Battery pack, battery device, and electric device

Abstract

The present application relates to the field of batteries. Provided are a battery pack, a battery device, and an electric device. The battery pack comprises a housing and a plurality of electrode assemblies, wherein the plurality of electrode assemblies are stacked and electrically connected, and each electrode assembly is a solid-state electrode assembly. The housing has a sealed space, and the plurality of electrode assemblies are accommodated within the sealed space. The electrode assemblies of the battery pack are solid-state electrode assemblies, and each solid-state electrode assembly comprises a solid-state electrolyte layer that may generate a harmful gas during use. The housing has the sealed space and the plurality of electrode assemblies are accommodated in the sealed space, that is, the housing seals the plurality of electrode assemblies, such that the generated harmful gas can be sealed within the housing, thereby reducing the risk of harmful gas leakage and the risk of harm to human health, and helping to improve the reliability of the battery pack.

Description

Battery packs, battery devices and electrical appliances Technical Field

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

[0002] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate, as well as battery reliability. However, the reliability of batteries currently needs further improvement. Summary of the Invention

[0003] This application provides a battery pack, a battery device, and an electrical device that can improve battery reliability.

[0004] In a first aspect, embodiments of this application provide a battery pack, the battery pack including a housing and a plurality of electrode assemblies, the plurality of electrode assemblies being stacked and electrically connected, and each of the electrode assemblies being a solid-state electrode assembly; the housing having a sealed space, the plurality of electrode assemblies being housed within the sealed space.

[0005] In the above technical solution, the electrode assembly of the battery pack is a solid electrode assembly, which includes a solid electrolyte layer. During use, harmful gases are generated. By making the outer shell have a sealed space, multiple electrode assemblies are housed in the sealed space. That is, the outer shell seals multiple electrode assemblies. In this way, the generated harmful gases can be sealed inside the outer shell, reducing the risk of harmful gas leakage and the risk of harmful gases harming human health, which is conducive to improving the reliability of the battery pack.

[0006] As an optional technical solution in this application embodiment, the battery pack includes a circuit board, which is at least partially housed within the housing. The circuit board includes a data acquisition component, which is electrically connected to a plurality of electrode components and is used to acquire information from the electrode components.

[0007] In the above technical solution, information about the electrode assembly is collected by setting up a data acquisition component, which facilitates the evaluation of the state of the electrode assembly based on the collected information, and realizes intelligent management and optimized control of the electrode assembly, which is beneficial to improving the efficiency, reliability and lifespan of the battery pack.

[0008] As an optional technical solution in this application embodiment, the acquisition component includes a connector for electrical connection with an external component; the housing includes a first wall, a portion of the circuit board is disposed between the first wall and the electrode assembly, the first wall is provided with a first lead-out hole, the connector extends out of the housing from the first lead-out hole, and the connector is sealed to the first wall.

[0009] In the above technical solution, the connector extends from the outer shell through the first lead-out hole, thereby facilitating electrical connection between the connector and external components to transmit the information collected by the acquisition component to the external components. By sealing the connector with the first wall, the risk of harmful gas leakage is reduced, thus lowering the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack.

[0010] As an optional technical solution in this application embodiment, the battery pack includes a first seal, which is disposed around the first lead hole, and is used to seal the connector and the first wall portion.

[0011] In the above technical solution, the first sealing element is arranged around the first lead hole. Since the connector extends out of the housing from the first lead hole, the first sealing element is also arranged around the connector. The first sealing element can abut between the circuit board and the first wall, thereby sealing the connector and the first wall, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0012] As an optional technical solution in this application embodiment, the circuit board includes a bus assembly, which is electrically connected to a plurality of electrode assemblies. The bus assembly includes a first lead-out portion and a second lead-out portion, the first lead-out portion and the second lead-out portion having opposite polarities. The housing includes a first wall portion, a portion of the circuit board is disposed between the first wall portion and the electrode assemblies, the first wall portion is provided with a second lead-out hole and a third lead-out hole, the first lead-out portion extends out of the housing from the second lead-out hole and is sealed to the first wall portion, and the second lead-out portion extends out of the housing from the third lead-out hole and is sealed to the first wall portion.

[0013] In the above technical solution, multiple electrode components are electrically connected by a busbar assembly, thereby achieving the convergence of current through these components. One of the first lead-out portion and the second lead-out portion serves as the positive output terminal of the battery pack, and the other serves as the negative output terminal. The first lead-out portion extends from the second lead-out hole into the outer casing, and the second lead-out portion extends from the third lead-out hole into the outer casing, facilitating connection with external electrical connection components and enabling the output or input of electrical energy into the battery pack. The first lead-out portion is sealed to the first wall portion, thereby sealing both the first lead-out portion and the first wall portion, and the second lead-out portion is sealed to the first wall portion, thereby sealing both the second lead-out portion and the first wall portion. This reduces the risk of harmful gas leakage and improves the reliability of the battery pack.

[0014] As an optional technical solution in this application embodiment, the battery pack includes a second sealing member, which is disposed around the second lead-out hole and is used to seal the first lead-out portion and the first wall portion; and / or the battery pack includes a third sealing member, which is disposed around the third lead-out hole and is used to seal the second lead-out portion and the first wall portion.

[0015] In the above technical solution, the second seal is arranged around the second lead-out hole. Since the first lead-out portion extends from the outer casing through the second lead-out hole, the second seal is also arranged around the first lead-out portion. The second seal can abut against the circuit board and the first wall portion, thereby sealing the first lead-out portion and the first wall portion. This helps reduce the risk of harmful gas leakage and improves the reliability of the battery pack. Similarly, the third seal is arranged around the third lead-out hole. Since the second lead-out portion extends from the outer casing through the third lead-out hole, the third seal is also arranged around the second lead-out portion. The third seal can abut against the circuit board and the first wall portion, thereby sealing the second lead-out portion and the first wall portion. This also helps reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0016] As an optional technical solution in this application embodiment, the battery pack includes a first insulating member disposed between the first lead-out portion and the hole wall surface of the second lead-out hole; and / or the battery pack includes a second insulating member disposed between the second lead-out portion and the hole wall surface of the third lead-out hole.

[0017] In the above technical solution, by providing a first insulating component, the risk of short circuit due to contact between the wall surfaces of the first lead and the second lead is reduced, which helps improve the reliability of the battery pack. Similarly, by providing a second insulating component, the risk of short circuit due to contact between the wall surfaces of the second lead and the third lead is reduced, which also helps improve the reliability of the battery pack.

[0018] As an optional technical solution in this application embodiment, the battery pack includes a locking accessory, which is configured to lock the circuit board and the first wall portion.

[0019] In the above technical solution, by setting a locking attachment, the circuit board is locked to the first wall, thereby positioning the circuit board, reducing the risk of the circuit board shaking during the use of the battery pack, and helping to maintain a stable connection between the circuit board and the electrode assembly or other electrical connection components.

[0020] As an optional technical solution in this application embodiment, the electrode assembly includes a solid electrolyte layer and a plurality of electrodes. Along a first direction, the solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layer facing the solid electrolyte layer located between the two adjacent electrodes has opposite polarities. The outer shell includes a second wall portion and a third wall portion. Along the first direction, the second wall portion and the third wall portion are disposed opposite to each other, and the second wall portion and the third wall portion cooperate to press the plurality of electrode assemblies.

[0021] In the above technical solution, the second wall portion and the third wall portion cooperate to compress the electrode assembly along the first direction, thereby pressing the solid electrolyte layer and multiple electrode sheets together, so that the electrode sheets and the solid electrolyte layer can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack.

[0022] As an optional technical solution in this application embodiment, the plurality of electrode components are arranged along the first direction.

[0023] In the above technical solution, by arranging multiple electrode components along a first direction, that is, arranging multiple electrode components in the same direction as arranging multiple electrode sheets and solid electrolyte layers, the second wall portion and the third wall portion can cooperate to compress multiple electrode components along the first direction, thereby pressing the electrode sheets and solid electrolyte layers of multiple electrode components together, which facilitates ion transport and reduces the internal resistance of the battery pack.

[0024] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a second direction, the third wall portion connects the fourth wall portion and the fifth wall portion, the third wall portion, the fourth wall portion and the fifth wall portion are integrally formed to form a shell having a first opening in the first direction, the second wall portion closes the first opening, and the second direction is perpendicular to the first direction.

[0025] In the above technical solution, the third, fourth, and fifth walls are integrally formed to create the housing, while the second wall is separately disposed and connected to the housing. During assembly, multiple electrode assemblies can be first housed within the housing, then the second wall presses the multiple electrode assemblies against the third wall along the first direction, and finally the second wall is connected to the housing. This allows the second and third walls to easily cooperate and press together to compress multiple electrode assemblies during assembly.

[0026] As an optional technical solution in this application embodiment, along a third direction, the housing has a second opening and a third opening that are disposed opposite to each other, and the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; the size of the outer shell along the first direction and the size of the outer shell along the second direction are both smaller than the size of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] In the above technical solution, during assembly, multiple electrode assemblies can be inserted into the housing through the first opening. Since the dimensions of the housing along the first direction and the second direction are both smaller than the dimensions of the housing along the third direction, the distance that the multiple electrode assemblies need to move to be inserted into the housing through the first opening is relatively short, making assembly simpler and more convenient.

[0028] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a second direction, the fourth wall portion connects the second wall portion and the third wall portion, the second wall portion, the third wall portion and the fourth wall portion are integrally formed to form a shell having a fourth opening in the second direction, and the fifth wall portion closes the fourth opening; the dimension of the outer shell along the second direction is smaller than the dimension of the outer shell along the first direction, and the second direction is perpendicular to the first direction.

[0029] In the above technical solution, the second wall, the third wall and the fourth wall are integrally formed to form the shell, and the fifth wall is separately set and connected to the shell. During assembly, multiple electrode assemblies can be inserted into the shell through the fourth opening first, and then the fifth wall is connected to the shell. Since the size of the shell along the second direction is smaller than the size of the shell along the first direction, the distance that multiple electrode assemblies need to move to be inserted into the shell through the fourth opening is relatively short, and the assembly is simpler and more convenient.

[0030] As an optional technical solution in this application embodiment, along a third direction, the housing has a second opening and a third opening that are disposed opposite to each other, and the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; the size of the outer shell along the first direction is smaller than the size of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0031] In the above technical solution, the size of the shell along the second direction is smaller than the size of the shell along the first direction, and the size of the shell along the first direction is smaller than the size of the shell along the third direction. Therefore, the size of the shell along the second direction is the smallest. During assembly, multiple electrode components can be inserted into the shell through the fourth opening. Since the size of the shell along the second direction is the smallest, the distance that multiple electrode components need to move to be inserted into the shell through the fourth opening is the shortest, making assembly simpler and more convenient.

[0032] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a second direction, the second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are connected end to end in sequence, and the second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are integrally formed to form a shell having a second opening and a third opening in a third direction; the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively close the second opening and the third opening, and the first direction, the second direction and the third direction are perpendicular to each other.

[0033] In the above technical solution, the second wall, the fourth wall, the third wall and the fifth wall are integrally formed to form a shell. During assembly, multiple electrode components can be inserted into the shell through the second opening or the third opening. Then, the second opening is closed by the first wall and the third opening is closed by the sixth wall. The assembly steps are fewer and the assembly efficiency is higher.

[0034] As an optional technical solution in this application embodiment, the electrode assembly is not encapsulated and is directly housed within the housing.

[0035] In the above technical solution, since the outer casing has a sealed space that protects the electrode assembly, it is not necessary to encapsulate the electrode assembly; it can be directly housed within the casing. This eliminates the need for a separate encapsulation bag for the electrode assembly, reducing the space occupied within the casing and thus improving the energy density of the battery pack.

[0036] As an optional technical solution in this application embodiment, a third insulating member is provided between the electrode assembly and the housing, and the third insulating member is used to insulate and isolate the electrode assembly and the housing.

[0037] In the above technical solution, by setting a third insulating component between the electrode assembly and the housing, the third insulating component can insulate and isolate the electrode assembly and the housing, reducing the risk of short circuit due to contact between the electrode assembly and the housing, which is beneficial to improving the reliability of the battery pack.

[0038] As an optional technical solution in this application embodiment, a plurality of electrode assemblies are arranged along a first direction, and a separator is provided between two adjacent electrode assemblies along the first direction.

[0039] In the above technical solution, by setting a separator to separate two adjacent electrode components, when one electrode component is damaged, it is not easy to affect the use of other electrode components, which helps to improve the reliability of the battery pack.

[0040] As an optional technical solution in this application embodiment, the battery pack includes a plurality of encapsulation bags, each of the encapsulation bags encapsulating at least one of the electrode components, and the encapsulation bags are housed within the outer casing.

[0041] In the above technical solution, after the electrode assembly is encapsulated in packaging bags, multiple packaging bags are then housed within the outer casing. On one hand, the packaging bags provide insulation, reducing the risk of short circuits caused by contact between the electrode assembly and the outer casing. On the other hand, any harmful gases produced can be sealed within the packaging bags, further reducing the risk of leakage and harm to human health, thus improving the reliability of the battery pack.

[0042] As an optional technical solution in this application embodiment, a plurality of the packaging bags are arranged along a first direction, and a separator is provided between two adjacent packaging bags along the first direction.

[0043] In the above technical solution, by setting a separator to separate two adjacent packaging bags, when the electrode assembly in one packaging bag is damaged, it is not easy to affect the use of the electrode assembly in other packaging bags, which helps to improve the reliability of the battery pack.

[0044] As an optional technical solution in this application embodiment, the separator is made of heat-insulating material.

[0045] In the above technical solution, the separator is a heat insulation material. When the heat of one electrode assembly exceeds the threshold, the separator can play a heat insulation role, preventing heat from being conducted to other electrode assemblies, which helps to reduce the risk of damage to other electrode assemblies.

[0046] As an optional technical solution in this application embodiment, the electrode assembly includes a solid electrolyte layer and a plurality of electrodes. The solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layer facing the solid electrolyte layer located between the two adjacent electrodes has opposite polarities.

[0047] In the above technical solution, in two adjacent electrodes, the polarity of the active material layer facing the solid electrolyte layer between the two adjacent electrodes is opposite, and the polarity of the two active material layers adjacent to the solid electrolyte layer and located on both sides of the solid electrolyte layer is opposite. The solid electrolyte layer simultaneously plays the role of transporting ions and isolating the positive electrode active material layer and the negative electrode active material layer.

[0048] As an optional technical solution in this application embodiment, the plurality of electrode sheets include a first electrode sheet and a second electrode sheet, the first electrode sheet and the second electrode sheet having opposite polarities, the first electrode sheet, the solid electrolyte layer and the second electrode sheet being stacked, and the solid electrolyte layer being disposed between the first electrode sheet and the second electrode sheet.

[0049] In the above technical solution, the electrode assembly includes a first electrode, a solid electrolyte layer and a second electrode stacked together. In this way, the electrode assembly is simple and convenient to manufacture and has a low cost.

[0050] As an optional technical solution in this application embodiment, the electrode includes a current collector, a first active material layer and a second active material layer, wherein the first active material layer and the second active material layer have opposite polarities, and the first active material layer and the second active material layer are respectively disposed on both sides of the current collector.

[0051] In the above technical solution, by making the electrode sheet include a current collector, a first active material layer and a second active material layer, with the first active material layer and the second active material layer having opposite polarities, it is beneficial to make the battery pack have a higher energy density.

[0052] As an optional technical solution in this application embodiment, the electrode assembly includes a solid electrolyte layer, and the solid electrolyte layer includes sulfides.

[0053] In the above technical solution, when the solid electrolyte layer includes sulfides, the electrode assembly will generate hydrogen sulfide during use. Hydrogen sulfide is very harmful to human health, so it is even more necessary to seal it with an outer shell.

[0054] Secondly, embodiments of this application also provide a battery device, the battery device including a housing and a plurality of the above-described battery packs, the plurality of battery packs being housed within the housing.

[0055] As an optional technical solution in this application embodiment, the outer shell is connected to the box body.

[0056] In the above technical solution, by connecting the outer shell to the housing and limiting the outer shell, it is beneficial to reduce the risk of battery pack shaking during the use of the battery device, to maintain a stable connection between the battery pack and other electrical connection components, and to improve the reliability of the battery device.

[0057] Thirdly, embodiments of this application also provide an electrical device, which includes the aforementioned battery pack. Attached Figure Description

[0058] 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.

[0059] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0060] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0061] Figure 3 is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0062] Figure 4 is an exploded view of a battery pack provided in some embodiments of this application;

[0063] Figure 5 is a cross-sectional view of an electrode assembly provided in some embodiments of this application;

[0064] Figure 6 is an exploded view of a circuit board and a first wall portion provided in some embodiments of this application;

[0065] Figure 7 is an exploded view of the second wall and the shell provided in some embodiments of this application;

[0066] Figure 8 is an exploded view of a battery pack provided in some other embodiments of this application;

[0067] Figure 9 is an exploded view of the fifth wall and the shell provided in some other embodiments of this application;

[0068] Figure 10 is an exploded view of a battery pack provided in some embodiments of this application;

[0069] Figure 11 is a cross-sectional view of a battery pack provided in some embodiments of this application;

[0070] Figure 12 is a cross-sectional view of a battery pack provided in some other embodiments of this application;

[0071] Figure 13 is a cross-sectional view of an electrode assembly provided in some other embodiments of this application.

[0072] Icons: 10-Box; 11-First Part; 12-Second Part; 20-Battery Pack; 21-Casing; 211-First Wall; 2111-First Outlet Hole; 2112-Second Outlet Hole; 2113-Third Outlet Hole; 2114-First Mounting Hole; 2115-Second Mounting Hole; 2116-Third Mounting Hole; 212-Second Wall; 213-Casing; 2131-Third Wall; 2132-Fourth Wall; 2133-Fifth Wall; 2134-First Opening; 2135-Second Opening; 2136-Third Opening; 2137-Fourth Opening; 214-Sixth Wall; 22-Electrode Assembly; 221-Electrode; 2211-First Electrode; 2212-Second Electrode; 2213-Current Collector; 2214-First Active Material layer; 2215-Second active material layer; 222-Solid electrolyte layer; 23-Circuit board; 231-Collection component; 2311-Connector; 2312-First seal; 232-Bucket assembly; 2321-First lead-out; 2322-Second lead-out; 2323-First busbar; 2324-Second busbar; 2325-Second seal; 2326-Third seal; 2327-First insulator; 2328-Second insulator; 24-Mounting structure; 25-Lock accessory; 251-First lock accessory; 252-Second lock accessory; 253-Third lock accessory; 26-Third insulator; 27-Separator; 28-Encapsulation bag; 100-Battery device; 200-Controller; 300-Motor; 1000-Vehicle. Detailed Implementation

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] In this application, "multiple" means two or more (including two).

[0080] A battery pack typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process, active ions shuttle between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0081] 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.

[0082] 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.

[0083] 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.).

[0084] 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 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 Mn0.2 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.

[0085] 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.

[0086] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0087] 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.

[0088] As an example, the negative electrode active material may be a negative electrode active material known in the art. 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 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0090] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0091] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0092] 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.

[0093] 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.

[0094] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0095] In some implementations, the electrode assembly is a stacked structure.

[0096] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0097] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0098] 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.

[0099] In some implementations, the battery pack may include a housing. The housing is used to seal components such as electrode assemblies. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0100] The battery apparatus mentioned in the embodiments of this application may include multiple battery packs to provide higher voltage and capacity, and the multiple battery packs are connected in series, parallel or mixed via a busbar.

[0101] In some embodiments, the battery device may be a battery pack, which may include a housing and multiple battery packs housed within the housing.

[0102] As an example, the battery pack can be housed in a casing in a way that is fixed within the casing.

[0103] As an example, the enclosure may include a first part and a second part. The first and second parts are fastened together to form a closed space inside the enclosure for housing the battery pack. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first part may be a top cover or a bottom plate.

[0104] 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 pack.

[0105] 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.

[0106] 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.

[0107] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0108] The development of battery technology requires consideration of multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, battery reliability must be taken into account. However, current battery reliability needs further improvement.

[0109] Solid-state batteries boast high energy density, and their application in new energy vehicles will significantly improve their range. However, solid-state batteries produce harmful gases during operation, which can easily leak and endanger human health. Therefore, the reliability of these batteries currently needs further improvement.

[0110] Therefore, this application provides a battery pack, which includes a housing and multiple electrode assemblies. The electrode assemblies are stacked and electrically connected, and each electrode assembly is a solid-state electrode assembly. The housing has a sealed space, within which the multiple electrode assemblies are housed.

[0111] The electrode assembly of this battery pack is a solid-state electrode assembly, which includes a solid electrolyte layer. During use, it will generate harmful gases. By making the outer casing have a sealed space, multiple electrode assemblies are housed in the sealed space. In other words, the outer casing seals multiple electrode assemblies. In this way, the generated harmful gases can be sealed inside the outer casing, reducing the risk of harmful gas leakage and the risk of harmful gases posing a threat to human health, which is conducive to improving the reliability of the battery pack.

[0112] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery packs and 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.

[0113] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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 plurality of battery packs 20, wherein the housing 10 is used to accommodate the plurality of battery packs 20.

[0118] The housing 10 has an enclosed space inside for accommodating the battery pack 20. The housing 10 can have various structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, which are interlocked. The first part 11 and the second part 12 can have various shapes, such as a cuboid or a cylinder. The first part 11 can be a hollow structure open on one side, and the second part 12 can also be a hollow structure open on one side. The open side of the second part 12 interlocks with the open side of the first part 11, thus forming a housing 10 with an enclosed space. Alternatively, the first part 11 can be a hollow structure open on one side, and the second part 12 can be a plate-like structure, with the second part 12 interlocking with the open side of the first part 11, thus forming a housing 10 with an accommodating space.

[0119] In the battery device 100, there are multiple battery packs 20. These battery packs 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that the multiple battery packs 20 are connected in both series and parallel. All the battery packs 20 are directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of all the battery packs 20 is housed within the housing 10.

[0120] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery packs 20 can be electrically connected to each other, enabling series, parallel, or mixed connection of the multiple battery packs 20. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0121] Please refer to Figures 3, 4, and 5. Figure 3 is a schematic diagram of the structure of a battery pack 20 provided in some embodiments of this application. Figure 4 is an exploded view of a battery pack 20 provided in some embodiments of this application. Figure 5 is a cross-sectional view of an electrode assembly 22 provided in some embodiments of this application. This application provides a battery pack 20, which includes a housing 21 and multiple electrode assemblies 22. The multiple electrode assemblies 22 are stacked and electrically connected, and each electrode assembly 22 is a solid-state electrode assembly. The housing 21 has a sealed space, within which the multiple electrode assemblies 22 are housed.

[0122] The battery pack 20 is similar to a battery module, except that the outer casing 21 of the battery pack 20 forms a sealed space. The outer casing 21 of the battery pack 20 seals multiple electrode components 22, and the multiple electrode components 22 can be directly housed in the outer casing 21 without encapsulation.

[0123] The outer casing 21 can be made of a material with a certain degree of hardness and strength (such as metal), so that the outer casing 21 is not easily deformed when subjected to compression and impact, enabling the battery pack 20 to have higher structural strength and improved reliability. The material of the outer casing 21 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0124] The battery pack 20 may include several or dozens of electrode components 22. Of course, the battery pack 20 may also include more electrode components 22, with multiple electrode components 22 stacked and electrically connected.

[0125] Electrode assembly 22 is a component in battery pack 20 where electrochemical reactions occur. Multiple electrode assemblies 22 may be contained within the casing 21. Each electrode assembly 22 includes multiple electrodes 221 and a solid electrolyte layer 222. The solid electrolyte layer 222 is positioned between two adjacent electrodes 221. Each electrode 221 includes an active material layer, and in adjacent electrodes 221, the active material layers facing the solid electrolyte layer 222 located between the adjacent electrodes have opposite polarities.

[0126] In some embodiments, a plurality of electrodes 221 include positive and negative electrodes, and the positive electrode, solid electrolyte layer 222, and negative electrode are stacked to form an electrode assembly 22. The portions of the positive and negative electrodes having active material constitute the main body of the electrode assembly 22, and the portions of the positive and negative electrodes not having active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body.

[0127] In other embodiments, the electrode 221 includes a current collector 2213, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector 2213. A solid electrolyte layer 222 and multiple electrodes 221 are stacked to form an electrode assembly 22.

[0128] The solid electrolyte layer 222 includes a polymer solid electrolyte layer, an inorganic solid electrolyte layer, and a composite solid electrolyte layer.

[0129] As an example, the polymer solid electrolyte layer can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid-lithium salt, cellulose, etc.

[0130] As an example, the inorganic solid electrolyte layer 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 phosphorus sulfide, silver germanium sulfide), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0131] As an example, a composite solid electrolyte layer is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0132] The electrode assembly 22 of the battery pack 20 is a solid electrode assembly, which includes a solid electrolyte layer 222. During use, it will generate harmful gases. By making the outer casing 21 have a sealed space, multiple electrode assemblies 22 are housed in the sealed space. That is, the outer casing 21 seals multiple electrode assemblies 22. In this way, the generated harmful gases can be sealed inside the outer casing 21, reducing the risk of harmful gas leakage and the risk of harmful gases harming human health, which is conducive to improving the reliability of the battery pack 20.

[0133] Please refer to Figures 3, 4, 5, and 6. Figure 6 is an exploded view of the circuit board 23 and the first wall portion 211 provided in some embodiments of this application. In some embodiments, the battery pack 20 includes the circuit board 23, which is at least partially housed within the housing 21. The circuit board 23 includes a data acquisition component 231, which is electrically connected to a plurality of electrode components 22 and is used to acquire information from the electrode components 22.

[0134] The circuit board 23 may include a wire harness isolation plate and other electrical connection structures. The wire harness isolation plate can protect and isolate the wire harness in the battery pack 20, reducing the risk of damage to the battery pack 20 due to short circuit or failure of the wire harness.

[0135] The electrical connection structure may include a data acquisition component 231, which is electrically connected to multiple electrode components 22. The data acquisition component 231 is used to acquire information from the multiple electrode components 22. The information acquired by the data acquisition component 231 includes voltage, current, temperature, etc.

[0136] The circuit board 23 may be partially or wholly housed within the housing 21. For example, the main body of the circuit board 23 may be housed within the housing 21, and the interface on the circuit board 23 may extend out of the housing 21 to facilitate electrical connection with other electrical connection components.

[0137] By setting up the acquisition component 231 to collect information from the electrode assembly 22, it is easier to evaluate the status of the electrode assembly 22 based on the collected information, realize intelligent management and optimized control of the electrode assembly 22, and improve the efficiency, reliability and lifespan of the battery pack 20.

[0138] Referring to Figures 3, 4, 5, and 6, in some embodiments, the acquisition component 231 includes a connector 2311 for electrical connection with an external component. The housing 21 includes a first wall 211, a portion of the circuit board 23 is disposed between the first wall 211 and the electrode assembly 22, the first wall 211 has a first lead-out hole 2111, and the connector 2311 extends out of the housing 21 from the first lead-out hole 2111. The connector 2311 is sealingly connected to the first wall 211.

[0139] The data acquisition component 231 may include a data acquisition line and a connector 2311. The data acquisition line electrically connects multiple electrode assemblies 22 and the connector 2311. The connector 2311 can collect the data acquired by the data acquisition line and is used for electrical connection with an external component, thereby transferring the collected data to the external component. It should be noted that the external component is located outside the housing 21. For example, the external component may be a battery management system.

[0140] The first wall portion 211 can be any wall portion of the outer casing 21. A first lead-out hole 2111 is provided on the first wall portion 2111, which is a through hole extending through the first wall portion 211 along its thickness direction. The connector 2311 can extend out of the outer casing 21 from the first lead-out hole 2111 to facilitate electrical connection with external components. The position of the connector 2311 extending out can be used to determine which wall portion of the outer casing 21 is the first wall portion 211.

[0141] The main body of the circuit board 23 is disposed between the first wall portion 211 and the electrode assembly 22. The connector 2311 extends out of the housing 21 from the first lead-out hole 2111. A sealed connection is formed between the connector 2311 and the first wall portion 211 to prevent harmful gases inside the housing 21 from leaking out.

[0142] Connector 2311 extends from the housing 21 through the first lead-out hole 2111, thereby facilitating electrical connection between connector 2311 and external components to transmit information collected by the acquisition component 231 to the external components. By sealing connector 2311 with the first wall portion 211, the risk of harmful gas leakage is reduced, thus reducing the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack 20.

[0143] Referring to Figures 3, 4, 5 and 6, in some embodiments, the battery pack 20 includes a first seal 2312 disposed around a first outlet hole 2111, the first seal 2312 being used to seal the connector 2311 and the first wall portion 211.

[0144] The first seal 2312 has sealing properties and is used to seal the connector 2311 and the first wall portion 211.

[0145] "The first seal 2312 is arranged around the first outlet hole 2111" means that in the projection plane perpendicular to the thickness direction of the first wall portion 211, the projection of the first seal 2312 is arranged around the outside of the projection of the hole wall surface of the first outlet hole 2111.

[0146] Since the connector 2311 extends out of the housing 21 from the first outlet hole 2111, the first seal 2312 is also arranged around the connector 2311. The first seal 2312 can abut between the circuit board 23 and the first wall portion 211. In this way, the first seal 2312 can prevent harmful gases from entering the first outlet hole 2111, so as to achieve a seal between the connector 2311 and the first wall portion 211.

[0147] The first sealing element 2312 can be a sealant, a gasket, a sealing ring, etc.

[0148] To facilitate the positioning of the first seal 2312, a first receiving groove can be provided on the circuit board 23 to accommodate the first seal 2312.

[0149] The first seal 2312 is arranged around the first lead hole 2111. Since the connector 2311 extends out of the housing 21 from the first lead hole 2111, the first seal 2312 is also arranged around the connector 2311. The first seal 2312 can abut against the circuit board 23 and the first wall portion 211, thereby sealing the connector 2311 and the first wall portion 211, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0150] Referring to Figures 3, 4, 5, and 6, in some embodiments, the circuit board 23 includes a bus assembly 232, which is electrically connected to a plurality of electrode assemblies 22. The bus assembly 232 includes a first lead-out portion 2321 and a second lead-out portion 2322, the polarities of which are opposite. The housing 21 includes a first wall portion 211, a portion of the circuit board 23 being disposed between the first wall portion 211 and the electrode assemblies 22. The first wall portion 211 has a second lead-out hole 2112 and a third lead-out hole 2113. The first lead-out portion 2321 extends out of the housing 21 from the second lead-out hole 2112 and is sealed to the first wall portion 211. The second lead-out portion 2322 extends out of the housing 21 from the third lead-out hole 2113 and is sealed to the first wall portion 211.

[0151] The busbar assembly 232 is electrically connected to multiple electrode assemblies 22, and is used to combine the current of the multiple electrode assemblies 22. The busbar assembly 232 may include a first lead-out portion 2321, a second lead-out portion 2322, a first busbar 2323, and a second busbar 2324. The first busbar 2323 is electrically connected to the first lead-out portion 2321 and the first tabs of the multiple electrode assemblies 22, and the second busbar 2324 is electrically connected to the second lead-out portion 2322 and the second tabs of the multiple electrode assemblies 22. One of the first tabs and the second tab is a positive tab, and the other of the first tabs and the second tab is a negative tab. When the first tab is a positive tab and the second tab is a negative tab, the first lead-out portion 2321 serves as the positive output terminal of the battery pack 20, and the second lead-out portion 2322 serves as the negative output terminal of the battery pack 20. When the first tab is the negative tab and the second tab is the positive tab, the first lead 2321 serves as the negative output terminal of the battery pack 20, and the second lead 2322 serves as the positive output terminal of the battery pack 20.

[0152] The acquisition component 231 can be electrically connected to the first busbar 2323 and the second busbar 2324 to acquire information from multiple electrode components 22.

[0153] The first wall portion 211 is provided with a second outlet hole 2112 and a third outlet hole 2113, both of which are through holes penetrating the first wall portion 211 along its thickness direction. The first outlet portion 2321 extends out of the outer casing 21 through the second outlet hole 2112 for connection to an external electrical connection component. The second outlet portion 2322 extends out of the outer casing 21 through the third outlet hole 2113 for connection to an external electrical connection component. Here, the external electrical connection component can be the aforementioned busbar component, or it can be an electrical device.

[0154] The main body of the circuit board 23 is disposed between the first wall portion 211 and the electrode assembly 22. The first lead-out portion 2321 and the second lead-out portion 2322 extend out of the outer casing 21 from the second lead-out hole 2112 and the third lead-out hole 2113, respectively. The second lead-out portion 2322 forms a sealed connection with the first wall portion 211 to prevent harmful gases inside the outer casing 21 from leaking out.

[0155] In the above embodiments, connector 2311, first lead-out portion 2321, and second lead-out portion 2322 are all disposed on the first wall portion 211, that is, connector 2311, first lead-out portion 2321, and second lead-out portion 2322 are all disposed on the same wall portion of housing 21. In other embodiments, connector 2311, first lead-out portion 2321, and second lead-out portion 2322 may also be disposed on different walls portions of housing 21.

[0156] Multiple electrode assemblies 22 are electrically connected by a busbar assembly 232, thereby achieving the convergence of current to the multiple electrode assemblies 22. One of the first lead-out portion 2321 and the second lead-out portion 2322 serves as the positive output terminal of the battery pack 20, and the other of the first lead-out portion 2321 and the second lead-out portion 2322 serves as the negative output terminal of the battery pack 20. The first lead-out portion 2321 extends out of the outer casing 21 from the second lead-out hole 2112, and the second lead-out portion 2322 extends out of the outer casing 21 from the third lead-out hole 2113, thereby facilitating connection with external electrical connection components and facilitating the output or input of electrical energy to the battery pack 20. The first lead-out portion 2321 is sealed to the first wall portion 211, thereby sealing the first lead-out portion 2321 and the first wall portion 211. The second lead-out portion 2322 is sealed to the first wall portion 211, thereby sealing the second lead-out portion 2322 and the first wall portion 211. This helps to reduce the risk of harmful gas leakage and improve the reliability of the battery pack 20.

[0157] Referring to Figures 3, 4, 5, and 6, in some embodiments, the battery pack 20 includes a second seal 2325, which surrounds the second lead-out hole 2112 and seals the first lead-out portion 2321 and the first wall portion 211. And / or the battery pack 20 includes a third seal 2326, which surrounds the third lead-out hole 2113 and seals the second lead-out portion 2322 and the first wall portion 211.

[0158] The second seal 2325 has sealing properties and is used to seal the first lead-out portion 2321 and the first wall portion 211. "The second seal 2325 is arranged around the second lead-out hole 2112" means that in a projection plane perpendicular to the thickness direction of the first wall portion 211, the projection of the second seal 2325 surrounds the outer side of the projection of the hole wall surface of the second lead-out hole 2112. Since the connector 2311 extends from the housing 21 through the second lead-out hole 2112, the second seal 2325 is also arranged around the connector 2311. The second seal 2325 can abut between the circuit board 23 and the first wall portion 211, thus preventing harmful gases from entering the second lead-out hole 2112, thereby achieving a seal for the first lead-out portion 2321 and the first wall portion 211. The second seal 2325 can be a sealant, gasket, sealing ring, etc. To facilitate the positioning of the second seal 2325, a second receiving groove can be provided on the circuit board 23 to accommodate the second seal 2325.

[0159] The third seal 2326 has sealing properties and is used to seal the second lead-out portion 2322 and the first wall portion 211. "The third seal 2326 is arranged around the third lead-out hole 2113" means that in a projection plane perpendicular to the thickness direction of the first wall portion 211, the projection of the third seal 2326 surrounds the outer side of the projection of the hole wall surface of the third lead-out hole 2113. Since the connector 2311 extends from the housing 21 through the third lead-out hole 2113, the third seal 2326 is also arranged around the connector 2311. The third seal 2326 can abut between the circuit board 23 and the first wall portion 211, thus preventing harmful gases from entering the third lead-out hole 2113, thereby achieving a seal for the second lead-out portion 2322 and the first wall portion 211. The third seal 2326 can be a sealant, gasket, sealing ring, etc. To facilitate the positioning of the third seal 2326, a third receiving groove can be provided on the circuit board 23 to accommodate the third seal 2326.

[0160] The second seal 2325 is disposed around the second lead-out hole 2112. Since the first lead-out portion 2321 extends out of the outer casing 21 from the second lead-out hole 2112, the second seal 2325 is also disposed around the first lead-out portion 2321. The second seal 2325 can abut against the circuit board 23 and the first wall portion 211, thereby sealing the first lead-out portion 2321 and the first wall portion 211, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20. The third seal 2326 is disposed around the third lead-out hole 2113. Since the second lead-out portion 2322 extends out of the outer casing 21 from the third lead-out hole 2113, the third seal 2326 is also disposed around the second lead-out portion 2322. The third seal 2326 can abut against the circuit board 23 and the first wall portion 211, thereby sealing the second lead-out portion 2322 and the first wall portion 211, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0161] Referring to Figures 3, 4, 5, and 6, in some embodiments, the battery pack 20 includes a first insulating member 2327 disposed between the wall surfaces of the first lead-out portion 2321 and the second lead-out hole 2112. And / or the battery pack 20 includes a second insulating member 2328 disposed between the wall surfaces of the second lead-out portion 2322 and the third lead-out hole 2113.

[0162] The first insulating element 2327 has insulating properties and is disposed between the wall surfaces of the first lead-out portion 2321 and the second lead-out hole 2112 to insulate and isolate the first lead-out portion 2321 and the first wall portion 211, thereby reducing the risk of short circuit due to contact between the first lead-out portion 2321 and the first wall portion 211. The material of the first insulating element 2327 can be plastic, rubber, etc.

[0163] Optionally, the first insulating element 2327 and the first lead-out portion 2321 are integrally injection molded.

[0164] The second insulating member 2328 has insulating properties and is disposed between the second lead-out portion 2322 and the hole wall surface of the third lead-out hole 2113 to insulate and isolate the second lead-out portion 2322 from the first wall portion 211, thereby reducing the risk of short circuit due to contact between the second lead-out portion 2322 and the first wall portion 211. The material of the second insulating member 2328 can be plastic, rubber, etc.

[0165] Optionally, the second insulating element 2328 and the second lead-out portion 2322 are integrally injection molded.

[0166] By providing the first insulating member 2327, the risk of short circuit due to contact between the wall surfaces of the first lead-out portion 2321 and the second lead-out hole 2112 is reduced, which helps improve the reliability of the battery pack 20. By providing the second insulating member 2328, the risk of short circuit due to contact between the wall surfaces of the second lead-out portion 2322 and the third lead-out hole 2113 is reduced, which helps improve the reliability of the battery pack 20.

[0167] Referring to Figures 3, 4, 5 and 6, in some embodiments, the battery pack 20 includes a locking attachment 25 configured to lock the circuit board 23 and the first wall portion 211.

[0168] The lock accessory 25 includes a first lock accessory 251, a second lock accessory 252, and a third lock accessory 253. The first wall portion 211 is provided with a first mounting hole 2114, a second mounting hole 2115, and a third mounting hole 2116. The first lock accessory 251 passes through the first mounting hole 2114 and locks the circuit board 23 and the first wall portion 211. The second lock accessory 252 passes through the second mounting hole 2115 and locks the circuit board 23 and the first wall portion 211. The third lock accessory 253 passes through the third mounting hole 2116 and locks the circuit board 23 and the first wall portion 211.

[0169] Optionally, the first lock accessory 251, the second lock accessory 252, and the third lock accessory 253 are all screws, and the first lock accessory 251, the second lock accessory 252, and the third lock accessory 253 are all threaded to the circuit board 23 to lock the circuit board 23 and the first wall portion 211.

[0170] In some embodiments, a first seal 2312 is disposed around a first mounting hole 2114 to seal a first lock attachment 251 and a first wall portion 211. A second seal 2325 is disposed around a second mounting hole 2115 to seal a second lock attachment 252 and a first wall portion 211. A third seal 2326 is disposed around a third mounting hole 2116 to seal a third lock attachment 253 and a first wall portion 211.

[0171] By setting the locking attachment 25, the circuit board 23 is locked to the first wall portion 211, thereby positioning the circuit board 23, reducing the risk of the circuit board 23 shaking during the use of the battery pack 20, and helping to maintain a stable connection between the circuit board 23 and the electrode assembly 22 or other electrical connection components.

[0172] Please refer to Figures 3, 4, 5, 6, and 7. Figure 7 is an exploded view of the second wall portion 212 and the housing 213 provided in some embodiments of this application. In some embodiments, the electrode assembly 22 includes a solid electrolyte layer 222 and a plurality of electrode plates 221. Along a first direction, the solid electrolyte layer 222 is disposed between two adjacent electrode plates 221. The electrode plates 221 include an active material layer. In the two adjacent electrode plates 221, the active material layers facing the solid electrolyte layer 222 located between the two adjacent electrode plates 221 have opposite polarities. The housing 21 includes a second wall portion 212 and a third wall portion 2131, which are disposed opposite to each other along the first direction. The second wall portion 212 and the third wall portion 2131 cooperate to compress the plurality of electrode assemblies 22.

[0173] "In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite." That is, in two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is opposite to that of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221. In other words, in two adjacent electrodes 221, the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is the positive electrode active material layer, and the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of the other electrode 221 is the negative electrode active material layer.

[0174] In some embodiments, multiple electrode sheets 221 include positive electrode sheets and negative electrode sheets. The positive electrode sheets, solid electrolyte layer 222, and negative electrode sheets are stacked along a second direction to form an electrode assembly 22. The portions of the positive and negative electrode sheets with active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active material each constitute an electrode tab. The positive and negative electrode tabs may be located together at one end of the main body or at both ends of the main body. In other embodiments, the electrode sheet 221 includes a current collector 2213, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector 2213. The solid electrolyte layer 222 and multiple electrode sheets 221 are stacked to form the electrode assembly 22. The multiple electrode sheets 221 and the solid electrolyte layer 222 are arranged along a second direction, with a solid electrolyte layer 222 disposed between adjacent electrode sheets 221.

[0175] The second wall portion 212 and the third wall portion 2131 are two wall portions of the outer casing 21 that are disposed opposite each other along the first direction. Along the first direction, a plurality of electrode assemblies 22 are disposed between the second wall portion 212 and the third wall portion 2131. The second wall portion 212 and the third wall portion 2131 cooperate to press the plurality of electrode assemblies 22 to compress the solid electrolyte layer 222 and the plurality of electrode sheets 221.

[0176] The second wall portion 212 and the third wall portion 2131 cooperate to compress the electrode assembly 22 along the first direction, thereby pressing the solid electrolyte layer 222 and the multiple electrode sheets 221 together, so that the electrode sheets 221 and the solid electrolyte layer 222 can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack 20.

[0177] Please refer to Figures 3, 4, 5, 6 and 7. In some embodiments, multiple electrode assemblies 22 are arranged along a first direction.

[0178] Multiple electrode components 22 are arranged along a first direction, that is, the arrangement direction of the multiple electrode components 22 is the same as the arrangement direction of the multiple electrode sheets 221 and the solid electrolyte layer 222.

[0179] By arranging multiple electrode components 22 along a first direction, the second wall portion 212 and the third wall portion 2131 can cooperate to compress the multiple electrode components 22 along the first direction, thereby pressing the electrode plates 221 and the solid electrolyte layer 222 of the multiple electrode components 22 together, which facilitates ion transport and reduces the internal resistance of the battery pack 20.

[0180] Referring to Figures 3, 4, 5, 6, and 7, in some embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite each other along a second direction. A third wall portion 2131 connects the fourth wall portion 2132 and the fifth wall portion 2133. The third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 are integrally formed to form a casing 213 having a first opening 2134 in a first direction. A second wall portion 212 closes the first opening 2134. The second direction is perpendicular to the first direction.

[0181] The fourth wall portion 2132 and the fifth wall portion 2133 are two wall portions of the outer casing 21 that are disposed opposite each other along a second direction. The second direction is perpendicular to the first direction. Please refer to Figure 7. The second direction can be the Y direction shown in the figure.

[0182] The third wall portion 2131 connects to the fourth wall portion 2132 and the fifth wall portion 2133, and the third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 are integrally formed. The third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 together form a shell 213, and the shell 213 has a first opening 2134 at one end along the first direction. The shell 213 has a U-shaped structure, and the opening end of the U-shaped structure is located in the first direction.

[0183] The second wall portion 212 is connected to the end of the housing 213 that forms the first opening 2134 and seals the first opening 2134. In other words, the second wall portion 212 is separately disposed from the housing 213 and connected thereto. For example, the second wall portion 212 may be welded to the housing 213.

[0184] The housing 213 is formed by integrally molding the third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133. The second wall portion 212 is separately disposed from and connected to the housing 213. During assembly, multiple electrode assemblies 22 can be first housed within the housing 213, and then the second wall portion 212 is used to press the multiple electrode assemblies 22 against the third wall portion 2131 along a first direction. After that, the second wall portion 212 is connected to the housing 213. In this way, the second wall portion 212 and the third wall portion 2131 can be easily used to press the multiple electrode assemblies 22 together during assembly.

[0185] Referring to Figures 3, 4, 5, 6, and 7, in some embodiments, along a third direction, the housing 213 has a second opening 2135 and a third opening 2136 disposed opposite to each other. The housing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The dimensions of the housing 21 along the first direction and the second direction are both smaller than the dimensions of the housing 21 along the third direction, and the first, second, and third directions are perpendicular to each other.

[0186] The housing 213 has a second opening 2135 and a third opening 2136 formed at both ends along a third direction, as shown in Figure 7. The third direction can be the Z direction shown in the figure.

[0187] The outer casing 21 includes a first wall portion 211 and a sixth wall portion 214. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the second wall portion 212, the casing 213, and the sixth wall portion 214 together define a sealed space.

[0188] "The dimensions of the outer shell 21 along the first direction and the dimensions of the outer shell 21 along the second direction are both smaller than the dimensions of the outer shell 21 along the third direction." That is, the dimensions of the outer shell 21 along the first direction are smaller than the dimensions of the outer shell 21 along the third direction, and the dimensions of the outer shell 21 along the second direction are smaller than the dimensions of the outer shell 21 along the third direction.

[0189] During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the first opening 2134. Since the dimensions of the housing 21 along the first direction and the second direction are both smaller than the dimensions of the housing 21 along the third direction, the distance that the multiple electrode assemblies 22 need to move to be inserted into the housing 213 through the first opening 2134 is relatively short, making assembly simpler and more convenient.

[0190] Please refer to Figures 8 and 9. Figure 8 is an exploded view of a battery pack 20 provided in some embodiments of this application. Figure 9 is an exploded view of a fifth wall portion 2133 and a housing 213 provided in some embodiments of this application. In some embodiments, the housing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite to each other along a second direction. The fourth wall portion 2132 connects the second wall portion 212 and the third wall portion 2131. The second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 are integrally formed to form a housing 213 having a fourth opening 2137 in the second direction. The fifth wall portion 2133 closes the fourth opening 2137. The dimension of the housing 21 along the second direction is smaller than the dimension of the housing 21 along the first direction. The second direction is perpendicular to the first direction.

[0191] The fourth wall portion 2132 connects the second wall portion 212 and the third wall portion 2131, and the second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 are integrally formed. The second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 together form a shell 213, and the shell 213 has a fourth opening 2137 at one end along the second direction. The shell 213 has a U-shaped structure, and the opening end of the U-shaped structure is located in the second direction.

[0192] The fifth wall portion 2133 is connected to the end of the housing 213 that forms the fourth opening 2137, and seals the fourth opening 2137. In other words, the fifth wall portion 2133 is separately disposed from and connected to the housing 213. For example, the fifth wall portion 2133 may be welded to the housing 213.

[0193] By integrally molding the second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 to form a housing, and separately setting and connecting the fifth wall portion 2133 to the housing 213, during assembly, multiple electrode assemblies 22 can be first inserted into the housing 213 through the fourth opening 2137, and then the fifth wall portion 2133 can be connected to the housing 213. Since the size of the outer shell 21 along the second direction is smaller than the size of the outer shell 21 along the first direction, the distance that multiple electrode assemblies 22 need to move to be inserted into the housing 213 through the fourth opening 2137 is relatively short, making assembly simpler and more convenient.

[0194] Referring to Figures 8 and 9, in some embodiments, along a third direction, the housing 213 has a second opening 2135 and a third opening 2136 disposed opposite to each other. The housing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The dimension of the housing 21 along the first direction is smaller than the dimension of the housing 21 along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0195] The outer casing 21 includes a first wall portion 211 and a sixth wall portion 214. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the casing 213, the fifth wall portion 2133, and the sixth wall portion 214 together define a sealed space.

[0196] If the dimension of the outer shell 21 along the second direction is smaller than the dimension of the outer shell 21 along the first direction, and the dimension of the outer shell 21 along the first direction is smaller than the dimension of the outer shell 21 along the third direction, then the dimension of the outer shell 21 along the second direction is the smallest.

[0197] During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the fourth opening 2137. Since the outer shell 21 has the smallest size along the second direction, the distance that multiple electrode assemblies 22 need to move to be inserted into the housing 213 through the fourth opening 2137 is the shortest, making assembly simpler and more convenient.

[0198] Please refer to Figure 10, which is an exploded view of a battery pack 20 provided in some embodiments of this application. In some embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite to each other along a second direction. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are connected end to end, and are integrally formed to form a casing 213 having a second opening 2135 and a third opening 2136 in a third direction. The outer casing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The first direction, the second direction, and the third direction are perpendicular to each other.

[0199] The second wall portion 212 and the third wall portion 2131 are arranged opposite each other along a first direction, the fourth wall portion 2132 and the fifth wall portion 2133 are arranged opposite each other along a second direction, and the first wall portion 211 and the sixth wall portion 214 are arranged opposite each other along a third direction. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131 and the fifth wall portion 2133 are connected end to end to form a cylindrical structure. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131 and the fifth wall portion 2133 are integrally formed to form a shell 213. The shell 213 has a second opening 2135 and a third opening 2136 at its two ends along a third direction, respectively. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the shell 213 and the sixth wall portion 214 together define a sealed space.

[0200] The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are integrally formed to form the housing 213. During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the second opening 2135 or the third opening 2136. Then, the second opening 2135 is closed by the first wall portion 211, and the third opening 2136 is closed by the sixth wall portion 214. The assembly steps are fewer and the assembly efficiency is higher.

[0201] Please refer to Figure 11, which is a cross-sectional view of a battery pack 20 provided in some embodiments of this application. In some embodiments, the electrode assembly 22 is not encapsulated and is directly housed within the housing 21.

[0202] "Electrode assembly 22 is not encapsulated and is directly housed within the housing 21" means that the outer side of electrode assembly 22 does not need to be encapsulated by the encapsulation bag 28, and multiple electrode assemblies 22 can be directly housed within the housing 21. In other words, the battery pack 20 can omit the encapsulation bag 28 for encapsulating the electrode assembly 22, thereby enabling the battery pack 20 to have a higher energy density.

[0203] Since the outer casing 21 has a sealed space that protects the electrode assembly 22, the electrode assembly 22 can be directly housed within the outer casing 21 without the need for encapsulation. This eliminates the need for the encapsulation bag 28 for the electrode assembly 22, reducing the space occupied within the outer casing 21 and thus improving the energy density of the battery pack 20.

[0204] Referring to Figure 11, in some embodiments, a third insulating member 26 is provided between the electrode assembly 22 and the housing 21. The third insulating member 26 is used to insulate and isolate the electrode assembly 22 and the housing 21.

[0205] The third insulating element 26 has insulating properties and is disposed between the electrode assembly 22 and the housing 21 to insulate and isolate the electrode assembly 22 and the housing 21, thereby reducing the risk of short circuit due to contact between the electrode assembly 22 and the housing 21. The material of the third insulating element 26 can be plastic, rubber, resin, etc.

[0206] Optionally, the third insulating element 26 is an insulating adhesive disposed between the electrode assembly 22 and the housing 21.

[0207] By providing a third insulating element 26 between the electrode assembly 22 and the housing 21, the third insulating element 26 can insulate and isolate the electrode assembly 22 and the housing 21, reducing the risk of short circuit due to contact between the electrode assembly 22 and the housing 21, which is beneficial to improving the reliability of the battery pack 20.

[0208] Referring to Figure 11, in some embodiments, a plurality of electrode assemblies 22 are arranged along a first direction, and a separator 27 is provided between two adjacent electrode assemblies 22 along the first direction.

[0209] Along the first direction, a separator 27 is disposed between two adjacent electrode assemblies 22, the separator 27 serving to separate the two adjacent electrode assemblies 22. The separator 27 includes an insulating material to insulate and isolate the two electrode assemblies 22.

[0210] By separating two adjacent electrode assemblies 22 with separator 27, when one electrode assembly 22 is damaged, it is less likely to affect the use of other electrode assemblies 22, which helps to improve the reliability of the battery pack 20.

[0211] Please refer to Figure 12, which is a cross-sectional view of a battery pack 20 provided in some other embodiments of this application. In some other embodiments, the battery pack 20 includes a plurality of encapsulation bags 28, each encapsulating at least one electrode assembly 22, and the encapsulation bags 28 are housed within a housing 21.

[0212] The battery pack 20 may include several or dozens of encapsulation bags 28, and may also include more encapsulation bags 28. Each encapsulation bag 28 can encapsulate one, two, three, four, or more electrode components 22. The encapsulation bag 28 containing at least one electrode component 22 is housed within a sealed space, that is, the outer casing 21 seals multiple encapsulation bags 28. In other words, the encapsulation bag 28 encapsulates at least one electrode component 22 to form a battery cell, and the battery cell is housed within the outer casing 21.

[0213] The packaging bag 28 can be a soft outer shell, such as aluminum-plastic film, heat shrink film, etc.

[0214] After the electrode assembly 22 is encapsulated in the encapsulation bag 28, multiple encapsulation bags 28 are then housed within the outer casing 21. On one hand, the encapsulation bags 28 serve as insulation, reducing the risk of short circuits caused by contact between the electrode assembly 22 and the outer casing 21. On the other hand, any harmful gases produced can be sealed within the encapsulation bags 28, further reducing the risk of leakage and harm to human health, thus improving the reliability of the battery pack 20.

[0215] Referring to Figure 12, in some embodiments, a plurality of packaging bags 28 are arranged along a first direction, and a separator 27 is provided between two adjacent packaging bags 28 along the first direction.

[0216] Along the first direction, a separator 27 is disposed between two adjacent packaging bags 28, the separator 27 serving to separate the two adjacent packaging bags 28. The separator 27 includes an insulating material to insulate the two packaging bags 28.

[0217] By separating two adjacent packaging bags 28 with separator 27, when the electrode assembly 22 in one packaging bag 28 is damaged, it is less likely to affect the use of the electrode assembly 22 in other packaging bags 28, which helps to improve the reliability of the battery pack 20.

[0218] In some embodiments, the separator 27 is made of heat-insulating material.

[0219] Thermal insulation materials have poor heat conductivity, meaning they have a low thermal conductivity coefficient. Insulation materials can include fiberglass, asbestos, rock wool, silicates, etc.

[0220] The separator 27 is a heat insulation material. When the heat of one electrode assembly 22 exceeds the threshold, the separator 27 can play a heat insulation role, preventing heat from being conducted to other electrode assemblies 22, which helps to reduce the risk of damage to other electrode assemblies 22.

[0221] Referring to Figure 5, in some embodiments, the electrode assembly 22 includes a solid electrolyte layer 222 and a plurality of electrodes 221, wherein the solid electrolyte layer 222 is disposed between two adjacent electrodes 221. Each electrode 221 includes an active material layer, and in two adjacent electrodes 221, the active material layers facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 have opposite polarities.

[0222] If the electrode assembly 22 includes a solid electrolyte layer 222, then the electrode assembly 22 is a solid electrode assembly. The solid electrolyte layer 222 is disposed between two adjacent electrodes 221, and serves to both transport ions and isolate the positive and negative electrodes.

[0223] Solid electrolyte layer 222 includes a polymer solid electrolyte layer, an inorganic solid electrolyte layer, and a composite solid electrolyte layer. As an example, the polymer solid electrolyte layer can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid-lithium salt, cellulose, etc. As an example, the inorganic solid electrolyte layer can include oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes. As an example, the composite solid electrolyte layer is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0224] "In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite." That is, in two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is opposite to that of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221. In other words, in two adjacent electrodes 221, the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is the positive electrode active material layer, and the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of the other electrode 221 is the negative electrode active material layer.

[0225] In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite. The polarity of the two active material layers adjacent to the solid electrolyte layer 222 and located on both sides of the solid electrolyte layer 222 is opposite. The solid electrolyte layer 222 simultaneously plays the role of transporting ions and isolating the positive electrode active material layer and the negative electrode active material layer.

[0226] Referring to Figure 5, in some embodiments, the plurality of electrodes 221 include a first electrode 2211 and a second electrode 2212, the first electrode 2211 and the second electrode 2212 having opposite polarities. The first electrode 2211, the solid electrolyte layer 222 and the second electrode 2212 are stacked, with the solid electrolyte layer 222 disposed between the first electrode 2211 and the second electrode 2212.

[0227] One of the first electrode 2211 and the second electrode 2212 is the positive electrode, and the other is the negative electrode. For example, when the first electrode 2211 is the positive electrode, the second electrode 2212 is the negative electrode. Or, for instance, when the first electrode 2211 is the positive electrode, the second electrode 2212 is the negative electrode.

[0228] The electrode assembly 22 includes a first electrode 2211, a solid electrolyte layer 222, and a second electrode 2212 stacked together. Thus, the electrode assembly 22 is simple and convenient to manufacture and has a low cost.

[0229] Please refer to Figure 13, which is a cross-sectional view of the electrode assembly 22 provided in some embodiments of this application. In some embodiments, the electrode 221 includes a current collector 2213, a first active material layer 2214, and a second active material layer 2215, wherein the polarities of the first active material layer 2214 and the second active material layer 2215 are opposite. The first active material layer 2214 and the second active material layer 2215 are respectively disposed on both sides of the current collector 2213.

[0230] The electrode 221 is a bipolar electrode. A first active material layer 2214 and a second active material layer 2215 are respectively disposed on both sides of the current collector 2213. One of the first active material layer 2214 and the second active material layer 2215 is a positive active material layer, and the other of the first active material layer 2214 and the second active material layer 2215 is a negative active material layer.

[0231] By making the electrode 221 include a current collector 2213, a first active material layer 2214 and a second active material layer 2215, with the first active material layer 2214 and the second active material layer 2215 having opposite polarities, it is beneficial to make the battery pack 20 have a higher energy density.

[0232] In some embodiments, the electrode assembly includes a solid electrolyte layer 222, which includes a sulfide.

[0233] When the solid electrolyte layer 222 includes sulfides, the electrode assembly 22 will generate hydrogen sulfide during use. Hydrogen sulfide is very harmful to human health, so it is even more necessary to seal it through the outer shell 21.

[0234] In some embodiments, a mounting structure 24 is provided on the outer side of the housing 21. The mounting structure 24 is used to connect the housing 21 to other components to fix the housing 21. For example, the mounting structure 24 is provided with a threaded hole, which allows the housing 21 to be threadedly connected to other components via a threaded connector.

[0235] This application embodiment also provides a battery device 100, which includes a housing 10 and a plurality of the above-described battery packs 20, with the plurality of battery packs 20 housed within the housing 10.

[0236] In some embodiments, the outer casing 21 is connected to the housing 10.

[0237] In some embodiments, a mounting structure 24 is provided on the outer side of the housing 21. The mounting structure 24 is used to connect the housing 21 to the housing 10 to fix the housing 21 inside the housing 10. For example, the mounting structure 24 is provided with a threaded hole, which allows the housing 21 to be threadedly connected to the housing 10 by a threaded connector.

[0238] In other embodiments, the outer shell 21 is bonded to the housing 10.

[0239] By connecting the outer casing 21 to the housing 10 and limiting the outer casing 21, it is beneficial to reduce the risk of the battery pack 20 shaking during the use of the battery device 100, to maintain a stable connection between the battery pack 20 and other electrical connection components, and to improve the reliability of the battery device 100.

[0240] This application embodiment also provides an electrical device, which includes the battery pack 20 described above.

[0241] Please refer to Figures 3 to 12 for some embodiments of this application.

[0242] This application provides a battery pack 20, which includes a casing 21 and multiple electrode assemblies 22. Each electrode assembly 22 includes a first electrode 2211, a solid electrolyte layer 222, and a second electrode 2212. The first and second electrodes 2211 have opposite polarities, and the solid electrolyte layer 222 is disposed between the first and second electrodes 2211 and 2212. The casing 21 has a sealed space within which the multiple electrode assemblies 22 are housed. Since the electrode assemblies 22 of this battery pack 20 include a solid electrolyte layer 222, harmful gases are generated during use. By providing a sealed space within the casing 21, the multiple electrode assemblies 22 are effectively sealed, thus preventing the harmful gases from leaking out and reducing the risk of them harming human health. This improves the reliability of the battery pack 20.

[0243] The battery pack 20 includes a circuit board 23, which is at least partially housed within the housing 21. The circuit board 23 includes a data acquisition component 231, which is electrically connected to multiple electrode components 22. The data acquisition component 231 is used to acquire information from the electrode components 22. By using the data acquisition component 231 to acquire information from the electrode components 22, it is easier to assess the state of the electrode components 22 based on the acquired information, enabling intelligent management and optimized control of the electrode components 22, which helps improve the efficiency, reliability, and lifespan of the battery pack 20.

[0244] The data acquisition component 231 includes a connector 2311 for electrical connection with an external component. The housing 21 includes a first wall 211, a portion of the circuit board 23 is disposed between the first wall 211 and the electrode assembly 22, and the first wall 211 has a first lead-out hole 2111. The connector 2311 extends out of the housing 21 from the first lead-out hole 2111 and is sealed to the first wall 211. The connector 2311's extension from the first lead-out hole 2111 facilitates electrical connection with an external component, enabling the transmission of information acquired by the data acquisition component 231 to that component. By sealing the connector 2311 to the first wall 211, the risk of harmful gas leakage is reduced, thus mitigating the risk of harmful gases posing a health hazard and improving the reliability of the battery pack 20.

[0245] The circuit board 23 includes a bus assembly 232, which is electrically connected to a plurality of electrode assemblies 22. The bus assembly 232 includes a first lead-out portion 2321 and a second lead-out portion 2322, the polarities of which are opposite. The housing 21 includes a first wall portion 211, a portion of the circuit board 23 being disposed between the first wall portion 211 and the electrode assemblies 22. The first wall portion 211 has a second lead-out hole 2112 and a third lead-out hole 2113. The first lead-out portion 2321 extends out of the housing 21 from the second lead-out hole 2112 and is sealed to the first wall portion 211. The second lead-out portion 2322 extends out of the housing 21 from the third lead-out hole 2113 and is sealed to the first wall portion 211. Multiple electrode assemblies 22 are electrically connected by a busbar assembly 232, thereby achieving the convergence of current to the multiple electrode assemblies 22. One of the first lead-out portion 2321 and the second lead-out portion 2322 serves as the positive output terminal of the battery pack 20, and the other of the first lead-out portion 2321 and the second lead-out portion 2322 serves as the negative output terminal of the battery pack 20. The first lead-out portion 2321 extends out of the outer casing 21 from the second lead-out hole 2112, and the second lead-out portion 2322 extends out of the outer casing 21 from the third lead-out hole 2113, thereby facilitating connection with external electrical connection components and facilitating the output or input of electrical energy to the battery pack 20. The first lead-out portion 2321 is sealed to the first wall portion 211, thereby sealing the first lead-out portion 2321 and the first wall portion 211. The second lead-out portion 2322 is sealed to the first wall portion 211, thereby sealing the second lead-out portion 2322 and the first wall portion 211. This helps to reduce the risk of harmful gas leakage and improve the reliability of the battery pack 20.

[0246] The first electrode 2211, the solid electrolyte layer 222, and the second electrode 2212 are stacked along a first direction. The outer casing 21 includes a second wall portion 212 and a third wall portion 2131, which are arranged opposite to each other along the first direction. The second wall portion 212 and the third wall portion 2131 cooperate to compress multiple electrode assemblies 22. The second wall portion 212 and the third wall portion 2131 cooperate to compress the electrode assemblies 22 along the first direction, thereby pressing the first electrode 2211, the solid electrolyte layer 222, and the second electrode 2212 together, so that the first electrode 2211 and the solid electrolyte layer 222, and the second electrode 2212 and the solid electrolyte layer 222, can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack 20.

[0247] In some embodiments, the housing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite to each other along a second direction. A third wall portion 2131 connects the fourth wall portion 2132 and the fifth wall portion 2133. The third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 are integrally formed to form a housing 213 having a first opening 2134 in a first direction. A second wall portion 212 closes the first opening 2134. The second direction is perpendicular to the first direction. By integrally forming the housing 213 with the third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133, and separately disposed from and connected to the housing 213, during assembly, multiple electrode assemblies 22 can be first accommodated in the housing 213, and then the multiple electrode assemblies 22 can be pressed against the third wall portion 2131 along the first direction by the second wall portion 212, and then the second wall portion 212 can be connected to the housing 213. In this way, during assembly, the second wall portion 212 and the third wall portion 2131 can be easily fitted together to press multiple electrode assemblies 22.

[0248] In other embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite each other along a second direction. The fourth wall portion 2132 connects the second wall portion 212 and the third wall portion 2131. The second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 are integrally formed to form a casing 213 having a fourth opening 2137 in the second direction, and the fifth wall portion 2133 closes the fourth opening 2137. The dimension of the outer casing 21 along the second direction is smaller than the dimension of the outer casing 21 along the first direction. The second direction is perpendicular to the first direction. The outer casing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The dimension of the outer casing 21 along the first direction is smaller than the dimension of the outer casing 21 along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The housing is formed by integrally molding the second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132, while the fifth wall portion 2133 is separately disposed and connected to the housing 213. During assembly, multiple electrode assemblies 22 can be first inserted into the housing 213 through the fourth opening 2137, and then the fifth wall portion 2133 can be connected to the housing 213. The dimension of the housing 21 along the second direction is smaller than the dimension of the housing 21 along the first direction, and the dimension of the housing 21 along the first direction is smaller than the dimension of the housing 21 along the third direction, thus the dimension of the housing 21 along the second direction is the smallest. During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the fourth opening 2137. Since the dimension of the housing 21 along the second direction is the smallest, the distance that multiple electrode assemblies 22 need to move to be inserted into the housing 213 through the fourth opening 2137 is the shortest, making assembly simpler and more convenient.

[0249] In some other embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite to each other along a second direction. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are connected end-to-end and are integrally formed to create a casing 213 having a second opening 2135 and a third opening 2136 in a third direction. The outer casing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The first direction, the second direction, and the third direction are perpendicular to each other. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are integrally formed to form the housing 213. During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the second opening 2135 or the third opening 2136. Then, the second opening 2135 is closed by the first wall portion 211, and the third opening 2136 is closed by the sixth wall portion 214. The assembly steps are fewer and the assembly efficiency is higher.

[0250] In some embodiments, the electrode assembly 22 is not encapsulated and is directly housed within the housing 21. Since the housing 21 has a sealed space that protects the electrode assembly 22, it is not necessary to encapsulate the electrode assembly 22; it can be directly housed within the housing 21. This eliminates the need for the encapsulation bag 28 for the electrode assembly 22, reducing the space occupied within the housing 21 and thus improving the energy density of the battery pack 20.

[0251] In other embodiments, the battery pack 20 includes a plurality of encapsulation bags 28, each encapsulating at least one electrode assembly 22, and the encapsulation bags 28 are housed within the housing 21. By encapsulating the electrode assembly 22 with the encapsulation bags 28 and then housing the plurality of encapsulation bags 28 within the housing 21, the encapsulation bags 28 can serve as insulation, reducing the risk of short circuits caused by contact between the electrode assembly 22 and the housing 21. Furthermore, any harmful gases generated can be sealed within the encapsulation bags 28, further reducing the risk of leakage and harm to human health, thus improving the reliability of the battery pack 20.

[0252] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. 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 pack, wherein, include: Multiple electrode assemblies are stacked and electrically connected, and each electrode assembly is a solid-state electrode assembly; The housing has a sealed space in which the plurality of electrode assemblies are housed.

2. The battery pack according to claim 1, wherein, The battery pack also includes a circuit board, which is at least partially housed within the housing. The circuit board includes a data acquisition component electrically connected to a plurality of the electrode components, and the data acquisition component is used to acquire information from the electrode components.

3. The battery pack according to claim 2, wherein, The acquisition component includes a connector for electrical connection with external components; The housing includes a first wall portion, a portion of the circuit board is disposed between the first wall portion and the electrode assembly, the first wall portion is provided with a first lead-out hole, the connector extends out of the housing from the first lead-out hole, and the connector is sealed to the first wall portion.

4. The battery pack according to claim 3, wherein, The battery pack includes a first seal surrounding the first outlet hole, the first seal being used to seal the connector and the first wall portion.

5. The battery pack according to claim 2, wherein, The circuit board includes a bus assembly, which is electrically connected to a plurality of electrode assemblies. The bus assembly includes a first lead and a second lead, the first lead and the second lead having opposite polarities. The housing includes a first wall portion, a portion of the circuit board is disposed between the first wall portion and the electrode assembly, the first wall portion is provided with a second lead-out hole and a third lead-out hole, the first lead-out portion extends out of the housing from the second lead-out hole and is sealed to the first wall portion, and the second lead-out portion extends out of the housing from the third lead-out hole and is sealed to the first wall portion.

6. The battery pack according to claim 5, wherein, The battery pack further includes a second seal, which is disposed around the second outlet hole and is used to seal the first outlet portion and the first wall portion; and / or The battery pack further includes a third seal, which is disposed around the third lead-out hole and is used to seal the second lead-out portion and the first wall portion.

7. The battery pack according to claim 5 or 6, wherein, The battery pack includes a first insulating member disposed between the first lead-out portion and the wall surface of the second lead-out hole; and / or The battery pack includes a second insulating member disposed between the second lead-out portion and the wall surface of the third lead-out hole.

8. The battery pack according to any one of claims 3-7, wherein, The battery pack includes a locking attachment configured to lock the circuit board and the first wall portion.

9. The battery pack according to any one of claims 1-8, wherein, The electrode assembly includes a solid electrolyte layer and a plurality of electrodes. Along a first direction, the solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layers facing the solid electrolyte layer located between the two adjacent electrodes have opposite polarities. The housing includes a second wall portion and a third wall portion, which are disposed opposite to each other along the first direction, and the second wall portion and the third wall portion cooperate to press together a plurality of electrode assemblies.

10. The battery pack according to claim 9, wherein, The plurality of electrode assemblies are arranged along the first direction.

11. The battery pack according to claim 9 or 10, wherein, The outer casing includes a fourth wall portion and a fifth wall portion, which are disposed opposite to each other along a second direction. A third wall portion connects the fourth wall portion and the fifth wall portion. The third wall portion, the fourth wall portion, and the fifth wall portion are integrally formed to form a casing having a first opening in the first direction. A second wall portion closes the first opening. The second direction is perpendicular to the first direction.

12. The battery pack according to claim 11, wherein, Along a third direction, the housing has a second opening and a third opening disposed opposite to each other, and the housing further includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; The dimensions of the outer shell along the first direction and the second direction are both smaller than the dimensions of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

13. The battery pack according to claim 9 or 10, wherein, The outer casing includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion being disposed opposite each other along a second direction, the fourth wall portion connecting the second wall portion and the third wall portion, the second wall portion, the third wall portion and the fourth wall portion being integrally formed to form a casing having a fourth opening in the second direction, and the fifth wall portion closing the fourth opening; The dimension of the outer casing along the second direction is smaller than the dimension of the outer casing along the first direction, and the second direction is perpendicular to the first direction.

14. The battery pack according to claim 13, wherein, Along a third direction, the housing has a second opening and a third opening disposed opposite to each other, and the housing further includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; The size of the outer shell along the first direction is smaller than the size of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

15. The battery pack according to claim 9 or 10, wherein, The outer shell includes a fourth wall portion and a fifth wall portion, which are disposed opposite to each other along a second direction. The second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are connected end to end in sequence. The second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are integrally formed to form a shell having a second opening and a third opening in a third direction. The outer casing also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening, and the first direction, the second direction and the third direction are perpendicular to each other.

16. The battery pack according to any one of claims 1-15, wherein, The electrode assembly is not encapsulated and is directly housed within the housing.

17. The battery pack according to claim 16, wherein, A third insulating element is provided between the electrode assembly and the housing, the third insulating element being used to insulate and isolate the electrode assembly and the housing.

18. The battery pack according to claim 16 or 17, wherein, The plurality of electrode assemblies are arranged along a first direction, and a separator is provided between two adjacent electrode assemblies along the first direction.

19. The battery pack according to any one of claims 1-15, wherein, The battery pack includes multiple encapsulation bags, each encapsulating at least one of the electrode components, and the encapsulation bags are housed within the housing.

20. The battery pack according to claim 19, wherein, The plurality of the packaging bags are arranged along a first direction, and a separator is provided between two adjacent packaging bags along the first direction.

21. The battery pack according to claim 18 or 20, wherein, The separator is made of heat-insulating material.

22. The battery pack according to any one of claims 1-21, wherein, The electrode assembly includes a solid electrolyte layer and a plurality of electrodes. The solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layers facing the solid electrolyte layer located between the two adjacent electrodes have opposite polarities.

23. The battery pack according to claim 22, wherein, The plurality of electrodes include a first electrode and a second electrode, the first electrode and the second electrode having opposite polarities, the first electrode, the solid electrolyte layer and the second electrode being stacked, and the solid electrolyte layer being disposed between the first electrode and the second electrode.

24. The battery pack according to claim 22, wherein, The electrode includes a current collector, a first active material layer, and a second active material layer. The first active material layer and the second active material layer have opposite polarities and are respectively disposed on both sides of the current collector.

25. The battery pack according to any one of claims 1-24, wherein, The electrode assembly includes a solid electrolyte layer, which includes a sulfide.

26. A battery device, wherein, include: Box; Multiple battery packs according to any one of claims 1-25, wherein the multiple battery packs are housed within the housing.

27. The battery device according to claim 26, wherein, The outer shell is connected to the box body.

28. An electrical appliance, wherein, Includes the battery pack according to any one of claims 1-25.

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