Lithium battery structure capable of supplementing lithium

Abstract

The application provides a lithium battery structure capable of supplementing lithium, and relates to the technical field of lithium batteries.The lithium battery structure comprises a battery sealing cover plate, a negative electrode adapter plate is arranged on the battery sealing cover plate, a functional device is arranged on the negative electrode adapter plate, the functional device comprises a tab and a contact piece connected with a lithium supplementing part, the tab is arranged to be bent away from the negative electrode adapter plate, the contact piece is an elastic member, the contact piece is bent to be in contact with the tab under the internal gas pressure of the lithium battery, and the lithium supplementing part supplements lithium for the negative electrode adapter plate.The functional device is arranged on the negative electrode adapter plate, the contact piece is bent to be connected with the tab by using the gas generated by the side reaction in the lithium battery, the lithium supplementing part is connected to supplement lithium for the negative electrode, the problem of low cycle life of the battery caused by the lack of lithium ions is effectively improved, lithium salt does not need to be added, and there is no risk of bringing in impurities, when the functional device is not in contact, the lithium supplementing part is in an independent state and does not participate in charging and discharging, and the phenomenon of lithium precipitation caused by the high lithium ion concentration of the lithium battery does not occur.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular, the present application relates to a lithium battery structure capable of supplementing lithium. BACKGROUND

[0002] With the development of lithium ion battery technology, high safety, high energy density and long cycle life of lithium battery have become the focus of the industry, among which long cycle life in different application scenarios has become the main factor limiting the degree of lithium battery cost.

[0003] Lithium ion batteries inject electrolyte during assembly, and the source of lithium ions comes from two aspects: lithium cathode material and electrolyte. However, lithium battery needs to generate SEI film (solid electrolyte interface film) on the surface of negative electrode material during activation, thereby consuming lithium ions in lithium battery, and SEI film will continue to thicken with the increase of charge and discharge times, that is, lithium ions in lithium battery are consumed, and the amount of lithium ions directly represents the capacity of lithium battery, so with the consumption of lithium ions, the cycle life of lithium battery is reduced.

[0004] The current way of supplementing lithium in lithium battery is to supplement lithium salt in the positive electrode and lithium metal in the negative electrode.

[0005] Among them, the method for supplementing lithium salt in the positive electrode is disclosed in Chinese patent invention patent CN111769288A, which belongs to the technical field of lithium ion batteries, and the specific scheme includes the following steps: step one: add lithium salt and iron salt to glucose solution or dopamine solution, stir uniformly to obtain a mixed solution, wherein the molar ratio of lithium to iron is 5:1-6:1; step two: immerse the lithium ion battery cathode material in the mixed solution prepared in step one, and centrifuge and dry after taking out; step three: put the centrifuged and dried material obtained in step two into the oven cavity, heat to 300-500℃ at a speed of 2-5℃ / min, pre-burn for 1-3h, then add to 800-900℃ at a speed of 2-5℃ / min, sinter for 12-24h, and then naturally cool to room temperature to obtain in-situ lithium-supplemented positive electrode material coated with carbon and Li5FeO4. The preparation method of the above-mentioned application is simple, low in cost, can effectively reduce the interface resistance, and improve the first coulomb efficiency and cycle performance of lithium battery;

[0006] The way of supplementing lithium metal to the negative electrode is provided in Chinese patent invention patent CN116053708A, which provides a lithium supplementing composite diaphragm for a lithium battery, a lithium battery and a preparation method thereof. The lithium battery comprises a negative electrode layer and a positive electrode layer. The lithium supplementing composite diaphragm is arranged between the negative electrode layer and the positive electrode layer. The lithium supplementing composite diaphragm comprises: a diaphragm layer configured to isolate the negative electrode layer and the positive electrode layer; a metal lithium layer arranged on a side of the diaphragm layer close to the negative electrode layer and configured to supplement lithium to the negative electrode layer; a first protective layer arranged on a side of the metal lithium layer close to the negative electrode layer; and an electron conductive layer arranged on a side of the metal lithium layer close to the negative electrode layer and configured to provide an electron conductive channel between the metal lithium layer and the negative electrode layer. The electron conductive layer and the first protective layer do not overlap or partially overlap in the orthographic projection of the metal lithium layer.

[0007] However, the above-mentioned lithium supplementing method still has the following disadvantages: the addition of lithium salt to the positive electrode will reduce the conductivity of the positive electrode material and will most likely introduce impurities, affecting the performance of the lithium battery; and the negative electrode supplementing lithium is currently mainly achieved by coating or spraying lithium metal on the negative electrode foil, but the attachment of lithium metal on the negative electrode foil will affect the adhesion of the material coated on the negative electrode.

[0008] Therefore, it is necessary for us to design a reasonable and efficient lithium supplementing lithium battery structure to solve the above-mentioned problems. SUMMARY

[0009] The present application aims to provide a lithium supplementing lithium battery structure, which has a simple structure. By arranging a functional device on the negative electrode adapter piece, the functional device is contacted and connected by the gas generated by the internal side reaction of the lithium battery, so as to access the lithium supplementing part for negative electrode lithium supplementing. The problem of low battery cycle life caused by the lack of lithium ions is effectively improved. No lithium salt is added, and there is no risk of introducing impurities. When the functional device is not in contact, the lithium supplementing part is in an independent state and does not participate in charging and discharging, so as to avoid the phenomenon of lithium precipitation caused by the high concentration of lithium ions in the lithium battery. In addition, the additional lithium-attached negative electrode current collector is used as the lithium supplementing part instead of directly coating the negative electrode material after the current collector is attached with lithium, which effectively avoids the problem of powdering of the negative electrode material and large resistance in the later stage of lithium supplementing.

[0010] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0011] The application discloses a lithium battery structure capable of supplementing lithium, which comprises a battery sealing cover plate, a negative electrode adapter plate arranged on the battery sealing cover plate, and a functional device arranged on the negative electrode adapter plate.

[0012] As a preferred embodiment of the application, the lithium supplementing part is a battery roll core, the battery roll core comprises a lithium-attached negative electrode current collector and a pole piece arranged outside the lithium-attached negative electrode current collector, the lithium-attached negative electrode current collector comprises a negative electrode current collector plate and a lithium metal layer arranged outside the negative electrode current collector plate; the pole piece is provided with a positive electrode lug for being connected with a positive electrode adapter plate on the battery sealing cover plate and a negative electrode lug for being connected with the negative electrode adapter plate, and the lithium-attached negative electrode current collector is provided with a third pole lug for being connected with the contact lug.

[0013] As a preferred embodiment of the application, the functional device comprises a base and a mounting ring arranged on a side of the base away from the negative electrode adapter plate, a fixing ring is arranged on a side of the base close to the mounting ring, the lug is arranged inside the fixing ring, and the contact lug is arranged at an end of the mounting ring away from the fixing ring; the fixing ring and the mounting ring are threadedly connected.

[0014] As a preferred embodiment of the application, the lug is a metal lug, and the contact lug is a metal contact lug.

[0015] As a preferred embodiment of the application, the base and the fixing ring are metal pieces, and the mounting ring is a plastic piece.

[0016] As a preferred embodiment of the application, an outer thread is arranged on an outer side of the fixing ring, and an inner thread for cooperating with the outer thread is arranged on an inner side of the mounting ring.

[0017] As a preferred embodiment of the application, lithium metal layers are arranged on both sides of the negative electrode current collector plate.

[0018] As a preferred embodiment of the application, an explosion-proof valve is arranged on the battery sealing cover plate between the positive electrode adapter plate and the negative electrode adapter plate.

[0019] As a preferred embodiment of the application, the number of the battery roll cores is two, and the two battery roll cores are arranged on both sides of the battery sealing cover plate.

[0020] As a preferred embodiment of the application, the functional device is arranged on an end of the negative electrode adapter plate close to the positive electrode adapter plate, and the third pole lug is arranged on a side of the negative electrode lug close to the positive electrode lug.

[0021] As a preferred embodiment of the present application, a sealing gasket is arranged on the side of the fixing ring close to the mounting ring.

[0022] As a preferred embodiment of the present application, the pole piece includes a positive pole piece and a negative pole piece, the positive pole lug is arranged on the positive pole piece, the negative pole lug is arranged on the negative pole piece, and the number of the positive pole piece and the negative pole piece is at least one.

[0023] The lithium battery structure capable of supplementing lithium has the following advantages:

[0024] 1. Simple structure and convenient installation;

[0025] 2. By arranging the functional device on the negative pole adapter piece, the contact piece and the protruding piece of the functional device are connected by using the gas generated by the internal side reaction of the lithium battery, so that the lithium supplementing part of the contact piece supplements lithium to the negative pole of the lithium battery, effectively improves the problem of low cycle life of the battery caused by the lack of lithium ions, and does not need to add lithium salt and does not have the risk of bringing in impurities;

[0026] 3. When the functional device is not in contact, the lithium supplementing part is in an independent state and does not participate in charging and discharging, so as not to cause the lithium battery to have too high lithium ion concentration and cause lithium precipitation;

[0027] 4. By using the battery roll core structure as the lithium supplementing part and additionally adding the lithium supplementing negative pole current collector in the battery roll core instead of directly coating the negative pole material after supplementing lithium to the current collector, the problems of powdering of the negative pole material and large resistance in the later stage of lithium supplementing are effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 FIG. 1 is a structural schematic diagram of the overall structure of an embodiment of the lithium battery structure capable of supplementing lithium according to the present application;

[0029] Figure 2 FIG. 3 is a structural schematic diagram of a battery sealing cover plate in an embodiment of the lithium battery structure capable of supplementing lithium according to the present application;

[0030] Figure 3 FIG. 5 is a structural schematic diagram of a battery roll core in an embodiment of the lithium battery structure capable of supplementing lithium according to the present application;

[0031] Figure 4 FIG. 7 is a structural schematic diagram of a functional device in an embodiment of the lithium battery structure capable of supplementing lithium according to the present application;

[0032] Figure 5 FIG. 9 is a disassembled structural schematic diagram of the functional device in an embodiment of the lithium battery structure capable of supplementing lithium according to the present application;

[0033] Figure 6Structure diagram of the contact between the contact sheet of the functional device and the tab in one embodiment of the lithium battery structure of the present application;

[0034] Figure 7 Structure diagram of the cross section of the lithium-attached negative electrode current collector in one embodiment of the lithium battery structure of the present application;

[0035] In the figure: 1, battery sealing cover plate, 11, positive electrode adapter tab, 12, negative electrode adapter tab, 13, explosion-proof valve, 2, functional device, 21, base, 211, fixing ring, 212, tab, 213, external thread, 22, mounting ring, 221, contact sheet, 222, internal thread, 3, battery roll core, 31, lithium-attached negative electrode current collector, 311, negative electrode current collector plate, 312, lithium metal layer, 313, third pole lug, 32, pole piece, 321, positive electrode lug, 322, negative electrode lug. DETAILED DESCRIPTION

[0036] The following is a specific embodiment of the present application, which further describes the technical solutions of the present application, but the present application is not limited to these embodiments.

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement and the steps of the modules and steps described in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0038] Meanwhile, it should be understood that, for the convenience of description, the processes in the drawings are not performed separately, but multiple steps are performed in mutual intersection.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the present application and its applications or uses.

[0041] Techniques, methods, and systems known to those of ordinary skill in the relevant art can not be discussed in detail, but where appropriate, the techniques, methods, and systems should be considered as part of the specification.

[0042] Embodiment one: as Figure 2 , 4 , 5, 6, only one of the embodiments of the application, a lithium battery structure that can supplement lithium, including a battery sealing cover plate 1, the battery sealing cover plate 1 is provided with a negative pole adapter piece 12, the negative pole adapter piece 12 is provided with a functional device 2, the functional device 2 includes a tab 212 in communication with the negative pole adapter piece 12 and a contact piece 221 connected with a lithium supplement part, the contact piece 221 is arranged on the side of the tab 212 away from the negative pole adapter piece 12, the tab 212 is arranged to bend away from the negative pole adapter piece 12, that is, the tab 212 is arranged to bend towards the contact piece 221, the contact piece 221 is a resilient member, so that the contact piece 221 bends to contact the tab 212 under the internal pressure of the lithium battery, and the lithium supplement part is in communication with the negative pole adapter piece 12 for lithium supplement.

[0043] In the present application, the battery sealing cover plate 1 of the lithium battery structure is designed, since the positive pole lithium supplement salt will bring in impurities, in order to avoid the influence of the lithium battery performance caused by the impurities, the negative pole lithium supplement is designed, the functional device 2 for lithium supplement is arranged at the negative pole adapter piece 12 of the battery sealing cover plate 1, and the negative pole lithium supplement is carried out during the working process of the lithium battery, so as to effectively improve the problem of low battery cycle life caused by the lack of lithium ions.

[0044] Here, the functional device 2 includes a base 21 and a mounting ring 22 arranged on the side of the base 21 away from the negative pole adapter piece 12, the side of the base 21 close to the mounting ring 22 is provided with a fixed ring 211, the tab 212 is arranged inside the fixed ring 211, and the contact piece 221 is arranged at one end of the mounting ring 22 away from the fixed ring 211; the fixed ring 211 and the mounting ring 22 are threadedly connected; the functional device 2 is installed and arranged inside the battery sealing cover plate 1, that is, the functional device 2 is located inside the lithium battery.

[0045] Among them, the base 21 is welded on the negative pole adapter piece 12, the base 21 is provided with a fixed ring 211 extending away from the negative pole adapter piece 12, the inside of the fixed ring 211 is provided with a tab 212 connected with the base 21, and the tab 212 is arc-shaped and curved protruding away from the negative pole adapter piece 12.

[0046] And, the mounting ring 22 is separately arranged, the mounting ring 22 is arranged on the side of the base 21 away from the negative pole adapter piece 12, the side of the mounting ring 22 close to the base 21 is threadedly connected with the fixed ring 211, and the contact piece 22 is arranged at one end of the mounting ring 22 away from the base 21; the contact piece 22 is sealingly arranged at one end of the mounting ring 22 away from the base 21, and the lithium metal member is arranged in the lithium supplement part connected with the contact piece 221.

[0047] When the mounting ring 22 is screwed onto the fixing ring 211, the contact piece 22 is in a flat state, and the space on the side of the contact piece 22 close to the negative electrode adapter piece 12 is sealed and does not communicate with other spaces inside the battery.

[0048] During the charging and discharging cycle of the lithium battery, a side reaction occurs, which produces gas and causes the internal pressure of the lithium battery to rise. In addition, the contact piece 221 is an elastic member with a certain elastic capacity. Therefore, when the internal pressure of the lithium battery decreases, the contact piece 221 will bend towards the tab 212 until the contact piece 221 contacts the tab 212, so that the lithium metal member connected by the contact piece 221 is connected to the negative electrode adapter piece 12 (as shown in Figure 6 During the charging and discharging process, the lithium metal is released into lithium ions, and the lithium supplement is completed.

[0049] The mechanism of lithium supplement is that lithium single element / lithium metal does not react with the electrolyte inside the lithium battery. Therefore, before the contact piece 221 contacts the tab 212, the lithium metal member is an independent structure. When the contact piece 221 contacts the tab 212 due to the internal pressure of the lithium battery, the lithium metal member begins to participate in the charging and discharging cycle of the lithium battery, and the lithium supplement occurs in the discharging stage:

[0050] During discharging: Li - e- → Li+

[0051] The electron e- is transferred to the positive electrode through the external circuit, and the Li+ is transferred to the positive electrode through the diaphragm and embedded into the Li+ vacancy of the positive electrode material.

[0052] In order to facilitate lithium supplement, the negative electrode adapter piece 12 needs to be lengthened first, so that the functional device 2 can be installed at the lengthened area of the negative electrode adapter piece 12.

[0053] In addition, the tab 212 is a metal tab, the contact piece 221 is a metal contact piece, the base 21 and the fixing ring 211 are metal members, and the mounting ring 22 is a plastic member. Before the contact piece 221 contacts the tab 212, the lithium metal member is independently arranged under the isolation of the plastic mounting ring 22. After the contact piece 221 contacts the tab 212, the lithium metal member is connected to the negative electrode adapter piece 12 through the contact piece 221, the tab 212, the fixing ring 211, and the base 21 in turn, and the contact piece 221, the tab 212, the fixing ring 211, and the base 21 are all metal members, which facilitates the electrical connection between the lithium metal member and the negative electrode adapter piece 12, and the charging and discharging cycle and lithium supplement.

[0054] Example two: as Figure 1 , 3, 7, only one embodiment of the present application, on the basis of example one, the present application can supplement lithium lithium battery structure, further comprising a battery winding core 3, the battery winding core 3 includes lithium negative electrode current collector 31 and the polar piece 32 arranged outside the lithium negative electrode current collector 31, the lithium negative electrode current collector 31 includes negative electrode current collector plate 311 and lithium metal layer 312 arranged outside the negative electrode current collector plate 311;The polar piece 32 is provided with positive electrode lug 321 for connecting with the positive electrode lug 321 on the battery sealing cover plate 1 and negative electrode lug 322 for connecting with the negative electrode lug 322, the lithium negative electrode current collector 31 is provided with third lug 313 for connecting with the contact piece 221.

[0055] In the present application, the battery winding core 3 structure is further optimized, here, by coating, spraying, electroplating and other means on the surface of the negative electrode current collector 311, the lithium metal layer 312 is formed, the lithium negative electrode current collector plate 31 is made, a section of lithium negative electrode current collector plate 31 is arranged in the winding core, and the lithium negative electrode current collector plate 31 is integrated with the winding core by hot pressing.

[0056] The main structure of the winding core is the polar piece 32, the polar piece 32 includes positive electrode sheet and negative electrode sheet, the positive electrode lug 321 is arranged on the positive electrode sheet, the negative electrode lug 322 is arranged on the negative electrode sheet, the number of positive electrode sheet and negative electrode sheet is at least one, the positive electrode sheet and negative electrode sheet are arranged around the winding layer, and the separator is arranged between the positive electrode sheet and negative electrode sheet to prevent positive and negative short circuit, the positive electrode lug 321 is only connected with the positive electrode sheet, and the negative electrode lug is only connected with the negative electrode sheet.

[0057] The lithium negative electrode current collector plate 31 is integrated with the winding core to form the battery winding core 3, which is used for connecting with the battery sealing cover plate 1, actually, the positive electrode lug 321 is connected with the positive electrode lug 11 on the battery sealing cover plate 1, and the negative electrode lug 322 is connected with the negative electrode lug 12 on the battery sealing cover plate 1;In addition, the third lug 313 is arranged on the lithium negative electrode current collector 31, which is used for connecting with the contact piece 221 on the functional device 2.

[0058] Of course, the third lug 313 is connected with the edge of the contact piece 221, the center of the contact piece 221 will bend to the negative electrode lug 12 direction under the internal secondary reaction gas pressure of the lithium battery, once the contact piece 221 contacts with the tab 212, then the lithium negative electrode current collector plate 31 is communicated with the negative electrode lug 12, and the lithium is supplemented to the negative electrode lug 12.

[0059] Here, by additionally increasing the lithium negative electrode current collector plate, instead of directly coating the negative electrode material after the current collector is lithiumized, the problem of negative electrode material powder falling and large resistance after lithium supplementing is well avoided.

[0060] Of course, the negative current collector plate 311 is provided with a lithium metal layer 312 on both sides, the lithium supplement method is negative lithium metal lithium supplement, and the lithium supplement negative current collector plate 31 is in an independent state when not connected and does not participate in charging and discharging, that is, lithium precipitation phenomenon caused by too high lithium ion concentration in the lithium battery will not occur.

[0061] Embodiment three: as shown, only one embodiment of the present application, on the basis of any of the above embodiments, in a lithium battery structure capable of supplementing lithium, the number of battery roll cores 3 is two, and the two battery roll cores 3 are arranged on both sides of the battery sealing cover plate 1, effectively utilizing the space on both sides of the battery sealing cover plate 1, effectively supplementing lithium for the lithium battery, and effectively improving the problem of low cycle life caused by the lack of lithium ions. Figures 1 to 7

[0062] In addition, the fixing ring 211 is threadedly connected with the mounting ring 22, in order to better install the mounting ring 22, it is better to threadedly connect the mounting ring 22 to the outside of the fixing ring 211, that is, the outside of the fixing ring 211 is provided with external threads 213, and the inside of the mounting ring 22 is provided with internal threads 222 for cooperating with the external threads 213, and the mounting ring 22 is threadedly installed on the outside of the fixing ring 211, which is convenient for installation of the mounting ring 22.

[0063] In the present application, the battery sealing cover plate 1 is provided with an explosion-proof valve 13 between the positive adapter piece 11 and the negative adapter piece 12, which can properly release gas when the amount of gas generated by the internal side reaction of the lithium battery is too large, thereby playing a certain explosion-proof safety role.

[0064] In the present application, the functional device 2 is arranged on one end of the negative adapter piece 12 close to the positive adapter piece 11; and the third tab 313 is arranged on one side of the negative tab 322 close to the positive tab 321, so that the relatively thin third tab 313 is located in the area between the negative tab 322 and the positive tab 321, which is not easy to damage or bend, and the lithium supplement effect is more guaranteed.

[0065] Finally, the fixing ring 211 is provided with a sealing washer on one side close to the mounting ring 22, although the plastic mounting ring 22 and the fixing ring 211 can realize a certain sealing in addition to the insulation function of the plastic part when they are connected, in order to ensure better sealing effect, it is better to add a layer of sealing washer at the connection between the fixing ring 211 and the mounting ring 22, to further ensure the sealing effect of the space on one side of the contact piece 221 close to the negative adapter piece 12.

[0066] ​The lithium battery structure capable of supplementing lithium has simple structure, the functional device is arranged on the negative electrode adapter piece, the gas generated by the internal side reaction of the lithium battery is used to make the functional device contact connection, so that the lithium supplementing part is connected to supplement the lithium of the negative electrode, the problem of low cycle life of the battery caused by the lack of lithium ions is effectively improved, lithium salt does not need to be added, there is no risk of bringing impurities, when the functional device is not in contact, the lithium supplementing part is in an independent state and does not participate in charging and discharging, so that the phenomenon of lithium precipitation caused by the high lithium ion concentration of the lithium battery does not occur, and the additional lithium negative electrode current collector is additionally increased as the lithium supplementing part, instead of directly coating the negative electrode material after the current collector is supplemented with lithium, so that the problems of powdering of the negative electrode material and large resistance in the later stage of lithium supplementing are effectively avoided.

[0067] The present application is not limited to the above-described specific embodiments, and various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made to the above embodiments in accordance with the technical essence of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium battery structure capable of lithium supplement, characterized in that: The application relates to a battery sealing cover plate (1) provided with a negative electrode adapter piece (12), wherein a functional device (2) is arranged on the negative electrode adapter piece (12), the functional device (2) comprises a tab (212) in conduction with the negative electrode adapter piece (12) and a contact piece (221) connected with a lithium supplement part, the tab (212) is arranged to bend towards the contact piece (221), the contact piece (221) is an elastic piece, so that the contact piece (221) is bent to be in contact with the tab (212) under the internal gas pressure of a lithium battery, the lithium supplement part is in conduction with the negative electrode adapter piece (12) to supplement lithium.

2. The lithium battery structure capable of supplementing lithium according to claim 1, wherein: The lithium supplement part is a battery roll core (3), the battery roll core (3) comprises an attached lithium negative electrode current collector (31) and a pole piece (32) arranged on the outer side of the attached lithium negative electrode current collector (31), the attached lithium negative electrode current collector (31) comprises a negative electrode current collector plate (311) and a lithium metal layer (312) arranged on the outer side of the negative electrode current collector plate (311); the pole piece (32) is provided with a positive electrode lug (321) for connecting with a positive electrode adapter piece (11) on the battery sealing cover plate (1) and a negative electrode lug (322) for connecting with the negative electrode adapter piece (12), and the attached lithium negative electrode current collector (31) is provided with a third pole lug (313) for connecting with the contact piece (221).

3. The lithium battery structure capable of supplementing lithium according to claim 1, wherein: The functional device (2) comprises a base (21) and a mounting ring (22) arranged on the side of the base (21) away from the negative electrode adapter piece (12), a fixing ring (211) is arranged on the side of the base (21) close to the mounting ring (22), the tab (212) is arranged on the inner side of the fixing ring (211), and the contact piece (221) is arranged on the end of the mounting ring (22) away from the fixing ring (211); the fixing ring (211) and the mounting ring (22) are in threaded connection.

4. The lithium battery structure capable of supplementing lithium according to claim 1, wherein: The tab (212) is a metal tab, and the contact piece (221) is a metal contact piece.

5. The lithium battery structure capable of supplementing lithium according to claim 3, characterized in that: The base (21) and the fixing ring (211) are metal pieces, and the mounting ring (22) is a plastic piece.

6. The lithium battery structure capable of supplementing lithium according to claim 2, wherein: Lithium metal layers (312) are arranged on the two sides of the negative electrode current collector plate (311).

7. The lithium battery structure capable of supplementing lithium according to claim 2, characterized in that: An explosion-proof valve (13) is arranged on the battery sealing cover plate (1) between the positive electrode adapter piece (11) and the negative electrode adapter piece (12).

8. The lithium battery structure capable of supplementing lithium according to claim 2, wherein: The number of the battery roll cores (3) is two, and the two battery roll cores (3) are arranged on the two sides of the battery sealing cover plate (1) respectively.

9. The lithium battery structure capable of supplementing lithium according to claim 2, characterized in that: The functional device (2) is arranged on the end of the negative electrode adapter piece (12) close to the positive electrode adapter piece (11); and the third pole lug (313) is arranged on the side of the negative electrode lug (322) close to the positive electrode lug (321).

10. The lithium battery structure capable of supplementing lithium according to claim 3, characterized in that: A sealing washer is arranged on the side of the fixing ring (211) close to the mounting ring (22).

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