Single cell and battery pack

Abstract

The application discloses a single battery and a battery pack, and relates to the technical field of power batteries. The single battery comprises a shell, a top cover, an electrode assembly, an electrode assembly, two pins and a first limiting piece, the top cover is connected with the shell; the electrode assembly is located in the shell, the electrode assembly comprises an electrode main body, a first tab and a second tab, the first tab and the second tab are connected with two ends of the electrode main body along a first direction respectively; an insulating piece is located in the shell and arranged on one side of the top cover close to the electrode main body; the two pins are located in the shell, the pins are located on one side of the insulating piece close to the electrode main body, one pin of the two pins is electrically connected with the first tab, and the other pin is electrically connected with the second tab; the first limiting piece is located in the shell, the first limiting piece is connected with one side of the insulating piece close to the electrode main body, and the first limiting piece is in abutment with the pin. The single battery provided by the application improves the structural strength of the single battery.

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 single battery cell is the power source that powers new energy vehicles. As a new energy product, single batteries are becoming increasingly widely used.

[0003] The existing single-cell battery pins are not securely fixed, resulting in structural strength issues. 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 poor structural strength of single-cell batteries in the prior art.

[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, a first electrode tab, and a second electrode tab, wherein the first electrode tab and the second electrode tab are respectively connected to the two ends of the electrode body along the first direction; An insulating element is located inside the housing, and the insulating element is disposed on the side of the top cover near the electrode body; Two pins are located inside the housing, and the pins are located on the side of the insulating member closer to the electrode body. One of the two pins is electrically connected to the first electrode tab, and the other pin is electrically connected to the second electrode tab. A first limiting member is located inside the housing. The first limiting member is connected to the side of the insulating member near the electrode body, and the first limiting member abuts against the pin.

[0006] In one embodiment of the first aspect, the single battery cell further includes two terminals disposed on the top cover, and the two terminals are electrically connected to the two pins respectively; The first limiting member is located on the side of the insulating member away from the pole along the first direction.

[0007] In one embodiment of the first aspect, the first limiting member has a guiding surface on the side facing the electrode body.

[0008] In one embodiment of the first aspect, the single cell further has a second direction perpendicular to the first direction, the first limiting member extends along the second direction, and the length of the first limiting member along the second direction is greater than half the length of the pin along the second direction.

[0009] In one embodiment of the first aspect, the single cell further has a second direction perpendicular to the first direction, and the single cell further includes a second limiting member connected to the side of the pin near the electrode body; the second limiting member extends along the second direction and is connected to the electrode body.

[0010] In one embodiment of the first aspect, the pin includes a connected pole post connection portion and a tab welding portion, the tab welding portion being located on the side of the pole post connection portion near the electrode assembly, the pole post connection portion being electrically connected to the pole post, the tab welding portions of the two pins being electrically connected to the first tab and the second tab respectively, and the second limiting member being connected to the tab welding portion on the side near the electrode body along the first direction.

[0011] In one embodiment of the first aspect, the insulating layer is connected to the second limiting member on the side of the electrode body along the first direction, and the insulating layer abuts against the electrode body along the first direction.

[0012] In one embodiment of the first aspect, the single cell further has a third direction that is mutually perpendicular to both the first direction and the second direction, the insulating layer extending along the third direction, and the length of the insulating layer along the third direction is greater than the length of the second limiting member along the third direction.

[0013] In one embodiment of the first aspect, the insulating layer is provided with at least one first connecting portion on the side near the second limiting member, and the second limiting member is provided with at least one second connecting portion on the side near the insulating layer, wherein one first connecting portion is connected to one second connecting portion.

[0014] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0015] The beneficial effects of this application are: This application proposes a single cell battery and a battery pack, wherein the pin is located on the side of the insulating member close to the electrode body, and the first limiting member is connected to the side of the insulating member close to the electrode body. At the same time, the first limiting member abuts against the pin. In this way, the setting of the first limiting member can improve the reliability of the single cell battery structure and improve the structural strength of the single cell battery. 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 three-dimensional structural schematic diagram of a single cell in one embodiment of this application is shown; Figure 2 This paper shows a schematic diagram of a single cell structure from one perspective in one embodiment of the present application; Figure 3 It shows Figure 2 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 4 It shows Figure 3 Enlarged structural diagram of section B in the middle; Figure 5 This paper shows a schematic diagram of the structure of a single cell battery in one embodiment of the present application from another perspective; Figure 6 It shows Figure 5 Schematic diagram of the cross-sectional structure along the CC direction; Figure 7 It shows Figure 6 Enlarged structural diagram of section D in the middle; Figure 8 A partial structural diagram of a single cell in one embodiment of this application is shown. Figure 1 ; Figure 9 It shows Figure 8 Enlarged structural diagram of section E; Figure 10 This paper shows an exploded view of the structure of a single cell in one embodiment of the present application. Figure 11 This invention provides a schematic diagram of the structure of a single battery cell with its casing removed, according to one embodiment of the present application. Figure 12 A partial structural diagram of a single cell in one embodiment of this application is shown. Figure 2 ; Figure 13 A schematic diagram of the structure of the insulating layer in one embodiment of this application is shown.

[0018] Explanation of key component symbols: 100 - Single cell; 110 - Casing; 120 - Electrode assembly; 121 - Tab; 1211 - First tab; 1212 - Second tab; 122 - Electrode body; 130 - Top cover; 131 - Terminal post; 140 - Pin; 1401 - Tab welding part; 1402 - Terminal post connection part; 141 - First pin; 142 - Second pin; 151 - First limiting member; 1511 - Conducting surface; 152 - Second limiting member; 1521 - Second connecting part; 160 - Insulating layer; 1601 - First connecting part; 170 - Insulating member; x - First direction; y - Second direction; z - Third 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] The individual battery cell is a crucial component of the battery pack. The inventors discovered that, under the influence of the electrode body, the pins connected to the electrode body are prone to displacement in the third direction (z), causing the pins to detach from the top cover and reducing the structural strength of the individual battery cell.

[0025] To solve the above technical problems, such as Figure 1 and Figure 2 As 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.

[0026] 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.

[0027] 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.

[0028] Combination Figure 3 and Figure 4 As shown, the single cell 100 includes a housing 110, a top cover 130, an electrode assembly 120, an insulating component 170, two pins 140, and a first limiting component 151.

[0029] The top cover 130 is connected to the housing 110 and is used to close the housing 110. The electrode assembly 120 is located inside the housing 110 and includes an electrode body 122, a first electrode tab 1211 and a second electrode tab 1212. The first electrode tab 1211 and the second electrode tab 1212 are respectively connected to the two ends of the electrode body 122 along the first direction x.

[0030] The insulating element 170 is located inside the housing 110 and is disposed on the side of the top cover 130 near the electrode body 122.

[0031] Combination Figure 10 and Figure 11 As shown, two pins 140 are located inside the housing 110, and the pins 140 are located on the side of the insulator 170 near the electrode body 122. One pin 140 is electrically connected to the first electrode tab 1211, and the other pin 140 is electrically connected to the second electrode tab 1212. For example, the two pins 140 are respectively the first pin 141 and the second pin 142, with the first pin 141 electrically connected to the first electrode tab 1211 and the second pin 142 electrically connected to the second electrode tab 1212.

[0032] The first limiting member 151 is located inside the housing 110. The first limiting member 151 is connected to the side of the insulating member 170 near the electrode body 122, and the first limiting member 151 abuts against the pin 140.

[0033] The single-cell battery 100 provided in the embodiments of this application, by fixing the first limiting member 151 to the side of the insulating member 170 near the electrode body 122 and making the first limiting member 151 abut against the pin 140, restricts the displacement of the pin 140 in the third direction z. In this way, the problem of structural instability caused by the displacement of the pin 140 in the third direction z is overcome, thereby improving the overall structural strength and reliability of the single-cell battery 100, extending the service life of the single-cell battery 100, and improving the user experience.

[0034] like Figure 1 and Figure 4As shown, in one embodiment, the single-cell battery 100 further includes two terminals 131, which are disposed on the top cover 130. The two terminals 131 are electrically connected to two pins 140, respectively. That is, one terminal 131 is electrically connected to one pin 140, and the other terminal 131 is electrically connected to the other pin 140, so as to realize the electrical connection between the terminal 131 and the electrode assembly 120. The first limiting member 151 is located on the side of the insulating member 170 away from the terminal 131 along the first direction x.

[0035] In this embodiment, by setting the first limiting member 151 on the side of the insulating member 170 away from the pole post 131 along the first direction x, the first limiting member 151 and the pole post 131 are spaced apart, so as not to affect the installation of the pole post 131 and to facilitate the assembly of the single cell 100.

[0036] like Figure 9 As shown, in some embodiments, the first limiting member 151 has a guiding surface 1511 on the side facing the electrode body 122. In this embodiment, a guiding surface 1511 is provided on one side of the first limiting member 151. The guiding surface 1511 can be a slope or an arc surface to prevent the first limiting member 151 from damaging other components of the single cell 100 during assembly, thereby improving the reliability of the single cell 100.

[0037] like Figure 2 , Figure 8 and Figure 9 As shown, in some embodiments, the single cell 100 also has a second direction y that is perpendicular to the first direction x, the first limiting member 151 extends along the second direction y, and the length of the first limiting member 151 along the second direction y is greater than half the length of the pin 140 along the second direction y.

[0038] In this embodiment, the length of the first limiting member 151 along the second direction y is greater than half the length of the pin 140 along the second direction y. This increases the contact area between the first limiting member 151 and the pin 140, thereby better limiting the possibility of the pin 140 being displaced in the third direction z.

[0039] like Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the single cell 100 also has a second direction y that is perpendicular to the first direction x. The single cell 100 also includes a second limiting member 152, which is connected to the side of the pin 140 near the electrode body 122. The second limiting member 152 extends along the second direction y and is connected to the electrode body 122.

[0040] In this embodiment, based on the first limiting member 151, the second limiting member 152 acts as a clamping and limiting element for the electrode body 122, thereby improving the overall structural strength of the electrode body 122 and the pins 140. This enhances the overall structural strength and reliability of the single cell 100.

[0041] like Figure 8 , Figure 10 , Figure 11 and Figure 12 As shown, in some embodiments, pin 140 includes a connected terminal post connection portion 1402 and a tab welding portion 1401. The tab welding portion 1401 is located on the side of the terminal post connection portion 1402 near the electrode assembly 120. The terminal post connection portion 1402 is electrically connected to the terminal post 131. The tab welding portions 1401 of the two pins 140 are electrically connected to the first tab 1211 and the second tab 1212, respectively. That is, one tab welding portion 1401 is electrically connected to the first tab 1211, and the other tab welding portion 1401 is electrically connected to the second tab 1212. The second limiting member 152 is connected to the tab welding portion 1401 along the first direction x on the side near the electrode body 122.

[0042] It is understandable that the second limiting member 152 is connected to the side of the electrode body 122 of the electrode tab welding part 1401, that is, the second limiting member 152 can be connected to the electrode body 122, so that the two second limiting members 152 at both ends along the second direction y form a clamping and limiting effect on the electrode body 122, preventing the electrode body 122 from being displaced in the second direction y, thereby improving the structural strength of the single cell 100.

[0043] like Figure 7 and Figure 10 As shown, in some embodiments, the single cell 100 further includes an insulating layer 160, which is connected to the second limiting member 152 along the first direction x on the side close to the electrode body 122, and the insulating layer 160 abuts against the electrode body 122 along the first direction x.

[0044] It should be noted that the insulating layer 160 can be an insulating coating provided on the second limiting member 152.

[0045] In this embodiment, based on the first limiting member 151 and the second limiting member 152, an insulating layer 160 is provided between the electrode body 122 and the second limiting member 152. In this embodiment, the insulating layer 160 is an insulating plate, which has a better insulating effect than an insulating coating. The insulating layer 160 can be fixedly connected to the second limiting member 152 and the electrode body 122 with adhesive. In this way, when the single cell 100 is impacted, it prevents the pin 140 from potentially inserting into the electrode body 122 and causing a short circuit. With the provision of the insulating layer 160, when the single cell 100 is impacted, the pin 140 will first contact the insulating layer 160, achieving an insulating effect and also protecting the electrode body 122.

[0046] like Figure 10 and Figure 11 As shown, in the embodiment of the insulating layer 160 described above, the single cell 100 also has a third direction z that is mutually perpendicular to both the first direction x and the second direction y. The insulating layer 160 extends along the third direction z, and the length of the insulating layer 160 along the third direction z is greater than the length of the second limiting member 152 along the third direction z. In this way, insulation protection can be formed on both sides of the electrode body 122 along the second direction y. Here, the insulating layer 160 is an insulating plate.

[0047] like Figure 12 and Figure 13 As shown, in some embodiments, the insulating layer 160 is provided with at least one first connecting portion 1601 on the side near the second limiting member 152, and the second limiting member 152 is provided with at least one second connecting portion 1521 on the side near the insulating layer 160, and one first connecting portion 1601 is connected to one second connecting portion 1521.

[0048] In this embodiment, the insulating layer 160 and the second limiting member 152 are connected via the first connecting portion 1601 and the second connecting portion 1521. Exemplarily, there is one first connecting portion 1601 and one second connecting portion 1521. Of course, in other embodiments, there can be two or three first connecting portions 1601, and two or three second connecting portions 1521, etc. The number of second connecting portions 1521 is equal to the number of first connecting portions 1601. Two or three connections provide better connectivity than one.

[0049] For example, such as Figure 12 and Figure 13 As shown, the first connecting part 1601 is a positioning post, and the second connecting part 1521 is a positioning hole. The positioning post is inserted into the positioning hole to connect the insulating layer 160 and the second limiting member 152. Of course, after the insulating layer 160 and the second limiting member 152 are connected, the first connecting part 1601 and the second connecting part 1521 can be further fixed by adhesive bonding.

[0050] In the embodiment described above with the second limiting member 152, the projected area of ​​the second limiting member 152 along the second direction y on the tab welding portion 1401 is smaller than the area of ​​the side of the tab welding portion 1401 facing away from the tab 121. This reduces the space occupied by the second limiting member 152 inside the housing 110 and also reduces the weight of the single battery cell.

[0051] 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 131 may include a positive electrode post 131 and a negative electrode post 131, and the electrode assembly 120 may be manufactured using a winding process or a stacking process. The tab 121 includes a first tab 1211 and a second tab 1212, one of which is a positive tab and the other a negative tab. The electrode body 122 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.

[0052] 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.

[0053] To address the aforementioned issues, this application also provides a battery pack, including the single battery cell 100 from any of the above embodiments.

[0054] The battery pack provided in the embodiments of this application includes a single battery cell 100 as described in any of the above embodiments. Since the pin 140 of the single battery cell 100 is located on the side of the insulating member 170 near the electrode body 122, and the first limiting member 151 is connected to the side of the insulating member 170 near the electrode body 122, and simultaneously abuts against the pin 140, the provision of the first limiting member 151 overcomes the problem of structural instability caused by the pin 140 undergoing a third-direction z-displacement, thereby improving the structural strength of the single battery cell 100. Furthermore, the battery pack of this embodiment also possesses all the beneficial effects of the single battery cell 100 in any of the above embodiments, which will not be elaborated upon here.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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.

[0056] 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 (130) is connected to the housing (110); An electrode assembly (120) is located inside the housing (110), and the electrode assembly (120) includes an electrode body (122), a first electrode tab (1211) and a second electrode tab (1212), wherein the first electrode tab (1211) and the second electrode tab (1212) are respectively connected to the two ends of the electrode body (122) along the first direction (x); An insulating element (170) is located inside the housing (110), and the insulating element (170) is disposed on the side of the top cover (130) near the electrode body (122); Two pins (140) are located inside the housing (110). The pins (140) are located on the side of the insulating member (170) near the electrode body (122). One of the two pins (140) is electrically connected to the first tab (1211), and the other pin (140) is electrically connected to the second tab (1212). The first limiting member (151) is located inside the housing (110). The first limiting member (151) is connected to the side of the insulating member (170) near the electrode body (122), and the first limiting member (151) abuts against the pin (140).

2. The single-cell battery according to claim 1, characterized in that, The single battery also includes two terminals (131), which are disposed on the top cover (130), and the two terminals (131) are electrically connected to the two pins (140) respectively; The first limiting member (151) is located on the side of the insulating member (170) away from the pole post (131) along the first direction (x).

3. The single-cell battery according to claim 1, characterized in that, The first limiting member (151) has a guide surface (1511) on the side facing the electrode body (122).

4. The single-cell battery according to claim 1, characterized in that, The single cell also has a second direction (y) perpendicular to the first direction (x), the first limiting member (151) extends along the second direction (y), and the length of the first limiting member (151) along the second direction (y) is greater than half the length of the pin (140) along the second direction (y).

5. The single-cell battery according to claim 2, characterized in that, The single cell also has a second direction (y) perpendicular to the first direction (x), and the single cell also includes a second limiting member (152), which is connected to the side of the pin (140) near the electrode body (122); the second limiting member (152) extends along the second direction (y) and is connected to the electrode body (122).

6. The single-cell battery according to claim 5, characterized in that, The pin (140) includes a connected pole post connection portion (1402) and a tab welding portion (1401). The tab welding portion (1401) is located on the side of the pole post connection portion (1402) near the electrode assembly (120). The pole post connection portion (1402) is electrically connected to the pole post (131). The tab welding portions (1401) of the two pins (140) are electrically connected to the first tab (1211) and the second tab (1212) respectively. The second limiting member (152) is connected to the tab welding portion (1401) along the first direction (x) near the electrode body (122).

7. The single-cell battery according to claim 5, characterized in that, The single cell also includes an insulating layer (160), which is connected to the second limiting member (152) along the first direction (x) on the side close to the electrode body (122), and the insulating layer (160) abuts against the electrode body (122) along the first direction (x).

8. The single-cell battery according to claim 7, characterized in that, The single cell also has a third direction (z) that is perpendicular to both the first direction (x) and the second direction (y). The insulating layer (160) extends along the third direction (z), and the length of the insulating layer (160) along the third direction (z) is greater than the length of the second limiting member (152) along the third direction (z).

9. The single-cell battery according to claim 7, characterized in that, The insulating layer (160) has at least one first connecting portion (1601) on the side near the second limiting member (152), and the second limiting member (152) has at least one second connecting portion (1521) on the side near the insulating layer (160). One first connecting portion (1601) is connected to one second connecting portion (1521).

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

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