Battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a battery device and an electric equipment. In the battery monomer, a part of an end part on an insulating piece on one side of an electrode terminal is formed with a avoiding space between the end part and an end cover. When the part on the one side of the electrode terminal of the end cover is impacted, the part of the end cover can be deformed into the avoiding space, the impact force is effectively reduced, the probability that the impact force is directly transmitted to the insulating piece from the end cover is reduced, the probability that the internal structure of the battery monomer is pressed at the shoulder part in the impact condition is reduced, the possibility of the internal short risk is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices, and related equipment. Background Technology

[0002] As the market share of new energy vehicles increases, the market demand for reliable battery performance is also rising. However, due to limitations in the structural design of individual battery cells, the internal structure of the battery cell is easily damaged at the shoulder of the end cap during impact conditions, which can lead to the risk of internal short circuits and reduce the reliability of the battery cell. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment to reduce the probability of damaging the internal structure of the battery cell at the shoulder during impact conditions and to improve the reliability of the battery cell.

[0004] In a first aspect, this application provides a battery cell, the battery cell comprising: an end cap; two electrode terminals spaced apart on the end cap along a first direction; an insulating member disposed on the surface of the end cap along its own thickness direction; wherein the insulating member comprises a main body and end parts disposed at both ends of the main body, the two end parts being located on opposite sides of the two electrode terminals along the first direction, and at least one end part having a clearance space between itself and the end cap.

[0005] The aforementioned battery cell forms a clearance space between the end part of the insulating component located on the electrode terminal side and the end cap. When the part of the end cap located on the electrode terminal side is impacted, the end cap can deform into the clearance space, effectively reducing the impact force. At the same time, it also reduces the probability of the impact force being directly transmitted from the end cap to the insulating component, thereby reducing the probability of damaging the internal structure of the battery cell at the shoulder during impact conditions, and thus reducing the possibility of internal short circuits, which is beneficial to improving the reliability of the battery cell.

[0006] In some embodiments, each end component includes a base and a perimeter surrounding the base. The base is connected to the main body, and the perimeter contacts the surface of the end cap. A clearance space is formed between the base and the end cap of at least one end component. This design creates a clearance space between the bottom and the end cap, increasing the size of the clearance space and allowing the end cap to deform towards the clearance space, thereby increasing the buffering and weakening capacity against impacts and reducing the probability of damage to the internal structure under impact conditions.

[0007] In some embodiments, each base includes a bottom, with a perimeter surrounding the outer edge of the bottom. In end components with clearance spaces, the clearance space is formed between the surface of the bottom and the end cap. This design creates a clearance space between the bottom and the end cap, increasing the size of the clearance space and allowing the end cap to deform towards the clearance space, thereby increasing the buffering and weakening capacity against impacts and reducing the probability of damage to the internal structure under impact conditions.

[0008] In some embodiments, each base includes a bottom and a reinforcing protrusion. A perimeter is disposed around the outer periphery of the bottom, and the reinforcing protrusion is disposed on the surface of the bottom facing the end cap and located within the perimeter. In an end component with a clearance space, the clearance space is formed between the reinforcing protrusion of the base and the end cap. This design, by introducing a reinforcing protrusion on the bottom, not only improves the overall structural strength of the end component but also facilitates the deformation of part of the end cap structure into the clearance space under impact conditions, weakening the impact force and improving the reliability of the battery cell.

[0009] In some embodiments, in a base with clearance space, the height of the reinforcing protrusion above the bottom is lower than the height of the surrounding edge above the bottom. This design, with the reinforcing protrusion lower than the surrounding edge, makes it easier to form clearance space between the reinforcing protrusion and the end cap, which helps to reduce impact force and improve the reliability of the battery cell.

[0010] In some embodiments, the distance between the end of the reinforcing protrusion away from the bottom and the bottom surface facing away from the end cap is denoted as H1, the thickness of the bottom at the location of the reinforcing protrusion is denoted as H2, and the distance between the bottom surface facing away from the reinforcing protrusion and the surface of the perimeter facing the end cap is denoted as H3, wherein H2 < H1 ≤ 0.5 × H3. This design, controlling the distance H1 between H2 and 0.5 × H3, not only strengthens the overall structural strength of the end component but also provides sufficient clearance between the reinforcing protrusion and the end cap, reducing impact force and improving the reliability of the battery cell.

[0011] In some embodiments, in the base with clearance space, at least one of the two surfaces of the perimeter and the end cap facing each other is provided with clearance groove. This design introduces clearance groove between the perimeter and the end cap, allowing the end cap to deform not only towards the clearance space but also within the clearance groove, further reducing impact force and improving the reliability of the battery cell.

[0012] In some embodiments, the clearance groove includes a first clearance groove, which is disposed on the surface of the perimeter facing the end cap and extends through the perimeter along its thickness direction. This design allows the first clearance groove on the perimeter to facilitate deformation of a portion of the end cap structure into the first clearance groove under impact conditions, achieving buffering and energy absorption, and further reducing the impact force transmitted to the insulating component.

[0013] In some embodiments, the perimeter includes two first sides spaced apart along a first direction and two second sides spaced apart and connected between the two first sides along a second direction. At least one of the first and second sides is provided with a first clearance groove. The first direction, the second direction, and the thickness direction of the end cap intersect each other, and the three directions are not coplanar. This design, with the first clearance groove provided on the first or second side, facilitates the deformation of part of the end cap structure towards the first clearance groove under impact conditions, weakening the impact force, reducing the probability of damaging the internal structure, and improving the reliability of the battery cell.

[0014] In some embodiments, a first clearance groove is provided on a first side portion; the depth of the first clearance groove on the first side portion is denoted as H4, the thickness of the base at the location of the first side portion is denoted as H5, and the distance between the portion of the first side portion facing the end cap and located on the outer periphery of the first clearance groove and the surface of the base facing away from the end cap is denoted as H6, wherein H5≤H4<H6. This design controls the depth H4 of the first clearance groove on the first side portion to be between H5 and H6, ensuring that the first clearance groove does not extend into the interior of the base while meeting the structural deformation requirements of the end cap under impact conditions, thus reducing damage to the structural strength of the base.

[0015] In some embodiments, the width of the first clearance groove on the first side along the second direction is denoted as W1, and the width of the first side along the second direction is denoted as W2, wherein the sum of the first clearance grooves W1 on the first side is less than W2. This design controls the sum of the first clearance grooves W1 to be less than W2, allowing the remaining structural portion to contact the end cap, thus ensuring a stable connection between the end cap and the insulating component and improving the structural stability.

[0016] In some embodiments, a first clearance groove is provided on the second side; the depth of the first clearance groove on the second side is denoted as H7, the thickness of the second side on the base at the location of the second side is denoted as H8, and the distance between the portion of the second side facing the end cap and located on the outer periphery of the first clearance groove and the surface of the base facing away from the end cap is denoted as H9, wherein H8≤H7<H9. This design controls the depth H7 of the first clearance groove on the second side to be between H8 and H9, ensuring that the first clearance groove does not extend into the interior of the base while meeting the structural deformation requirements of the end cap under impact conditions, thus reducing damage to the structural strength of the base.

[0017] In some embodiments, the width of the first clearance groove on the second side along the first direction is denoted as W3, and the width of the second side along the first direction is denoted as W4, wherein the sum of the first clearance grooves W3 on the second side is less than W4. This design controls the sum of the first clearance grooves W3 to be less than W4, allowing the remaining structural portion to contact the end cap, thus ensuring a stable connection between the end cap and the insulating component and improving the structural stability.

[0018] In some embodiments, the clearance groove further includes a second clearance groove, which is disposed on the surface of the end cap facing the insulating member and is disposed opposite to the first clearance groove. With the second clearance groove opposite to the first clearance groove, under impact conditions, a portion of the end cap can deform toward the second clearance groove and the first clearance groove, further weakening the impact force and reducing the probability of the internal structure being crushed.

[0019] In some embodiments, the battery cell further includes a housing and an electrode assembly. An end cap is disposed within the housing, the electrode assembly is housed between the end cap and the housing and is electrically connected to electrode terminals, and an insulating member is disposed on the surface of the end cap facing the electrode assembly. This design provides a clearance space between the end cap and the insulating member, reducing impact force, lowering the probability of the electrode assembly being damaged by pressure, and improving the reliability of the battery cell.

[0020] Secondly, this application provides a battery device, which includes any of the above-mentioned battery cells.

[0021] Thirdly, this application provides an electrical device that includes the battery device described above. Attached Figure Description

[0022] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0023] Figure 2 Exploded views of battery devices provided in some embodiments of this application.

[0024] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0025] Figure 4 The image shows a front view of the structure of a battery cell provided in some embodiments of this application.

[0026] Figure 5 for Figure 4 A cross-sectional view of the structure along the AA direction.

[0027] Figure 6 This is a schematic diagram of the structure of an insulating member without reinforcing protrusions provided in some embodiments of this application.

[0028] Figure 7 A front view of the structure of a battery cell provided for other embodiments of this application.

[0029] Figure 8 for Figure 7 A cross-sectional view of the structure along the BB direction.

[0030] Figure 9 A perspective view of the structure of an insulating member with a reinforcing protrusion provided for some embodiments of this application.

[0031] Figure 10 for Figure 9 Enlarged view of the structure at point C in the middle circle.

[0032] Figure 11 Another perspective view of the structure of an insulating member with a reinforcing protrusion provided for some embodiments of this application.

[0033] Figure 12 for Figure 11 A cross-sectional view of the structure along the DD direction.

[0034] Figure 13 for Figure 11 A partial sectional view of the structure along the EE direction.

[0035] Figure 14 This is a schematic diagram of the end cap structure provided in some embodiments of this application.

[0036] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Battery Cell; 20, Housing; 201, First Part; 202, Second Part; 1, End Cap; 11, Second Clearance Groove; 2, Electrode Terminal; 3, Insulator; 31, Main Body; 32, End Component; 321, Base; 322, Bottom; 323, Surrounding Edge; 32a, First Side; 32b, Second Side; 32c, First Clearance Groove; 324, Reinforcing Protrusion; 4, Clearance Space; 5, Electrode Assembly; 6, Housing; 61, Opening; X, First Direction; Y, Second Direction. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 power battery applications, market demand is also constantly increasing.

[0044] With the increasing market share of new energy vehicles, the market demand for reliable battery performance is rising. As the smallest unit of a battery, the reliability of the battery cell directly affects the overall battery reliability. A battery cell typically includes an end cap, a housing, and electrode assemblies. The electrode assemblies are housed between the end cap and the housing. To achieve insulation between the end cap and the housing, an insulating component is also provided on the surface of the end cap facing the electrode assembly. However, under impact conditions, when the shoulder of the end cap is subjected to impact force, the shoulder deforms and damages the electrode assembly through the insulating component, increasing the risk of internal short circuits in the electrode assembly and reducing the reliability of the battery cell.

[0045] Based on this, to address the problem that traditional battery cells are prone to damaging the electrode assembly at the shoulder during impact conditions, thus reducing the reliability of the battery cell, this application provides a battery cell in which a clearance space is formed between the end part of the insulating component located on the electrode terminal side and the end cap. In this way, when the part of the end cap located on the electrode terminal side is impacted, the end cap can deform into the clearance space, effectively reducing the impact force. At the same time, it also reduces the probability of the impact force being directly transmitted from the end cap to the insulating component, thereby reducing the probability of damaging the internal structure of the battery cell at the shoulder during impact conditions, and thus reducing the possibility of internal short circuits, which is beneficial to improving the reliability of the battery cell.

[0046] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application.

[0047] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0049] 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. The battery device 100 can be located at the bottom 322, the front, or the 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.

[0050] 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.

[0051] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 provides a space for housing the battery cell 10, and the housing 20 can have various structures. In some embodiments, the housing 20 may include a first portion 201 and a second portion 202, which overlap each other, together defining a space for housing the battery cell 10. The second portion 202 may be a hollow structure with an opening 61 at one end, and the first portion 201 may be a plate-like structure, covering the opening 61 side of the second portion 202, so that the first portion 201 and the second portion 202 together define the space; alternatively, the first portion 201 and the second portion 202 may both be hollow structures with an opening 61 on one side, with the opening 61 side of the first portion 201 covering the opening 61 side of the second portion 202. Of course, the box 20 formed by the first part 201 and the second part 202 can be of various shapes, such as cylinder, cuboid, etc.

[0052] In the battery device 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery module, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0053] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0054] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 10 provided in some embodiments of this application. The battery cell 10 refers to the smallest unit that makes up a battery. For example... Figure 3 The battery cell 10 includes an end cap 1, a housing 6, an electrode assembly 5, and other functional components.

[0055] End cap 1 refers to a component that covers the opening 61 of housing 6 to isolate the internal environment of battery cell 10 from the external environment. The shape of end cap 1 can be adapted to the shape of housing 6 to fit the housing 6. Optionally, end cap 1 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 1 is not easily deformed under pressure and impact, allowing battery cell 10 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 2 can be provided on end cap 1. Electrode terminals 2 can be used for electrical connection with electrode assembly 5 to output or input electrical energy to battery cell 10. In some embodiments, end cap 1 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 10 reaches a threshold. The material of end cap 1 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating member 3 may be provided on the inner side of the end cap 1. The insulating member 3 can be used to isolate the electrical connection components inside the housing 6 from the end cap 1 to reduce the risk of short circuit. For example, the insulating member 3 may be made of plastic, rubber, etc.

[0056] The housing 6 is a component used to cooperate with the end cap 1 to form the internal environment of the battery cell 10. This internal environment can accommodate the electrode assembly 5, electrolyte, and other components. The housing 6 and the end cap 1 can be independent components. An opening 61 can be provided on the housing 6, and the end cap 1 can close the opening 61 to form the internal environment of the battery cell 10. Alternatively, the end cap 1 and the housing 6 can be integrated. Specifically, the end cap 1 and the housing 6 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 6, the end cap 1 closes the housing 6. The housing 6 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 6 can be determined according to the specific shape and size of the electrode assembly 5. The material of the housing 6 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0057] Electrode assembly 5 is the component in the battery cell 10 where the electrochemical reaction occurs. The casing 6 may contain one or more electrode assemblies 5. Electrode assembly 5 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 5, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 2 to form a current loop.

[0058] According to some embodiments of this application, please refer to Figures 4 to 6 This application provides a battery cell 10, which includes an end cap 1, two electrode terminals 2, and an insulating member 3. The two electrode terminals 2 are spaced apart from each other along a first direction X on the end cap 1, and the insulating member 3 is disposed on the surface of the end cap 1 along its thickness direction. The insulating member 3 includes a main body 31 and end parts 32 respectively disposed at both ends of the main body 31. The two end parts 32 are respectively located on opposite sides of the two electrode terminals 2 along the first direction X, and at least one end part 32 has a clearance space 4 between itself and the end cap 1.

[0059] End cap 1 refers to a component that covers the opening 61 of housing 6 to isolate the internal environment of battery cell 10 from the external environment. It includes an outer surface and an inner surface that are opposite to each other along its thickness direction. The outer surface is disposed facing the outside of battery cell 10, and the inner surface is disposed facing the inside of battery cell 10. The insulating member 3 may be disposed on the inner surface.

[0060] Electrode terminals 2 are components used for outputting or inputting electrical energy. They are located on the end cover 1 and can penetrate both the outer and inner surfaces, facilitating electrical connection with the internal and external structures of the battery cell 10, respectively. Two electrode terminals 2 are spaced apart on the end cover 1, one of which can serve as the positive electrode terminal 2, and the other as the negative electrode terminal 2. When the battery cell 10 is subjected to impact conditions, such as a bottom ball impact, the portions of the end cover 1 located on the opposite sides of the two electrode terminals 2 will deform towards the insulating component 3 after being impacted. This causes the insulating component 3 to deform structurally, pressing against the internal structure of the battery cell 10, such as the electrode assembly 5. This can damage the electrode plates of the electrode assembly 5, increasing the risk of internal short circuits.

[0061] Therefore, in this embodiment, the insulating component 3 is divided into three parts: a main body 31 and two end components 32. A clearance space 4 is provided between at least one end component and the inner surface of the end cap 1. When the shoulder of the end cap 1 is impacted, the portion of the end cap 1 can deform into the clearance space 4, effectively reducing the impact force. This also reduces the probability of the impact force being directly transmitted from the end cap 1 to the insulating component 3, thereby reducing the probability of damaging the internal structure of the battery cell 10 at the shoulder during impact conditions, thus reducing the likelihood of internal short circuits and improving the reliability of the battery cell 10. Specifically, in some examples, clearance spaces 4 are provided between both end components 32 and the end cap 1.

[0062] The two end components 32 are located on opposite sides of the two electrode terminals 2, which can be understood as the end component 32 being located on the side of one electrode terminal 2 away from the other electrode terminal 2. Specifically, in some examples, one end component 32 is located on the side of the positive electrode terminal 2 away from the negative electrode terminal 2, and the other end component 32 is located on the side of the negative electrode terminal 2 away from the positive terminal; that is, the two end components 32 are located at the shoulder of the end cap 1. The connection between the two end components 32 and the main body 31 can be by bolt connection, pin connection, or adhesive bonding; it can also be a one-piece molding connection, such as injection molding, die casting, or 3D printing.

[0063] Meanwhile, a clearance space 4 exists between a portion of the end component 32 and the end cap 1. This portion of the end component 32 can be its middle section, such as a structure located in the middle of the surface of the end component 32 facing the end cap 1. This structure has a gap with the end cap 1, is not connected, or is disconnected, allowing the end cap 1 to deform towards the clearance space 4 after being impacted, reducing the direct transmission of impact force to the insulating component 3. Of course, it can also be any other part of the end component 32.

[0064] In addition, there are several ways to form the clearance space 4. For example, a concave structure can be recessed at the position corresponding to the end cap 1, and a clearance space 4 can be formed between the concave structure and the end component 32; or, a concave structure can be recessed in part of the end component 32, and a clearance space 4 can be formed between the concave structure and the end cap 1; or, concave structures can be recessed on the surfaces of the end cap 1 and the end component 32 facing each other, and the two concave structures enclose each other to form the clearance space 4.

[0065] This design reduces the probability of damaging the internal structure of the battery cell 10 at the shoulder during impact conditions, thereby reducing the possibility of internal short circuits and improving the reliability of the battery cell 10.

[0066] Optionally, according to some embodiments of this application, please refer to Figure 5 and Figure 6 Each end component 32 includes a base 321 and a perimeter 323 surrounding the base 321. The base 321 is connected to the main body 31, and the perimeter 323 is in contact with the surface of the end cap 1. At least one end component 32 forms a clearance space 4 between the base 321 and the end cap 1.

[0067] The base 321 refers to the structure located at both ends of the main body 31 along the first direction X. A surrounding edge 323 is arranged around the base 321, and the structure encircled by the surrounding edge 323 on the base 321 may be part of the end component 32. The surrounding edge 323 contacts the surface of the end cap 1, allowing the end cap 1 and the end component 32 to remain connected, preventing the end component 32 from being suspended relative to the end cap 1, thus improving the stability of the structure between the end cap 1 and the insulating member 3. In some specific examples, the structure of the surrounding edge 323, except for the portion near the main body 31, may contact the edge of the end cap 1.

[0068] Among them, the edging 323, the base 321 and the main body 31 are all integrated structures, which can improve the overall structural stability of the insulating component 3.

[0069] This design, with the end component 32 designed as a base 321 and a surrounding edge 323, facilitates the formation of a clearance space 4 between the base 321 and the end cover 1, thereby reducing the probability of damage to the internal structure of the battery cell 10 under impact conditions and improving the reliability of the battery cell 10.

[0070] Optionally, according to some embodiments of this application, please refer to Figure 5 Each base 321 includes a bottom 322 and a surrounding edge 323 encircling the outer periphery of the bottom 322. In the end member 32 with a clearance space 4, the clearance space 4 is formed between the surface of the bottom 322 and the end cap 1.

[0071] There is a clearance space 4 between the surface of the bottom 322 and the end cap 1. It can be seen that no other structure is provided between the bottom 322 and the end cap 1. For example, in this embodiment, no reinforcing structure is provided between the bottom 322 and the end cap 1. In this example, the clearance space 4 is directly formed between the surface of the bottom 322 and the surface of the end cap 1, which can increase the size of the clearance space 4, so that the deformation of the end cap 1 towards the clearance space 4 can be increased, thereby increasing the buffering and weakening ability against impact, and thus reducing the probability of damage to the internal structure under impact conditions.

[0072] This design creates a clearance space 4 between the bottom 322 and the end cap 1. Increasing the size of the clearance space 4 allows the end cap 1 to increase its deformation in the clearance space 4, thereby increasing its ability to buffer and weaken impacts and reducing the probability of damage to the internal structure under impact conditions.

[0073] Optionally, according to some embodiments of this application, please refer to Figures 7 to 10 Each base 321 includes a bottom 322 and a reinforcing protrusion 324. A perimeter 323 is arranged around the outer periphery of the bottom 322. The reinforcing protrusion 324 is located on the surface of the bottom 322 facing the end cap 1 and is located within the perimeter 323. In the end member 32 with a clearance space 4, the clearance space 4 is formed between the reinforcing protrusion 324 of the base 321 and the end cap 1.

[0074] A reinforcing protrusion 324 is provided on the bottom 322 and surrounded by a perimeter 323 to increase the overall structural strength of the base 321. A clearance space 4 is formed between the reinforcing protrusion 324 and the end cap 1, so that when the shoulder of the end cap 1 is impacted, the end cap 1 can deform toward one end of the reinforcing protrusion 324 to weaken the impact force.

[0075] The number of reinforcing protrusions 324 on the bottom 322 can be one or more. When there are multiple reinforcing protrusions 324, their distribution can be in various ways, such as: each reinforcing protrusion 324 is distributed at intervals along the first direction X; or, each reinforcing protrusion 324 is arranged in a cross pattern on the bottom 322.

[0076] In addition, one end of the reinforcing protrusion 324 may extend beyond the surrounding edge 323 or not. When one end of the reinforcing protrusion 324 extends beyond the surrounding edge 323, a concave structure may be provided at the corresponding position of the end cap 1, so that a clearance space 4 is formed between the concave structure and one end of the reinforcing protrusion 324.

[0077] This design introduces a reinforcing protrusion 324 on the bottom 322, which not only improves the overall structural strength of the end component 32, but also facilitates the deformation of part of the end cover 1 into the clearance space 4 under impact conditions, thereby weakening the impact force and improving the reliability of the battery cell 10.

[0078] Optionally, according to some embodiments of this application, please refer to Figure 8 In the base 321 with clearance space 4, the height of the reinforcing protrusion 324 protruding from the bottom 322 is lower than the height of the perimeter 323 protruding from the bottom 322.

[0079] The height of the reinforcing protrusion 324 on the bottom 322 is lower than that of one end of the edge 323, so that a height difference is formed between the edge 323 and the reinforcing protrusion 324. In this way, when one end of the edge 323 contacts the surface of the end cap 1, the reinforcing protrusion 324 will not contact the end cap 1, and a gap can be formed between the two.

[0080] This design, which strengthens the protrusion 324 by placing it below the surrounding edge 323, makes it easier to form a clearance space 4 between the strengthened protrusion 324 and the end cap 1, which helps to reduce the impact force and improve the reliability of the battery cell 10.

[0081] Optionally, according to some embodiments of this application, please refer to Figure 11 and Figure 12 The distance between the end of the reinforcing protrusion 324 away from the bottom 322 and the surface of the bottom 322 facing away from the end cap 1 is denoted as H1, the thickness of the bottom 322 at the location of the reinforcing protrusion 324 is denoted as H2, and the distance between the surface of the bottom 322 facing away from the reinforcing protrusion 324 and the surface of the perimeter 323 facing the end cap 1 is denoted as H3, wherein H2

[0082] If the distance H1 is greater than the thickness H2, it indicates that the reinforcing protrusion 324 protrudes from the surface of the bottom 322; if the distance H1 is less than or equal to 0.5H3, for example, the distance H1 can be, but is not limited to, 0.5H3, 0.45H3, 0.40H3, 0.35H3, etc. It can be seen that one end of the reinforcing protrusion 324 is at least 0.5H3 lower than the end of the surrounding edge 323, so that a sufficiently large clearance space 4 is formed between the reinforcing protrusion 324 and the end cap 1.

[0083] This design, which controls the distance H1 between H2 and 0.5×H3, not only strengthens the overall structural strength of the end component 32, but also provides sufficient clearance space 4 between the reinforcing protrusion 324 and the end cover 1, reducing the impact force and improving the reliability of the battery cell 10.

[0084] According to some embodiments of this application, optionally, in the base 321 having clearance space 4, at least one of the two surfaces of the perimeter 323 and the end cap 1 facing each other is provided with clearance groove.

[0085] ​It is known that under the stamping condition, the end cap 1 of the battery cell 10 can deform not only into the clearance space 4, but also into the clearance groove, further weakening the impact force. The clearance groove can be set on the surrounding edge 323, or it can be set at the position corresponding to the end cap 1 and the surrounding edge 323; or the clearance groove can be set on the surrounding edge 323 and the end cap 1 respectively.

[0086] When the clearance grooves are respectively provided on the perimeter 323 and the end cap 1, the clearance grooves of the perimeter 323 and the end cap 1 can be staggered or oppositely distributed. When the clearance grooves of the perimeter 323 and the end cap 1 are opposite each other, the deformable space between the perimeter 323 and the end cap 1 can be increased, improving the energy absorption performance and thus improving the reliability of the battery cell 10.

[0087] This design introduces a clearance groove between the perimeter 323 and the end cap 1, allowing the end cap 1 to deform not only toward the clearance space 4 but also to undergo structural deformation within the clearance groove, further reducing the impact force and improving the reliability of the battery cell 10.

[0088] Optionally, according to some embodiments of this application, please refer to Figure 10 The clearance groove includes a first clearance groove 32c, which is disposed on the surface of the perimeter 323 facing the end cap 1 and extends through the perimeter 323 along its thickness direction.

[0089] The first clearance groove 32c is provided through the thickness direction of the surrounding edge 323, so that the end cap 1 can deform better into the first clearance groove 32c. The first clearance groove 32c can be a continuous groove structure or a shear structure on the surrounding edge 323. For example, there are multiple first clearance grooves 32c, and each first clearance groove 32c is distributed at intervals along the circumference of the surrounding edge 323.

[0090] Meanwhile, the depth of the first clearance groove 32c can be determined according to actual needs. For example, the first clearance groove 32c can extend to the bottom 322; or the depth of the first clearance groove 32c can be half the height of the surrounding edge 323.

[0091] With this design, a first clearance groove 32c is provided on the perimeter 323, which facilitates the deformation of part of the end cover 1 into the first clearance groove 32c under impact conditions, thereby achieving buffering and energy absorption, and further reducing the impact force transmitted to the insulating component 3.

[0092] Optionally, according to some embodiments of this application, please refer to Figure 10The perimeter 323 includes two first side portions 32a spaced apart along the first direction X, and two second side portions 32b spaced apart and connected between the two first side portions 32a along the second direction Y. At least one of the first side portions 32a and the second side portions 32b is provided with a first clearance groove 32c. The first direction X, the second direction Y and the thickness direction of the end cap 1 intersect each other, and the three are not coplanar.

[0093] It can be seen that the perimeter 323 has a quadrilateral structure, and the first clearance groove 32c can be provided on at least one first side 32a; it can also be provided on at least one second side 32b; of course, it can also be provided on both the first side 32a and the second side 32b respectively. In some specific examples, the first clearance groove 32c is provided on each first side 32a and each second side 32b. At the same time, the number of first clearance grooves 32c on each first side 32a and each second side 32b is at least two.

[0094] The first side 32a and the second side 32b can be connected by welding, bolting, snap-fitting, or other methods, or they can be designed as an integrated structure.

[0095] With this design, a first clearance groove 32c is provided on the first side 32a or the second side 32b, which facilitates the deformation of part of the end cover 1 towards the first clearance groove 32c under impact conditions, thereby weakening the impact force, reducing the probability of damaging the internal structure, and improving the reliability of the battery cell 10.

[0096] Optionally, according to some embodiments of this application, please refer to Figure 12 The first clearance groove 32c is provided on the first side 32a; the depth of the first clearance groove 32c on the first side 32a is denoted as H4, the thickness of the first side 32a on the base 321 at the location of the first side 32a is denoted as H5, and the distance between the part of the first side 32a facing the end cover 1 and located on the outer periphery of the first clearance groove 32c and the surface of the base 321 facing away from the end cover 1 is denoted as H6, wherein H5≤H4<H6.

[0097] When the depth H4 of the first clearance groove 32c is equal to the thickness H5, it indicates that the first clearance groove 32c extends onto the base 321; and when the depth H4 is less than the distance H6, it indicates that the depth of the first clearance groove 32c is greater than 0. The base 321 includes a bottom 322, and the thickness of the first edge 32a on the base 321, denoted as H5, can be understood as the thickness of the bottom 322.

[0098] In some specific examples, the depth H4, thickness H5, and distance H6 also satisfy the condition: H5≤H4≤0.5×H6.

[0099] This design controls the depth H4 of the first clearance groove 32c on the first side 32a to between H5 and H6, so that the first clearance groove 32c does not extend into the interior of the base 321 while satisfying the structural deformation of the end cover 1 under impact conditions, thereby reducing damage to the structural strength of the base 321.

[0100] Optionally, according to some embodiments of this application, please refer to Figure 12 The width of the first clearance groove 32c on the first side 32a along the second direction Y is denoted as W1, and the width of the first side 32a along the second direction Y is denoted as W2, wherein the sum of W1 of each of the first clearance grooves 32c on the first side 32a is < W2.

[0101] The sum of W1 in the first clearance groove 32c is less than W2, indicating that the first side 32a still has a portion not occupied by the first clearance groove 32c, so that part of the structure of the first side 32a can contact the end cover 1, so that the end cover 1 and the insulating member 3 are stably connected.

[0102] This design ensures that the sum of W1 in the first clearance groove 32c is less than W2, allowing the remaining structure to contact the end cap 1, thus achieving a stable connection between the end cap 1 and the insulating component 3 and improving the stability of the structure.

[0103] According to some embodiments of this application, optionally, the first clearance groove 32c is provided on the second side portion 32b; the depth of the first clearance groove 32c on the second side portion 32b is denoted as H7, the thickness of the second side portion 32b on the base 321 at the location of the second side portion 32b is denoted as H8, and the distance between the portion of the second side portion 32b facing the end cover 1 and located on the outer periphery of the first clearance groove 32c and the surface of the base 321 facing away from the end cover 1 is denoted as H9, wherein H8≤H7<H9.

[0104] When the depth H7 of the first clearance groove 32c is equal to the thickness H8, it indicates that the first clearance groove 32c extends onto the base 321; and when the depth H7 is less than the distance H9, it indicates that the depth of the first clearance groove 32c is greater than 0. The base 321 includes a bottom 322, and the thickness of the second side 32b on the base 321, denoted as H8, can be understood as the thickness of the bottom 322.

[0105] In some specific examples, the depth H7, thickness H8, and distance H9 also satisfy the condition: H8≤H7≤0.5×H9.

[0106] This design controls the depth H7 of the first clearance groove 32c on the second side 32b to between H8 and H9, so that the first clearance groove 32c does not extend into the interior of the base 321 while satisfying the structural deformation of the end cap 1 under impact conditions, thus reducing damage to the structural strength of the base 321.

[0107] Optionally, according to some embodiments of this application, please refer to Figure 13 The width of the first clearance groove 32c on the second side 32b along the first direction X is denoted as W3, and the width of the second side 32b along the first direction X is denoted as W4, wherein the sum of W3 of each of the first clearance grooves 32c on the second side 32b is less than W4.

[0108] The sum of the first clearance grooves 32c and W3 is less than W4, indicating that the second side 32b still has a portion not occupied by the first clearance grooves 32c, so that part of the structure of the second side 32b can contact the end cap 1, so that the end cap 1 and the insulating member 3 are stably connected.

[0109] This design ensures that the sum of the first clearance grooves 32cW3 is less than W4, allowing the remaining structure to contact the end cap 1, thus ensuring a stable connection between the end cap 1 and the insulating component 3 and improving the stability of the structure.

[0110] Optionally, according to some embodiments of this application, please refer to Figure 14 The clearance groove also includes a second clearance groove 11, which is disposed on the surface of the end cap 1 facing the insulating member 3 and is disposed opposite to the first clearance groove 32c.

[0111] The second clearance groove 11 is opposite to the first clearance groove 32c, meaning that the second clearance groove 11 and the first clearance groove 32c are connected. In this way, under impact conditions, part of the end cover 1 can deform towards the second clearance groove 11 and the first clearance groove 32c, further weakening the impact force and reducing the probability of the internal structure being crushed.

[0112] The size of the second clearance groove 11 along the first direction X can be greater than or equal to the size of the first clearance groove 32c.

[0113] With this design, the second clearance groove 11 is opposite to the first clearance groove 32c. Under impact conditions, part of the end cover 1 can deform towards the second clearance groove 11 and the first clearance groove 32c, further weakening the impact force and reducing the probability of the internal structure being crushed.

[0114] Optionally, according to some embodiments of this application, please refer to Figure 3 The battery cell 10 also includes a housing 6 and an electrode assembly 5. An end cap 1 is disposed on the housing 6, the electrode assembly 5 is housed between the end cap 1 and the housing 6 and is electrically connected to the electrode terminal 2, and an insulating member 3 is disposed on the surface of the end cap 1 facing the electrode assembly 5.

[0115] Electrode assembly 5 refers to the component in the battery cell 10 where the electrochemical reaction occurs. It is mainly formed by winding or stacking positive and negative electrode plates, and a separator is usually provided between the positive and negative electrode plates. A clearance space 4 is provided between the end cap 1 and the insulating component 3. When the battery cell 10 is subjected to impact conditions, part of the end cap 1 can deform towards the clearance space 4, weakening the impact force, reducing the probability of the electrode assembly 5 being damaged, and improving the reliability of the battery cell 10.

[0116] This design provides a clearance space 4 between the end cap 1 and the insulating component 3, which weakens the impact force, reduces the probability of the electrode assembly 5 being damaged, and improves the reliability of the battery cell 10.

[0117] According to some embodiments of this application, this application provides a battery device 100, which includes a battery cell 10 as described above.

[0118] According to some embodiments of this application, this application provides an electrical device that includes the battery device 100 described above.

[0119] According to some embodiments of this application, please refer to Figures 3 to 14 This application provides a battery cell 10, which includes an end cap 1, electrode terminals 2, an insulating member 3, an electrode assembly 5, and a housing 6. The end cap 1 is disposed on the housing 6. Two electrode terminals 2 are spaced apart on the end cap 1 along a first direction X. The electrode assembly 5 is housed between the end cap 1 and the housing 6 and is electrically connected to the electrode terminals 2. The insulating member 3 is disposed on the surface of the end cap 1 facing the electrode assembly 5. The insulating member 3 includes a main body 31 and end members 32 disposed at both ends of the main body 31. Each end member 32 includes a base 321 and a perimeter 323 surrounding the base 321. The base 321 may include a bottom 322; it may also include a bottom 322 and a reinforcing protrusion 324 disposed on the bottom 322. A clearance space 4 can be formed between the surface of the bottom 322 and the end cap 1, and a clearance space 4 can also be formed between the reinforcing protrusion 324 and the end cap 1.

[0120] Meanwhile, each perimeter 323 includes two first side portions 32a spaced apart along the first direction X, and is connected between the two first side portions 32a spaced apart along the second direction Y. Each first side portion 32a and each second side portion 32b is provided with a first clearance groove 32c, and a second clearance groove 11 is provided on the end cap 1 at the position corresponding to the perimeter 323.

[0121] 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.

[0122] 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, The battery cell includes: End cap (1); Two electrode terminals (2) are spaced apart on the end cap (1) along a first direction (X); An insulating element (3) is disposed on the surface of the end cap (1) along its own thickness direction; The insulating component (3) includes a main body (31) and end components (32) respectively disposed at both ends of the main body (31). The two end components (32) are respectively located on opposite sides of the two electrode terminals (2) along the first direction (X). At least one end component (32) has a clearance space (4) between itself and the end cap (1).

2. The battery cell according to claim 1, characterized in that, Each of the end components (32) includes a base (321) and a perimeter (323) surrounding the base (321). The base (321) is connected to the main body (31), and the perimeter (323) contacts the surface of the end cap (1). The clearance space (4) is formed between the base (321) of at least one end component (32) and the end cap (1).

3. The battery cell according to claim 2, characterized in that, Each of the bases (321) includes a bottom (322), and the perimeter (323) is arranged around the outer periphery of the bottom (322). In the end member (32) having the clearance space (4), the clearance space (4) is formed between the surface of the bottom (322) and the end cap (1).

4. The battery cell according to claim 2, characterized in that, Each of the bases (321) includes a bottom (322) and a reinforcing protrusion (324). The rim (323) is arranged around the outer periphery of the bottom (322). The reinforcing protrusion (324) is located on the surface of the bottom (322) facing the end cap (1) and is located within the rim (323). In the end member (32) having the clearance space (4), the clearance space (4) is formed between the reinforcing protrusion (324) and the end cap (1).

5. The battery cell according to claim 4, characterized in that, In the base (321) having the clearance space (4), the height of the reinforcing protrusion (324) protruding from the bottom (322) is lower than the height of the perimeter (323) protruding from the bottom (322).

6. The battery cell according to claim 5, characterized in that, The distance between the end of the reinforcing protrusion (324) away from the bottom (322) and the surface of the bottom (322) facing away from the end cap (1) is denoted as H1, the thickness of the bottom (322) at the location of the reinforcing protrusion (324) is denoted as H2, and the distance between the surface of the bottom (322) facing away from the reinforcing protrusion (324) and the surface of the perimeter (323) facing the end cap (1) is denoted as H3, wherein H2 < H1 ≤ 0.5 × H3.

7. The battery cell according to any one of claims 2-6, characterized in that, In the base (321) having the clearance space (4), at least one of the two surfaces of the perimeter (323) and the end cap (1) facing each other is provided with a clearance groove.

8. The battery cell according to claim 7, characterized in that, The clearance groove includes a first clearance groove (32c), which is disposed on the surface of the perimeter (323) facing the end cap (1) and extends through the perimeter (323) along its thickness direction.

9. The battery cell according to claim 8, characterized in that, The perimeter (323) includes two first side portions (32a) spaced apart along the first direction (X) and two second side portions (32b) spaced apart and connected between the two first side portions (32a) along the second direction (Y). At least one of the first side portions (32a) and the second side portions (32b) is provided with the first clearance groove (32c). The thickness directions of the first direction (X), the second direction (Y) and the end cap (1) intersect each other and are not coplanar.

10. The battery cell according to claim 9, characterized in that, The first clearance groove (32c) is provided on the first side portion (32a); the depth of the first clearance groove (32c) on the first side portion (32a) is denoted as H4, the thickness of the first side portion (32a) on the base (321) at the location of the first side portion (32a) is denoted as H5, and the distance between the portion of the first side portion (32a) facing the end cap (1) and located on the outer periphery of the first clearance groove (32c) and the surface of the base (321) facing away from the end cap (1) is denoted as H6, wherein H5≤H4<H6; and / or, The width of the first clearance groove (32c) on the first side (32a) along the second direction (Y) is denoted as W1, and the width of the first side (32a) along the second direction (Y) is denoted as W2, wherein the sum of W1 of each of the first clearance grooves (32c) on the first side (32a) is < W2.

11. The battery cell according to claim 9, characterized in that, The first clearance groove (32c) is provided on the second side (32b); the depth of the first clearance groove (32c) on the second side (32b) is denoted as H7, the thickness of the second side (32b) on the base (321) at the location of the second side (32b) is denoted as H8, and the distance between the portion of the second side (32b) facing the end cap (1) and located on the outer periphery of the first clearance groove (32c) and the surface of the base (321) facing away from the end cap (1) is denoted as H9, wherein H8≤H7<H9; and / or, The width of the first clearance groove (32c) on the second side (32b) along the first direction (X) is denoted as W3, and the width of the second side (32b) along the first direction (X) is denoted as W4, wherein the sum of W3 of each of the first clearance grooves (32c) on the second side (32b) is < W4.

12. The battery cell according to claim 8, characterized in that, The clearance groove also includes a second clearance groove (11), which is disposed on the surface of the end cap (1) facing the insulating member (3) and is disposed opposite to the first clearance groove (32c).

13. The battery cell according to any one of claims 2-6, characterized in that, The battery cell also includes a housing (6) and an electrode assembly (5). The end cap (1) is disposed on the housing (6). The electrode assembly (5) is housed between the end cap (1) and the housing (6) and is electrically connected to the electrode terminal (2). The insulating member (3) is disposed on the surface of the end cap (1) facing the electrode assembly (5).

14. A battery device, characterized in that, The battery device includes the battery cell according to any one of claims 1-13.

15. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 14.

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