All-solid-state battery

Abstract

The utility model belongs to the technical field of batteries, and discloses an all-solid-state battery. The all-solid-state battery comprises a package, a battery cell assembly, a total positive electrode and a total negative electrode, the package wraps the battery cell assembly in a sealed mode, and the total positive electrode and the total negative electrode are connected to the peripheral side of the package and electrically connected with the battery cell assembly; the tiling area of the package is A, the thickness of the package is B, C = A / B, and C is larger than or equal to 5000 mm and smaller than or equal to 20000 mm. According to the all-solid-state battery, by increasing the packaging tiling area and reducing the packaging thickness, the uniformity of the whole all-solid-state battery is better, so that the pressure transmission of the all-solid-state battery from the inside to the surface is smoother, the pressure of the inside and the surface layer of the all-solid-state battery is balanced, and the phenomenon that after the all-solid-state battery is used for a period of time, the battery cannot be damaged is avoided. And the electrical property of the position with larger pressure is quickly reduced, so that the service life of the all-solid-state battery is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a all-solid-state battery. Background Art

[0002] For all-solid-state batteries, the uniformity of forming and working pressure has a great impact on their performance. In order to provide uniform pressure, the current structure of all-solid-state batteries is generally a multi-layer laminated soft package. However, due to the precision problem of the manufacturing process, the thickness of each laminated sheet often shows non-uniformity on its respective plane, and the overall non-uniformity will increase sharply in the case of multi-layer stacking. During the manufacturing process, a state of non-uniform pressure distribution often occurs. Even if isostatic pressing technology is used, it will cause the battery to bend slightly or even break. There are also problems with pressure uniformity and pressure transmission during testing and use. The pressure deep inside the battery is often different from that on the surface layer, and the pressure is different everywhere inside the battery. The performance of the positions with larger pressure during the working process will gradually deteriorate until failure. Summary of the Utility Model

[0003] The purpose of this application is to provide an all-solid-state battery that can balance the pressure in the thickness direction of the all-solid-state battery, so that the pressure on the surface layer inside the all-solid-state battery tends to be uniform.

[0004] To achieve this purpose, the following technical solutions are adopted in this application:

[0005] An all-solid-state battery, comprising a package, a battery cell assembly, a total positive electrode, and a total negative electrode. The above-mentioned package is hermetically wrapped outside the above-mentioned battery cell assembly. The above-mentioned total positive electrode and the above-mentioned total negative electrode are both connected to the periphery of the above-mentioned package and are both electrically connected to the above-mentioned battery cell assembly;

[0006] The laying area of the above-mentioned package is A, the thickness of the above-mentioned package is B, C = A / B, and 5000 mm ≤ C ≤ 20000 mm.

[0007] As an optional solution, 750000 mm 2 ≤ A ≤ 2000000 mm 2 , 100 mm ≤ B ≤ 150 mm.

[0008] As an optional solution, define the length of the above-mentioned package as D, define the width of the above-mentioned package as E, F = D / E, and 1.5 ≤ F ≤ 4.

[0009] As an optional solution, 1500 mm ≤ D ≤ 2000 mm, 500 mm ≤ E ≤ 1000 mm.

[0010] As an optional solution, the above-mentioned battery cell assembly includes N battery cells arranged in layers, where:

[0011] 5 ≤ N ≤ 20; and / or

[0012] There is at least one heat dissipation layer provided between any two adjacent ones of the above-mentioned battery cells.

[0013] As an optional solution, the thickness of the above-mentioned heat dissipation layer is G, and 0.5 mm ≤ G ≤ 5 mm.

[0014] As an optional solution, the above-mentioned all-solid-state battery further includes a total positive electrode and a total negative electrode both protruding from the peripheral side of the above-mentioned package. N of the above-mentioned battery cells are connected in series. The positive electrode of one of the above-mentioned battery cells is connected to the above-mentioned total positive electrode, and the negative electrode of one of the battery cells is connected to the above-mentioned total negative electrode.

[0015] As an optional solution, the above-mentioned battery cell includes:

[0016] a positive electrode assembly;

[0017] a negative electrode assembly and an electrolyte layer. The above-mentioned negative electrode assemblies are provided on both sides of the above-mentioned positive electrode assembly, and the above-mentioned electrolyte layer is provided between the above-mentioned positive electrode assembly and the corresponding side of the above-mentioned negative electrode assembly.

[0018] As an optional solution, the above-mentioned positive electrode assembly includes a positive electrode tab and a positive electrode coating. The above-mentioned positive electrode coatings are coated on both sides of the above-mentioned positive electrode tab, and the above-mentioned electrolyte layer on the corresponding side is stacked on the side of each above-mentioned positive electrode coating facing away from the above-mentioned positive electrode tab; and / or

[0019] The above-mentioned negative electrode assembly includes a negative electrode coating, a negative electrode tab, and an insulating layer. The above-mentioned negative electrode coating, the above-mentioned negative electrode coating, and the above-mentioned insulating layer are sequentially stacked on the side of the above-mentioned electrolyte layer facing away from the above-mentioned positive electrode coating. As an optional solution, the four sides of the above-mentioned package are sealed to form four flat side-sealing areas, and the above-mentioned total positive electrode and the above-mentioned total negative electrode respectively protrude from two opposite side-sealing areas.

[0020] Advantages of the present application:

[0021] The present application provides an all-solid-state battery. By increasing the laying area of the package and reducing the thickness of the package, when the area of the all-solid-state battery on the laying plane is larger, the non-uniformity between layers of the all-solid-state battery is weakened more significantly. At the same time, the thickness of the all-solid-state battery is made smaller, and in the thickness direction, the cumulative amount of thickness non-uniformity is smaller, so that the uniformity of the entire all-solid-state battery is better, and further, the pressure transmission from the inside to the surface of the all-solid-state battery is smoother, the pressure inside and on the surface of the all-solid-state battery is balanced, and it is avoided that the electrical performance of the position with a large pressure drops rapidly after the all-solid-state battery is used for a period of time, thereby prolonging the service life of the all-solid-state battery. Description of the Drawings

[0022] To more clearly and understandably illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The following described drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a all-solid-state battery provided by an embodiment of the present application;

[0024] Figure 2 It is an internal structural diagram of a all-solid-state battery provided by an embodiment of the present application;

[0025] Figure 3 It is a schematic structural diagram of a battery cell provided by an embodiment of the present application.

[0026] In the figure:

[0027] 10. Encapsulation; 11. Side sealing area;

[0028] 20. Battery cell assembly; 21. Battery cell; 211. Positive electrode assembly; 2111. Positive electrode tab; 2112. Positive electrode coating; 212. Electrolyte layer;

[0029] 213. Negative electrode assembly; 2131. Negative electrode tab; 2132. Negative electrode coating; 2133. Insulating layer;

[0030] 22. Heat dissipation layer; 23. Positive electrode; 24. Negative electrode;

[0031] 30. Total positive electrode; 40. Total negative electrode. Detailed implementation manners

[0032] The following will further elaborate on the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present application, rather than limiting the present application. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present application rather than all the structures are shown in the drawings.

[0033] In the description of the present application, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationship terms such as "upper", "lower", "left" and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] This application provides a all-solid-state battery, and the pressure uniformity inside and on the surface layer of the all-solid-state battery is better. As Figure 1 and Figure 2 shown, the all-solid-state battery includes a package 10, a battery cell assembly 20, a total positive electrode 30 and a total negative electrode 40. The package 10 hermetically wraps the outside of the battery cell assembly 20. The total positive electrode 30 and the total negative electrode 40 are both connected to the peripheral side of the package 10 and are both electrically connected to the battery cell assembly 20. The laying area of the package 10 is A, the thickness of the package 10 is B mm, C = A / B, and 5000 mm ≤ C ≤ 20000 mm. For the above all-solid-state battery, by increasing the laying area of the package 10 and reducing the thickness of the package 10, when the area of the all-solid-state battery on the laying plane is larger, the non-uniformity between layers of the all-solid-state battery is weakened more significantly. At the same time, the thickness of the all-solid-state battery is made smaller, and in the thickness direction, the cumulative amount of thickness non-uniformity is smaller, so that the uniformity of the entire all-solid-state battery is better, and further ensures that the pressure transmission from the inside to the surface of the all-solid-state battery is smoother, balances the pressure inside and on the surface layer of the all-solid-state battery, avoids the rapid decline of the electrical performance at the position with larger pressure after the all-solid-state battery is used for a period of time, and extends the service life of the all-solid-state battery.

[0037] It should be noted that in this embodiment, the all-solid-state battery is installed on the vehicle chassis, and the vehicle chassis has a large planar installation space and can provide electric power for the vehicle. In other embodiments, the all-solid-state battery can be installed according to the actual usage situation, which is not limited herein.

[0038] Among them, when C < 5000 mm, the effect of pressure balance is poor. When C > 20000 mm, if the thickness of the package 10 is made too thin, it will affect the strength of the entire all-solid-state battery. Therefore, the range is set to 5000 mm ≤ C ≤ 20000 mm. Exemplarily, C can take values such as 5100 mm, 5200 mm, 5500 mm, 5700 mm, 6000 mm, 6500 mm, 7000 mm, 7500 mm, 8000 mm, 8500 mm, 9000 mm, 9500 mm, 10000 mm, 11000 mm, 12000 mm, 13000 mm, 14000 mm, 15000 mm, 16000 mm, 17000 mm, 18000 mm, 19000 mm, etc.

[0039] In some embodiments of the present application, 750000 mm 2 ≤ A ≤ 2000000 mm 2 , 100 mm ≤ B ≤ 150 mm. This makes the area of the all-solid-state battery suitable for most usage scenarios, and the thickness of the solid-state battery will not be too thick to occupy the usage space in the height direction. Exemplarily, A can take values such as 760000 mm 2 , 770000 mm 2 , 780000 mm 2 , 790000 mm 2 , 800000 mm 2 , 900000 mm 2 , 120000 mm 2 , 1400000 mm 2 , 1600000 mm 2 , 1800000 mm 2 etc., and B can take values such as 1110 mm, 120 mm, 130 mm, 140 mm, etc. Preferably, 100 mm ≤ B ≤ 125 mm. Appropriately reducing the thickness of the package 10 can effectively increase the uniformity of pressure transmission and keep the pressure in the thickness direction of the battery cell assembly 20 consistent.

[0040] In some embodiments of the present application, as Figure 1 shown, define the length of the package 10 as D, define the width of the package 10 as E, F = D / E, and 1.5 ≤ F ≤ 4. Under this aspect ratio, the torque distribution of the all-solid-state battery after being stressed is more uniform, avoiding the problem of damage at a certain position due to excessive torque in some areas. Exemplarily, E can take values such as 2.2, 2.5, 2.8, 3, 3.2, 3.4, etc. Preferably, 2.5 ≤ F ≤ 3.5 to better ensure the uniformity of the torque distribution of the all-solid-state battery after being stressed.

[0041] In some embodiments of the present application, 1500 mm ≤ D ≤ 2000 mm, 500 mm ≤ E ≤ 1000 mm. This setting can better adapt to the sizes of most usage scenarios. Exemplarily, D can take values such as 1600 mm, 1700 mm, 1800 mm, 1900 mm, etc., and E can take values such as 600 mm, 700 mm, 800 mm, 900 mm, etc.

[0042] In some embodiments of the present application, as Figure 2 shown, the battery cell assembly 20 includes N battery cells 21 arranged in a stacked manner, where 5 ≤ N ≤ 20. Exemplarily, N can take values such as 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. By appropriately reducing the number of battery cells 21, the thickness of the package 10 can be correspondingly thinned. As the number of stacked layers increases, the effect of uniform force transmission inside the battery cell assembly 20 decreases, and the force bearing in the middle area is uneven. The uniform force transmission can be basically maintained below 20 layers. Preferably, 5 ≤ N ≤ 10 to ensure the best effect of force transmission.

[0043] In some embodiments of the present application, as Figure 2 shown, the all-solid-state battery further includes a total positive electrode 30 and a total negative electrode 40 both extending from the peripheral side of the package 10. The N battery cells 21 are connected in series. The positive electrode 23 of one of the battery cells 21 is connected to the total positive electrode 30, and the negative electrode 24 of one of the battery cells 21 is connected to the total negative electrode 40. Through the series connection of the N battery cells 21, the formed all-solid-state battery can have a voltage that meets the usage requirements, increase the energy density of the all-solid-state battery, optimize the battery, and meet the usage requirements of the device. In addition, compared with the assembled structure of multiple battery cells 21 connected in parallel in the prior art with the same capacity, the all-solid-state battery in this embodiment reduces the use of wires, makes the structure of the battery with the same capacity more concise during use, and reduces costs.

[0044] In some embodiments of the present application, as Figure 3 shown, the battery cell 21 includes a positive electrode assembly 211, a negative electrode assembly 213, and an electrolyte layer 212. The negative electrode assemblies 213 are arranged on both sides of the positive electrode assembly 211, and the electrolyte layer 212 is arranged between the positive electrode assembly 211 and the corresponding negative electrode assembly 213. Through the above setting, compared with the scheme in the prior art where the positive electrode assembly 211 and the negative electrode assembly 213 are arranged in a one-to-one correspondence in the battery cell 21, the exchange rate of the active substances between the positive electrode assembly 211 and the negative electrode assembly 213 is higher, the amount of electricity that a single battery cell 21 can provide is more, and the setting of a group of positive electrode assemblies 211 can be omitted.

[0045] In some embodiments of the present application, the positive electrode assembly 211 includes a positive electrode tab 2111 and a positive electrode coating 2112. The positive electrode coating 2112 is coated on both sides of the positive electrode tab 2111, and an electrolyte layer 212 corresponding to each side is stacked on the side of each positive electrode coating 2112 facing away from the positive electrode tab 2111. It should be noted that the positive electrode tab 2111 is also called the positive electrode current collector. Figure 2 In this case, the positive electrode 23 of a single battery cell 21 can be formed by extending the positive electrode tab 2111, or can be formed by welding externally to the positive electrode tab 2111. This solution can select a positive electrode 23 with an appropriate thickness for the battery cell 21 to ensure that the strength of the positive electrode 23 is sufficient. Among them, the positive electrode active material mainly exists in the positive electrode coating 2112 and performs ion exchange with the negative electrode assembly 213.

[0046] In some embodiments of the present application, such as Figure 3 As shown, the negative electrode assembly 213 includes a negative electrode coating 2132, a negative electrode tab 2131, and an insulating layer 2133. The negative electrode coating 2132, the negative electrode coating 2132, and the insulating layer 2133 are stacked in sequence on the side of the electrolyte layer 212 facing away from the positive electrode coating 2112. Through the above arrangement, the insulating layer 2133 can play a role in insulating from the negative electrode tab 2131 of the adjacent battery cell 21. At the same time, the insulating layer 2133 can also play a good supporting role, improving the structural strength of the surface of each battery cell 21 and enhancing the compressive and bending resistance under the premise of multi-layer stacking. Among them, the negative electrode active material mainly exists in the negative electrode coating 2132 to perform ion exchange with the positive electrode assembly 211. It should be noted that the negative electrode tab 2131 is also called the negative electrode current collector. The negative electrode 24 of a single battery cell 21 can be formed by extending the negative electrode tab 2131 (the two extended negative electrode tabs 2131 are welded together), or can be formed by welding externally to the negative electrode tab 2131. This solution can select a negative electrode 24 with an appropriate thickness for the battery cell 21 to ensure that the strength of the negative electrode 24 is sufficient.

[0047] For all-solid-state batteries, due to their higher internal resistance than liquid batteries, serious temperature rise effects occur during fast charging and discharging, which is not conducive to the stable operation of the battery. Generally, a suitable heat dissipation layer 22 and a heat insulation layer are provided in the battery to play a temperature control role. However, this layer is far from the inside of the battery cell assembly 20, and the heat conduction effect is poor, making it difficult to meet the requirements.

[0048] To solve the above problems, as Figure 2 shown, at least a heat dissipation layer 22 is provided between any two adjacent battery cells 21. By providing the heat dissipation layer 22 inside the battery cell assembly 20, heat can be transferred from the inside of the battery cell assembly 20 to the surface more quickly, thereby maintaining the temperature uniformity of the battery cell assembly 20. Compared with traditional laminated or wound batteries, the heat dissipation effect is better. Moreover, the solid electrolyte does not have fluidity, avoiding the risk of corrosion of the heat dissipation layer 22.

[0049] In some embodiments of the present application, the heat dissipation layer 22 is a graphene aerogel layer, which can achieve the effect of stress homogenization, making the force transmission inside the battery cell assembly 20 more controllable and consistent, and contributing to improving the cycle stability of the battery cell assembly 20.

[0050] In some embodiments of the present application, as Figure 2 shown, the thickness of the heat dissipation layer 22 is G, and 0.5 mm ≤ G ≤ 5 mm. Here, when G > 5 mm, the increase in the overall thickness of the battery cell assembly 20 is relatively obvious, which is not conducive to reducing the thickness of the battery cell assembly 20. When G < 0.5 mm, the effects of heat dissipation and stress homogenization are poor. Therefore, the range of G is set to 0.5 mm ≤ G ≤ 5 mm. Exemplarily, the value of G can be selected as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc. Preferably, 1 mm ≤ G ≤ 3 mm. Further preferably, G = 1.2 mm. When the heat dissipation layer 22 is too thin, it cannot withstand the volume expansion change during the operation of the battery cell assembly 20, and it is difficult to evenly transmit the force. When the heat dissipation layer 22 is too thick, the aerogel will be severely deformed during the battery pressurization process, affecting the internal structure of the battery.

[0051] In some embodiments of the present application, as Figure 1 shown, the four sides of the package 10 are sealed to form four flat side-sealed areas 11, and the above-mentioned total positive electrode 30 and the above-mentioned total negative electrode 40 respectively extend from two opposite side-sealed areas 11. Through the above arrangement, the package 10 seals the outside of the battery cell assembly 20, preventing water vapor and the like from entering the inside, which may affect the performance of the battery cell assembly 20, or preventing water vapor from reacting with the material of the battery cell 21 to generate toxic gases and the like.

[0052] In some embodiments of the present application, the outer surface of the package 10 is wrapped with an aluminum-plastic film, which can better play a sealing role and prevent the entry of external gases or liquids. In addition, since the battery cell assembly wrapped inside the aluminum-plastic film is solid-state, compared with a soft-pack battery, the battery cell assembly is not prone to displacement. That is to say, the battery cell assembly and the aluminum-plastic film can support the shape of the entire all-solid-state battery, reducing the wear on the surface of the aluminum-plastic film and ensuring that the battery life of the all-solid-state battery will not decrease due to the wear of the aluminum-plastic film.

[0053] In some embodiments of the present application, the shape of the battery cell assembly 20 can be cylindrical, cubic, or polyhedral, etc. That is to say, the battery cell assembly 20 is formed by stacking layers rather than winding.

[0054] In some embodiments of the present application, the all-solid-state battery provided in this embodiment can be applied to vehicles. Specifically, the vehicles can include commercial vehicles, special vehicles, electric bicycles, electric motorcycles, electric scooters, etc., which are electric vehicles that need to use all-solid-state batteries to provide electrical energy to drive them.

[0055] Exemplarily, the measurement data of all-solid-state batteries of different specifications are shown in Table 1.

[0056] Table 1

[0057]

[0058] In the table, the higher the data value of the proportion of the pressure-uniform area, the better the pressure uniformity of the solid-state battery.

[0059] For the first group of data, in Example 1, the tiled area is 1,500,000 mm 2 , the thickness is 100 mm, the C value is 20,000, the encapsulation length is 1500 mm, the encapsulation width is 1000 mm, the F value is 1.5, the number of battery cells is 5, and the thickness of the heat dissipation layer is 0.5 mm. All the above parameters are within the parameter range given in this embodiment. The single-cell battery capacity is 101.8 Ah, the single-cell battery power is 351.2 Wh, the single-cell battery mass is 1.028 Kg, the battery energy density is 341.6 Wh / Kg, and the proportion of the pressure-uniform area is 91.28%; in Comparative Example 1, the thickness is 160 mm, which is not within the parameter range given in this embodiment, the battery energy density is 324.6 Wh / Kg, and other parameters are the same as those in Example 1. The proportion of the pressure-uniform area is 90.12%. The proportion of the pressure-uniform area in Example 1 is 1.16% higher than that in Comparative Example 1.

[0060] For the second group of data, in Example 2, the tiled area is 1,661,750 mm 2 , the thickness is 110 mm, the C value is 15,000, the encapsulation length is 1955 mm, the encapsulation width is 850 mm, the F value is 2.3, the number of battery cells is 7, and the thickness of the heat dissipation layer is 1 mm. All the above parameters are within the parameter range given in this embodiment. The single-cell battery capacity is 112.9 Ah, the single-cell battery power is 389.5 Wh, the single-cell battery mass is 1.126 Kg, the battery energy density is 345.9 Wh / Kg, and the proportion of the pressure-uniform area is 90.33%; in Comparative Example 2, the thickness is 170 mm, which is not within the parameter range given in this embodiment, the battery energy density is 318.2 Wh / Kg, and other parameters are the same as those in Example 2. The proportion of the pressure-uniform area is 88.43%. The proportion of the pressure-uniform area in Example 2 is 1.9% higher than that in Comparative Example 2.

[0061] For the third group of data, in Example 3, the tiled area is 1,267,500 mm 2, with a thickness of 120 m, a C value of 10000, a packaging length of 1950 mm, a packaging width of 650 mm, an F value of 3, 10 battery cells, and a heat dissipation layer thickness of 2 mm. All the above parameters are within the parameter range given in this embodiment. The single - cell battery capacity is 86.2 Ah, the single - cell battery power is 297.4 Wh, the single - cell battery mass is 0.863 Kg, the battery energy density is 344.6 Wh / Kg, and the proportion of the pressure - uniform area is 97.43%; in Comparative Example 3, the thickness is 180 mm, which is not within the parameter range given in this embodiment, the battery energy density is 292.9 Wh / Kg, and other parameters are the same as those in Example 3. The proportion of the pressure - uniform area in Example 3 is 3.2% higher than that in Comparative Example 3.

[0062] The fourth set of data. In Example 4, the tiled area is 1028500 mm 2 , with a thickness of 130 m, a C value of 8000, a packaging length of 1870 mm, a packaging width of 550 mm, an F value of 3.4, 13 battery cells, and a heat dissipation layer thickness of 3 mm. All the above parameters are within the parameter range given in this embodiment. The single - cell battery capacity is 69.7 Ah, the single - cell battery power is 240.5 Wh, the single - cell battery mass is 0.704 Kg, the battery energy density is 341.6 Wh / Kg, and the proportion of the pressure - uniform area is 95.89%; in Comparative Example 1, the thickness is 160 mm, which is not within the parameter range given in this embodiment, the battery energy density is 300.6 Wh / Kg, and other parameters are the same as those in Example 4. The proportion of the pressure - uniform area in Example 4 is 2.12% higher than that in Comparative Example 4;

[0063] The fifth set of data. In Example 5, the tiled area is 1500000 mm 2 , with a thickness of 100 m, a C value of 20000, a packaging length of 1500 mm, a packaging width of 1000 mm, an F value of 1.5, 5 battery cells, and a heat dissipation layer thickness of 0.5 mm. All the above parameters are within the parameter range given in this embodiment. The single - cell battery capacity is 101.8 Ah, the single - cell battery power is 351.2 Wh, the single - cell battery mass is 1.028 Kg, the battery energy density is 341.6 Wh / Kg, and the proportion of the pressure - uniform area is 91.28%; in Comparative Example 5, the thickness is 160 mm, which is not within the parameter range given in this embodiment, the battery energy density is 324.4 Wh / Kg, and other parameters are the same as those in Example 5. The proportion of the pressure - uniform area in Example 5 is 2.46% higher than that in Comparative Example 5.

[0064] In summary, when the thickness parameter is changed to a value outside the parameter range of this embodiment, it can be seen from the above data that for the all-solid-state battery in this embodiment, in each set of examples and comparisons, among the data of the examples, the proportion of the pressure-uniform area is relatively high. In particular, the parameter of thickness has a greater impact on the proportion of the pressure-uniform area. When the thickness is set to a value outside the given range, the proportion of the pressure-uniform area decreases. Therefore, the solid-state battery that meets the data range of this embodiment performs more prominently in terms of balancing pressure, avoiding the problem of deterioration of the battery's electrical performance after long-term use due to uneven pressure.

[0065] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, rather than limiting the implementation manners of the present application. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. All-solid-state battery, characterized in that: The invention comprises a package (10), a battery cell assembly (20), a total positive electrode (30) and a total negative electrode (40), wherein the package (10) is sealed and wrapped around the outside of the battery cell assembly (20), and the total positive electrode (30) and the total negative electrode (40) are both connected to the peripheral side of the package (10) and are both electrically connected to the battery cell assembly (20); The paving area of ​​the package (10) is A, the thickness of the package (10) is B, C=A / B, 5000mm≤C≤20000mm.

2. The all-solid-state battery according to claim 1, characterized in that: 750000mm 2 ≤A≤2000000mm 2 ,100mm≤B≤150mm。 3. The all-solid-state battery according to claim 1, characterized in that: The length of the package (10) is defined as D, the width of the package (10) is defined as E, F=D / E, 1.5≤F≤4.

4. The all-solid-state battery according to claim 3, characterized in that: 1500mm≤D≤2000mm, 500mm≤E≤1000mm.

5. The all-solid-state battery according to any one of claims 1 to 4, characterized in that: The battery cell assembly (20) comprises N battery cells (21) arranged in a stacked manner, wherein: 5≤N≤20; and / or A heat dissipation layer (22) is provided between at least any two adjacent battery cells (21).

6. The all-solid-state battery according to claim 5, characterized in that: The thickness of the heat dissipation layer (22) is G, 0.5 mm≤G≤5 mm.

7. The all-solid-state battery according to claim 5, characterized in that: The all-solid-state battery further comprises a total positive electrode (30) and a total negative electrode (40) both extending from the peripheral side of the package (10); N battery cells (21) are arranged in series, the positive electrode (23) of one of the battery cells (21) is connected to the total positive electrode (30), and the negative electrode (24) of one of the battery cells (21) is connected to the total negative electrode (40).

8. The all-solid-state battery according to claim 5, characterized in that: The battery cell (21) comprises: A positive electrode assembly (211); A negative electrode assembly (213) and an electrolyte layer (212), wherein the negative electrode assembly (213) is disposed on both sides of the positive electrode assembly (211), and the electrolyte layer (212) is disposed between the positive electrode assembly (211) and the negative electrode assembly (213) on the corresponding side.

9. The all-solid-state battery according to claim 8, characterized in that: The positive electrode assembly (211) comprises a positive electrode plate (2111) and a positive electrode coating (2112), both sides of the positive electrode plate (2111) are coated with the positive electrode coating (2112), and the electrolyte layer (212) on the corresponding side of each positive electrode coating (2112) facing away from the positive electrode plate (2111); and / or The negative electrode assembly (213) comprises a negative electrode coating (2132), a negative electrode plate (2131) and an insulating layer (2133), wherein the negative electrode coating (2132), the negative electrode coating (2132) and the insulating layer (2133) are sequentially stacked on a side of the electrolyte layer (212) away from the positive electrode coating (2112).

10. The all-solid-state battery according to any one of claims 1 to 4, characterized in that: The four sides of the package (10) are sealed to form four flat side sealing areas (11), and the total positive electrode (30) and the total negative electrode (40) extend out from two opposite side sealing areas (11), respectively.

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