Battery cell, battery device, energy storage device, energy storage system and charging grid

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery monomer, a battery device, an energy storage device, an energy storage system and a charging grid. Wherein the battery monomer comprises a shell, an electrode assembly, an electrode terminal and an adapter plate, the shell comprises a shell main body and a shell cover, the shell main body and the shell cover are mutually covered to form an accommodating space, the electrode assembly is accommodated in the accommodating space, the electrode assembly comprises a main body part and a tab, the electrode terminal is arranged on the shell cover in a penetrating manner, and the adapter plate and the electrode terminal are electrically connected through the adapter plate. The shell cover is provided with a positioning structure, a limiting space is defined by the positioning structure, at least part of the switching piece is arranged in the limiting space, the positioning structure abuts against the switching piece, the positioning structure is configured to limit the switching piece to move, and in the first direction, the projection of the electrode terminal is located in the area range of the projection of the limiting space. According to the technical scheme, the problem that the assembling efficiency is affected due to the fact that the relative position between the switching piece and the electrode terminal is prone to relative deviation is solved.

Description

Technical Field

[0001] This application belongs to the field of battery equipment technology, and in particular relates to a battery cell, battery device, energy storage device, energy storage system and charging grid. Background Technology

[0002] A single battery cell includes components such as a casing body, a casing cover, electrode assemblies, electrode terminals, and adapter plates. The casing body and casing cover fit together to house the electrode assemblies. The electrode terminals are located on the casing cover to form modular components. The electrode terminals and the tabs of the electrode assemblies are electrically connected via adapter plates. In related technologies, when electrically connecting the adapter plates to the electrode terminals, the relative positions of the adapter plates and electrode terminals are prone to misalignment, which affects assembly efficiency. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system, and charging grid, which aims to solve the problem that the relative position between the adapter and the electrode terminal is prone to offset, thus affecting the assembly efficiency.

[0004] To achieve the above objectives, according to a first aspect of the embodiments of this application, a battery cell is provided, including a housing, an electrode assembly, electrode terminals, and an adapter piece. The housing includes a housing body and a housing cover, which are fitted together along a first direction to form a receiving space. The electrode assembly is housed within the receiving space and includes a main body portion and a tab electrically connected to the main body portion, with the tab facing the housing cover. The electrode terminals are disposed through the housing cover. The adapter piece is housed within the receiving space, and the electrode terminals and tabs are electrically connected via the adapter piece. A positioning structure is provided on the inner side of the housing cover facing the receiving space, enclosing a restricted space. At least a portion of the adapter piece is disposed within the restricted space, and the positioning structure abuts against and is positioned at the circumferential edge of the adapter piece. The positioning structure is configured to restrict displacement of the adapter piece, and along the first direction, the projection of the electrode terminals is located within the area of ​​the projection of the restricted space.

[0005] The shell cover of the battery cell provided by the embodiments of the present application is provided with a positioning structure on the inner side of the accommodation space formed by the mutual covering of the shell main body and the shell cover. When the adapter piece is electrically connected with the electrode terminal on the shell cover, the positioning structure is positioned and connected with the adapter piece (i.e., the positioning structure is configured to limit the displacement of the adapter piece), so that the positioning structure can limit the relative position between the adapter piece and the electrode terminal, so that the adapter piece and the electrode terminal remain stable in relative position. In this way, when the adapter piece is placed on the shell cover and aligned with the electrode terminal, the positioning structure synchronously positions and limits the adapter piece, and the adapter piece and the electrode terminal always remain stable in relative position during the electrical connection of the adapter piece and the electrode terminal, which is beneficial to improve the connection efficiency, thereby improving the overall assembly production efficiency of the battery cell, improving the production capacity, and reducing the assembly production cost. Moreover, the projection of the electrode terminal along the first direction is located within the range of the projection of the limiting space along the first direction, so that the laser welding position between the adapter piece and the electrode terminal in different battery cells is basically consistent, which is beneficial to improve the welding consistency between the adapter piece and the electrode terminal, thereby improving the overall reliability of the battery cell.

[0006] In some embodiments, the positioning structure comprises a protruding portion, and the protruding portion surrounds the limiting space.

[0007] In some embodiments, along the first direction, the height of the end surface of the protruding portion beyond the electrode terminal is H1, the thickness of the adapter piece is H2, and 0≤H2-H1≤3mm. In this way, the protruding portion does not interfere with the spatial motion trajectory of the laser welding equipment, and the laser welding equipment has more sufficient operation space when welding, thereby improving the operation flexibility of the laser welding equipment and being beneficial to improve the connection efficiency.

[0008] In some embodiments, the number of protruding portions is at least 4, the at least 4 protruding portions are arranged in a circumferential interval, and the at least 4 protruding portions are arranged on opposite sides of the adapter piece. In this way, the adapter piece is limited and positioned, so that the adapter piece and the electrode terminal remain stable in relative position.

[0009] In some embodiments, the number of protruding portions is at least 4, the at least 4 protruding portions are arranged in a circumferential interval, and the projection of the adapter piece along the first direction has a rectangular contour shape, and each side edge of the adapter piece abuts against at least one protruding portion. Each side edge of the rectangular adapter piece is positioned by the abutment of the protruding portion, so that the adapter piece remains stable in relative position and improves the welding reliability of the adapter piece and the electrode terminal.

[0010] In some embodiments, the cross-sectional profile of the protruding portion perpendicular to the first direction is one of a square, a circle, a semicircle, and a regular polygon.

[0011] In some embodiments, the positioning structure comprises a closed loop or a continuous protruding portion that is not closed. The continuous protruding portion surrounds the limiting space.

[0012] In some embodiments, the shell cover comprises a cover body and a first insulation layer, the first insulation layer is arranged on a side of the cover body facing the accommodation space, the positioning structure is integrally formed with the first insulation layer, and the electrode terminal is insulated from the cover body. The positioning structure can ensure insulation while positioning the adapter piece, and insulation is ensured between the adapter piece and the cover body after the adapter piece and the electrode terminal are electrically connected.

[0013] In some embodiments, the battery monomer further comprises a second insulation layer, the second insulation layer is arranged between the first insulation layer and the adapter piece, the second insulation layer surrounds the electrode terminal, and the melting point of the second insulation layer is greater than the melting point of the first insulation layer. The second insulation layer insulates the first insulation layer, reducing the risk of the first insulation layer being melted by high temperature during welding.

[0014] In some embodiments, in the first direction, the projection of the tab is located within the outer circle contour of the projection of the second insulation layer, thereby better protecting the first insulation layer during welding and reducing the risk of the first insulation layer being melted by high temperature during welding.

[0015] According to a second aspect of the embodiments of the present application, a battery device is provided. The battery device comprises the battery monomer as described above, and the battery monomer is used to store or provide electric energy.

[0016] According to a third aspect of the embodiments of the present application, an energy storage device is provided. The energy storage device comprises the battery monomer as described above, and the battery monomer is used to store or provide electric energy. Alternatively, the energy storage device comprises the battery device as described above, and the battery monomer in the battery device is used to store or provide electric energy.

[0017] According to a fourth aspect of the embodiments of the present application, an energy storage system is provided. The energy storage system comprises a power conversion device and the energy storage device as described above, and the power conversion device is electrically connected between a power generation device and the energy storage device.

[0018] According to a fifth aspect of the embodiments of the present application, a charging grid is provided. The charging grid comprises a charging pile and the energy storage device as described above, and the charging pile is electrically connected with the energy storage device. Alternatively, the charging grid comprises a charging pile and the energy storage system as described above, and the charging pile is electrically connected with the energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 A structural schematic view of a battery cell according to an embodiment of the present application;

[0021] Figure 2 A structural schematic view of a battery cell according to an embodiment of the present application; Figure 1 A structural schematic view of a battery cell according to an embodiment of the present application;

[0022] Figure 3 A structural schematic view of a battery cell according to an embodiment of the present application;

[0023] Figure 4 A structural schematic view of a battery cell according to an embodiment of the present application; Figure 3 A sectional view along the direction of A-A in FIG. 5;

[0024] Figure 5 A structural schematic view of a battery cell according to an embodiment of the present application; Figure 4 An enlarged view of D in FIG. 6;

[0025] Figure 6 A structural schematic view of a battery cell according to an embodiment of the present application;

[0026] Figure 7 A structural schematic view of a battery cell according to an embodiment of the present application; Figure 6 A sectional view along the direction of C-C in FIG. 7;

[0027] Figure 8 A structural schematic view of a battery cell according to an embodiment of the present application; Figure 7 An enlarged view of D in FIG. 8;

[0028] Figure 9 A structural schematic view of a battery cell according to an embodiment of the present application;

[0029] Figure 10 A structural schematic view of a battery device according to an embodiment of the present application;

[0030] Figure 11 A structural schematic view of an energy storage device according to an embodiment of the present application.

[0031] In the drawings, reference numerals are generally used to refer to the same or similar elements throughout.

[0032] 100, battery cell;

[0033] 10, housing; 11, housing main body; 12, housing cover; 121, cover body; 122, first insulating layer; 13, accommodation space;

[0034] 20, electrode assembly; 21, main body portion; 22, tab;

[0035] 30, electrode terminal; 31, pressure relief mechanism;

[0036] 40, adapter piece;

[0037] 50, positioning structure; 51, limiting space; 52, protrusion;

[0038] 60, second insulating layer;

[0039] 200, battery device; 201, case main body; 202, case cover; 203, assembly space;

[0040] 300, energy storage device; 301, cabinet body;

[0041] Z, first direction; X, second direction; Y, third direction. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0043] In the description of the present application, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station (the battery device of such application is generally called energy storage battery), but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles (the battery device of such application is generally called power battery). With the continuous expansion of the application field of battery device, the market demand is also increasing. Therefore, the expansion of market demand also requires continuous improvement of production capacity, and improving production efficiency is one of the quantitative indicators of improving production capacity.

[0047] In the related art, the battery monomer includes shell body, shell cover, electrode assembly, electrode terminal and adapter piece and other components, wherein the electrode terminal is provided on the shell cover to form a module component, the shell body and the shell cover are mutually covered to form an internal space for accommodating the electrode assembly, then the electrode assembly is assembled into the internal space, the sealing assembly is completed between the shell body and the shell cover, finally the electrolyte is injected from the liquid injection hole on the shell cover and the liquid injection hole is sealed, that is, the assembly and forming process of the battery monomer is completed. When the battery monomer is assembled and formed, the adapter piece and the electrode terminal are first electrically connected, then the lug of the electrode assembly and the adapter piece are electrically connected, then the electrode assembly is installed into the shell body, and then the shell cover and the shell body are mutually covered and sealed.

[0048] However, when the adapter piece is electrically connected to the electrode terminal, the relative position between the adapter piece and the electrode terminal is easy to shift, causing the connection position between the adapter piece and the electrode terminal to be misaligned. In order to keep the relative position between the adapter piece and the electrode terminal stable, that is, the connection position between the adapter piece and the electrode terminal stable. Generally, the adapter piece will be positioned and limited by the positioning jig during the connection process, which increases the positioning process of the adapter piece during the connection process, resulting in the connection time between the adapter piece and the electrode terminal being prolonged, and the positioning jig occupies the operation space, to some extent, interferes with the space motion trajectory of the connection equipment used for connecting the adapter piece and the electrode terminal, limits the motion freedom and operation flexibility of the space motion of the connection equipment. This affects the assembly and production efficiency of the battery monomer.

[0049] Based on the above considerations, the embodiments of the present application provide a battery monomer, the shell cover of which is provided with a positioning structure towards the inner side of the accommodation space formed by the mutual covering of the shell main body and the shell cover. When the adapter piece is electrically connected with the electrode terminal on the shell cover, the positioning structure is positioned and connected with the adapter piece, so that the positioning structure can limit the relative position between the adapter piece and the electrode terminal, so that the adapter piece and the electrode terminal maintain stable relative position. In this way, even without the jig for positioning the adapter piece, the positioning restriction of the adapter piece can be realized through the positioning structure. When the adapter piece is placed on the shell cover and aligned with the electrode terminal, the positioning structure synchronously positions and restricts the adapter piece, and the relative position between the adapter piece and the electrode terminal is always stable during the electrical connection between the adapter piece and the electrode terminal, which is beneficial to improve the connection efficiency. Moreover, the way of positioning and restricting the adapter piece by the positioning structure makes the connection equipment for connecting the adapter piece and the electrode terminal have more sufficient operation space, improves the operation flexibility of the connection equipment, and thus is beneficial to improve the connection efficiency. In this way, it is beneficial to improve the overall assembly production efficiency of assembling the battery monomer, improve the production capacity, and reduce the assembly production cost.

[0050] In order to illustrate the technical solutions provided by the embodiments of the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0051] As shown in Figures 1 to 3 , Figure 6 and Figure 8 , the positive and negative directions represented by the Z arrow are the first direction Z, the positive and negative directions represented by the X arrow are the second direction X, and the positive and negative directions represented by the Y arrow are the third direction Y.

[0052] According to a first aspect of the embodiments of the present application, the embodiments of the present application provide a battery monomer 100. As shown in Figures 1 to 8 , the battery monomer 100 includes a shell 10, an electrode assembly 20, an electrode terminal 30, and an adapter piece 40, the shell 10 includes a shell main body 11 and a shell cover 12, the shell main body 11 and the shell cover 12 are mutually covered along the first direction Z to form an accommodation space 13, the electrode assembly 20 is accommodated in the accommodation space 13, the electrode assembly 20 includes a main body part 21 and a tab 22 electrically connected to the main body part 21, the tab 22 is towards the shell cover 12, the electrode terminal 30 is provided on the shell cover 12, the adapter piece 40 is accommodated in the accommodation space 13, and the electrode terminal 30 and the tab 22 are electrically connected through the adapter piece 40. Wherein, the shell cover 12 is provided with a positioning structure 50 towards the inner side of the accommodation space 13, the positioning structure 50 is positioned and connected with the adapter piece 40 to limit the relative position between the adapter piece 40 and the electrode terminal 30, that is, the positioning structure 50 is configured to limit the displacement of the adapter piece 40.

[0053] The shell cover 12 of the battery cell 100 provided by the embodiments of the present application is provided with a positioning structure 50 facing the inner side of the accommodating space 13 formed by the mutual covering of the shell main body 11 and the shell cover 12. When the adapter piece 40 is electrically connected with the electrode terminal 30 on the shell cover 12, the positioning structure 50 is positioned and connected with the adapter piece 40, that is, the positioning structure 50 is configured to limit the displacement of the adapter piece 40, so that the positioning structure 50 can limit the relative position between the adapter piece 40 and the electrode terminal 30, so that the adapter piece 40 and the electrode terminal 30 maintain stable relative position. In this way, even without the jig to position the adapter piece 40, the positioning structure 50 can also achieve positioning limitation on the adapter piece 40. When the adapter piece 40 is placed on the shell cover 12 and aligned with the electrode terminal 30, the positioning structure 50 synchronously positions and limits the adapter piece 40. During the process of electrically connecting the adapter piece 40 and the electrode terminal 30, the relative position between the adapter piece 40 and the electrode terminal 30 is always stable, which is beneficial to improve the connection efficiency. Moreover, the way that the positioning structure 50 positions and limits the adapter piece 40 makes the connecting equipment for connecting the adapter piece 40 and the electrode terminal 30 have more sufficient operation space, which improves the operation flexibility of the connecting equipment, thereby being beneficial to improve the connection efficiency. In this way, it is beneficial to improve the overall assembly production efficiency of the battery cell 100, improve the production capacity, and reduce the assembly production cost. Moreover, during the process of welding the adapter piece 40 and the electrode terminal 30, the relative position between the adapter piece 40 and the electrode terminal 30 is always stable, which is beneficial to improve the connection consistency between the adapter piece 40 and the electrode terminal 30 of different battery cells 100, thereby improving the connection reliability between the adapter piece 40 and the electrode terminal 30, and being beneficial to improve the overall reliability of the battery cell 100.

[0054] The battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging. The battery cell 100 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard. In addition, the battery cell 100 provided by the embodiments of the present application is a square battery cell, also known as a square cell. The housing 10 of the square battery cell 100 has two large side walls with large surface areas facing away from each other along the second direction X, two small side walls with small surface areas facing away from each other along the third direction Y, and a bottom end wall and a top end wall (the top end wall is the shell cover 12, and the bottom end wall is the bottom side wall of the shell main body 11 opposite to the shell cover 12) facing away from each other along the first direction Z. The two large side walls and the two small side walls are alternately connected to form a prismatic side wall, and the bottom end wall and the top end wall are located at the upper and lower ends of the prismatic side wall, respectively. Generally, the top end wall is provided with a pressure relief mechanism 31 and an electrode terminal 30, etc., so that the top end wall (i.e., the shell cover 12) can be easily determined, and the wall opposite to the top end wall is the bottom end wall. For the two large side walls and the two small side walls, the size of the surface area of the side wall can be directly used to distinguish them.

[0055] During the assembly of the battery cell 100, the adapter piece 40 and the electrode terminal 30 are laser welded by a laser welding device, so that the adapter piece 40 and the electrode terminal 30 are electrically connected.

[0056] The square battery cell 100 is equipped with two electrode assemblies 20, that is, two electrode assemblies 20 are electrically connected to the electrode terminal 30 in parallel, and the two electrode assemblies 20 are installed side by side in the receiving space 13. The main body part 21 of the two electrode assemblies 20 is placed symmetrically relative to the adapter tab 40, and the two electrode assemblies 20 are both lapped on the adapter tab 40, and the ultrasonic welding device is used to ultrasonic weld the tab 22 and the adapter tab 40, so that the tab 22 and the adapter tab 40 are electrically connected. After the tab 22 and the adapter tab 40 are ultrasonic welded, the main body part 21 of the two electrode assemblies 20 is turned towards each other until the main body part 21 of the two electrode assemblies 20 are placed side by side. The adapter tab 40 used by the square battery cell 100 is in the form of a sheet, and after the adapter tab 40 is welded on the electrode terminal 30, the adapter tab 40 does not need to be deformed by bending, but the tab 22 is bent to deform the two main body parts 21 to approach each other until they are placed side by side. Then, the main body part 21 of the two electrode assemblies 20 placed side by side is inserted into the receiving space 13 along the first direction Z, and the shell cover 12 covers the open end of the shell main body 11, and the circumferential gap between the shell main body 11 and the shell cover 12 is sealed. Finally, the electrolyte is injected from the liquid injection hole on the shell cover 12 to immerse the main body part 21 of the electrode assembly 20 and seal the liquid injection hole, that is, the assembly and generation process of the battery cell 100 is completed.

[0057] Of course, the battery cell 100 can also be cylindrical, also known as cylindrical cell. The main body part 21 of the electrode assembly 20 of the cylindrical battery cell 100 is a single cylinder formed by winding. The structure of the adapter tab 40 used by the cylindrical battery cell 100 is generally a foldable structure or a three-fold structure (also known as Z-shaped structure), that is: when the cylindrical battery cell 100 uses the adapter tab 40 with a foldable structure, the process of laser welding the adapter tab 40 with the electrode terminal 30 and the process of ultrasonic welding the adapter tab 40 with the tab 22 are the same as the welding process of the square battery cell 100 described above, and then when the main body part 21 is turned relative to the shell cover 12 to be on the same central axis as the shell cover 12, the adapter tab 40 is folded and deformed; when the cylindrical battery cell 100 uses the adapter tab 40 with a three-fold structure, the process of laser welding the adapter tab 40 with the electrode terminal 30 and the process of ultrasonic welding the adapter tab 40 with the tab 22 are also the same as the welding process of the square battery cell 100 described above, and then when the main body part 21 is turned relative to the shell cover 12 to be on the same central axis as the shell cover 12, the adapter tab 40 has two bending deformation positions to form a Z-shaped structure.

[0058] As Figure 5 and Figure 8As shown, the positioning structure 50 surrounds the limiting space 51, at least part of the adapter piece 40 is arranged in the limiting space 51, and the positioning structure 50 abuts the circumferential edge of the adapter piece 40. In this way, the positioning structure 50 limits the positioning of the circumferential edge of the adapter piece 40, so as to limit the relative position between the adapter piece 40 and the electrode terminal 30, and keep the relative position between the adapter piece 40 and the electrode terminal 30 stable.

[0059] In some embodiments, as shown in Figure 5 and Figure 8 shown, along the first direction Z, the projection of the electrode terminal 30 is located within the range of the projection of the limiting space 51. That is, when the adapter piece 40 is placed on the shell cover 12 and aligned with the electrode terminal 30, the adapter piece 40 located in the limiting space 51 covers the electrode terminal 30 along the first direction Z, that is, the adapter piece 40 and the electrode terminal 30 are aligned with each other. Since the relative position between the adapter piece 40 and the electrode terminal 30 is limited by the positioning structure 50, the alignment between the adapter piece 40 and the electrode terminal 30 is stable, so that the laser welding position between the adapter piece 40 and the electrode terminal 30 in different battery monomers 100 is basically consistent, which is beneficial to improve the welding consistency between the adapter piece 40 and the electrode terminal 30, thereby improving the overall reliability of the battery monomer 100.

[0060] In other embodiments, along the first direction Z, the projection of the electrode terminal 30 and the projection of the limiting space 51 can be at least partially misaligned. Among them, "the projection of the electrode terminal 30 and the projection of the limiting space 51 are at least partially misaligned" can be that the projection of the electrode terminal 30 along the first direction Z and the projection of the limiting space 51 along the first direction Z are completely misaligned, and there is no overlapping part between them; or "the projection of the electrode terminal 30 and the projection of the limiting space 51 are at least partially misaligned" can be that the projection of the electrode terminal 30 along the first direction Z and the projection of the limiting space 51 along the first direction Z only have a part of overlap, and the other part does not overlap. Therefore, in this embodiment, part of the adapter piece 40 extends out of the limiting space 51, so that the adapter piece 40 which is stably positioned by the positioning structure 50 can always cover at least part of the electrode terminal 30, and then laser welding is performed to improve the welding consistency between the adapter piece 40 and the electrode terminal 30.

[0061] As shown in Figures 3 to 8 in some embodiments, the positioning structure 50 includes a protruding portion 52, and the protruding portion 52 surrounds the limiting space 51. On the basis of the mold used to prepare the original shell cover, only by adding a cavity for forming the protruding portion 52 on the original mold through the method of removing mold material, a new shell cover 12 can be formed. In this way, the existing production mold is reasonably and efficiently utilized, and there is no need to prepare a new mold, which saves the cost of mold opening and is beneficial to reduce the overall production cost of the battery monomer 100.

[0062] As shown in Figure 5 and Figure 8 , in some embodiments, the height of the end surface of the protruding portion 52 beyond the electrode terminal 30 along the first direction Z is H1, the thickness of the adapter tab 40 is H2, and 0≤H2-H1≤3mm. That is, when the adapter tab 40 is placed on the shell cover 12 and positioned by the protruding portion 52, the adapter tab 40 protrudes away from the surface of the shell cover 12 along the first direction Z beyond the protruding portion 52. In this way, the protruding portion 52 does not interfere with the spatial movement trajectory of the laser welding device, the laser welding device has more sufficient operating space when welding, and the operating flexibility of the laser welding device is improved, thereby facilitating the improvement of the connection efficiency. Preferably, the difference (H2-H1) is in the range of 0≤H2-H1≤2mm.

[0063] In some embodiments, as shown in Figure 3 and Figure 6 , the number of protruding portions 52 is at least 4, and the at least 4 protruding portions 52 are arranged circumferentially at intervals. In this way, the adapter tab 40 is positioned so that the relative position between the adapter tab 40 and the electrode terminal 30 is stable.

[0064] As an example, as shown in Figure 3 , the number of protruding portions 52 is 4, and the 4 protruding portions 52 are arranged on opposite sides of the adapter tab 40, that is, each side is positioned by 2 protruding portions 52, that is, the side of the adapter tab 40 is positioned by 2 spaced protruding portions 52, thereby preventing the adapter tab 40 from rotating around the protruding portion 52. In this way, by positioning the opposite sides of the adapter tab 40 by the 4 protruding portions 52, the relative position of the adapter tab 40 can be kept stable, thereby reducing the possibility of relative position deviation of the adapter tab 40 when the laser welding device welds the adapter tab 40 and the electrode terminal 30, and improving the welding reliability of the adapter tab 40 and the electrode terminal 30.

[0065] As an example, as shown in Figure 6 , the number of protruding portions 52 is 6, the 6 protruding portions 52 are arranged circumferentially at intervals, and the projection of the adapter tab 40 along the first direction Z has a rectangular contour shape, and each side of the adapter tab 40 abuts at least one protruding portion 52. That is, each side of the rectangular adapter tab 40 is positioned by the protruding portion 52, so that the relative position of the adapter tab 40 is stable, thereby reducing the possibility of relative position deviation of the adapter tab 40 when the laser welding device welds the adapter tab 40 and the electrode terminal 30, and improving the welding reliability of the adapter tab 40 and the electrode terminal 30.

[0066] In some embodiments, the cross-sectional profile of the protrusion 52 perpendicular to the first direction Z is one of square, circular, semi-circular, regular polygon. As shown in Figure 3 and Figure 6 As shown in the drawings, the embodiments of the present application preferentially adopt the protrusion 52 with square cross-sectional profile perpendicular to the first direction Z, so that the protrusion 52 and the side edge of the adapter tab 40 are at least in line contact (when the side edge of the adapter tab 40 is sharp edge caused by cutting process, the protrusion 52 and the side edge of the adapter tab 40 are in line contact; when the side edge of the adapter tab 40 is flat side surface, the protrusion 52 and the side edge of the adapter tab 40 are in surface contact), which is beneficial to improve the stability of the adapter tab 40 being positioned by abutting.

[0067] In some embodiments, the positioning structure 50 includes continuous protrusions 52 in closed loop, and the continuous protrusions 52 in closed loop surround the limiting space 51. In the present embodiment, the projection of the limiting space 51 along the first direction Z covers the projection of the electrode terminal 30 along the first direction Z.

[0068] In other embodiments, the positioning structure 50 includes continuous protrusions 52 in non-closed loop, and the continuous protrusions 52 in non-closed loop surround the limiting space 51, i.e. the limiting space 51 has a gap. In which, the projection of the limiting space 51 with gap along the first direction Z can cover the projection of the electrode terminal 30 along the first direction Z. Or, the projection of the limiting space 51 with gap along the first direction Z is partially overlapped with the projection of the electrode terminal 30 along the first direction Z, in order to make the adapter tab 40 cover the electrode terminal 30, a part of the adapter tab 40 extends from the gap and covers the part of the electrode terminal 30 outside the limiting space 51.

[0069] In other embodiments, the positioning structure 50 can be a groove provided on the shell cover 12, and the through hole on the shell cover 12 for penetrating the electrode terminal 30 is provided on the groove bottom. In the present embodiment, the electrode terminal 30 is penetrated into the groove, and then the adapter tab 40 is placed into the groove to contact the electrode terminal 30. Thus, the circumferential groove wall of the groove plays a positioning limiting role on the circumferential side edge of the adapter tab 40, and the adapter tab 40 is higher than the groove to facilitate the laser welding equipment to weld the adapter tab 40 and the electrode terminal 30, and improve the welding efficiency.

[0070] As shown in the drawings, the embodiments of the present application preferentially adopt the protrusion 52 with square cross-sectional profile perpendicular to the first direction Z, so that the protrusion 52 and the side edge of the adapter tab 40 are at least in line contact (when the side edge of the adapter tab 40 is sharp edge caused by cutting process, the protrusion 52 and the side edge of the adapter tab 40 are in line contact; when the side edge of the adapter tab 40 is flat side surface, the protrusion 52 and the side edge of the adapter tab 40 are in surface contact), which is beneficial to improve the stability of the adapter tab 40 being positioned by abutting. Figures 2 to 8As shown, in some embodiments, the shell cover 12 comprises a cover body 121 and a first insulating layer 122 arranged on the side of the cover body 121 facing the accommodation space 13, wherein the shell body 11 and the cover body 121 are preferably made of aluminum metal material, and the inner wall of the shell body 11 is provided with an insulating layer. When the shell body 11 and the shell cover 12 are covered with each other, the circumferential edge of the first insulating layer 122 abuts the circumferential opening of the insulating layer arranged on the inner wall of the shell body 11 and forms a sealed arrangement, and the circumferential edge of the cover body 121 and the circumferential opening of the shell body 11 are laser welded to further seal the accommodation space 13 of the shell 10. In this embodiment, the positioning structure 50 is integrally formed with the first insulating layer 122, and the electrode terminal 30 is insulated from the cover body 121. In this way, the positioning structure 50 can ensure insulation while positioning the adapter piece 40, and insulation is ensured between the adapter piece 40 and the cover body 121 after the adapter piece 40 and the electrode terminal 30 are electrically connected.

[0071] In some embodiments, as Figure 9 As shown, on the basis of the first insulating layer 122 arranged on the shell cover 12, the battery monomer 100 further comprises a second insulating layer 60 arranged between the first insulating layer 122 and the adapter piece 40, the second insulating layer 60 surrounds the electrode terminal 30, and the melting point of the second insulating layer 60 is higher than that of the first insulating layer 122. When the tab 22 and the adapter piece 40 are ultrasonically welded, and the adapter piece 40 and the electrode terminal 30 are laser welded, because the melting point of the second insulating layer 60 is higher than that of the first insulating layer 122, the high temperature generated by ultrasonic welding and laser welding is blocked by the second insulating layer 60 to reduce the heat transferred to the first insulating layer 122, that is, to insulate the first insulating layer 122, thereby reducing the risk of melting the first insulating layer 122 at high temperature during welding. The second insulating layer 60 can also further insulate between the adapter piece 40 and the cover body 121, and the superimposed first insulating layer 122 and second insulating layer 60 are conducive to improving the insulation reliability. In this embodiment, along the first direction Z, the projection of the tab 22 is located within the outer contour range of the projection of the second insulating layer 60, that is, during ultrasonic welding and laser welding, the heat radiated outward by the circumferential edge of the tab 22 and the adapter piece 40 is always blocked by the second insulating layer 60 and transmitted to the first insulating layer 122, thereby better protecting the first insulating layer 122 during welding and reducing the risk of melting the first insulating layer 122 at high temperature during welding.

[0072] The first insulating layer 122 is made of plastic material; the second insulating layer 60 is made of PI glue (Polyimide, English name: Polyimide, abbreviated as PI), and the PI glue can withstand high temperature of 400°C or above.

[0073] In some embodiments, the projection of the second insulating layer 60 overlaps with the projection of the first insulating layer 122 in the first direction Z, i.e. the second insulating layer 60 covers the first insulating layer 122, and the second insulating layer 60 more comprehensively insulates and protects the first insulating layer 122.

[0074] According to a second aspect of embodiments of the present application, the embodiments of the present application further provide a battery device 200, as shown in Figure 10 The battery device 200 includes a box body 201, a box cover 202, and the battery cell 100 as described above. The box cover 202 covers the open end of the box body 201, and the box body 201 and the box cover 202 form an assembly space 203. The plurality of battery cells 100 are arrayed and assembled in the assembly space 203, and the plurality of battery cells 100 are connected in series, in parallel, or in a hybrid manner through the busbar components. The battery cell 100 is used for storing or supplying electric energy (i.e. for providing voltage and capacity).

[0075] According to a third aspect of embodiments of the present application, the embodiments of the present application further provide an energy storage device 300. In some embodiments, the energy storage device 300 includes the battery device 200 as described above, wherein the energy storage device 300 adopts a plurality of battery devices 200 in series, in parallel, or in a hybrid manner, as shown in Figure 11 so that the battery devices 200 are used for storing or supplying electric energy. In some other embodiments of the present application, the energy storage device 300 includes the battery cell 100 as described above, wherein the energy storage device 300 adopts a plurality of battery cells 100 in series, in parallel, or in a hybrid manner, so that the battery cells 100 are used for storing or supplying electric energy.

[0076] The energy storage device 300 can be a small, movable, and portable device, such as a portable energy storage battery used for outdoor camping, or a portable energy storage battery used by a street vendor. The energy storage device 300 can also be a large, fixed, and high-power industrial device, such as a large energy storage power station used by a power station. The energy storage device 300 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device 300 can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device 300 can store electric energy during a low electricity consumption period and supply electric energy to related users or electric devices during a high electricity consumption period. For another example, the energy storage device 300 can be an independent power supply energy storage cabinet or an energy storage container used in a construction site or a factory. For another example, the energy storage device 300 can be a large movable energy storage cabinet or an energy storage container used in a large event site.

[0077] As shown in Figure 11As shown, the energy storage device 300 provided in the embodiments of this application is preferably an energy storage cabinet, which includes a cabinet 301 and a plurality of battery devices 200, which are stacked and assembled in the cabinet 301.

[0078] In some embodiments, the energy storage device 300 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0079] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery cell 100 or each battery device 200 via pipelines for regulating the temperature of the battery cell 100.

[0080] As an example, the main control module can serve as a battery management unit for multiple battery cells 100 or multiple battery devices 200, used to monitor and manage these cells. The main control module can monitor information such as current, voltage, power, or temperature of the multiple battery cells 100 or multiple battery devices 200. For example, it can control the charging and discharging current and voltage of the multiple battery cells 100 or multiple battery devices 200. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0081] As an example, the central control module can serve as the battery management unit of the energy storage device 300, used to monitor and manage the energy storage device 300. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 300. For example, it can control the charging and discharging current and voltage of the energy storage device 300. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0082] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device 300.

[0083] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 300 that require electricity.

[0084] According to a fourth aspect of the embodiments of the present application, the embodiments of the present application further provide a power storage system. The power storage system comprises a power conversion device and the power storage device 300 as described above, the power conversion device being electrically connected between a power generation device and the power storage device 300, wherein the battery device 200 in the power storage device 300 is configured to store or provide electric energy.

[0085] Further, the power storage system can comprise one or more power conversion devices (PCS). The power generation device is configured to generate electric energy, and the electric energy generated by the power generation device can be stored in the power storage device (or the battery device 200, or the battery cell 100) through the power conversion device. As an example, the power generation device can be a solar panel, a hydroelectric power generation device, a fire power generation device, a wind power generation device, etc. The specific type of the power generation device is not limited in the present application.

[0086] According to a fifth aspect of the embodiments of the present application, the embodiments of the present application further provide a charging grid comprising a charging pile.

[0087] In some embodiments, the charging grid further comprises the power storage system as described above, the charging pile being electrically connected with the power storage system, wherein the battery device 200 of the power storage device 300 of the power storage system is configured to store electric energy, or the battery device 200 of the power storage device 300 of the power storage system is configured to provide electric energy for the charging pile.

[0088] In some embodiments, the charging grid further comprises the power storage system as described above, the charging pile being electrically connected with the power storage system, wherein the battery device 200 of the power storage device 300 of the power storage system is configured to store electric energy, or the battery device 200 of the power storage device 300 of the power storage system is configured to provide electric energy for the charging pile.

[0089] The charging pile can have one or more connectors, which are configured to be connected with a charging interface of a device to be charged (such as an electric vehicle), so as to supplement the energy to a power storage unit (such as a battery of an electric vehicle) of the device to be charged.

[0090] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: The shell includes a shell body and a shell cover, wherein the shell body and the shell cover are mutually closed along a first direction to form a receiving space; An electrode assembly is housed in the receiving space, the electrode assembly including a main body and tabs electrically connected to the main body; Electrode terminals are inserted through the housing cover; An adapter piece is housed in the receiving space, and the electrode terminals are electrically connected to the electrode tabs through the adapter piece; The shell cover has a positioning structure on the inner side facing the receiving space. The positioning structure encloses a restricted space. At least a portion of the adapter piece is placed within the restricted space, and the positioning structure abuts against the adapter piece. The positioning structure is configured to restrict the displacement of the adapter piece. Along the first direction, the projection of the electrode terminal is located within the area of ​​the projection of the restricted space.

2. The battery cell according to claim 1, characterized in that, The positioning structure includes a protrusion that encloses the restricted space.

3. The battery cell according to claim 2, characterized in that, Along the first direction, the height of the end face of the protrusion beyond the electrode terminal is H1, and the thickness of the adapter piece is H2, 0≤H2-H1≤3mm.

4. The battery cell according to claim 2 or 3, characterized in that, The number of the protrusions is at least four, the at least four protrusions are arranged circumferentially at intervals, and the at least four protrusions are located on opposite sides of the adapter piece. Alternatively, the number of protrusions is at least four, the at least four protrusions are arranged circumferentially at intervals, and the outline shape of the adapter piece projected along the first direction is rectangular, with at least one of the protrusions abutting each side of the adapter piece.

5. The battery cell according to claim 4, characterized in that, The cross-sectional profile of the protrusion perpendicular to the first direction is one of square, circle, semicircle, or regular polygon.

6. The battery cell according to claim 2 or 3, characterized in that, The positioning structure includes a continuous series of protrusions, either closed-loop or non-closed-loop, which enclose the restricted space.

7. The battery cell according to any one of claims 1-3, characterized in that, The cover includes a cover body and a first insulating layer. The first insulating layer is disposed on the side of the cover body facing the receiving space. The positioning structure is integrally formed with the first insulating layer, and the electrode terminals are insulated from the cover body.

8. The battery cell according to claim 7, characterized in that, The battery cell further includes a second insulating layer, which is disposed between the first insulating layer and the adapter piece. The second insulating layer surrounds the electrode terminal, and the melting point of the second insulating layer is greater than that of the first insulating layer.

9. The battery cell according to claim 8, characterized in that, Along the first direction, the projection of the electrode is located within the outer contour of the projection of the second insulating layer.

10. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-9.

11. An energy storage device, characterized in that, The energy storage device includes a battery cell as described in any one of claims 1-9; Alternatively, the energy storage device may include the battery device as described in claim 10.

12. An energy storage system, characterized in that, include: Power conversion device; as well as, The energy storage device as described in claim 11, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

13. A charging grid, characterized in that, Including charging stations; The charging grid further includes the energy storage device as described in claim 11, wherein the charging pile is electrically connected to the energy storage device; Alternatively, the charging grid may further include the energy storage system as described in claim 12, wherein the charging pile is electrically connected to the energy storage system.

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