Battery pack, battery device and electric device

Abstract

Provided in the present application are a battery pack, a battery device and an electric device. The battery pack comprises a plurality of electrode assemblies, a casing, and a pressure relief mechanism, wherein the plurality of electrode assemblies are stacked in sequence, and each electrode assembly comprises a first electrode sheet, a solid electrolyte layer and a second electrode sheet, the first electrode sheet and the second electrode sheet having opposite polarities, and the solid electrolyte layer being arranged between the first electrode sheet and the second electrode sheet. The casing has a sealed space, and the plurality of electrode assemblies are accommodated in the sealed space. The pressure relief mechanism is arranged on the casing and is configured to release the released substances from the sealed space. By providing the casing with a sealed space in which the plurality of electrode assemblies are accommodated, the generated harmful gases can be sealed in the casing, thereby reducing the risk of the leakage of harmful gases. By means of the provision of the pressure relief mechanism, when the pressure in the sealed space reaches a threshold value, the pressure relief mechanism can release the released substances from the sealed space, thereby reducing the risk of explosions and fires in the battery pack, and facilitating an improvement in 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, current battery reliability 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 plurality of electrode components, a housing, and a pressure relief mechanism. The plurality of electrode components are stacked sequentially, each electrode component including a first electrode, a solid electrolyte layer, and a second electrode, the first electrode and the second electrode having opposite polarities, and the solid electrolyte layer being disposed between the first electrode and the second electrode. The housing has a sealed space, within which the plurality of electrode components are accommodated. The pressure relief mechanism is disposed on the housing and configured to release emissions within the sealed space.

[0005] In the above technical solution, the electrode assembly of the battery pack includes a solid electrolyte layer, which generates harmful gases during use. By creating a sealed space within the casing, multiple electrode assemblies are housed within this sealed space, effectively sealing the generated harmful gases within the casing. This reduces the risk of leakage and harm to human health, thus improving the reliability of the battery pack. Furthermore, by incorporating a pressure relief mechanism, when the pressure within the sealed space reaches a threshold, the mechanism can release the emissions, thereby reducing the risk of explosion or fire in the battery pack and further enhancing its reliability.

[0006] As an optional technical solution in this application embodiment, the outer shell has a first wall portion, the pressure relief mechanism is separately disposed with the first wall portion, the first wall portion is provided with a pressure relief hole, and the pressure relief mechanism is connected to the first wall portion and covers the pressure relief hole.

[0007] In the above technical solution, the pressure relief mechanism is separately set and connected to the first wall portion to facilitate processing and manufacturing.

[0008] As an optional technical solution in this application embodiment, the battery pack further includes a protective component, which is connected to the first wall portion and covers the pressure relief hole. The protective component is located on the side of the pressure relief mechanism away from the electrode assembly.

[0009] In the above technical solution, by setting a protective component to cover the pressure relief hole and positioning the protective component on the side of the pressure relief mechanism away from the electrode assembly, the protective component can, on the one hand, protect the pressure relief mechanism, reducing the risk of external impacts and making it less likely to open prematurely, thus improving the reliability of the battery pack. On the other hand, the protective component can reduce the risk of external impurities falling into the pressure relief hole, making it less likely to adversely affect the pressure relief mechanism, allowing it to open normally when the pressure in the sealed space reaches the threshold, further improving the reliability of the battery pack.

[0010] As an optional technical solution in this application embodiment, the outer shell has a first wall portion, and the pressure relief mechanism is integrally formed with the first wall portion.

[0011] In the above technical solution, the pressure relief mechanism is integrally formed with the first wall, eliminating the need for additional welding or bonding processes, thus improving the sealing performance of the outer casing. Furthermore, during production, it is easier to ensure that the detonation pressure of multiple battery packs produced is more consistent.

[0012] As an optional technical solution in this application embodiment, the pressure relief mechanism is provided with a first groove, and the pressure relief mechanism is configured to crack along at least a portion of the first groove when the pressure in the sealed space reaches a threshold.

[0013] In the above technical solution, a weak part is formed on the pressure relief mechanism by setting a first groove. When the pressure in the sealed space reaches the threshold, the pressure relief mechanism is more likely to crack along the weak part, thereby facilitating the release of the discharge in the sealed space. The structure is simple and easy to process.

[0014] As an optional technical solution in this application embodiment, the first groove is an annular groove.

[0015] In the above technical solution, when the first groove is an annular groove and the pressure in the sealed space reaches the threshold, the pressure relief mechanism can easily crack along the entire circumference of the first groove, thereby opening a larger opening, which facilitates rapid pressure relief of the battery pack and helps improve the reliability of the battery pack.

[0016] As an optional technical solution in this application embodiment, the battery pack includes a first processing mechanism disposed inside the housing, the first processing mechanism being used to reduce the concentration of at least one harmful gas in the emissions.

[0017] In the above technical solution, by setting up a first processing mechanism to reduce the concentration of at least one harmful gas in the emissions, the concentration of harmful gas in the emissions released by the pressure relief mechanism is lower, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack.

[0018] As an optional technical solution in this application embodiment, the first processing mechanism includes a first adsorption element, which is disposed inside the outer shell and is used to adsorb at least one of the harmful gases.

[0019] In the above technical solution, at least one harmful gas is adsorbed by the first adsorbent to reduce the concentration of at least one harmful gas in the emissions, which is less likely to affect other components in the battery pack and helps to improve the reliability of the battery pack.

[0020] As an optional technical solution in this application embodiment, the first processing mechanism includes a first medium providing mechanism, which is used to provide the sealed space with a reaction medium for reacting with the harmful gas.

[0021] In the above technical solution, the first medium providing mechanism can provide a reaction medium into the sealed space. The reaction medium can chemically react with the harmful gas, thereby reducing the concentration of at least one harmful gas in the emissions. Through chemical reaction, the harmful gas is treated more thoroughly, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack.

[0022] 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.

[0023] 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.

[0024] 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 and a second wall disposed opposite to each other, at least one of the first wall and the second wall is provided with the pressure relief mechanism, a portion of the circuit board is disposed between the second wall and the electrode assembly, the second 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 second wall.

[0025] In the above technical solution, the connector extends from the outer shell through the first lead-out hole, facilitating electrical connection between the connector and external components to transmit information collected by the acquisition component to the external components. By sealing the connector to the second wall, 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.

[0026] 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 the first seal is used to seal the connector and the second wall portion.

[0027] 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 second wall, thereby sealing the connector and the second wall, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0028] 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 and a second wall portion disposed opposite to each other. At least one of the first wall portion and the second wall portion is provided with the pressure relief mechanism. A portion of the circuit board is disposed between the second wall portion and the electrode assemblies. The second 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 second wall portion. The second lead-out portion extends out of the housing from the third lead-out hole and is sealed to the second wall portion.

[0029] 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 and the second lead serves as the positive output terminal of the battery pack, and the other serves as the negative output terminal. The first lead extends out of the outer casing from the second lead hole, and the second lead extends out of the outer casing from the third lead hole, facilitating connection with external electrical connection components and enabling the output or input of electrical energy into the battery pack. The first lead is sealed to the second wall, thus sealing both the first lead and the second wall, and the second lead is sealed to the second wall, thus sealing both the second lead and the second wall. This reduces the risk of harmful gas leakage and improves the reliability of the battery pack.

[0030] As an optional technical solution in this application embodiment, the battery pack includes a second sealing member, the second sealing member being disposed around the second lead-out hole, the second sealing member being used to seal the first lead-out portion and the second wall portion; and / or the battery pack includes a third sealing member, the third sealing member being disposed around the third lead-out hole, the third sealing member being used to seal the second lead-out portion and the second wall portion.

[0031] 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 between the circuit board and the second wall portion, thereby sealing the first lead-out portion and the second 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 between the circuit board and the second wall portion, thereby sealing the second lead-out portion and the second wall portion. This also helps reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0032] 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.

[0033] 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.

[0034] 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 second wall portion.

[0035] In the above technical solution, by setting a locking attachment, the circuit board is locked to the second 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.

[0036] As an optional technical solution in this application embodiment, the first electrode, the solid electrolyte layer and the second electrode are stacked along a first direction; the outer shell includes a third wall and a fourth wall, which are arranged opposite to each other along the first direction, and the third wall and the fourth wall cooperate to press together a plurality of electrode assemblies.

[0037] In the above technical solution, the third wall portion and the fourth wall portion cooperate to compress the electrode assembly along the first direction, thereby pressing the first electrode, the solid electrolyte layer and the second electrode together, so that the first electrode and the solid electrolyte layer, and the second electrode and the solid electrolyte layer can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack.

[0038] As an optional technical solution in this application embodiment, the plurality of electrode components are arranged along the first direction.

[0039] 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 stacking the first electrode, solid electrolyte layer and second electrode, the third wall portion and the fourth wall portion can cooperate to compress multiple electrode components along the first direction, thereby pressing the first electrode, solid electrolyte layer and second electrode of multiple electrode components together, thereby facilitating ion transport and reducing the internal resistance of the battery pack.

[0040] As an optional technical solution in this application embodiment, the outer shell includes a fifth wall portion and a sixth wall portion, the fifth wall portion and the sixth wall portion are disposed opposite to each other along a second direction, the fourth wall portion connects the fifth wall portion and the sixth wall portion, the fourth wall portion, the fifth wall portion and the sixth wall portion are integrally formed to form a shell having a first opening in the first direction, the third wall portion closes the first opening, and the second direction is perpendicular to the first direction.

[0041] In the above technical solution, the fourth, fifth, and sixth walls are integrally formed into a shell, while the third wall is separately disposed and connected to the shell. During assembly, multiple electrode assemblies can be first housed within the shell, then the third wall presses the multiple electrode assemblies against the fourth wall along a first direction, and finally the third wall is connected to the shell. In this way, the third and fourth walls can be easily fitted together to press multiple electrode assemblies during assembly.

[0042] 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 second wall portion, the first wall portion and the second 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.

[0043] 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.

[0044] As an optional technical solution in this application embodiment, the outer shell includes a fifth wall portion and a sixth wall portion, the fifth wall portion and the sixth wall portion are disposed opposite to each other along a second direction, the fifth wall portion connects the third wall portion and the fourth wall portion, the third wall portion, the fourth wall portion and the fifth wall portion are integrally formed to form a shell having a fourth opening in the second direction, and the sixth 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.

[0045] In the above technical solution, the third, fourth and fifth walls are integrally formed to form the shell, and the sixth 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 sixth 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, making assembly simpler and more convenient.

[0046] 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 second wall portion, the first wall portion and the second 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.

[0047] 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.

[0048] As an optional technical solution in this application embodiment, the outer shell includes a fifth wall portion and a sixth wall portion, the fifth wall portion and the sixth wall portion are disposed opposite to each other along a second direction, the third wall portion, the fifth wall portion, the fourth wall portion and the sixth wall portion are connected end to end in sequence, the third wall portion, the fifth wall portion, the fourth wall portion and the sixth 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 second wall portion, the first wall portion and the second wall portion respectively close the second opening and the third opening, the first direction, the second direction and the third direction are perpendicular to each other.

[0049] In the above technical solution, the third wall, the fifth wall, the fourth wall and the sixth 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 second wall. The assembly steps are fewer and the assembly efficiency is higher.

[0050] As an optional technical solution in this application embodiment, the electrode assembly is not encapsulated and is directly housed within the housing.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In the above technical solution, by setting a separator to separate two adjacent electrode components, when one electrode component is damaged, it is less likely to affect the use of other electrode components, which helps to improve the reliability of the battery pack.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] As an optional technical solution in this application embodiment, the separator is made of heat-insulating material.

[0061] 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.

[0062] As an optional technical solution in this application embodiment, the solid electrolyte layer includes sulfides.

[0063] 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.

[0064] 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.

[0065] As an optional technical solution in this application embodiment, the battery device includes a second processing mechanism, which is disposed inside the housing and located outside the outer shell. The second processing mechanism is used to reduce the concentration of at least one harmful gas in the emissions.

[0066] In the above technical solution, by setting up a second processing mechanism to reduce the concentration of at least one harmful gas in the emissions, the concentration of harmful gas in the box is lower, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack.

[0067] As an optional technical solution in this application embodiment, the second processing mechanism includes a second adsorption element, which is disposed inside the box and located on the outside of the outer shell. The second adsorption element is used to adsorb at least one of the harmful gases.

[0068] In the above technical solution, at least one harmful gas is adsorbed by the second adsorbent to reduce the concentration of at least one harmful gas in the emissions. This is less likely to affect other components inside the box and helps to improve the reliability of the battery device.

[0069] As an optional technical solution in this application embodiment, the second processing mechanism includes a second medium providing mechanism, which is used to provide a reaction medium for reacting with the harmful gas into the box.

[0070] In the above technical solution, the second medium supply mechanism can provide a reaction medium into the sealed space. The reaction medium can chemically react with the harmful gas, thereby reducing the concentration of at least one harmful gas in the emissions. Through chemical reaction, the harmful gas is treated more thoroughly, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack.

[0071] As an optional technical solution in this application embodiment, the battery device includes a concentration sensor and an alarm. The concentration sensor is disposed inside the box and is used to detect the concentration of harmful gases emitted by the material inside the box. The alarm responds to the concentration sensor.

[0072] In the above technical solution, a concentration sensor is set up to detect the concentration of harmful gases emitted inside the chamber. When the concentration sensor detects that the concentration of harmful gases exceeds the threshold, the alarm sounds, indicating that the concentration of harmful gases exceeds the standard and needs to be dealt with.

[0073] As an optional technical solution in this application embodiment, the outer shell is connected to the box body.

[0074] 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.

[0075] Thirdly, embodiments of this application also provide an electrical device, which includes the aforementioned battery pack. Attached Figure Description

[0076] 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.

[0077] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0078] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0079] Figure 3 is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0080] Figure 4 is an exploded view of a battery pack provided in some embodiments of this application;

[0081] Figure 5 is a cross-sectional view of an electrode assembly provided in some embodiments of this application;

[0082] Figure 6 is a partial cross-sectional view of the first wall portion provided in some embodiments of this application;

[0083] Figure 7 is a partial cross-sectional view of the first wall portion provided in some other embodiments of this application;

[0084] Figure 8 is an exploded view of a circuit board and a second wall provided in some embodiments of this application;

[0085] Figure 9 is an exploded view of the third wall and the shell provided in some embodiments of this application;

[0086] Figure 10 is an exploded view of a battery pack provided in some other embodiments of this application;

[0087] Figure 11 is an exploded view of the sixth wall and the shell provided in some other embodiments of this application;

[0088] Figure 12 is an exploded view of a battery pack provided in some embodiments of this application;

[0089] Figure 13 is a cross-sectional view of a battery pack provided in some embodiments of this application;

[0090] Figure 14 is a cross-sectional view of a battery pack provided in some other embodiments of this application.

[0091] Icons: 10-Box; 11-First Part; 12-Second Part; 20-Battery Pack; 21-Casing; 211-First Wall; 2111-Pressure Relief Hole; 212-Second Wall; 2121-First Outlet Hole; 2122-Second Outlet Hole; 2123-Third Outlet Hole; 2124-First Mounting Hole; 2125-Second Mounting Hole; 2126-Third Mounting Hole; 213-Casing; 2131-Fourth Wall; 2132-Fifth Wall; 2133-Sixth Wall; 2134-First Opening; 2135-Second Opening; 2136-Third Opening; 2137-Fourth Opening; 214-Third Wall; 22-Electrode Assembly; 221-First Electrode; 222-Second Electrode; 223-Solid Electrolyte Layer; 23 - Circuit board; 231- Acquisition component; 2311- Connector; 2312- First seal; 232- Busbar 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; 29- Pressure relief mechanism; 291- Protective component; 292- First groove; 100- Battery device; 200- Controller; 300- Motor; 1000- Vehicle. Detailed Implementation

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] In this application, "multiple" means two or more (including two).

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.).

[0103] 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.

[0104] 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.

[0105] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0106] 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.

[0107] 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.

[0108] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0109] 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.

[0110] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0111] 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.

[0112] 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.

[0113] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0114] In some implementations, the electrode assembly is a stacked structure.

[0115] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0116] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, the battery device may be a battery pack, which may include a housing and multiple battery packs housed within the housing.

[0121] As an example, the battery pack can be housed in a casing in a way that is fixed within the casing.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] Therefore, this application provides a battery pack including multiple electrode assemblies, a housing, and a pressure relief mechanism. The multiple electrode assemblies are stacked sequentially, and each electrode assembly includes a first electrode, a solid electrolyte layer, and a second electrode. The first and second electrodes have opposite polarities, and the solid electrolyte layer is disposed between the first and second electrodes. The housing has a sealed space, within which the multiple electrode assemblies are housed. The pressure relief mechanism is disposed in the housing and configured to release emissions from the sealed space.

[0130] The battery pack's electrode assembly includes a solid electrolyte layer, which generates harmful gases during use. By creating a sealed space within the casing, multiple electrode assemblies are housed within this sealed space. This effectively seals the generated harmful gases within the casing, reducing the risk of leakage and harm to human health, thus improving the battery pack's reliability. Furthermore, a pressure relief mechanism is incorporated. When the pressure within the sealed space reaches a threshold, the mechanism releases the emissions, further reducing the risk of explosion and fire, and enhancing the battery pack's reliability.

[0131] 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.

[0132] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] Please refer to Figures 3, 4, 5, and 6. 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. Figure 6 is a partial cross-sectional view of a first wall portion 211 provided in some embodiments of this application. This application provides a battery pack 20, which includes multiple electrode assemblies 22, a housing 21, and a pressure relief mechanism 29. Multiple electrode assemblies 22 are stacked sequentially. Each electrode assembly 22 includes a first electrode 221, a solid electrolyte layer 223, and a second electrode 222. The first electrode 221 and the second electrode 222 have opposite polarities. The solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222. The housing 21 has a sealed space in which multiple electrode assemblies 22 are accommodated. The pressure relief mechanism 29 is disposed on the housing 21 and is configured to release emissions from the sealed space.

[0141] 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.

[0142] 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.

[0143] The battery pack 20 may include several or dozens of electrode components 22, and of course, the battery pack 20 may also include more electrode components 22.

[0144] Electrode assembly 22 is the component in battery pack 20 where electrochemical reactions occur. Multiple electrode assemblies 22 may be contained within the casing 21. Electrode assembly 22 is mainly formed by stacking positive electrode plates, a solid electrolyte layer 223, and a negative electrode plate. The portions of the positive and negative electrode plates containing active material constitute the main body of electrode assembly 22, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends. During the charging and discharging process of battery pack 20, the positive and negative active materials react with the solid electrolyte layer 223.

[0145] One of the first electrode 221 and the second electrode 222 is the positive electrode, and the other is the negative electrode. For example, when the first electrode 221 is the positive electrode, the second electrode 222 is the negative electrode. Or, for instance, when the first electrode 221 is the positive electrode, the second electrode 222 is the negative electrode.

[0146] The solid electrolyte layer 223 includes a polymer solid electrolyte layer, an inorganic solid electrolyte layer, and a composite solid electrolyte layer.

[0147] 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.

[0148] 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.

[0149] As an example, a composite solid electrolyte layer is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0150] The pressure relief mechanism 29 is a component used to open when the internal pressure or temperature of the battery pack 20 reaches a threshold, thereby releasing the internal pressure of the battery pack 20. The pressure relief mechanism 29 can be disposed on any wall of the housing 21. In some embodiments, the housing 21 has a first wall 211, and the pressure relief mechanism 29 is disposed on the first wall 211. The pressure relief mechanism 29 can be a component mounted on the first wall 211, in which case the pressure relief mechanism 29 and the first wall 211 are separately disposed but connected. For example, the pressure relief mechanism 29 is an explosion-proof plate mounted on the first wall 211. The pressure relief mechanism 29 can also be part of the first wall 211, in which case the pressure relief mechanism 29 and the first wall 211 are integrally formed. The location of the pressure relief mechanism 29 can be used to determine which wall of the housing 21 is the first wall 211.

[0151] The pressure relief mechanism 29 may have a weak portion, which allows the mechanism to crack along the weak portion when the internal pressure or temperature of the battery pack 20 reaches a threshold, thereby releasing the internal pressure of the battery pack 20. In some embodiments, the strength of the pressure relief mechanism 29 at the weak portion may be lower than the strength at other locations, so that the weak portion can crack under the internal pressure when the internal pressure or temperature of the battery pack 20 reaches the threshold, thereby releasing the internal pressure of the battery pack 20. In other embodiments, the melting point of the pressure relief mechanism 29 at the weak portion may be lower than the melting point at other locations, so that the weak portion can crack under high temperature when the internal pressure or temperature of the battery pack 20 reaches the threshold, thereby releasing the internal pressure of the battery pack 20.

[0152] The emissions from the battery pack 20 mentioned in this application embodiment include, but are not limited to: solid electrolyte, split positive and negative electrode plates, harmful gases generated by the reaction, flames, etc.

[0153] The electrode assembly 22 of the battery pack 20 includes a solid electrolyte layer 223, which generates harmful gases during use. By providing a sealed space within the outer casing 21, multiple electrode assemblies 22 are housed within this sealed space, effectively sealing the generated harmful gases within the casing 21. This reduces the risk of harmful gas leakage and its potential harm to human health, thereby improving the reliability of the battery pack 20. Furthermore, by incorporating a pressure relief mechanism 29, when the pressure within the sealed space reaches a threshold, the mechanism releases the emissions, further reducing the risk of explosion or fire in the battery pack 20 and enhancing its overall reliability.

[0154] Referring to Figure 6, in some embodiments, the outer casing 21 has a first wall portion 211, and the pressure relief mechanism 29 is separately disposed from the first wall portion 211. The first wall portion 211 is provided with a pressure relief hole 2111, and the pressure relief mechanism 29 is connected to the first wall portion 211 and covers the pressure relief hole 2111.

[0155] The phrase "the pressure relief mechanism 29 is separately provided from the first wall portion 211, the first wall portion 211 is provided with a pressure relief hole 2111, and the pressure relief mechanism 29 is connected to the first wall portion 211 and covers the pressure relief hole 2111" means that during manufacturing, a pressure relief hole 2111 is provided on the first wall portion 211, and the pressure relief mechanism 29 and the first wall portion 211 are provided separately and then finally connected together. For example, the pressure relief mechanism 29 can be welded to the first wall portion 211. The pressure relief mechanism 29 can be an explosion-proof plate installed on the first wall portion 211.

[0156] The pressure relief mechanism 29 is separately provided and connected to the first wall portion 211 to facilitate processing and manufacturing.

[0157] Referring to Figure 6, in some embodiments, the battery pack 20 further includes a protective member 291, which is connected to the first wall portion 211 and covers the pressure relief hole 2111. The protective member 291 is located on the side of the pressure relief mechanism 29 away from the electrode assembly 22.

[0158] A protective element 291 is disposed on the first wall portion 211, covering the pressure relief hole 2111. The protective element 291 prevents external impurities from entering the pressure relief hole 2111, thereby protecting the pressure relief mechanism 29. The protective element 291 may be made of insulating material to provide insulation. Optionally, the protective element 291 is sheet-shaped and is adhered to the first wall portion 211.

[0159] The protective element 291 is located on the side of the pressure relief mechanism 29 away from the electrode assembly 22, that is, the pressure relief mechanism 29 is closer to the electrode assembly 22 than the protective element 291. Optionally, the pressure relief mechanism 29 is disposed at the end of the pressure relief hole 2111 closer to the electrode assembly 22, and the protective element 291 is disposed at the end of the pressure relief hole 2111 away from the electrode assembly 22.

[0160] By providing a protective element 291 to cover the pressure relief hole 2111 and positioning the protective element 291 on the side of the pressure relief mechanism 29 away from the electrode assembly 22, the protective element 291 protects the pressure relief mechanism 29, reducing the risk of external impacts and making it less likely to open prematurely, thus improving the reliability of the battery pack 20. Furthermore, the protective element 291 reduces the risk of external impurities falling into the pressure relief hole 2111, minimizing their adverse effects on the pressure relief mechanism 29. This ensures that the pressure relief mechanism 29 can open normally when the pressure in the sealed space reaches the threshold, further enhancing the reliability of the battery pack 20.

[0161] Please refer to Figure 7, which is a partial cross-sectional view of the first wall portion 211 provided in some other embodiments of this application. In some other embodiments, the housing 21 has the first wall portion 211, and the pressure relief mechanism 29 is integrally formed with the first wall portion 211.

[0162] "One-piece molding" means that the first wall portion 211 and the pressure relief mechanism 29 are provided as a single structure. For example, the pressure relief mechanism 29 can be formed on the first wall portion 211 by means of stamping or cold forging.

[0163] The pressure relief mechanism 29 is integrally formed with the first wall portion 211, eliminating the need for additional welding or bonding processes, resulting in better sealing of the outer casing 21. Furthermore, during production, it is easier to ensure that the detonation pressure of multiple battery packs 20 produced is more consistent.

[0164] Referring to Figure 7, in some embodiments, the pressure relief mechanism 29 is provided with a first groove 292, and the pressure relief mechanism 29 is configured to split at least a portion along the first groove 292 when the pressure in the sealed space reaches a threshold.

[0165] The first groove 292 serves to relieve pressure, allowing the pressure relief mechanism 29 to crack along the first groove 292 when the internal pressure or temperature of the battery pack 20 reaches the explosion pressure, thereby releasing the internal pressure of the battery pack 20.

[0166] Optionally, the first groove 292 may be provided on the side of the pressure relief mechanism 29 facing the inside of the housing 21, or it may be provided on the side of the pressure relief mechanism 29 away from the inside of the housing 21. For example, in FIG7, the first groove 292 is provided on the side of the pressure relief mechanism 29 away from the inside of the housing 21, that is, the first groove 292 is provided on the surface of the side of the pressure relief mechanism 29 away from the inside of the housing 21.

[0167] The first groove 292 can be formed by various methods, such as stamping or cold heading. Stamping or cold heading the first groove 292 will cause the groove wall of the first groove 292 to undergo work hardening (the grain arrangement changes, resulting in lattice distortion, which reduces the plasticity of the metal and increases the hardness of the material), which enhances its resistance to external impact and makes it less susceptible to damage from external impact.

[0168] By setting a first groove 292 on the pressure relief mechanism 29, a weak position is formed on the pressure relief mechanism 29. When the pressure in the sealed space reaches the threshold, the pressure relief mechanism 29 is more likely to crack from the weak position, thereby facilitating the release of the discharge in the sealed space. The structure is simple and easy to process.

[0169] In some embodiments, the first groove 292 is an annular groove.

[0170] The first groove 292 can be a circular annular groove, an elliptical annular groove, or a racetrack-shaped groove.

[0171] When the first groove 292 is an annular groove, and the pressure in the sealed space reaches the threshold, the pressure relief mechanism 29 can easily crack along the entire circumference of the first groove 292, thereby opening a larger opening, which facilitates rapid pressure relief of the battery pack 20 and helps improve the reliability of the battery pack 20.

[0172] In other embodiments, the first groove 292 is a non-closed groove with a gap at both ends. For example, the first groove 292 can be a C-shaped groove, a U-shaped groove, etc.

[0173] In some embodiments, the battery pack 20 includes a first processing mechanism disposed within the housing 21, the first processing mechanism being used to reduce the concentration of at least one harmful gas in the emissions.

[0174] The first treatment unit is a structure used to reduce the concentration of at least one harmful gas in emissions. The first treatment unit can reduce the concentration of at least one harmful gas in emissions through physical adsorption, or it can reduce the concentration of at least one harmful gas in emissions through a chemical reaction.

[0175] By setting up a first treatment mechanism to reduce the concentration of at least one harmful gas in the emissions, the concentration of harmful gas in the emissions released by the pressure relief mechanism 29 is lower, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack 20.

[0176] In some embodiments, the first processing mechanism includes a first adsorption element disposed within the housing 21, the first adsorption element being used to adsorb at least one harmful gas.

[0177] The first adsorbent can be a porous structure, for example, activated carbon, foam, etc.

[0178] By adsorbing at least one harmful gas through the first adsorption element, the concentration of at least one harmful gas in the emissions is reduced, which is less likely to affect other components in the battery pack 20 and helps to improve the reliability of the battery pack 20.

[0179] In other embodiments, the first processing unit includes a first medium supply unit for supplying a reaction medium to the sealed space for reacting with the harmful gas.

[0180] The first medium supply mechanism can be a first medium container, which is disposed inside the housing 21, and the reaction medium is contained within the first medium container. Alternatively, the first medium supply mechanism can be a first spraying mechanism, used to spray the reaction medium into the housing 21. For example, the first spraying mechanism can spray the reaction medium into the housing when the pressure relief mechanism 29 is opened.

[0181] A reaction medium is a medium used to react with harmful gases. For example, when the harmful gas is acidic, the reaction medium can be an alkaline solvent, an alkaline compound, etc.

[0182] The first medium supply mechanism can provide a reaction medium into the sealed space. The reaction medium can chemically react with harmful gases, thereby reducing the concentration of at least one harmful gas in the emissions. Through chemical reaction, the harmful gases are treated more thoroughly, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack 20.

[0183] Please refer to Figure 8, which is an exploded view of the circuit board 23 and the second wall portion 212 provided in some embodiments of this application. 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 a plurality of electrode components 22 and is used to acquire information from the electrode components 22.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] Referring to Figure 8, 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 and a second wall 212 disposed opposite each other, at least one of which is provided with a pressure relief mechanism 29. A portion of the circuit board 23 is disposed between the second wall 212 and the electrode assembly 22. The second wall 212 is provided with a first lead-out hole 2121, and the connector 2311 extends out of the housing 21 from the first lead-out hole 2121, and is sealingly connected to the second wall 212.

[0189] The outer casing 21 includes a first wall portion 211 and a second wall portion 212, which are disposed opposite to each other. The pressure relief mechanism 29 may be disposed only in the first wall portion 211, or only in the second wall portion 212, or both in the first wall portion 211 and the second wall portion 212.

[0190] 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.

[0191] The second wall portion 212 is provided with a first lead-out hole 2121, which is a through hole extending through the second wall portion 212 along its thickness direction. The connector 2311 can extend out of the housing 21 from the first lead-out hole 2121 to facilitate electrical connection with external components. The position of the connector 2311 can be used to determine which wall portion of the housing 21 is the second wall portion 212.

[0192] The main body of the circuit board 23 is disposed between the second wall portion 212 and the electrode assembly 22. The connector 2311 extends out of the housing 21 from the first lead-out hole 2121. The connector 2311 and the second wall portion 212 form a sealed connection to prevent harmful gases inside the housing 21 from leaking out.

[0193] Connector 2311 extends from the housing 21 through the first lead-out hole 2121, 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 second wall portion 212, the risk of harmful gas leakage is reduced, thereby reducing the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack 20.

[0194] It should be noted that the connector 2311 and the pressure relief mechanism 29 can be located on the same wall of the housing 21, or they can be located on two different walls of the housing 21.

[0195] Referring to Figure 8, in some embodiments, the battery pack 20 includes a first seal 2312, which is disposed around the first outlet hole 2121 and is used to seal the connector 2311 and the second wall portion 212.

[0196] The first seal 2312 has sealing properties and is used to seal the connector 2311 and the second wall portion 212.

[0197] "The first seal 2312 is arranged around the first outlet hole 2121" means that in the projection plane perpendicular to the thickness direction of the second wall portion 212, 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 2121.

[0198] Since the connector 2311 extends out of the housing 21 from the first outlet hole 2121, the first seal 2312 is also arranged around the connector 2311. The first seal 2312 can abut between the circuit board 23 and the second wall portion 212. In this way, the first seal 2312 can prevent harmful gases from entering the first outlet hole 2121, so as to achieve a seal on the connector 2311 and the second wall portion 212.

[0199] The first sealing element 2312 can be a sealant, a gasket, a sealing ring, etc.

[0200] 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.

[0201] The first seal 2312 is arranged around the first lead hole 2121. Since the connector 2311 extends out of the housing 21 from the first lead hole 2121, the first seal 2312 is also arranged around the connector 2311. The first seal 2312 can abut against the circuit board 23 and the second wall portion 212, thereby sealing the connector 2311 and the second wall portion 212, which helps to reduce the risk of harmful gas leakage and improve the reliability of the battery pack 20.

[0202] Referring to Figure 8, in some embodiments, the circuit board 23 includes a bus assembly 232 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 and a second wall portion 212 disposed opposite to each other, at least one of which is provided with a pressure relief mechanism 29. A portion of the circuit board 23 is disposed between the second wall portion 212 and the electrode assembly 22. The second wall portion 212 is provided with a second lead-out hole 2122 and a third lead-out hole 2123. The first lead-out portion 2321 extends out of the housing 21 from the second lead-out hole 2122 and is sealed to the second wall portion 212. The second lead-out portion 2322 extends out of the housing 21 from the third lead-out hole 2123 and is sealed to the second wall portion 212.

[0203] 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.

[0204] 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.

[0205] The second wall portion 212 is provided with a second outlet hole 2122 and a third outlet hole 2123, both of which are through holes penetrating the second wall portion 212 along its thickness direction. A first outlet portion 2321 extends out of the outer casing 21 through the second outlet hole 2122 for connection to an external electrical connection component. A second outlet portion 2322 extends out of the outer casing 21 through the third outlet hole 2123 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.

[0206] The main body of the circuit board 23 is disposed between the second wall portion 212 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 2122 and the third lead-out hole 2123, respectively. The second lead-out portion 2322 forms a sealed connection with the second wall portion 212 to prevent harmful gases inside the outer casing 21 from leaking out.

[0207] In the above embodiments, connector 2311, first lead-out portion 2321, and second lead-out portion 2322 are all disposed on the second wall portion 212, 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.

[0208] 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 2122, and the second lead-out portion 2322 extends out of the outer casing 21 from the third lead-out hole 2123, 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 second wall portion 212, thereby sealing the first lead-out portion 2321 and the second wall portion 212. The second lead-out portion 2322 is sealed to the second wall portion 212, thereby sealing the second lead-out portion 2322 and the second wall portion 212. This helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0209] Referring to Figure 8, in some embodiments, the battery pack 20 includes a second seal 2325, which surrounds the second lead-out hole 2122 and seals the first lead-out portion 2321 and the second wall portion 212. And / or the battery pack 20 includes a third seal 2326, which surrounds the third lead-out hole 2123 and seals the second lead-out portion 2322 and the second wall portion 212.

[0210] The second seal 2325 has sealing properties and is used to seal the first lead-out portion 2321 and the second wall portion 212. "The second seal 2325 is arranged around the second lead-out hole 2122" means that in a projection plane perpendicular to the thickness direction of the second wall portion 212, 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 2122. Since the connector 2311 extends from the housing 21 through the second lead-out hole 2122, the second seal 2325 is also arranged around the connector 2311. The second seal 2325 can abut against the circuit board 23 and the second wall portion 212, thus preventing harmful gases from entering the second lead-out hole 2122, thereby achieving a seal for the first lead-out portion 2321 and the second wall portion 212. 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.

[0211] The third seal 2326 has sealing properties and is used to seal the second lead-out portion 2322 and the second wall portion 212. "The third seal 2326 is arranged around the third lead-out hole 2123" means that in a projection plane perpendicular to the thickness direction of the second wall portion 212, 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 2123. Since the connector 2311 extends from the housing 21 through the third lead-out hole 2123, the third seal 2326 is also arranged around the connector 2311. The third seal 2326 can abut between the circuit board 23 and the second wall portion 212, thus preventing harmful gases from entering the third lead-out hole 2123, thereby achieving a seal for the second lead-out portion 2322 and the second wall portion 212. 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.

[0212] The second seal 2325 is disposed around the second lead-out hole 2122. Since the first lead-out portion 2321 extends out of the outer casing 21 from the second lead-out hole 2122, 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 second wall portion 212, thereby sealing the first lead-out portion 2321 and the second wall portion 212, 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 2123. Since the second lead-out portion 2322 extends out of the outer casing 21 from the third lead-out hole 2123, 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 second wall portion 212, thereby sealing the second lead-out portion 2322 and the second wall portion 212, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0213] Referring to Figure 8, 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 2122. 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 2123.

[0214] 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 2122 to insulate and isolate the first lead-out portion 2321 and the second wall portion 212, thereby reducing the risk of short circuit due to contact between the first lead-out portion 2321 and the second wall portion 212. The material of the first insulating element 2327 can be plastic, rubber, etc.

[0215] Optionally, the first insulating element 2327 and the first lead-out portion 2321 are integrally injection molded.

[0216] 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 2123 to insulate and isolate the second lead-out portion 2322 and the second wall portion 212, thereby reducing the risk of short circuit due to contact between the second lead-out portion 2322 and the second wall portion 212. The material of the second insulating member 2328 can be plastic, rubber, etc.

[0217] Optionally, the second insulating element 2328 and the second lead-out portion 2322 are integrally injection molded.

[0218] 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 2122 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 2123 is reduced, which helps improve the reliability of the battery pack 20.

[0219] Referring to Figure 8, in some embodiments, the battery pack 20 includes a locking attachment 25, which is configured to lock the circuit board 23 and the second wall portion 212.

[0220] 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 2124, a second mounting hole 2125, and a third mounting hole 2126. The first lock accessory 251 passes through the first mounting hole 2124 and locks the circuit board 23 and the second wall portion 212. The second lock accessory 252 passes through the second mounting hole 2125 and locks the circuit board 23 and the second wall portion 212. The third lock accessory 253 passes through the third mounting hole 2126 and locks the circuit board 23 and the second wall portion 212.

[0221] 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 second wall portion 212.

[0222] In some embodiments, a first seal 2312 is disposed around a first mounting hole 2124 to seal a first lock attachment 251 and a second wall portion 212. A second seal 2325 is disposed around a second mounting hole 2125 to seal a second lock attachment 252 and a second wall portion 212. A third seal 2326 is disposed around a third mounting hole 2126 to seal a third lock attachment 253 and a second wall portion 212.

[0223] By setting the locking attachment 25, the circuit board 23 is locked to the second wall portion 212, 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.

[0224] Please refer to Figures 4 and 9. Figure 9 is an exploded view of the third wall portion 214 and the housing 213 provided in some embodiments of this application. In some embodiments, the first electrode 221, the solid electrolyte layer 223, and the second electrode 222 are stacked along a first direction. The housing 21 includes a third wall portion 214 and a fourth wall portion 2131, which are disposed opposite to each other along the first direction. The third wall portion 214 and the fourth wall portion 2131 cooperate to press together a plurality of electrode assemblies 22.

[0225] The first electrode 221, the solid electrolyte layer 223, and the second electrode 222 are stacked, meaning the electrode assembly 22 is a stacked electrode assembly. The first direction is the stacking direction of the first electrode 221, the solid electrolyte layer 223, and the second electrode 222. Please refer to Figure 9; the first direction is the X direction shown in the figure.

[0226] The third wall portion 214 and the fourth wall portion 2131 are two wall portions of the outer casing 21 that are arranged opposite each other along the first direction. Along the first direction, a plurality of electrode assemblies 22 are disposed between the third wall portion 214 and the fourth wall portion 2131. The third wall portion 214 and the fourth wall portion 2131 cooperate to press the plurality of electrode assemblies 22 to compress the first electrode 221, the solid electrolyte layer 223 and the second electrode 222.

[0227] The third wall portion 214 and the fourth wall portion 2131 cooperate to compress the electrode assembly 22 along the first direction, thereby pressing the first electrode 221, the solid electrolyte layer 223 and the second electrode 222 together, so that the first electrode 221 and the solid electrolyte layer 223, and the second electrode 222 and the solid electrolyte layer 223 can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack 20.

[0228] Referring to Figures 4 and 9, in some embodiments, a plurality of electrode assemblies 22 are arranged along a first direction.

[0229] 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 stacking direction of the first electrode 221, the solid electrolyte layer 223 and the second electrode 222.

[0230] By arranging multiple electrode components 22 along a first direction, that is, arranging multiple electrode components 22 in the same direction as the stacking direction of the first electrode 221, the solid electrolyte layer 223, and the second electrode 222, the third wall portion 214 and the fourth wall portion 2131 can cooperate to compress multiple electrode components 22 along the first direction, thereby pressing the first electrode 221, the solid electrolyte layer 223, and the second electrode 222 of multiple electrode components 22 together, thereby facilitating ion transport and reducing the internal resistance of the battery pack 20.

[0231] Referring to Figures 4 and 9, in some embodiments, the outer casing 21 includes a fifth wall portion 2132 and a sixth wall portion 2133, which are disposed opposite to each other along a second direction. A fourth wall portion 2131 connects the fifth wall portion 2132 and the sixth wall portion 2133. The fourth wall portion 2131, the fifth wall portion 2132, and the sixth wall portion 2133 are integrally formed to form a casing 213 having a first opening 2134 in a first direction. A third wall portion 214 closes the first opening 2134. The second direction is perpendicular to the first direction.

[0232] The fifth wall portion 2132 and the sixth wall portion 2133 are two wall portions of the outer casing 21 that are arranged opposite each other along a second direction. The second direction is perpendicular to the first direction. Please refer to Figure 9. The second direction can be the Y direction shown in the figure.

[0233] The fourth wall portion 2131 connects to the fifth wall portion 2132 and the sixth wall portion 2133, and the fourth wall portion 2131, the fifth wall portion 2132, and the sixth wall portion 2133 are integrally formed. The fourth wall portion 2131, the fifth wall portion 2132, and the sixth 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.

[0234] The third wall portion 214 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 third wall portion 214 is separately disposed from the housing 213 and connected thereto. For example, the third wall portion 214 may be welded to the housing 213.

[0235] The housing 213 is formed by integrally molding the fourth wall portion 2131, the fifth wall portion 2132, and the sixth wall portion 2133. The third wall portion 214 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 third wall portion 214 can be used to press the multiple electrode assemblies 22 against the fourth wall portion 2131 along a first direction. After that, the third wall portion 214 is connected to the housing 213. In this way, the third wall portion 214 and the fourth wall portion 2131 can be easily used to press the multiple electrode assemblies 22 together during assembly.

[0236] Referring to Figures 4 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 second wall portion 212, 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 direction, the second direction, and the third direction are perpendicular to each other.

[0237] 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 9. The third direction can be the Z direction shown in the figure.

[0238] The outer casing 21 includes a first wall portion 211 and a second wall portion 212. The first wall portion 211 closes the second opening 2135, and the second wall portion 212 closes the third opening 2136. The first wall portion 211, the second wall portion 212, the third wall portion 214, and the casing 213 together define a sealed space.

[0239] "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.

[0240] 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.

[0241] Please refer to Figures 10 and 11. Figure 10 is an exploded view of a battery pack 20 provided in some embodiments of this application. Figure 11 is an exploded view of a sixth wall portion 2133 and a housing 213 provided in some embodiments of this application. In some embodiments, the housing 21 includes a fifth wall portion 2132 and a sixth wall portion 2133, which are disposed opposite to each other along a second direction. The fifth wall portion 2132 connects the third wall portion 214 and the fourth wall portion 2131. The third wall portion 214, the fourth wall portion 2131, and the fifth wall portion 2132 are integrally formed to form a housing 213 having a fourth opening 2137 in the second direction. The sixth 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, and the second direction is perpendicular to the first direction.

[0242] The fifth wall portion 2132 connects the third wall portion 214 and the fourth wall portion 2131, which are integrally formed. The third wall portion 214, the fourth wall portion 2131, and the fifth wall portion 2132 together form a shell 213, which has a fourth opening 2137 at one end along the second direction. The shell 213 has a U-shaped structure, with the opening end of the U-shape located in the second direction.

[0243] The sixth 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 sixth wall portion 2133 is separately provided and connected to the housing 213. For example, the sixth wall portion 2133 can be welded to the housing 213.

[0244] By integrally forming the third wall portion 214, the fourth wall portion 2131, and the fifth wall portion 2132 to form the housing 213, and separately setting and connecting the sixth 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 sixth 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.

[0245] Referring to Figures 10 and 11, 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 outer shell 21 also includes a first wall portion 211 and a second wall portion 212, which respectively close the second opening 2135 and the third opening 2136. 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, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0246] The outer casing 21 includes a first wall portion 211 and a second wall portion 212. The first wall portion 211 closes the second opening 2135, and the second wall portion 212 closes the third opening 2136. The first wall portion 211, the second wall portion 212, the casing 213, and the sixth wall portion 2133 together define a sealed space.

[0247] 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.

[0248] 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.

[0249] Please refer to Figure 12, 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 fifth wall portion 2132 and a sixth wall portion 2133, which are disposed opposite to each other along a second direction. The third wall portion 214, the fifth wall portion 2132, the fourth wall portion 2131, and the sixth wall portion 2133 are connected end to end in sequence. The third wall portion 214, the fifth wall portion 2132, the fourth wall portion 2131, and the sixth wall portion 2133 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 second wall portion 212, 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.

[0250] The third wall portion 214 and the fourth wall portion 2131 are arranged opposite each other along a first direction, the fifth wall portion 2132 and the sixth wall portion 2133 are arranged opposite each other along a second direction, and the first wall portion 211 and the second wall portion 212 are arranged opposite each other along a third direction. The third wall portion 214, the fifth wall portion 2132, the fourth wall portion 2131 and the sixth wall portion 2133 are connected end to end to form a cylindrical structure. The third wall portion 214, the fifth wall portion 2132, the fourth wall portion 2131 and the sixth 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 both ends along the third direction, respectively. The first wall portion 211 closes the second opening 2135, and the second wall portion 212 closes the third opening 2136. The first wall portion 211, the second wall portion 212 and the shell 213 together define a sealed space.

[0251] The third wall portion 214, the fifth wall portion 2132, the fourth wall portion 2131, and the sixth 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 second wall portion 212. The assembly steps are fewer and the assembly efficiency is higher.

[0252] Please refer to Figure 13, 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.

[0253] "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.

[0254] 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.

[0255] Referring to Figure 13, 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.

[0256] 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.

[0257] Optionally, the third insulating element 26 is an insulating adhesive disposed between the electrode assembly 22 and the housing 21.

[0258] 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.

[0259] Referring to Figure 13, 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.

[0260] 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.

[0261] 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.

[0262] Please refer to Figure 14, 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.

[0263] 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.

[0264] The packaging bag 28 can be a soft outer shell, such as aluminum-plastic film, heat shrink film, etc.

[0265] 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.

[0266] Referring to Figure 14, 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.

[0267] 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.

[0268] 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.

[0269] In some embodiments, the separator 27 is made of heat-insulating material.

[0270] 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.

[0271] 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.

[0272] In some embodiments, the solid electrolyte layer 223 comprises a sulfide.

[0273] When the solid electrolyte layer 223 includes sulfides, the electrode assembly 22 will generate hydrogen sulfide during use. Hydrogen sulfide is highly harmful to human health, so it is even more necessary to seal it through the outer shell 21.

[0274] 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.

[0275] 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.

[0276] In some embodiments, the battery device 100 includes a second processing mechanism disposed within the housing 10 and located outside the housing 21, the second processing mechanism being used to reduce the concentration of at least one harmful gas in the emissions.

[0277] The second treatment mechanism is a structure used to reduce the concentration of at least one harmful gas in the emissions within the housing 10. The second treatment mechanism can reduce the concentration of at least one harmful gas in the emissions within the housing 10 through physical adsorption, or it can reduce the concentration of at least one harmful gas in the emissions within the housing 10 through a chemical reaction.

[0278] By setting up a second treatment mechanism to reduce the concentration of at least one harmful gas in the emissions, the concentration of harmful gases in the housing 10 is lower, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack 20.

[0279] In some embodiments, the second processing mechanism includes a second adsorption element disposed inside the housing 10 and located outside the housing 21, the second adsorption element being used to adsorb at least one harmful gas.

[0280] The second adsorbent can be a porous structure, for example, activated carbon, foam, etc.

[0281] By adsorbing at least one harmful gas through the second adsorption element, the concentration of at least one harmful gas in the emissions is reduced, which is less likely to affect other components inside the housing 10 and helps to improve the reliability of the battery device 100.

[0282] In other embodiments, the second processing unit includes a second medium supply unit for supplying a reaction medium for reacting with harmful gases into the housing 10.

[0283] The second medium supply mechanism can be a second medium container, which is disposed inside the housing 10, and the reaction medium is contained within the second medium container. Alternatively, the second medium supply mechanism can be a second spraying mechanism, which is used to spray the reaction medium into the housing 10.

[0284] A reaction medium is a medium used to react with harmful gases. For example, when the harmful gas is acidic, the reaction medium can be an alkaline solvent, an alkaline compound, etc.

[0285] The second medium supply mechanism can provide a reaction medium into the sealed space. The reaction medium can chemically react with harmful gases, thereby reducing the concentration of at least one harmful gas in the emissions. Through chemical reaction, the harmful gases are treated more thoroughly, which helps to reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack 20.

[0286] In some embodiments, the battery device 100 includes a concentration sensor and an alarm. The concentration sensor is disposed within the housing 10 and is used to detect the concentration of harmful gases emitted within the housing 10. The alarm is responsive to the concentration sensor.

[0287] The concentration sensor is a structure used to detect the concentration of harmful gases emitted within the enclosure 10. The concentration sensor is electrically connected to the alarm, either directly or indirectly through an intermediate component. For example, the intermediate component could be a controller 200, with the concentration sensor electrically connected to the controller 200, and the controller 200 electrically connected to the alarm.

[0288] An alarm is an electronic device that uses sound, light, air pressure, or other means to alert or warn us to take certain actions in order to prevent or mitigate the consequences of an event. When a concentration sensor detects that the concentration of a harmful gas exceeds a threshold, the alarm sounds, indicating that the concentration of the harmful gas is excessive and requires action. For example, when the concentration sensor detects that the concentration of a harmful gas exceeds a threshold, the alarm sounds, indicating that battery device 100 needs after-sales service.

[0289] In some embodiments, the outer casing 21 is connected to the housing 10.

[0290] 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.

[0291] In other embodiments, the outer shell 21 is bonded to the housing 10.

[0292] 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.

[0293] This application embodiment also provides an electrical device, which includes the battery pack 20 described above.

[0294] Please refer to Figures 3 to 14 for some embodiments of this application.

[0295] This application provides a battery pack 20, which includes multiple electrode assemblies 22, a housing 21, and a pressure relief mechanism 29. The multiple electrode assemblies 22 are stacked sequentially. Each electrode assembly 22 includes a first electrode 221, a solid electrolyte layer 223, and a second electrode 222. The first electrode 221 and the second electrode 222 have opposite polarities. The solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222. The housing 21 has a sealed space within which the multiple electrode assemblies 22 are housed. The pressure relief mechanism 29 is disposed on the housing 21 and is configured to release any contaminants within the sealed space. The electrode assembly 22 of the battery pack 20 includes a solid electrolyte layer 223, which generates harmful gases during use. By providing a sealed space within the outer casing 21, multiple electrode assemblies 22 are housed within this sealed space, effectively sealing the generated harmful gases within the casing 21. This reduces the risk of harmful gas leakage and its potential harm to human health, thereby improving the reliability of the battery pack 20. Furthermore, by incorporating a pressure relief mechanism 29, when the pressure within the sealed space reaches a threshold, the mechanism releases the emissions, further reducing the risk of explosion or fire in the battery pack 20 and enhancing its overall reliability.

[0296] The outer casing 21 has a first wall portion 211, and a pressure relief mechanism 29 is separately disposed from the first wall portion 211. The first wall portion 211 is provided with a pressure relief hole 2111, and the pressure relief mechanism 29 is connected to the first wall portion 211 and covers the pressure relief hole 2111. By separately disposing of the pressure relief mechanism 29 from the first wall portion 211 and connecting it to the first wall portion 211, manufacturing is facilitated.

[0297] 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. This improves the efficiency, reliability, and lifespan of the battery pack 20.

[0298] 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 unnecessary 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.

[0299] This application embodiment also provides a battery device 100, which includes a housing 10 and a plurality of battery packs 20 as described above, the battery packs 20 being housed within the housing 10. The battery device 100 includes a second processing mechanism disposed within the housing 10 and located outside the outer casing 21. The second processing mechanism is used to reduce the concentration of at least one harmful gas in the emissions. By providing the second processing mechanism to reduce the concentration of at least one harmful gas in the emissions, the concentration of harmful gases within the housing 10 is lower, which helps reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery packs 20.

[0300] The second treatment mechanism includes a second adsorption element, which is disposed inside the housing 10 and located outside the outer casing 21. The second adsorption element is used to adsorb at least one harmful gas. By adsorbing at least one harmful gas through the second adsorption element, the concentration of at least one harmful gas in the emissions is reduced, which is less likely to affect other components inside the housing 10 and helps to improve the reliability of the battery device 100.

[0301] The second treatment mechanism includes a second medium supply mechanism, which provides a reaction medium to the housing 10 for reacting with harmful gases. The second medium supply mechanism can provide a reaction medium into the sealed space, which can chemically react with the harmful gases, thereby reducing the concentration of at least one harmful gas in the emissions. Through chemical reaction, the treatment of harmful gases is more thorough, which helps reduce the risk of harmful gases posing a threat to human health and improves the reliability of the battery pack 20.

[0302] The battery unit 100 includes a concentration sensor and an alarm. The concentration sensor is located inside the enclosure 10 and is used to detect the concentration of harmful gases emitted within the enclosure 10. The alarm responds to the concentration sensor. By using a concentration sensor to detect the concentration of harmful gases emitted within the enclosure 10, when the concentration sensor detects that the concentration of harmful gases exceeds a threshold, the alarm sounds, indicating that the concentration of harmful gases exceeds the standard and requires action.

[0303] 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 components are stacked sequentially. Each electrode component includes a first electrode, a solid electrolyte layer, and a second electrode. The first electrode and the second electrode have opposite polarities, and the solid electrolyte layer is disposed between the first electrode and the second electrode. The housing has a sealed space within which the plurality of electrode assemblies are housed; A pressure relief mechanism is disposed in the housing and is configured to release emissions within the sealed space.

2. The battery pack according to claim 1, wherein, The outer casing has a first wall portion, and the pressure relief mechanism is separately disposed with the first wall portion. The first wall portion is provided with a pressure relief hole, and the pressure relief mechanism is connected to the first wall portion and covers the pressure relief hole.

3. The battery pack according to claim 2, wherein, The battery pack also includes a protective component connected to the first wall portion and covering the pressure relief hole, the protective component being located on the side of the pressure relief mechanism away from the electrode assembly.

4. The battery pack according to claim 1, wherein, The outer casing has a first wall portion, and the pressure relief mechanism is integrally formed with the first wall portion.

5. The battery pack according to any one of claims 1-4, wherein, The pressure relief mechanism is provided with a first groove, and the pressure relief mechanism is configured to crack along at least a portion of the first groove when the pressure within the sealed space reaches a threshold.

6. The battery pack according to claim 5, wherein, The first groove is an annular groove.

7. The battery pack according to any one of claims 1-6, wherein, The battery pack includes a first processing mechanism disposed within the housing, the first processing mechanism being used to reduce the concentration of at least one harmful gas in the emissions.

8. The battery pack according to claim 7, wherein, The first processing mechanism includes a first adsorption element disposed inside the housing, and the first adsorption element is used to adsorb at least one of the harmful gases.

9. The battery pack according to claim 7, wherein, The first processing unit includes a first medium supply unit, which is used to supply the sealed space with a reaction medium for reacting with the harmful gas.

10. The battery pack according to any one of claims 1-9, wherein, The battery pack 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, which is used to acquire information from the electrode components.

11. The battery pack according to claim 10, wherein, The acquisition component includes a connector for electrical connection with external components; The housing includes a first wall and a second wall disposed opposite to each other. At least one of the first wall and the second wall is provided with the pressure relief mechanism. A portion of the circuit board is disposed between the second wall and the electrode assembly. The second wall is provided with a first lead-out hole. The connector extends out of the housing from the first lead-out hole and is sealed to the second wall.

12. The battery pack according to claim 11, wherein, The battery pack includes a first seal surrounding the first outlet hole, the first seal being used to seal the connector and the second wall portion.

13. The battery pack according to claim 10, 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 and a second wall disposed opposite to each other. At least one of the first wall and the second wall is provided with the pressure relief mechanism. A portion of the circuit board is disposed between the second wall and the electrode assembly. The second wall is provided with a second lead-out hole and a third lead-out hole. The first lead-out hole extends out of the housing from the second lead-out hole and is sealed to the second wall. The second lead-out hole extends out of the housing from the third lead-out hole and is sealed to the second wall.

14. The battery pack according to claim 13, wherein, The battery pack includes a second seal, which is disposed around the second lead hole and is used to seal the first lead portion and the second wall portion. and / or The battery pack includes a third seal that surrounds the third lead-out hole and is used to seal the second lead-out portion and the second wall portion.

15. The battery pack according to claim 13 or 14, 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.

16. The battery pack according to any one of claims 11-15, wherein, The battery pack includes a locking attachment configured to lock the circuit board and the second wall portion.

17. The battery pack according to any one of claims 1-16, wherein, The first electrode, the solid electrolyte layer, and the second electrode are stacked along a first direction; The housing includes a third wall portion and a fourth wall portion, which are disposed opposite to each other along the first direction, and the third wall portion and the fourth wall portion cooperate to press together a plurality of electrode assemblies.

18. The battery pack according to claim 17, wherein, The plurality of electrode assemblies are arranged along the first direction.

19. The battery pack according to claim 17 or 18, wherein, The outer casing includes a fifth wall portion and a sixth wall portion, which are disposed opposite to each other along a second direction. A fourth wall portion connects the fifth wall portion and the sixth wall portion. The fourth wall portion, the fifth wall portion, and the sixth wall portion are integrally formed to form a casing having a first opening in the first direction. A third wall portion closes the first opening. The second direction is perpendicular to the first direction.

20. The battery pack according to claim 19, 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 second wall portion, the first wall portion and the second 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.

21. The battery pack according to claim 17 or 18, wherein, The outer casing includes a fifth wall portion and a sixth wall portion, which are disposed opposite to each other along a second direction. The fifth wall portion connects the third wall portion and the fourth wall portion. The third wall portion, the fourth wall portion, and the fifth wall portion are integrally formed to form a casing having a fourth opening in the second direction. The sixth wall portion closes 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.

22. The battery pack according to claim 21, 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 second wall portion, the first wall portion and the second 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.

23. The battery pack according to claim 17 or 18, wherein, The outer shell includes a fifth wall portion and a sixth wall portion, which are disposed opposite to each other along a second direction. The third wall portion, the fifth wall portion, the fourth wall portion and the sixth wall portion are connected end to end in sequence. The third wall portion, the fifth wall portion, the fourth wall portion and the sixth 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 second wall portion, the first wall portion and the second wall portion respectively closing the second opening and the third opening, the first direction, the second direction and the third direction being perpendicular to each other.

24. The battery pack according to any one of claims 1-23, wherein, The electrode assembly is not encapsulated and is directly housed within the housing.

25. The battery pack according to claim 24, 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.

26. The battery pack according to claim 24 or 25, 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.

27. The battery pack according to any one of claims 1-23, 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.

28. The battery pack according to claim 27, 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.

29. The battery pack according to claim 26 or 28, wherein, The separator is made of heat-insulating material.

30. The battery pack according to any one of claims 1-29, wherein, The solid electrolyte layer comprises sulfides.

31. A battery device, wherein, include: Box; Multiple battery packs according to any one of claims 1-30, wherein the multiple battery packs are housed within the housing.

32. The battery device according to claim 31, wherein, The battery device includes a second processing mechanism disposed inside the housing and located outside the outer casing. The second processing mechanism is used to reduce the concentration of at least one harmful gas in the emissions.

33. The battery device according to claim 32, wherein, The second processing mechanism includes a second adsorption element disposed inside the box and located outside the outer shell, the second adsorption element being used to adsorb at least one of the harmful gases.

34. The battery device according to claim 32, wherein, The second processing unit includes a second medium supply unit, which is used to supply a reaction medium to the chamber for reacting with the harmful gas.

35. The battery device according to any one of claims 31-34, wherein, The battery device includes a concentration sensor and an alarm. The concentration sensor is disposed inside the housing and is used to detect the concentration of harmful gases emitted from the housing. The alarm is responsive to the concentration sensor.

36. The battery device according to any one of claims 31-35, wherein, The outer shell is connected to the housing.

37. An electrical appliance, wherein, The electrical device includes a battery pack according to any one of claims 1-30.

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