Sampling assembly and battery pack

Abstract

The application provides a sampling assembly and a battery pack, and relates to the technical field of batteries. The sampling assembly comprises a circuit board main body, a sampling branch line, a mounting seat and a sensor. One end of the sampling branch line is connected with the circuit board main body, and the other end is configured to be connected with a conductive part. The sampling branch line comprises a first segment in a wave shape, and the first segment is arranged close to the conductive part and is configured to absorb the pulling force caused by the swelling displacement of the battery cell. The mounting seat is connected with the conductive part. The sensor is arranged on the mounting seat, and the sensor is electrically connected with the first segment. The sensor is configured to collect temperature information of the battery cell. The sampling assembly can accurately obtain the temperature information of the battery cell, can adapt to the pulling force caused by the swelling displacement of the battery cell, and has a reliable structure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a sampling component and a battery pack. Background Technology

[0002] To facilitate thermal management strategy control of the battery pack by the Battery Management System (BMS), real-time monitoring of the cell temperature is required. Current solutions use flexible printed circuit boards (FPCs) as the integrated busbar main circuit board, placing negative temperature resistors (NTCs) in nickel strip recesses using thermally conductive adhesive. The cell temperature is determined by monitoring the temperature of the conductive busbar above the cell. However, in this measurement scheme, the cell expands in volume during multiple charge-discharge cycles, resulting in significant expansion displacement. This causes the temperature sampling branch to be subjected to peeling forces, detaching from the main circuit board and failing. Utility Model Content

[0003] The purpose of this invention is to provide a sampling component and battery pack that can adapt to the tensile force caused by the expansion and displacement of the battery cells, resulting in a more reliable structure.

[0004] In a first aspect, this utility model provides a sampling component, comprising: Circuit board body; A sampling branch line, one end of which is connected to the circuit board body and the other end is configured to be connected to a conductive component; the sampling branch line includes a wavy first segment, which is located close to the conductive component and is configured to absorb the tensile force caused by the expansion displacement of the battery cell. Mounting base, the mounting base being connected to the conductive element; A sensor is disposed on the mounting base and electrically connected to the first segment, and the sensor is configured to collect temperature information of the battery cell.

[0005] In an optional embodiment, the sampling branch line further includes a second segment and multiple welding parts. The first segment and the second segment are connected. The second segment is provided with multiple window structures arranged along a second direction. The multiple welding parts are connected to the second segment and are respectively located in the window structures. The welding parts are connected to the circuit board body. The second direction is the width direction of the circuit board body.

[0006] In an optional embodiment, the circuit board body extends along a first direction, the first segment extends in a wavy shape in a second direction, the soldering portion extends in a wavy shape in the first direction, and the first direction is the length direction of the circuit board body.

[0007] In an optional embodiment, the sampling branch line further includes a first connecting portion and a second connecting portion disposed opposite to each other along a first direction, wherein the first connecting portion and the second connecting portion are respectively connected to the welding portion; the welding portions on the first connecting portion and the welding portions on the second connecting portion are arranged alternately. The welded portion on the first connecting portion extends along a first direction, and the extended end is at a predetermined distance from the second connecting portion; The welded portion on the second connecting portion extends in the opposite direction of the first direction, and the extended end is at a predetermined distance from the first connecting portion; The first connecting part and the second connecting part are respectively connected to the sensor.

[0008] In an optional embodiment, the mounting base is provided with a first through hole, and the sensor is disposed in the first through hole; The mounting base is bonded to the conductive element, which is configured to be welded to the terminal of the battery cell. The sensor is located on the side of the conductive element closer to the battery cell, or the sensor is located on the side of the conductive element farther from the battery cell.

[0009] In an optional embodiment, the mounting base includes a first boss and a second boss stacked along a third direction, a first through hole being formed inside the first boss and the second boss, a second through hole being formed on the outer periphery of the first boss, a thermal pad being provided on the side of the second boss away from the first boss along the third direction, and the sampling branch line being connected between the second boss and the thermal pad; the third direction is the thickness direction of the circuit board body; Adhesive is applied to the first and second through holes to bond the mounting base to the conductive element and encapsulate the sensor.

[0010] In an optional embodiment, the mounting base has an adhesive groove on the side near the conductive element, and the adhesive groove communicates with the second through hole.

[0011] In an optional embodiment, when the sensor is located on the side of the conductive member close to the battery cell, the conductive member is provided with a third through hole, the second boss passes through the third through hole to the side of the conductive member close to the battery cell, and the conductive member is provided with a first clearance opening connected to the third through hole on the side close to the edge, the first clearance opening being used to avoid the sampling branch line; The size of the first boss is larger than the size of the second boss, and the area where the first boss extends horizontally to the outside of the second boss forms an annular stop portion, which abuts against the surface of the conductive member away from the battery cell. Alternatively, when the sensor is located on the side of the conductive element away from the battery cell, the conductive element is provided with a first mounting groove and a second mounting groove, the second mounting groove is located in the first mounting groove, and the depth of the second mounting groove is greater than the depth of the first mounting groove, the mounting base is located in the first mounting groove, and the thermal pad is located in the second mounting groove. The conductive component has a second clearance opening on one side near the edge. The second clearance opening is located in the first mounting groove and connected to the second mounting groove. The second clearance opening is used to avoid the sampling branch line.

[0012] In an optional implementation, the circuit board body is made of flexible flat cable.

[0013] Secondly, the present invention provides a battery pack, including a battery cell and a sampling component as described in any of the foregoing embodiments.

[0014] The sampling component provided by this invention features a wavy first segment in its sampling branch. This wavy structure absorbs the tensile force generated during the expansion and displacement of the battery cell, effectively adapting to displacement deviations caused by thermal expansion during charging and discharging, resulting in a more reliable structure. Furthermore, it eliminates the need for additional energy-absorbing grooves for buffering, simplifying the production process and improving production efficiency. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the connection between the sampling component and the battery cell provided in an embodiment of this utility model; Figure 2 A schematic diagram of the sampling branch of the sampling component provided in this embodiment of the utility model; Figure 3 A schematic diagram of the welding portion of the sampling component provided in an embodiment of this utility model; Figure 4 A first-view structural schematic diagram of the mounting base for the sampling component provided in an embodiment of this utility model; Figure 5 A second-view structural schematic diagram of the mounting base for the sampling component provided in an embodiment of this utility model; Figure 6A first-view structural schematic diagram of the connection between the conductive component, the mounting base, and the sampling branch line provided in an embodiment of this utility model; Figure 7 A second-view structural schematic diagram of the connection between the conductive component, the mounting base, and the sampling branch line provided in an embodiment of this utility model; Figure 8 A cross-sectional structural diagram of the conductive component, mounting base, and sampling branch line connection provided in an embodiment of this utility model; Figure 9 A schematic diagram illustrating the connection between the battery cell, conductive components, mounting base, and sampling branch line provided in an embodiment of this utility model; Figure 10 for Figure 9 A schematic diagram of the side cross-sectional structure; Figure 11 This is a schematic diagram of a first structure of a conductive component provided in an embodiment of the present utility model; Figure 12 This is a schematic diagram of a second structure of the conductive element provided in an embodiment of the present invention.

[0017] Icons: 110-Circuit board body; 111-Connector; 120-Sampling branch line; 121-Second insulating film; 122-First connecting part; 123-Second connecting part; 124-Welding part; 1241-Arc groove; 125-Sensor; 1201-First segment; 1203-Second segment; 1205-Window structure; 130-Mounting base; 131-First through hole; 132-First colloid; 133-Second through hole; 134-Second boss; 135-Annular stop part; 136-Glue groove; 137-First boss; 140-Conductive component; 141-Third through hole; 142-First clearance opening; 143-First mounting groove; 144-Second mounting groove; 145-Second clearance opening; 150-Thermal pad; 210-Battery cell; 220-Electrical post; 230-Top cover. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] The sampling component and battery pack provided in this embodiment of the utility model have higher temperature sampling accuracy and can absorb the tensile force caused by the expansion displacement of the battery cell, making the structure more reliable.

[0026] The sampling assembly (CCS) is an important component of the battery pack, mainly consisting of a puncture crimp connector, PI film, conductive busbar, blister bracket, and flexible flat cable (FFC). It is used to realize high-voltage series and parallel connection of battery cells, as well as battery temperature sampling and cell voltage sampling functions.

[0027] Please combine Figure 1 and Figure 2 The sampling assembly includes a circuit board body 110, a sampling branch line 120, a mounting base 130, and a sensor 125. One end of the sampling branch line 120 is connected to the circuit board body 110, and the other end is configured to connect to a conductive element 140. The sampling branch line 120 includes a wavy first segment 1201, which is located close to the conductive element 140 and configured to absorb the tensile force caused by the expansion displacement of the battery cell 210. The mounting base 130 is connected to the conductive element 140. The sensor 125 is located on the mounting base 130 and is electrically connected to the first segment 1201. The sensor 125 is configured to collect temperature information of the battery cell 210.

[0028] The sampling branch 120 has a wavy first segment 1201, preferably designed as an S-shape. This sampling component can utilize the wavy structure of the first segment 1201 itself to absorb the tensile force generated during the expansion and displacement of the battery cell, effectively adapting to displacement deviations caused by thermal expansion during battery cell charging and discharging, resulting in a more reliable structure. Furthermore, it eliminates the need for additional energy-absorbing grooves for buffering, simplifying the production process and improving production efficiency. Simultaneously, the wavy first segment 1201 not only extends the length in the first direction, increasing the displacement, but also increases the displacement in the second direction, adapting to different battery cell structures and application scenarios. In one embodiment, the wavy first segment 1201 includes at least one S-shaped structure to ensure the displacement in both the first and second directions. In other embodiments, the wavy first segment 1201 may also include multiple S-shaped structures, which are sequentially connected along the first direction to further extend the distance. In this embodiment, the first direction is the length direction of the circuit board body 110, i.e. Figure 1 The X direction is the first direction; the second direction is the width direction of the circuit board body 110, i.e. Figure 1 The sampling branch 120 may also include a second segment 1203 and multiple solder joints 124. The first segment 1201 and the second segment 1203 are connected. The second segment 1203 is provided with multiple window structures 1205 arranged along the second direction, and the multiple solder joints 124 are connected to the second segment 1203 and are respectively located in the window structures 1205, and the solder joints 124 are connected to the circuit board body 110.

[0029] Optionally, the circuit board body 110 extends along a first direction. The first segment 1201 extends in a wavy shape in a second direction. The soldering portion 124 extends in a wavy shape in the first direction. Optionally, the sampling branch line 120 further includes a first connecting portion 122 and a second connecting portion 123 arranged opposite to each other along the first direction. The first connecting portion 122 and the second connecting portion 123 are respectively connected to the soldering portion 124; the soldering portions 124 on the first connecting portion 122 and the soldering portions 124 on the second connecting portion 123 are staggered. In this embodiment, the soldering portion 124 on the first connecting portion 122 extends in the positive direction of the first direction, and the extension end is at a predetermined distance from the second connecting portion 123. It should be understood that the extension end of the soldering portion 124 on the first connecting portion 122 does not extend beyond the second connecting portion 123.

[0030] The welded portion 124 on the second connecting portion 123 extends in the opposite direction of the first direction, and the extended end is at a predetermined distance from the first connecting portion 122. Similarly, the extended end of the welded portion 124 on the second connecting portion 123 does not extend beyond the first connecting portion 122.

[0031] The first connecting portion 122 and the second connecting portion 123 are respectively connected to the sensor 125. It can be understood that the extension directions of the first connecting portion 122 and the second connecting portion 123 on the first segment 1201 are consistent with the extension direction of the first segment 1201, and are also wavy. This can accommodate the tensile force caused by the expansion of the battery cell 210, providing a buffering effect. Of the first connecting portion 122 and the second connecting portion 123, one is connected to the positive terminal of the sensor 125, and the other is connected to the negative terminal of the sensor 125.

[0032] Sensor 125 uses an NTC thermistor. A thermistor is a resistor whose resistance changes with temperature; its temperature detection principle is based on the temperature sensitivity of the material. When the temperature rises, the resistance of the thermistor decreases; when the temperature falls, the resistance increases.

[0033] The sampling branch 120 includes a temperature sampling line and a second insulating film 121 covering the surface of the temperature sampling line. The second insulating film 121 is made of PI film. The temperature sampling line includes a first connection portion 122 and a second connection portion 123. The second insulating film 121 covers the first connection portion 122 and the second connection portion 123 to form a whole, while maintaining electrical insulation isolation between the first connection portion 122 and the second connection portion 123.

[0034] In this embodiment, combined with Figure 3Laser soldering is performed at the corresponding positions of the wavy (or S-shaped) solder joint 124 and the circuit board body 110. The wavy solder joint 124 forms an arc-shaped groove 1241 at each bend. During laser soldering, as the solder paste melts, it overflows from the arc-shaped groove 1241, increasing the solder strength. Simultaneously, the solder quality at the wavy solder joint 124 can be inspected using a digital camera.

[0035] Furthermore, please combine Figure 4 and Figure 5 Optionally, the mounting base 130 has a first through hole 131, and the sensor 125 is disposed within the first through hole 131. The mounting base 130 is bonded to the conductive element 140, which is configured to be welded to the terminal post 220 of the battery cell 210. The sensor 125 is located on the side of the conductive element 140 closer to the battery cell 210 and can collect temperature information of the top cover 230 of the battery cell 210. Alternatively, the sensor 125 is located on the side of the conductive element 140 away from the battery cell 210 and can collect temperature information of the conductive element 140. The temperature information of the conductive element 140 can also reflect the temperature information of the battery cell 210 to a certain extent.

[0036] Please combine Figures 6 to 10 Optionally, the mounting base 130 includes a third direction ( Figure 1 A first protrusion 137 and a second protrusion 134 are stacked in the Z-direction, and a first through hole 131 is formed inside the first protrusion 137 and the second protrusion 134. It can be understood that the first through hole 131 penetrates the first protrusion 137 and the second protrusion 134 along a third direction. A second through hole 133 is also formed on the outer periphery of the first protrusion 137. A thermal pad 150 is provided on the side of the second protrusion 134 away from the first protrusion 137 along a third direction, and a sampling branch line 120 connects the second protrusion 134 and the thermal pad 150. The third direction is the thickness direction of the circuit board body 110. The thermal pad 150 reduces the contact thermal resistance between the sampling branch line 120 and the top cover 230 of the battery cell 210, improving the accuracy of temperature monitoring.

[0037] Adhesive is applied to the first through hole 131 and the second through hole 133 to bond the mounting base 130 to the conductive element 140 and to encapsulate the sensor 125. It should be understood that the adhesive in the first through hole 131 is the first adhesive 132. The first adhesive 132 encapsulates the sensor 125 and fixes it to the sampling branch line 120. The first adhesive 132 can be a quick-drying adhesive or other types of sealant, such as acrylic or polyurethane, to protect the sensor 125 and improve its operational stability and lifespan. The adhesive in the second through hole 133 is used to bond and fix the mounting base 130 and the conductive element 140. It can be understood that the cross-sectional shape of the second through hole 133 serves as the adhesive application path, which helps improve application efficiency.

[0038] Optionally, the mounting base 130 has an adhesive groove 136 on the side near the conductive element 140, and the adhesive groove 136 communicates with the second through hole 133. The adhesive groove 136 enhances the adhesion strength and stability between the mounting base 130 and the conductive element 140. In this embodiment, the mounting base 130 is made of insulating material, such as polyethylene or polypropylene. By bonding the mounting base 130 to the sampling branch line 120 and the conductive element 140 respectively, it serves to connect the conductive element 140 and the sampling branch line 120, and also protects the sensor 125.

[0039] Please combine Figure 11 Optionally, when the sensor 125 is located on the side of the conductive member 140 near the battery cell 210, the conductive member 140 is provided with a third through hole 141, and the second boss 134 passes through the third through hole 141 to the side of the conductive member 140 near the battery cell 210. A first clearance opening 142 connected to the third through hole 141 is opened on the side of the conductive member 140 near its edge. The first clearance opening 142 is used to avoid the sampling branch line 120. In this embodiment, the sensor 125 can directly collect the temperature information of the top cover 230 of the battery cell 210, resulting in higher temperature sampling accuracy and ensuring the accuracy of temperature monitoring.

[0040] The size of the first boss 137 is larger than the size of the second boss 134. The area where the first boss 137 extends horizontally to the outside of the second boss 134 forms an annular stop portion 135, which abuts against the surface of the conductive member 140 away from the battery cell 210. This arrangement prevents the adhesive from flowing from the tolerance gaps of the conductive member 140 to the top cover 230 of the battery cell 210, avoiding the adhesive from affecting the positive and negative electrodes of the battery cell 210 and improving product reliability.

[0041] In this embodiment, the second boss 134 can be installed into the third through hole 141 first to achieve the pre-positioning of the conductive component 140 and the mounting base 130, and then fixed by applying glue. This results in higher assembly efficiency and also helps to improve assembly accuracy.

[0042] Alternatively, please combine Figure 12In some other embodiments, when the sensor 125 is located on the side of the conductive element 140 away from the battery cell 210, the conductive element 140 is provided with a first mounting groove 143 and a second mounting groove 144. The second mounting groove 144 is located within the first mounting groove 143, and the depth of the second mounting groove 144 is greater than the depth of the first mounting groove 143. In other words, the second mounting groove 144 is formed at the bottom of the first mounting groove 143. The mounting base 130 is located in the first mounting groove 143, and the thermal pad 150 is located in the second mounting groove 144. A second clearance opening 145 is provided on the side of the conductive element 140 near the edge. The second clearance opening 145 is located within the first mounting groove 143 and connected to the second mounting groove 144. The second clearance opening 145 is used to avoid the sampling branch line 120. In this embodiment, the depth of the second mounting groove 144 is greater than the depth of the second clearance opening 145, and the depth of the second clearance opening 145 is greater than the depth of the first mounting groove 143. In this embodiment, the sensor 125 can collect temperature information of the conductive component 140 and indirectly reflect the temperature information of the battery cell 210. Specifically, during installation, the bottom surface of the mounting base 130 is adhesively mounted to the first mounting groove 143, and the second boss 134, sampling branch line 120, and thermal pad 150 are mounted in the second mounting groove 144. Adhesive is applied along the first through hole 131 and the second through hole 133 for fixation.

[0043] Optionally, the conductive element 140 is a busbar sheet, which can be made of aluminum or copper. The conductive element 140 serves as a connector 111 between multiple individual battery cells 210, enabling the multiple battery cells 210 to be connected in series or parallel.

[0044] Optionally, the circuit board body 110 adopts a flexible flat cable (FFC). The outer surface of the FFC is covered with a first insulating film. The first insulating film is made of PI film and provides protection for the FFC. The first insulating film has openings corresponding to the welding points between the circuit board body 110 and the welding part 124. Flexible flat cable (FFC) is a new type of data cable made by pressing PI film material and extremely thin tin-plated flat copper wire together using a high-tech automated production line. It has advantages such as flexibility, easy bending and folding, thinness, small size, simple connection, and convenient disassembly. The tin plating of the flat copper wire is to improve the oxidation resistance of the copper wire.

[0045] PI film, also known as polyimide film, is a yellow, semi-transparent film with excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance. PI film can be used long-term within a temperature range of -269℃ to 280℃. The PI film encapsulates FFC, providing antioxidant protection and structural protection.

[0046] A connector 111 is provided at the end of the circuit board body 110. The connector 111 is a piercing crimp connector. The working principle of the piercing crimp connector is an electrical connection device that pierces the cable insulation layer and forms a crimp connection with the conductor. It does not require pre-peeling the PI insulation film on the surface of the FFC. Simply insert the FFC terminal into the appropriate position of the terminal of the piercing crimp connector, and then use a special crimping tool to crimp the terminal to achieve the connection between the FFC and the piercing crimp connector.

[0047] This embodiment of the invention also provides a battery pack, including a battery cell 210 and a sampling component from any of the foregoing embodiments. The sampling component is disposed on the side of the battery cell 210 having a terminal post 220.

[0048] In summary, the sampling component and battery pack provided by this utility model embodiment have the following beneficial effects: The sampling branch line 120 is designed with a wavy first segment 1201, which can absorb the tensile force generated by the expansion displacement of the battery cell 210 by utilizing the wavy structure of the sampling branch line 120 itself. This effectively adapts to the displacement deviation caused by the thermal expansion of the battery cell 210 during charging and discharging, making the structure more reliable. Furthermore, it eliminates the need for additional energy-absorbing grooves for buffering, ensuring structural reliability, simplifying production processes, and improving production efficiency. In addition, in this sampling assembly, the sensor 125 can directly acquire the temperature information of the top cover 230 of the battery cell 210, resulting in higher temperature sampling accuracy. The conductive component 140 and the mounting base 130 can be pre-positioned and then bonded together with adhesive, which helps improve assembly efficiency and accuracy.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A sampling component, characterized in that, include: Circuit board body (110); A sampling branch line (120) is provided, one end of which is connected to the circuit board body (110), and the other end is configured to be connected to a conductive element (140). The sampling branch line (120) includes a wavy first segment (1201) which is located close to the conductive element (140) and is configured to absorb the tensile force caused by the expansion displacement of the battery cell (210). Mounting base (130), the mounting base (130) is connected to the conductive element (140); A sensor (125) is disposed on the mounting base (130) and electrically connected to the first segment (1201). The sensor (125) is configured to collect temperature information of the battery cell (210).

2. The sampling component according to claim 1, characterized in that, The sampling branch (120) further includes a second segment (1203) and a plurality of welding parts (124). The first segment (1201) and the second segment (1203) are connected. The second segment (1203) is provided with a plurality of window structures (1205) arranged along a second direction. The plurality of welding parts (124) are connected to the second segment (1203) and are respectively located in the window structure (1205). The welding parts (124) are connected to the circuit board body (110). The second direction is the width direction of the circuit board body (110).

3. The sampling component according to claim 2, characterized in that, The circuit board body (110) extends along a first direction, the first segment (1201) extends in a wave shape in a second direction, and the welding part (124) extends in a wave shape in the first direction, the first direction being the length direction of the circuit board body (110).

4. The sampling component according to claim 2, characterized in that, The sampling branch line (120) further includes a first connecting part (122) and a second connecting part (123) arranged opposite to each other along a first direction, wherein the first connecting part (122) and the second connecting part (123) are respectively connected to the welding part (124); the welding part (124) on the first connecting part (122) and the welding part (124) on the second connecting part (123) are arranged alternately; The welded portion (124) on the first connecting portion (122) extends along a first direction, and the extended end is at a predetermined distance from the second connecting portion (123); The welded portion (124) on the second connecting portion (123) extends in the opposite direction of the first direction, and the extended end is at a predetermined distance from the first connecting portion (122); The first connecting part (122) and the second connecting part (123) are respectively connected to the sensor (125).

5. The sampling component according to claim 1, characterized in that, The mounting base (130) is provided with a first through hole (131), and the sensor (125) is disposed in the first through hole (131); The mounting base (130) is bonded to the conductive element (140), which is configured to be welded to the terminal post (220) of the battery cell (210). The sensor (125) is located on the side of the conductive element (140) closer to the battery cell (210), or the sensor (125) is located on the side of the conductive element (140) away from the battery cell (210).

6. The sampling component according to claim 5, characterized in that, The mounting base (130) includes a first boss (137) and a second boss (134) stacked along a third direction. A first through hole (131) is formed inside the first boss (137) and the second boss (134). A second through hole (133) is also formed on the outer periphery of the first boss (137). A thermal pad (150) is provided on the side of the second boss (134) away from the first boss (137) along the third direction. The sampling branch line (120) is connected between the second boss (134) and the thermal pad (150). The third direction is the thickness direction of the circuit board body (110). Adhesive is applied to the first through hole (131) and the second through hole (133) to bond the mounting base (130) to the conductive element (140) and to enclose the sensor (125).

7. The sampling component according to claim 6, characterized in that, The mounting base (130) has an adhesive groove (136) on the side near the conductive element (140), and the adhesive groove (136) is connected to the second through hole (133).

8. The sampling component according to claim 6, characterized in that, When the sensor (125) is located on the side of the conductive member (140) close to the battery cell (210), the conductive member (140) is provided with a third through hole (141), the second boss (134) passes through the third through hole (141) to the side of the conductive member (140) close to the battery cell (210), and the conductive member (140) is provided with a first clearance opening (142) connected to the third through hole (141) on the side close to the edge. The first clearance opening (142) is used to avoid the sampling branch line (120). The size of the first boss (137) is larger than the size of the second boss (134). The first boss (137) extends horizontally to the area outside the second boss (134) to form an annular stop (135). The annular stop (135) abuts against the side surface of the conductive member (140) away from the battery cell (210). Alternatively, when the sensor (125) is located on the side of the conductive element (140) away from the battery cell (210), the conductive element (140) is provided with a first mounting groove (143) and a second mounting groove (144), the second mounting groove (144) is located in the first mounting groove (143), and the depth of the second mounting groove (144) is greater than the depth of the first mounting groove (143), the mounting base (130) is located in the first mounting groove (143), and the thermal pad (150) is located in the second mounting groove (144); The conductive element (140) has a second clearance opening (145) on one side near the edge. The second clearance opening (145) is located in the first mounting groove (143) and connected to the second mounting groove (144). The second clearance opening (145) is used to avoid the sampling branch line (120).

9. The sampling component according to any one of claims 1 to 8, characterized in that, The circuit board body (110) uses a flexible flat cable.

10. A battery pack, characterized in that, It includes a battery cell (210) and a sampling component according to any one of claims 1 to 9.

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