Battery and battery device

Abstract

This application relates to the field of battery technology, and more particularly to a battery and battery device. The battery includes: a cover assembly, which includes a cover and terminals. The cover has a first end face and a second end face opposite to each other, and the terminals are fixedly connected to the cover; a cell, which includes a body and tabs connected to the body. The tabs and terminals are electrically connected via an adapter. The tabs are connected to the adapter via a first solder mark, and the terminals are connected to the adapter via a second solder mark. In the width direction of the cover, the projections of the first solder mark and the second solder mark at least partially overlap. An insulating element is provided between the adapter and the second end face. By ensuring that the projections of the first solder mark and the second solder mark at least partially overlap, the current transmission path is improved, the internal resistance is effectively reduced, and the high power output and fast charging capability of the battery are significantly improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery and a battery device. Background Technology

[0002] With the rapid development of battery technology, people have put forward higher requirements for battery energy density, fast charging capability, and high-rate charge and discharge performance.

[0003] However, due to the high internal resistance of the existing battery's electrical connectors, the high current charging during fast charging will cause significant Joule heating inside the battery, resulting in severe battery overheating and affecting user experience and safety. Summary of the Invention

[0004] This application provides a battery and battery device that can reduce resistance, thereby improving the user experience.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] On one hand, this application provides a battery, comprising:

[0007] A cover plate assembly, comprising a cover plate and an electrode post, wherein the cover plate has a first end face and a second end face opposite to each other, and the electrode post is fixedly connected to the cover plate;

[0008] The battery cell includes a body and a tab connected to the body. The tab and the terminal are electrically connected through an adapter. The tab is connected to the adapter through a first solder mark, and the terminal is connected to the adapter through a second solder mark.

[0009] Along the length of the cover plate, the distance between the side of the first solder mark closest to the end of the adjacent cover plate and the side of the electrode lug furthest from the cover plate is K mm.

[0010] In the width direction of the cover plate, the projection of the first solder mark and the projection of the second solder mark at least partially overlap, and the size of the overlapping area is K1mm, K-K1=x;

[0011] An insulating component is provided between the adapter and the second end face.

[0012] The electrode tabs include positive and negative electrode tabs spaced apart along the length of the cover plate, with a spacing of D mm between the positive and negative electrode tabs.

[0013] x and D satisfy: 0.032≤x / D≤4.565.

[0014] On the other hand, this application provides a battery device including a conductive bus and the aforementioned batteries, wherein the conductive bus is electrically connected to the terminals of at least two batteries.

[0015] The battery and battery device provided in this application shorten the current transmission path from the tabs through the adapter to the terminals by at least partially overlapping the projections of the first and second solder marks in the width direction, thus reducing the path resistance caused by current detours and improving the current transmission path. This directly and effectively reduces the overall internal resistance of the battery, significantly reducing Joule heat generated by internal resistance during high-current fast charging, thereby alleviating the problem of temperature rise during fast charging and improving fast charging efficiency and user experience. Simultaneously, by precisely controlling the spacing distance D between the positive and negative tabs and establishing a correlation with the aforementioned overlap dimension and the parameters of the first and second solder marks, x / D is kept within a certain range. This avoids excessive local heat concentration caused by the close proximity of the positive and negative tabs, effectively dispersing the heat-generating area, preventing thermal runaway, and improving the safety and reliability of the battery during fast charging. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0018] Figure 2 for Figure 1 One of the partial exploded structural diagrams of the battery shown;

[0019] Figure 3 for Figure 1 The second partially exploded structural diagram of the battery shown;

[0020] Figure 4 for Figure 1 One of the schematic diagrams of a partial structure of the battery shown;

[0021] Figure 5 for Figure 1 The second schematic diagram of a partial structure of the battery shown;

[0022] Figure 6 for Figure 1 The diagram shows part of the battery's structure (3).

[0023] Figure 7 for Figure 1 One of the structural schematic diagrams of the adapter and tabs of the battery shown;

[0024] Figure 8 for Figure 1The second schematic diagram of the adapter and tabs of the battery shown;

[0025] Figure 9 for Figure 1 The third schematic diagram of the adapter and tab structure of the battery shown;

[0026] Figure 10 for Figure 1 One of the schematic diagrams of the battery cell shown;

[0027] Figure 11 for Figure 1 The second schematic diagram of the battery cell structure shown;

[0028] Figure 12 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100-Battery; 10-Cover assembly; 11-Cover; 111-First end face; 112-Second end face; 12-Terminal post; 20-Cell; 21-Body; 22-Taper; 221-Positive tab; 222-Negative tab; 223-Taper piece; 30-Adapter; 31-First solder mark; 311-First sub-solder mark; 312-Second sub-solder mark; 32-Second solder mark; 33-Notch; 331-Sub-notch; 40-Insulator; 50-Housing; 51-Accommodation space; 200-Battery assembly; 201-Conducting busbar. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] With the rapid development of battery technology, people have put forward higher requirements for battery energy density, fast charging capability, and high-rate charge and discharge performance.

[0033] However, due to the high internal resistance of the existing battery's electrical connectors, the high current charging during fast charging will cause significant Joule heating inside the battery, resulting in severe battery overheating and affecting user experience and safety.

[0034] To overcome the shortcomings of existing technologies, after repeated consideration and verification, the inventors discovered that the main factor causing high internal resistance in batteries lies in the soldering between the terminals and tabs. This is especially true when the positive and negative tabs are led out from the same side, leading to concentrated heat generation and a more severe increase in resistance. In existing technologies, the terminals and tabs are soldered together internally via adapter plates. To avoid interference between the tab and terminal soldering, the soldering is typically staggered. This staggered arrangement results in a longer current transmission path under high-rate charge / discharge conditions, increasing the overall battery resistance and the rate of internal heat generation, leading to excessively long charging times. If the solder marks of the tabs and adapter plates and the solder marks of the terminals and adapter plates are at least partially overlapped, the current transmission path can be reduced. However, the overlap of these two solder marks leads to concentrated heat generation during the welding process. Especially when the positive and negative tabs are located on the same side, the heat generated by multiple solder marks is even more concentrated. The insulating component located between the adapter and the cover plate may melt due to heat, posing a risk of short circuit inside the battery. To avoid the above problems, the size of a single tab is increased to better distribute the heat. However, the above arrangement also increases the risk of heat concentration and increased resistance during battery use. At the same time, by controlling the spacing between the positive and negative tabs, the overlap size of the solder marks, and the distance of the first solder mark from the end of the tab, it is possible to prevent the problem of concentrated heat generation and increased resistance in the entire cell due to the close distance between the positive and negative tabs. It also avoids the risk of short circuit inside the battery caused by melting of the insulating component during the welding process.

[0035] In view of the above, this application provides a battery, comprising:

[0036] A cover plate assembly, comprising a cover plate and an electrode post, wherein the cover plate has a first end face and a second end face opposite to each other, and the electrode post is fixedly connected to the cover plate;

[0037] The battery cell includes a body and a tab connected to the body. The tab and the terminal are electrically connected through an adapter. The tab is connected to the adapter through a first solder mark, and the terminal is connected to the adapter through a second solder mark.

[0038] Along the length of the cover plate, the distance between the side of the first solder mark closest to the end of the adjacent cover plate and the side of the electrode lug furthest from the cover plate is K mm.

[0039] In the width direction of the cover plate, the projection of the first solder mark and the projection of the second solder mark at least partially overlap, and the size of the overlapping area is K1mm, K-K1=x;

[0040] An insulating component is provided between the adapter and the second end face.

[0041] The electrode tabs include positive and negative electrode tabs spaced apart along the length of the cover plate, with a spacing of D mm between the positive and negative electrode tabs.

[0042] x and D satisfy: 0.032≤x / D≤4.565.

[0043] By ensuring that the projections of the first and second solder marks in the width direction at least partially overlap, forming an overlapping area, the transmission path of current from the tabs through the adapter to the terminals is shortened. This reduces the path resistance caused by current detours and improves the current transmission path, thereby directly and effectively reducing the overall internal resistance of the battery. This significantly reduces Joule heating caused by internal resistance during high-current fast charging, alleviating the problem of temperature rise during fast charging and improving fast charging efficiency and user experience. Simultaneously, by precisely controlling the spacing D between the positive and negative tabs and establishing a correlation with the aforementioned overlapping dimensions and the parameters of the first and second solder marks, x / D is kept within a certain range. This avoids excessive local heat concentration caused by the close proximity of the positive and negative tabs, effectively dispersing the heat-generating area, preventing thermal runaway, and improving the safety and reliability of the battery during fast charging.

[0044] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0045] The specific structure of the battery and various possible implementation methods are described in detail below.

[0046] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application. Figure 2 for Figure 1 One of the partial exploded structural diagrams of the battery shown. Figure 3 for Figure 1 The second schematic diagram shows a partially exploded structure of the battery. Figure 4 for Figure 1 One of the schematic diagrams of a partial structure of the battery shown. Figure 5 for Figure 1 The second schematic diagram shows a partial structure of the battery. Figure 6 for Figure 1 The third schematic diagram of a partial structure of the battery shown. Figure 7 for Figure 1 One of the schematic diagrams of the adapter and tabs of the battery shown. Figure 8 for Figure 1 The second schematic diagram of the adapter and tabs of the battery shown. Figure 9 for Figure 1 The third schematic diagram of the battery adapter and tabs shown. Figure 10 for Figure 1 One of the schematic diagrams of the battery cell shown. Figure 11 for Figure 1 The second schematic diagram of the battery cell shown. Figure 12 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application.

[0047] like Figure 1 and Figure 12 As shown in the embodiment of this application, the battery 100 is used in the battery device 200.

[0048] The battery 100 can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 100, after discharge, the active materials in the battery 100 can be activated by charging so that it can continue to be used.

[0049] In one possible implementation, battery 100 is a prismatic battery 100.

[0050] like Figure 2 and Figure 3 As shown, the battery 100 includes a cover assembly 10 and a battery cell 20. The cover assembly 10 includes a cover 11 and a terminal post 12. The terminal post 12 is fixedly connected to the cover 11 and electrically connected to the battery cell 20.

[0051] The cover plate 11 is a plate-shaped component used to install the pole post 12. Typically, the cover plate 11 has through holes for installing the pole post 12. The cover plate 11 can be a metal plate, such as a steel plate, aluminum plate, or titanium plate, integrally formed with the metal housing 50, or welded together. The cover plate 11 can also be a non-metallic plate, such as a plastic cover, connected to the housing 50 by injection molding, bonding, or other methods.

[0052] The cover plate 11 can be the encapsulation side of the battery 100, that is, the end cap of the battery 100. It is combined with the housing 50 by means of laser welding or edge sealing to seal the opening end of the housing 50 and achieve the final sealing of the battery 100.

[0053] In other words, the cover is a component that closes the opening of the casing to isolate the internal environment of the battery cell from the external environment.

[0054] The cover plate 11 is also usually equipped with an explosion-proof device, such as an explosion-proof valve. The cover plate 11 may also be provided with a liquid injection hole, which is sealed after liquid injection.

[0055] The cover plate 11 can also be other end faces of the battery 100.

[0056] The terminal 12 is an external electrical connection terminal of the battery 100, used to lead the internal current of the battery 100 to an external circuit, and typically includes a positive terminal and a negative terminal. One terminal 12 is connected to the positive tab 221 of the cell 20 and is insulatedly fixed to the cover plate 11, and this terminal 12 is usually the positive terminal; the other terminal 12 is connected to the positive tab 221 of the cell 20 and is insulatedly fixed to the cover plate 11, and this terminal 12 is usually the positive terminal.

[0057] Terminals are used to electrically connect electrode assemblies located inside the housing to external devices (adjacent batteries or other electrical equipment) located outside the housing. The battery can discharge to external devices through the cell output terminals (tabs) and the external device output terminals (terminals), and an external power source can charge the battery through the terminals and tabs. Terminals can be directly electrically connected to the cell tabs, or they can be electrically connected to the tabs through metal adapters.

[0058] The electrode post includes at least one of the following metals: copper, aluminum, aluminum alloy, copper-aluminum alloy, etc.

[0059] In one possible implementation, a limiting flange can be provided on the cover plate 11 to fix the terminal post 12 to the limiting flange. Alternatively, a limiting ring can be provided on the cover plate 11 to fix the top end of the terminal post 12, and the limiting ring and the cover plate 11 can be welded together. The cover plate 11 can also have through holes, through which the terminal post 12 may or may not pass. The terminal post 12 and the cover plate 11 can be fixed by methods such as press riveting, flange riveting, or spin riveting, or connected by methods such as injection molding or bonding. The battery cell 20 is the core energy storage component of the battery 100, assembled from a positive electrode, a negative electrode, and a separator by winding or stacking. Active materials are coated on the positive and negative electrodes, and electrochemical reactions occur during charging and discharging. The lithium-ion battery cell 20 mainly relies on the insertion and extraction movement of lithium ions between the positive and negative electrodes to operate. The battery cell 20 is immersed in an electrolyte and sealed within the casing 50.

[0060] A battery cell is the component in a battery where electrochemical reactions occur; it is the smallest unit in a battery capable of carrying out electrochemical reactions such as charging and discharging.

[0061] A battery cell is the basic unit in a battery, typically consisting of a positive electrode, a negative electrode, and a separator. Battery cells can be either wound or stacked. The main body of a battery cell includes the positive electrode, the negative electrode, and the separator located between the positive and negative electrodes.

[0062] A separator is placed between the positive and negative electrode plates to separate them and prevent short circuits caused by contact. The separator can be at least one of glass fiber, non-woven fabric, polyethylene (PE), polypropylene (PP), and polyvinylidene fluoride.

[0063] Lithium-ion cells primarily function by the insertion and extraction of lithium ions between the positive and negative electrode plates. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0064] The positive electrode is one of the core components in a battery that carries the positive electrode active material. During charging, metal ions (e.g., lithium ions) are released from the positive electrode active material (oxidation reaction), migrate through the electrolyte, and intercalate into the negative electrode. During discharging, metal ions (e.g., lithium ions in a lithium battery) are released from the negative electrode and intercalated into the positive electrode active material (reduction reaction), thus realizing the storage and release of lithium ions.

[0065] A positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is coated on at least one surface of the positive current collector and includes: a positive active material, a conductive agent, and a binder. The positive active material includes, but is not limited to, at least one of the following: lithium phosphates, lithium transition metal oxides and their respective modified compounds, or other conventional materials that can be used as positive active materials for batteries. These positive active materials can be used alone or in combination. The lithium phosphates include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also abbreviated as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Lithium transition metal oxides include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides, and their modified compounds.

[0066] The positive electrode current collector includes a conductive metal foil, which can be made of stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium with a silver-plated surface. Composite current collectors can also be used, which may include a polymer base layer and a metal layer. Composite current collectors are formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer substrate (such as polyethylene terephthalate, polyethylene terephthalate, polyethylene, polyethylene, etc.).

[0067] The positive electrode conductive agent includes, but is not limited to, one or more combinations of graphite, superconducting carbon, carbon black (such as acetylene black, Ketjen black, Super P, etc.), carbon nanotubes, graphene and carbon nanofibers.

[0068] The positive electrode binder includes, but is not limited to, one or more of the following: polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate resin, styrene-butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, carboxymethyl chitosan, etc.

[0069] During battery charging, active ions (such as Li) from the positive electrode are embedded in the negative electrode, while electrons from the positive electrode are transferred to the negative electrode through the external circuit to maintain charge balance. During discharge, active ions (such as Li) previously embedded in the negative electrode can be released, while electrons from the negative electrode are transferred to the negative electrode through the external circuit to maintain charge balance, thus achieving energy storage and release.

[0070] The negative electrode sheet includes a negative current collector and a negative active layer disposed on at least one surface of the negative current collector. The negative current collector is a conductive metal foil, which can be made of stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium with a silver-plated surface. The negative current collector can also be a composite current collector, which may include a polymer base material and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer base material (such as a base material of polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene, etc.). The negative active layer includes a negative active material, conductive components, and adhesives.

[0071] The negative electrode active material can be carbon-based materials such as graphite, porous carbon, hard carbon, soft carbon, and mesophase carbon microspheres, or silicon-based materials such as elemental silicon, silicon oxides, silicon-carbon composites, and silicon-ammonia composites. The conductive agent can be conductive carbon black, carbon nanotubes, etc., and the binder can be styrene-butadiene rubber, polyacrylic acid, etc.

[0072] In one possible implementation, the battery 100 further includes a housing 50. The housing 50 forms a receiving space 51. The battery cell 20 is disposed within the receiving space 51. A cover plate 11 covers the receiving space 51.

[0073] A housing is a component used to provide a space to house electrode assemblies and other parts and isolate them from the outside environment. A housing generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing can be closed by a cover plate to seal and isolate the internal environment of the battery cell from the external environment.

[0074] The casing material includes at least one of the following: copper, iron, aluminum, stainless steel, and aluminum alloy.

[0075] In one possible implementation, the cover plate 11 serves only as the surface on the housing 50 of the battery 100 where the terminal post 12 is located. It can be the end face that blocks the opening of the housing 50, or any non-opening end face of the housing 50.

[0076] The cover plate 11 has a first end face 111 and a second end face 112 facing each other. The pole post 12 is disposed on the first end face 111. The second end face 112 faces the receiving space 51.

[0077] The battery cell 20 includes a body 21 and a tab 22. The tab 22 is connected to the body 21. The tab 22 is electrically connected to the terminal post 12 via an adapter 30.

[0078] The main body 21 is the part of the battery cell 20 used for energy storage. The tab 22 is the part used to conduct electrical energy from the main body 21. The tab 22 can be directly processed from the positive and negative electrode plates in the battery cell 20 by cutting or other processing. The tab 22 can also be a conductive component that is electrically connected to the positive and negative electrode plates by welding or other means.

[0079] The tab is located on one side of the positive / negative current collector cell and is separately or integrally formed with the current collector. It is electrically connected to the current collector to conduct the current on the corresponding current collector. When the tab and the current collector are separately set, the tab and the current collector can be connected by welding.

[0080] The tabs are made of a metal material with good electrical conductivity (such as copper, aluminum, copper or nickel); including at least one of copper, iron, aluminum, aluminum alloys, etc.

[0081] The adapter 30 is a conductive metal sheet located between the end face of the body 21 and the terminal 12, typically made of aluminum foil or nickel sheet. The main function of the adapter 30 is to collect the current from the positive and negative tabs 22 and conduct it evenly and with low resistance to the corresponding terminal 12. The adapter 30 is usually connected to the tabs 22 and the terminal 12 by soldering.

[0082] Adapters are used to connect the battery output terminals (tabs) and the battery output terminals (terminal assembly) to electrically connect the battery cell to the battery output terminals. Adapters are made of at least one of the following materials: copper, iron, aluminum, and aluminum alloy.

[0083] In one possible implementation, the pole post 12 passes through the cover plate 11, but this is not the only possible implementation. In other possible implementations, the pole post 12 is directly disposed on the first end face 111 without passing through the cover plate 11, and the overall structure is set by passing through the cover plate 11 via the adapter 30.

[0084] like Figure 4 As shown, the electrode tab 22 is connected to the adapter 30 via the first solder mark 31. The electrode post 12 is connected to the adapter 30 via the second solder mark 32.

[0085] The first weld mark 31 refers to the weld mark formed by welding the adapter 30 to the electrode lug 22. The second weld mark 32 refers to the weld mark formed by welding the adapter 30 to the electrode post 12.

[0086] The welding methods for the first weld mark 31 and the second weld mark 32 can be ultrasonic, laser, resistance, or other methods that can weld the adapter 30 to the corresponding material. For example, the first weld mark 31 can be ultrasonically welded to the tab 22 and the adapter 30, in which case the first weld mark 31 is an ultrasonic weld mark. Alternatively, multiple tabs 223 can be pre-welded together using ultrasonic welding to form a tab 22, and then laser welding can be used to weld the tab 22 to the adapter 30 for fixation, in which case the first weld mark 31 is a laser weld mark.

[0087] In one possible implementation, the second solder mark 32 is located in the middle of the adapter 30 along the width direction of the cover plate 11. Two first solder marks 31 are located outside the second solder mark 32.

[0088] Along the length of the cover plate 11, the distance between the side of the first solder mark 31 near the adjacent end of the cover plate 11 and the side of the electrode tab 22 away from the end of the cover plate 11 is Kmm.

[0089] In the width direction of the cover plate 11, the projection of the first solder mark 31 and the projection of the second solder mark 32 at least partially overlap. The size of the overlapping area is K1mm, where K-K1=x, which is the distance between the end of the solder mark and the end of the tab 22 minus the size of the overlapping area, representing the size of the non-overlapping area of ​​the tab 22 measured from the starting end of the solder mark. Studies have found that this area is significantly affected by heat generation from adjacent tabs of opposite polarity, hindering electron transport. Compared to the overlapping area and the area between the other end of the tab 22 and the solder mark, this area has the most concentrated heat generation, acting as a bottleneck and shortcoming for current transport.

[0090] An insulating element 40 is provided between the adapter 30 and the second end face 112.

[0091] The insulating component 40 is a non-conductive plate located between the adapter 30 and the cover plate 11, serving to insulate and isolate the adapter 30 and the cover plate 11. Through the reliable creepage distance and electrical clearance provided by the insulating component 40, microscopic defects such as burrs, sharp corners, and weld spatters may exist on the adapter 30 and the cover plate 11. Air insulation alone could easily cause electric field concentration at these points. The insulating component 40 completely covers the side of the adapter 30 facing the cover plate 11, isolating it from the cover plate 11.

[0092] An insulating component is disposed between the terminal and the lower surface of the battery casing to insulate the terminal (electrode terminal) from the lower surface (or bottom surface) of the battery casing and to insulate the cell from the cover plate, thereby reducing the risk of short circuit.

[0093] The insulating component can be made of plastic, rubber, or other insulating materials. The plastic can include at least one of polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), and polyvinyl chloride (PVC). The rubber can include at least one of fluororubber, nitrile rubber, or isobutyl rubber.

[0094] The insulating component can be fixed to the cover plate by an adapter or by heat fusion.

[0095] In one possible implementation, the insulating element 40 is fixed to the cover plate 11.

[0096] The tab 22 includes a positive tab 221 and a negative tab 222. Along the thickness direction of the cover plate 11, the positive tab 221 and the negative tab 222 are located on the same side of the body 21 and are spaced apart. Along the length direction of the cover plate 11, the distance between the positive tab 221 and the negative tab 222 is D mm.

[0097] x and D satisfy: 0.032≤x / D≤4.565.

[0098] When the value of x increases, the value of D needs to be increased, that is, the distance between the positive tab 221 and the negative tab 222 needs to be increased to ensure that the distance between the positive tab 221 and the negative tab 222 of the battery 100 is appropriate and to avoid heat concentration. Furthermore, it is necessary to avoid the first solder mark 31 and the second solder mark 32 being too close, which could cause the insulating component 40 to melt during the welding process, and the adapter 30 to overlap with the cover plate 11, resulting in a short circuit.

[0099] If x / D is too large, the positive and negative tabs 222 are too close together and the non-overlapping part of the tabs 22 and the solder mark is too large, resulting in a long current transmission path, concentrated heat generation, and high resistance. If x / D is too small, the first solder mark 31 and the second solder mark 32 are too close together, the insulating part 40 melts during the welding process, the battery cell 20 overlaps with the cover plate 11, and there is a large short circuit problem.

[0100] By ensuring that the projections of the first solder mark 31 and the second solder mark 32 in the width direction at least partially overlap, forming an overlapping area, the transmission path of current flowing from the tab 22 through the adapter 30 to the terminal post 12 is shortened. This reduces the path resistance caused by current detours and improves the current transmission path, thereby directly and effectively reducing the overall internal resistance of the battery 100. This significantly reduces Joule heat generated by internal resistance during high-current fast charging of the battery 100, thus alleviating the problem of temperature rise during fast charging and improving fast charging efficiency and user experience. Simultaneously, by precisely controlling the spacing distance D between the positive tab 221 and the negative tab 222 and establishing a correlation with the aforementioned overlapping dimension and the parameters of the first solder mark 31 and the second solder mark 32, x / D is kept within a certain range. This avoids excessive local heat concentration caused by the close proximity of the positive and negative tabs 222, effectively dispersing the heat-generating area, preventing thermal runaway, and improving the safety and reliability of the battery 100 during fast charging.

[0101] In one possible implementation, K satisfies: 18mm≤K≤40mm.

[0102] By limiting the range of K values, welding strength and structural reliability are ensured. K ≥ 18 mm guarantees the minimum distance on the tab 22, ensuring sufficient area between the first weld mark 31 and the edge of the tab 22. This prevents tearing or incomplete welding of the tab 22 under stress during charge and discharge cycles due to the welding area being too close to the edge of the tab 22, thus improving the structural strength and long-term reliability of the first weld mark 31 connecting the tab 22 and the adapter 30. K ≤ 40 mm controls the maximum distance between the first weld mark 31 and the edge of the tab 22, preventing the first weld mark 31 from shifting excessively towards the edge of the cell body 21. This effectively controls the path length of current flowing from the tab body 22 into the first weld mark 31, helping to reduce path resistance, prevent increased heat generation, and improve the current transmission rate inside the battery 100, thereby improving the charge and discharge rate and fast charging capability of the battery 100.

[0103] In one possible implementation, K1 satisfies: 10mm≤K1≤70mm.

[0104] Parameter K1 directly determines the width of the shortest effective conductive path for current to flow from the first solder mark 31 to the second solder mark 32. By setting a lower limit, sufficient overlap area is ensured between the first solder mark 31 and the second solder mark 32, providing a minimum and low-resistance effective conductive path for current within the adapter 30, guaranteeing efficient current transmission. By setting an upper limit, excessive overlap area is prevented. A larger overlap area in the welding region may lead to heat accumulation of the solder marks during welding, thereby increasing thermal damage to the insulating component 40 and causing internal short circuits.

[0105] In one possible implementation, x satisfies: 3mm≤x≤69mm.

[0106] By limiting the range of x values, the separation of heat sources and the reasonable distribution of mechanical stress are ensured. Since x = K - K1, which is a difference, x can simultaneously limit the values ​​of K and K1. x ≥ 3 mm ensures that there is sufficient area between the edge of the first solder mark 31 and the tab 22, while preventing excessive overlap between the first solder mark 31 and the second solder mark 32. x ≤ 69 mm effectively controls the current path length, ensuring efficient current transmission, helping to reduce path resistance, prevent increased heat generation, and improve the current transmission rate of the battery 100, thereby improving the charge / discharge rate and fast charging capability of the battery 100.

[0107] like Figure 4 and Figure 5 As shown, in one possible implementation, along the length of the cover plate 11, the minimum distance between the first solder mark 31 and the adjacent end of the cover plate 11 is less than the minimum distance between the second solder mark 32 and the end of the cover plate 11. That is, the end of the first solder mark 31 is closer to the end of the cover plate 11.

[0108] By bringing the first solder mark 31 closer to the end of the cover plate 11, the length of the first solder mark 31 can be increased, thereby increasing the transmission channel from the cell 20 to the tab 22, avoiding the risk of poor soldering of the multi-layer tab 22, and at the same time increasing the welding interval between the positive and negative tabs 22 to avoid heat concentration at the solder mark.

[0109] At the same time, it can also maintain a sufficient distance D between the positive tab 221 and the negative tab 222 to avoid the positive tab 221 and the negative tab 222 getting too close, thus preventing the two tabs 22 from generating heat concentration due to being too close during fast charging, which would lead to increased resistance and improve the fast charging safety of the battery 100.

[0110] In one possible implementation, the difference between the distance between the first solder mark 31 and the adjacent end of the cover plate 11 and the distance between the second solder mark 32 and the end of the cover plate 11 along the length direction of the cover plate 11 is in the range of 1mm-20mm.

[0111] By limiting this difference within a certain range, the internal resistance of the current transmission path is ensured to be reasonable, and heat generation is reduced. If the difference is too large, it means that the distance between the positive tab 221 and the negative tab 222 is increased, resulting in a longer current transmission path and increased path resistance. Conversely, if the difference is too small, it means that the first solder mark 31 and the second solder mark 32 are aligned in the length direction, resulting in a high overlap of the two welding heat-affected zones, forming a local high-heat area, and causing heat loss from the insulating component 40. At the same time, it will also make the positive tab 221 and the negative tab 222 too close, causing the heat generation areas of the two to overlap during charging and discharging, exacerbating heat concentration and leading to thermal runaway.

[0112] like Figure 6 As shown, in one possible implementation, along the length of the cover plate 11, the minimum distance between the first solder mark 31 and the adjacent end of the cover plate 11 is greater than the minimum distance between the second solder mark 32 and the end of the cover plate 11. That is, the end of the second solder mark 32 is closer to the end of the cover plate 11.

[0113] Along the length of the cover plate 11, since the size of the electrode tab 22 is relatively larger than that of the electrode post 12, the size of the first solder mark 31 is relatively larger than that of the second solder mark 32. If the first solder mark 31 is too close to the edge, it will overlap excessively with the second solder mark 32 in the projection, causing the heat sources of the two weldings to overlap, which can easily melt the insulating part 40 and cause the adapter 30 to short-circuit with the cover plate 11.

[0114] In one possible implementation, the difference between the minimum distance between the first weld 31 and the adjacent end of the cover plate 11 and the minimum distance between the second weld 32 and the end of the cover plate 11 along the length direction of the cover plate 11 is in the range of 1mm-6mm.

[0115] By limiting this difference within a certain range, the internal resistance of the current transmission path is ensured to be reasonable, and heat generation is reduced. If the difference is too small, it means that the first weld mark 31 and the second weld mark 32 are aligned in the length direction, resulting in a high overlap of the two weld heat-affected zones, forming a local high-heat area, and causing heat loss from the insulating component 40. Conversely, if the difference is too large, it means that the positive electrode tab 221 and the negative electrode tab 222 are too close, causing their heat-generating areas to overlap during charging and discharging, exacerbating heat concentration, increasing resistance, and causing thermal runaway.

[0116] In one possible implementation, along the length of the cover plate 11, the distance between the first solder mark 31 and the adjacent end of the cover plate 11 is equal to the distance between the second solder mark 32 and the end of the cover plate 11. That is, the end of the second solder mark 32 is flush with the end of the first solder mark 31.

[0117] In one possible implementation, along the length of the cover plate 11, the distance between the side of the first solder mark 31 near the end of the adjacent cover plate 11 and the side of the tab 22 near the end of the cover plate 11 is K2mm, where K2 satisfies: 2mm≤K2≤30mm.

[0118] If the K2 value is too small, it means that the first solder mark 31 is too close to the edge of the tab 22. A solder mark that is too close to the edge will weaken the mechanical strength of the tab 22 at that point, making it prone to failure under long-term stress. Furthermore, it will cause the welding heat to concentrate excessively at the edge of the tab 22, hindering heat dissipation. Simultaneously, excessive overlap with the second solder mark 32 in the projection will cause the heat sources from both soldering processes to overlap, easily melting the insulating component 40 and leading to a short circuit between the adapter 30 and the cover plate 11. If the K2 value is too large, it means that the first solder mark 31 is excessively offset towards the cell body 21, lengthening the conductive path of the current between the tab 22 and the first solder mark 31, resulting in increased resistance and increased heat generation.

[0119] In one possible implementation, the size of the first solder mark 31 is K3 along the length of the cover plate 11.

[0120] In one possible implementation, K3 satisfies: 10mm≤K3≤20mm.

[0121] If the value of K3 is too small, it means that the first solder mark 31 is very small in length. At the same time, due to the limited width, the overcurrent area between the adapter 30 and the tab 22 is small, and the resistance when current flows into the first solder mark 31 increases, resulting in excessive temperature rise during high-rate charging, thus affecting the battery's high-rate charge and discharge performance. If the value of K3 is too large, it means that the welding area is too large, requiring too much heat and too long during welding, which can easily damage the insulating component 40, causing insulation failure between the adapter 30 and the cover plate 11, leading to a short circuit.

[0122] K1 and K3 satisfy: 1mm≤K3-K1≤19mm.

[0123] If the difference between K3 and K1 is too small, it means that the first solder mark 31 is almost completely covered by the projection of the second solder mark 32 in the length direction. After the current flows in from the tab 22, the effective conductive cross section transmitted to the pole 12 is mainly limited to the narrow overlapping area. The current lines are forced to concentrate, resulting in an increase in local current density, which in turn increases the local resistance and heat accumulation at the connection. If the difference between K3 and K1 is too large, it indicates that the first solder mark 31 is significantly longer than its overlapping part with the second solder mark 32 in the length direction, with a large independent welding area. The total heat input energy required increases, and the heat-affected zone also expands accordingly. The welding heat from the second solder mark 32 is superimposed, which can easily affect the insulating component 40, causing insulation failure and resulting in an internal short circuit.

[0124] In one possible implementation, the projection of the tab 22 at least partially overlaps with the projection of the adapter 30 in the thickness direction of the cover plate 11, and the size of the overlapping area is ≥0.2 of the length dimension of the adapter 30 along the length direction of the cover plate 11.

[0125] The overlapping area directly defines the effective contact and transmission area between the tab 22 and the adapter 30 for current to pass through. If the overlap ratio is too small, it means that the alignment area between the two is insufficient. When the current flows from the tab 22 to the adapter 30, it will be forced into a narrow channel at the first solder mark 31, causing the contact resistance of the interface to increase sharply. At the same time, the current density will increase abnormally in the local area, directly causing a significant increase in the heat generation power at that location, affecting the charge and discharge rate and fast charging capability of the battery 100.

[0126] In one possible implementation, the distance between the first weld mark 31 and the second weld mark 32 along the width direction of the cover plate 11 is M mm, where M satisfies: 1mm≤M≤25mm.

[0127] The parameter M ensures a balance between thermal safety and electrical performance. By setting a lower limit, direct superposition of welding heat sources is prevented, effectively separating the heat-affected zones of the two weld points. This reduces the risk of damage to the underlying insulating component 40 due to heat accumulation, which could lead to an internal short circuit caused by the overlap between the adapter 30 and the cover plate 11. Conversely, if M is too small, the distance between the first weld mark 31 and the second weld mark 32 becomes too close, causing heat concentration during welding and melting of the insulating component 40, resulting in insulation failure between the adapter 30 and the cover plate 11.

[0128] By setting an upper limit, the current transmission path from the tab 22 through the adapter 30 to the terminal 12 is limited, ensuring that the current distance between the first solder mark 31 and the second solder mark 32 is within a certain range. This reduces the current path, thereby lowering the internal resistance and improving the transmission rate of the internal and external current of the battery 100, thus improving the charge / discharge rate and fast charging capability of the battery 100. Conversely, if M is too large, the distance between the first solder mark 31 and the second solder mark 32 becomes too great, resulting in an excessively long overcurrent path, increased resistance, and excessive temperature rise during high-rate charging, thus affecting the high-rate charge / discharge performance of the battery 100.

[0129] In one possible implementation, M and K1 satisfy: 0.1≤M / K1≤25.

[0130] If the M / K1 ratio is too large, it means that the first solder mark 31 and the second solder mark 32 are excessively separated in the width direction and / or the width of the effective conductive channel in the length direction is insufficient, requiring the current to take an excessively long current path; and the channel carrying capacity from the first solder mark 31 to the second solder mark 32 is insufficient. The combination of these two factors will force the current to find a more circuitous path, significantly increasing the overall transmission resistance and generating more unnecessary Joule heat within the adapter 30, resulting in severe overall heat generation. If the M / K1 ratio is too small, it means that the first solder mark 31 and the second solder mark 32 are too close in the width direction and / or the overlapping area in the length direction is too long, causing the heat-affected zones of the two solder marks to highly overlap, forming a concentrated high-heat area, which is very easy to conduct and melt the insulating component 40, causing a short circuit problem.

[0131] In one possible implementation, D satisfies: 15mm≤D≤100mm.

[0132] If the D value is too small, it means that the positive tab 221 and the negative tab 222 are too close in space. During high-current fast charging, both tabs 22 become major heat sources. The close proximity will cause their thermal fields to overlap significantly, creating dangerous areas with highly concentrated local heat, greatly increasing the risk of thermal runaway. If the D value is too large, it increases the space occupied inside the battery 100, reducing energy density. Secondly, an excessively large D value means that the current transmission path is lengthened inside the battery 100, increasing the internal resistance of the battery 100 and leading to severe overall heat generation.

[0133] In one possible implementation, the size of the positive electrode tab 221 along the length of the cell 20 ranges from 14mm to 87.5mm.

[0134] In one possible implementation, the negative electrode tab 222 has a size ranging from 14mm to 87.5mm along the length of the cell 20.

[0135] In one possible implementation, the dimensions of the body 21 along the length of the cell 20 range from 140mm to 350mm.

[0136] In one possible implementation, the ratio of the sum of the dimensions of the positive tab 221 and the negative tab 222 to the dimension of the body 21 along the length of the cell 20 is in the range of 0.2-0.5.

[0137] If the size of a single tab 22 is too small or its total proportion is too small, it means that the current-carrying cross-sectional area for current to flow into / out of the cell 20 is insufficient. During high-current fast charging, the current is forced to squeeze through the narrow tab 22, causing the current density of the tab 22 body 21 to increase sharply, its internal resistance to increase significantly, and severe concentrated Joule heating to be generated, thus triggering thermal runaway. If the size of a single tab 22 or its total proportion is too large, in the limited length direction of the battery 100 cover plate 11, the excessively large positive tab 221 and negative tab 222 will cause the distance D between them to decrease. During high-current fast charging, both tabs 22 become the main heat sources. The close distance will cause the thermal fields of the two to overlap severely, creating a dangerous area with highly concentrated local heat, which greatly increases the risk of thermal runaway.

[0138] like Figure 10 As shown, in one possible implementation, the tab 22 includes at least two layers of tab sheets 223. Along the length of the cell 20, the at least two layers of tab sheets 223 are misaligned. The misalignment dimension is L, where L ≤ 20 mm.

[0139] If the misalignment L is too large, it means that the tabs 223 of each layer are severely misaligned in the length direction. This will cause the current flowing from the cell body 20 body 21 into the multi-layer tabs 22 to preferentially flow to the tab 223 with the largest projected overlap area or the shortest path. This will result in uneven current carrying by each layer of tabs 223, with some layers potentially overloaded while others are not fully utilized. This increases the AC internal resistance of the tabs 22 and causes localized overheating in the overloaded layers. At the same time, for the positive or negative tabs 22, excessive misalignment will increase the overall outline size of the tab 22 in the length direction. This will cause the distance D between the positive tab 221 and the negative tab 222 to be reduced in a limited space. During high-current fast charging, both tabs 22 will become the main heat sources. The close distance will cause the thermal fields of the two to overlap severely, creating dangerous areas with highly concentrated local heat, which greatly increases the risk of thermal runaway.

[0140] In one possible implementation, L satisfies: 2mm≤L≤20mm.

[0141] In one possible implementation, L and D satisfy: 0.02 ≤ L / D ≤ ​​1.3.

[0142] If the L / D ratio is too large, it means that the misalignment L inside the tab 22 is relatively large, and / or the distance D between the positive and negative tabs 222 is relatively small, which causes the thermal fields of the two tabs 22 to be severely superimposed, creating a dangerous area with highly concentrated local heat, which greatly increases the problem of thermal runaway.

[0143] If the L / D ratio is too small, it means that the layers of tabs 223 are too aligned and / or the spacing between the positive and negative tabs 222 is too large. Over-alignment of the tabs 223 layers affects assembly efficiency and heat dissipation of the tabs 22, while excessive spacing between the positive and negative tabs 222 lengthens the current transmission path inside the battery 100, increasing the internal resistance of the battery 100 and leading to severe overall heat generation.

[0144] In one possible implementation, both the positive tab 221 and the negative tab 222 are misaligned, and the sum of the misalignment size on the positive tab 221 and the misalignment size on the negative tab 222 ranges from 4mm to 20mm.

[0145] If the sum of the misalignment of the positive and negative tabs 222 is too large, it means that the multilayer tabs 223 on both sides of the positive tab 221 and the negative tab 222 have significantly expanded outward in the length direction, causing the lead-out ends of the tabs 22 on both sides to approach each other. During high-current fast charging, both tabs 22 become the main heat sources. The excessively close distance will cause the thermal fields of the two to overlap severely, creating a dangerous area with highly concentrated local heat, which greatly increases the problem of thermal runaway.

[0146] If the sum of the misalignment amounts is too small, approaching zero, it means that the positive tab 221 and the negative tab 222 are close to a fully aligned stacked structure. Although this can reduce the total width of the tab 22, the small sum of the misalignment amounts will complicate the process. At the same time, the fully aligned multilayer tabs 223 are in close contact, and the interlayer air gaps or heat dissipation channels are insufficient, which is not conducive to the conduction and dissipation of heat, resulting in the accumulation of heat inside the tab 22.

[0147] In one possible implementation, the size of the insulating element 40 in the thickness direction of the cover plate 11 ranges from 1.5 mm to 5 mm.

[0148] If the thickness of the insulating component 40 is insufficient, there is a risk of breakdown in the high-voltage battery 100 system. Furthermore, an excessively thin insulating component 40 is prone to plastic deformation or even cracking under long-term cycling or external pressure, losing its insulating function and causing a short circuit between the adapter 30 and the cover plate 11. If the thickness of the insulating component 40 is too large, while safety is improved, it occupies internal space in the battery 100, reducing energy density. Additionally, excessively thick insulating material increases material costs.

[0149] In one possible implementation, the melting temperature range of the insulating element 40 is 100°C to 200°C.

[0150] The melting temperature of the insulating component 40 must be significantly higher than the instantaneous high temperature generated by the welding process and the sustainable operating temperature of the battery 100 under fast charging. This ensures that the insulating component 40 will never melt or soften during normal manufacturing and use, thus eliminating short circuit problems caused by insulation failure. However, excessively high melting temperatures would increase the difficulty of material selection and also increase the cost of materials and manufacturing processes.

[0151] The method for testing the melting temperature is as follows: the battery is discharged to the lower limit voltage at 0.33C, the battery is disassembled, the insulating component 40 is taken out, 100mg of the insulating component 40 sample is taken, the insulating component 40 sample is placed in a standard aluminum crucible and sealed with a cap, and the temperature at which the insulating component 40 begins to melt is measured by DSC and recorded as the melting temperature. The heating rate is 10℃ / min.

[0152] like Figure 8 As shown, in one possible implementation, the electrode 22 is located between the adapter 30 and the second end face 112, that is, the electrode 22 is placed on top.

[0153] In the top-mounted tab 22 layout, the tab 22 is located on the adapter 30, which makes the connection at the top of the battery 100 more compact. This reduces the thickness of the tab 22 on the top of the cell 20, shortens the space occupied by the tab 22, saves space in the height direction, improves the space utilization inside the cell 20, and allows the cell 20 to be set larger, thereby increasing the energy density of the battery 100.

[0154] Meanwhile, when the cell 20 expands during cycling, the resulting expansion force pushes the tab 22 upwards. The adapter 30 directly bears and transmits this expansion force, thereby reducing the structural deformation of the tab 22 and improving the mechanical integrity of the battery 100 under long-term cycling.

[0155] In one possible implementation, the first solder mark 31 includes a first sub-solder mark 311 and a second sub-solder mark 312, with the first sub-solder mark 311 and the second sub-solder mark 312 located on both sides of the second solder mark 32 along the width direction of the cover plate 11.

[0156] Since the first solder mark 31 is used to weld the tab 22, dividing the first solder mark 31 into a first sub-solder mark 311 and a second sub-solder mark 312 allows the thicker tab 22 to be divided into two relatively thinner tabs 22 for separate welding. Welding the thicker tab 22 requires more heat. By dividing it into two sub-solder marks, the heat required for each sub-solder mark is reduced. Simultaneously, the welding heat is distributed across two spatially separated sub-solder marks. Compared to concentrating the heat in a single, high-heat first solder mark 31, this avoids excessively high peak temperatures and excessively large heat-affected zones in localized areas, reducing thermal damage to the insulating component 40.

[0157] A single first solder mark 31 would cause the current flowing out of the tab 22 to concentrate and surge into the adapter 30 from one side, resulting in uneven current distribution on the adapter 30. By using two spatially separated sub-solder marks, the current is forced to flow out of the tab 22 and simultaneously injected into the adapter 30 through the two sub-solder marks, so that the current enters the adapter 30 from both sides in the width direction, making the current distribution more uniform. This reduces the lateral current density of the adapter 30 body 21 and effectively avoids local ohmic overheating caused by current congestion on one side of the path, thereby improving the overall current carrying capacity and the temperature rise uniformity during long-term operation.

[0158] At the same time, after welding is completed, the two sub-weld marks form a physical constraint on the tab 22 from both sides, limiting the minor displacement or swing that the tab 22 may undergo in subsequent use.

[0159] like Figure 7 As shown, in one possible implementation, the adapter 30 is provided with a notch 33. Along the width direction of the cover plate 11, the notch 33 is located between the first sub-weld mark 311 and the second sub-weld mark 312. The size range of the notch 33 in the width direction of the cover plate 11 is 1mm-15mm.

[0160] The purpose of setting the notch 33 is to form overcurrent protection in the battery 100, which melts the adapter 30 when the current is too large, preventing thermal runaway due to excessive current.

[0161] The size of the notch 33 ensures a balance between thermal safety and electrical performance. Its range directly limits the boundaries of the battery 100's functional effectiveness and safety. Setting an upper limit prevents the notch 33 from becoming excessively wide. An overly large notch 33 would affect current flow, forcing the current to detour, increasing path resistance, and impacting the battery 100's charge / discharge rate and fast-charging capability. Simultaneously, an overly large notch 33 would weaken the overall rigidity and bending resistance of the adapter 30 in the width direction, making it more prone to deformation under stress and affecting the mechanical stability of the connection. Setting a lower limit ensures that the notch 33 is not too narrow. An overly narrow notch 33 would result in excessive current flow on the adapter 30, leading to severe heat generation and failing to guarantee melting and thermal runaway protection in case of excessive current.

[0162] In one possible implementation, the notch 33 may be provided on one side or both sides of the adapter 30 along the length of the cover plate 11.

[0163] like Figure 9 As shown, in one possible implementation, the adapter 30 is provided with at least two sub-notches 331. Along the width direction of the cover plate 11, the sub-notches 331 are located between the first sub-solder mark 311 and the second sub-solder mark 312. At least two sub-notches 331 are spaced apart in the width direction of the cover plate 11.

[0164] The design of multiple sub-notches 331 can achieve the purpose of setting notches 33, namely, to provide overcurrent protection and to improve the overall strength of the adapter 30 and prevent deformation of the adapter 30. Multiple sub-notches 331 can significantly improve the bending stiffness and overall stability of the adapter 30 in the width direction, and its effect is far superior to a single large notch 33 of the same total width.

[0165] In one possible implementation, the spacing between the sub-notches 331 along the width direction of the cover plate 11 ranges from 5 mm to 20 mm.

[0166] The spacing between the sub-notches 331 affects the strength of the adapter 30 and the distance between the first solder mark 31 and the second solder mark 32. By setting a lower limit, the adapter 30 is ensured to have sufficient mechanical strength. Too small a spacing means that the adapter 30 has lower strength, is prone to deformation, and is prone to breakage under vibration or stress. Since the sub-notches 331 are all located between the first solder mark 31 and the second solder mark 32, by setting an upper limit, the distance between the first solder mark 31 and the second solder mark 32 is indirectly limited, preventing the problem of increased resistance and increased heat generation caused by an increased current distance between the first solder mark 31 and the second solder mark 32. At the same time, by reducing the current path and lowering the internal resistance, the transmission rate of the internal and external current of the battery 100 is improved, thereby improving the charge and discharge rate and fast charging capability of the battery 100.

[0167] In one possible implementation, the size of the sub-notch 331 in the width direction of the cover plate 11 ranges from 1 mm to 5 mm.

[0168] By setting an upper limit, the sub-notch 331 is prevented from becoming excessively wide. An excessively large sub-notch 331 would affect current overcurrent, forcing the current to detour, increasing path resistance, and impacting the charge / discharge rate and fast charging capability of the battery 100. Simultaneously, an excessively large sub-notch 331 would weaken the overall rigidity and bending resistance of the adapter 30 in the width direction, making it more prone to deformation under stress and affecting the mechanical stability of the connection. By setting a lower limit, the sub-notch 331 is ensured not to be too narrow. An excessively narrow sub-notch 331 would result in a large overcurrent, failing to guarantee fuse tripping under excessive current and thus failing to achieve thermal runaway protection.

[0169] In one possible implementation, the projection of the notch 33 at least partially coincides with the projection of the first solder mark 31 in the width direction of the cover plate 11. There is a gap between the projection of the notch 33 and the projection of the second solder mark 32.

[0170] After heat is generated from the first solder mark 31, it is directly blocked by the gap 33 in the area overlapping with the first solder mark 31 when it is conducted to the sides and the middle area in the width direction. This achieves direct and effective isolation of the heat source and prevents the heat generated by the first solder mark 31 from spreading laterally to the second solder mark 32 and affecting the insulating component 40, causing the insulating component 40 to melt and causing the adapter 30 to overlap with the shell 50, resulting in an internal short circuit.

[0171] The notch 33 and the projection of the second solder mark 32 are spaced apart, so that the notch 33 is far away from the second solder mark 32. This ensures the integrity of the main current interface from the adapter 30 to the terminal post 12. The second solder mark 32 is a key interface for current to flow out to the external circuit. The notch 33 keeps a distance from it, ensuring that the current flow path in this area is the shortest. This avoids the increase in internal resistance caused by the longer path of current entering the second solder mark 32 after bypassing the notch 33. This improves the transmission rate of the internal and external current of the battery 100, thereby improving the charge and discharge rate and fast charging capability of the battery 100.

[0172] In one possible implementation, the distance between the projection of the notch 33 and the projection of the second solder mark 32 along the length of the cover plate 11 ranges from 0.1 mm to 8 mm.

[0173] If the interval is too small, it means that the notch 33 and the second solder mark 32 are too close in space along the length direction, which weakens the heat insulation function of the notch 33. When heat is generated from the first solder mark 31 and conducted through the adapter 30, it can bypass the notch 33 and be conducted to the area of ​​the second solder mark 32, resulting in a reduction in the heat insulation effect, an increase in heat generation, and the melting of the insulating part 40. This can cause the adapter 30 to overlap with the cover, resulting in an internal short circuit.

[0174] If the spacing is too large, although sufficient thermal isolation is ensured, the current flowing from the first solder mark 31 area to the second solder mark 32 must detour, lengthening the current transmission path between the first solder mark 31 and the second solder mark 32, resulting in increased resistance. This leads to severe overall heat generation during battery 100 operation, especially during high-current charging and discharging.

[0175] In one possible implementation, the tab 22 includes at least two layers of tab plates 223. The tab plates 223 extend along the length of the cell 20. Along the extension direction of the tab 22, the dimensions of the at least two layers of tab plates 223 are different.

[0176] Since the tab 22 is led out from the cell 20 through multiple layers of tab pieces 223, if all the tab pieces 223 are of equal length and too large, due to the top position of the tab 22, after the tab 22 is bent out, some of the tab pieces 223 will extend beyond the overall position of the tab 22, resulting in too much coverage of the adapter piece. This will cause the end or edge of the tab piece 223 to enter or get very close to the welding area of ​​the second solder mark 32, thus interfering with the welding of the second solder mark 32.

[0177] like Figure 11 As shown, in one possible implementation, the difference between the maximum and minimum dimensions of the tab 223 along the lead-out direction of the tab 22 is H. The range of H is 1mm-10mm.

[0178] If the difference between the maximum and minimum dimensions is too small, the effective contact area available for welding with the adapter 30 will be limited at the end of the tab 22 due to insufficient dimensional shrinkage. This will reduce the actual welding area of ​​the first solder mark 31, increase the contact resistance at the connection, and generate severe local Joule heating when operating at high current.

[0179] If the difference is too large, after the tab 22 is bent out, the largest tab 223 will exceed the overall position of the tab 22, resulting in too much coverage of the adapter piece. This will cause the end or edge of the tab 223 to enter or get very close to the welding area of ​​the second solder mark 32, thus interfering with the welding of the second solder mark 32.

[0180] In one possible implementation, the lead-out size of the tab 223 gradually increases along the stacking direction of at least two layers of tabs 223.

[0181] When the smaller tab 223 is located on the inner side of the stack and the larger tab is located on the outer side, the tab 22 naturally forms a relatively flat cross-section in the bending area. This provides a flat welding base for the first weld mark 31 to be welded to the adapter 30, which is conducive to forming a weld point with sufficient area and strong bonding.

[0182] In one possible implementation, x and D satisfy: 0.08 ≤ x / D ≤ 1.893.

[0183] In one possible implementation, this application provides a method for preparing a lithium-ion battery, the preparation process of which is as follows:

[0184] (1) Preparation of the positive electrode:

[0185] The prepared positive electrode active material, conductive agent (acetylene black), and binder (PVDF) are mixed, and solvent NMP is added. The mixture is stirred under vacuum until the system is homogeneous to obtain a positive electrode slurry. The positive electrode slurry is uniformly coated on both surfaces of the positive electrode current collector aluminum foil, dried at room temperature, and then transferred to an oven for further drying. After cold pressing and slitting, the positive electrode sheet is obtained.

[0186] Specifically, the mass ratio of positive electrode active material: conductive agent: binder satisfies (92~98): (4~1): (4~1).

[0187] (2) Preparation of negative electrode:

[0188] The negative electrode active material, conductive agent (acetylene black), thickener (carboxymethyl cellulose (CMC)), and binder (styrene-butadiene rubber (SBR)) are mixed, and deionized water is added as a solvent. The mixture is stirred under vacuum until the system is homogeneous to obtain a negative electrode slurry. The negative electrode slurry is uniformly coated on both surfaces of the negative electrode current collector copper foil, dried at room temperature, and then transferred to an oven for further drying. After cold pressing and slitting, the negative electrode sheet is obtained.

[0189] Specifically, the ratio of negative electrode active material: conductive agent: thickener: binder satisfies (90~96): (4~2): (2~1): (4~1).

[0190] (3) Preparation of electrolyte:

[0191] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed in a volume ratio of 1:1:1 to obtain an organic solvent. Then, fully dried lithium salt LiPF6 was dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0192] (4) Preparation of the diaphragm:

[0193] Polyethylene film is selected as the diaphragm.

[0194] (5) Preparation of lithium-ion batteries:

[0195] The aforementioned positive electrode, separator, and negative electrode are sequentially wound or stacked to form a bare cell with tabs. The bare cell is then electrically connected to a cover plate with terminals via an adapter. The adapter is welded to the terminals to form a second weld mark, and the adapter is welded to the tabs to form a first weld mark. Before welding the terminals to the adapter, an insulating component is placed between the adapter and the cover plate. After welding, the bare cell is placed in the battery casing, which is a square casing. The battery is then dried, injected with electrolyte, and then packaged, left to stand, formed, and capacitated to obtain a lithium-ion battery.

[0196] The positive electrode active material can be selected from one or more lithium-containing positive electrode active materials, including lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0197] The negative electrode active material can be selected from one or more of the following negative electrode active main materials: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0198] The electrode temperature test is specifically conducted as follows: Following the above preparation method, five batteries were prepared for each embodiment and comparative example. The batteries of each embodiment and comparative example were connected to a temperature sensor at 25°C, and charged at a constant current rate of 4C until the battery voltage reached its upper limit. Then, constant voltage charging was switched until the battery current dropped to 0.05C. The temperature change of the electrode terminals was recorded throughout the charging process. The temperature of the five battery terminals in each embodiment and comparative example was measured, and the highest value was recorded. If the highest electrode temperature was less than or equal to 45°C, the test result was considered good; if the highest electrode temperature was greater than 45°C but less than 65°C, it was considered qualified; and if the highest electrode temperature was greater than or equal to 65°C, it was considered unqualified.

[0199] When the positive electrode active material of the battery is a nickel-cobalt-manganese ternary cathode, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V. When the positive electrode active material of the battery is lithium iron phosphate, the upper limit voltage is 3.6V and the lower limit voltage is 2.5V.

[0200] In this test, the active material for the positive electrode of the battery was selected from LiNi. 0.6 Co 0.2 Mn 0.2 Taking O2 as an example, all other positive electrode materials meet the above test requirements. The mass ratio of positive electrode active material: conductive agent: binder meets 96:2:2. The negative electrode active material is selected from artificial graphite. The ratio of negative electrode active material: conductive agent: thickener: binder meets 95:2:1:2. The bare cell is selected as a wound cell. Other bare cell forms meet the above test requirements.

[0201] The insulation thickness reduction rate test is as follows: According to the above preparation method, 5 batteries are prepared for each embodiment and comparative example. The minimum thickness of the insulation corresponding to the area enclosed by the first and second solder marks is recorded as h1. The batteries of each embodiment and comparative example are charged at a constant current rate of 1C at 25°C until the battery voltage reaches the upper limit voltage. Then, the charging is switched to constant voltage until the battery current drops to 0.05C. After standing for 5 minutes, the battery is discharged at a 1C rate until the lower limit voltage is reached. After standing for 5 minutes, the battery is discharged again. After 500 cycles, the battery is disassembled and the minimum thickness of the insulation corresponding to the area enclosed by the first and second solder marks is measured as h2. According to the formula, the thinning rate = ((h1-h2) / h1)×100%, if the thinning rate ≤2%, it is good; if the thinning rate is greater than 2% and ≤10%, it is qualified; and if it is greater than 10%, it is unqualified.

[0202] When the positive electrode active material of the battery is a nickel-cobalt-manganese ternary cathode, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V. When the positive electrode active material of the battery is lithium iron phosphate, the upper limit voltage is 3.6V and the lower limit voltage is 2.5V.

[0203] In this test, the active material for the positive electrode of the battery was selected from LiNi. 0.6 Co 0.2 Mn 0.2 Taking O2 as an example, all other positive electrode materials meet the above test requirements. The mass ratio of positive electrode active material: conductive agent: binder meets 96:2:2. The negative electrode active material is selected from artificial graphite. The ratio of negative electrode active material: conductive agent: thickener: binder meets 95:2:1:2. The bare cell is selected as a wound cell. Other bare cell forms meet the above test requirements.

[0204] It should be noted that the following table compares multiple sets of embodiments and comparative data.

[0205] Table 1 presents the data from pole temperature testing and insulation thickness reduction rate testing for multiple sets of embodiments and comparative examples.

[0206]

[0207] The battery 100 provided in this application embodiment includes a cover plate assembly 10 and a battery cell 20. The cover plate assembly 10 includes a cover plate 11 and a terminal post 12. The cover plate 11 has a first end face 111 and a second end face 112 facing each other. The terminal post 12 is fixedly connected to the cover plate 11. The battery cell 20 includes a body 21 and a tab 22 connected to the body 21. The tab 22 and the terminal post 12 are electrically connected via an adapter 30. The tab 22 is connected to the adapter 30 via a first solder mark 31. The terminal post 12 is connected to the adapter 30 via a second solder mark 32. Along the length direction of the cover plate 11, the distance between the side of the first solder mark 31 near the adjacent end of the cover plate 11 and the side of the tab 22 away from the end of the cover plate 11 is K mm. In the width direction of the cover plate 11, the projection of the first solder mark 31 and the projection of the second solder mark 32 at least partially overlap. The size of the overlapping area is K1 mm. K - K1 = x. An insulating element 40 is provided between the adapter 30 and the second end face 112. The electrode tab 22 includes a positive electrode tab 221 and a negative electrode tab 222 spaced apart along the length of the cover plate 11. The distance between the positive electrode tab 221 and the negative electrode tab 222 is D mm. x and D satisfy: 0.032≤x / D≤4.565.

[0208] By ensuring that the projections of the first solder mark 31 and the second solder mark 32 in the width direction at least partially overlap, forming an overlapping area, the transmission path of current flowing from the tab 22 through the adapter 30 to the terminal post 12 is significantly shortened. This reduces the path resistance caused by current detours, improves the current transmission path, and thus directly and effectively reduces the overall internal resistance of the battery 100. This significantly reduces Joule heating caused by internal resistance during high-current fast charging, thereby alleviating the heat generation problem during fast charging. Simultaneously, by precisely controlling the spacing distance D between the positive tab 221 and the negative tab 222, and establishing a correlation with the aforementioned overlapping dimension and the parameters of the first solder mark 31 and the second solder mark 32, x / D is kept within a certain range. This avoids excessive local heat concentration caused by the close proximity of the positive and negative tabs 222, effectively dispersing the heat-generating area, preventing the risk of thermal runaway, and improving the safety and reliability of the battery 100 during fast charging. This also enhances the user experience and comfort.

[0209] like Figure 12 As shown, this application embodiment also provides a battery device 200, including a conductive bus 201 and the aforementioned battery 100. The conductive bus 201 is used to electrically connect two corresponding batteries 100 or to realize the external output of the battery 100.

[0210] Battery devices can serve as operating power sources or driving power sources for electrical devices, replacing or partially replacing fuel or natural gas to provide driving power for vehicles. Electrical devices encompass a wide range of technological fields, including energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0211] The busbar 201 electrically connects the terminals 12 (battery current output terminals) of at least two batteries 100 to realize the series or parallel connection of multiple battery cells.

[0212] The busbar 201 is a conductive metal strip used to draw current from the battery 100 for use by electrical equipment; it is typically made of aluminum or copper. The busbar 201 is primarily used to draw current from the terminal 12.

[0213] The conductive busbar 201 is made of materials such as metals or alloys such as copper, aluminum, tungsten, and manganese, or copper-aluminum composite materials, which have good electrical conductivity.

[0214] The busbar 201 is usually welded to the pole post 12. Welding methods include resistance welding and laser welding.

[0215] Since the battery device 200 in this embodiment includes the battery 100 described in any of the above embodiments, the battery device 200 includes the battery 100 structure and beneficial effects, which will not be described in detail here.

[0216] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0217] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0218] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0219] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0220] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized by, include: A cover plate assembly, the cover plate assembly including a cover plate and an electrode post, the cover plate having a first end face and a second end face opposite to each other, and the electrode post being fixedly connected to the cover plate; A battery cell, comprising a body and tabs connected to the body, wherein the tabs are electrically connected to the terminals via an adapter, the tabs are connected to the adapter via a first solder mark, and the terminals are connected to the adapter via a second solder mark; Along the length of the cover plate, the distance between the side of the first solder mark near the adjacent end of the cover plate and the side of the electrode lug away from the end of the cover plate is K mm. In the width direction of the cover plate, the projection of the first solder mark and the projection of the second solder mark at least partially overlap, and the size of the overlapping area is K1mm, K-K1=x; An insulating component is provided between the adapter and the second end face. The electrode tabs include positive electrode tabs and negative electrode tabs spaced apart along the length of the cover plate, and the distance between the positive electrode tabs and the negative electrode tabs is D mm; x and D satisfy: 0.032≤x / D≤4.

565.

2. The battery of claim 1, wherein, Along the length of the cover plate, the minimum distance between the first solder mark and the adjacent end of the cover plate is less than the minimum distance between the second solder mark and the end of the cover plate.

3. The battery according to claim 2, characterized in that, Along the length of the cover plate, the difference between the distance between the first solder mark and the adjacent end of the cover plate and the distance between the second solder mark and the end of the cover plate ranges from 1 mm to 20 mm.

4. The battery according to claim 1, characterized in that, Along the length of the cover plate, the minimum distance between the first solder mark and the adjacent end of the cover plate is greater than the minimum distance between the second solder mark and the end of the cover plate.

5. The battery according to claim 4, characterized in that, Along the length of the cover plate, the difference between the minimum distance between the first solder mark and the adjacent end of the cover plate and the minimum distance between the second solder mark and the end of the cover plate ranges from 1mm to 6mm.

6. The battery according to claim 1, characterized in that, Along the length of the cover plate, the distance between the side of the first solder mark near the end of the cover plate and the side of the electrode near the end of the cover plate is K2mm, where K2 satisfies: 2mm≤K2≤30mm.

7. The battery according to claim 1, characterized in that, Along the length of the cover plate, the size of the first solder mark is K3, and K3 satisfies: 1mm≤K3-K1≤19mm.

8. The battery according to claim 1, characterized in that, In the thickness direction of the cover plate, the projection of the electrode lug at least partially overlaps with the projection of the adapter, and along the length direction of the cover plate, the size of the overlapping area is ≥0.2 of the length of the adapter.

9. The battery according to claim 1, characterized in that, Along the width direction of the cover plate, the distance between the first solder mark and the second solder mark is M mm, where M satisfies: 1mm≤M≤25mm.

10. The battery according to claim 9, characterized in that, M and K1 satisfy: 0.1≤M / K1≤25.

11. The battery according to claim 1, characterized in that, D satisfies: 15mm≤D≤100mm.

12. The battery according to claim 1, characterized in that, K satisfies: 18mm ≤ K ≤ 40mm; and / or, K1 satisfies: 10mm ≤ K1 ≤ 70mm; and / or, x satisfies: 3mm≤x≤69mm.

13. The battery according to claim 1, characterized in that, Along the length of the battery cell, the size of the positive electrode tab ranges from 14mm to 87.5mm; and / or, The negative electrode tab has a size range of 14mm-87.5mm; and / or, The ratio of the sum of the dimensions of the positive electrode and the negative electrode to the dimension of the main body is in the range of 0.2-0.

5.

14. The battery according to claim 1, characterized in that, The electrode includes at least two layers of electrode plates. Along the length of the battery cell, at least two layers of electrode plates are misaligned, and the misalignment dimension is L, where L satisfies: L≤20mm.

15. The battery according to claim 14, characterized in that, L and D satisfy: 0.02≤L / D≤1.

3.

16. The battery according to claim 14, characterized in that, Both the positive electrode tab and the negative electrode tab are misaligned, and the sum of the misalignment size on the positive electrode tab and the misalignment size on the negative electrode tab ranges from 4mm to 20mm.

17. The battery according to any one of claims 1-16, characterized in that, In the thickness direction of the cover plate, the size of the insulating element ranges from 1.5mm to 5mm; and / or, The melting temperature range of the insulating component is 100℃~200℃.

18. The battery according to any one of claims 1-16, characterized in that, The electrode tab is located between the adapter and the second end face.

19. The battery according to any one of claims 1-16, characterized in that, The first weld mark includes a first sub-weld mark and a second sub-weld mark, and along the width direction of the cover plate, the first sub-weld mark and the second sub-weld mark are respectively located on both sides of the second weld mark.

20. The battery according to claim 19, characterized in that, The adapter has a notch located between the first sub-weld mark and the second sub-weld mark along the width direction of the cover plate. The size of the notch ranges from 1mm to 15mm along the width direction of the cover plate.

21. The battery according to claim 19, characterized in that, The adapter is provided with at least two sub-notches. Along the width direction of the cover plate, the sub-notches are located between the first sub-weld mark and the second sub-weld mark. In the width direction of the cover plate, at least two sub-notches are spaced apart.

22. The battery according to claim 21, characterized in that, Along the width direction of the cover plate, the spacing between the sub-notches ranges from 5mm to 20mm.

23. The battery according to claim 21, characterized in that, In the width direction of the cover plate, the size of the sub-notch ranges from 1mm to 5mm.

24. The battery according to claim 20, characterized in that, In the width direction of the cover plate, the projection of the notch at least partially coincides with the projection of the first solder mark, and there is a gap between the projection of the notch and the projection of the second solder mark.

25. The battery according to claim 24, characterized in that, Along the length of the cover plate, the distance between the projection of the notch and the projection of the second solder mark ranges from 0.1mm to 8mm.

26. The battery according to any one of claims 1-16, characterized in that, The tab includes at least two layers of tab plates, which are led out along the length of the battery cell. Along the lead-out direction of the tab, the dimensions of the at least two layers of tab plates are different.

27. The battery according to claim 26, characterized in that, Along the lead-out direction of the electrode tab, the difference between the maximum and minimum dimensions of the electrode tab is H, and the range of H is 1mm-10mm.

28. The battery according to claim 26, characterized in that, Along the stacking direction of at least two layers of the tabs, the lead-out dimensions of the tabs gradually increase.

29. A battery device, characterized in that, It includes a busbar and a battery as described in any one of claims 1-28, wherein the busbar is electrically connected to at least two terminals of the battery.

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