Shell of battery monomer, battery monomer, battery and electric device

Abstract

The utility model provides a shell of a battery monomer, the battery monomer, a battery and an electric device, and belongs to the technical field of batteries. The shell of the battery monomer comprises a top cover which comprises a top plate and a vertical edge, and the upper end of the vertical edge is connected with the bottom edge of the top plate; the shell defines a containing cavity used for installing a battery cell, the top of the containing cavity is open, and the lower end of the vertical edge is connected with the side wall of the shell so as to seal the containing cavity. According to the shell of the battery monomer, through the arrangement of the vertical edge, the connection reliability between the shell and the vertical edge can be improved, the probability that a battery cell leaks liquid from the position due to the connection failure between the shell and the vertical edge is reduced, and the use safety of a battery is improved.

Description

Technical Field

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

[0002] In the related art, the outer shell of a battery cell usually includes a top plate and a shell. The bottom surface of the top plate is connected to the top surface of the shell by top welding or side welding. The connection between the top plate and the shell is the heat-affected zone after welding. The performance of the top plate and the shell themselves located in the heat-affected zone is reduced. At the same time, the connection between the top plate and the shell forms a corner, which is a stress concentration area. That is, the connection between the top plate and the shell is in the heat-affected zone and the stress concentration area at the same time. When the battery is subjected to cycle and vibration tests, the battery cell is prone to leakage at the connection between the top plate and the shell, affecting the safe use of the battery. Utility Model Content

[0003] The present application provides a battery cell housing, comprising:

[0004] A top cover, comprising a top plate and a vertical edge, wherein the upper end of the vertical edge is connected to the bottom edge of the top plate;

[0005] The shell defines a housing for mounting the battery cell, the top of the housing is open, and the lower end of the vertical edge is connected to the side wall of the shell to close the housing.

[0006] According to the battery cell housing of the embodiment of the present application, the vertical edge is set to improve the connection reliability between the shell and the vertical edge, reduce the probability of battery cell leakage from there due to failure of the connection between the shell and the vertical edge, and help improve the safety of battery use.

[0007] In the above technical solution, the distance L1 from the connecting surface of the vertical side and the side wall to the bottom surface of the top plate satisfies: 1.3mm≤L1≤50mm.

[0008] In the above technical solution, a chamfer is provided between the bottom surface of the top plate and the inner wall surface of the vertical edge.

[0009] In the above technical solution, the radius R of the rounded corner satisfies: 0.3mm≤R≤15mm.

[0010] In the above technical solution, a notch is provided at the connection between the bottom surface of the top plate and the inner wall surface of the vertical side. The notch is recessed toward the top surface of the top plate relative to the bottom surface of the top plate, and the notch is flush with the inner wall surface of the vertical side close to the side wall of the vertical side.

[0011] In the above technical solution, the angle between the wall surface of the notch facing away from the vertical edge and the bottom surface of the top plate is an obtuse angle.

[0012] In the above technical solution, the thickness T1 of the vertical edge satisfies: 0.4mm≤T1≤2mm;

[0013] and / or,

[0014] The thickness T2 of the side wall satisfies: 0.4 mm ≤ T2 ≤ 2 mm;

[0015] and / or,

[0016] The thickness T3 of the top plate satisfies: 1mm≤T3≤3mm.

[0017] In the above technical solution, at least a portion of the vertical side coincides with at least a portion of the side wall along the normal direction of the vertical side.

[0018] In the above technical solution, the bottom surface of the vertical side and the top surface of the side wall are both inclined surfaces, and the bottom inclined surface of the vertical side is connected to the top inclined surface of the side wall.

[0019] In the above technical solution, the inner wall surface of the vertical edge coincides with the outer wall surface of the side wall, and the vertical edge and the side wall are connected in the overlapping area;

[0020] or,

[0021] The outer wall surface of the vertical edge coincides with the inner wall surface of the side wall, and the vertical edge and the side wall are connected in the coincident area.

[0022] In the above technical solution, one of the vertical edge and the side wall is provided with a positioning groove open toward the other, and the other of the vertical edge and the side wall is provided with a positioning protrusion, and the positioning groove is suitable for plugging and fitting with the positioning protrusion.

[0023] In the above technical solution, the positioning protrusion protrudes inwardly from the inner wall surface or the outer wall surface of the vertical edge along the normal direction of the vertical edge, and the positioning groove is provided on the side of the vertical edge facing the corresponding side wall.

[0024] In the above technical solution, the positioning groove is located on the bottom surface of the vertical edge, the positioning protrusion is located on the inner side of the side wall, and the top surface height of the positioning protrusion is greater than the top surface height of the side wall.

[0025] In the above technical solution, the width of the lower end of the vertical side is greater than the width of the upper end of the side wall, and the positioning groove is located in the middle of the lower end of the vertical side.

[0026] In the above technical solution, the positioning protrusion is located on the inner side of the connecting surface between the vertical edge and the side wall.

[0027] In the above technical solution, the inner wall surface of the vertical edge is provided with a first protrusion protruding inward along the normal direction of the vertical edge, the bottom surface height of the first protrusion is lower than the height of the connecting surface between the side wall and the vertical edge, and the outer wall surfaces of the vertical edge and the side wall are flush.

[0028] In the above technical solution, the following conditions are satisfied: 2T2≤T4≤T3;

[0029] Among them, T2 is the thickness of the side wall, T3 is the thickness of the top plate, and T4 is the distance from the outer wall surface of the vertical edge to the inner wall surface of the first protrusion.

[0030] In the above technical solution, the lower end of the vertical edge is butted against the upper end of the side wall.

[0031] In the above technical solution, the inner wall surface of the vertical side is provided with a first boss protruding outward along the normal direction of the vertical side, and the inner wall surface of the side wall is provided with a second boss protruding outward along the horizontal direction;

[0032] or,

[0033] The outer wall surface of the vertical edge is provided with a first boss protruding outward along the normal direction of the vertical edge, and the outer wall surface of the side wall is provided with a second boss protruding outward along the horizontal direction;

[0034] The bottom surface of the first boss is flush with the bottom surface of the vertical edge, and the bottom surface of the second boss is flush with the top surface of the shell.

[0035] In a second aspect, an embodiment of the present application provides a battery cell, comprising:

[0036] A housing of a battery cell as described in any one of the above;

[0037] A battery cell is installed in the shell.

[0038] In the above technical solution, the distance L2 from the connection surface between the vertical side of the housing and the side wall of the housing to the top surface of the battery cell satisfies: 1mm≤L2≤50mm.

[0039] In a third aspect, an embodiment of the present application provides a battery, comprising:

[0040] A plurality of battery cells as described in any one of the above.

[0041] In a fourth aspect, an embodiment of the present application provides an electrical device, including:

[0042] The battery as described in any one of the above is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0045] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0046] Figure 3 A schematic structural diagram of a battery cell housing provided in some embodiments of the present application;

[0047] Figure 4 An exploded view of the structure of the housing of a battery cell provided in some embodiments of the present application;

[0048] Figure 5 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0049] Figure 6 This is one of the partial structural schematic diagrams of the battery cell housing provided in some embodiments of the present application;

[0050] Figure 7 This is a second schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0051] Figure 8 This is a third schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0052] Figure 9 This is a fourth schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0053] Figure 10 This is a fifth schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0054] Figure 11 A sixth schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0055] Figure 12 This is a seventh schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0056] Figure 13 This is an eighth schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0057] Figure 14 A ninth schematic diagram of a partial structure of a battery cell housing provided in some embodiments of the present application;

[0058] Figure 15 This is a tenth schematic diagram of the partial structure of the outer shell of a battery cell provided in some embodiments of the present application.

[0059] Reference numerals:

[0060] Vehicle 1, motor 20, controller 30;

[0061] Battery 10, battery case 11, battery cell 12;

[0062] Housing 121, battery cell 122;

[0063] Top cover 1211, top plate 12111, vertical edge 12112, notch 121121, first protrusion 121122, positioning groove 121123, first boss 121124;

[0064] Shell 1212, side wall 12121, positioning protrusion 12122, second boss 12123, accommodating cavity 12124;

[0065] Connecting surface 1213. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0071] The term "multiple" in this application 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).

[0072] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0075] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0076] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0077] The inventors found that in the related art, the outer shell of a battery cell usually includes a top plate and a shell, and the bottom surface of the top plate is connected to the top surface of the shell by top welding or side welding. The connection between the top plate and the shell is a heat-affected zone after welding. The performance of the top plate and the shell themselves located in the heat-affected zone is reduced. At the same time, the connection between the top plate and the shell forms a corner, which is a stress concentration area. That is, the connection between the top plate and the shell is in the heat-affected zone and the stress concentration area at the same time. When the battery is subjected to cycle and vibration tests, the battery cell is prone to leakage at the connection between the top plate and the shell, affecting the safe use of the battery.

[0078] Based on the above considerations, and to address the issue of poor performance at the connection between the top plate and the shell, which can lead to leakage of battery cells from this location, the inventors, after in-depth research, designed a battery cell housing comprising a top cover and a shell. The top cover comprises a top plate and a vertical edge, the upper end of which is connected to the bottom edge of the top plate. The shell defines a receiving cavity for mounting the battery cell. The top of the cavity is open, and the lower end of the vertical edge is connected to the side wall of the shell to seal the cavity.

[0079] In the outer shell of a battery cell of this structure, by setting the top cover as a top plate plus a vertical edge structure, this structure can be used to connect the lower end of the vertical edge to the shell, so that the connection between the shell and the top cover is staggered with the stress concentration area of ​​the top cover, thereby reducing the stress concentration at the connection between the shell and the top cover, improving the connection reliability between the shell and the top cover, and reducing the probability of battery leakage from this location due to failure of the connection between the shell and the top cover, thereby helping to improve the safety of battery use.

[0080] The batteries disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery thermal management system disclosed in this application and batteries can be used to form such electrical devices. This helps expand the scope of application of the battery thermal management system and reduces the difficulty of assembling the battery thermal management system.

[0081] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0082] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present application.

[0083] like Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0084] In order to meet different power requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0085] like Figure 2 The figure shows an exploded view of the structure of a battery 10 according to an embodiment of the present application. The battery 10 includes a housing 11 and a plurality of battery cells 12, which are intended to be housed within the housing 11. The housing 11 is used to provide assembly space for the battery cells 12, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 can include a first housing body 111 and a second housing body 112, which cover each other and together define an assembly space for accommodating the battery cells 12. The second housing body 112 can be a hollow structure with one end open. The first housing body 111 can be a plate-like structure, and the first housing body 111 covers the open side of the second housing body 112, so that the first housing body 111 and the second housing body 112 jointly define an assembly space. The first housing body 111 and the second housing body 112 can also be hollow structures with one end open, and the open side of the first housing body 111 covers the open side of the second housing body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0086] In the battery 10, the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 12. The multiple battery cells 12 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 12 is housed within the housing 11. Alternatively, the battery 10 can be constructed by first connecting multiple battery cells 12 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure housed within the housing 11. The battery 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 12.

[0087] The embodiment of the present application provides a housing 121 of a battery cell 12, such as Figure 1-Figure 3 As shown, the outer shell 121 of the battery cell 12 includes a top cover 1211 and a shell 1212 .

[0088] Among them, such as Figure 3-Figure 5 As shown, the top cover 1211 includes a top plate 12111 and a vertical edge 12112. The top plate 12111 can be a circular structure, a trapezoidal structure or other shape structures, for example, Figure 3-Figure 5 As shown, the top plate 12111 is a rectangular structure.

[0089] like Figure 3-Figure 15 As shown, the upper end of the vertical edge 12112 is connected to the bottom of the top plate 12111, and the vertical edge 12112 is arranged around the bottom edge of the top plate 12111, that is, the bottom of the top cover 1211 is an open slot.

[0090] The upper end of the vertical edge 12112 can be connected to the bottom edge of the top plate 12111 or to the inner side of the bottom of the top plate 12111 , that is, the edge of the top plate 12111 protrudes outward in the horizontal direction relative to the vertical edge 12112 .

[0091] like Figure 6-Figure 15 As shown, the thickness of the vertical edge 12112 is less than the thickness of the top plate 12111. Since the connected vertical edge 12112 protrudes downward relative to the bottom of the top plate 12111, a corner with a sudden change in thickness is formed between the upper end of the vertical edge 12112 and the top plate 12111, and the corner is a stress concentration area.

[0092] The vertical side 12112 and the top plate 12111 can be formed as one piece, or they can be provided separately and connected to each other. The upper end of the vertical side 12112 and the bottom of the top plate 12111 can be connected by welding, bonding or other methods.

[0093] like Figure 4 、 Figure 6-Figure 15As shown, the housing 1212 defines a receiving cavity 12124 for mounting the battery cell 122. The housing 1212 may be a cylindrical structure, a prismatic structure, or other shapes, such as Figure 3-Figure 5 As shown, the shell 1212 is a rectangular structure, and the interior of the shell 1212 is a hollow structure. The hollow part of the shell 1212 is the accommodating cavity 12124.

[0094] like Figure 4 As shown, the top of the accommodating cavity 12124 is open, and the lower end of the vertical edge 12112 is connected to the side wall 12121 of the shell 1212 to close the accommodating cavity 12124. The lower end of the vertical edge 12112 can be connected to the side wall 12121 of the shell 1212 by bonding, welding or other means.

[0095] During actual implementation, when the vertical edge 12112 is connected to the shell 1212 by welding, the lower end of the vertical edge 12112 is welded to the side wall 12121 of the shell 1212 to seal the accommodating cavity 12124. At this time, the welding point between the lower end of the vertical edge 12112 and the side wall 12121 of the shell 1212 is a heat-affected zone, and the connection between the upper end of the vertical edge 12112 and the top plate 12111 is a stress concentration zone. Since the vertical edge 12112 itself has a certain height, at least part of the heat-affected zone can be separated from at least part of the stress concentration zone.

[0096] By setting the above-mentioned vertical edge 12112, the connection between the upper end of the vertical edge 12112 and the top plate 12111 can be used as a stress concentration area, and the connection between the lower end of the vertical edge 12112 and the side wall 12121 of the shell 1212 can be used as a heat-affected area. At this time, the overlapping area of ​​the stress concentration area and the heat-affected area on the shell 121 of the battery cell 12 can be reduced, thereby reducing the stress concentration at the connection between the vertical edge 12112 and the side wall 12121 of the shell 1212, thereby improving the performance of the connection between the vertical edge 12112 and the side wall 12121 of the shell 1212, thereby reducing the possibility of leakage of the battery cell 122.

[0097] According to the shell 121 of the battery cell 12 in the embodiment of the present application, the provision of the vertical edge 12112 can improve the connection reliability between the shell 1212 and the vertical edge 12112, reduce the probability of the battery cell 122 leaking from there due to failure of the connection between the shell 1212 and the vertical edge 12112, and help improve the safety of battery use.

[0098] In some embodiments, as Figure 6-Figure 15 As shown, the distance L1 from the connecting surface 12123 between the vertical edge 12112 and the side wall 12121 to the bottom surface of the top plate 12111 satisfies: 1.3 mm ≤ L1 ≤ 50 mm.

[0099] Among them, the value range of L1 is [1.3mm, 50mm]. The specific value of L1 can be 1.3mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm or other values ​​between 1.3mm-50mm, which is not specifically limited here.

[0100] It is understandable that if Figure 6-Figure 15 As shown, as L1 increases, the height of the vertical side 12112 increases, and the distance between the upper end and the lower end of the vertical side 12112 increases, that is, the interval between the heat-affected zone and the stress concentration zone of the outer shell 121 of the battery cell 12 increases. Therefore, by setting the distance L1 from the connecting surface 12123 of the vertical side 12112 and the side wall 12121 to the bottom surface of the top plate 12111 to satisfy 1.3mm≤L1≤50mm, the probability of the battery cell 122 being prone to leakage due to a large overlapping area of ​​the heat-affected zone and the stress concentration zone of the outer shell 121 caused by L1 being too small can be reduced. At the same time, the probability of the outer shell 121 being difficult to install due to an increase in the overall volume due to L1 being too large can be reduced.

[0101] In some embodiments, as Figure 6-Figure 15 As shown, a chamfer is provided between the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112 .

[0102] Among them, chamfered corners are provided around the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112.

[0103] It can be understood that the bottom surface of the top plate 12111 is a plane, and the top surface and side surfaces of the vertical edge 12112 are both planes. Therefore, after the top plate 12111 and the vertical edge 12112 are connected, the connection between the two is a sharp angle, and the sharp angle itself is a stress concentration area. Therefore, by providing a chamfer between the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112, the stress concentration between the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112 can be reduced, that is, the stress concentration at the corner after the top plate 12111 and the vertical edge 12112 are connected is reduced, and the influence of the stress concentration area on the connection between the vertical edge 12112 and the side wall 12121 of the shell 1212 is further reduced, which helps to further improve the safety of the battery.

[0104] In some embodiments, as Figure 6-Figure 15 As shown, the radius R of the fillet satisfies: 0.3mm≤R≤15mm.

[0105] Among them, the value range of R is [0.3mm, 15mm], and R can be specifically 0.3mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 10mm, 12mm, 15mm or other values ​​between 0.3mm-15mm, which is not specifically limited here.

[0106] like Figure 6-Figure 15 As shown, when a chamfer is provided between the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112, L1-R satisfies 1mm≤L1-R≤49.7mm.

[0107] By setting the radius of the fillet to satisfy 0.3mm≤R≤15mm, the probability of poor stress concentration reduction due to R being too small can be reduced. At the same time, the probability of the fillet being affected by the heat-affected zone due to the reduction in the distance between the lower end of the fillet and the heat-affected zone due to R being too large can be reduced.

[0108] In some embodiments, as Figure 6 As shown, a notch 121121 is provided at the connection between the bottom surface of the top plate 12111 and the inner wall surface of the vertical side 12112. The notch 121121 is recessed relative to the bottom surface of the top plate 12111 toward the top surface of the top plate 12111, and the side wall 12121 of the notch 12112 close to the vertical side 12112 is flush with the inner wall surface of the vertical side 12112.

[0109] Among them, such as Figure 6 As shown, the notch 121121 is recessed relative to the bottom surface of the top plate 12111 toward the top surface of the top plate 12111, that is, the connection between the top plate 12111 and the vertical edge 12112 is moved vertically upward for a certain distance. Since there is a chamfer between the bottom surface of the top plate 12111 and the inner wall surface of the vertical edge 12112, the bottom wall of the notch 121121 is an arc structure.

[0110] like Figure 6 As shown, the side wall 12121 of the notch 121121 close to the vertical edge 12112 is flush with the inner wall surface of the vertical edge 12112, that is, the vertical edge 12112 and the top plate 12111 are connected at the notch 121121, and the corner between the vertical edge 12112 and the top plate 12111 is also located at the notch 121121. At this time, L1 is the distance from the connecting surface 12123 of the vertical edge 12112 and the side wall 12121 to the lower end point of the rounded corner of the bottom wall of the notch 121121, and L1 satisfies [1mm, 50mm].

[0111] By providing the notch 121121 , L1 can be increased without increasing the height of the vertical side 12112 , thereby further reducing stress concentration at the connection between the vertical side 12112 and the side wall 12121 of the housing 1212 .

[0112] In some embodiments, as Figure 6 As shown, the angle B between the wall surface of the notch 121121 away from the vertical edge 12112 and the bottom surface of the top plate 12111 is an obtuse angle.

[0113] The angle B between the wall surface of the notch 121121 away from the vertical edge 12112 and the bottom surface of the top plate 12111 may be greater than or equal to 120°, or may meet other angle requirements.

[0114] By setting the angle B between the wall surface of the notch 121121 facing away from the vertical edge 12112 and the bottom surface of the top plate 12111 to be an obtuse angle, the stress concentration at this location can be reduced, thereby improving the strength and toughness of the top plate 12111.

[0115] In some embodiments, as Figure 6-Figure 15 As shown, the thickness T1 of the vertical edge 12112 satisfies: 0.4mm≤T1≤2mm; and / or, the thickness T2 of the side wall 12121 satisfies: 0.4mm≤T2≤2mm; and / or, the thickness T3 of the top plate 12111 satisfies: 1mm≤T3≤3mm.

[0116] Among them, Figure 6-Figure 15 As shown, the thickness T1 of the vertical edge 12112 satisfies 0.4 mm ≤ T1 ≤ 2 mm, while the thickness T2 of the side wall 12121 satisfies 0.4 mm ≤ T2 ≤ 2 mm, and the thickness T3 of the top plate 12111 satisfies 1 mm ≤ T3 ≤ 3 mm.

[0117] The value range of T1 is [0.4mm, 2mm]. The specific value of T1 can be 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 1.9mm, 1.95mm, 2mm or other values ​​between 0.4mm-2mm, which are not specifically limited here.

[0118] By setting the thickness T1 of the vertical edge 12112 to satisfy 0.4mm≤T1≤2mm, the probability of insufficient strength and rigidity of the top cover 12111 due to T1 being too small can be reduced. At the same time, the increase in the connection area 12123 between the vertical edge 12112 and the top plate 12111 due to T1 being too large can be reduced, thereby increasing the difficulty of installation.

[0119] The value range of T2 is [0.4mm, 2mm]. The specific value of T2 can be 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 1.9mm, 1.95mm, 2mm or other values ​​between 0.4mm-2mm, which are not specifically limited here.

[0120] By setting the thickness T2 of the side wall 12121 to satisfy 0.4mm≤T2≤2mm, the probability of insufficient strength and rigidity of the side wall 12121 due to T2 being too small can be reduced. At the same time, the increase in the volume of the shell 1212 due to T2 being too large can be reduced, which helps to improve the miniaturization of the battery.

[0121] It should be noted that if Figure 6-Figure 15 As shown, the thickness of the vertical edge 12112 and the thickness of the side wall 12121 can be equal to each other, so as to facilitate the connection between the vertical edge 12112 and the side wall 12121. There is no sudden change in thickness at the connection between the vertical edge 12112 and the side wall 12121, thereby reducing stress concentration at the connection between the vertical edge 12112 and the side wall 12121 and further reducing the probability of leakage of the battery cell 122.

[0122] The value range of T3 is [1mm, 3mm]. The specific value of T3 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm or other values ​​between 1mm-3mm, which are not specifically limited here.

[0123] By setting the thickness T3 of the top plate 12111 to satisfy 1mm≤T3≤3mm, the insufficient strength and rigidity of the top plate 12111 itself due to T3 being too small can be reduced, and the probability of the top plate 12111 being too heavy and causing a dent in the notch 121121 due to T3 being too large can be reduced.

[0124] In some embodiments, as Figure 7-13 As shown, at least a portion of the vertical edge 12112 coincides with at least a portion of the side wall 12121 along the normal direction of the vertical edge 12112 .

[0125] Among them, such as Figure 7-13 As shown, since the vertical edge 12112 protrudes vertically downward relative to the bottom surface of the top plate 12111, the normal direction of the vertical edge 12112 is the horizontal direction, that is, at least part of the vertical edge 12112 coincides with at least part of the side wall 12121 in the horizontal direction.

[0126] like Figure 7-13 As shown, at least a portion of the vertical side 12112 and at least a portion of the side wall 12121 may be connected in the horizontal direction, or at least a portion of the vertical side 12112 and at least a portion of the side wall 12121 may overlap in the horizontal direction without being connected.

[0127] By arranging at least a portion of the vertical edge 12112 and at least a portion of the side wall 12121 to overlap along the normal direction of the vertical edge 12112 , the contact area between the vertical edge 12112 and the side wall 12121 can be increased, and the weld strength can be improved when the vertical edge 12112 and the side wall 12121 are welded.

[0128] In some embodiments, as Figure 7 As shown, the bottom surface of the vertical side 12112 and the top surface of the side wall 12121 are both inclined surfaces, and the bottom inclined surface of the vertical side 12112 is connected to the top inclined surface of the side wall 12121.

[0129] Among them, Figure 7 As shown, the bottom surface of the vertical side 12112 can be rotated at a certain angle around its own length direction to form an inclined surface, or it can be rotated at a certain angle around its own width direction to form an inclined surface; the top surface of the side wall 12121 can be rotated at a certain angle around its own length direction to form an inclined surface, or it can be rotated at a certain angle around its own width direction to form an inclined surface, for example, Figure 7 As shown, the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 are both rotated around their own length direction at a certain angle to form an inclined surface.

[0130] It should be noted that the inclination angle of the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 can be between 15° and 75°, and other suitable inclination angles can be selected according to needs.

[0131] In actual implementation, the top cover 1211 is docked with the top of the shell 1212, and the bottom surface of the vertical edge 12112 is connected to the top surface of the side wall 12121 by welding, bonding or other methods.

[0132] It can be understood that compared to the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 being horizontal surfaces and butted together, the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 are set as inclined surfaces, which can increase the contact area between the vertical edge 12112 and the side wall 12121, thereby improving the reliability and stability of the connection between the vertical edge 12112 and the side wall 12121.

[0133] In some embodiments, as Figure 8 As shown, the inner wall surface of the vertical edge 12112 coincides with the outer wall surface of the side wall 12121 , and the vertical edge 12112 and the side wall 12121 are connected in the overlapping area.

[0134] Among them, the length and width of the shell 1212 are both smaller than the length and width of the top cover 1211. In actual implementation, when the shell 1212 is docked with the top cover 1211, the upper end of the side wall 12121 of the shell 1212 is located in the groove of the top cover 1211. At this time, the inner wall surface of the vertical edge 12112 and the outer wall surface of the side wall 12121 coincide with each other in the normal direction of the vertical edge 12112. The bottom surface of the vertical edge 12112 has no contact with the top surface of the side wall 12121, and the two are connected in the overlapping area by welding, bonding or other means.

[0135] In other embodiments, Figure 9 As shown, the outer wall surface of the vertical edge 12112 coincides with the inner wall surface of the side wall 12121 , and the vertical edge 12112 and the side wall 12121 are connected in the overlapping area.

[0136] Among them, the length and width of the shell 1212 are both greater than the length and width of the top cover 1211. In actual implementation, when the shell 1212 is docked with the top cover 1211, the lower end of the vertical edge 12112 is located in the accommodating cavity 12124. At this time, the outer wall surface of the vertical edge 12112 and the inner wall surface of the side wall 12121 coincide with each other in the normal direction of the vertical edge 12112. The bottom surface of the vertical edge 12112 has no contact with the top surface of the side wall 12121, and the two are connected in the overlapping area by welding, bonding or other means.

[0137] By setting the inner wall surface of the vertical edge 12112 to coincide with the outer wall surface of the side wall 12121, or setting the outer wall surface of the vertical edge 12112 to coincide with the inner wall surface of the side wall 12121, when the vertical edge 12112 and the side wall 12121 are connected by welding, the inner wall surface of the vertical edge 12112 and the outer wall surface of the side wall 12121, or the outer wall surface of the vertical edge 12112 and the inner wall surface of the side wall 12121, can be connected by side welding, thereby reducing the probability of solder entering the shell 1212 and affecting the battery cell 122 during welding, further helping to improve the safety of battery use.

[0138] In some embodiments, as Figure 10-12 As shown, one of the vertical edge 12112 and the side wall 12121 is provided with a positioning groove 121123 open toward the other, and the other of the vertical edge 12112 and the side wall 12121 is provided with a positioning protrusion 12122, and the positioning groove 121123 is suitable for plugging and matching with the positioning protrusion 12122.

[0139] Among them, a positioning groove 121123 open toward the side wall 12121 can be provided on the vertical edge 12112, and a positioning protrusion 12122 can be provided on the side wall 12121. Alternatively, a positioning groove 121123 open toward the side wall 12121 can be provided on the side wall 12121, and a positioning protrusion 12122 can be provided on the vertical edge 12112, for example. Figure 10-12 As shown, a positioning groove 121123 open toward the side wall 12121 is provided on the vertical edge 12112 , and a positioning protrusion 12122 is provided on the side wall 12121 .

[0140] like Figure 10-12 As shown, the positioning groove 121123 and the positioning protrusion 12122 can be plugged into and matched with each other in the horizontal direction, in the vertical direction, or in other directions.

[0141] During the actual implementation process, when installing the top cover 1211 and the shell 1212, the top cover 1211 is placed on the upper end of the shell 1212, and the positioning groove 121123 on the vertical edge 12112 of the top cover 1211 is aligned with the positioning protrusion 12122 on the side wall 12121 of the shell 1212 and plugged into each other; when the positioning groove 121123 is plugged into the positioning protrusion 12122, the top cover 1211 is located in the designated installation position. At this time, the top cover 1211 can be connected to the shell 1212 by welding, bonding or other methods.

[0142] The positioning grooves 121123 and the positioning protrusions 12122 facilitate positioning of the top cover 1211 and the shell 1212 during installation, so that the top cover 1211 can be quickly installed in the designated installation position, thereby helping to improve the installation efficiency of the battery cell 12.

[0143] In some embodiments, as Figure 10 As shown, the positioning protrusion 12122 protrudes inward along the normal direction of the vertical edge 12112 on the inner wall surface or the outer wall surface of the vertical edge 12112, and the positioning groove 121123 is provided on the side of the vertical edge 12112 facing the corresponding side wall 12121.

[0144] Among them, the positioning protrusion 12122 can be a circular structure, a trapezoidal structure, a triangular structure or other shape structures, and the positioning groove 121123 can be a circular structure, a trapezoidal structure, a triangular structure or other shape structures, such as Figure 10 As shown, the positioning protrusion 12122 and the positioning groove 121123 are both rectangular structures.

[0145] like Figure 10 As shown, the positioning protrusion 12122 can protrude inwardly along the horizontal direction on the inner wall surface of the vertical edge 12112, and the lower end portion of the vertical edge 12112 extends inwardly along the horizontal direction, and the bottom height of the extended portion is lower than the bottom height of the positioning protrusion 12122. The positioning groove 121123 is provided on the side of the extended portion of the vertical edge 12112 facing the side wall 12121, and the positioning groove 121123 is plugged into and matched with the positioning protrusion 12122 in the horizontal direction.

[0146] The positioning protrusion 12122 can also protrude outward in the horizontal direction on the outer wall surface of the vertical edge 12112, and the lower end portion of the vertical edge 12112 extends outward in the horizontal direction, and the bottom height of the extended portion is lower than the bottom height of the positioning protrusion 12122. The positioning groove 121123 is provided on the side of the extended portion of the vertical edge 12112 facing the side wall 12121, and the positioning groove 121123 is plugged into and matched with the positioning protrusion 12122 in the horizontal direction.

[0147] By setting the positioning protrusion 12122 and the positioning groove 121123 to be plug-fitted in the horizontal direction, the positioning protrusion 12122 and the positioning groove 121123 can have a limiting effect in both the vertical direction and the horizontal direction, thereby improving the stability of the top cover 1211 and the shell 1212 when connecting them, making installation easier.

[0148] It should be noted that if Figure 10 As shown, the positioning protrusion 12122 preferably protrudes inwardly in the horizontal direction on the inner wall surface of the vertical edge 12112, and the outer wall surface of the vertical edge 12112 is arranged flush with the outer wall surface of the side wall 12121 to facilitate the subsequent stacking and installation of multiple battery cells 12.

[0149] In some embodiments, as Figure 11 and Figure 13 As shown, the positioning groove 121123 is located on the bottom surface of the vertical edge 12112 , the positioning protrusion 12122 is located on the inner side of the side wall 12121 , and the top surface height of the positioning protrusion 12122 is greater than the top surface height of the side wall 12121 .

[0150] Among them, Figure 11 and Figure 13 As shown, the positioning groove 121123 is recessed upward relative to the bottom surface of the vertical edge 12112, and the positioning protrusion 12122 can be a bent structure. One end of the positioning protrusion 12122 is connected to the inner wall surface of the side wall 12121, and the other end of the positioning protrusion 12122 extends in the vertical direction. The top surface height of the other end of the positioning protrusion 12122 is greater than the top surface height of the side wall 12121. At this time, the positioning protrusion 12122 protruding upward in the vertical direction and the positioning groove 121123 can be plugged and matched in the vertical direction.

[0151] like Figure 11 and Figure 12 As shown, the outer wall surface of the vertical edge 12112 is flush with the outer wall surface of the side wall 12121 to facilitate the subsequent stacking and installation of multiple battery cells 12.

[0152] In some embodiments, as Figure 11 As shown, the positioning groove 121123 is located on the inner side of the bottom surface of the vertical edge 12112, that is, the bottom and inner side of the positioning groove 121123 are both open. When the positioning protrusion 12122 is plugged into the positioning groove 121123, the outer wall surface of the vertical edge 12112 is flush with the outer wall surface of the side wall 12121, and the inner wall surface of the vertical edge 12112 is flush with the inner wall surface of the positioning protrusion 12122.

[0153] By setting the positioning groove 121123 and the positioning protrusion 12122 to be plug-fitted in the vertical direction, the top cover 1211 can be moved from top to bottom when assembling the top cover 1211 and the shell 1212 to make the positioning groove 121123 and the positioning protrusion 12122 plug-fitted, which is easy to operate and does not require much effort.

[0154] In some embodiments, as Figure 12 As shown, the width of the lower end of the vertical side 12112 is greater than the width of the upper end of the side wall 12121 , and the positioning groove 121123 is located in the middle of the lower end of the vertical side 12112 .

[0155] Among them, Figure 12 As shown, the width of the lower end of the vertical edge 12112 is greater than the width of the upper end of the side wall 12121, and the outer wall surface of the vertical edge 12112 is arranged flush with the outer wall surface of the side wall 12121, that is, the inner side of the lower end of the vertical edge 12112 protrudes inward relative to the inner wall surface of the positioning protrusion 12122 located on the inner side, and the positioning groove is provided in the middle part of the lower end of the vertical edge 12112, and the positioning protrusion 12122 and the positioning groove 121123 can be plugged and matched in the vertical direction.

[0156] By setting the lower end width of the vertical edge 12112 to be greater than the upper end width of the side wall 12121, and the positioning groove 121123 being located in the middle of the lower end of the vertical edge 12112, the inner wall surface and the outer wall surface of the positioning protrusion 12122 can be limited by the side wall 12121 of the positioning groove 121123, thereby facilitating the alignment of the positioning groove 121123 and the positioning protrusion 12122 during insertion, thereby further improving the installation efficiency of the top cover 1211 and the shell 1212.

[0157] In some embodiments, as Figure 6-Figure 15 As shown, the positioning protrusion 12122 is located on the inner side of the connecting surface 12123 between the vertical edge 12112 and the side wall 12121.

[0158] Among them, the positioning protrusion 12122 is located on the inner side of the connecting surface 12123 of the vertical edge 12112 and the side wall 12121, that is, the outer wall surface of the vertical edge 12112 can be set flush with the outer wall surface of the side wall 12121, so that the outer surface of the assembled battery cell 12 is flat, thereby facilitating the subsequent stacking and installation of multiple battery cells 12.

[0159] In some embodiments, as Figure 13 As shown, the inner wall surface of the vertical edge 12112 is provided with a first protrusion 121122 protruding inward along the normal direction of the vertical edge 12112, and the bottom surface height of the first protrusion 121122 is lower than the height of the connecting surface 12123 between the side wall 12121 and the vertical edge 12112, and the outer wall surfaces of the vertical edge 12112 and the side wall 12121 are flush.

[0160] Among them, such as Figure 13 As shown, the first protrusion 121122 protrudes inward in the horizontal direction relative to the inner wall surface of the vertical edge 12112, and the bottom surface of the first protrusion 121122 is located below the connecting surface 12123 between the vertical edge 12112 and the side wall 12121, and the first protrusion 121122 is close to the wall surface of the side wall 12121 and is arranged in contact with the side wall 12121.

[0161] During the actual implementation process, the bottom surface of the vertical edge 12112 is connected to the top surface of the side wall 12121 by butt welding. Since the bottom surface of the first protrusion 121122 is located below the connecting surface 12123 between the vertical edge 12112 and the side wall 12121, and the first protrusion 121122 is close to the wall surface of the side wall 12121 and is arranged in contact with the side wall 12121, the solder splashed during the welding process is blocked by the first protrusion 121122 and cannot enter the accommodating cavity 12124.

[0162] By providing the first protrusion 121122 , the probability of solder splashing into the accommodating cavity 12124 during the welding process can be reduced, thereby reducing the possibility of the battery cell 122 being affected by the solder, and helping to improve the safety of the battery.

[0163] In some embodiments, as Figure 13 As shown, it satisfies: 2T2≤T4≤T3; wherein T2 is the thickness of the side wall 12121 , T3 is the thickness of the top plate 12111 , and T4 is the distance from the outer wall surface of the vertical edge 12112 to the inner wall surface of the first protrusion 121122 .

[0164] By setting T4 to satisfy 2T2≤T4≤T3, the probability of insufficient strength and rigidity of the first protrusion 121122 due to T4 being too small can be reduced, the possibility of deformation or breakage of the first protrusion 121122 due to the heat generated by welding can be reduced, and the probability of increased production costs due to T4 being too large can be reduced.

[0165] In some embodiments, as Figure 14 and Figure 15 As shown, the lower end of the vertical edge 12112 is connected to the upper end of the side wall 12121.

[0166] Among them, the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 are both arranged parallel to the horizontal plane, the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 are butt-jointed, and the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 can be connected by butt welding, bonding or other methods.

[0167] By arranging the lower end of the vertical side 12112 to be butted against the upper end of the side wall 12121 , the installation efficiency between the shell 1212 and the top cover 1211 can be improved, and the production cost can be reduced.

[0168] In some embodiments, as Figure 15 As shown, the inner wall surface of the vertical edge 12112 is provided with a first boss 121124 protruding inward along the normal direction of the vertical edge 12112, and the inner wall surface of the side wall 12121 is provided with a second boss 12123 protruding inward along the horizontal direction. The bottom surface of the first boss 121124 is flush with the bottom surface of the vertical edge 12112, and the bottom surface of the second boss 12123 is flush with the top surface of the shell 1212.

[0169] Among them, such as Figure 15 As shown, the inner wall surface of the lower end of the vertical edge 12112 is provided with a first boss 121124 protruding inwardly along the horizontal direction, and the inner wall surface of the upper end of the side wall 12121 is provided with a second boss 12123 protruding inwardly along the horizontal direction.

[0170] like Figure 15 As shown, the first boss 121124 can be a trapezoidal structure, a triangular structure or other shape structures; the second boss 12123 can be a trapezoidal structure, a triangular structure or other shape structures. For example, the first boss 121124 and the second boss 12123 are both rectangular structures.

[0171] During the actual implementation process, when installing the top cover 1211 and the shell 1212, the bottom surface of the vertical edge 12112 is connected to the top surface of the side wall 12121, and the bottom surface of the first boss 121124 is connected to the top surface of the second boss 12123. The bottom surface of the vertical edge 12112 and the top surface of the side wall 12121, and the bottom surface of the first boss 121124 and the top surface of the second boss 12123 can be connected by butt welding or bonding.

[0172] By disposing the first boss 121124 and the second boss 12123 , the contact area between the vertical edge 12112 and the side wall 12121 can be increased, thereby improving the connection reliability and stability between the vertical edge 12112 and the side wall 12121 .

[0173] The present application also provides a battery cell 12, such as Figure 6-Figure 15 As shown, the battery cell 12 includes a battery core 122 and a shell 121 of the battery cell 12 in any of the above embodiments, and the battery core 122 is installed in the shell 1212 .

[0174] According to the battery cell 12 of the embodiment of the present application, by adopting the shell 121 of the battery cell 12 of any of the above-mentioned embodiments, the connection reliability between the shell 1212 and the vertical edge 12112 can be improved, and the probability of the battery cell 122 leaking from there due to failure of the connection between the shell 1212 and the vertical edge 12112 can be reduced, which helps to improve the safety of battery use.

[0175] In some embodiments, as Figure 6-Figure 15 As shown, the distance L2 from the connection surface 12123 of the vertical side 12112 of the housing 121 and the side wall 12121 of the housing 121 to the top surface of the battery cell 122 satisfies: 1mm≤L2≤50mm.

[0176] Among them, the value range of L2 is [1mm, 50mm]. L2 can be specifically 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm or other values ​​between 1mm-50mm, which are not specifically limited here.

[0177] It is understandable that if Figure 6-Figure 15 As shown, as L2 increases, the height of the side wall 12121 increases, and the height of the battery cell 122 is fixed. At this time, the distance between the upper end of the side wall 12121 and the upper end of the battery cell 122 increases, that is, the interval between the heat-affected zone of the shell 121 of the battery cell 12 and the battery cell 122 increases. Therefore, by setting the distance L2 from the connecting surface 12123 of the vertical edge 12112 of the shell 121 and the side wall 12121 of the shell 121 to the top surface of the battery cell 122 to satisfy 1mm≤L2≤50mm, the probability that the heat-affected zone of the shell 121 has a greater impact on the battery cell 122 due to L2 being too small can be reduced, and at the same time, the probability that the overall volume of the shell 121 increases and becomes difficult to install due to L2 being too large can be reduced.

[0178] An embodiment of the present application further provides a battery, which includes a plurality of battery cells 12 as described in any of the above embodiments.

[0179] According to the battery of the embodiment of the present application, by adopting the battery cell 12 of any of the above-mentioned embodiments, the connection reliability between the shell 1212 and the vertical edge 12112 can be improved, and the probability of the battery cell 122 leaking from there due to failure of the connection between the shell 1212 and the vertical edge 12112 can be reduced, which helps to improve the safety of battery use.

[0180] An embodiment of the present application further provides an electrical device, which includes a battery as described in any of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0181] According to the electrical device of the embodiment of the present application, by adopting the battery of any of the above embodiments, the connection reliability between the shell 1212 and the vertical edge 12112 can be improved, and the probability of the battery cell 122 leaking from there due to failure of the connection between the shell 1212 and the vertical edge 12112 can be reduced, which helps to improve the safety of battery use.

[0182] According to some embodiments of the present application, a housing 121 of a battery cell 12 is provided. Figure 3-Figure 15As shown, the housing 121 includes a top cover 1211 and a shell 1212. The top cover 1211 includes a top plate 12111 and a vertical side 12112. The upper end of the vertical side 12112 is connected to the bottom edge of the top plate 12111. The shell 1212 defines a receiving cavity 12124 for mounting the battery cell 122. The top of the receiving cavity 12124 is open, and the lower end of the vertical side 12112 is connected to the side wall 12121 of the shell 1212 to seal the receiving cavity 12124. A rounded corner is provided between the bottom surface of the top plate 12111 and the inner wall surface of the vertical side 12112. A notch 121121 is provided at the junction between the bottom surface of top plate 12111 and the inner wall of vertical side 12112. Notch 121121 is recessed relative to the bottom surface of top plate 12111 toward the top surface of top plate 12111. The sidewall 12121 of notch 12112 adjacent to vertical side 12112 is flush with the inner wall of vertical side 12112. An obtuse angle B is formed between the wall of notch 121121 facing away from vertical side 12112 and the bottom surface of top plate 12111. At least a portion of vertical side 12112 and at least a portion of sidewall 12121 overlap along the normal to vertical side 12112.

[0183] In some embodiments, the bottom surface of the vertical edge 12112 and the top surface of the side wall 12121 are both inclined surfaces, and the bottom inclined surface of the vertical edge 12112 is connected to the top inclined surface of the side wall 12121.

[0184] Alternatively, the inner wall surface of the vertical side 12112 coincides with the outer wall surface of the side wall 12121 , and the vertical side 12112 and the side wall 12121 are connected in the overlapping area.

[0185] Alternatively, the outer wall surface of the vertical edge 12112 coincides with the inner wall surface of the side wall 12121 , and the vertical edge 12112 and the side wall 12121 are connected in the overlapping area.

[0186] One of the vertical side 12112 and the side wall 12121 is provided with a positioning groove 121123 that is open toward the other, and the other of the vertical side 12112 and the side wall 12121 is provided with a positioning protrusion 12122. The positioning groove 121123 is adapted to be plugged into and mate with the positioning protrusion 12122. The positioning protrusion 12122 protrudes inwardly from the inner or outer wall surface of the vertical side 12112 along the normal direction of the vertical side 12112. The positioning groove 121123 is provided on the side of the vertical side 12112 that faces the corresponding side wall 12121.

[0187] Positioning groove 121123 is located on the bottom surface of vertical side 12112, and positioning protrusion 12122 is located inside side wall 12121. The top surface height of positioning protrusion 12122 is greater than the top surface height of side wall 12121. The lower end width of vertical side 12112 is greater than the upper end width of side wall 12121. Positioning groove 121123 is located in the middle of the lower end of vertical side 12112. Positioning protrusion 12122 is located inside the connecting surface 12123 between vertical side 12112 and side wall 12121. The inner wall surface of the vertical edge 12112 is provided with a first protrusion 121122 protruding inward along the normal direction of the vertical edge 12112. The bottom surface height of the first protrusion 121122 is lower than the height of the connecting surface 12123 between the side wall 12121 and the vertical edge 12112. The outer wall surfaces of the vertical edge 12112 and the side wall 12121 are flush.

[0188] In other embodiments, the lower end of the vertical side 12112 is butted against the upper end of the side wall 12121. A first boss 121124 is provided on the inner wall surface of the vertical side 12112, projecting outward along the normal direction of the vertical side 12112. A second boss 12123 is provided on the inner wall surface of the side wall 12121, projecting outward in a horizontal direction. The bottom surface of the first boss 121124 is flush with the bottom surface of the vertical side 12112, and the bottom surface of the second boss 12123 is flush with the top surface of the housing 1212.

[0189] The distance L1 from the connecting surface 12123 between the vertical edge 12112 and the side wall 12121 to the bottom surface of the top plate 12111 satisfies the following conditions: 1.3 mm ≤ L1 ≤ 50 mm; the radius R of the rounded corner satisfies the following conditions: 0.3 mm ≤ R ≤ 15 mm; the thickness T1 of the vertical edge 12112 satisfies the following conditions: 0.4 mm ≤ T1 ≤ 2 mm; the thickness T2 of the side wall 12121 satisfies the following conditions: 0.4 mm ≤ T2 ≤ 2 mm; the thickness T3 of the top plate 12111 satisfies the following conditions: Satisfies: 1mm≤T3≤3mm; satisfies: 2T2≤T4≤T3, where T2 is the thickness of the side wall 12121, T3 is the thickness of the top plate 12111, and T4 is the distance from the outer wall surface of the vertical edge 12112 to the inner wall surface of the first protrusion 121122; the distance L2 from the connecting surface 12123 of the vertical edge 12112 of the outer shell 121 and the side wall 12121 of the outer shell 121 to the top surface of the battery cell 122 satisfies: 1mm≤L2≤50mm.

[0190] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0191] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell housing, characterized in that: include: A top cover, comprising a top plate and a vertical edge, wherein the upper end of the vertical edge is connected to the bottom of the top plate; The shell defines a housing cavity for installing the battery cell, the top of the housing cavity is open, and the lower end of the vertical edge is connected to the side wall of the shell to close the housing cavity.

2. The battery cell housing according to claim 1, characterized in that: A distance L1 from a connection surface between the vertical edge and the side wall to a bottom surface of the top plate satisfies: 1.3 mm ≤ L1 ≤ 50 mm.

3. The battery cell housing according to claim 1, characterized in that: A rounded corner is arranged between the bottom surface of the top plate and the inner wall surface of the vertical edge.

4. The battery cell housing according to claim 3, characterized in that: The radius R of the rounded corner satisfies: 0.3mm≤R≤15mm.

5. The battery cell housing according to any one of claims 1 to 4, characterized in that: A notch is provided at the connection between the bottom surface of the top plate and the inner wall surface of the vertical edge. The notch is recessed toward the top surface of the top plate relative to the bottom surface of the top plate, and the side wall of the notch close to the vertical edge is flush with the inner wall surface of the vertical edge.

6. The battery cell housing according to claim 5, characterized in that: The angle between the wall surface of the notch away from the vertical edge and the bottom surface of the top plate is an obtuse angle.

7. The battery cell housing according to any one of claims 1 to 4, characterized in that: The thickness T1 of the vertical edge satisfies: 0.4mm≤T1≤2mm; and / or, The thickness T2 of the side wall satisfies: 0.4 mm ≤ T2 ≤ 2 mm; and / or, The thickness T3 of the top plate satisfies: 1mm≤T3≤3mm.

8. The battery cell housing according to any one of claims 1 to 4, characterized in that: At least a portion of the vertical edge coincides with at least a portion of the side wall along a normal direction of the vertical edge.

9. The battery cell housing according to claim 8, characterized in that: The bottom surface of the vertical edge and the top surface of the side wall are both inclined surfaces, and the bottom inclined surface of the vertical edge is connected to the top inclined surface of the side wall.

10. The battery cell housing according to claim 8, characterized in that: The inner wall surface of the vertical edge coincides with the outer wall surface of the side wall, and the vertical edge and the side wall are connected in the overlapping area; or, The outer wall surface of the vertical edge coincides with the inner wall surface of the side wall, and the vertical edge and the side wall are connected in the coincidence area.

11. The battery cell housing according to claim 8, characterized in that: One of the vertical edge and the side wall is provided with a positioning groove which is open toward the other one, and the other of the vertical edge and the side wall is provided with a positioning protrusion, and the positioning groove is suitable for plugging and matching with the positioning protrusion.

12. The battery cell housing according to claim 11, characterized in that: The positioning protrusion protrudes inwardly on the inner wall surface or the outer wall surface of the vertical edge along the normal direction of the vertical edge, and the positioning groove is arranged on a side of the vertical edge facing the corresponding side wall.

13. The battery cell housing according to claim 11, characterized in that: The positioning groove is located at the bottom surface of the vertical edge, the positioning protrusion is located at the inner side of the side wall, and the top surface height of the positioning protrusion is greater than the top surface height of the side wall.

14. The battery cell housing according to claim 13, characterized in that: The width of the lower end of the vertical edge is greater than the width of the upper end of the side wall, and the positioning groove is located in the middle of the lower end of the vertical edge.

15. The battery cell housing according to claim 11, characterized in that: The positioning protrusion is located at the inner side of the connection surface between the vertical edge and the side wall.

16. The battery cell housing according to claim 8, characterized in that: The inner wall surface of the vertical edge is provided with a first protrusion protruding inwardly along the normal direction of the vertical edge, the bottom surface height of the first protrusion is lower than the height of the connecting surface between the side wall and the vertical edge, and the outer wall surfaces of the vertical edge and the side wall are flush.

17. The battery cell housing according to claim 16, characterized in that: Satisfies: 2T2≤T4≤T3; Among them, T2 is the thickness of the side wall, T3 is the thickness of the top plate, and T4 is the distance from the outer wall surface of the vertical edge to the inner wall surface of the first protrusion.

18. The battery cell housing according to any one of claims 1 to 4, characterized in that: The lower end of the vertical edge is butted against the upper end of the side wall.

19. The battery cell housing according to claim 18, characterized in that: The inner wall surface of the vertical edge is provided with a first boss protruding outward along the normal direction of the vertical edge, and the inner wall surface of the side wall is provided with a second boss protruding outward along the horizontal direction; or, The outer wall surface of the vertical edge is provided with a first boss protruding outward along the normal direction of the vertical edge, and the outer wall surface of the side wall is provided with a second boss protruding outward along the horizontal direction; The bottom surface of the first boss is flush with the bottom surface of the vertical edge, and the bottom surface of the second boss is flush with the top surface of the shell.

20. A battery cell, characterized in that: include: The housing of a battery cell according to any one of claims 1 to 19; A battery cell is installed in the shell.

21. The battery cell according to claim 20, characterized in that: A distance L2 from a connection surface between the vertical side of the housing and the side wall of the housing to the top surface of the battery cell satisfies: 1mm≤L2≤50mm.

22. A battery, characterized in that: include: A plurality of battery cells as claimed in claim 20 or 21.

23. An electrical device, characterized in that: include: The battery as claimed in claim 22, wherein the battery is used to provide electrical energy to the electrical device.

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