Battery cell, battery device, and electric device

Abstract

This invention discloses a battery cell, a battery device, and an electrical appliance. The battery cell includes an electrode assembly, a housing, and electrode terminals. The housing has a first receiving cavity, in which the electrode assembly is housed. The housing includes intersecting first and second walls. The first wall is located on one side of the electrode assembly along a first direction, and the second wall is located on one side of the electrode assembly along a second direction. The first direction is perpendicular to the second direction. The electrode terminals are disposed on the first wall and electrically connected to the electrode assembly. At least a portion of the electrode terminals protrudes along the first direction relative to the outer surface of the first wall. Each electrode terminal includes a connecting portion located outside the first wall and extending beyond the second wall along the second direction. The connecting portion is used for electrical connection with the electrode terminals of adjacent battery cells. Based on the embodiments of this application, the space utilization rate of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, the energy density of battery devices has become an important research direction in the industry. The problem of low space utilization in battery devices is an issue that cannot be ignored. Insufficient space utilization will result in a large overall size of the battery device, which is difficult to meet the needs of the rapid development of the new energy vehicle industry. How to design battery devices to improve space utilization is a technical problem that urgently needs to be solved in battery technology. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the space utilization of the battery device.

[0005] In a first aspect, a battery cell is provided, the battery cell including an electrode assembly, a housing, and electrode terminals, wherein the housing has a first receiving cavity, the electrode assembly is received in the first receiving cavity, the housing includes an intersecting first wall and a second wall, the first wall is located on one side of the electrode assembly along a first direction, the second wall is located on one side of the electrode assembly along a second direction, the first direction is perpendicular to the second direction, the electrode terminals are disposed on the first wall, the electrode terminals are electrically connected to the electrode assembly, and the electrode terminals at least partially protrude along the first direction relative to the outer surface of the first wall, the electrode terminals include a connecting portion, the connecting portion is located outside the first wall, and the connecting portion is the portion of the electrode terminal extending along the second direction and exceeding the second wall, the connecting portion is used for electrical connection with the electrode terminals of adjacent battery cells.

[0006] In the embodiment of this application, the electrical connection between two adjacent battery cells is achieved through the electrode terminals of the battery cells, thereby eliminating the need for a busbar component. This saves the Z-axis space of the battery device, allowing the battery cells to increase their power output, thereby improving the volumetric energy density and product competitiveness of the battery device. At the same time, this design eliminates the need for a busbar component, thereby reducing the types and quantities of materials, lowering material costs, simplifying the assembly process, improving production efficiency, and enhancing the structural simplicity of the battery device.

[0007] In some embodiments, the housing further includes a third wall located on one side of the electrode assembly along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the area of ​​the third wall is larger than the area of ​​the second wall.

[0008] In the solution of this application embodiment, by designing that the area of ​​the third wall is larger than that of the second wall, the connection between the two adjacent battery cells is made to be on the side of the smaller surface with less expansion force, thereby reducing the risk of welding or connection of the connection part being prone to breakage due to greater expansion force, and improving the stability and reliability of the direct electrical connection between the electrode terminals.

[0009] In some embodiments, the connection includes a first end face located on the side of the connection facing away from the housing along a second direction, and the first end face is used for electrical connection with the first end face of the electrode terminal of an adjacent battery cell.

[0010] In the solution of this application embodiment, the electrode terminals of adjacent battery cells are directly connected end to end, which can reduce the risk of occupying additional space in the first direction, thereby further improving the space utilization of the battery device.

[0011] In some embodiments, the first wall includes a first portion and a second portion, the first portion being connected to the second portion along a second direction, and the first portion being provided with electrode terminals; wherein the outer surface of the second portion protrudes toward the first direction relative to the outer surface of the first portion.

[0012] In the embodiment of this application, by setting the outer surface of the second part to protrude in a first direction relative to the outer surface of the first part, and arranging the electrode terminals on the first part, the height space freed up by the protrusion of the second part is utilized, thereby reducing the gap between the top cover of the casing and the battery cell without increasing the overall Z-axis dimension of the battery device. In addition, since the Z-axis space that can be provided at the vehicle end is usually limited, the space freed up by the reduced gap can be used to expand the capacity of the battery cell, which is beneficial to improving the volumetric energy density of the battery device.

[0013] In some embodiments, the electrode terminal includes a second end face away from the first portion, and along a first direction, the outer surface of the second portion extends beyond or is flush with the second end face.

[0014] In the embodiments of this application, by designing the outer surface of the second part along the first direction to extend beyond or be flush with the second end face, it is convenient to arrange a cooling structure (such as a cold plate) on the top of the battery cell to directly cool the electrode terminals. Combined with bottom cooling, high-rate charging and discharging can be achieved. Compared with water cooling of the large surface of the battery cell, material costs can be reduced, thereby enhancing the market competitiveness of the product.

[0015] In some embodiments, the electrode terminal includes a first terminal portion and a second terminal portion connected together, the first wall includes a first through hole, the first terminal portion passes through the first through hole and is electrically connected to the electrode assembly, the second terminal portion is located on the side of the first wall away from the first receiving cavity, the dimension of the second terminal portion along the second direction is larger than the dimension of the first terminal portion along the second direction, and a portion of the second terminal portion extends beyond the second wall along the second direction to form a connection portion.

[0016] In the embodiments of this application, by setting the electrode terminal to include a first terminal portion and a second terminal portion, and the size of the second terminal portion along the second direction is larger than the size of the first terminal portion along the second direction, the second terminal portion can form a larger contact or limit area with the first wall, thereby enhancing the connection stability between the electrode terminal and the first wall of the housing and reducing the risk of the electrode terminal loosening or falling off when subjected to external force impact or vibration.

[0017] In a second aspect, a battery device is provided, which includes a battery cell of the first aspect or any embodiment of the first aspect.

[0018] In some embodiments, the battery device includes a plurality of battery cells arranged along a second direction, with adjacent battery cells electrically connected by a connecting portion.

[0019] In the embodiments of this application, by arranging multiple battery cells along the second direction and using their respective connecting parts to achieve direct electrical connection between adjacent cells, the busbar component is eliminated. This not only simplifies the assembly process and reduces material costs, but also frees up the Z-direction space at the top of the battery cells to increase the capacity of the battery cells, thereby increasing the volumetric energy density of the battery device.

[0020] In some embodiments, the battery device includes at least a portion of a sampling component disposed between the second walls of two adjacent battery cells along a second direction.

[0021] In the solution of this application embodiment, by disposing at least a portion of the sampling component between the second walls of two adjacent battery cells along the second direction, the existing gap space between adjacent battery cells is fully utilized to accommodate the sampling component, thereby reducing the risk of occupying additional Z-direction space by placing the sampling component on top of the battery cell, further saving Z-direction space utilization, allowing more Z-direction height to be allocated to the battery cell to increase capacity, and at the same time helping to maintain the simplicity of the top structure of the battery device.

[0022] In some embodiments, the sampling component includes a sampling section connected to the connection section, and the sampling section is used to collect voltage information and / or temperature information of the electrode terminals.

[0023] In the embodiments of this application, by directly connecting the sampling part of the sampling component to the connection part of the electrode terminal, the sampling part can directly collect voltage and / or temperature information of the electrode terminal from the connection part, thereby eliminating the need for additional sampling leads or adapter structures, simplifying the sampling path and assembly process. At the same time, since the connection part is located outside the second wall of the battery cell, the sampling part can be arranged between the second walls of two adjacent battery cells, thereby reducing the risk of occupying the Z-direction space on the top of the battery cell and further improving the space utilization of the battery device.

[0024] In some embodiments, the battery device further includes a first thermal management component disposed on the side of the first wall away from the first receiving cavity along a first direction. The first thermal management component is thermally connected to at least one of the first wall and the electrode terminals to regulate the temperature of the battery cell.

[0025] In the solution of this application embodiment, by setting the first thermal management component on the side of the first wall away from the first receiving cavity, the risk of structural occupation and expansion force interference of the large area of ​​the battery cell is reduced. Moreover, since the electrode terminal is directly located on the first wall and its second end face does not exceed the outer surface of the second part of the first wall, heat exchange of the battery cell is achieved while saving the overall space occupied inside the battery device, which is conducive to improving the volumetric energy density.

[0026] In some embodiments, the first thermal management component includes a body portion and a flow channel portion, the flow channel portion being used to contain a heat exchange medium, the flow channel portion protruding relative to the body portion in a first direction toward a direction away from the battery cell.

[0027] In the embodiment of this application, by setting the flow channel of the first thermal management component to protrude in the direction away from the battery cell relative to the main body in the first direction, the Z-direction space occupied by the flow channel is located on the side of the main body away from the battery cell, so that the flow channel does not occupy the height space of the first accommodating cavity, thereby leaving more space for the battery cell inside the battery device. Without increasing the overall Z-direction dimension of the battery device, the capacity of the battery cell can be increased, which is beneficial to further improve the volumetric energy density.

[0028] In some embodiments, the first wall includes a first portion and a second portion, the first portion being connected to the second portion along a second direction, the outer surface of the second portion protruding toward a first direction relative to the outer surface of the first portion, the first portion being provided with an electrode terminal, and a first flow channel being formed in the flow channel portion, the first flow channel being located on the side of the electrode terminal away from the first portion, so as to exchange heat with the electrode terminal.

[0029] In the embodiments of this application, by setting the first flow channel on the side of the electrode terminal away from the first part, the first thermal management component can concentrate on heat exchange in the area where the electrode terminal is located, thereby improving the heat exchange efficiency of the electrode terminal.

[0030] In some embodiments, a second flow channel is formed within the flow channel portion, the second flow channel being located on the side of the second portion away from the first receiving cavity, for heat exchange with the second portion.

[0031] In the embodiments of this application, a first flow channel is provided above the first part to exchange heat in the electrode terminal area, and a second flow channel is provided above the second part, so that the first thermal management component can cover both the first and second parts at the same time, thereby achieving comprehensive temperature regulation of the battery cell and improving the overall temperature consistency and thermal safety of the battery device.

[0032] In some embodiments, the battery cell includes a pressure relief mechanism disposed in the second part.

[0033] In the embodiment of this application, by setting the pressure relief mechanism in the second part, since the outer surface of the second part protrudes in the first direction relative to the first part, the pressure relief mechanism is located at a relatively high position on the top of the battery cell, thereby providing more space for the activation and venting of the pressure relief mechanism, which is beneficial for rapid pressure relief when the internal pressure of the battery cell reaches the threshold.

[0034] In some embodiments, the first thermal management component includes a first pressure relief area, wherein the orthographic projection of the pressure relief mechanism and the orthographic projection of the first pressure relief area at least partially overlap in a plane perpendicular to the first direction, and the first pressure relief area is used to discharge the emissions discharged through the pressure relief mechanism to the side of the first thermal management component away from the first receiving cavity.

[0035] In the embodiments of this application, by providing a first pressure relief area on the first thermal management component that at least partially overlaps with the orthographic projection of the pressure relief mechanism, the emissions discharged when the battery cell is depressurized can be directly guided through the first pressure relief area to the side of the first thermal management component facing away from the battery cell. This reduces the risk of emissions accumulating in the narrow space between the battery cell and the first thermal management component, and improves the pressure relief safety and reliability of the battery device.

[0036] In some embodiments, the battery device further includes a housing, which is a hollow structure with an opening, and a first thermal management component covers the opening to form a second receiving cavity that receives a single battery cell.

[0037] In the embodiment of this application, by directly covering the opening of the housing with the first thermal management component to form a second receiving cavity for accommodating the battery cells, the first thermal management component can regulate the heat exchange of the battery cells inside while acting as the cover of the housing to seal the battery device. This achieves integrated structure and function, eliminating the need for an additional independent housing cover, thereby improving the space utilization of the battery device, reducing the dimensional redundancy in the overall height direction, and improving the thermal management requirements of the battery cells.

[0038] In some embodiments, the housing further includes a fourth wall, with the first wall disposed opposite to the fourth wall; the battery device further includes a second thermal management component disposed on the side of the fourth wall away from the first receiving cavity, and the second thermal management component is thermally connected to the battery cell.

[0039] In the embodiment of this application, by placing the second thermal management component on the side of the fourth wall away from the first receiving cavity, since the fourth wall does not have protruding structures such as electrode terminals and connecting parts, and its outer surface is flat, the second thermal management component can form a larger area and more uniform contact with the fourth wall, thereby improving the heat exchange area and heat exchange efficiency between the second thermal management component and the battery cell, which is beneficial for rapid and uniform temperature regulation of the battery cell.

[0040] In some embodiments, the fourth wall is provided with a pressure relief mechanism, and the second thermal management component includes a second pressure relief area. On a plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism and the orthographic projection of the second pressure relief area at least partially overlap. The second pressure relief area is used to discharge the emissions discharged through the pressure relief mechanism to the side of the second thermal management component away from the first receiving cavity.

[0041] In the embodiments of this application, by providing a second pressure relief area on the second thermal management component that at least partially overlaps with the orthographic projection of the pressure relief mechanism, the emissions discharged when the battery cell is depressurized can be directly guided to the side of the second thermal management component facing away from the battery cell via the second pressure relief area, thereby reducing the risk of emissions accumulating in the narrow space between the battery cell and the second thermal management component and improving the pressure relief safety and reliability of the battery device.

[0042] Thirdly, an electrical device is provided, comprising: a battery cell of the first aspect or any embodiment of the first aspect, or a battery device of the second aspect or any embodiment of the second aspect.

[0043] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application.

[0045] Figure 2 An exploded view of a battery device provided in an embodiment of this application is shown.

[0046] Figure 3 A schematic plan view of a battery cell provided in an embodiment of this application is shown.

[0047] Figure 4 This illustration shows a cross-sectional schematic diagram of a battery cell according to an embodiment of this application. Figure 4 for Figure 3 A cross-sectional view along BB'.

[0048] Figure 5 A cross-sectional schematic diagram of a battery cell provided in an embodiment of this application is shown.

[0049] Figure 6 This illustration shows a cross-sectional schematic diagram of a battery cell according to an embodiment of this application. Figure 6 for Figure 5 Cross-sectional view along AA'.

[0050] Figure 7 A cross-sectional schematic diagram of a battery device provided in an embodiment of this application is shown.

[0051] Figure 8 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0052] Figure 9 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0053] Figure 10 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0054] Figure 11 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0055] Figure 12 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0056] Figure 13 A schematic diagram of the structure of a first thermal management component provided in an embodiment of this application is shown.

[0057] Figure 14 A schematic diagram of another first thermal management component provided in an embodiment of this application is shown.

[0058] Figure 15 A cross-sectional schematic diagram of another battery device provided in an embodiment of this application is shown.

[0059] Figure 16 A schematic diagram of another first thermal management component provided in an embodiment of this application is shown.

[0060] Figure 17 A schematic diagram of the structure of a second thermal management component provided in an embodiment of this application is shown.

[0061] Figure 18 A schematic diagram of the structure of another second thermal management component provided in an embodiment of this application is shown.

[0062] The accompanying drawings are not drawn to scale.

[0063] Explanation of reference numerals in the attached figures: Vehicle 1; Battery unit 10; Controller 200; Motor 300; Battery cell 12; Electrode assembly 120; Housing 13; First receiving cavity 14; First wall 130; Second wall 134; Third wall 135; Fourth wall 136; First part 131; Outer surface of the first part 1310; Outer surface of the first wall 1311; Second part 132; Outer surface of the second part 1321; Electrode terminal 133; Second end face 1335; First end face 1336; Second receiving cavity 15; Heat insulation 162; First insulation Insulating component 160; second insulating component 161; sampling component 17; sampling section 170; pressure relief mechanism 18; first thermal management component 19; flow channel section 220; first flow channel 221; second flow channel 222; heat exchange component 23; main body section 223; third flow channel 224; second thermal management component 24; first pressure relief area 240; second pressure relief area 241; thermally conductive adhesive layer 25; outer surface of second wall 1340; housing 20; connecting part 1337; first terminal part 1330; second terminal part 1331; first through hole 1332. Detailed Implementation

[0064] 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.

[0065] 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.

[0066] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0071] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0072] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0073] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0074] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0075] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0076] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0077] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0078] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc. For example, the battery cell can be a lithium iron phosphate battery, but this application embodiment does not limit it.

[0079] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0080] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0081] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0082] With the rapid development of the new energy vehicle industry, the overall space utilization rate of battery devices has become a crucial factor affecting the development cost and cycle time of the entire vehicle. This means that in the design and manufacturing process of electric vehicles and other products, how efficiently the internal space of the battery device is utilized directly affects the economic efficiency and development efficiency of the entire vehicle. High space utilization allows for the placement of more battery cells within a limited volume, thereby improving driving range while reducing material costs and assembly complexity.

[0083] Typically, multiple battery cells are connected in series or parallel via busbars (such as aluminum busbars) to achieve the overall power output of the battery pack. However, busbars need to be placed above or to the side of the battery cells, occupying additional space for welding or bolting connections. This not only increases the types of materials and assembly processes but also results in significant space redundancy in the Z-axis of the battery pack. Furthermore, the presence of busbars limits the flexibility of the top cooling structure of the battery cells, reducing the overall space utilization and volumetric energy density of the pack.

[0084] Therefore, the battery cell, battery device, and electrical device of the present application embodiments can solve the above-mentioned problems. This application proposes a battery cell, battery device, and electrical device. The battery cell includes an electrode assembly, a housing, and electrode terminals. The housing has a first receiving cavity, and the electrode assembly is housed in the first receiving cavity. The housing includes intersecting first and second walls. The first wall is located on one side of the electrode assembly along a first direction, and the second wall is located on one side of the electrode assembly along a second direction. The first direction is perpendicular to the second direction. Electrode terminals are disposed on the first wall and electrically connected to the electrode assembly. At least a portion of the electrode terminals protrudes along the first direction relative to the outer surface of the first wall. The electrode terminals include a connecting portion located outside the first wall and extending beyond the second wall along the second direction. The connecting portion is used for electrical connection with the electrode terminals of adjacent battery cells.

[0085] In the embodiment of this application, the electrical connection between two adjacent battery cells is achieved through the electrode terminals of the battery cells, thereby eliminating the need for a busbar component. This saves the Z-axis space of the battery device, allowing the battery cells to increase their power output, thereby improving the volumetric energy density and product competitiveness of the battery device. At the same time, this design eliminates the need for a busbar component, thereby reducing the types and quantities of materials, lowering material costs, simplifying the assembly process, improving production efficiency, and enhancing the structural simplicity of the battery device.

[0086] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0087] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0088] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0089] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 300, a controller 200, and a battery device 10 can be installed inside vehicle 1. The controller 200 controls the battery device 10 to supply power to the motor 300. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0090] Figure 2 An exploded view of a battery device 10 provided in an embodiment of this application is shown. Figure 3A schematic plan view of a battery cell 12 provided in an embodiment of this application is shown. Figure 4 A cross-sectional schematic diagram of a battery cell 12 provided in an embodiment of this application is shown. Wherein, Figure 3 for Figure 2 A schematic diagram of the XOY plane of a portion of the battery cell 12, exemplarily selected. Figure 2 The planar schematic diagram of the four battery cells 12 is thus formed. Figure 3 . Figure 4 for Figure 3 A cross-sectional view along BB'.

[0091] In some embodiments, such as Figures 2 to 4 As shown, the battery cell 12 includes an electrode assembly 120, a housing 13, and electrode terminals 133. The housing 13 has a first receiving cavity 14, in which the electrode assembly 120 is housed. The housing 13 includes an intersecting first wall 130 and a second wall 134. The first wall 130 is located on one side of the electrode assembly 120 along a first direction Z, and the second wall 134 is located on one side of the electrode assembly 120 along a second direction X. The first direction Z is perpendicular to the second direction X. The electrode terminals 133 are disposed on the first wall 130. At least a portion of the electrode terminals 133 protrudes along the first direction Z relative to the outer surface 1311 of the first wall. The electrode terminals 133 include a connecting portion 1337, which is located outside the first wall 130 and extends beyond the second wall 134 along the second direction X. The connecting portion 1337 is used for electrical connection with the electrode terminals 133 of adjacent battery cells 12.

[0092] It should be understood that the shape of the battery cell 12 in this application embodiment can be set according to actual application. As an example, the battery cell 12 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 12 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries, etc. This application has no particular limitations. For example, the embodiments of this application mainly use the battery cell 12 as such... Figure 2 The cuboid shown is used as an example for illustration.

[0093] The battery cell 12 in this embodiment can be a hollow structure with multiple walls, which form the outer shell 13 of the battery cell 12 for housing the electrode assembly. The outer shell 13 of the battery cell 12 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 13), or an aluminum-plastic film, etc. In some embodiments, the outer shell 13 can be a sealed structure or a non-sealed structure. As an example, when the outer shell 13 is a non-sealed structure, the outer shell 13 serves to protect the electrode assembly, and a sealing bag is also included between the outer shell 13 and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer shell 13 is a sealed structure, it is used to encapsulate the electrode assembly and electrolyte, etc.

[0094] The battery cell 12 includes a first wall 130, on which electrode terminals 133 are disposed. The first wall 130 can be any wall of the battery cell 12. For example, the first wall 130 can be any wall of the casing, or it can be an end cap. For ease of explanation, this embodiment of the application takes the first wall 130 being perpendicular to the first direction Z as an example. The first direction Z is perpendicular to the second direction X and to the third direction Y, but this embodiment of the application is not limited to this.

[0095] In this embodiment, the electrode terminal 133 is used for electrical connection with the electrode assembly 120 inside the battery cell 12 to output the electrical energy of the battery cell 12. The electrode terminal 133 can be directly connected to the tab of the electrode assembly 120, or indirectly connected to the tab through a current collector. The battery cell 12 may include at least one positive electrode terminal and at least one negative electrode terminal, wherein the positive electrode terminal is used for electrical connection with the positive tab, and the negative electrode terminal is used for electrical connection with the negative tab.

[0096] In this embodiment of the application, all electrode terminals 133 of the battery cell 12 can be located on any one or more walls of the battery cell 12, that is, different electrode terminals 133 can be located on the same wall or different walls of the battery cell 12. For example, as Figure 2 As shown, the embodiments of this application mainly take the battery cell 12 including two electrode terminals 133 as an example, and the two electrode terminals 133 are both located on the same wall of the battery cell 12. Here, it is taken that the two electrode terminals 133 are both located on the first wall 130 as an example, but the embodiments of this application are not limited to this.

[0097] The first wall 130 is the wall where the electrode terminal 133 is located. The second wall 134 intersects with the first wall 130. The second wall 134 can be any wall in the battery cell 12 other than the first wall 130 and the wall opposite to the first wall 130. For example, the second wall 134 can be the wall with the largest surface area or the wall with the smallest surface area in the battery cell 12.

[0098] The connecting portion 1337 is located outside the first wall 130 and extends beyond the outer surface 1340 of the second wall along the second direction X. In other words, the connecting portion 1337 protrudes relative to the outer surface 1340 of the second wall along the second direction X. In other words, the connecting portion 1337 is the portion of the electrode terminal 133 that extends along the second direction X and extends beyond the outer surface 1340 of the second wall.

[0099] In the plane perpendicular to the third direction Y, the cross-sectional shape of the connecting part 1337 can be rectangular, circular, elliptical, or other regular shapes. As an example, the cross-section of the connecting part 1337 can be set to be rectangular to facilitate processing and welding operations, while also facilitating stable surface contact with adjacent connecting parts 1337.

[0100] There are multiple options for the connection method between the connecting part 1337 and the connecting part 1337 of the adjacent battery cell 12.

[0101] For example, the connection between the connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12 can be an end-face connection. The connecting portion 1337 includes a first end face 1336 perpendicular to the second direction X, which is used to directly mate with the first end face 1336 of the electrode terminal 133 of the adjacent battery cell 12, forming an end-to-end contact. The end-face connection method has high space utilization and does not require additional space in the first direction Z.

[0102] For example, the connection between the connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12 can also be an overlapping method. The connecting portion 1337 and the adjacent connecting portion 1337 partially overlap and fit together in the first direction Z to form an overlapping structure. The overlapping method can provide a larger contact area, which is beneficial to reducing contact resistance.

[0103] For example, the connection part 1337 of one of the two adjacent battery cells 12 is connection part #1, and the connection part 1337 of the other battery cell 12 is connection part #2. The connection part #1 can be an "L" shaped structure, that is, it extends in the first direction Z and towards the first receiving cavity 14, and then extends in the second direction X. The connection part #2 extends in the second direction X and is mounted on the connection part #1. This design can improve the connection stability between the two connection parts 1337.

[0104] The connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12 can be fixedly connected by means of welding, conductive adhesive bonding, or mechanical pressing to ensure connection reliability and long-term conductivity. For example, laser welding can be used between the connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12, resulting in high connection strength and improving the connection stability between the connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12.

[0105] In the embodiment of this application, the electrical connection between two adjacent battery cells 12 is achieved through the electrode terminals 133 of the battery cell 12, thereby eliminating the need for a busbar component and saving the Z-axis space of the battery device 10 to allow the battery cells 12 to increase their power, thereby improving the volumetric energy density and product competitiveness of the battery device 10. At the same time, this design eliminates the need for a busbar component, thereby reducing the types and quantities of materials, lowering material costs, simplifying the assembly process, improving production efficiency, and enhancing the structural simplicity of the battery device 10.

[0106] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 4 The second wall 134 can be a relatively large wall in the battery cell 12, or a relatively small wall.

[0107] For example, the housing 13 also includes a third wall 135, which is located on one side of the electrode assembly 120 along a third direction, with the first direction Z, the second direction X and the third direction Y being perpendicular to each other; the area of ​​the third wall 135 is larger than the area of ​​the second wall 134.

[0108] Among them, the third wall 135 is a wall with a larger area, and the second wall 134 is a wall with a smaller area. For example, the area relationship between the first wall 130, the second wall 134 and the third wall 135 can be: the area of ​​the third wall 135 is greater than the area of ​​the second wall 134, and the area of ​​the second wall 134 is greater than the area of ​​the first wall 130; or, the area of ​​the third wall 135 is greater than the area of ​​the second wall 134, and the area of ​​the second wall 134 can be less than or equal to the area of ​​the first wall 130.

[0109] It should be understood that during the charging and discharging process of the battery cell 12, the battery cell 12 will generate expansion force. The expansion force of the wall with a larger area is greater, while the expansion force of the wall with a smaller area is relatively smaller. Therefore, by designing the area of ​​the third wall 135 to be larger than the area of ​​the second wall 134, the connection part 1337 between two adjacent battery cells 12 is connected to the side with smaller expansion force. This reduces the risk of breakage of the welding or connection of the connection part 1337 due to larger expansion force, and improves the stability and reliability of the direct electrical connection between the electrode terminals 133.

[0110] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 4 The connecting portion 1337 includes a first end face 1336, which is located on the side of the connecting portion 1337 facing away from the housing 13 along the second direction X. The first end face 1336 is used for electrical connection with the first end face 1336 of the electrode terminal 133 of the adjacent battery cell 12.

[0111] For example, the first end face 1336 can be the end face of the connecting part 1337 perpendicular to the second direction X. With this design, it is easier to connect the connecting parts 1337, increase the connection area, and improve the stability of the connection.

[0112] It should be understood that at least a portion of the connecting portion 1337 has a gap with the first wall 130 in the first direction Z. Specifically, the connecting portion 1337 extends along the second direction X and beyond the outer surface 1340 of the second wall. The connecting portion 1337 is located above the outer surface 1311 of the first wall in the first direction Z and maintains a certain distance from the outer surface 1311 of the first wall. This gap provides sufficient process space for welding operations (such as laser welding) between the connecting portion 1337 and the connecting portion 1337 of the adjacent battery cell 12, reducing the risk of interference between the welding tool and the first wall 130. In addition, when the battery cell 12 undergoes slight expansion or deformation during charging and discharging, this gap can absorb part of the deformation, reducing the compressive stress between the connecting portion 1337 and the first wall 130, thereby protecting the sealing structure between the electrode terminal 133 and the outer casing 13 from damage.

[0113] In the embodiment of this application, the electrode terminals 133 of adjacent battery cells 12 are directly connected end to end, which can reduce the risk of occupying additional space in the first direction Z, thereby further improving the space utilization of the battery device 10.

[0114] Figure 5 A cross-sectional schematic diagram of a battery cell 12 provided in an embodiment of this application is shown. Figure 6 A cross-sectional schematic diagram of a battery cell 12 provided in an embodiment of this application is shown. Figure 6 for Figure 5 Cross-sectional view along AA'.

[0115] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 6 The first wall 130 includes a first part 131 and a second part 132. The first part 131 is connected to the second part 132 along the second direction X. The first part 131 is provided with an electrode terminal 133. The outer surface 1321 of the second part protrudes toward the first direction Z relative to the outer surface 1310 of the first part.

[0116] The first part 131 is connected to the second part 132 along the second direction X; in other words, the first part 131 is connected to at least one end of the second part 132 along the first direction Z.

[0117] In one possible configuration, the first part 131 is connected to one end of the second part 132 along the first direction Z, that is, there are two parts on the first wall 130, which are: the first part 131 and the second part 132 along the second direction X. In this case, either of the two electrode terminals 133 can be set in the first part 131, and the other electrode terminal 133 can be set on the other wall.

[0118] Another possible way, such as Figures 3 to 6 As shown, the first part 131 is connected to both ends of the second part 132 along the first direction Z. More specifically, the first part 131 is connected to the second part 132 at both ends along the first direction Z, that is, the first wall 130 along the first direction Z is the second part 132-the first part 131-the second part 132. The first part 131 and the second part 132 can be an integrally formed structure.

[0119] Each of the two second parts 132 may be provided with an electrode terminal 133. For example, one second part 132 may be provided with a positive electrode terminal and the other second part 132 may be provided with a negative electrode terminal.

[0120] The outer surface 1321 of the second part refers to the surface of the second part 132 along the first direction Z and away from the first receiving cavity 14.

[0121] The outer surface 1310 of the first part refers to the surface of the first part 131 along the first direction Z and away from the first receiving cavity 14.

[0122] The outer surface 1321 of the second part protrudes in the first direction Z relative to the outer surface 1310 of the first part. In other words, the outer surface 1321 of the second part is further away from the first receiving cavity 14 relative to the outer surface 1310 of the first part, and is protruding in the direction away from the first receiving cavity 14 to form a boss structure. Alternatively, the surface of the second part 132 that is away from the first receiving cavity 14 is sunken or recessed relative to the surface of the first part 131 that is away from the first receiving cavity 14.

[0123] In the embodiment of this application, by setting the outer surface 1321 of the second part to protrude in the first direction Z relative to the outer surface 1310 of the first part, and arranging the electrode terminal 133 on the first part 131, the height space freed up by the protrusion of the second part 132 is utilized. Without increasing the overall Z-axis dimension of the battery device 10, the gap between the top cover of the housing 20 and the battery cell 12 is reduced. In addition, since the Z-axis space that can be provided at the end of the vehicle is usually limited, the space freed up by the reduced gap can be used to expand the capacity of the battery cell 12, thereby helping to improve the volumetric energy density of the battery device 10.

[0124] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 6 The electrode terminal 133 includes a second end face 1335 that is opposite to the first portion 131. Along the first direction Z, the outer surface 1321 of the second portion extends beyond or is flush with the second end face 1335.

[0125] The electrode terminal 133 includes a second end face 1335 that is away from the first portion 131. In other words, the second end face 1335 can also be described as the surface of the electrode terminal 133 along the first direction Z and away from the first receiving cavity 14.

[0126] Along the first direction Z, the outer surface 1321 of the second portion extends beyond or is flush with the second end face 1335; in other words, the second end face 1335 does not exceed the outer surface 1321 of the second portion. Specifically, the outer surface 1321 of the second portion protrudes relative to the outer surface 1310 of the first portion toward the first direction Z, and the second end face 1335 of the electrode terminal 133 is not higher than the protruding outer surface 1321 of the second portion. That is, the top surface of the electrode terminal 133 is flush with the top surface of the second portion 132, or lower than the outer surface 1321 of the second portion.

[0127] It should be understood that "flush" here means that, on a plane perpendicular to the first direction Z, the second end face 1335 of the electrode terminal 133 and the outer surface 1321 of the second portion are at the same height, with no significant step difference between them. In other words, measured along the first direction Z, the distance between the second end face 1335 and the outer surface 1321 of the second portion is zero or within a small range allowed by manufacturing and assembly tolerances, such as ±0.1 mm, ±0.2 mm, or ±0.5 mm, which may depend on machining accuracy and assembly requirements.

[0128] In the embodiment of this application, by setting the second end face 1335 of the electrode terminal 133 as the outer surface 1321 that does not exceed the second part along the first direction Z, it is convenient to arrange a cooling structure (such as a cold plate) on the top of the battery cell 12 to directly cool the electrode terminal 133. Combined with bottom cooling, high-rate charging and discharging can be achieved. Compared with water cooling of the large surface of the battery cell 12, material costs can be reduced, thereby improving the market competitiveness of the product.

[0129] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 6 The electrode terminal 133 includes a first terminal portion 1330 and a second terminal portion 1331 connected together. The first wall 130 includes a first through hole 1332. The first terminal portion 1330 passes through the first through hole 1332 and is electrically connected to the electrode assembly 120. The second terminal portion 1331 is located on the side of the first portion 131 away from the first receiving cavity 14. The size of the second terminal portion 1331 along the second direction X is larger than the size of the first terminal portion 1330 along the second direction X, and a portion of the second terminal portion 1331 extends beyond the second wall 134 along the second direction X to form a connecting portion 1337.

[0130] The second terminal portion 1331 includes a connecting portion 1337, or the portion of the second terminal portion 1331 that extends beyond the second wall 134 along the second direction X can be called the connecting portion 1337.

[0131] It should be understood that, in the first direction Z, at least a portion of the second terminal portion 1331 has a gap with the first wall 130. The specific function of this gap can be referred to the aforementioned explanation regarding the gap between the connecting portion 1337 and the first wall 130 in the first direction Z, such as providing process space for welding operations, absorbing the expansion deformation of the battery cell 12, and providing clearance space for thermal management components, etc., which will not be elaborated here.

[0132] In some embodiments, the second terminal portion 1331 and the first terminal portion 1330 can be connected by snap-fit ​​or soldering.

[0133] For example, the second terminal portion 1331 and the first terminal portion 1330 can be a "T" shaped structure, that is, the second terminal portion 1331 is the upper "I" shaped structure and the first terminal portion 1330 is the lower "I" shaped structure.

[0134] For example, the second terminal portion 1331 includes a second through hole, and at least a portion of the first terminal portion 1330 can be accommodated in the second through hole. The first wall 130 includes a first through hole 1332, or in other words, the first portion 131 includes a first through hole 1332, and at least a portion of the first terminal portion 1330 is accommodated in the first through hole 1332. The first terminal portion 1330 is electrically connected to the electrode assembly 120 through the first through hole 1332. This structure forms a stable electrode terminal 133, thereby improving the connection stability and reliability between the electrode terminal 133 and the first wall 130. The second through hole can be a blind hole or a through hole extending through the first direction Z.

[0135] For example, the second terminal portion 1331 can be fixedly connected to the first terminal portion 1330 by welding.

[0136] For example, the second terminal portion 1331 and the first terminal portion 1330 can be long "T" shaped structures, that is, the second terminal portion 1331 is short "T" shaped and the first terminal portion 1330 is "I" shaped structure.

[0137] For example, the first portion 131 includes a first through hole 1332, and the "I" of the second terminal portion 1331 is accommodated in the first through hole 1332 and connected to the "I" of the first terminal portion 1330. In this case, the first terminal portion 1330 does not need to pass through the first through hole 1332. The vertical extension of the second terminal portion 1331 extends downward to mate with the first terminal portion 1330. This structure helps to reduce the overall Z-axis height of the electrode terminal 133, further saving space.

[0138] In some embodiments, such as Figure 6 As shown, the battery cell 12 also includes a first insulating member 160 and a second insulating member 161, wherein the first insulating member 160 is located between the first portion 131 and the second terminal portion 1331; and / or, the second insulating member 161 is located between the first terminal portion 1330 and the first portion 131. By providing the first insulating member 160 and / or the second insulating member 161, electrical isolation between the electrode terminal 133 and the first portion 131 of the first wall 130 can be effectively ensured, preventing the risk of short circuit, while improving sealing performance and structural reliability.

[0139] A first insulating member 160 is disposed between the first portion 131 and the second terminal portion 1331. Specifically, the first insulating member 160 is sandwiched between the outer surface 1310 of the first portion and the inner surface (the surface facing the first receiving cavity 14) of the second terminal portion 1331. The first insulating member 160 may be made of a material with good insulation and high temperature resistance, such as ceramics, glass, high temperature resistant plastics, or rubber.

[0140] The first insulating member 160 electrically isolates the second terminal portion 1331 from the first portion 131, preventing the electrode terminal 133 from short-circuiting through the housing 13. On the other hand, a buffer layer is provided between the second terminal portion 1331 and the first portion 131 to reduce the damage to the connection structure caused by mechanical stress generated by the expansion of the battery cell 12 or vibration impact. Furthermore, the first insulating member 160 can also serve as a sealing auxiliary structure, working together with the sealing structure at the first terminal portion 1330 to ensure the sealing of the first receiving cavity 14.

[0141] Optionally, the first insulating member 160 can be configured as an annular washer, a coating layer, or an integrally molded insulating support. When the second terminal portion 1331 is connected to the first terminal portion 1330 by snap-fit ​​or welding, the first insulating member 160 can be pre-fixed to the outer surface 1310 of the first portion, or integrally injection molded with the second terminal portion 1331.

[0142] The second insulating member 161 is disposed between the first terminal portion 1330 and the first portion 131. Specifically, the first terminal portion 1330 passes through the second through hole of the first portion 131, and the second insulating member 161 is located between the outer wall of the first terminal portion 1330 and the inner wall of the second through hole. The second insulating member 161 may be made of materials such as glass, ceramic, or high-temperature resistant insulating plastic, for example, a glass seal or an insulating sleeve.

[0143] The second insulating member 161 can achieve electrical insulation between the first terminal portion 1330 and the first part 131, preventing electrical contact between the electrode terminal 133 and the housing 13; in addition, it seals the second through hole to prevent the electrolyte inside the first receiving cavity 14 from leaking to the outside, and at the same time prevents external moisture or impurities from entering the first receiving cavity 14.

[0144] As an example, the battery cell 12 may include both a first insulating member 160 and a second insulating member 161. In this case, the first insulating member 160 is responsible for insulation and buffering between the second terminal portion 1331 and the upper surface of the first portion 131, while the second insulating member 161 is responsible for insulation and sealing between the first terminal portion 1330 and the first portion 131. Together, they form comprehensive electrical isolation and sealing protection between the electrode terminal 133 and the casing 13, improving the safety and service life of the battery cell 12.

[0145] As another example, the battery cell 12 may include only the first insulator 160 or only the second insulator 161, depending on the structural design and connection method of the electrode terminals 133. For example, when the first terminal portion 1330 is insulated from the first portion 131 by other means (such as coating with an insulating layer), the second insulator 161 may be omitted; when the second terminal portion 1331 and the first portion 131 have sufficient gap or insulation treatment, the first insulator 160 may be omitted.

[0146] By providing the first insulating member 160 and / or the second insulating member 161, the risk of short circuit between the electrode terminal 133 and the outer casing 13 can be effectively reduced, thereby improving the electrical safety performance of the battery cell 12. At the same time, the first insulating member 160 can serve as a support and buffer structure for the second terminal portion 1331, and the second insulating member 161 can ensure the long-term reliability of the seal, thereby improving the stability and durability of the battery cell 12 under complex working conditions such as vibration and temperature changes.

[0147] The above description uses a single battery cell 12 as an example. The following description uses a battery assembly 10 as an example, whereby the battery assembly 10 may include a plurality of battery cells 12 arranged along the second direction X. It should be understood that any parts overlapping between the above embodiments and the following embodiments will not be repeated in the following embodiments.

[0148] The battery device 10 may include a battery cell 12 from any of the above embodiments.

[0149] Optionally, based on some embodiments of this application, reference may continue to be made to... Figure 3 and Figure 4 The battery device 10 includes a plurality of battery cells 12 arranged along the second direction X, and two adjacent battery cells 12 are electrically connected by a connecting part 1337.

[0150] Two adjacent battery cells 12 are electrically connected through a connecting part 1337, or in other words, along the second direction X, two adjacent battery cells 12 are electrically connected through their respective connecting parts 1337.

[0151] This part can be referred to in the specific description of the above-mentioned battery cell 12 embodiments, and will not be repeated here.

[0152] For example, the connecting portion 1337 includes a first end face 1336 perpendicular to the second direction X, which is used for electrical connection with the first end face 1336 of the electrode terminal 133 of the adjacent battery cell 12. The electrode terminals 133 of the adjacent battery cell 12 are directly connected end to end, which can reduce the risk of occupying additional space in the first direction Z, thereby further improving the space utilization of the battery device 10.

[0153] In the embodiment of this application, by arranging multiple battery cells 12 along the second direction X and using their respective connecting portions 1337 to achieve direct electrical connection between adjacent cells, the busbar component is eliminated. This not only simplifies the assembly process and reduces material costs, but also frees up the Z-direction space at the top of the battery cells 12 to increase the capacity of the battery cells, thereby increasing the volumetric energy density of the battery device 10.

[0154] Figure 7 A cross-sectional schematic diagram of a battery device 10 provided in an embodiment of this application is shown. Figure 8 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Figure 9 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Wherein, Figures 7 to 9 It can be Figure 2 A schematic diagram of the cross-section in the ZOX plane. Figures 7 to 9 Box 20 is not shown in the diagram.

[0155] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 9 The battery device 10 includes a sampling component 17, at least a portion of which is disposed between two adjacent battery cells 12.

[0156] One possible way to achieve this is, such as Figure 7 As shown, at least a portion of the sampling component 17 is disposed between the second walls 134 of two adjacent battery cells 12 along the second direction X.

[0157] Taking the second wall 134 as the wall with the smallest surface area among the battery cells 12 as an example, when multiple battery cells 12 are arranged along the second direction X, since the connecting portion 1337 protrudes relative to the outer surface 1340 of the second wall, and adjacent electrode terminals 133 are connected through the protruding connecting portion 1337, the second walls 134 of adjacent battery cells 12 are arranged opposite each other and form a certain gap, and at least a part of the sampling component 17 can be accommodated in this gap. By arranging the sampling component 17 in the gap between adjacent second walls 134, the lateral space naturally formed after the battery cells 12 are arranged is fully utilized, without having to occupy the Z-direction space at the top of the battery cells 12, thereby saving Z-direction space utilization and allowing more Z-direction height to be allocated to the battery cells 12 to increase capacity. At the same time, since the second wall 134 is the wall with the smallest area, its expansion force is relatively small, and placing the sampling component 17 here can reduce the risk of sampling line breakage or poor contact caused by the expansion of the battery cells 12.

[0158] Another possible way to achieve this is, such as Figure 8As shown, the sampling component 17 is connected to the surface of the connecting portion 1337 on the side away from the first receiving cavity 14. Specifically, the connecting portion 1337 is located outside the first wall 130 and protrudes along the second direction X. The surface of the connecting portion 1337 on the side away from the first receiving cavity 14 can be a plane or a curved surface. The sampling component 17 can be directly attached to or fixed to this surface to collect the voltage and / or temperature signals of the electrode terminal 133.

[0159] For example, the surface of the connecting portion 1337 away from the first receiving cavity 14 is provided with a region recessed towards the first receiving cavity 14 (e.g., a groove, countersunk hole, or stepped surface), in which the sampling component 17 can be accommodated. By embedding the sampling component 17 in the recessed region, on the one hand, the sampling component 17 can form a stable position and contact with the connecting portion 1337, ensuring the accuracy of the sampling signal; on the other hand, at least a portion of the sampling component 17 does not extend beyond the top surface of the connecting portion 1337, thereby not occupying additional Z-axis space, further saving Z-axis space utilization while achieving sampling.

[0160] For example, the battery device 10 includes multiple battery cell assemblies arranged along a third direction Y, and each battery cell assembly includes multiple battery cells 12 arranged along a second direction X. A sampling component 17 (such as a strip sampling plate or a flexible circuit board) can be mounted on the surface of the connection portion 1337 of the battery cell assembly away from the first receiving cavity 14, i.e., spanning the connection portion 1337 of the multiple battery cells 12. This mounting method facilitates centralized sampling of multiple battery cells 12, simplifies the layout of the sampling circuit, and utilizes the top plane of the connection portion 1337 as support, eliminating the need for additional sampling brackets, thus reducing cost and assembly complexity.

[0161] Another possible way to achieve this is, such as Figure 9 As shown, the housing 13 also includes a third wall 135, wherein the first wall 130, the second wall 134, and the third wall 135 intersect each other in pairs. Exemplarily, the third wall 135 is the wall with the largest area among the battery cells 12. Along the second direction X, the electrode terminals 133 extend beyond the outer surface 1340 of the second wall, and the electrode terminals 133 of two adjacent battery cells 12 are electrically connected. At least a portion of the sampling component 17 is disposed between the third walls 135 of two adjacent battery cells 12. The specific arrangement of the sampling component 17 will be described in detail later.

[0162] In the solution of this application embodiment, by disposing at least a portion of the sampling component 17 between the second walls 134 of two adjacent battery cells 12 along the second direction X, the existing gap space between adjacent battery cells 12 is fully utilized to accommodate the sampling component 17, thereby reducing the risk of occupying additional Z-direction space by arranging the sampling component 17 on the top of the battery cell 12, further saving Z-direction space utilization, so that more Z-direction height can be allocated to the battery cell 12 to increase capacity, while also helping to maintain the simplicity of the top structure of the battery device 10.

[0163] Optionally, based on some embodiments of this application, reference may be made to... Figures 7 to 9 The sampling component 17 includes a sampling section 170, which is connected to the connection section 1337. The sampling section 170 is used to collect voltage and / or temperature information of the electrode terminal 133.

[0164] For the first placement method of sampling component 17, such as Figure 7 As shown, the sampling unit 170 can be connected to the surface of the connecting part 1337 facing the sampling unit 170. Specifically, when at least a portion of the sampling component 17 is disposed between the second walls 134 of two adjacent battery cells 12 along the second direction X, the sampling unit 170 (e.g., a voltage acquisition terminal or a temperature sensor probe) can extend from the gap between the adjacent second walls 134 to the vicinity of the connecting part 1337 and connect to the surface of the connecting part 1337 facing the sampling unit 170. By directly connecting the sampling unit 170 to this surface of the connecting part 1337, direct acquisition of the voltage signal of the electrode terminal 133 can be achieved without additional adapter structures, ensuring the accuracy and real-time performance of the sampling signal. At the same time, since the connecting part 1337 itself is located at the lateral protruding position of the battery cell 12, the sampling unit 170 does not occupy Z-direction space when connected to it laterally, which helps to maintain the simplicity of the top structure of the battery device 10.

[0165] The surface can be the side (end face perpendicular to the second direction X), bottom (surface facing the first wall 130), or top (surface away from the first receiving cavity 14) of the connecting part 1337, depending on the direction and position of the sampling part 170 extending.

[0166] For the second placement method of sampling component 17, such as Figure 8As shown, the sampling unit 170 can be directly connected to any area of ​​the nearby connection portion 1337. In other words, when multiple battery cells 12 are arranged along the second direction X, each battery cell 12 has an electrode terminal 133 with a connection portion 1337, and adjacent connection portions 1337 are directly electrically connected to form a series or parallel conductive path. The sampling unit 170 can be connected to any position on this conductive path, for example, to the top surface, side surface, or end face of the connection portion 1337 of one of the battery cells 12, or to the welding point between two adjacent connection portions 1337.

[0167] For the third placement method of the sampling unit 170, such as Figure 9 As shown, the sampling section 170 extends from the gap between the third walls 135, goes around the second wall 134, and connects to the connecting section 1337 above the second wall 134.

[0168] The sampling unit 170 is electrically connected to the electrode terminal 133 (or its connection part 1337) to obtain the voltage signal of the battery cell 12. This signal can be used to monitor the state of charge, voltage balance, overcharge and over-discharge protection of the battery cell 12.

[0169] The sampling unit 170 may include a temperature sensor (such as a thermistor, thermocouple, etc.), which is thermally coupled to the electrode terminal 133 or the connection portion 1337 (e.g., attached to the surface of the connection portion 1337) to detect temperature information at the electrode terminal 133. The temperature information of the electrode terminal 133 can reflect the internal temperature state of the battery cell 12 and can be used for thermal management control, over-temperature protection, etc.

[0170] In the embodiment of this application, by directly connecting the sampling part 170 of the sampling component 17 to the connection part 1337 of the electrode terminal 133, the sampling part 170 can directly collect the voltage information and / or temperature information of the electrode terminal 133 from the connection part 1337, thereby eliminating the need for additional sampling leads or adapter structures, simplifying the sampling path and assembly process. At the same time, since the connection part 1337 is located outside the second wall 134 of the battery cell 12, the sampling part 170 can be arranged between the second walls 134 of two adjacent battery cells 12, thereby reducing the risk of occupying the Z-direction space on the top of the battery cell 12 and further improving the space utilization of the battery device 10.

[0171] Alternatively, in a third placement of the sampling component 17, such as Figure 9 As shown, the battery device 10 also includes a heat insulation component 162, which is disposed between the third walls 135 of two adjacent battery cells 12, and is spaced apart from the sampling component 17 in the first direction Z.

[0172] In the third placement of the sampling component 17, since heat insulation is required between the third walls 135 of adjacent battery cells 12, the sampling component 17 can be placed between the third walls 135 to save space while sampling temperature and / or voltage information.

[0173] More specifically, in the first direction Z, the heat insulation member 162 can be positioned towards the bottom plate of the battery device 10 (i.e., the side near the fourth wall 136), while the sampling member 17 is positioned above the heat insulation member 162 (i.e., the side near the first wall 130). This vertically spaced arrangement facilitates the extension of the sampling section 170 from the space above the heat insulation member 162 and around to the second wall 134, where it connects to the connecting section 1337 above the second wall 134.

[0174] The heat insulation element 162 can be made of a material with a low thermal conductivity, such as aerogel, foam, heat insulation cotton, plastic foam, or composite heat insulation board. The heat insulation element 162 is disposed between the third walls 135 of two adjacent battery cells 12, and its shape and size can match the gap between the third walls 135, for example, it is a rectangular plate or strip structure.

[0175] The heat insulation component 162 can block heat transfer between adjacent battery cells 12, preventing heat from rapidly spreading to adjacent battery cells 12 when one battery cell 12 experiences thermal runaway, thereby reducing the risk of heat diffusion and improving the safety of the battery device 10. In addition, the heat insulation component 162 can fill part of the gap between the third walls 135, providing some support and limiting for the battery cells 12, and reducing the relative displacement of the battery cells 12 in a vibration environment.

[0176] Figure 10 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Figure 11 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Figure 12 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Wherein, Figures 10 to 12 It can be Figure 2 A schematic diagram of the cross-section in the ZOX plane.

[0177] Optionally, based on some embodiments of this application, reference may be made to... Figures 10 to 12 The battery device 10 also includes a first thermal management component 19, which is disposed on the side of the first wall 130 away from the first receiving cavity 14 along the first direction Z. The first thermal management component 19 is thermally connected to at least one of the first wall 130 and the electrode terminal 133 for regulating the temperature of the battery cell 12.

[0178] The first thermal management component 19 is used to regulate the temperature of the battery cell 12. For example, when the temperature of the battery cell 12 is too high, heat is removed by a heat exchange medium to achieve cooling; or when the temperature of the battery cell 12 is too low, heat is provided by a heating medium or an electric heating element to achieve heating. The heat exchange medium can be water, ethylene glycol solution, or refrigerant, etc.

[0179] In the solution of this application embodiment, by setting the first thermal management component 19 on the side of the first wall 130 away from the first receiving cavity 14, the risk of structural occupation and expansion force interference on the large area of ​​the battery cell 12 is reduced. Moreover, since the electrode terminal 133 is directly located on the first wall 130 and its second end face 1335 does not exceed the outer surface 1321 of the second part of the first wall 130, heat exchange is achieved on the battery cell 12 while saving the overall space occupied inside the battery device 10, which is beneficial to improving the volumetric energy density.

[0180] The first thermal management component 19 is thermally connected to at least one of the first wall 130 and the electrode terminal 133, specifically: One situation, such as Figure 10 As shown, the first thermal management component 19 is disposed between the first wall 130 and the housing 20. Specifically, the housing 20 is a hollow structure with an opening, and the battery cell 12 is housed inside the housing 20. The first thermal management component 19 is located between the cover of the housing 20 and the first wall 130 of the battery cell 12. The first thermal management component 19 can be a plate-like structure, such as a stamped liquid cooling plate or an extruded heat spreader.

[0181] There are several options for connecting the first thermal management component to the first wall 130. For example, the first thermal management component 19 can be bonded and fixed to the outer surface 1311 of the first wall by a thermally conductive adhesive layer 25. The thermally conductive adhesive layer 25 can provide connection strength and fill the tiny gaps in the contact surface, reducing contact thermal resistance.

[0182] For example, a thermally conductive pad may be provided between the first thermal management component 19 and the first wall 130, and the first thermal management component 19 may be pressed against the surface of the first wall 130 by the cover of the housing 20 or a pressing structure.

[0183] For example, the first thermal management component 19 can also be fixed to the housing 20 or the battery cell 12 by mechanical connection (such as screws or clips).

[0184] In this configuration, the first thermal management component 19 completely covers the first wall 130 of the battery cell 12, enabling uniform temperature regulation of the top of the battery cell 12. Furthermore, the plate-like structure has a large heat exchange area and high structural strength, facilitating assembly with the housing 20.

[0185] Another situation, such as Figure 11 As shown, the first thermal management component 19 is disposed between the first wall 130 and the housing 20. The first thermal management component 19 is a heat exchanger 23 spaced apart along the second direction X. Each heat exchanger 23 includes at least one flow channel 220. The heat exchanger 23 may adopt a flat tube structure, that is, a hollow tube with a flat cross-section (rectangular or elliptical), and a flow channel for the flow of heat exchange medium is formed inside.

[0186] The heat exchanger 23 can be disposed between two adjacent battery cells 12 along the second direction X. The heat exchanger 23 can extend along the third direction Y, and its two ends can be connected to a manifold or the inlet / outlet of the heat exchange medium. This design enables point-to-point heat exchange in the top region of the battery cell 12, reducing the material usage and overall weight of the heat exchanger 23. Simultaneously, the gaps between the spaced heat exchangers 23 provide space for the sampling component 17, wiring harness, or pressure relief channel, thus improving the internal space utilization of the battery device 10.

[0187] Furthermore, when the heat exchanger 23 is a flat tube, the flat direction of the flat tube can be parallel to the first wall 130 (i.e., the larger surface of the flat tube faces the first wall 130 of the battery cell 12) to increase the thermal contact area; or the flat direction of the flat tube can be perpendicular to the first wall 130 to reduce the height occupied in the Z direction. The specific choice can be made according to the actual space and heat exchange requirements, and this application does not impose any restrictions on this.

[0188] In another case, such as Figure 12 As shown, the battery device 10 also includes a housing 20, which is a hollow structure with an opening. The first thermal management component 19 covers the opening to form a second receiving cavity 15, which receives the battery cell 12.

[0189] Specifically, the housing 20 has an upward opening, through which the battery cell 12 is inserted into the housing 20. The first thermal management component 19 acts as a cover for the housing 20, directly covering and sealing the opening. A sealing ring (such as a silicone gasket) can be provided between the edge of the first thermal management component 19 and the edge of the opening of the housing 20 to ensure sealing performance, and the components are fixedly connected by bolts, clips, or welding.

[0190] The first thermal management component 19 has a flow channel 220 for the flow of heat exchange medium, which allows it to regulate the heat exchange of the internal battery cells 12 while acting as a cover to seal the battery device 10. The surface of the first thermal management component 19 facing the battery cell 12 can be in direct contact with the first wall 130 of the battery cell 12 or indirect contact through a heat-conducting medium to achieve heat exchange.

[0191] In the embodiment of this application, by directly covering the opening of the housing 20 with the first thermal management component 19 to form a second receiving cavity 15 for accommodating the battery cell 12, the first thermal management component 19 can regulate the heat exchange of the battery cell 12 inside while acting as the cover of the housing 20 to seal the battery device 10. This achieves integrated structure and function, eliminating the need for an additional separate cover for the housing 20, thereby improving the space utilization of the battery device 10, reducing the dimensional redundancy in the overall height direction, and improving the thermal management requirements of the battery cell 12.

[0192] Figure 13 A schematic diagram of the structure of a first thermal management component 19 provided in an embodiment of this application is shown. Figure 14 A schematic diagram of another first thermal management component 19 provided in an embodiment of this application is shown. Figure 15 A cross-sectional schematic diagram of another battery device 10 provided in an embodiment of this application is shown. Wherein, Figure 15 It can be Figure 2 A schematic diagram of the cross-section in the ZOX plane. Figure 16 A schematic diagram of another first thermal management component 19 provided in an embodiment of this application is shown.

[0193] Based on the first or third scenario mentioned above, you can refer to... Figures 10 to 16 The first thermal management component 19 may include a main body 223 and a flow channel 220. The flow channel 220 is used to contain the heat exchange medium and protrudes relative to the main body 223 in a first direction Z toward the direction away from the battery cell 12.

[0194] Specifically, the first thermal management component 19 has a main body 223 and at least one flow channel 220. The main body 223 can be a flat plate or a substrate with a certain thickness. The flow channel 220 is a hollow channel formed on the main body 223, or a tubular structure formed independently and connected to the main body 223, used for supplying heat exchange medium to flow and exchange heat with the battery cell 12.

[0195] In this embodiment, the flow channel portion 220 protrudes relative to the main body portion 223 in a direction away from the battery cell 12 along the first direction Z. In other words, the flow channel portion 220 is not embedded inside the main body portion 223 or protrudes towards the battery cell 12, but rather protrudes towards the side of the first thermal management component 19 opposite to the first wall 130 of the battery cell 12. For example, the flow channel portion 220 can be formed as a raised rib structure on the outer surface of the main body portion 223, or as an independent flat tube welded to the outer surface of the main body portion 223; these raised portions are the flow channel portion 220.

[0196] As an example, the first thermal management component 19 can be an extruded aluminum liquid cooling plate, with its main body 223 being a flat substrate and its flow channel 220 being a plurality of parallel and upwardly protruding hollow channels integrally extruded on the upper surface of the substrate. Grooves are formed between adjacent flow channel 220s, which can be used to accommodate wiring harnesses or reduce weight. The inner surface of the first thermal management component 19 is a flat plane and is bonded to the first wall 130 of the battery cell 12 by thermally conductive structural adhesive.

[0197] As another example, the first thermal management component 19 is a stamped and welded liquid cooling plate, including an upper plate and a lower plate. The lower plate is flat, and the upper plate is stamped to form an upwardly convex flow channel structure. The upper and lower plates are welded and sealed outside the flow channel, thereby forming a flow channel portion 220 inside the convex portion. This structure also achieves the design of the flow channel portion 220 convex upward, while the lower plate remains flat to contact the battery cell 12.

[0198] As another example, when the first thermal management component 19 acts as the cover of the housing 20, the outer surface of the first thermal management component 19 has an upwardly protruding flow channel portion 220, while the inner surface remains flat. The sidewalls of the housing 20 extend to form a sealing connection with the edge of the first thermal management component 19, and the protruding flow channel portion 220 is located outside the housing 20 or accommodated within a reserved space above the housing 20, without increasing the Z-axis height occupancy inside the housing 20.

[0199] Wherein, the outer surface of the main body 223 refers to the surface of the main body 223 along the first direction Z and away from the first receiving cavity 14; the outer surface of the first thermal management component 19 refers to the surface of the first thermal management component 19 along the first direction Z and away from the first receiving cavity 14; and the inner surface of the first thermal management component 19 refers to the surface of the first thermal management component 19 along the first direction Z and close to the first receiving cavity 14.

[0200] In the embodiment of this application, by setting the flow channel portion 220 of the first thermal management component 19 to protrude from the main body portion 223 in the first direction Z toward the direction away from the battery cell 12, the Z-direction space occupied by the flow channel portion 220 is located on the side of the main body portion 223 away from the battery cell 12, so that the flow channel portion 220 does not occupy the height space of the first receiving cavity 14, thereby leaving more placement space for the battery cell 12 inside the battery device 10. Without increasing the overall Z-direction dimension of the battery device 10, the capacity of the battery cell 12 can be increased, which is beneficial to further improve the volumetric energy density.

[0201] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 13The first wall 130 includes a first portion 131 and a second portion 132. The first portion 131 is connected to the second portion 132 along a second direction X. The outer surface 1321 of the second portion protrudes relative to the outer surface 1310 of the first portion toward the first direction Z. The first portion 131 is provided with electrode terminals 133, such as... Figure 13 As shown, a first flow channel 221 is formed in the flow channel portion 220. The first flow channel 221 is located on the side of the electrode terminal 133 away from the first portion 131, so as to exchange heat with the electrode terminal 133.

[0202] Specifically, electrode terminals 133 are disposed on the first portion 131 of the first wall 130 and protrude from the first portion 131 along the first direction Z. The first flow channel 221 is a channel in the first thermal management component 19 for supplying heat exchange medium, and its position spatially corresponds to the electrode terminals 133, that is, the first flow channel 221 is located on the side of the electrode terminals 133 away from the first portion 131. In other words, along the first direction Z, the projection of the first flow channel 221 covers or at least partially covers the projection of the electrode terminals 133.

[0203] In the embodiment of this application, by setting the first flow channel 221 on the side of the electrode terminal 133 away from the first portion 131, the first thermal management component 19 can concentrate on heat exchange in the area where the electrode terminal 133 is located, thereby improving the heat exchange efficiency of the electrode terminal 133.

[0204] According to some embodiments of this application, optionally, such as Figures 2 to 14 As shown, a second flow channel 222 is formed in the flow channel portion 220. The second flow channel 222 is located on the side of the second portion 132 away from the first receiving cavity 14, so as to exchange heat with the second portion 132.

[0205] Specifically, the second portion 132 of the first wall 130 is a portion that protrudes in the first direction Z relative to the first portion 131. For example... Figure 14 As shown, the second flow channel 222 is another flow channel in the first thermal management component 19 besides the first flow channel 221. Its position corresponds spatially to the second part 132, that is, the second flow channel 222 is located on the side of the second part 132 away from the first receiving cavity 14. Along the first direction Z, the projection of the second flow channel 222 covers or at least partially covers the projection of the second part 132.

[0206] The first flow channel 221 and the second flow channel 222 can be interconnected or set independently. As an example, the first flow channel 221 and the second flow channel 222 can belong to the same heat exchange medium circulation loop, meaning the heat exchange medium flows sequentially through the first flow channel 221 and the second flow channel 222, simultaneously exchanging heat with the first part 131 and the second part 132. As another example, the first flow channel 221 and the second flow channel 222 can belong to different heat exchange loops.

[0207] Furthermore, the cross-sectional shape, size, and density of the first flow channel 221 and the second flow channel 222 can be designed differently according to the heat exchange requirements of their respective regions. For example, the first flow channel 221 can be designed as a more dense flow channel structure or with a larger heat exchange surface area to perform local heat exchange on the electrode terminal 133; the second flow channel 222 can be designed as a conventional flow channel structure to meet the thermal management requirements of the second part 132.

[0208] In the embodiment of this application, by providing a first flow channel 221 above the first part 131 to exchange heat in the electrode terminal 133 area, and providing a second flow channel 222 above the second part 132, the first thermal management component 19 can simultaneously cover the first part 131 and the second part 132, thereby achieving comprehensive temperature regulation of the battery cell 12, and thus improving the overall temperature consistency and thermal safety of the battery device 10.

[0209] According to some embodiments of this application, optionally, such as Figure 15 As shown, the battery cell 12 includes a pressure relief mechanism 18, which is disposed in the second part 132.

[0210] As an example, when the internal pressure or temperature of the battery cell 12 reaches a predetermined threshold, the pressure relief mechanism 18 is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 12 reaches the predetermined threshold, the pressure relief mechanism 18 performs an action or a weak structure provided in the pressure relief mechanism 18 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 12.

[0211] As an example, the pressure relief mechanism 18 can be located on any wall of the battery cell 12. For example, the first wall 130 of the battery cell 12 is provided with the pressure relief mechanism 18, that is, the electrode terminal 133 and the pressure relief mechanism 18 are located on the same wall, so as to improve the integration of the battery cell 12. As an example, the pressure relief mechanism 18 can be integrally formed with the first wall 130; or, the pressure relief mechanism 18 can also be separately provided and connected to the first wall 130.

[0212] The term "actuation" as used in this application refers to the pressure relief mechanism 18 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 12. The actions of the pressure relief mechanism 18 may include, but are not limited to: movement of components within the pressure relief mechanism 18 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 18, etc. When the pressure relief mechanism 18 is actuated, the high-temperature, high-pressure substances inside the battery cell 12 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 12 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0213] In some embodiments, when the housing 13 is a non-sealed structure, the pressure relief mechanism 18 can be configured as a through hole for discharging gas inside the battery cell 12.

[0214] The emissions from the battery cell 12 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0215] When the pressure relief mechanism 18 is provided in the second part 132, the first thermal management component 19 can be provided with a second flow channel 222. When the battery cell 12 is working normally, the heat exchange medium (such as coolant) in the second flow channel 222 can provide auxiliary heat exchange for the main body area of ​​the battery cell 12, thereby improving the overall thermal management performance.

[0216] When a thermal runaway occurs in a battery cell 12 and the pressure relief mechanism 18 is activated, the mechanism opens and ejects high-temperature emissions. These emissions directly impact the second flow channel 222 located directly above the mechanism, causing it to break. Since a low-temperature heat exchange medium flows within the second flow channel 222, the ruptured medium is ejected and sprayed around the pressure relief mechanism 18 and onto the top of the battery cell 12, rapidly cooling both the high-temperature emissions and the cell itself. The low-temperature heat exchange medium absorbs a large amount of heat and vaporizes, effectively inhibiting further heat spread and reducing the risk of thermal runaway in adjacent battery cells 12, thus suppressing the propagation of thermal runaway.

[0217] The first thermal management component 19 may also omit the second flow channel 222. That is, the flow channel of the first thermal management component 19 only includes the first flow channel 221 located above the region of the electrode terminal 133, and the flow channel portion 220 is not provided above the pressure relief mechanism 18. This can reduce the risk that the discharge from the pressure relief mechanism 18 will directly damage the second flow channel 222, thereby causing leakage of the heat exchange medium.

[0218] In the embodiment of this application, by setting the pressure relief mechanism 18 in the second part 132, since the outer surface 1321 of the second part protrudes relative to the first part 131 along the first direction Z, the pressure relief mechanism 18 is located at a relatively high position on the top of the battery cell 12, thereby providing more space for the activation and venting of the pressure relief mechanism 18, which is beneficial for rapid pressure relief when the internal pressure of the battery cell 12 reaches the threshold.

[0219] According to some embodiments of this application, optionally, such as Figure 15 and Figure 16 As shown, the first thermal management component 19 includes a first pressure relief area 240. On a plane perpendicular to the first direction Z, the orthographic projection of the pressure relief mechanism 18 and the orthographic projection of the first pressure relief area 240 at least partially overlap. The first pressure relief area 240 is used to discharge the emissions discharged through the pressure relief mechanism 18 to the side of the first thermal management component 19 away from the first receiving cavity 14.

[0220] In other words, the first pressure relief zone 240 and the pressure relief mechanism 18 have an overlapping area in the first direction Z. This overlapping area can be partially overlapping or completely overlapping.

[0221] The first pressure relief zone 240 is used to discharge the emissions through the pressure relief mechanism 18 to the side of the first thermal management component 19 away from the first receiving cavity 14. When the internal pressure of the battery cell 12 exceeds the limit and the pressure relief mechanism 18 is activated, the emissions are ejected from the pressure relief mechanism 18 and guided through the first pressure relief zone 240 to the side of the first thermal management component 19 away from the battery cell 12, thereby reducing the risk of emissions accumulating in the narrow space between the battery cell 12 and the first thermal management component 19.

[0222] As an example, the first pressure relief zone 240 can be a weak area provided on the first thermal management component 19. This weak area is structurally weaker than other areas of the first thermal management component 19. Specifically, the weak area can be formed by: locally thinning the corresponding area of ​​the first thermal management component 19; opening an annular groove or V-shaped groove in the corresponding area; using a lower strength material to make this area; or setting a pre-fabricated rupture line in this area, etc.

[0223] When the battery cell 12 is operating normally, the weak area remains intact and does not affect the function of the first thermal management component 19. When the pressure relief mechanism 18 is activated, the impact force or high temperature of the discharge can cause the weak area to rupture, forming a discharge channel for the discharge, allowing the discharge to be discharged above the first thermal management component 19 through this channel.

[0224] As another example, the first pressure relief zone 240 can be a through-hole provided on the first thermal management component 19. The through-hole extends through the thickness of the first thermal management component 19 along the first direction Z, forming a pre-fabricated exhaust channel. The shape of the through-hole can be circular, elliptical, rectangular, or slit-shaped, and its size can be designed according to the exhaust volume and emission characteristics of the pressure relief mechanism 18.

[0225] When the pressure relief mechanism 18 is activated, the discharge material is ejected directly from the pressure relief mechanism 18 and discharged through the through hole to the top of the first thermal management component 19 without damaging the first thermal management component 19 itself.

[0226] Optionally, the through hole may be equipped with auxiliary structures such as a filter screen, dust cover or one-way valve to prevent external impurities from entering the through hole, while allowing the discharge to be discharged in one direction.

[0227] As an example, the orthographic projection of the pressure relief mechanism 18 and the orthographic projection of the first pressure relief zone 240 can partially coincide. That is, the area of ​​the first pressure relief zone 240 can be larger than the projected area of ​​the pressure relief mechanism 18, but their centers are offset and only partially overlap. This design can be used to guide emissions in a specific direction.

[0228] As another example, the orthographic projection of the pressure relief mechanism 18 and the orthographic projection of the first pressure relief zone 240 can completely coincide. Specifically, the projection of the first pressure relief zone 240 can completely cover the projection of the pressure relief mechanism 18, that is, the area of ​​the first pressure relief zone 240 is greater than or equal to the projected area of ​​the pressure relief mechanism 18, and the projection of the pressure relief mechanism 18 is located within the projected area of ​​the first pressure relief zone 240, or the projection shapes and positions of the two are completely identical. This complete overlap design ensures that all emissions from the pressure relief mechanism 18 can pass through the first pressure relief zone 240 without obstruction, resulting in high exhaust efficiency and reducing the impact of emissions on the surrounding area during lateral diffusion.

[0229] In the embodiment of this application, by providing a first pressure relief area 240 on the first thermal management component 19 that at least partially overlaps with the orthographic projection of the pressure relief mechanism 18, the emissions discharged when the battery cell 12 is depressurized can be directly guided to the side of the first thermal management component 19 facing away from the battery cell 12 via the first pressure relief area 240. This reduces the risk of emissions accumulating in the narrow space between the battery cell 12 and the first thermal management component 19, and improves the pressure relief safety and reliability of the battery device 10.

[0230] Optionally, the orthographic projections of the first flow channel 221 and the first weak zone are misaligned on a plane perpendicular to the first direction Z. This design prevents damage to the first flow channel 221 in the event of a rupture in the first weak zone, which is a predetermined rupture location. When the pressure relief mechanism 18 is actuated, the impact force of the discharge or the high temperature causes the first weak zone to rupture. If the projection of the first weak zone overlaps with that of the first flow channel 221, the rupture may extend directly into the first flow channel 221, leading to damage to the flow channel wall and resulting in leakage of the heat exchange medium.

[0231] Figure 17 A schematic diagram of the structure of a second thermal management component 24 provided in an embodiment of this application is shown. Figure 18 A schematic diagram of the structure of another second thermal management component 24 provided in an embodiment of this application is shown.

[0232] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 18 The outer casing 13 also includes a fourth wall 136, with the first wall 130 and the fourth wall 136 disposed opposite each other; the battery device 10 also includes a second thermal management component 24, which is disposed on the side of the fourth wall 136 away from the first receiving cavity 14, and the second thermal management component 24 is thermally connected to the battery cell 12.

[0233] The second thermal management component 24 is used to regulate the temperature of the battery cell 12. For example, when the temperature of the battery cell 12 is too high, it removes heat through a heat exchange medium to achieve cooling; or when the temperature of the battery cell 12 is too low, it provides heat through a heating medium or an electric heating element to achieve heating. The heat exchange medium can be water, ethylene glycol solution, or refrigerant, etc.

[0234] In the embodiment of this application, by placing the second thermal management component 24 on the side of the fourth wall 136 away from the first receiving cavity 14, since the fourth wall 136 does not have protruding structures such as electrode terminals 133 and connecting portions 1337, and its outer surface is flat, the second thermal management component 24 can form a larger area and more uniform contact with the fourth wall 136, thereby improving the heat exchange area and heat exchange efficiency between the second thermal management component 24 and the battery cell 12, which is beneficial for rapid and uniform temperature regulation of the battery cell 12.

[0235] The structure and location of the second thermal management component 24 can be divided into the following three cases: One situation, such as Figures 10 to 12As shown, the second thermal management component 24 is disposed between the fourth wall 136 and the housing 20. Specifically, the housing 20 is a hollow structure with an opening, and the battery cell 12 is housed inside the housing 20. The second thermal management component 24 is located between the bottom plate of the housing 20 and the fourth wall 136 of the battery cell 12. The second thermal management component 24 can be a plate-like structure, such as a stamped liquid cooling plate or an extruded heat spreader.

[0236] There are several options for connecting the second thermal management component 24 to the fourth wall 136. For example, the second thermal management component 24 can be bonded and fixed to the outer surface of the fourth wall 136 by means of a thermally conductive adhesive layer 25. The thermally conductive adhesive layer 25 can provide connection strength and fill the tiny gaps in the contact surface, reducing contact thermal resistance.

[0237] In another configuration, the second heat management component 24 is disposed between the fourth wall 136 and the housing 20. The second heat management component 24 is a heat exchanger spaced apart along the second direction X, and each heat exchanger includes at least one flow channel. The heat exchanger may adopt a flat tube structure, that is, a hollow tube with a flat cross-section (rectangular or elliptical), and a flow channel for the heat exchange medium to flow inside.

[0238] The heat exchanger can be positioned between two adjacent battery cells 12 along the second direction X. The heat exchanger can extend along the third direction Y, with both ends connected to a manifold or the inlet / outlet of the heat exchange medium. This design enables point-to-point heat exchange in the top region of the battery cell 12, reducing the material usage and overall weight of the heat exchanger 23. Simultaneously, the gaps between the spaced heat exchangers provide space for the sampling component 17, wiring harness, or pressure relief channel, thus improving the internal space utilization of the battery device 10.

[0239] Furthermore, when the heat exchanger is a flat tube, the flat direction of the flat tube can be parallel to the fourth wall 136 (i.e., the larger surface of the flat tube faces the first wall 130 of the battery cell 12) to increase the thermal contact area; or the flat direction of the flat tube can be perpendicular to the first wall 130 to reduce the height occupied in the Z direction. The specific choice can be made according to the actual space and heat exchange requirements, and this application does not impose any restrictions on this.

[0240] In another embodiment, the battery device 10 also includes a housing 20, which is a hollow structure with an opening. The second thermal management component 24 covers the opening to form a second receiving cavity 15, which receives the battery cell 12.

[0241] Specifically, the housing 20 has a downward opening, through which the battery cell 12 is inserted into the housing 20. The second thermal management component 24, acting as the bottom plate of the housing 20, directly covers and seals the opening. A sealing ring can be provided between the edge of the second thermal management component 24 and the edge of the opening of the housing 20 to ensure sealing performance, and the components are fixedly connected by bolts, clips, or welding.

[0242] In some embodiments, such as Figure 17 and Figure 18 The second thermal management component 24 has a third flow channel 224 for the flow of heat exchange medium, which allows it to regulate the heat exchange of the internal battery cells 12 while acting as the bottom plate of the housing 20 to seal the battery device 10. The surface of the second thermal management component 24 facing the battery cell 12 can directly contact or indirectly contact the fourth wall 136 of the battery cell 12 through a heat-conducting medium to achieve heat exchange.

[0243] It should be understood that the structure of the third flow channel 224 may be consistent with that of the first flow channel 221 and / or the second flow channel 222, which will not be described in detail here.

[0244] The third flow channel 224 can be located on the side of the fourth wall 136 away from the first receiving cavity 14, which can save the Z-direction space of the battery device 10 to allow the battery cell 12 to increase its power.

[0245] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 18 The fourth wall 136 is provided with a pressure relief mechanism 18, and the second thermal management component 24 includes a second pressure relief area 241. On a plane perpendicular to the first direction Z, the orthographic projection of the pressure relief mechanism 18 and the orthographic projection of the second pressure relief area 241 at least partially overlap. The second pressure relief area 241 is used to discharge the exhaust material discharged through the pressure relief mechanism 18 to the side of the second thermal management component 24 away from the first receiving cavity 14.

[0246] Regarding the positional relationship between the pressure relief mechanism 18 and the second pressure relief zone 241, the relationship between the pressure relief mechanism 18 and the first pressure relief zone 240 can be referenced, and will not be repeated here.

[0247] In the embodiment of this application, by providing a second pressure relief area 241 on the second thermal management component 24 that at least partially overlaps with the orthographic projection of the pressure relief mechanism 18, the emissions discharged when the battery cell 12 is depressurized can be directly guided to the side of the second thermal management component 24 facing away from the battery cell 12 via the second pressure relief area 241. This reduces the risk of emissions accumulating in the narrow space between the battery cell 12 and the second thermal management component 24, and improves the pressure relief safety and reliability of the battery device 10.

[0248] In some embodiments, the orthographic projection of the third flow channel 224 and the orthographic projection of the second pressure relief zone 241 are misaligned on a plane perpendicular to the first direction Z.

[0249] For a description of the relationship between the third flow channel 224 and the second pressure relief zone 241, please refer to the description of the relationship between the first flow channel 221 and the first pressure relief zone 240. This application will not repeat it here.

[0250] According to some embodiments of this application, this application also provides an electrical device, including: the battery device 10 in any of the above embodiments.

[0251] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft.

[0252] According to some embodiments of this application, this application also provides an energy storage device, including: a battery device 10 of any of the above embodiments.

[0253] According to some embodiments of this application, see Figures 2 to 18 This application provides a battery cell 12, which includes an electrode assembly 120, a housing 13, and electrode terminals 133. The housing 13 has a first receiving cavity 14, in which the electrode assembly 120 is housed. The housing 13 includes an intersecting first wall 130 and a second wall 134. The first wall 130 is located on one side of the electrode assembly 120 along a first direction Z, and the second wall 134 is located on one side of the electrode assembly 120 along a second direction X. The first direction Z is perpendicular to the second direction X. The electrode terminals 133 are disposed on the first wall 130 and electrically connected to the electrode assembly 120. The electrode terminals 133 at least partially protrude along the first direction Z relative to the outer surface 1311 of the first wall. The electrode terminals 133 include a connecting portion 1337 located outside the first wall 130 and extending beyond the second wall 134 along the second direction X. The connecting portion 1337 is used for electrical connection with the electrode terminals 133 of adjacent battery cells 12.

[0254] The housing 13 also includes a third wall 135, which is located on one side of the electrode assembly 120 along a third direction, with the first direction Z, the second direction X, and the third direction Y being perpendicular to each other; the area of ​​the third wall 135 is larger than the area of ​​the second wall 134.

[0255] The connecting portion 1337 includes a first end face 1336, which is located on the side of the connecting portion 1337 facing away from the housing 13 along the second direction X. The first end face 1336 is used for electrical connection with the first end face 1336 of the electrode terminal 133 of the adjacent battery cell 12.

[0256] The first wall 130 includes a first part 131 and a second part 132, the first part 131 being connected to the second part 132 along a second direction X; wherein, the outer surface 1321 of the second part protrudes toward the first direction Z relative to the outer surface 1310 of the first part.

[0257] The electrode terminal 133 includes a second end face 1335 opposite to the first portion 131, and along the first direction Z, the outer surface 1321 of the second portion extends beyond or is flush with the second end face 1335.

[0258] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Electrode assembly (120); The housing (13) has a first receiving cavity (14) in which the electrode assembly (120) is received. The housing (13) includes an intersecting first wall (130) and a second wall (134). The first wall (130) is located on one side of the electrode assembly (120) along a first direction, and the second wall (134) is located on one side of the electrode assembly (120) along a second direction. The first wall (130) includes a first portion (131) and a second portion (132). The first portion (131) is connected to the second portion (132) along the second direction. The outer surface (1321) of the second portion (132) protrudes toward the first direction relative to the outer surface (1310) of the first portion (131), and the first direction is perpendicular to the second direction. An electrode terminal (133) is disposed in the first portion (131), the electrode terminal (133) is electrically connected to the electrode assembly (120), and the electrode terminal (133) protrudes at least partially relative to the outer surface (1311) of the first wall (130) along the first direction. The electrode terminal (133) includes a connecting portion (1337), the connecting portion (1337) is located outside the first wall (130), and the connecting portion (1337) is the portion of the electrode terminal (133) that extends along the second direction and beyond the second wall (134). The connecting portion (1337) is used for electrical connection with the electrode terminal of an adjacent battery cell.

2. The battery cell according to claim 1, characterized in that, The housing (13) further includes a third wall (135) located on one side of the electrode assembly (120) along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The area of ​​the third wall (135) is greater than the area of ​​the second wall (134).

3. The battery cell according to claim 1, characterized in that, The connecting portion (1337) includes a first end face (1336), which is located on the side of the connecting portion (1337) facing away from the outer casing (13) along the second direction. The first end face (1336) is used to electrically connect with the first end face of the electrode terminal of the adjacent battery cell.

4. The battery cell according to claim 1, characterized in that, The electrode terminal (133) includes a second end face (1335) facing away from the first portion (131). Along the first direction, the outer surface (1321) of the second portion (132) extends beyond or is flush with the second end face (1335).

5. The battery cell according to any one of claims 1 to 3, characterized in that, The electrode terminal (133) includes a first terminal portion (1330) and a second terminal portion (1331) connected together. The first wall (130) includes a first through hole (1332), the first terminal portion (1330) passes through the first through hole (1332) and is electrically connected to the electrode assembly (120), the second terminal portion (1331) is located on the side of the first wall (130) away from the first receiving cavity (14), the second terminal portion (1331) has a larger dimension along the second direction than the first terminal portion (1330) along the second direction, and a portion of the second terminal portion (1331) extends beyond the second wall (134) along the second direction to form the connection portion (1337).

6. A battery device, characterized in that, include: The battery cell (12) according to any one of claims 1 to 5.

7. The battery device according to claim 6, characterized in that, The battery device includes: The plurality of battery cells (12) arranged along the second direction are electrically connected to each other by the connecting part (1337).

8. The battery device according to claim 6, characterized in that, The battery device includes: A sampling component (17) is at least partially disposed between the second walls (134) of two adjacent battery cells (12) along the second direction.

9. The battery device according to claim 8, characterized in that, The sampling component (17) includes a sampling section (170), which is connected to the connection section (1337). The sampling section (170) is used to collect voltage and / or temperature information of the electrode terminal (133).

10. The battery device according to any one of claims 6 to 9, characterized in that, The battery device also includes: A first thermal management component (19) is disposed on the side of the first wall (130) away from the first receiving cavity (14) along the first direction. The first thermal management component (19) is thermally connected to at least one of the first wall (130) and the electrode terminal (133) to regulate the temperature of the battery cell (12).

11. The battery device according to claim 10, characterized in that, The first thermal management component (19) includes a main body (223) and a flow channel (220), the flow channel (220) being used to contain a heat exchange medium, the flow channel (220) protruding relative to the main body (223) in the first direction toward a direction away from the battery cell (12).

12. The battery device according to claim 11, characterized in that, The first wall (130) includes a first portion (131) and a second portion (132), the first portion (131) being connected to the second portion (132) along the second direction, and the outer surface (1321) of the second portion (132) protruding toward the first direction relative to the outer surface (1310) of the first portion (131). The first part (131) is provided with the electrode terminal (133). A first flow channel (221) is formed in the flow channel portion (220). The first flow channel (221) is located on the side of the electrode terminal (133) away from the first portion (131) to exchange heat with the electrode terminal (133).

13. The battery device according to claim 12, characterized in that, A second flow channel (222) is formed in the flow channel portion (220), and the second flow channel (222) is located on the side of the second portion (132) away from the first receiving cavity (14) to exchange heat with the second portion (132).

14. The battery device according to claim 12, characterized in that, The battery cell (12) includes a pressure relief mechanism (18), which is disposed in the second part (132).

15. The battery device according to claim 14, characterized in that, The first thermal management component (19) includes a first pressure relief zone (240). On a plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism (18) and the orthographic projection of the first pressure relief area (240) at least partially overlap, the first pressure relief area (240) being used to discharge the emissions discharged through the pressure relief mechanism (18) to the side of the first thermal management component (19) away from the first receiving cavity (14).

16. The battery device according to claim 10, characterized in that, The battery device also includes: The housing (20) is a hollow structure with an opening, and the first thermal management component (19) covers the opening to form a second receiving cavity (15) that receives the battery cell (12).

17. The battery device according to any one of claims 6 to 9, characterized in that, The outer casing (13) further includes a fourth wall (136), with the first wall (130) disposed opposite to the fourth wall (136); The battery device also includes: The second thermal management component (24) is disposed on the side of the fourth wall (136) away from the first receiving cavity (14) and is thermally connected to the battery cell (12).

18. The battery device according to claim 17, characterized in that, The fourth wall (136) is provided with a pressure relief mechanism (18), and the second thermal management component (24) includes a second pressure relief zone (241). On a plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism (18) and the orthographic projection of the second pressure relief area (241) at least partially overlap, the second pressure relief area (241) being used to discharge the emissions discharged through the pressure relief mechanism to the side of the second thermal management component (24) away from the first receiving cavity (14).

19. An electrical appliance, characterized in that, include: The battery cell according to any one of claims 1 to 5, or the battery device according to any one of claims 6 to 18.

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