CN219419144U - Solid-state battery and negative electrode lithium supplementing system - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a solid-state battery and a negative electrode lithium supplementing system. The solid-state battery includes an electrode assembly including: the positive plate is connected with the positive lug; a negative plate connected with the negative lug; the solid electrolyte layer is arranged between the positive electrode plate and the negative electrode plate; the lithium supplementing layer is arranged in the solid electrolyte layer and divides the solid electrolyte layer into a first solid electrolyte layer and a second solid electrolyte layer; the lithium supplementing layer comprises a porous conductive net and active lithium layers arranged on two sides of the porous conductive net; the porous conductive net is connected with a lithium supplementing tab. The utility model solves the problems of poor lithium supplementing effect and poor safety performance of the traditional negative electrode lithium supplementing technology, and the conductive net is adopted as the carrier of the lithium source, so that the lithium source can be at least partially filled into the pores of the conductive net, the whole thickness of the lithium supplementing layer can be effectively reduced, and the volume energy density and the quality energy density of the battery are improved.

Description

Solid-state battery and negative electrode lithium supplementing system

Technical Field

The utility model relates to the technical field of batteries, in particular to a solid-state battery and a negative electrode lithium supplementing system.

Background

With the rapid development of new energy automobiles, lithium ion batteries are also being widely focused as important component parts; at present, the automobile industry generally requires that the lithium ion battery can simultaneously give consideration to high energy density and long cycle performance, and in order to achieve the performance target, part of battery enterprises put the developed center of gravity in the lithium supplementing technology, wherein the lithium supplementing effect of the negative electrode is remarkable.

Firstly, the cathode lithium supplementing technology can provide a part of lithium to participate in forming an SEI film (solid electrolyte interphase, solid electrolyte interface film) on the surface of the cathode, so that the consumption of active lithium of a cathode material is reduced, the gram capacity of the first discharge of the cathode is improved, and the energy density of a battery is improved; and secondly, the negative electrode lithium supplementing technology can additionally provide more lithium to be stored in the negative electrode, and supplement active lithium consumed by continuously thickening the SEI film on the surface of the negative electrode in the long-term circulation process, so that the battery is ensured to have long-term circulation performance.

The traditional negative electrode lithium supplementing method mainly comprises two modes:

one is calendaring lithium supplement, namely, metal lithium foil is adhered to the surface of a negative plate through a cold pressing procedure, but the lithium foil is easily adhered to the upper surface of a compression roller in the calendaring process, so that the lithium on the negative plate is very unevenly distributed, and the safety performance of a battery is further influenced;

the other type of negative electrode lithium supplementing adopts slurry lithium supplementing, namely, a passivation layer is firstly prepared on the surface of lithium powder, then lithium supplementing slurry is prepared, and the lithium supplementing slurry is uniformly coated on the surface of the cold-pressed negative electrode sheet through a coating procedure; because the passivation layer is coated on the surface of the lithium powder, the passivation layer on the surface is required to be supercooled and pressed to release part of active lithium so as to achieve the effect of supplementing lithium on the surface of the negative electrode, but the active substance on the negative electrode plate is pressed down due to too large cold pressing frequent pressure, so that the negative electrode lithium removal and lithium intercalation are difficult to perform, the part of coating layer is difficult to damage due to small cold pressing pressure, the active lithium is difficult to release, and the effect of supplementing lithium cannot be achieved.

Disclosure of Invention

The utility model aims to provide a solid-state battery and a negative electrode lithium supplementing system, which are used for solving the problems that the lithium supplementing effect is poor and the safety performance of the battery is influenced in the traditional negative electrode lithium supplementing technology, and the volume energy density and the quality energy density of the battery are reduced due to the fact that the lithium supplementing structure is too thick.

To achieve the purpose, the utility model adopts the following technical scheme:

a solid-state battery, comprising: an electrode assembly including

The positive plate is connected with the positive lug;

the negative plate is connected with the negative lug;

a solid electrolyte layer group disposed between the positive electrode sheet and the negative electrode sheet; the solid electrolyte layer group comprises a first solid electrolyte layer, a lithium supplementing layer and a second solid electrolyte layer;

the lithium supplementing layer is arranged between the first solid electrolyte layer and the second solid electrolyte layer; the lithium supplementing layer comprises a porous conductive net and active lithium layers arranged on two sides of the porous conductive net; the porous conductive net is connected with a lithium supplementing tab.

Optionally, the thickness of the first solid electrolyte layer disposed adjacent to the negative electrode sheet is h1; the second solid electrolyte layer arranged close to the positive plate is h2; the above parameters satisfy the following relation: 1.5h1< h2,7um < h1<50um,10um < h2<60um.

Optionally, also include

A housing having an open mouth and a receiving cavity in communication with the open mouth;

a cap assembly fixedly connected with the housing and sealing the open mouth; the electrode assembly is disposed in the receiving chamber.

Optionally, the top cover assembly includes a positive pole and a negative pole, the positive pole ear is connected with the positive pole, and the negative pole ear is connected with the negative pole; the lithium supplementing tab is connected with the shell.

Optionally, the top cover assembly comprises a positive pole, a negative pole and a lithium supplementing pole; the positive electrode lug is connected with the positive electrode post, and the negative electrode lug is connected with the negative electrode post; and the lithium supplementing tab is connected with the lithium supplementing pole.

Optionally, the conductive mesh is a self-supporting porous conductive polyaniline fiber mesh.

Optionally, the active lithium layer includes at least one of lithium powder particles, lithium-silicon alloy particles, and lithium-aluminum alloy particles.

Optionally, the thickness of the conductive mesh is h3,5um < h3<30um; the thickness of the active lithium layer is h4, 10um < h4<40um.

Optionally, the area of the active lithium layer in the lithium supplementing layer does not exceed the area of the positive electrode active material layer in the positive electrode sheet, and the edge of the active lithium layer does not exceed the edge of the positive electrode active material layer in the positive electrode sheet.

The utility model relates to a negative electrode lithium supplementing system, which comprises a power supply and the solid-state battery; the positive pole of the power supply is electrically connected with the negative pole post, and the negative pole of the power supply is electrically connected with the lithium supplementing tab.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects:

the solid-state battery of the utility model is characterized in that a lithium supplementing layer is additionally arranged in a solid-state electrolyte layer, and the lithium supplementing layer separates the solid-state electrolyte layer with non-conductive electrons into a first solid-state electrolyte layer and a second solid-state electrolyte layer; in the lithium supplementing operation, a lithium supplementing tab connected with the lithium supplementing layer is electrically connected with a negative electrode of an external power supply, and a negative electrode tab connected with the negative electrode sheet is electrically connected with a positive electrode of the external power supply, so that metal lithium in the active lithium layer loses electrons to form lithium ions, and the lithium ions are inserted into the negative electrode sheet, thereby realizing negative electrode lithium supplementing; in addition, the lithium supplementing layer comprises a porous conductive net and an active lithium layer loaded on the porous conductive net, and because the porous conductive net is used as a carrier of a lithium source, the lithium source is at least partially filled into the pores of the porous conductive net, and compared with the mode of adopting other carriers (such as foil materials), the overall thickness of the whole lithium supplementing layer can be effectively reduced on the premise of ensuring the basic lithium supplementing function and effect, so that the volume energy density and the mass energy density of the electrode assembly are improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a cross-sectional view of an electrode assembly provided in an embodiment of the present utility model;

fig. 2 is a structural view of a negative electrode lithium supplementing system according to an embodiment of the present utility model;

fig. 3 is a structural view of another negative electrode lithium supplementing system according to an embodiment of the present utility model.

Reference numerals illustrate:

the lithium ion battery comprises a shell 1, a top cover assembly 2, a positive electrode column 21, a negative electrode column 22, a lithium supplementing electrode column 23, an electrode assembly 3, a positive electrode sheet 31, a negative electrode sheet 32, a first solid electrolyte layer 331, a second solid electrolyte layer 332, a lithium supplementing layer 34, a porous conductive net 341, an active lithium layer 342, a positive electrode lug 35, a negative electrode lug 36, a lithium supplementing electrode lug 37 and a power supply 4.

Detailed Description

In order to make the objects, features and advantages of the present utility model more comprehensible, the technical solutions in the embodiments of the present utility model are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order to solve the problems of poor lithium supplementing effect and poor safety performance of the traditional lithium supplementing mode, the utility model provides a solid-state battery and a negative electrode lithium supplementing system, and the lithium supplementing structure of an electrode assembly is changed by combining the actual high-energy density requirement from the basis of a lithium supplementing mechanism, so that the controllable lithium supplementing of the battery cell level is realized.

Referring to fig. 1, a solid-state battery according to an embodiment of the present utility model includes an electrode assembly 3, the electrode assembly 3 including:

a positive electrode tab 31, the positive electrode tab 31 being connected to the positive electrode tab 35;

a negative electrode tab 32, the negative electrode tab 32 being connected to a negative electrode tab 36;

a solid electrolyte layer group provided between the positive electrode sheet 31 and the negative electrode sheet 32; the solid electrolyte layer group includes a lithium supplementing layer 34, a first solid electrolyte layer 331, and a second solid electrolyte layer 332;

the lithium supplementing layer 34 is disposed between the first solid electrolyte layer 331 and the second solid electrolyte layer 332; the lithium supplementing layer 34 comprises a porous conductive net 341 and active lithium layers 342 arranged at two sides of the porous conductive net 341; the porous conductive net 341 is connected with a lithium supplementing tab 37, wherein the lithium supplementing tab 37 can be specifically formed by die cutting after extending from the porous conductive net 341 to the outside, as shown in fig. 1.

Unlike conventional lithium batteries, the conventional calendaring lithium supplementing mode and slurry lithium supplementing mode are completely avoided, and lithium supplementing at ion level is realized, and in the embodiment, the lithium supplementing layer 34 is additionally arranged in the solid electrolyte layer 33, and the lithium supplementing layer 34 separates the solid electrolyte layer 33 with the ion conducting non-conducting electron into a first solid electrolyte layer and a second solid electrolyte layer; in the lithium supplementing operation, the lithium supplementing tab 37 connected to the lithium supplementing layer 34 is electrically connected to the negative electrode of the external power supply 4, and the negative electrode tab connected to the negative electrode tab is electrically connected to the positive electrode of the external power supply, so that the lithium metal in the active lithium layer 342 loses electrons to form lithium ions, and the lithium ions are inserted into the negative electrode tab 32, thereby realizing negative electrode lithium supplementing. The lithium supplementing mode can ensure that lithium supplementing to the negative electrode is uniform, and lithium consumed by film forming on the surface of the negative electrode active material can be basically provided through a lithium supplementing stage, so that the first discharge efficiency of the battery is greatly improved, and the reversible capacity of the battery is improved; and the operation method is simple, the process is simple, the cost is low, and the safety of the battery is ensured.

In addition, the lithium supplementing layer 34 includes a porous conductive mesh 341 and active lithium layers 342 disposed on both sides of the porous conductive mesh 341, and since the porous conductive mesh 341 is used as a carrier of a lithium source (i.e., the active lithium layers 342), the lithium source is at least partially filled into the pores of the porous conductive mesh 341, and compared with other carriers (such as a foil material), the overall thickness of the entire lithium supplementing layer 34 can be effectively reduced on the premise of ensuring the basic lithium supplementing function and effect, thereby improving the volumetric energy density and the mass energy density of the electrode assembly 3.

It should be noted that, in this embodiment, the electrode assembly 3 may be manufactured by a lamination assembly method or a winding assembly method, which is not particularly limited.

Because the by-products on the surface of the negative electrode plate 32 are more, the active lithium consumed by the negative electrode plate 32 is far greater than that consumed by the positive electrode plate 31, the first solid electrolyte layer 331 with a thinner thickness is beneficial to lithium ion intercalation into the negative electrode plate 32 so as to realize negative electrode lithium supplementation; however, the potential of the positive electrode material is high, and if the surface-coated second solid electrolyte layer 332 is too thin, micro short circuit of the second solid electrolyte layer 332 is easily caused by oxidation of part of the material; further, since the particle diameter (d50=12 to 18 um) of the negative electrode material is much larger than the particle diameter (d50=2 to 4 um) of the positive electrode material, the migration path of lithium ions in the negative electrode material is much larger than that in the positive electrode material, resulting in an increase in the diffusion resistance of the negative electrode.

Therefore, in order to solve the above problems, that is, to reduce the diffusion resistance of the negative electrode, avoid the occurrence of micro-short circuit at the positive electrode sheet 31, and realize rapid lithium supplementation to the negative electrode sheet 32, the thickness h1 of the first solid electrolyte layer 331 disposed near the negative electrode sheet 32 may be selected to be reduced as much as possible, so as to ensure that the thickness h2 of the second solid electrolyte layer 332 disposed near the positive electrode sheet 31 is larger. Specifically, the thickness h1 of the first solid electrolyte layer 331 disposed near the negative electrode sheet 32 and the thickness h2 of the second solid electrolyte layer 332 disposed near the positive electrode sheet 31 satisfy the following relationship: 1.5h1< h2,7um < h1<50um,10um < h2<60um; specifically, h1 may be any one of 8um, 10um, 20um, 25um, 30um, and 39um, and h2 may be any one of 12um, 16um, 32um, 38um, 46um, and 59 um.

Test comparative examples of a plurality of batches of cells are provided below to verify the effect of the thickness of the different first and second solid electrolyte layers 331, 332 on cell performance.

TABLE 1 influence of solid electrolyte layer thickness on electrical properties

NCM613 system	H1(um)	H2(um)	Internal resistance average value of battery (mΩ)	Self-discharge mean value (mV/h)
					First batch of batteries	8	16	300	0.06
Second batch of batteries	11	11	450	0.03
					Third batch of cells	8	11	250	0.2

In table 1, there were 100 batteries in each batch, and the formulation was the same as that of the mechanical part, and only the thicknesses of the first solid electrolyte layer 331 and the second solid electrolyte layer 332 were different.

And (3) testing the internal resistance average value of the battery: and after all the three batches of batteries are fully charged to 4.4V, testing the internal resistance of each battery through an internal resistance instrument, wherein the internal resistance instrument testing frequency is 1000Hz, and taking the average value of the internal resistances of each batch of batteries as the average value of the internal resistances of the batteries in the table.

Self-discharge mean value test: after all three batches of batteries are fully charged to 4.4V, the voltage value V1 of each battery is tested after standing for 72 hours at room temperature, then the voltage value V2 of each battery is tested after standing for 48 hours, and the self-discharge average value of the batteries is= (V1-V2)/48.

As is known from the three battery experiments, the thickness of the first solid electrolyte layer 331 near the negative electrode sheet 32 has a large influence on the internal resistance, but has a small influence on the self-discharge; while the thickness of the second solid electrolyte layer 332 near the positive electrode sheet 31 has little influence on the internal resistance, but has a large influence on the self-discharge. Therefore, in consideration of the above, the first solid electrolyte layer 331 is preferably thinner than the second solid electrolyte layer 332, which contributes to the development of the optimum electrical performance of the battery.

The solid-state battery further comprises a case 1 and a top cover assembly 2; the shell 1 is provided with an opening and a containing cavity communicated with the opening, and the top cover assembly 2 is fixedly connected with the shell 1 and seals the opening; the electrode assembly 3 is disposed in the receiving chamber.

In order to realize the construction of the lithium supplementing layer 34, the negative electrode sheet 32 and the external power supply 4 to form a lithium supplementing circuit, the following two implementation modes are provided in this embodiment:

referring to fig. 2, the top cover assembly 2 includes a positive electrode post 21 and a negative electrode post 22, a lithium supplementing tab 37 is electrically connected to the housing 1 through a conductive medium such as conductive adhesive, and the housing 1 is used for electrically connecting to the negative electrode of the power source 4. Based on this, the positive electrode of the external power source 4 is electrically connected to the negative electrode post 22 so that the negative electrode sheet 32 serves as a positive electrode, and the negative electrode of the external power source 4 is electrically connected to an arbitrary position of the casing 1 so that the lithium supplementing layer 34 serves as a negative electrode, so that negative electrode lithium supplementing can be realized.

Referring to fig. 3, the top cap assembly 2 includes a positive electrode post 21, a negative electrode post 22, and a lithium supplementing electrode post 23; the positive electrode lug 35 is connected with the positive electrode post 21, and the negative electrode lug 36 is connected with the negative electrode post 22; the lithium-supplementing tab 37 is connected to the lithium-supplementing post 23. In the lithium supplementing operation, the lithium supplementing pole 23 can be specifically connected with the negative electrode of the external power supply 4, so that the lithium supplementing layer 34 serves as the negative electrode, the negative pole 22 is connected with the positive electrode of the external power supply 4, so that the negative pole piece 32 serves as the positive electrode, and the negative lithium supplementing can be realized.

In the lithium supplementing process, a small current (for example, the discharge current is 0.0001C-0.1C, and C is the rated capacity of the battery core) can be selected for discharge, so that the metal lithium in the active lithium layer 342 loses electrons to form lithium ions, and the lithium ions are inserted into the negative electrode plate 32, thereby realizing the negative electrode lithium supplementing.

The porous conductive mesh 341 constituting the lithium supplementing layer 34 in this embodiment may be a self-supporting porous conductive PANI (polyaniline) fiber mesh or other types, and the active lithium layer 342 may be formed by coating one or more materials such as lithium powder particles, lithium-silicon alloy particles or lithium-aluminum alloy on the porous conductive mesh 341.

Optionally, the surface density of the selected porous conductive net 341 is smaller, so that a conductive material with low density is introduced as much as possible, the overall quality of the battery core is reduced, and the energy density is improved; the thickness of the porous conductive net 341 is h3, and the value range is 5um < h3<30um; the thickness of the active lithium layer 342 is h4, and the value range is 10um < h4<40um, and the thickness h4 is the thickness after coating and is not the thickness after cold pressing. In practical applications, the thickness of the active lithium layer 342 may be adjusted according to the actual lithium supplement amount, and the thickness of the porous conductive mesh 341 may be adjusted according to the actually required lithium source loading amount.

In this embodiment, the active lithium layer 342 is not subjected to cold pressing treatment, so that after the active lithium layer 342, the positive electrode sheet 31, the negative electrode sheet 32 and the solid electrolyte layer are assembled into a battery cell through winding or lamination, the effect of promoting the active lithium layer 342 and the porous conductive mesh 341 to be closely adhered through the hot pressing process can be achieved.

In addition, in order for lithium extracted from the positive electrode sheet 31 to have a sufficient accommodation space in the negative electrode sheet 32, the area of the negative electrode active material layer of the negative electrode sheet 32 is larger than that of the positive electrode active material layer of the positive electrode sheet 31. The edge of the negative electrode active material layer exceeds the edge of the positive electrode active material layer by 1mm to 3mm in consideration of the manufacturing process and coating tolerance.

Since the purpose of the active lithium layer 342 is to supplement active lithium consumed in the negative electrode sheet 32 to generate an SEI film, when the active lithium layer 342 exceeds the positive electrode sheet 31, the active lithium layer 342 at the exceeding position is not provided with the positive electrode sheet 31 although it can be supplemented into the negative electrode sheet 32 by an external voltage, so that lithium ions cannot be intercalated back into the active material of the positive electrode sheet 31 during discharge, i.e., the active lithium layer 342 at the exceeding position does not achieve an actual lithium supplementing effect, and thus the area of the active lithium layer 342 in this embodiment does not exceed the area of the positive electrode active material layer in the positive electrode sheet 31, and the edge of the active lithium layer 342 does not exceed the edge of the positive electrode active material layer in the positive electrode sheet 31.

Referring to fig. 3, the present utility model further provides a negative electrode lithium supplementing system, which includes a power source 4 and a solid-state battery as described above; the positive electrode of the power supply 4 is electrically connected with the negative electrode post 22, and the negative electrode of the power supply 4 is electrically connected with the lithium supplementing post 23.

The following comparative examples of test results of different lithium batteries when the negative electrode is not lithium-supplemented, when the conventional method is applied, and after the negative electrode is lithium-supplemented by the method of this embodiment are provided based on 117Ah battery cells (the length, width and height of the battery are 42×177×108mm3 respectively), so as to verify the influence of the negative electrode lithium-supplementing scheme of this embodiment on the cycle life and energy density of the battery.

TABLE 2 influence of different lithium supplementation modes on battery cycle life

TABLE 3 influence of different lithium supplementation modes on energy Density

The cycle life in Table 2 refers to cycles at 25℃and 0-80% SOC with an average rate of 0.5C0, and the specific cycle rate test is as follows:

and (3) testing the cycle performance: and standing the battery in an environment of 25 ℃ for 5min, discharging to 2.8V at a constant current of 0.33C, standing for 30min, charging to 4.3V at a constant current of 0.5C, stopping CV until the current I is smaller than 5A, standing for 60min, discharging to 2.8V at a constant current of 0.33C, repeating the charging and discharging process until the battery capacity is reduced to 80% of the initial capacity, stopping the cycle test, and recording the cycle charge and discharge number at the moment as the cycle life.

The battery energy density in table 3 is battery discharge energy data obtained by 0.33C CC and CV to 4.4V (CV to current less than 5A cut-off) and then 0.33C discharge to 2.8V, battery mass energy density=0.33C discharge energy/battery weight.

As can be seen from tables 2 to 3, the cycle life and the battery energy density of the battery can be improved to a greater extent by applying the embodiments of the present utility model.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A solid-state battery, characterized by comprising: an electrode assembly (3), the electrode assembly (3) comprising

The positive plate (31), the positive plate (31) is connected with the positive lug (35);

a negative electrode sheet (32), wherein the negative electrode sheet (32) is connected with a negative electrode lug (36);

a solid electrolyte layer group provided between the positive electrode sheet (31) and the negative electrode sheet (32); the solid electrolyte layer group comprises a first solid electrolyte layer (331), a lithium supplementing layer (34) and a second solid electrolyte layer (332);

the lithium supplementing layer (34) is arranged between the first solid electrolyte layer (331) and the second solid electrolyte layer (332); the lithium supplementing layer (34) comprises a porous conductive net (341) and active lithium layers (342) arranged on two sides of the porous conductive net (341); the porous conductive net (341) is connected with a lithium supplementing tab (37).

2. A solid state battery according to claim 1, characterized in that the thickness of the first solid state electrolyte layer (331) arranged adjacent to the negative electrode sheet (32) is h1; a second solid electrolyte layer (332) disposed adjacent to the positive electrode sheet (31) is h2; the above parameters satisfy the following relation: 1.5h1< h2,7um < h1<50um,10um < h2<60um.

3. The solid-state battery according to claim 1, further comprising

A housing (1), the housing (1) having an open mouth and a receiving cavity in communication with the open mouth;

the top cover assembly (2), the top cover assembly (2) is fixedly connected with the shell (1) and seals the open mouth; the electrode assembly (3) is arranged in the accommodating cavity.

4. A solid-state battery according to claim 3, wherein the cap assembly (2) comprises a positive electrode post (21) and a negative electrode post (22), the positive electrode tab (35) being connected to the positive electrode post (21), the negative electrode tab (36) being connected to the negative electrode post (22); the lithium supplementing tab (37) is connected with the shell (1).

5. A solid state battery according to claim 3, characterized in that the cap assembly (2) comprises a positive electrode post (21), a negative electrode post (22) and a lithium-compensating electrode post (23); the positive electrode lug (35) is connected with the positive electrode column (21), and the negative electrode lug (36) is connected with the negative electrode column (22); the lithium supplementing tab (37) is connected with the lithium supplementing pole (23).

6. A solid state battery according to claim 1, characterized in that the porous conductive web (341) is a self-supporting porous conductive polyaniline fibrous web.

7. The solid state battery of claim 1, wherein the active lithium layer (342) comprises at least one of lithium powder particles, lithium-silicon alloy particles, lithium-aluminum alloy particles.

8. A solid state battery according to claim 1, characterized in that the thickness of the porous conductive web (341) is h3,5um < h3<30um; the thickness of the active lithium layer (342) is h4, 10um < h4<40um.

9. A solid state battery according to claim 1, characterized in that the area of the active lithium layer (342) in the lithium supplementing layer (34) does not exceed the area of the positive electrode active material layer in the positive electrode sheet (31), and the edge of the active lithium layer (342) does not exceed the edge of the positive electrode active material layer in the positive electrode sheet (31).

10. A negative electrode lithium-supplementing system, characterized by comprising a power supply (4) and a solid-state battery according to any one of claims 1 to 9; the positive electrode of the power supply (4) is electrically connected with the negative electrode lug (36), and the negative electrode of the power supply (4) is electrically connected with the lithium supplementing lug (37).