Battery, battery pack, electric device, and energy storage device

Abstract

A battery (4), a battery pack (100), an electric device, and an energy storage device, relating to the technical field of batteries. The battery (4) comprises a housing (10), a top cover assembly (20), and an electrode assembly (30). The housing (10) defines an accommodating space and has an opening on one side. The top cover assembly (20) is arranged on the housing (10) and seals the opening. The top cover assembly (20) comprises a top cover body (21). A snap-fit step (211) is provided on the bottom surface of the top cover body (21) facing away from the top surface of the top cover body (21) in a first direction (X). The top cover body (21) matches the edge of the opening of the housing (10) by means of the snap-fit step (211) so as to seal the opening of the housing (10). The electrode assembly (30) is accommodated in the accommodating space. The top cover body (21) matches the edge of the opening of the housing (10) by means of the snap-fit step (211), so that if there is a gap between the side surfaces of the top cover body (21) and the side walls of the housing (10), gas escaping from the gap between the side surfaces of the top cover body (21) and the side walls of the housing (10) in the first direction (X) is blocked by the snap-fit step (211) to a certain extent, thereby facilitating reduction of gas escape, and better sealing the opening of the housing (10).

Description

Battery, battery pack, power-consuming device and energy storage device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present disclosure is based on Chinese patent application with application number 202410254401.3, application date March 6, 2024, and invention name “Battery and manufacturing method thereof, top cover assembly, battery pack, power-consuming and energy storage device” and Chinese patent application with application number 202410254427.8, application date March 6, 2024, and invention name “A battery, a battery pack, a power-consuming device and a battery module”, and claims the priority of the above Chinese patent applications. The entire contents of the above Chinese patent applications are hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a battery, a battery pack, an electrical device, and an energy storage device. Background Art

[0004] Batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0005] The batteries of the battery pack are installed in the box, and the batteries in the box are charged to store energy or discharged to supply power to the outside. In the related art, it is difficult for the top cover body to properly close the opening of the shell. Summary of the Invention

[0006] In view of this, the embodiments of the present disclosure are intended to provide a battery, a battery pack, an electrical device, and an energy storage device, so that the top cover body can better seal the opening of the shell.

[0007] To achieve the above objectives, the technical solution of the embodiment of the present disclosure is implemented as follows:

[0008] An embodiment of the present disclosure provides a battery, comprising:

[0009] a housing defining a receiving space and having an opening on one side;

[0010] a top cover assembly disposed on the housing and closing the opening, the top cover assembly comprising a top cover body, a bottom surface of the top cover body being provided with a locking step along a first direction away from the top surface of the top cover body, the top cover body cooperating with the opening edge of the housing through the locking step to close the opening of the housing;

[0011] The electrode assembly is accommodated in the accommodation space.

[0012] In the embodiment of the present disclosure, during the process of installing the top cover body to the shell, the opening edge of the shell is guided to move by the guide surface of the guide rib, so that the opening edge of the shell is close to the outer side wall of the installation groove, thereby guiding the opening of the shell to a predetermined position in the installation groove, and the opening edge of the shell can be better constrained by the guide rib and the outer side wall of the installation groove.

[0013] In some embodiments, the engaging step is recessed toward the top surface of the top cover body to form a mounting groove, and the opening edge of the shell is inserted into the mounting groove.

[0014] In the disclosed embodiment, the opening edge of the shell is inserted into the installation groove, and the opening edge of the shell is constrained by the groove wall of the installation groove, which is beneficial to reducing the shaking of the top cover body relative to the shell.

[0015] In some embodiments, the locking step has a guide rib located in the mounting groove, the guide rib is located on the inner side of the shell, and the guide rib has a guide surface on the side facing the side wall of the shell. The distance between the guide surface and the side wall of the shell is a preset distance, and the preset distance gradually increases along the direction from the bottom of the top cover body to the top of the top cover body.

[0016] In the embodiment of the present disclosure, during the process of installing the top cover body to the shell, the opening edge of the shell is guided to move by the guide surface of the guide rib, so that the opening edge of the shell is close to the outer side wall of the installation groove, thereby guiding the opening of the shell to a predetermined position in the installation groove, and the opening edge of the shell can be better constrained by the guide rib and the outer side wall of the installation groove.

[0017] In some embodiments, the top cover itself is glued to the shell.

[0018] In the embodiment of the present disclosure, the top cover body is glued to the shell, so that the top cover body can be installed on the shell more conveniently.

[0019] In some embodiments, the top cover assembly further includes a first and a second conductive connecting member disposed on the top cover body, the first connecting member including a first connecting portion and a first exposed portion connected to the first connecting portion, the second connecting member including a second connecting portion and a second exposed portion connected to the second connecting portion, the first connecting portion and the second connecting portion each including a connecting surface extending along a first direction, and the first exposed portion and the second exposed portion being exposed to the outside of the housing;

[0020] The electrode assembly includes a positive electrode tab and a negative electrode tab extending along the first direction, the connection surface of the first connection portion is connected to the positive electrode tab or the negative electrode tab surface, and the connection surface of the second connection portion is connected to the positive electrode tab or the negative electrode tab surface that is not connected to the first connection portion.

[0021] In the embodiment of the present disclosure, since the connecting surface of the first connecting part, the connecting surface of the second connecting part, the positive electrode tab and the negative electrode tab of the electrode assembly all extend along the first direction (for example, the up and down direction in the figure), the positive electrode tab and the negative electrode tab of the electrode assembly are connected to the connecting surface of the first connecting part and the connecting surface of the second connecting part respectively without bending, thereby reducing the risk of breakage of the positive electrode tab and the negative electrode tab, and reducing the possibility of gaps between the tabs (positive electrode tab, negative electrode tab) and the connecting surfaces of the connecting parts (first connecting part, second connecting part), reducing the risk of cold welding, making the connection more reliable, and improving battery stability.

[0022] In some embodiments, the first connecting member further includes a third connecting portion connected to the first connecting portion, and the third connecting portion includes a connecting surface extending along the first direction; the number of the second connecting members is an even number.

[0023] In the embodiment of the present disclosure, the first connecting portion and the third connecting portion of the first connecting member are connected, so that one first connecting member can be electrically connected to two tabs.

[0024] In some embodiments, the battery comprises at least two electrode assemblies,

[0025] The first connecting portion of the first connecting member is connected to the positive electrode tab or the negative electrode tab of one electrode assembly, and the third connecting portion of the first connecting member is connected to the positive electrode tab or the negative electrode tab of another electrode assembly.

[0026] The tabs in each of the electrode assemblies that are not connected to the first connector are respectively connected to the second connecting portion of the second connector.

[0027] In the embodiment of the present disclosure, the positive terminal and the negative terminal of the electrode assembly series can be respectively led out from the second exposed portions of the two second connectors.

[0028] In some embodiments, an insulating shielding member is provided between the second connecting portions of two adjacent second connecting members.

[0029] In the embodiment of the present disclosure, the insulating shielding member can block the positive electrode tab and the negative electrode tab connected to the connection surfaces of two adjacent second connection parts, thereby preventing short circuit and improving battery reliability.

[0030] In some embodiments, the insulating shielding member protrudes from both ends of the second connecting member along the first direction.

[0031] In the embodiment of the present disclosure, the insulating shielding member protrudes from both ends of the second connecting member along the first direction, so that the two second connecting members can be better separated at both ends of the first direction, which is beneficial to increase the electrical gap and creepage distance between the two second connecting members and improve the insulation performance.

[0032] In some embodiments, the battery also includes an insulating support connected to the insulating shielding member, and the insulating support is provided on both opposite sides of the insulating shielding member along the direction in which the two second connecting members are arranged. The insulating support is located on the side of the top cover body facing the electrode assembly along the first direction, and the end of the second connecting portion facing away from the second exposed portion is against the side of the insulating support facing the top cover body.

[0033] In the embodiment of the present disclosure, the insulating supports on both sides of the insulating shielding member respectively support the second connection parts of the two second connectors away from the end of the second exposed part, so that the second connection part of one of the two second connectors is away from the end of the second exposed part, and the distance along the surface of the insulating shielding member through the insulating support member to the second connection part of the other second connector is increased, thereby increasing the creepage distance between the corresponding second connection parts of the two second connectors and improving the insulation performance.

[0034] In some embodiments, among the second connection portions of two adjacent second connection members, a side of the second connection portion of each second connection member facing away from the corresponding other second connection portion protrudes from the insulating platform.

[0035] In the embodiment of the present disclosure, the second connection portion of each second connecting member protrudes from the insulating platform on one side facing away from the corresponding other second connection portion, so that the positive pole tab or the negative pole tab connected to the second connection portion hardly contacts the insulating platform, thereby reducing the possibility of interference between the insulating platform and the positive pole tab or the negative pole tab.

[0036] In some embodiments, the insulating shield comprises:

[0037] an insulating body connected to a side of the insulating support platform facing the top cover body, the insulating body being clamped between the second connecting portions of two adjacent second connecting members;

[0038] An insulating auxiliary part is connected to the side of the insulating base facing away from the top cover body, the thickness of the insulating auxiliary part along the arrangement direction of two adjacent second connecting parts is smaller than the thickness of the insulating main body along the arrangement direction of two adjacent second connecting parts, and the size of the insulating auxiliary part along the first direction is larger than the thickness of the insulating auxiliary part along the arrangement direction of two adjacent second connecting parts.

[0039] In the embodiment of the present disclosure, while minimizing the impact on the creepage distance between the second connection parts of two adjacent second connectors, the mass of the insulating auxiliary parts can be reduced as much as possible, which is beneficial to improving the mass energy density of the battery.

[0040] In some embodiments, the insulating shielding member also includes an insulating spacer, which is connected to the side of the insulating body away from the insulating base, and the insulating spacer protrudes from the side of the second exposed portion away from the second connecting portion along the first direction. The thickness of the insulating spacer along the arrangement direction of two adjacent second connecting members is less than the thickness of the insulating body along the arrangement direction of two adjacent second connecting members, and the size of the insulating spacer along the first direction is greater than the thickness of the insulating spacer along the arrangement direction of two adjacent second connecting members.

[0041] In the embodiment of the present disclosure, the mass of the insulating separator can be reduced as much as possible while minimizing the impact on the creepage distance between the second exposed portions of two adjacent second connectors, which is beneficial to improving the mass energy density of the battery.

[0042] In some embodiments, the connection surface of the first connection portion is welded to the positive electrode tab or the negative electrode tab surface, and the connection surface of the second connection portion is welded to the positive electrode tab or the negative electrode tab surface that is not connected to the first connection portion.

[0043] In the embodiment of the present disclosure, the connection between the connection surface of the first connection part and the positive electrode tab or the negative electrode tab is achieved by welding, and the connection between the connection surface of the second connection part and the positive electrode tab or the negative electrode tab not connected to the first connection part is achieved by welding.

[0044] In some embodiments, the shell has a pressure relief port, and the pressure relief port is communicated with the accommodating space.

[0045] In the embodiment of the present disclosure, the pressure relief port is connected to the accommodation space of the shell, and the thermal runaway gas in the accommodation space can be discharged through the pressure relief port, thereby achieving pressure relief in the accommodation space.

[0046] In some embodiments, the battery further includes a pressure relief cover connected to the shell, and the pressure relief cover is disposed on the pressure relief port.

[0047] In the embodiment of the present disclosure, by providing a pressure relief cover on the pressure relief port, the storage space connected to the pressure relief port can be blocked to a certain extent, thereby preventing objects in the storage space from falling out and reducing the possibility of external debris entering the storage space.

[0048] In some embodiments, the pressure relief cover is an insulating film having a melting point less than or equal to 500° C., or the pressure relief cover has a weakened area for pressure relief.

[0049] In the disclosed embodiment, the pressure relief cover is an insulating film, which helps reduce the possibility of short circuiting the electrode assembly within the housing. The melting point of the insulating film is less than or equal to 100°C. This relatively low melting point facilitates thermal runaway gases within the containment space to melt through the insulating film, thereby relieving the pressure in the containment space.

[0050] In some embodiments, the wall thickness of the weakened area is smaller than the wall thickness of the rest of the pressure relief cover.

[0051] In the embodiment of the present disclosure, by providing a weakened area on the pressure relief cover, the pressure relief cover can better cover the pressure relief port when no thermal runaway occurs, and can better relieve pressure when thermal runaway occurs.

[0052] In some embodiments, the battery further includes a sealing bag, which is sleeved on the outside of the electrode assembly, and the sealing bag is located inside the shell.

[0053] In the embodiment of the present disclosure, the electrolyte is sealed by a sealing bag, so that the electrode assembly is immersed in the electrolyte.

[0054] A second aspect of an embodiment of the present application provides a battery pack, including:

[0055] Box;

[0056] Any of the above batteries is located in the box.

[0057] A third aspect of an embodiment of the present application provides an electrical device comprising any one of the above-mentioned batteries or any one of the above-mentioned battery packs.

[0058] A fourth aspect of the embodiments of the present application provides an energy storage device, comprising:

[0059] Any of the above batteries or any of the above battery packs, wherein the battery can store electrical energy and provide electrical energy.

[0060] In the battery pack provided by the embodiment of the present disclosure, since the top cover body cooperates with the opening edge of the shell through the locking step, when there is a gap between the side of the top cover body and the side wall of the shell, the gas escaping from the gap between the side of the top cover body and the side wall of the shell along the first direction is blocked to a certain extent by the locking step, which is beneficial to reducing gas leakage and thus better sealing the opening of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] FIG1 is a schematic structural diagram of a vehicle provided by some embodiments of the present disclosure;

[0062] FIG2 is a schematic structural diagram of a battery pack provided by some embodiments of the present disclosure;

[0063] FIG3 is a schematic structural diagram of a battery with its housing removed provided by some embodiments of the present disclosure;

[0064] FIG4 is a schematic structural diagram of a battery with its housing removed from another perspective provided by some embodiments of the present disclosure;

[0065] FIG5 is a perspective exploded schematic diagram of a top cover assembly provided by some embodiments of the present disclosure;

[0066] FIG6 is a schematic structural diagram of a top cover assembly provided in other embodiments of the present disclosure;

[0067] FIG7 is a perspective exploded schematic diagram of a top cover assembly provided in some other embodiments of the present disclosure;

[0068] FIG8 is a perspective schematic diagram of a top cover assembly provided in still other embodiments of the present disclosure;

[0069] FIG9 is a schematic diagram of the top cover assembly in FIG8 from another perspective;

[0070] FIG10 is an exploded perspective view of the top cover assembly in FIG8 ;

[0071] FIG11 is a schematic diagram of the bottom surface structure of the top cover body provided in some embodiments of the present disclosure;

[0072] FIG12 is a schematic diagram of top cover assemblies connected into groups according to some embodiments of the present disclosure;

[0073] FIG13 is a flow chart of a battery manufacturing method according to some embodiments of the present disclosure;

[0074] FIG14 is a schematic structural diagram of a battery provided by some embodiments of the present disclosure, showing an inlet and an outlet of a temperature regulating container extending outside the accommodation space;

[0075] FIG15 is a schematic diagram of the structure of a battery provided by some embodiments of the present disclosure, showing conductive terminals;

[0076] FIG16 is an exploded view of a battery provided by some embodiments of the present disclosure;

[0077] FIG17 is an assembly diagram of a housing and an insulating layer provided in some embodiments of the present disclosure;

[0078] FIG18 is a schematic diagram of position AA in FIG17 ;

[0079] FIG19 is an enlarged view of position B in FIG18;

[0080] FIG20 is a diagram illustrating an arrangement of a temperature regulating container and a battery cell according to some embodiments of the present disclosure;

[0081] FIG21 is a schematic structural diagram of a temperature-regulating container provided in some embodiments of the present disclosure;

[0082] FIG22 is an assembly diagram of a top cover and a housing according to some embodiments of the present disclosure;

[0083] FIG23 is a layout diagram of at least two batteries arranged in sequence according to some embodiments of the present disclosure;

[0084] FIG24 is a schematic structural diagram of a battery provided by some embodiments of the present disclosure, showing the cross-sectional position of the battery;

[0085] FIG25 is a cross-sectional view at position CC in FIG24;

[0086] FIG. 26 is an enlarged view of position D in FIG. 25 .

[0087] Explanation of Reference Numerals Vehicle 1000; Battery Pack 100; Controller 200; Motor 300; Battery 4; Housing 10; Top Cover Assembly 20; Top Cover Body 21; Engaging Step 211; Engaging Protrusion 212; Recessed Portion 213; First Connecting Member 22; First Connecting Portion 221; First Exposed Portion 222; Third Connecting Portion 223; First Bend Portion 224; First Current Bottleneck 225; Second Connecting Member 23; Second Connecting Portion 231; Second Exposed Portion 232; Fourth Connecting Portion 241; Electric Pole assembly 30; positive electrode tab 31; negative electrode tab 32; first direction X; second direction Y; third direction Z; wrapping structure 1; accommodating space 11; pressure relief vent 12; bending plate 131; flange 141; insulating layer 15; conductive terminal 2; transfer electrode 902; sampling electrode 903; battery cell 3; flame-retardant cover 904; notch 41; through hole 42; temperature control container 5; temperature control chamber 51; inlet 52; outlet 53; container body 54; first guide plate 55; second guide plate 56; reinforcement plate 6. DETAILED DESCRIPTION

[0088] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," "third," "fourth," and "fifth" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0094] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0095] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0096] Hereinafter, the present disclosure will be described in detail.

[0097] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as aircraft. As the application of power batteries continues to expand, market demand is also growing.

[0098] During battery manufacturing, it is sometimes necessary to electrically connect multiple electrode assemblies into a group. In related art, a top cover body is mounted on a housing. The top cover body lacks a structure that abuts the housing along a first direction. When a gap exists between the side of the top cover body and the sidewall of the housing, gas within the housing can escape from between the top cover body and the sidewall of the housing approximately along the first direction, making it difficult for the top cover body to effectively seal the opening of the housing.

[0099] In this regard, the present disclosure provides a battery, in which the locking step of the top cover body cooperates with the opening edge of the shell, so that the opening edge of the shell abuts against the bottom surface of the top cover body away from the top surface of the top cover body along a first direction. When there is a gap between the side surface of the top cover body and the side wall of the shell, the gas escaping from the gap between the side surface of the top cover body and the side wall of the shell along the first direction is blocked to a certain extent by the locking step, which is conducive to reducing gas leakage and thus better sealing the opening of the shell.

[0100] Based on this design concept, the present disclosure provides a battery comprising a housing and a top cover assembly. The housing defines a storage space and has an opening on one side. The top cover assembly is disposed within the housing and closes the opening. The top cover assembly includes a top cover body, the bottom surface of the top cover body being provided with a locking step along a first direction facing away from the top surface of the top cover body. The top cover body engages with the edge of the housing opening via the locking step to close the housing opening. The electrode assembly is accommodated in the storage space.

[0101] Since the top cover body cooperates with the opening edge of the shell through the locking step, when there is a gap between the side surface of the top cover body and the side wall of the shell, the gas escaping from the gap between the side surface of the top cover body and the side wall of the shell along the first direction is blocked to a certain extent by the locking step, which is conducive to reducing gas escape and thus better sealing the opening of the shell.

[0102] The battery provided by the embodiments of the present disclosure can be used, but is not limited to, in electrical devices such as energy storage power systems, vehicles, ships, or aircraft. Because the tabs of the battery provided by the embodiments of the present disclosure can be connected without bending, the risk of tab breakage is reduced, thereby improving the reliability of the electrical device.

[0103] The batteries provided in the embodiments of the present disclosure can also be grouped together to form a battery pack. The battery pack can also be used in, but is not limited to, energy storage power supply systems, vehicles, ships, aircraft, and other electrical devices.

[0104] The embodiments of the present disclosure provide an electrical device including the above-mentioned battery or battery pack for providing electrical energy. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, an aircraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric aircraft toy, etc. The aircraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0105] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0106] Figure 1 is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present disclosure. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As shown in Figure 1, a battery pack 100 is provided inside the vehicle 1000. The battery pack 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery pack 100 may be used to power the vehicle 1000. For example, the battery pack 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery pack 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0107] In some embodiments of the present disclosure, the battery pack 100 can serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0108] FIG2 is a schematic structural diagram of a battery pack 100 provided in an embodiment of the present disclosure. As shown in FIG2 , the battery pack 100 includes at least one battery 4. The battery pack may further include a case (not shown), and at least one battery 4 is accommodated in the accommodation space formed by the case. There may be multiple batteries 4, and the multiple batteries 4 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple batteries 4 are both connected in series and in parallel. The multiple batteries 4 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple batteries 4 is placed in the accommodation space formed by the case; of course, the battery pack 100 may also be a battery module formed by first connecting multiple batteries 4 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the accommodation space formed by the case. The battery pack 100 may also include other structures. For example, the battery pack 100 may also include a busbar component for realizing electrical connection between the multiple batteries 4.

[0109] In the embodiment of the present disclosure, the battery may be a secondary battery. A secondary battery refers to a battery that can be recharged to activate active materials after being discharged and can be used continuously.

[0110] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present disclosure are not limited to this.

[0111] Batteries typically include an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the battery's charge and discharge processes, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. Separators, placed between the positive and negative electrodes, prevent short circuits while allowing the active ions to pass through.

[0112] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0113] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0114] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0115] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0116] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0117] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0118] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0119] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0120] In some embodiments, the separator is a separator. The present disclosure has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0121] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0122] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0123] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0124] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0125] In some embodiments, the electrode assembly is a laminate structure.

[0126] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0127] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0128] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0129] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0130] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0131] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0132] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0133] In some embodiments, the battery may include a housing. The housing is used to house components such as the electrode assembly and electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film.

[0134] As an example, the battery can be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include square-shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no special limitation in the present disclosure.

[0135] In some embodiments, the housing has an opening, and the end caps seal the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The housing may have one or more openings. One or more end caps may also be provided.

[0136] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter component. The electrode terminal may be provided on the end cap or on the housing.

[0137] In some embodiments, a pressure relief mechanism is provided on the end cap to release the internal pressure of the battery cell.

[0138] The present disclosure also provides a battery pack comprising one or more batteries to provide a single physical module with higher voltage and capacity. When there are multiple batteries, the multiple batteries are connected in series, in parallel, or in hybrid mode via a busbar.

[0139] In some embodiments, the battery pack includes a case and batteries, wherein the batteries are housed in the case.

[0140] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0141] First embodiment:

[0142] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIG. 2 to FIG. 12 .

[0143] The embodiment of the present disclosure provides a battery 4, please refer to Figures 2 to 4, Figure 11 and Figure 26. The battery 4 includes a shell 10, a top cover assembly 20 and an electrode assembly 30. The shell 10 defines a storage space and has an opening on one side. The top cover assembly 20 is arranged on the shell 10 and closes the opening. The top cover assembly 20 includes a top cover body 21. The bottom surface of the top cover body 21 is away from the top surface of the top cover body 21 along the first direction X and is provided with a locking step 211. The top cover body 21 cooperates with the opening edge of the shell 10 through the locking step 211 to close the opening of the shell 10. The electrode assembly 30 is accommodated in the storage space.

[0144] The housing 10 may be a rigid housing or a soft housing. The housing 10 may have various shapes, depending on the structure of the electrode assembly 30. For example, the housing 10 may be circular, square, polygonal, or other shapes.

[0145] The top cover assembly 20 is disposed on the housing 10 and closes the opening, so as to enclose the electrode assembly 30 in the accommodation space defined by the housing 10 .

[0146] The electrode assembly 30 includes stacked positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive lead connected to the end of the positive current collector, which serves as the positive electrode tab. The negative electrode sheet includes a negative current collector and a negative lead connected to the end of the negative current collector, which serves as the negative electrode tab. Alternatively, the positive lead is connected to a positive electrode adapter, so that the positive lead and the positive electrode adapter together form the positive electrode tab; the negative lead is connected to a negative electrode adapter, so that the negative lead and the negative electrode adapter together form the negative electrode tab.

[0147] 2 to 7 and 11 , the side of the top cover body 21 facing the electrode assembly 30 along the first direction X is the bottom, and the side of the top cover body 21 facing away from the electrode assembly 30 along the first direction X is the top.

[0148] In the embodiment of the present disclosure, since the top cover body 21 cooperates with the opening edge of the shell 10 through the locking step 211, when there is a gap between the side of the top cover body 21 and the side wall of the shell 10, the gas escaping from the gap between the side of the top cover body 21 and the side wall of the shell 10 along the first direction X is blocked to a certain extent by the locking step 211, which is beneficial to reduce gas escape and thus better seal the opening of the shell 10.

[0149] On the other hand, the top cover body 21 cooperates with the opening edge of the shell 10 through the locking step 211, and the opening edge of the shell 10 can abut against the bottom surface of the top cover body 21 away from the top surface of the top cover body 21 along the first direction X, so that the top cover body 21 can be better positioned relative to the shell 10 along the first direction X.

[0150] In some embodiments, referring to FIG. 11 and FIG. 24 to FIG. 26 , the engaging step 211 is recessed toward the top surface of the top cover body 21 to form a mounting groove, and the opening edge of the housing 10 is inserted into the mounting groove.

[0151] The mounting groove is a recessed structure that accommodates the opening edge of the housing 10 .

[0152] The opening edge of the housing 10 is inserted into the installation groove, and the opening edge of the housing 10 is located between the inner groove wall and the outer groove wall of the installation groove.

[0153] Exemplarily, the mounting slot is a groove.

[0154] In the disclosed embodiment, the opening edge of the shell 10 is inserted into the installation groove, and the opening edge of the shell 10 is constrained by the groove wall of the installation groove, which is beneficial to reducing the shaking of the top cover body 21 relative to the shell 10.

[0155] In some embodiments, the top cover body 21 is glued to the shell 10 .

[0156] For example, glue may be applied between the top cover body 21 and the housing 10 to achieve bonding.

[0157] For example, the top cover body 21 and the housing 10 may be bonded together by adhesive tape.

[0158] Exemplarily, the tape for bonding the top cover body 21 and the housing 10 may be a ceramic composite tape.

[0159] In the embodiment of the present disclosure, the top cover body 21 is glued to the shell 10 , so that the top cover body 21 can be installed on the shell 10 more conveniently.

[0160] In some embodiments, the top cover body 21 and the housing 10 may be connected via a connector, for example, via rivets.

[0161] In some embodiments, referring to Figures 11 and 26, the engaging step 211 has a guide rib 901 located in the mounting groove, the guide rib 901 is located on the inner side of the shell 10, and the guide rib 901 has a guide surface 9011 on the side facing the side wall of the shell. The distance between the guide surface 9011 and the side wall of the shell 10 is a preset distance, and the preset distance gradually increases along the direction from the bottom of the top cover body 21 to the top of the top cover body.

[0162] The guide rib 901 is a structure for guiding the opening edge of the housing 10 to move to a predetermined position in the installation groove.

[0163] Exemplarily, the guide rib 901 may be in the shape of a plate-like structure.

[0164] Exemplarily, the number of the guide ribs 901 may be at least two, and the at least two guide ribs 901 are arranged at intervals along the circumference of the top cover body 21 .

[0165] The preset distance gradually increases along a direction from the bottom of the top cover body 21 to the top of the top cover body 21 , and the guide surface 901 gradually approaches the side wall of the housing 10 and tilts from bottom to top along the first direction X.

[0166] Exemplarily, referring to FIG. 26 , the distance between the guide surface 9011 and the side wall of the housing 10 is a preset distance, which is shown as D3 in the figure.

[0167] In the embodiment of the present disclosure, during the process of installing the top cover body 21 to the shell 10, the opening edge of the shell 10 is guided to move by the guide surface 9011 of the guide rib 901, so that the opening edge of the shell 10 is close to the outer side wall of the installation groove, thereby guiding the opening of the shell 10 to a predetermined position in the installation groove, and the opening edge of the shell 10 can be better constrained by the guide rib 901 and the outer side wall of the installation groove.

[0168] In some embodiments, the engaging step 211 may not be provided with the guide rib 901 .

[0169] It should be noted that the tabs of the electrode assemblies of multiple batteries 4 are connected to each other into groups and then connected to the connectors (such as tabs) of the top cover assembly, and then connected to the connectors through the busbar components to further connect the batteries 4 into groups. The tabs of multiple electrode assemblies are usually welded to the connectors of the top cover assembly in a bent state (for example, bent 90 degrees). The stress concentration at the bent position of the tabs can easily lead to the risk of fracture, and gaps are likely to appear where the bent part overlaps the connector, resulting in cold welding, which may cause the tabs to be unreliably connected to the connector.

[0170] In view of this, in some embodiments, please refer to Figures 2 to 12, the top cover assembly 20 also includes a first connecting member 22 and a second connecting member 23 that are conductive and are arranged on the top cover body 21, the first connecting member 22 includes a first connecting portion 221 and a first exposed portion 222 connected to the first connecting portion 221, the second connecting member 23 includes a second connecting portion 231 and a second exposed portion 232 connected to the second connecting portion 231, the first connecting portion 221 and the second connecting portion 231 both include a connecting surface extending along the first direction X, the first exposed portion 222 and the second exposed portion 232 are exposed to the outside of the shell 10; the electrode assembly 30 is accommodated in the accommodating space, the electrode assembly 30 includes a positive electrode tab 31 and a negative electrode tab 32 extending along the first direction X, the connecting surface of the first connecting portion 221 is connected to the surface of the positive electrode tab 31 or the negative electrode tab 32, and the connecting surface of the second connecting portion 231 is connected to the surface of the positive electrode tab 31 or the negative electrode tab 32 that is not connected to the connecting surface of the first connecting portion 221.

[0171] The first connector 22 and the second connector 23 can be made of a conductive metal material, such as copper, aluminum, steel, or a copper-aluminum alloy. The first connector 221 and the second connector 231 of the first connector 22 and the second connector 23 are respectively used to connect one of the positive electrode tab 31 and the negative electrode tab 32 of the electrode assembly 30 to the other. The first exposed portion 222 of the first connector 22 and the second exposed portion 232 of the second connector 23 are exposed to the outside of the housing 10 and are used to connect to an external busbar component to achieve electrical connection between multiple batteries 4, such as series connection, parallel connection, or hybrid connection. The first connector 22 and the second connector 23 are sometimes referred to as tabs or adapter tabs.

[0172] The connection surface of the first connection portion 221 is connected to the surface of the positive electrode tab 31 or the negative electrode tab 32, and the connection surface of the second connection portion 231 is connected to the surface of the positive electrode tab 31 and the negative electrode tab 32 that are not connected to the connection surface of the first connection portion 221. Optionally, the connection surface of the first connection portion 221 can be connected to the positive electrode tab 31, and the connection surface of the second connection portion 231 can be connected to the negative electrode tab 32; or the connection surface of the first connection portion 221 can be connected to the negative electrode tab 32, and the connection surface of the second connection portion 231 can be connected to the positive electrode tab 31.

[0173] The so-called "surface connection" may, for example, be that the connection surface of the first connecting portion 221 and the surface of the positive electrode tab 31 have an overlapping portion in a third direction Z (e.g., the left-right direction in the figure) perpendicular to the first direction X, achieving a bend-free connection in this overlapping portion and reducing the gap. In some embodiments, the positive electrode tab 31 and the negative electrode tab 32 extend from the positive electrode sheet and the negative electrode sheet in the electrode assembly 30 respectively along the first direction X, and the extended portions are unbent. Such unbent positive electrode tab 31 and negative electrode tab 32 are respectively connected to the connection surface of the first connecting portion 221 and the connection surface of the second connecting portion 231 by welding.

[0174] Illustratively, the connection surface of the first connection portion 221 is welded to the connection surface of the positive electrode tab 31 or the connection surface of the negative electrode tab 32 , and the connection surface of the second connection portion 231 is welded to the connection surface of the positive electrode tab 31 or the connection surface of the negative electrode tab 32 not connected to the first connection portion 231 .

[0175] Since the connection surface of the first connection part 221, the connection surface of the second connection part 231, the positive electrode tab 31 and the negative electrode tab 32 of the electrode assembly 30 all extend along the first direction X (for example, the up and down direction in the figure), the positive electrode tab 31 and the negative electrode tab 32 of the electrode assembly 30 are connected to the connection surface of the first connection part 221 and the connection surface of the second connection part 231 respectively without bending, thereby reducing the risk of breakage of the positive electrode tab 31 and the negative electrode tab 32, and reducing the possibility of gaps between the connection surfaces of the tabs (positive electrode tab, negative electrode tab) and the connection parts (first connection part, second connection part), reducing the risk of cold welding, making the connection more reliable, and improving battery stability.

[0176] In some embodiments, as shown in FIG. 5 , in the first connecting member 22 , the first connecting portion 221 is connected to the first exposed portion 222 by bending; in the second connecting member 23 , the second connecting portion 231 is connected to the second exposed portion 232 by bending.

[0177] The first connection portion 221 and the first exposed portion 222 may be connected in a bent manner, with an angle formed between the first connection portion 221 and the first exposed portion 222. In one example, the first connection portion 221 and the first exposed portion 222 are perpendicular to each other. The first connection portion 221 and the first exposed portion 222 may be located on opposite sides of the top cover body 21 in the first direction X, for example, as shown in FIG5 , the first connection portion 221 is located below the top cover body 21, and the first exposed portion 222 is located above the top cover body 21. In addition, depending on the specific circumstances, the first connection portion 221 and the first exposed portion 222 may also not be bent.

[0178] The second connection portion 231 and the second exposed portion 232 may be connected by a bend, with an angle formed between the second connection portion 231 and the second exposed portion 232. In one example, the second connection portion 231 and the second exposed portion 232 are perpendicular to each other. The second connection portion 231 and the second exposed portion 232 may be located on opposite sides of the top cover body 21 in the first direction X, for example, as shown in FIG5 , the second connection portion 231 is located below the top cover body 21, and the second exposed portion 232 is located above the top cover body 21. In addition, depending on the specific circumstances, the second connection portion 231 and the second exposed portion 232 may also not be bent.

[0179] Here, the bent structure can be realized, for example, by bending processing, and can certainly be realized by other suitable methods.

[0180] By bending and connecting the first connecting portion 221 and the first exposed portion 222 , and bending and connecting the second connecting portion 231 and the second exposed portion 232 , the space occupied by the first connecting member 22 and the second connecting member 23 on the battery is reduced, providing more space for battery grouping.

[0181] In some embodiments, the first exposed portion 222 and the second exposed portion 232 are both parallel to the top surface of the top cover body 21 .

[0182] The first exposed portion 222 and the second exposed portion 232 may extend in parallel along a third direction Z perpendicular to the first direction X.

[0183] The first exposed portion 222 and the second exposed portion 232 may extend parallel to each other along the third direction Z, including the case where the first exposed portion 222 and / or the second exposed portion 232 are substantially flush with the top surface of the top cover body 21 , and also including the case where a table surface difference is formed relative to the top cover body 21 .

[0184] As shown in FIG. 5 , in some embodiments, a recessed portion 213 may be formed on the top surface of the top cover body 21 , so that the first exposed portion 222 and the second exposed portion 232 are partially or completely submerged in the recessed portion 213 .

[0185] Since both the first exposed portion 222 and the second exposed portion 232 are parallel to the top surface of the top cover body 21, it is convenient to connect multiple batteries via the busbar assembly to achieve series, parallel, or mixed connection. This also helps to reduce the space occupied by the first exposed portion 222 and the second exposed portion 232 and the busbar assembly above the top cover body 21 (on the side facing away from the housing 10 along the first direction X).

[0186] In some embodiments, as shown in Figure 6, the first connecting member 22 and the second connecting member 23 are arranged side by side on the top cover body 21 along the second direction Y, and / or, as shown in Figure 5, the first connecting member 22 and the second connecting member 23 are arranged side by side on the top cover body 21 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0187] In some embodiments, the first connector 22 and the second connector 23 are arranged in pairs. Since each electrode assembly 30 includes two tabs (a positive tab 31 and a negative tab 32), each tab is correspondingly connected to a connector. In some embodiments, the number of electrode assemblies 30 is one, and the first connector 22 and the second connector 23 are respectively connected to the positive tab 31 and the negative tab 32 of the electrode assembly 30. In some embodiments, the number of electrode assemblies 30 is multiple, and each tab of each electrode assembly 30 is connected to a connector (the first connector 22 or the second connector 23). The paired first connector 22 and the second connector 23 can be arranged side by side on the top cover body 21 along the second direction Y; or arranged side by side on the top cover body 21 along the third direction Z. The arrangement direction and setting position of the first connector 22 and the second connector 23 can be set according to the arrangement position of the positive tab 31 and the negative tab 32 of the electrode assembly 30.

[0188] By arranging the first connector 22 and the second connector 23 side by side, it is possible to more conveniently connect to the positive electrode tab 31 and the negative electrode tab 32, thereby improving the battery manufacturing efficiency; the first connector 22 and the second connector 23 can be arranged side by side in pairs in any direction of the second direction Y or the third direction Z, and can be adapted to electrode assemblies of different specifications / types, making the connection more flexible.

[0189] 6 , a pair of first connectors 22 and second connectors 23 are exemplarily shown disposed side by side on the top cover body 21 along the second direction Y. Referring to FIG. 5 , a pair of first connectors 22 and second connectors 23 are exemplarily shown disposed side by side on the top cover body 21 along the third direction Z.

[0190] In some embodiments, as shown in FIG. 7 , the first connecting member 22 further includes a third connecting portion 223 connected to the first connecting portion 221 , and the third connecting portion 223 includes a connecting surface extending along the first direction X; the number of the second connecting members 23 is an even number.

[0191] In the embodiment shown in FIG7 , the connector having the first connecting portion 221 and the third connecting portion 223 is referred to as the first connector 22, and the connector including only the connecting portion and the exposed portion is referred to as the second connector 23. That is, in the example shown in FIG7 , one first connector 22 and two second connectors 23 are shown. Of course, two or more first connectors 22 and four, six, or even more pairs of second connectors 23 may also be provided. Because the first connecting portion 221 of the first connector 22 is connected to the third connecting portion 223, a single connector 22 can electrically connect two tabs.

[0192] In some embodiments, the battery 4 includes at least two electrode assemblies, the first connecting portion 221 of the first connecting member 22 is connected to the positive electrode tab 31 or the negative electrode tab 32 of one electrode assembly 30, the third connecting portion 223 of the first connecting member 22 is connected to the positive electrode tab 31 or the negative electrode tab 32 of another electrode assembly 20, and the tabs in each electrode assembly 20 that are not connected to the first connecting member 22 are respectively connected to the second connecting portion of the second connecting member 23.

[0193] The first connector 22 can connect two tabs, and the second connector 23 can each connect one tab. For example, there are two second connectors 23. The first connector 221 of the first connector 22 and the second connector 231 of the second connector 23 are respectively connected to the positive tab 31 and the negative tab 32 of the same electrode assembly 20. The third connector 223 and the second connector 231 of another second connector 23 are respectively connected to the negative tab 32 and the positive tab 31 of another electrode assembly 30, thereby forming a series of electrode assemblies 30 (hereinafter sometimes referred to as an "electrode assembly series"). In this case, the positive terminal and the negative terminal of the electrode assembly series can be respectively led out from the second exposed portion 232 of each of the two second connectors 23.

[0194] For another example, the number of second connectors 23 is two, the first connector 221 of the first connector 22 and the second connector 231 of the second connector 23 are respectively connected to the positive electrode tab 31 and the negative electrode tab 32 of the same electrode assembly 20, and the third connector 223 and the second connector 231 of another second connector 23 are respectively connected to the positive electrode tab 31 and the negative electrode tab 32 of another electrode assembly 30, thereby forming a parallel electrode assembly 30 (hereinafter sometimes also referred to as an "electrode assembly parallel body"). In this case, the positive terminal and the negative terminal of the electrode assembly parallel body can be respectively led out from the second exposed portion 222 of the first connector 22 and the second exposed portion 232 of any second connector 23. It should be noted that the two second connectors 23 connected to the same-pole tabs can be electrically connected through a busbar component or the like.

[0195] Thus, a plurality of electrode assemblies without bent tabs can be connected in series or in parallel through a top cover 20, thereby improving connection reliability, increasing series and parallel connection efficiency, and helping to reduce the number of components in the battery.

[0196] As an example, a first connector 22 and two second connectors 23 can constitute a connection group, and each connection group can connect two electrode assemblies in series or in parallel. Figure 7 exemplarily shows that a connection group is set on a top cover body 21, thereby connecting two electrode assemblies in series or in parallel. It can be understood that multiple connection groups can also be set side by side on a top cover body 21 to form multiple electrode assemblies in series or electrode assemblies in parallel.

[0197] 7 , the first exposed portion 222 is integrally formed with the first connecting portion 221 and the third connecting portion 223. The integral structure facilitates integration with the top cover body 21, reduces processing steps, and improves connection reliability.

[0198] In some embodiments, referring to Figure 7, the first connection portion 221 is connected to the third connection portion 223 through a first bending portion 224, the first bending portion 224 is bent relative to the first connection portion 221 and the third connection portion 223, one end of the first connection portion 221 in the first direction X is connected to the first exposed portion 222, the other end of the first connection portion 221 in the first direction X is connected to one end of the first bending portion 224, the other end of the first bending portion 224 is connected to one end of the third connection portion 223 in the first direction X, and the third connection portion 223 extends parallel to the first connection portion 221.

[0199] The first connection portion 221 and the third connection portion 223 are connected via the first bending portion 224 to form a substantially U-shaped integral structure, which facilitates integral molding with the top cover body 21 , reduces processing steps, and improves connection reliability.

[0200] Optionally, the first exposed portion 222 may be formed to be equal in length to the first connecting portion 221 in the second direction Y as shown in FIG. 5 , or may be formed to be shorter than the first connecting portion 221 in the second direction Y as shown in FIG. 7 .

[0201] When the first exposed portion 222 is shorter than the first connecting portion 221, the first exposed portion 222 can optionally be formed at one end of the first connecting portion 221 as shown in Figure 7, or can be formed in the middle part between the two ends of the first connecting portion 221 (not shown in the figure).

[0202] Optionally, the first connecting member 221 can be arranged on the top cover body 21 with the first exposed portion 222 located near one end of the top cover body 21 along the second direction Y as shown in Figure 7, or it can be arranged on the top cover body 21 with the first exposed portion 222 located in the middle part of the top cover body 21 along the second direction Y (not shown in the figure).

[0203] In some embodiments, referring to FIG7 , two second connectors 23 are arranged side by side along the third direction Z, the first connector 22 and the second connector 23 are arranged side by side along the second direction Y, and the first electrode assembly and the second electrode assembly can be arranged side by side along the third direction Z. That is, the first connecting portion 221 of the first connector 22 and the second connector 23 located on the same side as the first connecting portion 221 along the third direction Z are respectively connected to the positive electrode tab and the negative electrode tab of the same electrode assembly (e.g., the first electrode assembly); the third connecting portion 223 of the first connector 22 and the second connector 23 located on the same side as the third connecting portion 223 along the third direction Z are respectively connected to the positive electrode tab and the negative electrode tab of another electrode assembly (e.g., the second electrode assembly).

[0204] 24 to 26 , an insulating shielding member 25 is disposed between the second connecting portions 231 of two adjacent second connecting members 23. The insulating shielding member 25 can be an independent component or a part of the top cover body 21.

[0205] The insulating shielding member 25 can block the positive electrode tab and the negative electrode tab connected to the connection surfaces of two adjacent second connecting portions 231 to prevent short circuit and improve battery reliability.

[0206] In some embodiments, referring to FIG. 24 to FIG. 26 , the insulating shielding member 25 protrudes from both ends of the second connecting member 23 along the first direction X.

[0207] Exemplarily, the insulating shielding member 25 protrudes along the first direction X from one end of the second connecting member 23 toward the electrode assembly 30 .

[0208] Exemplarily, the insulating shielding member 25 protrudes along the first direction X from an end of the second connecting member 23 facing away from the electrode assembly 30 .

[0209] Electrical clearance refers to the shortest spatial distance measured between two conductive parts or between a conductive part and the protective interface of the equipment.

[0210] Creepage distance is the shortest path between two conductive parts or between a conductive part and the protective interface of the equipment measured along the insulating surface.

[0211] In the embodiment of the present disclosure, the insulating shielding member 25 protrudes from both ends of the second connecting member 23 along the first direction X, so that the two second connecting members 23 can be better separated at both ends of the first direction X, which is beneficial to increase the electrical gap and creepage distance between the two second connecting members 23 and improve the insulation performance.

[0212] For example, the insulating shielding member 25 may not protrude from the second connecting member 23 along the first direction X.

[0213] In some embodiments, referring to FIG. 26 , the battery 4 further includes an insulating support 26 connected to the insulating shielding member 25 , and insulating supports 26 are provided on opposite sides of the insulating shielding member 25 along the direction in which the two second connecting members 23 are arranged. The insulating support 26 is located on the side of the top cover body 21 facing the electrode assembly 30 along the first direction X, and the end of the second connecting portion 231 facing away from the second exposed portion 232 is against the side of the insulating support 26 facing the top cover body 21.

[0214] The insulating support 26 is a structure for supporting the second connecting member 23 along the first direction X toward the electrode assembly 30 .

[0215] Exemplarily, the insulating shielding member 25 is connected to the insulating support 26 on one side thereof along the arrangement direction of the two second connectors 23 , and the insulating shielding member 25 is connected to the insulating support 26 on the other side thereof along the arrangement direction of the two second connectors 23 .

[0216] Exemplarily, the insulating platform 26 is located inside the housing 10 .

[0217] In the embodiment of the present disclosure, the insulating platforms 26 on both sides of the insulating shielding member 25 respectively support the second connection parts 231 of the two second connectors 23 away from one end of the second exposed part 232, so that the second connection part 231 of one of the two second connectors 23 is away from one end of the second exposed part 232, and the distance from the surface of the insulating shielding member 25 through the insulating platform 26 to the second connection part 231 of the other second connector 23 is increased, thereby increasing the creepage distance between the corresponding second connection parts 231 of the two second connectors 23 and improving the insulation performance.

[0218] It is understandable that the battery 4 may not be provided with the insulating support 26 .

[0219] In some embodiments, referring to FIG. 26 , among the second connection portions 231 of two adjacent second connection members 23 , the second connection portion 231 of each second connection member 23 has a side facing away from the other second connection portion 231 that protrudes from the insulating support 26 .

[0220] For example, referring to FIG. 26 , the second connection portions 231 of the two second connection members 23 , which are opposite to each other, protrude from the insulating support.

[0221] In the embodiment of the present disclosure, the second connection portion 231 of each second connecting member 23 protrudes from the insulating platform 26 on the side facing away from the corresponding other second connection portion 231, so that the positive pole tab 31 or the negative pole tab 32 connected to the second connection portion 231 will hardly contact the insulating platform 26, reducing the possibility of interference between the insulating platform 26 and the positive pole tab 31 or the negative pole tab 32.

[0222] In some embodiments, along the arrangement direction of two adjacent second connecting members 23 , the insulating support may protrude from the second connecting portion 231 .

[0223] In some embodiments, referring to FIG. 26 , the insulating shielding member 25 includes an insulating main body 251 and an insulating auxiliary member 252. The insulating main body 251 is connected to the side of the insulating support 26 facing the top cover body 21, and the insulating main body 251 is clamped between the second connecting portions 231 of the two adjacent second connecting members 23. The insulating auxiliary member 252 is connected to the side of the insulating support 26 facing away from the top cover body 21, and the thickness of the insulating auxiliary member 252 along the arrangement direction of the two adjacent second connecting members 23 is less than the thickness of the insulating main body 251 along the arrangement direction of the two adjacent second connecting members 23, and the dimension of the insulating auxiliary member 252 along the first direction X is greater than the thickness of the insulating auxiliary member 252 along the arrangement direction of the two adjacent second connecting members 23.

[0224] The insulating body 251 is clamped between the second connection portions 231 of two adjacent second connectors 23 to separate the two second connectors 23 . The insulating body 251 is a structure for separating the two second connectors 23 and can mainly provide a suitable electrical gap between the two adjacent second connectors 23 .

[0225] The insulating auxiliary member 252 is located on the side of the insulating support 26 facing away from the top cover body 21. Two adjacent second connectors 23 are connected to the positive electrode tab 31 or negative electrode tab 32 of the corresponding electrode assembly, so that the insulating auxiliary member 252 is located between the positive electrode tab 31 and / or negative electrode tab 32 of the two adjacent electrode assemblies. The insulating auxiliary member 252 can effectively separate the side of the positive electrode tab 31 and / or negative electrode tab 32 facing away from the top cover body 21.

[0226] For example, referring to FIG. 26 , the thickness of the insulating body 251 along the arrangement direction of two adjacent second connectors 23 is D4, and the thickness of the insulating auxiliary member 252 along the arrangement direction of two adjacent second connectors 23 is D5. <D4。

[0227] Exemplarily, referring to FIG. 26 , the dimension of the insulating auxiliary component 252 along the first direction X is D6, and D6>D5.

[0228] In the embodiment of the present disclosure, since the dimension of the insulating auxiliary component 252 along the first direction X is greater than the thickness of the insulating auxiliary component 252 along the arrangement direction of two adjacent second connectors 23, the creepage distance between the second connectors 23 of two adjacent second connectors 23 is mainly provided by the dimension of the insulating auxiliary component 252 along the first direction X. Reducing the thickness of the insulating auxiliary component 252 along the arrangement direction of two adjacent second connectors 23 has little effect on the creepage distance between the second connection portions 231 of two adjacent second connectors 23. Since the dimension of the insulating auxiliary component 252 along the first direction X is greater than the thickness of the insulating auxiliary component 252 along the arrangement direction of two adjacent second connectors 23, the area of ​​the insulating auxiliary component 252 in the cross section perpendicular to the arrangement direction of the two adjacent second connectors 23 is larger. Reducing the thickness of the insulating auxiliary component 252 along the arrangement direction of the two adjacent second connectors 23 is conducive to minimizing the mass of the insulating auxiliary component 252 and improving the mass energy density. Therefore, by making the thickness of the insulating auxiliary part 252 along the arrangement direction of the two adjacent second connectors 23 smaller than the thickness of the insulating main body 251 along the arrangement direction of the two adjacent second connectors 23, the thickness of the insulating auxiliary part 252 is smaller. While minimizing the impact on the creepage distance between the second connection parts 231 of the two adjacent second connectors 23, the mass of the insulating auxiliary part 252 can be minimized, which is beneficial to improving the mass energy density of the battery.

[0229] In some embodiments, the thickness of the insulating auxiliary member 252 along the arrangement direction of two adjacent second connectors 23 may be greater than or equal to the thickness of the insulating body 251 along the arrangement direction of two adjacent second connectors 23 .

[0230] In some embodiments, referring to FIG. 26 , the insulating shielding member 25 further includes an insulating separator 253, which is connected to the side of the insulating body 251 away from the insulating base 26, and the insulating separator 253 protrudes from the side of the second exposed portion 232 away from the second connection portion 231 along the first direction X. The thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connection members 23 is less than the thickness of the insulating body 251 along the arrangement direction of the two adjacent second connection members 23, and the size of the insulating separator 253 along the first direction X is greater than the thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connection members 23.

[0231] The insulating spacer 253 mainly serves to separate and insulate the second exposed portion 232 .

[0232] The insulating spacer 253 protrudes from the second exposed portion 232 to increase the creepage distance between the second exposed portions 232 of two adjacent second connectors 23 .

[0233] For example, referring to FIG. 26 , the thickness of the insulating spacer 253 along the arrangement direction of two adjacent second connectors 23 is D7, D7 <D4。

[0234] Exemplarily, referring to FIG. 26 , a dimension of the insulating spacer 253 along the first direction X is D8 , where D8 > D7 .

[0235] In the embodiment of the present disclosure, since the size of the insulating separator 253 along the first direction X is greater than the thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connectors 23, the creepage distance between the second exposed portions 232 of the two adjacent second connectors 23 is mainly provided by the size of the insulating separator 253 along the first direction X. Reducing the thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connectors 23 has little effect on the creepage distance between the second exposed portions 232 of the two adjacent second connectors 23. Since the size of the insulating separator 253 along the first direction X is greater than the thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connectors 23, the area of ​​the insulating separator 253 in the cross section perpendicular to the arrangement direction of the two adjacent second connectors 23 is larger. Reducing the thickness of the insulating separator 253 along the arrangement direction of the two adjacent second connectors 23 is beneficial to reducing the mass of the insulating separator 253 as much as possible, which is beneficial to improving the mass energy density of the battery.

[0236] In some embodiments, the thickness of the insulating spacer 253 along the arrangement direction of two adjacent second connectors 23 may be greater than or equal to the thickness of the insulating body 251 along the arrangement direction of two adjacent second connectors 23 .

[0237] In some embodiments, referring to Figures 8 to 10, the first connecting member 22 includes, in addition to the first exposed portion 222 and the first connecting portion 221, a third connecting portion 223 connected to the first connecting portion 221, the first connecting portion 221 includes a connecting surface extending along the first direction X, and the third connecting portion 223 also includes a connecting surface extending along the first direction X; the second connecting member 23 includes, in addition to the second exposed portion 232 and the second connecting portion 231, a fourth connecting portion 241 connected to the second connecting portion 231, the second connecting portion 231 includes a connecting surface extending along the first direction X, and the fourth connecting portion 241 also includes a connecting surface extending along the first direction X.

[0238] The battery 4 may include at least two electrode assemblies 30, wherein the positive electrode tab 31 of one electrode assembly 30 may be connected to the first connecting portion 221 of the first connector 22, and the negative electrode tab 32 of the electrode assembly 30 may be connected to the second connecting portion 223 of the second connector 23. The positive electrode tab 31 of the other electrode assembly 30 may be connected to the third connecting portion 223 of the first connector 22, and the negative electrode tab 32 of the electrode assembly 30 may be connected to the fourth connecting portion 241 of the second connector 23. Thus, the two electrode assemblies 30 are connected in parallel to form a parallel electrode assembly. That is, the tab connected to the connecting surface of the first connecting portion 221 and the tab connected to the connecting surface of the third connecting portion 223 have the same polarity, and the tab connected to the connecting surface of the second connecting portion 231 and the tab connected to the connecting surface of the fourth connecting portion 241 have the same polarity.

[0239] A first connector 22 and a second connector 23, each including two connecting portions, can be considered as a connection group, and each connection group is used for a corresponding electrode assembly parallel body. More electrode assemblies 30 (e.g., 4, 6, 8) and more first connectors 22 (e.g., 4, 6, 8) and second connectors 23 (e.g., 4, 6, 8) can be used to form more electrode assembly parallel bodies connected by connection groups.

[0240] As an example, the multiple electrode assemblies 30 include a first electrode assembly and a second electrode assembly, one of the connecting surface of the first connecting portion 221 and the connecting surface of the second connecting portion 231 is connected to the positive electrode tab 31 of the first electrode assembly, and the other is connected to the negative electrode tab 32 of the first electrode assembly; one of the connecting surface of the third connecting portion 223 and the connecting surface of the fourth connecting portion 241 is connected to the positive electrode tab 31 of the second electrode assembly, and the other is connected to the negative electrode tab 32 of the second electrode assembly, the tab connected to the connecting surface of the first connecting portion 221 and the tab connected to the connecting surface of the third connecting portion 223 have the same polarity, and the tab connected to the connecting surface of the second connecting portion 231 and the tab connected to the connecting surface of the fourth connecting portion 241 have the same polarity.

[0241] Thus, at least two electrode assemblies without bent tabs are connected in parallel through one top cover 20 , thereby improving connection reliability and parallel connection efficiency.

[0242] In one example, the connection surface of the first connection portion 221 is connected to the positive electrode tab 31 of the first electrode assembly, the connection surface of the second connection portion 231 is connected to the negative electrode tab 32 of the first electrode assembly, the connection surface of the third connection portion 223 is connected to the positive electrode tab 31 of the second electrode assembly, and the connection surface of the fourth connection portion 241 is connected to the negative electrode tab 32 of the second electrode assembly.

[0243] In another example, the connection surface of the first connection portion 221 is connected to the negative electrode tab 32 of the first electrode assembly, the connection surface of the second connection portion 231 is connected to the positive electrode tab 31 of the first electrode assembly, the connection surface of the third connection portion 223 is connected to the negative electrode tab 32 of the second electrode assembly, and the connection surface of the fourth connection portion 241 is connected to the positive electrode tab 31 of the second electrode assembly.

[0244] The first connecting member 22 and the second connecting member 23 can constitute a connecting group, and each connecting group can connect two electrode assemblies in parallel. Figure 10 exemplarily shows that a connecting group is set on a top cover body 21, thereby connecting two electrode assemblies in parallel. It can be understood that multiple connecting groups can also be set side by side on a top cover body 21, thereby connecting multiple electrode assemblies in parallel.

[0245] In some embodiments, the first connecting portion 221, the first exposed portion 222, and the third connecting portion 223 are integrally formed; and the second connecting portion 231, the second exposed portion 232, and the fourth connecting portion 241 are integrally formed. This facilitates and makes the connection with the positive and negative electrode tabs more reliable, improves battery reliability, and reduces the number of parts.

[0246] In some embodiments, referring to Figure 10, the first connection portion 221 is connected to the third connection portion 223 through the first bending portion 224, the first bending portion 224 is bent relative to the first connection portion 221 and the third connection portion 223, one end of the first connection portion 221 in the first direction X is connected to the first exposed portion 222, the other end of the first connection portion 221 in the first direction X is connected to one end of the first bending portion 224, the other end of the first bending portion 224 is connected to one end of the third connection portion 223 in the first direction X, and the third connection portion 223 extends parallel to the first connection portion 221.

[0247] The second connection portion 231 and the fourth connection portion 241 are connected through the second bending portion 234, and the second bending portion 234 is bent relative to the second connection portion 231 and the fourth connection portion 241. One end of the second connection portion 231 in the first direction X is connected to the second exposed portion 232, and the other end of the second connection portion 231 in the first direction X is connected to one end of the second bending portion 234, and the other end of the second bending portion 234 is connected to one end of the fourth connection portion 241 in the first direction X. The fourth connection portion 241 extends parallel to the second connection portion 231.

[0248] The first connection part 221 and the third connection part 223 are connected through the first bending part 224 to form a roughly U-shaped integrated structure; the second connection part 231 and the fourth connection part 241 are connected through the second bending part 234 to form a roughly U-shaped integrated structure, which is convenient for connecting with the positive electrode tab and the negative electrode tab of the electrode assembly respectively, and the parallel connection of the electrode assembly is more reliable, thereby improving the reliability of the battery.

[0249] In some embodiments, the first connector 22 and the second connector 23 are arranged side by side along the second direction Y, the first connector 221 and the second connector 231 are located on the same side in the third direction Z, and the third connector 223 and the fourth connector 241 are located on the other side in the third direction Z. Thus, one top cover 20 can connect two electrode assemblies that are arranged side by side along the third direction Z in parallel.

[0250] In addition, the embodiment shown in Figure 5, the embodiment shown in Figure 7, and the embodiment shown in Figure 10 can be combined with each other. The embodiment shown in Figure 5 can be used to form a series of electrode assemblies or a parallel electrode assembly; the embodiment shown in Figure 7 can be used to form a series of electrode assemblies or a parallel electrode assembly; and the embodiment shown in Figure 10 can be used to form a parallel electrode assembly. Therefore, the above embodiments can be used individually or in combination according to the requirements of series, parallel, or mixed connection of electrode assemblies.

[0251] In some embodiments, the first exposed portion 222 is connected to the first connecting portion 221 via a first flow bottleneck 225. And / or, the second exposed portion 232 is connected to the second connecting portion 231 via a second flow bottleneck.

[0252] Referring to Figure 7, the example of the first exposed portion 222 and the first connecting portion 221 being connected via the first overcurrent bottleneck 225 is explained. The first overcurrent bottleneck 225 is configured to melt when the current passing through the first connector 22 is too large (when it reaches the bottleneck), thereby disconnecting the first exposed portion 222 from the first connecting portion 221, eliminating the excessive current from spreading to the electrode assembly 30, reducing the risk of thermal runaway, and improving battery reliability. It can be seen that the so-called overcurrent bottleneck refers to the portion of the first connector 22 or the second connector 23 with the lowest current carrying capacity (the smallest current allowed to pass). When excessive current continues to pass through this portion, the portion may melt, thereby cutting off the current path.

[0253] In some embodiments, a cross-sectional area of ​​the first flow bottleneck 225 is smaller than a cross-sectional area of ​​the first connecting portion 221 .

[0254] Here, the cross-sectional area refers to the area of ​​the conductor's cross section perpendicular to the current direction. In the example shown in FIG7 , for the first current bottleneck 225 , the current direction is consistent with the first direction X, and the cross section is parallel to both the second direction Y and the third direction Z.

[0255] In the example shown in FIG7 , the first current flow bottleneck 225 is formed by two thin strips connected to the first connecting portion 221 and extending along the first direction X. The conductor between the two strips is removed. Of course, there may be only one thin strip. The current flow bottleneck may also be formed in other suitable forms.

[0256] The cross-sectional area of ​​the first overcurrent bottleneck 225 is smaller than that of the first connecting portion 221. When the current flowing through the first connecting member is too large, the first overcurrent bottleneck 225 will be melted before the first connecting portion 221, thereby cutting off the first exposed portion 222 and the first connecting portion 221, suppressing or eliminating the excessive current from spreading to the electrode assembly 30, and reducing the risk of thermal runaway.

[0257] Similarly, the cross-sectional area of ​​the second flow bottleneck is smaller than the cross-sectional area of ​​the second connecting portion.

[0258] For example, the first flow bottleneck 225 includes an electrical connection portion narrower than the first exposed portion 222 and the first connection portion 221. The second flow bottleneck includes an electrical connection portion narrower than the second exposed portion and the second connection portion.

[0259] In some embodiments, the first connector 22 and the second connector 23 are respectively injection molded with the top cover body 21. Thus, the first connector 22 and the second connector 23 are integrated with the top cover body 21, and the connection is more stable, thereby improving battery reliability.

[0260] In some embodiments, a locking step 211 (as shown in FIG11 ) is provided on the bottom surface of the top cover body 21 away from the top surface along the first direction X. The top cover body 21 cooperates with the opening edge of the shell 10 through the locking step 211 to close the opening of the shell 10 .

[0261] In some embodiments, referring to FIG. 14 to FIG. 17 and FIG. 22 , the housing 10 has a pressure relief port 12 , which is in communication with the accommodating space 11 .

[0262] The pressure relief port 12 is an opening for the gas in the accommodating space 11 to escape.

[0263] In the embodiment of the present disclosure, the pressure relief port 12 is connected to the accommodating space 11 of the shell 10 , and the thermal runaway gas in the accommodating space 11 can be discharged through the pressure relief port 12 , thereby achieving pressure relief in the accommodating space 11 .

[0264] In some embodiments, referring to FIG. 14 to FIG. 17 , the battery 4 further includes a pressure relief cover connected to the housing 10 , and the pressure relief cover is disposed over the pressure relief port 12 .

[0265] The pressure relief cover is a sealing structure provided on the pressure relief port 12 .

[0266] Exemplarily, referring to FIG. 14 to FIG. 17 , the pressure relief cover is a flame retardant cover 904 .

[0267] In the embodiment of the present disclosure, the pressure relief cover is provided on the pressure relief port 12 , which can block the storage space 11 connected to the pressure relief port 12 to a certain extent, inhibit objects in the storage space 11 from falling out, and reduce the possibility of external debris entering the storage space 11 .

[0268] In some embodiments, the pressure relief cover is an insulating film, and the melting point of the insulating film is less than or equal to 500°C.

[0269] Illustratively, the melting point of the insulating film may be 100°C, 200°C, 300°C, 400°C, or 500°C.

[0270] In the disclosed embodiment, the pressure relief cover is an insulating film, which helps reduce the possibility of shorting the electrode assembly 30 within the housing 10. The melting point of the insulating film is less than or equal to 500°C. This relatively low melting point facilitates thermal runaway gas within the accommodation space 11 to melt through the insulating film, thereby relieving the pressure in the accommodation space 11.

[0271] In some embodiments, the pressure relief cap has a weakened area for pressure relief.

[0272] The pressure relief cover refers to the area on the pressure relief cover with smaller pressure bearing capacity.

[0273] Gas is continuously injected into the accommodating space 11 , and the area on the pressure relief cover that is damaged first is the weakened area of ​​the pressure relief cover.

[0274] In the embodiment of the present disclosure, by providing a weakened area on the pressure relief cover, the pressure relief cover can better shield the pressure relief port 10 when no thermal runaway occurs, and can better relieve pressure when thermal runaway occurs.

[0275] In some embodiments, the wall thickness of the weakened area is less than the wall thickness of the remainder of the pressure relief cover.

[0276] Illustratively, the weakened area is a score on the pressure relief cover.

[0277] In the embodiment of the present disclosure, by providing an area with a smaller wall thickness on the pressure relief cover, the strength of the pressure relief cover in the area with smaller wall thickness is lower due to the smaller wall thickness, the pressure bearing capacity of the pressure relief cover in the area with smaller wall thickness is lower, and the pressure relief cover in the area with smaller wall thickness is weakened relative to other areas, which is beneficial for the pressure relief cover to relieve pressure in the area with smaller wall thickness.

[0278] In some embodiments, the battery 4 further includes a sealing bag, which is sleeved on the outside of the electrode assembly 30 and is located inside the shell 10 .

[0279] Illustratively, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0280] The sealed bag and the electrode assembly located in the sealed bag constitute a soft-pack battery cell.

[0281] The electrolyte is sealed in a sealing bag, so that the electrode assembly 30 is immersed in the electrolyte.

[0282] The specific embodiments of the present disclosure are further described below.

[0283] An embodiment of the present disclosure provides a battery, as shown in FIG7 , the battery includes: a shell 10, a top cover assembly 20 and an electrode assembly 30. The shell 10 defines a accommodating space and has an opening on one side; the top cover assembly 20 is provided on the shell 10 and closes the opening, the top cover assembly 20 includes a top cover body 21 and a first conductive connector 22 and two second connectors 23 spaced apart from each other and provided on the top cover body 21, the first connector 22 includes a first connecting portion 221 and a third connecting portion 223 connected to each other, and a first exposed portion 222 bent and connected to the first connecting portion 221; each second connecting portion 23 includes a second connecting portion 231 and a second exposed portion 232 bent and connected to the second connecting portion 231, the first connecting portion 221, the second connecting portion 231, and the two third connecting portions 223 all include a connecting surface extending along the first direction X, and the first exposed portion 222 and the second exposed portion 232 are both exposed to the outside of the shell 10; The electrode assembly 30 is accommodated in the accommodating space, and two electrode assemblies are provided. Each electrode assembly 30 includes a positive electrode tab 31 and a negative electrode tab 32 extending without bending along the first direction X. The connection surface of the first connecting portion 221 is connected to the positive electrode tab 31 of one electrode assembly 30, and the connection surface of the second connecting portion 231 of a second connecting member located on the same side as the first connecting portion 221 along the third direction Z is connected to the negative electrode tab 32 of the one electrode assembly 30, the third connecting portion 223 is connected to the negative electrode tab 32 of another electrode assembly 30, and the second connecting portion 231 of another second connecting member 23 located on the same side as the third connecting portion 223 along the third direction Z is connected to the positive electrode tab 31 of the other electrode assembly 30, thereby realizing a top cover assembly 20 connecting two electrode assemblies 30 in series.

[0284] The top cover body 21 is provided with an insulating shielding portion 25 located between the second connecting portions 231 of the two second connecting members 23 , for preventing the negative electrode tab 32 and the positive electrode tab 31 connected to the two second connecting portions 231 from short circuiting.

[0285] An overcurrent bottleneck 225 is provided between the first exposed portion 222 and the first connecting portion 221, which is used to melt when the current passing through the first connecting member 22 is too large (when it reaches the bottleneck), thereby cutting off the first exposed portion 222 and the first connecting portion 221, eliminating the excessive current from spreading to the electrode assembly 30, reducing the risk of thermal runaway, and improving battery reliability.

[0286] 2 , multiple batteries 4 can be connected via a top cover assembly 20 and further grouped to form a battery pack 100 .

[0287] Another embodiment of the present disclosure provides a battery, as shown in FIG10 , comprising: a housing 10 , a top cover assembly 20 , and an electrode assembly 30 . The housing 10 defines a storage space and has an opening on one side; the top cover assembly 20 is disposed on the housing 10 and closes the opening. The top cover assembly 20 comprises a top cover body 21 and a first connecting member 22 and a second connecting member 23 that are electrically conductive and disposed on the top cover body 21 . The first connecting member 22 comprises a first connecting portion 221 and a third connecting portion 223 that are connected to each other, and a first exposed portion 222 that is bent and connected to the first connecting portion 221 . The second connecting member 23 comprises a second connecting portion 231 and a fourth connecting portion 241 that are connected to each other, and a second exposed portion 232 that is bent and connected to the second connecting portion 231 . The first connection part 221, the second connection part 231, the third connection part 223, and the fourth connection part 241 all include connection surfaces extending along the first direction X, and the first exposed part 222 and the second exposed part 232 are both exposed to the outside of the shell 10; the electrode assembly 30 is accommodated in the accommodating space, and there are two electrode assemblies. Each electrode assembly 30 includes a positive electrode tab 31 and a negative electrode tab 32 extending without bending along the first direction X. The connection surface of the first connection part 221 is connected to the positive electrode tab 31 of one electrode assembly 30, the connection surface of the second connection part 231 is connected to the negative electrode tab 32 of the one electrode assembly 30, the third connection part 223 is connected to the positive electrode tab 31 of the other electrode assembly 30, and the fourth connection part 241 is connected to the negative electrode tab 32 of the other electrode assembly 30, thereby realizing that one top cover assembly 20 is connected to the two electrode assemblies 30 in parallel.

[0288] The battery provided in the embodiment of the present disclosure is described above by way of example. Furthermore, the embodiment of the present disclosure further provides a top cover assembly 20 for the battery described above. The structure of the top cover assembly 20 is as described above and will not be further described here.

[0289] The present disclosure further provides a battery pack 100, comprising: at least one battery 4 as mentioned above; and at least one current collector component electrically connecting the batteries 4 by electrically connecting to the first exposed portion 222 and the second exposed portion 232. The batteries 4 may be connected in series, in parallel, or in a mixed connection.

[0290] Since the battery 4 provided in the embodiment of the present disclosure does not need to bend the tabs to achieve connection between the tabs and the connectors, the risk of tab breakage is reduced, thereby improving the reliability of the battery pack 100.

[0291] Although not shown in the figures, the battery pack 100 may further include a case for accommodating one or more batteries 4. In some embodiments, the case also includes a cover to enclose the space accommodating the batteries 4. In the battery pack 100, multiple batteries 4 may be arranged along the second direction Y and / or the third direction Z.

[0292] In some embodiments, referring to FIG. 2 , the top cover assemblies 20 of adjacent batteries 4 are connected to each other, and each top cover assembly 20 respectively closes the opening of its corresponding housing 10 .

[0293] In each battery 4, the tab is connected to the top cover assembly, and multiple top cover assemblies 20 are connected in pairs to form a battery pack 100. Compared with the traditional method of first grouping the batteries (electrode assemblies) and then connecting the tabs and connectors, it is convenient to connect the tabs and connectors, and reduces or even eliminates the risk of the tabs breaking due to bending, and the connection reliability is higher.

[0294] In some embodiments, among two adjacent top cover assemblies 20, one top cover assembly 20 is provided with a snap-fit ​​protrusion 212 (as shown in Figure 5), and the other top cover assembly 20 is provided with a snap-fit ​​groove, and the top cover assemblies 20 of adjacent batteries 4 are connected to each other through the snap-fitting cooperation between the snap-fit ​​protrusion 212 and the snap-fit ​​groove.

[0295] As shown in FIG5 , one of the two end surfaces of the top cover body 21 in the third direction Z can be formed with a ridge extending in the second direction Y, and the other can be formed with a groove extending in the second direction Y. The ridge of one top cover body 21 mates with the groove of the adjacent other top cover body 21 to achieve the splicing of the two top cover bodies 21. The first exposed portion 222 and the second exposed portion 232 provided on the top cover body 21 can be connected by a busbar. This allows the batteries 4 to be arranged close to each other and electrically connected into groups.

[0296] The engagement of the engaging protrusions 212 of the top cover assemblies 20 of adjacent batteries 4 with the engaging grooves enables the battery pack 100 to be formed into a group, thereby improving the grouping efficiency.

[0297] In some embodiments, the battery pack 100 contains multiple batteries 4. The connection method (series or parallel) of the electrode assemblies of these batteries 4, as well as the shape and combination of the first connector 22 and the second connector 23 in the top cover assembly 20, can be the same or different.

[0298] The present disclosure further provides an electric device 1000 , comprising at least one battery 4 or at least one battery pack 100 for providing electric energy.

[0299] The present disclosure further provides an energy storage device, including at least one battery 4 or at least one battery pack 100 , wherein the battery can store electrical energy and provide electrical energy.

[0300] A battery manufacturing method provided by the present disclosure is described below.

[0301] 13 , the present disclosure provides a battery manufacturing method comprising:

[0302] S01: a top cover assembly forming step of forming a first conductive connector and a second conductive connector on the top cover body to form an integrated top cover assembly, wherein the first connector includes a first connecting portion and a first exposed portion connected to the first connecting portion, and the second connector includes a second connecting portion and a second exposed portion connected to the second connecting portion;

[0303] S02: a tab connecting step of connecting one of the connecting surface of the first connecting portion and the connecting surface of the second connecting portion of the top cover assembly to the positive electrode tab or the negative electrode tab surface of the electrode assembly, and connecting the other to the positive electrode tab or the negative electrode tab surface of the electrode assembly not connected to the first connecting portion, wherein the positive electrode tab, the negative electrode tab, the connecting surface of the first connecting portion, and the connecting surface of the second connecting portion all extend along the first direction;

[0304] S03 Electrode assembly into the shell step: the electrode assembly connected to the top cover assembly is accommodated in the accommodation space defined by the shell from the opening of the shell, and the opening is closed by the top cover assembly, wherein the first exposed portion and the second exposed portion are exposed to the outside of the shell.

[0305] Since the extension direction of the connection surface of the first connecting part and the second connecting part is the same as the extension direction of the positive electrode tab and the negative electrode tab, the positive electrode tab and the negative electrode tab can be connected to the first connecting part and the second connecting part respectively without bending, eliminating the step of bending the tabs, reducing the risk of tab breakage, improving connection reliability, and improving battery manufacturing efficiency.

[0306] In some embodiments, the step of forming the top cover assembly S01 includes:

[0307] The first connecting piece, the second connecting piece and the top cover body are formed into an integrated top cover assembly through injection molding.

[0308] The first connecting member, the second connecting member and the top cover body form an injection-molded integral structure, which makes the connection more stable, thereby improving the reliability of the battery.

[0309] In some embodiments, the step of connecting the tabs S03 includes:

[0310] Connecting one of the connecting surface of the first connecting portion of the first connector and the connecting surface of the second connecting portion of the second connector to the positive electrode tab of the first electrode assembly, and connecting the other to the negative electrode tab of the first electrode assembly;

[0311] One of the connecting surface of the third connecting portion in the first connecting member and the connecting surface of the second connecting portion in another second connecting member is connected to the positive electrode tab of the second electrode assembly, and the other is connected to the negative electrode tab of the second electrode assembly, wherein the third connecting portion is connected to the first connecting portion, the polarity of the tab connected to the connecting surface of the first connecting portion is opposite to the polarity of the tab connected to the connecting surface of the third connecting portion, and the polarity of the tabs connected to the connecting surfaces of the second connecting portions of the two second connecting members are opposite.

[0312] Thus, at least two electrode assemblies without bent tabs can be connected in series through a top cover, thereby improving connection reliability and enhancing battery manufacturing efficiency.

[0313] In some embodiments, the step of connecting the tabs S02 includes:

[0314] Connecting one of the connection surface of the first connection portion and the connection surface of the second connection portion to the positive electrode tab of the first electrode assembly, and connecting the other to the negative electrode tab of the first electrode assembly;

[0315] One of the connecting surfaces of the third connecting part and the fourth connecting part of the top cover assembly is connected to the positive electrode tab of the second electrode assembly, and the other is connected to the negative electrode tab of the second electrode assembly, wherein the first connecting part is connected to the third connecting part, and the second connecting part is connected to the fourth connecting part, the tab connected to the connecting surface of the first connecting part has the same polarity as the tab connected to the connecting surface of the third connecting part, the tab connected to the connecting surface of the second connecting part has the same polarity as the tab connected to the connecting surface of the fourth connecting part, and the polarity of the tab connected to the first connecting part is opposite to the polarity of the tab connected to the second connecting part.

[0316] Thus, at least two electrode assemblies without bent tabs are connected in parallel through a top cover, thereby improving connection reliability and enhancing battery manufacturing efficiency.

[0317] In some embodiments, after the S02 electrode assembly shelling step, the method further includes: a battery grouping step: connecting the top cover assemblies of each battery in sequence.

[0318] Each battery can first be connected to the top cover assembly through the tabs, and then connected into groups through their own top cover assemblies to form a battery pack. Compared with the traditional method of first grouping the batteries and then connecting the tabs and connectors, it is easier to connect the tabs and connectors, and the connection reliability is higher.

[0319] Second embodiment:

[0320] Referring to Figures 14 to 16 , the battery 4 of the disclosed embodiment includes a wrapping structure 1, a conductive terminal 2, and a battery cell 3. The wrapping structure 1 forms a housing space 11, with a pressure relief vent 12 formed on one side of the wrapping structure 1 and connected to the housing space 11. The remainder of the wrapping structure 1 is a sealed structure. The conductive terminal 2 is connected to the wrapping structure 1, with the conductive terminal 2 and the pressure relief vent 12 located on different sides of the wrapping structure 1. The battery cell 3 is located within the housing space 11, and the tabs of the battery cell 3 are electrically connected to the conductive terminal 2.

[0321] The wrapping structure 1 is a structure wrapped around the battery cell 3 , and the accommodation space 11 of the wrapping structure 1 is mainly used to accommodate the battery cell 3 .

[0322] The conductive terminal 2 is electrically connected to the tab of the battery cell 3 , and the battery cell 3 supplies power to the outside through the conductive terminal 2 , or an external power source supplies power to the battery cell 3 through the conductive terminal 2 .

[0323] Exemplarily, the conductive terminal 2 is a tab, and multiple batteries 4 in the battery pack are connected in series, parallel, or in mixed connection via the tab.

[0324] Exemplarily, the battery cell 3 includes a bare cell and an outer packaging wrapped around the bare cell for protecting the bare cell. The bare cell includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet.

[0325] The package structure 1 is equivalent to the structure composed of the shell 10 and the top cover assembly 20 in the first embodiment.

[0326] The battery cell 3 is equivalent to a structure in which the electrode assembly 30 and the sealing bag are combined in the first embodiment.

[0327] The tabs include a positive electrode tab 31 and a negative electrode tab 32 .

[0328] A pressure relief vent 12 connected to the accommodating space 11 is formed on one side of the wrapping structure 1. The rest of the wrapping structure 1 is a sealed structure, meaning that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is substantially sealed. In other words, the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, can be completely sealed or partially sealed. In the event that the portion of the wrapping structure 1 covering the battery cell 3, except for the pressure relief vent 12, is not completely sealed, as long as the gaps at the incompletely sealed locations of the wrapping structure 1 can, to a certain extent, suppress the eruption of thermal runaway gases from the incompletely sealed locations of the wrapping structure 1, thereby guiding the thermal runaway gases to erupt from the pressure relief vent 12.

[0329] The conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1 , and the thermal runaway gas ejected from the pressure relief vent 12 can be as far away from the conductive terminal 2 as possible.

[0330] For example, the number of battery cells 3 in the packaging structure 1 may be one or at least two.

[0331] In the disclosed embodiment, if thermal runaway occurs in a battery cell 3 within the packaging structure 1 of a battery 4, due to the formation of a pressure relief vent 12 on one side of the packaging structure 1, which is connected to the accommodation space 11, the generated thermal runaway gas faces greater resistance to escape from the packaging structure 1 except for the pressure relief vent 12. This makes it difficult for the thermal runaway gas to flow out of the packaging structure 1 from other parts except the pressure relief vent 12. The packaging structure 1 guides the thermal runaway gas to eject from the packaging structure 1 through the pressure relief vent 12, thereby relieving the pressure in the accommodation space 11 within the packaging structure 1 and achieving a directional eruption of the thermal runaway gas. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the packaging structure 1, the thermal runaway gas ejected from the pressure relief vent 12 and the substances carried by the thermal runaway gas can be kept as far away from the conductive terminal 2 as possible.

[0332] In one embodiment, the battery cell 3 is a soft-pack battery cell.

[0333] The outer packaging of the bare cell of the soft-pack battery cell, which is used to protect the bare cell, is a plastic film.

[0334] Exemplarily, the plastic film is an aluminum-plastic film.

[0335] In the disclosed embodiment, when thermal runaway occurs in the battery cell 3 , the thermal runaway gas generated by the bare cell breaks through the plastic film and sprays in all directions. The thermal runaway gas is ejected directionally from the pressure relief port 12 under the guidance of the wrapping structure 1 .

[0336] It is understandable that the battery cell 3 is not limited to a soft-pack battery cell. For example, the battery cell 3 may be a hard-shell battery cell 3, wherein the bare cell of the hard-shell battery cell 3 is covered with an outer metal shell or plastic shell.

[0337] In one embodiment, referring to FIG. 23 , the number of batteries 4 in the battery pack box is at least two, and the at least two batteries 4 are arranged in sequence. The conductive terminals 2 of the at least two batteries 4 arranged in sequence are oriented in the same direction, and the orientation of the conductive terminals 2 of the at least two batteries 4 arranged in sequence is arranged crosswise to the direction in which the at least two batteries 4 are arranged in sequence.

[0338] The orientation of the conductive terminal 2 of the battery 4 refers to the direction of the side of the packaging structure 1 of the battery 4 facing the conductive terminal 2 .

[0339] For example, referring to FIG. 23 , in at least two batteries 4 arranged in sequence, the conductive terminals 2 are oriented perpendicular to the direction in which the at least two batteries 4 are arranged in sequence.

[0340] In the embodiment of the present disclosure, since the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the wrapping structure 1, and the conductive terminals 2 of at least two batteries 4 arranged in sequence are oriented in the same direction, in the at least two batteries 4 arranged in sequence, the orientation of the conductive terminal 2 is arranged crosswise with the direction in which the at least two batteries 4 are arranged in sequence, so that the pressure relief vents 12 of the at least two batteries 4 arranged in sequence can avoid the conductive terminals 2 of the at least two batteries 4 arranged in sequence, reducing the possibility that the thermal runaway gas ejected from the pressure relief vent 12 of any battery 4 in the at least two batteries 4 arranged in sequence will short-circuit the conductive terminal 2 of the adjacent battery 4, thereby facilitating the thermal runaway of the battery 4 from spreading to the adjacent battery.

[0341] In one embodiment, referring to Figures 15 and 16, the number of battery cells 3 in the battery 4 is at least two, and the conductive terminal 2 includes a sampling electrode 903 and at least two transfer electrodes 902, wherein one transfer electrode 902 is electrically connected to the tab of one of the battery cells 3, and the other transfer electrode 902 is electrically connected to the tab of the other battery cell 3, and the polarities of the tabs corresponding to the two transfer electrodes 902 are opposite, and the sampling electrode 903 is electrically connected to the tabs of the corresponding two battery cells 3, respectively, and the polarities of the tabs of the corresponding two battery cells 3 electrically connected to the sampling electrode 903 are opposite.

[0342] The tabs corresponding to at least two of the transfer electrodes 902 have opposite polarities, with one transfer electrode 902 having a positive polarity and the other having a negative polarity. The battery cells 3 of the battery 4 can be powered externally via the transfer electrodes 902 and can be charged via the transfer electrodes 902.

[0343] The sampling electrodes 903 are electrically connected to the tabs of two corresponding battery cells 3, respectively. The polarity of the tabs of the two corresponding battery cells 3 electrically connected to the sampling electrodes 903 is opposite. Each sampling electrode 903 is electrically connected to the positive tab of one battery cell 3 and the negative tab of another battery cell 3, and the battery cells 3 of the battery 4 are connected in series through the sampling electrodes 903.

[0344] When the battery cells 3 of the battery 4 are connected in series via the sampling electrode 903 , the switching electrode 902 is equivalent to the second connector 23 in the first embodiment, and two adjacent switching electrodes 902 are equivalent to two adjacent second connectors 23 in the first embodiment.

[0345] When the battery cells 3 of the battery 4 are connected in series via the sampling electrode 903 , the sampling electrode 903 is equivalent to the first connecting member 22 .

[0346] Exemplarily, referring to FIG. 15 and FIG. 16 , the switching electrode 902 and the sampling electrode 903 are both bars.

[0347] In the disclosed embodiment, the battery cells 3 of battery 4 are connected in series via sampling electrodes 903, and the battery cells 3 of battery 4 are powered or charged via adapter electrodes 902. Sampling electrodes 903 connect the battery cells 3 of battery 4 in series, and the potential of sampling electrode 903 is the potential between the two battery cells 3 connected in series. By measuring and sampling the voltage between sampling electrode 903 and the corresponding adapter electrode 902, the operating status of the corresponding battery cell 3 can be identified. Because the conductive terminal 2 and the pressure relief vent 12 are located on different sides of the package structure 1, the thermal runaway gas ejected from the pressure relief vent 12 can avoid the adapter electrode 902 and sampling electrode 903 as much as possible.

[0348] In one embodiment, referring to FIG. 14 to FIG. 16 , the battery 4 further includes a flame-retardant cover 904 covering the pressure relief port 12 , and the pressure bearing capacity of the package structure 1 is greater than that of the flame-retardant cover 904 .

[0349] Pressure bearing capacity refers to the ability to withstand fluid pressure.

[0350] The relative size of the pressure bearing capacity can be measured by filling the package structure 1 with gas. Specifically, because the flame-retardant cover 904 covers the pressure relief port 12, the package structure 1 and the flame-retardant cover 904 essentially seal the accommodation space 11. When gas is filled into the accommodation space 11, the air pressure in the accommodation space 11 continuously increases, and the gas pressure borne by the package structure 1 and the flame-retardant cover 904 continuously increases. As gas is continuously filled into the accommodation space 11, the flame-retardant cover 904 breaks before the package structure 1, that is, the pressure bearing capacity of the flame-retardant cover 904 is less than that of the package structure 1, and the bearing capacity of the package structure 1 is greater than that of the flame-retardant cover 904.

[0351] The flame retardant cover 904 has a certain flame retardant capability. In the event of thermal runaway of the battery 4, the flame retardant cover 904 may be deformed due to the high temperature, but will basically not be ignited.

[0352] In the embodiment of the present disclosure, the flame retardant cover 904 is provided on the pressure relief port 12. The flame retardant cover 904 has a certain flame retardant ability, which can reduce, to a certain extent, the possibility of the flame retardant cover 904 being ignited in the event of thermal runaway of the battery 4. The flame retardant cover 904 is provided on the pressure relief port 12. In the event of thermal runaway of the adjacent battery 4, it can reduce the thermal runaway gas generated by the adjacent battery 4 from entering the storage space 11 through the pressure relief port 12, which is beneficial to suppress the spread of thermal runaway to a certain extent. In the event of thermal runaway of the battery cell 3 in the storage space 11, since the bearing capacity of the wrapping structure 1 is greater than the bearing capacity of the flame retardant cover 904, the thermal runaway gas in the storage space 11 first breaks through the flame retardant cover 904, causing the thermal runaway gas in the storage space 11 to erupt directionally from the pressure relief port 12.

[0353] In one embodiment, referring to FIG. 14 to FIG. 16 , the flame retardant cover 904 may be made of mica.

[0354] Illustratively, the flame retardant cover 904 is mica paper.

[0355] Exemplarily, the mica paper is bonded to the wrapping structure 1 .

[0356] In the disclosed embodiment, the flame retardant cover 904 is made of mica, which has a certain flame retardancy and is substantially immune to ignition in the event of thermal runaway of the battery 4. A thinner flame retardant cover 904 made of mica may have a lower pressure bearing capacity.

[0357] In one embodiment, referring to FIG. 14 , the flame retardant cover 904 may be formed with notches 41 .

[0358] For example, referring to FIG. 14 , FIG. 16 and FIG. 17 , the notch 41 is located in the area corresponding to the pressure relief port 12 .

[0359] In the embodiment of the present disclosure, by processing the notch 41 on the flame retardant cover 904, the pressure bearing capacity of the flame retardant cover 904 can be reduced. In the event that thermal runaway occurs in the battery cell 3 in the accommodating space 11 of the wrapping structure 1, the thermal runaway gas in the accommodating space 11 is facilitated to break through the flame retardant cover 904 and eject from the pressure relief port 12.

[0360] In one embodiment, referring to FIG. 14 , the flame retardant cover 904 is formed with a through hole 42 communicating with the accommodating space 11 .

[0361] The through hole 42 on the flame retardant cover 904 passes through the flame retardant cover 904 .

[0362] In the embodiment of the present disclosure, part of the structure within the accommodating space 11 of the wrapping structure 1 needs to extend out of the accommodating space 11. This part of the structure extends out of the accommodating space 11 from the through hole 42 of the flame retardant cover 904. The position where the flame retardant cover 904 is provided is the pressure relief port 12 for pressure relief. Even if part of the structure of the accommodating space 11 extends out from the through hole 42, the through hole 42 does not need to be sealed, which is conducive to simplifying the structure of the battery 4.

[0363] In one embodiment, referring to Figures 16, 20 and 21, the battery 4 also includes a temperature-regulating container 5 partially located in the accommodating space 11, and a battery cell 3 is arranged on one side or two opposite sides of the temperature-regulating container 5. The temperature-regulating container 5 has a temperature-regulating cavity 51 and an inlet 52 and an outlet 53 respectively connected to the temperature-regulating cavity 51. The temperature-regulating container 5 is penetrated by the through hole 42 so that the inlet 52 and the outlet 53 are exposed outside the accommodating space 11 along the side of the wrapping structure 1 toward the flame-retardant cover 904.

[0364] The battery cells 3 generate heat during operation, and even in the event of thermal runaway, they generate significant heat. Fluid enters the temperature control chamber 51 of the temperature control container 5 through the inlet 52 and flows out of the temperature control chamber 51 through the outlet 53. The flow of fluid into and out of the temperature control chamber 51 regulates the temperature of the battery cells 3.

[0365] Exemplarily, the fluid flowing through the temperature regulating chamber 51 of the temperature regulating container 5 may be liquid or gas.

[0366] Exemplarily, liquid or gas with a relatively low temperature is introduced into the temperature regulating chamber 51 to cool the battery cells 3 .

[0367] Exemplarily, the temperature control container 5 may be an air bag.

[0368] For example, the material of the airbag may be rubber.

[0369] For example, referring to FIG. 16 and FIG. 20 , battery cells 3 are disposed on opposite sides of the temperature regulating container 5 .

[0370] For example, referring to FIG. 16 , the number of battery cells 3 on each side is two, and the two battery cells 3 on each side are connected in series via the sampling electrode 903 .

[0371] For example, referring to FIG. 20 , the number of battery cells 3 on each side is one.

[0372] Exemplarily, the number of battery cells 3 on each side is one, and the two battery cells 3 located on both sides of the temperature control container 5 are connected in series via the sampling electrode 903 .

[0373] In the disclosed embodiment, the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the accommodation space 11 through the through-hole 42 of the flame-retardant cover 904. This facilitates connecting the temperature-regulating container 5 to an external fluid source through the inlet 52 and outlet 53, allowing external fluid to enter the temperature-regulating container 5 through the inlet 52 and exit through the outlet 53, thereby regulating the temperature of the battery cell 3. Since the inlet 52 and outlet 53 of the temperature-regulating container 5 extend outside the accommodation space 11 through the through-hole 42 of the flame-retardant cover 904, the through-hole 42 does not need to be sealed, which helps simplify the structure of the battery 4.

[0374] It is understandable that what extends out of the accommodating space 11 of the packaging structure 1 from the through hole 42 of the flame retardant cover 904 is not necessarily the temperature regulating container 5, but may also be other structures partially located in the accommodating space 11 of the packaging structure 1 depending on the situation.

[0375] In one embodiment, referring to FIG. 21 , the temperature control container 5 includes a container body 54, a first guide plate 55, and a second guide plate 56. The temperature control chamber 51, the inlet 52, and the outlet 53 are all formed in the container body 54. The end of the container body 54 facing the pressure relief port 12 is the target end, and the outlet 53 and the inlet 52 are both located at the target end of the container body 54. The first guide plate 55 is located in the temperature control chamber 51. The first guide plate 55 is connected to the cavity wall of the temperature control chamber 51 facing the target end. The first guide plate 55 is spaced apart from the cavity wall of the temperature control chamber 51 facing away from the target end. There are multiple first guide plates 55, and multiple first guide plates 55 are located between the outlet 53 and the inlet 52. The second guide plate 56 is located in the temperature regulating chamber 51. The second guide plate 56 is spaced apart from the cavity wall of the temperature regulating chamber 51 toward the target end. The second guide plate 56 is connected to the cavity wall of the temperature regulating chamber 51 away from the target end. The second guide plate 56 is located between the first guide plate 55 closest to the outlet 53 and the first guide plate 55 closest to the inlet 52.

[0376] The container body 54 is mainly used to accommodate a fluid whose temperature can be adjusted.

[0377] The first guide plate 55 and the second guide plate 56 are used to guide the fluid to flow in the temperature adjustment chamber 51 .

[0378] In the embodiment of the present disclosure, since the first guide plate 55 is connected to the cavity wall of the cooling cavity toward the target end, the first guide plate 55 is spaced apart from the cavity wall of the cooling cavity away from the target end, and the second guide plate 56 is spaced apart from the cavity wall of the cooling cavity toward the target end, the second guide plate 56 is connected to the cavity wall of the cooling cavity away from the target end, and the second guide plate 56 is located between the first guide plate 55 closest to the outlet 53 and the first guide plate 55 closest to the inlet 52, so that the first guide plate 55 and the second guide plate 56 are distributed in a staggered state in the accommodating space 11. The fluid entering the temperature control cavity 51 from the inlet 52 flows through a longer path under the guidance of the first guide plate 55 and the second guide plate 56 and then flows out from the outlet 53, which is conducive to sufficient temperature control of the fluid in the temperature control cavity 51.

[0379] It is understandable that the first guide plate 55 and the second guide plate 56 may not be provided in the temperature adjustment chamber 51 depending on the situation.

[0380] In one embodiment, the ignition point of the flame retardant cover 904 and the ignition point of the package structure 1 are both greater than or equal to 800°C.

[0381] For example, the ignition point of the flame retardant cover 904 may be 800° C., 810° C., 860° C., or 900° C., etc.

[0382] For example, the ignition point of the flame retardant cover 904 can be measured by heating the flame retardant cover 904 to a state where the flame retardant cover just burns.

[0383] For example, the ignition point of the package structure 1 can be measured by heating the package structure 1 to a state where the package structure just burns.

[0384] In the embodiment of the present disclosure, the ignition points of the flame retardant cover 904 and the package structure 1 are relatively high. Even under the influence of thermal runaway gas at a relatively high temperature, the flame retardant cover 904 and the package structure 1 will not be substantially ignited.

[0385] In one embodiment, referring to Figures 14 to 16 and Figure 22 , the package structure 1 includes a housing 10 and a top cover 21 . A pressure relief vent 12 is formed on one side of the housing 10 . The top cover 21 and the housing 10 enclose a receiving space 11 , and the conductive terminal 2 is mounted on the top cover 21 .

[0386] Exemplarily, the mica paper is bonded to the housing 10 .

[0387] In the embodiment of the present disclosure, before the top cover body 21 is installed on the shell 10, the conductive terminal 2 on the top cover body 21 can be electrically connected to the tab of the battery cell 3, and then the connected top cover body 21, conductive terminal 2 and battery cell 3 can be installed to the shell 10, so as to facilitate the connection of the conductive terminal 2 and the battery cell 3 before entering the shell.

[0388] It is understandable that the wrapping structure 1 is not limited to the structure in which the top cover body 21 is installed on the housing 10. For example, the wrapping structure 1 can be an integrally formed structure.

[0389] In one embodiment, referring to FIG. 14 to FIG. 16 and FIG. 22 , the top cover body 21 has a flange 141 covering the side wall of the housing 10 , and a gap between the flange 141 and the side wall of the housing 10 is less than or equal to 0.5 mm.

[0390] Exemplarily, the gap between the flange 141 and the side wall of the housing 10 may be 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm or 0.1 mm.

[0391] For example, before the top cover body 21 is installed into the housing 10 but before the top cover body 21 is connected to the housing 10 , the dimension between the flange 141 and the side wall of the housing 10 can be measured by a feeler gauge, a vernier caliper or a micrometer.

[0392] For example, the span of the flange 141 of the top cover body 21 and the corresponding span of the shell 10 can also be measured separately by a vernier caliper or a micrometer, and half of the difference between the two is the gap between the top cover body 21 and the shell 10.

[0393] For example, referring to FIG. 22 , the gap between the flange 141 and the side wall of the housing 10 is D1 , and D1 ≤ 0.5 mm.

[0394] In the embodiment of the present disclosure, the flange 141 is not completely sealed from the side wall of the shell 10, and the gap between the flange 141 and the side wall of the shell 10 is relatively appropriate, so that the resistance to the escape of thermal runaway gas from between the flange 141 and the side wall of the shell 10 is relatively large, which can better suppress the thermal runaway gas from erupting toward the top cover body 21, thereby better guiding the thermal runaway gas in the accommodating space 11 to erupt from the pressure relief port 12, which is beneficial to reducing the degree of thermal runaway of the battery 4.

[0395] In one embodiment, please refer to Figures 17 and 18, the shell 10 includes a plurality of bent plates 131 bent in sequence, and the bent plates 131 at both ends of the circumference of the battery cell 3 are connected, and the plurality of bent plates 131 are arranged to form a pressure relief port 12. The top cover body 21 and the pressure relief port 12 are respectively located on opposite sides of the shell 10, and the top cover body 21 and the plurality of bent plates 131 are arranged to form a receiving space 11. The wrapping structure 1 also includes an insulating layer 15, and the insulating layer 15 covers the inner surface of the shell 10.

[0396] The housing 10 includes a plurality of bent plates 131. The housing 10 is formed by bending a whole plate multiple times and then connecting the bent plates 131 at both ends. The housing 10 is in an unfolded state before being bent.

[0397] Exemplarily, the insulating layer 15 is covered on the housing 10 by hot pressing.

[0398] Exemplarily, the insulating layer 15 is applied to the housing 10 .

[0399] In the disclosed embodiment, the housing 10 is generally flat in the unfolded state. The insulating layer 15 can be first placed over the unfolded housing 10, and then the housing 10 and the insulating layer 15 can be bent together. After the housing 10 is bent and formed, the insulating layer 15 already covers the inner surface of the housing 10. Covering the insulating layer 15 over the housing 10 in the unfolded state allows the insulating layer 15 to be more conveniently installed on the housing 10.

[0400] In one embodiment, please refer to Figures 17 and 18, the shell 10 is made of metal, and the battery 4 also includes a reinforcing plate 6, which is located on the inner surface of the shell 10. The bent plates 131 at both ends of the battery cell 3 are connected by welding. The welding position of the bent plates 131 at both ends of the battery cell 3 is the target position, and the reinforcing plate 6 is welded to the shell 10 at the target position.

[0401] It should be noted that the reinforcing plate 6 is welded to the housing 10 , and the material of the reinforcing plate 6 is a material that can be welded to the housing 10 .

[0402] Exemplarily, the material of the housing 10 and the material of the reinforcing plate 6 are both metal.

[0403] In the embodiment of the present disclosure, the shell 10 and the reinforcing plate 6 are welded together by welding the reinforcing plate 6 to the shell 10 at the target position. The reinforcing plate 6 supports the shell 10 at the target position, reducing the possibility of the bent plates 131 at both ends of the shell 10 being welded through during the welding process.

[0404] In one embodiment, referring to FIG. 19 , the housing 10 is made of metal, and has a thickness of 0.1 mm to 1 mm.

[0405] Exemplarily, referring to FIG. 19 , the thickness of the housing 10 is D2 , 0.1 mm ≤ D2 ≤ 1 mm.

[0406] Illustratively, the thickness of the housing 10 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0407] In the embodiment of the present disclosure, the shell 10 is made of a metal material, and the thickness of the shell 10 is set to be relatively appropriate, so that the shell 10 is relatively light in weight while having a basically sufficient bearing capacity.

[0408] In one embodiment, referring to FIG. 19 , the housing 10 is made of plastic and is an integrally formed structure. The thickness of the housing 10 is 1 mm to 3 mm.

[0409] Exemplarily, referring to FIG. 19 , the thickness of the shell 10 is D2, 1 mm ≤ D2 ≤ 3 mm.

[0410] Exemplarily, referring to FIG. 19 , the thickness of the housing 10 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.3 mm, 2.6 mm, 2.9 mm, or 3 mm.

[0411] In the embodiment of the present disclosure, the shell 10 is made of a plastic material, and the thickness of the shell 10 is set to be relatively appropriate, so that the shell 10 is relatively light in weight while having a basically sufficient bearing capacity.

[0412] In one embodiment, referring to FIG. 14 to FIG. 16 , the material of the top cover body 21 is plastic, and the material of the housing 10 is metal or plastic.

[0413] In one embodiment, referring to FIG. 14 to FIG. 16 , the top cover body 21 is made of plastic, the shell 10 is made of metal or plastic, and the flame retardant cover 904 is made of mica.

[0414] Exemplarily, the housing 10 may be made of metal such as steel, aluminum, aluminum alloy, copper or copper alloy.

[0415] Illustratively, the aluminum alloy may be an aluminum-magnesium alloy.

[0416] For example, the material of the top cover body 21 can be engineering plastics such as polypropylene or polyethylene.

[0417] In the embodiment of the present disclosure, the top cover body 21 made of plastic material has a certain pressure bearing capacity. The shell 10 made of plastic material or metal material has a certain pressure bearing capacity.

[0418] It is understandable that the material of the flame retardant cover is not limited to mica. For example, the material of the flame retardant cover can be glass fiber.

[0419] In one embodiment, referring to FIG. 14 to FIG. 16 , the conductive terminal 2 and the pressure relief port 12 are respectively located on two opposite sides of the package structure 1 .

[0420] In the disclosed embodiment, because the conductive terminals 2 and the pressure relief vent 12 are located on opposite sides of the package structure 1, the conductive terminals 2 can be positioned as far away from the pressure relief vent 12 as possible, and the thermal runaway gas ejected from the pressure relief vent 12 and the substances carried by the thermal runaway gas can be positioned as far away from the conductive terminals 2. Accordingly, in at least two sequentially arranged batteries 4, the pressure relief vents 12 of the at least two sequentially arranged batteries 4 can be positioned as far away from the conductive terminals 2 of the at least two sequentially arranged batteries 4 as possible. This can reduce the possibility of the thermal runaway gas ejected from the pressure relief vents 12 of the at least two sequentially arranged batteries 4 being ejected toward the conductive terminals 2 of an adjacent battery 4, causing a short circuit in the adjacent battery 4, thereby minimizing the possibility of thermal runaway spreading to the adjacent battery 4.

[0421] It is understandable that the arrangement of the conductive terminals 2 and the pressure relief vents 12 is not limited. For example, the wrapping structure 1 is arranged in a direction toward the conductive terminals 2 and in a cross arrangement toward the pressure relief vents 12 .

[0422] The presently disclosed embodiment further provides a battery module, refer to FIG23 , the battery module includes at least two batteries 4 according to any of the above embodiments, the at least two batteries 4 are arranged in sequence, the conductive terminals 2 of the at least two batteries 4 arranged in sequence are oriented in the same direction, and in the at least two batteries 4 arranged in sequence, the conductive terminals 2 are oriented crosswise to the direction in which the at least two batteries 4 are arranged in sequence.

[0423] In the embodiment of the present disclosure, by locating the conductive terminal 2 and the pressure relief vent 12 on different sides of the wrapping structure 1, the conductive terminals 2 facing the same direction, and the conductive terminals 2 facing in a direction that crosses the direction in which the batteries 4 are arranged in sequence, the possibility of the thermal runaway gas ejected from the pressure relief vent short-circuiting the conductive terminal 2 of the adjacent battery 4 can be reduced, thereby reducing the possibility of the thermal runaway gas from short-circuiting the conductive terminal 2 of the adjacent battery 4, thereby reducing the possibility of the thermal runaway spreading to the adjacent battery 4.

[0424] In one embodiment, referring to Figures 14 to 22 , the battery 4 includes a top cover body 21, a soft-pack battery cell, a housing 10, and mica paper. The top cover body 21 can be used to assemble the housing 10. The housing 10 includes five bent plates 131 that are bent in sequence. The five bent plates 131 of the housing 10 block the accommodating space 11 in four directions corresponding to the accommodating space 11. The top cover body 21 is mounted on the housing 10, and the top cover body 21 blocks the accommodating space 11 in the direction from the accommodating space 11 toward the top cover body 21. In other words, the housing 10 and the top cover body 21 block the accommodating space 11 in five directions. The battery cell 3 is mounted within the housing 10, and the mica paper covers the pressure relief vent 12 of the housing 10. In the event of thermal runaway of the soft-pack battery cell within the housing 10, the generated gas and the substances carried by the gas are ejected from the mica paper at the pressure relief vent 12, thereby achieving a directional ejection of the soft-pack battery cell. The housing 10, the top cover body 21 and the accommodation space 11 sealed by the mica paper do not need to be completely sealed, as long as they can guide the directional eruption of the gas generated by thermal runaway. The mica paper is bonded to the housing 10. There is a notch 41 on the mica paper, and the notch 41 is located in the area corresponding to the pressure relief port 12 of the housing 10. The notch 41 can form a blasting point during the occurrence of thermal runaway. A through hole 42 is formed on the mica paper for the structure in the accommodation space 11 to extend out. The top cover body 21 is an injection molded part, and the conductive terminal 2 is a tab embedded in the top cover body 21. The top cover body 21 can also be embedded with other metal inserts. The top cover body 21 and the housing 10 can be connected in various forms such as bonding, hot pressing or welding. The top cover body 21 and the shell 10 do not need to be completely sealed. There can be a gap of less than or equal to 0.5mm between the top cover body 21 and the shell 10, or other structures that can suppress the eruption of thermal runaway gases from between the shell 10 and the top cover body 21 to a certain extent, so as to suppress the eruption of thermal runaway gases from between the shell 10 and the top cover body 21. Soft-pack battery cells are placed in the shell 10. Other structures besides soft-pack battery cells can also be placed in the shell 10. The number of battery cells in the shell 10 is greater than or equal to 1 and less than or equal to 4. The shell 10 is a metal shell 10 with a thickness of 0.1mm to 1mm. The interior of the shell 10 is sprayed with an insulating coating or a hot-pressed insulating layer 15.

[0425] For example, please refer to Figures 17 and 18. The shell 10 is formed by bending a plate. The shell 10 includes a plurality of bent plates 131 bent in sequence. The bent plates 131 at both ends of the circumference of the battery cell 3 are connected by welding to splice a continuous annular shell 10. The number of welds in the shell 10 is one weld. A reinforcing plate 6 can be arranged at the weld position to reduce the possibility of the corresponding bent plate 131 being welded through.

[0426] For example, the two parts of the housing 10 may be welded into the annular housing 10 through two welds at different positions.

[0427] For example, the housing 10 may be integrally formed without welding.

[0428] For example, the bent plates 131 at both ends of the housing 10 along the circumference of the battery cell 3 may be formed by bonding or other methods in addition to welding.

[0429] For example, the housing 10 may be integrally formed of high-temperature resistant plastic, and the thickness of the housing 10 may be 1 mm to 3 mm.

[0430] In some embodiments, the battery cell 3 is a soft-pack battery cell. The tabs of the soft-pack battery cell are first welded to the conductive terminals 2 on the top cover body 21. The welded soft-pack battery cell, top cover body 21, and conductive terminals are then mounted to the housing 10, so that the soft-pack battery cell is located within the housing 10.

[0431] In some embodiments, the tabs of the electrode assembly 30 are first welded to the first connector 22 and / or the second connector 23, and then the electrode assembly 30, the first connector 22 and / or the second connector 23, and the top cover body 21 are installed to the shell 10 so that the electrode assembly 30 is located inside the shell 10.

[0432] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A battery comprising: a housing defining a receiving space and having an opening on one side; a top cover assembly disposed on the housing and closing the opening, the top cover assembly comprising a top cover body, a bottom surface of the top cover body being provided with a locking step along a first direction away from the top surface of the top cover body, the top cover body cooperating with the opening edge of the housing through the locking step to close the opening of the housing; The electrode assembly is accommodated in the accommodation space.

2. The battery according to claim 1, wherein The engaging step is recessed toward the top surface of the top cover body to form a mounting groove, and the opening edge of the shell is inserted into the mounting groove.

3. The battery according to claim 2, wherein The engaging step has a guide rib located in the mounting groove, the guide rib is located on the inner side of the shell, and the guide rib has a guide surface on the side facing the side wall of the shell. The distance between the guide surface and the side wall of the shell is a preset distance, and the preset distance gradually increases along the direction from the bottom of the top cover body to the top of the top cover body.

4. The battery according to any one of claims 1 to 3, wherein The top cover itself is glued to the shell.

5. The battery according to any one of claims 1 to 4, wherein The top cover assembly further includes a first connecting member and a second connecting member capable of conducting electricity and provided on the top cover body, the first connecting member including a first connecting portion and a first exposed portion connected to the first connecting portion, the second connecting member including a second connecting portion and a second exposed portion connected to the second connecting portion, the first connecting portion and the second connecting portion each including a connecting surface extending along a first direction, the first exposed portion and the second exposed portion being exposed to the outside of the housing; The electrode assembly includes a positive electrode tab and a negative electrode tab extending along the first direction, the connection surface of the first connection portion is connected to the positive electrode tab or the negative electrode tab surface, and the connection surface of the second connection portion is connected to the positive electrode tab or the negative electrode tab surface that is not connected to the first connection portion.

6. The battery according to claim 5, wherein The first connecting member further includes a third connecting portion connected to the first connecting portion, and the third connecting portion includes a connecting surface extending along the first direction; the number of the second connecting members is an even number.

7. The battery according to claim 6, wherein The battery comprises at least two electrode assemblies. The first connecting portion of the first connecting member is connected to the positive electrode tab or the negative electrode tab of one electrode assembly, and the third connecting portion of the first connecting member is connected to the positive electrode tab or the negative electrode tab of another electrode assembly. The tabs in each of the electrode assemblies that are not connected to the first connector are respectively connected to the second connecting portion of the second connector.

8. The battery according to claim 6 or 7, wherein An insulating shielding member is provided between the second connecting portions of two adjacent second connecting members.

9. The battery according to claim 8, wherein The insulating shielding member protrudes from both ends of the second connecting member along the first direction.

10. The battery according to claim 8 or 9, wherein The battery also includes an insulating support connected to the insulating shielding member, and the insulating support is provided on both opposite sides of the insulating shielding member along the direction in which the two second connecting members are arranged. The insulating support is located on the side of the top cover body facing the electrode assembly along the first direction, and the end of the second connecting portion facing away from the second exposed portion abuts against the side of the insulating support facing the top cover body.

11. The battery according to claim 10, wherein In the second connecting portions of two adjacent second connecting members, a side of the second connecting portion of each second connecting member facing away from the corresponding other second connecting portion protrudes from the insulating support.

12. The battery according to claim 10 or 11, wherein The insulating shielding member comprises: an insulating body connected to a side of the insulating support platform facing the top cover body, the insulating body being clamped between the second connecting portions of two adjacent second connecting members; An insulating auxiliary part is connected to the side of the insulating base facing away from the top cover body, the thickness of the insulating auxiliary part along the arrangement direction of two adjacent second connecting parts is smaller than the thickness of the insulating main body along the arrangement direction of two adjacent second connecting parts, and the size of the insulating auxiliary part along the first direction is larger than the thickness of the insulating auxiliary part along the arrangement direction of two adjacent second connecting parts.

13. The battery according to claim 12, wherein The insulating shielding member also includes an insulating spacer, which is connected to the side of the insulating body facing away from the insulating base, and the insulating spacer protrudes from the side of the second exposed portion facing away from the second connecting portion along the first direction. The thickness of the insulating spacer along the arrangement direction of two adjacent second connecting members is less than the thickness of the insulating body along the arrangement direction of two adjacent second connecting members, and the size of the insulating spacer along the first direction is greater than the thickness of the insulating spacer along the arrangement direction of two adjacent second connecting members.

14. The battery according to any one of claims 5 to 13, wherein The connection surface of the first connection portion is welded to the positive electrode tab or the negative electrode tab surface, and the connection surface of the second connection portion is welded to the positive electrode tab or the negative electrode tab surface that is not connected to the first connection portion.

15. The battery according to any one of claims 1 to 14, wherein The housing has a pressure relief port, and the pressure relief port is communicated with the accommodating space.

16. The battery according to claim 15, wherein The battery further includes a pressure relief cover connected to the shell, and the pressure relief cover is disposed on the pressure relief port.

17. The battery according to claim 16, wherein The pressure relief cover is an insulating film, the melting point of the insulating film is less than or equal to 500° C., or the pressure relief cover has a weakened area for pressure relief.

18. The battery according to claim 17, wherein The wall thickness of the weakened area is smaller than the wall thickness of the remaining portion of the pressure relief cover.

19. The battery according to any one of claims 1 to 18, wherein The battery further includes a sealing bag which is sleeved on the outside of the electrode assembly, and the sealing bag is located inside the shell.

20. A battery pack comprising: Box; The battery according to any one of claims 1 to 19, located in the box.

21. An electrical device comprising the battery according to any one of claims 1 to 19 or the battery pack according to claim 20.

22. An energy storage device comprising: The battery according to any one of claims 1 to 19 or the battery pack according to claim 20, wherein the battery is capable of storing electrical energy and providing electrical energy.

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