Battery cell, related device, equipment, energy storage system and charging grid

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery monomer, a related device, equipment, an energy storage system and a charging grid. The battery cell comprises: an electrode assembly comprising a body part and a tab part; the switching piece comprises a connecting piece body and a hollow switching protrusion, the position, directly facing the switching protrusion, of the connecting piece body is hollowed out and communicated with a cavity of the switching protrusion, the circumferential side wall of the switching protrusion comprises at least one first side wall, and the side, away from the switching protrusion, of the connecting piece body is provided with at least one tab connecting area electrically connected with the tab part; in the height direction of the battery monomer, the projection of the first side wall is positioned in a circumcircle of the projection of the switching bulge and is not overlapped with the circumcircle; the shell cover is provided with an assembly hole, and the switching bulge is arranged in the assembly hole in a penetrating manner; and the pole structure is mounted on one side, deviating from the switching piece, of the shell cover, covers the assembly hole and is electrically connected with the top wall of the switching bulge. The application of the technical scheme includes but is not limited to solving the problem that the capability of passing a relatively large current at the connection position of the switching piece and the tab is limited due to the reduction of the contact area between the switching piece and the tab in the prior art.

Description

Technical Field

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

[0002] In a square battery cell, the terminal post structure and the tabs of the electrode assembly are electrically connected via an adapter plate. Currently, the terminal post structure is cylindrical, and the adapter protrusions on the adapter plate used for electrical connection with the terminal post structure are also correspondingly cylindrical. These cylindrical protrusions occupy a large area of ​​the adapter plate, thus reducing the contact area between the adapter plate and the tab. This is particularly noticeable when the electrode assembly is thin. Because the contact area between the adapter plate and the tab is reduced, the resistance and thermal resistance at the connection point between the tab and the adapter plate are higher, limiting the ability of this connection point to carry a large current. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, related devices, equipment, energy storage system, and charging grid, including but not limited to solving the problem in related technologies where the reduced contact area between the adapter and the tab limits the ability of the connection point between the adapter and the tab to carry a large current.

[0004] To achieve the above objectives, according to a first aspect of this application, a battery cell is provided, comprising:

[0005] An electrode assembly includes a body portion and an electrode tab portion extending out of the body portion;

[0006] The adapter includes an adapter body and a hollow adapter protrusion. The adapter body and the adapter protrusion are hollowed out and communicate with the cavity of the adapter protrusion. The hollowed-out hole wall is flush with the inner wall of the cavity of the adapter protrusion. The circumferential sidewall of the adapter protrusion includes at least one first sidewall. The adapter body is provided with at least one tab connection area that is electrically connected to the tab on the side away from the adapter protrusion. The tab connection area is correspondingly provided with the first sidewall. In the height direction of the battery cell, the projection of the first sidewall is located inside the outer circle of the projection of the adapter protrusion and does not coincide with the outer circle.

[0007] The cover is provided with an assembly hole, and the transition protrusion passes through the assembly hole;

[0008] The pole structure is installed on the side of the housing cover away from the adapter plate. The pole structure covers the mounting hole and is electrically connected to the top wall of the adapter protrusion.

[0009] In the battery cell provided in the embodiments of this application, since the outer wall of the adapter protrusion is provided with at least one first sidewall, compared with the cylindrical adapter protrusion of the prior art, this increases the area of ​​the region where the contact body and the tab are electrically connected. That is, the area of ​​the tab connection region on the side of the contact body away from the adapter protrusion that is electrically connected to the tab is increased, thereby increasing the total contact area between the tab connection region and the tab of the contact body. Thus, because the total contact area between the tab connection region and the tab of the contact body is increased, the resistance and thermal resistance at the connection point between the tab connection region and the tab of the contact body will be reduced. The problem of local overheating at the connection point between the tab connection region and the tab of the contact body due to large current is eliminated, improving the ability of the connection point between the tab connection region and the tab of the contact body to carry larger currents, and improving the high-current fast charging performance and high-current output performance of the battery cell.

[0010] In some embodiments of this application, the circumferential sidewall of the adapter protrusion includes two opposing first sidewalls, and the contact body has two tab connection areas corresponding one-to-one with the two first sidewalls. The battery cell includes two electrode assemblies, and the tab portions of the two electrode assemblies are electrically connected to the two tab connection areas respectively. The area of ​​each tab portion of the two electrode assemblies electrically connected to the two tab connection areas of the contact body is increased, thereby increasing the total contact area between the two tab portions of the two electrode assemblies and the two tab connection areas of the contact body.

[0011] In some embodiments of this application, both first sidewalls are flat walls, parallel to each other, and parallel to the width direction of the tab. This results in a regular overall shape for the adapter piece, simplifying its shape and structure.

[0012] In some embodiments of this application, both first sidewalls are convex arc-shaped sidewalls, and the curvature of the projection of the first sidewall along the height direction of the battery cell is less than the curvature of the circumcircle of the projection of the transition protrusion; or, both first sidewalls are concave arc-shaped sidewalls, and the inner walls of the cavities corresponding to the two first sidewalls are spaced apart. This increases the contact area between the tab connection area of ​​the contact body and the tab portion, that is, the area where the two tab portions of the two electrode assemblies are electrically connected to the two tab connection areas of the contact body is increased, thereby increasing the total contact area between the two tabs of the two electrode assemblies and the two tab connection areas of the contact body.

[0013] In some embodiments of this application, the end of the tab furthest from the body is aligned with the hollowed-out wall of the connector body. This increases the contact area between the tab connection area of ​​the connector body and the tab, that is, the area where the two tabs of the two electrode assemblies are electrically connected to the two tab connection areas of the connector body is increased, thereby increasing the total contact area between the two tabs of the two electrode assemblies and the two tab connection areas of the connector body.

[0014] In some embodiments of this application, the circumferential sidewalls of the transition protrusion further include two opposing first arc-shaped transition walls, which alternately connect end-to-end. This reduces the likelihood of stamping breakage during the stamping process of the transition protrusion, thereby improving the yield rate of the transition piece.

[0015] In some embodiments of this application, the wall of the mounting hole is adapted to the circumferential sidewall of the transition protrusion. Thus, the mounting hole provides positioning and constraint for the transition protrusion, facilitating its insertion into the mounting hole and improving assembly efficiency.

[0016] In some embodiments of this application, both first arc-shaped transition walls are convex arc-shaped walls, and the circles in which the projections of the two first arc-shaped transition walls lie along the height direction of the battery cell are concentric circles.

[0017] In some embodiments of this application, the projections of the two first arcuate transition walls lie on the same circle.

[0018] In some embodiments of this application, both first arc-shaped transition walls are concave arc-shaped walls, and the cavity inner walls corresponding to the two first arc-shaped transition walls are spaced apart.

[0019] In some embodiments of this application, the adapter piece is a one-piece molded component.

[0020] In some embodiments of this application, the shell cover includes an insulating layer and a metal plate layer, the insulating layer and the metal plate layer are stacked and fixed, the pole post structure is installed on the metal plate layer, and the pole post structure and the metal plate layer are insulated from each other.

[0021] In some embodiments of this application, the electrode structure includes an electrode terminal, an assembly ring, and an insulating connection portion. The assembly ring is sleeved on the electrode terminal and includes an inner ring region and an outer ring region surrounding the inner ring region. The inner ring region is connected to the electrode terminal via the insulating connection portion to insulate the assembly ring from the electrode terminal. The outer ring region is welded to a metal plate layer, and the electrode terminal is welded to an adapter protrusion. Because the electrode terminal and the assembly ring are connected via the insulating connection portion, the electrode terminal is insulated from the metal plate layer.

[0022] According to a second aspect of this application, a battery device is provided. The battery device includes:

[0023] Box body;

[0024] The lid fits snugly against the body of the box to create an assembly space; and

[0025] As mentioned above, the battery cells are installed in the assembly space.

[0026] According to a third aspect of this application, an energy storage device is provided. The energy storage device includes a plurality of battery cells as described above, the battery cells being used to store electrical energy or supply power; or, the energy storage device includes a battery assembly as described above, the battery assembly being used to store electrical energy or supply power.

[0027] According to a fourth aspect of this application, an energy storage system is provided. The energy storage system includes: a power conversion device and an energy storage device as described above, wherein the power conversion device is electrically connected between a power generation device and the energy storage device.

[0028] According to a fifth aspect of this application, a charging grid is provided. The charging grid includes charging piles; the charging grid also includes an energy storage device as described above, with the charging piles electrically connected to the energy storage device; or, the charging grid also includes an energy storage system as described above, with the charging piles electrically connected to the energy storage system; wherein the energy storage device is used to provide electrical energy to the charging piles.

[0029] According to a sixth aspect of this application, an electrical device is provided. The electrical device includes an electrical load; the electrical device further includes a plurality of battery cells as described above, with the electrical load electrically connected to the plurality of battery cells; or, the electrical device further includes a battery device as described above, with the electrical load electrically connected to the battery device; or, the electrical device further includes an energy storage device as described above, with the electrical load electrically connected to the energy storage device; or, the electrical device further includes an energy storage system as described above, with the electrical load electrically connected to the energy storage system; wherein the battery cells are used to store or provide electrical energy. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0032] Figure 2 for Figure 1A schematic diagram of the exploded battery cell is shown.

[0033] Figure 3 for Figure 1 The diagram shows the assembly structure of the electrode assembly, adapter plate, shell cover and terminal post of the battery cell, in which the shell body has been removed;

[0034] Figure 4 for Figure 3 A schematic diagram of the decomposition process;

[0035] Figure 5 for Figure 3 A top-down view;

[0036] Figure 6 for Figure 5 Schematic diagram of the cross section of AA;

[0037] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0038] Figure 8 for Figure 3 A diagram showing the view from below;

[0039] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0040] Figure 10-1 This is a schematic diagram of the structure of the adapter piece for a battery cell in an embodiment of this application;

[0041] Figure 10-2 for Figure 10-1 A diagram showing the view from below;

[0042] Figure 11 This is a schematic diagram of the structure of the insulating layer of the battery cell casing in an embodiment of this application;

[0043] Figure 12 for Figure 11 Enlarged view of point D in the middle;

[0044] Figure 13 for Figure 11 A top view of the insulating layer is shown;

[0045] Figure 14 This is an exploded view of the battery device according to an embodiment of this application;

[0046] Figure 15 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0047] Figure 16 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application.

[0048] The figures in the diagram are labeled as follows:

[0049] 100. Battery cell;

[0050] 10. Electrode assembly; 11. Electrode tab; 111. Positive electrode tab; 112. Negative electrode tab; 12. Body section;

[0051] 20. Shell body; 21. Receiving cavity; 22. Open end;

[0052] 30. Adapter piece; 31. Adapter piece body; 311. Electrode connection area; 32. Adapter protrusion; 321. First sidewall; 322. Top wall; 323. First arc-shaped transition wall;

[0053] 40. Shell cover; 41. Assembly hole; 411. Second flat wall; 412. Second arc-shaped transition wall; 42. Insulating layer; 43. Metal plate layer;

[0054] 50. Pole post structure; 51. Pole post terminal; 52. Assembly ring; 521. Inner ring area; 522. Outer ring area; 53. Insulating connection part;

[0055] 200. Battery device;

[0056] 201. Box body; 202. Box lid; 203. Assembly space;

[0057] 300. Energy storage equipment; 301. Cabinet;

[0058] 400. Electrical equipment;

[0059] 401. Electrical load; 402. Control device; 403. Frame; 404. Wheel;

[0060] 500. Projected outline of cylindrical transition protrusion. Detailed Implementation

[0061] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0062] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] Currently, judging from market developments, the application of new energy batteries (including but not limited to lithium batteries and sodium batteries) is becoming increasingly widespread. New energy batteries are not only used in energy storage systems for 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 police equipment, military equipment, and aerospace. With the continuous expansion of the application areas of new energy batteries, the market demand is also constantly increasing. Furthermore, as new energy batteries continue to develop, various fields are continuously raising their requirements for the electrical performance of new energy batteries, such as high-current fast charging performance and high-current output performance.

[0066] Generally, prismatic batteries store electrical energy through electrode assemblies and use terminal structures as the connection terminals for outputting electrical energy. Between the electrode assemblies and the terminal structures, adapter plates connect the tabs of the electrode assemblies to the corresponding terminal structures. Therefore, the overcurrent capacity of the adapter plates becomes one of the key factors affecting the high-current fast charging performance and high-current output performance of prismatic batteries.

[0067] In related technologies, the terminal structure of a square battery is cylindrical, and correspondingly, the adapter protrusion on the adapter plate for electrical connection with the terminal structure is also cylindrical. Since current cylindrical adapter protrusions are generally formed by stamping, this reduces the contact area between the remaining area around the cylindrical adapter protrusion and the tab, resulting in higher resistance and thermal resistance at the connection point between the tab and the adapter plate, thus limiting the ability of this connection point to carry a large current.

[0068] Based on the above considerations, embodiments of this application provide a battery cell in which, in the adapter piece used for connecting the terminal post structure and the tab, the outer wall of the adapter protrusion is provided with at least one first sidewall. This increases the area of ​​the tab connection region 311 for electrical connection between the adapter body and the tab, thereby increasing the total contact area between the adapter body and the tab. Consequently, the resistance and thermal resistance at the connection point between the adapter body and the tab are reduced, improving the ability of the connection point to carry a larger current. Furthermore, this battery cell is used in the assembly and production of battery devices, energy storage devices, energy storage systems, charging grids, and electrical appliances.

[0069] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0070] like Figure 1 As shown in the figure, the X direction is the width direction of the battery cell 100, the Y direction is the length direction of the battery cell 100, and the Z direction is the height direction of the battery cell 100.

[0071] like Figures 1 to 6 , Figure 10-1 and Figure 10-2As shown, the battery cell 100 provided in the embodiments of this application includes an electrode assembly 10, a housing body 20, an adapter piece 30, a housing cover 40, and a terminal post structure 50. The electrode assembly 10 includes a body portion 12 and an electrode tab portion 11 extending from the body portion 12. The housing body 20 has a receiving cavity 21 and an open end 22 communicating with the receiving cavity 21. The adapter piece 30 includes a connector body 31 and a hollow adapter protrusion 32. The connector body 31 and the adapter protrusion 32 are hollowed out at positions directly opposite each other and communicate with the cavity of the adapter protrusion 32. The wall of the hollowed-out hole is flush with the inner wall of the cavity of the adapter protrusion 32. The housing cover 40 is provided with an assembly hole 41. The electrode assembly 10 is installed in the receiving cavity 21. The circumferential sidewall of the adapter protrusion 32 includes at least one first sidewall 321. The contact body 31, on the side opposite to the adapter protrusion 32, has at least one tab connection area 311 electrically connected to the tab portion 11. The tab connection area 311 is correspondingly arranged with the first sidewall 321. Along the height direction Z of the battery cell 100, the projection of the first sidewall 321 is located within the outer circle of the projection of the adapter protrusion 32 and does not coincide with the outer circle. The cover 40 closes to the opening end 22, and the adapter protrusion 32 passes through the mounting hole 41. The pole structure 50 is installed on the side of the cover 40 opposite to the adapter 30, and the pole structure 50 covers the mounting hole 41 and is electrically connected to the top wall 322 of the adapter protrusion 32.

[0072] It should be clarified that the statement "the projection of the first sidewall 321 is located within the circumcircle of the projection of the transition protrusion 32 along the height direction Z of the battery cell 100" does not include the following case: the projection of the first sidewall 321 coincides with the circumcircle of the projection of the transition protrusion 32 along the height direction Z of the battery cell 100. In other words, the projection of the first sidewall 321 is inward relative to the circumcircle of the projection of the transition protrusion 32 along the height direction Z of the battery cell 100.

[0073] like Figure 9 As shown in the figure, the dashed circle represents the projected outline 500 of the cylindrical transition protrusion, which is the circumcircle of the projection of the aforementioned transition protrusion 32. When the center point of the projection of the cylindrical transition protrusion coincides with the center point of the projection of the transition protrusion 32 of the transition piece 30 in this embodiment, it can be seen that the first sidewall 321 provided on the outer sidewall of the transition protrusion 32 in this application significantly increases the area of ​​the tab connection region 311 of the connector body 31.

[0074] The adapter piece 30 is a one-piece molded component. That is, during the manufacturing of the adapter piece 30, a metal blank is stamped to form the adapter protrusion 32, while the remaining portion of the metal blank becomes the adapter body 31. Therefore, the adapter protrusion 32 is a hollow structure with a top wall 322, and the area directly opposite the adapter protrusion 32 is hollowed out. The tab connection area 311, which electrically connects the adapter body 31 to the tab portion 11, is a local area within the circumferential region of the adapter protrusion 32, and the tab connection area 311 corresponds to the first sidewall 321. Furthermore, in the square battery cell 100, the width direction of the tab portion 11 is substantially parallel to the length direction Y of the battery cell 100, such as... Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the tab 11 needs to be folded towards the body 12 so that the tab 11 extends along the width direction X of the battery cell 100. Therefore, the area that affects the total contact area between the tab connection area 311 of the contact body 31 and the tab 11 is actually located on both sides of the transition protrusion 32 along the width direction X. In this embodiment, the tab connection area 311, which electrically connects the contact body 31 and the tab 11, is located on at least one side of the two sides of the transition protrusion 32 along the width direction X.

[0075] Furthermore, the "electrical connection between the tab connection area 311 of the contact body 31 and the tab portion 11" includes, but is not limited to, welding the tab connection area 311 of the contact body 31 and the tab portion 11 together using ultrasonic welding, laser welding, or wave soldering, thereby achieving electrical connection. In this square battery cell 100, the "electrical connection between the terminal post structure 50 and the top wall 322 of the transition protrusion 32" is achieved by welding the terminal post structure 50 and the top wall 322 of the transition protrusion 32 together using laser welding, thereby achieving electrical connection.

[0076] When the cover 40 is closed onto the opening end 22 of the shell body 20, in order to ensure a firm and sealed connection between the cover 40 and the opening end 22, the fixing method between the cover 40 and the opening end 22 includes, but is not limited to, welding by laser welding or shielded metal arc welding. In this embodiment, laser welding is preferred to weld the sealing seam between the cover 40 and the opening end 22.

[0077] In the battery cell 100 provided in the embodiments of this application, since at least one first sidewall 321 is provided on the outer wall of the adapter protrusion 32, compared with the cylindrical adapter protrusion of the related art, the area of ​​the tab connection region 311 of the contact body 31 is increased. That is, the area of ​​the area of ​​the contact body 31 that is electrically connected to the tab portion 11 on the side away from the adapter protrusion 32 is increased, thereby increasing the total contact area between the tab connection region 311 of the contact body 31 and the tab portion 11. In this way, since the total contact area between the tab connection area 311 and the tab portion 11 of the contact body 31 is increased, the resistance and thermal resistance at the connection position between the tab connection area 311 and the tab portion 11 of the contact body 31 will be reduced. The problem of local overheating at the connection position between the tab connection area 311 and the tab portion 11 of the contact body 31 due to the passage of large current will no longer occur. This improves the ability of the connection position between the contact body 31 and the tab portion 11 to pass a large current, and improves the high-current fast charging performance and high-current output performance of the battery cell 100.

[0078] In some embodiments of this application, such as Figures 2 to 6 , Figure 8 , Figure 10-1 and Figure 10-2As shown, the battery cell 100 includes two electrode assemblies 10, which are stacked and assembled within the receiving cavity 21. The tabs 11 of the two electrode assemblies 10 are folded towards each other so that they extend along the width direction X of the battery cell 100. In some embodiments of this application, after the tabs 11 of the two electrode assemblies 10 are folded, they can be stacked on top of each other, and the stacked tabs 11 are then welded to the contact body 31 of the adapter 30. Alternatively, in other embodiments of this application, after the tabs 11 of the two electrode assemblies 10 are folded, the ends of the tabs 11 of the two electrode assemblies 10 face each other and are spaced apart, and the tabs 11 of the two electrode assemblies 10 are respectively welded to the two tab connection areas 311 of the contact body 31 of the adapter 30. In the battery cell 100 of the embodiments of this application, preferably, the ends of the tabs 11 of the two electrode assemblies 10 are facing each other and spaced apart, and the circumferential sidewall of the transition protrusion 32 includes two opposing first sidewalls 321. The contact body 31 is provided with two tab connection areas 311 corresponding one-to-one with the two first sidewalls 321, and the tabs 11 of the two electrode assemblies 10 are electrically connected to the two tab connection areas 311 respectively. Since the outer wall of the transition protrusion 32 is provided with two opposing first sidewalls 321, the area of ​​the tab connection area 311 of the contact body 31 is increased. That is, the area of ​​the tab connection area 311 where the tabs 11 of the two electrode assemblies 10 are electrically connected to the contact body 31 is increased, thereby increasing the total contact area between the tabs 11 of the two electrode assemblies 10 and the contact body 31. This reduces the resistance and thermal resistance at the connection point between the tabs 11 of the two electrode assemblies 10 and the tab connection area 311 of the contact body 31, preventing local overheating caused by large current. This improves the ability of the connection point between the tab connection area 311 of the contact body 31 and the tabs 11 to carry larger currents, thereby improving the high-current fast charging performance and high-current output performance of the battery cell 100.

[0079] In some embodiments of this application, such as Figures 8 to 10-2 As shown, both first sidewalls 321 are flat walls and parallel to each other. This gives the adapter piece 30 a regular overall shape, simplifying its shape and structure. Furthermore, the shape and structure of the stamping die used to form the adapter piece 30 are correspondingly simplified, which facilitates die fabrication, reduces the difficulty of die fabrication, and lowers die costs.

[0080] like Figures 8 to 10-2As shown, in some embodiments of this application, when the electrode assembly 10 is placed into the assembly receiving cavity 21, the two first sidewalls 321 are parallel to the width direction of the tab portion 11; in other words, the first sidewalls 321 are parallel to the length direction Y of the battery cell 100. Furthermore, the end of the die-cut tab portion 11 away from the body portion 12 is flush. Therefore, when the tab portion 11 is folded towards the body portion 12 until it extends along the width direction X of the battery cell 100, the end of the tab portion 11 is parallel to the first sidewalls 321. Since the end of the tab 11 is parallel to the first sidewall 321, only a slight adjustment to the tab 11 is needed to align the end of the tab 11 with the bottom edge of the first sidewall 321, preventing the tab 11 from extending directly below the transition protrusion 32. This allows for easy adjustment of the relative position between the end of the tab 11 and the first sidewall 321 (because the area directly below the transition protrusion 32 is open; if the tab 11 extends directly below the transition protrusion 32, the portion of the tab 11 located directly below the transition protrusion 32 will not have any contact with the tab body 31, and will be an invalid part, resulting in a waste of material for the tab 11).

[0081] The electrode assembly 10 is formed by sequentially stacking and winding a first diaphragm, a cathode sheet, a second diaphragm, and an anode sheet. The cathode sheet and anode sheet are collectively referred to as electrode sheets. The tab 11 is die-cut during the die-cutting process in the manufacturing of the electrode assembly 10, where the material strip is cut into electrode sheets. Specifically, in the die-cutting process, the cathode material strip is cut into cathode sheets and die-cut to obtain the positive electrode tab 111, and the anode material strip is cut into anode sheets and die-cut to obtain the negative electrode tab 112. Generally, as... Figure 8 and Figure 9 As shown, the end of the die-cut tab 11 away from the body 12 is flush, and the end of the tab 11 away from the body 12 is parallel to the length direction Y of the battery cell 100. When the tab 11 is folded toward the body 12 until the tab 11 extends along the width direction X of the battery cell 100 and is electrically connected to the connector body 31, along the arrangement direction from the cover 40 to the connector 30 (i.e., along the height direction Z of the battery cell 100), as... Figure 8 and Figure 9As shown, the end of the tab 11 away from the body 12 is aligned with the hollowed-out wall of the contact body 31. That is, the tab connection area 311 of the contact body 31 that is electrically connected to the tab 11 is located on both sides of the transition protrusion 32 along the width direction X. Since the outer wall of the transition protrusion 32 is provided with two opposing and parallel first sidewalls 321, the area of ​​the two tab connection areas 311 corresponding to the first sidewalls 321 of the contact body 31 is increased. That is, the area of ​​the tab connection areas 311 of the tabs 11 of the two electrode assemblies 10 that are electrically connected to the contact body 31 is increased, thereby increasing the total contact area between the tabs 11 of the two electrode assemblies 10 and the contact body 31. This reduces the resistance and thermal resistance at the connection point between the tabs 11 of the two electrode assemblies 10 and the two tab connection areas 311 of the contact body 31, preventing local overheating at the connection point between the tabs 11 of the two electrode assemblies 10 and the two tab connection areas 311 of the contact body 31 due to high current. This improves the ability of the connection point between the tab connection areas 311 and the tabs 11 of the contact body 31 to carry larger currents, thereby improving the high-current fast charging performance and high-current output performance of the battery cell 100.

[0082] like Figure 9 As shown in the figure, the dashed circle represents the projected outline 500 of the cylindrical transition protrusion. When the projected center point of the cylindrical transition protrusion coincides with the projected center point of the transition protrusion 32 of the adapter piece 30 in this embodiment, it can be seen that the cylindrical transition protrusion interferes significantly with the ends of the tabs 11 of the two electrode assemblies 10 on both sides along the width direction X of the battery cell 100. If the cylindrical transition protrusion is used to electrically connect with the tabs 11, the length of the tabs 11 must be shortened, or at least the portion of the tabs 11 that interferes with the cylindrical transition protrusion must be cut off. This reduces the total contact area between the tab 11 of the electrode assembly 10 and the contact body 31, which in turn increases the resistance and thermal resistance at the connection point between the tab 11 and the contact body 31. This affects the ability of the connection point between the contact body 31 and the tab 11 to carry a large current, thus affecting the high-current fast charging performance and high-current output performance of the battery cell 100.

[0083] Compared to the cylindrical transition protrusions of related technologies, such as Figure 9As shown, in this embodiment, the adapter protrusion 32 has first sidewalls 321 on both sides along the width direction X of the battery cell 100. The projection of the first sidewalls 321 is connected to the projection of the end of the tab 11 away from the body 12. This increases the area of ​​the electrical connection between the tabs 11 of the two electrode assemblies 10 and the contact body 31, thereby increasing the total contact area between the tabs 11 of the two electrode assemblies 10 and the contact body 31. This reduces the resistance and thermal resistance at the connection point between the tabs 11 of the two electrode assemblies 10 and the contact body 31, reducing the problem of localized overheating at the connection point between the two tabs 11 of the two electrode assemblies 10 and the two tab connection areas 311 of the contact body 31 due to high current. This improves the ability of the connection point between the tab connection area 311 of the contact body 31 and the tab 11 to carry larger currents, thus improving the high-current fast charging performance and high-current output performance of the battery cell 100.

[0084] In some embodiments of this application, both first sidewalls 321 are convex arc-shaped sidewalls, and the curvature of the projection of the first sidewall 321 along the height direction Z of the battery cell 100 is less than the curvature of the circumcircle of the projection of the transition protrusion 32. Compared with the cylindrical transition protrusion of the related art, the contact area between the tab connection area 311 of the contact body 31 and the tab portion 11 is increased, which reduces the resistance and thermal resistance at the connection position between the tab portions 11 of the two electrode assemblies 10 and the contact body 31. This reduces the problem of local overheating at the connection position between the two tab portions 11 of the two electrode assemblies 10 and the two tab connection areas 311 of the contact body 31 due to large current, and improves the ability of the connection position between the tab connection area 311 of the contact body 31 and the tab portion 11 to carry a large current.

[0085] In other embodiments of this application, both first sidewalls 321 are concave arc-shaped sidewalls, and the inner walls of the cavities corresponding to the two first sidewalls 321 are spaced apart. Compared with the cylindrical transition protrusions of related technologies, the contact area between the tab connection area 311 of the contact body 31 and the tab portion 11 is increased, which reduces the resistance and thermal resistance at the connection position between the tab portions 11 of the two electrode assemblies 10 and the contact body 31. This reduces the problem of local overheating at the connection position between the two tab portions 11 of the two electrode assemblies 10 and the two tab connection areas 311 of the contact body 31 due to large current, and improves the ability of the connection position between the tab connection area 311 of the contact body 31 and the tab portion 11 to carry larger currents.

[0086] In this context, the terms "outward convexity" and "inward concavity" refer to the cavity of the transition protrusion 32. The arc-shaped wall curving away from the cavity of the transition protrusion 32 is called the outward convex sidewall, and the arc-shaped wall concave towards the cavity of the transition protrusion 32 is called the inward concavity sidewall. Similarly, the terms "outward convexity" and "inward concavity" below also refer to the cavity of the transition protrusion 32.

[0087] In some embodiments of this application, such as Figure 10-1 and Figure 10-2 As shown, the circumferential sidewalls of the transition protrusion 32 also include two opposing first arc-shaped transition walls 323. Both first arc-shaped transition walls 323 are outwardly convex arc-shaped sidewalls, and the two first sidewalls 321 and the two first arc-shaped transition walls 323 are alternately connected end to end. The two first arc-shaped transition walls 323 enable a smooth transition between the two first sidewalls 321, which helps to smoothly and efficiently stamp the transition protrusion 32, reduces the occurrence of stamping breakage during the stamping process, and improves the yield of the transition piece 30.

[0088] In this design, the central axes of the two outwardly protruding first arc-shaped transition walls 323 coincide, meaning that the projections of the two first arc-shaped transition walls 323 along the arrangement direction from the cover 40 to the adapter piece 30 (i.e., along the height direction Z of the battery cell 100) are concentric circles. Furthermore, the projections of the two first arc-shaped transition walls 323 may or may not lie on the same circle, and the curvature of the projections of the two first arc-shaped transition walls 323 is the same. At this time, the projection of the first sidewall 321 along the arrangement direction from the cover 40 to the adapter piece 30 (i.e., along the height direction Z of the battery cell 100) is two chords of this concentric circle, and the projection of the circumferential sidewall of the entire adapter protrusion 32 along the arrangement direction from the cover 40 to the adapter piece 30 (i.e., along the height direction Z of the battery cell 100) is racetrack-shaped. This results in the adapter piece 30 having a regular overall shape, simplifying its shape and structure. Furthermore, the shape and structure of the stamping die used for stamping the adapter piece 30 are simplified accordingly, which is beneficial to the preparation of the stamping die, reduces the difficulty of the preparation of the stamping die, and reduces the cost of the die.

[0089] In some other embodiments of this application, the central axes of the two convex first arc-shaped transition walls 323 are spaced apart, and the curvature of the projections of the two first arc-shaped transition walls 323 is the same. In this case, the projection of the circumferential sidewall of the entire transition protrusion 32 along the arrangement direction from the cover 40 to the transition piece 30 (i.e., along the height direction Z of the battery cell 100) is racetrack-shaped. This makes the transition piece 30 have a regular overall shape, simplifying its shape structure. Furthermore, the shape structure of the stamping die used for stamping the transition piece 30 is correspondingly simplified, which is beneficial for die fabrication, reduces the difficulty of die fabrication, and lowers die costs.

[0090] In some other embodiments of this application, both first arc-shaped transition walls 323 are concave arc-shaped sidewalls. Furthermore, the inner walls of the cavities corresponding to the two first arc-shaped transition walls 323 are spaced apart. The concave arrangement of the two first arc-shaped transition walls 323 helps to improve the overall mechanical strength of the transition protrusion 32.

[0091] In the battery cell 100 of this application, the wall of the mounting hole 41 is adapted to the circumferential sidewall of the transition protrusion 32. For example... Figures 11 to 13 As shown, the mounting hole 41 of the cover 40 includes at least one second flat wall 411. The second flat wall 411 is correspondingly disposed with the first side wall 321. When the transition protrusion 32 passes through the mounting hole 41, the first side wall 321 and the second flat wall 411 are positioned and assembled in a matching manner. The positioning and assembly between the first side wall 321 and the second flat wall 411 restricts the relative position between the transition protrusion 32 and the cover 40, thus restricting the relative position between the transition protrusion 32 and the pole post structure 50 installed on the cover 40. This allows the transition protrusion 32 and the pole post structure 50 to be quickly aligned, enabling accurate welding of the transition protrusion 32 and the pole post structure 50 to achieve electrical connection and improve assembly efficiency. Figure 12 and Figure 13 As shown, the mounting hole 41 of the cover 40 includes two opposing second flat walls 411 and two opposing second arcuate transition walls 412, which are alternately connected end to end. When the transition protrusion 32 passes through the mounting hole 41, the two second flat walls 411 are respectively matched and positioned with the two first side walls 321, that is, the two second flat walls 411 together restrict the movement of the transition protrusion 32 in the mounting hole 41 along the width direction X of the battery cell 100. Furthermore, the two second arcuate transition walls 412 are matched and positioned with the two first arcuate transition walls 323, that is, the two second arcuate transition walls 412 together restrict the movement of the transition protrusion 32 in the mounting hole 41 along the length direction Y of the battery cell 100. Therefore, by positioning and assembling the two second flat walls 411 with the two first side walls 321 respectively, and positioning and assembling the two second arc-shaped transition walls 412 with the two first arc-shaped transition walls 323 respectively, the relative position between the transition protrusion 32 and the shell cover 40 is precisely fixed, which in turn makes the relative position between the transition protrusion 32 and the pole post structure 50 installed on the shell cover 40 precisely fixed. The transition protrusion 32 and the pole post structure 50 can be quickly and accurately aligned, thereby accurately welding the transition protrusion 32 and the pole post structure 50 to achieve electrical connection and improve assembly efficiency.

[0092] In the embodiments of this application, the second arc-shaped transition wall 412 is adapted to the first arc-shaped transition wall 323, and the first side wall 321 is adapted to the second flat wall 411. Along the arrangement direction from the cover 40 to the adapter piece 30 (i.e., along the height direction Z of the battery cell 100), the projection of the first side wall 321 is connected to the projection of the second flat wall 411, and the projection of the first arc-shaped transition wall 323 is connected to the projection of the second arc-shaped transition wall 412. That is, when the adapter protrusion 32 passes through the mounting hole 41, the first side wall 321 is in contact with the second flat wall 411, and the first arc-shaped transition wall 323 is in contact with the second arc-shaped transition wall 412. This ensures that the relative position between the adapter protrusion 32 and the housing cover 40 is precisely fixed, which in turn ensures that the relative position between the adapter protrusion 32 and the pole post structure 50 installed on the housing cover 40 is precisely fixed. The adapter protrusion 32 and the pole post structure 50 can be quickly and accurately aligned, thereby accurately welding the adapter protrusion 32 and the pole post structure 50 to achieve electrical connection and improve assembly efficiency.

[0093] In some embodiments of this application, such as Figure 4 and Figure 7 As shown, the housing 40 includes an insulating layer 42 and a metal plate layer 43. The insulating layer 42 and the metal plate layer 43 are stacked and fixed together. The metal plate layer 43 helps to enhance the overall strength of the housing 40, while the insulating layer 42 serves to insulate the electrode assembly 10 from the metal plate layer 43 and the housing body 20. Furthermore, the electrode post structure 50 is mounted on the metal plate layer 43 and covers the mounting hole 41, with insulation between the electrode post structure 50 and the metal plate layer 43. The adapter protrusion 32 passes through the mounting hole 41 and is welded to the electrode post structure 50 to achieve electrical connection.

[0094] like Figures 1 to 5 As shown, in some embodiments of this application, the casing 40 is provided with two terminal structures 50. That is, the square battery cell 100 in this embodiment has a structure in which the positive and negative terminals are on the same side (one of which is the positive terminal structure 50, and the other is the negative terminal structure 50). Furthermore, the arrangement direction of the two terminal structures 50 is consistent with the width direction of the tab portion 11. When multiple battery cells 100 with positive and negative terminals on the same side are assembled to form the battery device 200, since the positive and negative terminals of the battery cells 100 are all located on the casing 40, multiple battery cells 100 can be connected in series, in parallel, and / or in mixed connections without flipping the battery cells 100, which is convenient and has high connection efficiency.

[0095] Of course, in some other embodiments of this application, the casing 40 may have only one terminal structure 50 as the positive terminal of the battery cell 100. Furthermore, another terminal structure 50 is provided on one side wall of the casing body 20 as the negative terminal of the battery cell 100, i.e., a structure with positive and negative terminals on both sides. Based on the requirements of actual usage scenarios, battery cells 100 with a structure featuring positive and negative terminals on both sides are adaptively selected for assembly into the battery device 200.

[0096] In some embodiments of this application, such as Figure 7 As shown, the pole structure 50 includes a pole terminal 51, an assembly ring 52 and an insulating connection part 53. The assembly ring 52 is sleeved on the pole terminal 51, and the assembly ring 52 and the pole terminal 51 are insulatedly connected through the insulating connection part 53. In the pole structure 50, the assembly ring 52 includes an inner ring region 521 and an outer ring region 522 surrounding the inner ring region 521. The inner ring region 521 is connected to the pole terminal 51 through an insulating connection part 53 to insulate the assembly ring 52 from the pole terminal 51. The inner ring region 521, the pole terminal 51, and the insulating connection part 53 are prepared by injection molding pre-embedding process. That is, the pole terminal 51 and the assembly ring 52 are placed in the cavity of a specially made injection mold, the relative position between the inner ring region 521 and the pole terminal 51 is adjusted, the mold is closed to fix the relative position between the assembly ring 52 and the pole terminal 51, and then molten insulating material is poured into the cavity of the mold. After the insulating material cools and solidifies to form the insulating connection part 53, the mold can be opened to obtain the pole structure 50. Furthermore, the outer ring region 522 is exposed outside the insulating connection portion 53. The outer ring region 522 is welded to the metal plate layer 43 by laser welding. The terminal post 51 and the transition protrusion 32 are also welded by laser welding. In this battery cell 100, since the terminal post 51 and the assembly ring 52 are connected by the insulating connection portion 53, the terminal post 51 and the metal plate layer 43 are insulated from each other. Thus, after the terminal post 51 and the transition protrusion 32 are welded, the transition protrusion 32 and the metal plate layer 43 are also insulated from each other.

[0097] In some embodiments of this application, such as Figures 1 to 5As shown, the projection of the terminal structure 50 along the arrangement direction from the shell cover 40 to the adapter plate 30 (i.e., along the height direction Z of the battery cell 100) is circular, and the top surface of the terminal structure 50 is set as a flat circular surface. Thus, when multiple battery cells 100 are assembled into a battery device 200, the battery cells 100 are connected in series, parallel, and / or mixed via terminals. The terminals are attached to the top surface of the terminal structure 50 from any angle, and the contact surface between the terminals and the terminal structure 50 is essentially the same, thereby reducing the conductivity differences between the terminals and different terminal structures 50 and ensuring the current-carrying capacity between each terminal structure 50 and its corresponding terminal.

[0098] According to a second aspect of the embodiments of this application, a battery device 200 is also provided. The battery device 200 includes a battery cell 100 as described above.

[0099] When a battery cell 100 as described above is assembled into a battery device 200 using the embodiments of this application, in the battery cell 100, since at least one first sidewall 321 is provided on the circumferential sidewall of the transition protrusion 32, compared with the cylindrical transition protrusion of the related art, the area of ​​the tab connection region 311 of the contact body 31 is increased. That is, the area of ​​the tab connection region 311 that is electrically connected to the tab portion 11 on the side of the contact body 31 away from the transition protrusion 32 is increased, thereby increasing the total contact area between the tab connection region 311 of the contact body 31 and the tab portion 11. In this way, because the total contact area between the tab connection area 311 and the tab portion 11 of the contact body 31 is increased, the resistance and thermal resistance at the connection point between the tab connection area 311 and the tab portion 11 of the contact body 31 will be reduced. This eliminates the problem of localized overheating at the connection point between the tab connection area 311 and the tab portion 11 due to high current flow, improving the ability of the connection point between the tab connection area 311 and the tab portion 11 of the contact body 31 to carry larger currents. Consequently, the high-current fast charging performance and high-current output performance of the battery cell 100 are also improved. Correspondingly, the high-current fast charging performance and high-current output performance of the battery device 200 assembled using this battery cell 100 are also improved.

[0100] The battery device 200 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 100, which are connected in series, parallel, and / or mixed-connection via busbars (including but not limited to battery terminals).

[0101] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 100.

[0102] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, a battery module can also be formed by bundling multiple battery cells 100 together with cable ties.

[0103] In some embodiments, the battery device 200 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0104] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0105] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 100 to the housing.

[0106] As an example, such as Figure 14 As shown, the battery device 200 includes a main body 201, a cover 202, and a plurality of battery cells 100 as described above. The cover 202 covers the main body 201 to form an assembly space 203, and the plurality of battery cells 100 are installed in the assembly space 203.

[0107] In some embodiments, the housing body 201 and the housing cover 202, which are combined to form a housing, can be part of the vehicle's chassis structure. For example, a portion of the housing body can be at least a part of the vehicle's floor, or a portion of the housing body can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0108] According to a third aspect of the embodiments of this application, an energy storage device 300 is also provided. In some embodiments, the energy storage device 300 includes a battery device 200 as described above, that is, the energy storage device 300 uses one battery device 200 or multiple battery devices 200 connected in series, parallel, or in a mixed configuration, such that these battery devices 200 are used to store electrical energy or provide electrical energy. In other embodiments, the energy storage device 300 includes a plurality of battery cells 100 as described above, that is, the energy storage device 300 uses a plurality of battery cells 100 connected in series, parallel, or in a mixed configuration, such that these battery cells 100 are used to store electrical energy or provide electrical energy.

[0109] Energy storage device 300 can be a small, portable device, such as a convenient energy storage battery used for outdoor tourism and camping, or a portable energy storage battery used by street vendors. Energy storage device 300 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used in a power plant. Energy storage device 300 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage device 300 can store electrical energy as needed and output it when appropriate. For example, energy storage device 300 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Other examples include independent power supply energy storage cabinets or energy storage containers used on construction sites or in factories, and larger, portable energy storage cabinets or energy storage containers used at large event venues.

[0110] like Figure 15 As shown, the energy storage device 300 is an energy storage cabinet, including a cabinet body 301 and multiple battery devices 200, which are stacked and assembled inside the cabinet body 301.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] As an example, the central control module can serve as the battery management unit of the energy storage device 300, used for monitoring and managing 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.

[0115] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0116] 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.

[0117] According to a fourth aspect of the embodiments of this application, embodiments of this application also provide an energy storage system. In some embodiments of this application, the energy storage system includes an energy storage device 300 as described above, the energy storage device 300 being used to store electrical energy or provide electrical energy. Alternatively, in other embodiments of this application, the energy storage system includes a battery device 200 as described above, the battery device 200 being used to store electrical energy or provide electrical energy. Alternatively, in still other embodiments of this application, the energy storage system includes a plurality of the aforementioned battery cells 100, these battery cells 100 being used to store electrical energy or provide electrical energy.

[0118] Furthermore, the energy storage system may include one or more power conversion systems (PCS) connected between the power generation equipment and the energy storage equipment (or battery device 200, or battery cell 100). The power generation equipment generates electrical energy, which can be stored in the energy storage equipment (or battery device 200, or battery cell 100) through the power conversion system. As examples, the power generation equipment may specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0119] According to a fifth aspect of an embodiment of this application, a charging grid is also provided, including charging piles.

[0120] In some embodiments of this application, the charging grid further includes an energy storage system as described above, which is used to store electrical energy or to provide electrical energy to the charging pile.

[0121] Alternatively, in some other embodiments of this application, the charging grid may further include an energy storage device 300 as described above, which is used to store electrical energy or to provide electrical energy to the charging pile.

[0122] Alternatively, in some other embodiments of this application, the charging grid may further include a battery device 200 as described above, which is used to store electrical energy or to provide electrical energy to the charging station.

[0123] Alternatively, in some other embodiments of this application, the charging grid may further include a plurality of the aforementioned battery cells 100, which are used to store electrical energy or to provide electrical energy to the charging station.

[0124] The charging pile may have one or more connectors, which are used to connect to the charging interface of the device to be charged (such as an electric vehicle), so as to replenish the energy storage unit (such as the battery of the electric vehicle) of the device to be charged.

[0125] According to a sixth aspect of the embodiments of this application, an electrical appliance 400 is also provided, which includes an electrical load 401.

[0126] Electrical equipment 400 includes, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys may include, but are not limited to, stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include, but are not limited to, airplanes, rockets, space shuttles, and spacecraft.

[0127] In some embodiments of this application, the electrical device 400 further includes an energy storage system as described above, which is used to store electrical energy or to provide electrical energy to the electrical load 401 so that the electrical load 401 can operate normally.

[0128] Alternatively, in some other embodiments of this application, the electrical device 400 may further include an energy storage device 300 as described above, that is, the electrical device 400 may employ one energy storage device 300 or multiple energy storage devices 300 connected in series, parallel, or in a mixed configuration. The energy storage device 300 is used to store electrical energy or to provide electrical energy to the electrical load 401, thereby enabling the electrical load 401 to operate normally.

[0129] Alternatively, in some other embodiments of this application, the electrical device 400 may further include a battery device 200 as described above, that is, the electrical device 400 may employ one battery device 200 or multiple battery devices 200 connected in series, parallel, or in a mixed configuration. The battery device 200 is used to store electrical energy or to provide electrical energy to the electrical load 401, thereby enabling the electrical load 401 to operate normally.

[0130] Alternatively, in some other embodiments of this application, the electrical device 400 may further include a plurality of battery cells 100 as described above, that is, the electrical device 400 uses a plurality of battery cells 100 connected in series, parallel or mixed. The battery cells 100 are used to store electrical energy or to provide electrical energy to the electrical load 401, thereby enabling the electrical load 401 to operate normally.

[0131] Among them, the electrical equipment 400 is an electric vehicle, and it is assembled using a battery device 200, such as Figure 16 As shown, the battery device 200 is mounted on the frame 403 of the electric vehicle. The electric vehicle includes the frame 403, a drive motor, and wheels 404. The battery device 200 and the drive motor are both fixedly mounted on the frame 403, and the wheels 404 are rotatably connected to the frame 403. The battery device 200 is electrically connected to the drive motor, and the drive motor is driven by the wheels 404. Using the battery device 200 provided in this application as the drive motor (the drive motor is one of the electrical loads 401 of the electrical equipment 400), the drive motor drives the wheels 404 to rotate, enabling the electric vehicle to drive normally. Furthermore, the electric vehicle includes a control device 402, which is mounted on the frame 403 and electrically connected to the battery device 200. The control device 402 is used to control and monitor the charging and discharging status of the battery device 200. In some electric vehicles, the battery housing of the battery device 200 can be part of the chassis structure of the electric vehicle. For example, a portion of the battery box can be at least part of the floor of the electric vehicle, or a portion of the battery box can be at least part of the crossbeams and longitudinal beams of the electric vehicle.

[0132] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: An electrode assembly includes a body portion and an electrode tab portion extending from the body portion; An adapter includes an adapter body and a hollow adapter protrusion. The adapter body is hollowed out at a position directly opposite the adapter protrusion and communicates with the cavity of the adapter protrusion. The hollowed-out hole wall is flush with the inner wall of the cavity of the adapter protrusion. The circumferential sidewall of the adapter protrusion includes at least one first sidewall. The adapter body has at least one tab connection area on the side away from the adapter protrusion that is electrically connected to the tab portion. The tab connection area is correspondingly arranged with the first sidewall. In the height direction of the battery cell, the projection of the first sidewall is located within the outer circle of the projection of the adapter protrusion and does not coincide with the outer circle. The cover is provided with an assembly hole, and the adapter protrusion passes through the assembly hole; A pole structure is installed on the side of the housing cover away from the adapter plate. The pole structure covers the mounting hole and is electrically connected to the top wall of the adapter protrusion.

2. The battery cell according to claim 1, characterized in that, The circumferential sidewall of the adapter protrusion includes two opposing first sidewalls. The contact body has two tab connection areas that correspond one-to-one with the two first sidewalls. The battery cell includes two electrode assemblies, and the tabs of the two electrode assemblies are electrically connected to the two tab connection areas respectively.

3. The battery cell according to claim 2, characterized in that, Both first sidewalls are flat walls, the two first sidewalls are parallel to each other, and both first sidewalls are parallel to the width direction of the tab portion.

4. The battery cell according to claim 2, characterized in that, Both first sidewalls are convex arc-shaped sidewalls, and along the height direction of the battery cell, the curvature of the projection of the first sidewall is less than the curvature of the circumcircle of the projection of the transition protrusion. Alternatively, both first sidewalls are concave arc-shaped sidewalls, and the cavity inner walls corresponding to the two first sidewalls are spaced apart.

5. The battery cell according to any one of claims 1-4, characterized in that, The end of the tab that is away from the main body is aligned with the hollowed-out wall of the tab body.

6. The battery cell according to any one of claims 2-4, characterized in that, The circumferential sidewall of the transition protrusion also includes two opposing first arc-shaped transition walls, which are alternately connected end to end.

7. The battery cell according to claim 6, characterized in that, The wall of the assembly hole is adapted to the circumferential sidewall of the transition protrusion.

8. The battery cell according to claim 7, characterized in that, Both of the first arc-shaped transition walls are convex arc-shaped walls, and the circles in which the projections of the two first arc-shaped transition walls lie along the height direction of the battery cell are concentric circles.

9. The battery cell according to claim 8, characterized in that, The projections of the two first arc-shaped transition walls lie on the same circle.

10. The battery cell according to claim 7, characterized in that, Both of the first arc-shaped transition walls are concave arc-shaped walls, and the cavity inner walls corresponding to the two first arc-shaped transition walls are spaced apart.

11. The battery cell according to claim 1, characterized in that, The adapter plate is a one-piece molded component.

12. The battery cell according to claim 1, characterized in that, The shell cover includes an insulating layer and a metal plate layer, the insulating layer and the metal plate layer are stacked and fixed together, the pole structure is installed on the metal plate layer, and the pole structure and the metal plate layer are insulated from each other.

13. The battery cell according to claim 12, characterized in that, The pole structure includes a pole terminal, an assembly ring, and an insulating connection portion. The assembly ring is sleeved on the pole terminal. The assembly ring includes an inner ring region and an outer ring region surrounding the inner ring region. The inner ring region is connected to the pole terminal through the insulating connection portion to insulate the assembly ring from the pole terminal. The outer ring region is welded to the metal plate layer, and the pole terminal is welded to the transition protrusion.

14. A battery device, characterized in that, include: Box body; A lid that fits onto the box body to form an assembly space; as well as The battery cell as described in any one of claims 1-13, wherein the battery cell is mounted in the assembly space.

15. An energy storage device, characterized in that, The energy storage device includes a plurality of battery cells as described in any one of claims 1-13, wherein the battery cells are used to store electrical energy or supply power. Alternatively, the energy storage device may include the battery device as described in claim 14, the battery device being used to store electrical energy or to supply power.

16. An energy storage system, characterized in that, include: Power conversion device, and The energy storage device as described in claim 15, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

17. A charging grid, characterized in that, Including charging stations; The charging grid further includes the energy storage device as described in claim 15, 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 16, wherein the charging pile is electrically connected to the energy storage system; The energy storage device is used to provide power to the charging pile.

18. An electrical appliance, characterized in that, Including electrical loads; The electrical equipment further includes a plurality of battery cells as described in any one of claims 1-13, and the electrical load is electrically connected to the plurality of battery cells; Alternatively, the electrical equipment may further include the battery device as described in claim 14, wherein the electrical load is electrically connected to the battery device; Alternatively, the electrical equipment may further include the energy storage device as described in claim 15, wherein the electrical load is electrically connected to the energy storage device; Alternatively, the electrical equipment may further include the energy storage system as described in claim 16, wherein the electrical load is electrically connected to the energy storage system; The battery cell is used to store or provide electrical energy.

Images