Temperature sampling branch assembly and signal sampling system

Abstract

This utility model discloses a temperature sampling branch assembly and a signal sampling system, relating to the field of battery technology. The temperature sampling branch assembly includes a main body connecting part, a sampling connecting part, and a temperature sampling part. The two ends of the sampling connecting part are respectively connected to the main body connecting part and the temperature sampling part, and extend in a bent shape. A deformation notch is provided on the sampling connecting part, penetrating the sampling connecting part along its extension direction. Compared to existing technologies, this utility model, by extending the sampling connecting part in a bent shape, can absorb a certain amount of tensile force when the battery cell expands and shifts, thus providing a buffering effect. Furthermore, the deformation notch increases the flexibility of the deformation area, enhancing the sampling branch's ability to absorb the tensile force of the battery cell's expansion displacement. Therefore, it can prevent the temperature sampling branch assembly from detaching, ensuring the reliability of temperature sampling.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a temperature sampling branch assembly and a signal sampling system. Background Technology

[0002] To facilitate the BMS's thermal management strategy control of the battery pack, it is necessary to monitor the temperature of the battery cells in real time. Existing product solutions use flexible printed circuit boards (FPCs) as the main circuit board for information sampling. The NTC is placed in the nickel strip groove with thermally conductive structural adhesive to detect the temperature of the busbar. However, the battery cells expand in volume during charging and discharging, resulting in a large expansion displacement. This causes the sampling branches to be subjected to peeling forces and easily detach from the sampling circuit board. Utility Model Content

[0003] The purpose of this invention is to provide a temperature sampling branch assembly and a signal sampling system that can absorb the tensile force caused by the expansion displacement of the battery cell, prevent the sampling branch from falling off, and ensure the reliability of temperature sampling.

[0004] The embodiments of this utility model are implemented as follows:

[0005] In one aspect, this utility model provides a temperature sampling branch assembly, including a main body connecting part, a sampling connecting part, and a temperature sampling part. The main body connecting part is used to connect with the sampling main body, and the temperature sampling part is used to connect with the conductive busbar on the battery cell to collect the temperature of the conductive busbar. The two ends of the sampling connecting part are respectively connected to the main body connecting part and the temperature sampling part, and extend in a bent shape. The sampling connecting part is provided with a deformation notch, which penetrates the sampling connecting part along the extension direction of the sampling connecting part.

[0006] In an optional embodiment, the sampling connection part includes a first sampling line and a second sampling line laid flat, with the two ends of the first sampling line and the second sampling line respectively connected to the main body connection part and the temperature sampling part, and a deformation gap is formed between the first sampling line and the second sampling line.

[0007] The main body connection part includes a first main body conductive sheet and a second main body conductive sheet that are laid flat and arranged side by side. The first main body conductive sheet and the second main body conductive sheet are respectively connected to the first sampling line and the second sampling line. The first main body conductive sheet and the second main body conductive sheet are used to connect the sampling body.

[0008] In an optional embodiment, the surfaces of the first sampling line, the second sampling line, the first main conductive sheet, and the second main conductive sheet are all covered with an insulating layer, and the insulating layer between the first sampling line and the second sampling line penetrates to form a deformation gap.

[0009] In an optional embodiment, the insulating layer on the surface of the first main conductive sheet and the second main conductive sheet is further provided with a first welding window and a second welding window that respectively expose the first main conductive sheet and the second main conductive sheet.

[0010] The first welding window and the second welding window are respectively spaced apart along the first direction, and the projections of the first welding window and the second welding window perpendicular to the first direction do not overlap.

[0011] In an optional embodiment, the sampling connection portion is Z-shaped or N-shaped, and the temperature sampling portion and the main body connection portion are misaligned along the first direction, so that the sampling connection portion can absorb the displacement of the temperature sampling portion relative to the main body connection portion in the first and second directions, the first direction being the extension direction of the main body connection portion, and the first and second directions being perpendicular to each other.

[0012] In an optional embodiment, the temperature sampling unit includes a temperature-sensing resistor, an insulating connector, and a reinforcing plate. The insulating connector is used to connect to the conductive busbar and is provided with a dispensing groove. The temperature-sensing resistor is disposed in the dispensing groove, and the dispensing groove is filled with a first adhesive layer. The first adhesive layer covers the temperature-sensing resistor. The sampling connector is connected to one side surface of the temperature-sensing resistor. The reinforcing plate covers the dispensing groove and is simultaneously bonded to the sampling connector and the temperature-sensing resistor, so that the sampling connector and the temperature-sensing resistor are connected and fixed.

[0013] In an optional embodiment, the insulating connector is further provided with a glue-applying groove, which surrounds the glue-applying groove and penetrates the insulating connector. The glue-applying groove is filled with a second glue layer, and the insulating connector is bonded to the conductive busbar through the second glue layer.

[0014] In an optional embodiment, adhesive storage tanks are also provided on both sides of the insulating connector. The adhesive storage tanks are connected to the adhesive application tank and are used to accommodate part of the second adhesive layer.

[0015] In an optional embodiment, the insulating connector is further provided with riveting posts located on both sides of the dispensing groove for heat-riveting fixation to the conductive busbar.

[0016] On the other hand, this utility model embodiment provides a signal sampling system, including a sampling body, a conductive busbar, multiple battery cells and the aforementioned temperature sampling branch assembly. The conductive busbar is connected to the terminal post of the battery cell, and a mounting groove is provided on the conductive busbar. The temperature sampling part is correspondingly accommodated in the mounting groove and is thermally connected to the conductive busbar. The main body connection part is connected to the sampling body, and the sampling body is a flexible flat cable.

[0017] The beneficial effects of this utility model embodiment are:

[0018] The temperature sampling branch assembly provided in this embodiment connects the main body connecting part to the sampling body, and the temperature sampling part is connected to the conductive busbar. The two ends of the sampling connecting part are respectively connected to the main body connecting part and the temperature sampling part, extending in a bent shape. A deformation notch is also provided on the sampling connecting part, which can penetrate the sampling connecting part along its extension direction. Compared with the prior art, this invention, by extending the sampling connecting part in a bent shape, can absorb a certain amount of tensile force when the battery cell expands and shifts, thus playing a buffering role. Furthermore, the deformation notch also increases the flexibility of the deformation area, enhancing the sampling branch's ability to absorb the tensile force of the battery cell's expansion displacement. Therefore, it can prevent the temperature sampling branch assembly from detaching, ensuring the reliability of temperature sampling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the temperature sampling branch assembly provided in an embodiment of the present invention from a first-view perspective;

[0021] Figure 2 A schematic diagram of the temperature sampling branch assembly provided in this embodiment of the present invention from a second perspective;

[0022] Figure 3 An exploded view of the temperature sampling branch assembly provided in an embodiment of this utility model;

[0023] Figure 4 A schematic diagram of the assembly of the temperature sampling branch assembly and the conductive bus provided for an embodiment of this utility model;

[0024] Figure 5 for Figure 3 Schematic diagram of the structure of the insulated connector;

[0025] Figure 6 A schematic diagram of the assembly of the temperature sampling branch assembly and the conductive busbar provided for another embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a signal sampling system provided in an embodiment of this utility model.

[0027] icon:

[0028] 100-Temperature sampling branch assembly; 110-Main body connection part; 111-First main body conductive sheet; 112-Second main body conductive sheet; 130-Sampling connection part; 131-First sampling line; 132-Second sampling line; 150-Temperature sampling part; 151-Temperature sensing resistor; 152-Insulating connector; 153-Reinforcing plate; 154-Dispensing groove; 155-First adhesive layer; 156-Dispensing groove; 157-Acrylic storage groove; 158-Riveting post; 159-Second adhesive layer; 170-Deformation notch; 190-Insulating layer; 191-First welding window; 192-Second welding window; 200-Signal sampling system; 210-Sampling body; 230-Conductive busbar; 231-Mounting groove. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Furthermore, terms such as "horizontal" and "vertical" 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 than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0034] 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.

[0035] As disclosed in the background section, in existing technologies, NTC (thermistor) is placed directly in a nickel strip groove using thermally conductive adhesive to detect the temperature of the busbar. Because the battery cell expands during charging and discharging, resulting in significant displacement, this displacement can cause the sampling branch to be subjected to peeling forces, making it prone to detaching from the sampling circuit board. Consequently, the sampling component cannot properly perform its information acquisition function.

[0036] The inventors' research revealed that in existing FPC products, because the NTC is placed inside the nickel plate groove, the heat transfer path is sequentially: conductive busbar, nickel plate, thermally conductive structural adhesive, and NTC. This results in a long heat transfer path, high thermal resistance, low temperature accuracy, and distorted temperature detection.

[0037] To address the aforementioned problems, this utility model provides a novel temperature sampling branch assembly and signal sampling system. The specific structure and working principle of the temperature sampling branch assembly are described in detail below.

[0038] See Figure 1 This utility model embodiment provides a temperature sampling branch assembly 100, which can absorb the tensile force caused by the expansion displacement of the battery cell, preventing the sampling branch from falling off and ensuring the reliability of temperature sampling. At the same time, it can reduce thermal resistance and improve the accuracy of temperature monitoring.

[0039] The temperature sampling branch assembly 100 provided in this embodiment of the utility model includes a main body connecting part 110, a sampling connecting part 130 and a temperature sampling part 150. The main body connecting part 110 is used to connect with the sampling main body 210, and the temperature sampling part 150 is used to connect with the conductive busbar 230 on the battery cell to collect the temperature of the conductive busbar 230. The two ends of the sampling connecting part 130 are respectively connected to the main body connecting part 110 and the temperature sampling part 150 and extend in a bent shape. A deformation notch 170 is provided on the sampling connecting part 130, and the deformation notch 170 penetrates the sampling connecting part 130 along the extension direction of the sampling connecting part 130.

[0040] It should be noted that, in conjunction with the above, Figure 7 The sampling body 210 here can be an integrated busbar, which is an important component of the battery pack. It mainly includes a piercing crimp connector, a PI film, a conductive busbar 230, a bracket, and an information acquisition circuit board (such as a flexible flat cable (FFC), a flexible die-cut circuit board (FDC), or a flexible printed circuit board (FPC)). This is used to realize high-voltage series and parallel connection of the battery cells, as well as temperature and voltage sampling of the cells. In this embodiment, the integrated busbar provides cell temperature information and transmits it to the battery management system (BMS) through the FFC, the piercing crimp connector, and the temperature sampling branch assembly, thereby enabling monitoring of the vehicle's operating status. The main body of the integrated busbar is a flexible flat cable (FFC), with a window opened on the FFC and the main body connection part 110 laser-welded. The structure and working principle of the integrated busbar can be referenced from existing integrated busbar structures.

[0041] This embodiment of the invention extends the sampling connection 130 in a bent shape. When the battery cell expands and shifts, the bent sampling connection 130 can absorb a certain amount of tensile force through deformation, thus playing a buffering role. Furthermore, the deformation notch 170 increases the flexibility of the deformation area. Stress will preferentially concentrate in the deformation notch 170 area, inducing deformation (such as bending or torsion) to mainly occur at the deformation notch 170, thus limiting the deformation to a specific area. This enhances the ability of the sampling branch to absorb the tensile force of the battery cell's expansion displacement, thereby preventing the temperature sampling branch assembly 100 from detaching and ensuring the reliability of temperature sampling.

[0042] See Figure 2In some embodiments, the sampling connection portion 130 includes a first sampling line 131 and a second sampling line 132 laid flat. The two ends of the first sampling line 131 and the second sampling line 132 are respectively connected to the main body connection portion 110 and the temperature sampling portion 150. A deformation notch 170 is formed between the first sampling line 131 and the second sampling line 132. Specifically, both the first sampling line 131 and the second sampling line 132 extend in a bent shape, allowing them to deform synchronously when stretched, thereby absorbing the tensile force. Simultaneously, the extension directions of the first sampling line 131 and the second sampling line 132 are parallel to each other, and they are arranged adjacently to form a deformation notch 170. The size of this deformation notch 170 can change during the stress process, thereby absorbing the tensile force and achieving buffering. By guiding the deformation to occur in a controllable deformation notch 170 area, the connection between the temperature sampling portion 150 and the conductive busbar 230, as well as the solder joint between the main body connection portion 110 and the sampling body 210, are protected. These two locations are most prone to fatigue cracking or detachment due to stress concentration. Therefore, the deformation notch 170 significantly improves the reliability of the first sampling line 131 and the second sampling line 132 under long-term vibration and cell expansion. Furthermore, the deformation notch 170 also enables separation between the first sampling line 131 and the second sampling line 132, preventing them from interfering with each other under stress.

[0043] Furthermore, the main body connecting portion 110 includes a first main body conductive sheet 111 and a second main body conductive sheet 112 arranged side by side. The first main body conductive sheet 111 and the second main body conductive sheet 112 are respectively connected to the first sampling line 131 and the second sampling line 132. The first main body conductive sheet 111 and the second main body conductive sheet 112 are used to connect the sampling body 210. Specifically, the first main body conductive sheet 111 and the second main body conductive sheet 112 are both rectangular sheets and are welded and fixed on the sampling body 210. The first main body conductive sheet 111 and the first sampling line 131 can be an integral conductive structure, and the second main body conductive sheet 112 and the second sampling line 132 can be an integral conductive structure. For example, the first main body conductive sheet 111 and the second main body conductive sheet 112 can both be made of copper sheets.

[0044] In some embodiments, the surfaces of the first sampling line 131, the second sampling line 132, the first main conductive sheet 111, and the second main conductive sheet 112 are all covered with an insulating layer 190, and the insulating layer 190 between the first sampling line 131 and the second sampling line 132 penetrates to form a deformation gap 170. Specifically, the insulating layer 190 is a PI film, also known as a polyimide film, which is yellow and semi-transparent, and has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance. It can be used for a long time in a temperature range of -269℃ to 280℃. This PI film can cover the first sampling line 131, the second sampling line 132, the first main conductive sheet 111, and the second main conductive sheet 112 respectively. Through the covering of the insulating material, short circuits can be prevented between the first sampling line 131 and the second sampling line 132, and between the first main conductive sheet 111 and the second main conductive sheet 112, ensuring electrical safety.

[0045] It should be noted that the insulating layer 190 covering the first main conductive sheet 111 and the second main conductive sheet 112 can be integrally formed to create an integral main body connection part 110, which facilitates its corresponding welding onto the sampling body 210, simplifies the process, and reduces manufacturing costs.

[0046] In some embodiments, the insulating layer 190 on the surfaces of the first main conductive sheet 111 and the second main conductive sheet 112 is further provided with a first welding window 191 and a second welding window 192 respectively exposing the first main conductive sheet 111 and the second main conductive sheet 112. The first welding window 191 and the second welding window 192 are respectively spaced apart along a first direction, and the projections of the first welding window 191 and the second welding window 192 perpendicular to the first direction do not overlap, which helps to improve the strength of the main body connection portion 110 and simplify its manufacturing. Specifically, the first welding window 191 can at least partially expose the surface of the first main conductive sheet 111, and the second welding window 192 can at least partially expose the surface of the second main conductive sheet 112. In actual welding, the first main conductive sheet 111 and the second main conductive sheet 112 can be welded and fixed to the sampling body 210 through the first welding window 191 and the second welding window 192. After the solder paste melts, it will overflow from the window, and the overflowing solder paste can facilitate the monitoring of welding quality and facilitate welding fixation.

[0047] Furthermore, the sampling connection portion 130 is Z-shaped or N-shaped to provide more buffer margin, and the temperature sampling portion 150 and the main body connection portion 110 are staggered along the first direction so that the sampling connection portion 130 can absorb the displacement of the temperature sampling portion 150 relative to the main body connection portion 110 in the first and second directions. The first direction is the extension direction of the main body connection portion 110, and the first and second directions are perpendicular to each other. The sampling connection 130 is bent with a staggered arrangement. Specifically, the sampling connection 130 is bent into a Z-shape or N-shape, and the temperature sampling part 150 and the main body are staggered. This increases the effective distance (lever arm) from the stress point to the connection between the temperature sampling part 150 and the conductive busbar 230, as well as the welding point between the main body connection 110 and the sampling body 210. This reduces the torque transmitted to these two points and transforms the force that would cause these two points to be subjected to direct shear or pull-out into a force that causes the sampling connection 130 to bend flexibly. This more effectively absorbs expansion displacement and vibration displacement from different directions (up and down, left and right, and even torsional direction), effectively improves the buffering capacity, and significantly enhances the adaptability of the sampling connection 130 to complex, multi-directional mechanical stress and expansion force. Meanwhile, because the sampling connection 130 has a deformation notch 170, stress is highly concentrated at the deformation notch 170, ensuring that deformation occurs at the notch and avoiding random deformation at easily tearable locations (such as the connection between the temperature sampling part 150 and the conductive busbar 230, and the weld points between the main body connection 110 and the sampling body 210). This also increases the flexibility of the deformation area, thereby enhancing the ability of the sampling connection 130 to absorb the tensile force of cell expansion displacement, making the sampling connection 130 more durable under repeated deformation. Furthermore, given the compact internal space of the battery pack, there may be manufacturing or assembly tolerances in the positions of the conductive busbar 230 and the sampling body 210. The staggered arrangement of the temperature sampling part 150 and the main body connection 110 can tolerate these tolerances, simplifying the assembly process, improving production efficiency and yield, and enhancing design flexibility.

[0048] See Figures 3 to 5In some embodiments, the temperature sampling unit 150 includes a temperature-sensing resistor 151, an insulating connector 152, and a reinforcing plate 153. The insulating connector 152 is used to connect to the conductive busbar 230 and is provided with a dispensing groove 154. The temperature-sensing resistor 151 is disposed in the dispensing groove 154, and the dispensing groove 154 is filled with a first adhesive layer 155, which covers the temperature-sensing resistor 151. The sampling connection part 130 is connected to one side surface of the temperature-sensing resistor 151. The reinforcing plate 153 covers the dispensing groove 154 and is simultaneously bonded to the sampling connection part 130 and the temperature-sensing resistor 151, so that the sampling connection part 130 and the temperature-sensing resistor 151 are connected and fixed. The temperature-sensing resistor 151 is a thermistor (NTC), which 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 decreases, the resistance increases. The insulating connector 152 can be made of plastics such as polyethylene or polypropylene. It is bonded to the sampling connection part 130 through the first adhesive layer 155, serving to connect the conductive bus 230 and protect the thermistor. The bottom surface of the insulating connector 152 is bonded to the sampling connection part 130 and the reinforcing plate 153 in sequence through the first adhesive layer 155. The reinforcing plate 153 can be an epoxy board, which serves as a structural reinforcement solution.

[0049] Furthermore, the insulating connector 152 is also provided with a glue-applying groove 156, which is arranged around the glue-applying groove 154 and penetrates the insulating connector 152. The glue-applying groove 156 is filled with a second glue layer 159, and the insulating connector 152 is bonded to the conductive busbar 230 through the second glue layer 159. Specifically, the glue-applying groove 156 is inverted concave in shape and is arranged around the glue-applying groove 154. The glue-applying groove 156 is filled with a second glue layer 159, which can fix the insulating connector 152 to the conductive busbar 230.

[0050] It should be noted that the first adhesive layer 155 is formed by dispensing adhesive into the dispensing groove 154. This first adhesive layer 155 is a UV quick-drying adhesive, which can coat the NTC and provide protection. The second adhesive layer 159 is formed by dispensing adhesive into the adhesive layer around the dispensing groove 154. This second adhesive layer 159 can be an acrylic quick-drying adhesive, which can connect the conductive busbar 230 and the insulating connector 152, improving the stability of the connection. The advantages of designing the "inverted concave" type dispensing groove 156 are twofold: 1. Acrylic adhesives have high bonding strength, but they release a large amount of heat during curing. Simultaneously, substances in the components may react with the NTC, damaging it. To avoid this, the second adhesive layer 159 (acrylic quick-drying adhesive) for fixing is separated from the first adhesive layer 155 (UV fast-drying adhesive) protecting the NTC, ensuring they do not interfere with each other and fundamentally preventing NTC damage, thus reducing production risks. 2. The "inverted concave" shaped dispensing groove 156 acts as a dispensing fixture, planning the dispensing route for fixing the insulating connector 152. The glue gun only needs to run around the perimeter of the dispensing groove 156 to meet the fixing requirements, facilitating control over dispensing consistency and glue quantity. Existing production lines apply glue directly to the NTC surface. Due to significant human error, sometimes too much glue is applied, resulting in excessive flow; other times too little glue is applied, requiring reapplication. This repetitive dispensing action reduces production efficiency. The design of the dispensing groove 156 improves dispensing efficiency.

[0051] In some embodiments, the insulating connector 152 is further provided with adhesive storage grooves 157 on both sides of its edges. The adhesive storage grooves 157 are connected to the adhesive application groove 156 and are used to accommodate a portion of the second adhesive layer 159. Specifically, the conductive bus 230 is designed with an installation groove 231, and the reinforcing plate 153 is pasted into the installation groove 231 for pre-fixation. The insulating connector 152 can be designed with grooves on both sides as adhesive storage grooves 157. When acrylic quick-drying adhesive is applied along the adhesive application groove 156, some adhesive will fill into the adhesive storage grooves 157, storing a portion of the adhesive, increasing the bonding strength with the conductive bus 230, and improving the connection stability. The temperature sampling unit 150 is fixed to the conductive bus 230 by the acrylic quick-drying adhesive to monitor the temperature of the conductive bus 230.

[0052] See Figure 6In other preferred embodiments of this invention, the insulating connector 152 is further provided with riveting posts 158, which are located on both sides of the glue dispensing groove 154 and are used for heat-riveting to fix it to the conductive busbar 230. Specifically, the conductive busbar 230 can be designed with mounting grooves 231, and the insulating connector 152 is designed with riveting posts 158 on both sides. The riveting posts 158 pass through the holes on the upper surface of the conductive busbar 230. At this time, the insulating connector 152 is installed in the mounting groove 231. Then, using heat riveting technology, the riveting posts 158 protruding from the lower surface of the conductive busbar 230 are processed to form mushroom heads after heat riveting, which fix the temperature sampling part 150 and the conductive busbar 230. This design can eliminate the design of the glue dispensing groove 156 and the glue storage groove 157, simplifying the structure of the insulating connector 152.

[0053] See Figure 7 This utility model embodiment also provides a signal sampling system 200, including a sampling body 210, a conductive busbar 230, multiple battery cells and the aforementioned temperature sampling branch assembly 100. The conductive busbar 230 is connected to the terminal post of the battery cell, and a mounting groove 231 is provided on the conductive busbar 230. The temperature sampling part 150 is correspondingly accommodated in the mounting groove 231 and is thermally connected to the conductive busbar 230. The main body connecting part 110 is connected to the sampling body 210, and the sampling body 210 is a flexible flat cable.

[0054] Furthermore, one end of the flexible flat cable is provided with a piercing crimp connector, the surface of the flexible flat cable is covered with an insulating film, and the main connecting part 110 is connected to the flexible flat cable.

[0055] It should be noted that the working principle of the piercing crimp connector here 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 film protective layer on the FFC surface; simply insert the FFC terminal into the appropriate position of the pierced crimp terminal, and then use a special crimping tool to crimp the terminal to achieve the connection between the FFC and the terminal. The 230 conductive busbar, also known as a Busbar strip, is generally made of aluminum and serves as a connector between battery cells, acting as a series / parallel connection for the cells. Flexible flat cable (FFC) is a new type of data cable made by pressing together PI film insulation material and extremely thin tin-plated flat copper wire (tin plating improves the oxidation resistance of the copper wire) using high-tech automated production lines. It has advantages such as flexibility, easy bending and folding, thinness, small size, simple connection, and convenient disassembly. Furthermore, changing the conventional sampling scheme from FPC to FFC simplifies the process, reduces pollution, and lowers costs.

[0056] In summary, the temperature sampling branch assembly 100 provided in this embodiment connects the main body connecting portion 110 to the sampling main body 210, and the temperature sampling portion 150 to the conductive bus 230. The sampling connecting portion 130 has its two ends connected to the main body connecting portion 110 and the temperature sampling portion 150 respectively, and extends in a bent shape. A deformation notch 170 is also provided on the sampling connecting portion 130, which can penetrate the sampling connecting portion 130 along its extension direction. Compared to the prior art, this invention, by extending the sampling connecting portion 130 in a bent shape, can absorb a certain amount of tensile force when the battery cell expands and shifts, thus playing a buffering role. Furthermore, the deformation notch 170 also increases the flexibility of the deformation area, enhancing the sampling branch's ability to absorb the tensile force of the battery cell's expansion displacement. Therefore, it can prevent the temperature sampling branch assembly 100 from detaching, ensuring the reliability of temperature sampling. Meanwhile, by adhesive bonding or hot riveting, the insulating connector 152 and the conductive busbar 230 can shorten the heat transfer path, reduce thermal resistance, and improve temperature accuracy.

[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A temperature sampling branch assembly, characterized in that, It includes a main body connecting part (110), a sampling connecting part (130) and a temperature sampling part (150). The main body connecting part (110) is used to connect to the sampling main body (210), and the temperature sampling part (150) is used to connect to the conductive bus (230) on the battery cell to collect the temperature of the conductive bus (230). The two ends of the sampling connecting part (130) are respectively connected to the main body connecting part (110) and the temperature sampling part (150) and extend in a bent shape. A deformation notch (170) is provided on the sampling connecting part (130), and the deformation notch (170) penetrates the sampling connecting part (130) along the extension direction of the sampling connecting part (130).

2. The temperature sampling branch assembly according to claim 1, characterized in that, The sampling connection part (130) includes a first sampling line (131) and a second sampling line (132) laid flat. The two ends of the first sampling line (131) and the second sampling line (132) are respectively connected to the main body connection part (110) and the temperature sampling part (150). The deformation gap (170) is formed between the first sampling line (131) and the second sampling line (132). The main body connection part (110) includes a first main body conductive sheet (111) and a second main body conductive sheet (112) that are laid flat and arranged side by side. The first main body conductive sheet (111) and the second main body conductive sheet (112) are respectively connected to the first sampling line (131) and the second sampling line (132). The first main body conductive sheet (111) and the second main body conductive sheet (112) are used to connect the sampling body (210).

3. The temperature sampling branch assembly according to claim 2, characterized in that, The surfaces of the first sampling line (131), the second sampling line (132), the first main conductive sheet (111), and the second main conductive sheet (112) are all covered with an insulating layer (190), and the insulating layer (190) between the first sampling line (131) and the second sampling line (132) penetrates to form the deformation gap (170).

4. The temperature sampling branch assembly according to claim 3, characterized in that, The insulating layer (190) on the surface of the first main conductive sheet (111) and the second main conductive sheet (112) is further provided with a first welding window (191) and a second welding window (192) respectively exposing the first main conductive sheet (111) and the second main conductive sheet (112). The first welding window (191) and the second welding window (192) are respectively spaced apart along the first direction, and the projections of the first welding window (191) and the second welding window (192) perpendicular to the first direction do not overlap.

5. The temperature sampling branch assembly according to any one of claims 1-4, characterized in that, The sampling connection part (130) is Z-shaped or N-shaped and along the first direction, the temperature sampling part (150) and the main body connection part (110) are misaligned so that the sampling connection part (130) can absorb the displacement of the temperature sampling part (150) relative to the main body connection part (110) in the first direction and the second direction. The first direction is the extension direction of the main body connection part (110), and the first direction and the second direction are perpendicular to each other.

6. The temperature sampling branch assembly according to claim 1, characterized in that, The temperature sampling unit (150) includes a temperature-sensing resistor (151), an insulating connector (152), and a reinforcing plate (153). The insulating connector (152) is used to connect the conductive busbar (230) and is provided with a dispensing groove (154). The temperature-sensing resistor (151) is disposed in the dispensing groove (154), and the dispensing groove (154) is filled with a first adhesive layer (155). The first adhesive layer (155) covers the temperature-sensing resistor (151). The sampling connection part (130) is connected to one side surface of the temperature-sensing resistor (151). The reinforcing plate (153) covers the dispensing groove (154) and is simultaneously bonded to the sampling connection part (130) and the temperature-sensing resistor (151) so that the sampling connection part (130) and the temperature-sensing resistor (151) are connected and fixed.

7. The temperature sampling branch assembly according to claim 6, characterized in that, The insulating connector (152) is also provided with a glue-applying groove (156), which surrounds the glue-applying groove (154) and penetrates the insulating connector (152). The glue-applying groove (156) is filled with a second glue layer (159), and the insulating connector (152) is bonded to the conductive busbar (230) through the second glue layer (159).

8. The temperature sampling branch assembly according to claim 7, characterized in that, The insulating connector (152) is also provided with glue storage tanks (157) on both sides of its edges. The glue storage tanks (157) are connected to the glue application tank (156) and are used to accommodate part of the second glue layer.

9. The temperature sampling branch assembly according to claim 6, characterized in that, The insulating connector (152) is also provided with a riveting post (158), which is located on both sides of the dispensing groove (154) and is used for hot riveting to fix it on the conductive busbar (230).

10. A signal sampling system, characterized in that, The device includes a sampling body (210), a conductive busbar (230), multiple battery cells, and a temperature sampling branch assembly as described in any one of claims 1-9. The conductive busbar (230) is connected to the terminal of the battery cell, and the conductive busbar (230) is provided with a mounting groove (231). The temperature sampling part (150) is correspondingly accommodated in the mounting groove (231) and is thermally connected to the conductive busbar (230). The main body connecting part (110) is connected to the sampling body (210), and the sampling body (210) is a flexible flat cable.

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