Battery monomer, battery device, energy storage device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery monomer, a battery device, an energy storage device and electric equipment. Wherein the battery cell comprises: a housing having an accommodating space, the inner wall of the accommodating space comprising a plurality of circumferentially spaced corner portions; the at least one electrode assembly is accommodated in the accommodating space, the circumferential surface of the electrode assembly comprises a plurality of arc-shaped surfaces which are circumferentially spaced, and each corner part directly faces at least one part of one arc-shaped surface; each supporting frame comprises a first side wall and a second side wall which are opposite to each other, each first side wall comprises at least one arc-shaped part, the arc-shaped parts are matched with the arc-shaped surfaces and are in insulation contact with the arc-shaped surfaces, and the second side walls are in contact with the inner walls of the containing spaces. By applying the technical scheme, the problems that the arc-shaped surface of the wound electrode assembly is vacant and unconstrained, the electrode assembly expands to cause the arc-shaped surface to crack, and the battery monomer cannot be normally charged and discharged are 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 and electrical equipment. Background Technology

[0002] Currently, battery cell electrode assemblies are mainly formed using a winding process. When the electrode assembly is assembled into the housing, there is no gap or constraint between the curved surface and the corresponding corner, while the other surfaces of the electrode assembly are restricted and constrained by the inner wall of the housing. During long-term use of the battery cell, the electrode assembly will expand. Because there is no gap or constraint between the curved surface and the corresponding corner, during the expansion of the electrode assembly, the portions of the electrode sheet and separator corresponding to the curved surface will be continuously stretched until the electrode sheet and / or separator are broken, i.e., the curved surface cracks, causing the battery cell to be unable to charge and discharge normally. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, battery device, energy storage device, and electrical equipment, including but not limited to solving the problem that the arc-shaped surface of the wound electrode assembly expands and cracks, causing the battery cell to be unable to charge and discharge normally.

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

[0005] The shell has a receiving space, the inner wall of which includes a plurality of circumferentially spaced corner portions;

[0006] At least one electrode assembly is housed in a receiving space, the circumferential surface of the electrode assembly comprising a plurality of circumferentially spaced arcuate surfaces, each corner being opposite at least a portion of one of the arcuate surfaces;

[0007] Multiple support frames, each support frame including a first sidewall and a second sidewall facing away from each other, the first sidewall including at least one arcuate portion adapted to and in insulating contact with an arcuate surface, the second sidewall contacting the inner wall of the receiving space.

[0008] In the battery cell provided in the embodiments of this application, the wound electrode assembly is assembled into the receiving space of the main shell. A support frame is provided between the arc-shaped surface of the electrode assembly and the corner of the inner wall of the main shell. The support frame supports and constrains the arc-shaped surface of the electrode assembly. Furthermore, the electrode assembly and the support frame are insulated from each other, thereby reducing the possibility of short circuit between the electrode assembly and the shell, and ensuring the electrical performance of the battery cell. Thus, during the long-term charging and discharging operation of the battery cell, the support frame effectively constrains and limits the stretching of the electrode sheets and separator at the arc-shaped surface of the electrode assembly, reducing the possibility of the electrode sheets and separator at the arc-shaped surface of the electrode assembly being torn, i.e., reducing the possibility of cracking of the arc-shaped surface of the electrode assembly, protecting the electrode assembly so that the battery cell can charge and discharge normally, and effectively extending the service life of the battery cell.

[0009] In some embodiments of this application, the housing includes a base plate, two first side plates, and two second side plates. The two first side plates and the two second side plates are alternately connected end-to-end to the base plate to enclose a square receiving space. The junction of adjacent first side plates and second side plates forms a corner, and the second side wall at least contacts the corresponding corner. This allows the support frame to stably support and constrain the arc-shaped surface, effectively restraining and limiting the stretching of the electrode sheets and diaphragms on the arc-shaped surface of the electrode assembly, and reducing the possibility of the electrode sheets and diaphragms on the arc-shaped surface of the electrode assembly being broken.

[0010] In some embodiments of this application, the second sidewall also contacts the inner wall of the corresponding first side plate and / or second side plate.

[0011] In some embodiments of this application, multiple support frames are provided in a one-to-one correspondence with multiple arc-shaped surfaces, which can effectively constrain and limit the stretching of the electrode sheets and diaphragms at the arc-shaped surfaces of the electrode assembly, and reduce the possibility of the electrode sheets and diaphragms at the arc-shaped surfaces of the electrode assembly being broken.

[0012] In some embodiments of this application, the battery cell includes an electrode assembly, with multiple arcuate surfaces of the electrode assembly corresponding to multiple corner portions, and a support frame is provided between each corner portion and the corresponding arcuate surface.

[0013] In some embodiments of this application, one electrode assembly corresponds to two opposing support frames. Each support frame has two arc-shaped portions on its first sidewall, and the two arc-shaped portions correspond one-to-one with two adjacent arc-shaped surfaces. The support frames exert a certain degree of converging force on the electrode assembly, thereby effectively constraining and limiting the stretching of the electrode sheets and diaphragms at the arc-shaped surfaces of the electrode assembly, reducing the possibility of the electrode sheets and diaphragms at the arc-shaped surfaces of the electrode assembly being broken.

[0014] In some embodiments of this application, the battery cell includes an electrode assembly. The second sidewall of each support frame includes a first flat wall, a second flat wall, and a third flat wall connected sequentially. The inner wall of the first sidewall is parallel to the length direction of the receiving space, and the inner wall of the second sidewall is parallel to the width direction of the receiving space. The first and third flat walls respectively contact the inner walls of the two first sidewalls, and the second flat wall contacts the inner wall of the second sidewall. This effectively constrains and limits the stretching of the electrode sheets and separator at the curved surface of the electrode assembly, reducing the possibility of the electrode sheets and separator at the curved surface of the electrode assembly breaking.

[0015] In some embodiments of this application, the battery cell includes multiple electrode assemblies, which are stacked along the width of the accommodating space. Each support frame's second sidewall includes a first flat wall, a second flat wall, and a third flat wall connected sequentially. In two adjacent support frames, the first flat wall of one support frame contacts the third flat wall of the other support frame. In multiple support frames located on the same side of the multiple electrode assemblies, multiple second flat walls contact the inner wall of the corresponding second side plate. In two support frames located at opposite ends in the stacking direction of the electrode assemblies, the first flat wall of one support frame and the third flat wall of the other support frame respectively contact the inner wall of the corresponding first side plate. This effectively constrains and limits the stretching of the electrode sheets and separators at the curved surface of the electrode assembly, reducing the possibility of breakage of the electrode sheets and separators at the curved surface of the electrode assembly.

[0016] In some embodiments of this application, the battery cell includes multiple electrode assemblies and two support frames. The multiple electrode assemblies are stacked along the width direction of the receiving space. The second sidewall of each support frame includes a first flat wall, a second flat wall, and a third flat wall connected in sequence. The inner wall of the first sidewall is parallel to the length direction of the receiving space, and the inner wall of the second sidewall is parallel to the width direction of the receiving space. The second flat walls of the two support frames contact the inner walls of the two second sidewalls, and the first and third flat walls of the two support frames contact the inner walls of the two first sidewalls, respectively. Furthermore, the first sidewall of each support frame is provided with multiple arc-shaped portions arranged along the width direction, and the multiple arc-shaped portions contact multiple arc-shaped surfaces one-to-one. This effectively constrains and limits the stretching of the electrode sheets and separators at the arc-shaped surfaces of the electrode assemblies, reducing the possibility of the electrode sheets and separators at the arc-shaped surfaces of the electrode assemblies being broken.

[0017] In some embodiments of this application, the two arc-shaped portions corresponding to the two adjacent arc-shaped surfaces of two adjacent electrode assemblies are connected by a rounded transition. This avoids the support frame having sharp ends that could puncture or scratch the electrode assemblies, causing internal short circuits and thermal runaway, thus improving the safety performance of the battery cell.

[0018] In some embodiments of this application, the support frame further includes two end sidewalls, each of which is connected to a first sidewall and a second sidewall, respectively. Along the length of the battery cell, the distance between the center of the end sidewall and its adjacent arcuate surface is less than or equal to 10 mm. This reduces the pressure exerted on the electrode assembly by the step formed by the end sidewall on the inner wall of the first side plate.

[0019] In some embodiments of this application, the inner wall of the first side plate has a stepped structure, and the support frame further includes two end side walls. The two sides of the end side walls are respectively connected to the first side wall and the second side wall, and the end side walls abut against the stepped structure. Furthermore, the inner wall of the first side plate is flush with the junction of the first side wall and the end side walls. In this embodiment, the edge region of the first side wall is flush with the inner wall of the first side plate, thus ensuring that the electrode assembly is not subjected to any compression when it abuts against the inner wall of the first side plate and transitions to the first side wall.

[0020] In some embodiments of this application, the height of the support frame is less than or equal to the height of the electrode assembly along the height direction of the accommodating space. While the support frame supports and constrains the arcuate surface of the electrode assembly, it ensures that the end cap assembly can be accurately and stably closed onto the opening end of the main shell.

[0021] In some embodiments of this application, the main shell and multiple support frames are integrated into a modular component, which can simplify the production process and improve assembly production efficiency.

[0022] In some embodiments of this application, the battery cell further includes an insulating film that circumferentially surrounds the electrode assembly and the support frame, and the insulating film is attached to the circumferential inner wall of the receiving space, further reducing the possibility of short circuit between the electrode assembly and the housing, so as to ensure the electrical performance of the battery cell.

[0023] In some embodiments of this application, the insulating film and multiple support frames are integrated into a modular component, which can simplify the production process and improve assembly production efficiency.

[0024] In some embodiments of this application, the battery cell further includes an insulating tray, which is attached to the inner wall of the receiving space. The electrode assembly, support frame and insulating film are all disposed on the insulating tray, and the insulating film and the insulating tray are sealed together, further reducing the possibility of short circuit between the electrode assembly and the housing, so as to ensure the electrical performance of the battery cell.

[0025] In some embodiments of this application, the insulating tray, insulating film and multiple support frames are integrated into a modular component, which can simplify the production process and improve assembly production efficiency.

[0026] According to a second aspect of an embodiment of this application, a battery device is provided. The battery device includes a battery cell as described above, the battery cell being used to store or provide electrical energy.

[0027] According to a third aspect of the embodiments of this application, an energy storage device is provided. Wherein:

[0028] The energy storage device includes battery cells as described above, which are used to store or provide electrical energy;

[0029] Alternatively, the energy storage device may include a battery device as described above, which is used to store or provide electrical energy.

[0030] According to a fourth aspect of the embodiments of this application, a method is provided.

[0031] An electrical appliance. The electrical appliance includes an electrical load; and,

[0032] The electrical equipment also includes multiple battery cells as described above, and the electrical load is electrically connected to the battery cells;

[0033] Alternatively, the electrical equipment may also include a battery device as described above, with the electrical load electrically connected to the battery device;

[0034] Alternatively, the electrical equipment may also include an energy storage device as described above, with the electrical load electrically connected to the energy storage device;

[0035] Among them, individual battery cells or battery devices are used to store or provide electrical energy. Attached Figure Description

[0036] 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.

[0037] Figure 1 This is a three-dimensional structural diagram of the first type of battery cell according to an embodiment of this application;

[0038] Figure 2 for Figure 1 The diagram shows a front view of a single battery cell;

[0039] Figure 3 for Figure 1 A schematic diagram of the exploded battery cell is shown.

[0040] Figure 4 for Figure 1 The diagram shows a top view of a single battery cell, in which the end cap assembly has been removed.

[0041] Figure 5 for Figure 2 Cross-sectional view along the AA direction;

[0042] Figure 6 for Figure 4 Cross-sectional view along the middle BB direction;

[0043] Figure 7 for Figure 5 Enlarged view of point C in the middle;

[0044] Figure 8 for Figure 1 A three-dimensional structural diagram of a support frame for a single battery cell is shown.

[0045] Figure 9 for Figure 1 A three-dimensional structural diagram of another support frame for a single battery cell is shown.

[0046] Figure 10 for Figure 1 A three-dimensional structural diagram of another type of support frame for a single battery cell is shown.

[0047] Figure 11 This is a partial cross-sectional schematic diagram of a second type of battery cell according to an embodiment of this application;

[0048] Figure 12 This is an exploded view of the third type of battery cell in an embodiment of this application;

[0049] Figure 13 This is an exploded view of the fourth type of battery cell according to an embodiment of this application;

[0050] Figure 14 This is an exploded view of the fifth type of battery cell in this application embodiment;

[0051] Figure 15 for Figure 14 Cross-sectional view along the DD direction;

[0052] Figure 16 for Figure 15 Enlarged view of point E in the middle;

[0053] Figure 17 This is an exploded view of a battery device according to an embodiment of this application;

[0054] Figure 18 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0055] Figure 19 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application.

[0056] The figures in the diagram are labeled as follows:

[0057] 100. Battery cell;

[0058] 10. Shell; 11. Main shell; 12. Accommodation space; 13. Corner; 14. Base plate; 15. First side plate; 16. Second side plate; 17. Stepped structure; 18. End cap assembly; 181. Cover body; 182. Pole post structure; 183. Pressure relief mechanism;

[0059] 20. Electrode assembly; 21. Curved surface; 22. Tab;

[0060] 30. Support frame; 31. First side wall; 311. Arc-shaped part; 32. Second side wall; 321. First flat wall; 322. Second flat wall; 323. Third flat wall; 33. End side wall; 34. Arc transition end;

[0061] 40. Insulating film;

[0062] 50. Insulating tray;

[0063] 200. Battery assembly; 201. Box body; 202. Box cover; 203. Assembly space;

[0064] 300. Energy storage device; 301. Cabinet;

[0065] 400. Electrical equipment; 410. Electrical load; 420. Control device; 430. Chassis; 440. Wheel. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants (batteries used in these applications are generally referred to as energy storage batteries), but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace (batteries used in these applications are generally referred to as power batteries). With the continuous expansion of battery device applications, the requirements for product quality in various fields are also constantly increasing. The quality requirements for battery devices include not only safety performance but also service life, demanding continuous improvement in both safety and lifespan.

[0071] In related technologies, the electrode assemblies of battery cells are mainly formed by winding. The wound electrode assemblies are typically compacted into a square structure, commonly known as square electrode assemblies. However, square electrode assemblies are not perfectly square. Due to the winding process, the electrode assembly has multiple spaced arc-shaped surfaces along its circumference. These arc-shaped surfaces are used to adapt to the corners of the inner wall of the housing, allowing the electrode assembly to be assembled into the housing's receiving space. When the electrode assembly is assembled into the housing's receiving space, there are gaps and no constraints between the arc-shaped surfaces and the corresponding corners, while the other surfaces of the electrode assembly are constrained by the inner wall of the housing.

[0072] During long-term use of a battery cell, the active materials in the electrode assembly undergo repeated reversible electrochemical reactions with the electrolyte, causing the electrode assembly to expand. Since there are gaps and no constraints between the curved surface and the corresponding corners, during the expansion process, the portions of the electrode plates and separator corresponding to the curved surface are continuously stretched until the plates and / or separator break, i.e., the curved surface cracks, preventing the battery cell from charging and discharging normally.

[0073] Based on the above considerations, embodiments of this application provide a battery cell, which is then used in the assembly and production of battery devices, energy storage devices, and electrical appliances. In this battery cell, a wound electrode assembly is assembled into the receiving space of the main casing. A support frame is provided between the arcuate surface of the electrode assembly and the corner of the inner wall of the main casing. The support frame provides support and constraint for the arcuate surface of the electrode assembly. Furthermore, the electrode assembly and the support frame are insulated, thereby reducing the possibility of a short circuit between the electrode assembly and the casing, ensuring the electrical performance of the battery cell. Thus, during long-term charging and discharging operations, the support frame effectively constrains and limits the stretching of the electrode sheets and separator at the arcuate surface of the electrode assembly, reducing the possibility of breakage of the electrode sheets and separator at the arcuate surface, i.e., reducing the possibility of cracking of the arcuate surface of the electrode assembly. This protects the electrode assembly, allowing the battery cell to charge and discharge normally, effectively extending the service life of the battery cell. Correspondingly, applying this battery cell to the assembly and production of battery devices, energy storage devices, and electrical equipment can help improve the service life of battery devices, energy storage devices, and electrical equipment.

[0074] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0075] According to a first aspect of the embodiments of this application, embodiments of this application provide a battery cell 100. For example... Figures 1 to 5 , Figures 7 to 10 As shown, the battery cell 100 includes a housing 10, at least one electrode assembly 20, and a plurality of support frames 30. The housing 10 includes a main shell 11, which forms a receiving space 12. The inner wall of the main shell 11 includes a plurality of circumferentially spaced corner portions 13. The electrode assembly 20 is received in the receiving space 12. The circumferential surface of the electrode assembly 20 includes a plurality of circumferentially spaced arcuate surfaces 21, and each corner portion 13 is opposite to at least a portion of one of the arcuate surfaces 21. The support frame 30 includes a first sidewall 31 and a second sidewall 32 facing away from each other. The first sidewall 31 includes at least one arcuate portion 311, which is adapted to and insulated from the arcuate surface 21. The second sidewall 32 contacts the inner wall of the receiving space 12. That is, the support frame 30 is used to support and constrain the arcuate surface 21 of the electrode assembly 20.

[0076] In the embodiments of this application, the battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 100 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] In the battery cell 100 provided in the embodiments of this application, the wound electrode assembly 20 is assembled into the receiving space 12 of the main shell 11. A support frame 30 is provided between the arc-shaped surface 21 of the electrode assembly 20 and the corner portion 13 of the inner wall of the main shell 11. The support frame 30 provides support and constraint for the arc-shaped surface 21 of the electrode assembly 20. Furthermore, the electrode assembly 20 and the support frame 30 are insulated from each other to prevent a short circuit between the electrode assembly 20 and the shell 10 due to the setting of the support frame 30. Thus, during the long-term charging and discharging operation of the battery cell 100, the support frame 30 provides support and constraint to the arc-shaped surface 21 of the electrode assembly 20. This effectively restricts the stretching of the electrode sheets and separator at the arc-shaped surface 21, reducing the possibility of breakage and cracking of the electrode assembly 20. This protects the electrode assembly 20, allowing the battery cell 100 to charge and discharge normally, effectively extending its service life. Furthermore, the electrode sheets and separator at the arc-shaped surface 21, supported and constrained by the support frame 30, are less likely to break. This reduces the possibility of direct contact between the positive and negative electrodes after the separator breaks, leading to an internal short circuit in the battery cell 100. In other words, it reduces the possibility of thermal runaway and improves the safety performance of the battery cell 100.

[0078] Furthermore, the electrode assembly 20 is supported and constrained by multiple support frames 30 within the receiving space 12, preventing it from wobbling relative to the main casing 11. This ensures the electrode assembly 20 remains stable within the receiving space 12. This effectively reduces the likelihood of the electrode assembly 20 wobbling within the receiving space 12 when the battery cell 100 is subjected to vibration or impact, and lowers the probability of electrical connection failure due to solder breakage of the tabs 22 of the electrode assembly 20. Moreover, when the battery cell 100 is subjected to impact, the support frames 30 mitigate the deformation of the main casing 11 caused by the external force, protecting the electrode assembly 20 from being crushed and cracked, thus improving the safety performance of the battery cell 100.

[0079] In some embodiments of this application, such as Figure 2 and Figure 3As shown, the main casing 11 includes a base plate 14, two first side plates 15, and two second side plates 16. The two first side plates 15 and the two second side plates 16 are alternately connected end-to-end to the base plate 14 to form a square receiving space 12. Correspondingly, the overall outer contour of the wound electrode assembly 20 is close to a cube shape, so that it can be fitted into the square receiving space 12 to improve the energy density of the battery cell 100. The cubic electrode assembly 20 has two large side surfaces with larger surface areas, two small side surfaces with smaller surface areas, a bottom end, and a top end. The two large side surfaces and the two small side surfaces alternately connect to form a complete circumferential surface. The transition position between adjacent large side surfaces and small side surfaces is the arc-shaped surface 21. One end of the electrode assembly 20 extending from the tab 22 is the top end, and the other end of the electrode assembly 20 is the bottom end. Figure 3 As shown, a corner portion 13 is formed at the junction of the adjacent first side plate 15 and the second side plate 16 of the main shell 11, that is, a total of four corner portions 13 are formed on the circumferential inner wall of the accommodating space 12 of the main shell 11. Correspondingly, the circumferential surface of the wound electrode assembly 20 is formed with arc-shaped surfaces 21 corresponding to the four corner portions 13. Each arc-shaped surface 21 and the corresponding corner portion 13 are supported and constrained by at least a portion of the support frame 30. Furthermore, the second side wall 32 is at least in contact with the corresponding corner portion 13, so that the support frame 30 can stably support and constrain the arc-shaped surface 21, effectively constraining and limiting the stretching of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20, and reducing the possibility of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20 being torn apart.

[0080] In some embodiments of this application, the second sidewall 32 also contacts the inner wall of the first side plate 15 and / or the second side plate 16. This increases the support area of ​​the housing 10 on the support frame 30, thereby enabling the support frame 30 to stably support and constrain the arcuate surface 21.

[0081] In some embodiments of the electrode assembly 20, two adjacent arcuate surfaces 21 along the width direction of the electrode assembly 20 can be continuously connected, forming a semi-circular arcuate surface. That is, the circumferential surface of the electrode assembly 20 no longer has small side faces; or rather, each small side face is extremely reduced to a straight edge at the junction of two adjacent arcuate surfaces 21. Therefore, as... Figure 8 and Figure 9 As shown, the two arcuate portions 311 of two corresponding adjacent arcuate surfaces 21 of the support frame 30 are connected, and the connection forms a continuous semicircular arcuate portion that adapts to the semicircular arcuate surface. Alternatively, as shown in the figure... Figure 10The multiple support frames 30 shown correspond to each arc surface 21. On two adjacent support frames 30 along the width direction of the electrode assembly 20, the two arc portions 311 merge to form a continuous semi-circular arc portion that is adapted to the semi-circular arc surface. At this time, the position (seam) where the electrode assembly 20 contacts the two support frames 30 is directly opposite the small side surface that is extremely reduced to a straight edge.

[0082] In some embodiments of this application, such as Figure 10 The support frame 30 shown has multiple support frames 30 corresponding to multiple arc-shaped surfaces 21. In this embodiment, the second sidewall 32 of the support frame 30 is formed into two parts with a bend, one part abutting against the first side plate 15 and the other part abutting against the second side plate 16. Furthermore, the first sidewall 31 of the support frame 30 is entirely formed into an arc-shaped portion 311 adapted to the arc-shaped surface 21 of the electrode assembly 20, thereby enabling the support frame 30 to stably support and constrain the arc-shaped surface 21. In this way, the multiple support frames 30 support and constrain the multiple arc-shaped surfaces 21 of the electrode assembly 20 in a one-to-one correspondence, thereby effectively constraining and limiting the stretching of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20, and reducing the possibility of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20 being torn apart.

[0083] In some embodiments of this application, the battery cell 100 includes only one electrode assembly 20, wherein multiple arcuate surfaces 21 of the electrode assembly 20 are correspondingly disposed with multiple corner portions 13 of the housing 10, and a spacing such as... is provided between each corner portion 13 and the corresponding arcuate surface 21. Figure 10 The support frame 30 shown can effectively constrain and limit the stretching of the electrode sheet and diaphragm on the arc surface 21 of the electrode assembly 20, reducing the possibility of the electrode sheet and diaphragm on the arc surface 21 of the electrode assembly 20 being torn apart.

[0084] In some embodiments of this application, such as Figure 9The support frame 30 shown corresponds to two opposing support frames 30 for each electrode assembly 20. Each support frame 30 has two arc-shaped portions 311 on its first sidewall 31, with each arc-shaped portion 311 corresponding to one of two adjacent arc-shaped surfaces 21. In the battery cell 100 of this embodiment, to maximize the energy density of the battery cell 100, two support frames 30 are arranged on both sides of the electrode assembly 20 along its length. Furthermore, in this embodiment, the support frames 30 exert a certain degree of convergence force on both ends of the electrode assembly 20 along its length (i.e., the edge regions of the two large side surfaces of the electrode assembly 20, the arc-shaped surfaces connecting to the large side surfaces, and the side ends composed of the small side surfaces). This convergence force is along the width direction of the electrode assembly 20, thereby effectively constraining and limiting the stretching of the electrode sheets and separators at the arc-shaped surfaces 21 of the electrode assembly 20, reducing the possibility of the electrode sheets and separators at the arc-shaped surfaces 21 of the electrode assembly 20 being broken.

[0085] In some embodiments of this application, the battery cell 100 includes an electrode assembly 20 and two corresponding support frames 30. In the support frames 30 of the battery cell 100, such as... Figure 9 As shown, the second sidewall 32 of each support frame 30 includes a first flat wall 321, a second flat wall 322, and a third flat wall 323 connected in sequence. The inner wall of the first side plate 15 is parallel to the length direction of the receiving space 12, and the inner wall of the second side plate 16 is parallel to the width direction of the receiving space 12. The first flat wall 321 and the third flat wall 323 respectively contact the inner walls of the two first side plates 15, and the second flat wall 322 contacts the inner wall of the second side plate 16, so that the support frame 30 can stably support and constrain the arc-shaped surface 21. This can effectively constrain and limit the stretching of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20, reducing the possibility of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20 being torn off.

[0086] In some embodiments of this application, such as Figures 3 to 5 , Figure 7 As shown, the battery cell 100 includes a plurality of electrode assemblies 20, which are stacked along the width direction of the receiving space 12. The battery cell 100 also includes a plurality of... Figure 9 The support frame 30 is shown. The number of support frames 30 is twice the number of battery cells 100. Optionally, the battery cell 100 includes two electrode assemblies 20 and four support frames 30. In the support frames 30 of the battery cell 100, as shown... Figure 9As shown, the second sidewall 32 of each support frame 30 includes a first flat wall 321, a second flat wall 322, and a third flat wall 323 connected in sequence. The inner wall of the first side plate 15 is parallel to the length direction of the receiving space 12, and the inner wall of the second side plate 16 is parallel to the width direction of the receiving space 12. All the second flat walls 322 are in contact with the inner wall of the second side plate 16. The first flat wall 321 of one of two adjacent support frames 30 is in contact with the third flat wall 323 of the other. The two support frames adjacent to the two first side plates 15 are respectively... In the support frame 30, the first flat wall 321 of one and the third flat wall 323 of the other are in contact with the inner walls of the two first side plates 15, respectively. Furthermore, in the multiple support frames 30 located on the same side of the multiple electrode assemblies 20, the multiple second flat walls 322 are in contact with the inner walls of the corresponding second side plates 16. In the two support frames 30 located at both ends in the stacking direction of the electrode assemblies 20, the first flat wall 321 of one support frame 30 and the third flat wall 323 of the other support frame 30 are in contact with the inner walls of the corresponding first side plates 15, respectively. This allows the support frame 30 to stably support and constrain the arc-shaped surface 21, thereby effectively constraining and limiting the stretching of the electrode sheets and diaphragms at the arc-shaped surface 21 of the electrode assembly 20, reducing the possibility of the electrode sheets and diaphragms at the arc-shaped surface 21 of the electrode assembly 20 being broken.

[0087] In some embodiments of this application, the battery cell 100 includes a plurality of electrode assemblies 20, and includes a plurality of... Figure 8 The support frame 30 shown is as follows: Figures 3 to 5 , Figure 7 As shown, multiple electrode assemblies 20 are stacked along the width direction of the receiving space 12. The number of support frames 30 is equal to the number of battery cells 100. Optionally, a battery cell 100 includes two electrode assemblies 20 and two support frames 30. In the support frames 30 of the battery cell 100, as shown... Figure 8 As shown, the second sidewall 32 of each support frame 30 includes a first flat wall 321, a second flat wall 322, and a third flat wall 323 connected in sequence. The inner wall of the first side plate 15 is parallel to the length direction of the receiving space 12, and the inner wall of the second side plate 16 is parallel to the width direction of the receiving space 12. The second flat walls 322 of the two support frames 30 respectively contact the inner walls of the two second side plates 16, and the first flat walls 321 and third flat walls 323 of the two support frames 30 respectively contact the inner walls of the two first side plates 15. Furthermore, the first sidewall 31 of each support frame 30 is provided with a plurality of arc-shaped portions 311 arranged along the width direction, and the plurality of arc-shaped portions 311 contact a plurality of arc-shaped surfaces 21 in a one-to-one correspondence. In this way, the support frame 30 can stably support and constrain the arc-shaped surfaces 21, thereby effectively constraining and limiting the stretching of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20, and reducing the possibility of the electrode sheet and diaphragm at the arc-shaped surface 21 of the electrode assembly 20 being torn apart.

[0088] In some embodiments of this application, such as Figure 11 As shown, between two adjacent electrode assemblies 20, the two arc-shaped portions 311 corresponding to the two adjacent arc-shaped surfaces 21 form an arc transition end 34. In this way, the arc transition end 34 is smooth and has no sharp points, so that the arc transition end 34 and the electrode assembly 20 make smooth and even contact, avoiding sharp ends from piercing or scratching the electrode assembly 20 and causing internal short circuits leading to thermal runaway, which is beneficial to improving the safety performance of the battery cell 100.

[0089] In some embodiments of this application, such as Figure 7As shown, the support frame 30 also includes two end sidewalls 33, with their two sides respectively connected to the first sidewall 31 and the second sidewall 32. When the electrode assembly 20 and the support frame 30 are assembled into the receiving space 12, at least a portion of the second sidewall 32 of the support frame 30 contacts the inner wall of the first side plate 15. At this time, the end sidewall 33 forms a step protruding from the inner wall of the first side plate 15. The larger side surface of the electrode assembly 20 abuts against the inner wall of the first side plate 15, covers the step, and transitions to abut against the first sidewall 31 of the support frame 30, thereby providing support and constraint for the arcuate surface 21. Because the end sidewall 33 forms a step protruding from the inner wall of the first side plate 15, the electrode assembly 20 is squeezed when it expands, resulting in stress concentration. This can cause the electrode assembly 20 to be damaged by the pressure, which may lead to the breakage of the electrode and the separator, preventing the battery cell 100 from charging and discharging normally. Alternatively, prolonged pressure may cause dendrites to precipitate on the electrode, puncturing the separator and causing an internal short circuit in the battery cell 100, leading to thermal runaway. Theoretically, it would be ideal if the first sidewall 31 were tangent to the inner wall of the first side plate 15. This would allow the electrode assembly 20 to smoothly transition from the inner wall of the first side plate 15 to the first sidewall 31 without being subjected to concentrated stress. However, because the support frame 30 has thickness, this ideal situation is difficult to achieve. Therefore, in order to make the transition between the inner wall of the first side plate 15 and the first side wall 31 as close to tangent as possible, and to minimize the compression of the electrode assembly 20 by the step formed by the end side wall 33 on the inner wall of the first side plate 15, in this battery cell 100, the distance between the end side wall 33 and the center of the arc surface 21 is extended as much as possible along the length direction of the battery cell 100, so that the inner wall of the first side plate 15 and the first side wall 31 are close to tangent, that is, the height of the step formed by the end side wall 33 on the inner wall of the first side plate 15 is minimized. However, due to the limitation of the size of the electrode assembly 20 itself, and considering the high energy density of the battery cell 100, the distance between the end side wall 33 and the center of the adjacent arc surface 21 along the length direction of the battery cell 100 is L, and the value of L is less than or equal to 10 mm, that is, 0 mm < L ≤ 10 mm. This achieves the effect of reducing the compression of the electrode assembly 20 by the step formed by the end side wall 33 on the inner wall of the first side plate 15. The distance between the end sidewall 33 and the center of its adjacent arc surface 21 is affected by the size of the arc surface 21, the thickness of the electrode assembly 20, and the length of the electrode assembly 20. For example, when the electrode assembly 20 is thick enough, the distance L is smaller, and vice versa. Since the length of the electrode assembly 20 is limited, the distance L cannot be increased indefinitely. Therefore, L≤10mm is a more suitable range of values ​​under the condition of considering the high energy density of the battery cell 100.

[0090] In some embodiments of this application, in order to minimize the pressure exerted on the electrode assembly 20 by the step formed on the inner wall of the first side plate 15 by the end sidewall 33, such as... Figure 11 As shown, the inner wall of the first side plate 15 is provided with a stepped structure 17, and the support frame 30 also includes two end side walls 33. The two sides of the end side walls 33 are respectively connected to the first side wall 31 and the second side wall 32. The end side walls 33 abut against the stepped structure 17, and the inner wall of the first side plate 15 is flush with the junction of the first side wall 31 and the end side walls 33. That is to say, in this embodiment, the edge region of the first side wall 31 is flush with the inner wall of the first side plate 15, so that the electrode assembly 20 will not be subjected to concentrated stress compression when it abuts against the inner wall of the first side plate 15 and transitions to the first side wall 31.

[0091] In the battery cell 100 provided in the embodiments of this application, such as Figure 6 As shown, along the height direction of the accommodating space 12, the height H2 of the support frame 30 is less than or equal to the height H1 of the electrode assembly 20. Thus, while the support frame 30 supports and constrains the arcuate surface 21 of the electrode assembly 20, the height of the support frame 30 does not exceed the top of the electrode assembly 20. When the end cap assembly 18 of the housing 10 is closed onto the open end of the main housing 11, the end cap assembly 18 will not interfere with the support frame 30, ensuring that the end cap assembly 18 can be accurately and stably closed onto the open end of the main housing 11. In the embodiments of this application, the ratio of the height H2 of the support frame 30 to the height H1 of the electrode assembly 20 is preferably in the range of 0.9-1.0, i.e., 0.9 ≤ H2 / H1 ≤ 1.0.

[0092] In the battery cell 100 of the embodiments of this application, such as Figures 1 to 3 , Figures 12 to 14As shown, the end cap assembly 18 includes a cap body 181 and an electrode post structure 182 and a pressure relief mechanism 183 disposed on the cap body 181. The electrode post structure 182 is electrically connected to the tabs 22 of the electrode assembly 20, and the electrode post structure 182 serves as the electrode terminal of the battery cell 100, connecting in series, parallel, or mixed with other battery cells 100. The pressure relief mechanism 183 is an element or component that is actuated to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold. "Actuation" means that the pressure relief mechanism 183 performs an action, thereby releasing the internal pressure and temperature of the battery cell 100. The action performed by the pressure relief mechanism 183 may include, but is not limited to, at least a portion of the pressure relief mechanism 183 rupturing, tearing, or melting, etc. After the pressure relief mechanism 183 is actuated, the high-temperature flue gas inside the battery cell 100 will be discharged outward from the pressure relief mechanism 183. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold may depend on one or more of the materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 100. The pressure relief mechanism 183 may employ elements or components that are sensitive to pressure or temperature, i.e., when the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief mechanism 183 is actuated to form a channel for releasing internal pressure.

[0093] like Figure 12 As shown, in some embodiments of this application, the main shell 11 and multiple support frames 30 are configured as an integral modular component. In this embodiment, the integral main shell 11 and multiple support frames 30 can be manufactured using a casting process (or injection molding process), in which case the main shell 11 and support frames 30 are integral metal (or plastic) components. Alternatively, the main shell 11 and multiple support frames 30, which are manufactured separately, can be hot-melted or glued together to assemble the two components into an integral modular component (i.e., an overall structure). Thus, during the assembly and production of the battery cell 100, the electrode assembly 20 is directly assembled into the receiving space 12, and the support frame 30 provides support and constraint to the arc-shaped surface 21 of the electrode assembly 20, reducing the step of separately assembling the support frame 30, simplifying the production process, and improving assembly production efficiency.

[0094] In some embodiments of this application, such as Figures 3 to 7 , Figures 11 to 14 As shown, the battery cell 100 also includes an insulating film 40, which circumferentially surrounds the electrode assembly 20 and the support frame 30, and is attached to the circumferential inner wall of the receiving space 12. Thus, not only is the electrode assembly 20 insulated from the support frame 30, but the support frame 30 is also insulated from the inner wall of the main housing 11 by the insulating film 40, thereby further reducing the possibility of a short circuit between the electrode assembly 20 and the housing 10, ensuring the electrical performance of the battery cell 100.

[0095] like Figures 13 to 16 As shown, in some embodiments of this application, the insulating film 40 and multiple support frames 30 are configured as an integral modular component. In this embodiment, the integral insulating film 40 and multiple support frames 30 can be manufactured using injection molding, in which case the insulating film 40 and support frames 30 are integral plastic components. Alternatively, the separately manufactured insulating film 40 and multiple support frames 30 can be hot-melted or glued together to assemble the two components into an integral modular component (i.e., an overall structure). Thus, during the assembly and production of the battery cell 100, the electrode assembly 20 is directly assembled into the cavity formed by the insulating film 40, and then the entire assembly is placed into the receiving space 12. The support frames 30 then support and constrain the arc-shaped surface 21 of the electrode assembly 20, reducing the steps of separately assembling the support frames 30 and wrapping the insulating film 40 to enclose the electrode assembly 20, further simplifying the production process and improving assembly efficiency.

[0096] In some embodiments of this application, such as Figure 3 , Figure 6 , Figure 12 , Figure 13 and Figure 15 As shown, the battery cell 100 also includes an insulating tray 50, which is attached to the inner wall of the receiving space 12. The electrode assembly 20, the support frame 30, and the insulating film 40 are all disposed on the insulating tray 50, and the insulating film 40 is sealed to the insulating tray 50. By providing the insulating tray 50 located at the bottom of the receiving space 12, and by all disposing of the electrode assembly 20, the support frame 30, and the insulating film 40 on the insulating tray 50, the possibility of interference or short circuit between the electrode assembly 20 and the housing 10 is further reduced, thereby ensuring the electrical performance of the battery cell 100. Furthermore, the sealed arrangement between the insulating film 40 and the insulating tray 50 reduces the possibility of electrolyte leakage within the battery cell 100, which helps to extend the service life of the battery cell 100.

[0097] like Figure 14 and Figure 15As shown, in some embodiments of this application, the insulating tray 50, the insulating film 40, and the multiple support frames 30 are configured as an integral modular component. In this embodiment, the integral insulating tray 50, insulating film 40, and multiple support frames 30 can be manufactured using injection molding, in which case the insulating tray 50, insulating film 40, and support frames 30 are integral plastic components. Alternatively, in this embodiment, the separately manufactured insulating tray 50, insulating film 40, and multiple support frames 30 can be hot-melted or glued together to assemble these three components into an integral modular component (i.e., an overall structure). In this way, during the assembly and production of the battery cell 100, the electrode assembly 20 is directly assembled into the cavity formed by the insulating film 40, and the bottom end of the electrode assembly 20 abuts against the insulating tray 50. Then, the whole assembly is assembled into the receiving space 12. The support frame 30 supports and constrains the arc-shaped surface 21 of the electrode assembly 20 in place. This reduces the steps of assembling the support frame 30 separately, wrapping the insulating film 40 to wrap the electrode assembly 20, and placing the insulating tray 50 into the receiving space 12 separately. This further simplifies the production process and improves assembly production efficiency.

[0098] According to a second aspect of the embodiments of this application, embodiments of this application also provide a battery device 200, such as... Figure 17 As shown, the battery device 200 includes a main body 201, a cover 202, and multiple battery cells 100 as described above. The cover 202 closes onto the open end of the main body 201, forming an assembly space 203. Multiple battery cells 100 are arrayed and assembled within the assembly space 203. The battery cells 100 are used for storing electrical energy or supplying power.

[0099] According to a third aspect of the embodiments of this application, embodiments of this application also provide an energy storage device 300. In some embodiments of this application, 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 mixed, such that these battery devices 200 are used to store electrical energy or provide electrical energy. In other embodiments of this application, the energy storage device 300 includes multiple battery cells 100 as described above, that is, the energy storage device 300 uses multiple battery cells 100 connected in series, parallel, or mixed, such that these battery cells 100 are used to store electrical energy or provide electrical energy.

[0100] The 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. The 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. The 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. The energy storage device 300 can store electrical energy as needed and output it when appropriate. For example, the 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.

[0101] like Figure 18 As 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.

[0102] In some embodiments of this application, 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] According to a fourth aspect of the embodiments of this application, embodiments of this application also provide an electrical appliance 400, which includes an electrical load 410.

[0109] 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.

[0110] In some embodiments of this application, the electrical device 400 further includes an energy storage device 300 as described above. That is, the electrical device 400 employs one energy storage device 300 or multiple energy storage devices 300 connected in series, parallel, or in a mixed configuration, and the electrical load 410 is electrically connected to the energy storage device 300. The battery device 200 of the energy storage device 300 is used to store electrical energy, or the battery device 200 of the energy storage device 300 is used to provide electrical energy to the electrical load 410, thereby enabling the electrical load 410 to operate normally.

[0111] Alternatively, in some other embodiments of this application, the electrical device 400 further includes a battery device 200 as described above. That is, the electrical device 400 uses one battery device 200 or multiple battery devices 200 connected in series, parallel, or mixed connection, and the electrical load 410 is electrically connected to the battery device 200. The battery device 200 is used to store electrical energy, or the battery device 200 is used to provide electrical energy to the electrical load 410, thereby enabling the electrical load 410 to operate normally.

[0112] Alternatively, in some other embodiments of this application, the electrical device 400 further includes 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 in a mixed configuration, and the electrical load 410 is electrically connected to the plurality of battery cells 100. The plurality of battery cells 100 are used to store electrical energy, or the plurality of battery cells 100 are used to provide electrical energy to the electrical load 410, thereby enabling the electrical load 410 to operate normally.

[0113] Among them, the electrical equipment 400 is an electric vehicle, and it is assembled using a battery device 200, such as Figure 19 As shown, the battery device 200 is mounted on the frame 430 of an electric vehicle. The electric vehicle includes the frame 430, a drive motor, and wheels 440. The battery device 200 and the drive motor are both fixedly mounted on the frame 430, and the wheels 440 are rotatably connected to the frame 430. The battery device 200 is electrically connected to the drive motor, and the drive motor is driven by the wheels 440. Using the battery device 200 provided in this application as the drive motor (the drive motor is one of the electrical loads 410 of the electrical equipment 400), the drive motor drives the wheels 440 to rotate, enabling the electric vehicle to drive normally. Furthermore, the electric vehicle includes a control device 420, which is mounted on the frame 430 and electrically connected to the battery device 200. The control device 420 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.

[0114] 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 by, include: The housing has a receiving space, the inner wall of which includes a plurality of circumferentially spaced corner portions. The housing includes a bottom plate, two first side plates and two second side plates. The two first side plates and the two second side plates are alternately connected to the bottom plate end to end to enclose and form a square receiving space. The corner portions are formed at the junction of adjacent first side plates and second side plates. At least one electrode assembly is housed in the housing space, the circumferential surface of the electrode assembly comprising a plurality of circumferentially spaced arcuate surfaces, each of the corners being opposite at least a portion of one of the arcuate surfaces; Multiple support frames, each support frame including a first sidewall and a second sidewall facing away from each other, the first sidewall including at least one arcuate portion, the arcuate portion being adapted to and in insulating contact with the arcuate surface, the second sidewall contacting the inner wall, and the second sidewall contacting at least the corresponding corner portion.

2. The battery cell according to claim 1, characterized in that, The second sidewall also contacts the inner wall of the first side plate and / or the second side plate.

3. The battery cell according to claim 1, characterized in that, The multiple support frames are arranged in a one-to-one correspondence with the multiple arc-shaped surfaces.

4. The battery cell according to claim 1, characterized in that, The battery cell includes an electrode assembly, and the electrode assembly has multiple arc-shaped surfaces that correspond one-to-one with multiple corner portions. Furthermore, a support frame is provided between each corner portion and the corresponding arc-shaped surface.

5. The battery cell according to claim 2, characterized in that, One electrode assembly corresponds to two oppositely arranged support frames. The first sidewall of each support frame is provided with two arc-shaped portions, and the two arc-shaped portions correspond one-to-one with two adjacent arc-shaped surfaces.

6. The battery cell according to claim 5, characterized in that, The battery cell includes one electrode assembly. The second sidewall of each support frame includes a first flat wall, a second flat wall, and a third flat wall connected in sequence. The inner wall of the first side plate is parallel to the length direction of the accommodating space, and the inner wall of the second side plate is parallel to the width direction of the accommodating space. The first flat wall and the third flat wall are in contact with the inner walls of the two first side plates, respectively, and the second flat wall is in contact with the inner wall of the second side plate.

7. The battery cell according to claim 5, characterized in that, The battery cell includes a plurality of electrode assemblies, which are stacked along the width of the accommodating space. The second sidewall of each of the support frames includes a first flat wall, a second flat wall and a third flat wall that are connected in sequence. In two adjacent support frames, the first flat wall of one support frame is in contact with the third flat wall of the other support frame. In the plurality of support frames located on the same side of the plurality of electrode assemblies, the plurality of second flat walls are in contact with the inner wall of the corresponding second side plate; In the two support frames located at both ends in the stacking direction of the electrode assembly, the first flat wall of one support frame and the third flat wall of the other support frame respectively contact the inner wall of the corresponding first side plate.

8. The battery cell according to claim 2, characterized in that, The battery cell includes multiple electrode assemblies and two support frames. The multiple electrode assemblies are stacked along the width direction of the accommodating space. The second sidewall of each support frame includes a first flat wall, a second flat wall, and a third flat wall connected in sequence. The inner wall of the first sidewall is parallel to the length direction of the accommodating space, and the inner wall of the second sidewall is parallel to the width direction of the accommodating space. The second flat walls of the two support frames respectively contact the inner walls of the two second sidewalls. The first flat walls and the third flat walls of the two support frames respectively contact the inner walls of the two first sidewalls. Furthermore, the first sidewall of each support frame is provided with multiple arc-shaped portions arranged along the width direction, and the multiple arc-shaped portions contact the multiple arc-shaped surfaces one by one.

9. The battery cell according to claim 8, characterized in that, A circular arc transition occurs between the two arcuate portions corresponding to the two adjacent arcuate surfaces of the two adjacent electrode assemblies.

10. The battery cell according to any one of claims 2-9, characterized in that, The support frame also includes end sidewalls, with the two sides of the end sidewalls respectively connected to the first sidewall and the second sidewall. Along the length direction of the battery cell, the distance between the end sidewall and the center of the adjacent arc-shaped surface is less than or equal to 10 mm.

11. The battery cell according to any one of claims 2-9, characterized in that, The inner wall of the first side plate is provided with a stepped structure, and the support frame also includes two end side walls. The two sides of the end side walls are respectively connected to the first side wall and the second side wall. The end side walls abut against the stepped structure, and the inner wall of the first side plate is flush with the junction of the first side wall and the end side walls.

12. The battery cell according to any one of claims 1-9, characterized in that, Along the height direction of the accommodating space, the height of the support frame is less than or equal to the height of the electrode assembly.

13. The battery cell according to any one of claims 1-9, characterized in that, The housing and the plurality of support frames are configured as a single modular component.

14. The battery cell according to any one of claims 1-9, characterized in that, The battery cell also includes an insulating film that circumferentially surrounds the electrode assembly and the support frame, and the insulating film is attached to the circumferential inner wall of the receiving space.

15. The battery cell according to claim 14, characterized in that, The insulating film and the plurality of support frames are integrated into a modular component.

16. The battery cell according to claim 14, characterized in that, The battery cell also includes an insulating tray, which is attached to the inner wall of the receiving space. The electrode assembly, the support frame, and the insulating film are all disposed on the insulating tray, and the insulating film and the insulating tray are sealed together.

17. The battery cell according to claim 16, characterized in that, The insulating tray, the insulating film, and the multiple support frames are integrated into a modular component.

18. A battery device characterized by comprising: Includes a battery cell as described in any one of claims 1-17, the battery cell being used to store or provide electrical energy.

19. An energy storage device, characterized in that, The energy storage device includes a battery cell as described in any one of claims 1-17, the battery cell being used to store or provide electrical energy; Alternatively, the energy storage device may include the battery device as described in claim 18, the battery device being used to store or provide electrical energy.

20. An electrical device, comprising: Including electrical loads; The electrical equipment further includes a plurality of battery cells as described in any one of claims 1-17, 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 18, 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 19, wherein the electrical load is electrically connected to the energy storage device; The battery cell is used to store or provide electrical energy.

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