Conducting strip, battery pack, test equipment and electric equipment

Abstract

The utility model discloses a conducting strip, a battery pack, test equipment and electric equipment, and belongs to the technical field of batteries. The conducting strip comprises a first surface and a second surface which are oppositely arranged; the first surface is provided with a welding area, the edge of the welding area is provided with an annular welding mark, and the second surface of the conducting strip is connected with the electrode terminal of the battery monomer through the welding mark. The conducting strip and the pole are electrically connected through the annular welding mark, and the annular welding mark increases the contact area of the conducting strip and the pole and widens the conduction channel of current, so that the heat generated by the conducting strip during overcurrent is reduced, the influence on the sealing of the pole is avoided, and the use or test safety of the single battery is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a conductive sheet, battery pack, testing equipment, and electrical equipment. Background Technology

[0002] Conductive plates need to be welded onto individual battery cells for electrical connection.

[0003] However, current conductive sheets generate a lot of heat when current passes through them, causing the plastic on the battery cell's terminals to melt, resulting in terminal seal failure and affecting the safety of the battery cell. Utility Model Content

[0004] Purpose of this application: This application provides a single battery cell for reducing the heat generation of the conductive sheet and improving the safety performance of the single battery cell; this application also provides a battery pack, testing equipment, and electrical equipment.

[0005] Technical solution: This application provides a conductive sheet, comprising:

[0006] The first and second sides are set relative to each other;

[0007] The first surface is provided with a welding area, the edge of which has an annular solder mark, and the second surface of the conductive sheet is connected to the electrode terminal of the battery cell through the solder mark.

[0008] In some embodiments, the welding area is elliptical or circular.

[0009] In some embodiments, the welding area has a minimum size D1, 10mm≤D1≤D2, where D2 is the minimum size of the electrode terminal.

[0010] In some embodiments, the thickness of the welding area is less than the thickness of other areas in the conductive sheet.

[0011] In some embodiments, the middle portion of the conductive sheet protrudes relative to the two sides to form a protrusion on the first surface and a recess on the second surface, wherein the electrode terminal is embedded in the recess.

[0012] In some embodiments, a first positioning groove is formed on the second surface, and the surface of the first positioning groove is in contact with the surface of the electrode terminal.

[0013] In some embodiments, the shape of the solder mark is the same as the shape of the edge of the welding area.

[0014] In some embodiments, the solder mark covers the edge of the welding area.

[0015] In some embodiments, positioning holes are provided in the welding area.

[0016] In some embodiments, the conductive sheet further includes:

[0017] A first body and a second body, wherein the welding area is disposed on the first body, and the second body is connected to the first body and the testing device.

[0018] In some embodiments, there is an included angle between the first body and the second body.

[0019] In some embodiments, the second body has a wiring hole, and the second body is connected to the test device through the wiring hole.

[0020] Accordingly, this application also provides a battery pack, including:

[0021] The conductive sheet as described in any of the above embodiments;

[0022] Multiple battery cells are connected to each other via the conductive sheet.

[0023] Accordingly, this application also provides a testing device, including:

[0024] The conductive sheet as described in any of the above embodiments;

[0025] A testing device, wherein the testing device is connected to the battery cell via the conductive sheet.

[0026] Accordingly, this application also provides an electrical appliance, including:

[0027] The conductive sheet as described in any of the above embodiments;

[0028] Multiple battery cells are connected to each other via the conductive sheet.

[0029] Beneficial Effects: Compared with the prior art, the conductive sheet provided in this application includes: a first surface and a second surface disposed opposite to each other; the first surface has a welding area, the edge of which has an annular solder mark, and the conductive sheet is connected to the electrode terminals of a battery cell through the solder mark. In use, the conductive sheet connects battery cells to each other, or connects a battery cell to an electrical device, or connects a battery cell to a testing device. The current in the battery cell flows along the electrode terminals to the solder mark, and then flows out along the annular solder mark to other battery cells, electrical devices, or testing devices. In this way, the conductive sheet and the terminal are electrically connected through the annular solder mark, and the annular solder mark increases the contact area between the conductive sheet and the electrode terminals, widens the current conduction channel, thereby reducing the heat generated by the conductive sheet when current passes through, avoiding affecting the sealing effect of the electrode terminals, and improving the safety of battery cell use or testing.

[0030] It is understood that, compared with the prior art, the battery pack provided in this application embodiment includes all the technical features and technical effects of the above-mentioned conductive sheet, and will not be repeated here.

[0031] It is understood that, compared with the prior art, the testing device provided in this application embodiment includes all the technical features and technical effects of the above-mentioned conductive sheet, and will not be repeated here.

[0032] It is understood that, compared with the prior art, the electrical equipment provided in this application embodiment includes all the technical features and technical effects of the above-mentioned conductive sheet, and will not be repeated here. Attached Figure Description

[0033] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0034] Figure 1 A schematic diagram of the first structure of the conductive sheet provided in an embodiment of this application from one angle;

[0035] Figure 2 This is a schematic diagram of the first structure of the conductive sheet provided in an embodiment of this application from another angle;

[0036] Figure 3 This is a schematic diagram of the second structure of the conductive sheet provided in the embodiments of this application;

[0037] Figure 4 A schematic diagram of the second structure of the conductive sheet provided in the embodiments of this application from one angle;

[0038] Figure 5 This is a schematic diagram from another angle of the second structure of the conductive sheet provided in the embodiments of this application;

[0039] Figure 6 This is a schematic diagram of the structure of a battery cell connected by a conductive sheet according to an embodiment of this application;

[0040] Figure 7 This is a schematic diagram showing the connection between the conductive sheet and the battery cell provided in the embodiments of this application;

[0041] Figure 8 for Figure 7 Schematic diagram of the cross section of AA;

[0042] Figure 9 for Figure 8 Enlarged view of region B in the middle;

[0043] Figure 10 This is a schematic diagram of the connection between individual cells in a battery pack provided in an embodiment of this application.

[0044] Figure 11 This is a first connection diagram of the conductive sheet connection test device and the battery cell provided in an embodiment of this application.

[0045] Figure 12 This is a second connection diagram of the conductive sheet connection test device and the battery cell provided in an embodiment of this application.

[0046] Reference numerals: 10-First surface; 11-Welding area; 12-Protrusion; 13-Positioning hole; 20-Second surface; 21-Recess; 22-First positioning groove; 23-Second positioning groove; 30-Solder mark; 40-Battery cell; 41-Electrode terminal; 50-First body; 60-Second body; 61-Wiring hole; 70-Testing device. Detailed Implementation

[0047] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" 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, a link, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0049] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0050] Please refer to the following: Figures 1 to 6 , Figure 1 This is a schematic diagram illustrating an angle of the first structure of the conductive sheet provided in an embodiment of this application; Figure 2This is a schematic diagram illustrating another angle of the first structure of the conductive sheet provided in an embodiment of this application; Figure 3 This illustration shows a schematic diagram of the second structure of the conductive sheet provided in an embodiment of this application; Figure 4 This is a schematic diagram illustrating an angle of the second structure of the conductive sheet provided in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram illustrating another angle of the second structure of the conductive sheet provided in an embodiment of this application; Figure 6 This application provides a schematic diagram illustrating the structure of a battery cell connected by a conductive sheet according to an embodiment of the present application. The conductive sheet includes a first surface 10 and a second surface 20 disposed opposite to each other. The first surface 10 has a welding area 11, the edge of which has an annular solder mark 30. The second surface 20 of the conductive sheet is connected to the electrode terminal 41 of the battery cell 40 via the solder mark 30. It should be noted that the annular shape in this application refers to a closed shape, which can be a closed regular ring or a closed irregular ring, as long as the solder mark 30 exists in a closed ring shape. The electrode terminal 41 in this application includes a terminal post, plastic, and an aluminum block. The terminal post is connected to the inner core of the battery cell 40. The plastic has a first through hole, the terminal post passes through the first through hole, and the aluminum block is disposed on the side of the plastic facing away from the inner core. The aluminum block has a second through hole corresponding to the first through hole. The terminal post passes through the first through hole and the second through hole in sequence and is then connected to the aluminum block. The surface of the aluminum block facing away from the plastic is higher than the top surface of the terminal post. When the conductive sheet needs to be welded to the electrode terminal 41, the second side 20 of the conductive sheet should first be placed facing the aluminum block away from the plastic surface, and the welding area 11 should be aligned with the aluminum block. Then, welding is performed along the preset trajectory. The welding laser or ultrasonic wave penetrates the first side 10 and the second side 20, and forms a ring-shaped and closed solder mark 30 on the surfaces of both the first side 10 and the second side 20, so that the conductive sheet and the aluminum block are connected by the solder mark 30.

[0052] It is understood that in this embodiment, the connection of the conductive sheet simultaneously achieves both physical and electrical connection. Therefore, in use, the conductive sheet connects the battery cell 40 to other battery cells 40, or connects the battery cell 40 to an electrical device, or connects the battery cell 40 to the testing device 70. All of these connections simultaneously achieve both physical and electrical connection. Furthermore, since the aluminum block is higher than the top surface of the electrode post on the surface away from the plastic, the conductive sheet does not actually contact the electrode post. The current in the battery cell 40 flows from the electrode post to the aluminum block, then from the aluminum block through the solder mark 30 to the conductive sheet, and finally from the conductive sheet to other battery cells 40, electrical devices, or the testing device 70. No current flows through the portion of the welding area 11 surrounded by the solder mark 30. Thus, the conductive sheet and the aluminum block of the electrode terminal 41 are electrically connected by an annular solder mark 30. The annular solder mark 30, due to its longer circumference, increases the contact length between the conductive sheet and the electrode terminal 41, and the conductive sheet further widens the current conduction path, thereby reducing the heat generated by the conductive sheet when current flows or even overcurrent occurs. This prevents the plastic from melting due to heat, affecting the seal of the electrode terminal 41, and improving the safety of the battery cell 40 during use or testing. Furthermore, the solder does not need to be supplied separately; the conductive sheet inside the welding area 11 can be used directly as the solder, saving materials and costs.

[0053] In some embodiments, the welding area 11 is elliptical or circular. Correspondingly, the annular weld mark 30 is also elliptical or circular. Thus, when the conductive sheet is welded to the battery cell 40, the elliptical or circular welding area 11 can achieve a uniform distribution of welding stress, reduce the risk of welding stress concentration, reduce welding defects, increase the welding contact area, thereby increasing welding strength and reliability, and reducing the probability of failure in the connection between the conductive sheet and the battery cell 40. The formed weld mark 30 can also make the current transmission more stable.

[0054] Please refer to the following: Figure 7 , Figure 8 and Figure 9 , Figure 7 This illustration shows the connection diagram between the conductive sheet and the battery cell provided in the embodiments of this application; Figure 8 It indicated Figure 7 Schematic diagram of the cross section of AA; Figure 9 It indicated Figure 8An enlarged schematic diagram of region B is shown. In some embodiments, the welding region 11 has a minimum size D1, satisfying: 10mm ≤ D1 ≤ D2, where D2 is the minimum size of the electrode terminal 41. It is understood that the inner diameter of the welding region 11 cannot be infinitely large; it is also necessary to ensure that the conductive sheet and the battery cell 40 are connected via solder joints 30. Since the connection between the conductive sheet and the electrode terminal 41 is actually the connection between the conductive sheet and the aluminum block, the maximum value of the minimum size D1 of the welding region 11 should be less than the minimum size of the electrode terminal 41, i.e., the minimum size of the aluminum block, so that the solder joints 30 formed along the edge of the welding region 11 can always connect with the aluminum block. Specifically, this application sets a minimum size for the welding region 11 to ensure that the welding region 11 has sufficient welding contact area, increasing the strength and stability of the weld. Secondly, during the welding process, a larger inner diameter can improve the feasibility of the welding process, accommodating more welding material, making the welding operation easier and more stable, and reducing welding defects. In addition, the weld mark 30 formed along the edge of the welding area 11 also has a large size, thereby increasing the current conduction area between the conductive sheet and the battery cell 40, widening the current conduction channel, thereby reducing the heat generated by the conductive sheet during overcurrent, avoiding affecting the sealing of the electrode terminal 41, and improving the safety of the battery cell 40 in use or testing.

[0055] Please refer to it again. Figure 9 In some embodiments, the thickness of the welding region 11 is less than the thickness of other regions in the conductive sheet. Specifically, the smaller thickness of the welding region 11 means that heat conduction in the welding region is faster, thereby dissipating heat more effectively from the overcurrent conductive sheet and reducing the impact of temperature rise on the conductive sheet. Furthermore, by reducing the thickness of the welding region 11, the overall weight of the conductive sheet can be reduced. The thickness of the welding region 11 is sufficient for the solder mark 30 to be formed.

[0056] Please refer to it again. Figure 1 and Figure 2In some embodiments, the middle portion of the conductive sheet protrudes relative to its two sides, forming a protrusion 12 on the first surface 10 and a recess 21 on the second surface 20, with the electrode terminal 41 embedded in the recess 21. It should be noted that the middle portion refers to the area near the centerline of the conductive sheet, including the welding area 11. The centerline is the line along the current conduction direction, which can also be described as the connecting line between the centers of the wiring hole 61 and the positioning hole 13. Furthermore, in this application, the electrode terminal 41 being embedded in the recess 21 means that all surfaces of the recess 21 are in contact with all surfaces where the electrode terminal 41 is embedded. This contact means that the two surfaces are in complete contact without gaps or openings between them. There may or may not be a pre-tightening force between the two surfaces. This application forms a protrusion 12 and a recess 21, and the surface of the recess 21 is attached to the surface of the electrode terminal 41, so that the electrode terminal 41 is accommodated in the recess 21. This achieves a locking and fixing of the electrode terminal 41 by the recess 21, ensuring a fixed contact position between the conductive sheet and the electrode terminal 41. This improves the stability and reliability of the connection between the conductive sheet and the electrode terminal 41 via the solder stamp 30, preventing loosening and poor contact between the conductive sheet and the electrode terminal 41. Simultaneously, the protrusion 12 ensures that the thickness of the conductive sheet does not change, thereby guaranteeing the structural strength of the conductive sheet and improving its durability and lifespan.

[0057] Please refer to it again. Figure 3 In some embodiments, the second surface 20 has a first positioning groove 22, the surface of which is in contact with the surface of the electrode terminal 41. In this application, "in contact" means that the two surfaces are in complete contact without any gaps or openings. There may or may not be a pre-tightening force between the two surfaces. Thus, this application can also align the electrode terminal 41 through the first positioning groove 22. By attaching the surface of the first positioning groove 22 to the surface of the electrode terminal 41, the electrode terminal 41 is accommodated in the first positioning groove 22, thereby fixing the electrode terminal 41 in place. This ensures a fixed contact position between the conductive sheet and the electrode terminal 41, positioning the conductive sheet. By placing the electrode terminal 41 in the first positioning groove 22, the position of the electrode terminal 41 is ensured to be accurate and stable, thereby ensuring correct alignment between the conductive sheet and the electrode terminal 41, improving the accuracy and reliability of the connection between the conductive sheet and the battery cell 40.

[0058] In some embodiments, the shape of the solder mark 30 is the same as the shape of the edge of the welding area 11. Specifically, the shape of the solder mark 30 in this application is the same as the shape of the edge of the welding area 11, which can improve the welding quality of the conductive sheet. The same shape can ensure that the welding area 11 has similar thermal conductivity and thermal expansion characteristics in different welding processes, thereby reducing the risk of welding deformation and stress concentration, maintaining the consistency of welding quality, enhancing the stability and reliability of the solder mark 30, reducing the contact resistance and current transmission loss of the solder mark 30, and improving the electrical connection and conductivity between the conductive sheet and the battery cell 40.

[0059] In some embodiments, the solder mark 30 covers the edge of the welding area 11. Specifically, the coverage of the solder mark 30 can increase the structural strength and stability of the welding area 11, and maximize the length of the solder mark 30, further increasing the contact length between the conductive sheet and the electrode terminal 41. The conductive sheet also widens the current conduction channel, thereby reducing the heat generated by the conductive sheet when current passes through or even when there is overcurrent, preventing the plastic from melting due to heat, affecting the sealing of the electrode terminal 41, and improving the safety of the battery cell 40 in use or testing.

[0060] Please refer to it again. Figures 1 to 5 In some embodiments, a positioning hole 13 is provided in the welding area 11. This application further matches and positions the conductive sheet and the electrode terminal 41 by using the positioning hole 13 to ensure the accurate position of the conductive sheet and improve the accuracy and reliability between the conductive sheet and the battery cell 40.

[0061] Please refer to it again. Figure 4 and Figure 5 In some embodiments, the conductive sheet further includes a first body 50 and a second body 60, with a welding area 11 disposed on the first body 50 and the second body 60 connecting the first body 50 and the testing device 70. Specifically, the first body 50 and the second body 60 can also be used to achieve connections between the conductive sheet and other battery cells 40, between the conductive sheet and electrical devices, and between the conductive sheet and the testing device 70, respectively. It is understood that due to the complexity of the structure of the testing device 70, when connecting the battery cell 40 to the testing device 70, the flat conductive sheet sometimes cannot provide a perfect connection environment. Therefore, by setting the first body 50 and the second body 60, the connection between the battery cell 40 and testing devices 70 with different structures can be adapted. For this purpose, an angle can be set between the first body 50 and the second body 60 to adapt to different usage scenarios. Similarly, when the structure of the battery cell 40 changes, or when the battery cell 40 is connected to electrical devices with different structures via a conductive sheet, the first body 50 and the second body 60 can also be used for adaptation.

[0062] Please refer to it again. Figure 5In some embodiments, there is an angle α between the first body 50 and the second body 60. The angle α can be set according to different connection scenarios to achieve adaptation to different connection scenarios.

[0063] Please refer to it again. Figure 4 and Figure 5 In some embodiments, the second body 60 has a wiring hole 61, through which the second body 60 is connected to the testing device 70. Thus, this application achieves the connection between the second body 60 of the conductive sheet and the testing device 70 through the wiring hole 61, increasing the contact stability and reliability between the second body 60 and the testing device 70, reducing contact resistance and current transmission loss, and realizing current transmission and energy exchange between the battery cell 40 and the testing device 70. Based on this, the testing device 70 measures parameters such as voltage, current, and temperature of the battery cell 40 to evaluate the performance and condition of the battery cell 40. Furthermore, the presence of the wiring hole 61 simplifies the installation and maintenance process of the conductive sheet. By connecting the second body 60 to the testing device 70, the connection steps between the testing device 70 and the battery cell 40 and the complexity of testing operations can be reduced. When it is necessary to replace or maintain the testing device 70, the operation can be conveniently performed by disassembling or connecting the wiring hole 61.

[0064] It should be noted that, in order to further increase the stability of the connection between the conductive sheet and the testing device 70 or other electrical equipment, the conductive sheet of this application is also provided with a second positioning groove 23. The second positioning groove 23 is formed on the first surface 10 and / or the second surface 20 facing the testing device 70, and the second positioning groove 23 communicates with the wiring hole 61. When the conductive sheet is provided with the first body 50 and the second body 60, the second positioning groove 23 is formed on the surface of the second body 60 facing the testing device 70, and the second positioning groove 23 communicates with the second wiring hole 61.

[0065] The conductive sheet provided in this embodiment connects battery cells 40 to other battery cells 40, or connects battery cells 40 to electrical devices, or connects battery cells 40 to testing devices 70. Current in the battery cell 40 flows along the electrode terminals 41 to the solder mark 30, and then flows out along the annular solder mark 30 to the electrical device or testing device 70. Since the aluminum block is higher than the top surface of the electrode post relative to the plastic surface, the conductive sheet does not actually contact the electrode post. Current in the battery cell 40 flows from the electrode post to the aluminum block, then from the aluminum block through the solder mark 30 to the conductive sheet, and finally from the conductive sheet to other battery cells 40, electrical devices, or testing devices 70. No current flows through the portion of the welding area 11 surrounded by the solder mark 30. Thus, the conductive sheet and the aluminum block of the electrode terminal 41 are electrically connected by annular solder marks 30. The annular solder marks 30 have a long circumference, which increases the contact length between the conductive sheet and the electrode terminal 41. The conductive sheet widens the current conduction channel, thereby reducing the heat generated by the conductive sheet when current passes through or even when there is overcurrent. This prevents the plastic from melting due to heat, which would affect the sealing of the electrode terminal 41 and improve the safety of the battery cell 40 in use or testing.

[0066] Accordingly, this application also provides a battery pack, please refer to [link / reference]. Figure 10 , Figure 10 This illustration shows a connection diagram between individual cells in a battery pack provided in an embodiment of this application. The battery pack includes: a conductive sheet as described in any of the above embodiments; and multiple battery cells 40 connected to each other via the conductive sheet. It is understood that the first surface 10 of the conductive sheet may have multiple welding areas 11, each welding area 11 having an annular solder mark 30 at its edge. The second surface 20 of the conductive sheet is connected to the electrode terminal 41 of a battery cell 40 via any one of the solder marks 30.

[0067] It is understood that, compared with the prior art, the battery pack provided in this application embodiment includes all the technical features and technical effects of the above-mentioned conductive sheet, and will not be repeated here.

[0068] Accordingly, this application also provides a testing device, which please refer to in conjunction with the application. Figure 11 and Figure 12 , Figure 11 This illustration shows a first connection diagram between the conductive sheet connection test device and the battery cell provided in an embodiment of this application;

[0069] Figure 12 This illustration shows a second connection diagram between the conductive sheet connecting the testing device and the battery cell according to an embodiment of this application. The testing device is used to test the battery cell 40 or the battery pack as described in the above embodiments. The testing device includes: a conductive sheet as described in any of the above embodiments; and a testing device 70, which is connected to the battery cell 40 via the conductive sheet.

[0070] It is understood that, compared with the prior art, the testing equipment provided in this application embodiment includes all the technical features and technical effects of the above-mentioned battery pack, and will not be repeated here.

[0071] Accordingly, this application also provides an electrical device, including a conductive sheet as described in the above embodiment and a plurality of battery cells 40, wherein the plurality of battery cells 40 are connected to each other through the conductive sheet. This electrical device can be various types of equipment such as new energy vehicles, computers, and energy storage power supply devices.

[0072] It is understood that, compared with the prior art, the electrical equipment provided in this application embodiment includes all the technical features and technical effects of the above-mentioned conductive sheet, and will not be repeated here.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The conductive sheet, battery pack, testing equipment, and electrical equipment provided in the embodiments of this application have been described in detail above. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. 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 of the technical features; 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.

Claims

1. An electrically conductive sheet, characterized in that, The conductive sheet comprises: oppositely arranged first and second surfaces (10, 20); the first surface (10) is provided with a welding area (11), an edge of the welding area (11) has a ring-shaped welding mark (30), and the second surface (20) of the conductive sheet is connected with an electrode terminal (41) of a battery monomer (40) through the welding mark (30).

2. The conductive sheet according to claim 1, wherein The welding area (11) is elliptical or circular.

3. The conductive sheet according to claim 2, wherein The welding area (11) has a minimum size D1, which satisfies 10mm≤D1≤D2, wherein D2 is the minimum size of the electrode terminal (41).

4. The conductive sheet according to claim 1, wherein The thickness of the welding area (11) is smaller than that of other areas of the conductive sheet.

5. The conductive sheet according to claim 1, wherein The middle part of the conductive sheet is raised relative to both sides to form a raised part (12) on the first surface (10) and a recessed part (21) on the second surface (20), and the electrode terminal (41) is embedded in the recessed part (21).

6. The conductive sheet according to claim 1, wherein The second surface (20) is provided with a first positioning groove (22), and the surface of the first positioning groove (22) is flush with the surface of the electrode terminal (41).

7. The conductive sheet according to claim 1, wherein The shape of the welding mark (30) is the same as that of the edge of the welding area (11).

8. The conductive sheet according to claim 1, wherein The welding mark (30) covers the edge of the welding area (11).

9. The conductive sheet according to claim 1, wherein The welding area (11) is provided with a positioning hole (13).

10. The conductive sheet according to any one of claims 1 to 9, wherein The conductive sheet further comprises: a first body (50) and a second body (60), the welding area (11) is arranged on the first body (50), and the second body (60) connects the first body (50) and a testing device (70).

11. The conductive sheet according to claim 10, wherein An included angle exists between the first body (50) and the second body (60).

12. The conductive sheet according to claim 10, wherein The second body (60) is provided with a wiring hole (61), and the second body (60) is connected with the testing device (70) through the wiring hole (61).

13. A battery pack, characterized by The conductive sheet comprises: the conductive sheet according to any one of claims 1 to 9; a plurality of battery monomers (40), and the battery monomers (40) are connected through the conductive sheet.

14. A test apparatus, characterized by The conductive sheet comprises: the conductive sheet according to any one of claims 1 to 12; a testing device (70), and the testing device (70) is connected with the battery monomer (40) through the conductive sheet.

15. An electrical device, characterized by The conductive sheet comprises: the conductive sheet according to any one of claims 1 to 9; a plurality of battery monomers (40), and the battery monomers (40) are connected through the conductive sheet.

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