Three-electrode battery and top cover

Abstract

The utility model discloses a three-electrode battery and a top cover, and provides the three-electrode battery and the top cover which are internally provided with a reference electrode, so that the destructive operation of the battery is reduced, and the risks of short circuit and moisture invasion are reduced. The reference electrode is pre-embedded in the diaphragm by using a copper wire, so that the stability is enhanced, the test continuity and accuracy are ensured, and the battery test safety is improved. The design is modularized, assembly and maintenance are convenient, copper wire pre-embedding avoids secondary oxidation, and the potential acquisition accuracy is improved. In addition, the ring-like elastic piece fixes the reference pole jack and the contact pin, the fastening nut and the sealing ring ensure the sealing performance, external moisture and impurity invasion are reduced, and the safety and the reliability of battery testing are further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a three-electrode battery and a top cover. Background Art

[0002] In modern battery technology, lithium-ion batteries are widely used in various electronic devices and electric vehicles due to their high energy density and long life. However, lithium-ion batteries face various challenges during actual use, especially under extreme environmental conditions, such as low temperatures or high-rate charging, which can significantly affect battery performance. One key issue is the limited dynamics of lithium ions on the negative electrode surface, which prevents lithium ions from being embedded in the graphite interlayers in a timely manner, resulting in the deposition of metallic lithium on the negative electrode surface, a phenomenon known as lithium plating. Lithium plating not only reduces the battery's capacity and cycle life, but can also cause internal short circuits in the battery and even lead to safety accidents.

[0003] To deeply study and understand the electrochemical behavior of batteries under different operating conditions, researchers and engineers typically use a three-electrode testing system. This system consists of a working electrode, a counter electrode, and a reference electrode. The reference electrode provides a stable potential baseline for accurately measuring potential changes at the working and counter electrodes. This system allows for in-situ detection and analysis of electrochemical reactions within the battery by separately monitoring the potential changes of the positive and negative electrodes relative to the reference electrode.

[0004] However, existing technologies have some problems when using reference electrodes. Traditional methods usually use lithium-plated copper wire as a reference electrode. During the battery cell assembly stage, the battery cell needs to be disassembled, and copper wire with a diaphragm 6 is placed on the surface of the positive and negative electrode sheets, and the disassembled battery cell is manually restored. Then, the reference electrode is led out of the aluminum shell by destroying the top cover of the aluminum shell, and the gap in the cover is sealed with AB glue. Although this method can monitor the electrochemical behavior inside the battery, it has several significant disadvantages.

[0005] First, by destroying the battery cell to implant the reference electrode, human intervention increases the risk of battery short circuits, which may cause the three-electrode battery cell to be scrapped, thus affecting the accuracy of the test results. Secondly, the reference electrode is led out by destroying the aluminum shell cover and filling the gap with AB glue. This will destroy the isolation system between the inside and outside of the battery cell, increase the risk of external moisture intrusion, and thus affect the stability and safety of the battery. Finally, the reference electrode is composed only of copper wire and lacks additional protection measures. There is a risk of breakage, which will not only affect the continuity and accuracy of the test, but also pose a threat to the safety of the battery.

[0006] To address these issues, it is crucial to develop new reference electrode implantation technologies to improve the safety and accuracy of battery testing. Summary of the Invention

[0007] In response to the problems in the prior art, the utility model discloses a three-electrode battery and a top cover. The utility model avoids destructive operations on the battery in traditional methods by designing a new top cover structure for the three-electrode battery and pre-embedding a reference electrode inside the battery, thereby reducing the risks of battery short circuit and moisture intrusion. At the same time, the reference electrode of the utility model adopts a reference copper wire pre-embedded inside the diaphragm, which improves the stability of the reference electrode, thereby ensuring the continuity and accuracy of the test and improving the safety of the battery test.

[0008] The utility model is realized through the following technical solutions:

[0009] In the first aspect, the utility model provides a top cover of a three-electrode battery; the top cover includes at least one reference electrode penetrating the cover body; the reference electrode includes a group of reference plugs and reference electrode pins coaxially arranged in a vertical direction; the reference plugs and the reference electrode pins are fixedly connected by a ring-like elastic member; wherein the ring-like elastic member is used to be accommodated inside the reference plug, and the reference electrode pin is embedded and fixed through elastic expansion.

[0010] As some specific examples, the annular elastic member is preferably a crown spring.

[0011] As some specific examples, the cover body also includes an upper insulating layer and a lower insulating layer. The cover body is used to support the battery assembly. The reference electrode is set through the cover body, the upper insulating layer, and the lower insulating layer. The reference pole and the cover body are connected through the upper insulating layer and the lower insulating layer to prevent the reference pole from short-circuiting with other parts inside the battery, thereby ensuring the accuracy of testing the internal potential of the battery.

[0012] As some specific examples, the cover plate body includes at least one cover plate protrusion and at least one upper insulating layer, and the cover plate protrusion and the upper insulating layer are in a concave-convex fit, so as to achieve a tighter fixing effect;

[0013] Furthermore, the raised portion of the cover plate and the upper insulating layer are matched and combined through a covering contact angle, and the covering contact angle is in a chamfered form, which plays a role in protecting the cover plate body.

[0014] As some specific examples, the lower insulating layer includes at least one lower insulating layer protrusion that is in a concave-convex fit with the cover plate protrusion, which plays a role in tightly connecting the lower insulating layer and the cover plate body, and isolating the battery assembly to prevent the assembly from short circuiting.

[0015] In the above experimental scheme, the applicant also optimized the design of the fitting form of the reference electrode pin and the reference socket, so as to facilitate the stable and reliable insertion of the reference electrode pin into the reference socket of the top cover, avoiding loosening, displacement or impurities such as moisture entering due to loose fitting, which may cause a short circuit of the reference electrode; ensuring the stability and accuracy of the reference electrode pin during battery operation.

[0016] As some specific examples, the reference electrode pin is provided with a first positioning section and a first extension section at the bottom, and the reference electrode pin is designed as an integrated molding; the reference pin includes a reference pin top, a reference pin middle, and a reference pin bottom; the reference pin bottom has a concave platform, which forms a concave-convex interlocking with the first extension section of the reference pin, further serving to fix the reference pin. The first positioning section is located below the first extension section and extends beyond the bottom end face of the reference pin, facilitating welding connection with the reference copper wire inside the embedded battery; the reference pin top extends beyond the main cover plate; the reference pin bottom protrudes horizontally beyond the middle portion of the reference pin, serving to stabilize the reference pin.

[0017] As some specific examples, the top of the reference pin has an external thread structure and is provided with a detachable fastening nut for fixing the reference pole pin to ensure its stability during battery operation.

[0018] As some specific examples, a sealing ring is provided outside the reference plug, and the reference plug is connected to the cover body through the sealing ring; it plays a sealing role to prevent the electrode from short circuiting.

[0019] Furthermore, the sealing ring is provided with a third extending section and a fourth extending section. The third extending section extends upward beyond the cover plate body, capable of contacting the bottom surface of the fastening nut and threadedly engaging with the top of the reference electrode. The fourth extending section is tightly connected to the bottom and middle portion of the reference plug, and seals against the portion of the reference plug bottom that protrudes horizontally beyond the middle portion of the reference plug.

[0020] As some specific examples, a protective edge portion is further provided at the bottom of the reference plug, and the protective edge portion is located on the outside of the fourth extension section of the sealing ring and is used to fix the sealing component.

[0021] The cover plate main body of the three-electrode battery top cover of the utility model further comprises a positive pole, a negative pole, a liquid injection hole, and an explosion-proof valve vent hole.

[0022] In a second aspect, the utility model provides a battery comprising a reference copper wire embedded in a diaphragm and a top cover of the three-electrode battery described in the first aspect; the reference copper wire is connected to a first positioning section of a reference electrode pin.

[0023] As some specific examples, the connection between the reference copper wire and the reference electrode pin is selected from one of soldering connection, crimping connection or ultrasonic welding.

[0024] As some specific examples, the reference copper wire diameter is selected from 4-8 microns.

[0025] As some specific examples, the reference copper wire has one of a tape protective layer, a coating protective layer or a plating protective layer.

[0026] The utility model adopts the method of pre-embedding the reference copper wire into the battery diaphragm. This method can effectively prevent the reference copper wire from moving, falling off or oxidizing during the use of the battery, ensuring that the reference copper wire is in full contact with the electrolyte inside the battery, thereby ensuring the long-term stability of the reference electrode and the test accuracy.

[0027] As some specific examples, the reference copper wire is embedded into the diaphragm through hot pressing and compounding using a hot pressing roller.

[0028] As some specific examples, the reference copper wire is provided with several groups of pre-embedded points at intervals in the diaphragm;

[0029] Furthermore, the separator includes alternating PP layers and PE layers; the thickness of the PE layer is selected from 8-15 microns, and the thickness of the PP layer is selected from 6-12 microns, wherein the thickness of the PP layer is greater than the thickness of the PE layer.

[0030] The features and beneficial effects of the present invention are as follows: First, the top cover of the three-electrode battery of the present invention adopts a modular design, which is convenient for assembly and maintenance; second, the stability of the battery during testing is improved by pre-embedded copper wires and a stable connection method; third, the method of pre-embedded copper wires inside the diaphragm of the present invention avoids the secondary oxidation of the copper wires and improves the accuracy of potential acquisition; and the pre-embedded design of the reference electrode of the present invention avoids the risk of damaging the cover plate in the traditional method, thereby improving the accuracy and safety of battery testing. Fourth, the top cover design of the three-electrode battery of the present invention, which fixes the reference pole jack and the reference pole pin with a ring-like elastic part and further fixes it with a tightening nut and a sealing ring, reduces the risk of external moisture and impurities intrusion, ensures the stability and sealing of the reference electrode, and thus improves the safety and reliability of battery testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the top cover of the three-electrode battery of the utility model

[0033] Figure 2 This is a side sectional view of the reference electrode pole of the utility model

[0034] Figure 3 This is a cross-sectional view of the side structure of the reference electrode column of the utility model.

[0035] Figure 4 This is a side cross-sectional view of the reference plug of the reference electrode of the utility model.

[0036] Figure 5 This is a schematic diagram of the structure of the internal structure of the reference copper wire embedded diaphragm of the utility model

[0037] Reference numerals:

[0038] Cover plate body 1, cover plate raised portion 11, positive electrode 12, negative electrode 13, injection hole 14, explosion-proof valve vent 15, upper insulating layer 2, cover contact angle 21, reference electrode 3, reference plug 31, reference plug top 311, reference plug middle 312, reference plug bottom 313, edge guard 3131, fastening nut 314, sealing ring 315, sealing ring third extension section 3151, sealing ring fourth extension section 3152, recess 316, reference electrode pin 32, first positioning section 321, first extension section 322, annular elastic member 33, lower insulating layer 4, lower insulating layer raised portion 41, reference copper wire 5, diaphragm 6, PP layer 62, PE layer 61, hot pressing roller 7. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below, and embodiments of the present invention are given, but the scope of the present invention is not limited thereby.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusions.

[0041] In a first aspect, the present invention provides a top cover for a three-electrode battery. Figure 1-4The top cover includes a cover body 1, which is used to provide a support component. The cover body 1 includes at least one cover protrusion 11 and at least one upper insulating layer 2. The cover protrusion 11 and the upper insulating layer 2 are interlocking in a concave-convex manner, which can better fix the battery while reducing the risk of internal short circuits. At least one reference electrode 3 is provided through the cover body 1 and the upper insulating layer 2. The reference electrode 3 is connected to the cover body 1 through the upper insulating layer 2 to prevent the reference electrode 3 from short-circuiting with other parts of the battery. This ensures the accuracy of the internal potential of the battery.

[0042] As some specific examples, Figure 2 As shown, the cover plate protrusion 11 and the upper insulating layer 2 are matched and engaged through a covering contact angle 21 , and the covering contact angle 21 is in a chamfered form, which plays a role in protecting the cover plate body 1 .

[0043] As some specific examples, Figure 1 、 Figure 2 As shown, a cover plate protrusion 11 and an upper insulating layer 2 are provided above the cover plate body 1, and two parallel reference poles 3 are provided above the upper insulating layer 2; wherein, the reference poles 3 have the same connection structure on the cover plate protrusion 11 and the upper insulating layer 2.

[0044] The top cover also includes a lower insulating layer 4, a positive electrode column 12, a negative electrode column 13, a liquid injection hole 14, and an explosion-proof valve vent 15. The lower insulating layer 4 includes at least one lower insulating layer protrusion 41 that interlocks with the cover plate protrusion 11 in a concave-convex manner, which serves to tightly connect the lower insulating layer 4 and the cover plate body 1 and isolate the battery components to prevent short circuits. The positive electrode column 12, negative electrode column 13, liquid injection hole 14, and explosion-proof valve vent 15 are arranged on the cover plate body 1.

[0045] As some specific examples, Figure 1 As shown, the positive electrode column 12 and the negative electrode column 13 are respectively located on both sides of the cover body 1, and the explosion-proof valve vent hole 15 and the liquid injection hole 14 are arranged in sequence above the cover body 1 and located between the positive electrode column 12 and the negative electrode column 13.

[0046] The reference pole 3 includes a reference plug 31, a reference pole pin 32, and an annular elastic member 33; the reference pole 31 and the reference pole pin 32 are connected by the annular elastic member 33 and are coaxially arranged in the vertical direction. The annular elastic member 33 is accommodated inside the reference pole 31 and embeds and fixes the reference pole pin 32 through elastic expansion.

[0047] In the design of the present invention, the annular elastic member 33 can easily insert the reference electrode pin 32 into the reference electrode 31 and fix it in the appropriate position through elastic expansion, without the need for additional fasteners or complicated assembly steps, ensuring that the reference electrode pin 32 will not loosen or shift during battery operation, maintaining the relative stability of the reference electrode pin 32. The elastic member also has slight elasticity, which is conducive to absorbing the tiny vibrations that may be generated by the reference electrode pin 32 during the battery charging and discharging process, thereby further ensuring the accuracy and stability of the test. In addition, its annular structure design can also effectively ensure that the structural stability of the reference electrode pin 32 is better protected when the battery is subjected to external impact or vibration, reducing the electrochemical corrosion of the reference electrode pin 32 caused by direct contact between metals, and avoiding test errors caused by poor contact.

[0048] As some specific examples, Figure 2 、 Figure 3 As shown, the present invention preferably uses a crown spring as the annular elastic member 33. The crown spring not only has excellent elasticity and stability, but also has good electrical conductivity. It can be used as part of the electrical connection to connect the reference electrode pin 32 with the reference electrode 31, thereby achieving electrical connectivity inside the battery. At the same time, the crown spring also has good corrosion resistance and wear resistance, ensuring stable performance even in harsh environments.

[0049] The reference electrode pin 32 is provided with a first positioning section 321 and a first extension section 322 at the bottom. The first positioning section 321 extends out from the bottom end face of the reference pin 31 to facilitate welding connection with the reference copper wire inside the embedded battery; the first extension section 322 is located inside the reference pin 31 and is concave-convexly engaged with the bottom of the reference pin 31; the reference electrode pin 32 is designed as an integrated molding, and the first extension section 322 further plays a role in fixing the reference electrode pin 32 to prevent loosening, displacement or impurities such as moisture from entering due to loose engagement with the reference pin 32 and the reference pin 31, thereby ensuring the stability and accuracy of the reference electrode pin 32 during battery operation.

[0050] The reference plug 31 passes through the lower insulating layer 4, the cover body 1, and the upper insulating layer 2; the reference plug 31 includes a reference plug top 311, a reference plug middle 312, and a reference plug bottom 313; Figure 2 、 Figure 3 、 Figure 4As shown, the reference plug top 311 extends beyond the upper insulating layer 2 and has an externally threaded structure. A removable fastening nut 314 is provided on the reference plug top 311 to secure the reference terminal pin 32 and ensure its stability during battery operation. The fastening nut 314, in conjunction with the externally threaded structure of the reference plug top 311, can be easily tightened or loosened, enabling precise adjustment and securing of the reference terminal pin 32 while facilitating disassembly and maintenance. Furthermore, the fastening nut 314 prevents external moisture and impurities from invading the battery interior through the reference plug 31, further enhancing the safety and reliability of battery testing. The reference plug bottom 313 has a recessed platform 316 that mates with the first extension section 322 of the reference terminal pin 32 in a concave-convex manner. The horizontal length of the reference plug bottom 313 protrudes beyond the reference plug middle portion 312, stabilizing the reference plug 31.

[0051] The reference plug 31 is also provided with a sealing ring 315 , and the reference plug 31 is connected to the cover body 1 via the sealing ring 315 , which plays a sealing role to prevent the electrodes from short-circuiting.

[0052] As some specific examples, Figure 2 、 Figure 3 、 Figure 4 As shown, the sealing ring 315 is further provided with a third extension 3151 and a fourth extension 3152. The third extension 3151 extends upward beyond the upper insulating layer 2, contacting the bottom surface of the fastening nut 314 and threadedly engaging the top of the reference electrode 3. This maintains the stability of the conductive seal, ensuring isolation between the battery interior and the external environment, and preventing the intrusion of moisture and impurities. The fourth extension 3152 is tightly connected to the bottom 313 and the middle portion 312 of the reference electrode, and seals the portion of the bottom 313 that protrudes horizontally beyond the middle portion 312 of the reference electrode.

[0053] As some specific examples, Figure 2 、 Figure 3 、 Figure 4 As shown, the bottom 313 of the reference plug is also provided with a protective edge portion 3131, which is located on the outside of the fourth extension section 3152 of the sealing ring and is used to fix the seal to prevent the reference electrode from short-circuiting due to loose sealing, thereby affecting the stability and accuracy of the potential test.

[0054] As some specific examples, Figure 1 As shown, the top cover is set to a square structure. The top cover of the utility model is designed to be a square structure, which makes the overall structure of the battery more stable and convenient for arrangement and fixation in the battery pack. The design of the square top cover also facilitates modular production and improves production efficiency and consistency.

[0055] First, the battery components on the top cover of the three-electrode battery of the present invention are designed and manufactured as independent modules; this not only improves production efficiency, but also provides convenience during battery testing and maintenance. Secondly, the top cover of the three-electrode battery of the present invention also uses components such as a sealing ring 315 and a fastening nut 314. These components work together to form a sealing system to prevent external moisture and impurities from entering the interior of the battery through the top cover; the sealing ring 315 is usually made of elastic material and can fill the gap between the top of the reference pole 3 and the fastening nut 314 to provide a good sealing effect. In addition, the present invention also provides additional protection for the reference pole 3 by using components such as an upper insulating layer 2, a lower insulating layer 4 and a ring-like elastic member 33 to prevent it from failing due to physical damage or chemical corrosion. These protective measures also help to maintain the cleanliness and dryness of the interior of the battery; greatly improving the safety and accuracy of battery testing.

[0056] In a second aspect, the present invention provides a battery comprising a reference copper wire 5 embedded in a diaphragm and a top cover of the three-electrode battery according to the first aspect; Figure 5 . The pre-buried reference copper wire 5 is arranged inside the diaphragm 6, thereby ensuring that the reference copper wire 5 is in full contact with the electrolyte inside the battery, while avoiding direct exposure of the reference copper wire 5 to the internal environment of the battery, reducing the risk of breakage. After the lamination of the diaphragm 6 is completed, the exposed part of the reference copper wire 5 exposed from the diaphragm 6 is protected by a protective layer, folded in half and blended, and connected to the first positioning section 321 of the reference electrode pin 32. Folding and blending the exposed part of the reference copper wire 5 is beneficial to increasing its mechanical strength and conductive stability.

[0057] As some specific examples, Figure 5 As shown, the reference copper wire 5 is arranged on the PE layer 61 of the diaphragm 6. The diaphragm 6 is composed of PP layers 62 and PE layers 61 alternately, which can provide the necessary mechanical strength and chemical stability and better protect the integrity of the reference copper wire 5.

[0058] As some specific examples, Figure 5 As shown, the reference copper wire 5 is pre-treated and then uniformly embedded in the diaphragm 6 by hot pressing and laminating using a hot pressing roller 7.

[0059] As some specific examples, Figure 5 As shown, the exposed reference copper wire 5 is connected to the reference electrode pin 32 by one or more methods selected from soldering, crimping, or ultrasonic welding. These methods ensure a good connection between the reference copper wire 5 and the reference electrode pin 32 while maintaining the stability and durability of the connection, thereby improving the stability and safety of the test.

[0060] As some specific examples, Figure 5 As shown, the diameter of the reference copper wire 5 is selected from 4-8 microns. The copper wire within this range has good flexibility and conductivity, and can effectively monitor the electrochemical reaction inside the battery without affecting the normal operation of the battery.

[0061] As some specific examples, Figure 5 As shown, the reference copper wire 5 is provided with several groups of pre-buried points at intervals in the diaphragm 6; the specific setting method is to select a suitable pre-buried point spacing according to the width and thickness of the battery cell, and each group of pre-buried points includes at least 4 pre-buried points; thereby achieving accurate monitoring of the electrochemical reaction inside the battery and ensuring that the copper wire will not break or shift during the battery stacking process.

[0062] In principle, the present invention does not limit the spacing distance and the number of pre-buried points, and those skilled in the art can make reasonable selections based on the thickness and width requirements of the battery cell.

[0063] As some specific examples, Figure 5 As shown, the portion of the reference copper wire 5 exposed from the diaphragm 6 is provided with a protective layer of either tape, coating, or plating. This improves the corrosion resistance and adhesion of the reference copper wire 5, preventing breakage during or after the pre-embedding process. This pretreatment ensures that the reference copper wire 5 maintains stable performance in the harsh environment of the battery, extending the battery's service life.

[0064] As some specific examples, Figure 5 As shown, the thickness of the PE layer 61 of the separator 6 is selected from 8-15 microns, and the thickness of the PP layer 62 of the separator 6 is selected from 6-12 microns, wherein the thickness of the PP layer 62 is greater than the thickness of the PE layer 61. This range of thicknesses for the PE and PP layers 62 ensures that the separator 6 has sufficient mechanical strength and chemical stability, while also ensuring good ion conductivity during the battery's charge and discharge processes. The greater thickness of the PP layer 62 than the PE layer 61 provides better mechanical support, preventing deformation or damage to the battery during prolonged use.

[0065] The following is a specific embodiment to illustrate the implementation of the present invention:

[0066] 1. First, prepare a separator 6 consisting of alternating PP layers 62 and PE layers 61. Ensure that the thickness of PE layer 61 is 8 microns and that of PP layer 62 is 9 microns. Using hot pressing rollers 7, evenly embed the reference copper wire 5 into the PE layer 61 of separator 6 using hot pressing and lamination technology. Set four pre-embedded points at regular intervals, with the exposed copper wire length ranging from 40 to 60 mm. Protect the exposed copper wire with tape.

[0067] 2. The diaphragm 6 is laminated. After the lamination is completed, the protective tape of the exposed reference copper wire 5 is torn off and the diaphragm 6 is folded and mixed several times.

[0068] 3. Preparation and Assembly of the Three-Electrode Battery Top Cover of the Utility Model First, the upper insulating layer 2 and the lower insulating layer 4 are installed at corresponding positions on the top cover and the battery housing, respectively.

[0069] 4. Then install the seal on the outside of the reference plug 31 to ensure that the sealing ring 315, the third extension section 3151 of the sealing ring 315, and the fourth extension section 3152 of the sealing ring 315 can all fit tightly on the reference plug 31; at the same time, the fastening nut 314 is tightened on the reference plug 31 to further tighten the seal to ensure the sealing performance of the entire top cover.

[0070] 5. Next, insert the reference electrode pin 32 into the reference pin 31 hole in the top cover, ensuring it fits snugly inside the top cover. Then, connect the folded and combined reference copper wire 5 to the reference electrode pin 32 using soldering.

[0071] 6. Finally, conduct an overall inspection and test to ensure that all components are correctly installed and pass the helium test. The contact between the reference copper wire 5 and the electrolyte is verified by the potential test, and whether the overall performance of the battery meets the design requirements.

[0072] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A top cover for a three-electrode battery, characterized in that: The top cover comprises at least one reference pole (3) penetrating the cover plate body (1); the reference pole (3) comprises a group of reference plugs (31) and reference pole pins (32) coaxially arranged in a vertical direction; the reference plugs (31) and the reference pole pins (32) are fixedly connected via a quasi-annular elastic member (33); wherein the quasi-annular elastic member (33) is used to be accommodated inside the reference plug (31) and to embed and fix the reference pole pins (32) through elastic expansion.

2. The top cover of the three-electrode battery according to claim 1, characterized in that: The annular elastic member (33) is a crown spring.

3. The top cover of the three-electrode battery according to claim 1, characterized in that: The cover plate body (1) further comprises an upper insulating layer (2) and a lower insulating layer (4); the reference pole (3) is arranged to penetrate the cover plate body (1), the upper insulating layer (2), and the lower insulating layer (4); Furthermore, the cover plate body (1) comprises at least one cover plate protrusion (11) and at least one upper insulating layer (2), and the cover plate protrusion (11) and the upper insulating layer (2) are in a concave-convex fit; Furthermore, the lower insulating layer (4) includes at least one lower insulating layer protrusion (41) that is engaged with the cover plate protrusion (11) in a concave-convex manner, thereby tightly connecting the lower insulating layer (4) and the cover plate body (1). Furthermore, the cover plate raised portion (11) and the upper insulating layer (2) are matched and engaged through a covering contact angle (21), and the covering contact angle (21) is in a chamfered form, which plays a role in protecting the cover plate body (1).

4. The top cover of the three-electrode battery according to claim 1, characterized in that: The top of the reference plug (31) has an external thread structure and is provided with a detachable fastening nut (314) for fixing the reference pole pin (32).

5. The top cover of the three-electrode battery according to claim 4, characterized in that: The reference pole plug pin (32) is provided with a first positioning section (321) and a first extension section (322) at the bottom, and the reference pole plug pin (32) is designed to be integrally formed; the reference plug pin (31) includes a reference plug pin top (311), a reference plug pin middle (312) and a reference plug pin bottom (313); the reference plug pin bottom (313) has a concave platform (316) which is in a concave-convex fit with the first extension section (322) of the reference pole plug pin (32); the first positioning section (321) is located below the first extension section (322) and extends out of the end face of the reference plug pin bottom (313); the reference plug pin top (311) is arranged beyond the cover plate body (1); the horizontal length of the reference plug pin bottom (313) protrudes beyond the reference plug pin middle (312).

6. The top cover of the three-electrode battery according to claim 5, characterized in that: The reference plug post (31) is also provided with a sealing ring (315) on the outside, and the reference plug post (31) is connected to the cover plate body (1) via the sealing ring (315); Furthermore, the sealing ring (315) is also provided with a third sealing ring extension section (3151) and a fourth sealing ring extension section (3152); the third sealing ring extension section (3151) extends upward beyond the cover plate body (1); the fourth sealing ring extension section (3152) is tightly connected to the bottom of the reference plug column (313) and the middle part of the reference plug column (312), and is sealed and fitted with the part of the horizontal length of the bottom of the reference plug column (313) that protrudes from the middle part of the reference plug column (312).

7. The top cover of the three-electrode battery according to claim 6, characterized in that: The bottom (313) of the reference plug is further provided with a side guard (3131), and the side guard (3131) is located outside the fourth extension section (3152) of the sealing ring and is used to fix the sealing member.

8. A battery, characterized in that: The battery comprises a reference copper wire (5) pre-buried in a diaphragm and a top cover of a three-electrode battery according to any one of claims 1 to 7; the reference copper wire (5) is connected to a reference electrode pin (32).

9. The battery according to claim 8, characterized in that The connection between the reference copper wire (5) and the reference electrode pin (32) is selected from one of soldering connection, crimping connection or ultrasonic welding; the reference copper wire (5) has one of a tape protective layer, a coating protective layer or a plating protective layer; Furthermore, the diameter of the reference copper wire (5) is selected from 4-8 microns.

10. The battery according to claim 8, characterized in that The reference copper wire (5) is provided with a plurality of pre-buried points at intervals in the diaphragm (6); the diaphragm (6) comprises a PP layer (62) and a PE layer (61) alternately formed; the thickness of the PE layer (61) is selected from 8 to 15 microns, and the thickness of the PP layer (62) is selected from 6 to 12 microns, wherein the thickness of the PP layer (62) is greater than the thickness of the PE layer (61).

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