Battery cell, battery, and power consumption device

Abstract

Embodiments of the present application provide a battery cell, a battery, and a power consumption device. The battery cell includes a housing, an electrode terminal, and an electrode assembly. The electrode terminal is installed in the housing, the electrode assembly is housed in the housing, the electrode assembly includes a main body portion and a tab, the tab extends from an end face of the main body portion, the tab includes a first connection portion and a second connection portion, the first connection portion is used for connecting to the electrode terminal, the second connection portion is connected to the main body portion, and along the longitudinal direction of the end face, the first connection portion at least partially exceeds the second connection portion. By arranging the first connection portion to exceed the second connection portion in the longitudinal direction of the end face, the connectable range of the first connection portion in the longitudinal direction of the end face can be expanded, facilitating the direct connection of the first connection portion to the electrode terminal, optimizing the internal structure of the battery cell, increasing the available space of the electrode assembly, and improving the energy density of the battery cell.

Description

Cross - reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202210823644.5, titled "Battery Cell, Battery and Power Consumption Device", filed on July 14, 2022, and the entire content of the said application is incorporated herein by reference.

Technical Field

[0002] This application belongs to the field of battery technology, and particularly relates to battery cells, batteries and power consumption devices.

Background Art

[0003] As the consumption of natural resources and environmental destruction become increasingly serious, the interest in devices that can store energy and effectively utilize the stored energy in various fields is growing. A battery cell is a system that can be combined with each other to utilize new renewable energy.

[0004] How to improve the energy density of battery cells is an important research direction in battery technology.

Summary of the Invention

[0005] Embodiments of this application provide a battery cell, a battery and a power consumption device, which can directly connect the tab to the electrode terminal and improve the energy density of the battery.

[0006] According to a first aspect of the embodiments of this application, a battery cell is provided, which includes a housing, an electrode terminal and an electrode assembly. The electrode terminal is installed in the housing, the electrode assembly is accommodated in the housing, the electrode assembly includes a main body portion and a tab, the tab extends from an end face of the main body portion, the tab includes a first connection portion and a second connection portion, the first connection portion is used to connect to the electrode terminal, the second connection portion is connected to the main body portion, and along the longitudinal direction of the end face, the first connection portion at least partially exceeds the second connection portion.

[0007] By adopting the above structure and installing the first connecting portion beyond the second connecting portion in the longitudinal direction of the end face, the connectable range of the first connecting portion in the longitudinal direction of the end face can be expanded, facilitating the direct connection of the first connecting portion to the electrode terminal, optimizing the internal structure of the battery cell, increasing the available space of the electrode assembly, and improving the energy density of the battery cell.

[0008] In some alternative embodiments of the present application, the first connecting portion is connected to the electrode terminal to form a connection region, and along the longitudinal direction of the end face, at least a part of the connection region extends beyond the second connecting portion.

[0009] By adopting the above structure and installing the connection region beyond the second connecting portion in the longitudinal direction of the end face, the connection position between the first connecting portion and the electrode terminal can be located at the exceeding part of the first connecting portion. Even if the position where the tab is pulled out is not aligned with the electrode terminal, the tab can be connected to the electrode terminal by the part of the first connecting portion that exceeds the second connecting portion.

[0010] In some alternative embodiments of the present application, along the longitudinal direction of the end face, the size of the first connecting portion is larger than the size of the second connecting portion.

[0011] By adopting the above structure and setting the size of the first connecting portion to be larger than the size of the second connecting portion in the longitudinal direction of the end face, a larger area can be obtained for the first connecting portion, facilitating the connection with the electrode terminal.

[0012] In some alternative embodiments of the present application, a notch is provided at the connection location between the second connecting portion and the main body portion.

[0013] By adopting the above structure and providing a notch, the size of the connection position between the main body part in the second connection part can be reduced, the distance between the second connection part and other members in the battery cell (for example, the insulating plate between the electrode assembly and the first wall) can be increased, and interference between the second connection part and other members can be avoided.

[0014] In some alternative embodiments of the present application, the tab presents an L-shape or a T-shape.

[0015] By adopting the above structure and setting the tab to an L-shape or a T-shape, the size of the first connection part in the longitudinal direction of the end face can be significantly increased, facilitating the connection between the tab and the electrode terminal. Also, the size of the second connection part in the longitudinal direction of the end face can be significantly reduced, preventing contact between the second connection part and the bump.

[0016] In some alternative embodiments of the present application, the tab includes a positive tab and a negative tab. Both the positive tab and the negative tab are installed on the end face. The positive tab and the negative tab each include a first connection part and a second connection part. The extending directions of the first connection parts of the positive tab and the negative tab are opposite.

[0017] By adopting the above structure and extending the first connection parts of the positive tab and the negative tab in opposite directions, the tab can meet the installation requirements of different types of electrode terminals. For example, when the electrode terminal is located between the second connection parts of the positive tab and the negative tab, the two first connection parts extend along directions approaching each other. When the electrode terminal is located on both sides of the second connection parts of the positive tab and the negative tab, the two first connection parts extend along directions away from each other.

[0018] In some alternative embodiments of the present application, the housing includes a first wall. The electrode terminal is installed on the first wall, and the end face faces the first wall.

[0019] In some alternative embodiments of the present application, the electrode terminal is located at the end of the first wall, and the positive tab and the negative tab extend in a direction away from each other.

[0020] By adopting the above structure, installing the electrode terminal at the end of the first wall, and extending the positive tab and the negative tab in a direction away from each other, the extraction positions on the end faces of the positive tab and the negative tab can be converged to the middle, the interference with the members on both sides of the positive tab and the negative tab can be reduced, and a larger pitch can be present between the connection regions of the positive tab and the negative tab, thereby improving the safety of the battery cell.

[0021] In some alternative embodiments of the present application, an insulating plate is further installed on one side of the first wall facing the electrode assembly, and the insulating plate is used to insulate the first wall and the electrode assembly.

[0022] In some alternative embodiments of the present application, bumps extending toward the end face are installed on the insulating plate, the bumps abut against the end face, and along the longitudinal direction of the end face, the distance between the second connection portion and the insulating plate is L, and L≥0.5 mm.

[0023] By adopting the above structure and restricting the relative distance between the bump and the second connection portion, the problem of short circuit caused by the second connection portion and the bump being pressed against each other and abutting can be significantly reduced.

[0024] In some alternative embodiments of the present application, the tab includes multiple sub-tabs, and in two adjacent layers of the sub-tabs, the projection on the end face of the sub-tab close to the electrode terminal covers the projection of the sub-tab away from the electrode terminal.

[0025] By adopting the above structure and gradually increasing the sub-tab in the direction towards the electrode terminal, the sub-tab on the side closer to the electrode terminal completely includes the sub-tab on the side farther from the electrode terminal, improving the over-current capacity of the tab and reducing the interference between the tab and the bump.

[0026] In some alternative embodiments of the present application, the first connection portion is installed by being bent with respect to the second connection portion.

[0027] By adopting the above structure and installing the first connection portion and the second connection portion by bending, the space occupied by the tab can be reduced, and the energy density of the battery cell can be improved.

[0028] According to a second aspect of the embodiment of the present application, a battery including the above battery cell is provided.

[0029] According to a third aspect of the embodiment of the present application, a power consumption device including the above battery cell for supplying electrical energy is further provided.

[0030] Compared with the related art, in the battery cell, battery and power consumption device of the embodiment of the present application, in the longitudinal direction of the end face, by installing the first connection portion beyond the second connection portion, the connectable range in the longitudinal direction of the end face of the first connection portion can be expanded, facilitating the direct connection of the first connection portion to the electrode terminal, optimizing the internal structure of the battery cell, increasing the available space of the electrode assembly, and improving the energy density of the battery cell.

Brief Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present application, hereinafter, the necessary drawings used in the embodiments of the present application will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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Embodiments for Carrying Out the Invention

[0032] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are only used for the purpose of more clearly explaining the technical solution of the present application, and are only used as examples, and thus cannot limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "comprising" and "having" and any variations thereof in the description of the specification, claims, and drawings of this application are intended to cover non-exclusively "comprising".

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are only for distinguishing different objects and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, a specific order, or a primary-secondary relationship.

[0035] The "embodiments" referred to in this specification mean that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The appearance of this phrase at each position in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. One of ordinary skill in the art can explicitly or implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is only a relationship for describing related objects and represents that three relationships may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this specification generally represents that the related objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of this application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of sets" refers to two sets or more (including two sets), and "a plurality of sheets" refers to two sheets or more (including two sheets).

[0038] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "vertical direction", "horizontal direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is the orientation or positional relationship shown based on the drawings, and is only for describing and simplifying the description of the embodiments of the present application, and does not indicate or imply that the mentioned device or element must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as limiting the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless specifically defined and limited, terms such as "attachment", "connection", "connection", "fixation", etc., which are technical terms, should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0040] In the development of battery technology, it is necessary to consider various design elements, such as problems like cycle life and battery safety at the same time. Here, the energy density of battery cells has already become an obstacle restricting the further popularization of batteries.

[0041] A battery cell generally includes a housing and an electrode assembly. Here, the electrode assembly is an important part for the battery to complete the electrochemical process. Generally, it is composed of a plate electrode and a separator, and the plate electrode includes a positive plate electrode and a negative plate electrode. The positive plate electrode and the negative plate electrode include a current collector and an active material layer coated thereon. The electrochemical process mainly completes the movement between the positive plate electrode and the negative plate electrode by metal ions such as lithium ions in the active material layer. Therefore, the energy density of the battery cell is correlated with the volume occupancy rate of the electrode assembly.

[0042] The inventor realizes that in order to draw out the electrical energy in the electrode assembly in a battery cell, it is necessary to install an electrode terminal on the housing. One side of the electrode terminal close to the inside of the housing needs to be connected to the electrode assembly. In order to draw out the electrical energy on the electrode assembly, it is found that a tab for connecting to the electrode terminal is installed. However, due to the limitations of the production process, it is difficult to completely align the installation positions of the tab and the electrode terminal. In order to improve the connection efficiency between the electrode terminal and the tab, generally a connecting member is used to connect the tab and the electrode terminal. Obviously, installing the connecting member occupies the space inside the housing, reduces the available space of the electrode assembly, and reduces the energy density of the battery cell.

[0043] In order to alleviate the problem of the reduction in the energy density of the battery cell, the inventor discovers through research that by adjusting the structure of the tab, the tab can still be efficiently connected to the electrode terminal without installing a connecting member, reducing the internal structure of the housing, improving the available space of the electrode assembly, and further improving the energy density of the battery.

[0044] Based on the above considerations, the inventor of the present application has designed a battery cell, a battery, and an electric power consumption device through intensive research.

[0045] Embodiments of the present application provide a power consumption device that uses a battery as a power source. The power consumption device may be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery-powered vehicle, an electric vehicle, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric steamship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, an aerospace plane, a spaceship, etc.

[0046] In the following embodiments, for the sake of convenience of explanation, an example will be given in which the power consumption device of an embodiment of the present application is the vehicle 1000.

[0047] As shown in FIG. 1, FIG. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel-powered vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for starting the vehicle 1000, navigation, and power consumption requirements during operation.

[0048] In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000, but also provide driving power to the vehicle 1000 as a driving power source instead of or partly instead of fuel oil or natural gas.

[0049] The battery mentioned in the embodiments of the present application includes one or more battery cells and is a single physical module that provides a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module, a battery pack, etc.

[0050] As shown in FIG. 2, FIG. 2 is a schematic structural view of the battery 100 according to some embodiments of the present application. In some embodiments of the present application, the battery 100 includes a housing 110, and the housing 110 may include a connected first housing portion 111 and a second housing portion 112. A plurality of battery cells are arranged in the space formed after the first housing portion 111 and the second housing portion 112 are connected after being connected in parallel, in series, or in series-parallel combination with each other. The shapes of the first housing portion 111 and the second housing portion 112 may be determined based on the shape of the combined plurality of battery cells. The battery cell may exhibit a cylindrical body, a flat body, a rectangular parallelepiped, or other shapes, and the embodiments of the present application are not limited thereto. The packaging methods of the battery cells include, but are not limited to, cylindrical battery cells, rectangular parallelepiped square battery cells, and pouch battery cells. The embodiments of the present application are not specifically limited thereto. Further, the battery 100 may further include other structures. For example, it may further include a bus bar member for realizing electrical connection between a plurality of battery cells, which will not be further described herein.

[0051] FIG. 3 is a schematic structural view of a battery cell according to some embodiments of the present application. FIG. 4 is a schematic structural view of the electrode assembly 103 according to some embodiments of the present application.

[0052] As shown in FIGS. 3 and 4, some embodiments of the present application provide a battery cell 10 including a housing 101, an electrode terminal 102, and an electrode assembly 103. The electrode terminal 102 is installed on the housing 101, the electrode assembly 103 is housed in the housing 101, the electrode assembly 103 includes a main body portion 1 and a tab 2, the tab 2 extends from an end face 11 of the main body portion 1, the tab 2 includes a first connection portion 21 and a second connection portion 22, the first connection portion 21 is used to connect to the electrode terminal 102, the second connection portion 22 is connected to the main body portion 1, and along the longitudinal direction of the end face (the x-axis direction in FIG. 4), the first connection portion 21 at least partially exceeds the second connection portion 22.

[0053] The housing 101 is an assembly for forming the internal environment of the battery cell, and the internal environment formed may be used to accommodate the electrode assembly 103, the electrolyte (not shown in the figure), and other members. The housing 101 may have various structural forms, such as a rectangular parallelepiped, a cylindrical body, etc. Exemplarily, the shape of the housing 101 may be determined by the specific shape of the electrode assembly 103. The material of the housing 101 can be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application do not impose special restrictions on this.

[0054] The electrode assembly 103 is an assembly for causing an electrochemical reaction in the battery cell. Exemplarily, the electrode assembly 103 is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate, and generally a separator is provided between the positive electrode plate and the negative electrode plate. The portion of the positive electrode plate having the active material, the portion of the negative electrode plate having the active material, and the separator constitute the main body 1 of the electrode assembly 103, and the portions of the positive electrode plate and the negative electrode plate having no active material respectively constitute the tabs 2. During the charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 2 is connected to the electrode terminal 102 to form an electric current circuit.

[0055] The electrode terminal 102 is used to be electrically connected to the tab 2, and power supply can be drawn out from or drawn into the battery cell. Exemplarily, one end of the electrode terminal 102 is installed inside the housing 101 and connected to the tab 2, and the other end is installed outside the housing 101.

[0056] By installing the first connection portion 21 beyond the second connection portion 22 in the longitudinal direction of the end face, the connectable range of the end face of the first connection portion 21 in the longitudinal direction can be expanded, making it easy to directly connect the first connection portion 21 to the electrode terminal 102, optimizing the internal structure of the battery cell, increasing the available space of the electrode assembly 103, and improving the energy density of the battery cell.

[0057] Optionally, the housing 101 may include a case 1012 and an end cap 1011. The case 1012 has a hollow structure with one side open, and the end cap 1011 covers the opening of the case 1012 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 103 and the electrolyte. The electrode terminal 102 is installed on the end cap 1011. The electrode terminal 102 may include a positive electrode terminal 102 and a negative electrode terminal 102. The positive electrode terminal 102 and the negative electrode terminal 102 are connected to the positive tab and the negative tab on the electrode assembly 103 and are used to output the electrical energy generated by the electrode assembly 103.

[0058] Optionally, the housing 101 may have other structures. For example, the housing 101 may include a case 1012 and two end caps 1011. The case 1012 has a hollow structure with both opposite sides open. One end cap 1011 covers one opening of the case 1012 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 103 and the electrolyte. In such a structure, the positive electrode terminal 102 and the negative electrode terminal 102 may be attached to the same end cap 1011 or different end caps 1011. FIG. 5 is a schematic structural diagram of the electrode assembly 103 according to some other embodiments of the present application. Referring to FIGS. 4 and 5, optionally, in the longitudinal direction of the end face (the x-axis direction in FIGS. 4 and 5), the second connection portion 22 includes a first end 221 and a second end 222 that are oppositely installed, and the first connection portion 21 extends beyond at least one of the first end 221 and the second end 222.

[0059] FIG. 6 is a schematic structural diagram of the electrode assembly 103 according to some other embodiments of the present application. FIG. 7 is a schematic front structural diagram of the embodiment shown in FIG. 6, and FIG. 8 is a schematic top structural diagram of the embodiment shown in FIG. 6. Referring to FIGS. 6 to 8, optionally, in the longitudinal direction of the end face (the x-axis direction in FIG. 8), the first connection part 21 includes a first edge 212 and a second edge 213, and the first edge and the second edge 213 may be set at an angle with the width direction of the end face (the y-axis direction in FIGS. 6 and 8). Optionally, the first edge 212 and the second edge 213 may be installed in a straight line or a curve.

[0060] Referring to FIGS. 6 to 8, optionally, the first end 221 and the second end 222 are set at an angle with the direction perpendicular to the end face (the z-axis direction in FIG. 7).

[0061] Optionally, the extending direction of the first connection part 21 may be set perpendicular to the width direction of the end face, and the extending direction of the second connection part 22 may be set parallel to the direction perpendicular to the end face. In the longitudinal direction of the end face, the first connection part 21 and the second connection part 22 are provided offset. Specifically, in the longitudinal direction of the end face, the size of the first connection part 21 may be smaller than the size of the second connection part 22.

[0062] As shown in FIGS. 4 to 6, in some alternative embodiments of the present application, the first connection part 21 is connected to the electrode terminal 102 to form a connection area 211, and along the longitudinal direction of the end face (the x-axis direction in FIGS. 4 to 6), at least a part of the connection area extends beyond the second connection part 22.

[0063] The connection area 211 is the connection area between the two after the first connection part 21 is connected to the electrode terminal 102. For example, when the first connection part 21 is welded to the electrode terminal 102, the connection area 211 is the welding area formed by welding. When the first connection part 21 is adhered to the electrode terminal 102, the connection area 211 is the adhesion area formed by adhesion.

[0064] In the longitudinal direction of the end face, by installing the connection region 211 beyond the second connection portion 22, the connection position between the first connection portion 21 and the electrode terminal 102 can be positioned at the exceeding portion in the first connection portion 21. Even if the position where the tab 2 is pulled out is not aligned with the electrode terminal 102, the tab 2 can be connected to the electrode terminal 102 by the portion of the first connection portion 21 exceeding the second connection portion 22.

[0065] Optionally, in the longitudinal direction of the end face (the x-axis direction in FIGS. 4 to 6), the second connection portion 22 includes a first end 221 and a second end 222 that are oppositely installed, and the connection region 211 may be partially installed outside the first end 221 and the second end 222, or may all be installed outside the first end 221 and the second end 222.

[0066] As shown in FIG. 4, in some alternative embodiments of the present application, along the longitudinal direction of the end face (the x-axis direction in FIG. 4), the size of the first connection portion 21 is larger than the size of the second connection portion 22. By setting the size of the first connection portion 21 to be larger than the size of the second connection portion 22 in the longitudinal direction of the end face, a larger area can be obtained by the first connection portion 21, facilitating the connection with the electrode terminal 102.

[0067] As shown in FIGS. 4 to 6, in some alternative embodiments of the present application, a notch 23 is provided at the connection location between the second connection portion 22 and the main body portion 1. By providing the notch 23, the size of the connection position between the second connection portion 22 and the main body portion 1 can be reduced, increasing the distance between the second connection portion 22 and other members in the battery cell (for example, the insulating plate between the electrode assembly and the first wall), and avoiding interference between the second connection portion 22 and other members.

[0068] As shown in FIG. 4, in some alternative embodiments of the present application, the tab 2 has an L-shape or a T-shape. By setting the tab 2 to an L-shape or a T-shape, the size in the longitudinal direction (the x-axis direction in FIG. 4) of the end face of the first connection portion 21 can be significantly increased, facilitating the connection between the tab 2 and the electrode terminal 102. Also, the size in the longitudinal direction of the end face of the second connection portion 22 is significantly reduced, preventing contact between the second connection portion 22 and the bump 31.

[0069] Optionally, when the tab 2 has an L-shape, the horizontal portion of the L-shape is the first connection portion 21, and the vertical portion of the L-shape is the second connection portion 22. Optionally, when the tab 2 has a T-shape, one of the two sides connected to the center of the other side is the first connection portion 21, and the other is the second connection portion 22.

[0070] As shown in FIGS. 3 to 6, in some alternative embodiments of the present application, the tab 2 includes a positive tab 201 and a negative tab 202. The positive tab 201 and the negative tab 202 are both installed on the end face. The positive tab 201 and the negative tab 202 each include a first connection portion 21 and a second connection portion 22. The extending directions of the first connection portion 21 of the positive tab 201 and the first connection portion 21 of the negative tab 202 are opposite.

[0071] The fact that the extending directions of the first connection portion 21 of the positive tab 201 and the first connection portion 21 of the negative tab 202 are opposite means that the first connection portion 21 of the positive tab 201 and the first connection portion 21 of the negative tab 202 can extend along directions approaching each other, or the first connection portion 21 of the positive tab 201 and the first connection portion 21 of the negative tab 202 can extend along directions moving away from each other.

[0072] By extending the first connection parts of the positive tab and the negative tab in opposite directions, tab 2 can meet the installation requirements of different types of electrode terminals 102. For example, when the electrode terminal 102 is located between the positive tab 201 and the second connection part 22 of the negative tab 202, the two first connection parts 21 extend along the direction approaching each other. When the electrode terminal 102 is located on both sides of the second connection part 22 of the positive tab 201 and the negative tab 202, the two first connection parts 21 extend along the direction separating from each other.

[0073] FIG. 9 is a schematic diagram of the internal structure of a battery cell according to some embodiments of the present application. FIG. 10 is a schematic diagram of the structure at the location of the electrode terminal 102 in FIG. 9.

[0074] As shown in FIGS. 3, 9 and 10, in some alternative embodiments of the present application, the housing 101 includes a first wall, the electrode terminal 102 is installed on the first wall, and the end face 11 faces the first wall.

[0075] As shown in FIGS. 3, 9 and 10, in some alternative embodiments of the present application, the electrode terminal 102 is located at the end of the first wall, and the positive tab 201 and the negative tab 202 extend in a direction away from each other. By installing the electrode terminal 102 at the end of the first wall and extending the positive tab 201 and the negative tab 202 in a direction away from each other, the extraction positions on the end face 11 of the positive tab 201 and the negative tab 202 can be converged to the middle, the interference with the members on both sides of the positive tab 201 and the negative tab 202 can be reduced, and a larger pitch can be present between the connection regions of the positive tab 201 and the negative tab 202, thereby improving the safety of the battery cell.

[0076] As shown in FIGS. 3, 9 and 10, in some alternative embodiments of the present application, an insulating plate 3 is further installed on one side of the first wall facing the electrode assembly 103, and the insulating plate 3 is used to insulate the first wall and the electrode assembly 103. The insulating plate 3 may be made of materials such as plastic or rubber.

[0077] As shown in FIGS. 3, 9, and 10, in some alternative embodiments of the present application, bumps 31 extending toward the end face are provided on the insulating plate 3. The bumps 31 abut against the end face, and the bumps 31 can reduce the sway of the electrode assembly 103.

[0078] In some alternative embodiments of the present application, along the longitudinal direction of the end face, the distance between the second connection portion 22 and the insulating plate is L, and L≥0.5 mm. By limiting the relative distance between the bump 31 and the second connection portion 22, the problem of short circuit caused by the second connection portion 22 and the bump 31 being pressed against each other and abutting can be significantly reduced.

[0079] Optionally, the distance between the second connection portion 22 and the insulating plate is L, satisfying 0.5 mm≤L≤70 mm. Optionally, the distance between the second connection portion 22 and the insulating plate is L, and L may be 1 mm, 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm. Optionally, the bumps 31 include at least three, corresponding to both sides and the middle of the end face respectively. Along the longitudinal direction of the end face 11, the distance between the second connection portion 22 and the insulating plate may be the distance between the second connection portion 22 of the positive tab and one bump 31, or the distance between the second connection portion 22 of the negative tab and one bump 31.

[0080] FIG. 11 is a schematic structural view of the electrode assembly 103 according to some further embodiments of the present application. As shown in FIG. 11, in some alternative embodiments of the present application, the tab 2 includes multiple layers of sub-tabs. In two adjacent layers of sub-tabs, the projection on the end face of the sub-tab close to the electrode terminal 102 covers the projection of the sub-tab away from the electrode terminal 102. By gradually increasing the sub-tabs in the direction towards the electrode terminal 102, the sub-tabs on the side close to the electrode terminal 102 can completely wrap the sub-tabs on the side away from the electrode terminal 102. The tab 2 is formed by overlapping multiple layers of sub-tabs. When folding, the folding angle of the inner-layer sub-tabs is relatively small, but the folding angle of the outer-layer sub-tabs is relatively large. Therefore, when installed in equal size, the edge of the tab 2 after folding is uneven, difficult to control standardizedly, and is likely to interfere with the housing 101 after the electrode assembly 103 is placed in the housing.

[0081] Optionally, in the direction towards the electrode terminal 102, the arithmetic difference or geometric ratio of the areas of the sub-tabs increases.

[0082] Optionally, in the direction towards the electrode terminal 102, the arithmetic difference or geometric ratio of the areas of the first connection portions 21 on the sub-tabs increases.

[0083] In some alternative embodiments of the present application, the first connection portion 21 is installed by being folded with respect to the second connection portion 22. By folding and installing the first connection portion 21 and the second connection portion 22, the space occupied by the tab 2 can be reduced, and the energy density of the battery cell can be improved.

[0084] In some alternative embodiments of the present application, a battery including the above battery cell is further provided.

[0085] In some alternative embodiments of the present application, a power consumption device including the above battery cell for supplying electrical energy is further provided.

[0086] In some alternative embodiments of the present application, a battery cell is further provided, which includes a housing 101, an electrode terminal 102, and an electrode assembly 103. The electrode terminal 102 is installed on the housing 101, the electrode assembly 103 is accommodated within the housing 101, the electrode assembly 103 includes a main body portion 1 and a tab 2, the tab 2 extends from an end face 11 of the main body portion 1, the tab 2 includes a first connection portion 21 and a second connection portion 22, the first connection portion 21 is installed in a bent manner with respect to the second connection portion 22, the first connection portion 21 is used for connection to the electrode terminal 102, the second connection portion 22 is connected to the main body portion 1, along the longitudinal direction of the end face 11, the first connection portion 21 at least partially exceeds the second connection portion 22. The first connection portion 21 is connected to the electrode terminal 102 to form a connection region, along the longitudinal direction of the end face, the connection region exceeds the second connection portion 22. Along the longitudinal direction of the end face, the size of the first connection portion 21 is larger than the size of the second connection portion 22. The tab 2 presents an L-shape or a T-shape. The tab 2 includes a positive tab 201 and a negative tab 202, both the positive tab 201 and the negative tab 202 are installed on the end face, and the positive tab 201 and the negative tab 202 each include a first connection portion 21 and a second connection portion 22. The housing 101 includes a first wall, the electrode terminal 102 is installed on the first wall, and the end face faces the first wall. The electrode terminal 102 is located at an end of the first wall, and the positive tab and the negative tab extend in a direction away from each other. An insulating plate 3 is further installed on a side of the first wall facing the electrode assembly 103, and the insulating plate 3 is used for insulating the first wall and the electrode assembly 103. A bump 31 extending towards the end face is installed on the insulating plate 3, the bump 31 abuts against the end face, along the longitudinal direction of the end face, the distance between the second connection portion 22 and the insulating plate is L, and L≥0.5 mm. The tab 2 includes multiple layers of sub-tabs, and in two adjacent layers of sub-tabs, the projection on the end face of the sub-tab close to the electrode terminal 102 covers the projection of the sub-tab away from the electrode terminal 102.

[0087] Compared with related technologies, in the battery cell, battery, and power consumption device of the embodiments of the present application, by installing the first connection portion 21 beyond the second connection portion 22 in the longitudinal direction of the end face, the connectable range of the end face of the first connection portion 21 in the longitudinal direction can be expanded, making it easier to directly connect the first connection portion 21 to the electrode terminal 102, optimizing the internal structure of the battery cell, increasing the available space of the electrode assembly 103, and improving the energy density of the battery cell.

[0088] Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present application and do not limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to make modifications to the technical solutions described in the above embodiments, or perform equivalent substitutions for some or all of their technical features. These modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application and should all be included in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can all be combined in any way. The present application is not limited to the specific embodiments disclosed in this specification but includes all technical solutions within the scope of the claims.

Explanation of Reference Numerals

[0089] 1000: Vehicle, 100: Battery, 200: Controller, 300: Motor, 110: Housing, 111: First Housing Portion, 112: Second Housing Portion, 101: Housing, 1011: End Cap, 1012: Case, 102: Electrode Terminal, 103: Electrode Assembly, 1: Body Portion, 11: End Face, 2: Tab, 201: Positive Tab, 202: Negative Tab, 21: First Connection Portion, 211: Connection Region, 212: First Edge, 213: Second Edge, 22: Second Connection Portion, 221: First End, 222: Second End, 23: Notch, 3: Insulating Plate, 31: Bump.

Claims

1. A battery cell, Housing and an electrode terminal installed in the housing; an electrode assembly accommodated in the housing, the electrode assembly including a main body and a tab, the tab extending from an end surface of the main body, the tab including a first connecting portion and a second connecting portion, the first connecting portion being used to connect to the electrode terminal, and the second connecting portion being connected to the main body; the first connecting portion extends at least partially beyond the second connecting portion along the longitudinal direction of the end surface; a battery cell, wherein the first connection portion includes a first edge and a second edge in the longitudinal direction of the end face, the first edge being set at a first angle with respect to the width direction of the end face, and the second edge being set at a second angle with respect to the width direction of the end face, and the width direction of the end face being perpendicular to the longitudinal direction of the end face.

2. 2. The battery cell according to claim 1, wherein the first connection portion is connected to the electrode terminal to form a connection area, and at least a portion of the connection area extends beyond the second connection portion along the longitudinal direction of the end surface.

3. The battery cell according to claim 1 , wherein a size of the first connection portion is larger than a size of the second connection portion along the longitudinal direction of the end surface.

4. The battery cell according to claim 1 , wherein a notch is provided at a connection point between the second connection portion and the main body portion.

5. The battery cell according to claim 1 , wherein the tab is L-shaped or T-shaped.

6. 2. The battery cell according to claim 1, wherein the tabs include a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are both installed on the end surface, the positive electrode tab and the negative electrode tab include a first connection portion and a second connection portion, respectively, and the first connection portion of the positive electrode tab and the first connection portion of the negative electrode tab extend in opposite directions.

7. The battery cell according to claim 6 , wherein the housing includes a first wall, the electrode terminal is disposed on the first wall, and the end surface faces the first wall.

8. The battery cell according to claim 7 , wherein the electrode terminal is located at an end of the first wall, and the positive electrode tab and the negative electrode tab extend in directions away from each other.

9. 8. The battery cell according to claim 7, wherein an insulating plate is further provided on one side of the first wall facing the electrode assembly, and the insulating plate is used to insulate the first wall from the electrode assembly.

10. 10. The battery cell according to claim 9, wherein a bump extending toward the end face is provided on the insulating plate, the bump abuts the end face, and a distance L between the second connection portion and the insulating plate along the longitudinal direction of the end face is L, where L≧0.5 mm.

11. 2. The battery cell according to claim 1, wherein the tab includes multiple subtabs, and in two adjacent layers of the subtabs, a projection on the end surface of the subtab close to the electrode terminal covers a projection of the subtab away from the electrode terminal.

12. The battery cell according to claim 1 , wherein the first connection portion is bent relative to the second connection portion.

13. A battery comprising the battery cell of claim 1.

14. 10. A power consuming device comprising the battery cell of claim 1 for supplying electrical energy.

15. A battery cell, Housing and an electrode terminal installed in the housing; an electrode assembly accommodated in the housing, the electrode assembly including a main body and a tab, the tab extending from an end surface of the main body, the tab including a first connecting portion and a second connecting portion, the first connecting portion being used to connect to the electrode terminal, and the second connecting portion being connected to the main body; the first connecting portion extends at least partially beyond the second connecting portion along the longitudinal direction of the end surface; The first connection portion and the second connection portion are bent and installed in the longitudinal direction of the end surface, and the size of the first connection portion is smaller than the size of the second connection portion along the longitudinal direction of the end surface.

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