Single battery and electric device

Abstract

The application discloses a single battery and an electric device. The single battery comprises a shell and a pole, the shell comprises a cover plate and a shell body, and the pole penetrates through the cover plate; an electric core is arranged in the shell; a first insulating piece and a second insulating piece are arranged, the first insulating piece surrounds a tab and abuts against and covers at least part of the cover plate and the shell body, and the second insulating piece is provided with a protruding area to abut against the first insulating piece; the width of the first insulating piece on the side of the protruding area towards the pole is L1, the width of the first insulating piece on the side of the protruding area towards the shell body is L2, and the range of L1 / L2 is 0.2-0.64. Through cooperation of the first insulating piece and the second insulating piece, insulation of the tab, the pole and the shell in the single battery is realized, the first insulating piece and the second insulating piece are in contact through the protruding area, a good heat dissipation channel and a certain expansion space are provided, and the safety of the single battery in the operation process is improved.

Description

Technical Field

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

[0002] The casing of a single battery cell is mostly made of metal. The cells inside are connected to the terminals that protrude from the casing via tabs. To avoid short circuits, the tabs and terminals need to be insulated from the casing. However, filling the casing with insulating material can lead to poor heat dissipation around the tabs, which generate a lot of heat. As a result, the battery is prone to operating at high temperatures for a long time, which affects its operational stability and lifespan.

[0003] Therefore, how to improve the safety of individual battery cells during use is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single-cell battery and an electrical device to improve the safety of using the single-cell battery.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A single-cell battery, comprising:

[0007] The housing includes a cover plate and a casing, and the pole passes through the cover plate;

[0008] The battery cell is located inside the casing and connected to the terminal block via tabs;

[0009] A first insulating member and a second insulating member are provided. The first insulating member is arranged around the electrode tab and abuts against and covers at least part of the cover plate and the housing. The second insulating member is partially placed between the inner side of the cover plate and the electrode post. The second insulating member has a raised area in a direction perpendicular to the cover plate, and the raised area abuts against the first insulating member. The width of the first insulating member in the area of ​​the raised area facing the electrode post is L1, and the width of the first insulating member in the area of ​​the raised area facing the housing is L2. Then the range of L1 / L2 is 0.2-0.64.

[0010] As can be seen from the above technical solution, one aspect of this disclosure provides a single-cell battery, which mainly includes a casing, terminals, a cell, a first insulating member, and a second insulating member. Specifically, the casing includes a cover plate and a housing. The terminals are disposed through the cover plate to connect with the cell from the inside and to connect with other components from the outside. Inside the casing, the terminals and the cell are connected through tabs. The first insulating member and the second insulating member cooperate to achieve insulation between the casing and other structures. The first insulating member has an opening in the middle area to surround the tabs. At the same time, the first insulating member abuts against and covers at least part of the cover plate 110 and the housing 120, so that it can simultaneously provide insulation protection for part of the tabs and terminals from the direction of the cover plate and the housing. A part of the second insulating member is placed between the inner side of the cover plate and the terminals to form an insulation limiting structure to improve insulation stability. At the same time, the second insulating member abuts against and cooperates with the first insulating member. The separate first insulating member and the second insulating member can reduce the size of a single piece and reduce the risk of local detachment caused by the excessive size of the single insulating structure. Specifically, the second insulating member has a raised area in a direction perpendicular to the cover plate. The raised area is only provided in a part of the second insulating member, and the second insulating member abuts against the first insulating member through the raised area to form a channel between the first insulating member and the second insulating member. This allows airflow to flow smoothly to ensure temperature uniformity within the single cell and optimize the heat dissipation effect of the single cell. Furthermore, based on this, taking the raised area in contact with the first insulating component as the boundary, the width of the first insulating component in the area facing the terminal post of the raised area is L1, and the width of the first insulating component in the area facing the casing of the raised area is L2. The range of L1 / L2 is 0.2-0.64. It should be noted that if the ratio of L1 to L2 is too small, the width of the first insulating component in the area facing the terminal post of the raised area is small, that is, the pressing range of the first and second insulating components is small, which poses a risk of failure of the raised area to abut the first insulating component during the operation of a single battery. On the other hand, if the ratio of L1 to L2 is too large, the width of the first insulating component in the area facing the terminal post of the raised area is large. When welding the casing, terminal post, and other structures, pressure will be exerted on the area of ​​the first insulating component in the area facing the terminal post of the raised area, resulting in a longer protruding structure of the first insulating component that exceeds the effective abutment range of the raised area, causing part of the first insulating component to fall off and affect battery safety. Therefore, the range of L1 / L2 is limited to 0.2-0.64 to balance the contact effect and fit strength between the first insulating component and the raised area, thereby improving the safety of the single cell during operation. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a single battery structure provided in an embodiment of the present invention;

[0013] Figure 2 An exploded view of the location of the cover plate of a single battery cell according to an embodiment of the present invention;

[0014] Figure 3 A schematic diagram of the mating structure of the first insulating member and the second insulating member provided in an embodiment of the present utility model;

[0015] Figure 4 This is a schematic diagram of the cross-sectional structure of a single battery cell provided in an embodiment of the present invention;

[0016] Figure 5 for Figure 4 Detailed map of area A in the document;

[0017] Figure 6 for Figure 5 A schematic diagram showing the fit between the first insulating component and the raised area;

[0018] Figure 7 A schematic diagram of the installation structure of the second insulating member and the pole post provided in an embodiment of this utility model;

[0019] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure;

[0020] Figure 9 This is a schematic diagram of a second insulating component with two sets of raised areas provided in an embodiment of the present invention.

[0021] in:

[0022] 10-Outer shell; 110-Cover plate; 120-Shell; 20-Position post; 30-Cell; 40-Taper; 50-First insulating component; 510-Connecting area; 520-Extension area; 60-Second insulating component; 610-Protruding area; 70-Support ring. Detailed Implementation

[0023] The core of this application is to disclose a single-cell battery and an electrical device to improve the safety of using the single-cell battery.

[0024] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0025] like Figure 1 and Figure 2 As shown, one aspect of this disclosure provides a single-cell battery, which mainly includes a casing 10, terminals 20, a cell 30, a first insulating member 50, and a second insulating member 60. The casing 10 includes a cover plate 110 and a housing 120, which are two connected walls. For common square or cylindrical batteries, the cover plate 110 and housing 120 are connected perpendicularly. In a specific embodiment of this disclosure, the single-cell battery is a cylindrical battery, and the cover plate 110 is an end cap on the battery, while the housing 120 is a side wall of the battery, to protect the internal structure.

[0026] Based on this structure, such as Figure 2 As shown, the electrode post 20 passes through the cover plate 110 for connection to an external circuit to achieve power output or input; the battery cell 30 is disposed inside the housing 10 and is electrically connected to the electrode post 20 via the tab 40. Figure 3 , Figure 4 and Figure 5As shown, the first insulating member 50 and the second insulating member 60 cooperate to achieve insulation between the outer shell 10 and other structures. Specifically, the first insulating member 50 has an opening and is arranged around the tab 40. At the same time, a portion of the first insulating member 50 is arranged at the junction area of ​​the cover plate 110 and the shell 120, so that the first insulating member 50 can abut against and cover at least part of the cover plate 110 and the shell 120, thereby effectively isolating the tab 40 from the cover plate 110 and the shell 120 of the outer shell 10, thereby preventing safety problems caused by short circuit between the tab 40 and the outer shell 10, such as battery overheating and fire. The second insulating element 60 is used to achieve further insulation and support the first insulating element 50. Specifically, a portion of the structure of the second insulating element 60 is placed between the inner side of the cover plate 110 and the pole post 20. It should be noted that although the first insulating element 50 has contact with both the cover plate 110 and the cover plate 110, a longer extension on the cover plate 110 would reduce the connection strength of the first insulating element 50 and pose a risk of detachment when welding in some areas of the pole post 20. Therefore, the extension distance of the first insulating element 50 on the cover plate 110 is relatively short. Its main purpose is to provide insulation and isolation between the contact area between the cover plate 110 and the housing 120 and the pole tab 40, while still maintaining a certain distance from the outer wall of the pole post 20. The second insulating element 60, placed between the inner side of the cover plate 110 and the pole post 20, can withstand pressure during the installation of the pole post 20, forming a pressing and limiting structure between the pole post 20 and the inner side of the cover plate 110 to maintain positional stability.

[0027] Meanwhile, the side of the second insulating member 60 away from the pole post 20 extends toward the housing 120, and the area of ​​it that is not pressed by the inner side of the cover plate 110 and the pole post 20 abuts against the first insulating member 50, so that the first insulating member 50 is stably and effectively supported in the direction perpendicular to the cover plate 110, thereby reducing the risk of the first insulating member 50 falling off.

[0028] It should be noted that the separate first insulating component 50 and second insulating component 60, while providing insulation protection between the outer shell 10 and the internal electrode tabs 40, electrode posts 20 and other structures, reduce the size of individual insulating components through the separate structure. This not only makes production and assembly easier, but also avoids the risk of local detachment caused by excessively large individual insulating structures being subjected to stress during the installation of electrode posts 20. Specifically, for the first insulating member 50 and the second insulating member 60 that abut against each other, the second insulating member 60 is provided with a raised area 610 in the direction perpendicular to the cover plate 110. The raised area 610 is only provided in a part of the second insulating member 60, not the entire area, so that the second insulating member 60 can abut against the first insulating member 50 through the partial raised area 610. A gap and channel structure is formed between the first insulating member 50 and the second insulating member 60. On the one hand, the gap structure can form a certain gas storage space inside the outer casing 10, reducing the risk of bulging caused by gas generation inside the single battery during use. On the other hand, the channel formed between the first insulating member 50 and the second insulating member 60 can allow airflow to flow smoothly, and the areas inside the outer casing 10 are connected. When the local temperature is high, heat can be transferred to the low temperature area in time through the connected path, thereby improving the temperature uniformity inside the single battery and optimizing the heat dissipation effect of the single battery.

[0029] At the same time, based on the above structure, such as Figure 5 and Figure 6As shown, taking the raised area 610 in contact with the first insulating member 50 as the boundary, the width of the region on the first insulating member 50 located on the side of the raised area 610 facing the pole post 20 is L1, where the width refers to the span area along the radial direction of the pole post 20; and the width of the region on the first insulating member 50 located on the side of the raised area 610 facing the housing 120 is L2. Therefore, the range of L1 / L2 is 0.2-0.64. It should be noted that the region of the first insulating member 50 corresponding to the raised area 610 can be subjected to a stabilizing effect, while the regions on both sides of the raised area 610, such as L1 and... If the ratio of L2 is too small, it means that the width of the area on the side of the raised area 610 facing the terminal post 20 on the first insulating member 50 is small. That is, the pressing range of the first insulating member 50 and the second insulating member 60 is small. During the assembly process of the terminal post 20 and during the operation of the single cell, when the first insulating member 50 and the second insulating member 60 are subjected to force and shift, the raised area 610 is at risk of slipping and leaving the coverage area of ​​the first insulating member 50. This will cause the raised area 610 to fail to abut against the first insulating member 50, and the first insulating member 50 to fall off locally, thus affecting the insulation stability. If the ratio of L1 to L2 is too large, the width of the first insulating component 50 in the area of ​​the raised region 610 facing the terminal post 20 will be too large. Although this can maintain the contact and fit between the raised region 610 and the first insulating component 50, the welding of the outer casing 10, terminal post 20, and other structures will exert pressure on the area of ​​the first insulating component 50 in the area of ​​the raised region 610 facing the terminal post 20. This will result in a longer protruding structure of the first insulating component 50, exceeding the effective contact range of the raised region 610, causing part of the first insulating component 50 to detach and fall off, affecting the insulation safety of the battery. Therefore, this embodiment limits the range of L1 / L2 to 0.2-0.64 to balance the contact effect and fit strength between the first insulating component 50 and the raised region 610, thereby improving the insulation safety and operational stability of the single battery cell.

[0030] Furthermore, the raised area 610 is the structural basis for the stable support of the second insulator 60 to the first insulator 50. Its width in the radial direction of the pole post 20 directly affects its support effect on the first insulator 50. In some embodiments of this disclosure, the width L3 of the raised area 610 ranges from 0.3mm to 8mm, specifically 0.3mm, 1mm, 3mm, 5mm, 7mm, and 8mm. It should be noted that when L3 is less than 0.3mm, the width of the raised area 610 is relatively narrow, which may result in insufficient support and contact between the second insulator 60 and the first insulator 50, thereby affecting the stability of the entire insulation system. The first insulator 50 may shift during battery operation due to insufficient support, leading to a decrease in insulation effect and a risk of short circuit. When L3 is greater than 8mm, the width of the raised area 610 is relatively wide, occupying more internal space, resulting in a smaller channel space, weakened heat dissipation, and potentially an increase in the overall battery volume, affecting its compatibility with devices. Therefore, limiting the width L3 of the raised area 610 to the range of 0.3mm-8mm can ensure the effective support and contact of the second insulating member 60 with the first insulating member 50, ensuring the stability and reliability of the insulation system, while also meeting the heat dissipation requirements, reducing material consumption, and further improving the overall performance and market competitiveness of the battery.

[0031] In some embodiments of this disclosure, the width L1 of the area on the first insulating member 50 located on the side of the raised area 610 facing the pole post 20 ranges from 0.5mm to 4mm, specifically 0.5mm, 1.5mm, 2.5mm, 3.5mm, and 4mm. It should be noted that the length range of L1 needs to meet the stable pressing effect between the first insulating member 50 and the raised area 610, and cannot be too long, which would result in a large overhang structure due to the long raised area 610, leading to the risk of warping and falling off during assembly. The width L2 of the first insulating member 50 located in the area of ​​the protrusion 610 facing the housing 120 ranges from 1.2mm to 10mm, specifically 1.2mm, 3mm, 5mm, 7mm, and 10mm. Similarly, the length L1 needs to satisfy the filling and covering of other areas on the cover plate 110 by the first insulating member 50, so that the extension length of the first insulating member 50 can stably abut against the connection area between the cover plate 110 and the housing 120, thereby achieving the surrounding insulation effect of the first insulating member 50. In order to improve the insulation protection effect of the first insulating member 50 on the interior of the housing 10, in some embodiments of this disclosure, the first insulating member 50 includes a connecting area 510 and an extension area 520. The connecting area 510 is an annular structure and is fitted to the inner side area of ​​the cover plate 110. The annular connection area 510 surrounds the pole post 20 and is spaced apart from the pole post 20. The protrusion 610 of the second insulating member 60 abuts against the connecting area 510 to support the first insulating member 50. The extension area 520 is bent in a direction perpendicular to the connection area 510 and fits the inner side of the housing 120. The bent connection area 510 and extension area 520 can better fit the contact area of ​​the cover plate 110 and the housing 120, achieving the fitting effect of two different planar walls, and forming an insulation barrier with a wider coverage area with the second insulating member 60.

[0032] It should also be noted that the first insulating member 50, which has a connection area 510 and an extension area 520, provides protection for the contact areas of the two walls inside the housing 10. In order to further optimize the protective effect of the first insulating member 50 on the tab 40, considering that the tab 40 has a two-layer insulating protective structure of the first insulating member 50 and the second insulating member 60 in the direction perpendicular to the cover plate 110, but there is still a risk of short circuit between the tab 40 and the housing 10 in the radial direction of the pole post 20, in some embodiments of this disclosure, the projection of the tab 40 on the housing 120 is completely within the range of the extension area 520. Since the extension area 520 is attached to the inner side of the housing 120, the tab 40 will be isolated and protected by the extension area 520 when it undergoes radial displacement, which can effectively prevent the tab 40 from contacting the housing 120 and avoid safety problems such as overheating or fire caused by short circuit between the tab 40 and the housing 10, thereby improving the insulating protection effect of the first insulating member 50.

[0033] Furthermore, in the single-cell battery provided in the embodiments of this disclosure, the second insulating member 60 effectively supports the first insulating member 50 through the raised area 610. In order to improve the uniformity of the support structure, several raised areas 610 are provided and are evenly distributed around the pole post 20 along the circumference. Taking a specific embodiment of this disclosure as an example, four raised areas 610 are provided. The central angle of the fan-shaped area formed by two adjacent raised areas 610 and the axis of the pole post 20 is 90°. The four raised areas 610 evenly distributed around the pole post 20 bear the same or similar support areas. The first insulating member 50 is evenly supported by four points in the annular area surrounding the pole post 20, thus having better structural stability and reducing the risk of the first insulating member 50 falling off the inside of the cover plate 110 due to force.

[0034] Furthermore, it should be noted that the raised area 610 can be a rectangular, rhomboid, elliptical, or circular structure. Based on the pole post 20 structure of a regular rotating body, the raised area 610 can also be set as a toroidal structure. The center of the raised area 610 is located on the axis of the pole post 20, so that the multiple pole posts 20 have a more regular and uniform structure and a more stable supporting effect.

[0035] Based on the above embodiments, a group of raised areas 610 at the same distance from the axis of the pole post 20 is formed, that is, the four raised areas 610 in the previous embodiments form a group. In order to optimize the load-bearing effect of the raised areas 610, in some embodiments of this disclosure, such as Figure 9 As shown, two sets of raised areas 610 are arranged at intervals in the radial direction of the electrode post 20. The number of the two sets of raised areas 610 may be the same or different. When the number of the two sets of raised areas 610 is the same, they can be arranged in a straight line in the radial direction of the electrode post 20, or they can be arranged alternately. At the same time, the first insulating member 50 abuts against both sets of raised areas 610, so that it has a larger contact area with the second insulating member 60, reducing the risk of the first insulating member 50 falling off. In particular, the two sets of raised areas 610 arranged alternately can achieve a more precise and stable contact support effect for the first insulating member 50. At the same time, since the raised areas 610 are partially arranged on the second insulating member 60, their area occupies a small area. The arrangement of the two sets of raised areas 610 can still maintain a large gap area between the first insulating member 50 and the second insulating member 60, without causing a serious obstruction effect on airflow, thus ensuring the temperature uniformity inside the single cell.

[0036] Furthermore, in the single-cell battery provided in this embodiment, the first insulating member 50 and the second insulating member 60 are made of elastic materials, specifically PPS (polyphenylene sulfide), LCP (liquid crystal polymer), and PP (polypropylene) or a combination thereof; and the elastic modulus of the first insulating member 50 and the second insulating member 60 is 3GPa-10GPa, specifically 3GPa, 5GPa, 7GPa, and 10GPa. It should be noted that the first insulating member 50 and the second insulating member 60, which have a certain elasticity, can not only provide a certain sealing effect through elastic deformation during the pressing process, but also absorb the expansion amount through elastic deformation when the cell 30 inside the outer casing 10 expands during use, thereby reducing the risk of expansion and bulging of the outer casing 10. It should also be noted that the elastic modulus of the first insulating component 50 and the second insulating component 60 is limited to 3GPa-10GPa. This is to prevent the elastic modulus of the first insulating component 50 and the second insulating component 60 from being too large, resulting in high stiffness and an inability to effectively absorb the expansion of the battery cell 30, which could still lead to bulging of the battery casing 10. Conversely, it also prevents the elastic modulus of the first insulating component 50 and the second insulating component 60 from being too small, resulting in low hardness and an inability to achieve effective compression support under limited force, which could lead to insufficient stability of the support structure and the risk of detachment and failure. Therefore, limiting the elastic modulus of the first insulating component 50 and the second insulating component 60 to 3GPa-10GPa balances the energy absorption and structural strength requirements of the first insulating component 50 and the second insulating component 60.

[0037] It should also be noted that the elastic modulus of the first insulating component 50 and the second insulating component 60 can be the same, as they have the same stiffness effect. During deformation, they can more evenly absorb the expansion, thus avoiding excessive expansion and failure of a single insulating component. Similarly, the elastic modulus of the first insulating component 50 and the second insulating component 60 can also be different, as long as their elastic modulus is kept within the range of 3GPa-10GPa, the requirements can be met.

[0038] Furthermore, in some embodiments of this disclosure, a current collector can be provided between the terminal post 20 and the tab 40. The current collector connects the tab 40 and the terminal post 20 to efficiently conduct current, ensuring that electrical energy can be stably and quickly transferred from the cell 30 to the terminal post 20, and then transmitted to the external circuit. Based on this structure, the current collector can cover the area where the tab 40 is located, while the second insulating member 60 abuts against the current collector in a direction perpendicular to the cover plate 110 to provide insulation protection for the current collector and the outer casing 10. It should be noted that the current collector can also be integrated with the terminal post 20 to reduce the assembly difficulty of the single battery cell.

[0039] Considering that the installation of the pole post 20 involves pressing and welding, and that the installation force of the pole post 20 is directly transmitted through the outer casing 10 to the areas where the first insulating member 50 and the second insulating member 60 are installed, this can damage the structure of the first insulating member 50 and the second insulating member 60, resulting in a decrease in insulation performance. Therefore, in some embodiments of this disclosure, such as... Figure 7 and Figure 8 As shown, the single cell also includes a rigid support ring 70 made of metal, ceramic, or other materials. The support ring 70 specifically surrounds the terminal post 20 and is placed between the terminal post 20 and the second insulator 60 in a direction perpendicular to the cover plate 110. Specifically, it is located on the bottom of the housing 120 away from the cover plate 110. The support ring 70 contacts the terminal post 20 and supports the second insulator 60. The force exerted on the terminal post 20 during installation can be absorbed by the rigid support ring 70, while the force exerted on the second insulator 60 is small, reducing the risk of damage to the second insulator 60.

[0040] Furthermore, in some embodiments of this disclosure, the single battery cell has a cylindrical battery structure, and the cover plate 110 is one end circular surface of the cylindrical battery, the housing 120 is the side wall surface of the cylindrical battery, and the terminal post 20 passes through the central region of the cover plate 110 and extends out. Correspondingly, the first insulating member 50 and the second insulating member 60 are both rotating bodies, and their rotation axes are collinear with the axis of the cover plate 110, so as to adapt to the circular structure of the cover plate 110 and have a close or equal distance with each area of ​​the terminal post 20, the tab 40 and other components, thus providing a more uniform insulation effect to each area of ​​the above components, thereby improving the safety of the single battery cell.

[0041] Furthermore, another aspect of this disclosure provides an electrical device that includes a single battery provided in any of the above embodiments for power supply. It should be noted that since the single battery has the technical effects provided in any of the above embodiments, the electrical device also has the technical effects provided in any of the above embodiments, and will not be repeated here.

[0042] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-cell battery, characterized in that, include: The outer casing (10) and the pole post (20) are provided, the outer casing (10) including a cover plate (110) and a housing (120), the pole post (20) passing through the cover plate (110). The battery cell (30) is disposed inside the housing (10) and connected to the terminal post (20) via the tab (40); A first insulating member (50) and a second insulating member (60) are provided. The first insulating member (50) is disposed around the electrode tab (40) and abuts against and covers at least part of the cover plate (110) and the housing (120). The second insulating member (60) is partially padded between the inner side of the cover plate (110) and the electrode post (20). The second insulating member (60) is provided with a raised area (610) in a direction perpendicular to the cover plate (110), and the raised area (610) abuts against the first insulating member (50). The width of the first insulating member (50) in the area of ​​the raised area (610) facing the electrode post (20) is L1, and the width of the first insulating member (50) in the area of ​​the raised area (610) facing the housing (120) is L2. The range of L1 / L2 is 0.2-0.

64.

2. The single-cell battery as described in claim 1, characterized in that, The width of the raised area (610) is L3, and the range of L3 is 0.3mm-8mm.

3. The single-cell battery as described in claim 2, characterized in that, The range of L1 is 0.5mm-4mm, and / or the range of L2 is 1.2mm-10mm.

4. The single-cell battery as described in claim 1, characterized in that, The first insulating member (50) includes a connecting area (501) and an extension area (520). The connecting area (501) is an annular structure and is fitted to the inner side of the cover plate (110). The protruding area (610) abuts against the connecting area (501). The extension area (520) is bent in a direction perpendicular to the connecting area (501) and fits to the inner side of the housing (120).

5. The single-cell battery as described in claim 4, characterized in that, The projection of the tab (40) onto the housing (120) lies entirely within the range of the extension area (520).

6. The single-cell battery as described in claim 1, characterized in that, The raised area (610) surrounds the pole post (20) and is evenly distributed in several places along the circumference of the pole post (20).

7. The single-cell battery as described in claim 6, characterized in that, Two sets of raised areas (610) are arranged radially on the pole post (20), and the first insulating member (50) simultaneously abuts against both sets of raised areas (610).

8. The single-cell battery as described in claim 1, characterized in that, The first insulating element (50) and the second insulating element (60) are made of one or a combination of polyphenylene sulfide, liquid crystal polymer and polypropylene, and the elastic modulus of the first insulating element (50) and the second insulating element (60) is 3GPa-10GPa.

9. The single-cell battery as described in claim 1, characterized in that, A current collector is provided between the pole post (20) and the tab (40), and the current collector is conductively connected to the tab (40) and the pole post (20).

10. The single-cell battery as described in claim 1, characterized in that, It also includes a rigid support ring (70) disposed close to and around the pole post (20) and positioned between the pole post (20) and the second insulating member (60) in a direction perpendicular to the cover plate (110).

11. The single-cell battery as described in claim 1, characterized in that, The single cell is a cylindrical cell, the cover plate (110) is the circular surface of one end of the cylindrical cell, and the shell (120) is the side wall surface of the cylindrical cell.

12. The single-cell battery as described in claim 11, characterized in that, The pole post (20) is arranged through the center of the cover plate (110), and the axes of the first insulating member (50) and the second insulating member (60) are collinear with the axis of the cover plate (110).

13. An electrical appliance, characterized in that, It includes a single cell battery as described in any one of claims 1-12.

Images