Single cell and battery pack

Abstract

The application discloses a single battery and a battery pack. The single battery comprises a shell, a top cover, an electrode assembly, two pins and an insulation layer. The top cover is connected with the shell; the electrode assembly is located in the shell, and the electrode assembly comprises an electrode body and two tabs, the two tabs are connected with two ends of the electrode body along a first direction respectively; the two pins are located in the shell, the two pins are electrically connected with the two tabs respectively, a part of the pin is located at an end of the electrode body along the first direction, and an edge of the pin away from the electrode body along the first direction does not exceed an edge of the tab away from the electrode body along the first direction; the insulation layer is located in the shell, the insulation layer covers the electrode assembly and the pin, and a side of the insulation layer along the first direction is spaced from the edge of the tab away from the electrode body along the first direction. The single battery provided by the application reduces the probability of pin scratching the insulation layer and reduces the possibility of insulation failure of the insulation layer.

Description

Technical Field

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

[0002] A power battery pack is a power source that provides power to new energy vehicles. Power battery packs are becoming an increasingly widely used new energy product.

[0003] Currently, the pins of existing single-cell batteries with tabs on the side are prone to scratching the insulation layer, causing insulation failure. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single-cell battery that aims to solve the technical problem of insulation failure of the insulating layer in the existing single-cell battery.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a single-cell battery having a first orientation, including: case; Top cover, connected to the housing; An electrode assembly is located inside the housing, and the electrode assembly includes an electrode body and two tabs, the two tabs being respectively connected to the two ends of the electrode body along the first direction; Two pins are located inside the housing, and the two pins are electrically connected to the two tabs respectively. A portion of the pins is located at the end of the electrode body along the first direction, and the edge of the pins away from the electrode body along the first direction does not extend beyond the edge of the tabs away from the electrode body along the first direction. An insulating layer is located inside the housing, covering the electrode assembly and the pins, and the insulating layer is spaced apart from the edge of the tab along the first direction away from the electrode body along the first direction on one side of the insulating layer.

[0006] The single-cell battery provided in this application has its pins positioned such that the edge of the pins away from the electrode body along the first direction does not extend beyond the edge of the tabs away from the electrode body along the first direction. The insulating layer is spaced apart from the edge of the tabs away from the electrode body along the first direction on one side. This increases the distance between the edge of the pins along the first direction and the insulating layer, reducing the probability of the pins scratching the insulating layer. This prevents the probability of the pins damaging the insulating layer due to displacement, thereby reducing the possibility of insulation failure and improving the reliability of the single-cell battery.

[0007] In one embodiment of the first aspect, the insulating layer includes two side insulating portions located at both ends of the electrode body along the first direction, and the side insulating portions are spaced apart from the edge of the tab along the first direction away from the electrode body.

[0008] In one embodiment of the first aspect, the edge of the pin away from the electrode body along the first direction is flush with the edge of the tab away from the electrode body along the first direction.

[0009] In one embodiment of the first aspect, the single cell further includes two terminals and two insulating members, the two terminals are respectively disposed through the top cover, the two terminals are electrically connected to the two pins respectively, the insulating members are located on the side of the top cover away from the electrode body, and the insulating members are connected to a portion of the terminals; The single cell also has a second direction perpendicular to the first direction. A groove is provided on the side of the top cover away from the electrode body. The groove wall surrounds the electrode post. The groove extends along the second direction toward the electrode assembly. The insulating member is disposed in the groove.

[0010] In one embodiment of the first aspect, the pole includes a first pole portion and a second pole portion fixedly connected, the first pole portion passing through the top cover, the second pole portion surrounding the first pole portion, a portion of the insulating member being located between the second pole portion and the top cover, and a portion of the second pole portion being located within the groove.

[0011] In one embodiment of the first aspect, a reinforcing member is provided on the side of the top cover opposite to the electrode body, and the reinforcing member is disposed in the groove.

[0012] In one embodiment of the first aspect, a plurality of reinforcing members are provided, the plurality of reinforcing members are arranged circumferentially along the first pole post portion, and the end of the reinforcing member away from the first pole post portion abuts against the groove wall of the groove.

[0013] In one embodiment of the first aspect, the width of the reinforcing member gradually increases from the direction close to the first pole portion to the direction away from the first pole portion.

[0014] In one embodiment of the first aspect, the reinforcing member includes a top surface along the second direction, the top surface being disposed on a side opposite to the electrode assembly; The top cover includes a first surface and a second surface along the second direction, the first surface being disposed away from the electrode assembly, and the second surface being disposed towards the electrode assembly; The top surface is located between the first surface and the second surface along the second direction.

[0015] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0016] The second aspect of this application provides a battery pack having individual cells as described in any of the above embodiments, and therefore possesses all the beneficial effects of the individual cells provided in the embodiments of the first aspect, which will not be elaborated here. Attached Figure Description

[0017] 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.

[0018] Figure 1 This paper shows a schematic diagram of a single cell structure from one perspective in one embodiment of the present application; Figure 2 It shows Figure 1 Sectional view along line AA; Figure 3 It shows Figure 2 Enlarged structural diagram of section B in the middle; Figure 4 It shows Figure 1 Another structural diagram of a single cell; Figure 5 It shows Figure 4 C-axis sectional view; Figure 6 It shows Figure 5 Enlarged structural diagram of section D in the middle; Figure 7 A partial structural schematic diagram of a single cell in one embodiment of this application is shown; Figure 8 A schematic diagram of the exploded view of a single cell in one embodiment of this application; Figure 9 A schematic diagram of the top cover of a single battery cell from one perspective in one embodiment of this application; Figure 10 It shows Figure 9 EE-directed sectional view; Figure 11 It shows Figure 10 Enlarged structural diagram of section F in the middle; Figure 12A schematic diagram of the pin structure in a single cell of this application is shown.

[0019] Explanation of key component symbols: 100 - Single cell; 110 - Casing; 120 - Top cover; 1201 - First surface; 1202 - Second surface; 121 - Groove; 122 - Terminal hole; 123 - Reinforcing member; 1231 - Top surface; 124 - Protrusion; 130 - Electrode assembly; 131 - Electrode body; 132 - Tab; 140 - Pin; 141 - Terminal connection; 142 - Tab welding; 150 - Insulating layer; 151 - Side insulation; 160 - Terminal; 161 - First terminal part; 162 - Second terminal part; 170 - Insulating member; 171 - Through hole; 172 - Positioning hole; x - First direction; z - Second direction. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Individual cells are an important component of battery packs. The inventors discovered that in individual cells with tabs on the side, the tabs are located on both sides of the cell's length. Correspondingly, a portion of the pins connects to the tabs, and an insulating layer covers the outside of the electrode assembly. During reassembly or due to pin displacement, the pins are prone to scratching the insulating layer, causing insulation failure.

[0026] To solve the above technical problems, such as Figure 1 and Figure 2 As shown, embodiments of this application provide a single-cell battery 100, primarily used in battery packs. It can be indirectly applied to electrical devices or energy storage devices via a battery pack. Of course, the single-cell battery 100 can also be directly applied to electrical devices or energy storage devices without using a battery pack; therefore, no specific limitations are placed on the application scenarios of the single-cell battery 100.

[0027] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0028] The single cell 100 has a first direction x and a second direction z that are perpendicular to each other. For the sake of convenience in the following description of the embodiments, the first direction x is the length direction and the second direction z is the height direction.

[0029] like Figures 1 to 3 As shown, the single cell 100 includes a housing 110, a top cover 120, an electrode assembly 130, two pins 140, and an insulating layer 150.

[0030] The top cover 120 is connected to the housing 110. The electrode assembly 130 is located inside the housing 110, and the electrode assembly 130 includes an electrode body 131 and two tabs 132, which are respectively connected to the two ends of the electrode body 131 along the first direction x.

[0031] Combination Figure 7 and Figure 8 As shown, two pins 140 are located inside the housing 110, and the pins 140 are located on the side of the top cover 120 near the electrode body 131. The two pins 140 are electrically connected to two tabs 132, respectively; that is, one pin 140 is connected to one tab 132, and the other pin 140 is connected to the other tab 132. A portion of the pin 140 is located at the end of the electrode body 131 along the first direction x, and the edge of the pin 140 along the first direction x away from the electrode body 131 does not extend beyond the edge of the tab 132 along the first direction x away from the electrode body 131.

[0032] An insulating layer 150 is located inside the housing 110 and covers the electrode assembly 130 and the pin 140. The insulating layer 150 is spaced apart from the edge of the tab 132 away from the electrode body 131 along the first direction x on one side. This creates a gap between the tab 132 and the insulating layer 150 in the first direction x, thereby ensuring a gap between the pin 140 and the insulating layer 150 in the first direction x, reducing the probability of the pin 140 scratching the insulating layer 150.

[0033] The single-cell battery 100 provided in the embodiments of this application has the edge of the pin 140 away from the electrode body 131 along the first direction x not exceeding the edge of the tab 132 away from the electrode body 131 along the first direction x. The insulating layer 150 is spaced apart from the edge of the tab 132 away from the electrode body 131 along the first direction x on one side. This increases the distance between the edge of the pin 140 and the insulating layer 150 along the first direction x, reduces the probability of the pin 140 scratching the insulating layer 150, and thus prevents the probability of the pin 140 scratching the insulating layer 150 due to displacement. This further reduces the possibility of insulation failure of the insulating layer 150 and improves the reliability of the single-cell battery 100.

[0034] like Figure 3 As shown, in some embodiments, exemplarily, the insulating layer 150 includes two side insulating portions 151 located at both ends of the electrode body 131 along the first direction x. The side insulating portions 151 and the tab 132 are spaced apart along the first direction x away from the edge of the electrode body 131. In this embodiment, by providing the two side insulating portions 151 at both ends of the electrode body 131 along the first direction x, a gap is formed between the tab 132 and the side insulating portions 151 in the first direction x, thereby creating a gap between the pin 140 and the side insulating portions 151 in the first direction x. This prevents the probability of the pin 140 scratching the side insulating portions 151 due to displacement, thereby reducing the possibility of insulation failure of the insulating layer 150.

[0035] like Figure 3 As shown, in some embodiments, the edge of pin 140 away from electrode body 131 along the first direction x is flush with the edge of tab 132 away from electrode body 131 along the first direction x. This facilitates soldering of pin 140 and tab 132 and improves soldering efficiency.

[0036] like Figure 12As shown, exemplarily, pin 140 includes a terminal connection portion 141 and a tab soldering portion 142. The terminal connection portion 141 extends along a first direction x and is electrically connected to the terminal 160. The tab soldering portion 142 extends along a second direction z and is electrically connected to the tab 132. The edge of the tab soldering portion 142 on the side away from the electrode body 131 along the first direction x does not extend beyond the edge of the tab 132 on the side away from the electrode body 131 along the first direction x. This creates a gap between the tab soldering portion 142 and the insulating layer 150 in the first direction x, reducing the probability of the tab soldering portion 142 scratching the insulating layer 150.

[0037] In the above embodiments for reducing the failure of the insulation layer 150, the inventors also found that the existing single cell 100 occupies a large amount of space in the second direction z, affecting the volume of the single cell 100. To solve this technical problem, such as... Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the single cell 100 further includes two terminals 160 and two insulating members 170. The two terminals 160 are respectively disposed through the top cover 120 and electrically connected to two pins 140. The insulating member 170 is located on the side of the top cover 120 away from the electrode body 131. The insulating member 170 is connected to a portion of the terminal 160. The insulating member 170 has a through hole 171 along the second direction z. A portion of the terminal 160 passes through the through hole 171 and abuts against the hole wall of the through hole 171. The single cell 100 also has a second direction z perpendicular to the first direction x. A groove 121 is provided on the side of the top cover 120 away from the electrode body 131. The groove wall of the groove 121 surrounds the terminal 160. The groove 121 extends along the second direction z towards the electrode assembly 130. The insulating member 170 is disposed in the groove 121.

[0038] In this embodiment, by opening a groove 121 on the side of the top cover 120 away from the electrode body 131, and the groove 121 is recessed in the direction of the second direction z toward the electrode assembly 130, the insulating member 170 is located in the groove 121. In this way, since the insulating member 170 is located in the groove 121, the height of the single cell 100 in the second direction z is reduced, thereby reducing the volume of the single cell 100.

[0039] like Figure 6 As shown, in the above embodiment, the pole 160 includes a first pole portion 161 and a second pole portion 162 that are fixedly connected. The first pole portion 161 passes through the top cover 120, and the second pole portion 162 surrounds the first pole portion 161. A portion of the insulating member 170 is located between the second pole portion 162 and the top cover 120, and a portion of the second pole portion 162 is located in the groove 121.

[0040] like Figure 9As shown, in some embodiments, a reinforcing member 123 is provided on the side of the top cover 120 opposite to the electrode body 131, and the reinforcing member 123 is disposed in the groove 121. In this embodiment, by providing the reinforcing member 123 in the groove 121, the overall structural strength of the top cover 120 is increased, thereby improving the structural strength of the single cell 100.

[0041] like Figure 9 As shown, in some embodiments, multiple reinforcing members 123 are provided, arranged circumferentially along the first pole post portion 161, with one end of the reinforcing member 123 away from the first pole post portion 161 abutting against the groove wall of the groove 121. Exemplarily, four reinforcing members 123 are provided, arranged circumferentially along the first pole post portion 161. Of course, in other embodiments, the number of reinforcing members 123 can also be two, three, five, six, etc., which will not be listed here.

[0042] like Figure 9 As shown, in some embodiments, the width of the reinforcing member 123 gradually increases from the direction near the first pole post 161 to the direction away from the first pole post 161. This arrangement facilitates the machining of the pole post hole 122 by the top cover 120, while also ensuring the structural strength of the top cover 120.

[0043] like Figure 10 and Figure 11 As shown, in some embodiments, the reinforcing member 123 includes a top surface 1231 along the second direction z, and the top surface 1231 is disposed on the side opposite to the electrode assembly 130. The top cover 120 includes a first surface 1201 and a second surface 1202 along the second direction z, the first surface 1201 is disposed opposite to the electrode assembly 130, and the second surface 1202 is disposed towards the electrode assembly 130; the top surface 1231 is located between the first surface 1201 and the second surface 1202 along the second direction z, so that the insulating member 170 located in the groove 121 can still reduce its height in the second direction z, thereby reducing the volume of the single cell 100 and thus reducing the space occupied by the single cell 100.

[0044] For example, the reinforcing member 123 and the top cover 120 are integrally formed. On the one hand, this facilitates manufacturing, improves production efficiency, thereby reducing production costs and enhancing market competitiveness. On the other hand, the integrally formed reinforcing member 123 and top cover 120 reduce the probability of breakage at the connection between the reinforcing member 123 and the top cover 120, and improve the connection strength between the reinforcing member 123 and the top cover 120.

[0045] It should be noted that integral molding, such as stamping, injection molding, die casting, extrusion, blow molding, 3D printing, etc., does not specifically limit the types of integral molding here.

[0046] For example, the material of the top cover 120 and / or the material of the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0047] like Figure 6 As shown, in some embodiments, a protrusion 124 is provided on the side of the top cover 120 facing away from the electrode assembly 130, and a positioning hole 172 is provided on the side of the insulating member 170 facing the top cover 120, which mates with the protrusion 124. The protrusion 124 is inserted into the positioning hole 172. The mate between the protrusion 124 and the positioning hole 172 facilitates the assembly of the insulating member 170 onto the top cover 120 and also reduces the possibility of the insulating member 170 moving relative to the top cover 120.

[0048] It should be noted that, in the above embodiments, exemplarily, the materials of the insulating layer 150 and / or the insulating component 170 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0049] According to the type of metal ions, the single-cell battery 100 provided in this embodiment can be a lithium-ion battery, a sodium-ion battery, etc. Furthermore, according to the physical state of the electrolyte, the single-cell battery 100 provided in this embodiment can be a liquid battery, i.e., using a liquid electrolyte. Exemplarily, the electrode post 160 may include a positive electrode post and a negative electrode post, and the electrode assembly 130 may be manufactured using a winding process or a stacking process. One of the two tabs 132 is a positive electrode tab, and the other is a negative electrode tab. The electrode body 131 is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet, and the material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0050] Of course, the single cell 100 provided in this embodiment can also be a solid-state battery, that is, it uses a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of single cell 100 is not specifically limited here.

[0051] Embodiments of this application also provide a battery pack, including the single battery cell 100 in any of the above embodiments.

[0052] The embodiments of this application propose a battery pack having the single cell 100 in any of the above embodiments. Therefore, it has all the beneficial effects of the single cell 100 provided in any of the above embodiments, which will not be elaborated here. That is, the battery pack provided by the embodiments of this application reduces the possibility of insulation layer 150 failure, and at the same time, since the space occupied by the single cell 100 is reduced, the volume of the battery pack is also reduced.

[0053] 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.

[0054] 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 having a first orientation (x), characterized in that, include: Casing (110); The top cover (120) is connected to the housing (110); An electrode assembly (130) is located inside the housing (110), and the electrode assembly (130) includes an electrode body (131) and two tabs (132), the two tabs (132) being connected to the two ends of the electrode body (131) along the first direction (x); Two pins (140) are located inside the housing (110). The two pins (140) are electrically connected to the two tabs (132) respectively. A portion of the pins (140) is located at the end of the electrode body (131) along the first direction (x). The edge of the pins (140) along the first direction (x) away from the electrode body (131) does not extend beyond the edge of the tabs (132) along the first direction (x) away from the electrode body (131). An insulating layer (150) is located inside the housing (110). The insulating layer (150) covers the electrode assembly (130) and the pin (140). The insulating layer (150) is spaced apart from the edge of the tab (132) away from the electrode body (131) along the first direction (x) on one side.

2. The single-cell battery according to claim 1, characterized in that, The insulating layer (150) includes two side insulating portions (151), which are located at both ends of the electrode body (131) along the first direction (x). The side insulating portions (151) and the tabs (132) are spaced apart from each other along the first direction (x) away from the electrode body (131).

3. The single-cell battery according to claim 1, characterized in that, The edge of the pin (140) away from the electrode body (131) along the first direction (x) is flush with the edge of the tab (132) away from the electrode body (131) along the first direction (x).

4. The single-cell battery according to claim 1, characterized in that, The single cell (100) also includes two terminals (160) and two insulating members (170). The two terminals (160) are respectively inserted through the top cover (120) and electrically connected to the two pins (140). The insulating member (170) is located on the side of the top cover (120) away from the electrode body (131) and is connected to a part of the terminal (160). The single cell (100) also has a second direction (z) perpendicular to the first direction (x). The top cover (120) has a groove (121) on the side away from the electrode body (131). The groove wall of the groove (121) surrounds the electrode post (160). The groove (121) extends along the second direction (z) toward the electrode assembly (130). The insulating member (170) is disposed in the groove (121).

5. The single-cell battery according to claim 4, characterized in that, The pole (160) includes a first pole part (161) and a second pole part (162) fixedly connected. The first pole part (161) passes through the top cover (120), and the second pole part (162) surrounds the first pole part (161). A portion of the insulating member (170) is located between the second pole part (162) and the top cover (120), and a portion of the second pole part (162) is located in the groove (121).

6. The single-cell battery according to claim 5, characterized in that, The top cover (120) is provided with a reinforcing member (123) on the side opposite to the electrode body (131), and the reinforcing member (123) is disposed in the groove (121).

7. The single-cell battery according to claim 6, characterized in that, The reinforcing member (123) is provided in multiple ways, and the multiple reinforcing members (123) are arranged circumferentially along the first pole post (161), and the end of the reinforcing member (123) away from the first pole post (161) abuts against the groove wall of the groove (121).

8. The single-cell battery according to claim 6, characterized in that, The width of the reinforcing member (123) gradually increases from the direction close to the first pole post (161) to the direction away from the first pole post (161).

9. The single-cell battery according to claim 6, characterized in that, The reinforcing member (123) includes a top surface (1231) along the second direction (z), the top surface (1231) being disposed on a side opposite to the electrode assembly (130); The top cover (120) includes a first surface (1201) and a second surface (1202) along the second direction (z), the first surface (1201) being disposed away from the electrode assembly (130), and the second surface (1202) being disposed towards the electrode assembly (130); The top surface (1231) is located between the first surface (1201) and the second surface (1202) along the second direction (z).

10. A battery pack, characterized in that, Includes the single cell (100) according to any one of claims 1 to 9.

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