Collecting assembly, battery and electric device

Abstract

The application relates to a collecting assembly, a battery and a power utilization device. The collecting assembly comprises a sampling main path and a sampling branch. The sampling branch comprises a metal foil and an insulating film. The metal foil is divided into a welding foil, a connecting foil and a sampling foil along the extension direction of the sampling branch. The welding foil is welded with the sampling main path. The insulating film comprises a connecting film covering the connecting foil. The connecting film is formed with notches on both sides in the width direction of the sampling branch. Each notch is open outward along the width direction. The insulating film further comprises a connecting rib. Each notch is provided with the connecting rib. The connecting rib is connected to the opposite sides of the notch along the extension direction and forms a hollow area together with the connecting film. The technical scheme of the application can reduce the risk of the breakage and falling of the sampling branch caused by the tension of both ends of the sampling branch due to the expansion displacement of the battery cell and can improve the welding quality of the sampling branch.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to data acquisition components, batteries and power devices. Background Technology

[0002] A battery is composed of multiple cells connected in series and parallel. The battery uses a data acquisition module to collect operating data such as voltage and temperature from each cell. The acquisition module includes a main acquisition path and sampling branches; the sampling branches are mostly welded to the cells and the main acquisition path. After prolonged charging and discharging, adjacent cells expand and deform, causing changes in the relative position of the main acquisition path and the cells. The sampling branches are also prone to tearing and detachment due to stretching.

[0003] In related technologies, a buffer section is set within the sampling branch, and the deformation of the buffer section is used to accommodate the expansion of the battery cell. During the production process, when the sampling branch is welded to the battery cell and the main acquisition circuit, the buffer section is easily deformed by slight external forces, which can change the welding position, causing poor welding and affecting battery performance. Utility Model Content

[0004] Therefore, it is necessary to provide a data acquisition component, battery, and power supply device to address the problem of the sampling branches of the data acquisition component being torn or detached due to cell expansion.

[0005] Firstly, this application provides a data acquisition component, including:

[0006] Sampling main path; and

[0007] The sampling branch includes a metal foil and an insulating film. The metal foil is divided into a welding foil, a connecting foil, and a sampling foil along the extension direction of the sampling branch. The welding foil is welded to the main sampling path. The insulating film includes a connecting film covering the connecting foil.

[0008] The connecting membrane has notches on both sides of the sampling branch in the width direction, and each notch is open outward along the width direction;

[0009] The insulating film also includes connecting ribs, and each of the notches is provided with a connecting rib. The connecting ribs are connected to the opposite sides of the notch along the extending direction and surround the connecting film to form a hollow area.

[0010] In some embodiments, a weak zone is provided on the connecting rib, and the minimum cross-section of the connecting rib is located in the weak zone.

[0011] In some embodiments, the projections of the two notches in the thickness direction of the sampling branch are symmetrically arranged relative to the direction parallel to the extension direction.

[0012] In some embodiments, the width w of the weak zone satisfies: 0.15mm ≤ w ≤ 5mm.

[0013] In some embodiments, each of the notches is recessed in an arc shape opposite to the corresponding connecting rib.

[0014] In some embodiments, the notch includes an arc-shaped wall and a first straight wall forming the hollow area, and the connecting rib includes a second straight wall forming the hollow area, wherein the arc-shaped wall, the first straight wall and the second straight wall are connected end to end in sequence;

[0015] The first straight wall extends along the width direction, and the arc-shaped wall is recessed away from the second straight wall; the first straight wall is located at the end of the notch near the sampling foil.

[0016] In some embodiments, a weak area is provided on the connecting rib, the weak area being located at the end of the connecting rib connected to the first straight wall; a cut is provided at the edge of the weak area facing away from the notch.

[0017] In some embodiments, the connecting foil includes a fuse;

[0018] In the extending direction, the fuse is located within the area of ​​the notch, or the connecting foil further includes a connecting portion connected at least to one end of the fuse to connect the fuse and the welding foil or to connect the fuse and the sampling foil, and such that the fuse is at least partially located within the area of ​​the notch, wherein the width of the connecting portion increases in the direction away from the fuse, or the fuse extends at least partially beyond the area of ​​the notch and is located close to the welding foil.

[0019] In some embodiments, the sampling main path is a flexible flat cable, and the welding foil is laser soldered to the flexible flat cable;

[0020] The insulating film also includes a welding film covering the welding foil, the welding film being integrally connected to the connecting film, the welding film having perforated windows, and a plurality of perforated windows being arranged at intervals along the extending direction, the perforated windows exposing the welding foil;

[0021] The insulating film also includes a sampling film covering a portion of the sampling foil. The sampling film covers the end of the sampling foil that is connected to the connecting foil to connect the connecting film.

[0022] Secondly, this application provides a battery, comprising:

[0023] Battery cell;

[0024] A busbar is connected to the terminal of the battery cell;

[0025] As described in any of the above embodiments, the sampling foil is ultrasonically welded to the busbar.

[0026] Thirdly, this application provides an electrical device including the battery described in the above embodiments, wherein the battery is used to provide electrical energy.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The aforementioned acquisition components, batteries, and power devices have notches on both sides of the connecting membrane of the acquisition components. The notches make the width of the connecting membrane smaller, reducing the area of ​​the insulating membrane. When the two ends of the sampling branch extend in its width direction, the restriction of the insulating membrane is reduced. In addition, the notches form a hollow area to avoid the deformation of the two ends of the sampling branch, reducing the risk of the two ends of the sampling branch being pulled and broken or falling off due to the expansion displacement of the battery cell.

[0029] Furthermore, the connecting ribs set within the gaps can position the connecting membrane, improving the structural stability of the connecting membrane when the sampling branch is welded to the main acquisition path or the sampling branch to the busbar, preventing micro-deformation of the connecting membrane during welding, and helping to improve welding quality. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, throughout the drawings, the same reference numerals denote the same elements. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the acquisition component in some embodiments.

[0032] Figure 2 This is a schematic diagram showing the connection between the acquisition component and the bus in some embodiments.

[0033] Figure 3 This is a schematic diagram of the sampling branch structure in some embodiments.

[0034] Figure 4 This is a schematic diagram of the sampling branch structure for some other embodiments.

[0035] The reference numerals in the detailed embodiments are as follows:

[0036] 100. Acquisition component; 10. Sampling main path; 11. Connecting terminal; 20. Sampling branch; X. Extension direction; Y. Width direction; 21. Metal foil; 21a. Welding foil; q. Welding area; h. Solder hole; 21b. Connecting foil; b2. Fuse; b3. Connecting part; 21c. Sampling foil; 22. Insulating film; 22a. Connecting film; a1. Notch; a11. Arc wall; a12. First straight wall; a2. Hollow area; a3. Weak area; a31. Cutout; 22b. Connecting rib; b1. Second straight wall; 22c. Welding film; c1. Hollow window; 22d. Sampling film; 200. Busbar. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the connection within two elements or the interaction between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0043] In response to the problems mentioned in the background art, this application provides a data acquisition component, a battery, and a power supply device.

[0044] The battery in this embodiment includes a battery cell. The battery cell can be a secondary battery or a primary battery, and can be a lithium-ion battery, sodium-ion battery, or magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0045] In one embodiment, the battery cell typically includes a top cover, a housing, and an electrode assembly. The housing and the top cover together form an internal space for accommodating the electrode assembly. Specifically, the housing may have a receiving cavity formed within it, with at least one end open. The top cover closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing. The battery cell includes terminals that are connected to tabs on the electrode assembly. Optionally, the terminals protrude from the top cover.

[0046] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the battery cell, allowing it to penetrate the electrode assembly and provide ion migration pathways for electrochemical reactions, as well as conductivity. Electrode assemblies can be in the form of wound, stacked, or other types. One or more electrode assemblies can be installed within the battery cell.

[0047] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections. A data acquisition module connects the battery cells and the battery management system, collecting information such as temperature and voltage from the battery cells and transmitting it to the battery management system so that the battery management system can control and monitor the operating status of each battery cell. Alternatively, multiple battery cells can be combined with a data acquisition module and a module management system to form a battery module. Multiple battery modules can then be electrically connected in series, parallel, or a combination of series and parallel connections, together with the battery management system, to form a battery pack.

[0048] The battery in this embodiment can be applied to an electrical device to provide power to it. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, etc. Taking a vehicle as an example, the battery can be located at the rear, front, or bottom of the vehicle. The battery can provide power for the vehicle's drive and also for its control system.

[0049] The acquisition components in the embodiments of this application are described below.

[0050] Please refer to Figure 1 , Figure 2 and Figure 3 The acquisition component 100 in this embodiment includes a sampling main path 10 and a sampling branch 20. The sampling branch 20 includes a metal foil 21 and an insulating film 22. The metal foil 21 is divided into a welding foil 21a, a connecting foil 21b, and a sampling foil 21c along the extension direction X of the sampling branch 20. The welding foil 21a is welded to the sampling main path 10. The insulating film 22 includes a connecting film 22a covering the connecting foil 21b. The connecting film 22a has notches a1 on both sides in the width direction Y of the sampling branch 20, and each notch a1 is open outward along the width direction Y. The insulating film 22 also includes connecting ribs 22b. Each notch a1 has a connecting rib 22b, which is connected to the opposite sides of the notch a1 along the extension direction X and surrounds the connecting film 22a to form a hollow area a2.

[0051] The sampling main path 10 has a connection terminal 11, which is used for connection to the aforementioned battery management system or module management system. The sampling main path 10 can be a flat flexible cable, a flexible circuit board, etc. In practical applications, multiple battery cells are arranged side by side to form a cell group. The sampling main path 10 extends longitudinally along the side-by-side direction of the cell group. At least one sampling branch 20 is provided on one side of the sampling main path 10 in the width direction Y. Multiple sampling branches 20 are arranged sequentially along the longitudinal direction of the sampling main path 10.

[0052] The sampling branch 20 includes an inner metal foil 21 and an outer insulating film 22. The insulating film 22 covers the metal foil 21 to electrically isolate it. The metal foil 21 includes a solder foil 21a, which is used to solder to the sampling main circuit 10. The soldering method can be laser soldering. The insulating film 22 covers a portion of the solder foil 21a, and the uncovered portion of the solder foil 21a is soldered to the sampling main circuit 10. The metal foil 21 also includes a sampling foil 21c, which is used to connect to the busbar 200 to collect the temperature / voltage information of the battery cell. The busbar 200 is a conductive component (such as a copper busbar or aluminum busbar) that is electrically connected to the terminal of the battery cell. The insulating film 22 covers a portion of the sampling foil 21c, and the exposed sampling foil 21c is used to make a conductive connection with the busbar 200 to collect the voltage of the battery cell. Of course, the insulating film 22 can also completely cover the sampling foil 21c. A thermistor is set on the sampling foil 21c. The sampling foil 21c is thermally connected to the busbar 200 by means of adhesive or other methods. The thermistor senses the temperature of the busbar 200 and converts it into an electrical signal, which is then transmitted to the sampling main circuit 10. The metal foil 21 includes a connecting foil 21b, which is integrally connected between the welding foil 21a and the sampling foil 21c along the extension direction X of the sampling branch 20. The connecting foil 21b is covered with a connecting film 22a. The welding foil 21a, the connecting foil 21b, and the sampling foil 21c are integrally connected.

[0053] The connecting membrane 22a forms notches a1 on both sides in the width direction Y of the sampling branch 20, with the two notches a1 opening opposite each other along the width direction Y. A connecting rib 22b is provided within each notch a1. The connecting rib 22b is part of the insulating membrane 22 and is typically integrally connected to the connecting membrane 22a, the welding membrane 22c, and the sampling membrane 22d. The connecting rib 22b is generally strip-shaped along the extension direction X of the sampling branch 20, with both ends connected to the inner wall of the notch a1, closing the open end of the notch a1 to form the aforementioned hollow area a2. On the one hand, when the battery cell expands or is subjected to external impact or compression, the notches a1 in the hollow area a2 can absorb some of the external force, preventing the external force from acting directly on the sampling branch 20 and reducing the possibility of the sampling branch 20 breaking due to mechanical damage. On the other hand, heat is generated during the operation of the battery cell, especially at the terminals and busbars 200, where the temperature is significantly higher than at other locations. The sampling branch 20 is located at the terminals and busbars 200, and the hollow area a2 helps dissipate heat. If the sampling branch 20 is always in a high-temperature environment, it will affect its performance and lifespan. By designing the hollow area a2, the local heat dissipation environment of the acquisition component 100 can be improved, which can reduce the operating temperature of the sampling branch 20 and keep it working within a relatively stable temperature range.

[0054] When the acquisition component 100 is applied to the battery cell assembly, the expansion force of the battery cell has a large component force in the width direction Y of the sampling branch 20. Under the action of this component force, the battery cell and the sampling main path 10 are prone to displacement in the width direction Y of the sampling branch 20.

[0055] Because the connecting film 22a of the acquisition component 100 has notches a1 on both sides in the width direction Y, the setting of notches a1 makes the width of the connecting film 22a smaller, reducing the usable area of ​​the insulating film 22. When the two ends of the sampling branch 20 in the extension direction X are offset in the width direction Y, the restriction of the insulating film 22 is reduced. In addition, the notches a1 form a hollow area a2 to avoid the offset deformation of the two ends of the sampling branch 20, reducing the risk of the two ends of the sampling branch 20 being pulled and broken or falling off due to the expansion displacement of the battery cell.

[0056] Furthermore, the connecting rib 22b is provided in the notch a1. The connecting rib 22b can play a positioning role for the connecting membrane 22a. When the sampling branch 20 is welded to the main acquisition path or the sampling branch 20 is welded to the busbar 200, the structural stability of the connecting membrane 22a is improved, and the micro-deformation of the connecting membrane 22a during welding is avoided, which helps to improve the welding quality.

[0057] The connection membrane 22a should be configured to not interfere with or minimally interfere with the deformation of the connection membrane 22a. Alternatively, by setting the width of the connecting rib 22b to be smaller and the width of the connection membrane 22a to be larger, the connecting rib 22b will break first when the sampling branch 20 is stretched, without interfering with the deformation of the connection membrane 22a.

[0058] In some embodiments, refer to Figure 3 and Figure 4 A weak zone a3 is provided on the connecting bar 22b, and the minimum cross-section of the connecting bar 22b is located in the weak zone a3.

[0059] The cross-section of the connecting rib 22b is perpendicular to its extension direction, which is approximately parallel to the extension direction X of the sampling branch 20. The cross-section of the connecting rib 22b is the smallest in the weak zone a3, resulting in low stiffness in the weak zone a3. Consequently, the connecting rib 22b has low tensile strength and is prone to breakage at the location of the weak zone a3.

[0060] Specifically, the width of the weak zone a3 can be minimized. For example, the width of the connecting rib 22b gradually decreases from both ends towards the weak zone a3. Alternatively, a notch a31 can be provided at the edge of the weak zone a3 to reduce its width. The notch a31 can be arc-shaped, triangular, rectangular, etc. Furthermore, the weak zone a3 can have a hole structure to reduce its width. The hole structure can be circular, rectangular, S-shaped, straight, cross-shaped, etc.

[0061] At this point, a weak zone a3 is set on the connecting rib 22b, making the connecting rib 22b more susceptible to breakage. When a large external force occurs, the weak zone a3 on the connecting rib 22b breaks first, thus protecting the sampling branch 20. In this way, the relationship between the width of the connecting rib 22b and the width of the connecting membrane 22a can be disregarded, allowing for greater design flexibility. Furthermore, the cross-section of the area of ​​the connecting rib 22b other than the weak zone a3 can be designed to be larger, which helps to improve the connection strength of the connecting rib 22b and enhance the positional stability of the connecting membrane 22a during the welding process.

[0062] Specifically, the weak zone a3 can be set at the end of the connecting rib 22b near the sampling foil 21c, or at the end of the connecting rib 22b near the welding foil 21a, or in the middle of the connecting rib 22b.

[0063] In some embodiments, the projections of the two notches a1 onto the thickness direction of the sampling branch 20 are symmetrically arranged relative to the direction of the parallel extension direction X.

[0064] Sampling branch 20 is roughly sheet-like, with its smallest dimension in the thickness direction. Sampling branch 20 is typically connected to the main sampling path 10 and the busbar 200 along the thickness direction. The center of symmetry of the two notches a1 coincides with the center of sampling branch 20.

[0065] At this point, the two notches a1 are symmetrically positioned relative to the center of the sampling branch 20, and the deformation capacity of both sides of the sampling branch 20 in the width direction Y is consistent. The symmetrical notch shape allows the connecting ribs 22b on both sides to form a symmetrical stress flow distribution when under stress, dispersing the maximum principal stress to the weak area a3 of the connecting ribs 22b. Simultaneously, it avoids the generation of torque due to asymmetrical deformation, preventing the fuse b2 from being broken, thus improving circuit safety and reliability.

[0066] In some embodiments, refer to Figure 3 The width w of the weak zone a3 satisfies: 0.15mm≤w≤5mm.

[0067] The width w of the weak region a3 refers to the minimum dimension in the width direction Y of the sampling branch 20. Specifically, w can be selected as 0.15mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, and any value between any adjacent selections.

[0068] When the width w is within the above range, the weak area a3 is not only prone to breakage, but the stiffness of the connecting rib 22b is also moderate, which can take into account the positioning effect of the connecting rib 22b on the connecting membrane 22a. At the same time, when the weak area a3 is prepared by FDC die-cutting technology, the weak area a3 can be easily obtained without being affected by the die precision.

[0069] In some embodiments, refer to Figure 3 and Figure 4 Each notch a1 is concave in an arc shape, facing away from the corresponding connecting rib 22b. The arc-shaped structure easily disperses stress, avoids stress concentration, improves the tensile strength of the connecting membrane 22a, and makes it less prone to breakage.

[0070] In a further embodiment, the notch a1 includes an arc-shaped wall a11 and a first straight wall a12 forming the hollow area a2, and the connecting rib 22b includes a second straight wall b1 forming the hollow area a2. The arc-shaped wall a11, the first straight wall a12, and the second straight wall b1 are connected end to end in sequence. The first straight wall a12 extends along the width direction Y, and the arc-shaped wall a11 is recessed away from the second straight wall b1. The first straight wall a12 is located at the end of the notch a1 near the sampling foil 21c.

[0071] In some designs, such as Figure 3 As shown, the sampling membrane 22d only covers the end of the sampling foil 21c near the connecting foil 21b. At this time, the inner wall of the notch a1 near the end of the sampling foil 21c is provided with a straight wall structure instead of an arc structure. Without increasing the size of the sampling membrane 22d in the above-mentioned extension direction X, the design of the straight wall structure can increase the design area of ​​the sampling membrane 22d, improve the strength of the sampling membrane 22d and its ability to cover the sampling foil 21c.

[0072] Further in the embodiments, refer to Figure 3 and Figure 4 The connecting rib 22b is provided with the aforementioned weak area a3, which is located at the end of the connecting rib 22b that is connected to the first straight wall a12.

[0073] At this time, when the sampling branch 20 is stretched, the tension on the connecting membrane 22a can be transmitted along the first straight wall a12 to the weak area a3, and stress concentration occurs in the weak area a3, making it more prone to breakage.

[0074] Furthermore, a notch a31 is provided at the edge of the weak area a3 facing away from the gap a1. The cutting direction of notch a31 is set along the width direction of the sampling branch 20 towards the outside of the gap a1, so that the cutting direction of notch a31 is basically consistent with the direction of the external force on the sampling branch 20. When the sampling branch 20 is subjected to external force (mainly force in the width direction of the sampling branch), the notch a31 at the edge of the weak area a3 facing away from the gap a1 can further promote stress concentration, guiding the connecting rib 22b to preferentially break or tear at the notch a31 along the cutting direction of notch a31, avoiding the sampling branch 20 from wrinkling and causing fuse breakage, insulation film damage, etc., thus improving overall safety.

[0075] In some embodiments, refer to Figure 3 The connecting foil 21b includes a fuse b2, which is located within the area of ​​the notch a1 in the extension direction X of the sampling branch 20.

[0076] Fuse b2 is a curved, thin wire that can melt and protect the battery cell when the current is too high. The fact that fuse b2 is located within the area of ​​notch a1 in the extension direction X means that the projection of fuse b2 along the width direction Y of sampling branch 20 lies within the projection range of notch a1.

[0077] Since the fuse b2 occupies a small area, the width of the connecting film 22a covering the fuse b2 can be set to be small, thus forming a larger gap a1 range and improving the deformation capability of the connecting film 22a.

[0078] In some embodiments, the connecting foil 21b further includes a connecting portion b3, which is at least connected to one end of the fuse b2 to connect the fuse b2 and the welding foil 21a or to connect the fuse b2 and the sampling foil 21c, and to place the fuse b2 at least partially within the area of ​​the notch a1. The width of the connecting portion b3 increases in the direction away from the fuse b2.

[0079] exist Figure 3In the illustrated embodiment, both ends of the fuse b2 are provided with connecting portions b3. In other embodiments, the connecting portion b3 is provided between the fuse b2 and the sampling foil 21c, or between the fuse b2 and the soldering foil 21a. The width of the connecting portion b3 refers to its dimension in the width direction Y of the sampling branch 20.

[0080] On the one hand, when the dimensions of the connecting foil 21b are the same in the aforementioned extension direction X, the arrangement of the connecting part b3 can reduce the length of the fuse b2, preventing the fuse b2 from becoming too long. The resistance of the fuse b2 is proportional to its length; increasing the length leads to an increase in its resistance, resulting in a larger voltage drop across the fuse b2. This causes a decrease in the actual operating voltage of other components in the circuit, which is detrimental to the normal operation of the circuit. Moreover, the longer the fuse b2 is, the greater its own energy loss and the greater the energy required for melting, causing the fuse b2 to fail to melt in time. In this case, by using the connecting part b3 to occupy a certain length of the connecting foil 21b, it is beneficial to shorten the length of the fuse b2.

[0081] On the other hand, the width of the connecting part b3 is set to increase away from the fuse b2, which not only adapts to the arc-shaped notch a1 on the inner wall, but also enhances the connection strength at the connection between the connecting foil 21b and the sampling foil 21c or the connection between the connecting foil 21b and the welding foil 21a, reducing the risk of the connection being broken during the pulling process.

[0082] In other embodiments, such as Figure 4 As shown, in the aforementioned extending direction X, the fuse b2 is at least partially located outside the area where the notch a1 is located, and is positioned close to the welding foil 21a. Thus, the width of the connecting film 22a covering the fuse b2 is relatively large, allowing the insulating film 22 to better protect the fuse b2.

[0083] In some embodiments, the sampling main path 10 is a flexible flat cable, and the welding foil 21a is laser soldered to the flexible flat cable. Flexible flat cables (FFCs) are less expensive to manufacture and more environmentally friendly than flexible printed circuit boards (FPCs). Compared to traditional soldering processes, laser soldering offers advantages such as non-contact soldering, no static electricity, and real-time quality control, ensuring the soldering quality between the welding foil 21a and the sampling main path 10.

[0084] In some embodiments, refer to Figure 3 and Figure 4 The insulating film 22 also includes a welding film 22c covering the welding foil 21a. The welding film 22c is integrally connected with the connecting film 22a. The welding film 22c is provided with a perforated window c1. Multiple perforated windows c1 are arranged at intervals along the aforementioned extension direction X. The perforated windows c1 expose the welding foil 21a.

[0085] The exposed portion of the welding foil 21a by each cutout window c1 is the welding area q, and the welding foil 21a is welded to the sampling main path 10 through the welding area q.

[0086] In practical applications, the main sampling path 10 can be welded to multiple sampling branches 20. The welding foil 21a of each sampling branch 20 can be welded to the main sampling path 10 by selecting one of the welding areas q. Different sampling branches 20 can be welded to the main sampling path 10 using welding areas q at different positions. In this way, all sampling branches 20 can be mass-produced to uniform specifications, reducing costs.

[0087] Preferably, each perforated window c1 does not exceed the range of the welding foil 21a, ensuring that the welding foil 21a near each perforated window c1 is covered and fixed by the welding film 22c, avoiding the edge of the welding foil 21a being exposed by the perforated window c1, which helps to improve the tensile strength of the welding foil 21a and prevent the welding foil 21a from warping.

[0088] Preferably, refer to Figure 3 and Figure 4 Solder holes h are provided on the welding areas q. Solder flows into each welding area q and the sampling main path 10 through the solder holes h to achieve welding between each welding area q and the sampling main path 10. Solder is retained in the solder holes h, which can enhance the welding strength between the welding area q and the sampling main path 10. Setting multiple solder holes h on each welding area q not only improves welding efficiency but also further enhances welding strength.

[0089] In some embodiments, the insulating film 22 further includes a sampling film 22d covering a portion of the sampling foil 21c. The sampling film 22d covers the end of the sampling foil 21c that is connected to the connecting foil 21b, so as to connect the connecting film 22a.

[0090] The portion of sampling foil 21c not covered by sampling film 22d is used to weld to busbar 200 to collect voltage information of the battery cell. In this case, sampling film 22d only covers one end of sampling foil 21c, which can greatly reduce the consumption of insulating film 22 and simplify the preparation process of sampling branch 20.

[0091] As long as the above embodiments do not conflict, they can be freely combined to obtain more embodiments.

[0092] In addition, the battery proposed in this application includes a battery cell, a busbar 200 and a collection component 100 of any of the above embodiments. The busbar 200 is connected to the terminal of the battery cell, and the sampling foil 21c is ultrasonically welded to the busbar 200.

[0093] In addition, this application embodiment also provides an electrical device, which includes the above-mentioned battery, and the battery is used to provide electrical energy.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0095] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A data acquisition component (100), characterized in that, include: Sampling main path (10); and The sampling branch (20) includes a metal foil (21) and an insulating film (22). The metal foil (21) is divided into a welding foil (21a), a connecting foil (21b), and a sampling foil (21c) along the extension direction (X) of the sampling branch (20). The welding foil (21a) is welded to the sampling main path (10). The insulating film (22) includes a connecting film (22a) covering the connecting foil (21b). The connecting membrane (22a) has notches (a1) formed on both sides of the sampling branch (20) in the width direction (Y), and each notch (a1) is open outward along the width direction (Y); The insulating film (22) further includes connecting ribs (22b), and each notch (a1) is provided with a connecting rib (22b). The connecting ribs (22b) are connected to the opposite sides of the notch (a1) along the extension direction (X) and surround the connecting film (22a) to form a hollow area (a2).

2. The acquisition component (100) according to claim 1, characterized in that, A weak zone (a3) ​​is provided on the connecting rib (22b), and the minimum cross-section of the connecting rib (22b) is located in the weak zone (a3); And / or, the projections of the two notches (a1) in the thickness direction of the sampling branch (20) are symmetrically arranged relative to the direction parallel to the extension direction (X).

3. The acquisition component (100) according to claim 2, characterized in that, The width w of the weak area (a3) ​​satisfies: 0.15mm≤w≤5mm.

4. The acquisition component (100) according to any one of claims 1-3, characterized in that, Each of the notches (a1) is concave in an arc shape away from the corresponding connecting rib (22b).

5. The acquisition component (100) according to claim 4, characterized in that, The notch (a1) includes an arc-shaped wall (a11) and a first straight wall (a12) forming the hollow area (a2), and the connecting rib (22b) includes a second straight wall (b1) forming the hollow area (a2). The arc-shaped wall (a11), the first straight wall (a12) and the second straight wall (b1) are connected end to end in sequence. The first straight wall (a12) extends along the width direction (Y), and the arc-shaped wall (a11) is recessed away from the second straight wall (b1); the first straight wall (a12) is located at the end of the notch (a1) near the sampling foil (21c).

6. The acquisition component (100) according to claim 5, characterized in that, A weak area (a3) ​​is provided on the connecting rib (22b), and the weak area (a3) ​​is located at the end of the connecting rib (22b) that is connected to the first straight wall (a12); The weak area (a3) ​​has a cut (a31) on its edge opposite to the gap (a1).

7. The acquisition component (100) according to any one of claims 1-3, characterized in that, The connecting foil (21b) includes a fuse (b2); In the extending direction (X), the fuse (b2) is located within the area of ​​the notch (a1), or the connecting foil (21b) further includes a connecting portion (b3) that is at least connected to one end of the fuse (b2) to connect the fuse (b2) and the welding foil (21a) or to connect the fuse (b2) and the sampling foil (21c), and such that the fuse (b2) is at least partially located within the area of ​​the notch (a1), wherein the width of the connecting portion (b3) increases in the direction away from the fuse (b2).

8. The acquisition component (100) according to any one of claims 1-3, characterized in that, The sampling main path (10) is a flexible flat cable, and the welding foil (21a) is laser soldered to the flexible flat cable; The insulating film (22) further includes a welding film (22c) covering the welding foil (21a), the welding film (22c) being integrally connected to the connecting film (22a), the welding film (22c) having perforated windows (c1) provided on the welding film (22c), a plurality of perforated windows (c1) being arranged at intervals along the extension direction (X), the perforated windows (c1) exposing the welding foil (21a); The insulating film (22) further includes a sampling film (22d) covering a portion of the sampling foil (21c). The sampling film (22d) covers the end of the sampling foil (21c) that is connected to the connecting foil (21b) to connect the connecting film (22a).

9. A battery, characterized in that, include: Battery cell; The busbar (200) is connected to the terminal of the battery cell; In the acquisition component (100) as described in any one of claims 1 to 8, the sampling foil (21c) is ultrasonically welded to the busbar (200).

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9, wherein the battery is used to provide electrical energy.

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