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, a pole, an electrode assembly, a pin and an insulating piece. The top cover is connected with the shell, the pole is arranged on the top cover, the electrode assembly and the pin are located in the shell, the pin comprises a pole connecting part and a tab welding part connected with each other, the pole connecting part is electrically connected with the pole, and the tab welding part is connected with the electrode assembly. The insulating piece is located in the shell, and the insulating piece comprises a first insulating part, a second insulating part and a limiting piece. The first insulating part is arranged on one side of the top cover close to the electrode assembly, and the pole connecting part is located on one side of the first insulating part close to the electrode assembly. The second insulating part is connected with one side of the first insulating part close to the electrode assembly, and the second insulating part is arranged around the pole connecting part. The limiting piece is fixedly connected with the first insulating part and the pole connecting part respectively. The single battery and the battery pack provided by the application can reduce the problem that the position of the pin deviates in the welding process.

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] The pins of a single cell are prone to misalignment during the soldering process with the tabs, which affects the reliability of the single cell.

[0004] Therefore, providing a single-cell battery that can securely fix the pins is a problem that urgently needs to be solved. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a single-cell battery that aims to solve the technical problem that the pins are prone to positional displacement during the soldering process in the prior art.

[0006] 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, comprising: case; Top cover, connected to the housing; The pole post is located on the top cover; The electrode assembly is located within the housing; The pin is located inside the housing. The pin includes a connected pole post connection part and a tab soldering part. The pole post connection part is electrically connected to the pole post, and the tab soldering part is connected to the electrode assembly. An insulating component is located within the housing. The insulating component includes a first insulating portion, a second insulating portion, and a limiting member. The first insulating portion is disposed on the side of the top cover near the electrode assembly, and the pole post connection portion is located on the side of the first insulating portion near the electrode assembly. The second insulating portion is connected to the side of the first insulating portion near the electrode assembly and is disposed around the pole post connection portion. The limiting member is located on the side of the first insulating portion near the electrode assembly, and the second insulating portion is disposed around the limiting member. The limiting member is fixedly connected to both the first insulating portion and the pole post connection portion.

[0007] In one embodiment of the first aspect, the single cell has a third direction, the electrode connection portion is provided with a connection hole that extends through the third direction, one end of the limiting member near the electrode assembly passes through the connection hole, and the limiting member abuts against the hole wall of the connection hole.

[0008] In one embodiment of the first aspect, the limiting member is a limiting post, the diameter of the limiting post gradually decreases along the third direction toward the electrode assembly, and the diameter of the hole wall of the connecting hole gradually decreases along the third direction toward the electrode assembly.

[0009] In one embodiment of the first aspect, the single cell has a first direction, the electrode post passes through the top cover, the electrode post passing through the top cover is fixedly connected to the electrode post connecting portion, the limiting member is disposed close to the electrode tab welding portion along the first direction, and the limiting member and the electrode post are spaced apart along the first direction.

[0010] In one embodiment of the first aspect, the single cell has a first orientation, and the single cell further includes: An insulating layer is located inside the housing and covers the electrode assembly and the pins. The insulating layer includes a side insulating portion located at the end of the electrode assembly along the first direction. The second insulating part is provided with a hook on the side opposite to the pole connection part along the first direction, and the hook is inserted through the side insulating part.

[0011] In one embodiment of the first aspect, the single battery cell further has a third direction perpendicular to the first direction, the side insulating portion is provided with a snap-fit ​​hole extending through the first direction, the snap-fit ​​hole is located at the end of the side insulating portion near the top cover along the third direction, and a portion of the hook is provided through the snap-fit ​​hole.

[0012] In one embodiment of the first aspect, the single battery cell further has a third direction perpendicular to the first direction, the connector includes a connecting portion and a snap-fit ​​portion, the connecting portion is connected to one end of the second insulating portion away from the side insulating portion along the first direction, the snap-fit ​​portion is connected to the connecting portion, the height of the snap-fit ​​portion along the third direction is greater than the height of the connecting portion along the third direction, and the snap-fit ​​portion passes through the side insulating portion.

[0013] In one embodiment of the first aspect, the snap-fit ​​portion is provided with a slope at one end away from the electrode assembly in the third direction, and the slope is inclined in the first direction from away from the connection portion to closer to the connection portion.

[0014] In one embodiment of the first aspect, the single battery cell further has a second direction perpendicular to the first direction, and two hooks are provided, the two hooks are spaced apart along the second direction, the two hooks are respectively connected to the side insulation portion, and a portion of the two hooks are both inserted through the same snap-fit ​​hole.

[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 beneficial effects of this application are as follows: This application proposes a single cell and a battery pack, wherein the second insulating part is connected to the side of the first insulating part near the electrode assembly, and the second insulating part is arranged around the terminal post connection part, which reduces the possibility of rotational displacement of the terminal post connection part. At the same time, with the limiting member fixedly connected to the first insulating part and the terminal post connection part respectively, the positional displacement of the terminal post connection part during the welding process is further reduced. In this way, the problem of positional displacement of the pins during the welding process is reduced, which can improve the reliability of the single cell structure and thus improve the structural strength of the single cell. 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 A three-dimensional structural schematic diagram of a single cell in one embodiment of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the structure of a single cell in a medium-sized battery. Figure 3 It shows Figure 2 Sectional view along line AA; Figure 4 It shows Figure 2 Sectional view along the BB direction; Figure 5 It shows Figure 3 Enlarged structural diagram of section C; Figure 6 It shows Figure 4 Enlarged structural diagram of section D in the middle; Figure 7 A partial structural cross-sectional view of a single cell in one embodiment of this application is shown; Figure 8A partial structural schematic diagram of a single cell in one embodiment of this application is shown; Figure 9 A schematic diagram of the exploded structure of a single cell in one embodiment of this application is shown; Figure 10 A schematic diagram of the pin structure is shown in one embodiment of this application; Figure 11 A schematic diagram of the insulating layer structure is shown in one embodiment of this application; Figure 12 A schematic diagram of the assembly structure of the insulating member, the limiting member, and the hanging member in one embodiment of this application is shown; Figure 13 It shows Figure 12 A schematic diagram of the insulating component from one perspective; Figure 14 A schematic diagram of the assembly structure of the insulating member and the mounting member in another embodiment of this application is shown.

[0019] Explanation of key component symbols: 100 - Single cell; 110 - Casing; 120 - Top cover; 130 - Electrode assembly; 131 - Electrode body; 132 - First tab; 133 - Second tab; 140 - Pin; 141 - Terminal connection part; 1411 - Connection hole; 142 - Tab welding part; 150 - Terminal post; 152 - Fixing part; 160 - Insulating part; 1601 - Weight reduction hole; 161 - First insulating part; 162 - Second insulating part; 170 - Limiting part; 180 - Hanging part; 1801 - Inclined surface; 1801a - Arc-shaped surface; 181 - Connection part; 182 - Snap-fit ​​part; 190 - Insulating layer; 191 - Side insulating part; 1911 - Snap-fit ​​hole; X - First direction; Y - Second direction; Z - Third 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] The individual battery cell is a crucial component of the battery pack. The inventors discovered that during the welding and assembly of the electrode assembly's tabs and leads, the leads are prone to displacement, reducing the reliability of the individual battery cell.

[0026] To solve the above technical problems, such as Figure 1 and Figure 2As shown, an embodiment of this application provides a single battery cell 100, mainly used in a battery pack. It can be indirectly applied to electrical devices or energy storage devices via a battery pack. Of course, the single battery cell 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 battery cell.

[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, a second direction Y, and a third 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, the second direction Y is the width direction, and the third 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, a terminal post 150, an electrode assembly 130, a lead 140, and an insulating component 160.

[0030] Combination Figure 4 and Figure 9 As shown, the top cover 120 is connected to the housing 110, the pole post 150 is disposed on the top cover 120, and the electrode assembly 130 is located inside the housing 110. Exemplarily, the electrode assembly 130 includes an electrode body 131, a first electrode tab 132 and a second electrode tab 133, and the first electrode tab 132 and the second electrode tab 133 are respectively connected to the two ends of the electrode body 131 along the first direction X.

[0031] Combination Figure 10 As shown, pin 140 is located inside housing 110. Pin 140 includes a connected pole post connection portion 141 and a tab welding portion 142. The pole post connection portion 141 is electrically connected to pole post 150, and the tab welding portion 142 is connected to electrode assembly 130.

[0032] Combination Figure 5 and Figure 6 As shown, the insulating member 160 is located inside the housing 110. The insulating member 160 includes a first insulating part 161, a second insulating part 162, and a limiting member 170. The first insulating part 161 is disposed on the side of the top cover 120 near the electrode assembly 130, and the pole post connecting part 141 is located on the side of the first insulating part 161 near the electrode assembly 130. The second insulating part 162 is connected to the side of the first insulating part 161 near the electrode assembly 130 and is disposed around the pole post connecting part 141. The limiting member 170 is located on the side of the first insulating part 161 near the electrode assembly 130, and the second insulating part 162 is disposed around the limiting member 170. The limiting member 170 is fixedly connected to the first insulating part 161 and the pole post connecting part 141 respectively.

[0033] It should be noted that the second insulating part 162 is circumferentially surrounding the pole post connecting part 141.

[0034] The single-cell battery 100 provided in the embodiments of this application has a second insulating portion 162 connected to the side of the first insulating portion 161 near the electrode assembly 130. The second insulating portion 162 is disposed around the terminal post connection portion 141 so that the circumferential edge of the terminal post connection portion 141 abuts against the second insulating portion 162, preventing the terminal post connection portion 141 from rotating relative to the terminal post 150 and reducing the possibility of rotational displacement of the terminal post connection portion 141. At the same time, when the limiting member 170 is fixedly connected to the first insulating portion 161 and the terminal post connection portion 141 respectively, it further prevents the terminal post connection portion 141 from rotating, that is, it restricts the terminal post connection portion 141 from shifting in the first direction X or the second direction Y, thereby reducing the situation where the terminal post connection portion 141 shifts position during the welding process. In this way, the problem of the pin 140 shifting position during the welding process is reduced, thereby improving the structural strength of the single-cell battery 100 and improving the reliability of the single-cell battery 100.

[0035] like Figure 6 As shown, in some embodiments, the single cell 100 has a third direction Z, and the electrode connection portion 141 is provided with a connection hole 1411 extending along the third direction Z. The end of the limiting member 170 near the electrode assembly 130 passes through the connection hole 1411, and the limiting member 170 abuts against the hole wall of the connection hole 1411. In this embodiment, by opening a connection hole 1411 on the electrode connection portion 141, the limiting member 170 abuts against the hole wall of the connection hole 1411, so as to connect the limiting member 170 to the electrode connection portion 141, which facilitates installation.

[0036] like Figure 7As shown, in some embodiments, exemplarily, the limiting member 170 is a limiting post, the diameter of which gradually decreases along the Z-direction towards the electrode assembly 130, and the diameter of the hole wall of the connecting hole 1411 gradually decreases along the Z-direction towards the electrode assembly 130, and the limiting post and the hole wall of the connecting hole 1411 can be clearance-fitted or interference-fitted. In this embodiment, the diameter of the limiting post gradually decreases along the Z-direction towards the electrode assembly 130, making the limiting post have a tapered structure, which facilitates the installation of the connecting hole 1411 that mates with it.

[0037] It should be noted that the limit post is in Figure 7 The diameter gradually decreases from top to bottom, meaning the cross-sectional area of ​​the limiting post gradually decreases from top to bottom.

[0038] Meanwhile, since the insulating component 160 is made of a rigid material, in order to facilitate assembly, the limiting post and the hole wall of the connecting hole 1411 are fitted with a clearance fit in this embodiment, and a chamfer is provided at the end of the limiting post near the electrode assembly 130 to facilitate the assembly of the limiting post and the electrode connection part 141.

[0039] like Figure 6 and Figure 8 As shown, in some embodiments, the single cell 100 has a first direction X, and the single cell 100 also includes a fixing part 152 fixedly connected to the electrode post 150. The fixing part 152 is arranged around the electrode post 150 and is located on the side of the top cover 120 away from the electrode assembly 130.

[0040] The pole post 150 is inserted through the top cover 120. The pole post 150 inserted through the top cover 120 is fixedly connected to the pole post connecting part 141. The limiting member 170 is disposed close to the electrode tab welding part 142 along the first direction X, and the limiting member 170 and the pole post 150 are spaced apart along the first direction X.

[0041] In this embodiment, by setting the limiting member 170 and the electrode post 150 at intervals along the first direction X, the installation of the electrode post 150 and the electrode post connection portion 141 is not affected, which facilitates the assembly of the single cell battery 100.

[0042] like Figure 3 , Figure 5 , Figure 9 and Figure 11 As shown, in some embodiments, the single cell 100 has a first direction X, and the single cell 100 also includes an insulating layer 190 located inside the housing 110, covering the electrode assembly 130 and the leads 140. The insulating layer 190 includes a side insulating portion 191 located at the end of the electrode assembly 130 along the first direction X.

[0043] Combination Figure 13As shown, a hook 180 is provided on the side of the second insulating part 162 opposite to the pole post connection part 141 along the first direction X, and the hook 180 passes through the side insulating part 191.

[0044] In this embodiment, by providing a hanger 180 on the side of the second insulating part 162 away from the pole post connection part 141 along the first direction X, the hanger 180 is inserted into the side insulating part 191 of the insulating layer 190. In this way, compared with the prior art which usually uses adhesive bonding between the side insulating part 191 and the second insulating part 162, the hanger 180 can prevent the side insulating part 191 from moving along the third direction Z, increasing the connection strength between the insulating layer 190 and the second insulating part 162, thereby increasing the structural strength of the single cell 100.

[0045] In other embodiments, adhesive may be provided between the insulating layer 190 and the second insulating portion 162, which, together with the hanger 180, can better increase the connection strength between the insulating layer 190 and the second insulating portion 162.

[0046] like Figure 6 , Figure 7 and Figure 11 As shown, in some embodiments, the single cell 100 also has a third direction Z perpendicular to the first direction X. The side insulating portion 191 is provided with a snap-fit ​​hole 1911 extending through the first direction X. The snap-fit ​​hole 1911 is located at the end of the side insulating portion 191 along the third direction Z near the top cover 120. A portion of the hook 180 passes through the snap-fit ​​hole 1911.

[0047] In this embodiment, a snap-fit ​​hole 1911 is provided on the side insulating part 191 to facilitate the engagement of the hook 180 with the snap-fit ​​hole 1911, thereby limiting the position of the side insulating part 191.

[0048] like Figure 5 As shown, in some embodiments, the single cell 100 also has a third direction Z perpendicular to the first direction X. The connector 180 includes a connecting portion 181 and a snap-fit ​​portion 182. The connecting portion 181 is connected to the end of the second insulating portion 162 away from the side insulating portion 191 along the first direction X. The snap-fit ​​portion 182 is connected to the connecting portion 181. The height of the snap-fit ​​portion 182 along the third direction Z is greater than the height of the connecting portion 181 along the third direction Z. The snap-fit ​​portion 182 passes through the side insulating portion 191.

[0049] In this embodiment, the hook 180 is connected to the second insulating part 162 through the connecting part 181, and the snap-fit ​​part 182 passes through the side insulating part 191. In the third direction Z, the height of the snap-fit ​​part 182 is greater than the height of the connecting part 181, so that the side of the snap-fit ​​part 182 facing the connecting part 181 can abut against the side insulating part 191, thereby enhancing the position limitation of the side insulating part 191.

[0050] Continue reading Figure 5 As shown, in some embodiments, the snap-fit ​​portion 182 has a bevel 1801 at the end away from the electrode assembly 130 along the third direction Z. The bevel 1801 is inclined along the first direction X from away from the connecting portion 181 to closer to the connecting portion 181. In this way, the bevel 1801 facilitates the snap-fit ​​portion 182 to pass through the snap-fit ​​hole 1911 of the side insulating portion 191.

[0051] For example, the inclined surface 1801 is an arc-shaped surface 1801a. The arc-shaped surface 1801a makes it easier for the snap-fit ​​part 182 to pass through the snap-fit ​​hole 1911.

[0052] like Figure 14 As shown, in some embodiments, the single battery cell 100 also has a second direction Y perpendicular to the first direction X. Exemplarily, two hangers 180 are provided, spaced apart along the second direction Y. Each hanger 180 is connected to the side insulation portion 191, and a portion of each hanger 180 passes through the same snap-fit ​​hole 1911. In this embodiment, two hangers 180 are provided. By having both hangers 180 pass through the same snap-fit ​​hole 1911, movement of the side insulation portion 191 along the third direction Z is prevented, increasing the connection strength of the insulation layer 190 and thus increasing the structural strength of the single battery cell 100. Of course, in other embodiments, one, three, or other hangers 180 may also be provided.

[0053] like Figure 12 As shown, in some embodiments, the insulating member 160 has a through-hole 1601 along the third direction Z. Exemplarily, the first insulating part 161 has a through-hole 1601 along the third direction Z. The provision of the through-hole 1601 reduces the overall weight of the insulating member 160, thereby reducing the weight of the single battery 100 and facilitating the lightweighting of the single battery 100.

[0054] According to the type of metal ions, the battery cell 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 battery cell provided in this embodiment can be a liquid battery, i.e., using a liquid electrolyte. Exemplarily, the electrode post 150 can include a positive electrode post and a negative electrode post, and the electrode assembly 130 can be manufactured using a winding process or a stacking process. The tabs include a first tab 132 and a second tab 133, one of which is a positive tab and the other a negative tab. The electrode body 131 is immersed in the liquid electrolyte and includes a positive electrode plate, a negative electrode plate, and a separator layer. The separator layer is disposed between the positive and negative electrode plates, and the material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode 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 also to the positive electrode post. The negative electrode 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 also to the negative electrode post. Taking lithium ions as an example, the materials of the positive current collector and the positive tab can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc. The materials of the negative current collector and the negative tab can be copper, and the negative active material can be graphite, silicon, etc.

[0055] Of course, the battery cell provided in this embodiment can also be a solid-state battery, that is, 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. No specific limitation is made on the type of battery cell here.

[0056] It should be noted that, in the above embodiments, exemplarily, the materials of the insulating component 160 and / or the insulating layer 190 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.

[0057] This application also provides a battery pack, including the single battery cell 100 in any of the above embodiments. Since the battery pack has the aforementioned single battery cell 100, it possesses all the beneficial effects of the single battery cell 100, which will not be elaborated upon here.

[0058] 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.

[0059] 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, characterized by, The single battery (100) has a third direction (Z), the pole post connecting part (141) is provided with a connecting hole (1411) penetrating along the third direction (Z), one end of the limiting piece (170) close to the electrode assembly (130) is provided in the connecting hole (1411), and the limiting piece (170) abuts against the hole wall of the connecting hole (1411). The limiting piece (170) is a limiting column, the diameter of the limiting column gradually decreases in the direction close to the electrode assembly (130) along the third direction (Z), and the diameter of the hole wall of the connecting hole (1411) gradually decreases in the direction close to the electrode assembly (130) along the third direction (Z). The single battery (100) has a first direction (X), the pole post (150) is provided in the top cover (120), the pole post (150) provided in the top cover (120) is fixedly connected with the pole post connecting part (141), the limiting piece (170) is arranged close to the tab welding part (142) along the first direction (X), and the limiting piece (170) is arranged in the first direction (X) and spaced from the pole post (150). The single battery (100) has a first direction (X), the single battery (100) further comprises: ​ ​ ​ 2. The cell according to claim 1, wherein ​ 3. The cell according to claim 2, wherein ​ 4. The cell according to claim 1, wherein ​ 5. The cell according to claim 1, wherein ​ An insulating layer (190) is located in the shell (110), the insulating layer (190) is wrapped outside the electrode assembly (130) and the pin (140), the insulating layer (190) includes a side insulating part (191), the side insulating part (191) is located at the end of the electrode assembly (130) along the first direction (X); The second insulating part (162) is provided with a hanging piece (180) on the side away from the pole connecting part (141) along the first direction (X), and the hanging piece (180) penetrates the side insulating part (191).

6. The cell according to claim 5, wherein The monomer battery (100) also has a third direction (Z) perpendicular to the first direction (X), the side insulating part (191) is provided with a clamping hole (1911) penetrating along the first direction (X), the clamping hole (1911) is located at the end of the side insulating part (191) close to the top cover (120) along the third direction (Z), and part of the hanging piece (180) penetrates the clamping hole (1911).

7. The cell according to claim 5, wherein The monomer battery (100) also has a third direction (Z) perpendicular to the first direction (X), the hanging piece (180) includes a connecting part (181) and a clamping part (182), the connecting part (181) is connected with one end of the second insulating part (162) away from the side insulating part (191) along the first direction (X), the clamping part (182) is connected with the connecting part (181), the height of the clamping part (182) along the third direction (Z) is greater than the height of the connecting part (181) along the third direction (Z), and the clamping part (182) penetrates the side insulating part (191).

8. The cell according to claim 7, wherein The clamping part (182) is provided with an inclined surface (1801) at one end away from the electrode assembly (130) along the third direction (Z), and the inclined surface (1801) is inclined from the direction away from the connecting part (181) to the direction close to the connecting part (181) along the first direction (X).

9. The cell according to claim 6, wherein The monomer battery (100) also has a second direction (Y) perpendicular to the first direction (X) and the third direction (Z), the hanging piece (180) is provided with two, the two hanging pieces (180) are spaced apart along the second direction (Y), the two hanging pieces (180) are connected with the side insulating part (191) respectively, and part of the two hanging pieces (180) penetrates the same clamping hole (1911).

10. A battery pack, characterized by, Comprising: The monomer battery (100) of any one of claims 1-9.

Images