Three-electrode battery structure and lithium battery

Abstract

The utility model provides a three-electrode battery structure and a lithium battery, the three-electrode battery structure comprises a reference assembly and a battery cell main body, the battery cell main body comprises a top sealing part, a positive electrode assembly and a negative electrode assembly, the positive electrode assembly and the negative electrode assembly are connected to one side of the battery cell main body, the battery cell main body is also provided with a battery cell accommodating groove, the top sealing part is provided with an electrode groove, and the electrode groove is communicated with the battery cell accommodating groove. The reference assembly is fixed in the electrode groove, and the positive electrode assembly and the negative electrode assembly are respectively connected in the cell accommodating groove, so that mutual interference among the reference assembly, the positive electrode assembly and the negative electrode assembly is avoided, and the reference assembly can accurately monitor potential changes of the positive electrode assembly and the negative electrode assembly. The electrode grooves are communicated with the battery cell accommodating groove, and the electrolyte in the electrode grooves can flow into the battery cell accommodating groove, so that the electrolyte in the battery cell main body is kept uniform and stable, the battery performance fluctuation caused by electrolyte change is reduced, and the stability of the three-electrode battery structure is further improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery preparation, and particularly to a three-electrode battery structure and a lithium battery. Background Art

[0002] With the global pursuit of clean energy and sustainable development, and the application of new energy electric vehicles, large-scale energy storage systems, and portable 3C digital products, as the core energy storage component, the performance and lifespan of lithium-ion batteries have become the key factors restricting the further development of these fields. However, during the long-term cyclic use of lithium-ion batteries, problems such as the decline in the structural stability of the positive electrode material and lithium plating on the negative electrode are faced. These failure mechanisms directly affect the safety, cycle life, and energy efficiency of the battery.

[0003] In order to deeply explore the cyclic failure mechanism of lithium-ion batteries and improve battery performance, researchers widely use a three-electrode test system. By introducing a reference electrode, the potential changes of the positive and negative electrodes during cycling can be monitored in real time, so as to accurately analyze the electrochemical reactions and structural evolution occurring inside the battery. In traditional three-electrode batteries, the reference electrode is set inside the battery structure, which easily causes interference between the reference electrode and the positive and negative electrodes, thus affecting the test accuracy during the cyclic test of the battery.

[0004] For example, the prior art CN201810436391.X discloses a lithium-ion three-electrode soft-pack battery, including: an aluminum-plastic film, an electric core, a reference electrode, an electrolyte, a positive electrode tab, and a negative electrode tab; one end of the reference electrode inserted into the electric core is wrapped with a lithium sheet, the positive electrode tab and the negative electrode tab are respectively welded to the positive and negative electrodes of the electric core, the aluminum-plastic film wraps the electric core and the reference electrode, and the reference electrode extends out of the aluminum-plastic film. During the test, the potentials of the positive and negative electrodes relative to the reference electrode obtained by a multi-channel voltage recorder can reflect the potential changes of the positive and negative electrodes during charge and discharge of the two-electrode soft-pack battery, thus serving as the standard for judging the lithium plating potential of the two-electrode soft-pack battery and playing an important role in designing the charging method. However, in this solution, the reference electrode is inserted between the positive and negative electrode plates inside the electric core. During the cyclic test of the battery, the reference electrode is prone to interference with the positive and negative electrode plates, resulting in deviation of the reference electrode potential signal, and further affecting the test accuracy during the cyclic test of the battery. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a three-electrode battery structure and a lithium battery that can effectively improve the accuracy of the battery cyclic test and avoid the direct insertion of the reference electrode into the electric core.

[0006] The purpose of the present disclosure is achieved by the following technical solutions:

[0007] A three - electrode battery structure includes a reference component and a battery cell body. The battery cell body includes a positive electrode component, a negative electrode component, and an aluminum - plastic shell. The positive electrode component and the negative electrode component are both connected to the aluminum - plastic shell. The aluminum - plastic shell is provided with a positive - electrode installation channel, a negative - electrode installation channel, and a battery - cell accommodation groove. The positive - electrode installation channel and the negative - electrode installation channel are both communicated with the battery - cell accommodation groove.

[0008] The aluminum - plastic shell has a top - sealing part. The top - sealing part, the positive electrode component, and the negative electrode component are all arranged on one side of the aluminum - plastic shell. The top - sealing part is provided with an electrode groove. One end of the reference component is arranged in the electrode groove, and the other end of the reference component is arranged outside the aluminum - plastic shell. The electrode groove is communicated with the battery - cell accommodation groove. An electrolyte is arranged in the electrode groove and the battery - cell accommodation groove.

[0009] In one embodiment, the reference component includes a reference - electrode sheet, a reference - electrode tab, an ear insulation seal, and a sheet diaphragm. The reference - electrode tab is welded to the reference - electrode sheet. The reference - electrode sheet is fixed in the electrode groove. The sheet diaphragm covers the reference - electrode sheet. The ear insulation seal is fixed to the edge of the top - sealing part and covers one end of the reference - electrode tab.

[0010] In one embodiment, the positive electrode component is adjacent to the reference component, and the reference component is located between the positive electrode component and the negative electrode component.

[0011] In one embodiment, the electrode groove is adapted to the outer - contour of the reference component.

[0012] In one embodiment, the aluminum - plastic shell further includes a bare battery cell and a shell. The shell is provided with the positive - electrode installation channel, the negative - electrode installation channel, and the battery - cell accommodation groove. The bare battery cell is arranged in the battery - cell accommodation groove. The shell covers the bare battery cell. One end of the positive electrode component is connected to the bare battery cell through the positive - electrode installation channel. One end of the negative electrode component is connected to the bare battery cell through the negative - electrode installation channel. The other ends of the positive electrode component and the negative electrode component are both arranged outside the shell.

[0013] In one embodiment, the bare battery cell is of a stacked - plate structure.

[0014] In one embodiment, the positive electrode component includes a positive - electrode current - collector and a positive - electrode tab. The positive - electrode current - collector passes through the positive - electrode installation channel. The positive - electrode current - collector is connected to the bare battery cell. The positive - electrode tab is connected to the positive - electrode current - collector.

[0015] In one embodiment, the negative electrode assembly includes a negative electrode current collector and a negative electrode tab. The negative electrode current collector is disposed through the negative electrode installation channel. The negative electrode current collector is connected to the bare battery cell, and the negative electrode tab is connected to the negative electrode current collector.

[0016] In one embodiment, the battery cell body further includes a positive electrode insulating seal and a negative electrode insulating seal. The positive electrode insulating seal is fixed to the edge of the top seal portion and covers one end of the positive electrode assembly. The negative electrode insulating seal is fixed to the edge of the top seal portion and covers one end of the negative electrode assembly.

[0017] A lithium battery includes the three-electrode battery structure described in any one of the above.

[0018] Compared with the prior art, the present disclosure has at least the following advantages:

[0019] 1. For the above three-electrode battery structure, during the battery cycle test, since the reference assembly is connected in the electrode groove, and the positive electrode assembly and the negative electrode assembly are respectively connected in the battery cell receiving groove, it is avoided that the reference assembly is directly inserted into the battery cell, thereby preventing interference between the reference assembly and the positive electrode assembly and the negative electrode assembly, reducing the test error of the reference electrode, and further enabling more accurate monitoring of the potential changes of the positive electrode assembly and the negative electrode assembly.

[0020] 2. Since the electrode groove communicates with the battery cell receiving groove, the electrode groove can also be used as a storage area for free electrolyte. During the battery cycle test, the electrolyte in the electrode groove can flow into the battery cell receiving groove, so that the electrolyte inside the battery cell body remains sufficient and evenly distributed, reducing the battery performance fluctuations caused by electrolyte changes, thereby improving the stability of the performance of the three-electrode battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a three-electrode battery structure of an embodiment;

[0023] Figure 2 For Figure 1 the schematic structural diagram of the reference assembly shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant accompanying drawings. Preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present disclosure more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] To better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail with specific embodiments as follows:

[0028] As Figure 1 shown, a battery structure 10 with three electrodes according to an embodiment of the present disclosure includes a reference component 100 and a battery cell main body 200. The battery cell main body 200 includes a positive electrode component 210, a negative electrode component 220 and an aluminum plastic shell 230. The positive electrode component 210 and the negative electrode component 220 are both connected to the aluminum plastic shell 230. The aluminum plastic shell 230 is provided with a positive electrode installation channel 2101, a negative electrode installation channel 2201 and a battery cell accommodation groove 2301. The positive electrode installation channel 2101 and the negative electrode installation channel 2201 are both communicated with the battery cell accommodation groove 2301. One end of the positive electrode component 210 passes through the positive electrode installation channel 2101, and one end of the negative electrode component 220 passes through the negative electrode installation channel 2201. The other ends of the positive electrode component 210 and the negative electrode component 220 are arranged outside the battery cell main body 200.

[0029] Furthermore, the aluminum-plastic shell 230 has a top-sealing portion 231. The top-sealing portion 231, the positive electrode assembly 210, and the negative electrode assembly 220 are all disposed on one side of the aluminum-plastic shell 230. The top-sealing portion 231 is provided with an electrode groove 2302. One end of the reference assembly 100 is disposed in the electrode groove 2302, and the other end of the reference assembly 100 is disposed outside the aluminum-plastic shell 230. The electrode groove 2302 communicates with the battery cell accommodating groove 2301. An electrolyte is provided in the electrode groove 2302 and the battery cell accommodating groove 2301. The top-sealing portion 231 isolates the electrode groove 2302 and the battery cell accommodating groove 2301 from the outside, preventing the electrolyte in the electrode groove 2302 and the battery cell accommodating groove 2301 from leaking.

[0030] In this embodiment, since the reference assembly 100 undergoes a cyclic reversible redox reaction with the electrolyte in the electrode groove, the potential of the reference assembly 100 remains constant during the cyclic test, thereby forming a stable and known potential reference point. During the cyclic test of the three-electrode battery structure 10, the reference assembly 100 is fixed in the electrode groove 2302, and the positive electrode assembly 210 and the negative electrode assembly 220 are respectively connected to the battery cell accommodating groove 2301 through the positive electrode installation channel 2101 and the negative electrode installation channel 2201, so that the positions of the reference assembly 100 relative to the positive electrode assembly 210 and the negative electrode assembly 220 are relatively stable. By measuring and comparing the potential differences between the reference assembly 100 and the positive electrode assembly 210, and between the reference assembly 100 and the negative electrode assembly 220, the potential changes of the positive electrode assembly 210 and the negative electrode assembly 220 during the cyclic test can be monitored in real time, and then the structural changes or failure mechanisms occurring inside the battery can be analyzed.

[0031] In the above three-electrode battery structure 10, during the battery cyclic test, since the reference assembly 100 is connected in the electrode groove 2302 and the positive electrode assembly 210 and the negative electrode assembly 220 are respectively connected in the battery cell accommodating groove 2301, the reference assembly 100 is prevented from being directly inserted into the battery cell, thereby preventing interference between the reference assembly 100 and the positive electrode assembly 210 and the negative electrode assembly 220, reducing the test error of the reference assembly 100, and further enabling more accurate monitoring of the potential changes of the positive electrode assembly 210 and the negative electrode assembly 220. Since the electrode groove 2302 communicates with the battery cell accommodating groove 2301, the electrode groove 2302 can also be used as a storage area for free electrolyte. During the battery cyclic test, the electrolyte in the electrode groove 2302 can flow into the battery cell accommodating groove 2301, ensuring that the electrolyte inside the battery cell accommodating groove 2301 is sufficient and evenly distributed, reducing the battery performance fluctuations caused by electrolyte changes, and thus improving the stability of the three-electrode battery performance.

[0032] Such as Figure 1 and Figure 2As shown, in one embodiment, the reference component 100 includes a reference electrode sheet 110, a reference tab 120, a tab insulation seal 130, and a sheet separator 140. The reference tab 120 is welded to the reference electrode sheet 110. The reference electrode sheet 110 is fixed within the electrode groove 2302. The sheet separator 140 wraps around the reference electrode sheet 110. The tab insulation seal 130 is fixed to the edge of the top seal portion 231 and wraps around one end of the reference tab 120. In this embodiment, since the reference electrode sheet 110 is fixed within the electrode groove 2302, one end of the reference tab 120 is welded to the reference electrode sheet 110, and the other end of the reference tab 120 is connected to the test terminal of an external measuring device, the potential signal of the reference electrode sheet 110 is conducted through the reference tab 120 to the external measuring device, facilitating the measurement of the reference electrode sheet 110 by the external measuring device, and thus ensuring the stability of the three - electrode battery structure 10 during the battery cycling test. The sheet separator 140 wraps around the reference electrode sheet 110, separating the reference electrode sheet 110 from the positive electrode assembly 210 and the negative electrode assembly 220, preventing interference between the positive electrode assembly 210 and the negative electrode assembly 220 and the reference component 100, and avoiding short - circuit caused by the internal contact between the reference component 100 and the aluminum - plastic shell 230, thereby ensuring the accuracy of the reference electrode during the measurement process. Since the tab insulation seal 130 has electrical insulation properties, it can prevent short - circuit contact between the reference tab 120 and the aluminum - plastic shell 230, thus improving the safety of the three - electrode battery structure 10.

[0033] As Figure 1 shown, in one embodiment, the positive electrode assembly 210 is adjacent to the reference component 100, and the reference component 100 is located between the positive electrode assembly 210 and the negative electrode assembly 220. In this embodiment, during the battery cycling test, since the reference component 100, the positive electrode assembly 210, and the negative electrode assembly 220 are arranged on one side of the aluminum - plastic shell 230, and the reference component 100 is arranged between the positive electrode assembly 210 and the negative electrode assembly 220, it simplifies the wire connection when the external test device tests the reference component 100, the positive electrode assembly 210, and the negative electrode assembly 220, avoiding interference between electrodes caused by complex wire connections, thereby improving the test efficiency of the three - electrode battery structure 10 during the battery cycling test.

[0034] As Figure 1 and Figure 2As shown, in one embodiment, the electrode groove 2302 is adapted to the outer contour of the reference assembly 100. In this embodiment, since the outer contour of the reference electrode sheet 110 is adapted to the electrode groove 2302, the reference electrode sheet 110 can be tightly fixed in the electrode groove 2302, avoiding the problem of the reference electrode sheet 110 shifting due to gaps in the electrode groove 2302, thereby reducing the measurement error caused by changes in the position of the reference assembly 100, and further improving the accuracy of the three-electrode battery structure 10 during the battery cycle test.

[0035] As Figure 1 shown, in one embodiment, the aluminum plastic shell 230 further includes a bare battery cell 232 and a shell 233. The shell 233 is provided with a positive electrode installation channel 2101, a negative electrode installation channel 2201, and a battery cell accommodation groove 2301. The bare battery cell 232 is disposed in the battery cell accommodation groove 2301, and the shell 233 covers the bare battery cell 232. One end of the positive electrode assembly 210 is connected to the bare battery cell 232 through the positive electrode installation channel 2101, and one end of the negative electrode assembly 220 is connected to the bare battery cell 232 through the negative electrode installation channel 2201. The other ends of the positive electrode assembly 210 and the negative electrode assembly 220 are both disposed outside the shell 233. In this embodiment, since the shell 233 is composed of a multi-layer composite structure, the bare battery cell 232 is disposed in the battery cell accommodation groove 2301 opened by the shell 233, and electrolyte is injected into the battery cell accommodation groove 2301, so that the bare battery cell 232 inside the aluminum plastic shell 230 is protected from the external environment, and the leakage of the electrolyte in the battery cell accommodation groove 2301 is prevented, thereby improving the stability of the three-electrode battery structure 10; since one end of the positive electrode assembly 210 and the negative electrode assembly 220 is connected to the bare battery cell 232, and the other ends of the positive electrode assembly 210 and the negative electrode assembly 220 connect the bare battery cell 232 to an external test device through the positive electrode installation channel 2101 and the negative electrode installation channel 2201 and form a current loop, the external measurement device can accurately measure the potential change in the bare battery cell 232.

[0036] As Figure 1 shown, in one embodiment, the bare battery cell 232 is a stacked structure. In this embodiment, the bare battery cell 232 includes a positive electrode sheet, a negative electrode sheet, and a positive and negative separator. The stacked bare battery cell 232 is formed by sequentially stacking and combining a plurality of thin positive electrode sheets, positive and negative separators, and negative electrode sheets. The electrolyte in the aluminum plastic shell 230 penetrates between the multiple stacks, providing an ion conduction channel for the electrode material, thereby realizing the storage and release of electrical energy; since the stacked structure is conducive to making more full use of the space inside the aluminum plastic shell 230, the aluminum plastic shell 230 can store more electrical energy under the same volume, thereby improving the energy density of the battery cell main body 200.

[0037] As Figure 1As shown, in one embodiment, the positive electrode assembly 210 includes a positive current collector 211 and a positive electrode tab 212. The positive current collector 211 is disposed through the positive electrode installation channel 2101. The positive current collector 211 is connected to the bare battery cell 232, and the positive electrode tab 212 is connected to the positive current collector 211. In this embodiment, since a plurality of positive electrode plates are provided in the bare battery cell 232, and the plurality of positive electrode plates are all connected to the positive current collector 211, and one end of the positive current collector 211 is connected to the positive electrode tab 212. When the other end of the positive electrode tab 212 is connected to an external measuring device, the potential signal of the positive electrode plate is conducted to the external measuring device through the positive electrode tab 212, which is beneficial to accurately monitoring the potential change of the positive electrode assembly 210 during the battery cycle test of the three-electrode battery structure 10.

[0038] As Figure 1 shown, in one embodiment, the negative electrode assembly 220 includes a negative current collector 221 and a negative electrode tab 222. The negative current collector 221 is disposed through the negative electrode installation channel 2201. The negative current collector 221 is connected to the bare battery cell 232, and the negative electrode tab 222 is connected to the negative current collector 221. In this embodiment, since a plurality of negative electrode plates are provided in the bare battery cell 232, and the plurality of negative electrode plates are all connected to the negative current collector 221, and one end of the negative current collector 221 is connected to the negative electrode tab 222. When the other end of the negative electrode tab 222 is connected to an external measuring device, the potential signal of the negative electrode plate is conducted to the external measuring device through the negative electrode tab 222, which is beneficial to accurately monitoring the potential change of the negative electrode assembly 220 during the battery cycle test of the three-electrode battery structure 10.

[0039] As Figure 1 shown, in one embodiment, the battery cell main body 200 further includes a positive electrode insulating seal 240 and a negative electrode insulating seal 250. The positive electrode insulating seal 240 is fixed to the edge of the top seal portion 231 and covers one end of the positive electrode assembly. The negative electrode insulating seal 250 is fixed to the edge of the top seal portion 231 and covers one end of the negative electrode assembly. In this embodiment, since the positive electrode insulating seal 240 and the negative electrode insulating seal 250 have electrical insulation properties, the positive electrode insulating seal 240 and the negative electrode insulating seal 250 can prevent the positive electrode tab 212 and the negative electrode tab 222 from coming into contact with the housing 233 and causing a short circuit, thereby improving the safety of the three-electrode battery structure 10.

[0040] A lithium battery includes a three - electrode battery structure as described in any one of the above. In this embodiment, the three - electrode battery structure 10 includes a reference component 100 and a battery cell main body 200. The battery cell main body 200 includes a positive electrode component 210, a negative electrode component 220, and an aluminum - plastic shell 230. The positive electrode component 210 and the negative electrode component 220 are both connected to the aluminum - plastic shell 230. The aluminum - plastic shell 230 is provided with a positive - electrode installation channel 2101, a negative - electrode installation channel 2201, and a battery cell accommodation groove 2301. The positive - electrode installation channel 2101 and the negative - electrode installation channel 2201 are both communicated with the battery cell accommodation groove 2301. One end of the positive electrode component 210 passes through the positive - electrode installation channel 2101, and one end of the negative electrode component 220 passes through the negative - electrode installation channel 2201. The other ends of the positive electrode component 210 and the negative electrode component 220 are arranged outside the battery cell main body 200. Further, the aluminum - plastic shell 230 has a top - sealing part 231. The top - sealing part 231, the positive electrode component 210, and the negative electrode component 220 are all arranged on one side of the aluminum - plastic shell 230. The top - sealing part 231 is provided with an electrode groove 2302. One end of the reference component 100 is arranged in the electrode groove 2302, and the other end of the reference component 100 is arranged outside the aluminum - plastic shell 230. The electrode groove 2302 is communicated with the battery cell accommodation groove 2301. An electrolyte is provided in the electrode groove 2302 and the battery cell accommodation groove 2301. The top - sealing part 231 isolates the electrode groove 2302 and the battery cell accommodation groove 2301 from the outside, avoiding the leakage of the electrolyte in the electrode groove 2302 and the battery cell accommodation groove 2301.

[0041] Compared with the prior art, the present disclosure has at least the following advantages:

[0042] 1. For the above - mentioned three - electrode battery structure 10, during the battery cycle test, since the reference component 100 is connected in the electrode groove 2302, and the positive electrode component 210 and the negative electrode component 220 are respectively connected in the battery cell accommodation groove 2301, it is avoided that the reference component 100 is directly inserted into the battery cell, thereby preventing interference between the reference component 100 and the positive electrode component 210 and the negative electrode component 220, reducing the test error of the reference component 100, and further enabling more accurate monitoring of the potential changes of the positive electrode component 210 and the negative electrode component 220.

[0043] 2. Since the electrode groove 2302 is communicated with the battery cell accommodation groove 2301, the electrode groove 2302 can also be used as a storage area for free electrolyte. During the battery cycle test, the electrolyte in the electrode groove 2302 can flow into the battery cell accommodation groove 2301, making the electrolyte inside the battery cell accommodation groove 2301 sufficient and evenly distributed, reducing the battery performance fluctuations caused by electrolyte changes, and thus improving the stability of the three - electrode battery performance.

[0044] The above-described embodiments merely represent several implementation manners of the present disclosure. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A three-electrode battery structure, comprising a reference assembly and a battery body, wherein the battery body comprises a positive electrode assembly, a negative electrode assembly and an aluminum-plastic shell, wherein the positive electrode assembly and the negative electrode assembly are both connected to the aluminum-plastic shell, and the aluminum-plastic shell is provided with a positive electrode installation channel, a negative electrode installation channel and a battery cell receiving groove, wherein the positive electrode installation channel and the negative electrode installation channel are both connected to the battery cell receiving groove, characterized in that: The aluminum-plastic shell has a top sealing part, and the top sealing part, the positive electrode assembly and the negative electrode assembly are all arranged on one side of the aluminum-plastic shell. The top sealing part is provided with an electrode groove, one end of the reference assembly is arranged in the electrode groove, and the other end of the reference assembly is arranged outside the aluminum-plastic shell, the electrode groove is connected to the battery cell accommodating groove, and electrolyte is arranged in the electrode groove and the battery cell accommodating groove.

2. The three-electrode battery structure according to claim 1, characterized in that: The reference assembly includes a reference electrode sheet, a reference electrode tab, an electrode tab insulating seal and an electrode sheet diaphragm. The reference electrode tab is welded to the reference electrode sheet, the reference electrode sheet is fixed in the electrode groove, the electrode sheet diaphragm is coated on the reference electrode sheet, and the electrode tab insulating seal is fixed to the edge of the top seal portion and coated on one end of the reference electrode tab.

3. The three-electrode battery structure according to claim 1, characterized in that: The positive electrode component is adjacent to the reference component, and the reference component is located between the positive electrode component and the negative electrode component.

4. The three-electrode battery structure according to claim 1, characterized in that: The electrode groove is adapted to the outer contour of the reference component.

5. The three-electrode battery structure according to claim 1, characterized in that: The aluminum-plastic shell also includes a bare battery cell and a shell, the shell is provided with the positive electrode mounting channel, the negative electrode mounting channel and the battery cell accommodating groove, the bare battery cell is arranged in the battery cell accommodating groove, the shell covers the bare battery cell, one end of the positive electrode assembly is connected to the bare battery cell through the positive electrode mounting channel, one end of the negative electrode assembly is connected to the bare battery cell through the negative electrode mounting channel, and the other ends of the positive electrode assembly and the negative electrode assembly are both arranged outside the shell.

6. The three-electrode battery structure according to claim 5, characterized in that: The bare battery core is a laminated structure.

7. The three-electrode battery structure according to claim 6, characterized in that: The positive electrode assembly includes a positive electrode current collector and a positive electrode tab. The positive electrode current collector is inserted into the positive electrode installation channel, the positive electrode current collector is connected to the bare battery cell, and the positive electrode tab is connected to the positive electrode current collector.

8. The three-electrode battery structure according to claim 6, characterized in that: The negative electrode assembly includes a negative electrode current collector and a negative electrode tab. The negative electrode current collector is inserted into the negative electrode installation channel, the negative electrode current collector is connected to the bare battery cell, and the negative electrode tab is connected to the negative electrode current collector.

9. The three-electrode battery structure according to claim 1, characterized in that: The battery cell body also includes a positive electrode insulating seal and a negative electrode insulating seal. The positive electrode insulating seal is fixed to the edge of the top seal and covers one end of the positive electrode assembly. The negative electrode insulating seal is fixed to the edge of the top seal and covers one end of the negative electrode assembly.

10. A lithium battery, characterized in that: A battery structure comprising three electrodes as claimed in any one of claims 1 to 9.

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