Battery cell, battery device, and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell assembly, the top end of the shell assembly is sunken downwards along the height direction of the shell assembly to form a groove; the two pole columns are oppositely arranged at an interval and are arranged in the groove; and at least partial areas of the orthographic projections of the two pole columns in the side surface of the shell assembly along the thickness direction are overlapped. The battery monomer, the battery device and the power utilization device provided by the embodiment of the utility model have the advantage of relatively high space utilization rate.

Description

Technical Field

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

[0002] Batteries are widely used in various electrical devices, such as music players, mobile phones, computers, and electric vehicles. In related technologies, the positive and negative terminals of adjacent battery cells are generally connected by a tab; however, this structural connection arrangement results in low battery space utilization. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell, a battery device, and an electrical device to address the problem of low space utilization.

[0004] A first aspect of this application provides a battery cell, comprising: a housing assembly having a groove recessed downward along its height direction at its top end; and two opposingly spaced poles, both disposed in the groove; at least a portion of the orthographic projections of the two poles onto the side surface of the housing assembly along its thickness direction overlap.

[0005] By setting two poles whose orthographic projections overlap at least partially on the side of the housing assembly along its thickness direction, the two poles can maximize the length of their connectable sections within the limited space of the groove. This facilitates the connection between the poles and the plate, avoids the use of irregularly shaped plates for oblique connection, reduces the flow path length, and effectively improves space utilization.

[0006] In one embodiment, each pole post includes an integrally connected base and an extension; the extension extends along the length direction of the housing assembly; the bases of two pole posts are spaced apart relative to each other along the length direction of the housing assembly; the extensions of two pole posts are spaced apart relative to each other along the thickness direction of the housing assembly. By setting the bases of the two pole posts to be spaced apart relative to each other along the length direction of the housing assembly, and the extensions of the two pole posts to be spaced apart relative to each other along the thickness direction of the housing assembly, the two pole posts can extend their own area as much as possible within the limited space of the groove, thereby facilitating connection with the plate and avoiding the use of irregularly shaped plates for oblique connection, thus effectively improving space utilization.

[0007] In one embodiment, each of the poles has an L-shaped structure; the two poles are symmetrically arranged in the groove.

[0008] In one embodiment, the groove depth is A, 0.5mm≤A≤10mm; the height of each pole post is B, 1mm≤B≤10mm.

[0009] In one embodiment, the housing assembly includes a housing and an end cap; the end cap closes onto an opening in the housing; the center of the end cap is recessed downward to form the groove. By recessing the center of the end cap to form the groove, at least a portion of the two terminals is accommodated within the groove, thereby preventing the terminals from contacting external structures and reducing the possibility of leakage.

[0010] In one embodiment, the groove extends through the end cap along the thickness direction of the housing assembly.

[0011] In one embodiment, the thickness of the housing assembly is C along the thickness direction, where 8mm ≤ C ≤ 100mm; the length of the housing assembly is D along the length direction, where 120mm ≤ D ≤ 500mm; and the height of the housing assembly is E along the height direction, where 50mm ≤ E ≤ 300mm. The height direction, length direction, and thickness direction of the housing assembly are perpendicular to each other.

[0012] In one embodiment, the battery cell includes a pressure relief mechanism; the pressure relief mechanism is disposed on the side of the housing along the length direction of the housing assembly. The pressure relief mechanism can promptly release internal pressure when the internal pressure or temperature of the battery cell reaches a threshold, thereby ensuring battery safety. By placing the pressure relief mechanism on the side of the housing along the length direction Y of the housing assembly, without requiring a constant height, the venting volume occupied by the pressure relief mechanism can be minimized, thus effectively improving space utilization.

[0013] A second aspect of this application provides a battery device including the aforementioned battery cells; the battery cells are arranged along the thickness direction of the housing assembly.

[0014] A third aspect of this application provides a battery device comprising two sets of battery modules, each set of battery modules being formed by arranging a plurality of the aforementioned battery cells along the thickness direction of the housing assembly, each battery cell including a pressure relief mechanism disposed on a side of the housing in the housing assembly, the side being located along the length direction of the housing assembly; wherein the plurality of side surfaces having the pressure relief mechanism together constitute a pressure relief surface; and the pressure relief surfaces of the two sets of battery modules are arranged at intervals relative to each other.

[0015] A fourth aspect of this application provides an electrical device including the battery device described above.

[0016] 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

[0017] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0018] Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application.

[0019] Figure 3 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0020] Figure 4 This is a cross-sectional schematic diagram of the groove region of a battery cell provided in some embodiments of this application, perpendicular to the thickness direction.

[0021] Figure 5 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0022] Figure 6 This is a schematic diagram of the structure of the battery module and housing provided in some embodiments of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] Vehicles -1000;

[0025] Battery assembly-100, housing-110, first part-111, second part-112, battery module-120, battery cell-121, end cap-122, housing-123, terminal post-125, base-1251, extension-1252, housing assembly-126, groove-129, pressure relief mechanism-130, valve plate-131, controller-200, motor-300;

[0026] Thickness direction - X, length direction - Y, height direction - Z. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] In the description of the embodiments of this application, if the technical terms such as "first" and "second" appear, these terms are used only for descriptive purposes to distinguish different objects, and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0030] 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.

[0031] 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.

[0032] In the description of the embodiments of this application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise explicitly specified. Similarly, if the term "multiple sets" appears, "multiple sets" refers to two or more sets (including two sets), and if the term "multiple pieces" appears, "multiple pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of this application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms 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 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," "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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] 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.

[0036] 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.

[0037] 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 widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0038] In related technologies, a battery cell includes a housing assembly, an electrode assembly, and positive and negative terminals. The positive and negative terminals are fixed to the outer wall of the housing assembly and protrude from the housing assembly, serving to electrically connect the electrode assembly inside the housing assembly to external electrical components. Some housing assemblies have grooves to accommodate the positive and negative terminals, but the space of the grooves themselves limits the size of the positive and negative terminals, resulting in short exposed portions that are unsuitable for connection with a battery pack. Furthermore, when multiple battery cells are stacked together, it is found that while adjacent battery cells' positive and negative terminals are connected via battery packs, the distribution of the positive and negative terminals on opposite sides means that the positive terminal of one battery cell is not on the same side as the negative terminal of the next, often requiring irregularly shaped battery packs for oblique connection, leading to low space utilization.

[0039] To alleviate the problem of low space utilization, a groove can be formed in the recess of the housing component to accommodate two poles, reduce leakage, and make full use of the effective space inside the housing component, thereby improving the volume utilization of the housing component. Within the limited space of the groove, the length of the connectable section of the two poles can be maximized, which facilitates the connection between the poles and the circuit breaker, avoids the use of irregularly shaped circuit breakers for oblique connection, thereby reducing the length of the current path and effectively improving space utilization.

[0040] This application provides a battery cell, a battery device, and an electrical device. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, energy storage products, 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. Energy storage products can include energy storage stations, etc.

[0041] It should be understood that the technical solutions described in the embodiments of this application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including housings and electrical devices using batteries. However, for the sake of brevity, an embodiment of this application using a vehicle 1000 as an example will be used for illustration.

[0042] Please refer to Figure 1 , Figure 1This 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.

[0043] 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.

[0044] Figure 2 Exploded views of the battery device 100 provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application. Figure 6 The diagram shows the structure of the battery module and housing provided in some embodiments of this application. Please refer to... Figure 2 , Figure 5 and Figure 6 To meet different power demands, the battery device 100 may include multiple battery cells 121 and a housing 110. A battery cell 121 is the smallest unit that makes up the battery module 120 or battery pack. Multiple battery cells 121 may be connected in series and / or in parallel via terminals for various applications.

[0045] The housing 110 is used to house the battery cell 121 or battery module 120 to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 121.

[0046] The housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first part 111 and a second part 112, which overlap each other, and together define a receiving space for accommodating the battery cell 121. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure, with the first part 111 covering the open side of the second part 112 so that the first part 111 and the second part 112 together define the receiving space; the first part 111 and the second part 112 may also be hollow structures with one side open, with the open side of the first part 111 covering the open side of the second part 112. Of course, the housing 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The embodiments of this application are not limited in this respect. The material of the housing 110 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. The embodiments of this application are not limited to this.

[0047] In the embodiments of this application, multiple battery cells 121 can be directly assembled into a battery pack, or they can first be assembled into a battery module 120, and then the battery modules 120 can be assembled into a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel, or mixed to form a whole, and then the whole composed of multiple battery cells 121 can be housed in a housing 110. Alternatively, multiple battery cells 121 can first be connected in series, parallel, or mixed to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel, or mixed to form a whole, and housed in a housing 110.

[0048] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 121.

[0049] Each battery cell 121 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 121 can be cylindrical, flat, cuboid, or other shapes. Battery cells 121 are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid battery cells, and pouch battery cells; the embodiments of this application are not limited to these. However, for the sake of brevity, the following embodiments will use a cuboid lithium-ion battery cell 121 as an example for description.

[0050] Figure 3 The diagram shows the structure of a single battery cell provided in some embodiments of this application. Figure 4 This is a cross-sectional schematic diagram of the groove region of a battery cell provided in some embodiments of this application, perpendicular to the thickness direction.

[0051] See Figure 3 and Figure 4 As shown, a first aspect of this application provides a battery cell 121, including a housing assembly 126 and two terminals 125. The top of the housing assembly 126 is recessed downwards along its height direction Z to form a groove 129; the two terminals 125 are disposed opposite to each other, and both terminals 125 are disposed within the groove 129. At least a portion of the orthographic projections of the two terminals 125 onto the side surface of the housing assembly 126 along its thickness direction X overlap.

[0052] That is to say, when projected along the thickness direction X of the housing assembly 126, at least a portion of the two pole posts 125 overlap.

[0053] The housing assembly 126 has a thickness direction X, a length direction Y, and a height direction Z, and the thickness direction X, the length direction Y, and the height direction Z are perpendicular to each other.

[0054] The housing assembly 126 is partially recessed to form a groove 129, meaning that any part of the housing assembly 126 can be recessed to form the groove 129. Specifically, the housing assembly 126 can be recessed at its top end along the height direction Z to form the groove 129.

[0055] Two terminals 125 are arranged at intervals relative to each other. Specifically, one of the two terminals 125 can serve as the positive terminal of the battery cell 121, and the other as the negative terminal of the battery cell 121. The positive and negative terminals can be electrically connected to the electrode assembly respectively for outputting or inputting electrical energy into the battery cell 121.

[0056] Both pole pieces 125 are disposed within the recess 129, meaning that at least a portion of the two pole pieces 125 are accommodated within the recess 129. That is, in some embodiments, both pole pieces 125 may be completely accommodated within the recess 129 and not protrude from it. In some embodiments, one of the two pole pieces 125 may be completely accommodated within the recess 129 and not protrude from it, while the other pole piece 125 may be partially accommodated within the recess 129 and protrude from it. In some embodiments, both pole pieces 125 are partially accommodated within the recess 129 and protrude from it.

[0057] By placing both poles 125 within the recesses 129, two issues are addressed: firstly, contact between the poles 125 and external structures (e.g., housing 110) is avoided, thus reducing the risk of leakage; secondly, the non-recessed portion of the housing assembly 126 can be directly connected and positioned to the external structure (e.g., housing 110). The recesses 129 in the housing assembly 126 accommodate the two poles 125 and fully utilize the internal space, thereby improving the volume utilization rate of the housing assembly 126. By ensuring that at least a portion of the orthographic projections of the two poles 125 onto the side of the housing assembly 126 along its thickness direction X overlap, the connectable section length of each pole 125 is maximized within the limited space of the recesses 129. This facilitates connection between the poles 125 and the circuit breakers, avoids the use of irregularly shaped circuit breakers for oblique connections, reduces the flow path length, and effectively improves space utilization.

[0058] Optionally, the groove shape of the groove 129 can be, but is not limited to, a circular groove, a rectangular groove, a spherical groove, etc., and the groove shape of the groove 129 can be customized according to actual needs.

[0059] In some possible embodiments, see Figure 3 and Figure 4 As shown, each pole post 125 includes an integrally connected base 1251 and an extension 1252; the extension 1252 extends along the length direction Y of the housing assembly 126; along the length direction Y of the housing assembly 126, the bases 1251 of the two pole posts 125 are arranged at intervals relative to each other; along the thickness direction X of the housing assembly 126, the extensions 1252 of the two pole posts 125 are arranged at intervals relative to each other.

[0060] The base 1251 of each pole post 125 is integrally connected with the extension 1252, and can be made of materials such as stainless steel, aluminum or copper.

[0061] Each pole post 125 has an L-shaped structure; two pole posts 125 are symmetrically arranged in the groove 129.

[0062] By setting the bases 1251 of the two pole posts 125 to be relatively spaced apart along the length Y direction of the housing assembly 126, and the extensions 1252 of the two pole posts 125 to be relatively spaced apart along the thickness X direction of the housing assembly 126, the two pole posts 125 can extend their own area as much as possible within the limited space of the groove 129, thereby facilitating connection with the bar plate, avoiding the use of irregularly shaped bar plates for oblique connection, and thus effectively improving space utilization.

[0063] Specifically, see Figure 3 as well as Figure 5As shown, in adjacent battery cells 121, the terminal 125 of one battery cell 121 serves as the positive terminal, and the terminal 125 of the other battery cell 121 serves as the negative terminal. The positive and negative terminals are connected by a connector 131. Since the extensions 1252 of the two terminals 125 in adjacent battery cells 121 extend along the length direction Y of the housing assembly 126 and are relatively spaced along the thickness direction X of the housing assembly 126, the two terminals 125 can maximize their area within the limited space of the groove 129. The positive terminal of the previous battery cell 121 and the negative terminal of the next battery cell 121 are on adjacent sides, and they can be connected by a conventional square connector, which results in a larger connection area, facilitates welding, and ultimately improves space utilization.

[0064] Optionally, in a single battery cell 121, the minimum distance between the two terminals 125 should be at least 1 mm. Typically, the distance between the two terminals 125 can be set to 2 mm, which can ensure the insulation strength of the battery cell 121.

[0065] In some possible embodiments, see Figure 3 and Figure 4 As shown, the groove depth of groove 129 is A, 0.5mm≤A≤10mm. The height of each pole post 125 is B, 1mm≤B≤10mm.

[0066] The two poles 125 are both disposed in the groove 129, which means that at least part of the two poles 125 are accommodated in the groove 129, thereby preventing the poles 125 from contacting the external structure and reducing the occurrence of leakage.

[0067] Specifically, the groove depth A of the groove 129 can be 1mm to 8mm, and can be further set to 1mm to 5mm; the height B of the pole post 125 can be 2mm-4mm, subject to the design.

[0068] In some possible embodiments, see Figures 3 to 6 As shown, the housing assembly 126 includes a housing 123 and an end cap 122; the end cap 122 covers the opening of the housing 123; the middle of the end cap 122 is recessed downward to form a groove 129.

[0069] The housing 123 has an opening at the top along the height direction Z of the housing assembly 126; the end cap 122 covers the opening of the housing 123, and the middle part of the end cap 122 is recessed downward to form a groove 129, at least a portion of the two pole posts 125 are accommodated in the groove 129, thereby preventing the pole posts 125 from contacting the external structure and thus reducing the occurrence of leakage current.

[0070] The non-recessed portion of the end cap 122 can be directly connected and positioned to an external structure (such as the housing 110), thereby directly pressing part of the housing 110 against the end cap 122 to prevent the battery cell 121 from jumping in the battery pack, simplifying the structure and effectively improving space utilization.

[0071] Those skilled in the art will know that the battery cell 121 should also include electrode components (not shown) and other functional components necessary to perform its function.

[0072] See Figures 3 to 6 As shown, end cap 122 refers to a component that covers the opening of housing 123 to isolate the internal environment of the electrode assembly from the external environment. The shape of end cap 122 can be adapted to the shape of housing 123 to fit it. Optionally, end cap 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 122 is less prone to deformation under pressure and impact, allowing the battery cell 121 to have higher structural strength and improved safety performance. Functional components such as terminals 125 are provided on end cap 122. Terminals 125 can be used for electrical connection with the electrode assembly to output or input electrical energy to the battery cell 121. The material of end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 122. The insulating element can be used to isolate the electrical connection components within the housing 123 from the end cap 122 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0073] The housing 123 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 121. This internal environment can accommodate electrode components, electrolyte, and other components. The housing 123 and the end cap 122 can be independent components. An opening can be provided on the housing 123, and the end cap 122 can be used to close the opening to form the internal environment of the battery cell 121. Alternatively, the end cap 122 and the housing 123 can be integrated. Specifically, the end cap 122 and the housing 123 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 123, the end cap 122 closes the housing 123. The housing 123 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 123 can be determined according to the specific shape and size of the electrode components. The material of the housing 123 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.

[0074] The electrode assembly is the component in the battery cell 121 where the electrochemical reaction occurs. The casing 123 may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab (not shown). 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 terminals 125 to form a current loop.

[0075] In some possible embodiments, see Figures 3 to 6 As shown, the groove 129 extends through the end cap 122 along the thickness direction X of the housing assembly 126. Thus, when the battery cells 121 are integrated into the battery module 120 or directly form a battery pack, multiple battery cells 121 are arranged in an array along the thickness direction X, and the grooves 129 of each battery cell 121 are connected to form a channel, which is beneficial for the integration and connection between the battery cells 121.

[0076] In some possible embodiments, see Figure 4 As shown, the cross-sectional shape of the groove 129 perpendicular to the thickness direction X of the housing assembly 126 is rectangular. Compared with other shapes, the rectangular cross-section of the groove 20 does not produce excessive curves and convergence at the edges, allowing for more efficient use of the space within the housing assembly 126 and effectively improving space utilization. Furthermore, compared to complex non-rectangular shapes, the rectangular groove 129 is easier to process and manufacture, has lower manufacturing costs, and can be produced using common equipment. The rectangular groove 20 also provides more space, facilitating the installation of the pole post 125.

[0077] In some possible embodiments, see Figures 3 to 6 As shown, the battery cell includes a pressure relief mechanism 130; the pressure relief mechanism 130 is disposed on the side 1231 of the housing 123 along the length Y direction of the housing assembly 126.

[0078] The pressure relief mechanism 130 can be an explosion-proof valve. When the internal pressure or temperature of the battery cell 121 reaches a threshold, the pressure relief mechanism 130 can release the internal pressure in a timely manner, thereby ensuring battery safety.

[0079] It is understood that the housing 123 includes a bottom surface (not shown) along the height direction Z and an opening at the other end, with the end cap 122 covering the opening of the housing 123. The two sides of the housing 123 along the thickness direction X of the housing assembly 126 are the largest surfaces 1232, and the side surface 1231 connects the two opposite large surfaces 1232. The side surface 1231 has the smallest area among all surfaces of the housing 123. With the pressure relief mechanism 130 needing to occupy a constant height, placing the pressure relief mechanism 130 on the side surface 1231 of the housing 123 along the length direction Y of the housing assembly 126 can minimize the exhaust volume occupied by the pressure relief mechanism 130, thereby effectively improving space utilization.

[0080] In some possible embodiments, see Figures 3 to 6 As shown, along the thickness direction X of the housing assembly 126, the thickness of the housing 123 is C, where 8 mm ≤ C ≤ 100 mm. Along the length direction Y of the housing assembly 126, the length of the housing 123 is D, where 120 mm ≤ D ≤ 500 mm; along the height direction Z of the housing assembly 126, the height of the housing 123 is E, where 50 mm ≤ E ≤ 300 mm. The height direction Z, length direction Y, and thickness direction X of the housing assembly 126 are perpendicular to each other.

[0081] In this embodiment, the dimension D of the battery cell 121 in the length direction Y is made as long as possible, typically 150mm≤D≤400mm. The dimension C of the battery cell 121 in the thickness direction X is made as short as possible, and the dimension E of the battery cell 121 in the height direction Z is made as short as possible, typically 10mm≤C≤90mm and 80mm≤E≤250mm. Thus, with the same volume, the area occupied by the end cap 122 can be maximized, making the side surface 1231 the smallest among all surfaces of the housing 123. While the pressure relief mechanism 130 needs to occupy a constant height, placing the pressure relief mechanism 130 on the side surface 1231 of the housing 123 along the length direction Y of the housing assembly 126 minimizes the exhaust volume occupied by the pressure relief mechanism 130, thereby effectively improving space utilization.

[0082] A second aspect of this application provides a battery device 100, including the aforementioned battery cell 121; the battery cell 121 is arranged along the thickness direction X of the housing assembly 126.

[0083] A third aspect of this application provides a battery device 100, see reference. Figure 6As shown, the battery device 100 includes two sets of battery modules 120. Each set of battery modules 120 is formed by arranging multiple battery cells 121 along the thickness direction X of the housing assembly 126. Each battery cell 121 includes a pressure relief mechanism 130, which is disposed on a side 1231 of the housing 123 in the housing assembly 126. The side 1231 is located along the length direction of the housing 123 in the housing assembly 126. The multiple side 1231 with pressure relief mechanisms 130 together constitute a pressure relief surface 128. The pressure relief surfaces 128 of the two sets of battery modules 120 are arranged at intervals. In this way, the exhaust areas required by the two sets of battery modules 120 can be combined, thereby effectively improving the space utilization rate in the battery device 100.

[0084] A fourth aspect of this application provides an electrical device 1000, including the battery device 100 described above. The battery device 100 is used to provide electrical energy.

[0085] 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.

[0086] 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: The housing assembly (126) has a groove (129) formed by recessing the top end of the housing assembly (126) downward along its height direction (Z). And two pole posts (125) arranged at relative intervals are both disposed in the groove (129); The two pole posts (125) overlap at least a portion of the orthographic projection of the housing assembly (126) along its thickness direction (X).

2. The battery cell according to claim 1, characterized in that, Each of the pole posts (125) includes an integrally connected base (1251) and an extension (1252); the extension (1252) extends along the length direction (Y) of the housing assembly (126); Along the length direction (Y) of the housing assembly (126), the bases (1251) of the two pole posts (125) are arranged at relative intervals; Along the thickness direction (X) of the housing assembly (126), the extensions (1252) of the two pole posts (125) are arranged at relative intervals.

3. The battery cell according to claim 1 or 2, characterized in that, Each of the pole posts (125) has an L-shaped structure; the two pole posts (125) are symmetrically arranged in the groove (129).

4. The battery cell according to claim 1 or 2, characterized in that, The groove (129) has a groove depth of A, where 0.5mm ≤ A ≤ 10mm; The height of each pole (125) is B, where 1mm ≤ B ≤ 10mm.

5. The battery cell according to claim 1 or 2, characterized in that, The housing assembly (126) includes a housing (123) and an end cap (122); The end cap (122) covers the opening of the housing (123); the middle of the end cap (122) is recessed downward to form the groove (129).

6. The battery cell according to claim 5, characterized in that, The groove (129) extends through the end cap (122) along the thickness direction (X) of the housing assembly (126).

7. The battery cell according to claim 5, characterized in that, Along the thickness direction (X) of the housing assembly (126), the thickness of the housing (123) is C, where 8mm ≤ C ≤ 100mm; Along the length direction (Y) of the housing assembly (126), the length of the housing (123) is D, 120mm≤D≤500mm; Along the height direction (Z) of the housing assembly (126), the height of the housing (123) is E, 50mm≤E≤300mm; The height (Z), length (Y), and thickness (X) directions of the housing assembly (126) are perpendicular to each other.

8. The battery cell according to claim 5, characterized in that, The battery cell includes a pressure relief mechanism (130); the pressure relief mechanism (130) is disposed on the side (1231) of the housing (123) along the length direction (Y) of the housing assembly (126).

9. A battery device, characterized in that, Includes a battery cell as described in any one of claims 1 to 8; the battery cells are arranged along the thickness direction (X) of the housing assembly (126).

10. A battery device, characterized in that, The assembly includes two sets of battery modules (120), each set of battery modules (120) being formed by arranging a plurality of battery cells as described in any one of claims 1 to 7 along the thickness direction (X) of the housing assembly (126), each battery cell including a pressure relief mechanism (130), the pressure relief mechanism (130) being disposed on the side (1231) of the housing (123) in the housing assembly (126), the side (1231) being located on the housing (123) along the length direction of the housing assembly (126); The multiple sides (1231) of the pressure relief mechanism (130) together constitute a pressure relief surface (128); and the pressure relief surfaces (128) of the two sets of battery modules (120) are arranged at relative intervals.

11. An electrical appliance, characterized in that, Includes the battery device as described in claim 9 or 10.

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