Single battery, battery pack and power utilization device

Abstract

The utility model provides a single battery, a battery pack and a power utilization device, and relates to the technical field of batteries. The single battery comprises a shell with an accommodating cavity and a first opening, a battery cell arranged in the accommodating cavity, and a first cover plate with a plate body and a connecting body, the first opening is communicated with the containing cavity, the connecting body is connected to the peripheral side of the plate body, the plate body is located in the containing cavity and covers the first opening, an annular buckling groove is formed in the connecting body, a groove opening of the annular buckling groove faces one side of the battery cell, and the end, close to the first opening, of the shell is inserted into the annular buckling groove so that the first cover plate can be connected with the shell. According to the single battery provided by the invention, the assembly tolerance of the shell and the first cover plate in the height direction can be eliminated, and the possibilities of electrolyte leakage and sealing position cracking are reduced, so that the structural strength and stability of the single battery are effectively improved.

Description

Technical Field

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

[0002] The manufacturing process of cylindrical batteries usually involves winding the positive electrode sheet, the negative electrode sheet and the separator to form a battery cell. The ends of the battery cell are flattened or die-cut to form a tab layer, which is welded to the collector plate. The battery cell with the collector plate is then placed in a shell, and a cover plate is sealed at the opening of the shell to assemble the battery.

[0003] In the related art, the cover plate and the opening edge of the shell are connected by laser welding. The disadvantage of the laser welding process is that there is a large assembly tolerance between the cover plate and the shell in the height direction, resulting in insufficient sealing strength, and the weld mark is prone to electrolyte leakage or even cracking. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a single cell, a battery pack and an electrical device, aiming to solve the technical problem in the related art that there is a large assembly tolerance between the cover and the shell in the height direction, which affects the structural strength and structural stability of the cylindrical battery.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a single cell, comprising:

[0007] Battery cells;

[0008] A housing having a housing cavity and a first opening communicating with the housing cavity, wherein the battery cell is disposed in the housing cavity;

[0009] The first cover plate includes a plate body and a connector, wherein the connector is connected to the outer peripheral side of the plate body, the plate body is located in the accommodating cavity and covers the first opening, the connector is provided with an annular buckle groove, the notch of the annular buckle groove is arranged toward one side of the battery cell, and the end of the shell close to the first opening is inserted into the annular buckle groove to realize the connection between the first cover plate and the shell.

[0010] In one of the embodiments of the first aspect, the connecting body includes a first side plate, a second side plate and a top plate, the first side plate is connected to the plate body, the top plate is connected to a side of the first side plate away from the plate body, the second side plate is connected to a side of the top plate away from the first side plate, the first side plate, the second side plate and the top plate are surrounded to form the annular buckle groove, and the first side plate, the second side plate, the top plate and the part of the shell inserted into the annular buckle groove are bent toward one side of the center of the first opening to achieve a sealed connection between the first cover plate and the shell.

[0011] In one of the embodiments of the first aspect, the single battery further includes a first current collecting plate disposed in the accommodating cavity, one side of the first current collecting plate is electrically connected to a side of the battery cell facing the first opening, and the plate body is supported on a side of the first current collecting plate facing away from the battery cell in a surface contact manner.

[0012] In one of the embodiments of the first aspect, the first side plate extends in a direction away from the battery core so that the first side plate and the plate body form a receiving groove, and the receiving groove is used to accommodate a portion of the connector bent toward one side of the center of the first opening and a portion of the shell bent toward one side of the center of the first opening.

[0013] In one embodiment of the first aspect, a portion of the connector bent toward a side of the center of the first opening abuts against a side of the plate body away from the battery core.

[0014] In one embodiment of the first aspect, the annular buckle groove is in a circular ring shape, and the shell is in a cylindrical shape, the outer diameter of the annular buckle groove is d1, the inner diameter of the annular buckle groove is d2, the outer diameter of the shell is D1, and the inner diameter of the shell is D2, satisfying: d1>D1, d2<D2.

[0015] In one embodiment of the first aspect, the height of the outer edge of the annular buckle groove relative to the bottom wall of the annular buckle groove is h1, and the height of the inner edge of the annular buckle groove relative to the bottom wall of the annular buckle groove is h2, satisfying: h2≥h1.

[0016] In one embodiment of the first aspect, the single battery further includes a second cover plate, a second current collecting disk and a positive electrode column, the shell has a second opening connected to the accommodating cavity, the second opening and the first opening are arranged opposite to each other, the second cover plate is sealed at the second opening, the second current collecting disk is arranged in the accommodating cavity, one side of the second current collecting disk is electrically connected to a side of the battery cell facing the second opening, the positive electrode column is penetrated by the second cover plate and is electrically connected to a side of the second current collecting disk facing away from the battery cell.

[0017] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a single cell as described in any of the above embodiments.

[0018] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery pack described in the above embodiment.

[0019] The beneficial effects of this application are:

[0020] In the single cell battery provided in the present application, the first cover plate includes a plate body and a connector connected to the outer peripheral side of the plate body. By setting an annular buckle groove on the connector and inserting the end of the shell close to the first opening into the annular buckle groove, the connection between the first cover plate and the shell can be achieved. Compared with the laser welding method, the first cover plate is buckled on the end of the shell with the first opening through the annular buckle groove, which can eliminate the assembly tolerance of the shell and the first cover plate in the height direction, reduce the possibility of electrolyte leakage and cracking at the sealing position, and effectively improve the structural strength and stability of the single cell battery.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a single cell before upsetting welding in some embodiments of the present application is shown;

[0024] Figure 2 Shows Figure 1 The structural diagram of part A in the figure;

[0025] Figure 3 A schematic diagram of the structure of a single cell after upsetting welding in some embodiments of the present application is shown;

[0026] Figure 4 Shows Figure 3 The structural diagram of part B;

[0027] Figure 5 A schematic diagram of the structure of the first cover plate from one perspective in some embodiments of the present application is shown;

[0028] Figure 6 Shows Figure 5Schematic diagram of the cross-section structure at CC in the middle;

[0029] Figure 7 A schematic diagram of the structure of a single cell after the first cover plate is removed in some embodiments of the present application is shown.

[0030] Description of main component symbols:

[0031] 100-single battery; 110-battery cell; 120-shell; 121-accommodating chamber; 122-first opening; 123-second opening; 130-first cover plate; 131-plate body; 1311-accommodating groove; 132-connecting body; 1321-annular buckle groove; 1322-first side plate; 1323-second side plate; 1324-top plate; 140-first current collecting plate; 150-second cover plate; 160-second current collecting plate; 170-positive pole. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] The manufacturing process of cylindrical batteries usually involves winding the positive electrode sheet, the negative electrode sheet and the separator to form a battery cell. The ends of the battery cell are flattened or die-cut to form a tab layer, which is welded to the collector plate. The battery cell with the collector plate is then placed in a shell, and a cover plate is sealed at the opening of the shell to assemble the battery.

[0038] At present, there are two ways to connect the cover plate to the edge of the shell opening: upsetting and laser welding. The disadvantage of the upsetting process is that the space utilization rate is low, the cover plate cannot contact the battery cell, resulting in a lack of support for the battery cell, which poses a greater safety risk. The disadvantage of the laser welding process is that there is a large assembly tolerance between the cover plate and the shell in the height direction, resulting in insufficient sealing strength, and the weld mark is prone to electrolyte leakage or even cracking.

[0039] In order to solve the above technical problems, an embodiment of the present application provides a single cell 100, which relates to the field of battery technology and is mainly used in battery packs. Of course, it can also be directly used in electric vehicles, energy storage power stations and other electrical devices without taking the form of a battery pack.

[0040] like Figure 1 , Figure 2 and Figure 7 As shown, the single battery 100 provided in this embodiment includes: a battery cell 110 , a housing 120 and a first cover plate 130 .

[0041] The housing 120 has a receiving cavity 121 and a first opening 122 communicating with the receiving cavity 121, and the battery cell 110 is disposed in the receiving cavity 121. The first cover plate 130 includes a plate body 131 and a connector 132, the connector 132 is connected to the outer peripheral side of the plate body 131, the plate body 131 is located in the receiving cavity 121 and covers the first opening 122, the connector 132 is provided with an annular buckle groove 1321, the notch of the annular buckle groove 1321 is arranged toward one side of the battery cell 110, and the end of the housing 120 close to the first opening 122 is plugged into the annular buckle groove 1321 to achieve the connection between the first cover plate 130 and the housing 120.

[0042] It can be understood that in the single cell 100 provided in this embodiment, by setting an annular buckle groove 1321 on the connecting body 132, the end of the shell 120 close to the first opening 122 is inserted into the annular buckle groove 1321, so that the connection between the first cover plate 130 and the shell 120 can be achieved. Compared with the laser welding method, the first cover plate 130 is buckled on the end of the shell 120 close to the first opening 122 through the annular buckle groove 1321, which can eliminate the assembly tolerance of the shell 120 and the first cover plate 130 in the height direction, reduce the possibility of electrolyte leakage and cracking at the sealing position, and effectively improve the structural strength and structural stability of the single cell 100.

[0043] like Figure 2 , Figure 4 and Figure 6 As shown, in one embodiment, the connecting body 132 includes a first side plate 1322, a second side plate 1323 and a top plate 1324, the first side plate 1322 is connected to the plate body 131, the top plate 1324 is connected to the side of the first side plate 1322 away from the plate body 131, the second side plate 1323 is connected to the side of the top plate 1324 away from the first side plate 1322, the first side plate 1322, the second side plate 1323 and the top plate 1324 are surrounded to form an annular buckle groove 1321, and the first side plate 1322, the second side plate 1323, the top plate 1324 and the part of the shell 120 inserted into the annular buckle groove 1321 are bent toward one side of the center of the first opening 122 to achieve a sealed connection between the first cover plate 130 and the shell 120.

[0044] In this embodiment, by making the first side plate 1322, the second side plate 1323, the top plate 1324 and the portion of the shell 120 inserted into the annular buckle groove 1321 bend together toward one side of the center of the first opening 122, that is, making the connector 132 and the portion of the shell 120 inserted into the annular buckle groove 1321 bend together toward one side of the center of the first opening 122, the first cover plate 130 and the shell 120 can be sealed. Connection is achieved to reduce the possibility of electrolyte leakage and cracking at the sealing position.

[0045] like Figure 2 and Figure 4 As shown, further, the single battery 100 also includes a first current collecting tray 140, which is arranged in the accommodating cavity 121, and one side of the first current collecting tray 140 is electrically connected to the side of the battery cell 110 facing the first opening 122, and the plate body 131 is supported on the side of the first current collecting tray 140 away from the battery cell 110 in a surface contact manner.

[0046] In the present embodiment, since the plate body 131 is supported on the side of the first current collecting disk 140 away from the battery cell 110, it provides a supporting force for the battery cell 110. On this basis, the plate body 131 is in surface contact with the first current collecting disk 140, so that the fit between the plate body 131 and the first current collecting disk 140 is improved. In this way, the supporting force applied by the plate body 131 on the battery cell 110 is more centrally and evenly distributed, which can improve the stability of the battery cell 110 in the accommodating cavity 121, thereby improving the safety of the single battery 100.

[0047] like Figure 2 , Figure 5 and Figure 6 As shown, further, the first side plate 1322 extends in a direction away from the battery cell 110 so that the first side plate 1322 and the plate body 131 enclose a receiving groove 1311, and the receiving groove 1311 is used to accommodate a portion of the connector 132 bent toward one side of the center of the first opening 122 and a portion of the shell 120 bent toward one side of the center of the first opening 122.

[0048] In this embodiment, the first side plate 1322 and the plate body 131 are used to enclose a receiving groove 1311 to accommodate a portion of the connecting body 132 bent toward one side of the center of the first opening 122 and a portion of the shell 120 bent toward one side of the center of the first opening 122. That is, the receiving groove 1311 provides space for the connecting body 132 and the shell 120 to bend, so as to facilitate processing and manufacturing.

[0049] Furthermore, an upsetting process is used to bend the first side plate 1322 , the second side plate 1323 , the top plate 1324 and the portion of the shell 120 inserted into the annular buckle groove 1321 toward one side of the center of the first opening 122 , and the connector 132 is welded to the portion of the shell 120 inserted into the annular buckle groove 1321 .

[0050] In this embodiment, on the basis of providing the annular buckle groove 1321, the first cover plate 130 and the shell 120 are further connected by combining the upsetting process and the welding process, thereby improving the connection strength between the first cover plate 130 and the shell 120, so that the structural strength and structural stability of the single battery 100 are further improved.

[0051] like Figure 4As shown, further, the connecting body 132 and the shell 120 inserted into the annular buckle groove 1321 are bent toward one side of the center of the first opening 122 at an angle α, satisfying: 0°≤α≤90°, so as to ensure that the connecting body 132 and the shell 120 have a sufficient degree of bending, thereby improving the connection strength between the first cover plate 130 and the shell 120.

[0052] Exemplarily, α may be selected from any value of 0°, 15°, 30°, 40°, 45°, 60°, 75°, 90°, or any value in a range consisting of any two of them.

[0053] Furthermore, the portion of the connector 132 bent toward the center of the first opening 122 abuts against the side of the plate 131 away from the battery cell 110. In this way, the plate 131 can support the bent portion, so that the first cover 130 and the housing 120 have a higher connection strength.

[0054] In addition, based on the abutment between the bent portion of the connector 132 and the plate 131, the connector 132 and the portion of the shell 120 inserted into the annular buckle groove 1321 can be welded together on the side of the plate 131 away from the battery cell 110 to further enhance the structural strength and stability of the single cell 100.

[0055] like Figure 4 As shown, of course, the portion of the connector 132 bent toward the center of the first opening 122 can also be spaced apart from the side of the plate 131 away from the battery cell 110, that is, the two are not in contact, and no specific restriction is made on the positional relationship between the connector 132 and the plate 131 after being bent.

[0056] like Figure 5 and Figure 7 As shown, in one embodiment, the annular buckle groove 1321 is annular, and the shell 120 is cylindrical, the outer diameter of the annular buckle groove 1321 is d1, the inner diameter of the annular buckle groove 1321 is d2, the outer diameter of the shell 120 is D1, and the inner diameter of the shell 120 is D2, satisfying: d1>D1, d2<D2.

[0057] In this embodiment, since the outer diameter d2 of the annular buckle groove 1321 is larger than the outer diameter D1 of the shell 120, and the inner diameter d2 of the annular buckle groove 1321 is smaller than the inner diameter D2 of the shell 120, there is a clearance fit between the annular buckle groove 1321 and the end of the shell 120 close to the first opening 122. In this way, the plate body 131 can freely fall into the accommodating cavity 121 during installation to support the battery cell 110 in a surface contact manner, so as to improve the safety of the single battery 100, and at the same time, it can further eliminate the assembly tolerance of the first cover plate 130 and the shell 120 in the height direction.

[0058] Of course, for the above embodiment, the annular buckle groove 1321 and the end of the shell 120 close to the first opening 122 may also be an interference fit, and no specific limitation is made on the matching method between the annular buckle groove 1321 and the shell 120.

[0059] It should be noted that, in addition to being cylindrical, the shell 120 can also be prismatic, such as a quadrangular prism, a pentagonal prism, a hexagonal prism, etc., and the annular buckle groove 1321 is an annular prism, such as an annular quadrangular prism, an annular pentagonal prism, an annular hexagonal prism, etc. Therefore, the method of the first cover plate 130 being buckled on the shell 120 using the annular buckle groove 1321 can be applied not only to cylindrical batteries and button batteries, but also to polygonal batteries such as square batteries and hexagonal batteries.

[0060] like Figure 6 As shown, in one embodiment, the height of the outer edge of the annular buckle groove 1321 relative to the bottom wall of the annular buckle groove 1321 is h1, and the height of the inner edge of the annular buckle groove 1321 relative to the bottom wall of the annular buckle groove 1321 is h2, satisfying: h2≥h1.

[0061] In this embodiment, by making the inner edge height of the annular buckle groove 1321 greater than or equal to the outer edge height of the annular buckle groove 1321, after the connecting body 132 and the shell 120 are subsequently bent toward one side of the center of the first opening 122, the connecting body 132 can be prevented from protruding from the outer wall of the shell 120 to form burrs, thereby reducing the generation of burrs on the outer wall of the shell 120.

[0062] Of course, for the above embodiment, h2 may be less than h1, that is, the inner edge height of the annular buckle groove 1321 is less than the outer edge height of the annular buckle groove 1321. No specific restriction is made on the relationship between the outer edge height and the inner edge height of the annular buckle groove 1321.

[0063] like Figure 1 , Figure 3 and Figure 7 As shown, in one embodiment, the single battery 100 further includes a second cover plate 150, a second current collecting disk 160 and a positive electrode column 170, the shell 120 has a second opening 123 connected to the accommodating cavity 121, the second opening 123 and the first opening 122 are arranged opposite to each other, the second cover plate 150 is sealed at the second opening 123, the second current collecting disk 160 is arranged in the accommodating cavity 121, one side of the second current collecting disk 160 is electrically connected to the side of the battery cell 110 facing the second opening 123, the positive electrode column 170 is penetrated by the second cover plate 150, and is electrically connected to the side of the second current collecting disk 160 away from the battery cell 110.

[0064] In this embodiment, the positive electrode column 170 is electrically connected to the battery cell 110 through the second current collecting plate 160 to serve as the positive electrode of the single battery 100 , and the first cover plate 130 is electrically connected to the battery cell 110 through the first current collecting plate 140 to serve as the negative electrode of the single battery 100 .

[0065] In another embodiment, the first cover plate 130 and the first current collecting disk 140 are insulated by an insulating member, the single battery 100 further includes a second cover plate 150, a second current collecting disk 160 and a positive electrode column 170, the shell 120 has a second opening 123 connected to the accommodating cavity 121, the second opening 123 and the first opening 122 are arranged opposite to each other, the positive electrode column 170 is penetrated by the first cover plate 130, and is electrically connected to the side of the first current collecting disk 140 away from the battery cell 110, the second cover plate 150 is sealed at the second opening 123, the second current collecting disk 160 is arranged in the accommodating cavity 121, one side of the second current collecting disk 160 is electrically connected to the side of the battery cell 110 facing the second opening 123, and the second cover plate 150 is electrically connected to the side of the second current collecting disk 160 away from the battery cell 110.

[0066] In this embodiment, the positive electrode column 170 is electrically connected to the battery cell 110 through the first current collecting plate 140 to serve as the positive electrode of the single battery 100. At this time, the first cover plate 130 provides support for the positive electrode column 170, and the second cover plate 150 is electrically connected to the battery cell 110 through the second current collecting plate 160 to serve as the negative electrode of the single battery 100.

[0067] It should be noted that, in addition to the first cover plate 130 , the second cover plate 150 may also adopt the annular buckle groove 1321 , so that the second cover plate 150 is buckled on the end of the shell 120 close to the second opening 123 through the annular buckle groove 1321 , thereby realizing the connection between the second cover plate 150 and the shell 120 .

[0068] An embodiment of the present application further provides a battery pack, including a battery box and a single battery 100 in any of the above embodiments, wherein the single battery 100 is disposed in the battery box.

[0069] The embodiment of the present application further provides an electric device, including the battery pack in the above embodiment. The electric device is, for example, an electric car, an energy storage power station, a ship, a spacecraft, etc.

[0070] It is understandable that, since the electrical device and the battery pack both have the single cell 100 in any of the above embodiments, they have all the beneficial effects of the single cell 100, which will not be elaborated here.

[0071] In order to better illustrate the beneficial effects of the embodiments of the present application, some embodiments are provided below for illustration, and the following table is specifically referred to:

[0072] Serial number <![CDATA[d1]]> <![CDATA[d2]]> <![CDATA[D1]]> <![CDATA[D2]]> <![CDATA[h1]]> <![CDATA[h2]]> Sealing yield Example 1 46.5mm 44.7mm 46mm 45.2mm 1.7mm 2.5mm 99％ Example 2 46.4mm 44.8mm 46mm 45.2mm 1.5mm 2.5mm 97％ Example 3 46.3mm 44.9mm 46mm 45.2mm 1.2mm 2.5mm 95％ Example 4 46.3mm 44.9mm 46mm 45.2mm 1.7mm 1.7mm 93％ Example 5 40.5mm 38.7mm 40mm 39.2mm 1.7mm 2.5mm 99％ Example 6 40.4mm 38.8mm 40mm 39.2mm 1.5mm 2.5mm 97％ Example 7 40.3mm 38.9mm 40mm 39.2mm 1.2mm 2.5mm 95％ Example 8 46.5mm 44.7mm 46mm 45.2mm 2.5mm 1.7mm 90％ Example 9 46.4mm 44.8mm 46mm 45.2mm 2.5mm 1.5mm 90％

[0073] In each of the above embodiments, 100 single cells 100 are provided respectively. After sealing, leakage is detected. If no leakage occurs, the sealing is good. If the sealing yield reaches 90%, it is considered qualified. It can be seen from the table that the experimental results of different embodiments all meet the requirements, and the yield is higher when h2≥h1.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A single cell battery, characterized in that: include: Battery cell (110); A housing (120) having a housing cavity (121) and a first opening (122) communicating with the housing cavity (121), wherein the battery cell (110) is arranged in the housing cavity (121); The first cover plate (130) comprises a plate body (131) and a connector (132), wherein the connector (132) is connected to the outer peripheral side of the plate body (131), the plate body (131) is located in the accommodating cavity (121) and covers the first opening (122), the connector (132) is provided with an annular buckle groove (1321), the notch of the annular buckle groove (1321) is arranged toward one side of the battery cell (110), and the end of the shell (120) close to the first opening (122) is inserted into the annular buckle groove (1321) to achieve the connection between the first cover plate (130) and the shell (120).

2. The single cell according to claim 1, characterized in that: The connecting body (132) comprises a first side plate (1322), a second side plate (1323) and a top plate (1324), wherein the first side plate (1322) is connected to the plate body (131), the top plate (1324) is connected to a side of the first side plate (1322) away from the plate body (131), the second side plate (1323) is connected to a side of the top plate (1324) away from the first side plate (1322), and the first side plate (1322) is connected to the plate body (131). 322), the second side plate (1323) and the top plate (1324) are enclosed to form the annular buckle groove (1321), and the first side plate (1322), the second side plate (1323), the top plate (1324) and the portion of the shell (120) inserted into the annular buckle groove (1321) are bent toward one side of the center of the first opening (122) to achieve a sealed connection between the first cover plate (130) and the shell (120).

3. The single cell according to claim 2, characterized in that: The single cell battery further comprises a first current collecting plate (140) arranged in the accommodating cavity (121); one side of the first current collecting plate (140) is electrically connected to a side of the battery cell (110) facing the first opening (122); and the plate body (131) is supported on a side of the first current collecting plate (140) facing away from the battery cell (110) in a surface contact manner.

4. The single cell according to claim 2, characterized in that: The first side plate (1322) extends in a direction away from the battery cell (110) so that the first side plate (1322) and the plate body (131) enclose a receiving groove (1311), and the receiving groove (1311) is used to accommodate a portion of the connecting body (132) bent toward one side of the center of the first opening (122) and a portion of the shell (120) bent toward one side of the center of the first opening (122).

5. The single cell according to claim 2, characterized in that: The portion of the connector (132) bent toward the center of the first opening (122) abuts against a side of the plate (131) facing away from the battery core (110).

6. The single cell according to any one of claims 1 to 5, characterized in that: The annular buckle groove (1321) is annular, and the shell (120) is cylindrical. The outer diameter of the annular buckle groove (1321) is d1, the inner diameter of the annular buckle groove (1321) is d2, the outer diameter of the shell (120) is D1, and the inner diameter of the shell (120) is D2, satisfying the following conditions: d1>D1, d2<D2.

7. The single cell according to any one of claims 1 to 5, characterized in that: The height of the outer edge of the annular buckle groove (1321) relative to the bottom wall of the annular buckle groove (1321) is h1, and the height of the inner edge of the annular buckle groove (1321) relative to the bottom wall of the annular buckle groove (1321) is h2, satisfying: h2≥h1.

8. The single cell according to any one of claims 1 to 5, characterized in that: The single cell battery further comprises a second cover plate (150), a second current collecting plate (160) and a positive electrode column (170); the shell (120) has a second opening (123) communicating with the accommodating cavity (121); the second opening (123) and the first opening (122) are arranged opposite to each other; the second cover plate (150) is sealed at the second opening (123); the second current collecting plate (160) is arranged in the accommodating cavity (121); one side of the second current collecting plate (160) is electrically connected to a side of the battery cell (110) facing the second opening (123); the positive electrode column (170) is arranged through the second cover plate (150) and is electrically connected to a side of the second current collecting plate (160) facing away from the battery cell (110).

9. A battery pack, characterized in that: A single cell comprising the single cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.

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