Single battery, battery pack and power utilization device

Abstract

The utility model discloses a single battery, a battery pack and an electric device, and relates to the field of batteries. The single battery has a first direction, a second direction and a third direction which are intersected in pairs, the single battery comprises a shell, a top cover assembly and an electrode assembly, the shell is provided with a containing cavity with an opening, the top cover assembly covers the opening, the electrode assembly is arranged in the containing cavity, and the top cover assembly comprises a top cover and an insulating part. The top cover extends along a first direction; the insulating part extends in the first direction and is arranged on the side, close to the shell in the third direction, of the top cover, the side, away from the top cover, of the insulating part is provided with a protruding part in a protruding mode, the protruding part is used for abutting against the electrode assembly, the side, away from the protruding part, of the insulating part is provided with a plurality of grooves, and the grooves are formed in the second direction at intervals. A first reinforcing rib is arranged in the groove and connected with the groove wall of the groove. According to the single battery provided by the invention, the energy density of the single battery is effectively improved, and the stability and the reliability of electric connection between the tabs and the pole columns are guaranteed.

Description

Technical Field

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

[0002] With the continuous development of the new energy vehicle industry, the requirements for battery energy density and safety of new energy vehicles are becoming increasingly higher.

[0003] In related technologies, a single battery cell generally includes a casing and a battery cell housed within the casing. The casing includes a housing and a top cover assembly, with terminals on the top cover assembly. The battery cell is electrically connected to the terminals via tabs. The top cover assembly includes a top cover sheet and a lower plastic component. The lower plastic component isolates the top cover sheet from the battery cell to prevent short circuits and also presses and limits the battery cell to prevent it from moving within the casing and causing the electrical connection between the tabs and terminals to fail.

[0004] To enhance the strength of the lower plastic component in pressing and restraining the battery cell, a boss is typically provided on the side of the lower plastic component closest to the battery cell to press it down. However, the presence of the boss increases the weight of the lower plastic component, which in turn affects the energy density of the individual battery cells. Utility Model Content

[0005] In order to achieve the above objectives, this application aims to provide a single-cell battery that solves the technical problem in the prior art where, in order to improve the strength of the lower plastic part in pressing and limiting the cell, a protrusion for pressing the cell is provided on the side of the lower plastic part near the cell, which increases the weight of the lower plastic part and affects the energy density of the single-cell battery.

[0006] The technical solution adopted is as follows:

[0007] In a first aspect, embodiments of this application provide a single-cell battery having intersecting first, second, and third directions, characterized in that the single-cell battery includes a housing, a top cover assembly, and an electrode assembly; the housing is provided with an opening in a receiving cavity; the top cover assembly seals the opening; and the electrode assembly is disposed within the receiving cavity. The top cover assembly includes:

[0008] A top cover extending along the first direction, the top cover sealing the opening;

[0009] An insulating member extends along the first direction and is disposed on the side of the top cover near the housing along the third direction, and is located in the receiving cavity. The insulating member has a protruding portion on the side opposite to the top cover, the protruding portion being used to press against the electrode assembly. The insulating member has a plurality of grooves on the side opposite to the protruding portion, the plurality of grooves being spaced apart along the second direction. A first reinforcing rib is disposed in the groove, the first reinforcing rib being connected to the groove wall.

[0010] In one embodiment of the first aspect, the orthographic projection of the first reinforcing rib onto the insulating member is any one of a strip, a cross, or a star shape.

[0011] In one embodiment of the first aspect, the insulating member has a protruding portion on the side opposite to the top cover, the protruding portion being used to press against the electrode assembly, the protruding portion including a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion being respectively located at two opposite ends of the insulating member along the first direction, and the protruding portion being located between the first protruding portion and the second protruding portion;

[0012] The insulating component is provided with a second reinforcing rib and a third reinforcing rib on the side away from the top cover. The second reinforcing rib and the third reinforcing rib are spaced apart along the first direction. The second reinforcing rib is located between the first protrusion and the protrusion, and the third reinforcing rib is located between the second protrusion and the protrusion.

[0013] In one embodiment of the first aspect, the second reinforcing rib has a cross-sectional shape perpendicular to the third direction that is circular, semi-circular, elliptical, square, grid-shaped, cross-shaped, or star-shaped; and / or,

[0014] The third reinforcing rib has a cross-sectional shape perpendicular to the third direction that is any one of the following: circular, semi-circular, elliptical, square, grid, cross, or rice-shaped.

[0015] In one embodiment of the first aspect, the top cover assembly further includes a pole post, the pole post including a first body portion and a second body portion connected to each other, the top cover having a first mounting hole, the insulating member having a second mounting hole, the second body portion being disposed on the side of the insulating member opposite to the top cover, and the first body portion penetrating through the second mounting hole and the first mounting hole;

[0016] The insulating component has a fourth reinforcing rib on the side opposite to the top cover. The fourth reinforcing rib is located on the outer periphery of the second mounting hole, and the side of the second body portion near the insulating component abuts against the fourth reinforcing rib.

[0017] In one embodiment of the first aspect, the fourth reinforcing rib has a profile shape of any one of a circle, a semicircle, an ellipse, or a square in the cross section perpendicular to the third direction.

[0018] In one embodiment of the first aspect, a plurality of fourth reinforcing ribs are provided, and the plurality of fourth reinforcing ribs are spaced apart along the circumference of the second mounting hole.

[0019] In one embodiment of the first aspect, both the insulating member and the fourth reinforcing rib are provided with a heat-insulating coating on the side away from the top cover. The heat-insulating coating is located on the outer periphery of the second mounting hole, and the side of the second body portion near the insulating member is connected to the heat-insulating coating.

[0020] In one embodiment of the first aspect, the top cover assembly further includes a heat insulation member disposed on the side of the insulating member away from the top cover and located in the outer periphery of the first body portion, wherein the side of the second body portion near the insulating member abuts against the heat insulation member.

[0021] In one embodiment of the first aspect, the insulating member has a limiting groove on the side opposite to the top cover that is adapted to the shape of the second body portion.

[0022] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0023] Thirdly, embodiments of this application also provide an electrical device, including the battery pack described in the above embodiments.

[0024] The beneficial effects of this application are as follows: This application proposes a single-cell battery, which includes a housing, a top cover assembly, and an electrode assembly. The housing has an open receiving cavity, the top cover assembly seals the opening, and the electrode assembly is disposed within the receiving cavity. The top cover assembly includes a top cover extending along a first direction and an insulating member. The top cover seals the opening, and the insulating member is disposed on the side of the top cover along a third direction near the housing and located within the receiving cavity, thus isolating the top cover from the electrode assembly to avoid short circuits. The insulating member can also press and limit the electrode assembly to prevent the electrode assembly from moving within the housing and causing the electrical connection between the tab and the terminal post to fail. By providing a protrusion on the side of the insulating member opposite to the top cover for pressing the electrode assembly, the strength of the insulating member's pressing and limiting of the electrode assembly is improved, thereby ensuring the stability and reliability of the electrical connection between the tab and the terminal post.

[0025] By creating multiple grooves spaced apart along a second direction on the side of the insulating component away from the protrusion, the weight of the protrusion is reduced, thereby reducing the weight of the insulating component and increasing the energy density of the single cell. By providing a first reinforcing rib connected to the groove wall within the groove, the overall strength of the protrusion is maintained while reducing its weight, thanks to the reinforcement effect of the first reinforcing rib. This ensures the strength of the insulating component in pressing and limiting the electrode assembly, thus guaranteeing the stability and reliability of the electrical connection between the tab and the electrode post. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A perspective view of the top cover assembly in some embodiments of this application is shown;

[0028] Figure 2 An exploded view of the top cover assembly in some embodiments of this application is shown. Figure 1 ;

[0029] Figure 3 This application shows a perspective view of the insulating element in some embodiments. Figure 1 ;

[0030] Figure 4 This application shows a perspective view of the insulating element in some embodiments. Figure 2 ;

[0031] Figure 5 This application shows a perspective view of the insulating element in some embodiments. Figure 3 ;

[0032] Figure 6 This application shows a perspective view of the insulating element in some embodiments. Figure 1 ;

[0033] Figure 7 This application shows a perspective view of the insulating element in some embodiments. Figure 2 ;

[0034] Figure 8 This application shows a perspective view of the insulating element in some embodiments. Figure 3 ;

[0035] Figure 9This application shows a perspective view of the insulating element in some embodiments. Figure 4 ;

[0036] Figure 10 This application shows a perspective view of the insulating element in some embodiments. Figure 5 ;

[0037] Figure 11 This application shows a perspective view of the insulating element in some embodiments. Figure 6 ;

[0038] Figure 12 An exploded view of the top cover assembly in some embodiments of this application is shown. Figure 2 ;

[0039] Figure 13 A perspective view of a single cell in some embodiments of this application is shown;

[0040] Figure 14 An exploded schematic diagram of a single cell in some embodiments of this application is shown.

[0041] Explanation of key component symbols:

[0042] 1000-cell battery;

[0043] 100 - Top cover assembly; 110 - Top cover; 111 - First mounting hole; 120 - Insulator; 121 - Protrusion; 1211 - Groove; 1212 - First protrusion; 1213 - Second protrusion; 122 - First reinforcing rib; 123 - Second reinforcing rib; 124 - Third reinforcing rib; 125 - Second mounting hole; 126 - Fourth reinforcing rib; 127 - Heat insulation coating; 128 - Protrusion; 129 - Limiting groove; 130 - Pole post; 131 - First body part; 132 - Second body part; 140 - Heat insulation component;

[0044] 200 - Housing; 210 - Opening; 220 - Receiving cavity;

[0045] 300-Electrode Assembly;

[0046] X - First direction;

[0047] Y - Second direction;

[0048] Z - Third-party orientation. Detailed Implementation

[0049] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] like Figure 1 , Figure 2 , Figure 13 and Figure 14 As shown, an embodiment of this application provides a single-cell battery 1000, mainly used in battery packs, which are primarily used in electrical devices. The single-cell battery 1000 has intersecting first directions X, second directions Y, and a third direction Z. The single-cell battery 1000 includes a housing 200, a top cover assembly 100, and an electrode assembly 300. The housing 200 has a receiving cavity 220 with an opening 210. The top cover assembly 100 covers the opening 210, and the electrode assembly 300 is disposed within the receiving cavity 220. The top cover assembly 100 includes a top cover 110 and an insulating member 120.

[0055] See also Figure 3 and Figure 4 The top cover 110 extends along the first direction X and seals the opening 210. The insulating member 120 extends along the first direction X and is disposed on the side of the top cover 110 along the third direction Z close to the housing 200, and is located in the receiving cavity 220. The insulating member 120 has a protruding part 121 on the side opposite to the top cover 110. The protruding part 121 is used to press against the electrode assembly 300. The insulating member 120 has a plurality of grooves 1211 on the side opposite to the protruding part 121. The plurality of grooves 1211 are spaced apart along the second direction Y. A first reinforcing rib 122 is disposed in the groove 1211 and the first reinforcing rib 122 is connected to the groove wall of the groove 1211.

[0056] The single-cell battery 1000 provided in the embodiments of this application includes a top cover assembly 100 comprising a top cover 110 and an insulating member 120 both extending along a first direction X. The top cover 110 seals the opening 210. The insulating member 120 is disposed on the side of the top cover 110 along a third direction Z, closer to the housing 200, and located in the receiving cavity 220, thereby isolating the top cover 110 from the electrode assembly 300 to avoid short circuits. The insulating member 120 can also press and limit the electrode assembly 300 to prevent the electrode assembly 300 from moving within the housing 200 and causing the electrical connection between the tab and the terminal 130 to fail. By providing a protrusion 121 for pressing the electrode assembly 300 on the side of the insulating member 120 opposite to the top cover 110, the strength of the insulating member 120 in pressing and limiting the electrode assembly 300 is improved, thereby ensuring the stability and reliability of the electrical connection between the tab and the terminal 130.

[0057] By creating multiple grooves 1211 spaced along the second direction Y on the side of the insulating member 120 away from the protrusion 121, the weight of the protrusion 121 is reduced, thereby reducing the weight of the insulating member 120 and increasing the energy density of the single cell 1000. By providing a first reinforcing rib 122 connected to the groove wall within the groove 1211, the weight of the protrusion 121 is reduced while the overall strength of the protrusion 121 is maintained through the reinforcing effect of the first reinforcing rib 122. This ensures the strength of the insulating member 120 in pressing and limiting the electrode assembly 300, and thus ensures the stability and reliability of the electrical connection between the tab and the post 130.

[0058] For example, the electrode assembly 300 can be a wound core or a stacked core, and the insulating part 120, the protrusion 121, the groove 1211 and the first reinforcing rib 122 can be integrally injection molded from plastic material.

[0059] For example, such as Figure 4 and Figure 5 As shown, in one embodiment of this application, the outline shape of the first reinforcing rib 122 in the cross section perpendicular to the third direction Z is any one of strip, cross, or star shape. The specific design can be made according to the actual needs of the product, and will not be listed here.

[0060] like Figure 6 As shown, in one embodiment of this application, the insulating member 120 has a protruding portion 128 on the side opposite to the top cover 110. The protruding portion 128 is used to press against the electrode assembly 300. The protruding portion 121 includes a first protruding portion 1212 and a second protruding portion 1213. The first protruding portion 1212 and the second protruding portion 1213 are respectively located at two opposite ends of the insulating member 120 along the first direction X. The protruding portion 128 is located between the first protruding portion 1212 and the second protruding portion 1213. Thus, under the joint pressure of the protruding portion 128, the first protruding portion 1212 and the second protruding portion 1213 on the electrode assembly 300, the strength of the insulating member 120 in pressing and limiting the electrode assembly 300 can be further improved, thereby further improving the stability and reliability of the electrical connection between the tab and the post 130.

[0061] The insulating component 120 is provided with a second reinforcing rib 123 and a third reinforcing rib 124 on the side opposite to the top cover 110. The second reinforcing rib 123 and the third reinforcing rib 124 are spaced apart along the first direction X. The second reinforcing rib 123 is located between the first protrusion 1212 and the protrusion 128, and the third reinforcing rib 124 is located between the second protrusion 1213 and the protrusion 128.

[0062] In this embodiment, a second reinforcing rib 123 is provided on the side of the insulating member 120 away from the top cover 110, located between the first protrusion 1212 and the protrusion 128, to resist shrinkage deformation generated during the injection molding process of the insulating member 120, and to further improve the overall strength of the insulating member 120. Simultaneously, a third reinforcing rib 124 is provided on the side of the insulating member 120 away from the top cover 110, located between the second protrusion 1213 and the protrusion 128, to further resist shrinkage deformation generated during the injection molding process of the insulating member 120, and to further improve the overall strength of the insulating member 120.

[0063] For example, such as Figure 6 , Figure 7 and Figure 8 As shown in one embodiment of this application, the outline shape of the second reinforcing rib 123 in the cross-section perpendicular to the third direction Z is any one of a circle, semi-circle, ellipse, square, grid, cross, or star shape. The specific design can be tailored to the actual product requirements, and will not be listed here. Similarly, the outline shape of the third reinforcing rib 124 in the cross-section perpendicular to the third direction Z is any one of a circle, semi-circle, ellipse, square, grid, cross, or star shape. The specific design can be tailored to the actual product requirements, and will not be listed here.

[0064] It should be noted that the second reinforcing rib 123 and the third reinforcing rib 124 can have the same shape to simplify the structure of the insulating component 120, thereby facilitating manufacturing and reducing production costs. The second reinforcing rib 123 and the third reinforcing rib 124 can also have different shapes to prevent mistaken identity, thereby facilitating the assembly personnel to quickly and accurately assemble the top cover assembly 100 onto the housing 200.

[0065] like Figure 12 As shown, in one embodiment of this application, the top cover assembly 100 further includes an electrode post 130. The electrode post 130 includes a first body portion 131 and a second body portion 132 connected to each other. The top cover 110 has a first mounting hole 111, and the insulating member 120 has a second mounting hole 125. The second body portion 132 is disposed on the side of the insulating member 120 opposite to the top cover 110. The first body portion 131 passes through the second mounting hole 125 and the first mounting hole 111. Thus, the electrode assembly 300 can be charged and discharged through the electrode post 130.

[0066] See also Figure 9The insulating member 120 is provided with a fourth reinforcing rib 126 on the side opposite to the top cover 110. The fourth reinforcing rib 126 is located on the outer periphery of the second mounting hole 125. The side of the second body part 132 near the insulating member 120 abuts against the fourth reinforcing rib 126.

[0067] In this embodiment, a fourth reinforcing rib 126 is provided on the side of the insulating member 120 facing away from the top cover 110, located on the outer periphery of the second mounting hole 125, and the side of the second body portion 132 near the insulating member 120 abuts against the fourth reinforcing rib 126. This enhances the strength of the contact point between the insulating member 120 and the second body portion 132, thereby improving the installation stability and reliability of the pole post 130. Furthermore, the presence of the fourth reinforcing rib 126 reduces the probability that the insulating member 120 will melt due to temperature rise during charging and discharging.

[0068] For example, such as Figure 9 As shown, in one embodiment of this application, the fourth reinforcing rib 126 has a profile shape of any one of circular, semi-circular, elliptical or square in the cross section perpendicular to the third direction Z. The specific design can be made according to the actual needs of the product, and will not be listed here.

[0069] For example, such as Figure 10 As shown, in one embodiment of this application, multiple fourth reinforcing ribs 126 are provided, and the multiple fourth reinforcing ribs 126 are spaced apart along the circumference of the second mounting hole 125 to further improve the installation stability and reliability of the pole post 130 and further reduce the probability that the second body part 132 will melt the insulating part 120 due to the temperature rise during the charging and discharging process.

[0070] like Figure 10 and Figure 11 As shown, in one embodiment of this application, the insulating member 120 and the fourth reinforcing rib 126 are both provided with a heat insulation coating 127 on the side away from the top cover 110. The heat insulation coating 127 is located on the outer periphery of the second mounting hole 125, and the side of the second body part 132 near the insulating member 120 is connected to the heat insulation coating 127.

[0071] In this embodiment, by providing a heat-insulating coating 127 on the outer periphery of the second mounting hole 125 on both the insulating member 120 and the fourth reinforcing rib 126 on the side away from the top cover 110, and connecting the side of the second body part 132 close to the insulating member 120 to the heat-insulating coating 127, the probability of the second body part 132 melting the insulating member 120 due to temperature rise during charging and discharging is effectively reduced under the heat insulation effect of the heat-insulating coating 127.

[0072] like Figure 12 As shown, in one embodiment of this application, the top cover assembly 100 further includes a heat insulation member 140, which is disposed on the side of the insulating member 120 away from the top cover 110 and located on the outer periphery of the first body portion 131. The side of the second body portion 132 near the insulating member 120 abuts against the heat insulation member 140.

[0073] In this embodiment, by providing a heat insulation member 140 on the side of the insulating member 120 away from the top cover 110, located on the outer periphery of the first body part 131, and by having the side of the second body part 132 close to the insulating member 120 abut against the heat insulation member 140, the probability of the second body part 132 melting the insulating member 120 due to temperature rise during charging and discharging is effectively reduced under the heat insulation effect of the heat insulation member 140.

[0074] For example, the insulation element 140 can be made of insulation materials such as mica or ceramic.

[0075] like Figure 11 As shown, in one embodiment of this application, the insulating member 120 has a limiting groove 129 on the side opposite to the top cover 110 that is adapted to the shape of the second body part 132.

[0076] In this embodiment, by opening a limiting groove 129 on the side of the insulating member 120 away from the top cover 110 that matches the shape of the second body part 132, the second body part 132 can be restricted from moving under the limiting action of the limiting groove 129. In addition, the limiting groove 129 can also act as a reinforcing rib, effectively improving the installation stability and reliability of the pole post 130.

[0077] Embodiments of this application also provide a battery pack, including the single cell 1000 in any of the above embodiments.

[0078] The battery pack has the single cell 1000 in any of the above embodiments, and therefore has all the beneficial effects of the single cell 1000, which will not be described in detail here.

[0079] The battery pack has a housing and at least one individual battery cell 1000 as described in any of the above embodiments, the individual battery cell 1000 being disposed within the housing. When there are multiple individual batteries cell 1000, the multiple individual batteries cell 1000 can be connected in series or in parallel, or in a combination of series and parallel connections.

[0080] Embodiments of this application also provide an electrical device, including the battery pack described in the above embodiments.

[0081] The electrical device has the battery pack described in the above embodiments, and therefore has all the beneficial effects of the battery pack, which will not be elaborated here.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-cell battery, said single-cell battery (1000) having a first direction (X), a second direction (Y), and a third direction (Z) intersecting each other in pairs, characterized in that, The single-cell battery (1000) includes a housing (200), a top cover assembly (100), and an electrode assembly (300). The housing (200) has a receiving cavity (220) with an opening (210). The top cover assembly (100) covers the opening (210). The electrode assembly (300) is disposed within the receiving cavity (220). The top cover assembly (100) includes: A top cover (110) extends along the first direction (X) and the top cover (110) covers the opening (210); An insulating member (120) extends along the first direction (X) and is disposed on the side of the top cover (110) along the third direction (Z) near the housing (200) and located in the receiving cavity (220). The insulating member (120) has a protrusion (121) on the side away from the top cover (110). The protrusion (121) is used to press against the electrode assembly (300). The insulating member (120) has a plurality of grooves (1211) on the side away from the protrusion (121). The plurality of grooves (1211) are spaced apart along the second direction (Y). A first reinforcing rib (122) is disposed in the groove (1211) and the first reinforcing rib (122) is connected to the groove wall of the groove (1211).

2. The single-cell battery according to claim 1, characterized in that, The first reinforcing rib (122) has a profile shape of any one of strip, cross, or star shape in the cross section perpendicular to the third direction (Z).

3. The single-cell battery according to claim 1, characterized in that, The insulating member (120) has a protruding portion (128) on the side opposite to the top cover (110). The protruding portion (128) is used to press against the electrode assembly (300). The protruding portion (121) includes a first protruding portion (1212) and a second protruding portion (1213). The first protruding portion (1212) and the second protruding portion (1213) are respectively located at two opposite ends of the insulating member (120) along the first direction (X). The protruding portion (128) is located between the first protruding portion (1212) and the second protruding portion (1213). The insulating member (120) is provided with a second reinforcing rib (123) and a third reinforcing rib (124) on the side away from the top cover (110). The second reinforcing rib (123) and the third reinforcing rib (124) are spaced apart along the first direction (X). The second reinforcing rib (123) is located between the first protrusion (1212) and the protrusion (128), and the third reinforcing rib (124) is located between the second protrusion (1213) and the protrusion (128).

4. The single-cell battery according to claim 3, characterized in that, The second reinforcing rib (123) has a profile shape in a cross section perpendicular to the third direction (Z) that is circular, semi-circular, elliptical, square, grid, cross, or star-shaped; and / or, The third reinforcing rib (124) has a profile shape in the cross section perpendicular to the third direction (Z) that is any one of a circle, a semicircle, an ellipse, a square, a grid, a cross, or a rice-shaped.

5. The single-cell battery according to any one of claims 1 to 4, characterized in that, The top cover assembly (100) further includes a pole post (130), the pole post (130) includes a first body part (131) and a second body part (132) connected to each other, the top cover (110) has a first mounting hole (111), the insulating member (120) has a second mounting hole (125), the second body part (132) is disposed on the side of the insulating member (120) away from the top cover (110), and the first body part (131) passes through the second mounting hole (125) and the first mounting hole (111); The insulating member (120) has a fourth reinforcing rib (126) on the side away from the top cover (110). The fourth reinforcing rib (126) is located on the outer periphery of the second mounting hole (125). The side of the second body part (132) near the insulating member (120) abuts against the fourth reinforcing rib (126).

6. The single-cell battery according to claim 5, characterized in that, The fourth reinforcing rib (126) has a profile shape of any one of circular, semi-circular, elliptical or square in the cross section perpendicular to the third direction (Z).

7. The single-cell battery according to claim 5, characterized in that, Multiple fourth reinforcing ribs (126) are provided, and the multiple fourth reinforcing ribs (126) are spaced apart along the circumference of the second mounting hole (125).

8. The single-cell battery according to claim 5, characterized in that, Both the insulating component (120) and the fourth reinforcing rib (126) are provided with a heat-insulating coating (127) on the side away from the top cover (110). The heat-insulating coating (127) is located on the outer periphery of the second mounting hole (125). The side of the second body part (132) near the insulating component (120) is connected to the heat-insulating coating (127).

9. The single-cell battery according to claim 5, characterized in that, The top cover assembly (100) further includes a heat insulation member (140), which is disposed on the side of the insulating member (120) away from the top cover (110) and located on the outer periphery of the first body portion (131). The side of the second body portion (132) near the insulating member (120) abuts against the heat insulation member (140).

10. The single-cell battery according to claim 5, characterized in that, The insulating member (120) has a limiting groove (129) on the side opposite to the top cover (110) that is adapted to the shape of the second body part (132).

11. A battery pack, characterized in that, Includes the single cell (1000) according to any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the battery pack as described in claim 11.

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