A lead-out sheet, a battery, a battery pack, and an electrical device

Abstract

The application relates to the battery technical field, and provides a lead-out sheet, a battery, a battery pack and a power utilization equipment. The lead-out sheet is applied to the battery. The lead-out sheet comprises a lead-out part. One end surface of the lead-out part is used for welding with a tab of the battery. The lead-out part is provided with a reinforcing piece opposite to the end surface welded with the tab. One end of the reinforcing piece is connected to the lead-out part. The other end of the reinforcing piece is bent. The reinforcing piece can increase the strength of the end surface of the lead-out part opposite to the connection position, so that the bending strength of the lead-out part is increased, and the lead-out part is not prone to deformation.

Description

Technical Field

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

[0002] In recent years, with the rapid development and popularization of new energy vehicles, the application of batteries has become increasingly widespread. As the power source for automobiles and other electrical equipment, batteries play an irreplaceable role. Typically, multiple batteries are integrated with thermal management systems, battery management systems, and other structures into a single enclosure to form a battery pack, which is used to power the vehicle.

[0003] The battery in the relevant technology mainly includes a casing, terminals, and cell assembly. The cell assembly has positive and negative tabs, and the casing has positive and negative terminals. When assembling the battery, the positive and negative terminals are directly or indirectly welded to the positive and negative tabs to draw out the electrical energy of the cell assembly.

[0004] In related technologies, the pole and the tab can be connected together by a lead-out piece. However, when connecting the tab and the lead-out piece, bending deformation is likely to occur, which affects the welding quality. Utility Model Content

[0005] This application provides a lead sheet, a battery, a battery pack, and an electrical device that can increase the strength of the part of the lead sheet used to connect with the electrode tab, thereby ensuring the connection quality.

[0006] The first aspect of this application provides a lead sheet, the lead sheet including a lead portion, one end face of the lead portion being used for welding to a battery tab, a reinforcing member being provided on the lead portion facing away from the end face to which it is welded to the tab, one end of the reinforcing member being connected to the lead portion, and the other end of the reinforcing member being bent.

[0007] The lead-out piece of this application has a reinforcing member on the part of the lead-out portion facing away from the welding end face. The reinforcing member increases the strength of the end face of the lead-out portion facing away from the welding position, thereby increasing the bending strength of the lead-out portion and making it less prone to deformation. In addition, the reinforcing member of this application has a bent structure. This two-part structure of the reinforcing member can withstand the pressure of the lead-out portion, which can increase the bending resistance. Moreover, when the reinforcing member of this application is set as a bent structure, it can save more material compared with some solid structures, thereby reducing the manufacturing cost of the lead-out piece and minimizing its weight.

[0008] In one possible implementation, the reinforcing member and the lead-out portion are integrally formed.

[0009] In one possible implementation, the reinforcing member and the lead-out piece are separate components, with one end of the reinforcing member welded to the lead-out piece.

[0010] In one possible implementation, the reinforcing member includes a first reinforcing part and a second reinforcing part, the first reinforcing part and the second reinforcing part are connected, either the first reinforcing part or the second reinforcing part is used to connect to the lead-out part, and an included angle is provided between the first reinforcing part and the second reinforcing part, so that the first reinforcing part and the second reinforcing part are bent relative to each other.

[0011] In one possible implementation, the included angle between the first reinforcing part and the second reinforcing part is 60°-120°.

[0012] In one possible implementation, the first reinforcing portion and the lead-out portion are connected, and an included angle is provided between the first reinforcing portion and the lead-out portion.

[0013] In one possible implementation, the included angle between the first reinforcing portion and the lead-out portion is 60°-120°.

[0014] In one possible implementation, the reinforcement extends along the length of the lead-out portion.

[0015] In one possible implementation, the reinforcing member is provided with a first reinforcing portion connected to the lead-out portion, and at least one second reinforcing portion connected to the end of the first reinforcing portion away from the lead-out portion, the second reinforcing portion being bent along the width direction of the lead-out portion.

[0016] In one possible implementation, when a plurality of second reinforcing parts are connected to the end of the first reinforcing part away from the lead-out part, at least two of the second reinforcing parts are bent in opposite directions.

[0017] In one possible implementation, a plurality of reinforcing members are provided, the plurality of reinforcing members being spaced apart along the width direction of the lead-out portion, a first reinforcing portion of the reinforcing member being connected to the lead-out portion, a second reinforcing portion being connected to the end of the first reinforcing portion away from the lead-out portion, and the second reinforcing portion being bent along the width direction of the lead-out portion.

[0018] In one possible implementation, at least two of the second reinforcing portions of the reinforcing members are bent in opposite directions.

[0019] In one possible implementation, the lead-out piece and the reinforcing member are made of the same material.

[0020] In one possible implementation, the lead-out sheet and the reinforcing member are made of aluminum or copper.

[0021] In one possible implementation, the lead-out tab further includes a first connecting segment connected to one end of the lead-out portion along its length, bent relative to the lead-out portion in a direction opposite to the end face of the lead-out portion used for welding with the tab; and / or the lead-out tab further includes a second connecting segment connected to one end of the lead-out portion along its length, bent relative to the lead-out portion in a direction opposite to the end face of the lead-out portion used for welding with the tab.

[0022] In one possible implementation, the lead-out piece further includes a first extension connected to the end of the first connecting segment away from the lead-out portion, the first extension and the first connecting segment being at an angle; and / or the lead-out piece further includes a second extension connected to the end of the second connecting segment away from the lead-out portion, the second extension and the second connecting segment being at an angle.

[0023] In one possible implementation, along the thickness direction of the lead-out piece, the end face of the first extension segment facing away from the lead-out portion and the end face of the second extension segment facing away from the lead-out portion are flush.

[0024] In one possible implementation, along the thickness direction of the lead-out piece, the distance between the end face of the lead-out portion used for welding with the tab and the end face of the first extension or the second extension portion facing away from the lead-out portion is H, and the distance between the end face of the reinforcing member and the lead-out portion connected to the end face of the reinforcing member facing away from the lead-out portion is h, satisfying 0.2 < h / H ≤ 1.

[0025] In one possible implementation, the first extension is provided with a fastener or a connection hole, and the first extension is connected to the battery through the fastener or connection hole.

[0026] And / or the second extension is provided with a fastener or a connecting hole, and the second extension is connected to the battery through the fastener or connecting hole.

[0027] In one possible implementation, the welding area between the tab and the lead-out portion is S1, and the area of ​​the reinforcing member projected onto the welding end face of the tab and the lead-out portion is S2, where S2 / S1≥0.5.

[0028] A second aspect of this application provides a battery including a housing, a battery cell, a cover plate, and the aforementioned lead-out tabs. The battery cell is disposed within the housing and includes tabs. The cover plate is connected to the housing and is used to seal the battery cell within the housing. A portion of the lead-out tabs is fixed within the housing. The tabs pass through the cover plate and are welded to the lead-out portion.

[0029] In one possible implementation, the cover plate is provided with a lead-out hole, the lead-out portion is disposed outside the cover plate through the lead-out hole, the electrode tab passes through the lead-out hole, and the end of the electrode tab is welded to the end face of the lead-out portion facing away from the cover plate.

[0030] In one possible implementation, the cover plate further includes a cap that protrudes from the cover plate and covers the outlet hole, the cap being used to cover the outlet portion.

[0031] In one possible implementation, the cover plate is further provided with an electrode post, and the lead-out piece is welded to the electrode post through the connecting portion.

[0032] In one possible implementation, an insulating element is further included, the insulating element having a snap-fit ​​element disposed between the lead-out piece and the cover plate, the lead-out piece having a fastener or a connecting hole adapted to connect the snap-fit ​​element to connect the lead-out piece to the insulating element.

[0033] A third aspect of this application provides a battery pack including the battery described above and / or the lead sheet described above.

[0034] A fourth aspect of this application provides an electrical device, including an electrical appliance, the battery described above, or the battery pack described above, wherein the battery pack is used to provide electrical energy to the electrical appliance. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This illustration shows a schematic diagram of a lead-out sheet provided in some embodiments of this application;

[0037] Figure 2 A schematic diagram of another structure of the lead-out sheet provided according to some embodiments of this application is shown;

[0038] Figure 3 A schematic diagram of the structure of a battery provided according to some embodiments of this application is shown;

[0039] Figure 4 A partial cross-sectional view of a battery provided according to some embodiments of this application is shown;

[0040] Figure 5 A cross-sectional view is shown of the cover plate and lead-out tab connection structure provided in some embodiments of this application;

[0041] Figure 6 A schematic diagram of the cover plate and lead-out tab connection structure provided in some embodiments of this application is shown.

[0042] Figure label:

[0043] 10. Housing; 20. Cell; 21. Tab; 30. Lead-out tab; 31. Lead-out portion; 32. First connecting portion; 321. First connecting section; 322. First extension section; 3221. First connecting hole; 33. Second connecting portion; 331. Second connecting section; 332. Second extension section; 3321. Second connecting hole; 34. Reinforcing member; 341. First reinforcing member; 342. Second reinforcing member; 40. Cover plate; 41. Lead-out hole; 42. Terminal post; 43. Liquid injection hole; 44. Cap; 45. Insulating member; 451. Fastening member; 50. Accommodating space. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] This application provides a battery pack and an electrical device having the battery pack. The electrical device includes an electrical appliance, a battery, or a battery pack. The electrical device includes an electrical appliance, and the battery pack can provide electrical energy to the electrical appliance. In this application, the electrical device can be a vehicle, such as a sedan, bus, or truck. For example, the vehicle can be an electric vehicle (EV), a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, or any vehicle with a battery.

[0046] A battery pack consists of a housing and the batteries housed within it. The battery pack includes cell modules, connectors, a Battery Management System (BMS), a battery thermal management device, necessary structural supports, and protective structures. A battery module is a modular battery pack formed by connecting multiple batteries in series or parallel, along with auxiliary structural components that collect current, gather data, and secure and protect the cells. With advancements in battery technology and improvements in individual cell quality, Cell-to-Pack (CTP) technology has emerged, overcoming the bottleneck of balancing structural rigidity and reliability in battery packs. CTP directly assembles the battery pack from the individual cells, eliminating the need for battery modules. This reduces the use of non-power-supplying structural components, freeing up more space for the cells, increasing the energy density of the battery system, and ultimately improving vehicle range.

[0047] A battery mainly consists of a casing, terminals mounted on the casing, and battery cell assembly housed inside the casing. The battery cell assembly, as the main structure of the battery, primarily includes positive and negative electrode plates and an insulating film that insulates the positive and negative electrode plates. The positive and negative electrode plates can each lead out to positive and negative electrode tabs, which can be directly or indirectly welded to the positive and negative electrode terminals on the casing to facilitate the extraction of electrical energy from the battery cell.

[0048] When the tab and the terminal are indirectly connected, a lead-out piece is provided between the terminal and the tab. One end of the lead-out piece is welded to the terminal, and the end of the tab can be welded to the lead-out piece, so as to indirectly weld the tab and the terminal together.

[0049] However, because the part of the lead sheet used for welding to the tab is suspended inside the battery, its strength is relatively low. During welding of the tab and the lead sheet, the suspended part of the lead sheet is subjected to downward pressure from the welding equipment, causing a certain degree of bending deformation. Therefore, it is necessary to increase the strength of the lead sheet to avoid this problem.

[0050] This application provides a lead sheet to address the aforementioned problems. The lead sheet of this application can be used in batteries to connect the tabs and terminals. The lead sheet of this application is provided with a reinforcing member, which increases the strength of the welding part between the lead sheet and the tab, making it less prone to deformation during welding of the tab and the lead sheet.

[0051] Figure 1 This diagram illustrates a structural schematic of an lead-out sheet provided in some embodiments of this application. Figure 2 This illustration shows another structural schematic diagram of the lead-out sheet provided according to some embodiments of this application. Figure 3 The diagram shows a schematic representation of the structure of a battery provided according to some embodiments of this application. Figure 4A partial cross-sectional view of a battery provided according to some embodiments of this application is shown.

[0052] Please refer to Figures 1 to 2 As shown, this application embodiment provides a lead sheet 30, which can be applied to a battery. In some possible implementations, the lead sheet 30 provided by this application includes a lead portion 31, and the two ends of the lead portion 31 in the length direction can be connected to the battery. It should be noted here that the length direction of the lead portion 31 is the direction in which the size of the lead portion 31 is larger.

[0053] For clarity, see [link to documentation]. Figure 1 As shown, in this application, the length direction of the lead-out portion 31 is parallel to the X-axis direction, the width direction of the lead-out portion 31 is parallel to the Y-axis direction, and the height direction of the lead-out portion 31 is parallel to the Z-axis direction. For the sake of simplicity, the length direction of the lead-out portion 31 can be replaced by a first direction, the width direction by a second direction, and the thickness direction by a third direction in the following description.

[0054] When both ends of the lead-out portion 31 are connected to the battery, the lead-out portion 31 can be suspended in the battery. One end face of the lead-out portion 31 in the height direction is used to connect with the tab 21 of the battery cell 20. The connection method between the lead-out portion 31 and the tab 21 can be, but is not limited to, welding, conductive adhesive bonding, and crimping. In this application, welding of the lead-out portion 31 and the tab 21 is used as an example. A reinforcing member 34 is provided on the end face of the lead-out portion 31 facing away from the end face to which it is welded to the tab 21. One end of the reinforcing member 34 is connected to the lead-out portion 31, and the other end of the reinforcing member 34 is bent.

[0055] When welding the tab 21 to the lead-out piece 30, the welding equipment applies a certain pressure to the lead-out portion 31. Without any protective measures, the lead-out portion 31 is easily deformed by pressure, resulting in poor welding quality. In this application, the lead-out portion 31 has a reinforcing member 34 on the side facing away from the welding end. The reinforcing member 34 increases the strength of the end face of the lead-out portion 31 facing away from the welding position, thereby increasing the bending strength of the lead-out portion 31 and making it less prone to deformation. Furthermore, the end of the reinforcing member 34 away from the lead-out portion 31 is bent, giving it a two-part structure that can withstand the pressure of the lead-out portion 31, increasing bending resistance. Moreover, the bent structure of the reinforcing member 34, compared to some solid structures, saves material, reducing the manufacturing cost of the lead-out piece 30 and minimizing its weight.

[0056] There are various ways to connect the reinforcing member 34 and the lead-out portion 31. For example, the reinforcing member 34 can be formed by bending one end of the lead-out portion 31 by stamping, or the reinforcing member 34 can be connected to the lead-out portion 31 by welding.

[0057] Specifically, in some feasible ways, the reinforcing member 34 and the lead-out portion 31 are integrally formed, or one end of the lead-out portion 31 is used as the reinforcing member 34, and the reinforcing member 34 is formed by stamping. Specifically, when stamping and bending the reinforcing member 34, the reinforcing member 34 is bent along the thickness direction of the lead-out portion 31 away from the end face where the lead-out portion 31 and the electrode lug 21 are welded.

[0058] It should be noted that the first connecting part 32 and the second connecting part 33 mentioned below are respectively connected to the two ends of the lead-out part 31 in the length direction. After the reinforcing member 34 is formed, it is located between the first connecting part 32 and the second connecting part 33, so that the reinforcing member 34 is arranged adjacent to the first connecting part 32 and the second connecting part 33.

[0059] When the reinforcing member 34 is formed by stamping, gaps are provided between the end of the reinforcing member 34 in the first direction and between the first connecting part 32 and the second connecting part 33. This prevents the first connecting part 32 and the second connecting part 33 from interfering with the bending of the reinforcing member 34 when it is stamped and bent. By making the reinforcing member 34 and the lead-out part 31 as a single unit, they can be produced simultaneously during manufacturing, which improves production efficiency. Furthermore, after manufacturing, the reinforcing member 34 is already located on the lead-out part 31, and only needs to be bent and formed by stamping. This method is simple and has high forming efficiency.

[0060] In other possible implementations, the reinforcing member 34 can also be provided independently of the lead-out portion 31, with one end of the reinforcing member 34 connected to the lead-out portion 31 by welding. In this case, the end of the reinforcing member 34 along the first direction is in contact with the first connecting portion 32 and the second connecting portion 33, and the end of the reinforcing member 34 is welded to the lead-out portion 31.

[0061] By welding the reinforcing member 34 and the lead-out portion 31, the connection position between the reinforcing member 34 and the lead-out portion 31 is not limited to the end of the lead-out portion 31. The reinforcing member 34 can also be connected to a position near the middle of the lead-out portion 31, allowing for more flexible connection positions based on actual needs. Furthermore, when connecting the reinforcing member 34 to the lead-out portion 31 by welding, there is no need to leave a gap between the end of the reinforcing member 34 and the first connecting portion 32 and the second connecting portion 33. The end of the reinforcing member 34 can be in contact with the two connecting portions, and the two ends of the reinforcing member 34 can be welded to the first connecting portion 32 and the second connecting portion 33 respectively. This increases the strength of both the reinforcing member 34 and the lead-out portion 31.

[0062] See Figure 4As shown, in some possible implementations, the reinforcing member 34 includes a first reinforcing part 341 and a second reinforcing part 342, which are connected together. Either the first reinforcing part 341 or the second reinforcing part 342 is used to connect to the lead-out part 31. That is, the first reinforcing part 341 can be connected to the lead-out part 31, or the second reinforcing part 342 can be connected to the lead-out part 31. In this application, the first reinforcing part 341 is connected to the lead-out part 31 as an example for explanation.

[0063] An included angle is provided between the first reinforcing part 341 and the second reinforcing part 342 of this application, so that the first reinforcing part 341 and the second reinforcing part 342 are bent relative to each other, and the second reinforcing part 342 serves as the bent part of the reinforcing member 34.

[0064] The first reinforcing part 341 and the second reinforcing part 342 can be independent structures. When processing the reinforcing part 34, the first reinforcing part 341 and the second reinforcing part 342 can be welded together to form the reinforcing part 34, or the first reinforcing part 341 and the second reinforcing part 342 can be integrally formed and bent relative to each other by stamping or other means to form the reinforcing part 34.

[0065] In this embodiment, the first reinforcing member 34 and the second reinforcing member 34 are integrally formed. The bending portion between the first reinforcing member 34 and the second reinforcing member 34 can be a right angle or a rounded corner.

[0066] It is worth mentioning that the bending angle between the first reinforcing part 341 and the second reinforcing part 342 is not limited and can be greater than 0° and less than 180°. That is to say, any angle can be provided between the first reinforcing part 341 and the second reinforcing part 342. In the embodiment of this application, the included angle between the first reinforcing part 341 and the second reinforcing part 342 is 90°.

[0067] The reinforcing member 34 has a first reinforcing part 341 and a second reinforcing part 342. The first reinforcing part 341 and the second reinforcing part 342 have an included angle, so that the entire reinforcing member 34 is arranged in an L-shape. Compared with the solid reinforcing member 34 in the related art, the first reinforcing part 341 and the second reinforcing part 342 are used to strengthen the strength of the lead-out part 31. This not only increases the strength of the lead-out part 31, but also the L-shaped reinforcing member 34 formed by the first reinforcing part 341 and the second reinforcing part 342 uses less material, saves manufacturing costs, and can minimize the weight of the reinforcing member 34.

[0068] In some feasible ways, the reinforcing member 34 of this application extends along a first direction (the length direction of the lead-out portion 31) to increase the strength of the lead-out portion 31 in the length direction.

[0069] Due to the mechanical properties of materials, when a force is applied to the upper surface of a material, the stress on its upper and lower surfaces is greatest in the thickness direction. In this application, the tab 21 is welded to one end face of the lead-out portion 31 in the height (or thickness) direction. Therefore, when welding the tab 21, the stress on the end face of the lead-out portion 31 facing away from the tab 21 is greatest. Thus, to improve the effect of the reinforcing member 34, it needs to be positioned on the opposite side of the lead-out portion 31 from the welding end of the tab 21. In this embodiment, the reinforcing member 34 is located on the opposite side of the end face of the lead-out portion 31 facing away from the tab 21 and its welding end face. Furthermore, at least one reinforcing member 34 can be provided on the lead-out portion 31. Providing at least one reinforcing member 34 means that one or more reinforcing members 34 can be provided on the lead-out portion 31.

[0070] For example, in some feasible implementations, a reinforcing member 34 is provided on the lead-out portion 31. The end of the reinforcing member 34 away from the connection with the lead-out portion 31 has at least one bent portion. It should be noted that when the reinforcing member 34 of this application includes a first reinforcing portion 341 and a second reinforcing portion 342, the second reinforcing portion 342 forms the bent portion of the reinforcing member 34. As mentioned above, the included angle between the second reinforcing portion 342 and the first reinforcing portion 341 is not limited. In this application, the included angle between the second reinforcing portion 342 and the first reinforcing portion 341 is a right angle. When the first reinforcing portion 341 is provided perpendicular to the lead-out portion 31, the bent portion of the reinforcing member 34 bends toward the width direction of the lead-out portion 31.

[0071] In this application, the reinforcing member 34 may have one or more bent portions. When there is one bent portion, that is, when the reinforcing member 34 includes one second reinforcing portion 342, the second reinforcing portion 342 can be disposed on one of the two end faces of the first reinforcing portion 341 in the second direction. When there are multiple bent portions, that is, when there are multiple second reinforcing portions 342, the multiple second reinforcing portions 342 can be disposed on the same side of the first reinforcing portion 341 or on opposite sides of the first reinforcing portion 341. In general, the second reinforcing portions 342 are disposed on the end face of the first reinforcing portion 341 in the second direction. When there are multiple second reinforcing portions 342, at least two second reinforcing portions 342 can be disposed on opposite sides of the first reinforcing portion 341 along the second direction, and these two second reinforcing portions 342 form bent portions bending in opposite directions.

[0072] In other possible implementations, multiple reinforcing members 34 may be provided, with multiple reinforcing members 34 spaced apart from the lead-out portion 31. When multiple reinforcing members 34 are provided, the bending directions of the bending portions of at least two reinforcing members 34 are opposite.

[0073] Specifically, this application uses the example of providing two reinforcing members 34 for explanation. The second reinforcing portion 342 of the reinforcing member 34 forms the bent portion of the reinforcing member 34. The second reinforcing portions 342 of the two reinforcing members 34 can be arranged opposite to each other or back to back. When the two second reinforcing portions 342 are arranged opposite to each other, they are respectively connected to the opposite end faces of the two first reinforcing portions 341. When the two second reinforcing portions 342 are arranged back to back, they are respectively connected to the opposite end faces of the two first reinforcing portions 341.

[0074] Of course, the two second reinforcing parts 342 can also be bent in the same direction relative to the first reinforcing part 341.

[0075] When the tab 21 is welded to the lead-out portion 31, the tab 21 is welded to the opposite edge position of the lead-out portion 31. Therefore, the stress at the edge position of the lead-out portion 31 in the width direction is greater, while the stress at the middle position of the lead-out portion 31 in the width direction is smaller. Therefore, in order to more effectively improve the load-bearing capacity of the lead-out portion 31, a reinforcing member 34 is provided at the end of the lead-out portion 31 in the width direction to increase the load-bearing strength of the edge of the lead-out portion 31.

[0076] It is worth mentioning that the lead-out piece 30 and the reinforcing member 34 are made of the same material; for example, both the lead-out piece 30 and the reinforcing member 34 can be made of aluminum or copper. By setting the lead-out piece 30 and the reinforcing member 34 to be of the same material, not only is processing easier, but the connection between the two can also be facilitated. In addition, the battery cell 20 has a positive electrode tab 21 and a negative electrode tab 21. The lead-out piece 30 used to connect to the positive electrode tab 21 is made of aluminum, and the lead-out piece 30 used to connect to the negative electrode is made of copper.

[0077] In this embodiment of the application, the lead-out piece 30 further includes a first connecting portion 32 and a second connecting portion 33, the first connecting portion 32 and the second connecting portion 33 being respectively connected to the two ends of the lead-out portion 31 in the length direction.

[0078] The first connecting portion 32 of this application further includes a first extension 322 and a first connecting portion 321, with the first extension 322 connected to the first connecting portion 321. The second connecting portion 33 includes a second extension 332 and a second connecting portion 331, with the second extension 332 connected to the second connecting portion 331.

[0079] The first extension segment 322 and the first connecting segment 321 are provided with an included angle, and the second extension segment 332 and the second connecting segment 331 are provided with an included angle. The end of the first connecting segment 321 away from the first extension segment 322 and the end of the second connecting segment 331 away from the second extension segment 332 are both used to connect to the lead-out portion 31. The first connecting segment 321 and the second connecting segment 331 respectively form the bent sections of the first connecting portion 32 and the second connecting portion 33.

[0080] It should be noted that the included angle between the first connecting segment 321 and the first extension segment 322 is not limited, nor is the included angle between the second connecting segment 331 and the second extension segment 332. In order to ensure that the two ends of the lead-out part 31 are connected in a consistent manner, the included angle between the first connecting segment 321 and the first extension segment 322 is equal to the included angle between the second connecting segment 332 and the second extension segment 332.

[0081] In this application, the included angle between the first connecting segment 321 and the first extension segment 322, and the included angle between the second connecting segment 331 and the second extension segment 332, can both be 60°-120°. For example, the included angle between the first connecting segment 321 and the first extension segment 322 can be 60°, 90°, or 120°. The included angle between the second connecting segment 331 and the second extension segment 332 can both be 60°, 90°, or 120°.

[0082] Furthermore, when the first connecting segment 321 and the second connecting segment 331 are connected to the lead-out portion 31, an included angle is provided between the first connecting segment 321, the second connecting segment 331, and the lead-out portion 31. In this application, the included angle between the first connecting segment 321 and the lead-out portion 31, and the included angle between the second connecting segment 331 and the lead-out portion 31, can be 60°-120°. For example, the included angle between the first connecting segment 321 and the lead-out portion 31 can be 60°, 90°, or 120°, and the included angle between the second connecting segment 331 and the lead-out portion 31 can be 60°, 90°, or 120°.

[0083] It should be noted that the spacing between the first connecting part 32, the second connecting part 33, and the lead-out part 31 is equal. In this embodiment, the first connecting part 32, the second connecting part 33, and the lead-out part 31 are all plate-shaped structures, and the first connecting part 32, the second connecting part 33, and the lead-out part 31 are flat plate structures with uniform thickness.

[0084] To ensure connection consistency, the first connecting portion 32 and the second connecting portion 33 in this application have the same thickness, or the end face of the first connecting portion 32 facing away from the lead-out portion 31 and the end face of the second connecting portion 33 facing away from the lead-out portion 31 are flush.

[0085] In this application, the first extension segment 322 and the second extension segment 332 are parallel to the lead-out portion 31. The height of the entire lead-out piece 30 can be the distance between the end face of the lead-out portion 31 facing away from the first extension segment 322 and the end face of the first extension segment 322 facing away from the lead-out portion 31, or the distance between the end face of the lead-out portion 31 facing away from the second extension segment 332 and the end face of the second extension segment 332 facing away from the lead-out portion 31. These two distances can be equal or unequal. When they are equal, the end faces of the first extension segment 322 and the second extension segment 332 facing away from the lead-out portion 31 are flush in the thickness direction of the lead-out portion 31. This application will use the example of the end faces of the first extension segment 322 and the second extension segment 332 being flush with the end faces of the lead-out portion 31 as an example for explanation. In this application, the reinforcing member 34 also has a certain height. The height of the reinforcing member 34 is the dimension along the third direction, that is, the dimension between the end face of the first reinforcing part 341 facing away from the second reinforcing part 342 (the end face where the first reinforcing part 341 and the lead-out part 31 are connected) and the dimension between the second reinforcing part 342 facing away from the first reinforcing part 341.

[0086] For clarity, see [link to documentation]. Figure 4 As shown, Figure 4 In this diagram, H represents the height of the lead-out piece 30, and h represents the height of the reinforcing member 34. During setup, the relationship between the height of the lead-out piece 30 and the height of the reinforcing member 34 is: 0.2 < h / H ≤ 1. The height of the reinforcing member 34 and the height of the lead-out piece 30 need to be dynamically adjusted. The height of the reinforcing member 34 changes according to the height of the lead-out piece 30. The height of the reinforcing member 34 cannot be too low; if it is too low, the reinforcing member 34 will not be effective and will not achieve the ideal strength for the lead-out part 31, making it easier for the lead-out part 31 to bend and deform. Conversely, the height of the reinforcing member 34 cannot be too high either; if it exceeds the height of the lead-out piece 30, it will affect the installation of the lead-out piece 30 inside the battery.

[0087] In some feasible implementations, the lead-out piece can be connected to the internal structure of the battery via the first connecting portion 32 and the second connecting portion 33, respectively. Specifically, a first connecting hole 3221 can be formed on the first extension 322, and a second connecting hole 3321 can be formed on the second extension 332. A latching member is provided inside the battery, and the lead-out piece is fixed to the battery by cooperating with the latching member and the first connecting hole 3221 and the second connecting hole 3321. Alternatively, fasteners can be provided on the first extension 322 and the second extension 332, and a structure that cooperates with the fasteners can be provided inside the battery. For example, the fasteners can be latching members, and holes that cooperate with the latching members are provided inside the battery. The lead-out piece is fixed to the battery by the latching member and the holes. It should be noted that the first extension 322 and the second extension 332 can be provided with the same structure for connecting to the internal structure of the battery. For example, both can be provided with connecting holes, or both can be provided with fasteners, or one of the first extension 322 and the second extension can be provided with fasteners and the other with connecting holes.

[0088] See Figure 3 and Figure 4 As shown, this application also provides a battery, which includes a casing 10, a battery cell 20, a cover plate 40, and a lead-out tab 30 mentioned above. The casing 10 serves as the external protective structure of the battery, has an internal accommodating space, and one end of the casing 10 has an opening communicating with the accommodating space. The battery cell 20 can be accommodated within the casing 10 through the opening, and the battery cell 20 includes a tab 21. The cover plate 40 is connected to the end of the casing 10 with the opening, allowing the cover plate 40 to cover the opening and seal the battery cell 20 within the casing 10. A portion of the lead-out tab 30 is fixed within the casing 10, and the tab 21 of the battery cell 20 is welded to the lead-out portion 31.

[0089] For example, the battery can be a single-cell 20 structure or a multi-cell 20 structure. When the battery is a multi-cell 20 structure, the tabs 21 of the multiple cells 20 extend from both sides of the lead-out portion 31 and are welded to the surface of the lead-out portion 31. Due to the low energy of ultrasonic welding, the lead-out piece 30 and the tab 21 are prone to poor welding, causing the tab 21 to detach from the lead-out piece 30, resulting in a reduction in battery capacity. Therefore, this application uses FTT (Friction Stir Welding, laser welding) to weld the tab 21 and the lead-out piece 30.

[0090] It should be noted that the lead-out piece 30 of this application can be disposed inside the housing 10. In this case, the electrode 21 extends from the cell 20 toward the lead-out piece 30 and is then soldered to the lead-out portion 31 of the lead-out piece 30. Alternatively, the lead-out piece 30 of this application can also be disposed outside the housing 10, or partially disposed outside the housing 10.

[0091] Combination Figure 1 As shown, the lead-out piece 30 in this application includes a lead-out portion 31 and a first connecting portion 32 and a second connecting portion 33 connected to the lead-out portion 31. The lead-out portion 31 is spaced apart from the first connecting portion 32 and the second connecting portion 33, and the lead-out portion 31 is located between the first connecting portion 32 and the second connecting portion 33, so that the middle position (lead-out portion 31) of the lead-out piece 30 protrudes. In this application, the lead-out portion 31 extends out of the housing 10. Correspondingly, the tab 21 also extends out of the housing 10 and is welded to the lead-out portion 31, so that the tab 21 and the lead-out portion 31 are welded on the outside of the housing 10, thereby reducing the space occupied by the tab 21 and the lead-out portion 31 inside the housing 10, which is beneficial to increasing the space inside the housing 10 and thus increasing the energy density of the battery.

[0092] In some feasible embodiments, to facilitate the smooth extension of the tab 21 and the lead-out portion 31 beyond the housing 10, a lead-out hole 41 is also provided on the cover plate 40. The lead-out hole 41 penetrates the cover plate 40 and connects to the interior of the housing 10. The lead-out portion 31 can be positioned outside the cover plate 40 through the lead-out hole 41, and the connector 35 passes through the lead-out hole 41. The tab 21 passes through the lead-out hole 41 and extends beyond the housing 10. The end of the tab 21 is welded to the end face of the lead-out portion 31 facing away from the cover plate 40.

[0093] It should be noted that a receiving space 50 is formed between the lead-out part 31 and the cover plate 40, and the reinforcing member 34 is located in the receiving space 50, so that the setting of the reinforcing member 34 will not occupy the internal space of the housing 10, and can also prevent the reinforcing member 34 and the battery cell 20 from interfering.

[0094] Figure 5 A cross-sectional view is shown of the connection structure between the cover plate 40 and the lead-out piece 30 according to some embodiments of this application. Figure 6 A schematic diagram of the connection structure between the cover plate 40 and the lead-out piece 30 provided in some embodiments of this application is shown.

[0095] See Figure 2 and Figure 6As shown, in some feasible embodiments, the welding end faces of the tab 21 and the lead-out portion 31, and the connecting end face of the reinforcing member 34 and the lead-out portion 31 are located on the two end faces in the thickness direction of the lead-out portion 31, and these two end faces are arranged in parallel, which can effectively increase the strength of the lead-out portion 31. When the tab 21 and the lead-out portion 31 are welded, the welding area between the tab 21 and the lead-out portion 31 can be set as S1. When the reinforcing member 34 is connected to the lead-out portion 31, the area of ​​the orthographic projection of the reinforcing member 34 on the connecting end face of the lead-out portion 31 (which can also be regarded as the area of ​​the orthographic projection of the reinforcing member 34 on the welding surface of the tab 21 and the lead-out portion 31) is S2, and the relationship between the two is S2 / S1≥0.5. When the projected area of ​​the reinforcing member 34 on the lead-out portion 31 is at least equal to half of the welding area of ​​the tab 21, the reinforcing effect of the reinforcing member 34 is relatively ideal.

[0096] In some feasible implementations, the tab 21 and the lead-out portion 31 extend outside the housing 10 through the lead-out hole 41. To protect the tab 21 and the lead-out portion 31 from damage, a cap 44 is also provided on the cover plate 40. The edge of the cap 44 can be welded to the cover plate 40. The middle part of the cap 44 is a raised structure. The cap 44 covers the lead-out hole 41 and can close the lead-out hole 41. The raised structure in the middle of the cap 44 is hollow inside and has an opening facing the lead-out hole 41. In this way, the lead-out portion 31 and the tab 21 located outside the housing 10 can be covered inside the cap 44, which can protect the tab 21 and the lead-out portion 31.

[0097] In some feasible implementations, the cover plate 40 is also provided with an electrode post 42 and an injection hole 43. The injection hole 43 communicates with the interior of the housing 10, allowing electrolyte to be supplied into the housing 10. The electrode post 42 protrudes from the end of the cover plate 40 facing away from the housing 10. The lead-out piece 30 of this application is welded to the electrode post 42 via a connecting portion. Specifically, the first connecting portion 32 of this application is used to connect with the electrode post 42. The first connecting portion 32 has a first connecting hole 3221, and the first connecting portion 32 is laser-welded to the electrode post 42 through the first connecting hole 3221.

[0098] See Figure 4 and Figure 5 As shown, in some feasible embodiments, an insulating member 45 is also provided inside the housing 10. The insulating member 45 is located between the lead-out piece and the cover plate 40. The insulating member 45 can be connected to the cover plate 40 by adhesive. The insulating member 45 is made of insulating materials such as plastic or rubber. The first connecting part 32 and the second connecting part 33 of this application can be connected to the insulating member 45. The insulating member 45 serves to separate the first connecting part 32, the second connecting part 33, and the cover plate 40, thereby insulating the lead-out piece 30 and the cover plate 40.

[0099] Specifically, the first connecting part 32 is provided with a first connecting hole 3221, and the first connecting part 32 is welded to the pole post 42 through the first connecting hole 3221. The second connecting part 33 is provided with a second connecting hole 3321, and the insulating member 45 is provided with a fastening member 451, which can be engaged with the second connecting hole 3321 to connect the second connecting part 33 to the insulating member 45.

[0100] By providing an insulating element 45, short circuits between the lead-out piece 30 and the cover plate 40 can be prevented. A second connecting hole 3321 is provided on the second connecting part 33. The second connecting hole 3321 can be connected to the snap-fit ​​element 451 on the insulating element 45, thereby connecting the second connecting part 33 to the insulating element 45. In this way, the first connecting part 32 and the second connecting part 33 of the lead-out piece 30 are respectively connected to the insulating element 45 and the pole post 42, so that the lead-out part 31 can be suspended.

[0101] It should be noted that, in order to increase the connection strength of the first connecting part 32 and to prevent the first connecting part 32 from detaching from the pole post 42, a second connecting hole 3321 can be provided on the first connecting part 32. A fastening member 451 is provided on the insulating member 45 at the position corresponding to the second connecting hole 3321 on the first connecting part 32. The first connecting part 32 and the insulating member 45 are connected by the cooperation of the fastening member 451 and the second connecting hole 3321. In this way, the first connecting part 32 is connected to both the insulating member 45 and the pole post 42. The connection between the first connecting part 32 and the insulating member 45 can increase its connection strength with the pole post 42.

[0102] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model 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 utility model.

[0103] In the description of this utility model, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0104] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lead-out piece, characterized in that, The lead-out piece includes a lead-out portion (31), one end face of which is used to connect with the battery tab (21). A reinforcing member (34) is provided on the end face of the lead-out portion (31) opposite to the end face of which it is welded to the tab (21). One end of the reinforcing member (34) is connected to the lead-out portion (31), and the other end of the reinforcing member (34) is bent.

2. The lead-out sheet according to claim 1, characterized in that, The reinforcing member (34) and the lead-out part (31) are integrally formed.

3. The lead-out sheet according to claim 1, characterized in that, The reinforcing member (34) and the lead-out piece are separately provided, and one end of the reinforcing member (34) is welded to the lead-out part (31).

4. The lead-out sheet according to claim 1, characterized in that, The reinforcing member (34) includes a first reinforcing part (341) and a second reinforcing part (342). The first reinforcing part (341) and the second reinforcing part (342) are connected. Either the first reinforcing part (341) and the second reinforcing part (342) is used to connect to the lead-out part (31). An included angle is provided between the first reinforcing part (341) and the second reinforcing part (342) so that the first reinforcing part (341) and the second reinforcing part (342) are bent relative to each other.

5. The lead-out sheet according to claim 4, characterized in that, The included angle between the first reinforcing part (341) and the second reinforcing part (342) is 60°-120°.

6. The lead-out sheet according to claim 4, characterized in that, The first reinforcing part (341) is connected to the lead-out part (31), and an included angle is provided between the first reinforcing part (341) and the lead-out part (31).

7. The lead-out sheet according to claim 6, characterized in that, The included angle between the first reinforcing part (341) and the lead-out part (31) is 60°-120°.

8. The lead-out sheet according to claim 4, characterized in that, The reinforcing member (34) extends along the length direction of the lead-out portion (31).

9. The lead-out sheet according to claim 8, characterized in that, The reinforcing member (34) is provided in one part. The first reinforcing part (341) of the reinforcing member (34) is connected to the lead-out part (31). At least one second reinforcing part (342) is connected to the end of the first reinforcing part (341) away from the lead-out part (31). The second reinforcing part (342) is bent along the width direction of the lead-out part (31).

10. The lead-out sheet according to claim 9, characterized in that, When a plurality of second reinforcing parts (342) are connected to one end of the first reinforcing part (341) away from the lead-out part (31), at least two of the second reinforcing parts (342) bend in opposite directions.

11. The lead-out sheet according to claim 8, characterized in that, Multiple reinforcing members (34) are provided, and the multiple reinforcing members (34) are spaced apart along the width direction of the lead-out portion (31). The first reinforcing part (341) of the reinforcing member (34) is connected to the lead-out portion (31), and the second reinforcing part (342) is connected to the end of the first reinforcing part (341) away from the lead-out portion (31). The second reinforcing part (342) is bent along the width direction of the lead-out portion (31).

12. The lead-out sheet according to claim 11, characterized in that, The second reinforcing portions (342) of at least two of the reinforcing members (34) are bent in opposite directions.

13. The lead-out sheet according to claim 1, characterized in that, The lead-out piece and the reinforcing member (34) are made of the same material.

14. The lead-out sheet according to claim 13, characterized in that, The lead-out sheet and the reinforcing member (34) are made of aluminum or copper.

15. The lead-out sheet according to any one of claims 1-14, characterized in that, The lead-out tab also includes a first connecting segment (321), which is connected to one end of the lead-out portion (31) along its length direction. The first connecting segment (321) is bent relative to the lead-out portion (31) in a direction opposite to the end face of the lead-out portion (31) used for welding to the tab (21); and / or The lead-out piece also includes a second connecting segment (331), which is connected to one end of the lead-out portion (31) in the length direction and is bent relative to the lead-out portion (31) in the direction opposite to the end face of the lead-out portion (31) for welding with the tab (21).

16. The lead-out sheet according to claim 15, characterized in that, The lead-out piece further includes a first extension (322), which is connected to the end of the first connecting segment (321) away from the lead-out portion (31), and the first extension (322) and the first connecting segment (321) are provided with an included angle; and / or The lead-out piece also includes a second extension (332), which is connected to the end of the second connecting section (331) away from the lead-out portion (31), and the second extension (332) and the second connecting section (331) are provided with an included angle.

17. The lead-out sheet according to claim 16, characterized in that, Along the thickness direction of the lead-out piece, the end face of the first extension segment (322) facing away from the lead-out portion (31) and the end face of the second extension segment (332) facing away from the lead-out portion (31) are flush.

18. The lead-out sheet according to claim 17, characterized in that, Along the thickness direction of the lead-out piece, the distance between the end face of the lead-out portion (31) used to connect with the tab (21) and the end face of the first extension section (322) or the second extension section (332) facing away from the lead-out portion (31) is H, and the distance between the end face of the reinforcing member (34) connected with the lead-out portion (31) and the end face of the reinforcing member (34) facing away from the lead-out portion (31) is h, satisfying 0.2<h / H≤1.

19. The lead-out sheet according to claim 17, characterized in that, The first extension section (322) is provided with a fastener or a connecting hole, and the first extension section (322) is connected to the battery through the fastener or connecting hole; And / or the second extension (332) is provided with a fastener or a connection hole, the second extension (332) being connected to the battery through the fastener or connection hole.

20. The lead-out sheet according to any one of claims 1-14, characterized in that, The welding area between the electrode tab (21) and the lead-out portion (31) is S1, and the area of ​​the reinforcing member (34) on the orthographic projection of the welding end face of the electrode tab (21) and the lead-out portion (31) is S2, where S2 / S1≥0.

5.

21. A battery, characterized in that, include: Shell (10); A battery cell (20) is disposed within the housing (10), and the battery cell (20) includes a tab (21); A cover plate (40), connected to the housing (10), the cover plate (40) being used to enclose the battery cell (20) within the housing (10); and As described in any one of claims 1-20, a portion of the lead-out piece is fixed within the housing (10), the tab (21) passes through the cover plate (40), and the tab (21) is welded to the lead-out portion (31).

22. The battery according to claim 21, characterized in that, The cover plate (40) is provided with an outlet hole (41), and the outlet part (31) is disposed outside the cover plate (40) through the outlet hole (41). The electrode (21) passes through the outlet hole (41), and the end of the electrode (21) is welded to the end face of the outlet part (31) facing away from the cover plate (40).

23. The battery according to claim 22, characterized in that, The cover plate (40) also includes a cap (44), which protrudes from the cover plate (40) and covers the outlet hole (41). The cap (44) is used to cover the outlet part (31) inside.

24. The battery according to claim 21, characterized in that, The cover plate (40) is also provided with a pole post (42), and the lead-out piece is welded to the pole post (42).

25. The battery according to claim 24, characterized in that, It also includes an insulating element (45) on which a snap fastener (451) is provided. The insulating element (45) is located between the lead-out piece and the cover plate (40). The lead-out piece is provided with a fastener or a connecting hole. The connecting hole or fastener is adapted to connect the snap fastener (451) to connect the lead-out piece to the insulating element (45).

26. A battery pack, characterized in that, Includes the battery according to any one of claims 20-25, and / or the lead sheet according to any one of claims 1-20.

27. An electrical appliance, characterized in that, Includes an electrical device, a battery according to any one of claims 20-25, or a battery pack according to claim 26, the battery pack being used to provide electrical power to the electrical device.

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