Battery device and electric device

Abstract

The present application provides a battery device and an electric device. The battery device comprises a box body and a plurality of battery assemblies; the plurality of battery assemblies are accommodated in the box body; each battery assembly comprises a housing and a plurality of solid-state batteries; the housing is provided with a first output portion and a second output portion having opposite polarities; the first output portion and the second output portion are both electrically connected to the solid-state batteries; the plurality of solid-state batteries are accommodated in a sealed space of the housing. The present application can reduce the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries, thereby improving the reliability and use reliability of the battery device; compared with a battery device in which the housing is omitted and the solid-state batteries are directly accommodated in the box body, due to the presence of the housing, the box body in the present solution only needs to satisfy basic sealing requirements of the battery device, and the difficulty of forming the sealed space by the housing is lower than the difficulty of sealing the box body, thereby reducing the sealing difficulty of the battery device, and further reducing the production difficulty of the battery device.

Description

Battery devices and electrical appliances Technical Field

[0001] The application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Batteries are widely used in new energy vehicles, electronic devices, and other fields. As the demand for batteries increases, reducing the difficulty of battery production is beneficial for improving production efficiency and reducing production costs. Summary of the Invention

[0003] This application provides a battery device and an electrical device that can reduce the manufacturing difficulty of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, including a housing and a plurality of battery components, wherein the plurality of battery components are housed within the housing; wherein the battery components include a casing and a plurality of solid-state batteries, the casing having a first output portion and a second output portion with opposite polarities, the first output portion and the second output portion being electrically connected to the solid-state batteries, the casing having a sealed space, and the plurality of solid-state batteries being housed within the sealed space.

[0005] In the above technical solution, multiple solid-state batteries are housed within a sealed space of a casing to form a battery assembly. This assembly is then housed within a housing. By sealing the solid-state batteries within this sealed space, the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries is reduced, improving the reliability and usability of the battery device. Compared to eliminating the casing and directly housing the solid-state batteries within the housing, which requires upgrading the housing's sealing level to reduce the risk of leakage of harmful gases like hydrogen sulfide, the presence of the casing in this solution only requires meeting the basic sealing requirements of the battery device. Furthermore, forming a sealed space within the casing is less difficult than sealing the housing itself, thus reducing the overall sealing complexity and production difficulty of the battery device. Additionally, the housing further reduces the risk of leakage of harmful gases like hydrogen sulfide generated by the solid-state batteries into the external environment, further improving the reliability and usability of the battery device.

[0006] In some embodiments of the first aspect of this application, the battery device further includes a circuit board, a plurality of solid-state batteries being electrically connected to the circuit board, at least a portion of the circuit board being disposed within the sealed space; the first output portion includes a first body, the second output portion includes a second body, both the first body and the second body being disposed within the housing, the circuit board including a first lead and a second lead, the first lead and the second lead passing through the housing and respectively connected to the first body and the second body to form the first output portion and the second output portion, the first lead being sealed to the housing, and the second lead being sealed to the housing.

[0007] In the above technical solution, the first lead-out portion is sealed to the outer casing, and the second lead-out portion is sealed to the outer casing, which further improves the sealing performance of the outer casing and further reduces the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery leaking into the external environment, thereby further improving the reliability and usability of the battery device.

[0008] In some embodiments of the first aspect of this application, the circuit board further includes a data acquisition component for acquiring information from the solid-state battery. The data acquisition component includes a connection terminal for connecting to a component located outside the housing. The connection terminal passes through the housing and is sealed to the housing.

[0009] In the above technical solution, the connecting terminals pass through the outer casing, facilitating connection between the terminals and external components. The sealed connection between the connecting terminals and the outer casing reduces the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery leaking into the external environment from the connection point between the terminals and the casing, further improving the reliability and operational reliability of the battery device.

[0010] In some embodiments of the first aspect of this application, both the first body and the second body protrude from the outer surface of the outer shell, a first space is formed inside the first body, a second space is formed inside the second body, and the first lead-out portion and the second lead-out portion pass through the outer shell and are respectively inserted into the first space and the second space.

[0011] In the above technical solution, by having the first lead-out part and the second lead-out part pass through the outer shell and be inserted into the first space and the second space respectively, the first body and the second body can protect the first lead-out part and the second lead-out part, reducing the risk of the first lead-out part and the second lead-out part being damaged by external forces.

[0012] In some embodiments of the first aspect of this application, the first body has a first clearance portion, the first body is in communication with the first space, and the first body is configured to expose the first lead-out portion in the first space; the second body has a second clearance portion, the second clearance portion is in communication with the second space, and the second clearance portion is configured to expose the second lead-out portion in the second space.

[0013] In the above technical solution, by setting a first clearance portion for exposing the first lead-out portion on the first body and setting a second clearance portion for exposing the second lead-out portion on the second body, the first lead-out portion and the second lead-out portion can be directly connected to the external structure in the exposed area, or they can be connected to the first body and the second body, making it more convenient to connect the battery assembly to the external structure.

[0014] In some embodiments of the first aspect of this application, the first body is made of an insulating material, and the second body is made of an insulating material.

[0015] In the above technical solution, the first body is made of insulating material and the second body is made of insulating material, which can reduce the risk of internal short circuit in the battery device and improve the reliability of the battery device.

[0016] In some embodiments of the first aspect of this application, the solid-state battery has two tabs with opposite polarities; the circuit board further includes a board body and a plurality of conductive elements, the first lead-out portion, the second lead-out portion and the conductive elements are all disposed on the board body, two of the plurality of conductive elements are respectively connected to the first lead-out portion and the second lead-out portion, and one tab of one solid-state battery and one tab of another solid-state battery are each connected to one conductive element.

[0017] In the above technical solution, two of the multiple conductive elements are respectively connected to the first lead-out portion and the second lead-out portion, and two of the multiple conductive elements are respectively connected to the first lead-out portion and the second lead-out portion. One tab portion of one solid-state battery and one tab portion of another solid-state battery are both connected to a conductive element, which facilitates the series, parallel or mixed connection of multiple solid-state batteries, and also helps to improve the stability and reliability of the electrical connection of multiple solid-state batteries.

[0018] In some embodiments of the first aspect of this application, the solid-state battery and the conductive element are respectively located on opposite sides of the plate body; the plate body is provided with an insertion hole that penetrates both sides of the plate body in the thickness direction, and the electrode tab passes through the insertion hole and extends to the side of the conductive element away from the plate body, and is connected to the conductive element.

[0019] In the above technical solution, the solid-state battery and the conductive component are located on opposite sides of the board body, which can reduce the risk of short circuit in the battery module and improve the reliability of the battery device. By having the tabs pass through the insertion holes and extend to the side of the conductive component away from the board body, and connect with the conductive component, the path from the tabs to the conductive component is shortened. This not only facilitates the connection between the tabs and the conductive component, but also allows for a more compact arrangement of the circuit board and solid-state battery, making full use of the internal space of the casing and thus improving the energy density of the battery module.

[0020] In some embodiments of the first aspect of this application, the solid-state battery includes an electrode assembly that is not encapsulated and is directly housed within the housing. The electrode assembly includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked along a first direction, wherein at least a portion of the solid electrolyte layer is located between the positive electrode layer and the negative electrode layer along the first direction.

[0021] In the above technical solution, the solid-state battery includes an electrode assembly. The electrode assembly is not encapsulated and is directly housed in the casing. Therefore, the solid-state battery does not need to be packaged, which helps to reduce the size of the solid-state battery and thus helps to improve the energy density of the battery device.

[0022] In some embodiments of the first aspect of this application, the solid-state battery includes a package and an electrode assembly, the electrode assembly being housed within the package, the electrode assembly including a positive electrode layer, a solid electrolyte layer and a negative electrode layer stacked along a first direction, wherein at least a portion of the solid electrolyte layer is located between the positive electrode layer and the negative electrode layer along the first direction.

[0023] In the above technical solution, the solid-state battery includes a packaging component and an electrode assembly. The electrode assembly is housed within the packaging component, which reduces the risk of harmful substances such as hydrogen sulfide generated by the solid-state battery leaking into the external environment. The packaging component protects the electrode assembly, reducing the risk of damage to the electrode assembly from external structures and forces, and improving the solid-state battery's resistance to external forces.

[0024] In some embodiments of the first aspect of this application, the housing includes a first wall and a second wall disposed opposite to each other along the first direction, the first wall and the second wall being configured to cooperate in clamping a plurality of the solid-state batteries.

[0025] In the above technical solution, the positive electrode layer, solid electrolyte, and negative electrode layer are stacked along a first direction, with at least a portion of the solid electrolyte layer located between the positive and negative electrode layers. Multiple solid-state batteries are clamped together by first and second walls of the outer casing arranged opposite each other along the first direction. This allows the positive electrode layer, solid electrolyte, and negative electrode layer of the solid-state battery to adhere more tightly, enabling effective contact between them and improving the transport efficiency of ions and electrons. This, in turn, improves conductivity, energy density, and enhances the stability and reliability of the battery device. It also reduces volume changes of the solid-state battery during operation, thereby improving the stability and lifespan of the battery device. The clamping of multiple solid-state batteries by the first and second walls also facilitates full utilization of the space in the outer casing along the first direction, increasing the energy density of the battery assembly and thus the energy density of the battery device.

[0026] In some embodiments of the first aspect of this application, the housing further includes a third wall and a fourth wall opposite each other along a second direction, the third wall and the fourth wall being connected to the first wall and the second wall, the third wall and the fourth wall being configured to cooperate in clamping a plurality of the solid-state batteries; the dimensions of the housing along a third direction are the dimensions of the housing along a first direction, the dimensions of the housing along the third direction are the dimensions of the housing along a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] In the above technical solution, by clamping multiple solid-state batteries together with the third and fourth walls along the second direction, it is beneficial to improve the stability of the solid-state batteries located inside the casing in the second direction, and to make full use of the space of the casing in the second direction, thereby increasing the energy density of the battery assembly and thus the energy density of the battery device. Since the dimension of the casing along the third direction is larger than the dimension along the first direction, and the dimension of the casing along the third direction is larger than the dimension along the second direction, meaning the casing applies a clamping force to the solid-state batteries in the direction with the smaller dimension, it is beneficial that each solid-state battery is subjected to essentially the same clamping force.

[0028] In some embodiments of the first aspect of this application, the housing further includes a third wall and a fourth wall opposite each other along a second direction, the third wall connecting the first wall and the second wall to form a housing having a first opening in the second direction, and the fourth wall closing the first opening; the size of the housing along a third direction is greater than the size of the housing along the first direction, the size of the housing along the third direction is greater than the size of the housing along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0029] In the above technical solution, the third wall connects the first wall and the second wall to form a shell with a first opening in the second direction. The fourth wall closes the first opening, and the size of the shell in the third direction is greater than the size of the shell in the first direction. The size of the shell in the third direction is greater than the size of the shell in the second direction. Therefore, the solid-state battery can enter the shell through the first opening. The entry path of the solid-state battery is shorter, and the friction between the solid-state battery and the first and second walls is smaller, which reduces the difficulty of the solid-state battery entering the shell and facilitates the entry of the solid-state battery into the shell.

[0030] In some embodiments of the first aspect of this application, along the second direction, the fourth wall has a first abutting surface facing the third wall, and the ends of the first wall and the second wall facing away from the third wall abut against the first abutting surface. The first abutting surface is provided with a first abutting portion, and along the first direction, the two ends of the first abutting portion contact the first wall and the second wall respectively.

[0031] In the above technical solution, along the second direction, the two ends of the first abutment contact the first wall and the second wall respectively. The shell and the fourth wall can then be positioned by the first abutment, which guides the first and second walls to abut against the first abutment surface, facilitating the fit between the fourth wall and the shell. The ends of the first wall and the second wall that are opposite to the third wall both abut against the first abutment surface, allowing the first and second walls to mutually limit the fourth wall in the second direction, thus facilitating the connection between the first and fourth walls, and between the second and fourth walls.

[0032] In some embodiments of the first aspect of this application, the first wall, the second wall, and the third wall are integrally formed.

[0033] In the above technical solution, the first wall, the second wall and the third wall are integrally formed, which helps to improve the structural strength and sealing performance of the shell, and also reduces the number of walls that need to be connected to the shell, simplifying the production process of the battery device and reducing the production difficulty.

[0034] In some embodiments of the first aspect of this application, both the first wall and the second wall are welded to the fourth wall.

[0035] In the above technical solution, the first wall and the second wall are both welded to the fourth wall, so that the first wall and the fourth wall, and the second wall and the fourth wall have good connection stability. The first wall and the fourth wall, and the second wall and the fourth wall can also be sealed by welding. There is no need to set up other sealing structures. That is, welding can achieve a sealed connection between the first wall and the fourth wall, and between the second wall and the fourth wall, making the structure of the battery module simpler and easier to assemble.

[0036] In some embodiments of the first aspect of this application, the housing further includes a third wall and a fourth wall opposite each other along a second direction, the first wall connecting the third wall and the fourth wall to form a housing having a first opening in a first direction, and the second wall closing the first opening; wherein the size of the housing along a third direction is greater than the size of the housing along the first direction, the size of the housing along a third direction is greater than the size of the housing along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0037] In the above technical solution, a first wall connects the third and fourth walls to form a shell with a first opening in the first direction. The second wall closes the first opening, and the shell's dimension in the third direction is larger than its dimension in the first direction, and the shell's dimension in the third direction is larger than its dimension in the second direction. This allows the solid-state battery to enter the shell through the first opening, resulting in a shorter entry path and less friction between the solid-state battery and the third and fourth walls, thus reducing the difficulty of inserting the solid-state battery into the shell and facilitating its installation. When the second wall closes the first opening, the first and second walls together clamp multiple solid-state batteries, allowing the positive electrode layer, solid electrolyte, and negative electrode layer of the solid-state battery to adhere more tightly. This ensures effective contact between the positive electrode layer, solid electrolyte, and negative electrode layer, improving ion and electron transport efficiency, thereby increasing conductivity, energy density, and enhancing the stability and reliability of the battery device. It also reduces volume changes of the solid-state battery during operation, thus improving the stability and lifespan of the battery device. The cooperation of the first and second walls in clamping multiple solid-state batteries also helps to fully utilize the space in the shell in the first direction, increasing the energy density of the battery assembly and thus the energy density of the battery device.

[0038] In some embodiments of the first aspect of this application, along the first direction, the second wall has a second abutting surface facing the first wall, and the end of the third wall opposite to the first wall and the end of the fourth wall opposite to the first wall both abut against the second abutting surface. The second abutting surface is provided with a second abutting portion, and along the first direction, the two ends of the second abutting portion contact the third wall and the fourth wall respectively.

[0039] In the above technical solution, along the first direction, the two ends of the second abutment contact the third wall and the fourth wall respectively. The shell and the second wall can then be positioned by the second abutment, which guides the third and fourth walls to abut against the second abutment surface, facilitating the fit between the second wall and the shell. The ends of the third wall and the fourth wall facing away from the first wall both abut against the second abutment surface, allowing the third and fourth walls to mutually limit each other with the second wall in the first direction, thus facilitating the connection between the third and second walls, and between the fourth and second walls.

[0040] In some embodiments of the first aspect of this application, the first wall, the third wall, and the fourth wall are integrally formed.

[0041] In the above technical solution, the first wall, third wall and fourth wall are integrally formed, which helps to improve the structural strength and sealing performance of the shell, and also reduces the number of walls that need to be connected to the shell, simplifying the production process of the battery device and reducing the production difficulty.

[0042] In some embodiments of the first aspect of this application, both the third wall and the fourth wall are welded to the second wall.

[0043] In the above technical solution, the third and fourth walls are welded to the second wall, which makes the connection between the third and second walls, and between the fourth and second walls, good. The third and second walls, and between the fourth and second walls, can also be sealed by welding, eliminating the need for other sealing structures. Welding can achieve a sealed connection between the third and second walls, and between the fourth and second walls, making the battery assembly structure simpler and easier to assemble.

[0044] In some embodiments of the first aspect of this application, along a third direction, the housing has opposing second and third openings, and the housing further includes a fifth wall and a sixth wall, the fifth wall and the sixth wall respectively closing the second opening and the third opening; the first output portion and the second output portion are formed on the fifth wall; or, the first output portion and the second output portion are formed on the fifth wall and the sixth wall respectively, and the first direction, the second direction and the third direction are perpendicular to each other.

[0045] In the above technical solution, by forming the first output part and the second output part on the fifth wall in a third direction, or by forming the first output part and the second output part on the fifth wall and the sixth wall in a third direction, the wall part where the solid-state battery is clamped by external force has a different setting direction from the first output part and the second output part. This facilitates the electrical connection between the first output part and the second output part and the solid-state battery. Since the wall part where the solid-state battery is clamped by external force has a different setting direction from the first output part and the second output part, the risk of interference between the external clamping mechanism and the first output part and the second output part can be reduced.

[0046] In some embodiments of the first aspect of this application, the solid-state battery has a first tab and a second tab, the first tab and the second tab being located at the ends of the solid-state battery along a third direction, and the first tab and the second tab being respectively connected to the first output and the second output.

[0047] In the above technical solution, since the first tab and the second tab are located at the ends of the solid-state battery along a third direction, and the first output part and the second output part are located on the wall of the outer casing along a third direction, it is convenient for the first tab and the second tab to be connected to the first output part and the second output part.

[0048] In some embodiments of the first aspect of this application, at least one of the third wall and the fourth wall is the wall with the largest outer surface area of ​​the outer shell.

[0049] In some embodiments of the first aspect of this application, since the third wall and the fourth wall are arranged opposite to each other in the second direction, which is different from the stacking direction (first direction) of the positive electrode layer, solid electrolyte and negative electrode layer, and since at least one of the third wall and the fourth wall is the wall with the largest outer surface area of ​​the outer casing, the outer surface area of ​​the outer casing wall in the stacking direction of the positive electrode layer, solid electrolyte and negative electrode layer is smaller, which makes it easier to clamp the solid battery along the stacking direction of the positive electrode layer, solid electrolyte and negative electrode layer, so as to make the positive electrode layer, solid electrolyte and negative electrode layer fit more tightly.

[0050] In some embodiments of the first aspect of this application, the dimension of the housing along the second direction is smaller than the dimension of the housing along the first direction.

[0051] In the above technical solution, the size of the outer shell along the second direction is smaller than the size of the outer shell along the first direction, so more solid-state batteries can be arranged in the first direction. Since the first wall and the second wall cooperate to clamp multiple solid-state batteries in the first direction, more solid-state batteries can be arranged in the first direction, which is beneficial to improving the energy density of the battery device.

[0052] In some embodiments of the first aspect of this application, in each of the battery components, a plurality of the solid-state batteries are arranged along the first direction.

[0053] In the above technical solution, in each battery assembly, multiple solid-state batteries are arranged along a first direction, and the first wall and the second wall of the casing cooperate to clamp the multiple solid-state batteries in the first direction, so that the multiple solid-state batteries can be arranged more closely, making full use of the internal space of the casing, which is conducive to improving the energy density of the battery assembly, and thus improving the energy density of the battery device.

[0054] In some embodiments of the first aspect of this application, the electrode assembly includes a positive electrode and a negative electrode, the positive electrode and the negative electrode are stacked along the first direction, and a solid electrolyte layer is disposed between adjacent positive electrode and negative electrode; the positive electrode includes a positive current collector and a positive active material layer, and the positive active material layer is disposed on at least one side of the positive current collector; the negative electrode includes a negative current collector and a negative active material layer, and the negative active material layer is disposed on at least one side of the negative current collector, one positive active material layer forms one positive electrode layer, and one negative active material layer forms one negative electrode layer.

[0055] In the above technical solution, the positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer disposed on at least one side of the positive current collector. The negative electrode sheet includes a negative current collector and a negative active material layer, with the negative active material layer disposed on at least one side of the negative current collector. That is, both the positive and negative electrode sheets are single-polarity electrodes, which facilitates the manufacturing and forming of electrode components and reduces the risk of short circuits in solid-state batteries.

[0056] In some embodiments of the first aspect of this application, the electrode assembly includes a plurality of electrodes stacked along the first direction, with a solid electrolyte layer disposed between two adjacent electrodes; each electrode includes a composite current collector, a positive active material layer, and a negative active material layer; the composite current collector includes a first conductive layer, an insulating layer, and a second conductive layer stacked sequentially; the positive active material layer is disposed on a surface opposite to the insulating layer from the first conductive layer; the negative active material layer is disposed on a surface opposite to the insulating layer from the second conductive layer; the positive active material layer of one of two adjacent electrodes forms a positive electrode layer; and the negative active material layer of the other of two adjacent electrodes forms a negative electrode layer.

[0057] In the above technical solution, the electrode includes a composite current collector, a positive electrode active material layer, and a negative electrode active material layer. The composite current collector includes a first conductive layer, an insulating layer, and a second conductive layer stacked sequentially. The positive electrode active material layer is disposed on the surface opposite to the insulating layer of the first conductive layer, and the negative electrode active material layer is disposed on the surface opposite to the insulating layer of the second conductive layer. That is, the electrode is a bipolar electrode, which is beneficial to reducing the space occupied by the current collector in the solid-state battery, and beneficial to improving the energy density of the solid-state battery, thereby improving the energy density of the battery device.

[0058] In some embodiments of the first aspect of this application, the housing includes a first housing and a second housing, the first housing and the second housing together defining a space for accommodating a plurality of the battery components, the first housing having a first sealing surface, the second housing having a second sealing surface, and the first sealing surface and the second sealing surface being sealed together.

[0059] In the above technical solution, the first sealing surface of the first housing and the second sealing surface of the second housing are sealed together, thereby enabling the first housing and the second housing to jointly define the housing space for the battery assembly. This results in better sealing performance of the battery device, further reducing the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery leaking into the external environment, and improving the reliability of the battery device and the reliability of using the battery device.

[0060] In some embodiments of the first aspect of this application, the material of the housing includes one or more of aluminum and steel.

[0061] In the above technical solution, the outer casing is made of one or more materials, such as aluminum and steel, which gives the casing high mechanical strength and thus improves the battery assembly's ability to resist external forces.

[0062] In some embodiments of the first aspect of this application, the housing is further provided with a pressure relief component for relieving pressure inside the battery assembly.

[0063] In the above technical solution, the outer casing is equipped with a pressure relief component. By releasing the pressure inside the battery assembly through the pressure relief component, the risk of the battery assembly exploding, overheating, or catching fire can be reduced, which is beneficial to improving the reliability of the battery device.

[0064] In some embodiments of the first aspect of this application, the housing includes a fifth wall and a sixth wall opposite to each other, and the first output portion and the second output portion are disposed on the fifth wall; or, the first output portion and the second output portion are respectively formed on the fifth wall and the sixth wall; the pressure relief component is disposed on the fifth wall or the sixth wall.

[0065] In the above technical solution, the pressure relief component is located on the fifth or sixth wall. That is, the pressure relief component, the first output part and the second output part can be located on the same side of the outer casing or on opposite sides of the outer casing. This reduces the influence of the external structure of the battery assembly on the pressure relief component to release the pressure inside the outer casing and improves the reliability of the battery device.

[0066] In some embodiments of the first aspect of this application, the battery assembly further includes a fixing part disposed on the housing and connected to the casing.

[0067] In the above technical solution, by setting a fixing part on the outer shell of the battery assembly and connecting the fixing part to the housing, the battery assembly and the housing are relatively fixed, thereby improving the stability of the battery assembly inside the housing.

[0068] In some embodiments of the first aspect of this application, a partition beam is provided inside the box, the partition beam being used to divide the internal space of the box into multiple sub-spaces, and the fixing part is connected to the partition beam.

[0069] In the above technical solution, the fixing part is connected to the partition beam, thereby indirectly realizing the connection between the box and the fixing part, which can reduce the impact on the strength of the box when the fixing part and the box are connected.

[0070] In some embodiments of the first aspect of this application, the housing is provided with a detection hole configured to allow detection gas to enter the housing; the battery assembly further includes a seal that seals the detection hole.

[0071] In the above technical solution, by providing a detection hole for the detection gas to enter the casing, it is convenient to inject the detection gas into the casing through the detection hole, thereby conducting airtightness testing on the casing. This makes airtightness testing of the battery assembly more convenient and provides a basis for improving the casing's sealing performance. The sealing element seals the detection hole, improving the sealing performance of the battery assembly.

[0072] Secondly, embodiments of this application provide an electrical device, including the battery device provided in any one of the embodiments of the first aspect.

[0073] In the above technical solutions, the battery device provided in any embodiment of the first aspect has better reliability, which is beneficial to improving the power reliability of electrical equipment powered by the battery device. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0076] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0077] Figure 3 is an isometric view of a battery assembly provided in some embodiments of this application;

[0078] Figure 4 is an exploded view of a battery assembly provided in some embodiments of this application;

[0079] Figure 5 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0080] Figure 6 is a schematic diagram of the structure of a solid-state battery provided in some embodiments of this application;

[0081] Figure 7 is a schematic diagram of the circuit board structure provided in some embodiments of this application;

[0082] Figure 8 is a schematic diagram of the cooperation between the first output section and the first lead-out section provided in some embodiments of this application;

[0083] Figure 9 is a schematic diagram of the cooperation between the first output section and the second lead-out section provided in some embodiments of this application;

[0084] Figure 10 is an enlarged view of point A in Figure 7;

[0085] Figure 11 is a cross-sectional view of the housing provided in some embodiments of this application;

[0086] Figure 12 is a schematic diagram of the structure of the fourth wall provided in some embodiments of this application;

[0087] Figure 13 is an enlarged view of point A1 in Figure 11;

[0088] Figure 14 is an enlarged view of point A2 in Figure 11;

[0089] Figure 15 is a cross-sectional view of the housing provided in some other embodiments of this application;

[0090] Figure 16 is an enlarged view of section A3 in Figure 15;

[0091] Figure 17 is an enlarged view of section A4 in Figure 15;

[0092] Figure 18 is a cross-sectional view of the housing provided in some embodiments of this application after the first and second walls are both welded to the fourth wall;

[0093] Figure 19 is an enlarged view of section A5 in Figure 18;

[0094] Figure 20 is an enlarged view of section A6 in Figure 18;

[0095] Figure 21 is a cross-sectional view of the housing provided in some other embodiments of this application after the first and second walls are both welded to the fourth wall;

[0096] Figure 22 is an enlarged view of section A7 in Figure 21;

[0097] Figure 23) is an enlarged view of point A8 in Figure 21;

[0098] Figure 24 is a schematic diagram of the structure of a battery assembly provided in some other embodiments of this application;

[0099] Figure 25 is an exploded view of a battery assembly provided in some other embodiments of this application;

[0100] Figure 26 is a cross-sectional view of the housing provided in some embodiments of this application;

[0101] Figure 27 is a schematic diagram of the structure of the second wall provided in some embodiments of this application;

[0102] Figure 28 is an enlarged view of point B1 in Figure 26;

[0103] Figure 29 is an enlarged view of point B2 in Figure 26;

[0104] Figure 30 is a cross-sectional view of the housing provided in some other embodiments of this application;

[0105] Figure 31 is an enlarged view of point B3 in Figure 30;

[0106] Figure 32 is an enlarged view of section B4 in Figure 30;

[0107] Figure 33 is a cross-sectional view of the housing after the third and fourth walls are welded to the second wall in some embodiments of this application;

[0108] Figure 34 is an enlarged view of point B5 in Figure 33;

[0109] Figure 35 is an enlarged view of point B6 in Figure 33;

[0110] Figure 36 is a cross-sectional view of the third and fourth walls of the housing provided in some embodiments of this application after welding with the second wall;

[0111] Figure 37 is an enlarged view of point B7 in Figure 36;

[0112] Figure 38 is an enlarged view of point B8 in Figure 36;

[0113] Figure 39 is a schematic diagram of the structure of an electrode assembly provided in some other embodiments of this application;

[0114] Figure 40 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0115] Figure 41 is a cross-sectional view of a battery device provided in some embodiments;

[0116] Figure 42 is an enlarged view of point B in Figure 4.

[0117] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing; 111 - First sealing surface; 112 - First cavity; 113 - First main body; 114 - First flange; 12 - Second housing; 121 - Second sealing surface; 122 - Second cavity; 123 - Second main body; 124 - Second flange; 20 - Battery assembly; 20a - First output section; 20b - Second output section; 21 - Housing; 21a - Housing; 211 - Sealed space; 212a - First socket; 212b - Second socket; 212c - Third socket; 213 - First wall; 2131 - First outer surface; 214 - ... Second wall; 2141-Second abutting surface; 2142-Second abutting portion; 2143-Second outer surface; 2144-Third end face; 2145-Fourth end face; 215-Third wall; 2151-Third outer surface; 216-Fourth wall; 2161-First abutting surface; 2162-First abutting portion; 2163-First end face; 2164-Second end face; 2165-Fourth outer surface; 217-Fifth wall; 218-Sixth wall; 219-Detection hole; 22-Solid-state battery; 221-Electrode assembly; 2211-Positive electrode layer; 2212-Solid electrolyte; 2213-Negative electrode layer; 2214-Positive electrode sheet; 22 141-Positive current collector; 22142-Positive active material layer; 2215-Negative electrode sheet; 22151-Negative current collector; 22152-Negative active material layer; 2216-Electrode sheet; 22161-Composite current collector; 221611-First conductive layer; 221612-Insulating layer; 221613-Second conductive layer; 222-Packaging; 223-Electrode tab; 223a-First electrode tab; 223b-Second electrode tab; 23-First body; 231-First space; 232-First clearance portion; 24-Second body; 241-Second space; 242-Second clearance portion; 25-Circuit board; 25 1-First lead-out section; 2511-First connecting section; 252-Second lead-out section; 2521-Second connecting section; 253-Board body; 2531-Intercepting hole; 254-First mounting section; 255-Second mounting section; 256-Collection assembly; 2561-Connecting terminal; 257-Third mounting section; 258-Conductive component; 26-Pressure relief component; 27-Fixing section; 28-Sealing component; 30-Separating beam; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction; Q1-First opening; Q2-Second opening; Q3-Third opening; P-Solder mark; M-Gap; N-Subspace. Detailed Implementation

[0118] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0119] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0120] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0121] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0122] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0123] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0124] In this application, "multiple" means two or more (including two).

[0125] In this embodiment of the application, the solid-state battery can be a secondary battery, which refers to a battery that can be used again after the solid-state battery has been discharged, by recharging to activate the active materials.

[0126] Solid-state batteries include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0127] Solid-state batteries typically consist of an electrode assembly, which includes a positive electrode, a negative electrode, and a solid electrolyte. During the charging and discharging process of a solid-state battery, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. At least a portion of the solid electrolyte is disposed between the positive and negative electrodes, which helps reduce the risk of short circuits between the electrodes while allowing active ions to pass through.

[0128] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0129] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0130] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0131] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for solid-state batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0132] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0133] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0134] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0135] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0136] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0137] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in solid-state batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for solid-state batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0138] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0139] Solid electrolytes are placed between the positive and negative electrodes, serving both to transport ions and isolate the positive and negative electrodes. Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0140] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0141] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0142] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0143] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0144] In some implementations, the electrode assembly is a stacked structure.

[0145] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0146] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0147] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0148] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0149] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0150] In some implementations, the solid-state battery may include a package. The package is used to encapsulate components such as electrode assemblies. The package may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0151] As an example, solid-state batteries can be cylindrical battery cells, prismatic battery cells, pouch battery cells, or other shaped battery cells. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0152] The battery apparatus mentioned in the embodiments of this application may include one or more battery modules for providing voltage and capacity. The battery module may include multiple solid-state batteries, which are connected in series, parallel, or mixed connections via a busbar.

[0153] In some embodiments, the battery assembly may be formed by arranging and fixing multiple solid-state batteries to form an independent module.

[0154] In some embodiments, the battery device may be a battery pack, which may include a housing and a plurality of battery components housed within the housing.

[0155] For example, the battery assembly can be housed in a housing by being fixed within the housing.

[0156] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the battery assembly. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0157] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the battery assembly.

[0158] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0159] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0160] Since solid-state batteries may produce harmful gases such as hydrogen sulfide during charging and discharging, battery devices that include multiple solid-state batteries need to be more strictly sealed to reduce the risk of these gases leaking into the external environment. However, upgrading the sealing level of the battery device makes it more difficult to seal, which increases the difficulty of manufacturing the battery device.

[0161] Based on the above considerations, in order to reduce the manufacturing difficulty of the battery device, this application provides a battery device, which includes a housing and multiple battery components, wherein the multiple battery components are housed in the housing; wherein, the battery components include a shell and multiple solid-state batteries, the shell has a first output part and a second output part with opposite polarities, both the first output part and the second output part are electrically connected to the solid-state batteries, the shell has a sealed space, and the multiple solid-state batteries are housed in the sealed space.

[0162] By housing multiple solid-state batteries within a sealed space in a casing to form a battery assembly, and then housing the battery assembly within a housing, the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries can be reduced, thus improving the reliability and usability of the battery device. Compared to battery devices that eliminate the casing and directly house the solid-state batteries within the housing, which require an upgraded sealing rating to reduce the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries to the outside, this solution only requires the housing to meet the basic sealing requirements of the battery device. Furthermore, forming a sealed space within the casing is less difficult than sealing the housing itself, thereby reducing the sealing complexity of the battery device and consequently reducing its manufacturing complexity. Additionally, the housing further reduces the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries to the external environment, further improving the reliability and usability of the battery device.

[0163] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0164] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0165] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0166] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0167] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0168] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 10 and a battery assembly 20, with the housing 10 used to house the battery assembly 20.

[0169] The housing 10 has an enclosed space inside for accommodating the battery assembly 20. The housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing 11 and a second housing 12, which are interlocked. The first housing 11 and the second housing 12 can have various shapes, such as cuboids or cylinders. The first housing 11 can be a hollow structure open on one side, and the second housing 12 can also be a hollow structure open on one side. The open side of the second housing 12 interlocks with the open side of the first housing 11, thus forming a housing 10 with an enclosed space. Alternatively, the first housing 11 can be a hollow structure open on one side, and the second housing 12 can be a plate-like structure, with the second housing 12 interlocked with the open side of the first housing 11, thus forming a housing 10 with an accommodating space.

[0170] In the battery device 100, there can be one or more battery components 20. If there are multiple battery components 20, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery components 20 are connected in both series and parallel. Alternatively, multiple battery components 20 can be connected in series, in parallel, or in a mixed manner to form a whole and housed within the housing 10.

[0171] In some embodiments, the battery device 100 may further include a busbar (not shown) through which multiple battery modules 20 can be electrically connected to each other, enabling series, parallel, or mixed connection of the multiple battery modules 20. The busbar can be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0172] As shown in Figures 2-4, this application provides a battery device 100, which includes a housing 10 and a plurality of battery components 20, which are housed within the housing 10. Each battery component 20 includes a housing 21 and a plurality of solid-state batteries 22. The housing 21 has a first output portion 20a and a second output portion 20b with opposite polarities. Both the first output portion 20a and the second output portion 20b are electrically connected to the solid-state batteries 22. The housing 21 has a sealed space 211, in which the plurality of solid-state batteries 22 are housed.

[0173] Multiple battery modules 20 can be connected in series, in parallel, or in a mixed configuration. The first output section 20a and the second output section 20b are structures that connect the battery module 20 to other components (such as a busbar component). For example, the first output section 20a and / or the second output section 20b are connected to the busbar component, thereby enabling multiple battery modules 20 to be connected in series, in parallel, or in a mixed configuration.

[0174] Solid-state battery 22 refers to a battery that includes a solid electrolyte 2212.

[0175] As shown in Figure 5, in some embodiments, the solid-state battery 22 can be an electrode assembly 221. The electrode assembly 221 includes a positive electrode layer 2211, a solid electrolyte layer 2212, and a negative electrode layer 2213 stacked along a first direction X. Along the first direction X, at least a portion of the solid electrolyte layer 2212 is located between the positive electrode layer 2211 and the negative electrode layer 2213. Both the positive electrode layer 2211 and the negative electrode layer 2213 are attached to the solid electrolyte layer 2212. The solid-state battery 22 also has a first tab 223a and a second tab 223b. The first tab 223a and the second tab 223b are electrically connected to the positive electrode layer 2211 and the negative electrode layer 2213, respectively, and are connected to the first output section 20a and the second output section 20b, respectively.

[0176] In other embodiments, referring to Figures 5 and 6, the solid-state battery 22 may include an electrode assembly 221 and a package 222, with the electrode assembly 221 housed within the package 222. The electrode assembly 221 includes a positive electrode layer 2211, a solid electrolyte layer 2212, and a negative electrode layer 2213 stacked along a first direction X. At least a portion of the solid electrolyte layer 2212 is located between the positive electrode layer 2211 and the negative electrode layer 2213 along the first direction X, and both the positive electrode layer 2211 and the negative electrode layer 2213 are in contact with the solid electrolyte layer 2212. The solid-state battery 22 also has a first tab 223a and a second tab 223b, which are electrically connected to the positive electrode layer 2211 and the negative electrode layer 2213, respectively. A portion of the first tab 223a and a portion of the second tab 223b extend out of the package 222 and are connected to a first output portion 20a and a second output portion 20b, respectively.

[0177] The positive electrode layer 2211 can be a positive electrode active material layer 22142, and the negative electrode layer 2213 can be a negative electrode active material layer 22152.

[0178] For the battery assembly 20, multiple solid-state batteries 22 are housed within the casing 21. The multiple solid-state batteries 22 can be connected in series, parallel, or in a mixed configuration. The casing 21 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing 21), or an aluminum-plastic film, etc.

[0179] By housing multiple solid-state batteries 22 within the sealed space 211 of the casing 21 to form a battery assembly 20, and then housing the battery assembly 20 within the housing 10, the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries 22 can be reduced by sealing the solid-state batteries 22 within the sealed space 211 of the casing 21, thereby improving the reliability and usability of the battery device 100. Furthermore, housing the battery assembly 20 within the housing 10, compared to eliminating the casing 21 and directly housing the solid-state batteries 22 within the housing 10, requires upgrading the sealing level of the housing 10 to reduce the risk of leakage of harmful gases such as hydrogen sulfide generated by the solid-state batteries 22 to the outside of the housing 10. Because of the existence of the casing 21, in this solution, the housing 10 only needs to meet the basic sealing requirements of the battery device 100, and the difficulty of forming the sealed space 211 of the casing 21 is less than the difficulty of sealing the housing 10, thus reducing the sealing difficulty of the battery device 100 and consequently reducing the manufacturing difficulty of the battery device 100. Furthermore, the enclosure 10 can further reduce the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery 22 leaking into the external environment, thereby further improving the reliability and usability of the battery device 100.

[0180] As shown in Figures 4 and 7, in some embodiments, the battery device 100 further includes a circuit board 25, with a plurality of solid-state batteries 22 electrically connected to the circuit board 25. At least a portion of the circuit board 25 is disposed within a sealed space 211. The first output section 20a includes a first body 23, and the second output section 20b includes a second body 24. Both the first body 23 and the second body 24 are disposed in the housing 21. The circuit board 25 includes a first lead-out section 251 and a second lead-out section 252. The first lead-out section 251 and the second lead-out section 252 pass through the housing 21 and are respectively connected to the first body 23 and the second body 24 to form the first output section 20a and the second output section 20b. The first lead-out section 251 is sealed to the housing 21, and the second lead-out section 252 is sealed to the housing 21.

[0181] In some embodiments, the first lead-out portion 251 passes through the housing 21 and extends out of the housing 21 to form a first output portion 20a, and the second lead-out portion 252 passes through the housing and extends out of the housing 21 to form a second output portion 20b.

[0182] There are various sealing methods for the first lead-out portion 251 and the outer casing 21, as well as for the second lead-out portion 252 and the outer casing 21. For example, as shown in FIG7, a first mounting portion 254 is provided around the outer periphery of the first lead-out portion 251. The first mounting portion 254 can accommodate a first sealing member, which can seal between the first guide portion and the hole wall of the first insertion hole. A second mounting portion 255 is provided around the outer periphery of the second lead-out portion 252. The second mounting portion 255 can accommodate a second sealing member, which can seal between the hole wall of the second guide portion and the second insertion hole.

[0183] The first lead-out portion 251 is sealed to the outer casing 21, and the second lead-out portion 252 is sealed to the outer casing 21, which further improves the sealing performance of the outer casing 21 and further reduces the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery 22 leaking into the external environment, thereby further improving the reliability and usability of the battery device 100.

[0184] In some embodiments, the circuit board 25 further includes a data acquisition component 256 for acquiring information from the solid-state battery 22. The data acquisition component 256 includes a connection terminal 2561 for connecting to a component located outside the housing 21. The connection terminal 2561 passes through the housing 21 and is sealed to the housing 21.

[0185] The acquisition component 256 also includes an acquisition unit (not shown in the figure), which acquires information from the solid-state battery 22, such as voltage and temperature information. The acquisition unit includes, but is not limited to, a temperature sensor and a voltage detection component.

[0186] The acquisition unit is electrically connected to the connection terminal 2561. The connection terminal 2561 can be a male connector, meaning it can be inserted into a component located outside the housing 21, thereby connecting the connection terminal 2561 to the component located outside the housing 21. The connection terminal 2561 can also be a female connector, meaning it can be inserted into a component located outside the housing 21, thereby connecting the connection terminal 2561 to the component located outside the housing 21.

[0187] The housing 21 is also provided with a third socket 212c, through which the connecting terminal 2561 passes through the housing 21.

[0188] There are various sealing methods for the connection terminal 2561 and the housing 21. For example, as shown in FIG7, a third mounting portion 257 is provided around the outer periphery of the connection terminal 2561. The third mounting portion 257 can accommodate a third seal, which seals the electrode terminal and the housing 21.

[0189] The connection terminal 2561 passes through the housing 21, facilitating connection between the connection terminal 2561 and components outside the housing 21. The sealed connection between the connection terminal 2561 and the housing 21 reduces the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery 22 leaking into the external environment from the connection point between the connection terminal 2561 and the housing 21, further improving the reliability and usability of the battery device 100.

[0190] The structure of the first body 23 and the second body 24 can take many forms, for example, as shown in Figures 3, 4, 8 and 9. In some embodiments, the first body 23 and the second body 24 both protrude from the outer surface of the outer shell 21. A first space 231 is formed inside the first body 23, and a second space 241 is formed inside the second body 24. The first lead-out portion 251 and the second lead-out portion 252 pass through the outer shell 21 and are respectively inserted into the first space 231 and the second space 241.

[0191] The outer casing 21 has a first socket 212a and a second socket 212b. A first space 231 is formed inside the first body 23, and a second space 241 is formed inside the second body 24. The first body 23 is connected to the outer casing 21 and covers the first socket 212a, so that the first socket 212a and the first space 231 are connected. The second body 24 is connected to the outer casing 21 and covers the second socket 212b, so that the second socket 212b and the second space 241 are connected. A first lead-out portion 251 passes through the first socket 212a, is inserted into the first space 231, and is connected to the first body 23. A second lead-out portion 252 passes through the second socket 212b, is inserted into the second space 241, and is connected to the second body 24.

[0192] The first lead-out portion 251 can be insulated from or electrically connected to the first body 23 within the first space 231; the second lead-out portion 252 can be insulated from or electrically connected to the second body 24 within the second space 241.

[0193] Both the first body 23 and the second body 24 protrude from the outer surface of the outer shell 21. If the first lead-out portion 251 is electrically connected to the first body 23 in the first space 231 and the second lead-out portion 252 is electrically connected to the second body 24 in the second space 241, the first body 23 and the second body 24 can be welded, bonded, or threaded to the busbar component to realize multiple battery modules 20 connected in series, in parallel, or in a mixed configuration.

[0194] If the first lead-out portion 251 is insulated from the first body 23 in the first space 231 and the second lead-out portion 252 is insulated from the second body 24 in the second space 241, then neither the first body 23 nor the second body 24 is electrically charged. At least a portion of the first lead-out portion 251 and at least a portion of the second lead-out portion 252 respectively form the first output portion 20a and the second output portion 20b.

[0195] If the first lead-out portion 251 is electrically connected to the first body 23 in the first space 231, and the second lead-out portion 252 is electrically connected to the second body 24 in the second space 241, then at least a portion of the first lead-out portion 251 and the first body 23 together form the first output portion 20a, and at least a portion of the second lead-out portion 252 and the second lead-out portion 252 together form the second output portion 20b.

[0196] The first body 23 and the outer shell 21 can be separate components that are then connected as a whole. The connection method between the first body 23 and the outer shell 21 is not limited, such as welding, bonding, threading, etc. The second body 24 and the outer shell 21 can also be separate components that are then connected as a whole. The connection method between the second body 24 and the outer shell 21 is not limited, such as welding, bonding, threading, etc.

[0197] Of course, the first body 23, the second body 24 and the outer shell 21 can also be integrally formed so that the first body 23 and the outer shell 21, and the second body 24 and the outer shell 21 have good connection strength and sealing performance.

[0198] By inserting the first lead-out portion 251 and the second lead-out portion 252 through the outer shell 21 into the first space 231 and the second space 241 respectively, the first body 23 and the second body 24 can protect the first lead-out portion 251 and the second lead-out portion 252, reducing the risk of the first lead-out portion 251 and the second lead-out portion 252 being damaged by external forces.

[0199] In some embodiments, referring to Figures 4, 8, and 9, the first body 23 has a first clearance portion 232 that communicates with the first space 231 and is configured to expose the first lead-out portion 251 within the first space 231. The second body 24 has a second clearance portion 242 that communicates with the second space 241 and is configured to expose the second lead-out portion 252 within the second space 241.

[0200] When the first body 23 and the first lead-out portion 251 are electrically connected, and the second body 24 and the second lead-out portion 252 are electrically connected, the busbar can be connected to both the first body 23 and the first lead-out portion 251, and the busbar can be connected to both the second body 24 and the second lead-out portion 252; of course, the busbar can also be connected only to the first body 23 and the second body 24, thereby realizing the electrical connection between the busbar and the battery assembly 20.

[0201] The busbar component can be selected with different structural forms depending on the different structures of the first body 23 and the second body 24. For example, if the first body 23 and the second body 24 are columnar structures, the busbar component can be a sheet structure, such as a copper bar. For another example, as shown in Figures 3 and 4, the first clearance portion 232 can be a first threaded hole, and the second clearance portion 242 can be a second threaded hole. The busbar component can be a double-ended screw that can threadedly engage with the first and second threaded holes. Then, the threads at both ends of the busbar component can respectively connect to the first threaded hole of one battery assembly 20 and the second threaded hole of the other battery assembly 20 to achieve series connection of the two battery assemblies 20; and / or, the threads at both ends of the busbar component can respectively connect to the first threaded hole of one battery assembly 20 and the first threaded hole of the other battery assembly 20 to achieve parallel connection of the two battery assemblies 20.

[0202] Of course, the first clearance part 232 and the second clearance part 242 can also be round holes.

[0203] By providing a first clearance portion 232 for exposing the first lead-out portion 251 on the first body 23 and a second clearance portion 242 for exposing the second lead-out portion 252 on the second body 24, the first lead-out portion 251 and the second lead-out portion 252 can be directly connected to the external structure in the exposed area, or they can be connected to the first body 23 and the second body 24, making it more convenient for the battery assembly 20 to be connected to the external structure.

[0204] In some embodiments, the first body 23 is made of an insulating material, and the second body 24 is made of an insulating material.

[0205] The first body 23 and the first lead 251 are insulated from each other, and the second body 24 and the second lead 252 are insulated from each other. The materials of the first body 23 and the second body 24 can be plastic, rubber, etc.

[0206] The first body 23 is made of insulating material, and the second body 24 is made of insulating material, which can reduce the risk of internal short circuit in the battery device 100 and improve the reliability of the battery device 100.

[0207] Of course, the materials of the first body 23 and the second body 24 can also be conductive materials, such as aluminum or copper. The first body 23 and the second body 24 are insulated from the outer casing 21.

[0208] As shown in Figures 7, 8 and 9, the first lead-out portion 251 has a first connecting portion 2511 at a position corresponding to the first avoidance portion 232, and the second lead-out portion 252 has a second connecting portion 2521 at a position corresponding to the second avoidance portion 242.

[0209] The first connecting part 2511 and the second connecting part 2521 are used to connect with the busbar component. The first connecting part 2511 and the second connecting part 2521 can be a threaded hole, a slot, or other structure.

[0210] Referring to Figures 4 and 7-9, in some embodiments, the solid-state battery 22 has two tabs 223 with opposite polarities; the circuit board 25 also includes a board body 253 and a plurality of conductive elements 258. The first lead-out portion 251, the second lead-out portion 252 and the conductive elements 258 are all disposed on the board body 253. Two of the plurality of conductive elements 258 are respectively connected to the first lead-out portion 251 and the second lead-out portion 252. One tab 223 of one solid-state battery 22 and one tab 223 of another solid-state battery 22 are each connected to a conductive element 258.

[0211] As shown in Figure 7, both the first lead-out portion 251 and the second lead-out portion 252 protrude from the surface of the plate body 253 in the thickness direction. The first lead-out portion 251, the second lead-out portion 252 and the conductive element 258 are disposed on the same side of the plate body 253 in the thickness direction.

[0212] There can be various ways to connect the first lead-out part 251 and the plate body 253. For example, the first lead-out part 251 and the plate body 253 can be connected by adhesive bonding, riveting, screwing, etc.

[0213] There can be various ways to connect the second lead-out part 252 and the plate body 253, such as adhesive connection, riveting connection, screw connection, etc.

[0214] There are various ways to connect the conductive component 258 and the board body 253. For example, the first lead-out part 251 and the board body 253 can be connected by adhesive bonding, riveting, screwing, etc.

[0215] The board body 253 can be made of insulating material.

[0216] Two of the multiple conductive elements 258 are respectively connected to the first lead-out portion 251 and the second lead-out portion 252. One tab portion 223 of one solid-state battery 22 and one tab portion 223 of another solid-state battery 22 are each connected to a conductive element 258. This facilitates the series, parallel, or mixed connection of multiple solid-state batteries 22 and improves the stability and reliability of the electrical connection between the multiple solid-state batteries 22. In other words, the multiple solid-state batteries 22 in the battery assembly 20 are connected in series, parallel, or mixed via multiple conductive elements 258. In some embodiments, the multiple conductive elements 258 are disposed on the plate body 253, and the acquisition unit can acquire information from the conductive elements 258 to obtain information about the solid-state batteries 22.

[0217] As shown in Figures 4 and 7-10, in some embodiments, the solid-state battery 22 and the conductive element 258 are located on opposite sides of the plate body 253, respectively. The plate body 253 is provided with an insertion hole 2531, which penetrates both sides of the plate body 253 in the thickness direction. The tab 223 passes through the insertion hole 2531 and extends to the side of the conductive element 258 away from the plate body 253, and is connected to the conductive element 258.

[0218] The tab 223 and the conductive part 258 can be connected by conductive adhesive, welding, etc.

[0219] The solid-state battery 22 and the conductive element 258 are located on opposite sides of the board body 253, which reduces the risk of short circuit in the battery assembly 20 and improves the reliability of the battery device 100. The tab 223 passes through the insertion hole 2531 and extends to the side of the conductive element 258 away from the board body 253, connecting with the conductive element 258. This shortens the path from the tab 223 to the conductive element 258. The tab 223's passage through the insertion hole 2531 and extension to the side of the conductive element 258 away from the board body 253 not only facilitates the connection between the tab 223 and the conductive element 258 but also allows for a more compact arrangement of the circuit board 25 and the solid-state battery 22, facilitating full utilization of the space inside the casing 21 and thus improving the energy density of the battery assembly 20.

[0220] In some embodiments, as shown in FIG5, the solid-state battery 22 includes an electrode assembly 221, which is not encapsulated and is directly housed within the housing 21. The electrode assembly 221 includes a positive electrode layer 2211, a solid electrolyte layer 2212, and a negative electrode layer 2213 stacked along a first direction X. Along the first direction X, at least a portion of the solid electrolyte layer 2212 is located between the positive electrode layer 2211 and the negative electrode layer 2213.

[0221] That is, the solid-state battery 22 is the electrode assembly 221, and the solid-state battery 22 is the bare cell.

[0222] The solid-state battery 22 includes an electrode assembly 221. The electrode assembly 221 is not encapsulated and is directly housed in the housing 21. Therefore, the solid-state battery 22 does not need to be packaged with a packaging 222, which helps to reduce the volume of the solid-state battery 22 and thus helps to improve the energy density of the battery device 100.

[0223] As shown in Figures 3, 4, and 6, in some embodiments, the solid-state battery 22 includes a package 222 and an electrode assembly 221. The electrode assembly 221 is housed within the package 222. The electrode assembly 221 includes a positive electrode layer 2211, a solid electrolyte layer 2212, and a negative electrode layer 2213 stacked along a first direction X. Along the first direction X, at least a portion of the solid electrolyte layer 2212 is located between the positive electrode layer 2211 and the negative electrode layer 2213.

[0224] Packaging component 222 is used to encapsulate components such as electrode assembly 221. Packaging component 222 can be a steel shell, aluminum shell, plastic shell (such as polypropylene), composite metal shell (such as copper-aluminum composite shell), or aluminum-plastic film, etc. Figures 3, 4, and 6 show the case where packaging component 222 is aluminum-plastic film, that is, the solid-state battery 22 is a pouch cell.

[0225] The solid-state battery 22 also includes a package 222, within which the electrode assembly 221 is housed, reducing the risk of harmful substances such as hydrogen sulfide generated by the solid-state battery 22 leaking into the external environment. The package 222 protects the electrode assembly 221, reducing the risk of damage to the electrode assembly 221 from external structures and forces, and improving the solid-state battery 22's resistance to external forces.

[0226] In some embodiments, as shown in Figures 3, 4, 6, and 11, the housing 21 includes a first wall 213 and a second wall 214 disposed opposite to each other along a first direction X, the first wall 213 and the second wall 214 being configured to cooperate in clamping a plurality of solid-state batteries 22.

[0227] The two surfaces of the solid-state battery 22 that are opposite each other along the first direction X can be the surfaces with the largest area of ​​the solid-state battery 22, that is, the outer casing 21 clamps the solid-state battery 22 at least along the arrangement direction of the large surface of the solid-state battery 22.

[0228] The first wall 213 and the second wall 214 cooperate to clamp multiple solid-state batteries 22. That is, the first wall 213 and the second wall 214 provide clamping or compressing force along the first direction X for all solid-state batteries 22 of the battery assembly 20. After the solid-state batteries 22 are clamped by the first wall 213 and the second wall 214, the shape of the solid-state batteries 22 may change or may not change significantly.

[0229] There are several ways to determine whether the solid-state battery 22 is subjected to the compressive force of the first wall 213 and the second wall 214 in the first direction X. For example, a pressure sensor can be installed on the surface of the solid-state battery 22 along the first direction X to detect it. Alternatively, the solid-state battery 22 can be removed from the casing 21 and its size in the first direction X can be compared before and after removal. If the size of the solid-state battery 22 in the first direction X increases after removal compared to before removal, it can be considered that the solid-state battery 22 is subjected to the compressive force of the first wall 213 and the second wall 214 in the first direction X inside the casing 21.

[0230] A positive electrode layer 2211, a solid electrolyte 2212, and a negative electrode layer 2213 are stacked along a first direction X, with at least a portion of the solid electrolyte 2212 layer located between the positive electrode layer 2211 and the negative electrode layer 2213. Multiple solid-state batteries 22 are clamped together by a first wall 213 and a second wall 214 of the outer casing 21 arranged opposite each other along the first direction X, so that the positive electrode layer 2211, the solid electrolyte 2212, and the negative electrode layer 2213 of the solid-state battery 22 can be more tightly bonded, so that there is effective contact between the positive electrode layer 2211, the solid electrolyte 2212, and the negative electrode layer 2213, improving the ion and electron transport efficiency, thereby improving conductivity, energy density, and enhancing the stability and reliability of the battery device 100. It can also reduce the volume change of the solid-state battery 22 individual cells during operation, thereby improving the stability and service life of the battery device 100. The first wall 213 and the second wall 214 work together to hold multiple solid-state batteries 22, which also helps to make full use of the space of the outer casing 21 in the first direction X, improve the energy density of the battery assembly 20, and thus improve the energy density of the battery device 100.

[0231] As shown in Figures 3-4 and 11, in some embodiments, the housing 21 further includes a third wall 215 and a fourth wall 216 opposite each other along the second direction Y. The third wall 215 and the fourth wall 216 are both connected to the first wall 213 and the second wall 214. The third wall 215 and the fourth wall 216 are configured to cooperate in clamping a plurality of solid-state batteries 22. The dimension of the housing 21 along the third direction Z is the dimension of the housing 21 along the first direction X. The dimension of the housing 21 along the third direction Z is the dimension of the housing 21 along the second direction Y. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0232] Along the second direction Y, one end of the first wall 213 and one end of the second wall 214 are both connected to the third wall 215, and the other end of the first wall 213 and one other end of the second wall 214 are both connected to the fourth wall 216.

[0233] The first wall 213 and the second wall 214 can be separately configured and connected to the third wall 215 as a whole. The first wall 213 and the second wall 214 can be connected to the third wall 215 by welding, bonding or other methods. The first wall 213, the second wall 214 and the third wall 215 can also be integrally formed, for example by casting, stamping, bending or other integral forming methods.

[0234] The first wall 213 and the second wall 214 can be separately configured and connected to the fourth wall 216 as a whole. The first wall 213 and the second wall 214 can be connected to the fourth wall 216 by welding, bonding, etc. The first wall 213, the second wall 214 and the fourth wall 216 can also be integrally formed, for example by casting, stamping, bending and other integral forming methods.

[0235] The third wall 215 and the fourth wall 216 cooperate to clamp multiple solid-state batteries 22. That is, the third wall 215 and the fourth wall 216 provide clamping or compressing force along the second direction Y for all solid-state batteries 22 of the battery assembly 20. After the solid-state batteries 22 are clamped by the third wall 215 and the fourth wall 216, the shape of the solid-state batteries 22 may change or may not change significantly.

[0236] There are several ways to determine whether the solid-state battery 22 is subjected to the compressive force of the third wall 215 and the fourth wall 216 in the second direction Y. For example, a pressure sensor can be installed on the surface of the solid-state battery 22 along the second direction Y to detect it. Alternatively, the solid-state battery 22 can be removed from the casing 21 and the size of the solid-state battery 22 in the second direction Y can be compared before and after removal. If the size of the solid-state battery 22 in the second direction Y increases after removal compared to before removal, it can be considered that the solid-state battery 22 is subjected to the compressive force of the third wall 215 and the fourth wall 216 in the second direction Y within the casing 21.

[0237] The outer casing 21 has a larger dimension along the third direction Z than its dimension along the first direction X, and its dimension along the third direction Z is larger than its dimension along the second direction Y; that is, the outer casing 21 has the largest dimension along the third direction Z. Similarly, the solid-state battery 22 has a larger dimension along the third direction Z than its dimension along the first direction X, and its dimension along the third direction Z is larger than its dimension along the second direction Y; that is, the solid-state battery 22 has the largest dimension along the third direction Z. The first direction X can be the thickness direction of the solid-state battery 22, the second direction Y can be the width direction of the solid-state battery 22, and the third direction Z can be the height direction of the solid-state battery 22.

[0238] The first wall 213 and the second wall 214 cooperate to clamp the solid-state battery 22 in the first direction X, and the third wall 215 and the fourth wall 216 cooperate to clamp the solid-state battery 22 in the second direction Y. That is, the outer shell 21 applies a clamping force to the solid-state battery 22 in the direction with smaller size, which is beneficial to ensure that each solid-state battery 22 is subjected to basically the same clamping force.

[0239] By clamping multiple solid-state batteries 22 together with the third wall 215 and the fourth wall 216 along the second direction Y, it is beneficial to improve the stability of the solid-state batteries 22 located in the housing 21 in the second direction Y, and to make full use of the space of the housing 21 in the second direction Y, thereby increasing the energy density of the battery assembly 20 and thus increasing the energy density of the battery device 100. In embodiments where the electrode assembly 221 has a wound structure, at least a portion of the solid electrolyte 2212 is located between the positive electrode layer 2211 and the negative electrode layer 2213 in the second direction Y. Multiple solid-state batteries 22 are clamped together by the third wall 215 and the fourth wall 216 of the outer casing 21, which are positioned opposite each other along the second direction Y. This allows the positive electrode layer 2211, the solid electrolyte 2212, and the negative electrode layer 2213 of the solid-state battery 22 to fit more tightly in the second direction Y, enabling effective contact between them. This improves the efficiency of ion and electron transport, thereby increasing conductivity, energy density, and enhancing the stability and reliability of the battery device 100. It also reduces the volume change of individual solid-state battery cells 22 during operation, thus improving the stability and lifespan of the battery device 100.

[0240] By having the outer casing 21 have a larger dimension along the third direction Z than the outer casing 21 has a larger dimension along the first direction X, and the outer casing 21 has a larger dimension along the third direction Z than the outer casing 21 has a larger dimension along the second direction Y, that is, the outer casing 21 applies a clamping force to the solid-state battery 22 in the direction with the smaller dimension, it is beneficial that each solid-state battery 22 is subjected to a basically the same clamping force.

[0241] Of course, in other embodiments, the third wall 215 and the fourth wall 216 may not clamp the solid-state battery 22 in the second direction Y, that is, the third wall 215 and the fourth wall 216 do not apply a clamping force to the solid-state battery 22 in the second direction Y. For example, if the electrode assembly 221 has a stacked structure, and the solid electrolyte 2212 is completely located between the positive electrode layer 2211 and the negative electrode layer 2213 in the first direction X, then there is no stacked positive electrode layer 2211, solid electrolyte 2212 and negative electrode layer 2213 in the second direction Y, and the fourth wall 216 and the third wall 215 may not clamp the solid-state battery 22 in the second direction Y.

[0242] In some embodiments, the housing 21 further includes a third wall 215 and a fourth wall 216 opposite each other along the second direction Y. The third wall 215 connects the first wall 213 and the second wall 214 to form a housing 21a having a first opening Q1 in the second direction Y. The fourth wall 216 closes the first opening Q1. The size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the first direction X. The size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the second direction Y. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0243] The first wall 213, the second wall 214, and the third wall 215 together form a U-shaped shell 21a.

[0244] The fourth wall 216 closes the first opening Q1, meaning that the fourth wall 216 is separately configured and connected to the first wall 213 and the second wall 214. The first wall 213 and the fourth wall 216 can be connected by welding, bonding, etc. The second wall 214 and the fourth wall 216 can also be connected by welding, bonding, etc.

[0245] The size of the outer casing 21 along the third direction Z is greater than the size of the outer casing 21 along the first direction X, and the size of the outer casing 21 along the third direction Z is greater than the size of the outer casing 21 along the second direction Y. It can be understood that the third direction Z is the direction in which the size of the outer casing 21 is the largest.

[0246] Solid-state batteries 22 can enter housing 21a through the first opening Q1. Before entering housing 21a through the first opening Q1, all stacked solid-state batteries 22 can be clamped on both sides along the first direction X by a clamping mechanism, so that all stacked solid-state batteries 22 can enter between the first wall 213 and the second wall 214. The clamping force of the clamping mechanism is released for the part that enters the first opening Q1, and the solid-state batteries 22 are clamped by the first wall 213 and the second wall 214. Alternatively, the position of the stacked solid-state batteries 22 can be kept unchanged, and the housing 21a can be moved so that the housing 21a covers the solid-state batteries 22 through the first opening Q1, i.e., the solid-state batteries 22 enter housing 21a through the first opening Q1. Or, the position of the housing 21a can be kept unchanged, and the stacked solid-state batteries 22 clamped by the clamping mechanism can be pushed into housing 21a through the first opening Q1. As the solid-state battery 22 enters the first opening Q1 and continues to move into the housing 21a, a portion of the surface of the solid-state battery 22 comes into frictional contact with the inner surfaces of the first wall 213 and the second wall 214. Since the second direction Y is the direction in which the size of the housing 21 is smaller, the size of the first wall 213 and the second wall 214 in the second direction Y is smaller. The path that the solid-state battery 22 needs to move relative to the housing 21a to fully enter the housing 21a is smaller, which can reduce the deformation of the first wall 213 and the second wall 214 during the process of the solid-state battery 22 entering the housing 21a, thereby reducing the friction between the first wall 213 and the solid-state battery 22 and the friction between the second wall 214 and the solid-state battery 22, making it easier for the solid-state battery 22 to enter the housing.

[0247] The third wall 215 connects the first wall 213 and the second wall 214 to form a housing 21a with a first opening Q1 in the second direction Y. The fourth wall 216 closes the first opening Q1. The size of the housing 21 in the third direction Z is greater than the size of the housing 21 in the first direction X. The size of the housing 21 in the third direction Z is greater than the size of the housing 21 in the second direction Y. Then the solid-state battery 22 can enter the housing 21a from the first opening Q1. The entry path of the solid-state battery 22 is shorter. The friction between the solid-state battery 22 and the first wall 213 and the second wall 214 is smaller, which reduces the difficulty of the solid-state battery 22 entering the housing and makes it easier for the solid-state battery 22 to enter the housing.

[0248] As shown in Figures 11-14, in some embodiments, along the second direction Y, the fourth wall 216 has a first abutting surface 2161 facing the third wall 215. One end of the first wall 213 facing away from the third wall 215 and one end of the second wall 214 facing away from the third wall 215 both abut against the first abutting surface 2161. The first abutting surface 2161 is provided with a first abutting portion 2162. Along the second direction Y, the two ends of the first abutting portion 2162 contact the first wall 213 and the second wall 214 respectively.

[0249] Along the first direction X, the first abutting surface 2161 protrudes from opposite ends of the first abutting portion 2162. The ends of the first wall 213 and the second wall 214 that are opposite to the third wall 215 abut against the portions of the first abutting surface 2161 that protrude from the first abutting portion 2162 along the first direction X. Along the first direction X, the first wall 213 has a first outer surface 2131 that is opposite to the second wall 214, the second wall 214 has a second outer surface 2143 that is opposite to the first wall 213, and the fourth wall 216 has opposing first end faces 2163 and second end faces 2164. The first outer surface 2131 and the first end face 2163 are flush, and the second outer surface 2143 and the second end face 2164 are flush.

[0250] After the first wall 213 and the second wall 214 abut against the first abutting surface 2161, the third wall 215 and the fourth wall 216 can cooperate to clamp the solid-state battery 22 in the second direction Y. After the first wall 213 and the second wall 214 abut against the first abutting surface 2161, the end of the first abutting part 2162 facing away from the fourth wall 216 can be pressed against the solid-state battery 22, thereby enabling the fourth wall 216 and the third wall 215 to cooperate to clamp the solid-state battery 22.

[0251] Along the second direction Y, the two ends of the first abutment portion 2162 contact the first wall 213 and the second wall 214 respectively. The housing 21a and the fourth wall 216 can then be positioned by the first abutment portion 2162. The first abutment portion 2162 guides the first wall 213 and the second wall 214 to abut against the first abutment surface 2161, facilitating the engagement of the fourth wall 216 and the housing 21a. The ends of the first wall 213 and the second wall 214 that are opposite to the third wall 215 both abut against the first abutment surface 2161, allowing the first wall 213 and the second wall 214 to mutually limit the fourth wall 216 in the second direction Y, thus facilitating the connection between the first wall 213 and the fourth wall 216, and between the second wall 214 and the fourth wall 216.

[0252] As shown in Figures 15-17, in some other embodiments, along the first direction X, the first wall 213 and the second wall 214 may each have a gap M with both ends of the first abutment portion 2162, reducing the risk of damage to the first abutment portion 2162 during welding of the first wall 213 and the fourth wall 216 and welding of the second wall 214 and the fourth wall 216.

[0253] In some embodiments, the first wall 213, the second wall 214, and the third wall 215 are integrally formed.

[0254] The first wall 213, the second wall 214, and the third wall 215 can be integrally formed by casting, stamping, bending, or other methods.

[0255] By integrally forming the first wall 213, the second wall 214 and the third wall 215, the structural strength and sealing performance of the outer casing 21 are improved, and the number of walls that need to be connected to the outer casing 21 is reduced, which simplifies the manufacturing process of the battery device 100 and reduces the manufacturing difficulty.

[0256] As shown in Figures 18-20 and 21-23, in some embodiments, the first wall 213 and the second wall 214 are both welded to the fourth wall 216.

[0257] Specifically, the portion of the fourth wall 216 that abuts against the first wall 213 is welded to the first wall 213 to form a weld mark P, and the portion of the fourth wall 216 that abuts against the second wall 214 is welded to the second wall 214 to form a weld mark P.

[0258] The first wall 213 and the fourth wall 216 can be welded by laser welding, ultrasonic welding, or other welding methods. The second wall 214 and the fourth wall 216 can also be welded by laser welding, ultrasonic welding, or other welding methods.

[0259] By welding the first wall 213 and the second wall 214 to the fourth wall 216, the connection between the first wall 213 and the fourth wall 216, and between the second wall 214 and the fourth wall 216, is made to have good connection stability. The first wall 213 and the fourth wall 216, and the second wall 214 and the fourth wall 216, can also be sealed by welding. There is no need to set up other sealing structures. That is, welding can achieve a sealed connection between the first wall 213 and the fourth wall 216, and between the second wall 214 and the fourth wall 216, making the structure of the battery assembly 20 simpler and easier to assemble.

[0260] In other embodiments, the housing 21 further includes a third wall 215 and a fourth wall 216 opposite each other along the second direction Y, a first wall 213 connecting the third wall 215 and the fourth wall 216 to form a housing 21a having a first opening Q1 in the first direction X, and a second wall 214 closing the first opening Q1; wherein the size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the first direction X, the size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the second direction Y, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0261] The third wall 215, the first wall 213, and the fourth wall 216 together form a U-shaped shell 21a.

[0262] The second wall 214 closes the first opening Q1, meaning that the second wall 214 is separately configured and connected to the third wall 215 and the fourth wall 216. The second wall 214 and the third wall 215 can be connected by welding, bonding, etc. The second wall 214 and the fourth wall 216 can be connected by welding, bonding, etc.

[0263] The size of the outer casing 21 along the third direction Z is greater than the size of the outer casing 21 along the first direction X, and the size of the outer casing 21 along the third direction Z is greater than the size of the outer casing 21 along the second direction Y. It can be understood that the third direction Z is the direction in which the size of the outer casing 21 is the largest.

[0264] In the embodiment where the fourth wall 216 and the third wall 215 clamp the solid-state battery 22 along the second direction Y, the solid-state battery 22 can enter the housing 21a through the first opening Q1. Before the solid-state battery 22 enters the housing 21a through the first opening Q1, all the stacked solid-state batteries 22 can be clamped on both sides along the second direction Y by the clamping mechanism, so that all the stacked solid-state batteries 22 can enter between the third wall 215 and the fourth wall 216. The clamping force of the clamping mechanism is released for the part that enters the first opening Q1, and the solid-state battery 22 is clamped by the third wall 215 and the fourth wall 216.

[0265] One approach is to keep the position of the stacked solid-state battery 22 unchanged and move the housing 21a so that the housing 21a covers the solid-state battery 22 through the first opening Q1, that is, the solid-state battery 22 enters the housing 21a through the first opening Q1. Another approach is to keep the position of the housing 21a unchanged and push the stacked solid-state battery 22, which is held by the clamping mechanism, into the housing 21a through the first opening Q1. As the solid-state battery 22 enters the first opening Q1 and continues to move into the housing 21a, a portion of the surface of the solid-state battery 22 comes into frictional contact with the inner surfaces of the third wall 215 and the fourth wall 216. Since the first direction X is the direction in which the size of the housing 21 is smaller, the dimensions of the third wall 215 and the fourth wall 216 in the first direction X are smaller. The path that the solid-state battery 22 needs to move relative to the housing 21a to fully enter the housing 21a is smaller, which can reduce the deformation of the third wall 215 and the fourth wall 216 during the process of the solid-state battery 22 entering the housing 21a, thereby reducing the friction between the third wall 215 and the solid-state battery 22 and the friction between the fourth wall 216 and the solid-state battery 22, making it easier for the solid-state battery 22 to enter the housing.

[0266] After the second wall 214 closes the first opening Q1, the first wall 213 and the second wall 214 cooperate to clamp the solid battery 22 along the first direction X.

[0267] The first wall 213 connects the third wall 215 and the fourth wall 216 to form a housing 21a with a first opening Q1 in the first direction X. The second wall 214 closes the first opening Q1. The size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the first direction X. The size of the housing 21 along the third direction Z is greater than the size of the housing 21 along the second direction Y. Then the solid-state battery 22 can enter the housing 21a through the first opening Q1. The entry path of the solid-state battery 22 is shorter. The friction between the solid-state battery 22 and the third wall 215 and the fourth wall 216 is smaller, which reduces the difficulty of the solid-state battery 22 entering the housing and makes it easier for the solid-state battery 22 to enter the housing. After the second wall 214 closes the first opening Q1, the first wall 213 and the second wall 214 together clamp multiple solid-state batteries 22, allowing the positive electrode layer 2211, solid electrolyte 2212, and negative electrode layer 2213 of the solid-state batteries 22 to fit more tightly. This ensures effective contact between the positive electrode layer 2211, solid electrolyte 2212, and negative electrode layer 2213, improving the transport efficiency of ions and electrons, thereby increasing conductivity, energy density, and enhancing the stability and reliability of the battery device 100. It also reduces the volume change of the solid-state batteries 22 during operation, thus improving the stability and lifespan of the battery device 100. The cooperation of the first wall 213 and the second wall 214 in clamping multiple solid-state batteries 22 also helps to fully utilize the space of the outer casing 21 in the first direction X, increasing the energy density of the battery assembly 20, thereby increasing the energy density of the battery device 100.

[0268] As shown in Figures 26-29, in some embodiments, along the first direction X, the second wall 214 has a second abutting surface 2141 facing the first wall 213, and the end of the third wall 215 away from the first wall 213 and the end of the fourth wall 216 away from the first wall 213 both abut against the second abutting surface 2141. The second abutting surface 2141 is provided with a second abutting portion 2142, and along the first direction X, the two ends of the second abutting portion 2142 contact the third wall 215 and the fourth wall 216 respectively.

[0269] Along the second direction Y, the second abutment surface 2141 protrudes from opposite ends of the second abutment portion 2142. The end of the third wall 215 facing away from the first wall 213 and the end of the fourth wall 216 facing away from the first wall 213 respectively abut against the portions of the second abutment surface 2141 that protrude from the second abutment portion 2142 along the second direction Y. Along the second direction Y, the third wall 215 has a third outer surface 2151 facing away from the fourth wall 216, the fourth wall 216 has a fourth outer surface 2165 facing away from the third wall 215, and the second wall 214 has opposing third end faces 2144 and fourth end faces 2145. The third outer surface 2151 and the third end face 2144 are flush, and the fourth outer surface 2165 and the fourth end face 2145 are flush.

[0270] When both the third wall 215 and the fourth wall 216 abut against the second abutment surface 2141, the first wall 213 and the second wall 214 can cooperate to clamp the solid-state battery 22 in the first direction X. When both the third wall 215 and the fourth wall 216 abut against the second abutment surface 2141, the end of the second abutment portion 2142 facing away from the second wall 214 can be pressed against the solid-state battery 22, thereby enabling the first wall 213 and the second wall 214 to cooperate to clamp the solid-state battery 22.

[0271] Along the first direction X, the two ends of the second abutment 2142 contact the third wall 215 and the fourth wall 216 respectively. The housing 21a and the second wall 214 can then be positioned by the second abutment 2142. The second abutment 2142 guides the third wall 215 and the fourth wall 216 to abut against the second abutment surface 2141, facilitating the engagement of the second wall 214 and the housing 21a. The ends of the third wall 215 and the fourth wall 216 that are opposite to the first wall 213 both abut against the second abutment surface 2141, allowing the third wall 215 and the fourth wall 216 to mutually limit their position relative to the second wall 214 in the first direction X, thus facilitating the connection between the third wall 215 and the second wall 214, and between the fourth wall 216 and the second wall 214.

[0272] As shown in Figures 30-32, in some other embodiments, along the second direction Y, the third wall 215 and the fourth wall 216 may each have a gap M with both ends of the second abutment portion 2142, thereby reducing the risk of damage to the second abutment portion 2142 during welding of the third wall 215 and the second wall 214, and welding of the fourth wall 216 and the second wall 214.

[0273] In some embodiments, the first wall 213, the third wall 215, and the fourth wall 216 are integrally formed.

[0274] The first wall 213, the third wall 215, and the fourth wall 216 can be integrally formed by casting, stamping, bending, or other methods.

[0275] By integrally forming the first wall 213, the third wall 215 and the fourth wall 216, the structural strength and sealing performance of the outer casing 21 are improved, and the number of walls that need to be connected to the outer casing 21 is reduced, which simplifies the manufacturing process of the battery device 100 and reduces the manufacturing difficulty.

[0276] As shown in Figures 33-35 and 36-38, in some embodiments, the third wall 215 and the fourth wall 216 are both welded to the second wall 214.

[0277] Specifically, the portion of the second wall 214 that abuts against the third wall 215 is welded to the third wall 215 to form a weld mark P, and the portion of the second wall 214 that abuts against the fourth wall 216 is welded to the fourth wall 216 to form a weld mark P.

[0278] The second wall 214 and the third wall 215 can be welded by laser welding, ultrasonic welding, or other welding methods. The second wall 214 and the fourth wall 216 can also be welded by laser welding, ultrasonic welding, or other welding methods.

[0279] By welding the third wall 215 and the fourth wall 216 to the second wall 214, the third wall 215 and the second wall 214, as well as the fourth wall 216 and the second wall 214, have good connection stability. The third wall 215 and the second wall 214, and the fourth wall 216 and the second wall 214 can also be sealed by welding, eliminating the need for other sealing structures. Welding can achieve a sealed connection between the third wall 215 and the second wall 214, as well as between the fourth wall 216 and the second wall 214, making the structure of the battery assembly 20 simpler and easier to assemble.

[0280] As shown in Figures 3, 4, 24, and 25, in some embodiments, along the third direction Z, the housing 21a has opposing second openings Q2 and third openings Q3, and the housing 21 also includes a fifth wall 217 and a sixth wall 218, which respectively close the second opening Q2 and the third opening Q3; a first output portion 20a and a second output portion 20b are formed on the fifth wall 217; or, the first output portion 20a and the second output portion 20b are respectively formed on the fifth wall 217 and the sixth wall 218, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0281] The fifth wall 217 has a third abutting surface (not shown) facing the sixth wall 218, and the third abutting surface has a third abutting portion (not shown). Along the first direction X, the third abutting surface protrudes beyond both ends of the third abutting portion; along the second direction Y, the third abutting surface protrudes beyond both ends of the third abutting portion. Along the first direction X, the fifth wall 217 has opposing fifth and sixth end faces; along the second direction Y, the fifth wall 217 has opposing seventh and eighth end faces.

[0282] The sixth wall 218 has a fourth abutment surface (not shown in the figure) facing the fifth wall 217, and the fourth abutment surface has a fourth abutment portion (not shown in the figure) protruding from it. Along the first direction X, the fourth abutment surface protrudes beyond both ends of the fourth abutment portion; along the second direction Y, the fourth abutment surface protrudes beyond both ends of the fourth abutment portion. Along the first direction X, the sixth wall 218 has opposing ninth and tenth end faces; along the second direction Y, the sixth wall 218 has opposing eleventh and twelfth end faces.

[0283] In an embodiment where the third wall 215 connects the first wall 213 and the second wall 214 to form a housing 21a having a first opening Q1 in the second direction Y, and the fourth wall 216 closes the first opening Q1, along the third direction Z, one end of the first wall 213, one end of the second wall 214, and one end of the third wall 215 together define the second opening Q2. The ends of the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 that are opposite to the third opening Q3 all abut against a third abutment surface. Specifically, the ends of the first wall 213 and the second wall 214 that are opposite to the third opening Q3 abut against portions of the third abutment surface that protrude from the third abutment portion along the first direction X, and the ends of the third wall 215 and the fourth wall 216 that are opposite to the third opening Q3 abut against portions of the third abutment surface that protrude from the third abutment portion along the second direction Y, respectively.

[0284] The first outer surface 2131 of the first wall 213 can be flush with the fifth end face, and the second outer surface 2143 of the second wall 214 can be flush with the sixth end face. The third outer surface 2151 of the third wall 215 can be flush with the seventh end face, and the fourth outer surface 2165 of the fourth wall 216 can be flush with the eighth end face.

[0285] Along the first direction X, the two ends of the third abutment contact the first wall 213 and the second wall 214 respectively. Along the second direction Y, the two ends of the third abutment can contact the third wall 215 and the fourth wall 216 respectively. Thus, the housing 21a and the fifth wall 217 can be positioned by the third abutment. The third abutment can guide the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 to abut against the third abutment surface, facilitating the engagement of the fifth wall 217 and the housing 21a. The housing 21a abuts against the third abutment surface at the corresponding end of the second opening Q2, enabling the fifth wall 217 and the housing 21a to mutually limit each other in the third direction Z, thereby facilitating the connection between the fifth wall 217 and the housing 21a.

[0286] Along the third direction Z, the other ends of the first wall 213, the second wall 214, and the third wall 215 together define the third opening Q3. The ends of the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 that are opposite to the second opening Q2 all abut against the fourth abutment surface. Specifically, the ends of the first wall 213 and the second wall 214 that are opposite to the second opening Q2 abut against the portions of the fourth abutment surface that protrude from the fourth abutment portion along the first direction X, and the ends of the third wall 215 and the fourth wall 216 that are opposite to the second opening Q2 abut against the portions of the fourth abutment surface that protrude from the fourth abutment portion along the second direction Y, respectively.

[0287] The first outer surface 2131 of the first wall 213 can be flush with the ninth end face, and the second outer surface 2143 of the second wall 214 can be flush with the tenth end face. The third outer surface 2151 of the third wall 215 can be flush with the eleventh end face, and the fourth outer surface 2165 of the fourth wall 216 can be flush with the twelfth end face.

[0288] Along the first direction X, the two ends of the fourth abutment contact the first wall 213 and the second wall 214 respectively. Along the second direction Y, the two ends of the fourth abutment can contact the third wall 215 and the fourth wall 216 respectively. Thus, the housing 21a and the sixth wall 218 can be positioned by the fourth abutment. The fourth abutment can guide the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 to abut against the fourth abutment surface, facilitating the engagement of the sixth wall 218 and the housing 21a. The housing 21a abuts against the fourth abutment surface at the end corresponding to the third opening Q3, allowing the sixth wall 218 and the housing 21a to mutually limit each other in the third direction Z, thereby facilitating the connection between the sixth wall 218 and the housing 21a.

[0289] In an embodiment where the first wall 213 connects the third wall 215 and the fourth wall 216 to form a housing 21a having a first opening Q1 in the first direction X, and the second wall 214 closes the first opening Q1, along the third direction Z, one end of the first wall 213, one end of the third wall 215, and one end of the fourth wall 216 together define a second opening Q2. The ends of the first wall 213, the third wall 215, the fourth wall 216, and the second wall 214 that are opposite to the third opening Q3 all abut against a third abutment surface. Specifically, the ends of the first wall 213 and the second wall 214 that are opposite to the third opening Q3 abut against portions of the third abutment surface that protrude from the third abutment portion along the first direction X, and the ends of the third wall 215 and the fourth wall 216 that are opposite to the third opening Q3 abut against portions of the third abutment surface that protrude from the third abutment portion along the second direction Y, respectively.

[0290] The first outer surface 2131 of the first wall 213 can be flush with the fifth end face, and the second outer surface 2143 of the second wall 214 can be flush with the sixth end face. The third outer surface 2151 of the third wall 215 can be flush with the seventh end face, and the fourth outer surface 2165 of the fourth wall 216 can be flush with the eighth end face.

[0291] Along the first direction X, the two ends of the third abutment contact the first wall 213 and the second wall 214 respectively. Along the second direction Y, the two ends of the third abutment can contact the third wall 215 and the fourth wall 216 respectively. Thus, the housing 21a and the fifth wall 217 can be positioned by the third abutment. The third abutment can guide the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 to abut against the third abutment surface, facilitating the engagement of the fifth wall 217 and the housing 21a. The housing 21a abuts against the third abutment surface at the corresponding end of the second opening Q2, enabling the fifth wall 217 and the housing 21a to mutually limit each other in the third direction Z, thereby facilitating the connection between the fifth wall 217 and the housing 21a.

[0292] Along the third direction Z, the other ends of the first wall 213, the third wall 215, and the fourth wall 216 together define the third opening Q3. The ends of the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 that are opposite to the second opening Q2 all abut against the fourth abutment surface. Specifically, the ends of the first wall 213 and the second wall 214 that are opposite to the second opening Q2 abut against the portions of the fourth abutment surface that protrude from the fourth abutment portion along the first direction X, and the ends of the third wall 215 and the fourth wall 216 that are opposite to the second opening Q2 abut against the portions of the fourth abutment surface that protrude from the fourth abutment portion along the second direction Y, respectively.

[0293] The first outer surface 2131 of the first wall 213 can be flush with the ninth end face, and the second outer surface 2143 of the second wall 214 can be flush with the tenth end face. The third outer surface 2151 of the third wall 215 can be flush with the eleventh end face, and the fourth outer surface 2165 of the fourth wall 216 can be flush with the twelfth end face.

[0294] Along the first direction X, the two ends of the fourth abutment contact the first wall 213 and the second wall 214 respectively. Along the second direction Y, the two ends of the fourth abutment can contact the third wall 215 and the fourth wall 216 respectively. Thus, the housing 21a and the sixth wall 218 can be positioned by the fourth abutment. The fourth abutment can guide the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 to abut against the fourth abutment surface, facilitating the engagement of the sixth wall 218 and the housing 21a. The housing 21a abuts against the fourth abutment surface at the end corresponding to the third opening Q3, allowing the sixth wall 218 and the housing 21a to mutually limit each other in the third direction Z, thereby facilitating the connection between the sixth wall 218 and the housing 21a.

[0295] Both the first output section 20a and the second output section 20b may be provided with a fifth wall 217. Alternatively, the first output section 20a and the second output section 20b may be provided on the fifth wall 217 and the sixth wall 218, respectively.

[0296] By placing the first output portion 20a and the second output portion 20b on the fifth wall 217 in the third direction Z, or by placing the first output portion 20a and the second output portion 20b on the fifth wall 217 and the sixth wall 218 in the third direction Z, the wall portion where the solid-state battery 22 is clamped by external force has a different orientation than the first output portion 20a and the second output portion 20b. This facilitates the electrical connection between the first output portion 20a and the second output portion 20b and the solid-state battery 22. Since the wall portion where the solid-state battery 22 is clamped by external force has a different orientation than the first output portion 20a and the second output portion 20b, the risk of interference between the external clamping mechanism and the first output portion 20a and the second output portion 20b can be reduced.

[0297] In some embodiments, the solid-state battery 22 has a first tab 223a and a second tab 223b, which are located at the ends of the solid-state battery 22 along the third direction Z. The first tab 223a and the second tab 223b are respectively connected to the first output portion 20a and the second output portion 20b.

[0298] In the embodiment where both the first output portion 20a and the second output portion 20b are formed on the fifth wall 217, the first tab portion 223a and the second tab portion 223b are both located at the end of the solid-state battery 22 facing the fifth wall 217 in the third direction Z, so as to facilitate the connection of the first tab portion 223a and the second tab portion 223b to the first output portion 20a and the second output portion 20b respectively.

[0299] In the embodiment where the first output portion 20a and the second output portion 20b are respectively formed on the fifth wall 217 and the sixth wall 218, the first tab portion 223a and the second tab portion 223b are respectively located at the two ends of the solid-state battery 22 in the third direction Z opposite each other. The first tab portion 223a is disposed near the fifth wall 217, and the second tab portion 223b is disposed near the sixth wall 218, so as to facilitate the connection of the first tab portion 223a and the second tab portion 223b with the first output portion 20a and the second output portion 20b respectively.

[0300] With the first tab 223a and the second tab 223b located at the end of the solid-state battery 22 along the third direction Z, and the first output portion 20a and the second output portion 20b located on the wall portion of the housing 21 along the third direction Z, it is convenient to connect the first tab 223a and the second tab 223b with the first output portion 20a and the second output portion 20b.

[0301] In some embodiments, at least one of the third wall 215 and the fourth wall 216 is the wall with the largest outer surface area of ​​the housing 21.

[0302] The third wall 215 can be the wall with the largest surface area of ​​the outer shell 21, or the fourth wall 216 can be the wall with the largest surface area of ​​the outer shell 21. Of course, both the third wall 215 and the fourth wall 216 can be the walls with the largest surface area of ​​the outer shell 21.

[0303] In this embodiment, the structure of the third wall 215 and the structure of the fourth wall 216 can be the same. The area of ​​the outer surface of the third wall 215 and the area of ​​the outer surface of the fourth wall 216 are the same. The third wall 215 and the fourth wall 216 are the walls with the largest outer surface area of ​​the outer shell 21.

[0304] Since the third wall 215 and the fourth wall 216 are arranged opposite each other in the second direction Y, which is different from the stacking direction (first direction X) of the positive electrode layer 2211, the solid electrolyte 2212 and the negative electrode layer 2213, and since at least one of the third wall 215 and the fourth wall 216 is the wall with the largest outer surface area of ​​the outer shell 21, the outer surface area of ​​the wall of the outer shell 21 in the stacking direction of the positive electrode layer 2211, the solid electrolyte 2212 and the negative electrode layer 2213 is smaller. This makes it easier to clamp the solid battery 22 along the stacking direction of the positive electrode layer 2211, the solid electrolyte 2212 and the negative electrode layer 2213, so that the positive electrode layer 2211, the solid electrolyte 2212 and the negative electrode layer 2213 are more tightly attached.

[0305] In some embodiments, the size of the housing 21 along the second direction Y is smaller than the size of the housing 21 along the first direction X.

[0306] That is, the dimension of the outer casing 21 along the second direction Y is smaller than the dimension of the outer casing 21 along the first direction X, and the dimension of the outer casing 21 along the first direction X is smaller than the dimension of the outer casing 21 along the third direction Z. When the outer casing 21a has a first opening Q1 for the solid-state battery 22 to enter in the second direction Y or the first direction X, the movement path of the solid-state battery 22 into the outer casing 21a through the first opening Q1 is shorter, which can reduce the friction between the solid-state battery 22 and the wall of the outer casing 21 during the insertion process, and facilitate the insertion of the solid-state battery 22 into the casing.

[0307] If the size of the outer casing 21 along the second direction Y is smaller than the size of the outer casing 21 along the first direction X, then more solid-state batteries 22 can be arranged in the first direction X. Furthermore, since the first wall 213 and the second wall 214 cooperate to clamp multiple solid-state batteries 22 in the first direction X, more solid-state batteries 22 can be arranged in the first direction X, which is beneficial to improving the energy density of the battery device 100.

[0308] In some embodiments, in each battery assembly 20, a plurality of solid-state batteries 22 are arranged along the first direction X.

[0309] In each battery assembly 20, a plurality of solid-state batteries 22 are arranged along the first direction X, and the first wall 213 and the second wall 214 of the housing 21 cooperate to clamp the plurality of solid-state batteries 22 in the first direction X, so that the plurality of solid-state batteries 22 can be arranged more closely, making full use of the internal space of the housing 21, which is beneficial to improving the energy density of the battery assembly 20, and thus improving the energy density of the battery device 100.

[0310] As shown in Figure 39, in some embodiments, the electrode assembly 221 includes a positive electrode 2214 and a negative electrode 2215, which are stacked in small layers along a first direction, and a solid electrolyte layer 2212 is disposed between adjacent positive electrode 2214 and negative electrode 2215; the positive electrode 2214 includes a positive current collector 22141 and a positive active material layer 22142, and the positive active material layer 22142 is disposed on at least one side of the positive current collector 22141; the negative electrode 2215 includes a negative current collector 22151 and a negative active material layer 22152, and the negative active material layer 22152 is disposed on at least one side of the negative current collector 22151; one positive active material layer 22142 forms a positive layer 2211, and one negative active material layer 22152 forms a negative layer 2213.

[0311] Both the positive current collector 22141 and the negative current collector 22151 are conductors as a whole.

[0312] In some embodiments, the first tab 223a may be integrally formed with the positive current collector 22141 of the positive electrode 2214. In other embodiments, the first tab 223a may include a first part and a second part. The first part is integrally formed with the positive current collector 22141 of the positive electrode 2214, and the second part is connected to the first part. The second part extends out to the packaging 222 and connects to the first output part 20a. The first part and the second part may be connected by adhesive bonding, welding, or other means.

[0313] In some embodiments, the second electrode tab 223b may be integrally formed with the negative current collector 22151 of the negative electrode plate 2215. In other embodiments, the second electrode tab 223b may include a third part and a fourth part, the third part being integrally formed with the negative current collector 22151 of the negative electrode plate 2215, and the fourth part being connected to the third part. The fourth part extends out of the packaging 222 and connects to the second output part 20b. The third part and the fourth part may be connected by adhesive bonding, welding, or the like.

[0314] The positive electrode 2214 includes a positive current collector 22141 and a positive active material layer 22142. The positive active material layer 22142 is disposed on at least one side of the positive current collector 22141. The negative electrode 2215 includes a negative current collector 22151 and a negative active material layer 22152. The negative active material layer 22152 is disposed on at least one side of the negative current collector 22151. That is, both the positive electrode 2214 and the negative electrode 2215 are single-polarity electrodes, which facilitates the manufacturing and shaping of the electrode assembly 221 and reduces the risk of short circuit in the solid-state battery 22.

[0315] In some embodiments, as shown in FIG40, the electrode assembly 221 includes a plurality of electrode sheets 2216, which are stacked along a first direction X, and a solid electrolyte layer 2212 is disposed between two adjacent electrode sheets 2216; the electrode sheet 2216 includes a composite current collector 22161, a positive electrode active material layer 22142 and a negative electrode active material layer 22152, and the composite current collector 22161 includes a first conductive layer 221611, an insulating layer 221612 and a second conductive layer stacked sequentially. Layer 221613, positive electrode active material layer 22142 is disposed on the surface of the first conductive layer 221611 away from the insulating layer 221612, negative electrode active material layer 22152 is disposed on the surface of the second conductive layer 221613 away from the insulating layer 221612, the positive electrode active material layer 22142 of one of the two adjacent electrode sheets 2216 forms a positive electrode layer 2211, and the negative electrode active material layer 22152 of the other of the two adjacent electrode sheets 2216 forms a negative electrode layer 2213.

[0316] An insulating layer 221612 is disposed between the first conductive layer 221611 and the second conductive layer 221613. The insulating layer 221612 provides insulation between the first conductive layer 221611 and the second conductive layer 221613, reducing the risk of short circuits between the first conductive layer 221611 and the second conductive layer 221613 on both sides of the insulating layer 221612. The materials of the first conductive layer 221611 and the second conductive layer 221613 can be the same or different. The first conductive layer 221611 can be made of aluminum, and the second conductive layer 221613 can be made of copper.

[0317] In some embodiments, the first tab 223a may be integrally formed with the first conductive layer 221611 of an electrode 2216. In other embodiments, the first tab 223a may include a first part and a second part, the first part being integrally formed with the first conductive layer 221611 of an electrode 2216, and the second part being connected to the first part. The second part extends out of the packaging 222 and connects to the first output part 20a. The first part and the second part may be connected by adhesive bonding, welding, or other means.

[0318] In some embodiments, the second electrode tab 223b may be integrally formed with the second conductive layer 221613 of an electrode 2216. In other embodiments, the second electrode tab 223b may include a third portion and a fourth portion, the third portion being integrally formed with the second conductive layer 221613 of an electrode 2216, and the fourth portion being connected to the third portion. The fourth portion extends out of the package 222 and connects to the second output portion 20b. The third portion and the fourth portion may be connected by adhesive bonding, welding, or the like.

[0319] The electrode 2216 includes a composite current collector 22161, a positive electrode active material layer 22142, and a negative electrode active material layer 22152. The composite current collector 22161 includes a first conductive layer 221611, an insulating layer 221612, and a second conductive layer 221613 stacked sequentially. The positive electrode active material layer 22142 is disposed on the surface of the first conductive layer 221611 that is away from the insulating layer 221612, and the negative electrode active material layer 22152 is disposed on the surface of the second conductive layer 221613 that is away from the insulating layer 221612. That is, the electrode 2216 is a bipolar electrode, which is beneficial to reducing the space occupied by the current collector in the solid-state battery 22, and beneficial to improving the energy density of the solid-state battery 22, thereby improving the energy density of the battery device 100.

[0320] Please continue to refer to Figure 2. In some embodiments, the housing 10 includes a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 together define a space for accommodating a plurality of battery components 20. The first housing 11 has a first sealing surface 111, and the second housing 12 has a second sealing surface 121. The first sealing surface 111 and the second sealing surface 121 are sealed together.

[0321] The first sealing surface 111 is the surface of the first housing 11 facing the second housing 12, and the second sealing surface 121 is the surface of the second housing 12 facing the first housing 11.

[0322] The first housing 11 has a first cavity 112, which is open to the side facing the second housing 12. The second housing 12 has a second cavity 122, which is open to the side facing the first housing 11. The first cavity 112 and the second cavity 122 together form a space for accommodating the battery assembly 20.

[0323] Specifically, the first housing 11 includes a first body 113 and a first flange 114. The first flange 114 surrounds the outer periphery of the first body 113 and protrudes from the outer periphery of the first body 113. The first sealing surface 111 can be the surface of the first flange 114 facing the second housing 12.

[0324] The second housing 12 includes a second main body 123 and a second flange 124. The second flange 124 surrounds the outer periphery of the second main body 123 and protrudes from the outer periphery of the second main body 123. The second sealing surface 121 can be the surface of the second flange 124 facing the first housing 11.

[0325] The first sealing surface 111 of the first housing 11 and the second sealing surface 121 of the second housing 12 are sealed together, thereby enabling the first housing 11 and the second housing 12 to jointly define the space for accommodating the battery assembly 20. This results in better sealing performance of the battery device 100, further reducing the risk of harmful gases such as hydrogen sulfide generated by the solid-state battery 22 leaking into the external environment, and improving the reliability of the battery device 100 and the reliability of using the battery device 100.

[0326] In some embodiments, the material of the housing 21 includes one or more types of aluminum and steel.

[0327] The outer casing 21 can be an aluminum casing, a steel casing, or an alloy casing.

[0328] The casing 21 is made of one or more materials, including aluminum and steel, which gives the casing high mechanical strength, thereby improving the battery assembly's ability to resist external forces.

[0329] As shown in Figure 4, in some embodiments, the housing 21 is also provided with a pressure relief component 26, which is used to release the pressure inside the battery assembly 20.

[0330] The pressure relief component 26 can release the internal pressure of the battery assembly 20 when the internal pressure or temperature reaches a threshold.

[0331] The pressure relief component 26 may be a component such as an explosion-proof valve, an explosion-proof disc, a gas valve, or a pressure relief valve.

[0332] The outer casing 21 is provided with a pressure relief component 26. By releasing the pressure inside the battery assembly 20 through the pressure relief component 26, the risk of the battery assembly 20 exploding, overheating, or catching fire can be reduced, which helps to improve the reliability of the battery device 100.

[0333] The pressure relief component 26 can be disposed on any wall of the housing 21. In some embodiments, the housing 21 includes a fifth wall 217 and a sixth wall 218 opposite to each other, and the first output portion 20a and the second output portion 20b are formed on the fifth wall 217; or, the first output portion 20a and the second output portion 20b are respectively disposed on the fifth wall 217 and the sixth wall 218; the pressure relief component 26 is disposed on the fifth wall 217 or the sixth wall 218.

[0334] The first output section 20a and the second output section 20b can both be formed on the fifth wall 217. In this case, the pressure relief component 26 can be provided on the fifth wall 217 or on the sixth wall 218 (as shown in Figure 4).

[0335] The first output section 20a and the second output section 20b can be formed on the fifth wall 217 and the sixth wall 218, respectively. In this case, the pressure relief component 26 can be provided on either the fifth wall 217 or the sixth wall 218.

[0336] The pressure relief component 26 is disposed on the fifth wall 217 or the sixth wall 218. That is, the pressure relief component 26, the first output part 20a and the second output part 20b can be located on the same side of the housing 21 or on opposite sides of the housing 21, thereby reducing the influence of the external structure of the battery assembly 20 on the pressure relief component 26 to release the pressure inside the housing 21 and improving the reliability of the battery device 100.

[0337] As shown in Figures 3, 4, and 41, in some embodiments, the battery assembly 20 further includes a fixing part 27, which is disposed on the outer casing 21 and connected to the housing 10.

[0338] The fixing part 27 protrudes from the outer surface of the housing 21. The fixing part 27 and the housing 21 can be separately provided and connected as one unit. The fixing part 27 and the housing 21 can be detachably connected, such as by bolts. The fixing part 27 and the housing 21 can be fixedly connected, such as by welding.

[0339] The fixing part 27 and the outer shell 21 can also be integrally formed.

[0340] The fixing part 27 can be provided on any wall of the housing 21. For example, as shown in FIG3 and FIG4, the fifth wall 217 and the sixth wall 218 of the housing 21 opposite each other in the third direction Z can both be provided with the fixing part 27.

[0341] The fixing part 27 and the housing 10 can be directly connected or indirectly connected.

[0342] By providing a fixing part 27 on the outer casing of the battery assembly 20, and connecting the fixing part 27 to the housing 10, the battery assembly 20 and the housing 10 are relatively fixed, thereby improving the stability of the battery assembly 20 within the housing 10.

[0343] As shown in Figure 41, in some embodiments, a partition beam 30 is provided inside the box 10. The partition beam 30 is used to divide the internal space of the box 10 into multiple subspaces N, and the fixing part 27 is connected to the partition beam 30.

[0344] The fixing part 27 and the partition beam 30 can be detachably connected, such as by bolts. Alternatively, the fixing part 27 and the partition beam 30 can be fixedly connected, such as by welding.

[0345] The fixing part 27 is connected to the partition beam 30, thereby indirectly realizing the connection between the box body 10 and the fixing part 27, which can reduce the impact on the strength of the box body 10 when the fixing part 27 is connected to the box body 10.

[0346] As shown in Figures 4 and 42, in some embodiments, the housing 21 is provided with a detection hole 219, which is configured to allow detection gas to enter the housing 21; the battery assembly 20 also includes a seal 28, which seals the detection hole 219.

[0347] The detection gas can be of various types, such as helium. The detection gas is introduced into the outer casing 21 through the detection port 219 at a certain rate. After a period of time, the leakage of the detection gas is observed, thereby determining the airtightness of the outer casing 21.

[0348] By providing a detection hole 219 for the detection gas to enter the housing 21, it is convenient to inject the detection gas into the housing 21 through the detection hole 219, thereby conducting airtightness testing on the housing 21. This makes airtightness testing of the battery assembly 20 more convenient and provides a basis for improving the sealing performance of the housing 21. The sealing element 28 seals the detection hole, improving the sealing performance of the battery assembly 20.

[0349] This application also provides an electrical device, which includes the battery device 100 provided in any of the above embodiments.

[0350] The battery device 100 provides electrical energy for the operation of the electrical device.

[0351] The battery device 100 provided in any of the above embodiments has good reliability, which is beneficial to improving the power supply reliability of electrical equipment powered by the battery device 100.

[0352] This application provides a battery device 100, which includes a housing 10 and a plurality of battery components 20, which are housed within the housing 10. Each battery component 20 includes a casing 21 and a plurality of solid-state batteries 22. The casing 21 has a sealed space 211, in which the plurality of solid-state batteries 22 are housed and arranged along a first direction X. The casing 21 includes a first wall 213, a second wall 214, a third wall 215, a fourth wall 216, a fifth wall 217, and a sixth wall 218. The first wall 213 and the second wall 214 are arranged along the first direction X, the third wall 215 and the fourth wall 216 are arranged opposite each other along a second direction Y, and the fifth wall 217 and the sixth wall 218 are arranged opposite each other along a third direction Z. The solid-state battery 22 includes an electrode assembly 221, a package 222, a first tab 223a, and a second tab 223b. The electrode assembly 221 is housed within the package 222. The electrode assembly 221 includes a positive electrode layer 2211, a solid electrolyte 2212, and a negative electrode layer 2213 stacked along a first direction X. The first tab 223a and the second tab 223b are respectively connected to the positive electrode layer 2211 and the negative electrode layer 2213 and extend out of the package 222. The first tab 223a and the second tab 223b are located at the end of the solid-state battery 22 along a third direction Z, near the fifth wall 217. The first wall 213 and the second wall 214 cooperate to clamp the solid-state battery 22 along the first direction X.

[0353] The battery assembly 20 also includes a circuit board 25, which is disposed at one end of the solid-state battery 22 along the third direction Z and near the first tab 223a and the second tab 223b. The circuit board 25 includes a first lead 251 and a second lead 252, both of which are electrically connected to the solid-state battery 22.

[0354] In some embodiments, the third wall 215 connects the first wall 213 and the second wall 214 to form a first opening Q1 along the second direction Y and a second opening Q2 and a third opening Q3 along the third direction Z. The first opening Q1 allows the solid-state battery 22 to enter the housing 21a. The fourth wall 216 closes the first opening Q1. The fifth wall 217 and the sixth wall 218 close the second opening Q2 and the third opening Q3, respectively. The fifth wall 217 forms a first output portion 20a and a second output portion 20b. The first lead-out portion 251 and the second lead-out portion 252 are both connected to the first output portion 20a and the second output portion 20b.

[0355] In some embodiments, the first wall 213, together with the third wall 215 and the fourth wall 216, forms a first opening Q1 along the first direction X and a second opening Q2 and a third opening Q3 along the third direction Z. The first opening Q1 allows the solid-state battery 22 to enter the housing 21a. The second wall 214 closes the first opening Q1. The fifth wall 217 and the sixth wall 218 respectively close the second opening Q2 and the third opening Q3. The fifth wall 217 forms a first output portion 20a and a second output portion 20b. The first lead-out portion 251 and the second lead-out portion 252 are both connected to the first output portion 20a and the second output portion 20b.

[0356] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0357] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, comprising: Box; Multiple battery components are housed within the housing; The battery assembly includes a housing and a plurality of solid-state batteries. The housing has a first output section and a second output section with opposite polarities. Both the first output section and the second output section are electrically connected to the solid-state batteries. The housing has a sealed space in which the plurality of solid-state batteries are housed.

2. The battery device as claimed in claim 1, wherein, The battery device further includes a circuit board, and the plurality of solid-state batteries are electrically connected to the circuit board, with at least a portion of the circuit board disposed within the sealed space; The first output section includes a first body, and the second output section includes a second body. Both the first body and the second body are disposed in the housing. The circuit board includes a first lead-out section and a second lead-out section. The first lead-out section and the second lead-out section pass through the housing and are respectively connected to the first body and the second body to form the first output section and the second output section. The first lead-out section is sealed to the housing, and the second lead-out section is sealed to the housing.

3. The battery device as claimed in claim 2, wherein, The circuit board also includes a data acquisition component for acquiring information from the solid-state battery. The data acquisition component includes a connection terminal for connecting to a component located outside the housing. The connection terminal passes through the housing and is sealed to the housing.

4. The battery device as claimed in claim 2 or 3, wherein, Both the first body and the second body protrude from the outer surface of the outer shell. A first space is formed inside the first body, and a second space is formed inside the second body. The first lead-out portion and the second lead-out portion pass through the outer shell and are respectively inserted into the first space and the second space.

5. The battery device as claimed in claim 4, wherein, The first body has a first clearance portion that communicates with the first space and is configured to expose the first lead-out portion in the first space. The second body has a second clearance portion that communicates with the second space and is configured to expose the second lead-out portion in the second space.

6. The battery device as claimed in claim 5, wherein, The first body is made of insulating material, and the second body is made of insulating material.

7. The battery device according to any one of claims 2-6, wherein, The solid-state battery has two tabs with opposite polarities; The circuit board also includes a board body and a plurality of conductive components. The first lead-out portion, the second lead-out portion, and the conductive components are all disposed on the board body. Two of the plurality of conductive components are respectively connected to the first lead-out portion and the second lead-out portion. One tab portion of one solid-state battery and one tab portion of another solid-state battery are each connected to one of the conductive components.

8. The battery device as claimed in claim 7, wherein, The solid-state battery and the conductive component are located on opposite sides of the plate body, respectively. The plate body is provided with an insertion hole that penetrates both sides of the plate body in the thickness direction. The electrode tab passes through the insertion hole and extends to the side of the conductive element away from the plate body, and is connected to the conductive element.

9. The battery device according to any one of claims 1-8, wherein, The solid-state battery includes an electrode assembly that is not encapsulated and is directly housed within the housing. The electrode assembly includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked along a first direction. Along the first direction, at least a portion of the solid electrolyte layer is located between the positive electrode layer and the negative electrode layer.

10. The battery device according to any one of claims 1-8, wherein, The solid-state battery includes a package and an electrode assembly, the electrode assembly being housed within the package, the electrode assembly including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked along a first direction, wherein at least a portion of the solid electrolyte layer is located between the positive electrode layer and the negative electrode layer along the first direction.

11. The battery device as claimed in claim 9 or 10, wherein, The housing includes a first wall and a second wall disposed opposite to each other along the first direction, the first wall and the second wall being configured to cooperate in clamping a plurality of the solid-state batteries.

12. The battery device of claim 11, wherein, The housing also includes a third wall and a fourth wall opposite each other along a second direction, the third wall and the fourth wall being connected to the first wall and the second wall, and the third wall and the fourth wall being configured to cooperate in clamping a plurality of the solid-state batteries; The outer shell's dimension along a third direction is greater than its dimension along a first direction, and the outer shell's dimension along the third direction is greater than its dimension along a second direction. The first direction, the second direction, and the third direction are perpendicular to each other.

13. The battery device as claimed in claim 11 or 12, wherein, The housing also includes a third wall and a fourth wall opposite each other along a second direction, the third wall connecting the first wall and the second wall to form a housing having a first opening in the second direction, and the fourth wall closing the first opening; The outer shell's dimension along a third direction is greater than its dimension along a first direction, and the outer shell's dimension along the third direction is greater than its dimension along a second direction. The first direction, the second direction, and the third direction are perpendicular to each other.

14. The battery device of claim 13, wherein, Along the second direction, the fourth wall has a first abutting surface facing the third wall. The end of the first wall facing away from the third wall and the end of the second wall facing away from the third wall both abut against the first abutting surface. The first abutting surface is provided with a first abutting portion. Along the first direction, the two ends of the first abutting portion contact the first wall and the second wall respectively.

15. The battery device as claimed in claim 13 or 14, wherein, The first wall, the second wall, and the third wall are integrally formed.

16. The battery device according to any one of claims 13-15, wherein, Both the first wall and the second wall are welded to the fourth wall.

17. The battery device as claimed in claim 11 or 12, wherein, The housing also includes a third wall and a fourth wall opposite each other in a second direction, the first wall connecting the third wall and the fourth wall to form a housing having a first opening in a first direction, and the second wall closing the first opening; Wherein, the dimension of the outer shell along a third direction is greater than the dimension of the outer shell along a first direction, the dimension of the outer shell along the third direction is greater than the dimension of the outer shell along a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

18. The battery device of claim 17, wherein, Along the first direction, the second wall has a second abutting surface facing the first wall. The end of the third wall away from the first wall and the end of the fourth wall away from the first wall both abut against the second abutting surface. The second abutting surface is provided with a second abutting portion. Along the first direction, the two ends of the second abutting portion contact the third wall and the fourth wall respectively.

19. The battery device as claimed in claim 17 or 18, wherein, The first wall, the third wall, and the fourth wall are integrally formed.

20. The battery device according to any one of claims 17-19, wherein, Both the third wall and the fourth wall are welded to the second wall.

21. The battery device according to any one of claims 13-20, wherein, Along a third direction, the housing has opposing second and third openings, and the outer shell further includes a fifth wall and a sixth wall, the fifth wall and the sixth wall respectively closing the second opening and the third opening; The first output section and the second output section are formed on the fifth wall; or, the The first output section and the second output section are formed on the fifth wall and the sixth wall respectively, and the first direction, the second direction and the third direction are perpendicular to each other.

22. The battery device of claim 21, wherein, The solid-state battery has a first tab and a second tab, which are located at the ends of the solid-state battery along a third direction. The first tab and the second tab are respectively connected to the first output and the second output.

23. The battery device according to any one of claims 12-22, wherein, At least one of the third wall and the fourth wall is the wall with the largest outer surface area of ​​the outer shell.

24. The battery device according to any one of claims 12-23, wherein, The dimension of the outer casing along the second direction is smaller than the dimension of the outer casing along the first direction.

25. The battery device according to any one of claims 9-24, wherein, In each of the battery modules, a plurality of solid-state batteries are arranged along the first direction.

26. The battery device according to any one of claims 9-25, wherein, The electrode assembly includes a positive electrode and a negative electrode, which are stacked along the first direction, and a solid electrolyte layer is disposed between adjacent positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer, with the positive active material layer disposed on at least one side of the positive current collector; the negative electrode includes a negative current collector and a negative active material layer, with the negative active material layer disposed on at least one side of the negative current collector, one positive active material layer forming one positive electrode layer, and one negative active material layer forming one negative electrode layer.

27. The battery device according to any one of claims 9-25, wherein, The electrode assembly includes multiple electrodes, which are stacked along the first direction, and a solid electrolyte layer is disposed between two adjacent electrodes. The electrode includes a composite current collector, a positive active material layer, and a negative active material layer. The composite current collector includes a first conductive layer, an insulating layer, and a second conductive layer stacked sequentially. The positive active material layer is disposed on the surface of the first conductive layer facing away from the insulating layer, and the negative active material layer is disposed on the surface of the second conductive layer facing away from the insulating layer. The positive active material layer of one of two adjacent electrode sheets forms a positive electrode layer, and the negative active material layer of the other of two adjacent electrode sheets forms a negative electrode layer.

28. The battery device according to any one of claims 1-27, wherein, The enclosure includes a first enclosure and a second enclosure, which together define a space for accommodating multiple battery components. The first enclosure has a first sealing surface, and the second enclosure has a second sealing surface, which are sealed together.

29. The battery device according to any one of claims 1-28, wherein, The outer casing is made of one or more materials, including aluminum and steel.

30. The battery device according to any one of claims 1-29, wherein, The housing is also provided with a pressure relief component, which is used to release the pressure inside the battery assembly.

31. The battery device of claim 30, wherein, The housing includes a fifth wall and a sixth wall opposite to each other, and the first output portion and the second output portion are formed on the fifth wall; or, the first output portion and the second output portion are formed on the fifth wall and the sixth wall respectively; The pressure relief component is located on the fifth wall or the sixth wall.

32. The battery device according to any one of claims 1-31, wherein, The battery assembly also includes a fixing part, which is disposed on the outer casing and connected to the housing.

33. The battery device of claim 32, wherein, The box is equipped with a partition beam, which is used to divide the internal space of the box into multiple sub-spaces, and the fixing part is connected to the partition beam.

34. The battery device according to any one of claims 1-33, wherein, The housing is provided with a detection port, which is configured to allow detection gas to enter the housing. The battery assembly also includes a seal that seals the detection port.

35. An electrical device comprising a battery device as described in any one of claims 1-34.

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