Battery monomer, battery device and electric device

Abstract

The utility model discloses a single battery, a battery device and a power utilization device, the single battery comprises a shell and an electrode assembly, the shell is provided with an accommodating cavity and a first wall, and the first wall is provided with a pressure relief mechanism; the electrode assembly is accommodated in the accommodating cavity, the electrode assembly comprises a main body part and tabs, and the tabs are arranged on at least one side of the main body part in the first direction; wherein a cutting part is arranged on the side, facing the pressure relief mechanism, of the tab in the second direction, the cutting part is used for avoiding the pressure relief mechanism, and the second direction intersects with the first direction. According to the scheme provided by the invention, the cutting part is arranged on the tab, and the cutting part can avoid the pressure relief mechanism, so that after the tab is connected with the first wall, the tab cannot interfere with the pressure relief mechanism on the first wall.

Description

Technical Field

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

[0002] As an important component in lithium-ion batteries, the battery tabs mainly serve as the contact points between the positive and negative electrodes during the charging and discharging process, responsible for conducting electrical energy from inside the battery.

[0003] In related technologies, the electrode tabs are prone to interference with the position of the explosion-proof valve on the top cover during assembly. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which can solve the problem that the tabs are prone to interference with the position of the explosion-proof valve on the top cover during assembly.

[0005] To address the aforementioned technical problems, in a first aspect, this application proposes a single battery cell, comprising:

[0006] The outer casing has a receiving cavity, and the outer casing has a first wall on which a pressure relief mechanism is provided;

[0007] An electrode assembly is housed within the receiving cavity. The electrode assembly includes a main body and an electrode tab, the electrode tab being disposed on at least one side of the main body along a first direction.

[0008] In this configuration, along the second direction, a cutting portion is provided on the side of the electrode facing the pressure relief mechanism. The cutting portion is used to avoid the pressure relief mechanism. The second direction intersects with the first direction.

[0009] In the technical solution of this application embodiment, by providing a cutting part on the electrode tab, the cutting part can avoid the pressure relief mechanism. In this way, when the electrode tab is connected to the first wall, the electrode tab will not interfere with the pressure relief mechanism on the first wall.

[0010] In some embodiments, the electrode tab is generally trapezoidal in structure, and the dimension of the electrode tab on the side facing the main body along the second direction is greater than the dimension of the electrode tab on the side away from the main body along the second direction.

[0011] The cutting portion is formed between the side of the electrode tab away from the main body along the first direction and the side of the electrode tab towards the pressure relief mechanism along the second direction.

[0012] Because the tabs are trapezoidal in shape, they have a larger overall area, which increases the conductive cross-sectional area of ​​the tabs, improves the charging and discharging efficiency of the battery, reduces internal resistance, and lowers heat generation.

[0013] In some embodiments, the electrode includes a first trapezoidal portion and a second trapezoidal portion, wherein the dimension of the first trapezoidal portion toward the main body portion along the second direction is greater than the dimension of the first trapezoidal portion toward the second trapezoidal portion along the second direction;

[0014] The first trapezoidal portion is connected to the main body portion, the second trapezoidal portion is connected to the side of the first trapezoidal portion away from the main body portion, and the cutting portion is provided on the side of the second trapezoidal portion facing the pressure relief mechanism.

[0015] In some embodiments, the first trapezoidal portion has an extension on the side facing the main body, and the dimension of the extension along the second direction is larger than the dimension of the first trapezoidal portion on the side facing the main body along the second direction. This increases the surface area of ​​the tab, improves heat dissipation, reduces the temperature rise caused by heat on the tab, and thus improves current carrying capacity.

[0016] In some embodiments, along the direction from the second trapezoidal portion to the main body portion, the dimensions of the first trapezoidal portion and the second trapezoidal portion gradually increase in the second direction. The increased area of ​​the tabs towards the main body portion helps to disperse current and reduce the risk of breakage of the main body portion due to stress concentration.

[0017] In some embodiments, along the second direction, the distance from the extension to the side of the main body is L3, wherein L3 ≥ 5 mm.

[0018] In some embodiments, the extension has an arc structure on both sides along the second direction.

[0019] In some embodiments, the length of the first trapezoidal portion toward the second trapezoidal portion along the second direction is L1, and the length of the overlapping portion of the cutting portion and the first trapezoidal portion toward the second trapezoidal portion along the second direction is L2, wherein L2 and L1 satisfy: 0.1≤L2:L1≤0.5.

[0020] In some embodiments, the second trapezoidal portion has a dimension of L4 along a third direction, the pressure relief mechanism has a radius of R1, and the weld mark formed by welding the second trapezoidal portion to the first wall has a dimension of L5 along a third direction. L4, L5, and R1 satisfy: 0.2≤L4:R1≤0.5, and L4<L5. The third direction intersects the plane formed by the first direction and the second direction.

[0021] In some embodiments, the corners of the trapezoidal structure along the second direction are all arc-shaped structures. This improves the swing stiffness and torsional stiffness of the tabs, thereby suppressing folding and insertion phenomena during electrode winding and improving the production yield of the electrochemical device.

[0022] Secondly, this application proposes a battery device comprising a battery cell as described in any one of the embodiments of this application.

[0023] Thirdly, this application proposes an electrical device, including a battery device as described in the embodiments of this application.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0027] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0028] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0030] Figure 5 This is a schematic diagram of the structure of another battery cell provided in some embodiments of this application.

[0031] The reference numerals in the detailed embodiments are as follows:

[0032] 1000, vehicles;

[0033] 100. Battery; 200. Controller; 300. Motor;

[0034] 110. Housing; 111. First part; 112. Second part; 120. Battery cell; 121. Housing; 122. End cap; 1221. Protrusion; 123. Electrode assembly;

[0035] 10. Main body; 11. Pole lug; 113. First trapezoidal part; 114. Second trapezoidal part; 1141. Cutting part; 12. Extension part; 13. Top cover; 14. Explosion-proof valve; 15. Weld mark. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0042] 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.

[0043] 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.

[0044] As an important component in lithium-ion batteries, the battery tabs mainly serve as the contact points between the positive and negative electrodes during the charging and discharging process, responsible for conducting electrical energy from inside the battery.

[0045] In related technologies, the continuous improvement of battery energy density and fast charging capability will cause the width of the tabs and the area of ​​the explosion-proof valve to increase. Since the area of ​​the battery top cover is limited, this will cause the tabs to interfere with the position of the explosion-proof valve on the battery top cover, making it inconvenient to install the tabs on the top cover.

[0046] Based on the above considerations, in order to solve the problem that the electrode tabs may easily interfere with the position of the explosion-proof valve on the top cover during assembly, a battery cell is designed. The battery cell includes a shell and an electrode assembly. The shell has a receiving cavity and a first wall, on which a pressure relief mechanism is provided. The electrode assembly is housed in the receiving cavity and includes a main body and an electrode tab. The electrode tab is disposed on at least one side of the main body along a first direction. Along a second direction, a cutting part is provided on the side of the electrode tab facing the pressure relief mechanism to avoid the pressure relief mechanism. The second direction intersects the first direction.

[0047] In the technical solution of this application embodiment, by providing a cutting part on the electrode tab, the cutting part can avoid the pressure relief mechanism. In this way, when the electrode tab is connected to the first wall, the electrode tab will not interfere with the pressure relief mechanism on the first wall.

[0048] In this application, "battery" refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. Batteries can serve as a power source or power system for electrical devices, which helps improve the overall performance of the battery and facilitates its widespread adoption.

[0049] The aforementioned electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0050] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0051] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0052] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0053] Please refer to Figure 2 , Figure 2This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 110 and a battery cell 120, with the battery cell 120 housed within the housing 110. The housing 110 provides a accommodating space for the battery cell 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and together define a accommodating space for accommodating the battery cell 120. The second portion 112 may be a hollow structure with one open end, and the first portion 111 may be a plate-like structure, with the first portion 111 covering the open side of the second portion 112 so that the first portion 111 and the second portion 112 together define the accommodating space; alternatively, the first portion 111 and the second portion 112 may both be hollow structures with one open side, with the open side of the first portion 111 covering the open side of the second portion 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be of various shapes, such as cylinder, cuboid, etc.

[0054] In battery 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within housing 110. Alternatively, battery 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 110. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrical connection between multiple battery cells 120.

[0055] Each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 120 can be cylindrical, flat, cuboid, or other shapes.

[0056] like Figure 3 As shown, the battery cell 120 may include a housing, an electrode assembly 123, and electrode terminals. The housing includes a casing 121 and an end cap 122. The casing 121 has an opening, and the end cap 122 closes the opening to isolate the internal environment of the battery cell 120 from the external environment.

[0057] The housing 121 is an assembly used to cooperate with the end cap 122 to form the internal environment of the battery cell 120, wherein the formed internal environment can accommodate the electrode assembly 123, electrolyte, and other components. The housing 121 and the end cap 122 can be independent components. The housing 121 can have various shapes and sizes. Specifically, the shape of the housing 121 can be determined according to the specific shape and size of the electrode assembly 123. The housing 121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0058] End cap 122 refers to a component that covers the opening of housing 121 to isolate the internal environment of battery cell 120 from the external environment. The shape of end cap 122 can be adapted to the shape of housing 121 to fit it. Optionally, end cap 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 122 is not easily deformed under pressure and impact, giving battery cell 120 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 122. Electrode terminals can be used for electrical connection with electrode assembly 123 to output or input electrical energy to battery cell 120. The material of end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may also be provided on the inner side of the end cap 122. The insulating structure can be used to isolate the electrical connection components within the housing 121 from the end cap 122 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0059] Electrode assembly 123 is the component in the battery cell 120 where electrochemical reactions occur. The housing 121 may contain one or more electrode assemblies 123. The electrode assembly 123 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 123, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop. Furthermore, the electrode assembly 123 can be a wound structure or a stacked structure.

[0060] In some embodiments, the battery cell 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold.

[0061] According to some embodiments of this application, Figure 4 This is a schematic diagram of the structure of a single battery cell in this application. Figure 5 This is a schematic diagram of the structure of another battery cell in this application. Figure 4 and Figure 5 As shown, this application provides a battery cell, which includes a housing and an electrode assembly. The housing has a receiving cavity and a first wall. A pressure relief mechanism is disposed on the first wall and housed within the receiving cavity. The electrode assembly includes a main body and tabs. The tabs are disposed on at least one side of the main body along a first direction. Along a second direction, a cutting portion 1141 is disposed on the side of the tab facing the pressure relief mechanism. The cutting portion 1141 is used to avoid the pressure relief mechanism. The second direction intersects the first direction.

[0062] refer to Figure 3 As shown, in this embodiment, the first direction is the X-axis direction and the second direction is the Y-axis direction. The angle between the X-axis and the Y-axis can be 85°, 90°, etc. In this embodiment, the X-axis and the Y-axis are perpendicular to each other as an example for explanation.

[0063] In this embodiment, the outer shell can refer to the structure of the shell 121 described above, the first wall can be the top cover 13, and the main body can be formed by winding or stacking positive and negative electrode plates. The specific details can be determined according to the actual situation, and this embodiment does not limit this.

[0064] The pressure relief mechanism in this embodiment includes an explosion-proof valve 14, which is fixed on the top cover 13. When the top cover 13 is installed on the outer shell, the electrode 11 is simultaneously connected to the electrode post on the top cover 13. Alternatively, the electrode 11 is connected to the electrode post on the top cover 13 through a conductive sheet. The specific connection can be determined according to the actual situation, and this embodiment does not limit the connection.

[0065] In this embodiment, the main body can be a positive electrode or a negative electrode. The end of the tab 11 near the positive electrode is connected to the positive electrode. This connection can be integrally formed, bonded, welded or other fixing methods, as long as the connection and fixing of the tab 11 and the positive electrode can be achieved. No limitation is made here.

[0066] refer to Figure 5 As shown, in this embodiment, a cutting part 1141 is provided on the side of the electrode 11 facing the explosion-proof valve 14. When the electrode 11 is connected to the top cover 13, the cutting part 1141 can avoid the explosion-proof valve 14. In this way, the electrode 11 will not interfere with the explosion-proof valve 14 on the top cover 13.

[0067] According to some embodiments of this application, such as Figure 5As shown, the electrode 11 has a trapezoidal structure. The dimension of the electrode 11 on the side facing the main body 10 along the second direction is larger than the dimension of the electrode 11 on the side away from the main body 10 along the second direction. At the same time, a cutting portion 1141 is formed between the side of the electrode 11 away from the main body 10 along the first direction and the side of the electrode 11 facing the pressure relief mechanism along the second direction.

[0068] The first and second directions in this embodiment can be referred to the description above, and will not be repeated here.

[0069] In this embodiment, the height of the weld mark 15 formed by welding the tab 11 and the top cover 13 is L5. The weld mark 15 is a square structure, and the weld mark 15 is relatively long along the Y-axis to ensure that the tab 11 and the top cover 13 can be stably connected together.

[0070] When the tab 11 is connected to the top cover 13, the weld mark 15 ensures that the top cover 13 is wider in the Y-axis direction. This increases the conductive cross-sectional area of ​​the tab 11, improves the charging and discharging efficiency of the battery, reduces internal resistance, and reduces heat generation.

[0071] According to some embodiments of this application, such as Figure 5 As shown, the tab 11 includes a first trapezoidal portion 113 and a second trapezoidal portion 114. The dimension of the first trapezoidal portion 113 facing the main body portion 10 along the second direction is larger than the dimension of the first trapezoidal portion 113 facing the second trapezoidal portion 114 along the second direction.

[0072] The first trapezoidal portion 113 is connected to the main body portion 10, and the second trapezoidal portion 114 is connected to the side of the first trapezoidal portion 113 away from the main body portion 10. The second trapezoidal portion 114 is provided with a cutting portion 1141 on the side facing the pressure relief mechanism.

[0073] The second direction and pressure relief mechanism in this embodiment can be referred to the above description, and will not be repeated here.

[0074] In this embodiment, a cutting part 1141 is provided on the side of the second trapezoidal part 114 facing the explosion-proof valve 14. After the electrode 11 is welded to the top cover 13, the cutting part 1141 can avoid the explosion-proof valve 14. In this way, the electrode 11 will not interfere with the explosion-proof valve 14 on the top cover 13.

[0075] According to some embodiments of this application, such as Figure 4 or Figure 5 As shown, an extension 12 is provided on the side of the first trapezoidal portion 113 facing the main body portion 10, and the dimension of the extension 12 along the second direction is larger than the dimension of the first trapezoidal portion 113 on the side facing the main body portion 10 along the second direction.

[0076] This increases the overall surface area of ​​the tab 11, improves heat dissipation, reduces the temperature rise caused by the tab 11 being heated, and thus improves the current carrying capacity.

[0077] According to some embodiments of this application, such as Figure 4 or Figure 5 As shown, along the direction from the second trapezoidal portion 114 to the main body portion 10, the dimensions of the first trapezoidal portion 113 and the second trapezoidal portion 114 gradually increase in the second direction.

[0078] The second direction in this embodiment can be referred to the description above, and will not be repeated here.

[0079] refer to Figure 4 As shown, in this embodiment, the second trapezoidal portion 114 and the first trapezoidal portion 113 gradually increase in size along the Y-axis direction from top to bottom. That is, the area of ​​the electrode tab 11 facing the main body portion 10 gradually increases. This helps to disperse the current and reduce the risk of breakage of the main body portion 10 due to stress concentration.

[0080] According to some embodiments of this application, such as Figure 5 As shown, along the second direction, the distance from the extension 12 to the side of the main body 10 is L3, where L3 ≥ 5 mm.

[0081] The second direction in this embodiment can be referred to the description above, and will not be repeated here.

[0082] In this embodiment, by limiting the distance L3 between the extension portion 12 and the main body portion 10, the extension portion 12 is prevented from extending to the side of the main body portion 10 in the Y-axis direction. In this way, when the tab 11 is connected to the top cover 13, the extension portion 12 will not come into contact with the inner wall of the top cover 13.

[0083] According to some embodiments of this application, the extension 12 has an arc structure on both sides along the second direction.

[0084] The second direction in this embodiment can be referred to the description above, and will not be repeated here.

[0085] Since both sides of the extension 12 along the Y-axis are arc structures, the swing stiffness and torsional stiffness of the tab can be improved, thereby suppressing the tab from folding or inserting during the electrode winding process and improving the production yield of the electrochemical device.

[0086] According to some embodiments of this application, such as Figure 5As shown, the length of the first trapezoidal portion 113 facing the second trapezoidal portion 114 along the second direction is L1, and the length of the overlapping portion of the cutting portion 1141 and the first trapezoidal portion 113 facing the second trapezoidal portion 114 along the second direction is L2, wherein L2 and L1 satisfy: 0.1≤L2:L1≤0.5. This avoids making the overall tab 11 too small, ensuring the welding area of ​​the tab 11, and thus meeting the current carrying capacity requirements of the tab 11.

[0087] It should be noted that L2:L1 can also be 0.55:1, 0.58:1, etc., and the specific ratio can be determined according to the actual situation. This specification does not limit this in the embodiments.

[0088] According to some embodiments of this application, such as Figure 5 As shown, the second trapezoidal part 114 has a dimension of L4 along the third direction, the radius of the pressure relief mechanism is R1, and the weld mark 15 formed by welding the second trapezoidal part 114 and the first wall has a dimension of L5 along the third direction. Among them, L4, L5 and R1 satisfy: 0.2≤L4:R1≤0.5, and L4<L5. The third direction intersects the plane formed by the first direction and the second direction.

[0089] In this embodiment, the third direction is as follows: Figure 3 The Z-axis direction is perpendicular to the plane formed by the X and Y axes.

[0090] The pressure relief mechanism and the structure of the first wall in this embodiment can be referred to the above description, and will not be repeated here.

[0091] This embodiment, by limiting the dimensional relationship between L4, L5, and R1, avoids the overall size of the tab 11 being too small, ensuring the welding area of ​​the tab 11 and thus meeting the current carrying capacity of the tab 11. At the same time, limiting L4 to L5 avoids the dimension of L4 being too large in the Z-axis direction.

[0092] It should be noted that L4:R1 can also be 0.56:1, 0.59:1, etc., and the specific ratio can be determined according to the actual situation. This specification does not limit this in the embodiments.

[0093] According to some embodiments of this application, the corners of the trapezoidal structure along the second direction are all arc-shaped structures.

[0094] The second direction in this embodiment can be referred to the description above, and will not be repeated here.

[0095] In this embodiment, the corner includes the intersection of the first trapezoidal portion 113, the second trapezoidal portion 114, and the extension portion 12.

[0096] refer to Figure 4As shown, the chamfer size of the second trapezoidal portion 114 at the corner in the Y-axis direction can be R4 or R5, the chamfer size of the first trapezoidal portion 113 at the corner in the Y-axis direction can be R8 or R9, and the chamfer size of the extension portion 12 on both sides in the Y-axis direction can be R11 or R12. The specific size can be determined according to the actual situation, and this specification does not limit it in this embodiment.

[0097] Since the trapezoidal structure has arc-shaped corners in the Y-axis direction, the swing stiffness and torsional stiffness of the tab 11 can be improved, thereby suppressing the tab from folding or inserting during the electrode winding process, reducing the risk of the tab 11 tearing at the side, and improving the production yield of the electrochemical device.

[0098] This application also provides a battery device, including a battery cell as described in any of the embodiments of this application.

[0099] The battery cell of this embodiment includes a housing and an electrode assembly. The housing has a receiving cavity and a first wall, on which a pressure relief mechanism is provided. The electrode assembly is housed in the receiving cavity and includes a main body and a tab. The tab is provided on at least one side of the main body along a first direction. Along a second direction, a cutting portion is provided on the side of the tab facing the pressure relief mechanism to avoid the pressure relief mechanism. The second direction intersects the first direction.

[0100] In the technical solution of this application embodiment, by providing a cutting part on the electrode tab, the cutting part can avoid the pressure relief mechanism. In this way, when the electrode tab is connected to the first wall, the electrode tab will not interfere with the pressure relief mechanism on the first wall.

[0101] In this embodiment, since the battery device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0102] This application also provides an electrical device, including a battery device as described in any of the embodiments of this application.

[0103] The specific structure of the battery device in this embodiment refers to the above embodiments. Since the power device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has a receiving cavity, and the outer casing has a first wall on which a pressure relief mechanism is provided; An electrode assembly is housed within the receiving cavity. The electrode assembly includes a main body and an electrode tab, the electrode tab being disposed on at least one side of the main body along a first direction. In this configuration, along the second direction, a cutting portion is provided on the side of the electrode facing the pressure relief mechanism. The cutting portion is used to avoid the pressure relief mechanism. The second direction intersects with the first direction.

2. The battery cell according to claim 1, characterized in that, The electrode tab is generally trapezoidal in shape, and the dimension of the electrode tab on the side facing the main body along the second direction is greater than the dimension of the electrode tab on the side away from the main body along the second direction. The cutting portion is formed between the side of the electrode tab away from the main body along the first direction and the side of the electrode tab towards the pressure relief mechanism along the second direction.

3. The battery cell according to claim 2, characterized in that, The electrode includes a first trapezoidal portion and a second trapezoidal portion, wherein the dimension of the first trapezoidal portion facing the main body portion along the second direction is greater than the dimension of the first trapezoidal portion facing the second trapezoidal portion along the second direction; The first trapezoidal portion is connected to the main body portion, the second trapezoidal portion is connected to the side of the first trapezoidal portion away from the main body portion, and the cutting portion is provided on the side of the second trapezoidal portion facing the pressure relief mechanism.

4. The battery cell according to claim 3, characterized in that, An extension is provided on the side of the first trapezoidal portion facing the main body portion, and the dimension of the extension along the second direction is greater than the dimension of the first trapezoidal portion on the side facing the main body portion along the second direction.

5. The battery cell according to claim 3, characterized in that, Along the direction from the second trapezoidal portion to the main body portion, the dimensions of the first trapezoidal portion and the second trapezoidal portion along the second direction gradually increase.

6. The battery cell according to claim 4, characterized in that, Along the second direction, the distance from the extension to the side of the main body is L3, where L3 ≥ 5 mm.

7. The battery cell according to claim 4, characterized in that, The extension has an arc structure on both sides along the second direction.

8. The battery cell according to any one of claims 3 to 7, characterized in that, The length of the first trapezoidal portion facing the second trapezoidal portion along the second direction is L1, and the length of the overlapping portion of the cutting portion and the first trapezoidal portion facing the second trapezoidal portion along the second direction is L2, wherein L2 and L1 satisfy: 0.1≤L2:L1≤0.

5.

9. The battery cell according to claim 8, characterized in that, The second trapezoidal portion has a dimension of L4 along the third direction, the pressure relief mechanism has a radius of R1, and the weld mark formed by welding the second trapezoidal portion to the first wall has a dimension of L5 along the third direction. L4, L5 and R1 satisfy: 0.2≤L4:R1≤0.5, and L4<L5. The third direction intersects the plane formed by the first direction and the second direction.

10. The battery cell according to any one of claims 2 to 6, characterized in that, The corners of the trapezoidal structure along the second direction are all arc-shaped structures.

11. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

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