Battery and electric device

Abstract

This application provides a battery and an electrical device, relating to the field of battery technology. The battery includes a casing, a top cover, an electrode assembly, and a current collector assembly. The casing has an opening on one side. The top cover is disposed on the opening side of the casing and includes a top cover body and electrode terminals insulated from and connected to the top cover body. The electrode assembly is housed within the casing and has a first tab and a second tab with opposite polarities on the same side along a first direction. The current collector assembly includes a first current collector and a second current collector, wherein the first current collector and the second current collector are insulated from and connected. The first current collector electrically connects the first tab and the electrode terminals, and the second current collector electrically connects the second tab to both the casing and the top cover body. The battery of this application increases the electrical connection path connecting the second tab, the second current collector, the casing, and the top cover, increasing the current flow area and improving the battery's charge and discharge capability at high rates.

Description

Technical Field

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

[0002] As the penetration rate of new energy vehicles in the automotive industry increases, batteries that are safe, reliable, and offer long-lasting range while reducing user charging anxiety are gaining increasing favor among researchers. Cylindrical batteries, which combine high energy density and safety, are one such option. For cylindrical batteries, existing technologies primarily employ two different tab structures: same-side and opposite-side. The same-side tab technology, compared to the opposite-side tab technology, integrates the tabs, current collector, and top cover through integrated assembly and welding, shortening the current flow path, reducing internal structural resistance, and improving rate charge / discharge performance.

[0003] However, existing cylindrical batteries, due to the integration of the cell's electrical connection pathways onto the top cover on the same side, are prone to localized overheating of the cell. Furthermore, the complexity of the same-side tab structure limits the potential for increasing the welding area between structures, i.e., the current-carrying area, which hinders further improvements in the cell's high-current charge and discharge capabilities. Therefore, providing a method to further increase the current-carrying capacity of cells with the same-side tab structure is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a battery and an electrical device to solve the technical problem that the limited overcurrent area of ​​the battery cell with the same-side tab structure in the prior art leads to high local temperature of the battery cell and difficulty in improving the high current charging and discharging capability.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a battery, including a housing, a top cover, an electrode assembly, and a current collector assembly. The housing has an opening on one side. The top cover is disposed on the opening side of the housing and includes a top cover body and electrode terminals that are insulated from and connected to the top cover body. The electrode assembly is housed within the housing and has a first tab and a second tab with opposite polarities on the same side along a first direction. The current collector assembly includes a first current collector and a second current collector, wherein the first current collector and the second current collector are insulated from and connected. The first current collector electrically connects the first tab and the electrode terminals, and the second current collector electrically connects the second tab to both the housing and the top cover body.

[0007] In one or more embodiments of this application, the first current collector includes a first base portion, a first connecting portion, and a second connecting portion, wherein the first base portion is at least partially connected to the first connecting portion and the second connecting portion, at least a portion of the first connecting portion abuts against the surface of the first electrode tab and is electrically connected to the first electrode tab, the projection of the second connecting portion in a first direction covers at least a portion of the electrode terminal, and the second connecting portion is electrically connected to the electrode terminal.

[0008] In one or more embodiments of this application, the first connecting portion protrudes toward the first electrode tab relative to the first base portion, and the first connecting portion covers the first electrode tab; the first base portion is disposed around the first connecting portion and connected to the second connecting portion.

[0009] In one or more embodiments of this application, the second current collector includes a second base portion, a third connecting portion, a fourth connecting portion, and a fifth connecting portion, wherein the second base portion is connected to the third connecting portion, the fourth connecting portion, and the fifth connecting portion, at least a portion of the third connecting portion abuts against the surface of the second electrode tab and is electrically connected to the second electrode tab, the fourth connecting portion is electrically connected to the housing, and the fifth connecting portion is electrically connected to the top cover body.

[0010] In one or more embodiments of this application, the third connecting portion protrudes toward the second electrode tab relative to the second base portion, the third connecting portion covers the second electrode tab, a portion of the second base portion is disposed around the third connecting portion, and the fifth connecting portion is connected to the second base portion.

[0011] In one or more embodiments of this application, a portion of the second base portion is circumferentially disposed around the inner wall of the housing, and the fourth connecting portion extends circumferentially around the inner wall of the housing and is connected to the second base portion.

[0012] In one or more embodiments of this application, the current collector assembly further includes a first insulating member, the second base portion has an opening, the first current collector is disposed in the opening, and is insulatedly connected to the second current collector through the first insulating member.

[0013] In one or more embodiments of this application, the first insulating member has a first groove in at least a portion of its area connected to the first current collector, at least a portion of the first base portion is disposed within the first groove, the first base portion has a first fixing hole, the first insulating member has a first protrusion that mates with the first fixing hole, and the first protrusion of the first insulating member is fixed to the first fixing hole; and / or,

[0014] The first insulating member has a second groove in at least a portion of its area connected to the second current collector. At least a portion of the second base portion is disposed in the second groove. The second base portion has a second fixing hole. The first insulating member has a second protrusion that mates with the second fixing hole. The second protrusion of the first insulating member is fixed to the second fixing hole.

[0015] In one or more embodiments of this application, the length of the fourth connecting portion extending circumferentially around the inner wall of the housing is less than the length of the second base portion circumferentially surrounding the inner wall of the housing. A notch is provided between the circumferential direction of the second base portion and the circumferential direction of the fourth connecting portion, and the fifth connecting portion is connected to the second base portion through the notch.

[0016] In one or more embodiments of this application, the fifth connecting portion includes: a bending portion and an electrical connecting portion. The bending portion is disposed at the notch and connected to the second base portion. The electrical connecting portion is connected to the bending portion and electrically connected to the end face of the top cover body facing the electrode assembly. The bending portion is bent toward the central axis direction of the current collector assembly.

[0017] Secondly, this application provides an electrical device including the battery described in the first aspect.

[0018] Based on the above technical solution, the battery and power-consuming device of this application have at least the following beneficial technical effects:

[0019] The battery of this application includes a casing, a top cover, an electrode assembly, and a current collector assembly. The electrode assembly has a first tab and a second tab with opposite polarities, located on the same side of the electrode assembly. The top cover includes a top cover body and electrode terminals insulated from and connected to the top cover body. A first current collector of the current collector assembly electrically connects the first tab and the electrode terminals to form an electrical connection path connecting the first tab, the first current collector, and the electrode terminals, with the same polarity as the first tab. A second current collector of the current collector assembly electrically connects the second tab to both the casing and the top cover body, forming an electrical connection path connecting the second tab, the second current collector, the casing, and the top cover, with the same polarity as the first tab. The battery of this application has an additional electrical connection path with the same polarity as the second tab, and another electrical connection path with the same polarity as the second tab connecting the second tab, the second current collector, and the top cover. This increases the current-carrying area and improves the battery's charge and discharge capacity at high rates. At the same time, since this electrical connection path connecting the second tab, the second current collector, the casing, and the top cover is away from the heat concentration area of ​​the top cover, it can avoid the problem of local temperature in the battery during operation and improve the overall service life of the battery. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a longitudinal cross-sectional view of the battery of this application.

[0022] Figure 2 This is a partially enlarged cross-sectional view of the battery in this application.

[0023] Figure 3 This is a schematic diagram of the current collection component of this application.

[0024] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the current collector component of this application.

[0025] Figure 5 This is a schematic diagram of the structure of the first current collector in the current collector assembly of this application.

[0026] Figure 6 This is a schematic diagram of the structure of the second current collector in the current collector assembly of this application.

[0027] Figure 7 This is a three-dimensional structural schematic diagram of the second current collector in the current collector assembly of this application from another perspective.

[0028] Figure 8 This is a schematic diagram of the welding effect between the current collector and the electrode assembly of this application.

[0029] In the figure: 1-Top cover; 2-Electrode assembly; 3-Housing; 4-Current collector assembly; 11-Top cover body; 12-Electrode terminal; 21-Second electrode tab; 22-First electrode tab; 41-Second current collector; 42-First current collector; 43-First insulating component; 130-Second insulating component; 131-First insulating part; 132-Second insulating part; 411-Fifth connecting part; 412-Third connecting part; 413-Second base part; 414-Fourth connecting part; 415-Opening; 416-Second fixing hole; 417-Notch; 421-Second connecting part; 422-First connecting part; 423-First base part; 424-First fixing hole; 431-First groove; 432-Second groove; 4111-Bending part; 4112-Electrical connection part; 4131-First part; 4132-Second part. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In cylindrical batteries of relevant technologies, there are mainly two different tab structures: same-side and opposite-side. The same-side tab design, compared to the opposite-side tab design, places the positive and negative tabs on the same side, which shortens the current path, reduces the internal resistance of the cell structure, and improves charge and discharge performance. However, because the electrical connection path of the cell is integrated on the top cover on the same side, it is prone to localized overheating of the cell. At the same time, the complexity of the same-side tab design limits the potential for increasing the welding area between structures, i.e., the current-carrying area, which is detrimental to further improving the high-current charge and discharge capability of the cell.

[0035] Based on the above considerations, in order to solve the technical problem that the limited overcurrent area of ​​the battery cell with the same-side tab structure leads to high local temperature of the battery cell and makes it difficult to improve the high-current charging and discharging capability, this application provides a battery and an electrical device.

[0036] The electrical devices disclosed in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators and lifting equipment, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc.

[0037] This application describes an electrical device using a vehicle as an example. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery to supply power to the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle. The battery can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0038] The battery described in this application can be referred to as a battery cell. Multiple batteries can be installed on supporting structures such as housings, frames, and brackets. The batteries can be electrically connected to each other, and to the battery management system, via electrical connectors, which can be busbars. Alternatively, the batteries can be electrically connected by inserting their respective terminals. For example, between two adjacent batteries, one battery has a slot on its terminal, and the other battery has a corresponding insert on its terminal. The insert is inserted into the slot to achieve electrical connection. Therefore, for one battery, the aforementioned electrical connector can be the terminal of another battery. Similarly, the batteries and the battery management system can also be electrically connected by mutual insertion, which will not be elaborated further here.

[0039] The battery described above can be a rechargeable battery or a primary battery, and can also be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. Specifically, in the embodiments of this application, the battery can be a cylindrical lithium-ion battery.

[0040] It should be noted that the first direction X can be the axial direction of the electrode assembly 2 or the axial direction of the battery.

[0041] As one example of a battery in this application, please refer to Figure 1 and Figure 2The device includes a housing 3, a top cover 1, an electrode assembly 2, and a current collector 4. The housing 3 has an opening on one side and a closed structure on the other. The housing 3 can be cylindrical and has an internal cavity for housing the electrode assembly 2, electrolyte, current collector 4, and other functional components. The top cover 1 is positioned over the opening of the housing 3 to close it, thus isolating the interior of the housing 3 from the exterior. The top cover 1 includes a top cover body 11 and electrode terminals 12 insulated from and connected to the top cover body 11. The connection between the top cover body 11 and the housing 3 can be welded. The electrode terminals 12, also called terminals, are structural components that can lead in or out current. Because the electrode terminals 12 and the top cover body 11 have different polarities, they are insulated from each other to avoid short circuits. The electrode assembly 2 in this application can be cylindrical. Electrode assembly 2, also referred to as a battery cell or a wound core, is, in a specific embodiment of this application, formed by winding a positive electrode sheet, a negative electrode sheet, and a separator film disposed between the positive and negative electrode sheets. Electrode assembly 2 is housed within housing 3, and has a first tab 22 and a second tab 21 of opposite polarity on the same side along the first direction X. Current collector assembly 4 includes a first current collector 42 and a second current collector 41, wherein the first current collector 42 and the second current collector 41 are insulated from each other. The current collector assembly 4 of this application integrates the first current collector 42 and the second current collector 41 into a single structure. The first current collector 42 electrically connects the first tab 22 and the electrode terminal 12, and the second current collector 41 electrically connects the second tab 21 to both housing 3 and top cover body 11. It is understood that the electrode terminal 12 serves as an electrode output terminal with the same polarity as the first tab 22. Housing 3 and top cover body 11 simultaneously serve as electrode output terminals with the same polarity as the second tab 21.

[0042] In the technical solution of this application embodiment, the first tab 22 and the electrode terminal 12 are electrically connected by the first current collector 42 of the current collector assembly 4 to form an electrical connection path in which the first tab 22, the first current collector 42 and the electrode terminal 12 are connected and have the same polarity as the first tab 22; the second tab 21 is electrically connected to the housing 3 and the top cover body 11 by the second current collector 41 of the current collector assembly 4 to form another electrical connection path in which the second tab 21, the second current collector 41, the housing 3 and the top cover 11 are connected and have the same polarity as the second tab 21, and the second tab 21 and the second current collector 41 are connected. Another electrical connection path, which connects the current collector 41 and the top cover 1 and has the same polarity as the second tab 21, is provided. This adds an additional electrical connection path to the battery of this application, connecting the second tab 21, the second current collector 41, the casing 3, and the top cover 1. The current flow area is increased, improving the battery's charge and discharge capacity at high rates. At the same time, since this electrical connection path connecting the second tab 21, the second current collector 41, the casing 3, and the top cover 1 is away from the heat concentration area of ​​the top cover, it can avoid the problem of local temperature in the battery during operation and improve the overall service life of the battery.

[0043] In some embodiments, the first tab 22 can be a positive tab, therefore the electrode terminal 12 connected to the first tab 22 can be a positive electrode terminal, serving as a positive output terminal. The first current collector 42 serves as a positive current collector, and its material can be aluminum for better welding connection with the first tab 22. The second tab 21 can be a negative tab, therefore both the housing 3 and the top cover 1 can be negative output terminals. The second current collector 41 serves as a negative current collector, and its material can be copper for better welding connection with the second tab 21. Of course, in some other embodiments, the first tab 22 can also be a negative tab, and the second tab 21 can also be a positive tab, as long as the polarities of the first tab 22 and the second tab 21 are opposite.

[0044] Therefore, the polarities of electrode terminal 12 and top cover body 11 are opposite. In order to achieve an insulated connection between electrode terminal 12 and top cover body 11, such as... Figure 2 As shown, in some embodiments, a second insulating member 130 is provided between the electrode terminal 12 and the top cover body 11, the second insulating member 130 insulating the electrode terminal 12 and the top cover body 11. A through hole for mounting the electrode terminal 12 is provided on the top cover body 11. Part of the second insulating member 130 is located on the surface of the top cover body 11 facing away from the electrode assembly 2, part of the second insulating member 130 is located between the through hole wall and the electrode terminal 12, and part of the second insulating member 130 is located on the surface of the top cover body 11 facing the electrode assembly 2. The second insulating member 130 can be an insulating plastic part, and its material can be PP material.

[0045] For details, please refer to Figure 2The second insulating member 130 includes a first insulating portion 131 and a second insulating portion 132. Along the first direction X, the first insulating portion 131 is connected to the top cover body 11 corresponding to the first current collector 42, and the first insulating portion 131 at least covers the first current collector 42 in its projection area along the first direction X inside the battery, so as to insulate the first current collector 42 with opposite polarity from the top cover body 11. Along the first direction X, the second insulating portion 132 is connected to the top cover body 11 corresponding to the second current collector 41, to insulate the second current collector 41 from the electrode terminal 12. The first insulating portion 131 and the second insulating portion 132 can be an integral structure.

[0046] Since the polarities of the currents flowing through the first current collector 42 and the second current collector 41 are different, in order to achieve an insulated connection between the first current collector 42 and the second current collector 41, please refer to... Figure 3 The current collector assembly 4 also includes a first insulating member 43, which is insulated from the second current collector 41. The first insulating member 43 may be an insulating plastic part, and its material may be PP. The current collector assembly 4 of this application is integrally formed from the first current collector 42, the second current collector 41 and the first insulating member 43.

[0047] Please refer to Figure 3 In some embodiments, the first current collector 42 and the second current collector 41 are distributed on both sides of the current collector assembly 4, and the first current collector 42 is embedded in the second current collector 41. The first insulating member 43 fills the gap between the first current collector 42 and the second current collector 41, thereby providing insulation for the first current collector 42 and the second current collector 41.

[0048] For details, please refer to Figure 5 The first current collector 42 includes a first base portion 423, a first connecting portion 422, and a second connecting portion 421. The first base portion 423 at least partially connects the first connecting portion 422 and the second connecting portion 421, and serves to connect the first connecting portion 422 and the second connecting portion 421 into a single unit. At least a portion of the first connecting portion 422 abuts against the surface of the first electrode tab 22 and is electrically connected to the first electrode tab 22. The projection of the second connecting portion 421 in the first direction X covers at least a portion of the electrode terminal 12, so that the second connecting portion 421 is electrically connected to the electrode terminal 12. This establishes a current path between the first electrode tab 22, the first current collector 42, and the electrode terminal 12.

[0049] In some embodiments, since the second connecting portion 421 is connected to the electrode terminal 12, the second connecting portion 421 can be located at the center of the current collector assembly 4. This is because the electrode terminal 12 is usually located at the center of the top cover 1. Of course, this is not a limitation; the second connecting portion 421 may not be located at the center of the current collector assembly 4, as long as the second connecting portion 421 and the electrode terminal 12 can be welded together and the welding area requirement is met. The second connecting portion 421 may be circular, and in some other embodiments, the second connecting portion 421 may also be of other shapes.

[0050] To prevent a short circuit caused by contact between the top cover body 11 with different polarities and the second connecting portion 421, the projection of the second connecting portion 421 in the first direction X can fall within the projection range of the electrode terminal 12. For example, when the second connecting portion 421 is circular, its diameter can be smaller than the diameter of the electrode terminal 12. In some embodiments, the diameter of the second connecting portion 421 can be 5 to 8 mm, for example, 5 to 7 mm, 6 to 8 mm, etc. Specifically, the diameter of the second connecting portion 421 is 5 mm, 6 mm, 7 mm, or 8 mm, or any value between any two of the above. The thickness of the second connecting portion 421 can be 0.3 to 0.7 mm, for example, 0.3 to 0.6 mm, 0.3 to 0.5 mm, 0.3 to 0.4 mm, 0.4 to 0.5 mm, 0.4 to 0.6 mm, or 0.4 to 0.7 mm. Specifically, the thickness of the second connecting part 421 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm or 0.7mm or any value between any two of the above.

[0051] In some embodiments, such as Figure 4 As shown, since the first connecting portion 422 is used to connect with the first electrode tab 22, the first connecting portion 422 protrudes towards the first electrode tab 22 relative to the first base portion 423, that is, the first connecting portion 422 is recessed downward relative to the first base portion 423. The first connecting portion 422 covers the first electrode tab 22. This facilitates the welding connection between the first connecting portion 422 and the first electrode tab 22, increasing the welding area. It can be understood that the first connecting portion 422 is a recess formed by pressing the first base portion 423 downward. Along the first direction X, the connection surface between the first connecting portion 422 and the first electrode tab 22 is located below the surface of the second connecting portion 421 facing the electrode assembly 2. This avoids the problem of incomplete welding caused by flatness during the welding process between the first connecting portion 422 and the first electrode tab 22.

[0052] The first base portion 423 is disposed around the first connecting portion 422 and connected to the second connecting portion 421. The first connecting portion 422 may be fan-shaped, therefore, the first base portion 423 may also be fan-shaped, consistent with the shape of the first connecting portion 422. The central angle of the fan ring of the first connecting portion 422 and the central angle of the fan ring of the first base portion 423 may be the same, and the central angle may be 100° to 140°, for example, 100°, 110°, 120°, 130°, 140°, or any value between any two of the above. The inner diameter of the fan ring of the first base portion 423 may be consistent with the radius of the second connecting portion 421, and the outer diameter of the fan ring of the first base portion 423 may be 4 / 5 of the radius of the entire current collection assembly 4. It can be understood that the inner diameter of the fan ring of the first base portion 423 refers to the radius of the side of the first base portion 423 closest to the central axis of the battery, and the outer diameter of the fan ring of the first base portion 423 refers to the radius of the side of the first base portion 423 furthest from the central axis of the battery.

[0053] To achieve the connection between the first insulator 43 and the first current collector 42, such as Figure 4 As shown, the first insulating member 43 has a first groove 431 in at least a portion of its area connected to the first current collector 42, and at least a portion of the first base portion 423 is disposed within the first groove 431. It can be understood that the edge of the first base portion 423 is embedded within the first groove 431 of the first insulating member 43 to achieve the connection between the first insulating member 43 and the first current collector 42. Further details can be found in [reference needed]. Figure 5 The first base portion 423 is provided with a first fixing hole 424. Multiple first fixing holes 424 can be provided at intervals on the first base portion 423. The first insulating member 43 is provided with a first protrusion that cooperates with the first fixing hole 424. The first protrusion of the first insulating member 43 is fixed to the first fixing hole 424, thereby further strengthening the fixed connection between the first insulating member 43 and the first current collector 42.

[0054] Please refer to Figure 6In some embodiments, the second current collector 41 includes a second base portion 413, a third connecting portion 412, a fourth connecting portion 414, and a fifth connecting portion 411. The second base portion 413 connects the third connecting portion 412, the fourth connecting portion 414, and the fifth connecting portion 411, serving to connect the third connecting portion 412, the fourth connecting portion 414, and the fifth connecting portion 411 into a single unit, thereby providing structural stability. At least a portion of the third connecting portion 412 abuts against the surface of the second tab 21 and is electrically connected to the second tab 21. The fourth connecting portion 414 is electrically connected to the housing 3, and the fifth connecting portion 411 is electrically connected to the top cover body 11. This allows the second tab 21 and the second current collector 41 to be electrically connected to both the housing 3 and the top cover body 11 simultaneously, forming two parallel current paths: the second tab 21, the second current collector 41, the housing 3, and the top cover body 11; and the second tab 21, the second current collector 41, and the top cover body 11.

[0055] For details, please refer to Figure 6 The second base portion 413 has an opening 415, which can be understood as a hollow structure extending through the thickness direction of the second base portion 413. A first current collector 42 is disposed within the opening 415, and a first insulating member 43 is also located within the opening 415, filling the gap between the first current collector 42 and the second current collector 41. Specifically, as... Figure 4 As shown, the first insulating member 43 has a second groove 432 in at least a portion of its area connected to the second current collector 41. At least a portion of the second base portion 413 is disposed within the second groove 432. It can be understood that the edge of the second base portion 413 is embedded within the second groove 432 of the first insulating member 43 to achieve the connection between the first insulating member 43 and the second current collector 41. Further details can be found in the following diagram. Figure 6 The second base portion 413 is provided with a second fixing hole 416. Multiple second fixing holes 416 can be provided at intervals on the second base portion 413. The first insulating member 43 is provided with a second protrusion that mates with the second fixing hole 416. The second protrusion of the first insulating member 43 is fixed into the second fixing hole 416. This further strengthens the fixed connection between the first insulating member 43 and the second current collector 41.

[0056] Reference Figure 4 Since the third connecting portion 412 is used to connect with the second electrode tab 21, the third connecting portion 412 protrudes towards the second electrode tab 21 relative to the second base portion 413; that is, the third connecting portion 412 is recessed downward relative to the second base portion 413. The third connecting portion 412 covers the second electrode tab 21 so that the third connecting portion 412 can be welded to the second electrode tab 21, increasing the welding area. It can be understood that the third connecting portion 412 is a recess formed by pressing the second base portion 413 downward.

[0057] like Figure 6As shown, a portion of the second base portion 413 is disposed around the third connecting portion 412. The third connecting portion 412 can be fan-shaped; therefore, the portion of the second base portion 413 surrounding the third connecting portion 412 also has a fan-shaped structure. The central angle of this fan-shaped structure is 100° to 140°, for example, it can be 100°, 110°, 120°, 130°, 140°, or any value between any two of the above. In some embodiments, the height of the third connecting portion 412 protruding from the second base portion 413 is consistent with the height of the first connecting portion 422 of the first current collector 42 protruding from the first base portion 423. This arrangement can ensure the welding effect between the first current collector 42 and the first electrode tab 22, and between the second current collector 41 and the second electrode tab 21. Figure 8 As shown. In some embodiments, the first connecting portion 422 and the third connecting portion 412 are located on both sides of the second connecting portion 421.

[0058] Please refer to Figure 6 Since the fourth connecting portion 414 is connected to the housing 3, a portion of the second base portion 413 is circumferentially arranged around the inner wall of the housing 3, and the fourth connecting portion 414 extends circumferentially around the inner wall of the housing 3 and connects to the second base portion 413. It can be understood that the fourth connecting portion 414 can be annular. Therefore, as... Figure 7As shown, the second base portion 413 includes a first portion 4131 surrounding the third connecting portion 412 and a second portion 4132 circumferentially surrounding the inner wall of the housing 3. The second portion 4132 and the first portion 4131 are connected to form a structure that surrounds the inner wall of the housing 3. In some embodiments, the plane containing the second portion 4132 has a certain angle with the inner wall of the housing 3. This angle can be 90° to 120°, for example, 90°, 100°, 110°, 120°, or any value between any two of the above. The fourth connecting part 414 can be understood as a flanged structure of the second base part 413. The fourth connecting part 414 is attached to and welded to the inner wall of the housing 3. Therefore, the included angle between the fourth connecting part 414 and the second base part 413 can be 90-120°. If the included angle is less than 90 degrees, the fourth connecting part 414 cannot fit tightly to the inner wall of the housing 3; if the included angle is too large, the accommodating diameter of the current collector 4 will be reduced, thus affecting the welding area of ​​each connecting part. All of the fourth connecting parts 414 can be used for welding to the housing 3. Specifically, during the assembly process, the fourth connecting part 414 fits tightly to the housing 3, and the welding area of ​​the fourth connecting part 414 to the housing 3 is much larger than the welding area on the fifth connecting part 411 used to connect the top cover body 11. This can effectively improve the conductivity of the battery. In addition, the fourth connecting part 414 can surround the electrode assembly 2, and the heat dissipation capacity is further improved compared to the fifth connecting part 411 used to connect the top cover body 11. All of these are beneficial to the battery's high-rate charging and discharging. Meanwhile, by welding the fourth connection part 414 of the current collector 4 to the housing 3, the internal electrode assembly can also be fixed to a certain extent, thereby improving the vibration reliability of the battery.

[0059] Please refer to Figure 6 The fourth connecting portion 414 extends circumferentially around the inner wall of the housing 3 for a shorter length than the second base portion 413 extends circumferentially around the inner wall of the housing 3. A notch 417 is provided between the circumferential direction of the second base portion 413 and the circumferential direction of the fourth connecting portion 414. That is, the fourth connecting portion 414 is not provided at the notch 417, the purpose of which is to provide clearance for the fifth connecting portion 411, which is connected to the second base portion 413 through the notch 417. One end of the fifth connecting portion 411 is connected to the second base portion 413. In some embodiments, the central angle of the notch 417 is 50 to 90°, for example, it can be 50°, 60°, 70°, 80°, 90°, or any value between any two of the above.

[0060] For details, please refer to Figure 2 and Figure 6Since the fifth connecting part 411 is used to connect with the top cover body 11, the fifth connecting part 411 includes a bending part 4111 and an electrical connecting part 4112. The bending part 4111 is located at the notch 417 and connected to the second base part 413; the electrical connecting part 4112 is connected to the bending part 4111 and electrically connected to the end face of the top cover body 11 facing the electrode assembly 2. The bending part 4111 is bent towards the central axis of the current collector assembly 4. It can be understood that the bending part 4111 can bend the electrical connecting part 4112 180° towards the central axis of the current collector assembly 4 so that the electrical connecting part 4112 can fit against the end face of the top cover body 11 facing the electrode assembly 2. In the specific assembly process, after the fifth connecting part 411 is welded to the end face of the top cover body 11 facing the electrode assembly 2, it can be folded 180° towards the central axis of the current collector assembly 4 so that the top cover 1 and the housing 3 are sealed together. The schematic diagram after folding is shown below. Figure 2 As shown.

[0061] In some embodiments, the electrical connection portion 4112 is fan-shaped to achieve an optimal weight and weldable area ratio. In some embodiments, the radius of the fan-shaped portion 4112 is no greater than 2 / 3 of the radius of the current collector assembly 4. While this limits the welding area between the current collector assembly 4 and the top cover 1, it also avoids problems such as bending of the current collector assembly 4 and insulation failure caused by the overlap between the folded fifth connection portion 411 and the second insulating portion 132 of the second insulator 130. Simultaneously, it avoids the sealing welding area between the housing 3 and the top cover 1, improving the manufacturing feasibility and yield of the battery.

[0062] After the battery of this application is connected to the positive and negative terminals externally, the positive current (or negative current) can flow through the first current collector 42-electrode terminal 12, and the negative current (or positive current) can flow through the second current collector 41-top cover body 11, or through the second current collector 41-casing 3-top cover body 11. The parallel flow path of the negative current can further reduce the resistance of the electron flow process, thereby reducing the overall ohmic impedance of the battery and effectively increasing the battery's rate charge and discharge capability. At the same time, the current during the charge and discharge process is no longer concentrated in the top cover 1, and the heat dissipation area of ​​the casing 3 through which the current flows is larger, which can also effectively improve the battery's heat dissipation capacity, reduce the heat concentration pressure on the top cover during the battery charge and discharge process, and improve the battery's service life.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: The housing (3) has an opening on one side; A top cover (1) is provided on the opening side of the housing (3). The top cover (1) includes a top cover body (11) and an electrode terminal (12) that is insulated from the top cover body (11). Electrode assembly (2) is housed in the housing (3), and the electrode assembly (2) has a first tab (22) and a second tab (21) with opposite polarities on the same side along the first direction (X); The current collector assembly (4) includes a first current collector (42) and a second current collector (41), wherein the first current collector (42) and the second current collector (41) are insulated from each other, the first current collector (42) electrically connects the first tab (22) and the electrode terminal (12), and the second current collector (41) electrically connects the second tab (21) to both the housing (3) and the top cover body (11).

2. The battery according to claim 1, characterized in that, The first current collector (42) includes a first base portion (423), a first connecting portion (422), and a second connecting portion (421). The first base portion (423) is at least partially connected to the first connecting portion (422) and the second connecting portion (421). At least a portion of the first connecting portion (422) abuts against the surface of the first electrode tab (22) and is electrically connected to the first electrode tab (22). The projection of the second connecting portion (421) in the first direction (X) covers at least a portion of the electrode terminal (12), and the second connecting portion (421) is electrically connected to the electrode terminal (12).

3. The battery according to claim 2, characterized in that, The first connecting portion (422) protrudes toward the first electrode tab (22) relative to the first base portion (423), and the first connecting portion (422) covers the first electrode tab (22); the first base portion (423) is disposed around the first connecting portion (422) and connected to the second connecting portion (421).

4. The battery according to claim 2 or 3, characterized in that, The second current collector (41) includes a second base portion (413), a third connecting portion (412), a fourth connecting portion (414), and a fifth connecting portion (411). The second base portion (413) connects the third connecting portion (412), the fourth connecting portion (414), and the fifth connecting portion (411). At least a portion of the third connecting portion (412) abuts against the surface of the second electrode (21) and is electrically connected to the second electrode (21). The fourth connecting portion (414) is electrically connected to the housing (3), and the fifth connecting portion (411) is electrically connected to the top cover body (11).

5. The battery according to claim 4, characterized in that, The third connecting portion (412) protrudes toward the second electrode tab (21) relative to the second base portion (413), the third connecting portion (412) covers the second electrode tab (21), a portion of the second base portion (413) is disposed around the third connecting portion (412), and the fifth connecting portion (411) is connected to the second base portion (413).

6. The battery according to claim 5, characterized in that, A portion of the second base portion (413) is circumferentially disposed around the inner wall of the housing (3), and the fourth connecting portion (414) extends circumferentially around the inner wall of the housing (3) and is connected to the second base portion (413).

7. The battery according to claim 4, characterized in that, The current collection assembly (4) further includes a first insulating member (43), the second base portion (413) is provided with an opening (415), the first current collection member (42) is disposed in the opening (415), and is insulatedly connected to the second current collection member (41) through the first insulating member (43).

8. The battery according to claim 7, characterized in that, The first insulating member (43) has a first groove (431) in at least a portion of its area connected to the first current collector (42). At least a portion of the first base portion (423) is disposed within the first groove (431). The first base portion (423) has a first fixing hole (424). The first insulating member (43) has a first protrusion that mates with the first fixing hole (424). The first protrusion of the first insulating member (43) is fixed to the first fixing hole (424); and / or, The first insulating member (43) has a second groove (432) in at least a portion of the area connected to the second current collector (41). At least a portion of the second base portion (413) is disposed in the second groove (432). The second base portion (413) has a second fixing hole (416). The first insulating member (43) has a second protrusion that mates with the second fixing hole (416). The second protrusion of the first insulating member (43) is fixed to the second fixing hole (416).

9. The battery according to claim 6, characterized in that, The fourth connecting part (414) extends circumferentially around the inner wall of the housing (3) for a length less than the length of the second base part (413) circumferentially surrounding the inner wall of the housing (3). A notch (417) is provided between the circumferential direction of the second base part (413) and the circumferential direction of the fourth connecting part (414). The fifth connecting part (411) is connected to the second base part (413) through the notch (417).

10. The battery according to claim 9, characterized in that, The fifth connecting part (411) includes: A bend (4111) is provided at the notch (417) and connected to the second base portion (413); The electrical connection part (4112) is connected to the bending part (4111) and is electrically connected to the end face of the top cover body (11) facing the electrode assembly (2). The bending part (4111) is bent toward the central axis of the current collector assembly (4).

11. An electrical appliance, characterized in that, Includes the battery as described in claim 10.

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