Battery pack, battery device and electric device

Abstract

The utility model provides a battery pack, a battery device and a power utilization device. The battery pack comprises a shell, a plurality of electrode assemblies, a circuit board and an output electrode base. The shell is provided with a first wall part, and the first wall part is provided with a first lead-out hole. A plurality of electrode assemblies are housed within the housing. One part of the circuit board is arranged between the first wall part and the electrode assemblies, the circuit board comprises a bus assembly, the bus assembly is electrically connected with the multiple electrode assemblies, the bus assembly comprises a leading-out part, and the leading-out part extends out of the shell through the first leading-out hole. The output pole base is arranged on the side, away from the interior of the shell, of the first wall part, the output pole base and the leading-out part are arranged in the first direction, and the output pole base is arranged on the first wall part in a floatable mode in the first direction and used for being connected with the leading-out part. The output pole base is arranged on the first wall part in the floatable manner, so that the lead-out part can be tightly attached to other electric connection parts, the mounting gap is reduced, the high-voltage ignition risk is reduced, and the reliability of the battery pack is improved.

Description

Technical Field

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

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

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

[0004] In a first aspect, embodiments of this application provide a battery pack, the battery pack including a housing, a plurality of electrode assemblies, a circuit board, and an output electrode base. The housing has a first wall portion, the first wall portion being provided with a first lead-out hole; the plurality of electrode assemblies are accommodated within the housing; a portion of the circuit board is disposed between the first wall portion and the electrode assemblies, the circuit board including a busbar assembly, the busbar assembly being electrically connected to the plurality of electrode assemblies, the busbar assembly including a lead-out portion, the lead-out portion extending out of the housing through the first lead-out hole; the output electrode base is disposed on the side of the first wall portion away from the interior of the housing, the output electrode base and the lead-out portion are arranged along a first direction, along the first direction, the output electrode base is buoyantly disposed on the first wall portion, the output electrode base being used to connect with the lead-out portion.

[0005] In the above technical solution, by making the output electrode base buoyantly disposed on the first wall, when the lead-out portion and other electrical connection components are locked to the output electrode base, the output electrode base can float along the first direction, actively adapting to the lead-out portion and other electrical connection components. This makes the lead-out portion and other electrical connection components less prone to deformation during connection, allowing them to fit tightly together, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack. Furthermore, the tight fit between the lead-out portion and other electrical connection components also helps to improve the current carrying capacity.

[0006] As an optional technical solution in this application embodiment, a slot is provided on one of the output electrode base and the first wall portion, and a protrusion is provided on the other of the output electrode base and the first wall portion, and the protrusion is movably disposed in the slot along the first direction.

[0007] In the above technical solution, by movably setting the protrusion in the slot along the first direction, the output electrode base is floatably set on the first wall along the first direction. On the one hand, the structure is simple and convenient, and easy to manufacture. On the other hand, the resistance when the output electrode base floats along the first direction is small, which makes it less likely for the lead-out portion and other electrical connection components to deform during connection. The lead-out portion and other electrical connection components can fit tightly, reducing the installation gap between the lead-out portion and other electrical connection components, reducing the risk of high-voltage arcing, and improving the reliability of the battery pack.

[0008] As an optional technical solution in this application embodiment, a first limiting member and a second limiting member are provided on the side of the first wall portion away from the interior of the outer shell. The first limiting member and the second limiting member are spaced apart along a second direction, and the first direction, the second direction and the thickness direction of the first wall portion are perpendicular to each other. A groove is formed between the first limiting member and the second limiting member to cooperate with the protrusion.

[0009] In the above technical solution, the first limiting member and the second limiting member together define the slot that cooperates with the protrusion. While having a good limiting effect on the output electrode base, it can also reduce material consumption and reduce the manufacturing cost of the battery pack.

[0010] As an optional technical solution in this application embodiment, the protrusion includes a first protrusion and a second protrusion. The second protrusion is disposed at one end of the first protrusion along the first direction. The first protrusion is movably disposed in the slot. Along the first direction, the second protrusion is located on the side of the first limiting member and / or the second limiting member facing the lead-out portion. The second protrusion is used to prevent the first protrusion from disengaging from the slot in a direction away from the lead-out portion.

[0011] In the above technical solution, by movably displacing the second protrusion within the slot along the first direction, the second protrusion engages with the slot, thereby preventing the output electrode base from disengaging from the slot in a direction perpendicular to the first direction. The second protrusion also prevents the first protrusion from disengaging from the slot in a direction away from the lead-out portion, thus restricting the output electrode base from disengaging from the slot in that direction. In this way, while facilitating the floating of the output electrode base along the first direction, the risk of the output electrode base detaching from the first wall portion is reduced.

[0012] As an optional technical solution in an embodiment of this application, the first limiting member includes a first limiting portion and a second limiting portion. The first limiting portion connects the first wall portion and the second limiting portion. The second limiting portion is disposed opposite to the first wall portion along the thickness direction of the first wall portion. The second limiting portion extends from the first limiting portion in a direction close to the second limiting member. A portion of the protrusion is located between the second limiting portion and the first wall portion. And / or the second limiting member includes a third limiting portion and a fourth limiting portion. The third limiting portion connects the first wall portion and the fourth limiting portion. The fourth limiting portion is disposed opposite to the first wall portion along the thickness direction of the first wall portion. The fourth limiting portion extends from the third limiting portion in a direction close to the first limiting member. A portion of the protrusion is located between the fourth limiting portion and the first wall portion.

[0013] In the above technical solution, by positioning a portion of the protrusion between the second limiting portion and the first wall portion, and a portion of the protrusion between the fourth limiting portion and the first wall portion, the risk of the output electrode base detaching from the first wall portion can be reduced while facilitating the floating of the output electrode base along the first direction.

[0014] As an optional technical solution in this application embodiment, the battery pack includes a floating nut, the floating nut includes a mounting base and a nut body, the mounting base is connected to the first wall portion, and the nut body is threadedly connected to the output electrode base.

[0015] In the above technical solution, the output electrode base is connected to the first wall by a floating nut, so that the output electrode base can be floated on the first wall along the first direction, which helps to improve the connection stability between the output electrode base and the first wall and makes it less likely for the output electrode base to detach from the first wall.

[0016] As an optional technical solution in this application embodiment, the output electrode base includes an insulator and a metal body, the metal body is at least partially embedded in the insulator, the insulator is connected to the first wall portion, and the metal body is used to connect with the lead-out portion.

[0017] In the above technical solution, by setting a metal body to connect with the lead-out portion, the connection strength between the lead-out portion, other electrical connection components, and the output electrode base is improved. By setting an insulator and having the metal body at least partially embedded in the insulator, the insulator can insulate and isolate the first wall portion from the metal body, thereby reducing the risk of short circuit between the output electrode base and the first wall portion and improving the reliability of the battery pack.

[0018] As an optional technical solution in this application embodiment, the metal body is provided with a connecting hole for cooperating with a connector, and the connector is used to connect the lead-out part and the metal body.

[0019] In the above technical solution, by providing connection holes on the metal body, it is convenient for the connector to lock the lead-out part and other electrical connection components to the output electrode base, thereby improving the connection strength and connection stability between the lead-out part, other electrical connection components and the output electrode base.

[0020] As an optional technical solution in this application embodiment, the battery pack includes a first insulating member, which is disposed between the lead-out portion and the hole wall surface of the first lead-out hole.

[0021] In the above technical solution, by setting the first insulating component, the risk of short circuit caused by contact between the lead-out part and the hole wall of the first lead-out hole is reduced, which helps to improve the reliability of the battery pack.

[0022] As an optional technical solution in this application embodiment, the electrode assembly is a solid electrode assembly, the housing has a sealed space, a plurality of the electrode assemblies are accommodated in the sealed space, and the lead-out portion is sealed to the first wall portion.

[0023] In the above technical solution, the solid-state electrode assembly includes a solid electrolyte layer. During use, it generates harmful gases. By creating a sealed space within the casing, multiple electrode assemblies are housed within this sealed space. In other words, the casing seals multiple electrode assemblies, thus containing the generated harmful gases within the casing. This reduces the risk of harmful gas leakage and its potential harm to human health, thereby improving the reliability of the battery pack. The lead-out portion is sealed to the first wall portion, thereby sealing both the lead-out portion and the first wall portion, further reducing the risk of harmful gas leakage and improving the reliability of the battery pack.

[0024] As an optional technical solution in this application embodiment, the battery pack includes a first sealing member, which is disposed around the first lead-out hole, and is used to seal the lead-out portion and the first wall portion.

[0025] In the above technical solution, the first sealing member is arranged around the first lead hole. Since the lead hole extends out of the outer shell from the first lead hole, the first sealing member is also arranged around the lead hole. The first sealing member can abut against the circuit board and the first wall, thereby sealing the lead hole and the first wall, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0026] As an optional technical solution in this application embodiment, 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.

[0027] 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.

[0028] As an optional technical solution in this application embodiment, the acquisition component includes a connector for electrical connection with an external component; the first wall is provided with a second lead-out hole, and the connector extends out of the housing from the second lead-out hole and is sealed to the first wall.

[0029] In the above technical solution, the connector extends from the housing through the second 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 first 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.

[0030] As an optional technical solution in this application embodiment, the battery pack includes a second seal, which is disposed around the second lead hole and is used to seal the connector and the first wall portion.

[0031] In the above technical solution, the second seal is arranged around the second lead hole. Since the connector extends out of the housing from the second lead hole, the second seal is also arranged around the connector. The second seal can abut between the circuit board and the first wall, thereby sealing the connector and the first wall, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack.

[0032] As an optional technical solution in this application embodiment, the battery pack includes a locking accessory, which is configured to lock the circuit board and the first wall portion, and the locking accessory is sealed to the first wall portion.

[0033] In the above technical solution, by providing a locking accessory, the circuit board is locked to the first wall, thereby positioning the circuit board and reducing the risk of it shaking during battery pack use. This helps maintain a stable connection between the circuit board and electrode components or other electrical connection parts. Sealing the locking accessory to the first wall also reduces the risk of harmful gas leakage, thus improving the reliability of the battery pack.

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

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

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

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

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

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

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

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

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

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

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

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

[0046] As an optional technical solution in this application embodiment, the solid electrode assembly includes a solid electrolyte layer, and the solid electrolyte layer includes sulfides.

[0047] 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.

[0048] As an optional technical solution in this application embodiment, the electrode assembly includes a solid electrolyte layer and a plurality of electrodes. Along the second direction, the solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In the two adjacent electrodes, the active material layer facing the solid electrolyte layer located between the two adjacent electrodes has opposite polarities. The outer shell includes a second wall portion and a third wall portion. Along the second direction, the second wall portion and the third wall portion are disposed opposite to each other, and the second wall portion and the third wall portion cooperate to press the plurality of electrode assemblies.

[0049] In the above technical solution, the second wall portion and the third wall portion cooperate to compress the electrode assembly along the first direction, thereby pressing the electrode sheet and the solid electrolyte layer together, so that the electrode sheet and the solid electrolyte layer can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack.

[0050] As an optional technical solution in this application embodiment, the plurality of electrode components are arranged along the second direction.

[0051] In the above technical solution, by arranging multiple electrode components along the second direction, that is, arranging multiple electrode components in the same direction as arranging multiple electrode sheets and solid electrolyte layers, the second wall portion and the third wall portion can cooperate to compress multiple electrode components along the second direction, thereby pressing the electrode sheets and solid electrolyte layers of multiple electrode components together, which facilitates ion transport and reduces the internal resistance of the battery pack.

[0052] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a first direction, the third wall portion connects the fourth wall portion and the fifth wall portion, the third wall portion, the fourth wall portion and the fifth wall portion are integrally formed to form a shell having a first opening in a second direction, the second wall portion closes the first opening, and the second direction is perpendicular to the first direction.

[0053] In the above technical solution, the third, fourth, and fifth walls are integrally formed to create the housing, while the second wall is separately disposed and connected to the housing. During assembly, multiple electrode assemblies can be first housed within the housing, then the second wall presses the multiple electrode assemblies against the third wall along a second direction, and finally the second wall is connected to the housing. This allows the second and third walls to easily cooperate and press together to compress multiple electrode assemblies during assembly.

[0054] As an optional technical solution in this application embodiment, along a third direction, the housing has a second opening and a third opening that are disposed opposite to each other, and the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; the size of the outer shell along the first direction and the size of the outer shell along the second direction are both smaller than the size of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0055] 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.

[0056] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a first direction, the fourth wall portion connects the second wall portion and the third wall portion, the second wall portion, the third wall portion and the fourth wall portion are integrally formed to form a shell having a fourth opening in the first direction, and the fifth wall portion closes the fourth opening; the dimension of the outer shell along the first direction is smaller than the dimension of the outer shell along the second direction, and the second direction is perpendicular to the first direction.

[0057] In the above technical solution, the second wall, the third wall and the fourth wall are integrally formed to form the shell, and the fifth wall is separately set and connected to the shell. During assembly, multiple electrode assemblies can be inserted into the shell through the fourth opening first, and then the fifth wall is connected to the shell. Since the size of the shell along the first direction is smaller than the size of the shell along the second direction, the distance that multiple electrode assemblies need to move to be inserted into the shell through the fourth opening is relatively short, and the assembly is simpler and more convenient.

[0058] As an optional technical solution in this application embodiment, along a third direction, the housing has a second opening and a third opening that are disposed opposite to each other, and the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; the size of the outer shell along the second 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.

[0059] In the above technical solution, the size of the outer shell along the first direction is smaller than the size of the outer shell along the second direction, and the size of the outer shell along the second direction is smaller than the size of the outer shell along the third direction. Therefore, the size of the outer shell along the first direction is the smallest. During assembly, multiple electrode components can be inserted into the shell from the fourth opening. Since the size of the outer shell along the first direction is the smallest, the distance that multiple electrode components need to move to be inserted into the shell from the fourth opening is the shortest, making assembly simpler and more convenient.

[0060] As an optional technical solution in this application embodiment, the outer shell includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a first direction, the second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are connected end to end in sequence, the second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are integrally formed to form a shell having a second opening and a third opening in a third direction; the outer shell also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively close the second opening and the third opening, the first direction, the second direction and the third direction are perpendicular to each other.

[0061] In the above technical solution, the second wall, the fourth wall, the third wall and the fifth wall are integrally formed to form a shell. During assembly, multiple electrode components can be inserted into the shell through the second opening or the third opening. Then, the second opening is closed by the first wall and the third opening is closed by the sixth wall. The assembly steps are fewer and the assembly efficiency is higher.

[0062] As an optional technical solution in this application embodiment, the electrode assembly includes a solid electrolyte layer and a plurality of electrodes. The solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layer facing the solid electrolyte layer located between the two adjacent electrodes has opposite polarities.

[0063] In the above technical solution, the electrode assembly includes a solid electrolyte layer, thus the electrode assembly is a solid-state electrode assembly. When the electrode assembly is a solid-state electrode assembly, the energy density of the battery pack is higher.

[0064] As an optional technical solution in this application embodiment, the plurality of electrode sheets include a first electrode sheet and a second electrode sheet, the first electrode sheet and the second electrode sheet having opposite polarities, the first electrode sheet, the solid electrolyte layer and the second electrode sheet being stacked, and the solid electrolyte layer being disposed between the first electrode sheet and the second electrode sheet.

[0065] In the above technical solution, the electrode assembly includes a first electrode, a solid electrolyte layer and a second electrode stacked together. In this way, the electrode assembly is simple and convenient to manufacture and has a low cost.

[0066] As an optional technical solution in this application embodiment, the electrode includes a current collector, a first active material layer and a second active material layer, wherein the first active material layer and the second active material layer have opposite polarities, and the first active material layer and the second active material layer are respectively disposed on both sides of the current collector.

[0067] In the above technical solution, by making the electrode sheet include a current collector, a first active material layer and a second active material layer, with the first active material layer and the second active material layer having opposite polarities, it is beneficial to make the battery pack have a higher energy density.

[0068] 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.

[0069] As an optional technical solution in this application embodiment, the battery device includes a current-combining component, which is electrically connected to a plurality of battery packs; the current-combining component and the lead-out portion are connected to the output electrode base.

[0070] In the above technical solution, by making the output electrode base buoyantly mounted on the first wall, when the lead-out portion and the busbar component are attached to the output electrode base, the output electrode base can float along the first direction, actively adapting to the lead-out portion and the busbar component. This makes the lead-out portion and the busbar component less prone to deformation during connection, allowing them to fit tightly together, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack. Furthermore, the tight fit between the lead-out portion and the busbar component also helps to improve the current carrying capacity.

[0071] As an optional technical solution in this application embodiment, the outer shell is connected to the box body.

[0072] 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.

[0073] Thirdly, embodiments of this application also provide an electrical device, which includes the aforementioned battery pack. Attached Figure Description

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

[0075] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0076] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0077] Figure 3 This is a schematic diagram of the battery pack structure provided in some embodiments of this application;

[0078] Figure 4 Exploded views of the battery pack provided in some embodiments of this application;

[0079] Figure 5 Exploded views of the circuit board and the first wall portion provided in some embodiments of this application;

[0080] Figure 6 This is a schematic diagram of the structure of the output electrode base provided in some embodiments of this application;

[0081] Figure 7 Cross-sectional views of a battery pack provided for some embodiments of this application;

[0082] Figure 8 Cross-sectional views of the battery pack provided in other embodiments of this application;

[0083] Figure 9 Cross-sectional views of electrode assemblies provided in some embodiments of this application;

[0084] Figure 10 Exploded views of the second wall and housing provided for some embodiments of this application;

[0085] Figure 11 Exploded views of the battery pack provided in other embodiments of this application;

[0086] Figure 12 Exploded views of the fifth wall and the housing provided for other embodiments of this application;

[0087] Figure 13Exploded views of the battery pack provided in some embodiments of this application;

[0088] Figure 14 Cross-sectional view of an electrode assembly provided for other embodiments of this application.

[0089] Icons: 10-Box; 11-First part; 12-Second part; 20-Battery pack; 21-Outer casing; 211-First wall; 2111-Second lead-out hole; 2112-First lead-out hole; 2114-First mounting hole; 2115-Second mounting hole; 212-Second wall; 213-Housing casing; 2131-Third wall; 2132-Fourth wall; 2133-Fifth wall; 2134-First 2135 - Second opening; 2136 - Third opening; 2137 - Fourth opening; 214 - Sixth wall portion; 217 - First limiting member; 2171 - First limiting part; 2172 - Second limiting part; 218 - Second limiting member; 2181 - Third limiting part; 2182 - Fourth limiting part; 219 - Slot; 22 - Electrode assembly; 221 - Electrode sheet; 2211 - First electrode sheet; 2212 - ... 2213 - Current collector; 2214 - First active material layer; 2215 - Second active material layer; 222 - Solid electrolyte layer; 23 - Circuit board; 231 - Data acquisition component; 2311 - Connector; 2312 - Second seal; 232 - Busbar assembly; 2321 - Lead-out portion; 2322 - Busbar; 2325 - First seal; 2327 - First insulator; 24 - Mounting structure; 25 - Lock accessory; 251 - First lock accessory; 252 - Second lock accessory; 26 - Second insulator; 27 - Separator; 28 - Encapsulation bag; 29 - Output electrode base; 291 - Insulator; 2911 - Protrusion; 29111 - First protrusion; 29112 - Second protrusion; 292 - Metal body; 2921 - Connection hole; 100 - Battery device; 200 - Controller; 300 - Motor; 1000 - Vehicle. Detailed Implementation

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In this application, "multiple" means two or more (including two).

[0097] The battery pack comprises multiple battery cells, which can be connected in series, parallel, or a combination of both. In this embodiment, the battery cell can be a rechargeable battery, which is a battery cell that can be reactivated by charging after discharge to continue its use.

[0098] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0099] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0100] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0101] 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.

[0102] 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.

[0103] 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.).

[0104] 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 in battery cells 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 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0105] 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.

[0106] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0107] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0108] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0109] 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.

[0110] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0111] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0112] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0113] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0114] In some embodiments, the separator is a solid electrolyte layer. The solid electrolyte layer is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0115] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0116] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0117] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0118] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0119] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0120] 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.

[0121] 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.

[0122] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0123] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0124] In some implementations, the electrode assembly is a stacked structure.

[0125] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0126] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0127] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0128] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0129] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0130] In some implementations, the electrode assembly may be flat or polygonal in shape.

[0131] 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.

[0132] In some implementations, the battery pack may include a housing. The housing is used to encapsulate multiple battery cells. The housing may be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), etc.

[0133] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it can protect the individual battery cells and, to some extent, prevent the leakage of harmful gases. When the housing is a non-sealed structure, it can still protect the individual battery cells, and a packaging bag may be included between the housing and the electrode assembly. This packaging bag is used to encapsulate the electrode assembly and electrolyte, etc. Specifically, the packaging bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0134] 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.

[0135] In some embodiments, the battery device may be a battery pack, which may include a housing and multiple battery packs housed within the housing.

[0136] As an example, the battery pack can be housed in a casing in a way that is fixed within the casing.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] In existing technology, the output electrode base is fixed to the outer casing. When the leads and other electrical connection components are attached to the output electrode base, the fixed position of the base forces the leads and other components to move towards it. This can easily cause deformation of the leads and other components, resulting in a lack of tight fit and a large installation gap. This can easily lead to high-voltage arcing. Therefore, the reliability of the battery needs further improvement.

[0144] In view of this, this application provides a battery pack, which includes a housing, multiple electrode assemblies, a circuit board, and an output electrode base. The housing has a first wall portion with a first lead-out hole, and the multiple electrode assemblies are housed within the housing. A portion of the circuit board is disposed between the first wall portion and the electrode assemblies. The circuit board includes a busbar assembly electrically connected to the multiple electrode assemblies, and the busbar assembly includes a lead-out portion that extends out of the housing through the first lead-out hole. The output electrode base is disposed on the side of the first wall portion facing away from the interior of the housing, and the output electrode base and the lead-out portion are arranged along a first direction. Along the first direction, the output electrode base is buoyantly disposed on the first wall portion and is used to connect to the lead-out portion.

[0145] By allowing the output electrode base to float on the first wall, when the leads and other electrical connection components are attached to the output electrode base, the base can float along a first direction, actively adapting to the leads and other electrical connection components. This prevents deformation of the leads and other electrical connection components during connection, ensuring a tight fit and reducing installation gaps. This lowers the risk of high-voltage arcing and improves the reliability of the battery pack. Furthermore, the tight fit also enhances current carrying capacity.

[0146] 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.

[0147] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0148] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure 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.

[0149] 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.

[0150] 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.

[0151] Please refer to Figure 2 , Figure 2 This 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, the housing 10 being used to house the plurality of battery packs 20.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] Please refer to Figure 3 , Figure 4 and Figure 5 , Figure 3 This is a schematic diagram of the structure of a battery pack 20 provided in some embodiments of this application. Figure 4 An exploded view of a battery pack 20 provided for some embodiments of this application. Figure 5This is an exploded view of the circuit board 23 and the first wall portion 211 provided in some embodiments of this application. Embodiments of this application provide a battery pack 20, which includes a housing 21, a plurality of electrode assemblies 22, a circuit board 23, and an output electrode base 29. The housing 21 has a first wall portion 211 with a first lead-out hole 2112, and the plurality of electrode assemblies 22 are housed within the housing 21. A portion of the circuit board 23 is disposed between the first wall portion 211 and the electrode assemblies 22. The circuit board 23 includes a busbar assembly 232 electrically connected to the plurality of electrode assemblies 22, and the busbar assembly 232 includes a lead-out portion 2321 extending out of the housing 21 through the first lead-out hole 2112. The output electrode base 29 is disposed on the side of the first wall portion 211 facing away from the interior of the housing 21, and the output electrode base 29 and the lead-out portion 2321 are arranged along a first direction. Along the first direction, the output electrode base 29 is floatingly disposed on the first wall portion 211, and the output electrode base 29 is used to connect with the lead-out portion 2321.

[0156] The outer casing 21 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 21 is a sealed structure, multiple electrode components 22 can be directly housed within the outer casing 21 without encapsulation. The outer casing 21 can protect the electrode components 22 and, to some extent, prevent the leakage of harmful gases. When the outer casing 21 is a non-sealed structure, a sealing bag 28 can be included between the outer casing 21 and the electrode components 22. The sealing bag 28 is used to encapsulate the electrode components 22 and electrolytes, etc. Specifically, the sealing bag 28 can be a bag-shaped insulating component or an aluminum-plastic film. The outer casing 21 can be made of a material with a certain hardness and strength (such as metal), so that the outer casing 21 is not easily deformed under pressure 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, and plastic.

[0157] 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.

[0158] Electrode assembly 22 is a component in battery pack 20 where electrochemical reactions occur. Multiple electrode assemblies 22 may be contained within the housing 21. Each electrode assembly 22 includes multiple electrodes 221 and a separator, with the separator disposed between adjacent electrodes 221. Each electrode 221 includes an active material layer, and in adjacent electrodes 221, the active material layers facing the separator located between the adjacent electrodes 221 have opposite polarities.

[0159] In some embodiments, the plurality of electrodes 221 include positive and negative electrodes, and the positive electrode, separator, and negative electrode are wound or stacked to form an electrode assembly 22. The portions of the positive and negative electrodes having active material constitute the main body of the electrode assembly 22, and the portions of the positive and negative electrodes not having active material each constitute an electrode tab. The positive and negative electrode tabs may be located together at one end of the main body or at opposite ends of the main body.

[0160] In other embodiments, the electrode 221 includes a current collector 2213, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector 2213. The separator and multiple electrode sheets 221 are wound or stacked to form an electrode assembly 22.

[0161] The first wall portion 211 can be any wall portion of the outer shell 21. The first wall portion 211 is provided with a first outlet hole 2112, which is a through hole that penetrates the first wall portion 211 along the thickness direction of the first wall portion 211.

[0162] 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.

[0163] The electrical connection structure may include a busbar assembly 232, which is electrically connected to multiple electrode assemblies 22 and serves to combine current from the multiple electrode assemblies 22. The busbar assembly 232 may include two leads 2321 and two busbars 2322, with the two leads 2321 having opposite polarities. One busbar 2322 is electrically connected to one lead 2321 and a first tab of the multiple electrode assemblies 22, while the other busbar 2322 is electrically connected to the other lead 2321 and a second tab of the multiple electrode assemblies 22. One of the first and second tabs is the positive tab, and the other is the negative tab. The two leads 2321 serve as the positive and negative output terminals of the battery pack 20, respectively.

[0164] The main body of the circuit board 23 is disposed between the first wall portion 211 and the electrode assembly 22. A lead-out portion 2321 extends out of the housing 21 from the first lead-out hole 2112 to facilitate electrical connection with external components. The position of the lead-out portion 2321 can be used to determine which wall portion of the housing 21 is the first wall portion 211. It should be noted that both lead-out portions 2321 can be disposed on the same wall portion of the housing 21, or they can be disposed on separate walls of the housing 21.

[0165] The first direction refers to the arrangement direction of the output electrode base 29 and the lead-out portion 2321. Please refer to [reference needed]. Figure 4 and Figure 5 The first direction is the Y direction shown in the figure.

[0166] The output electrode base 29 is a structure used to connect the lead-out portion 2321 to other electrical connection components. The output electrode base 29 is disposed on the side of the first wall portion 211 away from the interior of the outer casing 21, that is, the output electrode base 29 is disposed on the outer side of the first wall portion 211. The output electrode base 29 is buoyantly disposed on the first wall portion 211 along a first direction. When the lead-out portion 2321 and other electrical connection components are locked to the output electrode base 29, the output electrode base 29 can float along the first direction, thereby reducing the installation gap between the lead-out portion 2321 and other electrical connection components.

[0167] By allowing the output electrode base 29 to float on the first wall portion 211, when the lead-out portion 2321 and other electrical connection components are attached to the output electrode base 29, the output electrode base 29 can float along the first direction, actively adapting to the lead-out portion 2321 and other electrical connection components. This prevents the lead-out portion 2321 and other electrical connection components from deforming during connection, allowing them to fit tightly together, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack 20. Furthermore, the tight fit between the lead-out portion 2321 and other electrical connection components also helps improve current carrying capacity.

[0168] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 6 This is a schematic diagram of the structure of the output electrode base 29 provided in some embodiments of this application. In some embodiments, a slot 219 is provided on one of the output electrode base 29 and the first wall portion 211, and a protrusion 2911 is provided on the other of the output electrode base 29 and the first wall portion 211. The protrusion 2911 is movably disposed in the slot 219 along a first direction.

[0169] The phrase "one of the output electrode base 29 and the first wall portion 211 is provided with a slot 219, and the other of the output electrode base 29 and the first wall portion 211 is provided with a protrusion 2911" can be interpreted as follows: the output electrode base 29 is provided with a protrusion 2911, the first wall portion 211 is provided with a slot 219, and the protrusion 2911 is movably disposed within the slot 219 along a first direction, so that the output electrode base 29 can be floatably disposed on the first wall portion 211 along the first direction; or the first wall portion 211 is provided with a protrusion 2911, the output electrode base 29 is provided with a slot 219, and the protrusion 2911 is movably disposed within the slot 219 along the first direction, so that the output electrode base 29 can be floatably disposed on the first wall portion 211 along the first direction.

[0170] By movably positioning the protrusion 2911 within the slot 219 along the first direction, the output electrode base 29 is floatably positioned on the first wall portion 211 along the first direction. This design offers several advantages: firstly, it is simple, convenient, and easy to manufacture; secondly, the low resistance during the floating of the output electrode base 29 along the first direction reduces deformation of the lead-out portion 2321 and other electrical connection components during connection, allowing for a tight fit between the lead-out portion 2321 and other electrical connection components, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack 20.

[0171] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, a first limiting member 217 and a second limiting member 218 are provided on the side of the first wall portion 211 facing away from the interior of the outer casing 21. The first limiting member 217 and the second limiting member 218 are spaced apart along a second direction, and the first direction, the second direction, and the thickness direction of the first wall portion 211 are perpendicular to each other. A groove 219 is formed between the first limiting member 217 and the second limiting member 218 to engage with the protrusion 2911.

[0172] Please refer to Figure 4 and Figure 5 The second direction can be the X direction shown in the figure, and the thickness direction of the first wall portion 211 can be the Z direction shown in the figure. The first direction, the second direction and the thickness direction of the first wall portion 211 are perpendicular to each other.

[0173] A first limiting member 217 and a second limiting member 218 are provided on the side of the first wall portion 211 away from the interior of the outer casing 21. The first limiting member 217 and the second limiting member 218 are spaced apart along the second direction. The first limiting member 217 and the second limiting member 218 together define a slot 219 that mates with the protrusion 2911.

[0174] The first limiting member 217 and the second limiting member 218 together define the slot 219 that cooperates with the protrusion 2911. While providing a good limiting effect on the output terminal base 29, it can also reduce material consumption and lower the manufacturing cost of the battery pack 20.

[0175] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6In some embodiments, the protrusion 2911 includes a first protrusion 29111 and a second protrusion 29112. The second protrusion 29112 is disposed at one end of the first protrusion 29111 along a first direction. The first protrusion 29111 is movably disposed within the slot 219. Along the first direction, the second protrusion 29112 is located on the side of the first limiting member 217 and / or the second limiting member 218 facing the lead-out portion 2321. The second protrusion 29112 is used to prevent the first protrusion 29111 from disengaging from the slot 219 in a direction away from the lead-out portion 2321.

[0176] The first protrusion 29111 is the portion of the protrusion 2911 that is movably disposed within the slot 219 along a first direction, and the second protrusion 29112 is disposed on the side of the first protrusion 29111 facing the lead-out portion 2321 along the first direction. In other words, the first protrusion 29111 protrudes from the second protrusion 29112 in a direction away from the lead-out portion 2321. The second protrusion 29112 can abut against the end of at least one of the first limiting member 217 and the second limiting member 218 facing the lead-out portion 2321, thereby preventing the first protrusion 29111 from disengaging from the slot 219 in a direction away from the lead-out portion 2321, that is, preventing the output electrode base 29 from disengaging from the slot 219 in a direction away from the lead-out portion 2321.

[0177] By movably displacing the second protrusion 29112 within the slot 219 along the first direction, the second protrusion 29112 engages with the slot 219, thereby preventing the output electrode base 29 from disengaging from the slot 219 in a direction perpendicular to the first direction. The second protrusion 29112 also prevents the first protrusion 29111 from disengaging from the slot 219 in a direction away from the lead-out portion 2321, thus restricting the output electrode base 29 from disengaging from the slot 219 in the same direction. This facilitates the floating of the output electrode base 29 along the first direction while reducing the risk of the output electrode base 29 disengaging from the first wall portion 211.

[0178] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6In some embodiments, the first limiting member 217 includes a first limiting portion 2171 and a second limiting portion 2172. The first limiting portion 2171 connects the first wall portion 211 and the second limiting portion 2172. The second limiting portion 2172 is disposed opposite to the first wall portion 211 along the thickness direction of the first wall portion 211. The second limiting portion 2172 extends from the first limiting portion 2171 in a direction close to the second limiting member 218. A portion of the protrusion 2911 is located between the second limiting portion 2172 and the first wall portion 211. And / or the second limiting member 218 includes a third limiting part 2181 and a fourth limiting part 2182. The third limiting part 2181 connects the first wall part 211 and the fourth limiting part 2182. The fourth limiting part 2182 is disposed opposite to the first wall part 211 along the thickness direction of the first wall part 211. The fourth limiting part 2182 extends from the third limiting part 2181 in a direction close to the first limiting member 217. A portion of the protrusion 2911 is located between the fourth limiting part 2182 and the first wall part 211.

[0179] The first limiting portion 2171 is the part of the first limiting member 217 used to connect the second limiting portion 2172 and the first wall portion 211. The first limiting portion 2171 can extend along the thickness direction of the first wall portion 211. The second limiting portion 2172 is the part of the first limiting member 217 disposed opposite to the first wall portion 211 along the thickness direction of the first wall portion 211. The second limiting portion 2172 can extend from the end of the first limiting portion 2171 away from the first wall portion 211 towards the second limiting member 218. The first limiting portion 2171 and the second limiting portion 2172 together form an L-shaped structure.

[0180] The third limiting portion 2181 is the part of the second limiting member 218 used to connect the fourth limiting portion 2182 and the first wall portion 211. The third limiting portion 2181 can extend along the thickness direction of the first wall portion 211. The fourth limiting portion 2182 is the part of the second limiting member 218 disposed opposite to the first wall portion 211 along the thickness direction of the first wall portion 211. The fourth limiting portion 2182 can extend from the end of the third limiting portion 2181 away from the first wall portion 211 towards the first limiting member 217. The third limiting portion 2181 and the fourth limiting portion 2182 together form an L-shaped structure.

[0181] Along the thickness direction of the first wall portion 211, a portion of the protrusion 2911 is located between the second limiting portion 2172 and the first wall portion 211, and a portion of the protrusion 2911 is located between the fourth limiting portion 2182 and the first wall portion 211. Along the second direction, a portion of the protrusion 2911 is located between the first limiting portion 2171 and the third limiting portion 2181.

[0182] By positioning a portion of the protrusion 2911 between the second limiting portion 2172 and the first wall portion 211, and a portion of the protrusion 2911 between the fourth limiting portion 2182 and the first wall portion 211, the risk of the output electrode base 29 detaching from the first wall portion 211 can be reduced while facilitating the floating of the output electrode base 29 along the first direction.

[0183] In other embodiments, the battery pack 20 includes a floating nut, which includes a mounting base and a nut body. The mounting base is connected to the first wall portion 211, and the nut body is threadedly connected to the output electrode base 29.

[0184] The mounting base serves as the base for the floating nut and is connected to the first wall portion 211. The nut body is buoyantly disposed on the mounting base along a first direction to form a floating nut. The nut body has a threaded hole and is connected to the output electrode base 29 via a threaded connector.

[0185] The output electrode base 29 is connected to the first wall portion 211 by a floating nut, so that the output electrode base 29 can be floated on the first wall portion 211 along the first direction, which helps to improve the connection stability between the output electrode base 29 and the first wall portion 211, making it less likely for the output electrode base 29 to detach from the first wall portion 211.

[0186] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the output electrode base 29 includes an insulator 291 and a metal body 292, the metal body 292 being at least partially embedded in the insulator 291, the insulator 291 being connected to the first wall portion 211, and the metal body 292 being used to connect to the lead-out portion 2321.

[0187] The insulator 291 is an insulating material and has insulating properties. The material of the insulator 291 can be plastic, rubber, etc. The insulator 291 is floatingly disposed on the first wall portion 211 along the first direction.

[0188] The metal body 292 is made of metal and has high structural strength. The material of the metal body 292 can be copper, iron, aluminum, steel, etc. The metal body 292 is used to connect with the lead-out part 2321, that is, the lead-out part 2321 and other electrical connection parts are locked to the metal body 292.

[0189] The metal body 292 is partially or entirely embedded within the insulator 291. Optionally, the metal body 292 and the insulator 291 are integrally injection molded.

[0190] By connecting the metal body 292 to the lead-out portion 2321, the connection strength between the lead-out portion 2321, other electrical connection components, and the output electrode base 29 is improved. By providing an insulator 291 and having the metal body 292 at least partially embedded within it, the insulator 291 can insulate and isolate the first wall portion 211 and the metal body 292, thereby reducing the risk of a short circuit between the output electrode base 29 and the first wall portion 211 and improving the reliability of the battery pack 20.

[0191] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the metal body is provided with a connection hole 2921 for cooperating with a connector, which is used to connect the lead-out portion 2321 and the metal body.

[0192] The connecting hole 2921 can be a threaded hole, and the connector can be a threaded connector. The threaded connector is threadedly engaged with the threaded hole to lock the lead-out part 2321 to the metal body.

[0193] The connecting hole 2921 can also be a through hole, and the connecting part can be a bolt. The lead-out part 2321 is bolted to the metal body.

[0194] By providing connection holes 2921 on the metal body, it is easy for the connector to lock the lead-out part 2321 and other electrical connection components to the output electrode base 29, thereby improving the connection strength and connection stability between the lead-out part 2321, other electrical connection components and the output electrode base 29.

[0195] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the battery pack 20 includes a first insulating member 2327 disposed between the lead-out portion 2321 and the hole wall of the first lead-out hole 2112.

[0196] The first insulating member 2327 has insulating properties and is disposed between the lead-out portion 2321 and the hole wall surface of the first lead-out hole 2112 to insulate and isolate the lead-out portion 2321 and the first wall portion 211, thereby reducing the risk of short circuit due to contact between the lead-out portion 2321 and the first wall portion 211. The material of the first insulating member 2327 can be plastic, rubber, etc.

[0197] Optionally, the first insulating element 2327 and the lead-out portion 2321 are integrally injection molded.

[0198] By setting the first insulating element 2327, the risk of short circuit caused by contact between the lead-out portion 2321 and the hole wall of the first lead-out hole 2112 is reduced, which helps to improve the reliability of the battery pack 20.

[0199] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the electrode assembly 22 is a solid-state electrode assembly. The housing 21 has a sealed space in which multiple electrode assemblies 22 are housed, and the lead-out portion 2321 is sealed to the first wall portion 211.

[0200] When the electrode assembly 22 is a solid electrode assembly, the separator is a solid electrolyte layer 222. The electrode assembly 22 includes a plurality of electrodes 221 and a solid electrolyte layer 222. The solid electrolyte layer 222 is disposed between two adjacent electrodes 221. The electrodes 221 include an active material layer. In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite.

[0201] The outer casing 21 of the battery pack 20 forms a sealed space, which seals multiple electrode components 22. In this way, the generated harmful gases can be sealed inside the casing 21, reducing the risk of harmful gas leakage and the risk of harmful gases harming human health, and helping to improve the reliability of the battery pack 20.

[0202] The main body of the circuit board 23 is disposed between the first wall portion 211 and the electrode assembly 22. The lead-out portion 2321 extends out of the outer casing 21 from the first lead-out hole 2112. The lead-out portion 2321 and the first wall portion 211 form a sealed connection to prevent harmful gases inside the outer casing 21 from leaking out.

[0203] The solid-state electrode assembly includes a solid electrolyte layer 222, which generates harmful gases during use. By providing a sealed space within the housing 21, multiple electrode assemblies 22 are housed within this sealed space. In other words, the housing 21 seals multiple electrode assemblies 22, thus containing the generated harmful gases within the housing 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. The lead-out portion 2321 is sealed to the first wall portion 211, thereby sealing both the lead-out portion 2321 and the first wall portion 211, further reducing the risk of harmful gas leakage and improving the reliability of the battery pack 20.

[0204] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the battery pack 20 includes a first seal 2325 disposed around the first lead hole 2112, the first seal 2325 being used to seal the lead 2321 and the first wall portion 211.

[0205] The first seal 2325 has sealing properties and is used to seal the lead-out portion 2321 and the first wall portion 211.

[0206] "The first seal 2325 is arranged around the first outlet hole 2112" means that in the projection plane perpendicular to the thickness direction of the first wall portion 211, the projection of the first seal 2325 is arranged around the outside of the projection of the hole wall surface of the first outlet hole 2112.

[0207] Since the lead-out portion 2321 extends out of the outer casing 21 from the first lead-out hole 2112, the first seal 2325 is also provided around the lead-out portion 2321. The first seal 2325 can abut against the circuit board 23 and the first wall portion 211. In this way, the first seal 2325 can prevent harmful gases from entering the first lead-out hole 2112, so as to achieve a seal between the lead-out portion 2321 and the first wall portion 211.

[0208] The first sealing element 2325 can be a sealant, gasket, or sealing ring.

[0209] To facilitate the positioning of the first seal 2325, a first receiving groove can be provided on the circuit board 23 to accommodate the first seal 2325.

[0210] The first sealing element 2325 is arranged around the first lead-out hole 2112. Since the lead-out portion 2321 extends out of the outer casing 21 from the first lead-out hole 2112, the first sealing element 2325 is also arranged around the lead-out portion 2321. The first sealing element 2325 can abut against the circuit board 23 and the first wall portion 211, thereby sealing the lead-out portion 2321 and the first wall portion 211, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0211] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, 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.

[0212] The electrical connection structure on circuit board 23 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.

[0213] The acquisition component 231 can be electrically connected to the busbar 2322 to acquire information from multiple electrode components 22.

[0214] 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.

[0215] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the acquisition component 231 includes a connector 2311 for electrical connection with an external component. The housing 21 includes a first wall 211, a portion of the circuit board 23 is disposed between the first wall 211 and the electrode assembly 22, the first wall 211 is provided with a second lead-out hole 2111, and the connector 2311 extends out of the housing 21 from the second lead-out hole 2111 and is sealed to the first wall 211.

[0216] 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.

[0217] A second lead-out hole 2111 is provided on the first wall portion 211. The second lead-out hole 2111 is a through hole that penetrates the first wall portion 211 along the thickness direction of the first wall portion 211. The connector 2311 can extend out of the housing 21 from the second lead-out hole 2111 to facilitate electrical connection with external components.

[0218] Connector 2311 extends out of housing 21 from second lead-out hole 2111, and a sealed connection is formed between connector 2311 and first wall portion 211 to prevent harmful gases inside housing 21 from leaking out.

[0219] Connector 2311 extends from the housing 21 through the second lead-out hole 2111, thereby facilitating electrical connection between connector 2311 and external components to transmit information collected by the acquisition component 231 to the external components. By sealing connector 2311 with the first wall portion 211, the risk of harmful gas leakage is reduced, thus reducing the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack 20.

[0220] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6In some embodiments, the battery pack 20 includes a second seal 2312 disposed around the second outlet hole 2111, the second seal 2312 being used to seal the connector 2311 and the first wall portion 211.

[0221] The second seal 2312 has sealing properties and is used to seal the connector 2311 and the first wall portion 211.

[0222] "The second seal 2312 is arranged around the second outlet hole 2111" means that in the projection plane perpendicular to the thickness direction of the first wall portion 211, the projection of the second seal 2312 is arranged around the outside of the projection of the hole wall surface of the second outlet hole 2111.

[0223] Since the connector 2311 extends out of the housing 21 from the second outlet hole 2111, the second seal 2312 is also provided around the connector 2311. The second seal 2312 can abut between the circuit board 23 and the first wall portion 211. In this way, the second seal 2312 can prevent harmful gases from entering the second outlet hole 2111, so as to achieve a seal between the connector 2311 and the first wall portion 211.

[0224] The second sealing element 2312 can be a sealant, a gasket, a sealing ring, etc.

[0225] To facilitate the positioning of the second seal 2312, a second receiving groove can be provided on the circuit board 23 to accommodate the second seal 2312.

[0226] The second seal 2312 is arranged around the second lead hole 2111. Since the connector 2311 extends out of the housing 21 from the second lead hole 2111, the second seal 2312 is also arranged around the connector 2311. The second seal 2312 can abut against the circuit board 23 and the first wall portion 211, thereby sealing the connector 2311 and the first wall portion 211, which helps to reduce the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0227] In the above embodiments, both the connector 2311 and the lead-out portion 2321 are disposed on the first wall portion 211, that is, both the connector 2311 and the lead-out portion 2321 are disposed on the same wall portion of the housing 21. In other embodiments, the connector 2311 and the lead-out portion 2321 may also be disposed on different walls portions of the housing 21.

[0228] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6In some embodiments, the battery pack 20 includes a locking attachment 25 configured to lock the circuit board 23 and the first wall portion 211, the locking attachment 25 being sealed to the first wall portion 211.

[0229] The lock accessory 25 includes a first lock accessory 251 and a second lock accessory 252. The first wall portion 211 is provided with a first mounting hole 2114 and a second mounting hole 2115. The first lock accessory 251 passes through the first mounting hole 2114 and locks the circuit board 23 and the first wall portion 211. The second lock accessory 252 passes through the second mounting hole 2115 and locks the circuit board 23 and the first wall portion 211.

[0230] Optionally, both the first locking accessory 251 and the second locking accessory 252 are screws, and both the first locking accessory 251 and the second locking accessory 252 are threaded to the circuit board 23 to lock the circuit board 23 and the first wall portion 211.

[0231] In some embodiments, a first seal 2325 is disposed around a first mounting hole 2114 to seal the first lock attachment 251 and the first wall portion 211. A second seal 2312 is disposed around a second mounting hole 2115 to seal the second lock attachment 252 and the first wall portion 211.

[0232] By providing the locking attachment 25, the circuit board 23 is locked to the first wall portion 211, thereby positioning the circuit board 23 and reducing the risk of it shaking during use of the battery pack 20. This helps maintain a stable connection between the circuit board 23 and the electrode assembly 22 or other electrical connection components. The sealed connection between the locking attachment 25 and the first wall portion 211 also reduces the risk of harmful gas leakage and improves the reliability of the battery pack 20.

[0233] Please refer to Figure 7 , Figure 7 This is a cross-sectional view of a battery pack 20 provided for some embodiments of this application. In some embodiments, the electrode assembly 22 is not encapsulated and is directly housed within the housing 21.

[0234] "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.

[0235] 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.

[0236] Please refer to Figure 7 In some embodiments, a second insulating member 26 is provided between the electrode assembly 22 and the housing 21, the second insulating member 26 being used to insulate and isolate the electrode assembly 22 and the housing 21.

[0237] The second insulating member 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 second insulating member 26 can be plastic, rubber, resin, etc.

[0238] Optionally, the second insulating element 26 is an insulating adhesive disposed between the electrode assembly 22 and the housing 21.

[0239] By providing a second insulator 26 between the electrode assembly 22 and the housing 21, the second insulator 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.

[0240] Please refer to Figure 7 In some embodiments, multiple electrode assemblies 22 are arranged along a second direction, and a separator 27 is provided between two adjacent electrode assemblies 22 along the second direction.

[0241] Along the second 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.

[0242] 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.

[0243] Please refer to Figure 8 , Figure 8 This is a cross-sectional view of a battery pack 20 provided for other embodiments of this application. In other embodiments, the battery pack 20 includes a plurality of encapsulation bags 28, each encapsulating at least one electrode assembly 22, and the encapsulation bags 28 are housed within a housing 21.

[0244] 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.

[0245] The packaging bag 28 can be a soft outer shell, such as aluminum-plastic film, heat shrink film, etc.

[0246] 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.

[0247] Please refer to Figure 8 In some embodiments, a plurality of packaging bags 28 are arranged along a second direction, and a separator 27 is provided between two adjacent packaging bags 28 along the second direction.

[0248] Along the second 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.

[0249] 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.

[0250] In some embodiments, the separator 27 is made of heat-insulating material.

[0251] 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.

[0252] 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.

[0253] In some embodiments, the solid electrode assembly includes a solid electrolyte layer 222, which includes a sulfide.

[0254] When the solid electrolyte layer 222 includes sulfides, the electrode assembly 22 will generate hydrogen sulfide during use. Hydrogen sulfide is very harmful to human health, so it is even more necessary to seal it through the outer shell 21.

[0255] Please refer to Figure 4 , Figure 9 and Figure 10 , Figure 9 A cross-sectional view of an electrode assembly 22 provided in some embodiments of this application. Figure 10 Exploded views of the second wall portion 212 and the housing 213 provided for some embodiments of this application. In some embodiments, the electrode assembly 22 includes a solid electrolyte layer 222 and a plurality of electrode plates 221, wherein the solid electrolyte layer 222 is disposed between two adjacent electrode plates 221 along a second direction. The electrode plates 221 include an active material layer, wherein the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrode plates 221 is opposite. The housing 21 includes a second wall portion 212 and a third wall portion 2131, which are disposed opposite to each other along the second direction, and the second wall portion 212 and the third wall portion 2131 cooperate to press the plurality of electrode assemblies 22.

[0256] If the electrode assembly 22 includes a solid electrolyte layer 222, then the electrode assembly 22 is a solid electrode assembly.

[0257] "In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite." That is, in two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is opposite to that of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221. In other words, in two adjacent electrodes 221, the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is the positive electrode active material layer, and the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of the other electrode 221 is the negative electrode active material layer.

[0258] In some embodiments, multiple electrode sheets 221 include positive electrode sheets and negative electrode sheets. The positive electrode sheets, solid electrolyte layer 222, and negative electrode sheets are stacked along a second direction to form an electrode assembly 22. The portions of the positive and negative electrode sheets with active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active material each constitute an electrode tab. The positive and negative electrode tabs may be located together at one end of the main body or at both ends of the main body. In other embodiments, the electrode sheet 221 includes a current collector 2213, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector 2213. The solid electrolyte layer 222 and multiple electrode sheets 221 are stacked to form the electrode assembly 22. The multiple electrode sheets 221 and the solid electrolyte layer 222 are arranged along a second direction, with a solid electrolyte layer 222 disposed between adjacent electrode sheets 221.

[0259] The second wall portion 212 and the third wall portion 2131 are two wall portions of the outer casing 21 that are disposed opposite each other along the second direction. Along the second direction, a plurality of electrode assemblies 22 are disposed between the second wall portion 212 and the third wall portion 2131. The second wall portion 212 and the third wall portion 2131 cooperate to press the plurality of electrode assemblies 222 together to compress the plurality of electrode sheets 221 and the solid electrolyte layer 222.

[0260] The second wall portion 212 and the third wall portion 2131 cooperate to compress the electrode assembly 22 along the first direction, thereby pressing the electrode 221 and the solid electrolyte layer 222 together, so that the electrode 221 and the solid electrolyte layer 222 can be in close contact, thereby facilitating ion transport and reducing the internal resistance of the battery pack 20.

[0261] Please refer to Figure 4 , Figure 9 and Figure 10 In some embodiments, multiple electrode assemblies 22 are arranged along a second direction.

[0262] Multiple electrode components 22 are arranged along the second direction, that is, the arrangement direction of the multiple electrode components 22 is the same as the arrangement direction of the multiple electrode sheets 221 and the solid electrolyte layer 222.

[0263] By arranging multiple electrode components 22 along a second direction, that is, arranging multiple electrode components 22 in the same direction as arranging multiple electrode sheets 221 and solid electrolyte layer 222, the second wall portion 212 and the third wall portion 2131 can cooperate to press multiple electrode components 22 along the second direction, thereby pressing the electrode sheets 221 and solid electrolyte layer 222 of multiple electrode components 22 together, which facilitates ion transport and reduces the internal resistance of the battery pack 20.

[0264] Please refer to Figure 4 , Figure 9 and Figure 10In some embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite each other along a first direction. A third wall portion 2131 connects the fourth wall portion 2132 and the fifth wall portion 2133. The third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 are integrally formed to form a casing 213 having a first opening 2134 in a second direction. A second wall portion 212 closes the first opening 2134, and the second direction is perpendicular to the first direction.

[0265] The fourth wall portion 2132 and the fifth wall portion 2133 are two wall portions of the outer casing 21 that are arranged opposite each other along the first direction.

[0266] The third wall portion 2131 connects to the fourth wall portion 2132 and the fifth wall portion 2133, and the third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 are integrally formed. The third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133 together form a shell 213, and the shell 213 has a first opening 2134 at one end along the second direction. The shell 213 has a U-shaped structure, and the opening end of the U-shaped structure is located in the second direction.

[0267] The second wall portion 212 is connected to the end of the housing 213 that forms the first opening 2134 and seals the first opening 2134. In other words, the second wall portion 212 is separately disposed from the housing 213 and connected thereto. For example, the second wall portion 212 may be welded to the housing 213.

[0268] The housing 213 is formed by integrally molding the third wall portion 2131, the fourth wall portion 2132, and the fifth wall portion 2133. The second wall portion 212 is separately disposed and connected to the housing 213. During assembly, multiple electrode assemblies 22 can be first housed within the housing 213, and then the multiple electrode assemblies 22 can be pressed against the third wall portion 2131 along the second direction via the second wall portion 212. Afterward, the second wall portion 212 is connected to the housing 213. In this way, the second wall portion 212 and the third wall portion 2131 can be easily used to press the multiple electrode assemblies 22 together during assembly.

[0269] Please refer to Figure 4 , Figure 9 and Figure 10 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, and the housing 21 further includes a first wall portion 211 and a sixth wall portion 214, the first wall portion 211 and the sixth wall portion 214 respectively closing the second opening 2135 and the third opening 2136; the dimensions of the housing 21 along the first direction and the dimensions of the housing 21 along 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.

[0270] The shell 213 has a second opening 2135 and a third opening 2136 formed at both ends along a third direction, respectively. Please refer to... Figure 10 The third direction can be the Z direction as shown in the figure. In the embodiment shown in the figure, the third direction is parallel to the thickness direction of the first wall portion 211.

[0271] The outer casing 21 includes a first wall portion 211 and a sixth wall portion 214. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the second wall portion 212, the casing 213, and the sixth wall portion 214 together define a sealed space.

[0272] "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.

[0273] 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.

[0274] Please refer to Figure 11 and Figure 12 , Figure 11 Exploded view of battery pack 20 provided for other embodiments of this application. Figure 12 Exploded views of the fifth wall portion 2133 and the housing 213 provided for other embodiments of this application. In other embodiments, the housing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite to each other along a first direction. The fourth wall portion 2132 connects the second wall portion 212 and the third wall portion 2131. The second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 are integrally formed to form a housing 213 having a fourth opening 2137 in the first direction, and the fifth wall portion 2133 closes the fourth opening 2137. The dimension of the housing 21 along the first direction is smaller than the dimension of the housing 21 along the second direction, which is perpendicular to the first direction.

[0275] The fourth wall portion 2132 connects the second wall portion 212 and the third wall portion 2131, and the second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 are integrally formed. The second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 together form a shell 213, and the shell 213 has a fourth opening 2137 at one end along the 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.

[0276] The fifth wall portion 2133 is connected to the end of the housing 213 that forms the fourth opening 2137, and seals the fourth opening 2137. In other words, the fifth wall portion 2133 is separately disposed from and connected to the housing 213. For example, the fifth wall portion 2133 may be welded to the housing 213.

[0277] By integrally forming the second wall portion 212, the third wall portion 2131, and the fourth wall portion 2132 to form the housing 213, and separately setting and connecting the fifth wall portion 2133 to the housing 213, during assembly, multiple electrode assemblies 22 can be first inserted into the housing 213 through the fourth opening 2137, and then the fifth wall portion 2133 can be connected to the housing 213. Since the size of the outer shell 21 along the first direction is smaller than the size of the outer shell 21 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 relatively short, making assembly simpler and more convenient.

[0278] Please refer to Figure 11 and Figure 12 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 sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The dimension of the outer shell 21 along the second 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.

[0279] The outer casing 21 includes a first wall portion 211 and a sixth wall portion 214. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the casing 213, the fifth wall portion 2133, and the sixth wall portion 214 together define a sealed space.

[0280] If the dimension of the outer shell 21 along the first direction is smaller than the dimension of the outer shell 21 along the second direction, and the dimension of the outer shell 21 along the second 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 first direction is the smallest.

[0281] 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 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 the shortest, making assembly simpler and more convenient.

[0282] Please refer to Figure 13 , Figure 13 This is an exploded view of a battery pack 20 provided for further embodiments of this application. In some of these embodiments, the outer casing 21 includes a fourth wall portion 2132 and a fifth wall portion 2133, which are disposed opposite each other along a first direction. A second wall portion 212, a fourth wall portion 2132, a third wall portion 2131, and a fifth wall portion 2133 are connected end-to-end. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are integrally formed to form a casing 213 having a second opening 2135 and a third opening 2136 in a third direction. The outer casing 21 also includes a first wall portion 211 and a sixth wall portion 214, which respectively close the second opening 2135 and the third opening 2136. The first direction, the second direction, and the third direction are perpendicular to each other.

[0283] The second wall portion 212 and the third wall portion 2131 are arranged opposite each other along a second direction, the fourth wall portion 2132 and the fifth wall portion 2133 are arranged opposite each other along a first direction, and the first wall portion 211 and the sixth wall portion 214 are arranged opposite each other along a third direction. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131 and the fifth wall portion 2133 are connected end to end to form a cylindrical structure. The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131 and the fifth wall portion 2133 are integrally formed to form a shell 213. The shell 213 has a second opening 2135 and a third opening 2136 at both ends along the third direction. The first wall portion 211 closes the second opening 2135, and the sixth wall portion 214 closes the third opening 2136. The first wall portion 211, the shell 213 and the sixth wall portion 214 together define a sealed space.

[0284] The second wall portion 212, the fourth wall portion 2132, the third wall portion 2131, and the fifth wall portion 2133 are integrally formed to form the housing 213. During assembly, multiple electrode assemblies 22 can be inserted into the housing 213 through the second opening 2135 or the third opening 2136. Then, the second opening 2135 is closed by the first wall portion 211, and the third opening 2136 is closed by the sixth wall portion 214. The assembly steps are fewer and the assembly efficiency is higher.

[0285] Please refer to Figure 9In some embodiments, the electrode assembly 22 includes a solid electrolyte layer 222 and a plurality of electrodes 221, the solid electrolyte layer 222 being disposed between two adjacent electrodes 221. Each electrode 221 includes an active material layer, and in two adjacent electrodes 221, the active material layers facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 have opposite polarities.

[0286] If the electrode assembly 22 includes a solid electrolyte layer 222, then the electrode assembly 22 is a solid electrode assembly. The solid electrolyte layer 222 is disposed between two adjacent electrodes 221, and serves to both transport ions and isolate the positive and negative electrodes.

[0287] The solid electrolyte layer 222 includes a polymer solid electrolyte layer, an inorganic solid electrolyte layer, and a composite solid electrolyte layer.

[0288] 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.

[0289] 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.

[0290] As an example, a composite solid electrolyte layer is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0291] "In two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 is opposite." That is, in two adjacent electrodes 221, the polarity of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is opposite to that of the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221. In other words, in two adjacent electrodes 221, the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of one electrode 221 is the positive electrode active material layer, and the active material layer facing the solid electrolyte layer 222 located between the two adjacent electrodes 221 of the other electrode 221 is the negative electrode active material layer.

[0292] If electrode assembly 22 includes a solid electrolyte layer 222, then electrode assembly 22 is a solid electrode assembly. When electrode assembly 22 is a solid electrode assembly, the energy density of battery pack 20 is higher.

[0293] Please refer to Figure 9 In some embodiments, the plurality of electrodes 221 include a first electrode 2211 and a second electrode 2212, the first electrode 2211 and the second electrode 2212 having opposite polarities. The first electrode 2211, the solid electrolyte layer 222 and the second electrode 2212 are stacked, with the solid electrolyte layer 222 disposed between the first electrode 2211 and the second electrode 2212.

[0294] One of the first electrode 2211 and the second electrode 2212 is the positive electrode, and the other is the negative electrode. For example, when the first electrode 2211 is the positive electrode, the second electrode 2212 is the negative electrode. Or, for instance, when the first electrode 2211 is the positive electrode, the second electrode 2212 is the negative electrode.

[0295] The electrode assembly 22 includes a first electrode 2211, a solid electrolyte layer 222, and a second electrode 2212 stacked together. Thus, the electrode assembly 22 is simple and convenient to manufacture and has a low cost.

[0296] Please refer to Figure 14 , Figure 14 This is a cross-sectional view of an electrode assembly 22 provided in other embodiments of this application. In other embodiments, the electrode 221 includes a current collector 2213, a first active material layer 2214, and a second active material layer 2215, the first active material layer 2214 and the second active material layer 2215 having opposite polarities. The first active material layer 2214 and the second active material layer 2215 are respectively disposed on both sides of the current collector 2213.

[0297] The electrode 221 is a bipolar electrode. A first active material layer 2214 and a second active material layer 2215 are respectively disposed on both sides of the current collector 2213. One of the first active material layer 2214 and the second active material layer 2215 is a positive active material layer, and the other of the first active material layer 2214 and the second active material layer 2215 is a negative active material layer.

[0298] By making the electrode 221 include a current collector 2213, a first active material layer 2214 and a second active material layer 2215, with the first active material layer 2214 and the second active material layer 2215 having opposite polarities, it is beneficial to make the battery pack 20 have a higher energy density.

[0299] 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.

[0300] 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.

[0301] In some embodiments, the battery device 100 includes a busbar component electrically connected to a plurality of battery packs 20, and the busbar component and lead-out portion 2321 are connected to the output terminal base 29.

[0302] By allowing the output electrode base 29 to float on the first wall portion 211, when the lead-out portion 2321 and the busbar component are attached to the output electrode base 29, the output electrode base 29 can float in the first direction, actively adapting to the lead-out portion 2321 and the busbar component. This prevents the lead-out portion 2321 and the busbar component from deforming during connection, allowing them to fit tightly together, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack 20. Furthermore, the tight fit between the lead-out portion 2321 and the busbar component also helps improve current carrying capacity.

[0303] In some embodiments, the outer casing 21 is connected to the housing 10.

[0304] 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.

[0305] In other embodiments, the outer shell 21 is bonded to the housing 10.

[0306] 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.

[0307] This application embodiment also provides an electrical device, which includes the battery pack 20 described above.

[0308] According to some embodiments of this application, please refer to Figures 3 to 14 .

[0309] This application provides a battery pack 20, which includes a housing 21, a plurality of electrode assemblies 22, a circuit board 23, and an output electrode base 29. The housing 21 has a first wall 211 with a first lead-out hole 2112, and the plurality of electrode assemblies 22 are housed within the housing 21. A portion of the circuit board 23 is disposed between the first wall 211 and the electrode assemblies 22. The circuit board 23 includes a busbar assembly 232 electrically connected to the plurality of electrode assemblies 22, and includes a lead-out portion 2321 extending out of the housing 21 through the first lead-out hole 2112. The output electrode base 29 is disposed on the side of the first wall 211 facing away from the interior of the housing 21, and the output electrode base 29 and the lead-out portion 2321 are arranged along a first direction. Along the first direction, the output electrode base 29 is buoyantly disposed on the first wall 211 and is used to connect to the lead-out portion 2321. By allowing the output electrode base 29 to float on the first wall portion 211, when the lead-out portion 2321 and other electrical connection components are attached to the output electrode base 29, the output electrode base 29 can float along the first direction, actively adapting to the lead-out portion 2321 and other electrical connection components. This prevents the lead-out portion 2321 and other electrical connection components from deforming during connection, allowing them to fit tightly together, reducing the installation gap between them, lowering the risk of high-voltage arcing, and improving the reliability of the battery pack 20. Furthermore, the tight fit between the lead-out portion 2321 and other electrical connection components also helps improve current carrying capacity.

[0310] A slot 219 is provided on one of the output electrode base 29 and the first wall portion 211, and a protrusion 2911 is provided on the other of the output electrode base 29 and the first wall portion 211. The protrusion 2911 is movably disposed within the slot 219 along a first direction. By movably disposing the protrusion 2911 within the slot 219 along the first direction, the output electrode base 29 is floatably disposed on the first wall portion 211 along the first direction. On the one hand, the structure is simple and convenient, and easy to manufacture. On the other hand, the resistance when the output electrode base 29 floats along the first direction is small, making it less likely for the lead-out portion 2321 and other electrical connection components to deform during connection. The lead-out portion 2321 and other electrical connection components can fit tightly together, reducing the installation gap between the lead-out portion 2321 and other electrical connection components, reducing the risk of high-voltage arcing, and improving the reliability of the battery pack 20.

[0311] The electrode assembly 22 is a solid-state electrode assembly. The outer casing 21 has a sealed space, within which multiple electrode assemblies 22 are housed. The lead-out portion 2321 is sealed to the first wall portion 211. The solid-state electrode assembly 22 includes a solid electrolyte layer 222. During use, it generates harmful gases. By providing a sealed space within the outer casing 21, and housing multiple electrode assemblies 22 within this space (i.e., the outer casing 21 seals multiple electrode assemblies 22), the generated harmful gases can be contained within the outer casing 21, reducing the risk of leakage and harm to human health, thus improving the reliability of the battery pack 20. The lead-out portion 2321 is sealed to the first wall portion 211, thereby sealing both the lead-out portion 2321 and the first wall portion 211, further reducing the risk of leakage and improving the reliability of the battery pack 20.

[0312] 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 setting the data acquisition component 231 to acquire information from the electrode components 22, it is easier to evaluate the status of the electrode components 22 based on the acquired information, thereby realizing intelligent management and optimized control of the electrode components 22, which is beneficial to improving the efficiency, reliability and lifespan of the battery pack 20.

[0313] 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.

[0314] 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, characterized in that, include: The outer casing has a first wall portion, and the first wall portion is provided with a first outlet hole; Multiple electrode assemblies are housed within the housing; A circuit board is partially disposed between the first wall portion and the electrode assembly. The circuit board includes a busbar assembly that is electrically connected to a plurality of the electrode assemblies. The busbar assembly includes a lead-out portion that extends out of the housing through the first lead-out hole. An output electrode base is disposed on the side of the first wall portion away from the interior of the housing. The output electrode base and the lead-out portion are arranged along a first direction. Along the first direction, the output electrode base is buoyantly disposed on the first wall portion. The output electrode base is used to connect with the lead-out portion.

2. The battery pack according to claim 1, characterized in that, A slot is provided on one of the output electrode base and the first wall portion, and a protrusion is provided on the other of the output electrode base and the first wall portion. The protrusion is movably disposed in the slot along the first direction.

3. The battery pack according to claim 2, characterized in that, A first limiting member and a second limiting member are provided on the side of the first wall portion away from the interior of the outer shell. The first limiting member and the second limiting member are spaced apart along the second direction. The first direction, the second direction and the thickness direction of the first wall portion are perpendicular to each other. A groove is formed between the first limiting member and the second limiting member to engage with the protrusion.

4. The battery pack according to claim 3, characterized in that, The protrusion includes a first protrusion and a second protrusion. The second protrusion is disposed at one end of the first protrusion along the first direction. The first protrusion is movably disposed in the slot. Along the first direction, the second protrusion is located on the side of the first limiting member and / or the second limiting member facing the lead-out portion. The second protrusion is used to prevent the first protrusion from disengaging from the slot in a direction away from the lead-out portion.

5. The battery pack according to claim 3, characterized in that, The first limiting member includes a first limiting part and a second limiting part. The first limiting part connects the first wall part and the second limiting part. The second limiting part is disposed opposite to the first wall part along the thickness direction of the first wall part. The second limiting part extends from the first limiting part in a direction close to the second limiting member. A portion of the protrusion is located between the second limiting part and the first wall part. and / or The second limiting member includes a third limiting portion and a fourth limiting portion. The third limiting portion connects the first wall portion and the fourth limiting portion. The fourth limiting portion is disposed opposite to the first wall portion along the thickness direction of the first wall portion. The fourth limiting portion extends from the third limiting portion in a direction close to the first limiting member. A portion of the protrusion is located between the fourth limiting portion and the first wall portion.

6. The battery pack according to claim 1, characterized in that, The battery pack includes a floating nut, which includes a mounting base and a nut body. The mounting base is connected to the first wall portion, and the nut body is threadedly connected to the output electrode base.

7. The battery pack according to claim 1, characterized in that, The output electrode base includes an insulator and a metal body. The metal body is at least partially embedded in the insulator. The insulator is connected to the first wall portion. The metal body is used to connect to the lead-out portion.

8. The battery pack according to claim 7, characterized in that, The metal body is provided with a connection hole for cooperating with a connector, which is used to connect the lead-out part and the metal body.

9. The battery pack according to claim 1, characterized in that, The battery pack includes a first insulating member disposed between the lead-out portion and the wall surface of the first lead-out hole.

10. The battery pack according to claim 1, characterized in that, The electrode assembly is a solid-state electrode assembly; The housing has a sealed space, in which multiple electrode assemblies are housed, and the lead-out portion is sealed to the first wall portion.

11. The battery pack according to claim 10, characterized in that, The battery pack includes a first seal that surrounds the first outlet hole and is used to seal the outlet portion and the first wall portion.

12. The battery pack according to claim 10, characterized in that, The circuit board includes a data acquisition component, which is electrically connected to a plurality of electrode assemblies and is used to acquire information from the electrode assemblies.

13. The battery pack according to claim 12, characterized in that, The acquisition component includes a connector for electrical connection with external components; The first wall portion is provided with a second lead-out hole, and the connector extends out of the housing from the second lead-out hole and is sealed to the first wall portion.

14. The battery pack according to claim 13, characterized in that, The battery pack includes a second seal surrounding the second outlet hole, which is used to seal the connector and the first wall portion.

15. The battery pack according to claim 10, characterized in that, The battery pack includes a locking accessory configured to lock the circuit board and the first wall portion, the locking accessory being sealed to the first wall portion.

16. The battery pack according to claim 10, characterized in that, The electrode assembly is not encapsulated and is directly housed within the housing.

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

18. The battery pack according to claim 16, characterized in that, The plurality of electrode assemblies are arranged along a second direction, and a separator is provided between two adjacent electrode assemblies along the second direction.

19. The battery pack according to claim 10, characterized in that, The battery pack includes multiple encapsulation bags, each encapsulating at least one of the electrode components, and the encapsulation bags are housed within the housing.

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

21. The battery pack according to claim 18, characterized in that, The separator is made of heat-insulating material.

22. The battery pack according to claim 10, characterized in that, The solid electrode assembly includes a solid electrolyte layer, which includes a sulfide.

23. The battery pack according to any one of claims 1-22, characterized in that, The electrode assembly includes a solid electrolyte layer and a plurality of electrodes. Along the second direction, the solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layers facing the solid electrolyte layer located between the two adjacent electrodes have opposite polarities. The housing includes a second wall portion and a third wall portion, which are disposed opposite to each other along the second direction, and the second wall portion and the third wall portion cooperate to press together a plurality of electrode assemblies.

24. The battery pack according to claim 23, characterized in that, The plurality of electrode assemblies are arranged along the second direction.

25. The battery pack according to claim 23, characterized in that, The outer casing includes a fourth wall portion and a fifth wall portion, which are disposed opposite to each other along a first direction. A third wall portion connects the fourth wall portion and the fifth wall portion. The third wall portion, the fourth wall portion, and the fifth wall portion are integrally formed to form a casing having a first opening in a second direction. The second wall portion closes the first opening. The second direction is perpendicular to the first direction.

26. The battery pack according to claim 25, characterized in that, Along a third direction, the housing has a second opening and a third opening disposed opposite to each other, and the housing further includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; The dimensions of the outer shell along the first direction and the second direction are both smaller than the dimensions of the outer shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

27. The battery pack according to claim 23, characterized in that, The outer casing includes a fourth wall portion and a fifth wall portion, the fourth wall portion and the fifth wall portion are disposed opposite to each other along a first direction, the fourth wall portion connects the second wall portion and the third wall portion, the second wall portion, the third wall portion and the fourth wall portion are integrally formed to form a casing having a fourth opening in the first direction, and the fifth wall portion closes the fourth opening; The dimension of the outer casing along the first direction is smaller than the dimension of the outer casing along the second direction, and the second direction is perpendicular to the first direction.

28. The battery pack according to claim 27, characterized in that, Along a third direction, the housing has a second opening and a third opening disposed opposite to each other, and the housing further includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening; The size of the outer shell along the second 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.

29. The battery pack according to claim 23, characterized in that, The outer shell includes a fourth wall portion and a fifth wall portion, which are disposed opposite to each other along a first direction. The second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are connected end to end in sequence. The second wall portion, the fourth wall portion, the third wall portion and the fifth wall portion are integrally formed to form a shell having a second opening and a third opening in a third direction. The outer casing also includes a first wall portion and a sixth wall portion, the first wall portion and the sixth wall portion respectively closing the second opening and the third opening, and the first direction, the second direction and the third direction are perpendicular to each other.

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

31. The battery pack according to claim 30, characterized in that, The plurality of electrodes include a first electrode and a second electrode, the first electrode and the second electrode having opposite polarities, the first electrode, the solid electrolyte layer and the second electrode being stacked, and the solid electrolyte layer being disposed between the first electrode and the second electrode.

32. The battery pack according to claim 30, characterized in that, The electrode includes a current collector, a first active material layer, and a second active material layer. The first active material layer and the second active material layer have opposite polarities and are respectively disposed on both sides of the current collector.

33. A battery device, characterized in that, include: Box; Multiple battery packs according to any one of claims 1-32, wherein the multiple battery packs are housed within the housing.

34. The battery device according to claim 33, characterized in that, The battery device includes a busbar component that is electrically connected to a plurality of the battery packs; The busbar component and the lead-out portion are connected to the output electrode base.

35. The battery device according to claim 33 or 34, characterized in that, The outer shell is connected to the housing.

36. An electrical appliance, characterized in that, The electrical device includes a battery pack according to any one of claims 1-32, the battery pack being used to provide electrical energy to the electrical device.

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