Battery and electric device

Abstract

The embodiment of the utility model discloses a battery and an electric device. The battery comprises a shell, a sealing cover and an elastic sealing element, a first wall is arranged on the shell, and a liquid injection hole for injecting liquid into the battery is formed in the first wall; the sealing piece is of a spherical structure and is used for blocking the liquid injection hole; the sealing cover is connected with the shell, and the sealing cover is used for limiting the sealing piece in the first direction. According to the embodiment of the invention, through the arrangement of the sealing element with the spherical structure, the space occupied by the sealing element in the first direction after the sealing element is placed in the liquid injection hole can be reduced, and the conditions of bending, damage and the like of the sealing element in the direction perpendicular to the first direction can be avoided; through the arrangement of the elastic sealing element, the sealing element can be compressed and then plugged into the liquid injection hole, so that the sealing effect of the sealing element on the liquid injection hole is ensured; and the split sealing structure is higher in stability, so that the sealing effect of the whole battery on the liquid injection hole is more stable.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a battery and an electrical device. Background Art

[0002] In the field of lithium-ion batteries, a battery comprises a metal casing, a battery cell, and a cover assembly. The cover assembly, located on top of the metal casing, includes components such as a cover plate, an insulator, and electrode posts. To facilitate battery filling, the cover plate is provided with a liquid injection hole. To ensure the sealing of the cover assembly, the cover plate assembly also includes a battery for sealing the liquid injection hole.

[0003] Currently, most batteries use cylindrical seals to block the liquid injection holes. On the one hand, they occupy the space in the Z direction of the battery cell, and on the other hand, they are prone to bending, resulting in poor sealing. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery and an electrical device that reduce the space occupied by the seal in the axial direction of the liquid injection hole while also improving the stability and reliability of the sealing structure.

[0005] In a first aspect, the present application provides a battery, comprising: a housing, a sealing cover, and an elastic sealing member;

[0006] The housing is provided with a first wall, and the first wall is provided with a liquid injection hole for injecting liquid into the battery;

[0007] The sealing member is a spherical structure and is used to seal the injection hole;

[0008] The sealing cover is connected to the housing, and is used to limit the sealing member in a first direction.

[0009] Based on the above-mentioned battery, by setting a spherical seal, the space occupied by the seal in the first direction of the battery cell can be reduced after being placed in the injection hole, and the seal can be prevented from bending, being damaged, etc. in a direction perpendicular to the first direction; by setting an elastic seal, the seal can be compressed and inserted into the injection hole to achieve an interference fit between the seal and the injection hole, thereby ensuring the sealing effect of the seal on the injection hole; by setting a sealing cover, a split sealing structure that cooperates with the seal can be formed, that is, the sealing cover only needs to limit the seal in the first direction and lock the seal in the injection hole. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, which makes the sealing effect of the entire battery on the injection hole more stable.

[0010] Optionally, the liquid injection hole includes a first opening facing the sealing cover and a second opening opposite to the sealing cover;

[0011] The inner side wall of the liquid injection hole smoothly transitions to the first opening through a first transition surface, and the diameter of the first opening is smaller than the diameter of the sealing member;

[0012] and / or,

[0013] The inner side wall of the liquid injection hole smoothly transitions to the second opening through a second transition surface, and the diameter of the second opening is smaller than the diameter of the sealing member.

[0014] Furthermore, based on the above-mentioned liquid injection hole, the cooperation of the first transition surface and the second transition surface can achieve a limiting effect on the seal. It should be noted that when the seal is located in the liquid injection hole, it can obtain the elastic force applied by the first transition surface toward the second opening, and also obtain the elastic force applied by the second transition surface toward the first opening, so that the seal is always in a compressed state in the liquid injection hole, and then the diameters of the first opening and the second opening are both smaller than the diameter of the seal in the natural state, so that the seal is more stably locked in the liquid injection hole.

[0015] Optionally, the inner side wall of the injection hole smoothly transitions to the first opening through a first transition surface, and the inner side wall of the injection hole smoothly transitions to the second opening through a second transition surface, the diameter of the second opening is smaller than the diameter of the seal, and the diameter of the first opening is smaller than the diameter of the second opening.

[0016] Furthermore, based on the above-mentioned liquid injection hole, the probability of the sealing member falling out from the liquid injection hole can be further reduced.

[0017] Optionally, the first transition surface and / or the second transition surface is an arcuate surface structure that matches the shape of the outer surface of the sealing element.

[0018] Furthermore, based on the above-mentioned first transition surface and second transition surface, the arc surface structure can be used to increase the contact area between the first transition surface and the second transition surface and the seal, thereby improving the support and extrusion effect of the two on the seal. At the same time, the first transition surface and the second transition surface of this arc surface structure can further improve the locking effect on the seal. Since the first transition surface and the second transition surface are closer to the axis of the injection hole, the angle of their tangents to the injection hole is closer to vertical. That is, the closer to the first opening or the second opening, the direction of the extrusion force applied by the first transition surface or the second transition surface to the seal is closer to the axial direction of the injection hole. That is, the ability of the first transition surface and the second transition surface to guide the seal toward the first opening or the second opening can be reduced, and the ability of the first transition surface and the second transition surface to lock the seal between the first opening and the second opening is also improved.

[0019] Optionally, a first set angle a1 is formed between the first transition surface and / or the second transition surface and the first direction, wherein 0°<a1≤45°.

[0020] Furthermore, based on the above-mentioned first set angle a1, the first transition surface and / or the second transition surface can not only stably lock the seal in the liquid injection hole, but also facilitate the insertion and removal of the seal. That is to say, setting the first transition surface and / or the second transition surface to this angle can provide a reliable extrusion effect while also guiding the insertion and removal of the seal.

[0021] Optionally, a height of the first transition surface in the first direction is H1, and a height of the second transition surface in the first direction is H2, wherein 0.5H2≤H1≤1.5H2.

[0022] Furthermore, based on the height ratio of the first transition surface and the second transition surface, the height of the first transition surface can be at least 1 / 3 of the height of the injection hole, or the height of the second transition surface can be at least 1 / 4 of the height of the injection hole, so as to ensure that both the first transition surface and the second transition surface can reliably rub and squeeze with the surface of the seal.

[0023] Optionally, a surface of the sealing cover close to the sealing member is provided with an avoidance groove for avoiding the sealing member.

[0024] Furthermore, based on the above-mentioned avoidance groove, it should be understood that the shape of the avoidance groove can be matched with the outer surface shape of the portion of the seal protruding from the first opening to increase the contact area with the seal and improve the limiting effect of the sealing cover on the seal. By setting the avoidance groove, it is also possible to avoid excessive squeezing force on the seal, which affects the connection reliability between the sealing cover and the cover plate.

[0025] Optionally, at least one stress relief groove is formed on a surface of the sealing cover close to the sealing element along its circumference, and the stress relief groove extends in a radial direction of the sealing cover.

[0026] Furthermore, the larger the overall volume of the sealing cover, the greater its internal stress. The sealing cover itself can be an aluminum nail structure. Based on the above-mentioned stress relief groove, the probability of cracking during welding or bonding of the sealing cover and the seal can be reduced, and part of the internal stress can be released. The stress relief groove can specifically be a strip groove with a cross-sectional shape of a triangle, trapezoid, rectangle, semicircle, etc.

[0027] Optionally, the battery further includes an insulating member, which is located on a side of the housing away from the sealing cover, and a supporting groove is formed on the insulating member for supporting a portion of the sealing member protruding from the second opening.

[0028] Furthermore, based on the above-mentioned insulating part, the bottom of the seal is protected. The outer shell of the support groove, that is, the partial structure of the support groove formed on the insulating part, can prevent the bottom of the seal from being subjected to the extrusion force exerted on it by other structures, thereby further improving the stability of the seal in the injection hole.

[0029] Optionally, a through hole is formed at the center of the support groove for part of the sealing member to pass through, and a protective cover is provided on the side of the insulating member opposite to the injection hole. The protective cover has a protective groove, and the protective cover is buckled on the through hole so that the side wall of the protective groove surrounds the circumference of the sealing member.

[0030] Furthermore, based on the protective cover, the bottom of the seal is protected. The protective cover can reduce the pressure on the bottom of the seal, thereby further improving the stability of the seal in the liquid injection hole.

[0031] In a second aspect, the present application provides an electrical device comprising the battery as described above.

[0032] Furthermore, the above-mentioned electrical device, by using the above-mentioned battery, can not only reduce the size in the first direction, but also avoid the sealing member from bending, being damaged, etc. in a direction perpendicular to the first direction; by setting up an elastic sealing member, the sealing effect of the sealing member on the injection hole is improved; by setting up the sealing cover, a split sealing structure that cooperates with the seal can be formed, that is, the sealing cover only needs to limit the seal in the first direction and lock the seal in the injection hole. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, so that the sealing effect of the entire battery on the injection hole is more stable.

[0033] One or more of the above embodiments of the present application have at least one or more of the following beneficial effects:

[0034] By setting up a sealing member with a spherical structure, the space occupied by the sealing member in the first direction of the battery cell after being placed in the liquid injection hole can be reduced, and the sealing member can be prevented from bending or being damaged in a direction perpendicular to the first direction; by setting up an elastic sealing member, the sealing member can be compressed and inserted into the liquid injection hole to achieve an interference fit between the sealing member and the liquid injection hole, thereby ensuring the sealing effect of the sealing member on the liquid injection hole; by setting up a sealing cover, a split sealing structure that cooperates with the sealing member can be formed, that is, the sealing cover only needs to limit the sealing member in the first direction and lock the sealing member in the liquid injection hole. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, thereby making the sealing effect of the entire battery on the liquid injection hole more stable.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The disclosure of this application will be more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the figures represent similar components, where:

[0037] Figure 1 This is an exploded view of the structure of the battery described in an embodiment of the present application;

[0038] Figure 2 A cross-sectional view of the battery at the liquid injection hole according to an embodiment of the present application;

[0039] Figure 3 A cross-sectional view of the cover plate at the liquid injection hole according to an embodiment of the present application;

[0040] Figure 4 This is a schematic structural diagram of a sealing cover according to one embodiment of the present application;

[0041] Figure 5 This is a schematic structural diagram of a sealing cover according to another embodiment of the present application;

[0042] Figure 6 This is a schematic structural diagram of a sealing cover according to another embodiment of the present application;

[0043] Figure 7 This is a schematic structural diagram of a sealing cover according to another embodiment of the present application;

[0044] Figure 8 This is a schematic structural diagram of a sealing cover according to another embodiment of the present application;

[0045] Figure 9 This is a cross-sectional view of the sealing member described in an embodiment of the present application being fixed in the liquid injection hole.

[0046] Description of Reference Numerals

[0047] 1. Cover plate; 11. Liquid injection hole; 111. First opening; 112. Second opening; 113. First transition surface; 114. Second transition surface; 12. Mounting groove; 2. Sealing cover; 21. Avoidance groove; 22. Stress relief groove; 3. Sealing member; 4. Insulating member; 41. Support groove; 411. Through hole; 42. Protective cover. DETAILED DESCRIPTION

[0048] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application.

[0049] Currently, most batteries use cylindrical seals to block the liquid injection holes. On the one hand, they occupy the space in the Z direction of the battery cell, and on the other hand, they are prone to bending, resulting in poor sealing.

[0050] Based on this, the present application provides a battery, which, through the setting of a spherical seal, can reduce the space occupied by the seal in the first direction of the battery cell after being placed in the injection hole, and can also avoid the seal from bending, damage, etc. in the direction perpendicular to the first direction; through the setting of an elastic seal, the seal can be compressed and inserted into the injection hole to achieve an interference fit between the seal and the injection hole, thereby ensuring the sealing effect of the seal on the injection hole; through the setting of a sealing cover, a split sealing structure that cooperates with the seal can be formed, that is, the sealing cover only needs to limit the seal in the first direction and lock the seal in the injection hole. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, so that the sealing effect of the entire battery on the injection hole is more stable.

[0051] The present application will be described in detail below through specific embodiments.

[0052] Reference Figures 1 to 3As shown, this embodiment provides a battery, comprising: an outer shell, a sealing cover 2 and an elastic sealing member 3; a first wall is provided on the outer shell, and an injection hole 11 for injecting liquid into the interior of the battery is provided on the first wall, wherein the outer shell may specifically include a cover plate 1, and the injection hole 11 may be provided on the cover plate 1, and the injection hole 11 may also be provided on other positions such as the pole, as long as it can connect to the interior of the battery and complete the injection of liquid into the interior of the battery; the sealing member 3 is a spherical structure and is used to block the injection hole 11; the sealing cover 2 is connected to the outer shell, and the sealing cover 2 is used to limit the sealing member 3 in a first direction, and specifically the sealing cover 2 may be connected to the surface of the cover plate 1 facing the outside of the battery to limit the sealing member 3 to prevent the sealing member 3 from falling out of the battery.

[0053] The battery provided in this embodiment can reduce the space occupied by the seal 3 in the first direction of the battery cell after being placed in the injection hole 11 by the provision of the spherical structure seal 3, and can also avoid the seal 3 from bending, damage, etc. in a direction perpendicular to the first direction; by providing the elastic seal 3, the seal 3 can be compressed and inserted into the injection hole 11 to achieve an interference fit between the seal 3 and the injection hole 11, thereby ensuring the sealing effect of the seal 3 on the injection hole 11; by providing the sealing cover 2, a split sealing structure that cooperates with the seal 3 can be formed, that is, the sealing cover 2 only needs to limit the seal 3 in the first direction and lock the seal 3 in the injection hole 11. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, so that the sealing effect of the entire battery on the injection hole 11 is more stable.

[0054] In some embodiments, the injection hole 11 includes a first opening 111 facing the sealing cover 2 and a second opening 112 opposite to the sealing cover 2, wherein the seal 3 can be inserted into the injection hole 11 from the first opening 111 after being squeezed, and will not completely pass through the second opening 112. Through the elasticity of the seal 3 itself, it is squeezed on the inner wall of the injection hole 11 and then fixed in the injection hole 11 to achieve the blocking of the injection hole 11; the inner side wall of the injection hole 11 smoothly transitions to the first opening 111 through the first transition surface 113, and the diameter of the first opening 111 is smaller than the diameter of the seal 3; and / or, the inner side wall of the injection hole 11 smoothly transitions to the second opening 112 through the second transition surface 114, and the diameter of the second opening 112 is smaller than the diameter of the seal 3. It should be understood that the first transition surface 113 can match the outer surface of the partially conical structure that is roughly fan-shaped after expansion. The inclined surface structure of the first transition surface 113 gradually narrows the middle part of the injection hole 11 in the direction toward the first opening 111, and the second transition surface 114 can also be an inclined surface structure that matches the outer surface of the partial conical structure that is roughly in the shape of a fan ring after expansion. The entire second transition surface 114 gradually narrows the middle part of the injection hole 11 in the direction toward the second opening 112; specifically, the first transition surface 113 and / or the second transition surface 114 can be an inclined surface structure that matches the outer surface of a portion of a cone, or an inclined surface structure that matches the outer surface of a portion of a pyramid. At the same time, in the axial direction of the injection hole 11, the slope of the first transition surface 113 and / or the second transition surface 114 can remain unchanged or change gradually. That is, the first transition surface 113 and / or the second transition surface 114 can be either a straight line or a curved line in the cross section passing through the axis of the injection hole 11.

[0055] Furthermore, based on the above-mentioned liquid injection hole 11, the cooperation between the first transition surface 113 and the second transition surface 114 can achieve a limiting effect on the seal 3. It should be noted that when the seal 3 is located in the liquid injection hole 11, it can obtain the elastic force applied by the first transition surface 113 toward the second opening 112, and can also obtain the elastic force applied by the second transition surface 114 toward the first opening 111, so that the seal 3 is always in a compressed state in the liquid injection hole 11, and then the diameters of the first opening 111 and the second opening 112 are both smaller than the diameter of the seal 3 in the natural state, so that the seal 3 is more stably locked in the liquid injection hole 11.

[0056] Optionally, the inner wall of the injection hole 11 smoothly transitions to the first opening 111 through a first transition surface 113, and the inner wall of the injection hole 11 smoothly transitions to the second opening 112 through a second transition surface 114, the diameter of the second opening 112 is smaller than the diameter of the seal 3, and the diameter of the first opening 111 is smaller than the diameter of the second opening 112; it should be noted that the first transition surface 113 and the second transition surface 114 can be directly connected, at this time, the inner wall of the injection hole 11 is completely covered by the first transition surface 113 and the second transition surface 114.

[0057] Furthermore, based on the above-mentioned liquid injection hole 11 , the probability of the sealing member 3 falling out from the liquid injection hole 11 can be further reduced.

[0058] Optionally, the first transition surface 113 and / or the second transition surface 114 is an arc-shaped surface structure that matches the outer surface shape of the seal 3; that is, the first transition surface 113 and the second transition surface 114 can together surround a spherical space to accommodate the seal 3, and the size of the space is smaller than the size of the seal 3 in its natural state, so as to ensure that the first transition surface 113 and the second transition surface 114 can always provide a clamping force to the seal 3, thereby improving the sealing effect.

[0059] Furthermore, based on the above-mentioned first transition surface 113 and second transition surface 114, the arcuate surface structure can be used to increase the contact area between the first transition surface 113 and the second transition surface 114 and the seal 3, thereby improving the support and extrusion effect of the two on the seal 3. At the same time, the first transition surface 113 and the second transition surface 114 of the arcuate surface structure can further improve the locking effect on the seal 3. Since the first transition surface 113 and the second transition surface 114 are closer to the axis of the injection hole 11, the angle between their tangents and the injection hole 11 is closer to the vertical. That is to say, the closer to the first opening 111 or the second opening 112, the closer the direction of the extrusion force applied by the first transition surface 113 or the second transition surface 114 to the seal 3 is to the axial direction of the liquid injection hole 11, that is, the ability of the first transition surface 113 and the second transition surface 114 to guide the seal 3 to the first opening 111 or the second opening 112 can be reduced, and the ability of the first transition surface 113 and the second transition surface 114 to lock the seal 3 between the first opening 111 and the second opening 112 can also be improved.

[0060] Optionally, a first set angle a1 is formed between the first transition surface 113 and / or the second transition surface 114 and the first direction, wherein 0°<a1≤45°.

[0061] Furthermore, based on the above-mentioned first set angle a1, the first transition surface 113 and / or the second transition surface 114 can not only stably lock the seal 3 in the liquid injection hole 11, but also facilitate the insertion and removal of the seal 3. That is to say, setting the first transition surface 113 and / or the second transition surface 114 to this angle can provide a reliable extrusion effect while also guiding the insertion and removal of the seal 3.

[0062] Optionally, a height of the first transition surface 113 in the first direction is H1, and a height of the second transition surface 114 in the first direction is H2, wherein 0.5H2≤H1≤1.5H2.

[0063] Furthermore, based on the height ratio of the first transition surface 113 and the second transition surface 114, the height of the first transition surface 113 can be at least 1 / 3 of the height of the injection hole 11, or the height of the second transition surface 114 can be at least 1 / 4 of the height of the injection hole 11, so as to ensure that both the first transition surface 113 and the second transition surface 114 can reliably rub and squeeze with the surface of the seal 3.

[0064] Optionally, the cover plate 1 is provided with a mounting groove 12 that matches the sealing cover 2 , the sealing cover 2 is arranged in the mounting groove 12 , and the outer surface of the sealing cover 2 is flush with the outer surface of the cover plate 1 .

[0065] Furthermore, based on the above-mentioned mounting groove 12, it is possible to provide accommodation space for the sealing cover 2, further reducing the size of the entire battery in the first direction. At the same time, the peripheral side walls of the mounting groove 12 can also be limited and fixed with the peripheral sides of the sealing cover 2, thereby increasing the contact area between the sealing cover 2 and the cover plate 1, making the relative position of the two more stable, and also enhancing the connection effect between the cover plate 1 and the sealing cover 2.

[0066] Continue to refer to Figures 4 to 8 As shown, a surface of the sealing cover 2 close to the sealing member 3 is provided with an avoidance groove 21 for avoiding the sealing member 3 .

[0067] Furthermore, based on the above-mentioned avoidance groove 21, it should be understood that the shape of the avoidance groove 21 can be matched with the outer surface shape of the portion of the seal 3 protruding from the first opening 111 to increase the contact area with the seal 3 and improve the limiting effect of the sealing cover 2 on the seal 3. By setting the avoidance groove 21, it is also possible to avoid excessive squeezing force on the seal 3, which may affect the connection reliability between the sealing cover 2 and the cover plate 1.

[0068] Continue to refer to Figures 6 to 8As shown, the circumferential side of the avoidance groove 21 has a first guide surface, and the circumferential side of the sealing cover 2 has a second guide surface that cooperates with the first guide surface. When the sealing cover 2 is placed in the avoidance groove 21, the sealing cover 2 can automatically fall to the set position through the sliding cooperation of the first guide surface and the second guide surface.

[0069] Optionally, at least one stress relief groove 22 is formed on the surface of the sealing cover 2 close to the sealing member 3 along its circumference, and the stress relief groove 22 extends along the radial direction of the sealing cover 2 .

[0070] Furthermore, the larger the overall volume of the sealing cover 2, the greater its internal stress. The sealing cover 2 itself can be an aluminum nail structure. Based on the above-mentioned stress relief groove 22, the probability of cracking during welding or bonding of the sealing cover 2 and the seal 3 can be reduced, and part of the internal stress can be released. The stress relief groove 22 can specifically be a strip groove with a cross-sectional shape of a triangle, trapezoid, rectangle, semicircle, etc.

[0071] Continue to refer to Figure 6 As shown, there can be two stress relief grooves 22, and the two stress relief grooves 22 are in opposite groove-shaped structures. The two stress relief grooves 22 are located on the same diameter line of the sealing cover 2. Figure 7 and Figure 8 As shown, there may be multiple stress relief grooves 22 , and the multiple stress relief grooves 22 may be evenly arranged along the circumference of the sealing cover 2 .

[0072] Continue to refer to Figure 1 and Figure 2 As shown, the battery further includes an insulating member 4, which is located on the side of the housing away from the sealing cover 2, wherein the insulating member 4 can be specifically arranged on the side of the cover plate 1 away from the sealing cover 2, and a supporting groove 41 is provided on the insulating member 4 for accommodating a portion of the sealing member 3 protruding from the second opening 112.

[0073] Furthermore, based on the above-mentioned insulating part 4, protection of the bottom of the sealing part 3 is achieved. The outer shell of the support groove 41, that is, the partial structure of the support groove 41 formed on the insulating part 4, can prevent the bottom of the sealing part 3 from being subjected to the extrusion force exerted on it by other structures, thereby further improving the stability of the sealing part 3 in the liquid injection hole 11.

[0074] Continue to refer to Figure 9As shown, the depth of the avoidance groove 21 is H5, the distance between the second opening 112 and the upper surface of the insulating member 4 is H3, and the thickness of the insulating member 4 is H4. Further, when the depth of the support groove 41 is the same as the thickness of the insulating member 4, and the bottom of the seal 3 is completely fitted with the bottom of the support groove 41, and the top of the seal 3 is fitted with the bottom of the avoidance groove 21, at this time, the diameter D of the seal 3 is D=H1+H2+H3+H4+H5. In some embodiments, the bottom of the seal 3 may exceed the bottom of the support groove 41, and the height of the seal 3 exceeding the bottom of the support groove 41 is H6. At this time, the diameter D of the seal 3 is D=H1+H2+H3+H4+H5+H6.

[0075] Optionally, a through hole 411 is formed at the center of the support groove 41 for part of the sealing member 3 to pass through, and a protective cover 42 is provided on the side of the insulating member 4 opposite to the injection hole 11. The protective cover 42 has a protective groove, and the protective cover 42 is buckled on the through hole 411 so that the side wall of the protective groove surrounds the peripheral side of the sealing member 3.

[0076] Furthermore, based on the protective cover 42 , the bottom of the seal 3 is protected. The protective cover 42 can reduce the pressure on the bottom of the seal 3 , thereby further improving the stability of the seal 3 in the injection hole 11 .

[0077] In a second aspect, the present application provides an electrical device comprising the battery as described above.

[0078] Furthermore, based on the above-mentioned electrical device, by using the above-mentioned battery, not only the size in the first direction can be reduced, but also the sealing member 3 can be prevented from bending, being damaged, etc. in a direction perpendicular to the first direction; by setting the elastic sealing member 3, the sealing effect of the sealing member 3 on the liquid injection hole 11 is improved; by setting the sealing cover 2, a split sealing structure that cooperates with the sealing member 3 can be formed, that is, the sealing cover 2 only needs to limit the sealing member 3 in the first direction and lock the sealing member 3 in the liquid injection hole 11. There is no internal stress perpendicular to the first direction between the two, and the split sealing structure is more stable, so that the sealing effect of the entire battery on the liquid injection hole 11 is more stable.

[0079] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations 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 any one or more embodiments or examples.

[0080] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery, characterized in that: include: A housing, a sealing cover (2) and an elastic sealing member (3); The shell is provided with a first wall, and the first wall is provided with a liquid injection hole (11) for injecting liquid into the battery; The sealing member (3) is a spherical structure and is used to seal the liquid injection hole (11); The sealing cover (2) is connected to the housing, and the sealing cover (2) is used to limit the sealing member (3) in a first direction.

2. The battery according to claim 1, characterized in that The liquid injection hole (11) comprises a first opening (111) facing the sealing cover (2) and a second opening (112) facing away from the sealing cover (2); The inner side wall of the liquid injection hole (11) smoothly transitions to the first opening (111) via a first transition surface (113), and the diameter of the first opening (111) is smaller than the diameter of the sealing element (3); and / or, The inner side wall of the liquid injection hole (11) smoothly transitions to the second opening (112) via a second transition surface (114), and the diameter of the second opening (112) is smaller than the diameter of the sealing element (3).

3. The battery according to claim 2, characterized in that The inner side wall of the liquid injection hole (11) smoothly transitions to the first opening (111) via a first transition surface (113), and the inner side wall of the liquid injection hole (11) smoothly transitions to the second opening (112) via a second transition surface (114); the diameter of the second opening (112) is smaller than the diameter of the sealing element (3), and the diameter of the first opening (111) is smaller than the diameter of the second opening (112).

4. The battery according to claim 3, characterized in that The first transition surface (113) and / or the second transition surface (114) are arcuate surface structures that match the shape of the outer surface of the sealing element (3).

5. The battery according to claim 2, characterized in that The first transition surface (113) and / or the second transition surface (114) form a first set angle a1 with the first direction, wherein 0°<a1≤45°.

6. The battery according to claim 2, characterized in that The height of the first transition surface (113) in the first direction is H1, and the height of the second transition surface (114) in the first direction is H2, wherein 0.5H2≤H1≤1.5H2.

7. The battery according to claim 2, characterized in that A relief groove (21) for avoiding the sealing member (3) is provided on the surface of the sealing cover (2) close to the sealing member (3).

8. The battery according to claim 7, characterized in that At least one stress relief groove (22) is provided on the surface of the sealing cover (2) close to the sealing member (3) along its circumference, and the stress relief groove (22) extends along the radial direction of the sealing cover (2).

9. The battery according to claim 2, characterized in that The battery further comprises an insulating member (4), the insulating member (4) being located on a side of the housing away from the sealing cover (2), and the insulating member (4) being provided with a supporting groove (41) for supporting the portion of the sealing member (3) protruding from the second opening (112).

10. The battery according to claim 9, characterized in that A through hole (411) is formed at the center of the support groove (41) for a portion of the sealing member (3) to pass through. A protective cover (42) is provided on the side of the insulating member (4) opposite to the injection hole (11). The protective cover (42) has a protective groove. The protective cover (42) is buckled and placed on the through hole (411) so that the side wall of the protective groove surrounds the circumference of the sealing member (3).

11. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 10.

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