Signal acquisition components and battery pack

Abstract

This application relates to the field of power batteries, and in particular to a signal acquisition component and battery pack. The signal acquisition component includes a sampling main line, sampling branches, and a busbar. The sampling branches include: a first transmission line, with both ends used to connect the sampling main line and the busbar to transmit a first signal; a through hole is provided at the end of the first transmission line connected to the busbar to expose the busbar; a second transmission line is disposed adjacent to the first transmission line, and its two ends are used to connect the sampling main line and the busbar to transmit a second signal; a temperature sensor is provided at one end of the second transmission line, located at the through hole for connection to the busbar. The signal acquisition component provided in this application, by integrating the temperature sensor at the through hole in the first transmission line, can directly measure the temperature of the busbar without heat conduction through a nickel sheet, thus improving the accuracy of busbar temperature monitoring.

Description

Technical Field

[0001] This application relates to the field of power batteries, and in particular to a signal acquisition component and battery pack. Background Technology

[0002] To facilitate battery pack management and monitoring, it is necessary to monitor the voltage and temperature of the battery cells. In existing technologies, a flexible printed circuit board is used, connected to a nickel strip and the conductive busbars of the positive and negative terminals of the battery cell, to collect voltage signals. A thermistor is embedded in the nickel strip, and its temperature is measured by applying thermally conductive adhesive to collect the conductive busbar temperature signal. However, the heat transfer path for measuring the nickel strip temperature using the thermistor embedded in the nickel strip to obtain the conductive busbar temperature is too long, affecting the accuracy of conductive busbar temperature monitoring. Summary of the Invention

[0003] The purpose of this application is to provide a signal acquisition component and battery pack to solve the problem that the heat transfer path of the nickel sheet embedded in the thermistor for measuring the temperature of the nickel sheet as the temperature of the busbar is too long, which affects the accuracy of busbar temperature monitoring.

[0004] This application provides a signal acquisition component, including a sampling main line, sampling branches, and a busbar;

[0005] The sampling branch includes:

[0006] A first transmission line, wherein both ends of the first transmission line are used to connect the sampling main line and the conductive busbar to transmit a first signal of the first transmission line; a through hole is provided at the end of the first transmission line connected to the conductive busbar to expose the conductive busbar;

[0007] A second transmission line is disposed adjacent to the first transmission line, and its two ends are used to connect the sampling main line and the conductive busbar to transmit the second signal of the second transmission line; a temperature sensor is disposed at one end of the second transmission line, and the temperature sensor is located at the through hole to be connected to the conductive busbar.

[0008] In the above technical solution, the through hole is further located at the center of the connection between the first transmission line and the conductive busbar.

[0009] In the above technical solution, further, an insulating layer is provided on the side of the temperature sensor facing the conductive busbar, and the insulating layer is located inside the through hole;

[0010] The conductive busbar is provided with a glue storage tank, which is filled with a first thermally conductive adhesive to connect the insulating layer and the conductive busbar.

[0011] In the above technical solution, the temperature sensor is further provided with a second thermally conductive adhesive covering the through hole and filling the gap between the insulating layer and the through hole.

[0012] In the above technical solution, the second transmission line is further located beside the first transmission line;

[0013] The sampling branch also includes an insulating film, which wraps around the outside of part of the first transmission line and the second transmission line so that the sampling branch is integrally formed.

[0014] The insulating film has a hollow area formed between the second transmission line and the first transmission line.

[0015] In the above technical solution, the first transmission line further includes a first main body and a first connecting part, and a deformable part is provided on the side of the first main body near the first connecting part. The insulating film is wrapped around the outside of the first main body and the deformable part.

[0016] The insulating film has multiple window structures arranged sequentially along the length of the sampling branch at the position of the first main body, so that one of the window structures can be connected to the sampling main line; the first connecting part is connected to the conductive busbar; the deformable part has a curved extension path, and the extension path adopts a deformable "S" shaped structure.

[0017] The insulating film is provided with a buffer connection structure at the position where the deformed part is not connected to the first main body part, and at the two adjacent unconnected extension paths within the deformed part, so that the insulating film forms multiple hollow structures at the position of the deformed part, and the tensile strength of the buffer connection structure is less than the peel strength at the connection between the first connection part and the conductive busbar.

[0018] In the above technical solution, at least one fuse wire is further provided on the extension path of the deformed part.

[0019] In the above technical solution, the conductive busbar is further provided with a positioning groove, the positioning groove is adapted to the first connecting part, and the first connecting part is embedded in the positioning groove.

[0020] In the above technical solution, the second transmission line further includes multiple metal strips arranged sequentially along the width direction of the sampling branch. Each metal strip includes a second main body and a second connecting part and a third connecting part respectively connected to both ends of the second main body. The insulating film is wrapped around the outside of the second main body. The second connecting part is connected to the temperature sensor, and the third connecting part is connected to the sampling main line. The multiple third connecting parts are arranged sequentially along the length direction of the sampling branch at positions staggered from the window structure.

[0021] The second main body has a horizontally bent structure, and the part where the second main body fits into the conductive busbar has a curved structure that is adapted to the edge of the conductive busbar.

[0022] This application also provides a battery pack including the signal acquisition component described above.

[0023] Compared with the prior art, the beneficial effects of this application are as follows:

[0024] The signal acquisition component provided in this application can directly measure the temperature of the busbar by integrating a temperature sensor into the through hole of the first transmission line, without the need for heat conduction through the nickel sheet, thereby improving the accuracy of busbar temperature monitoring.

[0025] This application also provides a battery pack, including the signal acquisition component described in the above solution. Based on the above analysis, it is clear that the battery pack also possesses the aforementioned beneficial effects, which will not be elaborated upon further here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the signal acquisition component provided in this application;

[0028] Figure 2 A schematic diagram of the assembly structure of the sampling branch and the conductive bus provided in this application;

[0029] Figure 3 for Figure 2 Assembly explosion diagram;

[0030] Figure 4 A schematic diagram of the sampling branch provided in this application.

[0031] In the diagram: 101-Sampling main line; 102-Conductive busbar; 103-First transmission line; 104-Second transmission line; 105-Insulating film; 106-Through hole; 107-Temperature sensor; 108-Insulating layer; 109-Glue reservoir; 110-Second thermally conductive adhesive; 111-Hollowed area; 112-Positioning groove; 113-Second main body; 114-Bent arc structure; 115-Second connecting part; 116-First main body; 117-Deformable part; 118-First connecting part; 119-Buffer connection structure; 120-Window structure; 121-Third connecting part; 122-Hollowed structure; 124-Fuse wire; 125-Piercing crimp terminal. Detailed Implementation

[0032] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, 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. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] The data acquisition component is a crucial part of the battery pack, primarily comprising a pierced crimp terminal, a PI film, a conductive busbar, a vacuum-formed bracket, and a flexible flat cable (FFC). It is used to achieve high-voltage series and parallel connection of the battery cells, as well as battery temperature and cell voltage sampling. In this application, it transmits real-time cell voltage and temperature information from each cell in the battery module assembly to the Battery Management System (BMS) via the FFC, pierced crimp terminals, and sampling branches to monitor vehicle operating status. The main body of the FCC signal acquisition component is the flexible flat cable (FFC). A flexible printed circuit board (FPC) / flexible die-cut circuit board (FDC) is soldered onto the FFC through a window. Ultrasonic welding is performed between the FPC / FDC and the conductive busbar, replacing the laser welding of nickel sheets to the conductive busbar to achieve voltage acquisition requirements, realizing nickel-free voltage acquisition and reducing costs.

[0036] The working principle of piercing crimp 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 surface of the FFC. 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.

[0037] The conductive strip is a busbar, typically made of aluminum, which serves as a connector between individual battery cells, connecting them in series or parallel.

[0038] Flexible flat cable (FFC) is a 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 copper wire) through an automated production line. It has the advantages of being flexible, easy to bend and fold, thin, small in size, easy to connect and easy to disassemble.

[0039] 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. It can be used for extended periods within a temperature range of -269℃ to 280℃ (encapsulating FFC to prevent oxidation and protect its structure).

[0040] Example 1

[0041] See Figures 1 to 4As shown, the signal acquisition component provided in this application includes a sampling main line 101, sampling branches, and a conductive bus 102. The sampling main line 101 includes a pierced crimp terminal 125, a PI film, a conductive bus 102, a blister pack (not shown), and a flexible flat cable (FFC), used to realize high-voltage series and parallel connection of battery cells, as well as battery temperature sampling and cell voltage sampling functions. Through the FFC, the pierced crimp terminal 125, and the sampling branches, the voltage and temperature information of each cell in the battery module assembly are transmitted in real time to the battery management system for monitoring vehicle operating status.

[0042] Specifically, the sampling branch includes a first transmission line 103, the two ends of which are used to connect the sampling main line 101 and the busbar 102 to transmit the first signal of the first transmission line 103, namely a voltage signal. Specifically, the first transmission line 103 includes a metal sheet (e.g., a tin-plated copper plate), the shape of which is mainly formed by etching an FPC or die-cutting an FDC. The metal sheet of the first transmission line 103 can be laser-soldered with the flexible flat cable of the sampling main line 101, by applying solder paste to the flexible flat cable, melting it with laser heating, and then cooling and solidifying it. The metal sheet of the first transmission line 103 can be ultrasonically welded with the busbar 102 to reduce costs. The voltage signal can be transmitted through electrical connections at both ends to the sampling main line 101 and the busbar 102. A through hole 106 is provided at the end of the first transmission line 103 connected to the busbar 102, exposing the busbar 102 as the mounting position and temperature acquisition position of the temperature sensor 107.

[0043] The sampling branch also includes a second transmission line 104, which is adjacent to the first transmission line 103. Both ends of the second transmission line 104 are used to connect the sampling main line 101 and the busbar 102 to transmit a second signal, namely a temperature signal. Specifically, one end of the second transmission line 104 is laser-soldered to the flexible flat cable of the sampling main line 101. Solder paste is applied to the flexible flat cable, melted by laser heating, and then solidified upon cooling. The other end of the second transmission line 104 is equipped with a temperature sensor 107, located at the through-hole 106 for thermal connection with the busbar 102, to collect the temperature signal of the busbar and transmit it to the sampling main line 101.

[0044] The temperature sensor 107 is specifically a thermistor (NTC). An NTC 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. The temperature sensor 107 is integrated into the through hole 106 in the first transmission line 103, allowing direct measurement of the temperature of the busbar 102 without heat conduction through the nickel strip, thus improving the accuracy of temperature monitoring of the busbar 102.

[0045] In an optional embodiment, the through hole 106 is located at the center of the connection between the first transmission line 103 and the conductive bus 102.

[0046] In this embodiment, during the welding process between the metal sheet of the first transmission line 103 and the conductive bus 102, the heat generated may cause deformation of the parts. Designing the through hole 106 in the middle position can make the heat distribution more uniform, thereby reducing the problem of inaccurate temperature acquisition caused by welding deformation. Designing the through hole 106 in the middle position can also disperse stress, which helps to reduce stress concentration during welding and improve welding reliability.

[0047] In an optional embodiment, an insulating layer 108 is provided on the side of the temperature sensor 107 facing the conductive bus 102. Specifically, the insulating layer 108 is a PI film located within the through hole 106, providing insulation between the temperature sensor 107 and the conductive bus 102. Simultaneously, the insulating layer 108 can be connected to the first transmission line and can be connected around the through hole 106, thereby integrating the temperature sensor 107 and the first transmission line 103 into one unit. This fixes the temperature sensor 107 to the side with the through hole 106, preventing tearing between the second transmission line 104 and the temperature sensor 107 and the first transmission line 103. It also improves installation convenience, facilitating simultaneous installation of the acquisition ends of the first transmission line 103 and the second transmission line 104, thus improving installation efficiency. The conductive bus 102 is provided with a glue storage tank 109 filled with a first thermally conductive adhesive to connect the insulating layer 108 and the conductive bus 102. The temperature sensor 107 is attached to the through hole 106 with a first thermally conductive adhesive, allowing direct measurement of the temperature of the conductive busbar 102. A certain amount of thermally conductive structural adhesive is retained in the adhesive reservoir 109 on the conductive busbar 102, further increasing connection stability. During installation, the first thermally conductive adhesive can be directly placed in the adhesive reservoir 109, and then the first transmission line 103, along with the side of the temperature sensor 107 with the insulating layer 108, can be placed directly into the adhesive reservoir 109, thereby thermally connecting the temperature sensor 107 to the conductive busbar 102. This also serves as a pre-positioning mechanism for the first transmission line 103, facilitating subsequent welding of the first transmission line 103 to the conductive busbar 102.

[0048] In an optional embodiment, the temperature sensor 107 is wrapped with a second thermally conductive adhesive 110, which covers the through hole 106. Optionally, the second thermally conductive adhesive 110 can be provided on the side of the temperature sensor 107 away from the insulating layer 108. This protects the temperature sensor 107 from both sides while improving the reliability of the connection between the temperature sensor 107 and the first transmission line 103, preventing tearing or breakage of the second transmission line 104 and the temperature sensor 107. Optionally, when a gap is provided between the insulating layer 108 and the through hole 106, the second thermally conductive adhesive 110 can fill the gap between the insulating layer 108 and the through hole 106, thereby wrapping and covering the temperature sensor 107, providing insulation and protection. Furthermore, a certain amount of thermally conductive structural adhesive fills the gaps at the four corners of the PI film at the bottom of the temperature sensor 107, increasing the reliability and stability of the adhesion between the temperature sensor 107 and the conductive busbar 102.

[0049] In an optional embodiment, the second transmission line 104 is located beside the first transmission line 103, and the second transmission line 104 and the first transmission line 103 are interconnected. The end of the second transmission line 104, which is equipped with a temperature sensor 107, is located at the end of the first transmission line 103 near the conductive busbar 102, so that the temperature sensor 107 can be placed at the through hole 106 of the first transmission line 103. Furthermore, by placing the second transmission line 104 beside the first transmission line 103, i.e., by setting the first transmission line 103 and the second transmission line 104 in the width direction of the sampling branch, it is convenient to stagger the connection between the first transmission line 103 and the second transmission line 104 and the sampling main line 101. Moreover, the interconnection of the second transmission line 104 and the first transmission line 103 improves space utilization and facilitates the simultaneous installation of the second transmission line 104 and the first transmission line 103. In addition, it avoids the problem of easy tearing when the second transmission line 104 and the first transmission line 103 are set separately, thus improving the strength of the second transmission line 104 and the first transmission line 103.

[0050] The sampling branch also includes an insulating film 105, specifically a PI film, which wraps around a portion of the first transmission line 103 and the second transmission line 104 to form the sampling branch integrally. The insulating film 105 forms a hollow area 111 between the second transmission line 104 and the first transmission line 103, allowing the first and second transmission lines 103 and 104 to form relatively independent and deformable structures. Specifically, the insulating film 105 can simultaneously wrap around both sides of a portion of the first and second transmission lines 103 along the thickness direction of the first transmission line 103, providing insulation and protection for the first and second transmission lines 103. Furthermore, the first and second transmission lines 103 and 104 are arranged side-by-side along the width direction of the sampling branch, with a gap between them to form the hollow area 111. This allows the first and second transmission lines 103 and 104 to deform relatively independently, preventing deformation of one from causing the other to deform and break. Normally, if deformation occurs along the length of the sampling branch, both the first transmission line 103 and the second transmission line 104 require deformation space. The deformation space is increased by using the spaced-apart first transmission line 103 and second transmission line 104. If deformation occurs along the width of the sampling branch, the spaced-apart first transmission line 103 and second transmission line 104 can provide independent buffer spaces for the first transmission line 103 and the second transmission line 104, avoiding mutual interference and tearing.

[0051] In the optional scheme of this embodiment, refer to Figure 4 The first transmission line 103 includes a first main body 116 and a first connecting part 118. A deformable part 117 is provided on the side of the first main body 116 near the first connecting part 118. An insulating film 105 covers the exterior of the first main body 116 and the deformable part 117. The insulating film 105 has multiple window structures 120 arranged sequentially along the length of the sampling branch at the position of the first main body 116, so that one window structure 120 can be laser-soldered to the sampling main line 101. The insulating film 105 does not cover the first connecting part 118, making the first connecting part 118 an exposed conductive portion for ultrasonic welding to the busbar 102. Specifically, the window structure 120 can be a window in the insulating film 105 to expose the first main body 116 for welding to the sampling main line 101. In this design, flat conductors are arranged sequentially along the length of the sampling branch on the main sampling line 101. A window structure 120 is then connected to a corresponding flat conductor and welded to it, thus connecting the first transmission line 103 and the main sampling line 101. This configuration allows for the selection of any window structure and connection to any flat conductor as needed, enabling connections to different busbars 102 through the same sampling branch. This avoids the need for sampling branches with different structures, reducing costs.

[0052] The deformable portion 117 has a curved extension path, which adopts a deformable "S"-shaped structure. When the sampling branch is subjected to an external force, the deformable portion 117 can be pulled, causing it to deform and allowing the sampling branch to move relative to the sampling main line 101. This prevents the sampling branch from being unable to move relative to the sampling main line 101 when subjected to external forces, thus avoiding damage to the sampling branch. For example, if the external force also acts on the deformable portion 117 along the length and / or width direction of the sampling branch, the first connecting portion 118 can move relative to the sampling main line 101 along the length and / or width direction of the sampling branch through the "S"-shaped deformable portion 117, preventing the first transmission line 103 from breaking.

[0053] Specifically, refer again Figure 4 The insulating film 105 is provided with a buffer connection structure 119 at the position where the deformed part 117 is not connected to the first main body part 116, and at the two adjacent unconnected extension paths within the deformed part 117, so that the insulating film 105 forms a plurality of hollow structures 122 at the position of the deformed part 117. The tensile strength of the buffer connection structure 119 is less than the peel strength at the connection between the first connection part 118 and the conductive bus 102.

[0054] As shown in the figure, the PI film outside the first transmission line 103 is designed with three buffer connection structures 119. When the deformable part 117 of the first transmission line 103 is deformed by external force, and the first connecting part 118 and the first main body 116 are relatively displaced, the buffer connection structure 119 on the PI film can provide a certain force (the tensile strength of the buffer connection structure 119 is required to be less than the peel strength at the weld between the first connecting part 118 and the conductive bus 102) to play a buffer protection role, prevent the sampling branch from being deformed and broken by force, and improve the connection reliability between the deformable part 117 and the first main body 116 and the first connecting part 118 when no deformation occurs, so as to avoid the first main body 116, the first connecting part 118 and the deformable part 117 being easily torn during installation.

[0055] In an optional embodiment, at least one fuse 124 is provided on the extension path of the deformable portion 117.

[0056] In this embodiment, such as Figure 4 As shown, a thin, horizontally placed fuse 124 is etched into the deformed section 117 using an FPC or die-cut FDC. Its main function is overload protection. By placing the fuse 124 in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, allowing the BMS to quickly detect the voltage anomaly. The fuse 124 in the deformed section 117 also protects it, preventing it from tearing due to deformation.

[0057] In an optional embodiment, the conductive bus 102 is provided with a positioning groove 112, which is adapted to the first connecting part 118. The first connecting part 118 is embedded in the positioning groove 112 to facilitate the installation and positioning of the first connecting part 118. A through hole 106 is provided in the first connecting part 118, and a temperature sensor 107 is provided in the through hole 106. An insulating layer 108 is provided on the side of the through hole 106 facing the conductive bus 102, and a second thermally conductive adhesive 110 protects the side of the through hole 106 away from the conductive bus 102, thereby achieving the connection between the temperature sensor 107 and the first connecting part 118 and improving the reliability of the connection between the temperature sensor 107 and the first connecting part 118.

[0058] Example 2

[0059] The signal acquisition component in this second embodiment is an improvement on the above embodiments. The technical content disclosed in the above embodiments will not be described again, and the content disclosed in the above embodiments also belongs to the content disclosed in this second embodiment.

[0060] See Figure 4 As shown, in an optional embodiment, the second transmission line 104 includes multiple metal strips arranged sequentially along the width of the sampling branch. These metal strips can be tin-plated copper plates. Each metal strip includes a second main body 113 and a second connecting portion 115 and a third connecting portion 121 connected to both ends of the second main body 113. An insulating film 105 is wrapped around the outside of the second main body 113. The second connecting portion 115 is connected to the temperature sensor 107 and is encased in a second thermally conductive adhesive 110 to improve connection reliability. The third connecting portion 121 is connected to the sampling main line 101, and multiple third connecting portions 121 are arranged sequentially along the length of the sampling branch at positions offset from the window structure 120, for laser soldering connection to the flat conductor of the sampling main line 101. Specifically, multiple third connection parts 121 are arranged sequentially along the length of the sampling branch to connect with the flat conductors of the sampling main line 101 respectively, so as to realize the connection of the second transmission line 104; at the same time, the multiple third connection parts 121 can be staggered from the window structure 120 in the length of the sampling branch, so that the flat conductors of the sampling main line 101 can connect to the first transmission line 103 and the second transmission line 104 respectively, which facilitates the connection of the first transmission line 103 and the second transmission line 104 with the sampling main line 101, and also facilitates the wiring of the first transmission line 103 and the second transmission line 104.

[0061] Preferably, along the length of the sampling branch, a plurality of third connecting portions 121 are disposed at one end of a plurality of window structures 120 near the conductive busbar 102, thereby shortening the length of the second transmission line 104 and reducing the risk of tearing of the second transmission line 104. At the same time, the third connecting portions 121 and the window structures 120 are relatively far apart. Since the third connecting portions 121 and any window structure 120 are respectively connected to the sampling main line 101, the welding stress distribution of the sampling branch is improved, and stress concentration is avoided, which can easily cause the sampling branch to deform.

[0062] Optionally, the second main body 113 has a horizontally bent structure. Specifically, the second main body 113 is bent and connected to the second connecting part 115, and the second main body 113 is bent and connected to the third connecting part 121. This increases the spacing between the second main body 113 and the first transmission line 103, improves the buffer space of the second transmission line 104, and enhances the independence between the second transmission line 104 and the first transmission line 103, preventing mutual interference between them. Furthermore, the second main body 113 has a curved structure 114 at the point where it contacts the conductive busbar 102. The curved structure 114 adapts to the edge of the conductive busbar 102 to facilitate the positioning and installation of the second transmission line 104, and further increases the buffer space.

[0063] In this embodiment, the third connecting portion 121 and the first main body portion 116 are interconnected by an insulating film 105, thereby improving the connection reliability between the first transmission line 103 and the second transmission line 104. Furthermore, the multiple third connecting portions 121 have different extension lengths along the length direction of the sampling branch and bend along the width direction of the sampling branch, thereby allowing them to be connected to the flat conductors of the sampling main line 101 respectively along the length direction of the sampling branch, and increasing the connection area between the third connecting portions 121 and the first main body portion 116, further improving the connection reliability between the first transmission line 103 and the second transmission line 104.

[0064] In this case, the third connecting part 121 and the first main body part 116 can be provided with multiple welding holes at the positions corresponding to the window structure 120, so as to facilitate connection with the sampling main line 101 and improve welding reliability. The number and position of the welding holes can be set as needed, and there is no limitation here.

[0065] Example 3

[0066] This application provides a battery pack in embodiment three, which includes the signal acquisition component of any of the above embodiments. Therefore, it has all the beneficial technical effects of the signal acquisition component of any of the above embodiments, which will not be repeated here.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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 therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.

Claims

1. A signal acquisition component, characterized in that, It includes the sampling main line (101), sampling branches and conductor bus (102); The sampling branch includes: The first transmission line (103) has two ends for connecting the sampling main line (101) and the conductive bus (102) to transmit the first signal of the first transmission line (103); the end of the first transmission line (103) connected to the conductive bus (102) has a through hole (106) to expose the conductive bus (102). A second transmission line (104) is disposed adjacent to the first transmission line (103), and its two ends are used to connect the sampling main line (101) and the conductive bus (102) to transmit a second signal of the second transmission line (104); a temperature sensor (107) is disposed at one end of the second transmission line (104), and the temperature sensor (107) is located at the through hole (106) to be connected to the conductive bus (102); The second transmission line (104) is located beside the first transmission line (103); The sampling branch also includes an insulating film (105), which wraps around the outside of part of the first transmission line (103) and the second transmission line (104) to make the sampling branch integrally formed; The insulating film (105) has a hollow area (111) between the second transmission line (104) and the first transmission line (103). The first transmission line (103) includes a first main body (116) and a first connecting part (118). A deformable part (117) is provided on the side of the first main body (116) near the first connecting part (118). The insulating film (105) covers at least the outside of the first main body (116) and the deformable part (117). The insulating film (105) has a plurality of window structures (120) arranged sequentially along the length of the sampling branch at the position of the first main body (116), so that one of the window structures (120) can be connected to the sampling main line (101); the first connecting part (118) is connected to the conductive bus (102); the deformable part (117) has a curved extension path, and the extension path adopts a deformable "S" shaped structure; The insulating film (105) has a buffer connection structure (119) at the position where the deformed part (117) is not connected to the first main body part (116) and at the two adjacent unconnected extension paths within the deformed part (117), so that the insulating film (105) forms a plurality of hollow structures (122) at the position of the deformed part (117), and the tensile strength of the buffer connection structure (119) is less than the peel strength at the connection between the first connecting part (118) and the conductive bus (102).

2. The signal acquisition component according to claim 1, characterized in that, The through hole (106) is located at the center of the connection between the first transmission line (103) and the conductive bus (102).

3. The signal acquisition component according to claim 1, characterized in that, The temperature sensor (107) has an insulating layer (108) on the side facing the conductive bus (102), and the insulating layer (108) is located inside the through hole (106); The conductive bus (102) is provided with a glue storage tank (109), which is filled with a first thermally conductive adhesive to connect the insulating layer (108) and the conductive bus (102).

4. The signal acquisition component according to claim 3, characterized in that, The temperature sensor (107) is wrapped with a second thermally conductive adhesive (110), which covers the through hole (106) and fills the gap between the insulating layer (108) and the through hole (106).

5. The signal acquisition component according to claim 1, characterized in that, At least one fuse wire (124) is provided on the extension path of the deformable part (117).

6. The signal acquisition component according to claim 1, characterized in that, The conductive bus (102) is provided with a positioning groove (112), which is adapted to the first connecting part (118), and the first connecting part (118) is embedded in the positioning groove (112).

7. The signal acquisition component according to claim 5, characterized in that, The second transmission line (104) includes multiple metal strips arranged sequentially along the width direction of the sampling branch. Each metal strip includes a second main body (113) and a second connecting part (115) and a third connecting part (121) respectively connected to both ends of the second main body (113). The insulating film (105) is wrapped around the outside of the second main body (113). The second connecting part is connected to the temperature sensor (107). The third connecting part (121) is connected to the sampling main line (101). The multiple third connecting parts (121) are arranged sequentially along the length direction of the sampling branch at positions offset from the window structure (120). The second main body (113) has a horizontally bent structure, and the part where the second main body (113) fits against the conductive busbar (102) is provided with an arc structure (114), which is adapted to the edge of the conductive busbar (102).

8. A battery pack, characterized in that, Includes the signal acquisition component as described in any one of claims 1 to 7.

Images