A battery cell, a battery, and an electric device

Abstract

The application discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a flexible shell, a containing space, an electrode assembly and a connecting piece. The electrode assembly is contained in the containing space. The connecting piece comprises a first connecting area and a second connecting area. The first connecting area is used for connecting with components other than the battery monomer. The second connecting area is used for connecting with the electrode assembly. The connecting piece further comprises a bonding area used for bonding with the flexible shell to seal the containing space. In the thickness direction of the connecting piece, at least two of the first connecting area, the second connecting area and the bonding area at least partially overlap. The technical scheme of the application can reduce the length of the connecting piece, increase the relative length of the electrode assembly, improve the space utilization in the battery and improve the energy density of the battery.

Description

Technical Field

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

[0002] With increasing environmental pollution, the new energy industry is attracting more and more attention. Within the new energy industry, battery technology is a crucial factor in its development.

[0003] In the development of battery technology, how to improve battery performance is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device. By designing the connector structure, the length of the connector can be reduced and the relative length of the electrode assembly can be increased, thereby improving the internal space utilization of the battery and increasing the energy density of the battery.

[0005] In a first aspect, a battery cell is provided, comprising: a flexible housing including a receiving space; an electrode assembly received within the receiving space; and a connector including a first connecting region and a second connecting region, the first connecting region being for connecting to a component other than the battery cell, the second connecting region being for connecting to the electrode assembly, and the connector further including an adhesive region for bonding to the flexible housing to seal the receiving space; projected along the thickness direction of the connector, at least two of the first connecting region, the second connecting region, and the adhesive region at least partially overlap.

[0006] In this embodiment, the battery cell includes a flexible shell with a receiving space, an electrode assembly housed within the receiving space, and a connector connecting components other than the battery cell and the electrode assembly. By projecting the connector along its thickness direction, the first connection area, the second connection area, and the adhesive area on the connector are configured such that at least two of them partially overlap. Compared to a connector where the first connection area, the second connection area, and the adhesive area do not overlap, the length of the connector can be effectively reduced while the length of the electrode assembly can be increased for the same battery cell length, thereby improving the internal space utilization of the battery and increasing the energy density of the battery.

[0007] In one possible implementation, the connector includes a first surface and a second surface disposed opposite to each other along the thickness direction of the connector, wherein at least two of the first connecting region, the second connecting region and the adhesive region are located on the first surface and the second surface, respectively.

[0008] In this embodiment, at least two of the first connecting area, the second connecting area, and the adhesive area are located on the first and second surfaces of the connector that are opposite each other along the thickness direction. That is, at least two of the first connecting area, the second connecting area, and the adhesive area have overlapping projections along the thickness direction of the connector, which can effectively reduce the length of the connector.

[0009] In one possible implementation, when projected along the thickness direction of the connector, the first connection region and the second connection region at least partially overlap.

[0010] In this embodiment, the first connection region is connected to components other than the battery cell, and the second connection region is connected to the electrode assembly. Projected along the thickness direction of the connector, the first and second connection regions at least partially overlap, which reduces the total length of the first and second connection regions on the connector, thereby reducing the length of the connector and increasing the relative length of the electrode assembly.

[0011] In one possible implementation, the first connection region and the second connection region are respectively disposed on the first surface and the second surface.

[0012] In this embodiment, the first surface and the second surface are two opposing surfaces of the connector. The first connecting area and the second connecting area are respectively disposed on two opposing surfaces, meaning that the first connecting area and the second connecting area overlap in the thickness direction of the connector. This significantly reduces the length of the connector, and the edge of the second connecting area located on the second surface can extend to the edge of the second surface, which is beneficial for improving the flow capacity of the connector.

[0013] In one possible implementation, the bonding area includes a first bonding area and a second bonding area, the first bonding area being located on the first surface, and at least a portion of the first bonding area being located on the side of the first connection area closer to the electrode assembly; the second bonding area being located on the second surface, and at least a portion of the second bonding area being located on the side of the second connection area away from the electrode assembly.

[0014] In this embodiment, the bonding area includes a first bonding area and a second bonding area disposed on two different surfaces. The first bonding area on the first surface is at least partially located on the side of the first connection area closer to the electrode assembly; the second bonding area on the second surface is at least partially located on the side of the second connection area farther from the electrode assembly. By disposing of bonding areas at different positions on different surfaces, a better connection between the connector and the flexible housing can be achieved, thereby sealing the sealed space formed by the flexible housing.

[0015] In one possible implementation, when projected along the thickness direction of the connector, the first adhesive region and the second connection region at least partially overlap, and / or, the second adhesive region and the first connection region at least partially overlap.

[0016] In this embodiment, the first bonding area and the second connecting area partially overlap, and / or the second bonding area and the first connecting area partially overlap, which can ensure a good seal between the connector and the flexible shell while reducing the length of the connector, thereby improving the space utilization rate inside the battery cell and increasing the energy density of the battery cell.

[0017] In one possible implementation, when projected along the thickness direction of the connector, the adhesive area and the first connection area at least partially overlap.

[0018] In this embodiment, the first connection area is connected to components other than the battery cell, and the adhesive area is bonded to the flexible shell to seal the accommodating space formed by the flexible shell. Projecting along the thickness direction of the connector, the adhesive area and the first connection area at least partially overlap, which can effectively reduce the length of the connector.

[0019] In one possible implementation, the bonding area includes a first bonding area and a second bonding area, the first bonding area and the second bonding area being located on the first surface and the second surface, respectively.

[0020] In this embodiment, the first surface and the second surface are two opposing surfaces of the connector. The first adhesive area and the second adhesive area are respectively disposed on the two opposing surfaces, meaning that the first adhesive area and the second adhesive area are connected to the flexible shell on both surfaces of the connector, thereby better sealing the accommodating space formed by the flexible shell.

[0021] In one possible implementation, when projected along the thickness direction of the connector, the first connecting region and the first adhesive region at least partially overlap.

[0022] In this embodiment, the first connecting region is connected to components other than the battery cell, and the first adhesive region is used to adhere to the flexible shell to seal the accommodating space formed by the flexible shell. Ensuring that the first connecting region and the first adhesive region at least partially overlap allows for tight adhesion between the connector and the flexible shell while reducing the length of the connector.

[0023] In one possible implementation, the second adhesive region and the first connecting region are located on the same surface of the first surface and the second surface, and at least a portion of the second adhesive region is located on one or both sides of the first connecting region along the length direction of the connector.

[0024] In this embodiment, the first connecting area and the first adhesive area are located on different surfaces of two opposing faces of the connector. When the second adhesive area and the first connecting area are located on the same surface of the connector, that is, the second adhesive area and the first adhesive area are also located on different surfaces of the connector. Furthermore, at least a portion of the second adhesive area is located on one or both sides of the first connecting area. This ensures a reduction in the length of the connector while also achieving a further sealed connection between the connector and the flexible shell by adding the second adhesive area.

[0025] In one possible implementation, the second adhesive region is configured as an annular region surrounding the first connection region.

[0026] In this embodiment, the second bonding area and the first connecting area are located on the same side of the connector, while the first bonding area is located on the opposite side of the connector. The partial overlap between the first bonding area and the first connecting area can reduce the length of the connector. The second bonding area forms an annular area and surrounds the first connecting area, which can further enhance the sealing connection effect between the connector and the flexible shell.

[0027] In one possible implementation, the flexible housing has an opening in the area corresponding to the first connection area.

[0028] In this embodiment, the second bonding region forms an annular region and surrounds the first connecting region. An opening is provided on the flexible shell, and the annular region formed by the second bonding region can be located near the opening to achieve a sealed connection between the connector and the flexible shell; at the same time, the first connecting region is used to connect with components other than the battery cell, and by providing the opening, the first connecting region is exposed so that the first connecting region can be connected with the external component.

[0029] In one possible implementation, the first adhesive region and the second connecting region are located on the same surface of the first surface and the second surface.

[0030] In this embodiment, the first bonding area and the second connecting area are located on the same surface, while the first connecting area and the second connecting area are located on different surfaces. The first bonding area and the first connecting area partially overlap, which can reduce the length of the connector and thus increase the relative length of the electrode assembly, thereby improving the energy density of the battery cell.

[0031] In one possible implementation, the first adhesive region covers at least a portion of the second connection region.

[0032] In this embodiment, the first adhesive area and the first connecting area are located on two opposite surfaces of the connector, and the first adhesive area and the second connecting area are located on the same surface. The first adhesive area covers at least a portion of the second connecting area, thus placing the first connecting area and the second connecting area on opposite surfaces of the connector. The second connecting area is used to connect with the electrode assembly, and the first adhesive area seals the connection between the connector and the flexible housing. This ensures both an effective reduction in the length of the connector and the normal current-carrying capacity of the connector.

[0033] In one possible implementation, when projected along the thickness direction of the connector, the adhesive region and the second connection region at least partially overlap.

[0034] In this embodiment, the adhesive region is used to seal the connector to the flexible housing, and the second connection region is used to connect to the electrode assembly. Setting the adhesive region and the second connection region such that their projections along the thickness direction of the connector at least partially overlap reduces the length of the connector, thereby increasing the relative length of the electrode assembly.

[0035] In one possible implementation, the bonding area includes a first bonding area and a second bonding area, the first bonding area and the second bonding area being located on the same surface of the first surface and the second surface, and the first bonding area covering at least a portion of the second bonding area.

[0036] In this embodiment, the bonding area and the second connection area overlap at least partially. By setting the first bonding area and the second connection area on the same side of the connector and having the first bonding area cover at least part of the second connection area, the first bonding area, the first connection area and the second connection area can overlap at least partially, which can further reduce the length of the connector.

[0037] In one possible implementation, the bonding area is provided with an adhesive strip for sealing the receiving space, the adhesive strip protruding from the edge of the connector along the width direction of the connector.

[0038] In this embodiment, the bonding area is used to bond with the flexible shell to seal the accommodating space formed by the flexible shell. The sealing connection is achieved through an adhesive strip, a method that is simple to operate and widely applicable in production processes. Furthermore, the adhesive strip protrudes beyond the edge of the connector in the width direction, thus enhancing its bonding effect.

[0039] Secondly, a battery is provided, comprising a plurality of battery cells as described in the above embodiments.

[0040] Thirdly, an electrical device is provided, including the battery in the above embodiments, the battery being used to provide electrical energy. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of this application;

[0042] Figure 2 This is an exploded structural diagram of a battery according to an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of the prior art;

[0044] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0046] Figure 6 yes Figure 5 A schematic diagram of the explosion of a single battery cell;

[0047] Figure 7 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application;

[0048] Figure 8 yes Figure 7 A schematic diagram of the explosion of a single battery cell;

[0049] Figure 9 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application;

[0050] The reference numerals in the detailed embodiments are as follows:

[0051] Controller 11, motor 12, housing 20, flexible shell 31, electrode assembly 32, connector 33;

[0052] First housing portion 201, second housing portion 202, battery accommodating space 203, opening 311, first surface 331, second surface 332, first connecting area 333, adhesive area 334, second connecting area 335;

[0053] First bonding area 3341, second bonding area 3342. Detailed Implementation

[0054] 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.

[0055] 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, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of this application, technical terms such as "first" and "second" 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.

[0057] 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.

[0058] 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 have an "or" relationship.

[0059] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0060] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0061] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0062] In this application, the battery cell may include lithium metal secondary batteries, sodium metal batteries, or magnesium metal batteries, etc., and the embodiments of this application are not limited to this. The battery cell may be cylindrical, flat, or other shapes, and the embodiments of this application are not limited to this either. For ease of explanation, the following embodiments use lithium metal batteries as an example.

[0063] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0064] Existing pouch batteries typically consist of an electrode assembly, connectors, sealant, and a flexible casing. In the fabrication of a pouch battery cell, the positive electrode, negative electrode, and separator are first assembled into an electrode assembly by stacking or winding. The foil of the electrode without active material coating is then pre-welded, trimmed, and welded to the connector. Finally, the flexible casing is heat-sealed. For a typical pouch battery, the overall length of the cell is composed of the length of the electrode assembly, the length of the welding area between the electrode assembly and the connector, and the length of the sealing area of ​​the connector. Typically, the length of the welding area between the electrode assembly and the connector is greater than the length of the sealing area of ​​the connector. To improve the energy density of the cell, it is necessary to reduce the length of the welding area between the electrode assembly and the connector, as well as the length of the sealing area of ​​the connector. However, in the current technology, there are two main methods to reduce the proportion of these two components in the overall length of the cell: (1) replacing the length direction with the thickness direction, but this method puts significant pressure on the packaging bag and has low long-term reliability; (2) reducing the length of the sealing area of ​​the connector, but this method results in a connector with a smaller welding area, which reduces the current-carrying capacity of the connector. Therefore, how to improve the energy density of batteries while ensuring high sealing of packaging bags is an urgent problem to be solved.

[0065] Based on the above considerations, this application provides a novel structural design for a connector, which overlaps the length of the welding area of ​​the electrode assembly and the length of the sealing area of ​​the connector, thereby reducing the overall length of the connector and increasing the relative length of the electrode assembly under the same battery cell length, thereby improving the internal space utilization of the battery and increasing the energy density of the battery.

[0066] The structural design of the connector piece described in the embodiments of this application is applicable to battery cells, batteries, and electrical devices that use batteries.

[0067] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0068] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0069] Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0070] The vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery 2 to supply power to the motor 12, for example, for the power needs of the vehicle 1 during startup, navigation and driving.

[0071] In some embodiments of this application, the battery 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0072] Figure 2 This is an exploded schematic diagram of battery 2 provided in one embodiment of this application. Figure 2 As shown, battery 2 includes a housing 20 and a battery cell 3, with the battery cell 3 housed within the housing 20.

[0073] The housing 20 is used to accommodate the battery cell 3. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing portion 201 and a second housing portion 202, which overlap each other, and together define a battery-accommodating space 203 for accommodating the battery cell 3. The second housing portion 202 may be a hollow structure with one end open, and the first housing portion 201 may be a plate-like structure, with the first housing portion 201 covering the open side of the second housing portion 202 to form a housing 20 with the accommodating space 203; the first housing portion 201 and the second housing portion 202 may also both be hollow structures with one side open, with the open side of the first housing portion 201 covering the open side of the second housing portion 202 to form a housing 20 with the battery-accommodating space 203. Of course, the first box section 201 and the second box section 202 can be of various shapes, such as cylinders, cuboids, etc.

[0074] To improve the sealing performance after the first housing part 201 and the second housing part 202 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 201 and the second housing part 202.

[0075] Assuming that the first box part 201 covers the top of the second box part 202, the first box part 201 can also be called the upper box cover, and the second box part 202 can also be called the lower box.

[0076] In battery 2, there are multiple battery cells 3. These multiple battery cells 3 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 3 are connected in both series and parallel connections. Multiple battery cells 3 can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 20. Alternatively, multiple battery cells 3 can first be connected in series, parallel, or in a mixed configuration to form a battery module (not shown in the figure), and then these battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20. The multiple battery cells 3 within a battery module can be electrically connected through a busbar component to achieve parallel, series, or mixed connections.

[0077] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of the prior art. Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application. Figure 4As shown, the battery cell 3 includes: a flexible housing 31 with a receiving space; an electrode assembly 32 housed within the receiving space; and a connector 33, which includes a first connecting region 333 and a second connecting region 335. The first connecting region 333 is used to connect with components other than the battery cell 3, and the second connecting region 335 is used to connect with the electrode assembly 32. The connector 33 also includes an adhesive region 334, which is used to bond to the flexible housing 31 to seal the receiving space. Projected along the thickness direction of the connector 33, at least two of the first connecting region 333, the second connecting region 335, and the adhesive region 334 at least partially overlap.

[0078] The electrode assembly 32 is the core component in the battery cell 3 that enables charging and discharging. The electrode assembly 32 includes a positive electrode, a negative electrode, and a separator, with the separator separating the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material coated on the surface of the current collector. The positive current collector can be aluminum foil, and the positive active material layer includes ternary materials, lithium phosphate, or lithium iron phosphate. The negative electrode includes a negative current collector and a negative active material coated on the surface of the current collector. The negative current collector can be copper foil, and the negative active material includes graphite or silicon, etc.

[0079] The electrode assembly 32 can be a wound structure. Specifically, there can be one positive electrode and one negative electrode, and both the positive and negative electrode sheets are strip-shaped structures. The positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence and wound more than two turns to form the electrode assembly. In the preparation of the electrode assembly, the electrode assembly can first be wound into a hollow cylindrical structure, and then flattened into a flat shape.

[0080] Optionally, the electrode assembly 32 may also be a stacked structure. Specifically, multiple positive electrode sheets and multiple negative electrode sheets are provided, and the multiple positive and negative electrode sheets are stacked alternately along the thickness direction Z, with a separator separating the positive and negative electrode sheets.

[0081] Connector 33 is connected to electrode assembly 32. Specifically, there may be two connectors 33, one connected to the positive current collector of the positive electrode plate and the other connected to the negative current collector of the negative electrode plate. The material of connector 33 may be aluminum, nickel, or nickel-plated copper, etc.

[0082] In the above scheme, the battery cell 3 includes a flexible shell 31 with a receiving space, an electrode assembly 32 housed in the receiving space, and a connector 33 connecting components other than the battery cell 3 to the electrode assembly 32. By projecting the connector 33 along its thickness direction, the first connection area 333, the second connection area 335, and the adhesive area 334 on the connector 33 are configured such that at least two of them partially overlap, compared to... Figure 3The connector 33 shown, which consists of a first connection region 333, a second connection region 335, and an adhesive region 334 that do not overlap, can effectively reduce the length of the connector 33 and increase the length of the electrode assembly 32 when the length of the battery cell 3 is the same, thereby improving the space utilization rate inside the battery cell 3 and increasing the energy density of the battery cell 3.

[0083] Optionally, the connector 33 includes a first surface 331 and a second surface 332 disposed opposite to each other along the thickness direction of the connector 33, and at least two of the first connecting area 333, the second connecting area 335 and the adhesive area 334 are located on the first surface 331 and the second surface 332 respectively.

[0084] To reduce the length of the connector 33, at least two of the first connecting area 333, the adhesive area 334, and the second connecting area 335 disposed on the connector 33 overlap. In this embodiment, the first connecting area 333 and the adhesive area 334 may be disposed on the first surface 331, and the second connecting area 335 on the second surface 332; in another embodiment, the first connecting area 333 is disposed on the first surface 331, and the adhesive area 334 and the second connecting area 335 are disposed on the second surface 332. This application does not limit the specific arrangement of the first connecting area 333, the adhesive area 334, and the second connecting area 335 on the first surface 331 and the second surface 332.

[0085] In the above scheme, at least two of the first connecting area 333, the adhesive area 334, and the second connecting area 335 are respectively disposed on the first surface 331 and the second surface 332 of the connector 33 along the thickness direction, that is, at least two of the first connecting area 333, the adhesive area 334, and the second connecting area 335 overlap, which can effectively reduce the length of the connector 33.

[0086] Optionally, when projected along the thickness direction of the connector 33, the first connecting region 333 and the second connecting region 335 at least partially overlap.

[0087] The first connection area 333 is connected to components other than the battery cell 3, and the second connection area 335 is connected to the electrode assembly 32. The first connection area 333 and the second connection area 335 overlap at least partially, that is, the first connection area 333 and the second connection area 335 are disposed on two opposite surfaces of the connector 33.

[0088] In the above scheme, when projected along the thickness direction of the connector 33, the first connecting region 333 and the second connecting region 335 at least partially overlap, which means reducing the total length of the first connecting region 333 and the second connecting region 335 on the connector 33. This can effectively reduce the length of the connector 33, thereby increasing the relative length of the electrode assembly 32.

[0089] Optionally, the first connecting region 333 and the second connecting region 335 are respectively disposed on the first surface 331 and the second surface 332.

[0090] The first connecting region 333 and the second connecting region 335 are respectively disposed on the first surface 331 and the second surface 332. That is, the first connecting region 333 is disposed on the first surface 331 and the second connecting region 335 is disposed on the second surface 332, or the first connecting region 333 is disposed on the second surface 332 and the second connecting region 335 is disposed on the first surface 331.

[0091] In the above scheme, the first surface 331 and the second surface 332 are two opposing surfaces of the connector 33. By placing the first connecting area 333 and the second connecting area 335 on two opposing surfaces, the first connecting area 333 and the second connecting area 335 overlap in the thickness direction of the connector 33. Compared to the original parallel placement, this effectively reduces the length of the connector. Furthermore, the edge of the second connecting area 335 on the second surface 332 can extend to the edge of the second surface 332, which helps improve the flow capacity of the connector 33.

[0092] Optionally, such as Figure 4 As shown, the bonding area 334 includes a first bonding area 3341 and a second bonding area 3341. The first bonding area 3341 is located on the first surface 331, and at least a portion of the first bonding area 3341 is located on the side of the first connection area 333 close to the electrode assembly 32. The second bonding area 3342 is located on the second surface 332, and at least a portion of the second bonding area 3342 is disposed on the side of the second connection area 335 away from the electrode assembly 32.

[0093] Figure 5 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application. Figure 6 yes Figure 5 A schematic diagram of an exploded battery cell. (See diagram below.) Figure 5 and Figure 6 As shown in this embodiment, the flexible housing 31 forms a receiving space, in which the electrode assembly 32 is received. The flexible housing 31 covers the second connection area 335. That is, an opening is provided at the edge of the receiving space containing the electrode assembly 32, through which a portion of the electrode assembly 32 extends. Simultaneously, the flexible housing 31 can extend to the edge of the second surface 332, and the flexible housing 31 and the second surface 332 are sealed together via the second adhesive area 3342. Sealing areas can also be provided on the other two edges of the second surface 332 to enhance the sealing connection between the flexible housing 31 and the second surface 332; this application does not limit this.

[0094] The flexible housing 31 can cover only the second surface 332 while leaving the first surface 331 exposed. A portion of the electrode assembly 32 extends from the opening of the receiving space and connects to the second connection area 335. The first adhesive area 3341 seals this opening.

[0095] In the above scheme, the bonding area 334 includes a first bonding area 3341 and a second bonding area 3342 disposed on two different surfaces. Specifically, the first bonding area 3341 disposed on the first surface 331 is at least partially located on the side of the first connecting area 333 near the electrode assembly 32; the second bonding area 3342 disposed on the second surface 332 is at least partially located on the side of the second connecting area 335 near the electrode assembly 32. By disposing the bonding areas 334 at different positions on different surfaces, a better connection between the connector 33 and the flexible housing 31 can be achieved, thereby sealing the accommodating space formed by the flexible housing 31.

[0096] Optionally, when projected along the thickness direction of the connector 33, the first bonding area 3341 and the second connecting area 335 at least partially overlap, and / or, the second bonding area 3342 and the first connecting area 333 at least partially overlap.

[0097] The first bonding area 3341 and the first connecting area 333 are disposed on the first surface 331, and the second bonding area 3342 and the second connecting area 335 are disposed on the second surface 332.

[0098] In the above scheme, the first bonding area 3341 and the second connecting area 335 partially overlap, and / or the second bonding area 3342 and the first connecting area 333 partially overlap, which can make the bonding area 334 and the flexible shell 31 well sealed, while also reducing the length of the connector 33, thereby improving the space utilization rate inside the battery cell 3 and increasing the energy density of the battery cell 3.

[0099] Figure 7 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application. Figure 7 As shown, when projected along the thickness direction of the connector 33, the bonding area 334 and the first connection area 333 at least partially overlap.

[0100] The first connection area 333 is connected to components other than the battery cell 3, and the adhesive area 334 is used to bond with the flexible shell 31 to seal the accommodating space formed by the flexible shell 31. The first connection area 333 and the adhesive area 334 overlap at least partially, that is, the first connection area 333 and the adhesive area 334 are set on two opposite surfaces of the connector 33.

[0101] In the above scheme, when projected along the thickness direction of the connector 33, the first connecting area 333 and the bonding area 334 at least partially overlap, which reduces the total length of the first connecting area 333 and the bonding area 334 on the connector 33. This can effectively reduce the length of the connector 33, thereby increasing the relative length of the electrode assembly 32.

[0102] Optionally, the bonding area 334 includes a first bonding area 3341 and a second bonding area 3342, with the first bonding area 3341 and the second bonding area 3342 located on the first surface 331 and the second surface 332, respectively.

[0103] Projected along the thickness direction of the connector 33, the bonding area 334 and the first connection area 333 at least partially overlap. The bonding area 334 includes a first bonding area 3341 and a second bonding area 3342, which are located on different surfaces of the connector 33. That is, both the first bonding area 3341 and the second bonding area 3342 are bonded to the flexible shell 31 and can seal the accommodating space.

[0104] In the above scheme, the first bonding area 3341 and the second bonding area 3342 are respectively set on two opposite surfaces, that is, the first bonding area 3341 and the second bonding area 3342 are connected to the flexible shell 31 on both surfaces of the connector 33, so as to better seal the accommodating space formed by the flexible shell 31.

[0105] Optionally, when projected along the thickness direction of the connector 33, the first connection area 333 and the first bonding area 3341 at least partially overlap.

[0106] The bonding area 334 includes a first bonding area 3341 and a second bonding area 3342, which are located on different surfaces of the connector 33. The first bonding area 3341 and the first connecting area 333 overlap at least partially, that is, the first connecting area 333 and the second bonding area 3342 are located on the same surface.

[0107] In the above scheme, the first connecting area 333 is connected to components other than the battery cell 3, and the first adhesive area 3341 is used to bond to the flexible shell 31 to seal the accommodating space formed by the flexible shell 31. Ensuring that the first connecting area 333 and the first adhesive area 3341 at least partially overlaps can both ensure that the connector 33 is tightly bonded to the flexible shell 31 and reduce the length of the connector 33.

[0108] Optionally, the second bonding area 3342 and the first connecting area 333 are located on the same surface of the first surface 331 and the second surface 332. Along the length direction of the connector 33, at least a portion of the second bonding area 3342 is located on one or both sides of the first connecting area 333.

[0109] The second bonding area 3342 and the first connecting area 333 are located on the same side of the connector 33, while the first bonding area 3341 and the second connecting area 335 are located on the other side of the connector 33.

[0110] In the above scheme, at least a portion of the second bonding area 3342 is located on one or both sides of the first connecting area 333, and the first bonding area 3341 and the first connecting area 333 at least partially overlap. This reduces the length of the connector 33 and allows for a further sealed connection between the connector 33 and the flexible shell 31 by adding the second bonding area 3342.

[0111] Figure 8 yes Figure 7 A schematic diagram of an exploded battery cell. (See diagram below.) Figure 8 As shown, the second bonding region 3342 is configured as an annular region surrounding the first connecting region 333.

[0112] In the embodiments of this application, such as Figure 8 As shown, the first bonding area 3341 and the second connecting area 335 are located on the same surface of the connector 33, such as the second surface 332; the second bonding area 3342 and the first connecting area 333 are located on the other surface of the connector 33, such as the first surface 331. In the embodiments of this application, when the second bonding area 3342 is an annular area surrounding the first connecting area 333, the connector 33 can also be accommodated in the accommodating space formed by the flexible shell 31, but this application does not limit this.

[0113] In the above scheme, the second bonding area 3342 and the first connecting area 333 are located on the same side of the connector 33, and the first bonding area 3341 is located on the opposite side of the connector 33. The partial overlap between the first bonding area 3341 and the first connecting area 333 can reduce the length of the connector 33. The second bonding area 3342 forms an annular area and surrounds the first connecting area 333, which can further enhance the sealing connection effect between the connector 33 and the flexible shell 31.

[0114] Please continue to refer to this. Figure 8 ,like Figure 8 As shown, optionally, an opening 311 is provided on the flexible housing 31 in the area corresponding to the first connection area 333.

[0115] The first connection area 333 is used to connect with components other than the battery cell 3. When the second bonding area 3342 is an annular area surrounding the first connection area 333, and the connector 33 can also be accommodated in the accommodating space formed by the flexible shell 31, the first connection area 333 must be exposed to the outside in order to connect with external components.

[0116] In the above scheme, the second bonding area 3342 forms an annular area and surrounds the first connecting area 333. An opening 311 is provided on the flexible shell 31, and the annular area formed by the second bonding area 3342 can be located near the opening 311 to achieve a sealed connection between the connector 33 and the flexible shell 31; at the same time, the first connecting area 333 is used to connect with components other than the battery cell 3. By providing the opening 311, the first connecting area 333 is exposed so that the first connecting area 333 can be connected with external components.

[0117] Optionally, the first bonding area 3341 and the second connecting area 335 are located on the same surface of the first surface 331 and the second surface 332.

[0118] The first bonding area 3341 and the second connecting area 335 are located on the same surface of the first surface 331 and the second surface 332; the second bonding area 3342 and the first connecting area 333 are located on the same surface of the first surface 331 and the second surface 332.

[0119] Optionally, the first bonding area 3341 covers at least a portion of the second connecting area 335.

[0120] In the above scheme, the first bonding area 3341 and the first connecting area 333 are located on two opposite surfaces of the connector 33, and the first bonding area 3341 and the second connecting area 335 are located on the same surface, with the first bonding area 3341 covering at least a portion of the second connecting area 335. Thus, the first connecting area 333 and the second connecting area 335 are located on two opposite surfaces of the connector 33. The second connecting area 335 is used to connect with the electrode assembly 32, and the first bonding area 3341 seals the connection between the connector 33 and the flexible housing 31. This ensures both an effective reduction in the length of the connector 33 and the normal current-carrying capacity of the connector 33.

[0121] Optionally, when projected along the thickness direction of the connector 33, the bonding area 334 and the second connection area 335 at least partially overlap.

[0122] The bonding area 334 is used to seal the connector 33 to the flexible housing 31, and the second connection area 335 is used to connect to the electrode assembly 32.

[0123] In the above scheme, setting the bonding area 34 and the second connection area 335 to at least partially overlap along the thickness direction of the connector 33 can reduce the length of the connector 33 and thereby increase the relative length of the electrode assembly 32.

[0124] Figure 9 This is a schematic diagram of the structure of a battery cell according to another embodiment of this application. Figure 9 As shown, the bonding area 334 includes a first bonding area 3341 and a second bonding area 3342. The first bonding area 3341 and the second connecting area 335 are located on the same surface of the first surface 331 and the second surface 332. The first bonding area 3341 covers at least a portion of the second connecting area 335.

[0125] The first bonding area 3341 and the second connecting area 335 are located on the same surface of the connector 33, such as Figure 9 The second surface 332; the second bonding area 3342 and the first connecting area 333 are located on the same surface of the connector, such as Figure 9 The first face 331 is shown.

[0126] In the above scheme, the bonding area 334 and the second connecting area 335 overlap at least partially. By setting the first bonding area 3341 and the second connecting area 335 on the same side of the connector 33 and the first bonding area 3341 covering at least part of the second connecting area 335, the first bonding area 3341, the first connecting area 333 and the second connecting area 335 can overlap at least partially, which can further reduce the length of the connector 33.

[0127] Optionally, the bonding area 334 is provided with an adhesive strip, which is used to seal the receiving space. The adhesive strip protrudes from the edge of the connector 33 along the width direction of the connector 33.

[0128] like Figure 9 As shown, the first bonding area 3341 and the second connecting area 335 are located on the second surface 332, and the first bonding area 3341 covers at least a portion of the second connecting area 335. The second bonding area 3342 and the first connecting area 333 are located on the first surface 331. An opening is provided at the edge of the receiving space of the flexible housing 31 so that the second connecting area 335 can be connected to the electrode assembly 32. Both the first bonding area 3341 and the second bonding area 3342 seal the receiving space at this opening.

[0129] In the above scheme, the bonding area 334 is used to bond with the flexible shell 31 to seal the accommodating space formed by the flexible shell 31. The sealing connection is achieved through an adhesive strip, a method that is simple to operate and can be widely used in the production process. Furthermore, the adhesive strip protrudes beyond the edge of the connector 33 in the width direction, which increases the bonding effect of the adhesive strip.

[0130] According to some embodiments of this application, see Figure 7 and Figure 8 This application provides a battery cell 3, in which an electrode assembly 32 and a connector 33 are all housed within a space formed by a flexible housing 31. The connector 33 includes a first connecting region 333, an adhesive region 334, and a second connecting region 335. The adhesive region 334 includes a first adhesive region 3341 and a second adhesive region 3342. The second adhesive region 3342 and the first connecting region 333 are disposed on a first surface 331, and the first adhesive region 3341 and the second connecting region 335 are disposed on a second surface 332. An opening 311 is provided on the first surface 331 to expose the first connecting region 333 so that the first connecting region 333 can be connected to the outside. The first adhesive region 3341 can be provided at the connection between the electrode assembly 32 and the second connecting region 335 to seal the connection. The second adhesive region 3342 is configured as an annular region surrounding the first connecting region 333 to seal the opening 311. The second connection area 335 and the electrode assembly 32 can be connected by ultrasonic / laser welding. After welding, a layer of heat-insulating material is coated on the surface to prevent damage to the insulation layer. Projected along the thickness direction of the connector 33, the first connection area 333 and the second connection area 335 partially overlap.

[0131] This application also provides a battery 2, which includes multiple battery cells 3 as described in the foregoing embodiments.

[0132] This application embodiment also provides an electrical device, including the battery 2 in the foregoing embodiment, the battery 2 being used to provide electrical energy.

[0133] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: A flexible housing, including a containment space; Electrode assembly, housed within the housing space; The connector includes a first connection area and a second connection area. The first connection area is used to connect with components other than the battery cell, and the second connection area is used to connect with the electrode assembly. The connector also includes an adhesive area for bonding with the flexible housing to seal the receiving space. Projected along the thickness direction of the connector, the first connecting region and the second connecting region at least partially overlap, and at least one of the first connecting region and the second connecting region at least partially overlaps with the adhesive region; The connector includes a first surface and a second surface disposed opposite to each other along the thickness direction of the connector. The first connecting area and the second connecting area are located on different surfaces of the first surface and the second surface, respectively. The bonding area includes a first bonding area and a second bonding area, which are located on different surfaces of the first surface and the second surface, respectively.

2. The battery cell according to claim 1, characterized in that, The first connection area and the second connection area are respectively disposed on the first surface and the second surface.

3. The battery cell according to claim 2, characterized in that, The first adhesive region is located on the first surface, and at least a portion of the first adhesive region is located on the side of the first connection region closer to the electrode assembly; the second adhesive region is located on the second surface, and at least a portion of the second adhesive region is located on the side of the second connection region away from the electrode assembly.

4. The battery cell according to claim 3, characterized in that, Projecting along the thickness direction of the connector, the first bonding area and the second connection area at least partially overlap, and / or, The second bonding area and the first connecting area overlap at least partially.

5. The battery cell according to claim 1, characterized in that, Projected along the thickness direction of the connector, the bonding area and the first connection area at least partially overlap.

6. The battery cell according to claim 5, characterized in that, The first connecting area and the first adhesive area are located on the first surface and the second surface, respectively.

7. The battery cell according to claim 6, characterized in that, Projected along the thickness direction of the connector, the first connecting area and the first adhesive area at least partially overlap.

8. The battery cell according to claim 6, characterized in that, The second adhesive area and the first connecting area are located on the first surface. Along the length direction of the connector, at least a portion of the second adhesive area is located on one or both sides of the first connecting area.

9. The battery cell according to claim 8, characterized in that, The second bonding area is configured as a ring-shaped area surrounding the first bonding area.

10. The battery cell according to claim 9, characterized in that, An opening is provided on the flexible shell in the area corresponding to the first connection area.

11. The battery cell according to claim 6, characterized in that, The first adhesive area and the second connecting area are located on the same surface of the first surface and the second surface.

12. The battery cell according to claim 11, characterized in that, The first adhesive area covers at least a portion of the second connection area.

13. The battery cell according to claim 1, characterized in that, Projected along the thickness direction of the connector, the bonding area and the second connection area at least partially overlap.

14. The battery cell according to claim 13, characterized in that, The bonding area includes a first bonding area and a second bonding area, the first bonding area and the second bonding area are located on the same surface of the first surface and the second surface, and the first bonding area covers at least a portion of the second bonding area.

15. The battery cell according to any one of claims 1 to 14, characterized in that, The bonding area is provided with an adhesive strip, which is used to seal the receiving space. The adhesive strip protrudes from the edge of the connector along the width direction of the connector.

16. A battery, characterized in that, include Multiple battery cells as described in any one of claims 1-15.

17. An electrical appliance, characterized in that, include: The battery of claim 16 is used to provide electrical energy.

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