Three-electrode battery

Abstract

The utility model discloses a three-electrode battery, which comprises a shell, a first positive electrode part, a first negative electrode part, a second positive electrode part and a second negative electrode part, the battery cell is arranged in the shell, the battery cell is provided with a second positive electrode part and a second negative electrode part, the second positive electrode part is connected with the first positive electrode part, and the second negative electrode part is connected with the first negative electrode part; the explosion-proof structure is arranged on the shell, and the explosion-proof structure is provided with an opening; the reference electrode assembly is arranged in the opening in a penetrating mode, the part, located in the shell, of the reference electrode assembly is connected with the battery cell, and at least part of the part, located outside the shell, of the reference electrode assembly is constructed into a tab part. According to the three-electrode battery, the reference electrode assembly is arranged in the opening of the anti-explosion valve in the penetrating manner, and the reference electrode assembly fully utilizes the anti-explosion structure while exerting the effect of the reference electrode assembly, so that the overall structure of the three-electrode battery is simpler, the structure utilization rate is improved, additional design and manufacturing cost is not needed, and the overall cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and particularly to a three - electrode battery. Background Art

[0002] In the related art, a three - electrode battery introduces a reference electrode to monitor the potential changes of the positive electrode and the negative electrode relative to the third electrode, better study and analyze the electrochemical reactions of the positive electrode and the negative electrode inside the battery respectively, accurately locate the cause of cell failure, and be targeted when optimizing the battery design. However, in the related art, the three - electrode battery needs to be separately designed and manufactured, increasing the cost. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a three - electrode battery, which reduces the overall cost.

[0004] A three - electrode battery according to an embodiment of the utility model includes: a housing, on which a first positive electrode part and a first negative electrode part are provided; a battery cell, which is arranged inside the housing, the battery cell has a second positive electrode part and a second negative electrode part, the second positive electrode part is connected to the first positive electrode part, and the second negative electrode part is connected to the first negative electrode part; an explosion - proof structure, which is arranged on the housing, the explosion - proof structure has an opening; a reference electrode assembly, the reference electrode assembly passes through the opening, the part of the reference electrode assembly located inside the housing is connected to the battery cell, and at least part of the part of the reference electrode assembly located outside the housing is configured as an ear part.

[0005] In the three - electrode battery according to the embodiment of the utility model, by passing the reference electrode assembly through the opening of the explosion - proof valve, while the reference electrode assembly plays its own role, it makes full use of the explosion - proof structure, making the overall structure of the three - electrode battery simpler, improving the structural utilization rate, without increasing additional design and manufacturing costs, and reducing the overall cost.

[0006] In some embodiments, the reference electrode assembly includes: a conductive member, the conductive member passes through the opening; a protective member, the protective member is arranged on the outer surface of the conductive member to protect the conductive member.

[0007] In some embodiments, the protective member is configured as a soft film member, and the soft film member includes an adhesive layer, the adhesive layer faces the conductive member, and the adhesive layer at least adheres to the outer surface.

[0008] In some embodiments, the soft film member is configured as an aluminum - plastic film.

[0009] In some embodiments, the material of the conductive member is any one of silver, silver chloride, lithium, and copper.

[0010] In some embodiments, the conductive member is configured as a flexible conductive member.

[0011] In some embodiments, the three-electrode battery further includes: a first separator; the conductive member includes: a first sub-part that passes through the opening and extends outside the housing; and a second sub-part that is disposed inside the housing and is connected to the battery cell, and the first separator wraps the second sub-part.

[0012] In some embodiments, the battery cell includes a positive electrode sheet, a negative electrode sheet, and a second separator, the second separator is disposed between the positive electrode sheet and the negative electrode sheet, and the second sub-part is disposed on a side of the negative electrode sheet facing away from the positive electrode sheet.

[0013] In some embodiments, an included angle is provided between the first sub-part and the second sub-part.

[0014] In some embodiments, a gap space is provided between the battery cell and the housing, the first sub-part is disposed in the gap space, and the first sub-part extends outside the housing along the length direction of the battery cell.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of a three-electrode battery in an embodiment of the present utility model;

[0018] Figure 2 is a schematic position diagram of a battery cell and a reference electrode assembly in an embodiment of the present utility model;

[0019] Figure 3 is a schematic position diagram of a first sub-part, a second sub-part, a protection member, and a first separator in an embodiment of the present utility model;

[0020] Figure 4 is a schematic position diagram of an upper separator, a lower separator, and a second sub-part in an embodiment of the present utility model.

[0021] Reference Signs:

[0022] 100, three-electrode battery;

[0023] 1. Battery cell; 111. Negative electrode coating area; 112. Negative electrode blank current collector area; 121. Positive electrode coating area; 122. Positive electrode blank current collector area; 13. Second separator; 2. Reference electrode assembly; 3. Aluminum shell; 4. Negative electrode cover plate; 41. Negative electrode terminal; 42. Explosion-proof structure; 5. Positive electrode cover plate; 51. Positive electrode terminal; 52. Liquid injection hole; 6. Electrode tab; 20. Gap space; 21. Second sub-part; 22. First sub-part; 23. Protective member; 24. First separator; 241. Upper separator; 242. Lower separator; 25. Conductive member. Detailed implementation mode

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0026] In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features, used to distinguish and describe features, without order or importance.

[0027] In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] The three-electrode battery 100 of the present invention will be described below with reference to the drawings.

[0030] Referring to Figures 1 to 4 , a three - electrode battery 100 according to an embodiment of the present utility model includes: a housing, a battery cell 1, an explosion - proof structure 42, and a reference electrode assembly 2.

[0031] The housing is provided with a first positive electrode part and a first negative electrode part. The battery cell 1 is disposed inside the housing. The battery cell 1 has a second positive electrode part and a second negative electrode part. The second positive electrode part is connected to the first positive electrode part, and the second negative electrode part is connected to the first negative electrode part. The explosion - proof structure 42 is disposed on the housing. The explosion - proof structure 42 has an opening. The reference electrode assembly 2 is inserted through the opening. A part of the reference electrode assembly 2 located inside the housing is connected to the battery cell 1, and at least a part of the reference electrode assembly 2 located outside the housing is configured as an electrode tab 6.

[0032] Among them, the battery cell 1 is disposed inside the housing. The second positive electrode part on the battery cell 1 is connected to the first positive electrode part on the housing, and the second negative electrode part on the battery cell 1 is connected to the first negative electrode part on the housing. A reaction occurs inside the battery cell 1, and the battery cell 1 outputs electrical energy outward, or electrical energy is input into the battery cell 1 from outside. The explosion - proof structure 42 is installed on the housing. The explosion - proof structure 42 can be an explosion - proof valve or a structure integrally formed on the housing. The explosion - proof structure 42 is provided with an opening. In some cases, pressure is released outward through the opening, such as in the case of explosion or leakage of the battery cell 1.

[0033] In the related art, a reference electrode is introduced into the three - electrode battery to monitor the potential changes of the positive electrode and the negative electrode relative to the third electrode, better study and analyze the electrochemical reactions of the positive electrode and the negative electrode inside the battery respectively, accurately locate the cause of battery cell failure, and be targeted when optimizing the battery design. However, in the related art, the three - electrode battery needs to be separately designed and manufactured, increasing the cost.

[0034] Specifically, in the related art, a reference electrode column is provided inside the three - electrode battery. In order to adapt to the reference electrode column, the cover plate needs to be specially designed, and special tooling equipment needs to be developed for the reference electrode column, increasing the equipment cost.

[0035] In this application, by providing the reference electrode assembly 2 and using the opening on the explosion - proof structure 42, making full use of each part of the structure, the reference electrode assembly 2 is inserted through the opening. One part of the reference electrode assembly 2 is connected to the battery cell 1, and the other part is the electrode tab 6, realizing the function of the reference electrode. The overall structure is simple, without the need to design special tooling equipment, and reducing the cost of each part.

[0036] According to the three - electrode battery 100 of the embodiments of the present utility model, by passing the reference electrode assembly 2 through the opening of the explosion - proof valve, while the reference electrode assembly 2 exerts its own effect, it makes full use of the explosion - proof structure 42, making the overall structure of the three - electrode battery 100 simpler, improving the structural utilization rate, without the need to increase additional design and manufacturing costs, and reducing the overall cost.

[0037] Referring Figures 1 to 4 , in some embodiments, the reference electrode assembly 2 includes: a conductive member 25 and a protective member 23.

[0038] The conductive member 25 is passed through the opening. The protective member 23 is arranged on the outer surface of the conductive member 25 to protect the conductive member 25.

[0039] Among them, the conductive member 25 is conductive, the conductive member 25 is connected to the battery cell 1 and extends out of the housing, providing a standard potential for studying the potential changes of the positive and negative electrodes of the three - electrode battery 100. The conductive member 25 is passed through the opening, and the protective member 23 plays a protective role to prevent the conductive member 25 from being damaged.

[0040] In the above - mentioned solution, by arranging the protective member 23 on the conductive member 25 to protect the conductive member 25, and then passing the reference electrode assembly 2 through the opening, it is avoided that the opening damages the conductive member 25. For example, in the related art, the sharp part at the opening position cuts the conductive member. The embodiments of the present utility model reduce the probability of damage to the conductive member 25, enabling the three - electrode battery 100 to always work and increasing the service life.

[0041] Specifically, the conductive member 25 is a conductive copper wire, and the protective member 23 is an aluminum - plastic film. The aluminum - plastic film wraps around the conductive copper wire to protect the conductive copper wire from being cut by the sharp part at the opening. At the same time, it can be understood that the aluminum - plastic film provides a certain strength for the conductive copper wire to maintain the shape of the conductive copper wire, enabling the conductive copper wire to easily pass through the opening. Of course, the conductive member 25 can also be a conductive member 25 made of other materials, such as silver, silver chloride, lithium, etc. The protective member 23 can also be a protective member 23 made of other materials, such as polyimide composite film, polypropylene composite film, or copper - plated composite material, etc.

[0042] Referring Figures 1 to 4 , in some specific embodiments, the protective member 23 is not only located at the position corresponding to the opening on the conductive member 25, but the protective member 23 also extends into the housing to isolate the electrolyte in the housing from the conductive member 25, avoiding direct contact between the conductive member 25 and the electrolyte.

[0043] Referring Figures 1 to 4 , in some specific embodiments, the protective member 23 is not only located at the position corresponding to the opening on the conductive member 25, but the protective member 23 also extends outside the housing to prevent the part of the conductive member 25 outside the housing from being damaged, providing all - around protection.

[0044] In some embodiments, the protective member 23 is configured as a soft film member, and the soft film member includes an adhesive layer that faces the conductive member 25 and adheres to at least the outer surface.

[0045] Wherein, the soft film member has a certain flexibility and can undergo plastic deformation, and the adhesive layer enables the soft film member to adhere to the conductive member 25.

[0046] In the above solution, by configuring the protective member 23 as a soft film member, using the soft characteristics of the soft film member itself, and at the same time using the adhesive layer to closely adhere the soft film member to the surface of the conductive member 25, voids between the soft film member and the conductive member 25 are avoided, thereby preventing the electrolyte in the housing from seeping out of the voids to the outside of the housing due to capillary action, preventing the three - electrode battery 100 from leaking liquid, and ensuring the test accuracy.

[0047] Specifically, the soft film member is an aluminum - plastic film, which includes an aluminum foil layer, a plastic layer, and an adhesive layer, and the aluminum - plastic film is wrapped around the conductive member 25. Of course, the soft film member can also be other materials, such as a polyimide composite film, a polypropylene composite film, or a copper - plated plastic film, etc. provided with an adhesive layer.

[0048] In some embodiments, the soft film member is configured as an aluminum - plastic film.

[0049] Wherein, the aluminum - plastic film includes an aluminum foil layer, a plastic layer, and an adhesive layer. The aluminum - plastic film has excellent barrier properties, mechanical strength, and chemical corrosion resistance, can provide an excellent barrier effect, protect the internal materials, and at the same time resist a certain amount of tensile and puncture forces. Moreover, the aluminum - plastic film has good tolerance to many chemical substances and is not easily corroded.

[0050] In the above solution, using the aluminum - plastic film to protect the conductive member 25 and making full use of the characteristics of the aluminum - plastic film itself improves the overall safety and makes the whole more reliable.

[0051] In some embodiments, the material of the conductive member 25 is any one of silver, silver chloride, lithium, and copper.

[0052] Among them, silver, silver chloride, lithium, and copper can all conduct electricity. The material of the conductive member 25 can be silver, or silver chloride, or lithium, or copper to achieve the conductive effect.

[0053] In the above solution, by setting the material of the conductive member 25 to any one of silver, silver chloride, lithium, and copper, various materials can be used, and the conductive effect is preferably achieved.

[0054] In some embodiments, the conductive member 25 is configured as a flexible conductive member.

[0055] Among them, the flexible conductive member has a certain flexibility. For example, the flexible conductive member is a conductive copper wire, or the flexible conductive member is a conductive silver wire, or other conductive wires.

[0056] In the above solution, by constructing the conductive member 25 as a flexible conductive member and utilizing the relatively soft characteristic of the flexible conductive member, it is convenient for the flexible conductive member to be installed in the housing. The flexible conductive member can be more conveniently threaded through various gaps, improving the convenience.

[0057] Refer to Figure 2 、 Figure 3 , in some embodiments, the three - electrode battery 100 further includes: a first separator 24, and the conductive member 25 includes: a first sub - part 22 and a second sub - part 21.

[0058] The first sub - part 22 passes through the opening and extends outside the housing. The second sub - part 21 is disposed inside the housing and is connected to the battery cell 1, and the first separator 24 wraps the second sub - part 21.

[0059] Among them, the first separator 24 allows ions to pass through. When installing the conductive member 25, it avoids the direct overlap of the conductive member 25 with the positive electrode plate and the negative electrode plate, preventing the occurrence of a short circuit. The second sub - part 21 is indirectly connected to the battery cell 1 through the first separator 24.

[0060] In the above solution, by setting the first separator 24 to wrap the second sub - part 21 and using the first separator 24 to isolate the second sub - part 21 from the positive electrode plate and the negative electrode plate, the occurrence of a short circuit is avoided, making the three - electrode battery 100 stable and reliable.

[0061] Specifically, the material of the first separator 24 can be a polyolefin - based separator, a non - woven fabric separator, a ceramic separator, or a composite separator, etc.

[0062] In some specific embodiments, the conductive copper wire includes a pure copper wire inside and an enameled layer outside the pure copper wire. The diameter of the pure copper wire can be any value from 10 to 200 um, and the thickness of the enameled layer is any value from 1 to 3 um. The intercepted length of the pure copper wire is cut according to the size of the battery cell 1. The pure copper wire has two forms in the length direction. One end is the pure copper wire with the enameled layer removed, and the length of the pure copper wire is any value from 0.5 to 1 cm. For example, the length of the pure copper wire with the enameled layer removed is about 0.5 cm, and the diameter of the pure copper wire is 56 um. Removing the enameled layer to expose the pure copper wire is for the deposition of lithium ions to form a lithium reference electrode, which is used to monitor the state change of the positive and negative electrodes in the battery cell 1. The pure copper wire with the enameled layer removed is constructed as the second sub - part 21; the remaining length of the pure copper wire does not have the enameled layer removed, and the diameter of this part of the conductive copper wire is 60 um. The pure copper wire with the enameled layer removed is wrapped with the first separator 24 to ensure that when implanting the stacked battery cells, the pure copper wire with the enameled layer removed does not directly overlap with the positive and negative electrode plates, preventing the occurrence of a short circuit.

[0063] Further, a length of 2 to 5 cm, such as 2 cm, is reserved at the end of the pure copper wire without removing the enameled layer, and the other parts are wrapped with aluminum-plastic film and heat-sealed to completely seal the pure copper wire and the aluminum-plastic film. This part of the structure is the first sub-part 22. The end of the pure copper wire without aluminum-plastic film wrapping is used for electrically connecting with an external nickel tab to construct the tab part 6.

[0064] Referring to Figure 2 , in some embodiments, the part of the reference electrode assembly 2 located inside the housing is connected to the battery cell 1. The battery cell 1 is a stacked battery cell. The reference electrode assembly 2 can be implanted into the stacked battery cell, either on the outermost layer of the stacked battery cell or into any layer of the stacked battery cell.

[0065] When the reference electrode assembly 2 is implanted into a non-outermost layer of the stacked battery cell, the placement positions of the implanted reference electrode assembly 2 and the adjacent positive electrode plate and negative electrode plate are in sequence: positive electrode plate, second separator 13, first separator 24, second sub-part 21, first separator 24, negative electrode plate. When the reference electrode assembly 2 is implanted into the outermost layer of the stacked battery cell, the placement positions of the implanted reference electrode assembly 2 and the adjacent positive electrode plate and negative electrode plate are in sequence: first separator 24, second sub-part 21, first separator 24, second separator 13, negative electrode plate.

[0066] Referring to Figure 4 , in some specific embodiments, the first separator 24 includes an upper separator 241 and a lower separator 242.

[0067] In some specific embodiments, the battery cell 1 includes a positive electrode plate, a negative electrode plate, and a second separator 13. The second separator 13 is disposed between the positive electrode plate and the negative electrode plate, and the second sub-part 21 is disposed on the side of the negative electrode plate facing away from the positive electrode plate.

[0068] Among them, the battery cell 1 is a stacked battery cell. For example, the positive electrode plate, the second separator 13, and the negative electrode plate are stacked in sequence. The second sub-part 21 is disposed on the side of the negative electrode plate facing away from the positive electrode plate, and the second sub-part 21 is used to monitor the state changes of the positive and negative electrodes in the battery cell 1.

[0069] In the above solution, by disposing the second sub-part 21 on the side of the negative electrode plate facing away from the positive electrode plate and using the second sub-part 21 to monitor the state changes of the positive and negative electrodes in the battery cell 1, the method is simple and easy to implement.

[0070] Referring to Figure 1 、 Figure 2 , in some embodiments, an included angle is provided between the first sub-part 22 and the second sub-part 21.

[0071] Among them, the second sub-part 21 is inclined relative to the first sub-part 22, and there is a certain included angle between the first sub-part 22 and the second sub-part 21.

[0072] In the above solution, by setting the relatively inclined first sub - part 22 and the second sub - part 21, the first sub - part 22 is passed through the opening, the second sub - part 21 is located inside the housing and is connected to the battery cell 1, and the inclined second sub - part 21 adapts to the environment inside the housing, so that the connection between the conductive part 25 and the battery cell 1 is more stable.

[0073] Specifically, the second sub - part 21 can be perpendicular to the first sub - part 22, the second sub - part 21 can also form an acute angle with the first sub - part 22, or can also form an obtuse angle.

[0074] Refer to Figure 1 , in some embodiments, a gap space 20 is provided between the battery cell 1 and the housing, the first sub - part 22 is provided in the gap space 20, and the first sub - part 22 extends along the length direction of the battery cell 1 to the outside of the housing.

[0075] Among them, the battery cell 1 is located inside the housing, there is a gap space 20 between the battery cell 1 and the inner wall of the housing. The first sub - part 22 is installed using the gap space 20. The gap space 20 extends along the length direction of the battery cell 1, and the first sub - part 22 also extends along the length direction, and the two fit together.

[0076] In the above solution, by setting the first sub - part 22 that extends along the length direction of the battery cell 1, the inner gap space 20 inside the housing is fully utilized, the overall structure of the three - electrode battery 100 is more compact, and the overall volume is reduced.

[0077] Refer to Figure 2 , in some embodiments, the positive electrode plate includes a positive electrode dressing area 121 coated with positive electrode active material and a positive electrode blank current collector area 122 for electrically connecting to the first positive electrode part. The positive electrode blank current collector area 122 is configured as the second positive electrode part. The negative electrode plate includes a negative electrode dressing area 111 coated with negative electrode active material and a negative electrode blank current collector area 112 for electrically connecting to the first negative electrode part. The negative electrode blank current collector area 112 is configured as the second negative electrode part.

[0078] Refer to Figure 1 , in some specific embodiments, the housing includes an aluminum shell 3 and a cover plate.

[0079] The aluminum shell 3 is a container for containing the stacked battery cells. The cover plate includes a positive electrode cover plate 5 and a negative electrode cover plate 4. The positive electrode cover plate 5 is provided with a first positive electrode part, and the first positive electrode part is configured as a positive electrode post 51. The negative electrode cover plate 4 is provided with a first negative electrode part, and the first negative electrode part is configured as a negative electrode post 41. The cover plate is provided with a liquid injection hole 52 and an explosion - proof valve. The liquid injection hole 52 and the explosion - proof valve can be on the same cover plate, or can also be on different cover plates. The liquid injection hole 52 is used for injecting the electrolyte required for the battery cell 1. The explosion - proof valve is used for discharging the internal gas when the battery cell 1 is out of control due to heat.

[0080] In some specific embodiments, the cover plate and the aluminum shell 3 are sealed by laser welding, the opening of the explosion-proof valve is sealed with adhesive, and the sealed battery is manufactured according to the normal baking, liquid injection, formation, and grading processes of a two-electrode aluminum shell 3 battery, obtaining a three-electrode lithium-ion battery with an aluminum shell 3.

[0081] Other configurations and operations of the three-electrode battery 100 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0082] In the description of this specification, the description with reference to terms such as "embodiment", "example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0083] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A three-electrode battery, characterized in that: include: A shell, wherein a first positive electrode portion and a first negative electrode portion are provided on the shell; A battery cell (1), the battery cell (1) being arranged in the shell, the battery cell (1) comprising a second positive electrode portion and a second negative electrode portion, the second positive electrode portion being connected to the first positive electrode portion, and the second negative electrode portion being connected to the first negative electrode portion; An explosion-proof structure (42), the explosion-proof structure (42) being arranged on the housing, the explosion-proof structure (42) having an opening; A reference electrode assembly (2), wherein the reference electrode assembly (2) is inserted into the opening, the portion of the reference electrode assembly (2) located inside the shell is connected to the battery cell (1), and the portion of the reference electrode assembly (2) located outside the shell is at least partially configured as a pole ear portion (6).

2. The three-electrode battery according to claim 1, characterized in that: The reference electrode assembly (2) comprises: A conductive member (25), wherein the conductive member (25) is disposed through the opening; A protective member (23) is arranged on the outer surface of the conductive member (25) to protect the conductive member (25).

3. The three-electrode battery according to claim 2, characterized in that: The protective member (23) is constructed as a soft film member, the soft film member comprises an adhesive layer, the adhesive layer faces the conductive member (25), and the adhesive layer at least adheres to the outer surface.

4. The three-electrode battery according to claim 3, characterized in that: The soft film piece is constructed of an aluminum-plastic film.

5. The three-electrode battery according to claim 2, characterized in that: The conductive element (25) is made of any one of silver, silver chloride, lithium and copper.

6. The three-electrode battery according to claim 2, characterized in that: The conductive member (25) is configured as a flexible conductive member (25).

7. The three-electrode battery according to claim 2, characterized in that: Also includes: A first isolation film (24), the conductive member (25) comprises: A first sub-portion (22), the first sub-portion (22) is disposed through the opening and extends outside the shell; A second sub-section (21), the second sub-section (21) is arranged in the shell and connected to the battery core (1), and the first isolation film (24) wraps the second sub-section (21).

8. The three-electrode battery according to claim 7, characterized in that: The battery cell (1) comprises a positive electrode sheet (12), a negative electrode sheet (11) and a second isolation film, wherein the second isolation film is arranged between the positive electrode sheet (12) and the negative electrode sheet (11), and the second sub-section (21) is arranged on a side of the negative electrode sheet (11) facing away from the positive electrode sheet (12).

9. The three-electrode battery according to claim 7, characterized in that: An included angle is provided between the first sub-portion (22) and the second sub-portion (21).

10. The three-electrode battery according to claim 9, characterized in that: A gap space (20) is provided between the battery core (1) and the shell, the first sub-portion (22) is provided in the gap space (20), and the first sub-portion (22) extends to the outside of the shell along the length direction of the battery core (1).

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