particles generated during laser welding, related technologies use high-temperature hot melt adhesive to be dripped onto the welding stamp surface of the adapter plate to cover the metal particles formed after welding. The problems with this treatment method are: the morphology and height of the molten adhesive after high temperature cannot be controlled due to the casting process; the ultra-high adhesive block after curing can damage the battery cell after the bare cell is assembled into the casing; in addition, the curing of the molten adhesive after high temperature requires a certain amount of time, and stringing may form in contact with the isolation membrane and the edge of the adapter plate during the curing process, which may interfere with the welding of the top cover assembly and cause welding bursts; and there is a risk of the adhesive block falling off after long-term immersion in the electrolyte.

[0045] In view of this, this application provides a battery cell and an electrical device to reduce the impact of metal particles generated during the welding process of the battery cell's adapter and top cover assembly on the cell's safety.

[0046] An embodiment of this application provides an electrical device, see [link to embodiment]. Figure 1 The electrical equipment may include a main body 2 and a battery device 1, with the battery device 1 disposed on the main body 2. The battery device 1 is used to supply power to the electrical components of the main body 2, enabling the main body 2 to operate.

[0047] Electrical devices can be components that can use electricity; for example, electrical devices can be controllers and electronic components, and the controller can be a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0048] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. 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. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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. For ease of explanation, the following examples use vehicles as an example of electrical equipment.

[0049] In some examples, the electrical equipment can be a vehicle, the main body 2 can be a frame, and the battery device 1 is mounted on the frame. The electrical components can be vehicle lights (e.g., headlights, taillights, etc.), displays, dashboards, control systems (e.g., controllers), etc. The electrical components are mounted on the vehicle body.

[0050] See Figure 2 The battery device 1 may further include a battery housing 10; the battery housing 10 has a cavity in which multiple battery cells 15 are housed; the battery housing 10 serves to protect the battery cells 15 and also facilitates the assembly of multiple battery cells 15 together. In some examples, the battery housing 10 may include an upper housing 101 and a lower housing 102, with the upper housing 101 covering the lower housing 102.

[0051] See Figure 3 The battery cell 15 can be a rechargeable battery, which refers to a battery cell 15 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 15 can be, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0052] The battery cell 15 may include a housing 151, an electrode assembly 14, and a top cover assembly 11. The housing 151 has a communicating cavity and a mounting port. The number of electrode assemblies 14 may be one or more; the electrode assemblies 14 are mounted within the cavity of the housing 151. The top cover assembly 11 is connected to the housing 151 and covers the mounting port. The housing 151 is filled with an electrolyte, such as a liquid electrolyte solution. The housing 151 is a hollow structure, and the material of the housing 151 may be metal or plastic; for example, the material of the housing 151 may be copper, iron, aluminum, steel, aluminum alloy, etc.

[0053] The electrode assembly 14 may include a negative electrode and a positive electrode, as well as a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 15, active ions (such as lithium ions) repeatedly insert and extract between the negative electrode and the positive electrode. The separator can, to a certain extent, prevent short circuits between the negative electrode and the positive electrode, while allowing active ions to pass through.

[0054] The battery cell 15 may also include a safety valve 152 (also known as a pressure relief valve). The safety valve 152 may be disposed on the top cover assembly 11, for example, the safety valve 152 may be fixed to the top cover assembly 11. The safety valve 152 is used to release the internal electrolyte when the internal pressure or temperature of the battery cell 15 reaches a threshold, thereby reducing the internal pressure or temperature of the battery cell 15. For example, the safety valve 152 may be a temperature-sensitive valve, a pressure-sensitive valve, etc.

[0055] The battery cell 15 may further include electrode terminals 112 and adapters 12. Two electrode terminals 112 may be disposed on the cover body 111, representing a positive electrode terminal and a negative electrode terminal, respectively. Each electrode terminal 112 is correspondingly connected to one adapter 12. The adapter 12 is located between the top cover assembly 11 and the electrode assembly 14, and is used to electrically connect the electrode assembly 14 and the electrode terminals 112. The electrode terminals 112 may refer to conductive components outside the battery cell 15, used to connect to the positive and negative terminals of the internal electrode assembly 14 of the battery cell 15, and to provide an interface for current flow outside the battery cell 15. The electrode terminals 112 may be metal sheets or metal rods, and the material may include, but is not limited to, copper, aluminum, or other metals with good conductivity. The cross-section of the electrode terminals 112 may include, but is not limited to, rectangular, circular, and elliptical shapes.

[0056] The adapter 12 of the battery cell 15 is generally composed of a sheet-like metal structure with good conductivity. Typically, the adapter 12 is divided into a terminal connection area (hereinafter referred to as the first connection portion 121) that connects to the electrode terminals 112 via laser or other methods. This area can be sheet-like or convex, and may be square or circular. Another part is a connection area that connects to the tabs 142 (hereinafter referred to as the second connection portion 122), generally connected via ultrasonic waves or other methods. This area can be planar, and may be square or irregularly round / square. The production process typically involves connecting the terminal connection area (first connection portion 121) to the electrode terminals 112, and the tab connection area (second connection portion 122) to the tabs. First, the terminal connection area is aligned with the electrode terminals 112, then the tab connection area is connected to the tabs, and finally, the terminal connection area (first connection portion 121) is connected via laser, creating a reliable and complete adapter 12 that conducts electricity from the bare cell to the cell electrode terminals 112.

[0057] ReferenceFigure 2 , Figure 3 The battery cell 15 provided in this application embodiment includes a top cover assembly 11, an adapter 12, and a connector 13. The top cover assembly 11 includes a cover body 111 and electrode terminals 112 mounted on the cover body 111. An electrode assembly 14 is disposed on one side of the top cover assembly 11, and the electrode assembly 14 includes an electrode sheet and an electrode tab 142 connected to the electrode sheet. The adapter 12 is disposed between the top cover assembly 11 and the electrode assembly 14. The adapter 12 includes a first connecting portion 121 and a second connecting portion 122. The first connecting portion 121... The first connecting part 122 is connected to the electrode terminal 112, and the second connecting part 122 is connected to the electrode tab 142; the connecting part 13 is disposed on the side of the adapter 12 away from the top cover assembly 11, and the orthographic projection of the connecting part 13 on the adapter 12 covers the first connecting part 121 and is offset from the second connecting part 122; the connecting part 13 is connected to the cover body 111; the connecting part 13 includes a support plate 131 and an adhesive layer 132 disposed on the support plate 131 near the surface of the first connecting part 121, and the adhesive layer 132 is attached to the first connecting part 121.

[0058] In this embodiment, the connector 13 includes a support plate 131 and an adhesive layer 132 disposed on the support plate 131. The orthographic projection of the connector 13 onto the adapter 12 covers the first connecting portion 121 of the adapter 12. Simultaneously, the adhesive layer 132 adheres to the surface of the first connecting portion 121 of the adapter 12 facing the connector 13. Thus, the adhesive layer 132 covers the laser weld marks of the welding portion between the first connecting portion 121 and the electrode terminal 112 and adsorbs particulate matter around the laser weld marks, thereby achieving a certain cleaning effect on the electrode assembly 14 and reducing the probability of internal self-discharge and internal short circuits in the electrode assembly 14. The height and size of the adhesive layer 132 are fixed on the support plate 131, solving the problems of glue overflow and uncontrollable height, thereby reducing the damage of overflow glue to the electrode assembly 14. At the same time, the adhesive layer 132 can be quickly bonded to the top cover assembly 11 without high-temperature melting, reducing stringing during the hot melt adhesive curing process and lowering the probability of weld bursts caused by welding of the top cover assembly 11.

[0059] In this embodiment of the application, by setting the connector 13 to be connected to the cover body 111, the probability of the connector 13 falling off is reduced, which also reduces the probability of the adhesive layer 132 of the connector 13 falling off under long-term immersion in the electrolyte, which is beneficial to improving the safety performance of the battery cell.

[0060] The electrode assembly 14 is located on the side of the connector 13 away from the top cover assembly 11. The electrode assembly 14 includes an electrode sheet and an electrode tab 142 connected to the electrode sheet. The adapter 12 also includes a second connecting part 122. The orthographic projection of the adhesive layer 132 of the connector 13 onto the adapter 12 covers the first connecting part 121. The first connecting part 121 and the second connecting part 122 are misaligned. The connector 13 and / or the first connecting part 121 do not interfere with the connection between the second connecting part 122 and the electrode tab 142.

[0061] It should be noted that the structure of the adapter 12 in this application is not limited to the structure shown in the figure.

[0062] In some embodiments, refer to Figure 4 , Figure 5 and Figure 6 The cover body 111 has two sets of protruding posts 113 arranged opposite to each other. The protruding posts 113 are provided with a first connecting structure 114, and the connector 13 is provided with a second connecting structure 133. The first connecting structure 114 and the second connecting structure 133 are arranged in a one-to-one correspondence and fit together. The first connecting part 121 of the adapter 12 is located between the two sets of protruding posts 113.

[0063] The first connecting structure 114 is a structural component that connects the cover body 111 to the connector 13.

[0064] In this embodiment, the cover body 111 includes protrusions 113 with a first connecting structure 114, and the connector 13 is provided with a second connecting structure 133 that corresponds to and cooperates with the first connecting structure 114. After the first connecting structure 114 and the second connecting structure 133 cooperate, the connector 13 is directly connected to the cover body 111. The direct connection between the connector 13 and the cover body 111 helps to strengthen the fixation of the connector 13 and the top cover assembly 11. Under the fixation of the mechanical nesting structure between the first connecting structure 114 and the second connecting structure 133, the probability of the connector 13 falling off is reduced, which helps to reduce the probability of the adhesive layer of the connector falling off under long-term immersion in electrolyte, and helps to improve the safety performance of the battery cell. Furthermore, the second connecting structure 133 is disposed between the two sets of protrusions 113. The two sets of protrusions 113 have a certain limiting effect on the adapter 12 disposed between the connector 13 and the cover body 111, reducing the probability of the adapter 12 shifting position over a large range.

[0065] It should be noted that the number of protrusions 113 in each group can be one or more, depending on the specific design requirements. Optionally, if there is only one protrusion 113 in each group, the cover body 111 includes a region for connecting with the adapter 12, the outline of which is rectangular, and the protrusion 113 is located on one side of the rectangle and at the center of that side. Optionally, if there are multiple protrusions 113 in each group, the cover body 111 includes a region for connecting with the adapter 12, the outline of which is rectangular, and multiple protrusions 113 are located on each of the two opposite sides of the rectangle.

[0066] In some embodiments, refer to Figure 5 The distance between the relatively positioned protrusions 113 is the first spacing X1; refer to Figure 6 and Figure 7 , Figure 7 for Figure 6 A cross-sectional diagram along the YY direction. Figure 6 In the middle, the first connecting part 121 includes a first side and a second side arranged opposite to each other along the arrangement direction of the oppositely arranged protrusions 113. The distance between the first side and the second side is a second spacing X2, and the first spacing X1 and the second spacing X2 are equal.

[0067] In this embodiment, the first spacing X1 and the second spacing X2 are equal. The two sets of protrusions 113 arranged opposite to each other restrict the left and right movement of the connecting part of the adapter 12, maintain the positional consistency of the connecting part of the adapter 12, and maintain the stability and long-term effectiveness of the electrical connection between the electrode assembly 14 and the electrode terminal 112.

[0068] In some embodiments, in conjunction with reference Figure 4 The support plate 131 includes a main plane 1311 and two sets of protrusions 1322 disposed opposite to each other on the main plane 1311. The protrusions 1322 are provided with a second connecting structure 133. The main plane 1311 of the support plate is completely covered with an adhesive layer 132.

[0069] In this embodiment, the support plate 131 includes a main plane 1311, which is completely covered by an adhesive layer 132. The adhesive layer 132 completely covers the solder area where the adapter 12 and the electrode terminal 112 are welded, adsorbing metal particles and minimizing the probability of internal self-discharge and internal short circuit of the electrode assembly 14 caused by metal particles.

[0070] Optionally, the main plane 1311 and the protrusion 1322 of the support plate can be integrally molded for easy assembly. For example, the main plane 1311 and the protrusion 1322 of the support plate can be integrally molded using injection molding.

[0071] In some embodiments, continue to refer to Figure 4The main plane 1311 of the support plate includes a first side 1311a, a second side 1311b, a third side 1311c, and a fourth side 1311d arranged sequentially. The first side 1311a, the second side 1311b, the third side 1311c, and the fourth side 1311d enclose each other to form the main plane 1311 of the support plate. The first side 1311a and the third side 1311c are arranged opposite each other, and the second side 1311b and the fourth side 1311d are arranged opposite each other. A protrusion 1322 is arranged along the extension direction of the first side 1311a, and the two opposite end faces of the protrusion 1322 are flush with the second side 1311b and the fourth side 1311d, respectively. Another protrusion 1322 is arranged along the extension direction of the third side 1311c, and the two opposite end faces of the protrusion 1322 are flush with the second side 1311b and the fourth side 1311d, respectively.

[0072] In this embodiment, the main plane 1311 of the support plate is formed by the first side 1311a, the second side 1311b, the third side 1311c, and the fourth side 1311d. One protrusion 1322 is arranged along the extension direction of the first side 1311a, and another protrusion 1322 is arranged along the extension direction of the third side 1311c. The two opposite end faces of the protrusion 1322 are flush with the second side 1311b and the fourth side 1311d, respectively. The other protrusion 1322 is arranged along the extension direction of the third side 1311c, and the two opposite end faces of the protrusion 1322 are flush with the second side 1311b and the fourth side 1311d, respectively. This facilitates the formation of a support plate 131 of a fixed size, which can achieve a good limiting effect on the adapter 12 when it is glued and connected to it.

[0073] In addition, one of the protrusions 1322 is disposed at a first position A on the main plane 1311 of the support plate along the extension direction of the first side 1311a, and the other protrusion 1322 is disposed at a second position B on the main plane 1311 of the support plate along the extension direction of the third side 1311c. The distance between the first position A and the second position B can be equal to or less than the distance between the first side 1311a and the third side 1311c, and is not limited here.

[0074] In some embodiments, the two sets of protrusions 1322 and the main plane 1311 of the support plate enclose an internal space, the surface of the protrusions 1322 facing the internal space is the inner surface 1322c, and the inner surface 1322c of the protrusions 1322 is at least partially covered by an adhesive layer 132.

[0075] In this embodiment, refer to Figure 5The inner surfaces 1322c of the two sets of protrusions 1322 are at least partially covered with an adhesive layer 132, which can further strengthen the fixation between the connector 13 and the adapter 12. The adhesive layer 132 on the inner surfaces 1322c of the protrusions 1322 can also adsorb particulate residue on the adapter 12, thus cleaning the electrode assembly 14. The length of the adhesive layer 132 covering the inner surface 1322c is equal to the length of the first side 1311a and the third side 1311c.

[0076] It should be noted that the adhesive layer 132 covering the inner surface 1322c avoids the second connecting structure 133 on the protrusion 1322.

[0077] In one embodiment, in conjunction with reference to Figure 6 and Figure 7 When the connector 13 is connected to the top cover assembly 11, the protrusion 1322 is located on the side of the protrusion 113 away from the adapter 12. The protrusion 1322 and the protrusion 113 together provide a good limiting effect on the adapter 12.

[0078] In some embodiments, refer to Figure 8 The support plate 131 includes a main plane 1311, and a second connecting structure 133 is provided on the main plane 1311.

[0079] In this embodiment, the orthographic projection of the connector 13 onto the adapter 12 covers the first connecting portion 121, meaning the area of ​​the main plane 1311 of the support plate is relatively large. The adhesive layer 132 on the main plane 1311 of the support plate covers the first connecting portion 121. A second connecting structure 133 is provided in the empty area of ​​the support plate 131 that does not cover the first connecting portion 121. The second connecting structure 133 corresponds one-to-one with the first connecting structure 114 on the protrusion 113 of the cover body 111 and is configured to achieve direct connection between the connector 13 and the cover body 111. Direct connection between the connector 13 and the cover body 111 helps to strengthen the fixation of the connector 13 and the top cover assembly 11. Under the fixation of the mechanical nesting structure between the first connecting structure 114 and the second connecting structure 133, the probability of the connector 13 falling off is reduced, which helps to reduce the probability of the adhesive layer of the connector falling off under long-term immersion in the electrolyte, and helps to improve the safety performance of the battery cell.

[0080] In some embodiments, refer to Figure 5 The cover body 111 includes a cover plate and an insulating member 1112 disposed on the side of the cover plate near the adapter 12; the insulating member 1112 is provided with a first connecting structure 114.

[0081] In this embodiment, the cover body 111 is provided with an insulating member 1112 on the side near the adapter 12, and two sets of protrusions 113 are provided on the insulating member 1112. The protrusions 113 are provided with a first connecting structure 114 to fix the top cover assembly 11 and the connector 13, reduce the probability of the connector 13 falling off, and help reduce the probability of the adhesive layer 132 of the connector 13 falling off under long-term immersion in electrolyte, which is beneficial to improving the safety performance of the battery cell.

[0082] Optionally, the protrusion 113 and the insulating part 1112 can be integrally molded, for example, by injection molding, so that the protrusion 113 and the insulating part 1112 can be integrally molded, which is convenient for assembly.

[0083] In some embodiments, one of the first connecting structure 114 and the second connecting structure 133 is a hook, and the other of the first connecting structure 114 and the second connecting structure 133 is a slot.

[0084] In this embodiment, one of the first connecting structure 114 and the second connecting structure 133 is a hook, and the other of the first connecting structure 114 and the second connecting structure 133 is a hole. The hook and the hole are arranged in a one-to-one correspondence and fit together to realize the direct connection between the connector 13 and the cover body 111. The direct connection between the connector 13 and the cover body 111 helps to strengthen the fixation of the connector 13 and the top cover assembly 11. Under the fixation of the mechanical nesting structure between the first connecting structure 114 and the second connecting structure 133, the probability of the connector 13 falling off is reduced, which helps to reduce the probability of the adhesive layer 132 of the connector 13 falling off under long-term immersion in the electrolyte, and helps to improve the safety performance of the battery cell.

[0085] In some embodiments, refer to Figure 9 The connector 13 also includes two sets of protrusions 134 disposed opposite to each other on the surface of the support plate 131, and the cover body 111 is provided with a slot 135, the protrusions 134 and the slot 135 are engaged; the first connecting part 121 is disposed between the two sets of protrusions 134.

[0086] In this embodiment, the connector 13 includes a support plate 131, an adhesive layer 132 disposed on the surface of the support plate 131 near the first connecting portion 121, and two sets of protrusions 134 disposed opposite to each other on the surface of the support plate 131. The adapter 12 includes a first connecting portion 121, which is connected to the electrode terminal 112 on the cover body 111. At the same time, the cover body 111 has a slot 135 on the side facing the connector 13. After the protrusions 134 on the surface of the support plate 131 and the slot 135 on the cover body 111 are mutually engaged, the connector 13 is directly connected to the cover body 111. The direct connection between the connector 13 and the cover body 111 helps to strengthen the fixation of the connector 13 and the top cover assembly 11. Under the fixation of the mechanical nesting structure between the protrusions 134 and the slot 135, the probability of the connector 13 falling off is reduced, which helps to reduce the probability of the adhesive layer 132 of the connector 13 falling off under long-term immersion in electrolyte, and helps to improve the safety performance of the battery cell. Furthermore, the first connecting part 121 is located between the two sets of protrusions 134. The two sets of protrusions 134 have a certain limiting effect on the adapter 12 located between the connector 13 and the cover body 111, reducing the probability of the adapter 12 shifting position over a large range.

[0087] The above description is merely an embodiment of this application and does not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A battery cell, characterized by, The application relates to a battery top cover assembly. The battery top cover assembly comprises a top cover assembly, an electrode assembly and a connector. The top cover assembly comprises a top cover body and an electrode terminal mounted on the top cover body. The electrode assembly is arranged on one side of the top cover assembly and comprises a tab and a lug connected with the tab. The connector is arranged on the side of the adapter away from the top cover assembly, and the orthographic projection of the connector on the adapter covers the first connecting part and is arranged in a staggered mode with the second connecting part.

2. The battery cell of claim 1, wherein, The connector is connected with the top cover body. The top cover body has two groups of protruding columns arranged oppositely, the protruding columns are provided with first connecting structures, the connector is provided with second connecting structures, the first connecting structures and the second connecting structures are arranged in a one-to-one corresponding mode, and the first connecting structures and the second connecting structures are arranged in a matched mode.

3. The battery cell of claim 2, wherein, The first connecting part is arranged between the two groups of protruding columns.

4. The battery cell according to claim 2 or 3, characterized in that, The distance between the oppositely arranged protruding columns is a first interval. The first connecting part comprises oppositely arranged first and second side edges along the arrangement direction of the oppositely arranged protruding columns.

5. The battery cell of claim 4, wherein, The first interval is equal to the second interval. The support plate comprises a support plate main plane and two groups of protruding parts arranged oppositely on the support plate main plane.

6. The battery cell of claim 4, wherein, The support plate main plane is completely covered with the adhesive layer.

7. The battery cell according to claim 2 or 3, characterized in that, The support plate main plane comprises a first edge, a second edge, a third edge and a fourth edge arranged in sequence.

8. The battery cell of claim 2, wherein, One of the protruding parts is arranged along the extension direction of the first edge, and the opposite end faces of the protruding part are flush with the second edge and the fourth edge respectively.

9. The battery cell of claim 2, wherein, The other protruding part is arranged along the extension direction of the third edge, and the opposite end faces of the protruding part are flush with the second edge and the fourth edge respectively.

10. The battery cell of claim 1, wherein, The two groups of protruding parts and the support plate main plane form an internal space. The support plate comprises a support plate main plane, and the support plate main plane is provided with the second connecting structures.

11. An electrical device, characterized by The top cover body comprises a cover plate and an insulating part arranged on the side of the cover plate close to the adapter. One of the first connecting structures and the second connecting structures is a hook, and the other is a clamping hole. The connector further comprises two groups of protruding parts arranged oppositely on the surface of the support plate. The top cover body surface is provided with a clamping groove, and the protruding parts and the clamping groove are arranged in a matched mode. The first connecting part is arranged between the two groups of protruding parts. An apparatus main body and a battery device provided to the apparatus main body, the battery device including the battery cell according to any one of claims 1 to 10.

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