Three-electrode winding assembly and three-electrode cylindrical battery device

Abstract

This invention provides a three-electrode core assembly and a three-electrode cylindrical battery device. The three-electrode core assembly includes: a core, comprising a core body and two tabs, with the two tabs respectively connected to both ends of the core body along its axis, the tabs and the end faces of the core body forming an open mounting space; and a reference structure, including a reference electrode and a lead-out member, the reference electrode being installed in either of the two mounting spaces, a first end of the lead-out member being electrically connected to the reference electrode, and a second end of the lead-out member extending out of the mounting space through the opening. This invention solves the problem of existing three-electrode core assemblies easily causing internal short circuits in the battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and more specifically, to a three-electrode winding assembly and a three-electrode cylindrical battery device. Background Technology

[0002] In recent years, lithium-ion batteries have experienced rapid development and widespread application as a high-energy-density, high-efficiency energy storage device. Furthermore, the performance requirements for lithium batteries, such as energy density, cycle life, and safety, have gradually increased. The potential change of a battery during charging and discharging is one of the important indicators for measuring its performance and health. In traditional battery design, the potential difference between the positive and negative electrodes is typically used to determine the battery's operating state. However, this measurement method cannot accurately analyze the polarization phenomenon inside the battery and is difficult to capture the minute potential changes during high-rate charging and discharging. Therefore, precise monitoring of the battery's internal potential has become particularly important, which usually requires a three-electrode system.

[0003] Three-electrode systems are widely used in laboratory research for electrochemical analysis. These systems consist of a reference electrode, a working electrode, and an auxiliary electrode. The reference electrode provides a stable potential benchmark, and the potential difference between the working electrode and the reference electrode is then precisely measured to evaluate the electrochemical characteristics of the electrode reactions. However, traditional three-electrode systems are primarily used for laboratory testing and are not suitable for direct application in batteries (unsuitable for integration into batteries) because of their complex structure, large footprint, susceptibility to internal short circuits, and difficulty in integrating them into existing battery manufacturing processes.

[0004] In existing technologies, some improved three-electrode designs have attempted to integrate the reference electrode into the battery. However, most of these designs require the introduction of additional components between the positive and negative electrodes, posing a certain threat to battery safety. For example, in Chinese patents CN116936903A, CN107607873A, and CN117790868A, the reference electrode is placed directly between the positive and negative electrodes. This may increase the risk of internal short circuits in the battery, especially when the battery is subjected to mechanical shock or extreme operating conditions. Furthermore, during cycling, the reference electrode implanted between the positive and negative electrodes is subjected to compressive stress due to the expansion and contraction pressure of the cell, which can also lead to poor stability. Utility Model Content

[0005] The main objective of this invention is to provide a three-electrode winding assembly and a three-electrode cylindrical battery device to solve the problem that the existing three-electrode winding assembly is prone to causing internal short circuits in the battery.

[0006] To achieve the above objectives, this utility model provides a three-electrode core assembly, comprising: a core, including a core body and two electrode tabs, wherein the two electrode tabs are respectively connected to both ends of the core body along the axis of the core body, and the electrode tabs and the end faces of the core body form an installation space with an opening; and a reference structure, including a reference electrode and a lead-out member, wherein the reference electrode is installed in either of the two installation spaces, the first end of the lead-out member is electrically connected to the reference electrode, and the second end of the lead-out member extends out of the installation space through the opening.

[0007] Furthermore, the reference electrode is an annular structure with a clearance through hole, which is connected to the central hole of the core body.

[0008] Furthermore, the lead-out component includes a radial extension section, a bent connecting section, and an axial extension section. The radial extension section extends into the inner wall of the avoidance through hole and extends radially along the annular structure. The axial extension section extends axially away from the core body along the annular structure. The bent connecting section is used to connect the radial extension section and the axial extension section.

[0009] Furthermore, the reference electrode includes a diaphragm layer, a conductive layer, and an insulating layer. The diaphragm layer is disposed on the end face of the core body, the insulating layer is located on the side of the diaphragm layer opposite to the core body, and the conductive layer is located between the diaphragm layer and the insulating layer.

[0010] Furthermore, the projected area of ​​the conductive layer on the separator layer is smaller than the area of ​​the separator layer, and the circumferential edge of the conductive layer and the circumferential edge of the separator layer are spaced apart.

[0011] Furthermore, the insulating layer is made of sealant, which coats the conductive layer and is bonded to the diaphragm layer to encapsulate the conductive layer on the diaphragm layer.

[0012] Furthermore, the lead-out component includes a lead-out member and an insulating portion covering the outer periphery of the lead-out member. The first end of the lead-out member extends out of the insulating portion and is electrically connected to the reference electrode, and the second end of the lead-out member extends out of the insulating portion to form a test terminal.

[0013] Furthermore, the two tabs are a positive tab and a negative tab. A reference electrode is provided in the mounting space formed by the negative tab and the end face of the core body. The negative tab is pressed against the reference electrode.

[0014] According to another aspect of the present invention, the present invention provides a three-electrode cylindrical battery device, including a housing and the aforementioned three-electrode winding assembly installed within the housing.

[0015] Furthermore, the three-electrode cylindrical battery device also includes two current collectors located at both ends of the core along the axis of the core. The current collector located on the side of the reference electrode away from the core body is provided with a liquid injection hole, which allows the lead-out component to pass through.

[0016] By applying the technical solution of this utility model, the reference electrode can be embedded in the installation space formed by the end face of the core body and the tab, and connected to the external measurement system through the lead-out component. This avoids placing the reference electrode directly between the positive and negative electrodes. In this way, the risk of internal short circuits in the battery can be avoided through non-invasive implantation, especially when the battery is subjected to mechanical impact or under extreme working conditions. Furthermore, the non-invasive implantation method can also avoid the reference electrode being subjected to compressive forces during the expansion and contraction of the battery during cycling, thereby ensuring that the performance of the reference electrode remains stable. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of an embodiment of the three-electrode cylindrical battery device of this utility model is shown;

[0019] Figure 2 It shows Figure 1 A schematic diagram of the structure of the three-electrode core assembly of a three-electrode cylindrical battery device;

[0020] Figure 3 It shows Figure 2 A cross-sectional view of the three-electrode winding assembly;

[0021] Figure 4 It shows Figure 2 Top view of the three-electrode winding assembly;

[0022] Figure 5 It shows Figure 2 A bottom view of the three-electrode winding assembly;

[0023] Figure 6 It shows Figure 2 A schematic diagram of the assembly structure of the diaphragm layer and lead-out components of the three-electrode winding core assembly;

[0024] Figure 7 It shows Figure 2 A schematic diagram of the assembly structure of the diaphragm layer, lead-out components and conductive layer of the three-electrode winding core assembly.

[0025] The above figures include the following reference numerals:

[0026] 11. Core body; 12. Electrode lug; 13. Opening; 14. Mounting space; 15. Center hole; 20. Reference electrode; 21. Clearance through hole; 22. Diaphragm layer; 23. Conductive layer; 24. Insulating layer; 30. Lead-out component; 31. Radial extension section; 32. Bending connection section; 33. Axial extension section; 34. Lead-out part; 35. Insulating part; 40. Collector plate; 41. Liquid injection hole; 50. Housing. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 7 As shown, an embodiment of this utility model provides a three-electrode core assembly, including: a core, comprising a core body 11 and two electrode tabs 12, the two electrode tabs 12 being connected to the two ends of the core body 11 along the axis of the core body 11, the electrode tabs 12 and the end faces of the core body 11 forming an installation space 14 with an opening 13; a reference structure, comprising a reference electrode 20 and a lead-out member 30, the reference electrode 20 being installed in either of the two installation spaces 14, the first end of the lead-out member 30 being electrically connected to the reference electrode 20, and the second end of the lead-out member 30 extending out of the installation space 14 through the opening 13.

[0029] In the above technical solution, the reference electrode 20 can be embedded in the installation space 14 formed by the end face of the core body 11 and the tab 12, and connected to the external measurement system through the lead-out component 30. This avoids placing the reference electrode directly between the positive and negative electrodes. In this way, the risk of internal short circuit in the battery can be avoided through non-invasive implantation, especially when the battery is subjected to mechanical impact or under extreme working conditions. In addition, the non-invasive implantation method can also avoid the reference electrode being subjected to compressive force during the battery cycle, thereby ensuring that the performance of the reference electrode remains stable.

[0030] In existing technologies, the reference electrode is implanted between the positive and negative electrodes. However, this method requires additional internal space, which to some extent affects the battery's energy density. Furthermore, existing implantation methods require significant modifications to the battery design and manufacturing process, increasing production costs and process complexity. Therefore, integrating the reference electrode into the existing cylindrical battery structure without increasing design complexity or affecting energy density, to accurately monitor internal potential changes during charging and discharging, has become a significant challenge in the current lithium-ion battery technology field. In this application, the reference electrode 20 is embedded within the mounting space 14 formed by the end face of the core body 11 and the tab 12. This utilizes the space between the core body 11 and the tab 12, eliminating the need for additional space to install the reference electrode, thereby improving battery energy density. Moreover, the non-invasive implantation method utilizes the existing battery space, requiring no significant modifications to the battery design and manufacturing process, thus reducing production costs and process complexity.

[0031] One known method for integrating a reference electrode into a battery involves implanting three electrodes in a central hole of a cylinder (e.g., Chinese Patent Publication No. CN106099164B and International Patent Application Publication No. WO2020045928A1). This method suffers from the problem of the reference electrode being too far from the active material layer, leading to significant polarization during testing. Furthermore, Chinese Patent Publication No. CN220492013U implants the reference electrode in an annular space at the top of the cell, which also suffers from the problem of the reference electrode being too far from the active material layer. In this application, the reference electrode 20 is embedded between the tab portion 12 and the end face of the core body 11. This allows the reference electrode 20 to be closer to the active material layer, reducing the impact of polarization on the measurement results and thus improving the accuracy of measuring potential changes within the battery.

[0032] The solution in Chinese patent publication number CN115763998A has the problem of an excessively small reference area. Therefore, as Figures 2 to 7 As shown in the embodiment of this utility model, the reference electrode 20 is an annular structure with a clearance through hole 21, which is connected to the center hole 15 of the core body 11.

[0033] In the above technical solution, by setting the reference electrode 20 as a ring structure, the area of ​​the reference electrode 20 can be effectively increased. The reference electrode 20 is provided with a clearance through hole 21 that communicates with the central hole 15 of the core body 11. In this way, the contact area between the reference electrode 20 and the battery active material can be increased, thereby improving the sensitivity and accuracy of potential monitoring. Moreover, the ring design combined with the central hole not only makes full use of the limited space inside the battery, but also ensures the free flow of electrolyte through the clearance through hole 21, maintaining the thermodynamic balance inside the battery.

[0034] In some embodiments, the reference electrode 20 may also be a square structure or a circular structure.

[0035] like Figure 6 As shown in the embodiment of the present invention, the lead-out member 30 includes a radial extension section 31, a bent connecting section 32 and an axial extension section 33. The radial extension section 31 extends into the inner wall surface of the avoidance through hole 21 and extends radially along the annular structure. The axial extension section 33 extends axially away from the core body 11 along the annular structure. The bent connecting section 32 is used to connect the radial extension section 31 and the axial extension section 33.

[0036] In the above technical solution, the radial extension section 31 extends deep into the inner wall of the through hole 21 and extends radially along the annular reference electrode 20, which can increase the contact area between the lead-out member 30 and the reference electrode 20, thereby improving the current conduction efficiency and signal stability. The axial extension section 33 extends axially along the annular structure to the top of the battery, which can ensure that the lead-out member 30 can be safely and conveniently connected from the inside of the battery to the outside, facilitating real-time monitoring of the battery's electrochemical performance. The presence of the curved connection section 32 provides a smooth transition between the radial extension section 31 and the axial extension section 33.

[0037] like Figure 2 , Figure 3 and Figure 7 As shown in the embodiment of this utility model, the reference electrode 20 includes a diaphragm layer 22, a conductive layer 23 and an insulating layer 24. The diaphragm layer 22 is disposed on the end face of the core body 11, the insulating layer 24 is located on the side of the diaphragm layer 22 away from the core body 11, and the conductive layer 23 is located between the diaphragm layer 22 and the insulating layer 24.

[0038] In the above technical solution, the separator layer 22 is disposed on the end face of the core body 11 and can act as a barrier between the conductive layer 23 and the electrode material to isolate electrons and allow ions to pass through, thereby testing the battery potential without internal short circuit; the conductive layer 23 is placed between the separator layer 22 and the insulating layer 24. With the protection of the insulating layer 24, unnecessary contact between the conductive layer 23 and the battery casing or other non-electrode components can be avoided, reducing the risk of short circuit and improving the overall safety of the system.

[0039] like Figure 7 As shown, in the embodiment of this utility model, the projected area of ​​the conductive layer 23 on the diaphragm layer 22 is smaller than the area of ​​the diaphragm layer 22, and the circumferential edge of the conductive layer 23 and the circumferential edge of the diaphragm layer 22 are spaced apart.

[0040] By adopting the above settings, direct contact between the reference electrode 20 and the positive and negative electrode foils inside the cell can be avoided, thereby reducing the risk of short circuit and improving the reliability of the battery.

[0041] like Figure 7 As shown, in some embodiments, the conductive layer 23 is annular, the diaphragm layer 22 is annular, and along the radial direction of the annular conductive layer 23, there is a gap between the inner peripheral edge of the annular conductive layer 23 and the inner peripheral edge of the annular diaphragm layer 22, and there is a gap between the outer peripheral edge of the annular conductive layer 23 and the outer peripheral edge of the annular diaphragm layer 22.

[0042] In some embodiments, the conductive layer 23 is square, the diaphragm layer 22 is square, and the outer peripheral edge of the conductive layer 23 and the outer peripheral edge of the diaphragm layer 22 are spaced apart, so that the diaphragm layer 22 forms a square border on the outer periphery of the conductive layer 23; similarly, the conductive layer 23 is circular, the diaphragm layer 22 is circular, and the diaphragm layer 22 forms a circular border on the outer periphery of the conductive layer 23.

[0043] like Figure 2 and Figure 3 As shown in the embodiment of this utility model, the insulating layer 24 is made of sealant, which covers the conductive layer 23 and is bonded to the diaphragm layer 22 to encapsulate the conductive layer 23 on the diaphragm layer 22.

[0044] In the above technical solution, the sealant not only wraps around the conductive layer 23 to ensure stable transmission of its electrical properties, but also forms a seamless bond with the separator layer 22. Under the dual protection mechanism, it effectively prevents interference from external impurities and ensures the accuracy of potential measurement. Specifically, the edge spacing between the separator layer 22 and the conductive layer 23, coupled with the encapsulation effect of the sealant, can form an isolated space. This space can both ensure the free passage of ions and promote the smooth progress of electrochemical reactions, and prevent the direct flow path of electrons, thus blocking the possibility of internal short circuits and improving the safety of battery operation.

[0045] like Figure 3 As shown in the embodiment of this utility model, the lead-out member 30 includes a lead-out member 34 and an insulating portion 35 covering the outer periphery of the lead-out member 34. The first end of the lead-out member 34 extends out of the insulating portion 35 and is electrically connected to the reference electrode 20. The second end of the lead-out member 34 extends out of the insulating portion 35 to form a test end.

[0046] In the above technical solution, the first end of the lead-out member 34 is electrically connected to the reference electrode 20, and the second end of the lead-out member 34 extends out of the insulating part 35 to form a test end, which can connect the inside of the battery to external testing instruments to realize the potential monitoring inside the battery. Moreover, the insulating part 35 can isolate electrical interference and short circuit risk, ensuring the safety of the testing process.

[0047] In one embodiment, the lead-out member 34 is a copper wire, and the insulating part 35 is an insulating sleeve that is sleeved on the outer periphery of the copper wire. The copper wire is electrically connected to the conductive layer 23 of the reference electrode 20.

[0048] Specifically, the conductive layer 23 is made of an annular lithium metal strip, the separator layer 22 is made of an annular separator, and the insulating layer 24 is made of an annular encapsulating adhesive. The annular separator is in the first layer, the lithium metal strip and the lead-out member 30 are in the second layer, located below the annular separator. The copper wire of the lead-out member 30 is connected to the lithium metal strip in this layer to conduct electricity. The annular encapsulating adhesive is in the third layer. The encapsulating adhesive is mainly responsible for bonding the annular separator and the annular lithium metal strip. The annular separator and the encapsulating adhesive together wrap the annular lithium metal strip inside.

[0049] like Figure 1 As shown in the embodiment of this utility model, the two electrode tabs 12 are divided into a positive electrode tab and a negative electrode tab. A reference electrode 20 is provided in the mounting space 14 formed by the negative electrode tab and the end face of the core body 11. The negative electrode tab is pressed against the reference electrode 20.

[0050] In the above technical solution, by using the negative electrode tab to press and fix the reference electrode 20, the reference electrode 20 can be stably fixed in the installation space 14. Specifically, the reference electrode 20 is first inserted into the installation space 14, and then the negative electrode tab is pressed against the reference electrode 20 by the negative electrode tab flattening process. This can efficiently utilize the space between the full electrode tab at the center hole of the cylindrical battery and the core body 11, adapting to the original cell design. In this way, not only can the installation stability of the reference electrode 20 be improved, but the complexity of the production process can also be reduced.

[0051] In one embodiment, a reference electrode 20 may be provided in the mounting space 14 formed by the positive electrode ear and the end face of the core body 11, the positive electrode ear is pressed against the reference electrode 20, and a through hole for the lead-out member 30 is provided on the positive electrode current collector.

[0052] like Figure 1 As shown, an embodiment of the present invention provides a three-electrode cylindrical battery device, including a housing 50 and the aforementioned three-electrode winding assembly installed within the housing 50.

[0053] The above-mentioned three-electrode cylindrical battery device has all the advantages of the above-mentioned three-electrode winding assembly, which will not be repeated here.

[0054] like Figure 1 As shown in the embodiment of this utility model, the three-electrode cylindrical battery device further includes two current collectors 40. Along the axis of the core, the two current collectors 40 are located at both ends of the core. The current collector 40 located on the side of the reference electrode 20 away from the core body 11 is provided with a liquid injection hole 41, which allows the lead-out component 30 to pass through.

[0055] In the above technical solution, the three-electrode cylindrical battery device introduces two current collectors 40. This not only promotes the uniform distribution of current and enhances the conductivity of the battery, but also provides an injection hole 41 on the current collector 40 on the other side of the reference electrode 20 opposite to the core body 11. This hole not only carries the delivery of electrolyte and ensures effective wetting between the components inside the battery and activates the electrochemical reaction, but also allows the lead-out component 30 to pass through, thus bridging the reference electrode 20 and the external monitoring equipment.

[0056] In some embodiments, the two current collectors 40 are a positive current collector and a negative current collector, respectively. The positive current collector is connected to the positive current collector, and the negative current collector is connected to the negative current collector. The negative current collector is provided with a liquid injection hole 41. The positive current collector is welded between the positive current collector and the housing, and the negative current collector is welded between the negative current collector and the housing. The reference electrode 20 is installed between the negative current collector and the core body 11, and at the center hole of the core body 11.

[0057] The three-electrode cylindrical battery device of this application can make full use of the internal space of the cylindrical battery and is easy to implement in the production process.

[0058] In some embodiments, the core body 11 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet each have a tab on one side. The positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked and wound to form a cylindrical core (core body 11). The cylindrical core is installed in a housing. The positive and negative electrode tabs are located at both ends of the core body 11. A current collector is welded between the positive and negative electrode tabs and the housing. The reference electrode 20 is installed between the negative electrode tab and the core body 11, and the reference electrode 20 is correspondingly arranged with the center hole.

[0059] This application provides a safe, efficient, and simplified three-electrode cylindrical battery device for: First, improving the accuracy of potential measurement: by optimizing the position and structural design of the reference electrode 20, reducing the distance between the reference electrode 20 and the active material, increasing the area of ​​the reference electrode 20, and reducing the impact of polarization effect on the measurement results; Second, reducing safety risks: by eliminating the need to directly implant the reference electrode 20 between the positive and negative electrodes, reducing potential safety hazards caused by short circuits or leakage; Third, matching the production process: by directly introducing this reference electrode design into the existing cylindrical battery manufacturing process, without modifying the overall battery structure.

[0060] The three-electrode cylindrical battery device of this application can achieve:

[0061] First, high measurement accuracy: By using a ring-shaped reference electrode 20, the area of ​​the reference electrode 20 can be increased. It is implanted between the negative electrode ear and the core body 11 and fits against the end face of the core body 11, shortening the distance between the reference electrode 20 and the active material. This can reduce polarization during the measurement process in two ways.

[0062] Second, it is safe and reliable: non-invasive implantation, the reference electrode 20 does not need to be directly placed between the positive and negative electrodes, which can reduce the risk of internal short circuits and reduce structural instability caused by additional components.

[0063] Third, it facilitates mass production: the space between the full tab at the center hole of the cylindrical battery and the core body 11 can be utilized, and it can be directly added during the battery manufacturing process without making significant changes to the existing manufacturing process. This allows it to be implemented on existing production lines, thereby reducing production costs.

[0064] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: the reference electrode can be embedded in the installation space formed by the end face of the core body and the tab, and the connection with the external measurement system can be achieved through the lead-out component. This avoids placing the reference electrode directly between the positive and negative electrodes. In this way, the risk of internal short circuit in the battery can be avoided through non-invasive implantation, especially when the battery is subjected to mechanical impact or under extreme working conditions. Furthermore, the non-invasive implantation method can also avoid the reference electrode being subjected to compressive force during the battery's expansion and contraction during cycling, thereby ensuring that the performance of the reference electrode remains stable.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A three-electrode roll core assembly, characterized by, include: The core includes a core body (11) and two tabs (12). Along the axis of the core body (11), the two tabs (12) are respectively connected to both ends of the core body (11). The tabs (12) and the end face of the core body (11) form an installation space (14) with an opening (13). The reference structure (10) includes a reference electrode (20) and a lead-out member (30). The reference electrode (20) is installed in either of the two installation spaces (14). The first end of the lead-out member (30) is electrically connected to the reference electrode (20), and the second end of the lead-out member (30) extends out of the installation space (14) through the opening (13).

2. The three-electrode core assembly of claim 1, wherein The reference electrode (20) is an annular structure with a clearance through hole (21), which is connected to the center hole (15) of the core body (11).

3. The three-electrode core assembly of claim 2, wherein, The lead-out member (30) includes a radial extension section (31), a bent connecting section (32), and an axial extension section (33). The radial extension section (31) extends into the inner wall of the clearance through hole (21) and extends radially along the annular structure. The axial extension section (33) extends axially away from the core body (11) along the annular structure. The bent connecting section (32) is used to connect the radial extension section (31) and the axial extension section (33).

4. The three-electrode core assembly of any one of claims 1 to 3, wherein, The reference electrode (20) includes a diaphragm layer (22), a conductive layer (23), and an insulating layer (24). The diaphragm layer (22) is disposed on the end face of the core body (11). The insulating layer (24) is located on the side of the diaphragm layer (22) away from the core body (11). The conductive layer (23) is located between the diaphragm layer (22) and the insulating layer (24).

5. The three-electrode core assembly of claim 4, wherein, The projected area of ​​the conductive layer (23) on the membrane layer (22) is smaller than the area of ​​the membrane layer (22), and the circumferential edge of the conductive layer (23) is spaced apart from the circumferential edge of the membrane layer (22).

6. The three-electrode core assembly of claim 4, wherein, The insulating layer (24) is made of sealant, which covers the conductive layer (23) and is bonded to the diaphragm layer (22) to encapsulate the conductive layer (23) on the diaphragm layer (22).

7. The three-electrode core assembly of any one of claims 1 to 3, wherein, The lead-out component (30) includes a lead-out member (34) and an insulating portion (35) covering the outer periphery of the lead-out member (34). The first end of the lead-out member (34) extends out of the insulating portion (35) and is electrically connected to the reference electrode (20). The second end of the lead-out member (34) extends out of the insulating portion (35) to form a test terminal.

8. The three-electrode core assembly of any one of claims 1 to 3, wherein, The two electrode tabs (12) are divided into a positive electrode tab and a negative electrode tab. The reference electrode (20) is provided in the mounting space (14) formed by the negative electrode tab and the end face of the core body (11). The negative electrode tab is pressed against the reference electrode (20).

9. A three-electrode cylindrical battery device, characterized by The assembly includes a housing (50) and a three-electrode winding assembly according to any one of claims 1 to 8, which is mounted within the housing (50).

10. The three-electrode cylindrical battery device of claim 9, wherein, The three-electrode cylindrical battery device also includes two collector disks (40). Along the axis of the core, the two collector disks (40) are located at both ends of the core. The collector disk (40) located on the side of the reference electrode (20) away from the core body (11) is provided with a liquid injection hole (41). The liquid injection hole (41) allows the lead-out member (30) to pass through.

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