Sampling unit, sampling assembly and battery pack

Abstract

The invention discloses a sampling unit, a sampling assembly and a battery pack, the sampling unit comprises a conductor layer and a protective film arranged on the periphery of the conductor layer, the conductor layer comprises a first welding part and a second welding part, and the first welding part and the second welding part are electrically connected. The protective film is provided with at least one window at a position corresponding to the first welding part, the windows are arranged in parallel, the first welding part and the position corresponding to each window form a welding position, and at least part of the second welding part extends out of the protective film. The structural arrangement of the sampling unit facilitates the electric connection between the circuit in the FFC and the sampled object, can avoid the turnover processing of the circuit in the FFC, and facilitates the realization of industrial mass production operation.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a sampling unit, a sampling component and a battery pack. Background Art

[0002] The battery pack of an electric vehicle includes a cell module composed of multiple battery cells. The cell module is electrically connected to a sampling harness to collect the voltage signals of the battery cells and transmit them to the battery factory control system to monitor the cell status.

[0003] At present, the sampling harness for collecting voltage signals of battery cells mostly adopts FFC (Flexible Flat Cable). Multiple lines inside the FFC are arranged in parallel, and each line is in a straight line. One line can be electrically connected to the pole ear of a battery cell to collect the voltage signal of the battery cell.

[0004] The multiple cells of the battery module are arranged in a straight line. In actual operation, in order to electrically connect a circuit of the FFC with the tab of the corresponding battery cell, the circuit needs to be folded at the position of the corresponding battery cell and then welded to the tab electrically connected to the tab of the battery cell. The sampling circuit of each battery cell needs to be folded, which makes industrial operation difficult.

[0005] Similar problems also exist in other scenarios where the sampling FFC is used to sample signals. Summary of the invention

[0006] The purpose of the present application is to provide a sampling unit, a sampling assembly and a battery pack. The structural setting of the sampling unit facilitates the electrical connection between the internal circuit of the FFC and the sampled object, avoids folding the internal circuit of the FFC, and is conducive to industrial mass production operations.

[0007] In order to solve the above technical problems, an embodiment of the present application provides a sampling unit, including a conductor layer and a protective film arranged on the periphery of the conductor layer, the conductor layer includes a first welding portion and a second welding portion, the first welding portion and the second welding portion are electrically connected, the protective film has at least one window at a position corresponding to the first welding portion, the windows are arranged in parallel, the first welding portion and the position corresponding to each window form a welding position, and at least part of the second welding portion extends out of the protective film.

[0008] In a feasible solution, the conductor layer further includes a fuse, and the fuse is electrically connected between the first welding portion and the second welding portion.

[0009] In a feasible solution, the protective film has a hollow area, and the hollow area is located between the first welding part and the second welding part.

[0010] In one feasible solution, the protective film includes a first film portion and a second film portion, the first welding portion and the fuse are located in the first film portion, at least part of the second welding portion is located in the second film portion, and there is at least one weak connection point between the second film portion and the first film portion, and the hollow area of ​​the protective film includes a hollow structure formed between the first film portion and the second film portion.

[0011] In a feasible solution, the second membrane portion is in a curved structure, and the hollow area includes a hollow structure formed in the second membrane portion.

[0012] In a feasible solution, the welding position has at least one overflow through hole.

[0013] In a feasible solution, the sampling unit has a first positioning hole, and the first positioning hole passes through the conductor layer and the protective film.

[0014] In a feasible solution, the sampling unit further includes a traceability identification code, and the traceability identification code is located inside the protective film.

[0015] An embodiment of the present application also provides a sampling component, comprising at least one sampling module, wherein the sampling module comprises an FFC body and a plurality of sampling units, wherein the sampling unit is a sampling unit as described in any one of the preceding items, wherein the FFC body comprises a plurality of sampling lines, and one of the welding positions of the sampling unit is welded to one of the sampling lines.

[0016] In a feasible solution, the FFC body has a plurality of positioning parts, the positioning parts include a second positioning hole, the second positioning hole cooperates with the first positioning hole of the sampling unit, and the plurality of second positioning holes are arranged in a direction parallel to the sampling line.

[0017] In one feasible solution, the sampling component includes more than two sampling modules, and the sampling modules are stacked.

[0018] In one feasible solution, the sampling module also includes a connector, which is electrically connected to the first end of the FFC body, and the connector is electrically connected to the plurality of sampling lines; the sampling line electrically connected to the sampling unit has a break point, and the break point is located on the side of the sampling unit away from the first end of the FFC body, and the sampling line is disconnected at the location of the break point.

[0019] An embodiment of the present application further provides a battery pack, comprising a battery cell module and a sampling component, wherein the sampling component is the sampling component described in any one of the preceding items, and the battery cell module comprises a plurality of battery cells, and the battery cells are electrically connected to the sampling unit.

[0020] In the sampling unit, sampling assembly and battery pack provided in the embodiments of the present application, the sampling assembly includes a sampling unit and an FFC body, the first welding portion of the sampling unit can be connected to the sampling circuit of the FFC body by welding, and the cell tabs of the cell module of the battery pack can be electrically connected to the sampling assembly. Specifically, the tabs of the cell can be electrically connected to the second welding portion of the sampling unit in the sampling assembly to achieve electrical connection between the tabs of the cell and the sampling circuit to form a sampling loop, and the voltage and other signals of the cell can be collected. The setting of the sampling unit can achieve electrical connection between the sampling circuit of the FFC body and the tabs of the cell. In application, there is no need to fold the sampling circuit inside the FFC body, which is conducive to the industrial mass production of sampling assemblies or battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a sampling component and a bar after being assembled in an embodiment provided in the present application;

[0022] Figure 2 for Figure 1 A schematic diagram of a partial structure of the assembly structure shown;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the sampling unit;

[0024] Figure 4 for Figure 3 The schematic diagram of the structure of the sampling unit shown is a diagram without the first protective film;

[0025] Figure 5 for Figure 3 An exploded schematic diagram of the sampling unit shown;

[0026] Figure 6 It is a schematic diagram of the partial structure of the FFC body in a specific embodiment;

[0027] Figure 7 This is a schematic diagram of the structure of a sampling component in another embodiment provided in the present application.

[0028] Description of reference numerals:

[0029] Sampling assembly 100, first sampling module 101, second sampling module 102, third sampling module 103, fourth sampling module 104, adhesive layer 105;

[0030] Sampling unit 10, conductor layer 11, first welding portion 111, welding position 1111, overflow through hole 1112, second welding portion 112, fuse 113, connecting line 114, avoidance hole 115, protective film 12, first film portion 12A, second film portion 12B, first protective film 1211, second protective film 1212, window 122, hollow area 123, first connection point 1241, second connection point 1242, first positioning hole 13, traceability identification code 14;

[0031] FFC body 20, sampling line 21, protective film 22, positioning portion 23, second positioning hole 231, connector 30;

[0032] Piece 01. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] The ordinal numbers such as first and second used in this article are to distinguish different components with the same name, and do not indicate a specific order or a primary and secondary relationship.

[0035] For ease of understanding and concise description, the battery pack, sampling assembly and sampling unit are described together below, and the beneficial effects are not repeated.

[0036] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the sampling component and the bar after being assembled in an embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the partial structure of the assembly structure shown.

[0037] An embodiment of the present application provides a battery pack, which includes a battery cell module and a sampling assembly 100 .

[0038] The embodiment of the present application also provides a sampling component 100, which is used to collect relevant signals of the battery pack, such as the pressure signal of the battery cell or the temperature signal of the battery pack.

[0039] The cell module includes a plurality of cells, each of which has a tab, which can be electrically connected to a busbar 01, which can also be called a busbar and can be made of aluminum. To clearly illustrate the connection relationship between the sampling assembly 100 and the busbar 01, Figure 1 The battery cells are not shown in the figure, only the bar pieces 01 electrically connected to the battery cells are shown. The arrangement of the battery cells in the battery module can be seen from the arrangement of the bar pieces 01.

[0040] by Figure 1In the orientation shown, a plurality of bars are provided on both sides of the width direction W of the sampling component 100 , and a plurality of battery cells on each side are arranged along the length direction L of the sampling component 100 . Correspondingly, a plurality of bars 01 on each side are also arranged along the length direction L of the sampling component 100 .

[0041] In other implementations, the battery cells of the battery cell module may have other arrangements, and accordingly, the positional relationship between the sampling component 100 and the battery cells may also be adaptively adjusted.

[0042] The sampling component 100 includes at least one sampling module, the sampling module includes an FFC body 20 and multiple sampling units 10, the FFC body 20 includes multiple sampling lines 21, and the sampling unit 10 is electrically connected to a sampling line 21 and a bar 01, so that the sampling line 21 can collect relevant signals (such as voltage) of the battery cell electrically connected to the bar 01.

[0043] by Figure 1 In the example shown, the length direction of the FFC body 20 of the sampling module is the length direction L of the sampling component 100, which is also the extension direction of the sampling line 21, and the width direction of the FFC body 20 is the width direction of the sampling component 100, which is also the arrangement direction of the multiple sampling lines 21 of the FFC body 20.

[0044] In order to facilitate the electrical connection of the cells on both sides of the sampling assembly 100 with the sampling circuit 21 of the sampling assembly 100 , the plurality of sampling units 10 are also divided into two groups, which are respectively arranged on both sides of the width direction W of the FFC body 20 .

[0045] The FFC body 20 also includes a protective film 22 covering a plurality of sampling lines 21. Figure 2 In order to clearly illustrate the connection relationship between the sampling line 21 and the sampling unit 10, the protective film 22 of the FFC body 20 is not shown.

[0046] Obviously, different sampling units 10 are electrically connected to different sampling lines 21. Figure 2 In the orientation shown, the first sampling unit 10 from left to right is welded to a bar piece 01 located on the upper side of the FFC body 20, and the first sampling unit 10 is welded to the third sampling line 21 from top to bottom of the FFC body 20 to form a first welding point 1S. The third sampling unit 10 from left to right is welded to another bar piece 01 located on the upper side of the FFC body 20, and the third sampling unit 10 is welded to the fourth sampling line 21 from top to bottom of the FFC body 20 to form a second welding line 2S. The first welding point 1S and the second welding point 2S are indicated by black blocks in the figure.

[0047] To facilitate welding of the sampling unit 10 and the corresponding sampling line 21 , the protective film 22 of the FFC body 20 is further windowed at the welding position between the sampling line 21 and the sampling unit 10 , so that the sampling line 21 at the welding position is exposed.

[0048] The embodiment of the present application also provides a sampling unit 10. Through the setting of the sampling unit 10, the sampling line 21 of the FFC body 20 can be electrically connected to the bar piece 01 through the sampling unit 10, avoiding the need to fold the sampling line to weld it to the bar piece in the background technology, which is conducive to realizing industrial mass production operations.

[0049] The following focuses on a detailed introduction of the sampling unit 10 and the sampling assembly 100 provided with the sampling unit 10. The structure of the battery cell module of the battery pack can be understood by referring to the existing technology. It is not the core of the invention of this application and will not be described in detail here.

[0050] Please refer to Figures 3 to 5 , Figure 3 for Figure 1 Schematic diagram of the structure of the sampling unit. Figure 4 for Figure 3 The schematic diagram of the structure of the sampling unit shown in the figure hides the first protective film. Figure 5 for Figure 3 Exploded schematic diagram of the sampling unit shown.

[0051] In this embodiment, the sampling unit 10 includes a conductor layer 11 and a protective film 12 arranged on the periphery of the conductor layer 11, the conductor layer 11 includes a first welding portion 111 and a second welding portion 112, the first welding portion 111 and the second welding portion 112 are electrically connected, the protective film 12 has at least one window 122 at a position corresponding to the first welding portion 112, the first welding portion 111 and the position corresponding to each window 122 form a welding position 1111, and at least part of the second welding portion 112 extends out of the protective film 12.

[0052] When the protective film 12 is provided with a plurality of windows 122 at positions corresponding to the first welding portion 112, the plurality of windows 122 are arranged in parallel. Accordingly, the sampling unit 10 has a plurality of welding positions 1111, and it can be understood that the plurality of welding positions 1111 of the first welding portion 111 are also arranged in parallel. In a general configuration, the unit 10 is provided with a plurality of windows 122 and corresponding welding positions 1111, so as to facilitate the sampling unit 10 to be welded with the sampling lines 21 at different positions of the FFC body 20 as required, and the flexibility is high.

[0053] In the illustrated example, the window 122 of the protective film 12 of the sampling unit 10 is rectangular; in other implementations, the shape of the window 122 may also be a runway shape, an ellipse, or other shapes.

[0054] Exemplarily, the conductor layer 11 may be made of copper foil, which is easy to obtain and has low cost.

[0055] Exemplarily, the protective film 12 may be made of PI (Polyimide Film).

[0056] When the sampling unit 10 and the FFC body 20 form a sampling module, Figure 1 and Figure 2 , one of the multiple welding positions 1111 of the first welding portion 111 of the sampling unit 10 is welded to one of the sampling lines 21 of the FFC body 20 .

[0057] It should be pointed out that although the sampling unit 10 is provided with a plurality of welding positions 1111 , in actual application, only one welding position 1111 is needed to be welded with the sampling line 20 , and not all welding positions 1111 are needed.

[0058] Still Figure 2 For example, the second welding position 1111 corresponding to the second window 112 position from top to bottom of the first sampling unit 10 is welded to the third sampling circuit 21 from top to bottom to form a first welding point 1S, and the third welding position 1111 corresponding to the third window 112 position from top to bottom of the third sampling unit 10 is welded to the fourth sampling circuit 21 from top to bottom to form a second welding point 2S.

[0059] Exemplarily, the welding position 1111 between the sampling line 21 of the FFC body 20 and the sampling unit 10 may be welded by laser soldering or Hotbar soldering (hot-pressing tin melting welding).

[0060] In application, after the sampling line 21 is welded to the welding position 1111 of the sampling unit 10, overall glue spot protection can be performed in the welding area.

[0061] Combination Figure 1 and Figure 2 In application, when the sampling unit 10 cooperates with the FFC body 20, the arrangement direction of the multiple windows 122 of the sampling unit 10 is arranged consistently with the width direction W of the FFC body 20. In this way, a suitable welding position 1111 can be selected as needed to be welded with a suitable sampling line 21 of the FFC body 20.

[0062] In specific settings, the spacing distance between two adjacent welding positions 1111 of the sampling unit 10 can be the same as the spacing distance between multiple sampling lines 21 of the FFC body 20. In this way, after the relative position of the sampling unit 10 and the FFC body 20 is determined, each welding position 1111 of the sampling unit 10 can correspond to the position of a sampling line 21. In the application, one of the welding positions 1111 can be welded to the sampling line 21 at the corresponding position as needed, without performing additional operations.

[0063] The second welding portion 112 of the sampling unit 10 is used to be welded to the bar sheet 01 , and the tabs of the battery cell are welded to the bar sheet 01 , so that the battery cell is electrically connected to the sampling line 21 through the sampling unit 10 .

[0064] For example, the second welding part 112 and the bar sheet 01 can be welded by ultrasonic direct welding. The bar sheet 01 is generally made of aluminum bar, and the thickness of the conductor layer 11 can be about 70 μm, so that after welding the bar sheet 01 and the second welding part 112, the peeling force between the two can reach more than 15N, ensuring welding reliability.

[0065] In one embodiment, the conductor layer 11 of the sampling unit 10 further includes a fuse 113, and the fuse 113 is electrically connected between the first welding portion 111 and the second welding portion 112. In this way, the sampling circuit of the battery cell can be effectively protected.

[0066] In one embodiment, the protective film 12 has a hollow area 123, and the hollow area 123 is located between the first welding portion 111 and the second welding portion 112. The hollow area 123 is provided so that the second welding portion 112 has space to move relative to the first welding portion 111.

[0067] After the sampling assembly 100 is electrically connected to the tab 01, the second welding portion 112 of the sampling unit 10 is welded and fixed to the tab 01, and the tab 01 is welded and fixed to the tab of the battery cell. During use, the battery cell expands, which will cause the tab 01 to move. The second welding portion 112 welded to the tab 01 will also move with the tab 01, thereby pulling the sampling unit 10, and then pulling the FFC body 20 welded to the sampling unit 10.

[0068] After the hollow area 123 is set on the protective film 12, the second welding part 112 can be provided with conditions for moving relative to the first welding part 111. In application, when the battery cell expands, the second welding part 112 moves with the bar 01, which can avoid pulling on the first welding part 111 and the FFC body 20, thereby improving the safety and reliability of the sampling component 100.

[0069] In one implementation, the protective film 12 includes a first film portion 12A and a second film portion 12B, the first welding portion 111 and the fuse 113 are located in the first film portion 12A, at least part of the second welding portion 112 is located in the second film portion 12B, there is at least one weak connection point between the second film portion 12B and the first film portion 12A, and the hollow area 123 is formed between the first film portion 12A and the second film portion 12B. The weak connection point here refers to a point that can be broken under the action of an external force.

[0070] With this arrangement, when the battery cell expands and causes the tab 01 to move, the pulling force generated by the tab 01 driving the second welding portion 112 to move can break the connection point between the second membrane portion 12B and the first membrane portion 12A, thereby allowing the second welding portion 112 to move relative to the first welding portion 111 located on the first membrane portion 12A, ensuring that the first welding portion 111 will not move therewith.

[0071] In applications, the conductor layer 11 may include a connection line 114, and the fuse 113 is electrically connected to the second welding portion 112 via the connection line 114. At least a portion of the connection line 114 is located at the second film portion 12B.

[0072] In an application example, the connection line 114 is a curved structure, and the second membrane portion 12B corresponding to the connection line 114 is also a curved structure. After the second membrane portion 12B is bent, a hollow structure can be formed between the second membrane portion 12B and the first membrane portion 12A. The second membrane portion 12B can also form a hollow structure by bending itself. The aforementioned hollow area 123 includes the hollow structure between the first membrane portion 12A and the second membrane portion 12B, and can also include the hollow structure formed by the bending of the second membrane portion 12B itself. In this way, the hollow area can be flexibly set, so that the second welding portion 112 has a larger moving space relative to the first welding portion 111, and when the second welding portion 112 moves with the bar sheet 01, it is ensured that the first welding portion 111 will not move with it.

[0073] Figure 3 The dotted line frame generally indicates the area where the second film portion 12B is located, and the area of ​​the protective film 12 other than the second film portion 12B is the first film portion 12A. It should be pointed out that the division of the first film portion 12A and the second film portion 12B is only for the convenience of explaining the implementation method of the second welding portion 112 being movable relative to the first welding portion 111.

[0074] In the illustrated example, there are two weak connection points between the second membrane portion 12B and the first membrane portion 12A, namely a first connection point 1241 and a second connection point 1242. The connection line 114 is bent in an S shape as a whole.

[0075] In other implementation schemes, the position and shape of the hollow area 123A, the number and position of the connection points between the second membrane portion 12B and the first membrane portion 12A, etc. can all have other forms as needed, as long as the second welding portion 112 can move relative to the first welding portion 111 under the action of external force.

[0076] In one embodiment, the protective film 12 includes a first protective film 1211 and a second protective film 1212, the first protective film 1211 and the second protective film 1212 respectively cover the two surfaces of the conductor layer 11, or the conductor layer 11 is clamped between the first protective film 1211 and the second protective film 1212, and the first protective film 1211 and the second protective film 1212 can be fixed by heat pressing. Figure 5 It is understood that the first protection film 1211 and the second protection film 1212 are basically arranged in a conformal manner with the conductor layer 11 .

[0077] Each welding position 1111 of the conductor layer 11 has at least one overflow through hole 1112 to facilitate the fluidity of solder when welding the welding position 1111 and the sampling line 21, thereby ensuring the welding effect.

[0078] In the illustrated example, one welding position 1111 has three overflow through holes 1112 .

[0079] like Figure 5 As shown, the first protective film 1211 and the second protective film 1212 are both provided with a plurality of openings 122, and the positions of the openings 122 of the two are corresponding to each other, so that after assembly, the welding position 1111 of the conductor layer 11 is exposed and the flow of solder during welding is convenient.

[0080] In one embodiment, the sampling unit 10 further includes a traceability identification code 14 , and the traceability identification code 14 is located inside the protective film 12 .

[0081] In one implementation, the conductor layer 11 has an avoidance hole 115 , and the traceability identification code 14 is located in the avoidance hole 115 .

[0082] The setting of the traceability identification code 14 can facilitate the accurate tracing of each sampling unit 10 in the later stage. The traceability identification code 14 can be in the form of a two-dimensional code or the like.

[0083] Please refer to Figure 6 , Figure 6 It is a schematic diagram of the partial structure of the FFC body in a specific embodiment. Figure 6 In order to clearly illustrate the relative positional relationship between the sampling line 21 and the protective film 22 , the film portion covering the sampling line 21 is hidden, and only the film portion located below the sampling line 21 is retained.

[0084] In one embodiment, the sampling unit 10 has a first positioning hole 13, and the first positioning hole 13 penetrates the conductor layer 11 and the protective film 12. Accordingly, the FFC body 20 is provided with a positioning portion 23, and the positioning portion 23 is used to cooperate with the first positioning hole 13 to position the sampling unit 10, specifically to achieve the positioning of the sampling unit 10 and the FFC body 20 when they are assembled.

[0085] In application, the positioning requirements of the sampling unit 10 and the FFC body 20 are as follows: ensure that each welding position 1111 of the sampling unit 10 corresponds to the position of a part of the sampling line 21 of the FFC body 20, and the second welding part 112 is located outside the FFC body 20 to facilitate welding with the bar 01.

[0086] The arrangement of the aforementioned positioning structure is beneficial to the industrialized mass production of the assembly of the sampling unit 10 and the FFC body 20 .

[0087] Exemplarily, the sampling unit 10 has two first positioning holes 13 , and the positioning portion 23 on the FFC body 20 that matches with one sampling unit 10 has two second positioning holes 231 to respectively match with the two first positioning holes 13 .

[0088] In one implementation, the plurality of second positioning holes 231 of the FFC body 20 are arranged in a direction parallel to the sampling line 21. In this way, on the one hand, processing is convenient, and on the other hand, if the second positioning hole 231 occupies the position of the sampling line 21 of the FFC body 20, only one sampling line 21 can be sacrificed, and the sampling line 21 occupied by the second positioning hole 231 cannot be used for sampling.

[0089] like Figure 6 As shown, the positioning portion 23 of the FFC body 20 is approximately located in the middle of the FFC body 20 in the width direction W, so that the sampling units 10 located on both sides of the FFC body 20 can be easily positioned with the FFC body 20.

[0090] In one embodiment, the sampling module of the sampling assembly 100 further includes a connector 30, such as Figure 1 The connector 30 is electrically connected to the first end of the FFC body 20, and the connector 30 is electrically connected to multiple sampling circuits of the FFC body 20; the sampling circuit 21 electrically connected to the sampling unit 10 has a break point (not shown in the figure), and the break point is located on the side of the sampling unit 10 away from the first end of the FFC body 20, that is, the break point is located between the sampling unit 10 and the second end of the FFC body 20, and the sampling circuit 21 is disconnected at the break point. This arrangement does not affect the formation of the sampling loop, and can also prevent the sampling circuit 21 from being corroded by salt fog and other conditions that may be generated in the surrounding environment when the second end of the FFC body 20 is not protected, thereby affecting the reliability and accuracy of the sampling.

[0091] In practical applications, an empty circuit may be left on the outermost sides of the FFC body 20 in the width direction W to increase the protection of the sampling circuit 21 of the FFC body 20 , that is, the sampling circuit 21 is located between the two empty circuits.

[0092] Figure 1 and Figure 2 In the illustrated embodiment, the sampling component 100 includes only one sampling module. In other embodiments, the sampling component 100 may also include more than two sampling modules.

[0093] When the sampling assembly 100 includes more than two sampling modules, each sampling module is stacked and arranged, and the structure of each sampling module is as described above and will not be repeated. The stacking arrangement of each sampling module can reduce the occupied area of ​​the sampling assembly 100 and facilitate the layout of the sampling assembly 100 and the battery cell.

[0094] refer to Figure 7 , Figure 7 A sampling assembly 100 having a plurality of sampling modules is illustrated.

[0095] Figure 7 In the example shown, the sampling assembly 100 has four stacked sampling modules, namely, a first sampling module 101, a second sampling module 102, a third sampling module 103, and a fourth sampling module 104. In the specific arrangement, the sampling unit 10 of the first sampling module 101 can be located on the side of its FFC body 20 away from the second sampling module 102, the sampling unit 10 of the second sampling module 102 can be arranged close to the FFC body 20 of the first sampling module 101, the sampling unit 10 of the third sampling module 103 can be arranged away from the FFC body 20 of the second sampling module 102, and the sampling unit 10 of the fourth sampling module 104 can be arranged away from the FFC body 20 of the third sampling module 103.

[0096] Adjacent sampling modules 102 are fixed via an adhesive layer 105 .

[0097] Exemplarily, the adhesive layer 105 may be a double-sided adhesive tape.

[0098] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A sampling unit, characterized in that: It includes a conductor layer and a protective film arranged on the periphery of the conductor layer, the conductor layer includes a first welding part and a second welding part, the first welding part and the second welding part are electrically connected, the protective film has at least one window at a position corresponding to the first welding part, the windows are arranged in parallel, the first welding part and the position corresponding to each window form a welding position, and at least part of the second welding part extends out of the protective film.

2. The sampling unit according to claim 1, characterized in that: The conductor layer further includes a fuse electrically connected between the first welding portion and the second welding portion.

3. The sampling unit according to claim 1, characterized in that: The protective film has a hollow area, and the hollow area is located between the first welding part and the second welding part.

4. The sampling unit according to claim 2, characterized in that: The protective film includes a first film portion and a second film portion, the first welding portion and the fuse are located in the first film portion, at least part of the second welding portion is located in the second film portion, and there is at least one weak connection point between the second film portion and the first film portion. The hollow area of ​​the protective film includes a hollow structure formed between the first film portion and the second film portion.

5. The sampling unit according to claim 4, characterized in that: The second membrane portion has a curved structure, and the hollow area includes a hollow structure formed in the second membrane portion.

6. The sampling unit according to any one of claims 1 to 5, characterized in that: The welding position has at least one flash through hole.

7. The sampling unit according to any one of claims 1 to 5, characterized in that: The sampling unit has a first positioning hole, and the first positioning hole penetrates the conductor layer and the protective film.

8. The sampling unit according to any one of claims 1 to 5, characterized in that: The sampling unit further comprises a traceability identification code, and the traceability identification code is located inside the protective film.

9. A sampling assembly, characterized in that It comprises at least one sampling module, the sampling module comprises an FFC body and a plurality of sampling units, the sampling unit is the sampling unit according to any one of claims 1 to 8, the FFC body comprises a plurality of sampling lines, and one of the welding positions of the sampling unit is welded to one of the sampling lines.

10. The sampling assembly according to claim 9, characterized in that: The FFC body has a plurality of positioning parts, the positioning parts include a second positioning hole, the second positioning hole matches with the first positioning hole of the sampling unit, and the plurality of second positioning holes are arranged in a direction parallel to the sampling line.

11. The sampling assembly according to claim 10, characterized in that: The sampling component includes more than two sampling modules, and each sampling module is stacked.

12. The sampling assembly according to any one of claims 9 to 11, characterized in that: The sampling module also includes a connector, which is electrically connected to the first end of the FFC body and is electrically connected to the plurality of sampling lines; the sampling line electrically connected to the sampling unit has a break point, which is located on a side of the sampling unit away from the first end of the FFC body, and the sampling line is disconnected at the location of the break point.

13. A battery pack, characterized in that: It comprises a battery cell module and a sampling component, wherein the sampling component is the sampling component according to any one of claims 9 to 12, and the battery cell module comprises a plurality of battery cells, and the battery cells are electrically connected to the sampling unit.

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