Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery cell includes a case, an electrode assembly, and an insulator. Wherein the electrode assembly is arranged in the shell. The insulating part is located in the shell and comprises a bottom wall, two first side walls and two second side walls, the two first side walls are arranged at intervals in the first direction and connected with the bottom wall, the two second side walls are arranged at intervals in the second direction, and the first direction and the second direction form an included angle and are parallel to the bottom wall; the two first side walls are connected with the two second side walls respectively, the bottom wall, the first side walls and the second side walls jointly define a containing cavity, the electrode assembly is located in the containing cavity, and a notch is formed in the bottom of the containing cavity. The bottom of the accommodating cavity is provided with the gap, so that the area of the bottom wall is smaller, the material consumption is reduced, the mass energy density of the battery monomer is also improved, and the gap can enable the electrolyte to flow into the bottom of the shell, so that the shell can be filled with more electrolyte, and the infiltration effect of the electrode assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] When the electrode assembly of the battery cell is installed in the housing, the electrode assembly needs to be insulated by an insulating film. The problem is that the insulating film uses more materials to wrap the electrode assembly, resulting in a low mass energy density of the battery cell. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can save the material usage of the insulating component by improving the insulating component.

[0004] In the first aspect, the present application provides a battery cell, including a shell, an electrode assembly and an insulating member. The electrode assembly is arranged in the shell. The insulating member is located in the shell, and the insulating member includes a bottom wall, two first side walls and two second side walls, the two first side walls are arranged at intervals along a first direction and connected to the bottom wall, the two second side walls are arranged at intervals along a second direction, the first direction and the second direction are arranged at an angle and are parallel to the bottom wall, the two first side walls are respectively connected to the two second side walls, the bottom wall, the first side wall and the second side wall jointly define a accommodating cavity, the electrode assembly is located in the accommodating cavity, and a notch is provided at the bottom of the accommodating cavity.

[0005] When the insulating part wraps the electrode assembly, a notch is provided at the bottom of the accommodating cavity. On the one hand, the area of ​​the bottom wall wrapping the bottom surface of the electrode assembly is reduced, so that the area of ​​the bottom wall can be smaller, saving material usage, and reducing the overall mass of the insulating part, thereby improving the mass energy density of the battery cell. On the other hand, the notch allows the electrolyte to flow into the bottom of the shell, so that more electrolyte can be filled in the shell to improve the wetting effect of the electrode assembly.

[0006] In some embodiments, the battery cell further includes an insulating bottom support plate, which is located on one side of the bottom wall along the thickness direction of the bottom wall. The arrangement of the bottom support plate can support the electrode assembly and also increase the distance between the bottom of the electrode assembly and the shell, so as to reduce the probability of metal debris inside the shell entering the electrode assembly and causing a short circuit.

[0007] In some embodiments, the bottom support plate is formed with a through hole that penetrates along the thickness direction of the bottom wall, the bottom support plate completely covers the gap, the bottom wall completely covers the through hole, and a matching gap is formed between the bottom wall and the bottom support plate. Compared with a structure in which the bottom support plate is not provided with a through hole, the through hole is provided in the bottom support plate, which can reduce the material consumption of the bottom support plate to improve the mass capacity density of the battery cell; at the same time, when the bottom support plate is in contact with the bottom wall, due to the matching gap, the electrolyte can flow into the bottom of the shell, so that more electrolyte can be filled in the shell to improve the wetting effect of the electrode assembly.

[0008] In some embodiments, the minimum distance between the inner wall of the through hole and the edges of the bottom support plate is greater than 1 mm. Thus, the inner wall of the through hole can have a certain strength at the thinnest position of the edges of the bottom support plate to reduce the deformation of the through hole during the installation and use of the bottom support plate, so that the bottom plate can completely cover the through hole to increase the isolation area of ​​the electrode assembly, thereby improving the insulation effect of the electrode assembly.

[0009] In some embodiments, the bottom support plate is located between the inner bottom surface and the bottom wall of the housing. Compared with the structure in which the bottom support plate is located between the electrode assembly and the bottom wall, the size of the bottom support plate is not limited by the accommodation space of the insulating member, and the bottom support plate can be made larger than the bottom area of ​​the accommodation space to increase the support area for better supporting the electrode assembly.

[0010] In some embodiments, two first folds are formed between the two first side walls and the bottom wall, the interval between the two first folds is d, and the dimension of the bottom support plate along the first direction is width d3, wherein d3≥d. d3≥d can make the bottom support plate have enough area to support the electrode assembly.

[0011] In some embodiments, the length of the bottom support plate along the second direction is D1, and the distance between the inner surfaces of the two second side walls is D, wherein |D1-D|<10 mm. Thus, the bottom support plate can better match the size of the electrode assembly when combined with the insulating member, so that the bottom support plate can better support the electrode assembly, and the insulating member can better wrap the electrode assembly.

[0012] In some embodiments, a notch is formed on at least one side of the bottom wall along the second direction. A U-shaped notch can be cut on the insulating sheet, which is then folded to wrap the electrode assembly. The notch is formed on at least one side of the bottom wall to facilitate cutting before folding the insulating piece, and lower materials can be cut off.

[0013] In some embodiments, the edge of the bottom wall, the first side wall and the second side wall together define a gap, thereby further reducing the amount of material used in the insulating member.

[0014] In some embodiments, each second side wall includes two side panels, and the two side panels are connected to the two first side walls in a one-to-one correspondence, and at least part of the two side panels overlap. The side panels and the first side panels can be bent 90° by folding, and the two side panels are connected together and have overlapping parts, which can facilitate wrapping the electrode assembly.

[0015] In some embodiments, the distance from any point on the edge of each side wall away from the bottom wall to the bottom wall is L1, and the distance from the edge of the first side plate away from the bottom wall to the bottom wall is L2, where L1<L2. When the angle between the two first side walls and the bottom wall is greater than 90°, the two side plates will bend upward, causing the two side plates to exceed the range of the electrode assembly, while L1<L2, with the same angle between the two first side walls and the bottom wall, the maximum distance between the two side plates and the bottom wall is smaller than L1 greater than or equal to L2, and it is less likely to cause the side plates to exceed the range of the electrode assembly; at the same time, compared with the structure of L1=L2, the material consumption of the insulating parts can be further saved, and the mass energy density of the battery cell can be improved.

[0016] In some embodiments, the edge of the side wall facing away from the bottom wall is arranged at an angle with the edge of the first side plate facing away from the bottom wall. When the angle between the two first side walls and the bottom wall is greater than 90°, the lower positions of the edges of the two side plates facing away from the bottom wall can be tilted upward, making it less likely that the two side plates will exceed the range of the electrode assembly.

[0017] In some embodiments, the second side wall includes a connecting plate and a folding plate, each first side wall is connected to the second side wall via the folding plate, and the folding plate overlaps one side of the connecting plate along the second direction. The insulating member can be formed by folding a plate member, that is, when the insulating member is in an unfolded state, after the overlapping portion of the folding plate is unfolded 180°, the two folded edges of the folding plate are connected to the first side wall and the connecting plate in a one-to-one correspondence, and it is only necessary to cut a notch at a corresponding position of the bottom wall of the insulating member, which can reduce the cutting amount of the insulating member.

[0018] In some embodiments, the distance from the edge of the connecting plate on the side facing away from the bottom wall to the bottom wall is h, and the distance from the edge of the first side wall on the side facing away from the bottom wall to the bottom wall is H1, where h

[0019] In some embodiments, each first side wall is formed with a positioning hole. A positioning fixture can be used to position and fold the folded insulating sheet to improve the folding accuracy of the insulating sheet.

[0020] ​In a second aspect, the present application provides a battery, comprising the battery cell of the first aspect.

[0021] Since the battery includes the technical features of the battery cell of the first aspect, the effects are the same as those described above and will not be described in detail here.

[0022] In a third aspect, the present application provides an electrical device, comprising the battery of the second aspect, wherein the battery is used to provide electrical energy to the electrical device.

[0023] Since the electrical device includes the technical features of the battery of the second aspect, the effects are the same as those described above and will not be described in detail here.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0027] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0028] Figure 3 An exploded view of a battery cell provided in one embodiment of the present application;

[0029] Figure 4 An exploded view of a battery cell provided in yet another embodiment of the present application;

[0030] Figure 5 An isometric view of an insulating member of a battery cell provided in some embodiments of the present application;

[0031] Figure 6 A bottom view of an insulating member of a battery cell provided in some embodiments of the present application;

[0032] Figure 7 An axonometric view of an insulating member of a battery cell during the unfolding process provided by some embodiments of the present application;

[0033] Figure 8An expanded view of an insulating member of a battery cell provided in the first embodiment of the present application;

[0034] Fig. 9 An expanded view of an insulating member of a battery cell provided in a second embodiment of the present application;

[0035] Fig.10 An expanded view of an insulating member of a battery cell provided in a third embodiment of the present application;

[0036] Fig.11 A view showing the positions of the insulating member and the bottom support plate of a battery cell provided in some embodiments of the present application when the insulating member is in an unfolded state;

[0037] Fig.12 A top view of a bottom support plate in a battery cell provided in some embodiments of the present application.

[0038] The reference numerals in the specific implementation manner are as follows:

[0039] 1000. Vehicles;

[0040] 100. Battery;

[0041] 200, controller;

[0042] 300, motor;

[0043] 10. Box body; 11. Lower box body; 12. Upper cover;

[0044] 20. Battery cell; 21. Top cover assembly; 211. Electrode terminal; 22. Shell; 23. Electrode assembly; 231. Positive electrode ear; 232. Negative electrode ear;

[0045] 24, insulating member; 241, bottom wall; 242, first side wall; 243, second side wall; 2431, side plate; 2432, connecting plate; 2433, folding plate; 24331, folding crease; 245, accommodating cavity; 246, positioning hole; 247, notch; 2411, first crease; 2412, second crease; 2413, third crease; 2414, fourth crease;

[0046] 25. bottom support plate; 251. through hole;

[0047] A. First direction; B. Second direction. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to include non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, the second direction and / or B may represent: the second direction exists alone, the second direction and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] When the electrode assembly of the battery cell is installed in the shell, the electrode assembly needs to be insulated by an insulating film. In order to improve the insulation effect of the electrode assembly, the insulating film completely wraps the bottom of the electrode assembly. The problem is that the insulating film uses more material to wrap the electrode assembly, resulting in a low mass energy density of the battery cell; at the same time, it will also make it difficult for the electrolyte to flow into the bottom of the shell, affecting the wetting effect of the electrode assembly.

[0057] In view of this, the present application provides a battery cell, in which the electrode assembly is wrapped by an insulating member, and a notch is provided at the bottom of the accommodating cavity. On the one hand, the area of ​​the bottom wall wrapping the bottom surface of the electrode assembly is reduced, saving the material usage of the bottom wall of the insulating member, reducing the overall usage of the insulating member, and reducing the overall mass of the insulating sheet, thereby improving the mass energy density of the battery cell; on the other hand, the notch allows the electrolyte to flow into the bottom of the shell, so that more electrolyte can be filled in the shell to improve the wetting effect of the electrode assembly.

[0058] An embodiment of the present application provides an electrical device, including a battery, and the battery is used to provide electrical energy to the electrical device.

[0059] Electrical devices may include, but are not limited to, electric toys, electric tools, battery vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in some embodiments of the present application.

[0061] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving. In some embodiments of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , Figure 2 The exploded diagram of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and at least one battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a lower box body 11 and an upper cover 12, and the lower box body 11 and the upper cover 12 cover each other, and the lower box body 11 and the upper cover 12 jointly define a storage space for accommodating the battery cell 20. The upper cover 12 can be a hollow structure with an inlet at one end, and the lower box body 11 can be a plate-like structure. The lower box body 11 covers the inlet side of the upper cover 12, so that the lower box body 11 and the upper cover 12 jointly define a storage space; the lower box body 11 and the upper cover 12 can also be hollow structures with an inlet on one side, and the inlet side of the lower box body 11 covers the inlet side of the upper cover 12. Of course, the lower box body 11 formed by the lower box body 11 and the upper cover 12 can be in various shapes, such as T-shape, rectangular parallelepiped, etc.

[0063] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the lower box 11; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the lower box 11. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0064] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0065] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. The battery cell 20 includes a top cover assembly 21, a housing 22, an electrode assembly 23 and other functional components.

[0066] The top cover assembly 21 refers to a component that covers the inlet of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover assembly 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the top cover assembly 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover assembly 21 is not easy to deform when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 211 can be provided on the top cover assembly 21. The electrode terminal 211 can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the top cover assembly 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the top cover assembly 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the top cover assembly 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the top cover assembly 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0067] The shell 22 is a component used to cooperate with the top cover assembly 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the top cover assembly 21 can be independent components, and an inlet can be set on the shell 22, and the top cover assembly 21 covers the inlet to form the internal environment of the battery cell 20. Without limitation, the top cover assembly 21 and the shell 22 can also be integrated. Specifically, the top cover assembly 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the top cover assembly 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0068] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear. The positive pole ear 231 and the negative pole ear 232 may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0069] For the convenience of explanation, please refer to the following examples. Figure 4-Figure 10 , a battery cell 20 according to an embodiment of the present application is taken as an example for description.

[0070] The battery cell 20 includes a shell 22, an electrode assembly 23 and an insulating member 24. The electrode assembly 23 is disposed in the shell 22. The insulating member 24 is located in the shell 22, and the insulating member 24 includes a bottom wall 241, two first side walls 242 and two second side walls 243. The two first side walls 242 are spaced apart along a first direction A and connected to the bottom wall 241, and the two second side walls 243 are spaced apart along a second direction B. The first direction A and the second direction B are arranged at an angle and are parallel to the bottom wall 241. The two first side walls 242 are respectively connected to the two second side walls 243. The bottom wall 241, the first side wall 242 and the second side wall 243 jointly define a receiving cavity 245. The electrode assembly 23 is located in the receiving cavity 245, and a notch 247 is provided at the bottom of the receiving cavity 245.

[0071] Optionally, the notch 247 may be located at the center of the bottom wall 241 , or may be located on at least one side of the bottom wall 241 .

[0072] Optionally, the first direction AA is perpendicular to the second direction BB.

[0073] Optionally, the insulating member 24 may be a polyester member having insulating properties.

[0074] When the insulating part 24 wraps the electrode assembly 23, a notch 247 is provided at the bottom of the accommodating cavity 245. On the one hand, the area of ​​the bottom surface of the bottom wall 241 wrapping the electrode assembly 23 is reduced, so that the area of ​​the bottom wall 241 can be smaller, saving material usage, and reducing the overall mass of the insulating part 24, thereby improving the mass energy density of the battery cell 20. On the other hand, the notch 247 allows the electrolyte to flow into the bottom of the shell 22, so that more electrolyte can be filled in the shell 22 to improve the wetting effect of the electrode assembly 23.

[0075] In some embodiments, please refer to Figure 4 and Fig.11 The battery cell 20 further includes an insulating bottom support plate 25 , and the bottom support plate 25 is located on one side of the bottom wall 241 along the thickness direction of the bottom wall 241 .

[0076] The thickness direction of the bottom wall 241 is Figure 4 The C direction.

[0077] Optionally, the material of the bottom support plate 25 may be insulating plastic.

[0078] The bottom support plate 25 can provide support for the electrode assembly 23 and also increase the distance between the bottom of the electrode assembly 23 and the shell 22 to reduce the probability of metal debris inside the shell 22 entering the electrode assembly 23 and causing a short circuit.

[0079] In some embodiments, please refer to Figure 4 , Fig.11 and Fig.12 The bottom supporting plate 25 is formed with a through hole 251 that penetrates along the thickness direction of the bottom wall 241 . The bottom supporting plate 25 completely covers the notch 247 . The bottom wall 241 completely covers the through hole 251 , and a fitting gap is formed between the bottom wall 241 and the bottom supporting plate 25 .

[0080] The through hole 251 includes but is not limited to a circular hole, a square hole or a polygonal hole.

[0081] The thickness direction of the bottom wall 241 is the C direction in the figure.

[0082] Optionally, the through hole 251 is located at the center of the bottom supporting plate 25 , and a notch 247 is provided on one or both sides of the bottom wall 241 along the second direction B.

[0083] The through hole 251 is set on the bottom support plate 25. Compared with the structure in which the through hole 251 is not set on the bottom support plate 25, the material consumption of the bottom support plate 25 can be reduced to improve the mass capacity density of the battery cell 20; at the same time, when the bottom support plate 25 is in contact with the bottom wall 241, due to the fitting gap, the electrolyte can flow into the bottom of the shell 22, so that more electrolyte can be filled in the shell 22 to improve the wetting effect of the electrode assembly 23.

[0084] In some embodiments, please refer to Fig.12 , the minimum distance between the inner wall of the through hole 251 and the edges of the bottom support plate 25 is greater than 1 mm. Thus, the inner wall of the through hole 251 can have a certain strength at the thinnest position of the edges of the bottom support plate 25 to reduce the deformation of the through hole 251 during the installation and use of the bottom support plate 25, so that the bottom plate can completely cover the through hole 251, and the bottom support plate 25 can be set as an insulating plate to increase the isolation area of ​​the electrode assembly 23, thereby improving the insulation effect on the electrode assembly 23.

[0085] In some embodiments, please refer to Figure 4 The bottom support plate 25 is located between the inner bottom surface of the shell 22 and the bottom wall 241. Compared with the structure in which the bottom support plate 25 is located between the electrode assembly 23 and the bottom wall 241, the size of the bottom support plate 25 is not limited by the accommodation space of the insulating member 24, and the bottom support plate 25 can be made larger than the bottom area of ​​the accommodation space to increase the supporting area to better support the electrode assembly 23.

[0086] In some embodiments, please refer to Figure 8 Two first folds 2411 are formed between the two first side walls 242 and the bottom wall 241, and the distance between the two first folds 2411 is d. The dimension of the bottom support plate 25 along the first direction A is a width d3, wherein d3≥d. d3≥d can make the bottom support plate 25 have a sufficient area to support the electrode assembly 23.

[0087] In some embodiments, please refer to Figure 6 and Fig.12 , the length of the bottom support plate 25 along the second direction B is D1, and the distance between the inner surfaces of the two second side walls 243 is D, wherein |D1-D| is less than 10 mm. Thus, the bottom support plate 25 and the insulating member 24 can better match the size of the electrode assembly 23 when combined, so that the bottom support plate 25 can better support the electrode assembly 23, and the insulating member 24 can better wrap the electrode assembly 23.

[0088] In some embodiments, please refer to Figure 6The bottom wall 241 is provided with a notch 247 on at least one side along the second direction B. The U-shaped notch 247 can be cut on the insulating sheet, and then folded to wrap the electrode assembly 23. The notch 247 is formed on at least one side of the bottom wall 241, which facilitates cutting of the insulating member 24 before folding, and can cut off the lower material.

[0089] In some embodiments, please refer to Figure 6 The edge of the bottom wall 241, the first side wall 242 and the second side wall 243 together define a notch 247. Thus, the amount of material used for the insulating member 24 can be further reduced.

[0090] In some embodiments, please refer to Figure 5-Figure 9 Each second side wall 243 includes two side panels 2431 , and the two side panels 2431 are connected to the two first side walls 242 in a one-to-one correspondence, and at least parts of the two side panels 2431 overlap.

[0091] Optional, Figure 8 and Fig. 9 As shown, after the insulating member 24 is unfolded, a first fold 2411 is formed between the first side wall 242 and the bottom wall 241, and a second fold 2412 is formed between the side plate 2431 and the first side wall 242. There are four second folds 2412 in the figure, wherein two second folds 2412 on at least one side along the second direction B are spaced from the bottom wall 241. When folded, the two first side walls 242 are folded toward the same direction by approximately 90°, and the side plate 2431 is bent toward one side of the bottom wall 241 by approximately 90° relative to the first side wall 242 along the second fold 2412 to form a receiving space. Fig. 9 After the structure is folded, a notch 247 is formed on one side of the bottom wall 241 along the second direction B. Figure 8 After the structure is folded, notches 247 are formed on both sides of the bottom wall 241 along the second direction B. The notch 247 can also be set at the center of the bottom plate, that is, the bottom wall 241 is a ring structure.

[0092] Thus, the side plate 2431 and the first side plate 2431 can be bent 90° by folding, and the two side plates 2431 are connected together and have overlapping parts, which can facilitate wrapping the electrode assembly 23.

[0093] In some embodiments, please refer to Figure 8 The distance between any point on the edge of each side wall away from the bottom wall 241 and the bottom wall 241 is L1, and the distance between the edge of the first side plate 2431 away from the bottom wall 241 and the bottom wall 241 is L2, wherein L1<L2.

[0094] When the edge of the side wall away from the bottom wall 241 has a first intersection with the edge of the first side plate 2431 away from the bottom wall 241, the distance from any point on the edge of each side wall away from the bottom wall 241 to the bottom wall 241 does not include the distance from the first intersection to the bottom wall 241.

[0095] When the angle between the two first side walls 242 and the bottom wall 241 is greater than 90°, the two side plates 2431 will warp upward, causing the two side plates 2431 to exceed the range of the electrode assembly 23. L1<L2, when the two first side walls 242 are bent at the same angle relative to the bottom wall 241, the maximum distance between the two side plates 2431 and the bottom wall 241 is smaller than L1 greater than or equal to L2, making it less likely for the side plates 2431 to exceed the range of the electrode assembly 23. At the same time, compared with the structure of L1=L2, the material usage of the insulating member 24 can be further saved, and the mass energy density of the battery cell 20 can be improved.

[0096] In some embodiments, please refer to Figure 8 , the edge of the side wall away from the bottom wall 241 and the edge of the first side plate 2431 away from the bottom wall 241 are set at an angle. When the angle between the two first side walls 242 and the bottom wall 241 is greater than 90°, the lower positions of the edges of the two side plates 2431 away from the bottom wall 241 can be tilted upward, making it less likely for the two side plates 2431 to exceed the range of the electrode assembly 23.

[0097] In some embodiments, please refer to Fig.10 The second side wall 243 includes a connecting plate 2432 and a folding plate 2433 , each first side wall 242 is connected to the second side wall 243 via the folding plate 2433 , and the folding plate 2433 overlaps one side of the connecting plate 2432 along the second direction B.

[0098] Fig.10 FIG. 2 shows a structural diagram of the insulating member 24 after it is unfolded. Fig.10 In the embodiment, the insulating member 24 is generally in an octagonal structure, and the folding plate 2433 is in a triangular structure after being unfolded. A folding crease 24331 is formed after the folding plate 2433 is unfolded. A third crease 2413 is formed at the position where the folding plate 2433 is connected to the first side wall 242, and a fourth crease 2414 is formed at the position where the folding plate 2433 is connected to the connecting plate 2432. The third crease 2413 and the fourth crease 2414 intersect at a substantially 90° angle, and the folding crease 24331 is substantially located on the angle bisector of the third crease 2413 and the third crease 2413. After the folding plate 2433 is folded approximately 180° at the folding crease 24331, the third crease 2413 and the fourth crease 2414 are substantially overlapped, and the two parts of the folding plate 2433 are substantially overlapped together and overlapped with a part of the connecting plate 2432. Fig.10 As shown in FIG. 2 , notches 247 are provided on both sides of the bottom wall 241 along the second direction B.

[0099] The insulating member 24 can be formed by folding a plate, that is, when the insulating member 24 is in an unfolded state, after the overlapping part of the folding plate 2433 is unfolded 180°, the two folded edges of the folding plate 2433 are connected to the first side wall 242 and the connecting plate 2432 one by one, and it is only necessary to cut out a notch 247 at the corresponding position of the bottom wall 241 of the insulating member 24, thereby reducing the cutting amount of the insulating member 24.

[0100] In some embodiments, please refer to Fig.10 , the distance from the edge of the connecting plate 2432 on the side away from the bottom wall 241 to the bottom wall 241 is h, and the distance from the edge of the first side wall 242 on the side away from the bottom wall 241 to the bottom wall 241 is H1, where h

[0101] In some embodiments, please refer to Figure 5 and Fig. 9 Each first side wall 242 is formed with a positioning hole 246. A positioning fixture can be used to position and fold the folded insulating sheet to improve the folding accuracy of the insulating sheet.

[0102] In a first alternative embodiment of the battery cell 20, please refer to Figure 4-Figure 6 , Fig.12 ​The battery cell 20 includes a shell 22, an insulating bottom support plate 25, an electrode assembly 23 and an insulating member 24. The electrode assembly 23 is arranged in the shell 22. The insulating member 24 is located in the shell 22. The insulating member 24 includes a bottom wall 241, two first side walls 242 and two second side walls 243. The two first side walls 242 are arranged at intervals along the first direction A and connected to the bottom wall 241. The two second side walls 243 are arranged at intervals along the second direction B. The first direction A and the second direction B are arranged at an angle and are parallel to the bottom wall 241. The two first side walls 242 are respectively connected to the two second side walls 243. The bottom wall 241, the first side wall 242 and the second side wall 243 jointly define a receiving cavity 245. The electrode assembly 23 is located in the receiving cavity 245. The bottom wall 241 is provided with notches 247 on both sides of the second direction B. The bottom support plate 25 is located between the inner bottom surface of the shell 22 and the bottom wall 241. The bottom support plate 25 is formed with a through hole 251 that penetrates along the thickness direction of the bottom wall 241. The bottom support plate 25 completely covers the notch 247, the bottom wall 241 completely covers the through hole 251, and a matching gap is formed between the bottom wall 241 and the bottom support plate 25. The minimum distance between the inner wall of the through hole 251 and the edges of the bottom support plate 25 is greater than 1 mm. Two first folds 2411 are formed between the two first side walls 242 and the bottom wall 241. The spacing between the two first folds 2411 is d, and the dimension of the bottom support plate 25 along the first direction A is a width d3, where d3 ≥ d. The length of the bottom support plate 25 along the second direction B is D1, and the spacing between the inner surfaces of the two second side walls 243 is D, where |D1-D| < 10 mm.

[0103] Notches 247 are provided on both sides of the bottom wall 241 along the second direction B, and through holes 251 are provided on the bottom support plate 25. The bottom support plate 25 covers the notches 247, and the bottom wall 241 covers the through holes 251 to form a complementary structure, which can completely cover the bottom surface of the electrode assembly 23. On the one hand, the insulation effect of the electrode assembly 23 is improved, and the material consumption of the bottom support plate 25 and the bottom wall 241 is reduced; at the same time, the weight of the bottom support plate 25 and the insulating member 24 can be reduced to improve the mass energy density of the battery cell 20; a fitting gap is formed between the bottom wall 241 and the bottom support plate 25, which can improve the electrolyte infiltration effect of the battery cell 20. The minimum distance between the inner wall of the through hole 251 and the edges of the bottom support plate 25 is greater than 1 mm, so that the bottom support plate 25 has sufficient supporting strength and reduces the deformation of the through hole 251, so that the bottom plate can completely cover the through hole 251, so as to increase the isolation area of ​​the electrode assembly 23, thereby improving the insulation effect of the electrode assembly 23, and |D1-D|<10mm can make the bottom support plate 25 and the insulating member 24 better match the size of the electrode assembly 23 when combined, so that the bottom support plate 25 can better support the electrode assembly 23, and the insulating member 24 can better wrap the electrode assembly 23.

[0104] In a second alternative embodiment of the battery cell 20, please refer to Figure 4-Figure 9 , which is different from the first optional embodiment, in that each second side wall 243 includes two side plates 2431, and the two side plates 2431 are connected to the two first side walls 242 in a one-to-one correspondence, and at least part of the two side plates 2431 overlap. The distance between any point on the edge of each side wall away from the bottom wall 241 and the bottom wall 241 is L1, and the distance between the edge of the first side plate 2431 away from the bottom wall 241 and the bottom wall 241 is L2, wherein L1<L2, and the edge of the side wall away from the bottom wall 241 and the edge of the first side plate 2431 away from the bottom wall 241 are arranged at an angle.

[0105] Thus, the insulating part 24 can wrap the electrode assembly 23 by folding. When the angle between the two first side walls 242 and the bottom wall 241 is greater than 90°, the two side plates 2431 will curl up, causing the two side plates 2431 to exceed the range of wrapping the electrode assembly 23. L1<L2, which is the same as the angle between the two first side walls 242 and the bottom wall 241. The maximum distance between the two side plates 2431 and the bottom wall 241 is smaller than L1 greater than or equal to L2, making it less likely for the side plates 2431 to exceed the range of wrapping the electrode assembly 23. At the same time, compared with the structure of L1=L2, the material usage of the insulating part 24 can be further saved, and the mass energy density of the battery cell 20 can be improved.

[0106] In a third alternative embodiment of the battery cell 20, please refer to Figure 4 and Fig.10 , which is different from the first optional embodiment, is that the second side wall 243 includes a connecting plate 2432 and a folding plate 2433, each first side wall 242 is connected to the second side wall 243 via the folding plate 2433, and the folding plate 2433 overlaps one side of the connecting plate 2432 along the second direction B. The distance from the edge of the connecting plate 2432 facing away from the bottom wall 241 to the bottom wall 241 is h, and the distance from the edge of the first side wall 242 facing away from the bottom wall 241 to the bottom wall 241 is H1, where h

[0107] Thus, the insulating part 24 can wrap the electrode assembly 23 by folding. When the insulating part 24 wraps the electrode assembly 23, the height (h) of the connecting plate 2432 is made smaller than the height (width H1) of the first side wall 242, so that when the folding deviation between the first side wall 242 and the bottom wall 241 is greater than 90°, the connecting plate 2432 will not be tilted upward and exceed the range of the second side wall 243 wrapping the electrode assembly 23.

[0108] ​Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: case; An electrode assembly is disposed in the housing; An insulating member is located in the shell, and includes a bottom wall, two first side walls and two second side walls. The two first side walls are spaced apart along a first direction and connected to the bottom wall. The two second side walls are spaced apart along a second direction. The first direction and the second direction are arranged at an angle and are parallel to the bottom wall. The two first side walls are respectively connected to the two second side walls. The bottom wall, the first side wall and the second side wall jointly define a accommodating cavity. The electrode assembly is located in the accommodating cavity, and a notch is provided at the bottom of the accommodating cavity.

2. The battery cell according to claim 1, characterized in that: The battery cell further includes an insulating bottom support plate, which is located at one side of the bottom wall along the thickness direction of the bottom wall.

3. The battery cell according to claim 2, characterized in that: The bottom supporting plate is formed with a through hole penetrating along the thickness direction of the bottom wall, the bottom supporting plate completely covers the notch, the bottom wall completely covers the through hole, and a matching gap is formed between the bottom wall and the bottom supporting plate.

4. The battery cell according to claim 3, characterized in that: The minimum distance between the inner wall of the through hole and the edges of the bottom support plate is greater than 1 mm.

5. The battery cell according to claim 2, characterized in that: The bottom supporting plate is located between the inner bottom surface of the shell and the bottom wall.

6. The battery cell according to claim 5, characterized in that: Two first folds spaced apart are formed between the two first side walls and the bottom wall, the distance between the two first folds is d, and the dimension of the bottom support plate along the first direction is a width d3, wherein d3≥d.

7. The battery cell according to claim 5, characterized in that: The length of the bottom supporting plate along the second direction is D1, and the distance between the inner surfaces of the two second side walls is D, wherein |D1-D|<10 mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The notch is formed on at least one side of the bottom wall along the second direction.

9. The battery cell according to claim 8, characterized in that: The edge of the bottom wall, the first side wall and the second side wall jointly define the notch.

10. The battery cell according to any one of claims 1 to 7, characterized in that: Each of the second side walls includes two side panels, the two side panels are connected to the two first side walls in a one-to-one correspondence, and at least parts of the two side panels overlap.

11. The battery cell according to claim 10, characterized in that: The distance between any point on the edge of each side wall away from the bottom wall and the bottom wall is L1, and the distance between the edge of the first side plate away from the bottom wall and the bottom wall is L2, wherein L1<L2.

12. The battery cell according to claim 11, characterized in that: The edge of the side wall facing away from the bottom wall and the edge of the first side plate facing away from the bottom wall are arranged at an angle.

13. The battery cell according to any one of claims 1 to 7, characterized in that: The second side wall includes a connecting plate and a folding plate, each of the first side walls is connected to the second side wall via the folding plate, and the folding plate overlaps one side of the connecting plate along the second direction.

14. The battery cell according to claim 13, characterized in that: The distance from the edge of the connecting plate on the side away from the bottom wall to the bottom wall is h, and the distance from the edge of the first side wall on the side away from the bottom wall to the bottom wall is H1, wherein h<H1.

15. The battery cell according to any one of claims 1 to 7, characterized in that: Each of the first side walls is formed with a positioning hole.

16. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The battery according to claim 16 is used to provide electrical energy to the electrical device.

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