Sampling components, sampling modules and batteries

Abstract

This application relates to a sampling component, a sampling assembly, and a battery. The sampling component includes a metal foil layer and a first insulating film layer. The metal foil layer includes two welded foil segments and a buffer foil segment connected between the two welded foil segments. The first insulating film layer includes two welded film segments and a buffer film segment connected between the two welded film segments. Each welded film segment covers a portion of one welded foil segment, and the buffer film segment covers the buffer foil segment. The first insulating film layer also includes a weak film segment, which is positioned and connected to at least one welded film segment via a weak film segment. The weak film segment is configured to break when the buffer film segment is subjected to tensile force. The technical solution of this application helps to improve the welding quality of the sampling component and the battery cell in the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to sampling components, sampling assemblies and batteries. Background Technology

[0002] A battery is composed of multiple individual cells connected in series or parallel. A sampling component can collect operating information such as voltage and temperature from each individual cell. The sampling component includes a main circuit board and sampling branches. The sampling branches are mostly soldered to the individual cells and to the main circuit board. After prolonged charging and discharging, adjacent cells expand and deform, causing changes in the position of the main circuit board and the individual cells. Furthermore, the flexible circuit board is relatively thin, and the sampling branches are subject to stretching, leading to tearing, detachment, and other failures.

[0003] In related technologies, a buffer section is set in the sampling branch to absorb the expansion and deformation of the battery cells. However, when the sampling branch is soldered to the battery cells and the main circuit board, the buffer section is easily deformed by slight external forces, changing the soldering position, causing poor soldering and affecting battery performance. Utility Model Content

[0004] Therefore, it is necessary to provide a sampling component, sampling assembly, and battery to address the problem of poor welding caused by deformation of the buffer section during the welding of the sampling branch.

[0005] Firstly, this application proposes a sampling component, comprising:

[0006] The metal foil layer includes two solder foil segments and a buffer foil segment buffered between the two solder foil segments; and

[0007] The first insulating film layer includes two welding film segments and a buffer film segment connected between the two welding film segments, each welding film segment correspondingly covering a portion of one of the welding foil segments, and the buffer film segment covering the buffer foil segment;

[0008] The first insulating film layer further includes a weak film segment, and the buffer film segment is positioned and connected to at least one of the welding film segments via at least one of the weak film segments; the weak film segment is configured to break when the buffer film segment is subjected to external tensile force.

[0009] In one embodiment, the buffer foil segment includes at least one buffer sub-foil, each of the buffer sub-foil extending in a zigzag pattern and independently connected between the two welding foil segments;

[0010] The buffer membrane segment includes at least one buffer sub-membrane that independently covers each of the buffer sub-foils. The shape of each buffer sub-membrane matches the shape of the corresponding buffer sub-foil and is independently connected between the two welding membrane segments. At least one of the buffer sub-membranes is connected to the welding membrane segment by the weak membrane segment.

[0011] In one embodiment, each of the buffer sub-membranes is bent to form a buffer space with one end open;

[0012] The buffer sub-membrane has an arc-shaped end opposite to its open end; in all the buffer sub-membranes, at least one of the arc-shaped ends is connected to at least one of the welded membrane segments by the weak membrane segment.

[0013] In one embodiment, two buffer sub-membranes are configured, and the two buffer sub-membranes are open to each other and enclose each other to form a buffer hole.

[0014] In one embodiment, the buffer membrane segment has an inner wall forming the buffer hole and an outer wall opposite to the inner wall; the perimeter of the inner wall is equal to the perimeter of the outer wall.

[0015] In one embodiment, the weak membrane segment, together with the connected buffer sub-membrane and the welded membrane segment, form a clearance space.

[0016] In one embodiment, the weak membrane segment includes a fracture portion, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​other portions of the weak membrane segment, and the fracture portion is capable of breaking when the buffer membrane segment is subjected to external tensile force.

[0017] In one embodiment, one of the welding foil segments is provided with multiple rows of welding positions, and the corresponding welding film segment is provided with multiple hollow holes that independently expose each of the welding positions; the other welding foil segment is divided into a covering area and a welding area along its extension direction, and the corresponding welding film segment covers the covering area, and the covering area is connected to the buffer foil segment.

[0018] In one embodiment, the metal foil layer further includes a fuse segment located between the buffer foil segment and one of the welding foil segments; the fuse segment and the connected welding foil segment are covered by the same welding film segment.

[0019] Secondly, this application proposes a sampling component, comprising:

[0020] Main circuit board, wherein the main circuit board is a flat flexible cable; and

[0021] As described in any of the above embodiments, in each of the sampling components, the portion of the welding foil segment not covered by the welding film segment is laser soldered to the main circuit board.

[0022] Thirdly, this application proposes a battery comprising:

[0023] Battery cell;

[0024] The busbar is electrically connected to the terminals of the individual battery cells; and

[0025] As described in the above embodiments, in the sampling assembly, the portion of another welding foil segment in the sampling assembly that is not covered by the welding film segment is ultrasonically welded to the busbar.

[0026] Compared with the prior art, this application has the following beneficial effects:

[0027] In practical applications, the aforementioned sampling component, sampling assembly, and battery are first welded to the main circuit board to form the sampling assembly. Then, the other welding foil segment of the sampling component is welded to the busbar electrically connected to the battery cell's terminal post. During the welding process, the relative position between the buffer film segment and the welding film segment is restricted by the weak film segment, making the buffer film segment less prone to micro-deformation. This mitigates the problem of welding position changes due to micro-deformation of the buffer film, improving welding reliability. Furthermore, when the main circuit board and battery cell change position due to battery cell expansion or other reasons, the weak film segment is also stretched and breaks during the tensile deformation of the buffer film segment. The broken weak film segment does not restrict the deformation of the buffer film segment, thus effectively fulfilling its buffering function and reducing the risk of tearing or detachment of the sampling component. Attached Figure Description

[0028] 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, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the sampling component in some embodiments.

[0030] Figure 2 This is a schematic diagram of the sampling component in some other embodiments.

[0031] Figures 3 to 5 This is a schematic diagram of the structure of the first insulating film layer in different embodiments.

[0032] Figure 6 This is a schematic diagram of the combination of sampling components and bus in some embodiments.

[0033] Figure 7 This is a schematic diagram of the battery structure in some embodiments.

[0034] The reference numerals in the detailed embodiments are as follows:

[0035] 1000, Battery; 100, Sampling Component; 10, Sampling Member; 11, Metal Foil Layer; 11a, Welding Foil Segment; a1, Welding Position; a2, Covering Area; a3, Welding Area; 11b, Buffer Foil Segment; b1, Buffer Sub-Foil; 11c, Fuse Segment; 12, First Insulating Film Layer; 12a, Welding Film Segment; a4, Hole; 12b, Buffer Film Segment; b2, Buffer Sub-Film; f, Arc-shaped End; i, Inner Wall; o, Outer Wall; 12c, Weak Film Segment; c1, Fractured Part; h1, Buffer Space; h2, Clearance Space; h3, Buffer Hole; 20, Main Circuit Board; 21, Wire; 22, Connecting Terminal; 200, Battery Cell; 201, Terminal Post; 300, Busbar. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 internal communication of two components or the interaction between two components, 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.

[0040] 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.

[0041] 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.

[0042] To address the problems mentioned in the background art, embodiments of this application propose a sampling component, a sampling assembly, and a battery.

[0043] The sampling component in this embodiment includes a main circuit board and a sampling member. One end of the sampling member is soldered to the main circuit board, and the other end is used to connect to a busbar. The main circuit board can be a flexible circuit board, a flat flexible cable, etc.

[0044] The battery in this embodiment includes the sampling component and the battery cell described above. The battery cell is the smallest unit in the battery where the electrochemical reaction takes place, and can be a secondary battery or a primary battery. The battery cell can be a lithium-ion battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0045] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the battery cell. Specifically, the housing may have a receiving cavity formed therein, with at least one end open, and the end cap may be closed at the open end of the housing to seal the receiving cavity, and the electrode assembly may be 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.

[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, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within a single 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 also includes a battery management system (BMS). Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system. The battery management system controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then multiple battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0048] When multiple battery cells are configured, a busbar is typically used to connect the cells to their terminals to achieve series / parallel connection. The busbar is usually made of metal, such as an aluminum busbar. In this case, the other end of the sampling component is connected to the busbar.

[0049] The sampling component in this embodiment is used to collect the working data (such as voltage and temperature) of each battery cell in the battery, and transmit the collected working data to the battery management system or module management system in order to monitor the working status of the battery.

[0050] The sampling components in the embodiments of this application are described below.

[0051] Please refer to Figure 1The sampling component 10 provided in this embodiment includes a metal foil layer 11 and a first insulating film layer 12. The metal foil layer 11 includes two welded foil segments 11a and a buffer foil segment 11b connected between the two welded foil segments 11a. The first insulating film layer 12 includes two welded film segments 12a and a buffer film segment 12b connected between the two welded film segments 12a. Each welded film segment 12a covers a portion of a welded foil segment 11a, and the buffer film segment 12b covers the buffer foil segment 11b. The first insulating film layer 12 also includes a weak film segment 12c, which positions and connects the buffer film segment 12b to at least one welded film segment 12a. The weak film segment 12c is configured to break when the buffer film segment 12b is subjected to external tensile force.

[0052] The first insulating film layer 12 covers the metal foil layer 11 to achieve insulation of the metal foil layer 11. The metal foil layer 11 can be a copper foil layer, a silver foil layer, an aluminum foil layer, etc. The first insulating film layer 12 can be a PI film layer, a PET film layer, etc. The first insulating film layer 12 can be fixed to the metal foil layer 11 by hot pressing.

[0053] In the extending direction of the sampling component 10, the metal foil layer 11 is divided into two welding foil segments 11a and a buffer foil segment 11b, with the buffer foil segment 11b connected between the two welding foil segments 11a. One of the welding foil segments 11a is used for welding to the main circuit board 20, and the other welding foil segment 11a is used for welding to the bus 300, which is electrically connected to the terminal post 201 of the battery cell 200.

[0054] Each solder foil segment 11a is covered by a solder film segment 12a, and each solder film segment 12a only covers a portion of the corresponding solder foil segment 11a. The portion of the solder foil segment 11a not covered by the solder film segment 12a is used for soldering to the main circuit board 20 or busbar 300. The buffer foil segment 11b is covered by a buffer film segment 12b, and the buffer film segment 12b usually completely covers the buffer foil segment 11b, that is, the buffer foil segment 11b is not exposed.

[0055] The shapes of the buffer foil segment 11b and the buffer film segment 12b are typically matched, and both are stretchable and deformable in the extension direction of the sampling member 10 to accommodate positional changes between the two welded foil segments 11a and between the two welded film segments 12a.

[0056] The weak membrane segment 12c has a small cross-section and weak tensile strength, making it easily broken. Specifically, the breaking force of the weak membrane segment 12c is less than the weld peeling force of the welded foil segment 11a, ensuring that the weak membrane segment 12c is broken before the sampling component 10 detaches or peels off, allowing the buffer membrane segment 12b and the buffer foil segment 11b to exert their buffering capacity without causing the weld joint to detach. The weak membrane segment 12c is typically integrally connected with the connected buffer membrane segment 12b and welded membrane segment 12a.

[0057] In practical applications, the aforementioned sampling component 10 is first welded to the main circuit board 20 via a welding foil segment 11a to form a sampling assembly 100. Then, the other welding foil segment 11a is welded to the busbar 300. During the welding process, the relative position between the buffer film segment 12b and the welding film segment 12a is restricted by the weak film segment 12c. This prevents the buffer film segment 12b from undergoing micro-deformation, thus mitigating the problem of welding position changes due to micro-deformation of the buffer film segment 12b and improving welding reliability. Furthermore, when the main circuit board 20 and the battery cell 200 change position due to factors such as battery cell expansion, the weak film segment 12c also breaks under tension during the tensile deformation of the buffer film segment 12b. The broken weak film segment 12c does not restrict the deformation of the buffer film segment 12b, allowing the buffer film segment 12b to function effectively and reducing the risk of tearing or detachment of the sampling component 10.

[0058] In some embodiments, refer to Figure 1 and Figure 2 The buffer foil segment 11b includes at least one buffer sub-foil b1, each buffer sub-foil b1 extending in a zigzag pattern and independently connected to the two welding foil segments 11a. The buffer film segment 12b includes at least one buffer sub-film b2 independently covering each buffer sub-foil b1, the shape of each buffer sub-film b2 matching the shape of the corresponding buffer sub-foil b1, and independently connected to the two welding film segments 12a. A weak film segment 12c connects at least one buffer sub-film b2 to the welding film segment 12a.

[0059] The number of buffer foils b1 and buffer membranes b2 is the same, and each buffer foil b1 is covered by a buffer membrane b2. Each buffer membrane b2 is independently and integrally connected to the welding membrane segment 12a. The buffer foils b1 and buffer membranes b2 are shaped to match, and can extend in an S-shape, C-shape, etc. They extend and deform synchronously when under tension to achieve a buffering effect.

[0060] In a specific example, such as Figure 1 As shown, the number of buffer foils b1 and buffer films b2 is 1 each. In this case, the small number of buffer films b2 reduces costs. Specifically, the buffer foils b1 and buffer films b2 can be approximately U-shaped. Further, a weak film segment 12c can be provided between the buffer film b2 and one of the welding film segments 12a. Under the constraint of the weak film segment 12c, the buffer film b2 is less prone to micro-deformation, thus improving welding quality. Even further, weak film segments 12c can be provided between the buffer film b2 and the welding film segments 12a on both sides. In this case, the position of the buffer film b2 is better fixed, and micro-deformation is less likely to occur during welding. Under good positioning, the welding quality is significantly improved.

[0061] The number of buffer foils b1 and buffer membranes b2 can also be greater than or equal to two, so that when some of the buffer foils b1 break, the sampling member 10 can still transmit data through the other buffer foils b1, resulting in higher reliability of the sampling member 10. Furthermore, the configuration of multiple buffer foils b1 and multiple buffer membranes b2 reduces the tensile force borne by each buffer foil b1 and multiple buffer membranes b2 under the same external tensile force, thereby reducing the risk of the buffer foils b1 and multiple buffer membranes b2 being torn and improving the overall tensile strength of the buffer membrane segment 12b.

[0062] When there are multiple buffer sub-membranes b2, a weak membrane segment 12c is provided between at least one buffer sub-membrane b2 and at least one welded membrane segment 12a. Alternatively, a weak membrane segment 12c may be provided between each buffer sub-membrane b2 and two welded membrane segments 12a (e.g., Figure 2 (As shown). Alternatively, a weak membrane segment 12c (as shown) can be provided between only one welding membrane segment 12a and one buffer sub-membrane b2. Figure 3 (As shown). Alternatively, a weak membrane segment 12c is not provided between only one welding membrane segment 12a and one buffer sub-membrane b2 (as shown). Figure 4 (As shown). Alternatively, a weak membrane segment 12c (as shown) can be provided between only one welding membrane segment 12a and the two buffer sub-membranes b2. Figure 5 (As shown).

[0063] In some embodiments, refer to Figure 3 , Figure 4 and Figure 5 Each buffer sub-membrane b2 is bent to form a buffer space h1 with one end open, and the buffer sub-membrane b2 has an arc-shaped end f opposite to its open end. Among all the buffer sub-membranes b2, at least one arc-shaped end f is connected to at least one welded membrane segment 12a by a weak membrane segment 12c.

[0064] That is, the buffer sub-membrane b2 is roughly C-shaped or U-shaped, and the buffer space h1 forms a space for the deformation of the buffer sub-membrane b2. The buffer sub-membrane b2 has smooth transitions at all points, and fatigue damage is not likely to occur at the bending points during repeated elastic deformation. Moreover, the buffer sub-membrane b2 occupies a small space in the extension direction of the sampling member 10, and the sampling member 10 can adapt to situations where the distance between the pole post 201 and the main circuit board 20 is relatively small.

[0065] In addition, the weak membrane segment 12c is connected between the arc-shaped end f and the welded membrane segment 12a. The weak membrane segment 12c is arranged close to the outer side of the sampling member 10 in the width direction of the sampling member 10. The weak membrane segment 12c has a strong positioning effect on the buffer sub-membrane b2 and can effectively prevent micro-deformation from occurring during the welding of the buffer sub-segment.

[0066] Further in the embodiments, refer to Figure 3 , Figure 4 and Figure 5 There are two buffer sub-membranes b2, which are relatively open and enclose each other to form a buffer hole h3.

[0067] That is, two buffer sub-membranes b2, roughly U-shaped or C-shaped, bend and enclose each other with their openings facing away from each other to form a buffer hole h3. The buffer hole h3 is roughly circular or elliptical and contains a buffer space h1 for the two buffer sub-membranes b2. When the positional change between the main circuit board 20 and the battery cell 200 is large, the two buffer sub-membranes b2 share the external tensile force, which is equivalent to a decrease in the tensile force borne by each buffer sub-membrane b2. This reduces the risk of each buffer sub-membrane b2 being torn apart and improves the overall tensile strength of the buffer membrane segment 12b. Moreover, the number of two buffer sub-membranes b2 also takes into account economic efficiency.

[0068] Further in the embodiments, refer to Figures 3 to 5 The buffer membrane segment 12b has an inner wall i forming a buffer hole h3 and an outer wall o opposite to the inner wall i, the perimeter of the inner wall i being equal to the perimeter of the outer wall o.

[0069] In other words, the perimeter of the side forming the inner wall i of each buffer sub-membrane b2 is equal to the perimeter of the side forming the outer wall o. Typically, the inner walls i of the two buffer sub-membranes b2 are connected by a rounded transition at both ends, and the outer walls o of the two buffer sub-membranes b2 are connected by a rounded transition at both ends to the welded membrane segment 12a. The transition connection helps to alleviate stress concentration.

[0070] Since the inner wall i and the outer wall o of the buffer membrane segment 12b have the same perimeter, when the buffer membrane segment 12b is straightened, stress concentration at these arc transition joints can be further avoided, reducing the probability of damage to the buffer membrane segment 12b at these arc transition joints.

[0071] In some embodiments, refer to Figures 1 to 5 The weak membrane segment 12c, together with the connected buffer sub-membrane b2 and the welded membrane segment 12a, form an avoidance space h2.

[0072] When the battery cell 200 expands, the sampling member 10 will be subjected to tensile force in its width direction, causing one side of the buffer membrane b2 to be stretched and the other side of the buffer membrane b2 to be compressed. The setting of the clearance space h2 increases the deformation space of the buffer membrane b2 on the compressed side, which helps to give full play to the buffering capacity of the buffer membrane b2.

[0073] In some embodiments, such as Figures 1 to 5 The weak membrane segment 12c includes a fracture portion c1, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​other parts of the weak membrane segment 12c, and the fracture portion c1 is capable of breaking when the buffer membrane segment 12b is subjected to external force for tension.

[0074] One end of the weak membrane segment 12c is connected to the buffer membrane segment 12b, and the other end is connected to the welded membrane segment 12a. Its cross-section is perpendicular to its extension direction, and its cross-sectional area is the area of ​​its cross-section. The fracture point c1 is the position where the cross-sectional area of ​​the weak membrane segment 12c is the smallest. The cross-sectional area of ​​the weak membrane segment 12c increases from its fracture point c1 towards both ends in the extension direction.

[0075] To minimize the cross-sectional area of ​​the fracture site c1, one approach is to design the minimum width of the weak membrane segment 12c at the fracture site c1. Another approach is to create an opening at the fracture site c1 to reduce the cross-sectional area at that location.

[0076] At this point, the cross-sectional area of ​​the fractured part c1 is minimized to make the weak membrane segment 12c easy to break. The structure is simple and facilitates the integral molding of the weak membrane segment 12c with the welded membrane segment 12a and the buffer membrane segment 12b.

[0077] Of course, in other embodiments, if the weak membrane segment 12c is not integrally formed with the welding membrane segment 12a and the buffer membrane segment 12b, a more easily broken material can be selected to make the weak membrane segment 12c easier to break.

[0078] In some embodiments, refer to Figure 1 and Figure 2 One of the welding foil segments 11a has multiple rows of welding positions a1, and the corresponding welding film segment 12a has multiple hollow holes a4 that independently expose each welding position a1. The other welding foil segment 11a is divided into a covering area a2 and a welding area a3 along its extension direction, and the corresponding welding film segment 12a covers the covering area a2. The covering area a2 is connected to the buffer foil segment 11b.

[0079] One of the welding foil segments 11a is referred to as the first welding foil segment, and the other welding foil segment 11a is referred to as the second welding foil segment. The welding film segment 12a corresponding to the first welding foil segment is the first welding film segment, and the welding foil segment 11a corresponding to the second welding foil segment is the second welding film segment.

[0080] The first welding foil segment has multiple rows of welding positions a1, and the rows of welding positions a1 are arranged at intervals along the extension direction of the sampling component 10. The first welding film segment has multiple hollow holes a4, and each hollow hole a4 exposes a welding position a1, so that the welding position a1 can be welded to the main circuit board 20.

[0081] Understandably, the main circuit board 20 is soldered with multiple sampling components 10 to achieve the acquisition and transmission of working data from multiple battery cells 200. In practical applications, taking the main circuit board 20 as a flat flexible cable as an example, the flat flexible cable includes multiple parallel and spaced conductors 21. Each sampling component 10 selects one of the soldering positions a1 and solders it to one of the conductors 21, and the soldering positions a1 selected by different sampling components 10 are different, and the conductors 21 soldered to different sampling components 10 are different.

[0082] At this point, multiple sampling components 10 of the same specification can be welded to different wires 21 through welding positions a1 at different locations, without interfering with each other's arrangement. In this way, the specifications of the sampling components 10 can be standardized, the sampling components 10 can be mass-produced, and production costs can be reduced.

[0083] The second welding foil segment is divided into a covering area a2 and a welding area a3. The covering area a2 is connected to the buffer foil segment 11b, and the welding area a3 is used to connect to the busbar 300. The second welding film segment only wraps the covering area a2 of the second welding foil segment, while exposing the welding area a3, which facilitates the connection between the welding area a3 and the busbar 300.

[0084] At this point, the second welding film segment only covers the portion of the second welding foil segment near the buffer foil segment 11b, which can reduce the amount of the second welding film segment used and lower the cost.

[0085] In some embodiments, refer to Figure 1 and Figure 2 The metal foil layer 11 also includes a fuse segment 11c, which is located between the buffer foil segment 11b and one of the welding foil segments 11a. The fuse segment 11c and the connected welding foil segment 11a are covered by the same welding film segment 12a.

[0086] The fuse segment 11c is a generally curved and extended filament that melts when the current flowing through it is too large, thereby cutting off the abnormal current and protecting the battery cell 200. Specifically, the metal foil layer 11 can be processed into the fuse segment 11c by etching or other methods. Specifically, the fuse segment 11c can be connected to the aforementioned first welding foil segment.

[0087] At this time, the fuse segment 11c and the connected welding foil segment 11a are covered by the same welding film segment 12a, making its structure more stable and preventing the buffer foil segment 11b from deforming along the length and / or width direction of the sampling member 10 due to the expansion of the battery cell 200, which would cause the fuse segment 11c to break.

[0088] In other embodiments, the fuse segment 11c is connected to the second welding foil segment mentioned above. At the same time, the fuse segment 11c and the connected welding foil segment 11a are covered by the same welding film segment 12a to improve structural reliability.

[0089] In another embodiment, the fuse segment 11c can also be directly disposed in the buffer foil segment 11b, and can be configured as needed.

[0090] In addition, some implementations of this application provide sampling components 100, combined with Figure 6 The understanding includes the main circuit board 20 and the sampling component 10 in any of the above embodiments. The main circuit board 20 is a flat flexible cable. In each sampling component 10, the portion of one of the welding foil segments 11a not covered by the welding film segment 12a is laser soldered to the main circuit board 20.

[0091] The flat, flexible cable is composed of a plurality of parallel and spaced conductors 21 covered by a second insulating film layer (not shown). A plurality of sampling components 10 are soldered onto the main circuit board 20. The first solder foil segment of each sampling component 10 is soldered to one of the conductors 21, and the first solder foil segments of different sampling components 10 are soldered to different conductors 21. Furthermore, the main circuit board 20 includes connection terminals 22 for signal connection to the battery 1000 management system or module management system.

[0092] The conductor 21 is laser soldered to the first welding foil segment. Laser soldering is a welding method with a small heat-affected zone, high welding efficiency, and high welding quality. Using laser soldering to weld the conductor 21 to the first welding foil segment helps to ensure welding quality and production efficiency.

[0093] In addition, the sampling component 100 includes other beneficial effects described in the above embodiments.

[0094] Additionally, the battery 1000 provided in some embodiments of this application is referred to... Figure 6 and Figure 7 The system includes a battery cell 200, a busbar 300, and a sampling component 100 as described in the above embodiments. The busbar 300 is electrically connected to the terminal post 201 of the battery cell 200. The portion of another welding foil segment 11a of the sampling component 100 that is not covered by the welding film segment 12a is ultrasonically welded to the busbar 300.

[0095] Specifically, the second welding foil segment of the sampling component 100 is ultrasonically welded to the busbar 300. Using ultrasonic welding of the busbar 300 and the second welding foil segment ensures welding quality while reducing production costs.

[0096] In addition, the battery 1000 includes other beneficial effects described in the above embodiments.

[0097] 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.

[0098] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively 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 sampling member (10) characterized in that, include: The metal foil layer (11) includes two solder foil segments (11a) and a buffer foil segment (11b) buffered between the two solder foil segments (11a); and The first insulating film layer (12) includes two welding film segments (12a) and a buffer film segment (12b) connected between the two welding film segments (12a). Each welding film segment (12a) covers a portion of one welding foil segment (11a), and the buffer film segment (12b) covers the buffer foil segment (11b). The first insulating film layer (12) further includes a weak film segment (12c), wherein the buffer film segment (12b) and at least one of the welding film segments (12a) are positioned and connected via at least one of the weak film segments (12c); the weak film segment (12c) is configured to break when the buffer film segment (12b) is subjected to external tensile force.

2. The sampling member (10) according to claim 1, characterized in that The buffer foil segment (11b) includes at least one buffer sub-foil (b1), each of the buffer sub-foil (b1) extending in a zigzag manner and independently connected between the two welding foil segments (11a); The buffer membrane segment (12b) includes at least one buffer sub-membrane (b2) that independently covers each of the buffer sub-foils (b1), the shape of each buffer sub-membrane (b2) matches the shape of the corresponding buffer sub-foil (b1), and is independently connected between the two welding membrane segments (12a); at least one of the buffer sub-membranes (b2) is connected to the welding membrane segment (12a) by the weak membrane segment (12c).

3. The sampling member (10) according to claim 2, characterized in that Each of the aforementioned buffer sub-membranes (b2) is bent to form a buffer space (h1) with one end open; The buffer sub-membrane (b2) has an arc-shaped end (f) opposite to its open end; in all the buffer sub-membranes (b2), at least one of the arc-shaped ends (f) is connected to at least one of the welded membrane segments (12a) by the weak membrane segment (12c).

4. The sampling member (10) according to claim 3, characterized in that Two buffer sub-membranes (b2) are configured, and the two buffer sub-membranes (b2) are open to each other and enclose each other to form a buffer hole (h3).

5. The sampling member (10) according to claim 4, characterized in that The buffer membrane segment (12b) has an inner wall (i) forming the buffer hole (h3) and an outer wall (o) opposite to the inner wall (i); the perimeter of the inner wall (i) is equal to the perimeter of the outer wall (o).

6. The sampling member (10) according to claim 2, characterized in that The weak membrane segment (12c), together with the connected buffer sub-membrane (b2) and the welded membrane segment (12a), form an avoidance space (h2).

7. The sampling member (10) according to claim 1, characterized in that The weak membrane segment (12c) includes a fracture portion (c1), the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​other portions of the weak membrane segment (12c), and the fracture portion (c1) is capable of fracturing when the buffer membrane segment (12b) is subjected to external tensile force; and / or, One of the welding foil segments (11a) is provided with multiple rows of welding positions (a1), and the corresponding welding film segment (12a) is provided with multiple hollow holes (a4) that independently expose each of the welding positions (a1); the other welding foil segment (11a) is divided into a covering area (a2) and a welding area (a3) ​​along its extension direction, and the corresponding welding film segment (12a) covers the covering area (a2), and the covering area (a2) is connected to the buffer foil segment (11b).

8. The sampling member (10) according to claim 1, characterized in that The metal foil layer (11) further includes a fuse segment (11c) located between the buffer foil segment (11b) and one of the welding foil segments (11a); the fuse segment (11c) and the connected welding foil segment (11a) are covered by the same welding film segment (12a).

9. A sampling assembly (100) characterized by, include: Main circuit board (20), wherein the main circuit board is a flat flexible cable; and In any one of the sampling components (10) as claimed in claims 1 to 8, in each of the sampling components (10), the portion of the welding foil segment (11a) not covered by the welding film segment (12a) is laser soldered to the main circuit board (20).

10. A battery, characterized by include: Battery cell (200); Busbar (300) is electrically connected to the terminal (201) of the battery cell (200); and In the sampling assembly (100) of claim 9, the portion of another welding foil segment (11a) in the sampling assembly (100) not covered by the welding film segment (12a) is ultrasonically welded to the busbar (300).

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