Acquisition assembly and battery

Abstract

The invention relates to an acquisition assembly and a battery. The acquisition assembly comprises an acquisition terminal and an acquisition main circuit. The acquisition terminal comprises a metal foil and an insulating film. The metal foil is divided into a welding foil, a connecting foil and an acquisition foil along the extension direction of the acquisition terminal. The acquisition main circuit comprises a plurality of welding areas which are arranged at intervals, and the welding foil is selected from the plurality of welding areas which are arranged at intervals along the extension direction of the acquisition terminal of the acquisition main circuit to be welded with the welding foil. The insulating film comprises a connecting film and a connecting rib, the connecting film wraps the connecting foil, and notches are formed in the two opposite sides of the connecting film in an inwards-concave mode. N connecting ribs are arranged in each gap, the two ends of each connecting rib in the extension direction of the acquisition terminal are connected to the inner wall of the gap, all the connecting ribs are sequentially spaced along the width direction of the acquisition terminal and divide the gap into n hollow areas, and n is greater than or equal to 2; and a weak area is arranged on the connecting rib which is provided with the notch and is at least positioned on the outermost side. The acquisition terminal can be effectively prevented from being broken and falling off due to tension, and the welding reliability of the acquisition terminal is ensured.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a collection component and a battery. Background Art

[0002] A battery is formed by combining multiple battery cells in series or parallel. The battery can collect the working signals of each battery cell through a collection component. Specifically, the collection component includes a collection main path and collection terminals. The collection terminals are connected to the battery cells to collect the working signals of the battery cells, and the collection main path is used to send the working signals collected by the collection terminals to the corresponding processing device. To reduce costs, the collection terminals and the collection main path are mostly connected by welding. After the battery is charged and discharged for a long time, the adjacent battery cells expand and deform, causing a relative position change between the collection main path and the battery cells. The collection terminals are pulled, and the welding joints between the collection terminals and the collection main path are prone to failure such as tearing and falling off.

[0003] In the related art, a buffer section is arranged in the collection terminal, and the deformation of the buffer section is used to adapt to the expansion of the battery cell. During the production process, when the collection terminal is welded to the collection main path, the buffer section is easily deformed by a slight external force and the welding position is changed, resulting in poor welding and affecting the battery performance. Summary of the Invention

[0004] Based on this, it is necessary to provide a collection component and a battery for solving the problem that the welding between the collection terminal and the collection main path is prone to be poor.

[0005] In a first aspect, this application provides a collection component, including: A collection terminal, including a metal foil and an insulating film, the metal foil is divided into a welding foil, a connecting foil, and a collection foil along the extending direction of the collection terminal; and A collection main path, including 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 collection terminal of the collection main path. Wherein, the insulating film includes a connecting film and connecting ribs. The connecting film covers the connecting foil. Concave notches are formed on both opposite sides of the connecting film along the width direction of the collection terminal. Each notch is provided with n connecting ribs. Both ends of each connecting rib in the extending direction of the collection terminal are connected to the inner wall of the notch where it is located. All the connecting ribs are spaced in sequence along the width direction of the collection terminal and divide the notch where they are located into n hollow areas. n≥2, and at least the outermost connecting rib is provided with a weak area, and the minimum cross-section of the connecting rib is located in the weak area.

[0006] In some embodiments, at least part of the connecting ribs extend longitudinally along the extending direction of the collection terminal in a straight strip shape.

[0007] In some embodiments, some of the connecting ribs bend and extend in the extending direction of the collecting terminal.

[0008] In some embodiments, in the same notch, the closer to the outer side of the connecting film, the larger the maximum dimension of the hollowed-out area in the width direction of the collecting terminal.

[0009] In some embodiments, a 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 film, the smaller the cross-sectional area of the weak area on the connecting rib.

[0010] In some embodiments, the two notches are symmetrically arranged along a symmetry plane parallel to the extending direction of the collecting terminal, and the connecting ribs and the weak areas in each notch are symmetrically arranged relative to the symmetry plane.

[0011] In some embodiments, a notch and / or a hollowed-out hole is formed on the connecting rib where the weak area is located, the notch is recessed along the width direction of the collecting terminal, and the hollowed-out hole penetrates along the thickness direction of the collecting terminal.

[0012] 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.

[0013] In some embodiments, the inner wall of the notch further includes a transverse wall, the transverse wall is connected to one end of the arc-shaped wall, and extends longitudinally along the width direction of the collecting terminal away from the arc-shaped wall, and the transverse wall is located at one end of the connecting film close to the collecting foil; One end of all the connecting ribs is connected to the transverse wall, and the other end is connected to the arc-shaped wall.

[0014] 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 where the notch is located.

[0015] In a second aspect, the present application provides a battery, including: a battery cell; a bus bar connected to the pole of the battery cell; and a collecting component as described in any one of the above embodiments, and the collecting foil is connected to the bus bar.

[0016] In some embodiments, the opposite ends of the bus bar are respectively connected to the poles of different battery cells; A concave rib is provided in the middle area between the opposite ends of the bus bar, the concave rib is recessed along the thickness direction of the bus bar, the inner wall and the outer wall of the concave rib are in matching shapes, and the cross-sectional length of the concave rib is L0; In each of the gaps, the hollow area formed by the outermost connecting rib is the first hollow area, and the maximum dimension of the first hollow area in the width direction of the acquisition terminal is L1, satisfying: L1≥L0 / 2.

[0017] The present application has the following beneficial effects: In the above-mentioned acquisition component and battery, by providing gaps on both sides of the connection film, arranging a plurality of connecting ribs in the gaps, and arranging a weak area at least on the outermost connecting rib, when the position of the battery cell and the acquisition main circuit changes due to reasons such as the expansion of the battery cell, the connecting rib can break from the weak area, and the hollow area formed by the broken connecting rib allows the acquisition terminal to deform to adapt to the above-mentioned position change, avoiding the fracture and detachment of the acquisition terminal. Moreover, the arrangement of a plurality of connecting ribs in the gap strengthens the position stability of the connection film during the welding of the acquisition terminal multiple times, avoiding poor welding, compensating for the adverse impact of the gap arrangement on the position stability of the connection film, and realizing a multi-level protection effect on the connection film, reducing the risk of the connection film being pulled off. Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 It is a schematic structural diagram of an acquisition component of some embodiments.

[0019] Figures 2 to 7 It is a schematic structural diagram of acquisition terminals in different embodiments.

[0020] Figures 8 to 10 It is a schematic structural diagram of the weak area in different embodiments.

[0021] Figure 11 It is a schematic structural diagram of an insulating film of some embodiments.

[0022] Figure 12 It is a schematic structural diagram of a bus bar of some embodiments.

[0023] Figure 13 It is a partial schematic diagram of an acquisition terminal of some embodiments.

[0024] The reference numerals in the specific embodiments are as follows: 100. Acquisition component; 10. Acquisition terminal; 11. Metal foil; 11a. Welding foil; a1. Welding position; a2. Solder hole; 11b. Connection foil; b1. Fuse; b2. Connection part; 11c. Acquisition foil; 12. Insulating film; 12d. Connection film; d1. Notch; d11. Arc-shaped wall; d12. Transverse wall; d2. Hollowed-out area; d21. First hollowed-out area; d22. Second hollowed-out area; 12e. Connecting rib; e1. First connecting rib; e2. Second connecting rib; e3. Weak area; e31. Cut; e32. Hollowed-out hole; 12f. Welding film; f1. Hollowed-out window; 12g. Acquisition film; 20. Main acquisition path; 21. Connection terminal; 200. Bus bar; 201. Concave rib. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if used, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0027] In addition, if used, the terms "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In this application, unless otherwise clearly defined and limited, if the terms "installed", "connected", "linked", "fixed", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In this application, if it appears, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if it appears, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0031] In view of the problems pointed out in the background art, an embodiment of this application proposes a collection component and a battery.

[0032] The battery in the embodiment of this application includes a battery cell and a collection component. The collection component is used to collect the working signal of the battery cell. The battery cell can be a secondary battery or a primary battery. The battery cell 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 in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0033] In one embodiment, a battery cell generally includes an end cap, a housing, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, an accommodation cavity is formed inside the housing, and at least one end of the housing is open. The end cap covers the open end of the housing to enclose the accommodation cavity, and the electrode assembly is loaded into the accommodation cavity. The housing can be, but is not limited to, a metal housing, such as an aluminum housing, a steel housing, etc. The battery cell includes a terminal post, and the terminal post is connected to the tab of the electrode assembly. Optionally, the terminal post protrudes from the end cap. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet, and a separator that separates the positive electrode sheet and the negative electrode sheet. An electrolyte can be injected into the battery cell, and the electrolyte can infiltrate into the interior of the electrode assembly to provide an ion migration path for the electrode assembly to carry out electrochemical reactions and play a role in conducting electricity. The electrode assembly can be in the form of a wound type, a stacked type, etc. One or more electrode assemblies can be loaded into the battery cell.

[0034] 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 a plurality of the above-mentioned battery cells. The plurality of battery cells can be electrically connected in series, in parallel, or in a hybrid manner of series and parallel. The acquisition component is connected to the battery cells and the battery management system. The acquisition component acquires information such as the temperature / voltage of the battery cells and transmits it to the battery management system so that the battery management system can control and monitor the working states of the respective battery cells. In addition, the plurality of battery cells can also form a battery module through the acquisition component and the module management system, and then a plurality of battery modules are electrically connected in series, in parallel, or in a hybrid manner of series and parallel, and together with the battery management system, they form a battery pack.

[0035] The acquisition component in the embodiments of the present application will be introduced below.

[0036] Figure 1 It is a schematic structural diagram of the acquisition component 100 in some embodiments. Figures 2 to 7 It is a schematic structural diagram of the acquisition terminal 10 in different embodiments of the present application.

[0037] Please refer to Figure 1 and Figure 2It is understood that the acquisition component 100 proposed in the embodiments of the present application includes an acquisition terminal 10 and an acquisition main path 20. The acquisition terminal 10 includes a metal foil 11 and an insulating film 12. The metal foil 11 is divided into a welding foil 11a, a connection foil 11b, and an acquisition foil 11c along the extension direction of the acquisition terminal 10. The acquisition main path 20 includes 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 extension direction of the acquisition terminal 10 of the acquisition main path 20. Among them, the insulating film 12 includes a connection film 12d and connecting ribs 12e. The connection film 12d covers the connection foil 11b, and notches d1 recessed along the width direction of the acquisition terminal 10 are formed on both opposite sides of the connection film 12d. Each notch d1 is provided with n connecting ribs 12e. Both ends of each connecting rib 12e in the extension direction of the acquisition terminal 10 are connected to the inner wall of the corresponding notch d1. All the connecting ribs 12e are arranged at intervals in sequence along the width direction of the acquisition terminal 10, and the corresponding notch d1 is divided into n hollow areas d2. n≥2, and at least the outermost connecting rib 12e is provided with a weak area e3, and the minimum cross-section of the connecting rib 12e is located in the weak area e3.

[0038] The acquisition terminal 10 is formed by the insulating film 12 covering the metal foil 11. The metal foil 11 can be a copper foil, an aluminum foil, a silver foil, etc. The insulating film 12 can be a PI film, a PET film, etc. Specifically, along the extension direction of the acquisition terminal 10, the metal foil 11 is sequentially divided into a welding foil 11a, a connection foil 11b, and an acquisition foil 11c. Both the acquisition foil 11c and the welding foil 11a have parts exposed by the insulating film 12, and the part of the acquisition foil 11c exposed by the insulating film 12 is used for directly or indirectly electrically connecting to the pole column of the battery cell through a bus bar 200, and the part of the welding foil 11a exposed by the insulating film 12 is welded to the acquisition main path 20.

[0039] The acquisition main path 20 can be a flexible printed circuit board (FPC). Preferably, the acquisition main path 20 is a flat flexible cable (FFC). The flat flexible cable (FFC) includes a plurality of wires arranged side by side, and each wire is in a flat shape. The side-by-side direction of the wires corresponds to the extension direction of the acquisition terminal 10 (corresponding to the X direction in the figure). The flexible printed circuit board (FPC) is mostly obtained by etching its circuit. Compared with the flexible printed circuit board (FPC), the flat flexible cable (FFC) is composed of wires to form its circuit, with lower manufacturing cost and more environmental protection. The acquisition main path 20 includes a connection terminal 21, and the connection terminal 21 is signal-connected to a battery management system or a module management system, and is used to transmit the working signal (including voltage information) of the acquisition component 100 for acquiring the battery cell to the battery management system or the module management system.

[0040] In practical applications, the acquisition main path 20 is welded to a plurality of acquisition terminals 10. Each acquisition terminal 10 extends along the width direction of the acquisition main path 20 (that is, the extension direction of the acquisition terminal 10 is basically the same as the width direction of the acquisition main path 20), so as to enable the acquisition component 100 to simultaneously acquire the working signals of multiple battery cells. When the acquisition component 100 is applied to a battery, N battery cells in the battery are arranged side by side to form a battery cell group. The acquisition main path 20 extends along the side-by-side direction of the battery cell group. Each acquisition terminal 10 is directly or indirectly electrically connected to the electrode posts of each battery cell in the battery cell group through its acquisition foil 11c.

[0041] The multiple welding areas are arranged at intervals along the extension direction of the acquisition terminal 10, including multiple situations. One situation is that the welding areas are spaced along the extension direction of the acquisition terminal 10 and are staggered in the extension direction of the acquisition main path 20 (corresponding to the Y direction in the figure). At this time, each acquisition terminal 10 can be welded to a different welding area according to its arrangement position in the extension direction of the acquisition main path 20. Another situation is that multiple welding areas are arranged side by side along the extension direction of the acquisition terminal 10 to form a welding group. Each acquisition terminal 10 corresponds to a welding group, and the welding foil 11a of the acquisition terminal 10 is welded to one of the welding areas in the corresponding welding group. Multiple welding groups can be arranged on the acquisition main path 20 to be welded to different acquisition terminals 10. It is worth mentioning that a protective layer (such as a protective film layer, a protective coating) can be laid at the welding connection between the acquisition terminal 10 and the acquisition main path 20 to isolate the welding connection from the air and prevent short circuits caused by corrosion of this place by water vapor. A protective layer can be laid outside the welding areas in the welding group that are not welded to the acquisition terminal 10.

[0042] The part of the insulating film 12 covering the connection foil 11b is the connection film 12d, and the connection film 12d basically wraps the entire connection foil 11b. Notches d1 are formed on both sides of the connection film 12d in the width direction of the acquisition terminal 10 (corresponding to the Y direction). The notches d1 are recessed along the width direction of the acquisition terminal 10 (open outward along the Y direction). The shape of the notches d1 can be square, arc-shaped, or other irregular shapes.

[0043] The insulating film 12 further includes connecting ribs 12e. A plurality of connecting ribs 12e are arranged in each notch d1, and each connecting rib 12e is arranged in a strip shape such as a curve or a straight line in the extending direction of the collecting terminal 10. The plurality of connecting ribs 12e in the same notch d1 are spaced apart in the width direction of the collecting terminal 10, and the notch d1 is divided to form a plurality of hollow areas d2 arranged in sequence in the width direction of the collecting terminal 10. The number of the hollow areas d2 is equivalent to the number of the connecting ribs 12e. The connecting ribs 12e are arranged in the width direction, so that the entire collecting terminal 10 can realize information collection in a relatively compact plane, which is beneficial to the layout in the limited space inside the battery. Optionally, the connecting rib 12e is integrally connected with the connecting film 12d forming the notch d1, thereby reducing the use of raw materials, lowering the manufacturing cost, reducing the weight of the collecting terminal 10, and being convenient for production and reducing the production cost.

[0044] In each notch d1, a weak area e3 is arranged on at least the outermost connecting rib 12e (i.e., the connecting rib 12e closest to the open end of the notch d1). The cross section of the connecting rib 12e is perpendicular to its extending direction (substantially the same as the extending direction of the collecting terminal 10), and the minimum 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 the rest of the connecting rib 12e. When the battery cell expands or is subjected to external vibration or impact, and the force borne by the connecting rib 12e exceeds the design limit, the stress will be preferentially concentrated in the weak area e3 of the outermost connecting rib 12e, resulting in the fracture of the weak area e3 of the outermost connecting rib 12e first, avoiding the direct transmission of stress to the arc-shaped wall d11. Since the fuse b1 is arranged between the two arc-shaped walls d11, the fracture of the fuse b1 can be avoided. Even if the outermost connecting rib 12e breaks, since there are still connecting ribs 12e (n≥2) on the inner side for connection, the innermost arc-shaped wall d11 close to the fuse b1 will not be torn, and the collecting function can still be maintained. This is much better than the entire collecting terminal 10 suddenly and completely breaking at the welding joint, reducing the occurrence of the detachment and fracture of the welding foil 11a, the connecting foil 11b and the collecting foil 11c of the collecting terminal 10, and improving the robustness and maintainability of the entire battery.

[0045] When the collecting component 100 is applied to a battery cell group, there is a large component force of the expansion force of the battery cell in the width direction of the collecting terminal 10. Under the action of this component force, displacement is likely to occur between the battery cell and the collecting main path 20 in the width direction (corresponding to the Y direction) of the collecting terminal 10.

[0046] In actual application, combined with Figure 2It is understood that when the battery cell is shifted rightward in the Y direction relative to the main collection path 20, the connecting ribs 12e within the left notch d1 are subjected to tensile force, and the connecting ribs 12e within the right notch d1 are subjected to compressive force. Among the ones subjected to tensile force, the weak area e3 on the outermost connecting rib 12e fractures preferentially. The hollow area d2 formed by the fractured connecting ribs 12e reduces the restriction of the insulating film 12 on the collection terminal 10 due to the shift of the collection terminal 10, enabling the collection terminal 10 to deform and adapt to the change in the relative position between the battery cell and the main collection path 20, and preventing the welded joints of the collection terminal 10 from breaking or falling off. Each hollow area d2 in the part subjected to compressive force can absorb a part of the external force and allow the collection terminal 10 to be deformed by extrusion towards this side, reducing the resistance of the insulating film 12 to the deformation of the collection terminal 10, and further reducing the possibility of faults such as fracture of the collection terminal 10 due to mechanical damage.

[0047] Moreover, heat is generated during the operation of the battery cell, especially at the pole posts and bus bars 200 of the battery cell, where the temperature is significantly higher than other positions. The collection terminal 10 is arranged at the pole posts and bus bars 200. The hollow area d2 helps to dissipate heat, improves the local heat dissipation environment of the collection terminal 10, reduces the operating temperature of the collection terminal 10, and enables it to operate within a relatively stable temperature range.

[0048] In addition, multiple connecting ribs 12e are arranged within the notch d1. First, the multiple connecting ribs 12e play a multiple positioning role for the connecting film 12d, thereby enhancing the position stability of the connecting film 12d during the welding process multiple times, compensating for the adverse effect of the arrangement of the notch d1 on the position stability of the connecting film 12d, and effectively preventing the connecting film 12d from undergoing micro-deformation during the welding of the collection terminal 10 and ensuring the welding quality. Second, due to the different arrangement positions of the multiple connecting ribs 12e, the outermost connecting ribs 12e are subjected to greater tensile force, and the outermost connecting ribs 12e are more likely to fracture compared to the inner connecting ribs 12e. When the outermost connecting ribs 12e are fractured by tensile force, the inner connecting ribs 12e can still play an anti-tensile effect, effectively preventing the connecting film 12d from being pulled apart and playing a multi-level protection role for the connecting film 12d.

[0049] The above-mentioned acquisition component 100 sets notches d1 on both sides of the connection film 12d, sets a plurality of connecting ribs 12e in the notches d1, and sets a weak area e3 on at least the outermost connecting rib 12e. When the position of the battery cell changes due to reasons such as battery cell expansion, the connecting rib 12e can break from the weak area e3. The hollow area d2 formed by the broken connecting ribs 12e allows the acquisition terminal 10 to deform to adapt to the above-mentioned position change, avoiding breakage and detachment of the acquisition terminal 10. Moreover, the setting of a plurality of connecting ribs 12e in the notch d1 multiplicatively strengthens the position stability of the connection film 12d during the welding of the acquisition terminal 10, avoids poor welding, makes up for the adverse effect of the setting of the notch d1 on the position stability of the connection film 12d, and can achieve a multi-level protection effect on the connection film 12d, reducing the risk of the connection film 12d being pulled and broken.

[0050] Understandably, the maximum width of the connecting rib 12e in the Y direction is smaller than the minimum width of the connection film 12d between the two notches d1, so that the connecting rib 12e breaks preferentially due to its weak tensile capacity, playing a role in protecting the connection film 12d.

[0051] In some embodiments, as Figures 2 to 6 shown, at least part of the connecting ribs 12e extend longitudinally along the extension direction of the acquisition terminal 10 in a straight strip shape. Specifically, all the connecting ribs 12e can extend in a straight strip shape along the X direction, or part of the connecting ribs 12e can extend in a straight strip shape along the X direction. At this time, the connecting ribs 12e in a straight strip shape are more conducive to ensuring the position stability of the connection film 12d, and the processing is simpler, easier to implement, with high processing efficiency, and reduces the processing cost of the acquisition terminal 10.

[0052] In some embodiments, as Figure 7 shown, part of the connecting ribs 12e extend in a bent shape along the extension direction of the acquisition terminal 10. In the Figure 7 shown embodiment, two connecting ribs 12e are set in each notch d1 of the acquisition terminal 10. The outermost connecting rib 12e extends in a bent shape along the X direction, and the innermost connecting rib 12e extends in a straight strip shape along the X direction. At this time, the connecting rib 12e extending in a bent shape has strong deformation ability and is not easily pulled and broken.

[0053] Specifically, the connecting rib 12e extending in a bent shape is arranged on the outside of the notch d1. When the battery cell expands or is impacted by an external force, the outermost connecting rib 12e is subjected to a greater pulling force. At this time, the outermost connecting rib 12e is set to extend in a bent shape. The connecting rib 12e extending in a bent shape allows a certain amount of telescopic deformation in the length direction of the buffer area, and its strong deformation ability can deform under a greater pulling force and is not easily pulled and broken, so as to absorb the stress caused by this thermal expansion difference or impact and avoid connection failure caused by stress accumulation.

[0054] When part of the connecting rib 12e is bent and extended, the rest of the connecting rib 12e should be straight and extended to ensure the positioning and fixing effect of the connecting rib 12e on the connecting film 12d as a whole, and to ensure the position stability of the connecting film 12d during the welding process. When all the connecting ribs 12e are straight, the position stability of the connecting film 12d during the welding process is the best.

[0055] 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 .

[0056] The maximum dimension of the hollow area d2 in the width direction of the collection terminal 10 is its width. Figure 13 L1 and L2 refer to the width of the first hollow area d21 and the width of the second hollow area d22, respectively. At this time, in the Y direction, the closer to the outside of the connecting film 12d, the wider the hollow area d2 is. That is, the width of the outer hollow area d2 is greater than the width of the inner hollow area d2.

[0057] Combination Figure 2 It is understood that when the collection terminal 10 is pulled and deviates to the left in the Y direction, the connecting rib 12e in the notch d1 on the right side is pulled, and the outer connecting rib 12e is subjected to 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, the greater the deformation capacity of the collection terminal 10, the higher the degree of displacement it can adapt to, and the stronger the ability of the collection terminal 10 to resist the breakage and detachment of the welding connection. Moreover, it can also effectively protect the inner connecting rib 12e, making it difficult for the inner connecting rib 12e to break, thereby improving the strength of the insulating film 12.

[0058] 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 outer side of the connecting film 12d, the smaller the cross-sectional area of the weak area e3 on the connecting rib 12e.

[0059] The smaller the cross-sectional area of the weak area e3, the smaller the ultimate bearing capacity, and the easier it is to break. At this time, in each notch d1, the cross-sectional area of the weak area e3 on the outer connecting rib 12e is smaller than the cross-sectional area of the weak area e3 on the inner connecting rib 12e, and the outer connecting rib 12e is easier to break than the inner connecting rib 12e.

[0060] In actual application, taking the example of setting two connecting ribs 12e in each notch d1 for illustration. When the pulling force applied to the collecting terminal 10 reaches the first tensile force, the outermost connecting rib 12e breaks. As the pulling force increases, when the pulling force applied to the collecting terminal 10 reaches the second tensile force, the innermost connecting rib 12e breaks. As the pulling force continues to increase, when the pulling force applied to the collecting terminal 10 reaches the third tensile force, the connecting film 12d breaks. When the pulling force is greater than the first tensile force and less than the second tensile force, the innermost connecting rib 12e is not damaged. When the pulling force is greater than the second tensile force and less than the third tensile force, the connecting film 12d is not damaged. At this time, multiple connecting ribs 12e from the outside to the inside are successively broken as the pulling force increases, realizing multi-level protection for the connecting film 12d.

[0061] There are various ways to set the weak area e3 on the connecting rib 12e. For example, the weak area e3 is set on all the connecting ribs 12e of each notch d1, or the weak area e3 is only set on some of the outer connecting ribs 12e. The weak area e3 can be arranged at one end of the connecting rib 12e close to the collecting foil 11c, or can be arranged at one end of the connecting rib 12e close to the welding foil 11a, or can be arranged at the middle position of the connecting rib 12e. Of course, the arrangement quantity of the connecting ribs 12e in each notch d1, the arrangement position and the arrangement quantity of the weak area e3 can be the same or different, as long as it can ensure that the connecting rib 12e breaks smoothly when the collecting terminal 10 is pulled and reaches the ultimate bearing capacity.

[0062] In a preferred embodiment, the two notches d1 are symmetrically arranged along a symmetry plane parallel to the extension direction of the collecting terminal 10, and the connecting ribs 12e and the weak area e3 in each notch d1 are both symmetrically arranged relative to this symmetry plane.

[0063] Preferably, the collecting terminal 10 is generally symmetrically arranged along this symmetry plane. When the notch d1, the connecting rib 12e and the weak area e3 are symmetrically arranged along the same symmetry plane, whether the collecting terminal 10 deflects to the left or to the right, the stress concentration area on the collecting terminal 10 and the resulting fracture effect can remain consistent, which can better ensure the consistency of the product. Moreover, from the perspective of design and production, the symmetrical design of the structure reduces the checking difficulty and improves the processing efficiency.

[0064] Figures 8 to 10 It is a schematic diagram of the structure of the weak area e3 in different embodiments.

[0065] In some embodiments, referring to Figures 8 to 10 , on the connecting rib 12e where the weak area e3 is located, there are formed a notch e31 and / or a hollow hole e32. The notch e31 is recessed along the width direction of the collecting terminal 10, and the hollow hole e32 is penetrated along the thickness direction of the collecting terminal 10.

[0066] The thickness direction (corresponding to the Z direction in the figure) of the collection terminal 10 is roughly perpendicular to its extension direction and width direction. The collection terminal 10 is roughly in the shape of a thin sheet, and its size in the thickness direction is the smallest. The cutout e31 is set on one side or both sides in the width direction of the weak area e3, and can be triangular, arc-shaped, rectangular or other special shapes. The hollow hole e32 can be a round hole, a square hole, a straight bar hole, a zigzag bar hole (such as an S shape), or other shapes. When the hollow hole e32 is a bar hole, it roughly extends from one end to the other end in the width direction of the weak area e3.

[0067] 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, and this implementation method has a simple structure and is easy to process.

[0068] Generally, the thickness of the connecting rib 12e is consistent at all places. 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 obtain 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 entity 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 a 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.

[0069] In some embodiments, reference Figures 2 to 7 The inner wall of the notch d1 includes an arc-shaped wall d11 that is recessed in an arc shape along the width direction of the collecting terminal 10. That is, the notch d1 is roughly in an arc shape. The arc-shaped wall d11 of the notch d1 is easy to disperse stress, avoid stress concentration, improve the tensile strength of the connecting film 12d, and is not easy to break.

[0070] Further in the embodiment, the inner wall of the notch d1 further includes a transverse wall d12, which is connected to one end of the arc-shaped wall d11 and extends longitudinally away from the arc-shaped wall d11 along the width direction of the collection terminal 10, and the transverse wall d12 is 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.

[0071] The transverse wall d12 is a straight wall structure and extends along the width direction of the collection terminal 10. The part of the insulating film 12 covering the collection foil 11c is called the collection film 12g. In some embodiments, as Figures 2 to 7 shown, in order to reduce the consumption of the collection film 12g and simplify the processing and production, the collection film 12g only covers one end of the collection foil 11c close to the connection foil 11b. At this time, the inner wall of the notch d1 close to one end of the collection foil 11c is set as a straight wall structure instead of an arc structure. On the basis of not expanding the size of the collection film 12g in the extending direction of the collection terminal 10, the design of the straight wall structure can increase the design area of the collection film 12g, improve the strength of the collection film 12g and the covering ability of the collection foil 11c.

[0072] In some embodiments, referring to Figures 2 to 7 , the connection foil 11b includes a fuse b1. In the extending direction of the collection terminal 10, the fuse b1 is located within the range where the notch d1 is located.

[0073] The fuse b1 is in the shape of a filament extending in a curve and can melt when the current is too large to protect the battery cell. That the fuse b1 is located within the range where the notch d1 is located in the extending direction of the collection terminal 10 means that along the width direction of the collection terminal 10, the projection of the fuse b1 is located within the projection range of the notch d1.

[0074] The fuse b1 occupies a small area, and the width of the connection film 12d covering the fuse b1 can be set small, so that a larger range of the notch d1 can be formed and the deformation ability of the connection film 12d can be improved.

[0075] In some embodiments, referring to Figures 2 to 7 , the connection foil 11b further includes a connection part b2. The connection part b2 is at least connected to one end of the fuse b1 to connect the fuse b1 and the welding foil 11a or connect the fuse b1 and the collection foil 11c, and make the fuse b1 located within the range where the notch d1 is located. Among them, the width of the connection part b2 increases in the direction away from the fuse b1.

[0076] In Figures 2 to 7 the shown embodiment, connection parts b2 are arranged at both ends of the fuse b1. In other embodiments, a connection part b2 is arranged between the fuse b1 and the collection foil 11c, or a connection part b2 is arranged between the fuse b1 and the welding foil 11a. The width of the connection part b2 refers to the dimension in the width direction of the collection terminal 10, that is, the dimension in the Y direction.

[0077] On the one hand, when the size of the connecting foil 11b in the extending direction of the collecting terminal 10 remains unchanged, the setting of the connecting portion b2 can reduce the set length of the fuse b1 and avoid the fuse b1 being too long. The resistance of the fuse b1 is proportional to its length. An increase in length will cause an increase in its resistance, an increase in the voltage drop across the fuse b1, and a decrease in the actual operating voltage of other components in the circuit, which is not conducive to the normal operation of the circuit. Moreover, the longer the length of the fuse b1, the greater the power loss of the fuse b1 itself, and the greater the energy required for fusing, resulting in the fuse b1 being unable to fuse in time. At this time, occupying a certain length of the connecting foil 11b by the connecting portion b2 is beneficial to shortening the set length of the fuse b1.

[0078] On the other hand, the width of the connecting portion b2 is set to increase away from the fuse b1. This not only adapts to the arc-shaped extending notch d1 on the inner wall but also can enhance the connection strength at the connection between the connecting foil 11b and the collecting foil 11c or at the connection between the connecting foil 11b and the welding foil 11a, reducing the risk of the connection being broken during pulling.

[0079] In addition, when the distance between the bus bar 200 and the collecting main path 20 is short, a fuse b1 is provided at the connecting foil 11b and there are multiple straight connecting ribs 12e, which not only makes efficient use of space but also reduces the line impedance.

[0080] It should be noted that the fuse b1 is arranged within the range where the notch d1 of the connecting film 12d is located, and the fuse b1 is arranged between two opposite arc-shaped walls d11. Multiple connecting ribs 12e are arranged in the notch d1. Through the multiple connecting ribs 12e, the warping of the fuse b1 is prevented, and the risk of increased contact resistance due to loose contact of other connecting components is avoided. At the same time, warping will change the structural stress distribution, making it more likely to deform or be damaged. Through the above design, damage to the fuse b1 can be avoided, and the overall reliability can be improved.

[0081] Figure 11 It is a schematic structural diagram of the insulating film 12 in some embodiments.

[0082] In some embodiments, referring to Figure 11 , the insulating film 12 includes a welding film 12f and a collecting film 12g. The welding film 12f covers the welding foil 11a, and the collecting film 12g wraps the collecting foil 11c. The welding film 12f, the connecting ribs 12e, the connecting film 12d, and the collecting film 12g are integrally connected.

[0083] Furthermore, referring to Figure 11 , and in combination 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 collecting terminal 10, and each hollow window f1 exposes the welding foil 11a.

[0084] The exposed part of the welding foil 11a by each hollow window f1 is the welding position a1, and the welding foil 11a is welded to the main collection path 20 through the welding position a1. In practical applications, the main collection path 20 is welded to a plurality of collection terminals 10. The welding foils 11a of each collection terminal 10 can be welded to the welding area of the main collection path 20 by selecting one of the welding positions a1. Different collection terminals 10 can select welding positions a1 at different positions to be welded to the welding area of the main collection path 20. In this way, each collection terminal 10 can be mass-produced with a unified specification, reducing costs.

[0085] 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, preventing the edge of the welding foil 11a from being exposed by the hollow window f1, which helps to improve the tensile strength of the welding foil 11a and prevent the welding foil 11a from warping.

[0086] In some embodiments, referring to Figures 2 to 7 a solder hole a2 is provided at the welding position a1, and solder flows into the space between each welding position a1 and the welding area of the main collection path 20 through the solder hole a2 to realize the welding between each welding position a1 and the welding area of the main collection path 20. And there is solder remaining in the solder hole a2, which can strengthen the welding strength between the welding position a1 and the welding area. A plurality of solder holes a2 are provided at each welding position a1, which not only improves the welding efficiency but also further improves the welding strength.

[0087] In some embodiments, referring to Figures 2 to 7 a collection film 12g covers one end where the collection foil 11c is connected to the connection foil 11b. The part of the collection foil 11c not covered by the collection film 12g is used to be directly or indirectly electrically connected to the pole column of the battery cell to collect the voltage information of the battery cell. At this time, the collection film 12g only covers one end of the collection foil 11c, which can greatly reduce the consumption of the insulating film 12 and simplify the manufacturing process of the collection terminal 10.

[0088] In a specific embodiment of the present application, the collection terminals 10 are symmetrically arranged. A first connecting rib e1 and a second connecting rib e2 are provided in each notch d1. 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 film 12d. Weak areas e3 are provided on both the first connecting rib e1 and the second connecting rib e2, and cutouts e31 are formed on both sides of the weak area e3.

[0089] 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 film 12d. The first connecting rib e1 is provided with a weak area e3, and cutouts e31 are formed on both sides of the weak area e3, while the second connecting rib e2 is not provided with a weak area e3. In this way, when the first connecting rib e1 breaks preferentially, the strength of the second connecting rib e2 is improved, and the protection effect on the fuse b1 is enhanced.

[0090] As long as the solutions of the above embodiments do not conflict, more embodiments can be freely combined.

[0091] In addition, the battery proposed in the embodiments of the present application includes a battery cell, a bus bar 200, and the acquisition component 100 in any of the above embodiments. The bus bar 200 is connected to the pole of the battery cell. The acquisition foil 11c is connected to the bus bar 200.

[0092] The bus bar 200 is a conductive component (such as a copper bar or an aluminum bar), which is electrically connected to the pole of the battery cell. Specifically, the acquisition foil 11c and the bus bar 200 are ultrasonically welded. The bus bar 200 and the pole are welded.

[0093] Figure 12 It is a schematic structural diagram of the bus bar 200 in some embodiments.

[0094] In a specific embodiment, in combination with Figure 12 Understand that the opposite ends of the bus bar 200 are respectively connected to the poles of different battery cells. A concave rib 201 is provided in the middle area of the bus bar 200 between the opposite ends. The concave rib 201 is recessed along the thickness direction of the bus bar 200. The inner wall and the outer wall of the concave rib 201 are in matching shapes, and the cross-sectional length of the concave rib 201 is L0. Among the notches d1, the hollow area d2 formed by the outermost connecting rib 12e is the first hollow area d21, and the maximum dimension of the first hollow area d21 in the width direction of the acquisition terminal 10 is L1, satisfying L1≥L0 / 2.

[0095] It should be noted that N battery cells are arranged side by side to form a battery cell group. The opposite ends of the bus bar 200 in the Y direction are respectively connected to the poles of adjacent battery cells. The concave rib 201 can be recessed toward the side where the battery cells are located or away from the side where the battery cells are located along the thickness direction of the bus bar 200. The inner wall and the outer wall of the concave rib 201 are in matching shapes, indicating that the thickness of the concave rib 201 is basically the same as the thickness of the rest of the bus bar 200. The concave rib 201 can be formed by stamping or other methods. The concave rib 201 extends in a strip shape along the X direction to both ends of the bus bar 200.

[0096] The cross section of the concave rib 201 is a cross section perpendicular to its extension direction, and its cross section length L0 can be understood as the length of the concave rib 201 in the Y direction after being straightened, and can also be understood as the extension length of its cross section shape.

[0097] The first hollow area d21 is formed by the outermost connecting rib 12e in the notch d1 and the inner connecting rib 12e adjacent thereto. The larger the maximum dimension L1 of the first hollow area d21 in the width direction of the collecting terminal 10, the larger the deformation space of the collecting terminal 10 after the outermost connecting rib 12e breaks, and the inner connecting rib 12e adjacent thereto is not easily broken.

[0098] When the battery cell group expands, the busbar 200 follows the battery cell to shift to the left or right in the Y direction, and the limit of the shift is the degree to which the concave rib 201 is flattened. In theory, the left and right unilateral offset distance of the busbar 200 evenly divides the length of the concave cross section, that is, the maximum unilateral offset of the busbar 200 is L0 / 2. At this time, L1 ≥ L0 / 2, when the battery cell undergoes the maximum expansion displacement to flatten the concave rib 201 of the busbar, the collection terminal 10 still deforms within the deformation range provided by the first hollow area d21, and will not damage the inner connecting rib 12e. In this way, the reliability of the collection terminal 10 is improved.

[0099] Figure 13 It is a partial schematic diagram of the collection terminal 10 in some embodiments.

[0100] 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 is 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 film 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 size 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.

[0101] Specifically, the expansion force F and expansion deformation L of the battery pack 膨It can be obtained through simulation by 3D simulation software (such as ANSYS, ABAQUS, etc.). The thickness t and the tensile strength σ are the thickness and the tensile strength of the insulating film 12. The thickness t is determined according to the production requirements, and the tensile strength σ is determined according to the material of the insulating film 12.

[0102] The expansion deformation amount L of the battery cell group 膨 Divided by the number of battery cells arranged side by side is the expansion deformation amount M of a single battery cell. L1 is the maximum dimension of the first hollow area d21 in the Y direction, which is determined by the solution in the above embodiment. M1 is the maximum offset that the acquisition terminal 10 can generate after the first connecting rib e1 breaks, and M1 is equal to L1. M2 is the maximum offset that the acquisition terminal 10 can generate after the second connecting rib e2 breaks, and M2 is equal to M.

[0103] The distances from the center of the first weak area and the center of the second weak area to the end of the acquisition foil 11c away from the connection foil 11b are both S, and S is a design value. The center of the weak area e3 is its geometric center. Specifically, if the weak area e3 is designed by setting a notch e31 on the connecting rib 12e, the center of the weak area e3 is located at the center position of the minimum width of the notch e31. If the weak area e3 is designed by setting a notch e31 and a hollow hole e32 on the connecting rib 12e, the center of the weak area e3 is the center of the part pointed to by the dimension D 01 The center of the part pointed to by the dimension D 02 The center position of the center line of the part pointed to.

[0104] Under the action of the expansion force F of the battery cell group, when the first weak area breaks, the offset angle θ1 generated by the acquisition terminal 10 is arctan(M1 / S), then the tensile force F1 received by the first weak area can be determined as F1 = Fcosθ1; when the second weak area breaks, the offset angle θ2 generated by the acquisition terminal 10 is arctan(M2 / S), then the tensile force F2 received by the second weak area can be determined as F2 = Fcosθ2.

[0105] After determining F1 and F2, according to D1 = F1 / (σt) and D2 = F2 / (σt) to determine the width D1 of the first weak area and the width D2 of the second weak area, so as to determine the structures of the first weak area and the second weak area.

[0106] In a specific embodiment, the width D1 of the first weak area is less than the width D2 of the second weak area. In this way, the first connecting rib e1 can be made to break prior to the second connecting rib e2, and the strength of the second connecting rib e2 can be relatively increased, taking into account practicality and reliability. In a specific embodiment, the distances from the center of the first weak area and the center of the second weak area to the end of the acquisition foil 11c away from the connection foil 11b are S1 and S2 respectively, where S1 ≠ S2, so that when the first connecting rib e1 and the second connecting rib e2 break simultaneously, the breaking positions are different, further avoiding the warping of the connection film 12d and the fuse b1.

[0107] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0108] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A collection component, characterized in that, Comprising: A collection terminal (10), including a metal foil (11) and an insulating film (12), wherein 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); And A collection main path (20), including 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 extension direction of the collection terminal (10) of the collection main path (20); Wherein, the insulating film (12) includes a connecting film (12d) and connecting ribs (12e), the connecting film (12d) covers the connecting foil (11b), and notches (d1) recessed along the width direction of the collection terminal (10) are formed on both opposite sides of the connecting film (12d); Each notch (d1) is provided with n connecting ribs (12e), both ends of each connecting rib (12e) in the extension direction of the collection terminal (10) are connected to the inner wall of the notch (d1) where it is located, and all the connecting ribs (12e) are sequentially spaced along the width direction of the collection terminal (10) and divide the notch (d1) where they are located into n hollow areas (d2), n≥2, and at least the outermost connecting rib (12e) is provided with a weak area (e3), and the minimum cross-section of the connecting rib (12e) is located in the weak area (e3).

2. The acquisition component according to claim 1, characterized in that At least part of the connecting ribs (12e) longitudinally extend in a straight strip shape along the extension direction of the collection terminal (10); and / or, Part of the connecting ribs (12e) bend and extend in the extension direction of the collection terminal (10).

3. The acquisition 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 dimension of the hollow area (d2) in the width direction of the collection terminal (10).

4. The acquisition component according to claim 1, wherein Each connecting rib (12e) in each notch (d1) is provided with the weak area (e3), and in the same notch (d1), the closer to the outside of the connecting film (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 acquisition component according to claim 1, wherein A cut (e31) and / or a hollow hole (e32) are formed on the connecting rib (12e) where the weak area (e3) is located, the cut (e31) is recessed along the width direction of the collection terminal (10), and the hollow hole (e32) penetrates along the thickness direction of the collection terminal (10).

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

7. The acquisition component according to claim 6, characterized in that, The inner wall of the notch (d1) further includes a transverse wall (d12). The transverse wall (d12) is connected to one end of the arc wall (d11) and extends longitudinally away from the arc wall (d11) along the width direction of the acquisition terminal (10). The transverse wall (d12) is located at one end of the connection film (12d) close to the acquisition 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 wall (d11).

8. The acquisition component according to any one of claims 1 to 5, characterized in that, The connection foil (11b) includes a fuse (b1). In the extending direction of the acquisition terminal (10), the fuse (b1) is located within the range of the notch (d1).

9. A battery, characterized in that, Comprising: a battery cell; a busbar (200) connected to the pole of the battery cell; and the acquisition component as described in claim 8, wherein the acquisition foil (11c) is connected to the busbar (200).

10. The battery according to claim 9, characterized in that, The opposite ends of the busbar (200) are respectively connected to the poles of different battery cells; A concave rib (201) is provided in the middle area between the opposite ends of the busbar (200). The concave rib (201) is recessed along the thickness direction of the busbar (200). The inner wall and the outer wall of the concave rib (201) are in matching shapes. 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 the first hollow area (d21). The maximum dimension of the first hollow area (d21) in the width direction of the acquisition terminal (10) is L1, satisfying: L1≥L0 / 2.

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