Secondary battery and electric device

Abstract

The utility model provides a kind of secondary battery and electronic equipment, secondary battery includes shell, cover, electric core and support column, shell has first face;Cover is connected with shell, cover and shell jointly define chamber, cover has second face, second face is towards chamber, first face and second face are oppositely arranged;Electric core is located in chamber;Support column is located in chamber, support column includes first end and second end, in the axial direction of support column, at least one of first end and second end is protruding relative to electric core.The secondary battery of the utility model has higher safety, and can have higher energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a secondary battery and electrical equipment. Background Technology

[0002] A button cell battery is a type of battery shaped like a button. Button cells are typically quite thin, and when subjected to impact from heavy objects, their casings are prone to deformation, collapse, or even rupture. This deformation can compress the internal battery cells, damaging them. Damaged cells may experience internal short circuits, potentially leading to a fire. Improving the safety of button cells after impact from heavy objects is a pressing issue for the industry. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a secondary battery with high safety.

[0004] This utility model also proposes an electrical device that includes the above-mentioned secondary battery.

[0005] A secondary battery according to a first aspect of the present invention includes: a housing having a first surface; a cover connected to the housing, the cover and the housing jointly defining a chamber, the cover having a second surface facing the chamber, the first surface and the second surface being disposed opposite to each other; a battery cell located within the chamber; and a support column located within the chamber, the support column including a first end and a second end, at least one of the first end and the second end protruding relative to the battery cell in the axial direction of the support column, the first end supporting the first surface, and the second end supporting the second surface.

[0006] The secondary battery according to the first aspect of the present invention has at least the following beneficial effects: During the use of secondary batteries, they are relatively susceptible to impacts along their own axial direction (i.e., the up-down direction in the figure), such as a heavy object falling onto the secondary battery from above. In the secondary battery of this embodiment, since the support column supports the casing and cover, when the secondary battery is subjected to an axial impact, the support column can withstand a portion of the impact force, reducing the risk of the cover and casing being squeezed axially. This reduces the risk of the battery cell being damaged by compression or even experiencing an internal short circuit, thereby improving the safety of the secondary battery.

[0007] Furthermore, existing technologies typically improve the impact resistance and safety of secondary batteries by increasing the thickness of the casing and cover. This embodiment, however, employs a different approach: it adds support pillars inside the secondary battery, eliminating the need to increase the thickness of the casing and cover. Therefore, the secondary battery of this embodiment possesses both high safety and high energy density.

[0008] According to some embodiments of the present invention, the support column further includes a main body portion, the first end portion and the second end portion are respectively connected to the two end faces of the main body portion, the first end portion and / or the second end portion includes at least one piercing portion, and the cross-sectional area of ​​the piercing portion gradually decreases from the end of the piercing portion near the main body portion to the end of the piercing portion away from the main body portion.

[0009] According to some embodiments of the present invention, the first end, the second end, and the main body are interconnected, and the outer surfaces of the first end and the second end are conductors; the secondary battery further includes a first insulating sheet and a second insulating sheet, the first insulating sheet being located between the first end and the first surface, and the second insulating sheet being located between the second end and the second surface.

[0010] According to some embodiments of the present invention, the first end includes the piercing portion, the length of the piercing portion in the axial direction of the support column being greater than the thickness of the first insulating sheet; and / or, the second end includes the piercing portion, the length of the piercing portion in the axial direction of the support column being greater than the thickness of the first insulating sheet.

[0011] According to some embodiments of the present invention, the secondary battery further includes a first elastic member, which is sleeved outside the first end, one end of the first elastic member abutting against the main body, and the other end of the first elastic member protruding relative to the end of the first end away from the main body; and / or, the secondary battery further includes a second elastic member, which is sleeved outside the second end, one end of the second elastic member abutting against the main body, and the other end of the second elastic member protruding relative to the end of the second end away from the main body.

[0012] According to some embodiments of the present invention, the support column further includes a main body, the first end and the second end are respectively connected to two end faces of the main body, the battery cell is wound around the outside of the main body, and the secondary battery further includes an insulating layer, the insulating layer covers the outer peripheral surface of the main body, and the insulating layer separates the main body and the battery cell.

[0013] According to some embodiments of the present invention, the distance from the first end protruding relative to the battery cell is A, 0.2mm≤A≤1mm; and / or, the distance from the second end protruding relative to the battery cell is B, 0.2mm≤B≤1mm.

[0014] According to some embodiments of the present invention, the outer surfaces of the first end and the second end are both insulated.

[0015] According to some embodiments of the present invention, the first end abuts against the first surface, and the second end abuts against the second surface.

[0016] The electrical equipment according to the second aspect of the present invention includes a secondary battery as described in the first aspect embodiment.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a secondary battery according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of a secondary battery according to the second embodiment of the present invention; Figure 3 This is a schematic diagram of a secondary battery according to the third embodiment of the present invention; Figure 4 This is a cross-sectional view of the support column in the third embodiment; Figure 5 This is a top view of the support column in the third embodiment; Figure 6 This is a cross-sectional view of the support column and elastic element in the fourth embodiment.

[0019] Reference numerals: 101-Secondary battery, 102-Cover, 103-Shell, 104-Cell, 105-Cavity, 106-Insulating sheet, 107-First end, 108-First surface, 109-Support column, 110-Separator, 111-Negative electrode, 112-Positive electrode, 113-Second end, 114-Second surface, 115-Insulating layer, 116-Main body, 117-Piercing part, 118-First elastic element, 119-First insulating sheet, 120-Second insulating sheet, 121-Second elastic element. Detailed Implementation

[0020] The embodiments of this utility model 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 utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Figure 1 A secondary battery 101 according to a first embodiment of the present invention is shown. The secondary battery 101 is a button cell and includes a casing and a battery cell 104. The casing includes a housing 103 and a cover 102, both made of metal. The cover 102 is connected to one end of the housing 103 with an opening, and the cover 102 and housing 103 together define a chamber 105. The battery cell 104 is located within the chamber 105 and includes a positive electrode 112, a negative electrode 111, and a separator 110 stacked on top of each other, separating the positive electrode 112 and the negative electrode 111. The positive electrode 112 of the battery cell 104 can be electrically connected to the cover 102, and the negative electrode 111 of the battery cell 104 can be electrically connected to the housing 103. Thus, the cover 102 of the secondary battery 101 serves as the positive electrode, and the housing 103 of the secondary battery 101 serves as the negative electrode. It should be noted that the secondary battery 101 also includes a seal not shown in the figure. The seal is insulated and surrounds the edge of the cover 102, separating the edge of the cover 102 from the housing 103, so as to prevent the housing 103 and the cover 102 from directly contacting each other and causing the secondary battery 101 to short circuit.

[0025] like Figure 1 As shown, the secondary battery 101 also includes a support post 109 located within the chamber 105. The support post 109 includes a first end 107 and a second end 113. Axially, at least one of the first end 107 and the second end 113 protrudes relative to the battery cell 104. That is, the end of the first end 107 near the first surface 108 protrudes relative to the battery cell 104, and / or the end of the second end 113 near the second surface 114 protrudes relative to the battery cell 104. The first end 107 supports the first surface 108, and the second end 113 supports the second surface 114. The housing 103 has the first surface 108, and the cover 102 has the second surface 114. The second surface 114 is the surface of the cover 102 facing the chamber 105. Figure 1 The bottom surface of the middle cover 102 and the second surface 114 serve as the top wall of the chamber 105. The first surface 108 and the second surface 114 are arranged facing each other. The first surface 108 is the bottom surface of the inner surface of the shell and serves as the bottom wall of the chamber 105.

[0026] The support column 109 provides indirect support to the first surface 108 and the second surface 114. For example... Figure 1 As shown, in this embodiment, the secondary battery 101 further includes two insulating sheets 106. One insulating sheet 106 (first insulating sheet 119) is sandwiched between the first end 107 and the first surface 108, and the other insulating sheet 106 (second insulating sheet 120) is sandwiched between the second end 113 and the second surface 114. The support post 109 abuts against the insulating sheet 106, thereby indirectly supporting the first surface 108 or the second surface 114. In other embodiments, the support post 109 can also provide direct support for the first surface 108 and the second surface 114, that is, the first end 107 of the support post 109 is in direct contact with the first surface 108, and the second end 113 of the support post 109 is in direct contact with the second surface 114 (e.g., ...). Figure 2 (as shown in the second embodiment).

[0027] During the use of the secondary battery 101, it is relatively easy to encounter impacts along its own axial direction (i.e., the up-down direction in the figure), such as a heavy object falling onto the secondary battery 101 from above. Since the support column 109 supports the housing 103 and the cover 102, when the secondary battery 101 is subjected to an axial impact, the support column 109 can withstand part of the impact force, reducing the risk of the cover 102 and the housing 103 being squeezed in the axial direction. This reduces the risk of the cell 104 being squeezed and damaged or even experiencing an internal short circuit, thereby improving the safety of the secondary battery 101.

[0028] Furthermore, in existing technologies, the impact resistance and safety of the secondary battery 101 are typically improved by increasing the thickness of the casing 103 and the cover 102. However, this embodiment employs a different approach: a support column 109 is added inside the secondary battery 101, eliminating the need to increase the thickness of the casing 103 and the cover 102. Therefore, this embodiment is advantageous in improving the energy density of the secondary battery 101. The secondary battery 101 of this embodiment can both improve safety and achieve a higher energy density.

[0029] It should be noted that in some other embodiments (such as the second embodiment), only one of the first end 107 and the second end 113 may protrude relative to the battery cell 104. As long as at least one end of the support post 109 protrudes, it can withstand the impact before the battery cell 104 is squeezed by the cover 102 and the housing 103, reducing the risk of damage to the battery cell 104.

[0030] like Figure 1 As shown, the distance by which the first end 107 protrudes relative to the cell 104 is A, 0.2mm ≤ A ≤ 1mm. This arrangement ensures that the protrusion distance of the first end 107 is moderate, the support post 109 can effectively support the cover 102 and reduce the risk of damage to the cell 104, and the volume of the secondary battery 101 is not too large, and the energy density of the secondary battery 101 is not too low. Similarly, as... Figure 1 As shown, the distance from the second end 113 protruding relative to the cell 104 is B, 0.2mm≤A≤1mm.

[0031] exist Figure 1 In the first embodiment shown, the support post 109 is a conductor. For example, the support post 109 can be made of a metallic material, thereby giving it high strength and improving the impact resistance and safety of the secondary battery 101. Preferably, the material of the support post 109 can be tungsten carbide, which has high strength and hardness, making it suitable for supporting the cover 102 and the housing 103 of the secondary battery 101. Furthermore, tungsten carbide is corrosion-resistant, and the support post 109 made of tungsten carbide can still maintain good support even when immersed in electrolyte for a long time. The insulating sheet 106 can prevent the cover 102 and the housing 103 from directly contacting the conductive support post 109, thereby preventing short circuits within the secondary battery 101.

[0032] When the support post 109 is a conductor, if the secondary battery 101 is subjected to an axial impact, the two ends of the support post 109 may pierce the two insulating sheets 106 respectively, and the two ends of the support post 109 will contact and conduct with the cover 102 and the housing 103 respectively. In this way, the support post 109 short-circuits the housing 103 and the cover 102, thereby releasing electrical energy from the secondary battery 101. It should be noted that this short-circuit discharge only involves the housing 103 and the cover 102, and the released energy will be relatively low, not enough to cause the secondary battery 101 to catch fire or explode. However, if there is no support post 109, and a heavy object directly impacts and shatters the housing 103, the cover 102, and the battery cell 104, a large-area short circuit will occur in the battery cell 104, releasing a high amount of energy instantaneously, which could lead to a fire. Therefore, the support post 109 short-circuiting the housing 103 and the cover 102 after the secondary battery 101 is impacted helps to improve the safety of the secondary battery 101.

[0033] The battery cell 104 can be a wound battery cell 104, which is wound around the outside of the support post 109. The support post 109 serves to support the housing 103 and the cover 102 axially and to support the battery cell 104 radially. It should be noted that when the support post 109 is a conductor, the secondary battery 101 may also include an insulating layer 115. Figure 1 (Not shown in the image) An insulating layer 115 covers the outer peripheral surface of the support post 109 and the outer peripheral surface of the main body 116. The insulating layer 115 separates the battery cell 104 from the support post 109 to prevent a short circuit between the support post 109 and the battery cell 104 when the secondary battery 101 is in normal use.

[0034] Figure 2 A secondary battery 101 according to a second embodiment of the present invention is shown. The support column 109 of the secondary battery 101 is made of insulating material. The outer surfaces of the first end 107 and the second end 113 are both insulated. The first end 107 abuts against the first surface 108, and the second end 113 abuts against the second surface 114, thereby supporting the first surface 108 and the second surface 114 at both ends of the support column 109, respectively. The secondary battery 101 of this embodiment does not require an insulating sheet 106, which helps to reduce the cost of the secondary battery 101 and improve the ease of assembly. The support column 109 can be made entirely of insulating material (e.g., plastic), thus making the outer surfaces of the first end 107 and the second end 113 insulated. Alternatively, the surfaces of the first end 107 and the second end 113 are provided with an insulating coating.

[0035] Figure 3 A secondary battery 101 according to a third embodiment of the present invention is shown. For example... Figures 3 to 5As shown, the support column 109 also includes a main body 116. A first end 107 and a second end 113 are respectively connected to the two end faces of the main body 116, and the first end 107, the second end 113, and the main body 116 are all conductors and are interconnected. Both the first end 107 and the second end 113 include at least one piercing portion 117. From the end of the piercing portion 117 near the main body 116 to the end of the piercing portion 117 away from the main body 116, the cross-sectional area of ​​the piercing portion 117 gradually decreases, and the piercing portion 117 is relatively sharp. The end of the piercing portion 117 away from the main body (i.e., the tip of the piercing portion 117) abuts against the first insulating sheet 119 or the second insulating sheet 120. In the secondary battery 101 of the third embodiment, the first end 107 and the second end 113 of the support column 109 are relatively sharp. After the secondary battery 101 is subjected to axial impact, the support column 109 can easily pierce the insulating sheet 106, thereby short-circuiting the cover 102 and the housing 103 to ensure the safety of the secondary battery 101.

[0036] In some embodiments, the secondary battery 101 further includes an elastic element. For example... Figure 6 As shown, in the fourth embodiment, the secondary battery 101 further includes a first elastic member 118 and a second elastic member 121. The first elastic member 118 is sleeved outside the first end portion 107, with one end of the first elastic member 118 abutting against the main body portion 116, and the other end of the first elastic member 118 protruding relative to the end of the first end portion 107 away from the main body portion 116. For example, both ends of the first elastic member 118 abut against the first insulating sheet 119 and the main body portion 116, respectively; that is, the bottom end of the first elastic member 118 abuts against the first insulating sheet 119, and the top end of the first elastic member 118 abuts against the bottom surface of the main body portion 116. The end of the first end portion 107 near the first surface 108 is spaced apart from the first insulating sheet 119. The first elastic member 118 can be a spring or a sleeve made of rubber.

[0037] When the secondary battery 101 is subjected to axial impact, the first elastic element 118 can act as a buffer, reducing the degree of damage to the secondary battery 101. During normal use of the secondary battery 101, the first elastic element 118 contacts the first insulating sheet 119, while the sharp first end 107 does not contact the first insulating sheet 119, making it less likely for the first insulating sheet 119 to be punctured. This reduces the risk of the support column 109 short-circuiting the cover 102 and the housing 103 during normal use of the secondary battery 101. When the secondary battery 101 is subjected to a more severe impact, the first elastic element 118 is compressed to a greater degree, and the piercing portion 117 of the first end 107 contacts the first insulating sheet 119, thereby piercing the first insulating sheet 119.

[0038] Similarly, the second elastic member 121 is sleeved on the outside of the second end portion 113. One end of the second elastic member 121 abuts against the main body portion 116, and the other end of the second elastic member 121 protrudes from the end of the second end portion 113 away from the main body portion 116. The end of the second end portion 113 near the second surface 114 is spaced apart from the second insulating sheet 120. The function of the second elastic member 121 is similar to that of the first elastic member 118. The second elastic member 121 can provide cushioning when the secondary battery 101 is subjected to axial impact, and can reduce the risk that the support column 109 will short-circuit the cover 102 and the housing 103 during normal use of the secondary battery 101.

[0039] In some implementations, when the first end 107 includes a piercing portion 117, the piercing portion 117 is longer in the axial direction of the support post 109 than the thickness of the first insulating sheet 119. This arrangement facilitates the piercing portion 117 piercing the first insulating sheet 119, thereby facilitating the support post 109 to short-circuit the cover 102 and the housing 103. Similarly, when the second end 113 includes a piercing portion 117, the piercing portion 117 is longer in the axial direction of the support post 109 than the thickness of the second insulating sheet 120.

[0040] In some embodiments, the piercing portion 117 has a length of L in the axial direction, where 0.08 mm ≤ L ≤ 0.2 mm. In this configuration, the length of the piercing portion 117 is moderate; it is neither too short to pierce the insulating sheet 106 nor too long to cause the secondary battery 101 to become too large.

[0041] In some embodiments, the thickness of the first insulating sheet 119 is H1, where 0.05mm ≤ H1 ≤ 0.1mm. This setting ensures that the thickness of the first insulating sheet 119 is moderate, allowing it to effectively perform its insulating function without causing the secondary battery 101 to become excessively large due to excessive thickness. Similarly, the thickness of the second insulating sheet 120 is H2, where H2 satisfies: 0.05mm ≤ H2 ≤ 0.1mm.

[0042] In some embodiments, the insulating sheet 106 may be made of a flame-retardant and insulating material, which helps reduce the risk of large-area fires in the secondary battery 101. For example, the insulating sheet 106 may be made of ceramicized silicon, which is insulating and retains elasticity at room temperature, thus cushioning impacts; it can also rapidly transform into a hard ceramic body in high-temperature flames, and this material has good flame retardancy. In other embodiments, the insulating sheet 106 may simply have a flame-retardant material layer on its surface. For example, the main body 116 of the insulating sheet 106 may be made of plastic, and the outer surface of this main body 116 may be covered with a flame-retardant material layer (e.g., a ceramicized silicon material layer).

[0043] It should be noted that in the second embodiment described above, the first end 107 abuts against the first surface 108, and the second end 113 abuts against the second surface 114. This is beneficial to improving the support effect of the support column 109 on the housing 103 and the cover 102. However, in some embodiments not shown, the first end 107 and the first surface 108 may be spaced apart, or the second end 113 and the second surface 114 may be spaced apart. Although there is a gap between the first end 107 and the first surface 108, or between the second end 113 and the second surface 114, after the secondary battery 101 is impacted and the cover 102 or the housing 103 is slightly deformed, the first end 107 and the second end 113 can respectively abut against the housing 103 and the cover 102, thereby supporting the outer shell of the secondary battery 101 and preventing further deformation of the outer shell.

[0044] Similarly, in some other embodiments not shown, when the secondary battery 101 is provided with a first insulating sheet 119 and a second insulating sheet 120, the first insulating sheet 119 and the support post 109 may not be in contact, or the second insulating sheet 120 and the support post 109 may not be in contact (when not subjected to impact). The first insulating sheet 119 may be attached to the first surface 108, and the second insulating sheet 120 may be attached to the second surface 114.

[0045] In the fourth embodiment described above, the first elastic member 118 is sleeved outside the first end 107, and the second elastic member 121 is sleeved outside the second end 113. The first elastic member 118 abuts against the first insulating sheet 119, and the second elastic member 121 abuts against the second insulating sheet 120. However, in some embodiments not shown, the secondary battery 101 may not have the first insulating sheet 119 and the second insulating sheet 120, and both the first elastic member 118 and the second elastic member 121 may be insulators. In this case, when the secondary battery 101 is impacted, the first elastic member 118 will be compressed, and the first end 107 will extend beyond the first elastic member 118 and pierce the first surface 108; and / or, the second elastic member 121 will be compressed, and the second end 113 will extend beyond the second elastic member 121 and pierce the second surface 114. Whether the first side 108 is punctured or the second side 114 is punctured, the chamber 105 will be connected to the external environment. Even if the cell 104 is short-circuited, the high-temperature and high-pressure gas generated by the short circuit can be discharged to the external environment, thereby reducing the risk of the secondary battery 101 exploding.

[0046] The secondary battery 101 in any of the above embodiments can be used in electrical devices, such as watches, car keys, electronic thermometers, toys, etc.

[0047] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "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 utility model. 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.

Claims

1. A secondary battery, characterized in that, include: A housing having a first surface; A cover, connected to the housing, the cover and the housing together defining a chamber, the cover having a second surface facing the chamber, and the first surface and the second surface facing each other; The battery cell is located within the cavity; A support column is located within the cavity. The support column includes a first end and a second end. In the axial direction of the support column, the end of the first end near the first surface protrudes relative to the battery cell, and / or the end of the second end near the second surface protrudes relative to the battery cell.

2. The secondary battery according to claim 1, characterized in that, The support column also includes a main body, with the first end and the second end respectively connected to the two end faces of the main body. The first end and / or the second end includes at least one piercing portion, and the cross-sectional area of ​​the piercing portion gradually decreases from the end of the piercing portion near the main body to the end of the piercing portion away from the main body.

3. The secondary battery according to claim 2, characterized in that, The first end, the second end, and the main body are interconnected, and the outer surfaces of the first end and the second end are conductors. The secondary battery also includes a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is located between the first end and the first surface, and the second insulating sheet is located between the second end and the second surface.

4. The secondary battery according to claim 3, characterized in that, The first end portion includes the puncture portion, and the length of the puncture portion in the axial direction of the support column is greater than the thickness of the first insulating sheet; And / or, the second end includes the puncture portion, the length of which in the axial direction of the support column is greater than the thickness of the first insulating sheet.

5. The secondary battery according to claim 2, characterized in that, The secondary battery also includes a first elastic element, which is sleeved on the outside of the first end. One end of the first elastic element abuts against the main body, and the other end of the first elastic element protrudes from the end of the first end that is away from the main body. And / or, the secondary battery further includes a second elastic member, which is sleeved outside the second end, with one end of the second elastic member abutting against the main body, and the other end of the second elastic member protruding relative to the end of the second end that is away from the main body.

6. The secondary battery according to claim 1, characterized in that, The support column also includes a main body, with the first end and the second end respectively connected to the two end faces of the main body. The battery cell is wound around the outside of the main body. The secondary battery also includes an insulating layer, which covers the outer peripheral surface of the main body and separates the main body from the battery cell.

7. The secondary battery according to claim 1, characterized in that, The distance A from the first end protruding relative to the battery cell is 0.2mm≤A≤1mm; And / or, the distance B from the second end protruding relative to the battery cell is 0.2mm≤B≤1mm.

8. The secondary battery according to claim 1, characterized in that, The outer surfaces of the first end and the second end are both insulated.

9. The secondary battery according to claim 8, characterized in that, The first end abuts against the first surface, and the second end abuts against the second surface.

10. Electrical equipment, characterized in that, Includes the secondary battery as described in any one of claims 1 to 9.

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