Collection components and batteries

Abstract

The present application relates to a collection component and battery, comprising a collection terminal and a main collection circuit. The collection terminal comprises a metal foil and an insulating film, wherein the metal foil is divided into a welding foil, a connecting foil, and a collection foil along the extension direction of the collection terminal. The main collection circuit comprises multiple welding areas spaced apart at intervals, and the welding foil is welded to one of the multiple welding areas spaced apart along the extension direction of the collection terminal on the collection main circuit. The insulating film comprises a connecting film and connecting ribs, wherein the connecting film covers the connecting foil, and recessed notches are provided on opposite sides of the connecting film. Each notch is provided with n connecting ribs, each connecting rib connected to the inner wall of the notch at both ends in the extension direction of the collection terminal. All connecting ribs are sequentially spaced apart along the width of the collection terminal and separate the notch into n hollow areas, where n ≥ 2. A weak area is provided on at least the outermost connecting rib of a notch. The present application can effectively prevent the collection terminal from breaking or falling off under tension, thereby ensuring the welding reliability of the collection terminal.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a collection component and a battery. Background Art

[0002] Batteries are composed of multiple cells connected in series and parallel. A battery's data acquisition component collects the operating signals of each cell. Specifically, the data acquisition component includes a main data acquisition circuit and a data acquisition terminal. The data acquisition terminal is connected to the cell to collect the cell's operating signals, and the main data acquisition circuit transmits the signals collected by the data acquisition terminal to the corresponding processing device. To reduce costs, the connection between the data acquisition terminal and the main data acquisition circuit is often welded. After prolonged charging and discharging, adjacent cells expand and deform, causing the main data acquisition circuit to shift relative to the cell. This strains the data acquisition terminal, making the weld between the terminal and the main data acquisition circuit susceptible to failure, such as tearing and detachment.

[0003] In related technologies, a buffer section is installed inside the collection terminal, which uses its deformation to accommodate cell expansion. During the production process, when the collection terminal is welded to the main collection circuit, the buffer section is easily deformed by slight external forces, changing the welding position, resulting in poor welding and affecting battery performance. Summary of the Invention

[0004] Based on this, it is necessary to provide a collection component and a battery to address the problem of poor welding between the collection terminal and the collection main circuit.

[0005] In a first aspect, the present application provides a collection component, including:

[0006] A collecting terminal, comprising a metal foil and an insulating film, wherein the metal foil is divided into a welding foil, a connecting foil and a collecting foil along an extending direction of the collecting terminal; and

[0007] The main collecting path includes a plurality of welding areas arranged at intervals; the welding foil is welded to one of the plurality of welding areas arranged at intervals along the extending direction of the collecting terminal of the main collecting path;

[0008] The insulating film includes a connecting film and connecting ribs, the connecting film covers the connecting foil, and notches are formed on opposite sides of the connecting film and are concavely arranged along the width direction of the collecting terminal; n connecting ribs are arranged in each notch, and both ends of each connecting rib in the extension direction of the collecting terminal are connected to the inner wall of the notch, all the connecting ribs are sequentially spaced along the width direction of the collecting terminal, and separate the notch into the n hollow areas, n ≥ 2, and a weak area is provided on at least the outermost connecting rib, and the minimum cross section of the connecting rib is located in the weak area.

[0009] In some embodiments, at least a portion of the connecting ribs extend longitudinally along the extension direction of the collecting terminal and are in the shape of straight strips.

[0010] In some embodiments, part of the connecting ribs bends and extends in the extension direction of the collecting terminal.

[0011] In some embodiments, in the same notch, the closer to the outer side of the connecting film, the larger the maximum size of the hollow area in the width direction of the collecting terminal.

[0012] In some embodiments, the weak area is provided on each connecting rib of each notch, and in the same notch, the closer to the outer side of the connecting membrane, the smaller the cross-sectional area of ​​the weak area on the connecting rib.

[0013] In some embodiments, the two notches are symmetrically arranged along a symmetry plane parallel to the extension direction of the collection terminal, and the connecting ribs and the weak areas in each notch are symmetrically arranged relative to the symmetry plane.

[0014] In some embodiments, a cutout and / or a hollow hole is formed on the connecting rib where the weak area is located, the cutout is recessed along the width direction of the collecting terminal, and the hollow hole is through-set along the thickness direction of the collecting terminal.

[0015] In some embodiments, the inner wall of the notch includes an arc-shaped wall that is recessed in an arc shape along the width direction of the collecting terminal.

[0016] In some embodiments, the inner wall of the notch further includes a transverse wall, the transverse wall being connected to one end of the arcuate wall and extending longitudinally away from the arcuate wall along the width direction of the collection terminal, the transverse wall being located at one end of the connecting film close to the collection foil;

[0017] One end of all the connecting ribs is connected to the transverse wall, and the other end is connected to the arc-shaped wall.

[0018] In some embodiments, the connecting foil includes a fuse, and in the extending direction of the collecting terminal, the fuse is located within the range of the notch.

[0019] In a second aspect, the present application provides a battery, comprising:

[0020] battery cells;

[0021] A busbar connected to the pole of the battery cell; and

[0022] In the collection assembly as described in any of the above embodiments, the collection foil is connected to the current collecting piece.

[0023] In some embodiments, opposite ends of the busbar are respectively connected to the poles of different battery cells;

[0024] The current collector is provided with a concave rib in the middle area between the two opposite ends. The concave rib is recessed along the thickness direction of the current collector. The inner wall and outer wall of the concave rib match each other in shape. The cross-sectional length of the concave rib is L0.

[0025] In each of the notches, the hollow area formed by the outermost connecting rib is a first hollow area. The maximum size of the first hollow area in the width direction of the collecting terminal is L1, and the following condition is satisfied: L1 ≥ L0 / 2.

[0026] This application has the following beneficial effects:

[0027] The above-mentioned collection assembly and battery utilize notches on both sides of the connection membrane, multiple connecting ribs within the notches, and a weak zone on at least the outermost connecting rib. When the position of the battery cell and the main collection circuit changes due to factors such as cell expansion, the connecting rib breaks at the weak zone. The hollow area formed by the broken connecting rib allows the collection terminal to deform to accommodate the position change, preventing the collection terminal from breaking or falling off. Furthermore, the multiple connecting ribs within the notch reinforce the positional stability of the connection membrane during welding of the collection terminal, preventing poor welding and compensating for the adverse effects of the notch on the connection membrane's positional stability. Furthermore, multi-level protection for the connection membrane is achieved, reducing the risk of the connection membrane being pulled apart. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 Schematic diagram of the structure of the acquisition component of some embodiments.

[0030] Figures 2 to 7 Schematic diagrams of the structures of acquisition terminals in different embodiments.

[0031] Figures 8 to 10 Schematic diagrams of the structures of weak areas in different embodiments.

[0032] Figure 11 Schematic diagram of the structure of the insulating film in some embodiments.

[0033] Figure 12 Schematic diagram of the structure of the busbar in some embodiments.

[0034] Figure 13This is a partial schematic diagram of the acquisition terminal in some embodiments.

[0035] The accompanying drawings in the specific implementation manner are as follows:

[0036] 100. Collection component; 10. Collection terminal; 11. Metal foil; 11a. Welding foil; a1. Welding position; a2. Solder hole; 11b. Connecting foil; b1. Fuse; b2. Connecting part; 11c. Collection foil; 12. Insulating film; 12d. Connecting film; d1. Notch; d11. Arc wall; d12. Horizontal wall; d2. Hollow area; d21. First hollow area; d22. Second hollow area; 12e. Connecting rib; e1. First connecting rib; e2. Second connecting rib; e3. Weak area; e31. Incision; e32. Hollow hole; 12f. Welding film; f1. Hollow window; 12g. Collection film; 20. Collection main line; 21. Connecting terminal; 200. Busbar; 201. Concave rib. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that, if any, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] Furthermore, if used, the terms "first" and "second," if present, 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 being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0043] In response to the problems pointed out in the background technology, the embodiments of the present application propose a collection component and a battery.

[0044] The battery in the embodiments of the present application includes a battery cell and a data acquisition component for collecting the operating signals of the battery cell. The battery cell can be a secondary battery or a primary battery, and can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell can be cylindrical, flat, rectangular, or in other shapes.

[0045] In one embodiment, the battery cell generally includes an end cap, a shell and an electrode assembly. The shell and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a accommodating cavity can be formed in the shell, and at least one end is open. The end cap covers the open end of the shell to close the accommodating cavity, and the electrode assembly is loaded in the accommodating cavity. The shell can be, but is not limited to, a metal shell, such as an aluminum shell, a steel shell, etc. The battery cell includes a pole, and the pole is connected to the tab of the electrode assembly. Optionally, the pole is protruding on the end cap. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet and a diaphragm separating the positive electrode sheet and the negative electrode sheet. An electrolyte can be injected into the battery cell, and the electrolyte can penetrate into the interior of the electrode assembly, providing an ion migration path for the electrode assembly to perform an electrochemical reaction and play a conductive role. The electrode assembly can be in the form of a winding type, a stacked type, etc. One or more electrode assemblies can be loaded in the battery cell.

[0046] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells mentioned above. The multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel. The acquisition component connects the battery cell and the battery management system. The acquisition component collects information such as the temperature / voltage of the battery cell and transmits it to the battery management system so that the battery management system can control and monitor the working status of each battery cell. In addition, multiple battery cells can also be formed into a battery module through the acquisition component and the module management system, and then the multiple battery modules are electrically connected in series, parallel, or a combination of series and parallel, and together with the battery management system, form a battery pack.

[0047] The following describes the acquisition components in the embodiments of the present application.

[0048] Figure 1 Schematic diagram of the structure of the acquisition component 100 in some embodiments. Figures 2 to 7 Schematic diagram of the structure of the acquisition terminal 10 in different embodiments of the present application.

[0049] Please combine Figure 1 and Figure 2The collection assembly 100 proposed in the embodiments of the present application includes a collection terminal 10 and a main collection path 20. The collection terminal 10 includes a metal foil 11 and an insulating film 12. The metal foil 11 is divided into a welding foil 11a, a connecting foil 11b, and a collection foil 11c along the extension direction of the collection terminal 10. The main collection path 20 includes multiple spaced-apart welding areas. The welding foil 11a is welded to one of the multiple spaced-apart welding areas of the main collection path 20 along the extension direction of the collection terminal 10. The insulating film 12 includes a connecting film 12d and a connecting rib 12e. The connecting film 12d covers the connecting foil 11b. The connecting film 12d has two opposing sides formed with a notch d1 that is recessed inwardly along the width of the collection terminal 10. Each notch d1 is provided with n connecting ribs 12e, and both ends of each connecting rib 12e in the extension direction of the collecting terminal 10 are connected to the inner wall of the notch d1. All connecting ribs 12e are sequentially spaced along the width direction of the collecting terminal 10, and divide the notch d1 into n hollow areas d2, where n ≥ 2, and a weak area e3 is provided on at least the outermost connecting rib 12e, and the minimum cross-section of the connecting rib 12e is located in the weak area e3.

[0050] The collection terminal 10 is formed by a metal foil 11 coated with an insulating film 12. The metal foil 11 can be copper foil, aluminum foil, silver foil, or other materials. The insulating film 12 can be PI film, PET film, or other materials. Specifically, along the extension direction of the collection terminal 10, the metal foil 11 is sequentially divided into a welding foil 11a, a connecting foil 11b, and a collection foil 11c. Both the collection foil 11c and the welding foil 11a have portions exposed by the insulating film 12. The exposed portion of the collection foil 11c is used to electrically connect directly to the battery cell pole or indirectly to the pole via the busbar 200. The exposed portion of the welding foil 11a is welded to the collection main circuit 20.

[0051] The main data collection path 20 can be a flexible printed circuit (FPC). Preferably, the main data collection path 20 is a flat flexible cable (FFC). A flat flexible cable (FFC) includes multiple, flat conductors arranged side by side. The parallel orientation of the conductors corresponds to the extension direction of the data collection terminal 10 (corresponding to the X direction in the figure). Flexible printed circuits (FPCs) are often etched to create their circuits. Compared to FPCs, flat flexible cables (FFCs) use conductors to create their circuits, resulting in lower manufacturing costs and a more environmentally friendly approach. The main data collection path 20 includes a connection terminal 21, which is connected to the battery management system or module management system for signal transmission. This connection terminal 21 is used to transmit the operating signals (including voltage information) of the battery cells collected by the data collection component 100 to the battery management system or module management system.

[0052] In actual use, the main data collection circuit 20 is welded to multiple data collection terminals 10. Each data collection terminal 10 extends along the width of the main data collection circuit 20 (i.e., the extension direction of the data collection terminals 10 is substantially aligned with the width of the main data collection circuit 20). This allows the data collection assembly 100 to simultaneously collect the operating signals of multiple battery cells. When the data collection assembly 100 is used in a battery, N battery cells are arranged side by side to form a battery cell group. The main data collection circuit 20 extends along the parallel direction of the battery cell group. Each data collection terminal 10 is directly or indirectly electrically connected to the electrode of each battery cell in the battery cell group through its data collection foil 11c.

[0053] There are various scenarios for distributing multiple welding zones spaced along the extension direction of the collection terminal 10. One scenario involves spacing the welding zones along the extension direction of the collection terminal 10 and staggering them along the extension direction of the main collection circuit 20 (corresponding to the Y direction in the figure). In this scenario, each collection terminal 10 can be welded to a different welding zone depending on its position along the extension direction of the main collection circuit 20. Another scenario involves distributing multiple welding zones side by side along the extension direction of the collection terminal 10 to form a welding group. Each collection terminal 10 corresponds to a welding group, and the welding foil 11a of the collection terminal 10 is welded to a welding zone within the welding group. Multiple welding groups can be provided on the main collection circuit 20 to weld to different collection terminals 10. It is worth noting that a protective layer (such as a protective film or coating) can be applied to the welded joints between the collection terminal 10 and the main collection circuit 20 to isolate the welded joints from air and prevent moisture corrosion and short circuits. The protective layer can also be applied to the welding zones within the welding group that are not welded to the collection terminal 10.

[0054] The portion of the insulating film 12 that covers the connecting foil 11b is the connecting film 12d, which essentially covers the entire connecting foil 11b. Connecting film 12d has notches d1 formed on both sides of the connecting film 12d in the width direction (corresponding to the Y direction) of the collecting terminal 10. Notches d1 are recessed inward along the width direction of the collecting terminal 10 (opening outward in the Y direction). Notches d1 can be square, arc-shaped, or other special shapes.

[0055] The insulating film 12 also includes connecting ribs 12e. Multiple connecting ribs 12e are disposed within each notch d1. Each connecting rib 12e is arranged in a curved, straight, or other strip-like shape, generally extending along the direction of the acquisition terminal 10. The multiple connecting ribs 12e within the same notch d1 are spaced apart across the width of the acquisition terminal 10, dividing the notch d1 into a plurality of hollow regions d2 arranged sequentially along the width of the acquisition terminal 10. The number of hollow regions d2 is equal to the number of connecting ribs 12e. Arranging the connecting ribs 12e across the width allows the entire acquisition terminal 10 to collect information within a relatively compact plane, facilitating layout within the limited space within the battery. Optionally, but not limited to, the connecting ribs 12e can be integrally connected to the connecting film 12d forming the notch d1. This reduces raw material usage, lowers manufacturing costs, and reduces the weight of the acquisition terminal 10, while also facilitating and reducing production costs.

[0056] Within each notch d1, a weak area e3 is defined on at least the outermost connecting rib 12e (i.e., the rib 12e closest to the open end of the notch d1). The cross section of the connecting rib 12e is perpendicular to its extension direction (roughly the same as the extension direction of the collection terminal 10). The smallest cross section of the connecting rib 12e is located in the weak area e3. The structural strength of the weak area e3 is weaker than that of the rest of the connecting rib 12e. When the battery cell expands or is subjected to external vibration or impact, and the force on the connecting rib 12e exceeds the design limit, stress will preferentially concentrate in the weak area e3 of the outermost connecting rib 12e, causing it to fracture first. This prevents direct stress transfer to the curved wall d11. Since the fuse b1 is located between the two curved walls d11, fracture of the fuse b1 is avoided. Even if the outermost connecting rib 12e breaks, the innermost curved wall d11 near the fuse b1 is not torn due to the presence of connecting ribs 12e (n ≥ 2) on the inner side, thus maintaining the collection function. This is much better than a sudden and complete breakage of the entire collection terminal 10 at the welded connection. It reduces the risk of separation and breakage of the collection terminal 10 at the welding foil 11a, connecting foil 11b, and collection foil 11c, thereby improving the robustness and maintainability of the entire battery.

[0057] When the collection assembly 100 is applied to a battery cell group, the expansion force of the battery cells has a large component in the width direction of the collection terminal 10. Under the action of this component, the battery cells and the collection main path 20 are easily displaced in the width direction of the collection terminal 10 (corresponding to the Y direction).

[0058] In practical application, combined with Figure 2It is understood that when the battery cell deviates rightward relative to the main collection circuit 20 in the Y direction, the connecting rib 12e within the left notch d1 is pulled, while the connecting rib 12e within the right notch d1 is squeezed. On the side experiencing tension, the weak area e3 on the outermost connecting rib 12e breaks first. The hollow area d2 formed by the broken connecting rib 12e reduces the restriction of the insulating film 12 on the collection terminal 10 during its displacement. The collection terminal 10 can deform to adapt to the relative position change between the battery cell and the main collection circuit 20, and the welded connection of the collection terminal 10 will not break or fall off. Each hollow area d2 on the side experiencing squeeze can absorb some external force and allow the collection terminal 10 to deform toward that side, reducing the resistance of the insulating film 12 to the deformation of the collection terminal 10 and further reducing the possibility of mechanical damage and other failures of the collection terminal 10.

[0059] Moreover, heat is generated during the operation of the battery cell, especially at the pole and busbar 200 of the battery cell, where the temperature is significantly higher than that at other locations. The collection terminal 10 is arranged at the pole and busbar 200, and the hollow area d2 helps to dissipate heat, improve the local heat dissipation environment of the collection terminal 10, and reduce the operating temperature of the collection terminal 10, so that it can operate within a relatively stable temperature range.

[0060] Furthermore, multiple connecting ribs 12e are disposed within notch d1. Firstly, these ribs 12e provide multiple positioning functions for connecting membrane 12d, thereby enhancing the positional stability of connecting membrane 12d during welding. This compensates for the adverse effects of notch d1 on the positional stability of connecting membrane 12d and effectively prevents micro-deformation of connecting membrane 12d during welding of acquisition terminal 10, thereby ensuring welding quality. Secondly, due to their different placement, the outer connecting ribs 12e are subject to greater tensile forces, making them more susceptible to breaking than the inner connecting ribs 12e. When the outer connecting ribs 12e are pulled and broken, the inner connecting ribs 12e can still resist the pull, effectively preventing the connecting membrane 12d from being broken, thus providing multi-level protection for the connecting membrane 12d.

[0061] The above-mentioned collection assembly 100 has notches d1 disposed on either side of the connection membrane 12d, and multiple connecting ribs 12e disposed within the notches d1, with a weak area e3 provided on at least the outermost connecting ribs 12e. When the position of the battery cell and the main collection circuit 20 changes due to factors such as cell expansion, the connecting ribs 12e can break at the weak area e3. The hollow area d2 formed by the broken connecting ribs 12e allows the collection terminal 10 to deform to accommodate the position change, preventing the collection terminal 10 from breaking or falling off. Furthermore, the provision of multiple connecting ribs 12e within the notches d1 strengthens the positional stability of the connection membrane 12d during welding of the collection terminal 10, preventing welding defects and compensating for the adverse effects of the notches d1 on the positional stability of the connection membrane 12d. Furthermore, it provides multi-level protection for the connection membrane 12d, reducing the risk of the connection membrane 12d being torn.

[0062] It can be understood that the maximum width of the connecting rib 12e in the Y direction is smaller than the minimum width of the connecting membrane 12d located between the two notches d1, so that the connecting rib 12e breaks first due to its weak tensile strength, thereby protecting the connecting membrane 12d.

[0063] In some embodiments, as Figures 2 to 6 As shown, at least a portion of the connecting ribs 12e extend longitudinally along the extension direction of the collection terminal 10 in a straight strip shape. Specifically, all or part of the connecting ribs 12e can extend in the X-direction in a straight strip shape. In this case, the straight connecting ribs 12e are more conducive to ensuring the positional stability of the connecting membrane 12d, and are simpler and easier to manufacture, with high processing efficiency, thereby reducing the processing cost of the collection terminal 10.

[0064] In some embodiments, as Figure 7 As shown, part of the connecting rib 12e bends and extends in the extension direction of the collecting terminal 10. Figure 7 In the illustrated embodiment, two connecting ribs 12e are disposed within each notch d1 of the collection terminal 10. The outer connecting rib 12e bends and extends along the X-direction, while the inner connecting rib 12e is straight along the X-direction. The bent and extended connecting rib 12e has a strong deformability and is not easily broken by pulling.

[0065] Specifically, the curved and extended connecting ribs 12e are arranged outside the notch d1. When the battery cell expands or is impacted by external forces, the outer connecting ribs 12e are subject to greater tensile forces. In this case, the outer connecting ribs 12e are configured to be curved and extended. The curved and extended connecting ribs 12e allow the buffer area to deform to a certain extent along its length. Their strong deformation capacity allows them to deform under greater tensile forces without being easily broken, thereby absorbing the stress caused by thermal expansion differences or impacts, and preventing stress accumulation that may lead to connection failure.

[0066] When some connecting ribs 12e are curved, the remaining connecting ribs 12e should be straight to ensure that the connecting ribs 12e as a whole position and secure the connecting membrane 12d, ensuring the positional stability of the connecting membrane 12d during the welding process. When all connecting ribs 12e are straight, the positional stability of the connecting membrane 12d during the welding process is optimal.

[0067] In some embodiments, in the same notch d1 , the closer to the outside of the connecting film 12 d , the larger the maximum size of the hollow area d2 in the width direction of the collecting terminal 10 .

[0068] The maximum dimension of the hollow area d2 in the width direction of the collection terminal 10 is its width. Figure 13 Here, L1 and L2 refer to the width of the first hollow area d21 and the width of the second hollow area d22, respectively. In this case, in the Y direction, the closer to the outside of the connecting film 12d, the wider the hollow area d2 becomes. In other words, the width of the outer hollow area d2 is greater than the width of the inner hollow area d2.

[0069] Combine Figure 2 It is understood that when the collection terminal 10 is pulled and deflected leftward in the Y direction, the connecting rib 12e located in the notch d1 on the right side is pulled, and the outer connecting rib 12e experiences greater tension than the inner connecting rib 12e. The width of the outer hollow area d2 is designed to be larger. When the outer connecting rib 12e breaks, the wider the hollow area d2 formed by the broken connecting rib 12e, the larger the deformation space it provides. This increases the deformation capacity of the collection terminal 10, the greater the degree of displacement it can accommodate, and the greater the ability of the collection terminal 10 to resist fracture and detachment of the welded connection. Furthermore, this effectively protects the inner connecting rib 12e, making it less likely to break and improving the strength of the insulating film 12.

[0070] In some embodiments, a weak area e3 is provided on each connecting rib 12e of each notch d1, and in the same notch d1, the closer to the outside of the connecting membrane 12d, the smaller the cross-sectional area of ​​the weak area e3 on the connecting rib 12e.

[0071] The smaller the cross-sectional area of ​​the weak zone e3, the lower the ultimate bearing capacity, and the easier it is to break. In each notch d1, the cross-sectional area of ​​the weak zone e3 on the outer connecting rib 12e is smaller than the cross-sectional area of ​​the weak zone e3 on the inner connecting rib 12e. The outer connecting rib 12e is more likely to break than the inner connecting rib 12e.

[0072] In practical applications, two connecting ribs 12e are provided within each notch d1 as an example. When the pulling force on the collection terminal 10 reaches a first pulling force, the outermost connecting rib 12e breaks. As the pulling force increases, when the pulling force on the collection terminal 10 reaches a second pulling force, the innermost connecting rib 12e breaks. As the pulling force continues to increase, when the pulling force on the collection terminal 10 reaches a third pulling force, the connecting membrane 12d breaks. When the pulling force is greater than the first pulling force but less than the second pulling force, the innermost connecting rib 12e is not damaged. When the pulling force is greater than the second pulling force but less than the third pulling force, the connecting membrane 12d is not damaged. In this case, the multiple connecting ribs 12e are broken one by one from the outside to the inside as the pulling force increases, achieving multi-level protection for the connecting membrane 12d.

[0073] There are various ways to arrange the weak area e3 on the connecting rib 12e. For example, the weak area e3 can be arranged on all connecting ribs 12e within each notch d1, or only on the outer portion of the connecting rib 12e. The weak area e3 can be located at the end of the connecting rib 12e near the collection foil 11c, the end of the connecting rib 12e near the welding foil 11a, or even in the middle of the connecting rib 12e. Of course, the number of connecting ribs 12e within each notch d1, as well as the location and number of the weak areas e3, can be the same or different, as long as the connecting rib 12e can be ensured to break smoothly when the collection terminal 10 reaches its ultimate tensile strength.

[0074] In a preferred embodiment, the two notches d1 are symmetrically arranged along a symmetry plane parallel to the extension direction of the collection terminal 10, and the connecting ribs 12e and the weak areas e3 in each notch d1 are symmetrically arranged relative to the symmetry plane.

[0075] The entire collection terminal 10 is arranged roughly symmetrically along this plane of symmetry. When the notch d1, connecting rib 12e, and weak zone e3 are symmetrically arranged along the same plane of symmetry, the stress concentration areas and resulting fracture effects on the collection terminal 10 remain consistent, regardless of whether the collection terminal 10 is offset to the left or right, thereby better ensuring product consistency. Furthermore, from a design and production perspective, the symmetrical design of the structure reduces verification difficulty and improves processing efficiency.

[0076] Figures 8 to 10 Schematic diagrams of the structures of the weak area e3 in different embodiments.

[0077] In some embodiments, reference Figures 8 to 10 The connecting rib 12e where the weak area e3 is located is formed with a notch e31 and / or a hollow hole e32. The notch e31 is recessed along the width direction of the collection terminal 10, and the hollow hole e32 is through-set along the thickness direction of the collection terminal 10.

[0078] The thickness direction (corresponding to the Z direction in the figure) of the collection terminal 10 is approximately perpendicular to its extension direction and width direction. The collection terminal 10 is generally thin, with its smallest dimension in the thickness direction. The cutout e31 is provided on one or both sides of the weak area e3 in the width direction and can be triangular, arc-shaped, rectangular, or other shapes. The hollow hole e32 can be circular, square, straight, zigzag (e.g., S-shaped), or other shapes. When the hollow hole e32 is a strip-shaped hole, it extends roughly from one end to the other in the width direction of the weak area e3.

[0079] Both the cutout e31 and the hollow hole e32 can reduce the cross-sectional area of ​​the weak zone e3, so that the minimum cross-sectional area of ​​the connecting rib 12e is located at the weak zone e3. This implementation method has a simple structure and is easy to process.

[0080] Typically, the thickness of the connecting rib 12e is uniform throughout. Since the cross-sectional area of ​​the weak zone e3 is the smallest, its width is the smallest. The design of the above-mentioned cutout e31 and the hollow hole e32 reduces the width of the connecting rib 12e to form the weak zone e3. In other embodiments, the width of the connecting rib 12e can be designed to gradually decrease from both ends to the middle, and the weak zone e3 is formed at the minimum width. The width of the weak zone e3 refers to the minimum size occupied by the solid part of the weak zone e3 in the width direction of the collection terminal 10. Figure 8 and Figure 9 If the weak area e3 is obtained by setting the cutout e31 on the connecting bar 12e, the width of the weak area e3 is as shown in the dimension D in the figure. Figure 10 If the weak area e3 is obtained by setting the upper hollow hole e32 and the cutout e31 on the connecting bar 12e, the width of the weak area e3 is the dimension D in the figure. 01 With size D 02 sum.

[0081] In some embodiments, reference Figures 2 to 7 The inner wall of the notch d1 includes an arcuate wall d11 recessed along the width of the collecting terminal 10. In other words, the notch d1 is generally arc-shaped. The arcuate wall d11 of the notch d1 helps disperse stress, preventing stress concentration and improving the tensile strength of the connecting film 12d, making it less susceptible to breakage.

[0082] In this embodiment, the inner wall of the notch d1 further includes a transverse wall d12, which is connected to one end of the curved wall d11 and extends longitudinally along the width of the collection terminal 10, away from the curved wall d11. The transverse wall d12 is located at the end of the connecting film 12d near the collection foil 11c. All connecting ribs 12e are connected to the transverse wall d12 at one end and to the curved wall d11 at the other end.

[0083] The transverse wall d12 is a straight wall structure, which extends along the width direction of the collection terminal 10. The portion of the insulating film 12 covering the collection foil 11c is called the collection film 12g. Figures 2 to 7 As shown, to reduce consumables of collection film 12g and simplify processing, collection film 12g only covers the end of collection foil 11c near connecting foil 11b. The inner wall of notch d1 near the end of collection foil 11c is designed as a straight wall rather than a curved structure. This straight wall design increases the design area of ​​collection film 12g without increasing the size of collection film 12g in the direction of collection terminal 10, improving its strength and its ability to cover collection foil 11c.

[0084] In some embodiments, reference Figures 2 to 7 The connecting foil 11 b includes a fuse b1 . In the extending direction of the collecting terminal 10 , the fuse b1 is located within the range of the notch d1 .

[0085] The fuse b1 is a thin wire extending in a curve and can melt when the current is too high to protect the battery cell. The fuse b1 is located within the notch d1 along the extension direction of the collection terminal 10, which means that the projection of the fuse b1 along the width direction of the collection terminal 10 is within the projection range of the notch d1.

[0086] The fuse b1 occupies a smaller area, and the width of the connecting film 12d covering the fuse b1 can be set smaller, so that a larger gap d1 can be formed, thereby improving the deformation ability of the connecting film 12d.

[0087] In some embodiments, reference Figures 2 to 7 The connecting foil 11b further includes a connecting portion b2, which is connected to at least one end of the fuse b1 to connect the fuse b1 to the welding foil 11a or to the collecting foil 11c, and positions the fuse b1 within the notch d1. The width of the connecting portion b2 increases as it moves away from the fuse b1.

[0088] exist Figures 2 to 7 In the illustrated embodiment, a connection portion b2 is provided at each end of the fuse b1. In other embodiments, a connection portion b2 is provided between the fuse b1 and the collection foil 11c, or between the fuse b1 and the welding foil 11a. The width of the connection portion b2 refers to the width dimension of the collection terminal 10, that is, the dimension in the Y direction.

[0089] On the one hand, while the dimension of the connecting foil 11b in the direction of the collection terminal 10 remains unchanged, the provision of the connecting portion b2 can reduce the required length of the fuse b1, preventing it from being excessively long. The resistance of fuse b1 is proportional to its length. Increasing its length increases its resistance, increasing the voltage drop across fuse b1, lowering the actual operating voltage of other components in the circuit and hindering normal operation. Furthermore, the longer the fuse b1, the greater its own power loss and the greater the energy required to open it, which can result in delayed opening of fuse b1. In this case, by occupying a certain length of the connecting foil 11b with the connecting portion b2, the required length of the fuse b1 can be shortened.

[0090] On the other hand, the width of the connecting portion b2 is gradually increased away from the fuse b1, which not only adapts to the arc-shaped notch d1 of the inner wall, but also enhances the connection strength between the connecting foil 11b and the collecting foil 11c or the connection between the connecting foil 11b and the welding foil 11a, reducing the risk of the connection being broken during the pulling process.

[0091] In addition, when the distance between the busbar 200 and the main collecting line 20 is short, a fuse b1 is provided at the connecting foil 11b and a plurality of straight connecting ribs 12e are provided, which not only efficiently utilizes space but also reduces line impedance.

[0092] It should be noted that the fuse b1 is disposed within the range of the notch d1 of the connecting film 12d, and the fuse b1 is disposed between two opposing arc-shaped walls d11. A plurality of connecting ribs 12e are disposed in the notch d1. The plurality of connecting ribs 12e prevents the fuse b1 from warping, thereby preventing loose contact with other connecting components that increases contact resistance. Warping also changes the structural stress distribution, making it more susceptible to deformation or damage. The above design avoids damage to the fuse b1 and improves overall reliability.

[0093] Figure 11 Schematic diagram of the structure of the insulating film 12 in some embodiments.

[0094] In some embodiments, reference Figure 11 The insulating film 12 includes a welding film 12f and a collection film 12g. The welding film 12f covers the welding foil 11a, and the collection film 12g covers the collection foil 11c. The welding film 12f, the connecting rib 12e, the connecting film 12d and the collection film 12g are integrally connected.

[0095] Further, refer to Figure 11 , and combined with Figures 2 to 7 A plurality of hollow windows f1 are provided on the welding film 12f. All the hollow windows f1 are arranged at intervals along the extending direction of the collection terminal 10. Each hollow window f1 exposes the welding foil 11a.

[0096] The portion of the welding foil 11a exposed by each hollow window f1 is the welding location a1, through which the welding foil 11a is welded to the main collection circuit 20. In actual use, the main collection circuit 20 is welded to multiple collection terminals 10. The welding foil 11a of each collection terminal 10 can be welded to the welding area of ​​the main collection circuit 20 using one of the welding locations a1. Different collection terminals 10 can use different welding locations a1 to weld to the welding areas of the main collection circuit 20. This allows for mass production of all collection terminals 10 to meet uniform specifications, reducing costs.

[0097] Preferably, each hollow window f1 does not exceed the range of the welding foil 11a, ensuring that the welding foil 11a near each hollow window f1 is covered and fixed by the welding film 12f, avoiding the edge of the welding foil 11a from being exposed by the hollow window f1, helping to improve the tensile strength of the welding foil 11a and prevent the welding foil 11a from warping.

[0098] In some implementations, reference Figures 2 to 7 Solder holes a2 are provided at welding positions a1. Solder flows through the holes a2 between each welding position a1 and the welding area of ​​the main collection path 20, thereby achieving a connection between each welding position a1 and the welding area of ​​the main collection path 20. Solder remains in the holes a2, which strengthens the weld strength between the welding position a1 and the welding area. Providing multiple solder holes a2 at each welding position a1 not only improves welding efficiency but also further enhances weld strength.

[0099] In some embodiments, reference Figures 2 to 7 The collection film 12g is coated on the end where the collection foil 11c connects to the connecting foil 11b. The portion of the collection foil 11c not covered by the collection film 12g is used for direct or indirect electrical connection with the battery cell's terminal to collect the cell's voltage information. In this case, the collection film 12g is only coated on one end of the collection foil 11c, which significantly reduces the amount of insulating film 12 used and simplifies the manufacturing process of the collection terminal 10.

[0100] In a specific embodiment of the present application, the collection terminals 10 are symmetrically arranged. Each notch d1 is provided with a first connecting rib e1 and a second connecting rib e2. The first connecting rib e1 is located on the outside, forming a first hollow region d21 between the first and second connecting ribs e1 and e2, and a second hollow region d22 between the second connecting rib e2 and the connecting membrane 12d. Weakened regions e3 are provided on each of the first and second connecting ribs e1 and e2, with notches e31 formed on either side of the weakened regions e3.

[0101] In another specific embodiment of the present application, the first connecting rib e1 is located on the outside. A first hollow area d21 is formed between the first connecting rib e1 and the second connecting rib e2, and a second hollow area d22 is formed between the second connecting rib e2 and the connecting membrane 12d. The first connecting rib e1 is provided with a weak area e3 with notches e31 formed on both sides of the weak area e3, while the second connecting rib e2 does not have a weak area e3. This improves the strength of the second connecting rib e2 and enhances the protection of the fuse b1, even if the first connecting rib e1 is fractured first.

[0102] As long as the above embodiments do not conflict with each other, they can be freely combined to obtain more embodiments.

[0103] In addition, the battery provided in the embodiment of the present application includes a cell, a current bus 200 and the collection assembly 100 in any of the above embodiments, wherein the current bus 200 is connected to the pole of the cell. The collection foil 11 c is connected to the current bus 200 .

[0104] The busbar 200 is a conductive member (such as a copper busbar or an aluminum busbar) that is electrically connected to the pole of the battery cell. Specifically, the collection foil 11c and the busbar 200 are ultrasonically welded. The busbar 200 is connected to the pole by welding.

[0105] Figure 12 Schematic diagram of the structure of the busbar 200 in some embodiments.

[0106] In a specific embodiment, combining Figure 12 It is understood that the opposing ends of the busbar 200 are connected to the poles of different battery cells. A rib 201 is provided in the middle region between the opposing ends of the busbar 200. Ribs 201 are recessed along the thickness of the busbar 200. The inner and outer walls of rib 201 match in shape, and the cross-sectional length of rib 201 is L0. Within each notch d1, the hollow area d2 formed by the outermost connecting rib 12e is the first hollow area d21. The maximum dimension of the first hollow area d21 along the width of the collection terminal 10 is L1, satisfying L1 ≥ L0 / 2.

[0107] It should be noted that N battery cells are arranged side by side to form a battery cell group, and the opposite ends of the busbar 200 in the Y direction are connected to the poles of two adjacent battery cells. The ribs 201 can be concave along the thickness of the busbar 200, either toward the side where the battery cells are located or away from the side where the battery cells are located. The inner and outer walls of the ribs 201 match in shape, indicating that the thickness of the ribs 201 is substantially consistent with the thickness of the rest of the busbar 200. The ribs 201 can be formed by stamping or other methods. The ribs 201 extend roughly in the X direction in a strip-like shape to both ends of the busbar 200.

[0108] The cross section of the concave rib 201 is a cross section perpendicular to its extension direction. The cross section length L0 can be understood as the length of the concave rib 201 in the Y direction after being straightened, or as the extension length of its cross section shape.

[0109] The first hollow area d21 is formed by the outermost connecting rib 12e within the notch d1 and its adjacent inner connecting rib 12e. The larger the maximum dimension L1 of the first hollow area d21 along the width of the terminal 10, the greater the deformation space of the terminal 10 after the outermost connecting rib 12e breaks, and the adjacent inner connecting rib 12e is less likely to break.

[0110] When the battery pack expands, the busbar assembly 200 deflects leftward or rightward along the Y-axis, following the cells. The maximum deflection is determined by the degree to which the ribs 201 are flattened. Theoretically, the left-right deflection distance of the busbar assembly 200 evenly divides the length of the recessed cross section, meaning the maximum unilateral deflection of the busbar assembly 200 is L0 / 2. In this case, L1 ≥ L0 / 2. When the cells experience maximum expansion, flattening the busbar ribs 201, the collection terminal 10 remains within the deformation range provided by the first hollowed-out area d21, without damaging the inner connecting ribs 12e. This improves the reliability of the collection terminal 10.

[0111] Figure 13 Schematic diagram of a portion of the collection terminal 10 in some embodiments.

[0112] In a specific embodiment, N battery cells are arranged side by side to form a battery cell group, and the expansion force and expansion deformation of the battery cell group are F and L respectively. 膨 . Combined Figure 13 It is understood that the collection terminal 10 has a symmetrical structure. A first connecting rib e1 and a second connecting rib e2 are provided in each notch d1 of the collection terminal 10, and the first connecting rib e1 is arranged close to the outer side of the connecting membrane 12d. A first weak area is provided on the first connecting rib e1, and a second weak area is provided on the second connecting rib e2. The maximum dimension of the first hollow area d21 formed by the first connecting rib e1 in the width direction of the collection terminal 10 is L1. The thickness and tensile strength of the first weak area and the second weak area are t and σ respectively. The distance from the center of the first weak area and the center of the second weak area to the end of the collection foil 11c away from the connecting foil 11b is S. The width D1 of the first weak area and the width D2 of the second weak area satisfy: D1=F1 / (σt), D2=F2 / (σt); wherein, F1=Fcosθ1, θ1=arctan(M1 / S), F2=Fcosθ2, θ2=arctan(M2 / S), M=L 膨 / N, M1=L1, M2=M.

[0113] Specifically, the expansion force F and expansion deformation L of the battery pack 膨The thickness t and the tensile strength σ are the thickness and tensile strength of the insulating film 12 , respectively. The thickness t is determined according to production requirements, and the tensile strength σ is determined according to the material of the insulating film 12 .

[0114] Expansion deformation of the battery pack L 膨 Divide by the number of cells in parallel to obtain the expansion deformation M of a single cell. L1 is the maximum dimension of the first hollow area d21 in the Y direction, determined by the solution in the above embodiment. M1 is the maximum displacement of the collection terminal 10 after the first connecting rib e1 breaks, and M1 is equal to L1. M2 is the maximum displacement of the collection terminal 10 after the second connecting rib e2 breaks, and M2 is equal to M.

[0115] The distance from the center of the first weak zone and the center of the second weak zone to the end of the collection foil 11c facing away from the connecting foil 11b is S, where S is the design value. The center of the weak zone e3 is its geometric center. Specifically, if the weak zone e3 is designed by setting a notch e31 on the connecting rib 12e, the center of the weak zone e3 is located at the center of the minimum width of the notch e31. If the weak zone e3 is designed by setting a notch e31 and a hollow hole e32 on the connecting rib 12e, the center of the weak zone e3 is the size D 01 The center and dimension D of the indicated part 02 The center position of the line connecting the centers of the pointed parts.

[0116] Under the action of the expansion force F of the battery cell group, the offset angle θ1 generated by the collection terminal 10 when the first weak area breaks is arctan(M1 / S), and the tensile force F1=Fcosθ1 applied to the first weak area can be determined. When the second weak area breaks, the offset angle θ2 generated by the collection terminal 10 is arctan(M2 / S), and the tensile force F2=Fcosθ2 applied to the second weak area can be determined.

[0117] After determining F1 and F2, the width D1 of the first weak area and the width D2 of the second weak area are determined according to D1=F1 / (σt) and D2=F2 / (σt), so as to determine the structures of the first weak area and the second weak area.

[0118] In one specific embodiment, the width D1 of the first weak zone is smaller than the width D2 of the second weak zone. This allows the first connecting rib e1 to break before the second connecting rib e2, thereby relatively increasing the strength of the second connecting rib e2 and balancing practicality and reliability. In one specific embodiment, the distances from the center of the first weak zone and the center of the second weak zone to the end of the collection foil 11c facing away from the connecting foil 11b are S1 and S2, respectively, where S1 ≠ S2. As a result, when the first and second connecting ribs e1 and e2 break simultaneously, they break at different locations, further preventing warping of the connecting film 12d and the fuse b1.

[0119] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A collection component, characterized in that: include: A collecting terminal (10) comprises a metal foil (11) and an insulating film (12); the metal foil (11) is divided into a welding foil (11a), a connecting foil (11b) and a collecting foil (11c) along an extension direction of the collecting terminal (10); as well as The main collecting path (20) comprises a plurality of welding areas arranged at intervals; the welding foil (11a) is welded to one of the plurality of welding areas arranged at intervals along the extending direction of the collecting terminal (10) of the main collecting path (20); The insulating film (12) comprises a connecting film (12d) and a connecting rib (12e); the connecting film (12d) covers the connecting foil (11b); and notches (d1) are formed on opposite sides of the connecting film (12d) and are concavely arranged along the width direction of the collecting terminal (10); N connecting ribs (12e) are provided in each notch (d1), and both ends of each connecting rib (12e) in the extension direction of the collecting terminal (10) are connected to the inner wall of the notch (d1). All the connecting ribs (12e) are sequentially spaced along the width direction of the collecting terminal (10), and separate the notch (d1) into n hollow areas (d2), where n is greater than or equal to 2. A weak area (e3) is provided on at least the outermost connecting rib (12e), and the minimum cross section of the connecting rib (12e) is located in the weak area (e3).

2. The collection component according to claim 1, characterized in that: At least part of the connecting rib (12e) extends longitudinally along the extension direction of the collecting terminal (10) to form a straight strip; and / or, Part of the connecting rib (12e) bends and extends in the extension direction of the collecting terminal (10).

3. The collection component according to claim 1, characterized in that: In the same notch (d1), the closer to the outside of the connecting film (12d), the larger the maximum size of the hollow area (d2) in the width direction of the collecting terminal (10).

4. The collection component according to claim 1, characterized in that: The weak area (e3) is provided on each connecting rib (12e) of each notch (d1), and in the same notch (d1), the closer to the outer side of the connecting membrane (12d), the smaller the cross-sectional area of ​​the weak area (e3) on the connecting rib (12e); and / or, The two notches (d1) are symmetrically arranged along a symmetry plane parallel to the extension direction of the collection terminal (10), and the connecting ribs (12e) and the weak areas (e3) in each notch (d1) are symmetrically arranged relative to the symmetry plane.

5. The collection component according to claim 1, characterized in that: A cutout (e31) and / or a hollow hole (e32) is formed on the connecting rib (12e) where the weak area (e3) is located. The cutout (e31) is recessed along the width direction of the collecting terminal (10), and the hollow hole (e32) is through-set along the thickness direction of the collecting terminal (10).

6. The collection assembly according to any one of claims 1 to 5, characterized in that: The inner wall of the notch (d1) comprises an arc-shaped wall (d11) that is recessed in an arc shape along the width direction of the collecting terminal (10).

7. The collection component according to claim 6, characterized in that: The inner wall of the notch (d1) further comprises a transverse wall (d12), the transverse wall (d12) being connected to one end of the arcuate wall (d11) and extending longitudinally away from the arcuate wall (d11) along the width direction of the collection terminal (10), the transverse wall (d12) being located at one end of the connecting film (12d) close to the collection foil (11c); One end of all the connecting ribs (12e) is connected to the transverse wall (d12), and the other end is connected to the arc-shaped wall (d11).

8. The collection assembly according to any one of claims 1 to 5, characterized in that: The connecting foil (11b) comprises a fuse (b1), and in the extending direction of the collecting terminal (10), the fuse (b1) is located within the range of the notch (d1).

9. A battery, characterized in that: include: battery cells; A current collector (200) connected to the pole of the battery cell; and The collecting assembly according to claim 8, wherein the collecting foil (11c) is connected to the current collecting piece (200).

10. The battery according to claim 9, characterized in that The opposite ends of the current collector (200) are respectively connected to the poles of different battery cells; The concave rib (201) is provided in a middle area of ​​the current collector (200) between the two opposite ends, the concave rib (201) is recessed along the thickness direction of the current collector (200), the inner wall and outer wall of the concave rib (201) are matched in shape, and the cross-sectional length of the concave rib (201) is L0; In each of the notches (d1), the hollow area (d2) formed by the outermost connecting rib (12e) is a first hollow area (d21), and the maximum dimension of the first hollow area (d21) in the width direction of the collection terminal (10) is L1, satisfying the following condition: L1≥L0 / 2.

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