Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an end cover and a fluid; one end of the shell is opened and provided with an inner cavity; the electrode assembly is at least partially arranged in the inner cavity; the end cover is assembled at the opening of the shell to seal the inner cavity, the end cover is provided with an electrode terminal, the side face, facing the electrode assembly, of the end cover is an inner side face, the inner side face is provided with a first area sunken towards the side away from the electrode assembly, the electrode terminal is arranged in the first area, and the direction, pointing to the electrode assembly, of the end cover is a first direction; the distance between the first region and the electrode assembly in the first direction is greater than the distance between other regions of the inner side surface except the first region and the electrode assembly; the fluid is arranged in the inner cavity, can be gathered in the first area and at least exchanges heat with the electrode terminals. The utility model aims to improve the heat dissipation effect of a pole region of a battery monomer.

Description

Technical Field

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

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source. A battery device can include multiple battery cells. When a battery cell is charged and discharged, it generates heat. In order to ensure its normal operation, a suitable heat exchange system must be set up.

[0003] In related technologies, heat exchange systems typically use contact cooling to cool the large surface, sides, or bottom of battery cells. However, in some applications, the hottest area of ​​a battery cell is in the current-carrying region, i.e., the terminal area, including the tabs, adapters, and terminals. The heat dissipation effect of related technologies for the terminal area is relatively poor. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which aims to improve the heat dissipation effect of the terminal area of ​​the battery cell.

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

[0006] A housing, wherein one end of the housing is open and has an internal cavity;

[0007] An electrode assembly, wherein the electrode assembly is at least partially disposed within the inner cavity;

[0008] An end cap, fitted into the opening of the housing to close the inner cavity, the end cap having electrode terminals, the side of the end cap facing the electrode assembly being an inner side surface, the inner side surface having a first region recessed towards the side opposite to the electrode assembly, the electrode terminals being disposed in the first region, the direction in which the end cap points towards the electrode assembly being a first direction, in which the distance between the first region and the electrode assembly is greater than the distance between the other regions of the inner side surface (excluding the first region) and the electrode assembly; and

[0009] The fluid, located in the inner cavity, is able to converge in the first region and exchange heat with at least the electrode terminals.

[0010] The effect of this embodiment is that when the battery cell is used upside down, the fluid inside the casing can preferably converge in the first region under the action of gravity, and absorb heat from the electrode terminals and other devices in the first region, which can improve the heat exchange effect at the electrode terminals to a certain extent.

[0011] In one embodiment of the first aspect, the electrode assembly has tabs, and the electrode terminals have connection surfaces that connect to the tabs, wherein in the first direction, the distance between the connection surface and the electrode assembly is at least greater than the distance from a portion of the inner surface to the electrode assembly.

[0012] The effect of this embodiment is that when the battery cell is inverted, the side of the electrode terminal facing the electrode assembly is the connection surface connected to the tab. The distance between this connection surface and the electrode assembly is at least greater than the distance between a portion of the inner side surface and the electrode assembly. This allows for the existence of an inner side surface region higher than this connection surface in the direction of gravity, which can achieve fluid convergence to a certain extent and maintain the immersion of the electrode terminal.

[0013] In one embodiment of the first aspect, the electrode assembly has tabs, and the electrode terminals have connection surfaces that connect to the tabs. In the first direction, the distance between the connection surface and the electrode assembly is greater than the distance between the electrode assembly and other regions of the inner surface other than the first region.

[0014] The effect of this embodiment is that when the battery cell is inverted, this embodiment provides that the height of the connection surface is less than that of the inner side surface area outside the first area, which allows the fluid to converge towards the first area and can immerse the connection surface. That is, when there is fluid in the inner side surface area other than the first area, the electrode assembly is always in an immersed state, which can effectively achieve heat dissipation.

[0015] In one embodiment of the first aspect, the electrode terminal includes a positive terminal and a negative terminal, the direction in which the positive terminal points to the negative terminal is a second direction, and in the second direction, two first regions are spaced apart on the inner side surface, the positive terminal is disposed in one of the first regions, and the negative terminal is disposed in the other first region.

[0016] The effect of this embodiment is that it ensures that both the positive and negative terminals can be heated by the fluid.

[0017] In one embodiment of the first aspect, the inner surface further includes a second region located between the two first regions.

[0018] The advantage of this embodiment is that when the battery cell is inverted, the fluid flows to the bottom, at least filling the first area with fluid. When the fluid level is low, a small amount of fluid will still converge in the first area. The second area is higher than the first area, so even if the fluid cannot cover the second area when it is low, it can still cover the first area, allowing the electrode terminals in the first area to dissipate heat. The second area occupies a certain area, thus making the area occupied by the first area smaller. When the fluid enters the first area, it can reach a certain liquid level, covering as many electrode terminals as possible.

[0019] In one embodiment of the first aspect, the first region has a first plane parallel to the second direction, the second region has a second plane parallel to the second direction, the distance between the first plane and the electrode assembly along the first direction is greater than the distance between the second plane and the electrode assembly, the first direction is perpendicular to the second direction, and the first plane and the second plane are connected along the second direction to form a stepped structure.

[0020] The advantage of this embodiment is that by setting both the first region and the second region as mutually parallel planes perpendicular to the first direction, the structural design is simpler, the processing steps are easier to operate, and the same effect of causing the fluid to converge towards the first region is achieved.

[0021] In one embodiment of the first aspect, the first region has a first plane parallel to the second direction, the first plane being perpendicular to the first direction, and the second region has a third plane inclined relative to the first plane, wherein in the first direction, the distance between the side of the third plane closer to the first plane and the electrode assembly is greater than the distance between the side of the third plane farther from the first plane and the electrode assembly. 。

[0022] The effect of this embodiment is that by setting the third plane of the second region to be inclined, the fluid can flow along the slope to one side of the first region under the action of gravity, ensuring that the fluid wets the electrode terminals and enhancing the heat dissipation effect of the electrode terminal area.

[0023] In one embodiment of the first aspect, the second region has two third planes, which are connected to adjacent first planes along the second direction.

[0024] The effect of this embodiment is that the two third planes of the second region are both inclined, and the two ends of the two third planes are the first regions respectively. In this way, the inner side of the entire end cap forms a structure that is high in the middle and low on both sides, and the fluid will converge to both sides to ensure that the fluid effectively wets the electrode terminals.

[0025] In one embodiment of the first aspect, the angle between the third plane and the first plane is greater than or equal to 0.1 degrees and less than or equal to 5 degrees.

[0026] The effect of using this value range is that, firstly, within this range, the fluid can flow and converge to both sides, and secondly, this angle will not be too large to make the third plane too close to the electrode terminal, leaving a certain amount of reserved space to prevent contact and collision with the electrode assembly, while also not making the manufacturing process too complicated.

[0027] In one embodiment of the first aspect, the angle between the third plane and the first plane is greater than or equal to 0.5 degrees and less than or equal to 3 degrees. This embodiment provides a more favorable range of angle values.

[0028] In one embodiment of the first aspect, the inner side facing the sidewall of the electrode assembly is provided with a groove, the inner surface of the groove forms the first region, the electrode terminal is installed in the groove, and at least a portion of the electrode terminal is spaced apart from the inner surface of the groove.

[0029] The advantage of this embodiment is that a groove is provided on the inner side, the opening process of the groove is simpler, and the relative area is smaller, which is sufficient to accommodate the electrode terminals. Furthermore, it is easier to wet the electrode terminals when the fluid converges.

[0030] In one embodiment of the first aspect, the peripheral wall of the electrode terminal is spaced apart from the inner surface of the groove.

[0031] The advantage of this embodiment is that it allows fluid to easily enter the tank, ensuring heat dissipation for the electrode terminals.

[0032] In one embodiment of the first aspect, the groove has a corresponding protrusion formed on the side of the end cap opposite to the electrode assembly.

[0033] The advantage of this embodiment is that the tank is a submerged tank, and the tank has a protrusion on the side of the end cap away from the electrode assembly. The advantage of this is that, firstly, it is not necessary to make the end cap very thick to set the tank, and secondly, this setting allows the electrode terminals to be completely submerged in the tank, so that the electrode terminals are located at the bottom.

[0034] In one embodiment of the first aspect, a lower plastic is further provided between the end cap and the electrode assembly, the lower plastic being attached to at least a portion of the inner surface.

[0035] The advantage of this embodiment is that the lower plastic layer serves to position the end cap between the end cap and the electrode assembly when the end cap is assembled onto the housing, thus preventing forced compression. When the end cap has a first region and a second region, the lower plastic layer is laid and extended along the first or second region according to its shape, ensuring accurate positioning when the end cap is assembled onto the housing and avoiding forced compression.

[0036] Secondly, this application also provides a battery device, including a housing and the battery cell described in any embodiment, wherein the housing has a top surface and a bottom surface disposed opposite to each other along the first direction, and the end cap is disposed facing the bottom surface. This facilitates the convergence of fluid to the electrode terminals, enabling better heat dissipation for the electrode terminals and other devices.

[0037] Thirdly, this application also provides an electrical device, including the battery cell provided in any of the embodiments or the battery device provided in the above embodiments.

[0038] 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

[0039] 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:

[0040] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0041] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0042] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0043] Figure 4 for Figure 3 A top view of the structure of a single battery cell;

[0044] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along the AA direction;

[0045] Figure 6 for Figure 5Enlarged structural diagram at point D;

[0046] Figure 7 for Figure 3 A schematic diagram of the end cap structure;

[0047] Figure 8 A cross-sectional view of a single battery cell provided in some embodiments of this application;

[0048] Figure 9 for Figure 8 A schematic diagram of the end cap structure of the provided battery cell;

[0049] Figure 10 A schematic diagram of the end cap structure of a battery cell provided in some embodiments of this application;

[0050] Figure 11 for Figure 10 Top view of the middle end cap;

[0051] Figure 12 for Figure 11 A sectional view of the middle end cap along the BB direction;

[0052] Figure 13 for Figure 12 Enlarged structural diagram at point E;

[0053] Figure 14 A schematic diagram of the end cap structure of a battery cell provided in some embodiments of this application;

[0054] Figure 15 for Figure 14 Top view of the middle end cap;

[0055] Figure 16 for Figure 15 A cross-sectional view along the CC direction;

[0056] Figure 17 for Figure 16 A magnified structural diagram at point F in the middle.

[0057] The reference numerals in the detailed embodiments are as follows:

[0058] 1000, vehicles;

[0059] 100. Battery assembly; 200. Controller; 300. Motor;

[0060] 10. Battery cell; 101. Housing; 102. Electrode assembly; 103. End cap; 104. Electrode terminal; 105. Connecting surface; 106. Inner surface; 107. First region; 108. Second region; 1071. First plane; 1081. Second plane; 1082. Third plane; 109. Tank; 110. Gap; 111. Protrusion; 112. Lower plastic. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] 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.

[0068] 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.

[0069] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery application areas, the market demand is also constantly increasing.

[0070] The battery unit is a complete structural unit, including a housing. Multiple individual battery cells are housed inside the housing; in some special scenarios, only one individual battery cell may be housed inside the housing. When there are multiple individual battery cells, they can be arranged in a row to form a battery cell assembly.

[0071] The battery apparatus provided in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar. A mixed connection refers to a combination of series and parallel connections.

[0072] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0073] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0074] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0075] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0076] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0077] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0078] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0079] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0080] like Figure 2 This application embodiment also provides an electrical device 1000 having a battery device 100, that is, an electrical device 1000 that uses the battery device 100 as a power source.

[0081] The technical solutions described in this application are applicable to various electrical devices using battery device 100, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0082] The battery device 100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can use power systems equipped with the battery device 100 disclosed in this application, which helps improve the reliability of the electrical devices.

[0083] For ease of explanation, the following embodiments use a vehicle as an example to illustrate the electrical device 1000 provided in this application.

[0084] 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 device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Battery devices generate heat during operation, so it is necessary to dissipate the heat in a timely manner to effectively ensure the normal temperature environment of the battery device.

[0087] In related technologies, the heat exchange system used in battery devices is mostly a plate heat exchanger, which uses a cooling plate with a temperature lower than that of the battery cell. The plate is attached to the surface of the battery cell to exchange heat.

[0088] With the rapid development of the battery industry, the application requirements for battery operating conditions are becoming more stringent. For example, there are fast-charging products (6C, 8C, etc.), high-temperature resistant battery cells for high-temperature environments, and large battery cells for energy storage, commercial vehicles, and heavy trucks. The problem brought about by these application scenarios is that when the temperature rise of the battery cell is too high, the chemical system and mechanical components of the battery cell may not be able to perform their functions properly. In the battery cell, the area with the highest temperature is usually in the terminal area, that is, the area where the tabs, adapters, and terminals are located. Current common cooling measures are mainly concentrated in the module, such as water-cooled plate design and heat sink, but these mainly target the bottom or large surface of the battery cell. The temperature in these areas is relatively mild compared to the terminal area, and the heat dissipation capacity for the terminal area is limited, resulting in poor heat dissipation effect in the terminal area of ​​the battery cell.

[0089] Based on this, this application provides a battery cell 10, which aims to improve the heat exchange effect of the electrode region of the battery cell 10.

[0090] Please see Figures 3-7 The battery cell 10 in this embodiment includes a housing 101, an electrode assembly 102, an end cap 103, and a fluid.

[0091] The housing 101 has an opening at one end and an inner cavity; the electrode assembly 102 is at least partially disposed within the inner cavity; an end cap 103 is fitted into the opening of the housing 101 to close the inner cavity, and the end cap 103 has electrode terminals 104. The side of the end cap 103 facing the electrode assembly 102 is an inner side 106, and the inner side 106 has a first region 107 recessed towards the side opposite to the electrode assembly 102. The electrode terminals 104 are disposed in the first region 107, and the direction in which the end cap 103 points towards the electrode assembly 102 is a first direction. In the first direction, the distance between the first region 107 and the electrode assembly 102 is greater than the distance between other regions of the inner side 106 (excluding the first region 107) and the electrode assembly 102. Fluid is disposed within the inner cavity and can converge in the first region 107 and exchange heat with at least the electrode terminals 104. The first direction is... Figure 5 The X direction in the equation.

[0092] Specifically, the housing 101 has an internal accommodating space, specifically an inner cavity, for housing the electrode assembly 102. The electrode assembly 102 includes a positive electrode plate, a negative electrode plate, and a separator, which are stacked or wound in the inner cavity. The end cap 103 is a cover structure located at one end opening of the housing 101, and the end cap 103 is used to close the housing 101.

[0093] The end cap 103 is provided with electrode terminals 104, which are used to connect to the tabs of the electrode plates of the electrode assembly 102. When the tabs are equipped with adapter plates, adapter plates can also be connected to achieve circuit conduction. Since the electrode terminals 104 and the tabs are used for overcurrent, the temperature will be relatively high. The electrode terminals 104 are also known as poles, and the area where they are located is called the pole area, or electrode terminal area.

[0094] The casing 101 contains a fluid. The fluid has a higher heat dissipation coefficient than air, so it has a better heat dissipation effect than the gas inside the casing. The fluid can be an electrolyte, which can also absorb heat to some extent.

[0095] When the end cap 103 covers the housing 101, the side of the end cap 103 facing the electrode assembly 102 is the inner side 106 of the end cap 103, and the inner side 106 has a first region 107. In this embodiment, the battery cell 10 is inverted during use, that is, the end cap 103 is located at the bottom of the battery cell 10 in the direction of gravity. At this time, the first direction is the direction of gravity. Under the action of gravity, the fluid in the housing 101 can be located on one side of the end cap 103. Since the first region 107 is concave downward relative to the electrode assembly 102 in the direction of gravity, the fluid can reach the first region 107. Moreover, when the amount of fluid is small, the fluid will preferentially concentrate in the first region 107 under the action of gravity. This can wet the electrode terminals 104 and other components in the first region 107, increasing the heat exchange effect at this location. In the first direction (the direction of gravity when inverted), the distance between the first region 107 and the electrode assembly 102 is greater than the distance between other regions of the inner side surface 106 (excluding the first region 107) and the electrode assembly 102. Therefore, the first region 107 is located at the bottom of the interior of the housing 101, facilitating fluid convergence. The first direction is... Figure 5 The X direction in the equation.

[0096] The effect of this embodiment is that when the battery cell 10 is used upside down, the fluid inside the casing 101 can preferably converge at the first region 107 under the action of gravity, and absorb heat from the electrode terminals 104 and other devices at the first region 107, which can improve the heat exchange effect at the electrode terminals 104 to a certain extent.

[0097] In some embodiments, please refer to Figures 5-7 The electrode assembly 102 has tabs, and the electrode terminal 104 has a connection surface 105 connected to the tabs. In a first direction, the distance between the connection surface 105 and the electrode assembly 102 is at least greater than the distance between a portion of the inner surface 106 and the electrode assembly 102.

[0098] Specifically, when the battery cell 10 is inverted, the side of the electrode terminal 104 facing the electrode assembly 102 is the connection surface 105 connected to the tab. The distance between this connection surface 105 and the electrode assembly 102 is at least greater than the distance between a portion of the inner side surface 106 and the electrode assembly 102. This allows for the existence of an area of ​​the inner side surface 106 above this connection surface 105 in the direction of gravity, which can, to a certain extent, allow fluid to converge and maintain the immersion of the electrode terminal 104.

[0099] In some cases, the distance between the connecting surface 105 and the electrode assembly 102 in the first direction is greater than the distance between the entire area of ​​the inner surface 106 and the electrode assembly 102.

[0100] Specifically, when the battery cell 10 is inverted, the height of the connecting surface 105 is lower than the height of all positions of the inner side surface 106, including the height of the first region 107. That is, the electrode terminal 104 is recessed in the first region 107. Thus, the position of the electrode terminal 104 is the lowest point of the entire battery cell 10. As long as there is fluid in the battery cell 10, it will converge at the position of the electrode terminal 104 and submerge the electrode terminal 104, ensuring the heat dissipation effect of the electrode terminal 104.

[0101] In some embodiments, please refer to Figures 5-7 The electrode assembly 102 has a tab, and the electrode terminal 104 has a connection surface 105 connected to the tab. In a first direction, the distance between the connection surface 105 and the electrode assembly 102 is greater than the distance between the electrode assembly 102 and other areas of the inner side surface 106 other than the first region 107.

[0102] Specifically, when the battery cell 10 is inverted, this embodiment provides that the height of the connection surface 105 is less than the height of the inner side surface 106 region outside the first region 107, which allows fluid to converge towards the first region 107 and can immerse the connection surface 105. That is, when there is fluid in the inner side surface 106 region other than the first region 107, the electrode assembly 102 is always in an immersed state, which can effectively achieve heat dissipation.

[0103] In some embodiments, please refer to the figure. Figures 5-7 The electrode terminal 104 includes a positive terminal and a negative terminal. The direction from the positive terminal to the negative terminal is a second direction. In this second direction, two first regions 107 are spaced apart on the inner surface 106. The positive terminal is located in one of the first regions 107, and the negative terminal is located in the other first region 107. The second direction is... Figure 5 in the Y direction.

[0104] Specifically, the electrode terminals 104 on the end cap 103 include a positive terminal and a negative terminal, which are respectively located on both sides of the end cap 103. Therefore, in this embodiment, the positive terminal and the negative terminal are respectively located in the first region 107, that is, there are two first regions 107.

[0105] The effect of this embodiment is that it ensures that both the positive and negative terminals can be heated by the fluid.

[0106] In some embodiments, please refer to the figure. Figures 5-7 The inner surface 106 also includes a second region 108, which is located between the two first regions 107.

[0107] The electrode terminal 104 includes a positive terminal and a negative terminal. The inner surface 106 also includes a second region 108. The direction from the positive terminal to the negative terminal is a second direction. In the second direction, the second region 108 is located between the first region 107 where the positive terminal is located and the first region 107 where the negative terminal is located. The second region 108 is located in the middle of the two first regions 107. Compared with the second region 108, the first region 107 is recessed to the side away from the electrode assembly 102. That is, when the battery cell 10 is inverted, the height of the first region 107 is lower than that of the second region 108.

[0108] The advantage of this embodiment is that when the battery cell 10 is inverted, the fluid flows to the bottom, at least filling the first region 107 with fluid. When the fluid level is low, a small amount of fluid will still converge in the first region 107. The second region 108 is higher than the first region 107. Even if the fluid level is low and cannot cover the second region 108, it can still cover the first region 107, allowing the electrode terminals 104 of the first region 107 to dissipate heat. The second region 108 occupies a certain area, thus making the area occupied by the first region 107 smaller. When the fluid enters the first region 107, it can have a certain liquid level, covering the electrode terminals 104 as much as possible.

[0109] In some embodiments, please refer to the figure. Figures 5-7 The first region 107 has a first plane 1071 parallel to the second direction, and the second region 108 has a second plane 1081 parallel to the second direction. Along the first direction, the distance between the first plane 1071 and the electrode assembly 102 is greater than the distance between the second plane 1081 and the electrode assembly 102. The first direction is perpendicular to the second direction. The first plane 1071 and the second plane 1081 are connected along the second direction to form a stepped structure. 。

[0110] The second direction is from the positive end to the negative end. In this direction, both the first region 107 and the second region 108 are planes, namely the first plane 1071 and the second plane 1081, which are parallel to each other. They can both have the same width, and the length of the second plane 1081 can be greater than the length of the first plane 1071, thus making the first plane 1071 relatively smaller, which is beneficial for fluid convergence. The stepped structure is formed at the intersection of the first plane 1071 and the second plane 1081, creating a step-like shape with the second plane 1081 on top and the first plane 1071 on the bottom, forming a difference in elevation.

[0111] The advantage of this embodiment is that by setting both the first region 107 and the second region 108 as mutually parallel planes perpendicular to the first direction, the structural design is simpler, the processing procedure is easier to operate, and it can also achieve the effect of causing the fluid to converge towards the first region 107.

[0112] In some embodiments, please refer to Figure 8 and Figure 9 The first region 107 has a first plane 1071 parallel to the second direction and perpendicular to the first direction. The second region 108 has a third plane 1082 inclined relative to the first plane 1071. In the first direction, the distance between the side of the third plane 1082 closer to the first plane 1071 and the electrode assembly 102 is greater than the distance between the side of the third plane 1082 away from the first plane 1071 and the electrode assembly 102.

[0113] Specifically, when the battery cell 10 is inverted, the first plane 1071 is set horizontally, with the first direction being the direction of gravity. The third plane 1082 forms an angle with the first plane 1071, so that the third plane 1082 has a certain degree of inclination relative to the first plane 1071. The side closer to the first plane 1071 is lower, and the side farther away from the first plane 1071 is higher. This facilitates the flow of fluid towards the first plane 1071, so that fluid is present at the electrode terminal 104.

[0114] The effect of this embodiment is that by setting the third plane 1082 of the second region 108 to be inclined, the fluid can flow along the slope to the side of the first region 107 under the action of gravity, ensuring that the fluid wets the electrode terminal 104 and enhancing the heat dissipation effect of the electrode terminal 104 region.

[0115] In some embodiments, please refer to Figure 8 and Figure 9 The second region 108 has two third planes 1082, which are connected to the adjacent first plane 1071 along the second direction.

[0116] Specifically, the two third planes 1082 of the second region 108 are both inclined, and the two ends of the two third planes 1082 are respectively the first region 107. In this way, the inner side 106 of the entire end cover 103 forms a structure that is high in the middle and low on both sides, and the fluid will converge to both sides to ensure that the fluid effectively wets the electrode terminal 104.

[0117] In some embodiments, please refer to Figure 9 The angle α between the third plane 1082 and the first plane 1071 is greater than or equal to 0.1 degrees and less than or equal to 5 degrees.

[0118] This embodiment provides a range for the included angle α, which is greater than or equal to 0.1 degrees and less than or equal to 5 degrees. The included angle is shown as angle α in the figure.

[0119] The effect of using this value range is that, firstly, within this range, the fluid can flow and converge to both sides, and secondly, this angle will not be too large to make the third plane 1082 too close to the electrode terminal 104, leaving a certain amount of reserved space to prevent contact and collision with the electrode assembly 102, and at the same time, it will not make the manufacturing process too complicated.

[0120] In some embodiments, please refer to Figure 9 The included angle α between the third plane 1082 and the first plane 1071 is greater than or equal to 0.5 degrees and less than or equal to 3 degrees. This embodiment provides a more optimized range of included angle values.

[0121] In some embodiments, please refer to Figures 10-13 ,or Figures 14-17 A groove 109 is provided on the side wall of the inner side 106 facing the electrode assembly 102. The inner surface of the groove 109 forms a first region 107. The electrode terminal 104 is installed in the groove 109, and at least a portion of the electrode terminal 104 is spaced apart from the inner surface of the groove 109. That is, a gap 110 is formed between at least a portion of the electrode terminal 104 and the inner surface of the groove 109.

[0122] Specifically, a groove 109 is formed on the inner side 106. The groove 109 has an inner wall, i.e., an inner surface, which is part of the inner side 106 and forms the first region 107. Since the groove 109 is formed on the inner side 106, the first region 107 itself is recessed away from the electrode assembly 102. Therefore, when the battery cell 10 is used upside down, the electrode terminal 104 installed in the groove 109 is also at the bottom position. In order to allow fluid to enter the first region 107, that is, to enter the groove 109 and wet the electrode terminal 104, this embodiment also provides a gap 110 that is spaced apart from at least a portion of the electrode terminal 104 from the inner surface of the groove 109. The gap 110 is for the passage of fluid.

[0123] The advantage of this embodiment is that a groove 109 is provided on the inner side 106. The process of opening the groove 109 is simpler, and the relative area is smaller, which is sufficient to accommodate the electrode terminal 104. Furthermore, it is easier to wet the electrode terminal 104 when the fluid converges.

[0124] In some embodiments, please refer to Figure 13 or Figure 17 The peripheral wall of the electrode terminal 104 is spaced apart from the inner surface of the groove 109.

[0125] In the circumferential direction of the electrode terminal 104, a gap 110 is provided between the electrode terminal 104 and the inner surface of the groove 109.

[0126] Specifically, this embodiment provides gaps 110 around the electrode terminal 104, so that fluid can flow into the tank 109 from various positions to wet the electrode terminal 104.

[0127] The effect of this embodiment is that it allows fluid to easily enter the tank 109, ensuring the heat dissipation effect of the electrode terminal 104.

[0128] In some embodiments, please refer to Figure 17 The groove 109 has a protrusion 111 formed on the side of the end cap 103 opposite to the electrode assembly 102.

[0129] Specifically, the tank 109 is a sink. The tank 109 has a protrusion 111 on the side of the end cap 103 away from the electrode assembly 102. The effect of this is that, firstly, the end cap 103 does not need to be made very thick to make the tank 109. Secondly, this setting allows the electrode terminal 104 to be completely sunk into the tank 109, so that the electrode terminal 104 is located at the bottom.

[0130] In some embodiments, please refer to Figure 5 and Figure 6 A lower plastic 112 is provided between the end cap 103 and the electrode assembly 102, and the lower plastic 112 is attached to at least part of the inner side surface 106.

[0131] The function of the lower plastic 112 is that, when the end cap 103 is assembled onto the housing 101, the lower plastic 112 is located between the end cap 103 and the electrode assembly 102, serving to position the end cap 103 and prevent hard compression. When the end cap 103 is provided with a first region 107 and a second region 108, the lower plastic 112 is laid and extended along the shape of the first region 107 or the second region 108, which ensures accurate positioning of the end cap 103 when it is assembled onto the housing 101 and avoids hard compression.

[0132] This application also provides a battery device 100, including a housing and a battery cell 10 as described in any embodiment. The housing has a top surface and a bottom surface disposed opposite each other along a first direction, and an end cap 103 is disposed facing the bottom surface. The battery cell 10 is disposed inside the housing, and the end cap 103 is located on one side of the bottom surface of the housing, that is, the end cap 103 is located at the bottom in the direction of gravity. This facilitates the flow of fluid to the electrode terminals 104, enabling better heat dissipation for the electrode terminals 104 and other devices. The housing of the battery device 100 is also the casing of the battery device 100.

[0133] This application also provides an electrical device, including the battery cell 10 provided in any embodiment or the battery device 100 described above.

[0134] 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: A housing, wherein one end of the housing is open and has an internal cavity; An electrode assembly, wherein the electrode assembly is at least partially disposed within the inner cavity; An end cap, fitted into the opening of the housing to close the inner cavity, the end cap having electrode terminals, the side of the end cap facing the electrode assembly being an inner side surface, the inner side surface having a first region recessed towards the side opposite to the electrode assembly, the electrode terminals being disposed in the first region, the direction in which the end cap points towards the electrode assembly being a first direction, in which the distance between the first region and the electrode assembly is greater than the distance between the other regions of the inner side surface (excluding the first region) and the electrode assembly; and The fluid, located in the inner cavity, is able to converge in the first region and exchange heat with at least the electrode terminals.

2. The battery cell as described in claim 1, characterized in that, The electrode assembly has tabs, and the electrode terminals have connecting surfaces that connect to the tabs. In the first direction, the distance between the connecting surface and the electrode assembly is at least greater than the distance from a portion of the inner surface to the electrode assembly.

3. The battery cell as described in claim 1 or 2, characterized in that, The electrode assembly has tabs, and the electrode terminals have connecting surfaces that connect to the tabs. In the first direction, the distance between the connecting surface and the electrode assembly is greater than the distance between the electrode assembly and other areas of the inner surface, excluding the first area.

4. The battery cell according to any one of claims 1-3, characterized in that, The electrode terminal includes a positive terminal and a negative terminal. The direction from the positive terminal to the negative terminal is a second direction. In the second direction, two first regions are spaced apart on the inner side. The positive terminal is located in one of the first regions, and the negative terminal is located in the other first region.

5. The battery cell as described in claim 4, characterized in that, The inner surface also includes a second region located between the two first regions.

6. The battery cell as described in claim 5, characterized in that, The first region has a first plane parallel to the second direction, the second region has a second plane parallel to the second direction, along the first direction, the distance between the first plane and the electrode assembly is greater than the distance between the second plane and the electrode assembly, the first direction is perpendicular to the second direction, and the first plane and the second plane are connected along the second direction to form a stepped structure.

7. The battery cell as described in claim 5, characterized in that, The first region has a first plane parallel to the second direction, and the first plane is perpendicular to the first direction. The second region has a third plane inclined relative to the first plane. In the first direction, the distance between the side of the third plane closer to the first plane and the electrode assembly is greater than the distance between the side of the third plane farther from the first plane and the electrode assembly. 。 8. The battery cell as described in claim 7, characterized in that, The second region has two third planes, which are connected to the adjacent first plane along the second direction.

9. The battery cell as described in claim 7 or 8, characterized in that, The angle between the third plane and the first plane is greater than or equal to 0.1 degrees and less than or equal to 5 degrees.

10. The battery cell according to any one of claims 7-9, characterized in that, The angle between the third plane and the first plane is greater than or equal to 0.5 degrees and less than or equal to 3 degrees.

11. The battery cell according to any one of claims 1 to 10, characterized in that, The inner side of the electrode assembly has a groove on its sidewall facing the electrode assembly. The inner surface of the groove forms the first region. The electrode terminal is installed in the groove, and at least a portion of the electrode terminal is spaced apart from the inner surface of the groove.

12. The battery cell as described in claim 11, characterized in that, The peripheral wall of the electrode terminal is spaced apart from the inner surface of the groove.

13. The battery cell as described in claim 11 or 12, characterized in that, The groove has a protrusion formed on the side of the end cap opposite to the electrode assembly.

14. The battery cell according to any one of claims 1-13, characterized in that, A lower plastic sheet is provided between the end cap and the electrode assembly, and the lower plastic sheet is attached to at least a portion of the inner side surface.

15. A battery device, characterized in that, The device includes a housing and a battery cell according to any one of claims 1-14, the housing having a top surface and a bottom surface disposed opposite each other along the first direction, and the end cap being disposed toward the bottom surface.

16. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-14 or the battery device as described in claim 15.

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