Battery cells and their manufacturing methods, battery devices, and electrical devices

Abstract

This application discloses a battery cell and its manufacturing method, a battery device, and an electrical device, belonging to the field of battery technology. The battery cell includes a casing, at least one electrode assembly, and at least one electrode post. The casing includes multiple casing walls that surround to form a receiving cavity. The electrode assembly includes a main body and a tab extending from one side of the main body along a second direction. A post is disposed on the end of a first casing wall closer to the tab along the second direction. The first and second directions intersect. The multiple casing walls include two opposing first casing walls along the first direction, with the outer surface area of ​​the first casing wall being the largest. The electrode assembly is received within the receiving cavity. Each of the two first casing walls has at least one post. An adapter is received within the receiving cavity, and the post is connected to the tab via the adapter. The post of the battery cell is used to connect with the post of an adjacent battery cell along the first direction. This application can improve the volumetric energy density of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells and their manufacturing methods, battery devices, and electrical devices. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] With the continuous development of battery technology, how to improve the volumetric energy density of battery devices is one of the topics that the industry needs to study. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery cell capable of increasing the volumetric energy density of a battery device, a method for manufacturing the same, a battery device, and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery cell, comprising: a housing including a plurality of housing walls forming a receiving cavity, the plurality of housing walls including two first housing walls facing each other along a first direction, wherein the outer surface area of ​​the first housing wall is the largest among the plurality of housing walls; at least one electrode assembly received within the receiving cavity, the electrode assembly including a main body portion and a tab extending from one side of the main body portion along a second direction, the first direction intersecting the second direction; at least two terminals, each of the two first housing walls having at least one terminal, the terminal being disposed at the end of the first housing wall closer to the tab along the second direction; and an adapter received within the receiving cavity, the terminal being connected to the tab via the adapter; wherein the terminals of the battery cell are used to connect to the terminals of adjacent battery cells along the first direction.

[0007] The technical solution of this application sets the terminal posts of the battery cells on the first housing wall, which has the largest outer surface area. When the battery cells are arranged along the first direction (the thickness direction of the battery cells), the spacing between the terminal posts on the facing first housing walls of adjacent battery cells can be small or they can be in direct contact. When the terminal posts are connected by connectors, the length of the connectors can be shortened, which helps to reduce space occupation. When the terminal posts are directly connected, space is saved, thereby improving the volumetric energy density of the battery device including multiple battery cells arranged along the first direction. Furthermore, during the assembly of battery cells, the action path when connecting the terminal posts is relatively short, which helps to shorten the assembly time and improve the assembly efficiency of the battery device including multiple battery cells. In addition, the terminal posts are located at the end of the first housing wall that is closer to the tab along the second direction, which makes the terminal posts closer to the tab, which helps to shorten the length of the adapter, reduce the occupation of the receiving cavity, and help to improve the volumetric energy density. Furthermore, during the cyclic expansion / contraction of the battery cell, there will be relative displacement between the electrode assembly and the casing. The tabs and terminals are indirectly connected, and the adapter between them can absorb the displacement to a certain extent, reducing the relative displacement between the tabs and terminals and reducing the risk of tab tearing or terminal loosening.

[0008] In some embodiments, of the two first housing walls of a battery cell, at least one terminal on one of the first housing walls is a positive terminal, and at least one terminal on the other first housing wall is a negative terminal.

[0009] This arrangement allows positive and negative terminals to be positioned on opposite sides of the battery cell's casing, reducing the risk of direct contact between the positive and negative terminals due to assembly errors or vibrations, thereby decreasing the probability of accidental short circuits. Furthermore, this configuration facilitates the series connection of multiple battery cells along the first direction.

[0010] In some embodiments, of the positive terminal and the negative terminal, one end face facing away from the receiving cavity is formed with a groove that is recessed toward the receiving cavity, and the other end face facing away from the receiving cavity is formed with a protrusion that protrudes toward the side away from the receiving cavity. The protrusion of the battery cell is used to engage with the groove of the adjacent battery cell along the first direction.

[0011] In this way, adjacent battery cells are connected by a combination of protrusions and grooves, resulting in a shorter portion of the connection between the terminals that is suspended between adjacent housings along the first direction, or even hidden within the adjacent housings. This reduces the deformation of the connection between the terminals in the event of a collision involving multiple battery cells arranged along the first direction, thereby lowering the risk of short circuits. Furthermore, the protrusion-groove connection improves the alignment accuracy of adjacent battery cells along the first direction during assembly and increases the contact area, enhancing connection stability. Additionally, the protrusion-groove connection allows for rapid insertion of battery cells, improving assembly efficiency.

[0012] In some embodiments, the end faces of both the positive and negative terminals facing away from the receiving cavity are formed with grooves that are recessed toward the receiving cavity, and the groove of the positive terminal of the battery cell is used to connect with the groove of the negative terminal of the adjacent battery cell along the first direction through a first connector; and / or, the end faces of both the positive and negative terminals facing away from the receiving cavity are formed with protrusions that protrude toward the side opposite to the receiving cavity, and the protrusion of the positive terminal of the battery cell is used to connect with the protrusion of the negative terminal of the adjacent battery cell along the first direction through a second connector.

[0013] Thus, both the positive and negative terminals are provided with protrusions and / or grooves. When the battery cells are arranged along the first direction, the terminals of adjacent battery cells are indirectly connected by connectors. Since the spacing between the terminals located on the first housing walls facing each other of adjacent battery cells is small, the length of the connector can be shortened, which helps to reduce the space occupied and thereby improve the volumetric energy density of the battery device including multiple battery cells. Furthermore, when two terminals with grooves are connected by the first connector, the first connector is inserted into the two grooves, which makes the portion of the connection between the terminals suspended between adjacent housings along the first direction relatively short, or can be hidden inside the adjacent housings. Therefore, in the event of a collision between multiple battery cells arranged along the first direction, the deformation of the connection between the terminals can be reduced, thereby reducing the risk of short circuit.

[0014] In some embodiments, the positive terminal of a battery cell is used to connect to the negative terminal of another battery cell adjacent along a first direction.

[0015] This allows adjacent battery cells to be connected in series to form a group, increasing the output voltage and meeting the needs of more high-power applications. Furthermore, the series connection method allows for flexible adjustment of the voltage level by adjusting the number of cells, reducing current loss and improving efficiency.

[0016] In some embodiments, the electrode assembly includes a main body and a tab extending from one side of the main body along a second direction. The electrode post is disposed at one end of the first housing wall closer to the tab along the second direction, and the electrode post is disposed at the middle part of the first housing wall along a third direction. The first direction, the second direction, and the third direction intersect each other.

[0017] This arrangement ensures that the terminals and tabs are relatively close, facilitating connection between them, shortening the current conduction path, reducing current transmission losses, and thus lowering internal resistance. Furthermore, the centered placement of the terminals in the third direction minimizes their exposure from the outer casing along the sides, further reducing the risk of short circuits.

[0018] In some embodiments, when projected along the second direction, the orthographic projection of the pole and the orthographic projection of the main body overlap.

[0019] Thus, the portion of the electrode post located within the cavity occupies space on one side of the main body along the second direction, resulting in a smaller distance between the electrode assembly and the first housing wall. This improves the space utilization rate in the first direction within the cavity, thereby increasing the volumetric energy density of the battery cell.

[0020] In some embodiments, when projected along a first direction, the orthographic projection of the pole post and the orthographic projection of the tab have an overlapping portion.

[0021] This design helps to reduce the space occupied by the poles and tabs in the second and third directions within the housing cavity, thereby increasing the utilization rate of the space in the second and third directions within the housing cavity and thus improving the volumetric energy density of the battery cell.

[0022] In some embodiments, the electrode tab includes an extension extending from the body portion and a connecting portion connected to the extension portion, at least a portion of the connecting portion extending along a first direction, and an adapter connected to the surface of the connecting portion opposite to the body portion and connected to the electrode post.

[0023] The electrode tab includes an extension portion extending from the main body and a connecting portion connected to the extension portion. At least a portion of the connecting portion extends along a first direction, thereby reducing the space occupied by the electrode tab in a second direction. Furthermore, the adapter is connected to the surface of the connecting portion facing away from the main body, which helps to increase the connection area between the electrode tab and the adapter and improve the connection strength between the two.

[0024] In some embodiments, the connecting portion includes a boss portion and a recess portion. The boss portion is connected to the protrusion portion and the recess portion on opposite sides along a first direction, respectively. The recess portion is recessed relative to the side of the boss portion facing the main body portion, and the surface of the recess portion facing away from the main body portion is connected to the adapter.

[0025] In this way, by connecting the recessed portion with the adapter, the space occupied by the adapter and the tab along the second direction can be reduced, further improving the space utilization of the cavity and thus increasing the volumetric energy density of the battery cell.

[0026] In some embodiments, the adapter includes a first part and a second part connected to each other, the first part extending along a first direction and the second part extending along a second direction, the first part being connected to a recessed portion and the second part being connected to an electrode post.

[0027] The first part extends along the first direction, and a portion of the first part connects to the surface of the recessed portion facing away from the main body, thereby reducing the space occupied by the adapter in the second direction. Furthermore, the second part extends along the second direction, which increases the connection area between the second part and the pole post, thereby improving the connection strength and reliability between the pole post and the adapter.

[0028] In some embodiments, the electrode tab includes an extension extending from the main body and a connecting portion connected to the extension, at least a portion of the connecting portion extending in a second direction, an adapter connecting to the surface of the connecting portion facing the first housing wall, and a connecting post.

[0029] This design increases the connection area between the tab and the adapter, improves the connection strength and reliability between the tab and the adapter, increases the current flow area, and reduces current resistance.

[0030] In some embodiments, the adapter includes a third part, a fourth part, and a fifth part. The third part and the fifth part both extend along a second direction. The fourth part extends along a direction intersecting the second direction and connects between the third part and the fifth part. Along a first direction, the third part is closer to the connecting part than the fifth part. The third part and the fifth part are respectively connected to the mutually oriented surfaces of the connecting part and the pole post.

[0031] This design increases the connection area between the adapter and the pole, as well as the connection area between the adapter and the tab, thereby improving the connection strength and reliability of the adapter connecting the pole and the tab, increasing the current flow area, and reducing current resistance.

[0032] In some embodiments, the first housing wall is formed with a terminal mounting hole extending in a first direction, the terminal passing through the terminal mounting hole, a portion of the terminal extending into the receiving cavity and connecting with the electrode tab, and another portion extending in the first direction toward the side opposite to the receiving cavity and beyond the outer surface of the first housing wall. The battery cell also includes an insulating structure disposed between the terminal and the first housing wall.

[0033] Thus, by extending part of the terminal post outside the outer casing, the connection operation between the terminals is facilitated during the assembly of battery cells, enhancing connection reliability. Furthermore, it helps reduce the space occupied by the terminal post within the housing cavity, thus improving the energy density of the battery cells. Additionally, it improves the sealing effect between the terminal post and the casing, reducing the risk of electrolyte leakage. The insulating structure ensures insulation between the terminal post and the first casing wall, reducing the risk of short circuits.

[0034] In some embodiments, the electrode assembly is a wound structure or a stacked structure.

[0035] Electrode assemblies with wound structures have lower manufacturing costs, simpler manufacturing processes, and higher manufacturing efficiency, making them suitable for mass production. Electrode assemblies with stacked structures offer better safety and stability; their layered structure reduces the risk of internal short circuits within individual battery cells, thus mitigating safety hazards.

[0036] The second aspect of this application provides a battery device including a plurality of battery cells provided in the first aspect, the plurality of battery cells being arranged along a first direction, and any two adjacent battery cells being connected by terminals facing each other.

[0037] Because the battery device includes multiple battery cells provided by the first aspect, the battery device has a high volumetric energy density.

[0038] In some embodiments, in any two mutually facing first housing walls of any adjacent battery cell, at least one electrode post provided on one first housing wall has a protrusion, and at least one electrode post provided on the other first housing wall has a groove, with the protrusion and the groove engaging and connecting.

[0039] In this way, adjacent battery cells are connected by a protrusion and a groove, resulting in a shorter portion of the connection between the terminals that is suspended between adjacent housings along the first direction, or even hidden within the adjacent housings. This reduces the deformation of the connection between the terminals in the event of a collision involving multiple battery cells arranged along the first direction, thereby lowering the risk of short circuits. Furthermore, the protrusion and groove connection improves the alignment accuracy of adjacent battery cells along the first direction during assembly and increases the contact area, enhancing connection stability. Additionally, the protrusion-groove interface allows for quick insertion of battery cells, improving assembly efficiency.

[0040] In some embodiments, at least one terminal post in each of the two mutually facing first housing walls of any adjacent battery cell is provided with a groove, and the battery device further includes a first connector, a portion of which is inserted into the groove of one terminal post and another portion of which is inserted into the groove of the other terminal post.

[0041] In this way, the terminals of adjacent battery cells are connected by a first connector. Furthermore, a portion of the first connector mates with the grooves in the terminals, improving terminal alignment accuracy, increasing production yield, and enhancing connection strength. Moreover, the insertion of the first connector into two grooves allows for a shorter portion of the connection between the terminals that is suspended between adjacent housings along the first direction, or it can be hidden within the adjacent housings. This reduces the deformation of the connection between the terminals in the event of a collision involving multiple battery cells arranged along the first direction, thereby lowering the risk of short circuits.

[0042] In some embodiments, the first connector includes a first body portion and two protrusions protruding from opposite sides of the first body portion, the two protrusions of the first connector respectively engaging with the grooves of the two pole posts, and the first body portion being disposed between the end faces of the two pole posts.

[0043] The first body is clamped between the two terminals, forming a mechanical locking effect that effectively suppresses stress deformation during charging and discharging. Furthermore, the terminals between adjacent outer shells are less susceptible to impacts from external forces in the first direction, which improves the structural stability of the terminals and reduces the risk of short circuits.

[0044] In some embodiments, an elastic conductive element is sandwiched between the outer peripheral surface of the protrusion and the groove wall; and / or, a conductive adhesive layer is bonded between the outer peripheral surface of the protrusion and the groove wall.

[0045] An elastic conductive element is clamped between the outer peripheral surface of the protrusion and the groove wall to improve the connection strength between the protrusion and the groove. A conductive adhesive layer is provided between the outer peripheral surface of the protrusion and the groove wall to improve the connection strength between the protrusion and the groove, thereby improving the connection reliability between adjacent battery cells.

[0046] In some embodiments, in any two first housing walls facing each other in any adjacent battery cell, at least one terminal post on each first housing wall is provided with a protrusion. The battery device further includes a second connector, which includes a second body portion, and recesses are formed on opposite sides of the second body portion. The recesses on both sides of the second connector respectively engage with the protrusions of the two terminal posts.

[0047] Thus, the terminals of adjacent battery cells are connected by a first connector. Furthermore, the recessed portion of the first connector mates with the protrusion of the terminal, improving terminal alignment accuracy, increasing production yield, and enhancing connection strength. The second body portion is clamped between the two terminals, creating a mechanical locking effect that effectively suppresses stress deformation during charging and discharging. Moreover, the terminals between adjacent casings are less susceptible to impacts from external forces in the first direction, improving structural stability and reducing the risk of short circuits.

[0048] In some embodiments, a sheet is sandwiched between adjacent battery cells, the sheet having a clearance hole extending along a first direction, and the connected terminal passes through the clearance hole. The sheet includes at least one of a heat insulation pad, a heat exchange element, and a buffer pad.

[0049] This further shields the pole, making it less susceptible to impacts from external objects, resulting in high structural stability and reducing the risk of short circuits. Furthermore, the pole occupies less space in the first direction, further increasing volumetric energy density.

[0050] In some embodiments, the battery device further includes a battery box, which includes a box body and a cover covering the box body, forming a receiving space between the box body and the cover, in which multiple battery cells are received, and the arrangement direction of the box body and the cover is perpendicular to or consistent with a first direction.

[0051] Thus, because the interconnected terminals of adjacent battery cells are not easily impacted by external objects, the battery cells can be placed upright or flat inside the battery box, both of which can reduce the damage to the terminals. The high structural stability of the terminals reduces the risk of short circuits.

[0052] A third aspect of this application provides an electrical device including the battery device provided in the second aspect, the battery device being used to store or provide electrical energy.

[0053] Because the battery device provided by the second aspect has a high volumetric energy density, the power supply device also has a high volumetric energy density.

[0054] The fourth aspect of this application provides a method for manufacturing a battery cell, comprising:

[0055] Make the side panels.

[0056] The side panel includes two first shell walls that are opposite each other along a first direction. The side panel has an inner cavity with a first opening and a second opening at both ends along a second direction, and the first direction and the second direction intersect each other.

[0057] At least one pole post is installed on each of the two first housing walls.

[0058] The pole post is closer to the first opening than the second opening, and the end of the pole post facing the inner cavity extends beyond the inner surface of the first housing wall;

[0059] Provides a base plate, a top cover, an adapter, and at least one electrode assembly;

[0060] Connect the adapter to the tabs of the electrode assembly;

[0061] Insert the electrode assembly into the inner cavity through the second opening;

[0062] Connect the adapter to the pole;

[0063] Seal the second opening in the base plate;

[0064] Seal the first opening with the top cover;

[0065] The side panels, bottom plate, and top cover together form the outer shell. Among all the shell walls, the outer surface of the first shell wall has the largest area.

[0066] By first inserting the electrode assembly through the second opening and then installing the base plate, the step of having the main body of the electrode assembly enter the inner cavity through the first opening can be eliminated. This reduces the possibility of the electrode assembly colliding with the terminal post during the insertion process, allowing the battery cell manufacturing steps to proceed smoothly and improving the manufacturing yield of the battery cells. Furthermore, the battery cells produced by this method have high volumetric energy density and low short-circuit risk.

[0067] The beneficial effects of the embodiments disclosed herein include: through this application, a battery cell capable of improving the volumetric energy density of a battery device, a method for manufacturing the same, a battery device, and an electrical device are provided. Attached Figure Description

[0068] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0069] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments;

[0070] Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments;

[0071] Figure 3 An exploded perspective view of a portion of the battery device structure according to one or more embodiments;

[0072] Figure 4 This is a three-dimensional exploded view of a battery cell according to one or more embodiments;

[0073] Figure 5 This is a three-dimensional structural diagram of a battery cell according to one or more embodiments;

[0074] Figure 6 for Figure 5 A three-dimensional structural diagram of the structure from another perspective;

[0075] Figure 7This is a three-dimensional structural schematic diagram of a plurality of battery cells of a battery device according to one or more embodiments;

[0076] Figure 8 A three-dimensional structural diagram of a battery cell with its outer casing removed, according to one or more embodiments;

[0077] Figure 9 A cross-sectional view of a battery cell with a first structure according to one or more embodiments;

[0078] Figure 10 A cross-sectional view of a battery cell of a second structure according to one or more embodiments in an assembled state;

[0079] Figure 11 A cross-sectional view of a battery cell and a first connector according to one or more embodiments of a third structure;

[0080] Figure 12 A cross-sectional view of a battery cell and a second connector according to one or more embodiments of a fourth structure;

[0081] Figure 13 for Figure 8 Enlarged view of point A in the middle;

[0082] Figure 14 for Figure 10 Enlarged view of point B in the middle;

[0083] Figure 15 A partial cross-sectional view of a battery cell with a fifth structure according to one or more embodiments;

[0084] Figure 16 A three-dimensional structural schematic diagram of a battery cell according to a sixth structure based on one or more embodiments;

[0085] Figure 17 This is a three-dimensional structural schematic diagram of a battery cell according to a sixth structure based on one or more embodiments, from another perspective.

[0086] Figure 18 A process for manufacturing a battery cell according to one or more embodiments Figure 1 ;

[0087] Figure 19 This is a schematic diagram of the structure obtained when multiple steps in the battery cell manufacturing process are completed using one or more embodiments of the battery cell manufacturing method;

[0088] Figure 20 A process for manufacturing a battery cell according to one or more embodiments Figure 2 ;

[0089] Figure 21A process for manufacturing a battery cell according to one or more embodiments Figure 3 ;

[0090] Figure 22 This is a schematic diagram of the structure obtained when multiple additional steps in the manufacturing process of a battery cell are completed using a battery cell manufacturing method according to one or more embodiments.

[0091] Explanation of reference numerals in the attached figures

[0092] 1000, Vehicle; 100, Battery assembly; 10, Battery box; 101, Box cover; 102, Box body; 200, Controller; 300, Motor; 20, Battery cell; 1, Outer shell; 11, Shell wall; 11a, First shell wall; 111, Terminal mounting hole; 12, Top cover; 13, Shell; 131, Side panel; 132, Bottom plate; 141, First opening; 142, Second opening; 2, Electrode assembly; 21, Tab; 21a, Positive tab; 21b, Negative tab; 211, Protrusion; 212, Connecting part; 2121, Boss. ; 2122, Recessed section; 22, Main body section; 3, Terminal post; 3a, Positive terminal post; 3b, Negative terminal post; 31, Groove; 32, Protrusion; 4, Pressure relief mechanism; 5, Adapter; 51, First part; 52, Second part; 53, Third part; 54, Fourth part; 55, Fifth part; 6, Insulating structure; 7, Elastic conductive element; 8, Sheet; 91, First connector; 911, First body section; 912, Protrusion; 92, Second connector; 921, Second body section; 922, Recessed section; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0093] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0095] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0096] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0097] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0098] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0099] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0100] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0101] The following is a detailed description of this application.

[0102] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0103] In related technologies, the terminals of the battery cells are located on the top cover of the casing, and the battery cells are arranged along the thickness direction of the battery cells. The terminals of multiple battery cells arranged in this way are connected by a plate located at the top of the terminal. The spacing between the terminals of adjacent battery cells is relatively large, requiring the use of a larger plate. As a result, the space occupied inside the battery box of the battery device is relatively large, leading to a lower volumetric energy density of the battery device including the battery cells.

[0104] Research has shown that placing the terminals of individual battery cells on the large surface of the casing can shorten the distance between the terminals of adjacent battery cells, thereby reducing the size of the battery cells or even eliminating them altogether. This reduces space requirements and helps improve the volumetric energy density of the battery device.

[0105] Based on this design concept, this application provides a battery cell, which includes a housing, at least one electrode assembly, and at least two terminals. The housing includes multiple housing walls that surround and form a receiving cavity. The multiple housing walls include two first housing walls that are opposite each other along a first direction. Among the multiple housing walls, the outer surface area of ​​the first housing wall is the largest. At least one electrode assembly is received within the receiving cavity. Each of the two first housing walls is provided with at least one terminal, which is connected to the tab of the electrode assembly. The terminal of the battery cell is used to connect with the terminal of the battery cell adjacent to it along the first direction.

[0106] By placing the battery cell terminals on the first housing wall, which has the largest outer surface area, and arranging the battery cells along the first direction (the thickness direction of the battery cells), the spacing between the terminals on the opposing first housing walls of adjacent battery cells can be small or they can be in direct contact. When the terminals are connected by connectors, the length of the connectors can be shortened, reducing space occupancy. Direct connection between terminals further saves space, thereby improving the volumetric energy density of battery devices comprising multiple battery cells arranged along the first direction. Furthermore, during the assembly of battery cells, the action path for connecting the terminals is relatively short, which helps to shorten assembly time and improve the assembly efficiency of battery devices comprising multiple battery cells.

[0107] The battery cells provided in this application embodiment can be used, but are not limited to, in battery devices. A battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0108] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0109] 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.

[0110] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0111] 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.

[0112] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0113] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0114] 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.

[0115] 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., and the embodiments of this application are not limited to this.

[0116] As an example, the battery cell can be a cylindrical battery, a prismatic battery, a pouch battery, or a battery of other shapes. Prismatic batteries include square-shell batteries, blade-shaped batteries, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0117] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0118] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a layer of positive active material disposed on at least one surface of the positive current collector.

[0119] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0120] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0121] As an example, the positive electrode active material layer may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers in batteries may also be used. These positive electrode active material layers may use only one type or a combination of two or more types. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0122] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not have a positive electrode active material layer. As an example, a positive electrode active material layer is filled and / or deposited within the foamed metal.

[0123] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0124] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0125] As an example, the negative electrode sheet may include a negative current collector and a layer of negative active material disposed on at least one surface of the negative current collector.

[0126] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0127] As an example, the negative electrode active material layer may employ a type of negative electrode active material layer known in the art for use in battery cells. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active material layers in battery cells may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0128] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material layer, although a negative electrode active material layer may or may not be present.

[0129] As an example, a layer of negative electrode active material can be filled or / and deposited inside the negative electrode current collector.

[0130] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0131] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0132] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0133] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0134] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0135] The electrode assembly can be a wound structure or a stacked structure.

[0136] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0137] In some implementations, the electrode assembly is a stacked structure.

[0138] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0139] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0140] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0141] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0142] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0143] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0144] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0145] The technical solutions described in this application are applicable to various electrical devices that use individual battery cells or battery devices, such as energy storage devices, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Energy storage devices include energy storage containers or energy storage cabinets.

[0146] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0147] Figure 1 This is a structural schematic diagram of a vehicle 1000 according to one or more embodiments.

[0148] Vehicle 1000 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 vehicles, etc. For example... Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0149] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0150] Figure 2 This is an exploded perspective view of a battery device 100 according to one or more embodiments. Figure 3 This is an exploded perspective view of a portion of the structure of a battery device 100 according to one or more embodiments.

[0151] like Figure 2 As shown, the battery device 100 includes a battery box 10 and at least one battery cell 20. The battery box 10 has a receiving space, and at least one battery cell 20 is received in the receiving space.

[0152] In some embodiments of this application, the battery box 10 may include a cover 101 and a body 102. The cover 101 and the body 102 are fastened together, forming an accommodating space inside the battery box 10 to accommodate the individual battery cells 20. This accommodating space may be sealed or unsealed.

[0153] The housing 102 can be a hollow structure with one open end, and the cover 101 can be a plate-like structure. The cover 101 closes onto the open side of the housing 102 so that the cover 101 and the housing 102 together define the receiving space. Alternatively, both the cover 101 and the housing 102 can be hollow structures with one open side, and the open side of the cover 101 closes onto the open side of the housing 102. Of course, the battery box 10 formed by the cover 101 and the housing 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0154] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of multiple battery cells 20 is placed in the receiving space formed by the housing 102 and the cover 101. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the receiving space formed by the housing 102 and the cover 101. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0155] In some embodiments, such as Figure 3 As shown, the battery cell 20 has a heat exchange component 30 on at least one side along the fastening direction of the cover 101 and the body 102. The heat exchange component 30 includes, but is not limited to, a liquid cooling plate.

[0156] Below, refer to Figures 3 to 22 Some embodiments of this application will be described in detail.

[0157] In some embodiments of this application, for ease of explanation, a first direction X, a second direction Y, and a third direction Z are defined, which intersect each other, including perpendicular intersections. For ease of explanation, as shown below... Figures 3 to 17 As shown by the arrows in the diagram, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction.

[0158] Figure 3 An exploded perspective view of a portion of the battery device structure according to one or more embodiments; Figure 4 This is a three-dimensional exploded view of a battery cell according to one or more embodiments; Figure 5 This is a three-dimensional structural diagram of a battery cell according to one or more embodiments; Figure 6 for Figure 5 A three-dimensional structural diagram of the structure from another perspective; Figure 7 This is a three-dimensional structural schematic diagram of a plurality of battery cells of a battery device according to one or more embodiments; Figure 8 A three-dimensional structural diagram of a battery cell with its outer casing removed, according to one or more embodiments; Figure 9 A cross-sectional view of a battery cell with a first structure according to one or more embodiments; Figure 10 A cross-sectional view of a battery cell of a second structure according to one or more embodiments in an assembled state; Figure 11A cross-sectional view of a battery cell and a first connector according to one or more embodiments of a third structure; Figure 12 A cross-sectional view of a battery cell and a second connector according to one or more embodiments of a fourth structure; Figure 13 for Figure 8 Enlarged view of point A in the middle; Figure 14 for Figure 10 Enlarged view of point B in the middle; Figure 15 A partial cross-sectional view of a battery cell with a fifth structure according to one or more embodiments; Figure 16 A three-dimensional structural schematic diagram of a battery cell according to a sixth structure based on one or more embodiments; Figure 17 This is a three-dimensional structural schematic diagram of a battery cell according to a sixth structure based on one or more embodiments, from another perspective. Figure 18 A process for manufacturing a battery cell according to one or more embodiments Figure 1 ; Figure 19 This is a schematic diagram of the structure obtained when multiple steps in the battery cell manufacturing process are completed using one or more embodiments of the battery cell manufacturing method; Figure 20 A process for manufacturing a battery cell according to one or more embodiments Figure 2 ; Figure 21 A process for manufacturing a battery cell according to one or more embodiments Figure 3 ; Figure 22 This is a schematic diagram of the structure obtained when multiple additional steps in the manufacturing process of a battery cell are completed using a battery cell manufacturing method according to one or more embodiments.

[0159] The first aspect of this application provides a battery cell 20, such as Figures 3 to 6 As shown, the battery cell 20 includes a housing 1, at least one electrode assembly 2, and at least two terminals 3. The housing 1 includes multiple housing walls 11, which surround to form a receiving cavity. The multiple housing walls 11 include two first housing walls 11a opposite each other along a first direction X. Among the multiple housing walls 11, the outer surface area of ​​the first housing wall 11a is the largest. The electrode assembly 2 is received in the receiving cavity. Each of the two first housing walls 11a is provided with at least one terminal 3, and the terminal 3 is connected to the tab 21 of the electrode assembly 2. The terminal 3 of the battery cell 20 is used to connect with the terminal 3 of the battery cell 20 adjacent along the first direction X.

[0160] Electrode assembly 2 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 1 may contain one or more electrode assemblies 2. Electrode assembly 2 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrode. The positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector portion and a positive current collector protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer, and at least a portion of the positive current collector protruding is not coated with the positive active material layer. The positive current collector protruding serves as a positive electrode tab 21a. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collector portion and a negative current convex portion protruding from the negative current collector portion, the negative current collector portion being coated with the negative active material layer, at least a portion of the negative current convex portion being uncoated with the negative active material layer, the negative current convex portion serving as a negative electrode tab 21b.

[0161] The outer casing 1 is a component with a cavity isolated from the external environment. This cavity houses the electrode assembly 2, the electrolyte, and other components. The outer casing 1 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as a copper-aluminum composite), or aluminum-plastic film. In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, it protects the electrode assembly 2. A sealing bag is also included between the outer casing 1 and the electrode assembly 2 to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 1 is a sealed structure, it encapsulates the electrode assembly 2 and the electrolyte, among other components. Exemplarily, the outer casing 1 can be cylindrical or prismatic. Prismatic shapes include square shells, blade shapes, and multi-faceted prisms, such as hexagonal prisms. This application does not impose any particular limitation.

[0162] It is understandable that among the multiple shell walls 11 that form the receiving cavity, the outer surface of the first shell wall 11a has the largest area, indicating that the outer surface of the first shell wall 11a is the large surface of the shell 13. The two large surfaces of the outer shell 1 are arranged opposite each other along the first direction X. It can be known that the first direction X is the direction in which the size of the battery cell 20 is the smallest, and this direction is sometimes also referred to as the thickness direction of the battery cell 20.

[0163] It is understood that each of the two first housing walls 11a facing each other along the first direction X is provided with at least one of the pole posts 3. Therefore, when multiple battery cells 20 are grouped together along the first direction X, the pole posts 3 of any two adjacent battery cells 20 along the first direction X can be connected to form an electrical connection between the two adjacent battery cells 20.

[0164] In the embodiments of this application, "multiple" means two or more.

[0165] In this embodiment, the terminal post 3 of the battery cell 20 is positioned on the first housing wall 11a, which has the largest area on the outer surface of the housing 1. Figure 7 As shown, when the battery cells 20 are arranged along the first direction X (the thickness direction of the battery cells 20), the spacing between the terminals 3 located on the first housing walls 11a facing each other of adjacent battery cells 20 can be small or they can be in direct contact. When the terminals 3 are connected by connectors (such as the first connector 91 and the second connector 92 described below), the length of the connectors can be shortened, which helps to reduce space occupation. When the terminals 3 are directly connected, space is saved, thereby helping to improve the volumetric energy density of the battery device 100 including multiple battery cells 20 arranged along the first direction X. Furthermore, during the assembly of the battery cells 20, the action path when connecting the terminals 3 is relatively short, which helps to shorten the assembly time and improve the assembly efficiency of the battery device 100 including multiple battery cells 20.

[0166] In some embodiments of this application, such as Figure 4 As shown, the outer casing 1 includes a top cover 12 and a housing 13. The housing 13 has an opening, and the top cover 12 closes the opening of the housing 13 to form a receiving cavity. The electrode assembly 2 is disposed in the receiving cavity.

[0167] It is understandable that, such as Figure 4 and Figure 5 As shown, the top cover 12 is a shell wall 11, and the shell 13 is formed by connecting multiple other shell walls 11. Two shell walls 11 of the shell 13 can serve as the first shell wall 11a.

[0168] The top cover 12 is a component that closes onto the opening of the housing 13 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 12 can be adapted to the shape of the housing 13 to fit it. Optionally, the top cover 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 12 is less prone to deformation under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. The terminal post 3 is electrically connected to the electrode assembly 2 for outputting or inputting electrical energy.

[0169] In some embodiments of this application, such as Figure 4As shown, the top cover 12 may also be provided with a pressure relief mechanism 4 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The top cover 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments of this application, an insulating component may also be provided on the inner side of the top cover 12. The insulating component can be used to isolate the electrical connection components within the housing 13 from the top cover 12 to reduce the risk of short circuits. For example, the insulating component may be plastic, rubber, etc.

[0170] The housing 13 is a component used to cooperate with the top cover 12 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 2, electrolyte, and other components. The housing 13 and the top cover 12 can be independent components. An opening can be provided on the housing 13, and the top cover 12 closes the opening to form the internal environment of the battery cell 20. The housing 13 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 13 can be determined according to the specific shape and size of the electrode assembly 2. The housing 13 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this embodiment does not impose any special limitations on these materials.

[0171] In some embodiments of this application, openings are provided at opposite ends of the housing 13, and two top covers 12 are provided, which respectively cover the two openings to isolate the internal environment of the battery cell 20 from the external environment. Both top covers 12 may be provided with pressure relief mechanisms 4, or one of the two top covers 12 may be provided with pressure relief mechanisms 4, or neither of the two top covers 12 may be provided with pressure relief mechanisms 4.

[0172] In some embodiments of this application, such as Figure 4 As shown, at least two electrode assemblies 2 are provided. The at least two electrode assemblies 2 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that at least two electrode assemblies 2 are connected in both series and parallel. The at least two electrode assemblies 2 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly consisting of the at least two electrode assemblies 2 is placed in the receiving cavity formed by the top cover 12 and the housing 13.

[0173] In some embodiments of this application, such as Figure 7 As shown, in the two first housing walls 11a of the battery cell 20, at least one terminal post 3 on one of the first housing walls 11a is a positive terminal post 3a, and at least one terminal post 3 on the other first housing wall 11a is a negative terminal post 3b.

[0174] This arrangement allows positive and negative terminals 3a and 3b to be respectively located on opposite sides of the outer casing 1 of the battery cell 20, reducing the direct contact between the positive and negative terminals 3a and 3b due to assembly errors or vibrations, thereby reducing the probability of accidental short circuits. Furthermore, this arrangement facilitates the series connection of multiple battery cells 20 along the first direction X.

[0175] In some embodiments of this application, such as Figure 7 As shown, the positive terminal 3a of the battery cell 20 is used to connect to the negative terminal 3b of the battery cell 20 adjacent along the first direction X.

[0176] It is understandable that, such as Figure 7 and Figure 8 As shown, the positive electrode post 3a is the electrode post 3 connected to the positive electrode tab 21a of the electrode assembly 2, and the negative electrode post 3b is the electrode post 3 connected to the negative electrode tab 21b of the electrode assembly 2.

[0177] For example, in the two first housing walls 11a of the battery cell 20, one first housing wall 11a is provided with a positive terminal 3a, and the other first housing wall 11a is provided with a negative terminal 3b. Multiple battery cells 20 are arranged along the first direction X, and adjacent battery cells 20 are connected in series through the connection of the positive terminal 3a and the negative terminal 3b.

[0178] For example, each of the two first housing walls 11a of the battery cell 20 is provided with a positive terminal 3a and a negative terminal 3b. Some adjacent battery cells 20 are connected in series through the connection of the positive terminal 3a and the negative terminal tab 21b, or some adjacent battery cells 20 are connected in parallel through the connection of the positive terminal 3a to the positive terminal 3a and the negative terminal 3b to the negative terminal 3b.

[0179] This allows 20 adjacent battery cells to be connected in series to increase the output voltage, meeting the needs of more high-power applications. Furthermore, the series connection method allows for flexible adjustment of the voltage level by adjusting the number of cells, reducing current loss and improving efficiency.

[0180] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, of the positive electrode post 3a and the negative electrode post 3b, one has a groove 31 recessed towards the cavity on its end face away from the cavity, and the other has a protrusion 32 protruding towards the side away from the cavity on its end face away from the cavity. The protrusion 32 of the battery cell 20 is used to cooperate and connect with the groove 31 of the battery cell 20 adjacent along the first direction X.

[0181] For example, the assembly direction of the protrusion-contact fit between adjacent battery cells 20 is the first direction X. That is, the protrusion 32 can be inserted into the groove 31 by relatively moving adjacent battery cells 20 along the first direction X. For example, the dimensions of each cross-section of the protrusion 32 are equal, and the dimensions of each cross-section of the groove 31 are equal, with the cross-section being perpendicular to the first direction X. For example, the dimensions of the cross-section of the protrusion 32 gradually decrease along the first direction X away from the receiving cavity. The dimensions of the cross-section of the groove 31 gradually decrease along the first direction X away from the receiving cavity.

[0182] For example, the positive electrode 3a and the negative electrode 3b are connected only through the engagement of the protrusion 32 and the groove 31. For example, the positive electrode 3a and the negative electrode 3b are connected through the engagement of the protrusion 32 and the groove 31, and the engagement point is welded together. For example, the positive electrode 3a and the negative electrode 3b are connected through the engagement of the protrusion 32 and the groove 31, and the engagement point is bonded together with conductive adhesive.

[0183] Thus, adjacent battery cells 20 are connected by the engagement of protrusions 32 and grooves 31, making the portion of the connection between the terminals 3 suspended between adjacent housings 1 along the first direction X relatively short, or even hidden within the adjacent housings 1. This reduces the deformation of the connection between the terminals 3 in the event of a collision involving multiple battery cells 20 arranged along the first direction X, thereby lowering the risk of short circuits. Furthermore, the engagement of protrusions 32 and grooves 31 improves the alignment accuracy of adjacent battery cells 20 along the first direction X during assembly and increases the contact area, enhancing connection stability. Additionally, the protrusion-groove connection allows for rapid insertion of battery cells 20, improving assembly efficiency.

[0184] In some embodiments of this application, such as Figure 11 As shown, the end faces of both the positive electrode post 3a and the negative electrode post 3b facing away from the receiving cavity are formed with grooves 31 that are recessed towards the receiving cavity. The groove 31 of the positive electrode post 3a of the battery cell 20 is used to connect with the groove 31 of the negative electrode post 3b of the battery cell 20 adjacent in the first direction X through the first connector 91; and / or, as Figure 12 As shown, the end faces of the positive electrode post 3a and the negative electrode post 3b facing away from the receiving cavity are both formed with protrusions 32 protruding towards the side away from the receiving cavity. The protrusion 32 of the positive electrode post 3a of the battery cell 20 is used to connect with the protrusion 32 of the negative electrode post 3b of the battery cell 20 adjacent to the first direction X through the second connector 92.

[0185] For example, such as Figure 11 As shown, the first connector 91 has a protrusion 912 for engaging with the groove 31 of the positive terminal 3a and the groove 31 of the negative terminal 3b. For example, as... Figure 12As shown, the second connector 92 has a recess 922 for engaging with the protrusion 32 of the positive terminal 3a and the protrusion 32 of the negative terminal 3b.

[0186] Thus, both the positive electrode post 3a and the negative electrode post 3b are provided with protrusions 32 and / or grooves 31. When the battery cells 20 are arranged along the first direction X, the posts 3 of adjacent battery cells 20 are indirectly connected by connectors. Since the spacing between the posts 3 located on the first housing wall 11a facing each other of adjacent battery cells 20 is small, the length of the connectors (first connector 91 and second connector 92) can be shortened, which helps to reduce the space occupied and thereby improve the volumetric energy density of the battery device 100 including multiple battery cells 20. Furthermore, when two posts 3 with grooves 31 are connected by the first connector 91, the first connector 91 will be inserted into the two grooves 31, which makes the part of the connection between the posts 3 suspended between adjacent housings 1 along the first direction X relatively short, or can be hidden in the adjacent housings 1. Therefore, when multiple battery cells 20 arranged along the first direction X are subjected to collision, the deformation of the connection between the posts 3 can be reduced, thereby reducing the risk of short circuit.

[0187] In some embodiments of this application, such as Figure 6 and Figure 8 As shown, the electrode assembly 2 includes a main body 22 and an electrode tab 21 extending from one side of the main body 22 along the second direction Y. The electrode post 3 is located at one end of the first housing wall 11a along the second direction Y, closer to the electrode tab 21. The electrode post 3 is located at the middle part of the first housing wall 11a along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other.

[0188] For example, each first housing wall 11a is provided with a pole post 3, which is located at the end of the first housing wall 11a closer to the tab 21 along the second direction Y, and at the middle part of the first housing wall 11a along the third direction Z.

[0189] This arrangement ensures that the terminal post 3 and each tab 21 are relatively close, facilitating the connection between the terminal post 3 and the tab 21, shortening the current conduction path, reducing internal resistance, and minimizing current transmission loss. Furthermore, the terminal post 3 is centered in the third direction Z, preventing it from easily protruding from the outer casing 1 along both sides of the third direction Z, thus better reducing the risk of short circuits.

[0190] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, when projected along the second direction Y, the orthographic projection of the pole post 3 overlaps with the orthographic projection of the main body 22.

[0191] Thus, the portion of the electrode post 3 located within the cavity occupies space on one side of the main body 22 along the second direction Y, resulting in a relatively small distance between the electrode assembly 2 and the first housing wall 11a. This improves the space utilization rate in the first direction X within the cavity, thereby increasing the volumetric energy density of the battery cell 20.

[0192] In some embodiments of this application, such as Figure 10 As shown, when projected along the first direction X, the orthographic projection of pole post 3 and pole tab 21 overlap.

[0193] This configuration helps to reduce the space occupied by the pole post 3 and the tab 21 in the second direction Y and the third direction Z of the cavity, thereby improving the space utilization rate in the second direction Y and the third direction Z of the cavity and thus increasing the volumetric energy density of the battery cell 20.

[0194] In some embodiments of this application, such as Figure 8 and Figure 13 As shown, the electrode assembly 2 includes a main body 22 and a tab 21 extending from one side of the main body 22 along the second direction Y. The electrode post 3 is disposed on the end of the first housing wall 11a that is closer to the tab 21 along the second direction Y. The first direction X intersects the second direction Y. The battery cell 20 also includes an adapter 5. The electrode post 3 is connected to the tab 21 of the electrode assembly 2 through the adapter 5.

[0195] The terminal post 3 is located at the end of the first housing wall 11a closer to the tab 21 along the second direction Y. This allows the terminal post 3 to be closer to the tab 21, which helps to shorten the length of the adapter 5, reduce the occupancy of the housing cavity, and improve the volumetric energy density. Furthermore, the adapter 5 can be flexibly designed with a suitable shape according to the relative position of the tab 21 and the terminal post 3, facilitating the electrical connection between the tab 21 and the terminal post 3. Additionally, during cyclic expansion / contraction of the battery cell 20, relative displacement occurs between the electrode assembly 2 and the housing 1. The adapter 5, which indirectly connects the tab 21 and the terminal post 3, can absorb this displacement to some extent, reducing the relative displacement between the tab 21 and the terminal post 3 and lowering the risk of the tab 21 tearing or the terminal post 3 loosening.

[0196] In some embodiments of this application, such as Figure 8 and Figure 13As shown, the electrode assembly 2 includes a main body 22 and a tab 21 extending from one side of the main body 22 along the second direction Y. The electrode post 3 is disposed on the end of the first housing wall 11a closer to the tab 21 along the second direction Y. The first direction X intersects the second direction Y. The tab 21 includes an extension 211 extending from the main body 22 and a connecting portion 212 connected to the extension 211. At least a portion of the connecting portion 212 extends along the first direction X. The battery cell 20 also includes an adapter 5, which is connected to the surface of the connecting portion 212 facing away from the main body 22 and connected to the electrode post 3.

[0197] It should be noted that the tab 21 can be a single layer, that is, a single protrusion (positive or negative protrusion) of the current collector (positive or negative current collector) of the electrode (positive or negative electrode) serves as the tab 21, and both the protruding portion 211 and the connecting portion 212 of the tab 21 are single layers. The tab 21 can also be multi-layered, that is, multiple protrusions of the current collector of the electrode are stacked sequentially to form the tab 21. In this case, the gradually converging part of the multiple protrusions forms the protruding portion 211 (sometimes also called the converging part), and the remaining parts of the multiple protrusions are stacked to form a part of uniform thickness as the connecting portion 212.

[0198] The electrode tab 21 includes an extension 211 extending from the main body 22 and a connecting portion 212 connected to the extension 211. At least a portion of the connecting portion 212 extends along a first direction X, thereby reducing the space occupied by the electrode tab 21 in the second direction Y. Furthermore, the adapter 5 is connected to the surface of the connecting portion 212 facing away from the main body 22, which helps to increase the connection area between the electrode tab 21 and the adapter 5 and improve the connection strength between them.

[0199] In some embodiments of this application, such as Figure 13 As shown, the connecting portion 212 includes a boss portion 2121 and a recessed portion 2122. The boss portion 2121 is connected to the protruding portion 211 and the recessed portion 2122 on opposite sides along the first direction X, respectively. The recessed portion 2122 is recessed relative to the side of the boss portion 2121 facing the main body portion 22, and the surface of the recessed portion 2122 facing away from the main body portion 22 is connected to the adapter 5.

[0200] For example, the maximum size of the recessed portion 2122 recessed relative to the boss portion 2121 along the second direction Y is not less than the thickness of the portion of the adapter 5 connected to the recessed portion 2122, such that the distance between the surface of the adapter 5 facing away from the main body portion 22 and the main body portion 22 is not greater than the distance between the surface of the boss portion 2121 facing away from the main body portion 22 and the main body portion 22, that is, the adapter 5 does not extend beyond the boss portion 2121 from the side facing away from the main body portion 22.

[0201] For example, the maximum size of the recessed portion 2122 recessed relative to the boss portion 2121 along the second direction Y is smaller than the thickness of the portion of the adapter 5 connected to the recessed portion 2122, such that the distance between the surface of the adapter 5 facing away from the main body portion 22 and the main body portion 22 is greater than the distance between the surface of the boss portion 2121 facing away from the main body portion 22 and the main body portion 22. That is, a portion of the adapter 5 extends beyond the boss portion 2121 from the side facing away from the main body portion 22.

[0202] Thus, by connecting the recessed portion 2122 with the adapter 5, the space occupied by the adapter 5 and the tab 21 along the second direction Y can be reduced, further improving the space utilization of the cavity and thereby increasing the volumetric energy density of the battery cell 20.

[0203] In some embodiments of this application, such as Figure 14 As shown, the adapter 5 includes a first part 51 and a second part 52. The first part 51 extends along a first direction X, and the second part 52 extends along a second direction Y. The first part 51 and the second part 52 intersect and are connected. The second part 52 extends relative to the first part 51 toward the side close to the main body 22 and / or away from the main body 22. The first part 51 is connected to the recessed part 2122, and the second part 52 is connected to the pole post 3.

[0204] For example, the surface of the second part 52 facing away from the first part 51 along the first direction X is connected to the pole post 3.

[0205] For example, the second part 52 extends relative to the first part 51 toward the side away from the main body part 22.

[0206] For example, such as Figure 14 As shown, the second part 52 extends toward the side closer to the main body 22 relative to the first part 51. In this way, the second part 52 and the tab 21 share the space in the first direction X, which helps to reduce the space occupied by the tab 21 and the adapter 5 in the second direction Y and the third direction Z, thereby increasing the volumetric energy density of the battery cell 20.

[0207] For example, a portion of the second part 52 extends relative to the first part 51 toward the side away from the main body 22, and another portion extends relative to the first part 51 toward the side closer to the main body 22.

[0208] The first part 51 extends along the first direction X, and a portion of the first part 51 is connected to the surface of the recessed portion 2122 facing away from the main body portion 22. In this way, the space occupied by the adapter 5 in the second direction Y is reduced. Furthermore, the second part 52 extends along the second direction Y, which can increase the connection area between the second part 52 and the pole post 3, thereby improving the connection strength and reliability between the pole post 3 and the adapter 5.

[0209] In some embodiments of this application, such as Figure 15As shown, the electrode assembly 2 includes a main body 22 and a tab 21 extending from one side of the main body 22 along the second direction Y. The electrode post 3 is disposed at one end of the first housing wall 11a along the second direction Y, closer to the tab 21. The first direction X intersects the second direction Y. The tab 21 includes an extension 211 extending from the main body 22 and retracting, and a connecting portion 212 connected to the extension 211. At least a portion of the connecting portion 212 extends along the second direction Y. The battery cell 20 also includes an adapter 5, which is connected to the surface of the connecting portion 212 facing the first housing wall 11a and connected to the electrode post 3.

[0210] For example, such as Figure 15 As shown, the connecting portion 212 is folded in half from its middle to form two interconnected portions that overlap along the first direction X, both of which extend along the second direction Y.

[0211] This configuration helps to increase the connection area between the connecting part 212 of the electrode 21 and the adapter 5, improve the connection strength and reliability between the electrode 21 and the adapter 5, increase the current flow area, and reduce current resistance.

[0212] In some embodiments of this application, such as Figure 15 As shown, the adapter 5 includes a third part 53, a fourth part 54 and a fifth part 55. The third part 53 and the fifth part 55 both extend along the second direction Y. The fourth part 54 extends along a direction that intersects with the second direction Y and connects between the third part 53 and the fifth part 55. Along the first direction X, the third part 53 is closer to the connecting part 212 than the fifth part 55. The third part 53 and the fifth part 55 are respectively connected to the mutually oriented surfaces of the connecting part 212 and the pole post 3.

[0213] For example, such as Figure 15 As shown, the third part 53 is closer to the main body 22 in the second direction Y than the fifth part 55. The surface of the third part 53 facing away from the first housing wall 11a is connected to the surface of the connecting part 212 facing the first housing wall 11a. The surface of the fifth part 55 facing the first housing wall 11a is connected to the end face of the pole post 3.

[0214] This configuration helps to increase the connection area between the adapter 5 and the pole 3, as well as the connection area between the adapter 5 and the connecting part 212 of the tab 21, thereby improving the connection strength and reliability of the adapter 5 connecting the pole 3 and the tab 21, increasing the current flow area, and reducing current resistance.

[0215] In some embodiments of this application, such as Figure 16 and Figure 17As shown, one first housing wall 11a is provided with two positive terminals 3a, which are respectively located at opposite ends of the first housing wall 11a along the second direction Y. The other first housing wall 11a is provided with two negative terminals 3b, which are respectively located at opposite ends of the first housing wall 11a along the second direction Y.

[0216] For example, of the positive electrode post 3a and the negative electrode post 3b, one has a groove 31 and the other has a protrusion 32.

[0217] In some embodiments of this application, such as Figure 9 As shown, the first housing wall 11a has a pole mounting hole 111 extending along the first direction X. The pole 3 passes through the pole mounting hole 111. A portion of the pole 3 extends into the receiving cavity and is connected to the pole tab 21, while the other portion extends along the first direction X toward the side opposite to the receiving cavity and extends beyond the outer surface of the first housing wall 11a.

[0218] Thus, by extending a portion of the terminal post 3 outside the outer casing 1, the connection operation between the terminal posts 3 is facilitated during the assembly of the battery cells 20, enhancing connection reliability. Furthermore, it helps reduce the space occupied by the terminal post 3 within the housing cavity, thereby increasing the energy density of the battery cells 20. Additionally, it improves the sealing effect between the terminal post 3 and the casing 1, reducing the risk of electrolyte leakage.

[0219] In some embodiments of this application, such as Figure 9 As shown, the battery cell 20 also includes an insulating structure 6, which is disposed between the terminal post 3 and the first housing wall 11a.

[0220] For example, part of the insulating structure 6 is sandwiched between the outer peripheral surface of the pole post 3 and the hole wall of the pole post mounting hole 111, another part is sandwiched between the surface of the first housing wall 11a facing away from the receiving cavity and the pole post 3, and yet another part is sandwiched between the surface of the first housing wall 11a facing the receiving cavity and the pole post 3.

[0221] Thus, the insulation structure 6 provides insulation between the electrode post 3 and the first housing wall 11a, reducing the risk of short circuits. Furthermore, the insulation structure 6 also acts as a seal, improving the sealing performance at the electrode post 3 mounting point and reducing the risk of electrolyte leakage.

[0222] In some embodiments of this application, the electrode assembly 2 is a wound structure or a stacked structure.

[0223] The wound electrode assembly 2 has lower manufacturing costs, a simpler manufacturing process, and higher manufacturing efficiency, making it suitable for mass production. The stacked electrode assembly 2 offers better safety and stability; its layered structure reduces the risk of internal short circuits in the battery cell 20, thus mitigating safety hazards.

[0224] In some embodiments of this application, such as Figure 8 As shown, there are at least two electrode assemblies 2, which are arranged along the first direction X, and adjacent electrode assemblies 2 are connected in series or in parallel.

[0225] For example, such as Figure 8 As shown, at least two positive electrode tabs 21a of electrode assemblies 2 arranged along the first direction X are connected to the same positive electrode adapter, and the positive electrode adapter is connected to a positive electrode post 3a disposed on one first housing wall 11a. At least two negative electrode tabs 21b of electrode assemblies 2 arranged along the first direction X are connected to the same negative electrode adapter, and the negative electrode adapter is connected to a negative electrode post 3b disposed on another first housing wall 11a. It is understood that the positive electrode adapter and the negative electrode adapter belong to the aforementioned adapter 5.

[0226] In this way, electrical connection between electrode components 2 is achieved, increasing the capacity of battery cell 20.

[0227] A second aspect of this application provides a battery device 100, such as... Figure 3 As shown, the battery device 100 includes a plurality of battery cells 20 provided in the first aspect. The plurality of battery cells 20 are arranged along the first direction X, and any two adjacent battery cells 20 are connected by terminals 3 facing each other.

[0228] Since the battery device 100 includes a plurality of battery cells 20 provided on a first side arranged along a first direction X, the battery device 100 has a high volumetric energy density.

[0229] In some embodiments of this application, such as Figure 7 As shown, in any two first housing walls 11a facing each other in any adjacent battery cell 20, at least one pole post 3 provided in one first housing wall 11a is provided with a protrusion 32, and at least one pole post 3 provided in the other first housing wall 11a is provided with a groove 31, and the protrusion 32 and the groove 31 are connected in a cooperative manner.

[0230] For example, the protrusion 32 and the groove 31 are connected and bonded by conductive adhesive.

[0231] For example, the protrusion 32 and the groove 31 are fitted together and welded together. The welding of the protrusion 32 and the groove 31 on the basis of the fitted connection further improves the connection reliability between adjacent battery cells 20.

[0232] Thus, adjacent battery cells 20 are connected by the engagement of protrusions 32 and grooves 31, making the portion of the connection between the terminals 3 suspended between adjacent housings 1 along the first direction X relatively short, or even hidden within the adjacent housings 1. This reduces the deformation of the connection between the terminals 3 in the event of a collision involving multiple battery cells 20 arranged along the first direction X, thereby lowering the risk of short circuits. Furthermore, the engagement of protrusions 32 and grooves 31 improves the alignment accuracy of adjacent battery cells 20 along the first direction X during assembly and increases the contact area, enhancing connection stability. Additionally, the protrusion-groove fit allows for rapid insertion of the battery cells 20, improving assembly efficiency.

[0233] For example, at least some of the adjacent battery cells 20 are connected in series.

[0234] For example, at least some of the adjacent battery cells 20 are connected in parallel.

[0235] In some embodiments of this application, such as Figure 11 As shown, in any two first housing walls 11a facing each other in any adjacent battery cell 20, at least one terminal post 3 in each first housing wall 11a is provided with a groove 31. The battery device 100 also includes a first connector 91, a part of which is inserted into the groove 31 of one terminal post 3 and the other part is inserted into the groove 31 of the other terminal post 3.

[0236] Thus, the terminals 3 of adjacent battery cells 20 are connected by the first connector 91. Furthermore, a portion of the first connector 91 mates with the groove 31 of the terminal 3, improving the alignment accuracy of the terminal 3, increasing production yield, and enhancing connection strength. Moreover, the insertion of the first connector 91 into two grooves 31 allows the portion of the connection between the terminals 3 suspended between adjacent housings 1 along the first direction X to be relatively short, or to be hidden within adjacent housings 1. This reduces the deformation of the connection between the terminals 3 in the event of a collision involving multiple battery cells 20 arranged along the first direction X, thereby lowering the risk of short circuits.

[0237] In some embodiments of this application, such as Figure 11 As shown, the first connector 91 includes a first body portion 911 and two protrusions 912 that protrude from opposite sides of the first body portion 911. The two protrusions 912 of the first connector 91 respectively fit into the grooves 31 of the two pole posts 3. The first body portion 911 is located between the end faces of the two pole posts 3.

[0238] The first body part 911 is clamped between the two pole posts 3, forming a mechanical locking effect, which effectively suppresses stress deformation during the charging and discharging process.

[0239] In some embodiments of this application, such as Figure 11 As shown, an elastic conductive element 7 is sandwiched between the outer peripheral surface of the protrusion 912 and the groove wall of the groove 31; and / or, a conductive adhesive layer is bonded between the outer peripheral surface of the protrusion 912 and the groove wall of the groove 31.

[0240] For example, the conductive adhesive layer is made of conductive adhesive.

[0241] For example, the elastic conductive element 7 includes, but is not limited to, metal springs, metal sheets, etc.

[0242] The elastic conductive element 7 is clamped between the outer peripheral surface of the protrusion 912 and the groove wall of the groove 31, thereby improving the connection strength between the protrusion 912 and the groove 31. A conductive adhesive layer is provided between the outer peripheral surface of the protrusion 912 and the groove wall of the groove 31 to improve the connection strength between the protrusion 912 and the groove 31, thereby improving the connection reliability between adjacent battery cells 20.

[0243] In some embodiments of this application, such as Figure 12 As shown, in any two first housing walls 11a facing each other in any adjacent battery cell 20, at least one terminal post 3 in each first housing wall 11a is provided with a protrusion 32. The battery device 100 also includes a second connector 92, which includes a second body portion 921. Recesses 922 are formed on both opposite sides of the second body portion 921. The recesses 922 on both sides of the second connector 92 respectively cooperate with the protrusions 32 of the two terminal posts 3.

[0244] Thus, the terminals 3 of adjacent battery cells 20 are connected by a first connector 91. Furthermore, the recessed portion 922 of the first connector 91 engages with the protrusion 32 of the terminal 3, improving the alignment accuracy of the terminal 3, increasing production yield, and enhancing connection strength. The second body portion 921 is clamped between the two terminals 3, forming a mechanical locking effect, effectively suppressing stress deformation during charging and discharging.

[0245] In some embodiments of this application, such as Figure 10 As shown, a sheet 8 is sandwiched between adjacent battery cells 20. The sheet 8 has a clearance hole that extends through the first direction X. The connected electrode post 3 passes through the clearance hole. The sheet 8 includes at least one of a heat insulation pad, a heat exchange element, and a buffer pad.

[0246] In this way, the pole post 3 can be further shielded, making it less susceptible to collisions with external objects. The pole post 3 has high structural stability, thereby reducing the risk of short circuits. Moreover, the pole post 3 occupies little space in the first direction X, further increasing the volumetric energy density.

[0247] In some embodiments of this application, the battery device 100 further includes a battery box 10, which includes a box body 102 and a box cover 101 covering the box body. A receiving space is formed between the box body 102 and the box cover 101, and a plurality of battery cells 20 are received in the receiving space. The arrangement direction of the box body 102 and the box cover 101 is perpendicular to or consistent with the first direction X.

[0248] Thus, because the terminals 3 connecting adjacent battery cells 20 are shielded by the adjacent outer casing 1, the terminals 3 are less likely to be impacted by external forces from the first X direction. Therefore, the battery cells 20 can be placed upright or lying flat in the battery box 10, both of which can reduce the damage to the terminals 3. The terminals 3 have high structural stability, thereby reducing the risk of short circuit.

[0249] A third aspect of this application provides an electrical device including a battery device 100 provided in the second aspect, the battery device 100 being used to store or provide electrical energy.

[0250] Because the battery device 100 provided in the second aspect has a high volumetric energy density, the power supply device also has a high volumetric energy density.

[0251] The fourth aspect of this application provides a method for manufacturing a battery cell 20, such as... Figure 18 As shown, the manufacturing method includes:

[0252] S100: Make the side panels.

[0253] The side panel includes two first shell walls 11a opposite each other along the first direction X. The side panel has an inner cavity with a first opening 141 and a second opening 142 respectively at both ends along the second direction Y. The first direction X and the second direction Y intersect.

[0254] S200: At least one pole post is installed on each of the two first housing walls.

[0255] The pole is closer to the first opening than the second opening, and the end of the pole facing the inner cavity extends beyond the inner surface of the first housing wall.

[0256] S300: Provides a base plate, a top cover, and at least one electrode assembly.

[0257] S400: Insert the electrode assembly into the inner cavity through the second opening.

[0258] S500: Electrically connects the tabs of the electrode assembly to the electrode post.

[0259] S600: Seal the second opening in the base plate.

[0260] S700: Seal the first opening with the top cover.

[0261] Among them, such as Figure 19 As shown, the side panel 131, the bottom plate 132, and the top cover form the outer shell 1. Among all the shell walls 11 of the outer shell 1, the outer surface of the first shell wall 11a has the largest area.

[0262] It is understood that the side panel 131 is a continuous surrounding plate around the electrode assembly 2, and can be, but is not limited to, a square cylindrical structure with a rectangular cross-section. The side panel 131 is formed by at least four shell walls 11 connected end to end in sequence, of which two opposing shell walls 11 are the first shell walls 11a.

[0263] In some embodiments, the base plate 132 and the side panels 131 constitute the housing 13.

[0264] It should be noted that the side panel 131, the bottom plate 132 and the top cover 12 form a receiving cavity.

[0265] By first inserting the electrode assembly 2 through the second opening 142 and then installing the base plate 132, the step of having the main body 22 of the electrode assembly 2 enter the inner cavity through the first opening 141 can be eliminated. This reduces the possibility of the electrode assembly 2 colliding with the terminal post 3 during the insertion process, allowing the manufacturing steps of the battery cell 20 to proceed smoothly and improving the manufacturing yield of the battery cell 20. Furthermore, the battery cell 20 produced by this method has high volumetric energy density and low short-circuit risk.

[0266] In some embodiments of this application, such as Figure 19 As shown in Figure (e), in the battery cell 20 manufactured by this manufacturing method, the electrode assembly 2 includes a main body 22 and a tab 21 extending from one end of the main body 22 along the second direction Y. The electrode post 3 is disposed at one end of the first housing wall 11a near the first opening 141. When projected along the second direction Y, the orthographic projection of the electrode post 3 overlaps with the orthographic projection of the main body 22 of the electrode assembly 2.

[0267] This design makes the dimensions of the electrode assembly 2 along the first direction X less susceptible to the influence of the position of the electrode post 3, allowing the electrode assembly 2 to be set relatively large, thereby resulting in a high volumetric energy density of the battery cell 20. Furthermore, this structure necessitates the insertion of the electrode assembly 2 through the second opening 142 to reduce the possibility of interference between the electrode assembly 2 and the electrode post 3 during the insertion process.

[0268] In some embodiments of this application, such as Figure 20 As shown, before step S400: inserting the electrode assembly 2 into the inner cavity through the second opening 142, the method for manufacturing the battery cell 20 further includes:

[0269] S301: Adapter provided;

[0270] S302: Connect the adapter to the tab of the electrode assembly;

[0271] Step S500: Electrically connecting the tabs of the electrode assembly to the electrode post includes:

[0272] S501: Connect the adapter to the pole.

[0273] Thus, by using the adapter 5 to connect the pole post 3 to the tab 21 of the electrode assembly 2, the electrical connection between the pole post 3 and the electrode assembly 2 is achieved.

[0274] For example, electrode assembly 2 has two. Figure 21 As shown, step S302 includes:

[0275] S3021: Place the two electrode assemblies with their tabs facing each other;

[0276] S3022: Connect adapters between the positive tabs and between the negative tabs of the two electrode assemblies;

[0277] S3023: Flip the two electrode assemblies toward the same side of the adapter so that the two electrode assemblies are arranged in the same direction along their thickness.

[0278] For example, the angle at which the two electrode assemblies 2 are flipped toward the same side of the adapter 5 can be, but is not limited to, 90°.

[0279] Specifically, such as Figure 22 Figures (a) to (c) illustrate multiple states during the process from the state where the two electrode assemblies 2 are not connected to the adapter 5 to the state where the adapter 5 is connected and the position is adjusted. Figures (a) and (b) both show the front view and the top view. For example, in Figure (a), the upper view shows the front view of the two electrode assemblies 2, and the lower view shows the top view of the two electrode assemblies 2. Figure (a) shows the orientation of the two electrode assemblies 2 in step S3021, with the tabs 21 facing each other. Figure (b) shows the schematic diagram after the two electrode assemblies 2 are connected to the adapter 5 in step S3022, with the adapter 5 connected between the positive tabs 21a and the negative tabs 21b of the two electrode assemblies 2. Figure (c) shows the structural schematic diagram formed after the structure in Figure (b) is flipped in step S3023, at which point the two electrode assemblies 2 are arranged along the thickness direction.

[0280] Understandable, Figure 22 Figure (c) in the middle is Figure 19 Figure (a) in the figure.

[0281] For example, see Figure 19 , Figure 19Figures (a) to (e) illustrate the various states in the process from the completion of the connection of the two electrode components 2 to the formation of the battery cell 20. Figure 19 The structure in Figure (a) is wrapped with an insulating film (e.g., Mylar film) and the bottom support is installed to form the structure shown in Figure (b). The structure in Figure (b) is inserted into the inner cavity through the second opening 142 of the side panel 131 (step S400), and the adapter is welded to the pole (step S501) to form the structure shown in Figure (c). The bottom plate 132 is welded at the second opening 142 of the structure in Figure (c) (step S600) to form the structure in Figure (d). The top cover is welded at the first opening 141 of the structure in Figure (d) (step S700) to form the structure in Figure (e).

[0282] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0283] As a specific example, a battery cell (cell 20) is provided. The outer surface (first housing wall 11a) of the outer casing 1 of the battery cell has a terminal post 3. The outer end of the terminal post 3 on one large surface has a protruding structure (protrusion 32), and the outer end face of the terminal post 3 on the other large surface has a concave structure (groove 31). The protruding structures and concave structures of two adjacent battery cells are connected by plug-in or tenon joint, which can eliminate the need for welding and eliminate the need for the use of a tab connection method, so that the terminal post 3 is shielded from both sides by the adjacent outer casing 1.

[0284] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 all should be covered within the scope of the 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.

Claims

1. A battery device, characterized by, The battery device comprises a plurality of battery cells which are arranged along a first direction, and each of the battery cells comprises: a housing comprising a plurality of housing walls which surround a receiving cavity, the plurality of housing walls comprising two first housing walls which are opposite to each other along the first direction, and among the plurality of housing walls, the first housing walls have the largest area of outer surfaces; at least one electrode assembly which is received in the receiving cavity, the electrode assembly comprising a main body and a tab which extends from one side of the main body along a second direction, the first direction intersecting the second direction; at least two pole posts, each of the two first housing walls being provided with at least one pole post, the pole post being arranged at an end of the first housing wall which is closer to the tab along the second direction; an adapter which is received in the receiving cavity, the pole post being connected to the tab through the adapter; wherein any two adjacent battery cells are connected through the pole posts which face each other; among the two first housing walls of the battery cell, the at least one pole post arranged at one of the first housing walls is a positive pole post, and the at least one pole post arranged at the other of the first housing walls is a negative pole post; among the positive pole post and the negative pole post, an end surface of one of the positive pole post and the negative pole post which faces away from the receiving cavity is formed with a groove which is recessed towards the receiving cavity, and an end surface of the other of the positive pole post and the negative pole post which faces away from the receiving cavity is formed with a protrusion which is protruded towards a side which faces away from the receiving cavity; the battery device comprises a first connector, a part of the first connector is inserted into the groove of the pole post of one of the two adjacent battery cells, and another part of the first connector is inserted into the groove of the pole post of the other of the two adjacent battery cells; and / or the battery device comprises a second connector, the second connector comprises a second body, recessed portions are formed at opposite sides of the second body, and the recessed portions at the two sides of the second connector are respectively fitted into the protrusions of the pole posts of the two adjacent battery cells.

2. The battery device according to claim 1, characterized by the positive pole post of the battery cell is used to be connected to the negative pole post of another battery cell which is adjacent to the battery cell along the first direction.

3. The battery device according to claim 1 or 2, characterized by the electrode assembly comprises a main body and a tab which extends from one side of the main body along a second direction, the pole post is arranged at an end of the first housing wall which is closer to the tab along the second direction, and the pole post is arranged at a middle part of the first housing wall along a third direction, the first direction, the second direction and the third direction intersecting each other.

4. The battery device of claim 3, wherein in projection along the second direction, the pole post has an overlapping part with the main body in orthographic projection.

5. The battery device of claim 3, wherein in projection along the first direction, the pole post has an overlapping part with the tab in orthographic projection.

6. The battery device according to claim 1 or 2, wherein the tab comprises an extending portion which extends from the main body and a connecting portion which is connected to the extending portion, at least a part of the connecting portion extends along the first direction, the adapter is connected to a surface of the connecting portion which faces away from the main body, and the adapter is connected to the pole post.

7. The battery device of claim 6, wherein The connecting portion includes a convex portion and a concave portion, the convex portion is connected with the extending portion and the concave portion respectively along opposite sides of the first direction, the concave portion is recessed relative to the convex portion towards one side of the main body portion, and a surface of the concave portion away from the main body portion is connected with the adapter.

8. The battery device of claim 7, wherein, The adapter includes a first portion and a second portion connected with each other, the first portion extends along the first direction, the second portion extends along the second direction, the first portion is connected with the concave portion, and the second portion is connected with the pole.

9. The battery device according to claim 1 or 2, wherein The tab includes an extending portion extending from the main body portion and a connecting portion connected with the extending portion, at least part of the connecting portion extends along the second direction, a surface of the connecting portion facing the first housing wall is connected with the adapter, and the adapter is connected with the pole.

10. The battery device of claim 9, wherein, The adapter includes a third portion, a fourth portion and a fifth portion, the third portion and the fifth portion both extend along the second direction, the fourth portion extends along a direction intersecting with the second direction and is connected between the third portion and the fifth portion, along the first direction, the third portion is closer to the connecting portion relative to the fifth portion, and the third portion and the fifth portion are connected with mutually facing surfaces of the connecting portion and the pole respectively.

11. The battery device according to any one of claims 1, 2, 7, 8, and 10, characterized by, The first housing wall is formed with a pole mounting hole extending along the first direction, the pole passes through the pole mounting hole, part of the pole extends into the accommodating cavity and is connected with the tab, and another part of the pole extends along the first direction away from the accommodating cavity and beyond an outer surface of the first housing wall, The battery monomer further includes an insulation structure arranged between the pole and the first housing wall.

12. The battery device according to any one of claims 1, 2, 7, 8, and 10, characterized by, The electrode assembly is in a winding structure or a stacking structure.

13. The battery device according to any one of claims 1, 2, 7, 8, and 10, characterized by, Among two mutually facing first housing walls of any adjacent battery monomers, at least one pole arranged on one of the first housing walls is provided with a protrusion, and at least one pole arranged on the other of the first housing walls is provided with a groove, and the protrusion is connected with the groove in a matching manner.

14. The battery device according to any one of claims 1, 2, 7, 8, and 10, wherein, Among two mutually facing first housing walls of any adjacent battery monomers, at least one pole arranged on each of the first housing walls is provided with a groove.

15. The battery device of claim 14, wherein, The first connecting member includes a first body portion and two protruding portions protruding from opposite sides of the first body portion respectively, the two protruding portions of the first connecting member are matched with the grooves of the two poles respectively, and the first body portion is arranged between end surfaces of the two poles.

16. The battery device of claim 15, wherein, An elastic conductive member is arranged between an outer peripheral surface of the protruding portion and a groove wall of the groove; and / or An electrically conductive adhesive layer is adhered between the outer peripheral surface of the protruding portion and the groove wall of the groove.

17. The battery device according to any one of claims 1, 2, 7, 8, 10, 15 and 16, characterized by, Among two mutually facing first housing walls of any adjacent battery monomers, at least one pole arranged on each of the first housing walls is provided with a protrusion.

18. The battery device of claim 13, wherein, A sheet is arranged between adjacent battery cells, the sheet is provided with a through hole along the first direction, the connected pole post passes through the through hole, and the sheet comprises at least one of a heat insulation pad, a heat exchange member and a buffer pad.

19. The battery device of any one of claims 1, 2, 7, 8, 10, 15, 16, and 18, wherein, The battery device further comprises a battery box, the battery box comprises a box body and a box cover covering the box body, a containing space is formed between the box body and the box cover, and a plurality of battery cells are contained in the containing space; the arrangement direction of the box body and the box cover is perpendicular to or consistent with the first direction.

20. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1 to 19, and is used for storing or providing electric energy.

21. A method of manufacturing a battery device, characterized by The battery device comprises: manufacturing a side wall, the side wall comprises two first shell walls opposite to each other along a first direction, and has an inner cavity with a first opening and a second opening at two ends along a second direction, the first direction and the second direction intersect with each other; at least one pole post is arranged on each of the two first shell walls, the pole post is closer to the first opening relative to the second opening, and an end of the pole post facing the inner cavity exceeds the inner surface of the first shell wall; a bottom plate, a top cover, an adapter and at least one electrode assembly are provided; the adapter is connected to the tab of the electrode assembly; the electrode assembly is put into the inner cavity from the second opening; the adapter is connected to the pole post; the bottom plate closes the second opening; the top cover closes the first opening, and a battery cell is manufactured; wherein the side wall, the bottom plate and the top cover form an outer shell and an accommodating cavity, among all shell walls of the outer shell, the outer surface of the first shell wall has the largest area; a plurality of battery cells are arranged along the first direction; the pole posts of adjacent battery cells are connected by a connecting member, the battery device comprises a plurality of battery cells with the same structure, among the two first shell walls of the battery cell, at least one pole post arranged on one of the first shell walls is a positive pole post, and at least one pole post arranged on the other first shell wall is a negative pole post; among the positive pole post and the negative pole post, an end surface of one away from the accommodating cavity is provided with a groove recessed towards the accommodating cavity, and an end surface of the other away from the accommodating cavity is provided with a protrusion protruding towards a side away from the accommodating cavity, the protrusion of the pole post of one of the two adjacent battery cells is matched with the groove of the pole post of the other battery cell; and the connecting member comprises a first connecting member, a part of the first connecting member is inserted into the groove of the pole post of one of the two adjacent battery cells, and the other part is inserted into the groove of the pole post of the other battery cell; and / or The connecting piece comprises a second connecting piece, the second connecting piece comprises a second body part, recesses are formed on opposite sides of the second body part, and the recesses on the two sides of the second connecting piece are respectively matched with the protrusions of the pole columns of two adjacent battery monomers.

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