Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell and an electrode assembly, and the electrode assembly is arranged in the shell. Wherein the shell comprises a first shell part and a second shell part which are connected along a first direction, and the inner wall of the first shell part and the electrode assembly are arranged at an interval along a second direction; the distance between the two opposite side walls of the first shell part in the second direction is a first distance. The second shell part comprises a first part and a second part which are oppositely arranged in the second direction, and the distance between the first part and the second part is smaller than the first distance in the second direction; the first direction and the second direction intersect each other. After the electrode assembly is assembled into the shell, the first part and the second part of the second shell part can be used for limiting the movement of the electrode assembly in the second direction, so that the possibility that the electrode assembly moves or inclines in the shell can be reduced, and the improvement of the reliability of the battery monomer is facilitated.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, to address environmental issues, gasoline prices, and energy storage challenges, battery applications have rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is an urgent problem to be solved. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, a battery device, and an electrical device to address the above technical problems.

[0005] According to a first aspect of this application, a battery cell is provided, including a housing and an electrode assembly, the electrode assembly being disposed within the housing. The housing includes a first housing portion and a second housing portion connected along a first direction; along a second direction, the inner wall of the first housing portion is spaced apart from the electrode assembly; the distance between two opposite sidewalls of the first housing portion along the second direction is a first distance. The second housing portion includes a first part and a second part disposed opposite each other along the second direction; along the second direction, the distance between the first part and the second part is less than the first distance; the first direction and the second direction intersect each other.

[0006] In the technical solution of this application, since the first housing part and the electrode assembly are spaced apart, it is convenient for the electrode assembly to be assembled into the housing. Thus, the electrode assembly can be respectively entered into the first housing part and the second housing part. Since the distance between the first part and the second part of the second housing part is smaller than the distance between the two side walls of the first housing that are arranged opposite each other along the second direction, the distance between the first part and the second part of the second housing part is smaller. Therefore, after the electrode assembly is assembled into the housing, the first part and the second part of the second housing part can be used to restrict the movement of the electrode assembly along the second direction, thereby reducing the possibility of the electrode assembly moving or tilting inside the housing, which is beneficial to improving the reliability of the battery cell.

[0007] In one embodiment, along the second direction, the inner wall of the second housing portion abuts against the electrode assembly.

[0008] In this way, after the electrode assembly is assembled into the housing, the movement of the electrode assembly can be better restricted by the second housing part, thereby reducing the possibility of the electrode assembly moving or tilting inside the housing, which is conducive to improving the reliability of the battery cell.

[0009] In one embodiment, the electrode assembly is interference-fitted between the first portion and the second portion.

[0010] This increases the binding effect of the second housing on the electrode assembly, thereby better utilizing the second housing to restrict the movement of the electrode assembly, which in turn reduces the possibility of the electrode assembly moving or tilting inside the housing, thus improving the reliability of the battery cell.

[0011] In one embodiment, the minimum thickness of at least one of the first portion and the second portion is greater than the maximum thickness of the first housing portion.

[0012] By utilizing at least one of the first and second portions, which has a thickness greater than that of the first housing portion, the distance between the second housing portion and the electrode assembly along the second direction can be reduced. Furthermore, by utilizing the portion of the second housing portion that has a thickness greater than that of the first housing portion, the movement of the electrode assembly along the second direction can be restricted, thereby reducing the possibility of the electrode assembly moving or tilting inside the housing, which is beneficial to improving the reliability of the battery cell.

[0013] In one embodiment, the thickness of the first housing portion is 0.01mm-3mm.

[0014] Setting the thickness of the first housing part within a suitable range is beneficial for ensuring that the first housing part has a certain thickness, while also improving the space utilization rate within the first housing part while keeping the outer contour dimensions of the housing unchanged.

[0015] And / or, the thickness of at least one of the first part and the second part is 0.01mm-5mm.

[0016] Setting the thickness of the first and second parts of the second housing portion within a suitable range is beneficial for ensuring that the second housing portion has a certain thickness, while also improving the space utilization rate within the second housing portion without changing the outer contour dimensions of the housing.

[0017] In one embodiment, the housing further includes a third housing portion connected between the first housing portion and the second housing portion along a first direction. The minimum thickness of the third housing portion is greater than or equal to the thickness of the first housing portion, and the maximum thickness of the third housing portion is less than or equal to the maximum thickness of the second housing portion.

[0018] It is understandable that the thickness of the shell tends to increase along the direction from the first shell portion to the second shell portion. This facilitates entry into the shell from the thinner portion and allows the thicker portion to restrict the movement of the electrode assembly along the second direction. Furthermore, the increasing thickness of the shell along the direction from the first shell portion to the second shell portion also helps to improve the toughness and strength of the shell.

[0019] In one embodiment, the thickness of at least a portion of the third housing portion gradually increases along the direction from the first housing portion to the second housing portion.

[0020] This allows at least a portion of the casing to gradually increase in thickness, which is beneficial for improving the casing's toughness and strength, as well as the reliability of the individual battery cells. Furthermore, the gradually decreasing gap between the third casing portion and the electrode assembly improves the ease of inserting the electrode assembly into the casing.

[0021] In one embodiment, the housing has a receiving cavity for accommodating electrode assemblies, and the housing has a fluid channel communicating with the receiving cavity, the fluid channel being at least located on the inner wall of the second housing portion. The battery cell also includes a pressure relief mechanism, which is located on the side of the second housing portion away from the first housing portion along a first direction. When the pressure in the receiving cavity is greater than or equal to a preset value, the fluid channel can communicate with the external environment by means of the pressure relief mechanism.

[0022] In this way, the second housing portion can be used to restrict the movement of the electrode assembly in the second direction, while also allowing the gas generated inside the battery cell to be discharged outward through the fluid channel, thereby improving the reliability and safety of the battery cell.

[0023] In one embodiment, a fluid channel is recessed at least in the inner wall of the second housing portion, and extends along the second housing portion from one side near the first housing portion to the other. This allows for efficient use of the fluid channel and pressure relief mechanism to release gas generated within the battery cell, reducing the likelihood of gas accumulating between the first housing portion and the electrode assembly or between the third housing portion and the electrode assembly, thereby improving the safety of the battery cell.

[0024] Alternatively, the fluid channel is recessed into the inner walls of the second and third housing portions, and extends through the third housing portion from one end away from the second housing portion to the other end of the second housing portion from the third housing portion. In this way, gas generated within the battery cell can be quickly discharged through the fluid channel to the side of the battery cell where the pressure relief mechanism is located, reducing the possibility of gas accumulating between the first housing portion and the electrode assembly, thereby improving the safety of the battery cell.

[0025] In one embodiment, fluid channels are provided on opposite sides of the second housing portion along the second direction.

[0026] In this way, the gas generated inside the battery cell can be discharged more quickly through the fluid channels on both sides to the side of the battery cell where the pressure relief mechanism is installed, thereby improving the safety of the battery cell.

[0027] In one embodiment, a first groove is provided on the inner wall of the second housing portion, and a second groove is provided on the inner wall of the third housing portion. The first groove and the second groove are in communication with each other to form a fluid channel.

[0028] Therefore, the gas generated inside the battery cell can be quickly discharged through the fluid channel to the side of the battery cell where the pressure relief mechanism is located, reducing the possibility of gas accumulating between the first housing and the electrode assembly, thereby improving the safety of the battery cell.

[0029] In one embodiment, the second housing portion has at least one first groove on each of its opposite sides along the second direction, and the third housing portion has at least one second groove on each of its opposite sides along the second direction. The first grooves and the corresponding second grooves are connected in a one-to-one correspondence to form a fluid channel.

[0030] In this way, the gas generated inside the battery cell can be discharged more quickly to the side of the battery cell where the pressure relief mechanism is set through multiple fluid channels, thereby improving the safety of the battery cell.

[0031] In one embodiment, the thickness of the first housing portion is a first thickness, and the maximum thickness of the portion of the second housing portion having the first groove is a second thickness, wherein the first thickness is less than the second thickness, and the groove depth of the first groove is less than or equal to the difference between the second thickness and the first thickness.

[0032] In this way, while meeting the venting requirements of the battery cells by utilizing the fluid channel, the second housing part can also have a certain thickness, that is, the thickness of the second housing part is greater than or equal to the thickness of the first housing part, which can improve the reliability of the second housing part and the battery cells.

[0033] And / or, the thickness of the first housing portion is a first thickness, and the maximum thickness of the portion of the third housing portion having the second groove is a third thickness, wherein the first thickness is less than the third thickness; and the groove depth of the second groove is less than or equal to the difference between the third thickness and the first thickness.

[0034] In this way, while utilizing the fluid channel to meet the venting requirements of the battery cell, the third housing part can also have a certain thickness, that is, the thickness of the third housing part is greater than or equal to the thickness of the first part, which can improve the reliability of the third housing part and the battery cell.

[0035] In one embodiment, the dimension of the first housing portion along the first direction is a first dimension, the dimension of the second housing portion along the first direction is a second dimension, and the dimension of the third housing portion along the first direction is a third dimension. The first dimension is larger than the second dimension and larger than the third dimension.

[0036] Thus, since the first housing portion is longer in the first direction, the ease of housing the electrode assembly can be improved.

[0037] In one embodiment, the second dimension is larger than the third dimension.

[0038] In this way, the ease of inserting the electrode assembly into the housing can be improved, and the second housing portion can be used to better restrict the movement of the electrode assembly along the second direction. This can further reduce the possibility of the electrode assembly moving or tilting inside the housing, thereby improving the reliability of the battery cell.

[0039] In one embodiment, the dimension of the first housing portion along the first direction is a first dimension, the dimension of the second housing portion along the first direction is a second dimension, and the dimension of the housing along the first direction is L. The first dimension is 0.6×L-0.9×L, and the second dimension is 0.15×L-0.3×L.

[0040] Setting the dimensions of the first housing portion along the first direction within a suitable range, and setting the dimensions of the second housing portion along the first direction within a suitable range, not only improves the ease of inserting the electrode assembly into the housing, but also effectively utilizes the second housing portion to restrict the movement of the electrode assembly along the second direction. This further reduces the possibility of the electrode assembly moving or tilting inside the housing, thereby improving the reliability of the battery cell.

[0041] In one embodiment, the electrode assembly includes an electrical isolator and an electrode assembly. The electrical isolator is disposed within a housing. Along a second direction, the electrical isolator is spaced apart from the inner wall of the first housing portion and abuts against the inner wall of the second housing portion. At least a portion of the electrode assembly is disposed within the electrical isolator.

[0042] In this way, the electrode assembly can be electrically isolated from the housing by the electrical isolation component, and the movement of the electrode assembly in the second direction can be restricted by the second housing part. This reduces the possibility of the electrode assembly moving or tilting inside the housing, and also reduces the occurrence of electrode damage or tab tearing, thereby improving the reliability of the battery cell.

[0043] In one embodiment, the housing has a receiving cavity for accommodating an electrode assembly, and the housing has an opening communicating with the receiving cavity, the opening being at least located on the side of the first housing portion away from the second housing portion.

[0044] Since the opening is located at least on the side of the first housing portion away from the second housing portion, the electrode assembly can be easily inserted into the housing through the opening in the direction from the first housing portion to the second housing portion, thereby improving the ease of inserting the electrode assembly into the housing.

[0045] According to a second aspect of this application, a battery device is provided, comprising a battery cell of any of the above embodiments.

[0046] According to a third aspect of this application, an electrical device is provided, including the battery device described above.

[0047] 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

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0050] Figure 2 An exploded schematic diagram of a battery cell according to an embodiment of this application is shown.

[0051] Figure 3 A schematic diagram of the housing structure in one embodiment of this application is shown.

[0052] Figure 4 A schematic cross-sectional view of the housing in a direction perpendicular to a third party is shown in one embodiment of this application.

[0053] Figure 5 A schematic cross-sectional view of the housing in a first direction according to an embodiment of this application is shown.

[0054] Reference numerals: 1. Vehicle; 10. Battery assembly; 100. Battery cell; 110. Housing; 111. First housing portion; 112. Second housing portion; 1121. First part; 1122. Second part; 113. Third housing portion; C1. First groove; C2. First groove; T. Fluid channel; R. Receiving cavity; K. Opening; 120. Electrode assembly; 121. Electrical separator; 122. Electrode assembly; 130. Pressure relief mechanism; 140. First cover; 150. Second cover; 20. Motor; 30. Controller. Detailed Implementation

[0055] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0056] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0057] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0061] Batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, to address environmental issues, gasoline prices, and energy storage challenges, battery applications have rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0062] In related technologies, the casing of a battery cell is usually designed with a uniform wall thickness. In order to facilitate the insertion of the electrode assembly into the casing, the electrode assembly needs to be spaced apart from the casing. This makes the electrode assembly prone to tipping or moving inside the casing, which can lead to damage to the electrode plates or tearing of the electrode tabs. Consequently, the reliability of the battery cell in related technologies is low.

[0063] To address the aforementioned technical problems, this application presents a battery cell, a battery device, and an electrical appliance designed to improve the reliability of the battery cell.

[0064] The battery cells and / or battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. These electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. The power system of this electrical equipment can be composed using the battery cells and / or battery devices disclosed in this application, which facilitates providing power to the equipment and extends its service life.

[0065] Figure 1 This illustration shows a structural diagram of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0066] The interior of vehicle 1 may also be equipped with a motor 20 and a controller 30. The controller 30 is used to control the power supply of the battery device 10 to the motor 20, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0067] The battery device 10 may include a single battery cell 100, or it may include multiple battery cells 100, which are electrically connected in series, parallel or mixed (mixed connection refers to a combination of series and parallel connection).

[0068] Figure 2 An exploded schematic diagram of a single battery cell according to an embodiment of this application is shown. Figure 3 A schematic diagram of the housing structure in one embodiment of this application is shown.

[0069] Please refer to the following: Figure 2 and Figure 3 One embodiment of this application provides a battery cell 100, including a housing 110 and an electrode assembly 120, wherein the electrode assembly 120 is disposed within the housing 110.

[0070] The housing 110 refers to the component on the battery cell 100 used to house the electrode assembly 120.

[0071] The electrode assembly 120 typically includes a first electrode, a separator, and a second electrode. The first electrode, the separator, and the second electrode can be stacked, or they can be wound around a preset axis to form a wound body. No specific restrictions are imposed here.

[0072] The housing 110 includes a first housing portion 111 and a second housing portion 112 connected along a first direction F1. Along a second direction F2, the inner wall of the first housing portion 111 is spaced apart from the electrode assembly 120, and the distance between the two opposite side walls of the first housing portion 111 along the second direction F2 is a first distance.

[0073] The second housing portion 112 includes a first portion 1121 and a second portion 1122 disposed opposite to each other along the second direction F2, wherein the distance between the first portion 1121 and the second portion 1122 along the second direction F2 is smaller than the first distance.

[0074] The first direction F1 and the second direction F2 intersect each other.

[0075] The first housing portion 111 refers to the portion of the housing 110 that is spaced apart from the electrode assembly 120 along the second direction F2.

[0076] The second housing portion 112 refers to the portion of the housing 110 used to restrict the movement of the electrode assembly 120 along the second direction F2.

[0077] The first part 1121 and the second part 1122 refer to two parts on the second housing 112 that are arranged opposite each other along the second direction F2.

[0078] The first direction F1 can be perpendicular to the second direction F2. For example, the first direction F1 is parallel to the length direction of the housing 110, and the second direction F2 is parallel to the height direction of the housing 110.

[0079] On the one hand, since the first housing portion 111 and the electrode assembly 120 are spaced apart along the second direction F2, it is convenient for the electrode assembly 120 to be assembled into the housing, and thus the electrode assembly 120 can be inserted into the first housing portion 111 and the second housing portion 112 respectively. On the other hand, since the distance between the first part 1121 and the second part 1122 of the second housing portion 112 is smaller than the distance between the two side walls of the first housing portion 111 that are arranged opposite each other along the second direction F2, the distance between the first part 1121 and the second part 1122 of the second housing portion 112 is smaller. Therefore, after the electrode assembly 120 is assembled into the housing, the first part 1121 and the second part 1122 of the second housing portion 112 can be used to restrict the movement of the electrode assembly 120 along the second direction F2, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, and also reducing the occurrence of electrode damage or electrode tab tearing, which is conducive to improving the reliability of the battery cell 100.

[0080] It is understood that the thickness of the first housing portion 111 is less than the thickness of at least a portion of the second housing portion 112, and the portion of the second housing portion 112 with a thickness greater than that of the first housing portion 111 can restrict the movement of the electrode assembly 120 along the second direction F2, that is, the first portion 1121 and the second portion 1122 can be used to restrict the movement of the electrode assembly 120 along the second direction F2.

[0081] It should be noted that the dimensions of the electrode assembly 120 remain unchanged along the first direction F1 and along the second direction F2.

[0082] The dimension of the electrode assembly 120 along the second direction F2 is the width of the electrode assembly 120. Typically, electrode assemblies 120 of equal width are provided inside the housing 110. This allows the first housing portion 111 and the electrode assembly 120 to be spaced apart along the second direction F2, while the portion of the second housing portion 112 with a thickness greater than that of the first housing portion 111 can be used to restrict the movement of the electrode assembly 120 along the second direction F2.

[0083] In some embodiments, along the second direction F2, the inner wall of the second housing portion 112 abuts against the electrode assembly 120.

[0084] Thus, after the electrode assembly 120 is assembled into the housing, the second housing portion 112 can be used to better restrict the movement of the electrode assembly 120, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, which in turn helps to improve the reliability of the battery cell 100.

[0085] In some embodiments, the electrode assembly 120 is interference-fitted between the first portion 1121 and the second portion 1122.

[0086] In this way, the binding effect of the second housing portion 112 on the electrode assembly 120 can be increased, thereby better utilizing the second housing portion 112 to restrict the movement of the electrode assembly 120, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, which is conducive to improving the reliability of the battery cell 100.

[0087] In some embodiments, the minimum thickness of at least one of the first portion 1121 and the second portion 1122 is greater than the maximum thickness of the first housing portion 111.

[0088] It is permissible that the thickness of one of the first portion 1121 and the second portion 1122 is equal to the thickness of the first housing portion 111, and the thickness of the other of the first portion 1121 and the second portion 1122 is greater than the thickness of the first housing portion 111. Alternatively, it is permissible that both the thickness of the first portion 1121 and the thickness of the second portion 1122 are greater than the thickness of the first housing portion 111. No specific limitations are imposed here.

[0089] By utilizing at least one of the first portion 1121 and the second portion 1122, whose thickness is greater than that of the first housing portion 111, the distance between the second housing portion 112 and the electrode assembly 120 along the second direction F2 can be reduced. In turn, the portion of the second housing portion 112 with a thickness greater than that of the first housing portion 111 can be used to restrict the movement of the electrode assembly 120 along the second direction F2, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, which is beneficial to improving the reliability of the battery cell 100.

[0090] In some embodiments, the thickness of the first housing portion 111 is 0.01 mm to 3 mm.

[0091] For example, the thickness of the first housing portion 111 is 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm or 3 mm.

[0092] Setting the thickness of the first housing portion 111 within a suitable range is beneficial for ensuring that the first housing portion 111 has a certain thickness, and also improves the space utilization rate within the first housing portion 111 while keeping the outer contour dimensions of the housing 110 unchanged.

[0093] In some embodiments, at least one of the first portion 1121 and the second portion 1122 has a thickness of 0.01 mm to 5 mm.

[0094] It is possible that the thickness of one of the first part 1121 and the second part 1122 is 0.01mm-5mm, or it is possible that the thickness of both the first part 1121 and the second part 1122 is 0.01mm-5mm.

[0095] For example, the thickness of the first part 1121 and the second part 1122 of the second housing part 112 is 0.01mm, 0.06mm, 0.2mm, 0.6mm, 1.1mm, 2.1mm, 3.1mm, 4mm or 5mm.

[0096] Setting the thickness of the first part 1121 and the second part 1122 of the second housing part 112 within a suitable range is beneficial to ensure that the second housing part 112 has a certain thickness, and can improve the space utilization rate within the second housing part 112 while keeping the outer contour dimensions of the housing 110 unchanged.

[0097] In some embodiments, the housing 110 further includes a third housing portion 113 connected between the first housing portion 111 and the second housing portion 112 along a first direction F1, wherein the minimum thickness of the third housing portion 113 is greater than or equal to the thickness of the first housing portion 111, and the maximum thickness of the third housing portion 113 is less than or equal to the maximum thickness of the second housing portion 112.

[0098] The third housing portion 113 refers to the portion of the housing 110 that connects between the first housing portion 111 and the second housing portion 112.

[0099] For example, the minimum thickness of the third housing portion 113 is equal to the thickness of the first housing portion 111, and the maximum thickness of the third housing portion 113 is equal to the thickness of the first portion 1121 of the second housing portion 112, and also equal to the thickness of the second portion 1122 of the second housing portion 112.

[0100] Since the minimum thickness of the third housing portion 113 is greater than or equal to the thickness of the first housing portion 111, and the maximum thickness of the third housing portion 113 is less than or equal to the maximum thickness of the second housing portion 112, the thickness of the housing 110 tends to increase along the direction from the first housing portion 111 to the second housing portion 112. This facilitates insertion from the thinner portion of the housing 110 and allows the thicker portion of the housing 110 to restrict the movement of the electrode assembly 120 along the second direction F2. Furthermore, the increasing thickness of the housing 110 along the direction from the first housing portion 111 to the second housing portion 112 also helps to improve the toughness and strength of the housing 110.

[0101] In some embodiments, the thickness of at least a portion of the third housing portion 113 gradually increases along the direction from the first housing portion 111 to the second housing portion 112.

[0102] It is possible that the thickness of the third housing portion 113 gradually increases along the direction from the first housing portion 111 to the second housing portion 112; or it is possible that the thickness of the sidewall of the third housing portion 113 along at least one side of the second direction F2 gradually increases along the direction from the first housing portion 111 to the second housing portion 112.

[0103] This allows at least a portion of the casing 110 to gradually increase in thickness, which is beneficial for improving the toughness and strength of the casing 110 and also for improving the reliability of the battery cell 100. In addition, the gap between the third casing portion 113 and the electrode assembly 120 gradually decreases, which also improves the ease of inserting the electrode assembly 120 into the casing.

[0104] In some embodiments, the thickness of at least one of the first portion 1121 and the second portion 1122 is greater than the thickness of the first housing portion 111, and the thickness of the sidewall of the third housing portion 113 gradually increases along the second direction F2 in the direction from the first housing portion 111 to the second housing portion 112.

[0105] In this way, the electrode assembly 120 can be restricted from moving along the second direction by utilizing the portion of the second housing portion 112 that is thicker than the first housing portion 111. It can also be understood that the thickness of the sidewall of the housing 110 along the third direction F3 remains unchanged along the first direction F1 (the first direction F1, the second direction F2 and the third direction F3 intersect each other). This also helps to improve the space utilization rate inside the housing 110, thereby increasing the energy density of the battery cell 100.

[0106] In some embodiments, the housing 110 has a receiving cavity Q for accommodating the electrode assembly 120, and the housing 110 is provided with a fluid channel T communicating with the receiving cavity Q, the fluid channel being at least located on the inner wall of the second housing portion 112. The battery cell 100 also includes a pressure relief mechanism 130, which is located on the side of the second housing portion 112 away from the first housing portion 111 when the pressure in the receiving cavity Q is greater than or equal to a preset value along the first direction F1. The fluid channel T can communicate with the external environment by means of the pressure relief mechanism 130.

[0107] Alternatively, the battery cell 100 may also include a first cover 140, which is connected to the side of the second housing portion 112 away from the first housing portion 111 along the first direction F1, and a pressure relief mechanism 130 is provided on the first cover 140.

[0108] The pressure relief mechanism 130 can be an explosion-proof valve, a check valve, a pressure relief valve, or other component that can connect the accommodating cavity Q to the external environment when the pressure in the accommodating cavity Q is greater than or equal to a preset value.

[0109] The fluid channel T refers to a channel that is at least located on the inner wall of the second housing portion 112 and is accessible via the pressure relief mechanism 130.

[0110] A channel connecting to the external environment.

[0111] In this way, while the second housing portion 112 can restrict the movement of the electrode assembly 120 along the second direction F2, the gas generated inside the battery cell 100 can also be discharged outward through the fluid channel T, thereby improving the reliability and safety of the battery cell 100.

[0112] In some embodiments, the fluid channel T is provided at least on the inner wall of the second housing portion 112, and the fluid channel T extends from one side of the second housing portion 112 near the first housing portion 111 to the other side.

[0113] In this way, the fluid channel T and the pressure relief mechanism 130 can be used to release the gas generated in the battery cell 100, reducing the possibility of gas generated in the battery cell 100 accumulating between the first housing portion 111 and the electrode assembly 120 or between the third housing portion 113 and the electrode assembly 120, thereby improving the safety of the battery cell 100.

[0114] In some embodiments, the fluid channel T is recessed on the inner wall of the second housing portion 112 and the inner wall of the third housing portion 113, and the fluid channel T is disposed through the third housing portion 113 away from the second housing portion 112 and towards the second housing portion 112 away from the third housing portion 113.

[0115] In this way, the gas generated inside the battery cell 100 can be quickly discharged through the fluid channel T to the side of the battery cell 100 where the pressure relief mechanism 130 is provided, reducing the possibility of gas generated inside the battery cell 100 accumulating between the first housing portion 111 and the electrode assembly 120, thereby improving the safety of the battery cell 100.

[0116] In some embodiments, fluid channels T are provided on opposite sides of the second housing portion 112 along the second direction.

[0117] In this way, the gas generated inside the battery cell 100 can be discharged more quickly through the fluid channels T on both sides to the side of the battery cell 100 where the pressure relief mechanism 130 is provided, thereby improving the safety of the battery cell 100.

[0118] In some embodiments, the inner wall of the second housing portion 112 is provided with a first groove C1, and the inner wall of the third housing portion 113 is provided with a second groove C2. The first groove C1 and the second groove C2 are in communication with each other to form a fluid channel T.

[0119] It is possible that the first groove C1 is provided through the second housing portion 112 from the side near the third housing portion 113 to the side of the second housing portion 112 away from the third housing portion 113.

[0120] It is possible that the second groove C2 is provided through the third housing portion 113 from the side away from the second housing portion 112 to the side of the third housing portion 113 close to the second housing portion 112.

[0121] Since the first groove C1 and the second groove C2 are connected to each other, and the first groove C1 and the second groove C2 are connected to form a fluid channel T, the gas generated in the battery cell 100 can be quickly discharged to the side of the battery cell 100 where the pressure relief mechanism 130 is provided through the fluid channel T, thereby reducing the possibility of gas generated in the battery cell 100 accumulating between the first housing portion 111 and the electrode assembly 120, and thus improving the safety of the battery cell 100.

[0122] In some embodiments, the second housing portion 112 is provided with at least one first groove C1 on each of the opposite sides along the second direction F2, and the third housing portion 113 is provided with at least one second groove C2 on each of the opposite sides along the second direction F2. The first groove C1 and the corresponding second groove C2 are connected in a one-to-one correspondence to form a fluid channel T.

[0123] It is possible that the second housing portion 112 is provided with a plurality of first grooves C1 arranged at intervals along the third direction F3 on the opposite sides along the second direction F2, and the third housing portion 113 is provided with a plurality of second grooves C2 arranged at intervals along the third direction F3 on the opposite sides along the second direction F2.

[0124] In this way, the gas generated inside the battery cell 100 can be discharged more quickly to the side of the battery cell 100 where the pressure relief mechanism 130 is provided through multiple fluid channels T, thereby improving the safety of the battery cell 100.

[0125] In some embodiments, the thickness of the first housing portion 111 is a first thickness, and the maximum thickness of the portion of the second housing portion 112 where the first groove C1 is provided is a second thickness, wherein the first thickness is less than the second thickness. The groove depth of the first groove C1 is less than or equal to the difference between the second thickness and the first thickness.

[0126] In this way, while the venting requirements of the battery cell 100 can be met by using the fluid channel T, the second housing portion 112 can also have a certain thickness, that is, the thickness of the second housing portion 112 is greater than or equal to the first thickness, which can improve the reliability of the second housing portion 112 and the battery cell 100.

[0127] In some embodiments, the thickness of the first housing portion 111 is a first thickness, and the maximum thickness of the portion of the third housing portion 113 where the second groove C2 is provided is a third thickness, wherein the first thickness is less than the third thickness, and the groove depth of the second groove C2 is less than or equal to the difference between the third thickness and the first thickness.

[0128] In this way, while the exhaust requirements of the battery cell 100 can be met by utilizing the fluid channel T, the third housing portion 113 can also have a certain thickness, that is, the thickness of the third housing portion 113 is greater than or equal to the first thickness, which can improve the reliability of the third housing portion 113 and the battery cell 100.

[0129] In some embodiments, the first housing portion 111 has a first dimension L1 along the first direction F1, the second housing portion 112 has a second dimension along the first direction F1, and the third housing portion 113 has a third dimension along the first direction F1. The first dimension is larger than the second dimension and the third dimension is larger than the third dimension.

[0130] The first dimension is L1, and the second dimension is L2.

[0131] Thus, since the first housing portion 111 is longer in the first direction F1, the ease of housing the electrode assembly 120 can be improved.

[0132] In some embodiments, the second dimension is larger than the third dimension.

[0133] In this way, the ease of inserting the electrode assembly 120 into the housing can be improved, and the second housing portion 112 can be used to better restrict the movement of the electrode assembly 120 along the second direction F2, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, which is conducive to improving the reliability of the battery cell 100.

[0134] In some embodiments, the dimension of the first housing portion 111 along the first direction F1 is a first dimension, the dimension of the second housing portion 112 along the first direction F1 is a second dimension, and the dimension of the housing 110 along the first direction is L. The first dimension is 0.6×L-0.9×L, and the second dimension is 0.15×L-0.3×L.

[0135] It is possible that the third dimension is 0.05×L-0.1×L.

[0136] For example, the first dimension is 0.6×L, 0.7×L, 0.8×L or 0.9×L.

[0137] For example, the second dimension is 0.15×L, 0.2×L, or 0.3×L.

[0138] For example, the third dimension is 0.05×L, 0.06×L, 0.07×L, 0.08×L, 0.09×L or 0.1×L.

[0139] The first dimension is L1, the second dimension is L2, for example, L1 is 0.6×L, L2 is 0.3×L, and the third dimension is L﹣L1﹣L2=0.1×L.

[0140] Setting the dimensions of the first housing portion 111 along the first direction F1 within a suitable range, and setting the dimensions of the second housing portion 112 along the first direction F1 within a suitable range, not only improves the ease of inserting the electrode assembly 120 into the housing, but also effectively utilizes the second housing portion 112 to restrict the movement of the electrode assembly 120 along the second direction F2, thereby better reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, and thus improving the reliability of the battery cell 100.

[0141] In some embodiments, the electrode assembly 120 includes an electrical isolator 121 and an electrode assembly 122. The electrical isolator 121 is disposed within the housing 110. Along a second direction, the electrical isolator 121 is spaced apart from the inner wall of the first housing portion 111 and abuts against the inner wall of the second housing portion 112. The electrode assembly 122 is at least partially disposed within the electrical isolator 121, and the electrode assembly 122 is electrically isolated from the housing 110 by the electrical isolator 121.

[0142] Electrically isolating component 121 refers to a component on the battery cell 100 used to electrically isolate the electrode assembly 122 and the housing 110.

[0143] Electrically insulating element 121 may be covered on the outside of electrode assembly 122.

[0144] The electrode assembly 122 may include a first electrode, a separator and a second electrode stacked along a third direction F3; the first direction F1 and the second direction F2 intersect each other with the third direction F3.

[0145] It can be that the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. For example, the first direction F1 is parallel to the length direction of the housing 110, the second direction F2 is parallel to the height direction of the housing 110, and the third direction F3 is parallel to the width direction of the housing 110.

[0146] In this way, the electrode assembly 122 can be electrically isolated from the housing 110 by the electrical isolation component 121, and the movement of the electrode assembly 120 along the second direction F2 can be restricted by the second housing portion 112. This can reduce the possibility of the electrode assembly 120 moving or tilting inside the housing 110, and also reduce the occurrence of electrode damage or tab tearing, thereby improving the reliability of the battery cell 100.

[0147] In other embodiments, the electrode assembly 120 includes a first electrode, a separator, and a second electrode stacked along a third direction F3; the first direction F1, the second direction F2, and the third direction F3 intersect each other.

[0148] It can be that the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. For example, the first direction F1 is parallel to the length direction of the housing 110, the second direction F2 is parallel to the height direction of the housing 110, and the third direction F3 is parallel to the width direction of the housing 110.

[0149] It is possible that one of the first electrode and the second electrode is a positive electrode, and the other of the first electrode and the second electrode is a negative electrode.

[0150] In this way, the electrode assembly 120 can be restricted from moving along the second direction F2 by using the portion of the second housing portion 112 that is thicker than the first housing portion 111. This reduces the possibility of the electrode assembly 120 moving or tilting inside the housing 110, and also reduces the possibility of damage to the electrode sheet or tearing of the tab, thereby improving the reliability of the battery cell 100.

[0151] In some embodiments, the housing 110 has a receiving cavity Q for accommodating the electrode assembly 120, and the housing 110 has an opening K communicating with the receiving cavity Q, the opening K being at least located on the side of the first housing portion 111 away from the second housing portion 112.

[0152] It is possible that the opening K is located on the side of the first housing portion 111 away from the second housing portion 112; or it is possible that one opening K is located on the side of the first housing portion 111 away from the second housing portion 112, and the other opening K is located on the side of the second housing portion 112 away from the first housing portion 111.

[0153] Since the opening K is provided at least on the side of the first housing portion 111 away from the second housing portion 112, the electrode assembly 120 can be easily inserted into the housing through the opening K in the direction from the first housing portion 111 to the second housing portion 112, thereby improving the ease of inserting the electrode assembly 120 into the housing.

[0154] In some embodiments, one opening K is provided on the side of the first housing portion 111 away from the second housing portion 112, and another opening K is provided on the side of the second housing portion 112 away from the first housing portion 111. The battery cell 100 also includes a second cover 150, which is connected to the side of the first housing portion 111 away from the second housing portion 112 to close the adjacent opening K. The first cover 140 is used to close the other opening K.

[0155] In this way, the electrode assembly 120 can be inserted into the housing through an opening K in the direction from the first housing portion 111 to the second housing portion 112. At the same time, the first cover 140 and the second cover 150 can be used to close the two openings K at opposite ends of the housing 110 in the first direction F1, which can effectively protect the electrode assembly 120 inside the housing 110 and prevent water or dust from the external environment from entering the receiving cavity Q.

[0156] In some embodiments, along the second direction F2, the first housing portion 111 is spaced apart from the electrode assembly 120, and the inner wall of the second housing portion 112 abuts against the electrode assembly 120.

[0157] On the one hand, since the first housing portion 111 and the electrode assembly 120 are spaced apart along the second direction F2, it is convenient for the electrode assembly 120 to be assembled into the housing, and thus the electrode assembly 120 can be inserted into the first housing portion 111 and the second housing portion 112 respectively. On the other hand, after the electrode assembly 120 is assembled into the housing, the second housing portion 112 can be used to restrict the movement of the electrode assembly 120, thereby reducing the possibility of the electrode assembly 120 moving or tilting inside the housing 110, which is beneficial to improving the reliability of the battery cell 100.

[0158] One embodiment of this application provides a battery device 10, including a battery cell 100 from any of the above embodiments.

[0159] One embodiment of this application provides an electrical device including the battery device 10 described above.

[0160] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0161] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: Casing (110); and An electrode assembly (120) is disposed within the housing (110); The housing (110) includes a first housing portion (111) and a second housing portion (112) connected along a first direction. Along the second direction, the inner wall of the first housing portion (111) is spaced apart from the electrode assembly (120); the distance between the two opposite sidewalls of the first housing portion (111) along the second direction is a first distance; The second housing portion (112) includes a first portion (1121) and a second portion (1122) disposed opposite to each other along the second direction, wherein the distance between the first portion (1121) and the second portion (1122) along the second direction is smaller than the first distance. The first direction and the second direction intersect each other.

2. The battery cell according to claim 1, characterized in that, Along the second direction, the inner wall of the second housing portion (112) abuts against the electrode assembly (120).

3. The battery cell according to claim 2, characterized in that, The electrode assembly (120) is interference-fitted between the first part (1121) and the second part (1122).

4. The battery cell according to any one of claims 1-3, characterized in that, The minimum thickness of at least one of the first portion (1121) and the second portion (1122) is greater than the maximum thickness of the first housing portion (111).

5. The battery cell according to claim 4, characterized in that, The thickness of the first housing portion (111) is 0.01mm-3mm; and / or The thickness of at least one of the first part (1121) and the second part (1122) is 0.01mm-5mm.

6. The battery cell according to any one of claims 1-3, characterized in that, The housing (110) further includes a third housing portion (113) connected between the first housing portion (111) and the second housing portion (112) along the first direction. The minimum thickness of the third housing portion (113) is greater than or equal to the thickness of the first housing portion (111), and the maximum thickness of the third housing portion (113) is less than or equal to the maximum thickness of the second housing portion (112).

7. The battery cell according to claim 6, characterized in that, Along the direction from the first housing portion (111) to the second housing portion (112), the thickness of at least a portion of the third housing portion (113) gradually increases.

8. The battery cell according to claim 6, characterized in that, The housing (110) has a receiving cavity (Q) for accommodating the electrode assembly (120). The housing (110) is provided with a fluid channel (T) that communicates with the receiving cavity (Q). The fluid channel (T) is provided at least on the inner wall of the second housing portion (112); The battery cell also includes: The pressure relief mechanism (130) is located on the side of the second housing part (112) away from the first housing part (111) along the first direction. When the pressure in the receiving cavity (Q) is greater than or equal to a preset value, the fluid passage (T) can be connected to the external environment by means of the pressure relief mechanism (130).

9. The battery cell according to claim 8, characterized in that, The fluid channel (T) is at least recessed in the inner wall of the second housing portion (112), and the fluid channel (T) extends from one side of the second housing portion (112) near the first housing portion (111) to the other side; or The fluid channel (T) is recessed on the inner wall of the second housing part (112) and the inner wall of the third housing part (113), and the fluid channel (T) extends through the third housing part (113) away from the second housing part (112) towards the second housing part (112) away from the third housing part (113).

10. The battery cell according to claim 8, characterized in that, Along the second direction, the fluid channels (T) are respectively provided on opposite sides of the second housing portion (112).

11. The battery cell according to claim 8, characterized in that, The second housing part (112) has a first groove (C1) on its inner wall, and the third housing part (113) has a second groove (C2) on its inner wall. The first groove (C1) and the second groove (C2) are in communication with each other to form the fluid channel (T).

12. The battery cell according to claim 11, characterized in that, The second housing portion (112) is provided with at least one first groove (C1) on each of the opposite sides along the second direction, and the third housing portion (113) is provided with at least one second groove (C2) on each of the opposite sides along the second direction. The first groove (C1) and the corresponding second groove (C2) are connected in a one-to-one correspondence to form a fluid channel (T).

13. The battery cell according to claim 11, characterized in that, The thickness of the first housing portion (111) is a first thickness, and the maximum thickness of the portion of the second housing portion (112) having the first groove (C1) is a second thickness, wherein the first thickness is less than the second thickness; the groove depth of the first groove (C1) is less than or equal to the difference between the second thickness and the first thickness; and / or The thickness of the first housing portion (111) is a first thickness, and the maximum thickness of the portion of the third housing portion (113) having the second groove (C2) is a third thickness, wherein the first thickness is less than the third thickness; and the groove depth of the second groove (C2) is less than or equal to the difference between the third thickness and the first thickness.

14. The battery cell according to claim 6, characterized in that, The first housing portion (111) has a first dimension along the first direction, the second housing portion (112) has a second dimension along the first direction, and the third housing portion (113) has a third dimension along the first direction; The first dimension is larger than the second dimension, and is also larger than the third dimension.

15. The battery cell according to claim 14, characterized in that, The second dimension is larger than the third dimension.

16. The battery cell according to any one of claims 1-3, characterized in that, The first housing portion (111) has a first dimension along the first direction, and the second housing portion (112) has a second dimension along the first direction; The dimension of the housing (110) along the first direction is L; Wherein, the first dimension is 0.6×L-0.9×L; The second dimension is 0.15×L-0.3×L.

17. The battery cell according to any one of claims 1-3, characterized in that, The electrode assembly (120) includes: An electrical isolator (121) is disposed within the housing (110); along the second direction, the electrical isolator (121) is spaced apart from the inner wall of the first housing portion (111) and abuts against the inner wall of the second housing portion (112); and The electrode assembly (122) is at least partially disposed within the electrical isolation element (121).

18. The battery cell according to any one of claims 1-3, characterized in that, The housing (110) has a receiving cavity (Q) for accommodating the electrode assembly (120). The housing (110) is provided with an opening (K) that communicates with the receiving cavity (Q); The opening (K) is provided at least on the side of the first housing portion (111) away from the second housing portion (112).

19. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-18.

20. An electrical appliance, characterized in that, Includes the battery device as described in claim 19.

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