A single cell and a battery pack

Abstract

The application discloses a single battery and a battery pack, and relates to the technical field of new energy batteries. The single battery has a first direction and a second direction which are perpendicular to each other. The lower plastic of the single battery comprises: a body structure having a first side facing an electrode assembly; a first boss and a second boss protrudingly arranged on the first side, the first boss being located at the middle of the body structure along the first direction and abutting against one side of the electrode assembly facing a top cover, and the second boss being located at the end of the body structure along the first direction; along the second direction, the size H2 of the second boss is smaller than the thickness size H1 of the first boss; and at least one supporting boss protrudingly arranged on one side of the second boss away from the body structure and abutting against one side of the electrode assembly facing the top cover, the size H3 of the supporting boss along the second direction satisfying H3+H2=H1. The single battery provided by the application can realize the lightweight of the lower plastic while ensuring the structural strength of the lower plastic.

Description

Technical Field

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

[0002] In new energy batteries, the lower plastic layer can provide insulation, support, cushioning, and shock absorption between the electrode structure and the top cover structure.

[0003] In related technologies, the lower plastic layer has insufficient structural strength, which affects the long-term stability of the internal electrode structure of new energy batteries. Utility Model Content

[0004] This application provides a single-cell battery and a battery pack that achieves lightweighting of the lower plastic while ensuring the structural strength of the lower plastic.

[0005] This application provides a single-cell battery having a first direction and a second direction perpendicular to each other. The single-cell battery includes a housing, a top cover, an electrode assembly, and a lower plastic layer. The electrode assembly is disposed in a cavity formed by the housing and the top cover. The lower plastic layer is disposed on the side of the top cover facing the electrode assembly. The lower plastic layer includes: The body structure has a first side facing the electrode assembly; A first protrusion is provided on the first side and located in the middle of the body structure along the first direction. The first protrusion abuts against the side of the electrode assembly facing the top cover. The second boss protrudes from the first side and is located at the end of the body structure along the first direction. The dimension H2 of the second boss along the second direction is smaller than the thickness H1 of the first boss along the second direction. At least one support boss protrudes from the side of the second boss away from the body structure and abuts against the side of the electrode assembly facing the top cover. The dimension H3 of the support boss along the second direction satisfies H3+H2=H1.

[0006] In some possible implementations, the body structure includes a first side perpendicular to the first direction, and the support boss has an outer wall surface; Along the second direction, the projection of the outer wall surface of at least one of the supporting bosses onto the body structure falls into the first side.

[0007] In some possible implementations, the body structure includes a first side perpendicular to the first direction and a second side adjacent to the first side, and the support boss has an outer wall surface; The second boss has at least two supporting bosses protruding from the side opposite to the main body structure; along the second direction, the projection of the outer wall surface of a portion of the supporting boss onto the main body structure falls into the first side, and the projection of the outer wall surface of a portion of the supporting boss onto the main body structure falls into the second side.

[0008] In some possible implementations, the body structure includes a first side perpendicular to the first direction and a second side and a third side adjacent to the first side, wherein the second side and the third side are parallel, and the support boss has an outer wall surface; The second boss has at least three supporting bosses protruding from the side opposite to the main body structure. Along the second direction, the projection of the outer wall surface of a portion of the supporting boss onto the main body structure falls into the first side, the projection of the outer wall surface of a portion of the supporting boss onto the main body structure falls into the second side, and the projection of the outer wall surface of a portion of the supporting boss onto the main body structure falls into the third side.

[0009] In some possible implementations, the support boss further has an inner wall surface opposite to the outer wall surface, and the inner wall surface is an inclined surface; The inner wall surface gradually slopes towards the outer wall surface from the end closest to the second protrusion to the end furthest from the second protrusion.

[0010] In some possible implementations, the supporting boss has a top surface on the side opposite to the second boss, the top surface being connected between the outer wall surface and the inner wall surface, and the top surface being configured as a plane or an arc surface.

[0011] In some possible implementations, the support boss further has an inner wall surface disposed opposite to the outer wall surface, the inner wall surface being configured as an arc surface.

[0012] In some possible implementations, the end of the inner wall surface away from the body structure is connected to the outer wall surface, and the connection is provided with rounded corners.

[0013] In some possible implementations, the second boss is further provided with a reinforcing rib on the side opposite to the main body structure, and the reinforcing rib is connected between at least two of the supporting bosses.

[0014] In addition, this application also provides a battery pack, including the single battery cells provided in the above embodiments.

[0015] The beneficial effects of this application are as follows: In the single-cell battery provided by this application, the position between the first and second protrusions in the body structure of the lower plastic can have a smaller thickness, which can achieve local thinning of the lower plastic 100, reduce the amount of material used in the lower plastic, achieve weight reduction of the lower plastic, and also reduce the cost of the lower plastic. In addition, a second protrusion is provided at the end of the body structure, and the dimension H2 of the second protrusion along the second direction is smaller than the dimension H1 of the first protrusion along the second direction. Therefore, while achieving thinning, the end position of the lower plastic along the first direction can have sufficient structural strength, ensuring the structural stability of the single-cell battery during long-term use. In this application, a support protrusion is provided on the side of the second protrusion away from the body structure. The support protrusion can cooperate with the first protrusion to provide stable and reliable support for the electrode assembly, ensuring the installation stability of the electrode assembly in the cavity. Attached Figure Description

[0016] 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.

[0017] Figure 1 A cross-sectional structural schematic diagram of a single cell is shown in some embodiments; Figure 2 Schematic diagrams of the structure of the lower plastic in some embodiments are shown; Figure 3 A partial cross-sectional structural diagram of the lower plastic is shown in some embodiments; Figure 4 A three-dimensional structural diagram of the lower plastic in some embodiments is shown; Figure 5 It shows Figure 4 A magnified schematic diagram of part A in the middle section; Figure 6 A three-dimensional structural diagram of the lower plastic is shown in some other embodiments; Figure 7 It shows Figure 6 A partially enlarged structural diagram of section B; Figure 8 A three-dimensional structural schematic diagram of the lower plastic is shown in some other embodiments; Figure 9 A schematic diagram of the structure of the plastic is shown in some embodiments.

[0018] Explanation of key component symbols: 100-Underlying plastic; 110 - Body structure; 1101 - First side; 1102 - Second side; 111 - First side edge; 112 - Second side edge; 113 - Third side edge; 114 - Through hole; 120 - First boss; 121 - Through hole; 130 - Second boss; 140 - Support boss; 141 - Inner wall surface; 142 - Outer wall surface; 143 - Rounded corner; 144 - Top surface; 150 - Reinforcing rib; 200 - Housing; 300 - Top cover; 400 - Electrode assembly; 500 - Cavity; X - First direction; Z - Second direction. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In related technologies, the lower plastic 100 is typically thinned or perforated to achieve its strength. However, these two methods can lead to insufficient local strength in the lower plastic 100, affecting the long-term structural stability of the single cell. The inventors of this application have discovered that the supporting load of the lower plastic 100 on the electrode assembly 400 is mainly concentrated at the ends of the lower plastic 100. Therefore, this invention provides a lower plastic 100 for use in a single cell that achieves weight reduction while ensuring structural strength.

[0025] Example 1 like Figures 1 to 3 As shown, the embodiment provides a single-cell battery, which may include a housing 200, a top cover 300, an electrode assembly 400, and a lower plastic 100. The top cover 300 covers the opening of the housing 200 and can be welded to the housing 200, with the top cover 300 and housing 200 forming a cavity 500. The electrode assembly 400 may be disposed within the cavity 500. The lower plastic 100 may be located on the side of the top cover 300 facing the electrode assembly 400. Additionally, the single-cell battery also has a first direction X and a second direction Z perpendicular to each other.

[0026] In some embodiments, the lower plastic 100 may include a body structure 110, a first boss 120, a second boss 130, and at least one support boss 140. The body structure 110 has a first side 1101 facing the electrode assembly 400. The first boss 120 and the second boss 130 both protrude from the first side 1101 of the body structure 110. The first boss 120 may be located at the middle of the body structure 110 along a first direction X, and the second boss 130 may be located at an end of the body structure 110 along the first direction X. The first boss 120 and the second boss 130 may be spaced apart along the first direction X. Furthermore, the dimension H2 of the second boss 130 along the second direction Z is smaller than the dimension H1 of the first boss 120 along the second direction Z.

[0027] In some embodiments, the lower plastic 100 may include two second protrusions 130, which may be disposed at two ends of the body structure 110 along the first direction X, that is, the two second protrusions 130 may be disposed on both sides of the first protrusion 120 along the first direction X, and the two second protrusions 130 may be symmetrically arranged about the first protrusion 120.

[0028] In some embodiments, the support boss 140 may protrude from the side of the second boss 130 opposite to the body structure 110. The dimension H3 of the support boss 140 along the second direction Z can satisfy H3+H2=H1. Accordingly, the side of the support boss 140 opposite to the second boss 130 and the side of the first boss 120 opposite to the body structure 110 can be at the same height in the second direction Z. Furthermore, the side of the support boss 140 opposite to the second boss 130 and the side of the first boss 120 opposite to the body structure 110 can both abut against the side of the electrode assembly 400 facing the top cover 300, providing stable and reliable support for the electrode assembly 400. In some embodiments, each second boss 130 has a set of at least one support boss 140 protruding from the side opposite to the body structure 110.

[0029] In this embodiment, the position between the first protrusion 120 and the second protrusion 130 in the body structure 110 can have a smaller thickness (the dimension of the lower plastic 100 along the second direction Z), which allows for local thinning of the lower plastic 100, reducing the material usage of the lower plastic 100, achieving weight reduction, and also reducing the cost of the lower plastic 100. Furthermore, a second protrusion 130 is provided at the end of the body structure 110, and the dimension H2 of the second protrusion 130 along the second direction Z is smaller than the dimension H1 of the first protrusion 120 along the second direction Z. Therefore, while achieving thinning, the end position of the lower plastic 100 along the first direction X can have sufficient structural strength, ensuring the structural stability of the single battery cell during long-term use. In this application, a support protrusion 140 is provided on the side of the second protrusion 130 away from the body structure 110. The support protrusion 140 can cooperate with the first protrusion 120 to provide stable and reliable support for the electrode assembly 400, ensuring the installation stability of the electrode assembly 400 in the cavity 500.

[0030] Example 2 like Figures 1 to 3 , Figure 5 As shown, the embodiment provides a single-cell battery, which, based on embodiment one, further includes: In some embodiments, the body structure 110 further includes a second side 1102 opposite to the first side 1101, the second side 1102 being disposed toward the top cover 300.

[0031] In some embodiments, the first protrusion 120 may be disposed opposite to the explosion-proof valve on the top cover 300. The side of the first protrusion 120 facing the body structure 110 may be configured as a hollow structure, and the body structure 110 may have a through hole 114 connecting the first side 1101 and the second side 1102, and the through hole 114 may communicate with the interior of the first protrusion 120. In some embodiments, the first protrusion 120 may have a plurality of through holes 121, which may connect the space where the electrode assembly 400 is located and the interior of the first protrusion 120. When a single cell experiences thermal runaway or other situations, the gas generated in the space where the electrode assembly 400 is located can move towards the explosion-proof valve through the through holes 121 and the through holes 114, and be discharged outward through the explosion-proof valve to achieve a pressure relief function.

[0032] In some embodiments, the body structure 110 may include a first side 111 perpendicular to the first direction X. A second boss 130 protrudes from the side opposite to the body structure 110 and is provided with a support boss 140. The support boss 140 may be configured with an inner wall surface 141 and an outer wall surface 142 disposed opposite to each other. The projection of the outer wall surface 142 of the support boss 140 along the second direction Z onto the body structure 110 may fall into the first side 111.

[0033] In some embodiments, a Mylar sheet (not shown) may be arranged around the periphery of the electrode assembly 400. The Mylar sheet may protrude from the side of the electrode assembly 400 facing the lower plastic 100. In this embodiment, the support boss 140 may be used as a heat-fused structure, the support boss 140 may be inserted into the Mylar sheet along the second direction Z, and the outer wall surface 142 of the support boss 140 may be heat-fused to the Mylar sheet.

[0034] In other embodiments, the second boss 130 may also have two or three other support bosses 140 protruding from the side opposite to the main body structure 110. The projection of the outer wall surface 142 of each support boss 140 onto the main body structure 110 can fall into the first side 111. Furthermore, multiple support bosses 140 can provide support for the electrode assembly 400 and can be thermally fused to the Mylar sheet.

[0035] like Figures 2 to 5As shown, in some embodiments, the support boss 140 has a top surface 144 on the side opposite to the second boss 130, and the top surface 144 can be connected between the inner wall surface 141 and the outer wall surface 142. In embodiments, the top surface 144 can be configured as an arc surface or a plane. When the top surface 144 is configured as a plane, the connection between the plane and the inner wall surface 141 and the outer wall surface 142 of the support boss 140 is set as a rounded corner 143. On the one hand, the supporting load on the support boss 140 can be distributed to various parts of the support boss 140, reducing the probability of the support boss 140 bending due to the supporting load, and ensuring that the support boss 140 provides a stable and reliable support for the electrode assembly 400. On the other hand, it can prevent the support boss 140 from puncturing the electrode assembly 400 and causing damage to the electrode assembly 400.

[0036] Example 3 like Figures 4 to 6 As shown, this embodiment provides a single-cell battery, which differs from Embodiment 2 in the following ways: In some embodiments, the body structure 110 further includes a second side 112 adjacent to the first side 111, and the second side 112 may be parallel to the first direction X.

[0037] In this embodiment, at least two support bosses 140 protrude from the side of the second boss 130 away from the main body structure 110. Along the second direction Z, the projection of the outer wall surface 142 of part of the support boss 140 onto the main body structure 110 can fall into the first side 111, and the projection of the outer wall surface 142 of part of the support boss 140 onto the main body structure 110 can fall into the second side 112.

[0038] For example, in some embodiments, the second boss 130 may have two supporting bosses 140 protruding from the side opposite to the main body structure 110. The projection of the outer wall surface 142 of one of the supporting bosses 140 along the second direction Z onto the main body structure 110 may fall into the first side 111. The projection of the outer wall surface 142 of the other supporting boss 140 along the second direction Z onto the main body structure 110 may fall into the second side 112.

[0039] In other embodiments, the second boss 130 may also have three, four, or five supporting bosses 140 protruding from the side opposite to the main body structure 110. These supporting bosses 140 may be located at the first side 111 and the second side 112. Specifically, the projection of the outer wall surface 142 of a portion of the supporting bosses 140 along the second direction Z onto the main body structure 110 falls on the first side 111. The projection of the outer wall surface 142 of another portion of the supporting bosses 140 along the second direction Z onto the main body structure 110 falls on the second side 112.

[0040] like Figure 4 and Figure 5 As shown, in some embodiments, the inner wall surface 141 of the support boss 140 can be configured as an inclined surface, wherein the inner wall surface 141 and the outer wall surface 142 can be respectively disposed on opposite sides of the support boss 140. The inclined surface can gradually slope from the end near the second boss 130 to the end away from the second boss 130 towards the outer wall surface 142. This allows the end of the support boss 140 near the second boss 130 to have a larger cross-sectional area, which can be perpendicular to the second direction Z, reducing the possibility of the support boss 140 bending under the support load and ensuring the structural strength of the support boss 140, so as to provide stable and reliable support for the electrode assembly 400.

[0041] In some embodiments, the support boss 140 may have a top surface 144 on the side opposite to the second boss 130, and the top surface 144 may be connected between the inner wall surface 141 and the outer wall surface 142. In embodiments, the top surface 144 may be configured as an arc surface or a plane. When the top surface 144 is configured as a plane, the connection between the plane and the inner wall surface 141 and the outer wall surface 142 of the support boss 140 is set as a rounded corner 143 to avoid puncturing and damaging the electrode assembly 400.

[0042] like Figure 6 and Figure 7 As shown, in some embodiments, the inner wall surface 141 of the support boss 140 can be configured as an arc surface, which can protrude in a direction away from the outer wall surface 142. Furthermore, the end of the inner wall surface 141 away from the second boss 130 can be connected to the end of the outer wall surface 142 away from the second boss 130, and a fillet 143 is provided at the connection point. This allows the end of the support boss 140 near the second boss 130 to have a larger cross-sectional area, reducing the possibility of the support boss 140 bending under supporting loads, ensuring the structural strength of the support boss 140, and providing stable and reliable support for the electrode assembly 400. Simultaneously, it avoids puncture damage to the electrode assembly 400 caused by the support boss 140.

[0043] like Figure 6 As shown, in some embodiments, a reinforcing rib 150 protrudes from the side of the second boss 130 opposite to the main body structure 110, and the reinforcing rib 150 can be connected between at least two supporting bosses 140. This further enhances the structural strength of the lower plastic 100 at its end along the first direction X, providing stable and reliable support for the electrode assembly 400, ensuring the overall structural stability of the single cell, and reducing the probability of single cell failure.

[0044] In some embodiments, the reinforcing ribs 150 may be connected to each of the supporting bosses 140 respectively.

[0045] Example 4 like Figure 8 and Figure 9 As shown, this embodiment provides a single-cell battery, which differs from Embodiment 3 in the following ways: In some embodiments, the body structure 110 further includes a third side 113 adjacent to the first side 111, which may be parallel to and opposite to the second side 112. At least three support bosses 140 protrude from the side of the second boss 130 away from the body structure 110. The projection of the outer wall surface 142 of a portion of the support boss 140 along the second direction Z onto the body structure 110 may fall into the first side 111. The projection of the outer wall surface 142 of a portion of the support boss 140 along the second direction Z onto the body structure 110 may fall into the second side 112. The projection of the outer wall surface 142 of a portion of the support boss 140 along the second direction Z onto the body structure 110 may fall into the third side 113.

[0046] For example, in some embodiments, the second boss 130 has three supporting bosses 140 protruding from the side opposite to the main body structure 110. The projection of the outer wall surface 142 of one of the supporting bosses 140 along the second direction Z onto the main body structure 110 falls into the first side 111. The projection of the outer wall surface 142 of another supporting boss 140 along the second direction Z onto the main body structure 110 falls into the second side 112. The projection of the outer wall surface 142 of yet another supporting boss 140 along the second direction Z onto the main body structure 110 falls into the third side 113.

[0047] In other embodiments, the second boss 130 has four, five, or six supporting bosses 140 protruding from the side opposite to the main body structure 110. The projection of the outer wall surface 142 of a portion of the supporting bosses 140 onto the main body structure 110 along the second direction Z falls into the first side 111. The projection of the outer wall surface 142 of another portion of the supporting bosses 140 onto the main body structure 110 along the second direction Z falls into the second side 112. Yet another portion of the projection of the outer wall surface 142 of the supporting bosses 140 onto the main body structure 110 along the second direction Z falls into the third side 113.

[0048] The embodiment also provides a battery pack, which may include the individual battery cells provided in the embodiment.

[0049] 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.

[0050] 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, characterized in that, Having a first direction (X) and a second direction (Z) perpendicular to each other, the single cell includes a housing (200), a top cover (300), an electrode assembly (400), and a lower plastic (100). The electrode assembly (400) is disposed in a cavity (500) formed by the housing (200) and the top cover (300). The lower plastic (100) is disposed on the side of the top cover (300) facing the electrode assembly (400), and the lower plastic (100) includes: The body structure (110) has a first side (1101) facing the electrode assembly (400). The first boss (120) protrudes from the first side (1101) and is located in the middle of the body structure (110) along the first direction (X). The first boss (120) abuts against the side of the electrode assembly (400) facing the top cover (300). The second boss (130) protrudes from the first side (1101) and is located at the end of the body structure (110) along the first direction (X). The dimension H2 of the second boss (130) along the second direction (Z) is smaller than the thickness dimension H1 of the first boss (120) along the second direction (Z). At least one support boss (140) is provided on the side of the second boss (130) away from the body structure (110) and abuts against the side of the electrode assembly (400) facing the top cover (300). The dimension H3 of the support boss (140) along the second direction (Z) satisfies H3+H2=H1.

2. The single-cell battery according to claim 1, characterized in that, The body structure (110) includes a first side (111) perpendicular to the first direction (X), and the support boss (140) has an outer wall surface (142). Along the second direction (Z), the projection of the outer wall surface (142) of at least one of the support bosses (140) onto the body structure (110) falls into the first side (111).

3. The single-cell battery according to claim 1, characterized in that, The body structure (110) includes a first side (111) perpendicular to the first direction (X) and a second side (112) adjacent to the first side (111), and the support boss (140) has an outer wall surface (142). The second boss (130) has at least two supporting bosses (140) protruding from the side opposite to the main body structure (110); along the second direction (Z), the projection of the outer wall surface (142) of a portion of the supporting boss (140) onto the main body structure (110) falls into the first side (111), and the projection of the outer wall surface (142) of a portion of the supporting boss (140) onto the main body structure (110) falls into the second side (112).

4. The single-cell battery according to claim 1, characterized in that, The main body structure (110) includes a first side (111) perpendicular to the first direction (X) and a second side (112) and a third side (113) adjacent to the first side (111), and the second side (112) and the third side (113) are parallel, and the support boss (140) has an outer wall surface (142). The second boss (130) has at least three supporting bosses (140) protruding from the side opposite to the main body structure (110). Along the second direction (Z), the projection of the outer wall surface (142) of a portion of the supporting boss (140) onto the main body structure (110) falls into the first side (111), the projection of the outer wall surface (142) of a portion of the supporting boss (140) onto the main body structure (110) falls into the second side (112), and the projection of the outer wall surface (142) of a portion of the supporting boss (140) onto the main body structure (110) falls into the third side (113).

5. The single-cell battery according to any one of claims 2-4, characterized in that, The supporting boss (140) also has an inner wall surface (141) that is opposite to the outer wall surface (142), and the inner wall surface (141) is an inclined surface; The inner wall surface (141) gradually slopes from the end near the second boss (130) to the end away from the second boss (130) towards the outer wall surface (142).

6. The single-cell battery according to claim 5, characterized in that, The support boss (140) has a top surface (144) on the side opposite to the second boss (130). The top surface (144) is connected between the outer wall surface (142) and the inner wall surface (141). The top surface (144) is configured as a plane or an arc surface.

7. The single-cell battery according to claim 3, characterized in that, The support boss (140) also has an inner wall surface (141) disposed opposite to the outer wall surface (142), and the inner wall surface (141) is configured as an arc surface.

8. The single-cell battery according to claim 7, characterized in that, The inner wall surface (141) is connected to the outer wall surface (142) at one end away from the main body structure (110), and the connection is provided with a rounded corner (143).

9. The single-cell battery according to claim 3 or 4, characterized in that, The second boss (130) is further provided with a reinforcing rib (150) on the side opposite to the main body structure (110), and the reinforcing rib (150) is connected between at least two of the supporting bosses (140).

10. A battery pack, characterized in that, Including the single cell battery as described in any one of claims 1 to 9.

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