Integrated busbar and battery pack

Abstract

The application relates to the battery technical field and discloses an integrated busbar and a battery pack. The integrated busbar comprises an isolation plate, a signal acquisition element, a fixing assembly, a circuit board and a gasket. The isolation plate is provided with a through hole. The circuit board and the gasket are arranged on the side of the isolation plate away from the battery cell, the circuit board has an extension part, and the extension part is located in the through hole. The signal acquisition element is arranged on the extension part, the signal acquisition element is electrically connected with the extension part, and the extension part is arranged on the battery cell through the through hole. The fixing assembly is connected with the gasket, and the extension part is fixed in the through hole through the fixing assembly. According to the application, the extension part provided with the signal acquisition element can stably pass through the through hole and keep contact with the surface of the battery cell, so that the thermal resistance of the heat transfer path and the contact uncertainty are reduced, and the accuracy and response speed of temperature acquisition are ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an integrated busbar and battery pack. Background Technology

[0002] As a key component of battery packs, CCS (Cell Contact System) modules are constantly evolving towards lighter weight, thinner profiles, and lower costs. Their main materials are gradually shifting from traditional injection-molded parts to thermoformed parts. This technological change effectively reduces module thickness and weight, further compressing production costs and supporting improvements in the overall performance of the battery pack.

[0003] In related technologies, temperature acquisition elements are usually directly mounted or fixed to the surface of the CCS blister pack or in a reserved structural position. Temperature transfer is achieved through contact or indirect heat conduction between the blister pack itself and the top cover of the battery cell. The structure is relatively simple and facilitates modular installation together with the busbar and sampling line, which is in line with the overall concept of integrated CCS components.

[0004] However, due to the poor thermal conductivity of the thermoformed material and the presence of multiple assembly interfaces and air gaps between the temperature acquisition element and the top cover of the battery cell, there is high thermal resistance and significant delay in the actual heat transfer path. This results in the temperature acquisition element being unable to accurately and timely reflect the true temperature of the battery cell, affecting the timely assessment of thermal safety risks. Utility Model Content

[0005] This application provides an integrated busbar and battery pack to solve the problem of ineffective cell temperature acquisition caused by multiple assembly interfaces and air gaps between the temperature acquisition element and the cell top cover.

[0006] In a first aspect, this application provides an integrated busbar, comprising: The isolation plate has through holes; The circuit board and the battery cell are both disposed on the side of the isolation plate away from the battery cell. The circuit board has an extension located inside the through hole. A signal acquisition element is disposed on the extension portion, the extension portion is electrically connected to the circuit board, and the extension portion passes through the through hole and covers the battery cell; A fixing component is connected to the plate, and the extension is fixed in the through hole by the fixing component.

[0007] Beneficial effects: The fixing component provides a secure structure for the extension with signal acquisition elements, allowing the extension to stably pass through the through-hole and maintain contact with the battery cell surface. This reduces thermal resistance and contact uncertainty in the heat transfer path, ensuring accurate temperature acquisition and fast response. By connecting the fixing component to the battery plate, the fixing point of the extension is transferred from the isolation plate to the structurally stable battery plate, effectively avoiding poor contact between the signal acquisition elements and the battery cell caused by vibration or deformation of the isolation plate.

[0008] In one alternative implementation, the fixing component includes: A bracket is disposed within the through hole. The bracket includes a connecting part and a fixing part, which are distributed sequentially along a first direction. The fixing part and the connecting part are connected. The fixing part is provided with a mounting hole, and the extension part is disposed within the mounting hole. The connecting part is connected to the plate. A cover plate, corresponding to the position of the mounting hole, is placed on the extension. The cover plate is connected to the fixing part. The cover plate is provided with a clearance hole, and the signal acquisition element is located in the clearance hole.

[0009] Beneficial effects: The connecting part of the bracket achieves a stable connection with the battery chip, the mounting holes of the fixing part provide precise positioning and circumferential limitation for the extension, and the cover plate presses the extension onto the battery cell to encapsulate it, preventing it from loosening in a vibrating environment. The split structure of the bracket and cover plate not only simplifies assembly but also creates multi-directional constraints, improving the positional stability and operational reliability of the signal acquisition element under complex operating conditions.

[0010] In one optional embodiment, the mounting hole is provided with a boss structure on each of the two opposite sidewalls along the second direction. The boss structure is provided with a connected hook body and a snap-fit ​​protrusion in sequence along the direction away from the battery cell. The snap-fit ​​protrusions on the two boss structures are arranged opposite to each other, and the cover plate is located between the snap-fit ​​protrusion and the extension.

[0011] Beneficial effects: The boss structure and its hook body, along with the engaging protrusions, constitute a snap-fit ​​structure that can securely engage and limit the cover plate. This snap-fit ​​structure ensures the cover plate is firmly engaged with the fixed part, guaranteeing the pressure of the cover plate on the extension. The relative arrangement of the engaging protrusions ensures a balanced locking force, effectively preventing the cover plate from tilting or loosening on one side, further enhancing the reliability of the fixing effect.

[0012] In one optional embodiment, the fixing part includes a first surface and a second surface facing each other, the fixing part is located between the circuit board and the battery cell, the first surface of the fixing part abuts against the circuit board, and the second surface of the fixing part abuts against the battery cell; A notch is provided on the first surface of the fixing part away from the edge of the connecting part along the first direction. The notch is located between the two boss structures along the second direction and communicates with the mounting hole. The extension part passes through the notch.

[0013] Beneficial effects: The notch provides a channel for lateral mounting and avoidance of the extension, allowing the extension with signal acquisition components to enter the mounting hole from the side, reducing the bending degree of the extension, avoiding damage to the circuit board by the cover plate, and enabling the cover plate to press the top of the extension.

[0014] In one optional embodiment, the connecting part is a spring sheet structure, the spring sheet structure has a tendency to move away from the battery cell, the side of the spring sheet structure away from the battery cell is the upper surface, the side of the bar sheet facing the battery cell is the lower surface, the upper surface abuts against the lower surface, and the upper surface is higher than the lower surface along the direction from the battery cell to the bar sheet; The upper surface is provided with a connector, and the bar sheet is provided with a connection hole. The connector is inserted into the connection hole and connected to the bar sheet.

[0015] Beneficial effects: By setting the connecting part as a spring-loaded structure with pre-compression force and having its upper surface abut against the lower surface of the battery in an inclined manner, the elastic deformation of the spring-loaded structure automatically compensates for the assembly tolerance between the battery and the bracket, achieving a tight contact between the connecting part and the battery without gaps. At the same time, it can also be adapted to battery cells with different pole heights.

[0016] In one optional embodiment, the connection interface between the fixing part and the connecting part on the side away from the battery cell is provided with a protruding structure. The side of the protruding structure facing the connecting part along the first direction is a first limiting surface, and the side of the pad facing the protruding structure along the first direction is a second limiting surface. The first limiting surface and the second limiting surface abut against each other.

[0017] Beneficial effects: The protruding structure and the cooperation between its first limiting surface and the second limiting surface of the pad can provide a limiting effect in the first direction, preventing the bracket from moving relative to the pad when subjected to external force, enhancing the structural rigidity and stability of the entire fixing component in multiple dimensions, and ensuring the reliability of long-term use.

[0018] In one alternative embodiment, the support includes: The abutting part is provided in pairs, and the pair of abutting parts are respectively provided on both sides of the connecting part along the second direction. The abutting part is connected to the fixing part. The abutting part is located between the bar and the battery cell. The side of the abutting part facing the battery cell abuts against the battery cell. The upper surface along the direction from the battery cell to the bar is higher than the side of the abutting part away from the battery cell.

[0019] Beneficial effects: The addition of a pair of abutment parts increases the contact area between the bracket and the battery cell, improves the support stability of the bracket on the battery cell, and helps to share the load, thereby enhancing the overall structural strength.

[0020] In one alternative implementation, it further includes: A thermally conductive layer is disposed between the extension and the battery cell, and is connected to both the battery cell and the extension.

[0021] Beneficial effects: The addition of a thermally conductive layer between the extension and the cell surface effectively eliminates the thermal resistance caused by air gaps, improving heat transfer efficiency. This ensures that the heat generated by the cell can be quickly transferred to the signal acquisition element, improving the real-time performance and accuracy of temperature measurement.

[0022] In one alternative embodiment, the connecting portion, the fixing portion, and the abutting portion are constructed as an integral structure.

[0023] Beneficial effects: By constructing the connecting part, fixing part and abutment part into an integrated structure, the problems of gaps, loosening or assembly errors caused by the connection and fit between various parts are reduced, the overall strength is enhanced and the structural stability is improved.

[0024] Secondly, this application also provides a battery pack including an integrated busbar.

[0025] Since the battery pack includes an integrated busbar, which has the same effect as an integrated busbar, it will not be elaborated 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 an integrated busbar structure according to an embodiment of this application; Figure 2 This is an exploded view of the integrated busbar structure in an embodiment of this application; Figure 3 for Figure 1 A magnified view of part A in the diagram; Figure 4 This is a cross-sectional view of the integrated busbar along the first direction in an embodiment of this application; Figure 5 This is a cross-sectional view of the fixing part along the second direction in an embodiment of this application; Figure 6 This is a cross-sectional view of the connecting portion along the second direction in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the bracket in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of the plasmid in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Isolation plate; 101. Through hole; 2. Circuit board; 201. Extension; 3. Bar plate; 301. Lower surface; 302. Connecting hole; 303. Second limiting surface; 4. Signal acquisition element; 5. Bracket; 501. Connecting part; 5011. Upper surface; 5012. Connector; 502. Fixing part; 5021. Mounting hole; 5022. Boss structure; 5023. Hook body; 5024. Snap-fit ​​protrusion; 5025. First surface; 5026. Second surface; 5027. Notch; 5028. Protrusion structure; 5029. First limiting surface; 503. Abutment part; 6. Cover plate; 601. Clearance hole; 7. Heat-conducting layer; 8. Battery cell; X, First direction; Y, Second direction. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. 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.

[0030] The following is combined Figures 1 to 8 This describes an embodiment of the present application.

[0031] According to an embodiment of this application, an integrated busbar is provided, including an isolation plate 1, a signal acquisition element 4, a fixing assembly, a circuit board 2, and a switch plate 3. The isolation plate 1 has a through hole 101. The circuit board 2 and the switch plate 3 are both disposed on the side of the isolation plate 1 away from the battery cell 8. The circuit board has an extension 201 located within the through hole 101. The signal acquisition element 4 is disposed on the extension 201 and electrically connected to the extension 201. The extension 201 passes through the through hole 101 and covers the battery cell 8. The fixing assembly is connected to the switch plate 3, and the signal acquisition element 4 is fixed within the through hole 101 by the fixing assembly.

[0032] It should be noted that the signal acquisition element 4 is set as an NTC (Negative Temperature Coefficient) chip, the circuit board 2 is set as an FPC (Flexible Printed Circuit), and the bar plate 3 is connected to the circuit board 2 through a nickel strip.

[0033] The circuit board 2 has a signal acquisition module and an area (i.e., extension 201) for mounting the NTC chip. The NTC chip forms a tight thermal contact with the surface of the cell 8 through the through hole 101, senses the temperature change and changes its own resistance value. The resistance value is used as temperature information and is transmitted to the signal acquisition module through the lines on the FPC, and finally transmitted to the BMS (Battery Management System).

[0034] Understandably, both the circuit board 2 and the electrode 3 are located on the side of the isolation plate 1 away from the battery cell 8, that is, on the outer surface of the isolation plate 1. The isolation plate 1 not only has a through hole 101 for the extension 201 with the signal acquisition element 4 to pass through, but also has a cutout area for the electrode 3 to connect with the terminal of the battery cell 8. In order to realize the connection between the fixing component and the electrode 3, the through hole 101 and the cutout area are in a connected state. The cutout area closest to the through hole 101 is connected to the through hole 101, so that the fixing component is located in both the cutout area and the through hole 101 at the same time, thereby realizing the connection and fixing with the electrode 3 and the signal acquisition element 4.

[0035] In this embodiment, the fixing component provides a fixing structure for the signal acquisition element 4, allowing the extension 201 carrying the signal acquisition element 4 to stably pass through the through hole 101 and maintain contact with the surface of the battery cell 8. This reduces the thermal resistance and contact uncertainty of the heat transfer path, ensuring the accuracy and response speed of temperature acquisition. By setting a structure connecting the fixing component to the plate 3, the fixing base point of the signal acquisition element 4 is transferred from the isolation plate 1 to the structurally stable plate 3, effectively avoiding the problem of poor contact between the signal acquisition element 4 and the battery cell 8 caused by vibration or deformation of the isolation plate 1.

[0036] In one embodiment, the fixing assembly includes a bracket 5 and a cover plate 6. The bracket 5 is disposed within the through hole 101 and includes a connecting portion 501 and a fixing portion 502. The connecting portion 501 and the fixing portion 502 are sequentially distributed along a first direction X, and the fixing portion 502 is connected to the connecting portion 501. The fixing portion 502 is provided with a mounting hole 5021, and an extension portion 201 is disposed within the mounting hole 5021. The connecting portion 501 is connected to the bar plate 3. The cover plate 6 corresponds to the mounting hole 5021 and is disposed on the extension portion 201. The cover plate 6 is connected to the fixing portion 502 and is provided with a clearance hole 601, within which the signal acquisition element 4 is located.

[0037] It should be noted that, as Figure 3 As shown, the bracket 5 is placed inside the through hole 101, and the mounting hole 5021 on the fixing part 502 corresponds to and is connected to the through hole 101, so that the signal acquisition element 4 can pass through the mounting hole 5021 and contact the battery cell 8.

[0038] It is understood that the components extending into the mounting hole 5021 include a signal acquisition element 4 and an extension 201. The signal acquisition element 4 is disposed on the area of ​​the circuit board 2 extending from the side (i.e., the extension 201). Therefore, the cover plate 6 abuts against the relatively protruding area of ​​the circuit board 2, thereby fixing the signal acquisition element 4.

[0039] Optionally, a clearance hole 601 may be provided on the cover plate 6 to allow clearance for the signal acquisition element 4 mounted on the extension 201.

[0040] In this embodiment, the connecting part 501 of the bracket 5 achieves a stable connection with the pad 3, the mounting hole 5021 of the fixing part 502 precisely positions and circumferentially limits the extension 201, and the cover plate 6 presses the extension 201 onto the cell 8 to encapsulate the extension 201 and prevent it from loosening in a vibration environment. The split structure of the bracket 5 and the cover plate 6 not only makes assembly simple, but also forms multi-directional constraints, improving the positional stability and operational reliability of the signal acquisition element 4 under complex working conditions.

[0041] In one embodiment, the mounting hole 5021 is provided with two opposite sidewalls along the second direction Y, and the boss structure 5022 is provided with a connected hook body 5023 and a snap-fit ​​protrusion 5024 in sequence along the direction away from the battery cell 8. The snap-fit ​​protrusions 5024 on the two boss structures 5022 are arranged opposite to each other, and the cover plate 6 is located between the snap-fit ​​protrusion 5024 and the extension 201.

[0042] It should be noted that, as Figure 5As shown, the first direction X and the second direction Y are perpendicular to each other, and the plane formed by them is a horizontal plane. A snap-fit ​​structure consisting of a hook body 5023 and a snap-fit ​​protrusion 5024 is located on two boss structures 5022 with the snap-fit ​​protrusion 5024 facing each other.

[0043] Optionally, multiple snap-fit ​​structures can be provided on each boss structure 5022, and the snap-fit ​​structures located on the same boss structure 5022 are spaced apart along the first direction X.

[0044] Optionally, multiple snap-fit ​​structures located on the two boss structures 5022 are symmetrically arranged one by one.

[0045] In this embodiment, the boss structure 5022 and its hook body 5023 and engaging protrusion 5024 constitute a snap-fit ​​structure that can engage and limit the cover plate 6. The snap-fit ​​structure allows the cover plate 6 to be firmly engaged with the fixing part 502, ensuring the pressing force of the cover plate 6 on the extension part 201. The relative arrangement of the engaging protrusions 5024 ensures the balance of the locking force, effectively preventing the cover plate 6 from tilting or loosening on one side, and further enhancing the reliability of the fixing effect.

[0046] In one embodiment, the fixing part 502 includes a first surface 5025 and a second surface 5026 facing each other. The fixing part 502 is located between the circuit board 2 and the battery cell 8. The first surface 5025 of the fixing part 502 abuts against the circuit board 2, and the second surface 5026 of the fixing part 502 abuts against the battery cell 8. A notch 5027 is provided on the edge of the first surface 5025 of the fixing part 502 away from the connecting part 501 along the first direction X. The notch 5027 is located between two boss structures 5022 along the second direction Y, and the notch 5027 communicates with the mounting hole 5021. The extension 201 passes through the notch 5027.

[0047] It should be noted that, as Figure 5 As shown, the first surface 5025 of the fixing part 502 forms an annular structure due to the mounting hole 5021. The first surface 5025 of the fixing part 502 abuts against the side of the circuit board 2 facing the battery cell 8. The second surface 5026 of the fixing part 502 also forms an annular structure due to the mounting hole 5021. The second surface 5026 of the fixing part 502 abuts against the surface of the battery cell 8. Together with the connection relationship between the connecting part 501 and the plate 3, they work together to further enhance the structural stability.

[0048] It is understandable that the extension 201 with signal acquisition element 4 passes through the notch 5027 and is located in the mounting hole 5021, so that the extension 201 can be placed in the mounting hole 5021 and pressed by the cover plate 6 to achieve positioning.

[0049] Optionally, the mounting hole 5021 can be configured as a rectangular hole.

[0050] In this embodiment, the notch 5027 provides a channel for the lateral installation and avoidance of the extension 201, allowing the extension 201 and the portion connected to the circuit board 2 to enter the mounting hole 5021 from the side, reducing the degree of bending of the circuit board 2, preventing the cover plate 6 from damaging the circuit board 2, and enabling the cover plate 6 to press the top of the extension 201.

[0051] In one embodiment, the connecting part 501 is a spring-loaded structure with a tendency to move away from the battery cell 8. The side of the spring-loaded structure away from the battery cell 8 is the upper surface 5011, and the side of the bar plate 3 facing the battery cell 8 is the lower surface 301. The upper surface 5011 abuts against the lower surface 301, and the upper surface 5011 is higher than the lower surface 301 along the direction from the battery cell 8 to the bar plate 3. A connector 5012 is provided on the upper surface 5011, and a connecting hole 302 is provided on the bar plate 3. The connector 5012 is inserted into the connecting hole 302 and connected to the bar plate 3.

[0052] It should be noted that, as Figure 4 and Figure 7 As shown, the spring contact structure includes a first plate segment and a second plate segment, which are connected along a first direction X. The first plate segment is connected to the fixing part 502. The first plate segment is inclined relative to the horizontal plane, and the end of the first plate segment connected to the fixing part 502 is lower than the end connected to the second plate segment, thereby making the second plate segment higher than the first plate segment. Combined with the elasticity of the spring contact structure, it can be adapted to battery cells 8 with different pole heights.

[0053] Optionally, connector 5012 may be configured as a hot-melt column.

[0054] In this embodiment, the connecting part 501 is configured as a spring sheet structure with pre-compression force, and its upper surface 5011 abuts against the lower surface 301 of the plate 3 in an inclined manner. The elastic deformation of the spring sheet structure automatically compensates for the assembly tolerance between the plate 3 and the bracket 5, realizing a tight contact between the connecting part 501 and the plate 3 without gaps. At the same time, it can also be adapted to battery cells 8 with different pole heights.

[0055] In one embodiment, a protruding structure 5028 is provided at the connection interface between the fixing part 502 and the connecting part 501 on the side away from the battery cell 8. The side of the protruding structure 5028 facing the connecting part 501 along the first direction X is a first limiting surface 5029, and the side of the pad 3 facing the protruding structure 5028 along the first direction X is a second limiting surface 303. The first limiting surface 5029 and the second limiting surface 303 abut against each other.

[0056] It should be noted that, as Figure 4As shown, the first limiting surface 5029 extends along the second direction Y, and the second limiting surface 303 extends along the second direction Y, thereby increasing the contact area of ​​the first limiting surface 5029 and the second limiting surface 303, and further improving the contact stability between the protruding structure 5028 and the plate 3.

[0057] Understandably, the side of the protruding structure 5028 away from the connecting part 501 along the first direction X can abut against the cover plate 6, thereby cooperating with the snap-fit ​​structure to further limit the cover plate 6.

[0058] In this embodiment, the cooperation between the protruding structure 5028 and its first limiting surface 5029 and the second limiting surface 303 of the pad 3 can provide a limiting effect in the first direction X, preventing the bracket 5 from moving relative to the pad 3 when subjected to external force, thereby enhancing the structural rigidity and stability of the entire fixing assembly in multiple directions and ensuring the reliability of long-term use.

[0059] In one embodiment, the bracket 5 includes an abutment portion 503. A pair of abutment portions 503 are provided. The pair of abutment portions 503 are respectively provided on both sides of the connecting portion 501 along the second direction Y. The abutment portion 503 is connected to the fixing portion 502. The abutment portion 503 is located between the bar sheet 3 and the battery cell 8. The side of the abutment portion 503 facing the battery cell 8 abuts against the battery cell 8. The upper surface 5011 along the direction from the battery cell 8 to the bar sheet 3 is higher than the side of the abutment portion 503 away from the battery cell 8.

[0060] Optionally, a gap may be left between the abutment portion 503 and the plate 3.

[0061] In this embodiment, the provision of a pair of abutment portions 503 increases the contact area between the bracket 5 and the battery cell 8, improves the support stability of the bracket 5 on the battery cell 8, and plays the role of sharing the load it bears, thereby improving the overall structural strength.

[0062] In one embodiment, a thermally conductive layer 7 is further included, which is disposed between the extension 201 and the battery cell 8 and is connected to the battery cell 8 and the extension 201 respectively.

[0063] Optionally, the thermal conductive layer 7 can be configured as a thermal conductive pad, which can be placed between the extension 201 and the battery cell 8 during installation.

[0064] Optionally, the thermally conductive layer 7 can be made of thermally conductive adhesive, which is injected into the mounting hole 5021 during installation. Then, the extension 201 is snapped into the snap-fit ​​structure and the cover plate 6 is placed. The thermally conductive adhesive can evenly cover the bottom of the extension 201.

[0065] In this embodiment, a thermally conductive layer 7 is added between the extension 201 and the surface of the battery cell 8, which can effectively eliminate the thermal resistance caused by the air gap and improve the heat transfer efficiency. This ensures that the heat generated by the battery cell 8 can be quickly transferred to the extension 201, improving the real-time performance and accuracy of temperature measurement.

[0066] In one embodiment, the connecting part 501, the fixing part 502, and the abutting part 503 are constructed as an integral structure.

[0067] In this embodiment, the connecting part 501, the fixing part 502 and the abutting part 503 are constructed as an integral structure, which reduces the problems of gaps, loosening or assembly errors caused by the connection and fit between various components, enhances the overall strength and improves the structural stability.

[0068] According to an embodiment of this application, another aspect provides a battery pack including an integrated busbar.

[0069] Since the battery pack includes an integrated busbar, which has the same effect as an integrated busbar, it will not be elaborated further here.

[0070] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An integrated busbar, characterized in that, include: The isolation plate (1) is provided with a through hole (101); The circuit board (2) and the battery plate (3) are both disposed on the side of the isolation plate (1) away from the battery cell (8). The circuit board has an extension (201) located inside the through hole (101). A signal acquisition element (4) is disposed on the extension (201). The signal acquisition element (4) is electrically connected to the extension (201). The extension (201) passes through the through hole (101) and covers the battery cell (8). A fixing component is connected to the plate (3), and the extension (201) is fixed in the through hole (101) by the fixing component.

2. The integrated busbar according to claim 1, characterized in that, The fixing component includes: A bracket (5) is disposed in the through hole (101). The bracket (5) includes a connecting part (501) and a fixing part (502). The connecting part (501) and the fixing part (502) are distributed sequentially along the first direction (X). The fixing part (502) is connected to the connecting part (501). The fixing part (502) is provided with a mounting hole (5021). The extension part (201) is disposed in the mounting hole (5021). The connecting part (501) is connected to the bar plate (3). The cover plate (6) corresponds to the position of the mounting hole (5021) and is placed on the extension (201). The cover plate (6) is connected to the fixing part (502). The cover plate (6) is provided with a clearance hole (601). The signal acquisition element (4) is located in the clearance hole (601).

3. The integrated busbar according to claim 2, characterized in that, The mounting hole (5021) is provided with a boss structure (5022) on two opposite sidewalls along the second direction (Y). The boss structure (5022) is provided with a connected hook body (5023) and a snap-fit ​​protrusion (5024) in sequence along the direction away from the battery cell (8). The snap-fit ​​protrusions (5024) on the two boss structures (5022) are arranged opposite to each other. The cover plate (6) is located between the snap-fit ​​protrusion (5024) and the extension (201).

4. The integrated busbar according to claim 3, characterized in that, The fixing part (502) includes a first surface (5025) and a second surface (5026) facing each other. The fixing part (502) is located between the circuit board (2) and the battery cell (8). The first surface (5025) of the fixing part (502) abuts against the circuit board (2), and the second surface (5026) of the fixing part (502) abuts against the battery cell (8). The first surface (5025) of the fixing part (502) is provided with a notch (5027) on the edge away from the connecting part (501) along the first direction (X). The notch (5027) is located between the two boss structures (5022) along the second direction (Y), and the notch (5027) communicates with the mounting hole (5021). The extension (201) passes through the notch (5027).

5. The integrated busbar according to claim 3, characterized in that, The connecting part (501) is a spring sheet structure. The spring sheet structure has a tendency to move away from the battery cell (8). The side of the spring sheet structure away from the battery cell (8) is the upper surface (5011). The side of the bar sheet (3) facing the battery cell (8) is the lower surface (301). The upper surface (5011) abuts against the lower surface (301). The upper surface (5011) is higher than the lower surface (301) along the direction from the battery cell (8) to the bar sheet (3). The upper surface (5011) is provided with a connector (5012), and the bar piece (3) is provided with a connection hole (302). The connector (5012) is inserted into the connection hole (302) and connected to the bar piece (3).

6. The integrated busbar according to claim 5, characterized in that, The connection interface between the fixing part (502) and the connecting part (501) on the side away from the battery cell (8) is provided with a protruding structure (5028). The side of the protruding structure (5028) facing the connecting part (501) along the first direction (X) is a first limiting surface (5029), and the side of the pad (3) facing the protruding structure (5028) along the first direction (X) is a second limiting surface (303). The first limiting surface (5029) and the second limiting surface (303) abut against each other.

7. The integrated busbar according to claim 5, characterized in that, The support (5) includes: A pair of abutting portions (503) are provided. The pair of abutting portions (503) are respectively provided on both sides of the connecting portion (501) along the second direction (Y), and the abutting portions (503) are connected to the fixing portion (502). The abutting portions (503) are located between the bar sheet (3) and the battery cell (8). The side of the abutting portion (503) facing the battery cell (8) abuts against the battery cell (8). The upper surface (5011) along the direction from the battery cell (8) to the bar sheet (3) is higher than the side of the abutting portion (503) away from the battery cell (8).

8. The integrated busbar according to claim 1, characterized in that, Also includes: A heat-conducting layer (7) is disposed between the extension (201) and the battery cell (8), and is connected to the battery cell (8) and the extension (201) respectively.

9. The integrated busbar according to claim 7, characterized in that, The connecting part (501), the fixing part (502) and the abutting part (503) are constructed as an integral structure.

10. A battery pack, characterized in that, include: The integrated busbar according to any one of claims 1 to 9.

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