All-solid-state battery

Abstract

The invention discloses an all-solid-state battery which comprises a laminated battery cell unit, the battery cell unit comprises a composite positive plate and a composite negative plate which are laminated, at least one of the composite positive plate and the composite negative plate comprises a solid electrolyte layer, and the composite positive plate and the composite negative plate are staggered along a second direction after being laminated and aligned, the composite negative electrode plate and the composite positive electrode plate are respectively used as a first insulating strip and a carrier of the first insulating strip, the first insulating strip and the positive electrode main body are arranged on the same layer and wrap the second side edge of the positive electrode main body, and the second insulating strip and the negative electrode main body are arranged on the same layer and wrap the third side edge; therefore, the side edges of the composite positive plate and the composite negative plate are wrapped in an insulating manner, and positive and negative electrode short circuit in the densification process is prevented.

Description

Technical Field

[0001] This invention relates to the field of lithium batteries, and more specifically, to an all-solid-state battery. Background Technology

[0002] Solid-state batteries are a new generation of batteries used in pure electric vehicles. Compared with traditional liquid lithium-ion batteries that use electrolytes, solid-state batteries have the advantage of increased energy storage capacity. A solid-state battery is a battery in which all components are solid-state.

[0003] Lithium-ion batteries and other rechargeable batteries (rechargeable, reusable batteries) basically consist of two electrodes (positive and negative) made of metal and an electrolyte filling the space between them. Traditional rechargeable batteries use liquid electrolytes, while all-solid-state batteries use solid electrolytes. Making the electrolyte solid allows for batteries with larger capacity and higher power than lithium-ion batteries. Furthermore, making the electrolyte solid also offers the advantage of safety compared to lithium-ion batteries, making its application in electric vehicles and other applications noteworthy. The working principle of all-solid-state batteries is almost identical to that of lithium-ion batteries. Metal is used as the electrode material, and ions move between the positive and negative electrodes through the electrolyte, thus generating an electrical flow. All-solid-state batteries do not require a separator between the positive and negative electrodes.

[0004] In existing technologies, there is a problem of short circuit between the positive and negative electrodes when manufacturing all-solid-state batteries, especially during the densification process.

[0005] Therefore, there is an urgent need to provide a fully solid-state battery that can prevent short circuits between the positive and negative electrodes. Summary of the Invention

[0006] In view of this, the present invention provides an all-solid-state battery to solve the problem of short circuit between the positive and negative electrodes.

[0007] This invention provides an all-solid-state battery, comprising stacked cell units, each cell unit including stacked composite positive electrode and composite negative electrode, wherein at least one of the composite positive electrode and the composite negative electrode includes a solid electrolyte layer.

[0008] The positive electrode tab of the composite positive electrode sheet and the negative electrode tab of the composite negative electrode sheet are arranged opposite to each other along a first direction;

[0009] The positive electrode body of the composite positive electrode sheet includes a first edge region and a second side disposed opposite to each other along a second direction, and the negative electrode body of the composite negative electrode sheet includes a third side and a fourth edge region disposed opposite to each other along the second direction. The second direction intersects the first direction. Along the thickness direction of the all-solid-state battery, the third side is located within the first edge region, and the second side is located within the fourth edge region.

[0010] It also includes an insulating strip, which includes a first insulating strip and a second insulating strip. The first insulating strip is disposed in the same layer as the positive electrode body and wraps around the second side. Along the thickness direction of the all-solid-state battery, the first insulating strip is located within the fourth edge region. And / or, the second insulating strip is disposed in the same layer as the negative electrode body and wraps around the third side. Along the thickness direction of the all-solid-state battery, the second insulating strip is located within the first edge region.

[0011] Optionally, the positive electrode body of the composite positive electrode sheet further includes a fifth side and a sixth edge region disposed opposite to each other along the first direction, wherein the fifth side is the opposite side of the positive electrode tab, and the negative electrode body of the composite negative electrode sheet includes a seventh edge region and an eighth side disposed opposite to each other along the first direction, wherein the eighth side is the opposite side of the negative electrode tab, and along the thickness direction of the all-solid-state battery, the fifth side is located within the seventh edge region, and the eighth side is located within the sixth edge region;

[0012] The insulating strip further includes a third insulating strip and a fourth insulating strip. The third insulating strip is disposed in the same layer as the positive electrode body and wraps around the fifth side. Along the thickness direction of the all-solid-state battery, the third insulating strip is located within the seventh edge region. And / or, the fourth insulating strip is disposed in the same layer as the negative electrode body and wraps around the eighth side. Along the thickness direction of the all-solid-state battery, the fourth insulating strip is located within the sixth edge region.

[0013] Optionally, along the thickness direction of the all-solid-state battery, the thickness of the first insulating strip is equal to the thickness of the positive electrode body;

[0014] And / or, along the thickness direction of the all-solid-state battery, the thickness of the second insulating strip is equal to the thickness of the negative electrode body.

[0015] Optionally, along the second direction, the width of the first insulating strip is not greater than the width of the fourth edge region;

[0016] And / or, along the second direction, the width of the second insulating strip is not greater than the width of the first edge region.

[0017] Optionally, along the thickness direction of the all-solid-state battery, the thickness of the third insulating strip is equal to the thickness of the positive electrode body;

[0018] And / or, along the thickness direction of the all-solid-state battery, the thickness of the fourth insulating strip is equal to the thickness of the negative electrode body.

[0019] Optionally, along the first direction, the width of the third insulating strip is not greater than the width of the seventh edge region;

[0020] And / or, along the first direction, the width of the fourth insulating strip is not greater than the width of the sixth edge region.

[0021] Optionally, the composite positive electrode includes a solid electrolyte layer, the composite negative electrode does not include a solid electrolyte layer, the composite positive electrode includes a positive current collector, positive active material layers located on both sides of the positive current collector along the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the positive active material layers along the thickness direction of the all-solid-state battery, and the positive electrode tab is formed by extending from the positive current collector.

[0022] Optionally, the composite positive electrode does not include a solid electrolyte layer, and the composite negative electrode includes a solid electrolyte layer. The composite negative electrode includes a negative current collector, negative active material layers located on both sides of the negative current collector along the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the negative active material layers along the thickness direction of the all-solid-state battery. The negative electrode tab is formed by extending from the negative current collector.

[0023] Optionally, both the composite positive electrode and the composite negative electrode include a solid electrolyte layer. The composite positive electrode includes a positive current collector, positive active material layers located on both sides of the positive current collector along the thickness direction of the all-solid-state battery, and solid electrolyte layers located on both sides of the positive active material layers along the thickness direction of the all-solid-state battery. The positive electrode tab is formed by extending from the positive current collector. The composite negative electrode includes a negative current collector, negative active material layers located on both sides of the negative current collector along the thickness direction of the all-solid-state battery, and solid electrolyte layers located on both sides of the negative active material layers along the thickness direction of the all-solid-state battery. The negative electrode tab is formed by extending from the negative current collector.

[0024] Optionally, the insulating strip is formed by curing insulating adhesive or by applying adhesive using a dispensing device.

[0025] Compared with existing technologies, the all-solid-state battery provided by this invention achieves at least the following beneficial effects:

[0026] In this invention, the composite positive electrode sheet and the composite negative electrode sheet are stacked and aligned, then staggered along a second direction. The composite negative electrode sheet and the composite positive electrode sheet serve as the first insulating strip and its carrier, respectively. Along the thickness direction of the all-solid-state battery, the first insulating strip is located within the fourth edge region of the negative electrode body of the composite negative electrode sheet, thus using the composite negative electrode sheet as the carrier of the first insulating strip. The first insulating strip is disposed in the same layer as the positive electrode body and wraps around the second side of the positive electrode body. And / or, along the thickness direction of the all-solid-state battery, the second insulating strip is located within the first edge region, thus using the first edge region of the positive electrode body of the composite positive electrode sheet as the carrier of the second insulating strip. The second insulating strip is disposed in the same layer as the negative electrode body and wraps around the third side, thereby insulating and wrapping the sides of the composite positive electrode sheet and the composite negative electrode sheet to prevent short circuits between the positive and negative electrodes during densification.

[0027] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0028] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0030] Figure 1 This is a schematic diagram of the structure of an all-solid-state battery provided by the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a battery cell unit provided by the present invention;

[0032] Figure 3 This is a schematic diagram of a planar structure of a battery cell unit provided by the present invention;

[0033] Figure 4 yes Figure 3 A cross-sectional view along line A-A' in the middle;

[0034] Figure 5 yes Figure 3 A cross-sectional view along the B-B' direction;

[0035] Figure 6 yes Figure 3 A cross-sectional view along the C-C' direction;

[0036] Figure 7 yes Figure 3 Another cross-sectional view along the A-A' direction;

[0037] Figure 8 yes Figure 3Another cross-sectional view along the B-B' direction;

[0038] Figure 9 yes Figure 3 Another cross-sectional view along the C-C' direction;

[0039] Figure 10 yes Figure 3 Another cross-sectional view along the A-A' direction;

[0040] Figure 11 yes Figure 3 Another cross-sectional view along the B-B' direction;

[0041] Figure 12 yes Figure 3 Another cross-sectional view along the C-C' direction;

[0042] Figure 13 This is a schematic diagram of a planar structure of another battery cell unit provided by the present invention;

[0043] Figure 14 yes Figure 13 Another cross-sectional view along the D-D' direction;

[0044] Figure 15 yes Figure 13 Another cross-sectional view along the E-E' direction;

[0045] Figure 16 yes Figure 13 Another cross-sectional view along the F-F' direction. Detailed Implementation

[0046] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0047] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0049] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0051] Reference Figures 1 to 4 , Figure 6 , Figure 9 and Figure 12 This embodiment provides an all-solid-state battery 1000, including a stacked cell unit 100. The cell unit 100 includes a stacked composite positive electrode 1 and a composite negative electrode 2, wherein at least one of the composite positive electrode 1 and the composite negative electrode 2 includes a solid electrolyte layer 5.

[0052] The positive electrode tab 11 of the composite positive electrode 1 and the negative electrode tab 21 of the composite negative electrode 2 are arranged opposite each other along the first direction X;

[0053] The positive electrode body 10 of the composite positive electrode 1 includes a first edge region 101 and a second side 102 disposed opposite to each other along the second direction Y. The negative electrode body 20 of the composite negative electrode 2 includes a third side 201 and a fourth edge region 202 disposed opposite to each other along the second direction Y. The second direction Y intersects with the first direction X. Along the thickness direction Z of the all-solid-state battery, the third side 201 is located within the first edge region 101, and the second side 102 is located within the fourth edge region 202.

[0054] It also includes an insulating strip, which includes a first insulating strip 31 and a second insulating strip 32. The first insulating strip 31 is disposed in the same layer as the positive electrode body 10 and wraps around the second side 102. Along the thickness direction Z of the all-solid-state battery, the first insulating strip 31 is located in the fourth edge region 202, and / or, the second insulating strip 32 is disposed in the same layer as the negative electrode body 20 and wraps around the third side 201. Along the thickness direction Z of the all-solid-state battery, the second insulating strip 32 is located in the first edge region 101.

[0055] Specifically, the all-solid-state battery 1000 of this embodiment has multiple stacked cell units 100. The number of cell units 100 is not specifically limited here. Each cell unit 100 consists of a positive and a negative electrode, including a stacked composite positive electrode 1 and a composite negative electrode 2. The composite positive electrode 1 and / or the composite negative electrode 2 have a solid electrolyte layer 5. The material of the solid electrolyte layer is not specifically limited here; materials from existing technologies can be used as the solid electrolyte. In this embodiment, refer to… Figure 6 The illustration will only take the composite positive electrode 1 with a solid electrolyte layer 5 as an example. Figure 9 The illustration is based solely on the example of the composite negative electrode 2 having a solid electrolyte layer 5; Figure 12 The following is an illustrative example, using the case where both the composite positive electrode 1 and the composite negative electrode 2 have a solid electrolyte layer 5.

[0056] like Figure 4 As shown, the positive electrode tab 11 of the composite positive electrode 1 and the negative electrode tab 21 of the composite negative electrode 2 are arranged opposite each other along the first direction X. The positive electrode tab 11 and the negative electrode tab 21 are metal conductors in the battery that lead out the positive and negative electrodes and are used as contact points during charging and discharging.

[0057] Combination Figure 3 , Figure 6 , Figure 9 and Figure 12 The positive electrode body 10 of the composite positive electrode 1 includes a first edge region 101 and a second side 102 disposed opposite to each other along the second direction Y. The negative electrode body 20 of the composite negative electrode 2 includes a third side 201 and a fourth edge region 202 disposed opposite to each other along the second direction Y. The second direction Y intersects the first direction X. Along the thickness direction Z of the all-solid-state battery, the third side 201 is located within the first edge region 101, and the second side 102 is located within the fourth edge region 202. The second side 102 is the long side of the composite positive electrode 1, and the third side 201 is the long side of the composite negative electrode 2. The first edge region 101 and the fourth edge region 202 are used as carriers for the second insulating strip 32 and the first insulating strip 31, respectively. During manufacturing, the composite positive electrode 1 and the composite negative electrode 2 can be pulled apart by a certain distance along the second direction Y. Thus, along the thickness direction Z of the all-solid-state battery, the positive electrode body 10 of the composite positive electrode 1 and the negative electrode body 20 of the composite negative electrode 2 have non-overlapping parts, namely the first edge region 101 and the fourth edge region 202, respectively. The first insulating strip 31 is set on the side of the fourth edge region 202 near the composite positive electrode 1, so that the first insulating strip 31 is in the same layer as the positive electrode body 10, wrapping the second side 102 of the positive electrode body 10 and insulating the second side 102. The second insulating strip 32 is set on the side of the first edge region 101 near the composite negative electrode 2, so that the second insulating strip 32 is in the same layer as the negative electrode body 20, wrapping the third side 201 of the negative electrode body 20 and insulating the third side 201. This achieves insulation of the second side 102 and the third side 201, preventing short circuits between the positive and negative poles.

[0058] Of course, since the outer edge of the first edge region 101 protrudes from the negative electrode body 20 and the fourth edge region 202 protrudes from the positive electrode body 10, it will not cause a short circuit between the positive and negative electrodes. Therefore, the problem of short circuit between the positive and negative electrodes can be significantly improved.

[0059] Optionally, only the first insulating strip 31 or only the second insulating strip 32 can be set. Of course, both the first insulating strip 31 and the second insulating strip 32 can be set at the same time. All of these can improve the problem of short circuit between the positive and negative poles to varying degrees. Of course, setting both the first insulating strip 31 and the second insulating strip 32 at the same time will improve the effect of short circuit between the positive and negative poles.

[0060] It should be noted that in existing technologies, the current collector of the positive or negative electrode sheet is used as the carrier, and an insulating strip is set on the current collector to insulate the sides of the positive or negative active material layer. However, since the current collector is usually made of aluminum or copper, and its sides are not insulated, there is still a risk of short circuit between the positive and negative electrodes. The present invention uses the composite negative electrode sheet 2 and the composite positive electrode sheet 1 as the carriers of the first insulating strip 31 and the second insulating strip 32, respectively. This not only insulates the sides of the positive or negative active material layer, but also insulates the sides of the current collectors (positive current collector and negative current collector), which can further and significantly improve the problem of short circuit between the positive and negative electrodes.

[0061] Furthermore, in this invention, no insulating strip is provided at the positions of the positive electrode tab 11 and the negative electrode tab 21, so as not to affect the connection between the positive electrode tab 11 and the external circuit, or the connection between the negative electrode tab 21 and the external circuit.

[0062] The all-solid-state battery 1000 provided in this embodiment has at least the following advantages compared with the prior art:

[0063] In this invention, the composite positive electrode 1 and the composite negative electrode 2 are stacked and aligned, then staggered along the second direction Y. The composite negative electrode 2 and the composite positive electrode 1 serve as the carriers of the first insulating strip 31 and the first insulating strip 31, respectively. Along the thickness direction Z of the all-solid-state battery, the first insulating strip 31 is located within the fourth edge region 202 of the negative electrode body 20 of the composite negative electrode 2. Thus, the composite negative electrode 2 serves as the carrier of the first insulating strip 31. The first insulating strip 31 is disposed in the same layer as the positive electrode body 10 and wraps around it. The second insulating strip 32 is located within the first edge region 101 on the second side 102 of the positive electrode body 10 and / or along the thickness direction Z of the all-solid-state battery. Thus, the first edge region 101 of the positive electrode body 10 of the composite positive electrode sheet 1 serves as the carrier of the second insulating strip 32. The second insulating strip 32 is disposed in the same layer as the negative electrode body 20 and wraps the third side 201, thereby insulating and wrapping the sides of the composite positive electrode sheet 1 and the composite negative electrode sheet 2 to prevent short circuit between the positive and negative electrodes during the densification process.

[0064] In some alternative embodiments, reference continues to be made to... Figures 1 to 3 and reference Figures 4 to 12 The positive electrode body 10 of the composite positive electrode 1 also includes a fifth side 103 and a sixth edge region 104 disposed opposite to each other along the first direction X. The fifth side 103 is the opposite side of the positive electrode tab 11. The negative electrode body 20 of the composite negative electrode 2 includes a seventh edge region 203 and an eighth side 204 disposed opposite to each other along the first direction X. The eighth side 204 is the opposite side of the negative electrode tab 21. Along the thickness direction Z of the all-solid-state battery, the fifth side 103 is located within the seventh edge region 203, and the eighth side 204 is located within the sixth edge region 104.

[0065] The insulating strip also includes a third insulating strip 41 and a fourth insulating strip 42. The third insulating strip 41 is disposed in the same layer as the positive electrode body 10 and wraps around the fifth side 103. Along the thickness direction Z of the all-solid-state battery, the third insulating strip 41 is located within the seventh edge region 203. And / or, the fourth insulating strip 42 is disposed in the same layer as the negative electrode body 20 and wraps around the eighth side 204. Along the thickness direction Z of the all-solid-state battery, the fourth insulating strip 42 is located within the sixth edge region 104.

[0066] Specifically, the fifth side 103 is the short side of the positive electrode body 10 of the composite positive electrode 1, and the eighth side 204 is the short side of the negative electrode body 20 of the composite negative electrode 2. Figure 6 , Figure 9 and Figure 12 The long sidewalls of the positive electrode body 10 and the negative electrode body 20 are insulated and wrapped. In this embodiment, the short sidewalls of the positive electrode body 10 and the negative electrode body 20 are also insulated and wrapped.

[0067] The sixth edge region 104 and the seventh edge region 203 are used as carriers for the second insulating strip 32 and the first insulating strip 31, respectively. During manufacturing, the composite positive electrode 1 and the composite negative electrode 2 can be pulled apart by a certain distance along the first direction X. Thus, along the thickness direction Z of the all-solid-state battery, the positive electrode body 10 of the composite positive electrode 1 and the negative electrode body 20 of the composite negative electrode 2 have non-overlapping parts, namely the sixth edge region 104 and the seventh edge region 203, respectively. A third insulating strip 41 is set on the side of the seventh edge region 203 near the composite positive electrode 1, so that the third insulating strip 41 is in the same layer as the positive electrode body 10, wrapping the fifth side 103 of the positive electrode body 10 and insulating the fifth side 103. A fourth insulating strip 42 is set on the side of the sixth edge region 104 near the composite negative electrode 2, so that the fourth insulating strip 42 is in the same layer as the negative electrode body 20, wrapping the eighth side 204 of the negative electrode body 20 and insulating the eighth side 204. This achieves insulation of the fifth side 103 and the eighth side 204, preventing short circuits between the positive and negative poles.

[0068] Since the outer edge of the sixth edge region 104 protrudes from the negative electrode body 20 and the seventh edge region 203 protrudes from the positive electrode body 10, it will not cause a short circuit between the positive and negative electrodes, thus significantly improving the problem of short circuit between the positive and negative electrodes.

[0069] Optionally, only the third insulating strip 41 or only the fourth insulating strip 42 can be set. Of course, both the third insulating strip 41 and the fourth insulating strip 42 can be set at the same time. All of these can improve the problem of short circuit between the positive and negative poles to varying degrees. Of course, setting both the third insulating strip 41 and the fourth insulating strip 42 at the same time will improve the effect of short circuit between the positive and negative poles.

[0070] In existing technologies, the current collector of the positive or negative electrode sheet is used as a carrier, and an insulating strip is set on the current collector to insulate the sides of the positive or negative active material. However, since the current collector is usually made of aluminum or copper, and its sides are not insulated, there is still a risk of short circuit between the positive and negative electrodes. This invention uses a composite negative electrode sheet 2 and a composite positive electrode sheet 1 as carriers for the third insulating strip 41 and the fourth insulating strip 42, respectively. This not only insulates the short sides of the positive or negative active material but also insulates the short sides of the current collector, significantly improving the problem of short circuit between the positive and negative electrodes.

[0071] In this embodiment, insulating strips are provided on the long side and short side of the positive electrode body 10 of the composite positive electrode 1, and on the long side and short side of the negative electrode body 20 of the composite negative electrode 2, thereby further improving the problem of short circuit between the positive and negative electrodes.

[0072] In some alternative embodiments, reference continues to be made to... Figure 6 , Figure 9 and Figure 12 Along the thickness direction Z of the all-solid-state battery, the thickness of the first insulating strip 31 is equal to the thickness of the positive electrode body 10.

[0073] And / or, along the thickness direction Z of the all-solid-state battery, the thickness of the second insulating strip 32 is equal to the thickness of the negative electrode body 20.

[0074] Understandably, the first insulating strip 31 wraps around the second side 102 of the positive electrode body 10 to insulate the second side 102, and the second insulating strip 32 wraps around the third side 201 of the negative electrode body 20 to insulate the third side 201. If the thickness of the first insulating strip 31 is less than the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, there is a risk of short circuit between the positive and negative electrodes because the second side 102 is not completely wrapped. If the thickness of the first insulating strip 31 is much greater than the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, it will increase the thickness of the all-solid-state battery 1000 and the surface unevenness. In this embodiment, the thickness of the first insulating strip 31 is equal to the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, which can reduce the risk of short circuit between the positive and negative electrodes without increasing the thickness of the all-solid-state battery 1000. Optionally, before densification, the thickness of the first insulating strip 31 can be slightly greater than the thickness of the positive electrode body 10. After densification, the thickness of the first insulating strip 31 is consistent with the thickness of the positive electrode body 10.

[0075] Similarly, if the thickness of the second insulating strip 32 is less than the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, there is a risk of short circuit between the positive and negative electrodes because the third side 201 is not completely wrapped. If the thickness of the second insulating strip 32 is much greater than the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, it will increase the thickness of the all-solid-state battery 1000 and cause surface unevenness. In this embodiment, the thickness of the second insulating strip 32 is equal to the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, which can reduce the risk of short circuit between the positive and negative electrodes without increasing the thickness of the all-solid-state battery 1000. Optionally, before densification, the thickness of the second insulating strip 32 can be slightly greater than the thickness of the negative electrode body 20. After densification, the thickness of the second insulating strip 32 is consistent with the thickness of the negative electrode body 20.

[0076] In some alternative embodiments, reference continues to be made to... Figure 3 , Figure 6 , Figure 9 , Figure 12 and reference Figure 13 and Figure 16 Along the second direction Y, the width of the first insulating strip 31 is not greater than the width of the fourth edge region 202;

[0077] And / or, along the second direction Y, the width of the second insulating strip 32 is not greater than the width of the first edge region 101.

[0078] Specifically, along the second direction Y, the width of the first insulating strip 31 is less than or equal to the width of the fourth edge region 202.

[0079] Figure 3 , Figure 6 , Figure 9 and Figure 12 In the middle, along the second direction Y, the width of the first insulating strip 31 is smaller than the width of the fourth edge region 202. Figure 13 and Figure 16 In the second direction Y, the width of the first insulating strip 31 is equal to the width of the fourth edge region 202. It is understood that the fourth edge region 202, as the carrier of the first insulating strip 31, needs its width along the second direction Y to be greater than or equal to the width of the first insulating strip 31 in order to support it. When the width of the first insulating strip 31 along the second direction Y is equal to the width of the fourth edge region 202, the empty area of ​​the fourth edge region 202 can be reduced, thus avoiding wasted space.

[0080] Figure 3 , Figure 6 , Figure 9 and Figure 12 In the middle, along the second direction Y, the width of the second insulating strip 32 is smaller than the width of the first edge region 101. Figure 13 and Figure 16 In the second direction Y, the width of the second insulating strip 32 is equal to the width of the first edge region 101. It is understood that the first edge region 101, as the carrier of the second insulating strip 32, needs a width in the second direction Y that is greater than or equal to the width of the second insulating strip 32 in order to support it. When the width of the second insulating strip 32 in the second direction Y is equal to the width of the first edge region 101, the empty area of ​​the first edge region 101 can be reduced, thus avoiding wasted space.

[0081] In some alternative embodiments, reference continues to be made to... Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 , Figure 11 as well as Figure 14 and Figure 15 Along the thickness direction Z of the all-solid-state battery, the thickness of the third insulating strip 41 is equal to the thickness of the positive electrode body 10.

[0082] And / or, along the thickness direction Z of the all-solid-state battery, the thickness of the fourth insulating strip 42 is equal to the thickness of the negative electrode body 20.

[0083] Understandably, the third insulating strip 41 wraps around the fifth side 103 of the positive electrode body 10 to insulate the fifth side 103, and the fourth insulating strip 42 wraps around the eighth side 204 of the negative electrode body 20 to insulate the eighth side 204. If the thickness of the third insulating strip 41 is less than the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, there is a risk of short circuit between the positive and negative electrodes because the fifth side 103 is not completely wrapped. If the thickness of the third insulating strip 41 is much greater than the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, it will increase the thickness of the all-solid-state battery 1000 and the surface unevenness. In this embodiment, the thickness of the third insulating strip 41 is equal to the thickness of the positive electrode body 10 along the thickness direction Z of the all-solid-state battery, which can reduce the risk of short circuit between the positive and negative electrodes without increasing the thickness of the all-solid-state battery 1000. Optionally, before densification, the thickness of the third insulating strip 41 can be slightly greater than the thickness of the positive electrode body 10. After densification, the thickness of the third insulating strip 41 is consistent with the thickness of the positive electrode body 10.

[0084] Similarly, if the thickness of the fourth insulating strip 42 is less than the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, there is a risk of short circuit between the positive and negative electrodes because the eighth side 204 is not completely wrapped. If the thickness of the fourth insulating strip 42 is much greater than the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, it will increase the thickness of the all-solid-state battery 1000 and cause surface unevenness. In this embodiment, the thickness of the fourth insulating strip 42 is equal to the thickness of the negative electrode body 20 along the thickness direction Z of the all-solid-state battery, which can reduce the risk of short circuit between the positive and negative electrodes without increasing the thickness of the all-solid-state battery 1000. Optionally, before densification, the thickness of the fourth insulating strip 42 can be slightly greater than the thickness of the negative electrode body 20. After densification, the thickness of the fourth insulating strip 42 is consistent with the thickness of the negative electrode body 20.

[0085] In some alternative embodiments, reference continues to be made to... Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 , Figure 11 , Figure 13 , Figure 14 and Figure 15 Along the first direction X, the width of the third insulating strip 41 is not greater than the width of the seventh edge region 203;

[0086] And / or, along the first direction X, the width of the fourth insulating strip 42 is not greater than the width of the sixth edge region 104.

[0087] Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 and Figure 11 In the middle, along the first direction X, the width of the third insulating strip 41 is smaller than the width of the seventh edge region 203. Figure 13 , Figure 14 and Figure 15 In the first direction X, the width of the third insulating strip 41 is equal to the width of the seventh edge region 203. It is understandable that the seventh edge region 203, as the carrier of the third insulating strip 41, needs a width greater than or equal to the width of the third insulating strip 41 along the first direction X to support it. When the width of the third insulating strip 41 along the first direction X is equal to the width of the seventh edge region 203, the empty area of ​​the seventh edge region 203 can be reduced, thus avoiding wasted space.

[0088] Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 and Figure 11 In the middle, along the first direction X, the width of the fourth insulating strip 42 is smaller than the width of the sixth edge region 104. Figure 13 , Figure 14 and Figure 15 In the first direction X, the width of the fourth insulating strip 42 is equal to the width of the sixth edge region 104. It is understood that the sixth edge region 104, as the carrier of the fourth insulating strip 42, needs a width greater than or equal to the width of the fourth insulating strip 42 along the first direction X to support it. When the width of the fourth insulating strip 42 along the first direction X is equal to the width of the sixth edge region 104, the empty area of ​​the sixth edge region 104 can be reduced, thus avoiding wasted space.

[0089] In some alternative embodiments, reference continues to be made to... Figures 4 to 6 The composite positive electrode 1 includes a solid electrolyte layer 5, while the composite negative electrode 2 does not include a solid electrolyte layer 5. The composite positive electrode 1 includes a positive current collector 12, a positive active material layer 13 located on both sides of the positive current collector 12 along the thickness direction Z of the all-solid-state battery, and a solid electrolyte layer 5 located on both sides of the positive active material layer 13 along the thickness direction Z of the all-solid-state battery. The positive electrode tab 11 is formed by extending from the positive current collector 12.

[0090] Specifically, in this embodiment, a solid electrolyte layer 5 is provided only in the composite positive electrode 1. The material of the solid electrolyte layer 5 can be oxide electrolyte, sulfide electrolyte, polymer electrolyte, or composite solid electrolyte, which are available in the prior art. No specific limitation is made here.

[0091] The positive current collector 12 can be aluminum foil, where aluminum has a high potential at the positive electrode (typically greater than 3.5V vs. Li). + Aluminum foil exhibits good stability under Li₂O₃ conditions, and the dense oxide film formed on its surface effectively prevents further corrosion. Aluminum foil is soft, meeting the flexibility requirements of battery electrode winding processes, and is abundant and inexpensive. Furthermore, aluminum's low density helps improve the battery's energy density. The positive electrode tab 11 extends from the positive electrode current collector 12, ensuring that current flows through the positive electrode tab 11 and connects to the external circuit. Positive electrode active materials can include ternary materials, conductive agents, sulfide electrolytes, binders, etc. Among them, ternary materials achieve high specific capacity (greater than 200 mAh / g) and structural stability through the synergistic effect of nickel, cobalt, and manganese (or aluminum). For example, NCM811 (80% nickel content) can significantly improve energy density. Conductive agents, as auxiliary materials, can be carbon black, carbon nanotubes, or graphene, which improve the electron transport efficiency of the active material by constructing a conductive network. Sulfide electrolytes (such as Li₂O₃, ... 10 GeP2S 12For solid-state battery electrolysis, the sulfide electrolyte is used to isolate the positive and negative electrodes and conduct lithium ions. It contacts the positive electrode active material through an interface layer, rather than being the active material itself. The chemical stability and electrochemical window of the sulfide electrolyte are key factors limiting the performance of solid-state batteries. Binders (such as PVDF, CMC+SBR) physically bind the active material, conductive agent, and current collector to ensure the integrity of the electrode structure.

[0092] The solid electrolyte layer 5 along the thickness direction Z of the all-solid-state battery is located on both sides of the positive electrode active material layer 13, thereby ensuring the multi-layer stacking of the composite positive electrode 1 and the composite negative electrode 2.

[0093] In some alternative embodiments, refer to Figures 7 to 9 The composite positive electrode 1 does not include the solid electrolyte layer 5, the composite negative electrode 2 includes the solid electrolyte layer 5, the composite negative electrode 2 includes a negative current collector 22, a negative active material layer 23 located on both sides of the negative current collector 22 along the thickness direction Z of the all-solid-state battery, and a solid electrolyte layer 5 located on both sides of the negative active material layer 23 along the thickness direction Z of the all-solid-state battery. The negative electrode tab 21 is formed by extending from the negative current collector 22.

[0094] In this embodiment, a solid electrolyte layer 5 is provided only in the composite negative electrode 2, and no solid electrolyte layer 5 is provided in the composite positive electrode 1. The material of the solid electrolyte layer 5 can be oxide electrolyte, sulfide electrolyte, polymer electrolyte and composite solid electrolyte in the prior art, and no specific limitation is made here.

[0095] The negative electrode current collector 22 can be copper foil, whose soft metallic properties perfectly meet the requirements. Copper is also an abundant resource. Furthermore, copper is relatively stable in air and reacts almost entirely in dry air. The negative electrode active material is made of carbon-based materials such as graphite, silicon, or a combination of both. Graphite has high conductivity, low cost, and a stable structure. Silicon negative electrodes can provide higher energy density. The negative electrode tab 21 is formed by extending the negative electrode current collector 22.

[0096] The solid electrolyte layer 5 along the thickness direction Z of the all-solid-state battery is located on both sides of the negative electrode active material layer 23, thereby ensuring the multi-layer stacking of the composite negative electrode 2 and the composite positive electrode 1.

[0097] In some alternative embodiments, reference continues to be made to... Figures 10 to 12 ,as well as Figures 14 to 16Both the composite positive electrode 1 and the composite negative electrode 2 include a solid electrolyte layer 5. The composite positive electrode 1 includes a positive current collector 12, a positive active material layer 13 located on both sides of the positive current collector 12 along the thickness direction Z of the all-solid-state battery, and a solid electrolyte layer 5 located on both sides of the positive active material layer 13 along the thickness direction Z of the all-solid-state battery. The positive electrode tab 11 is formed by extending from the positive current collector 12. The composite negative electrode 2 includes a negative current collector 22, a negative active material layer 23 located on both sides of the negative current collector 22 along the thickness direction Z of the all-solid-state battery, and a solid electrolyte layer 5 located on both sides of the negative active material layer 23 along the thickness direction Z of the all-solid-state battery. The negative electrode tab 21 is formed by extending from the negative current collector 22.

[0098] In this embodiment, a solid electrolyte layer 5 is provided in both the composite positive electrode 1 and the composite negative electrode 2. The materials of each film layer in the composite positive electrode 1 and the composite negative electrode 2 will not be described in detail here.

[0099] It is understandable that there may be defects due to the process when coating a single-layer solid electrolyte layer 5. In this embodiment, both the composite positive electrode 1 and the composite negative electrode 2 have a solid electrolyte layer 5, which can make up for the defects of the single-layer solid electrolyte layer 5 caused by the manufacturing process and improve the reliability of the battery.

[0100] In some alternative embodiments, the insulating strip is formed by curing insulating adhesive or by applying adhesive using a dispensing device.

[0101] The insulating strips in this invention, such as the first insulating strip 31, the second insulating strip 32, the third insulating strip 41 and the fourth insulating strip 42, can be adhesive strips cured with various types of insulating adhesive. They can be pre-made adhesive strips and then laid on the edges of the positive electrode body and the negative electrode body, or they can be directly applied to the edges of the positive electrode body and the negative electrode body in the stacked state using a dotting adhesive device.

[0102] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. An all-solid battery, characterized by, The full solid-state battery comprises a cell unit arranged in a stack, the cell unit comprising a composite positive sheet and a composite negative sheet arranged in a stack, at least one of the composite positive sheet and the composite negative sheet comprising a solid electrolyte layer, wherein a positive tab of the composite positive sheet and a negative tab of the composite negative sheet are arranged opposite to each other in a first direction; a positive body of the composite positive sheet comprises a first edge region and a second side edge arranged opposite to each other in a second direction, and a negative body of the composite negative sheet comprises a third side edge and a fourth edge region arranged opposite to each other in the second direction, the second direction intersecting the first direction, the third side edge being located within the first edge region and the second side edge being located within the fourth edge region in a thickness direction of the full solid-state battery; further comprising an insulating strip, the insulating strip comprising a first insulating strip and a second insulating strip, the first insulating strip being arranged in a same layer as the positive body and wrapping the second side edge, the first insulating strip being located within the fourth edge region in the thickness direction of the full solid-state battery, and / or the second insulating strip being arranged in a same layer as the negative body and wrapping the third side edge, the second insulating strip being located within the first edge region in the thickness direction of the full solid-state battery.

2. The all-solid battery according to claim 1, characterized by, the positive body of the composite positive sheet further comprises a fifth side edge and a sixth edge region arranged opposite to each other in the first direction, the fifth side edge being an opposite side edge of the positive tab, and the negative body of the composite negative sheet comprises a seventh edge region and an eighth side edge arranged opposite to each other in the first direction, the eighth side edge being an opposite side edge of the negative tab, the fifth side edge being located within the seventh edge region and the eighth side edge being located within the sixth edge region in the thickness direction of the full solid-state battery; the insulating strip further comprises a third insulating strip and a fourth insulating strip, the third insulating strip being arranged in a same layer as the positive body and wrapping the fifth side edge, the third insulating strip being located within the seventh edge region in the thickness direction of the full solid-state battery, and / or the fourth insulating strip being arranged in a same layer as the negative body and wrapping the eighth side edge, the fourth insulating strip being located within the sixth edge region in the thickness direction of the full solid-state battery.

3. The all-solid battery according to claim 1, characterized by, a thickness of the first insulating strip is equal to a thickness of the positive body in the thickness direction of the full solid-state battery; and / or a thickness of the second insulating strip is equal to a thickness of the negative body in the thickness direction of the full solid-state battery.

4. The all-solid battery according to claim 1, characterized by, a width of the first insulating strip is not greater than a width of the fourth edge region in the second direction; and / or a width of the second insulating strip is not greater than a width of the first edge region in the second direction.

5. The all-solid battery according to claim 2, characterized by, a thickness of the third insulating strip is equal to a thickness of the positive body in the thickness direction of the full solid-state battery; and / or a thickness of the fourth insulating strip is equal to a thickness of the negative body in the thickness direction of the full solid-state battery.

6. The all-solid battery according to claim 2, characterized by, a width of the third insulating strip is not greater than a width of the seventh edge region in the first direction; And / or, in the first direction, the fourth insulating strip has a width that is not greater than a width of the sixth edge region.

7. The all-solid battery according to claim 1 or 2, characterized by, The composite positive electrode sheet includes a solid electrolyte layer, the composite negative electrode sheet does not include a solid electrolyte layer, the composite positive electrode sheet includes a positive electrode current collector, a positive electrode active material layer located on both sides of the positive electrode current collector in the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the positive electrode active material layer in the thickness direction of the all-solid-state battery, and the positive electrode tab is formed by extending the positive electrode current collector.

8. The all-solid battery according to claim 1 or 2, characterized by, The composite positive electrode sheet does not include a solid electrolyte layer, the composite negative electrode sheet includes a solid electrolyte layer, the composite negative electrode sheet includes a negative electrode current collector, a negative electrode active material layer located on both sides of the negative electrode current collector in the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the negative electrode active material layer in the thickness direction of the all-solid-state battery, and the negative electrode tab is formed by extending the negative electrode current collector.

9. The all-solid battery according to claim 1 or 2, characterized by, The composite positive electrode sheet and the composite negative electrode sheet both include a solid electrolyte layer, the composite positive electrode sheet includes a positive electrode current collector, a positive electrode active material layer located on both sides of the positive electrode current collector in the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the positive electrode active material layer in the thickness direction of the all-solid-state battery, and the positive electrode tab is formed by extending the positive electrode current collector; and the composite negative electrode sheet includes a negative electrode current collector, a negative electrode active material layer located on both sides of the negative electrode current collector in the thickness direction of the all-solid-state battery, and the solid electrolyte layer located on both sides of the negative electrode active material layer in the thickness direction of the all-solid-state battery, and the negative electrode tab is formed by extending the negative electrode current collector.

10. The all-solid battery according to claim 1 or 2, characterized by, The insulating strip is formed by curing of insulating glue or is formed by spot coating of a spot coating glue device.

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