Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment, and relates to the technical field of batteries, and the battery comprises a shell, an electrode assembly, a collector plate, a cover plate and a sealing nail. The electrode assembly is contained in the shell, the current collecting disc is arranged at the end, facing the opening, of the electrode assembly and electrically connected with the electrode assembly, the sealing nail is arranged in the concave portion of the first surface of the cover plate and seals a liquid injection hole in the bottom wall of the concave portion, and in the thickness direction of the cover plate, the sealing nail does not protrude out of the surface where the concave portion is located on the cover plate. The first welding mark connects the sealing nail with the bottom wall of the recess through penetration welding, and the ratio of the inner diameter of the recess to the diameter of the cover plate is greater than or equal to 0.2 and less than or equal to 0.3. According to the battery provided by the invention, the heat dissipation effect can be improved while the sealing performance can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery and an electronic device. Background Art

[0002] Due to the mature production equipment and process, high automation degree, high production efficiency, low cost, strong reliability and good consistency of batteries, they have been widely used in the electric vehicle market.

[0003] In related technologies, since there is a liquid injection hole on the end cover for injecting liquid into the electrode assembly inside the housing, during the assembly process of the battery, by setting a groove on the cover plate, the area outside the groove on the cover plate is used to contact with the heat dissipation device for heat dissipation, the sealing nail is arranged in the groove, and the seam between the edge of the sealing nail and the side wall of the groove is welded by seam welding to achieve the effect of sealing the liquid injection hole.

[0004] However, in the above related technologies, due to the need to ensure the contact area between the cover plate and the heat dissipation device, the size of the groove itself is small, it is difficult to make a matching structure with the sealing nail, and the matching gap between the groove and the sealing nail is large, resulting in problems such as difficult positioning and poor welding quality. Utility Model Content

[0005] Embodiments of the present application provide a battery and an electronic device, which are used to solve the technical problems in the above related technologies that due to the need to ensure the contact area between the cover plate and the heat dissipation device, the size of the groove itself is small, it is difficult to make a matching structure with the sealing nail, and the matching gap between the groove and the sealing nail is large, resulting in problems such as difficult positioning and poor welding quality.

[0006] To achieve the above object, embodiments of the present application provide the following technical solutions:

[0007] A first aspect of embodiments of the present application provides a battery, which includes:

[0008] A housing, including an opening;

[0009] An electrode assembly, accommodated in the housing;

[0010] A current collector plate, arranged at one end of the electrode assembly facing the opening and electrically connected to the electrode assembly;

[0011] A cover plate, covering the opening, the cover plate includes a first surface facing away from the electrode assembly and a second surface facing the electrode assembly, a depression is provided on the first surface, and a liquid injection hole is opened on the bottom wall of the depression;

[0012] A sealing nail, arranged in the depression, and the sealing nail is used to seal the liquid injection hole;

[0013] In the thickness direction of the cover plate, the top of the sealing nail facing away from the second surface does not protrude from the recess;

[0014] The surface of the sealing nail facing away from the cover plate has a first welding mark, the outer edge of the sealing nail surrounds the first welding mark, and the first welding mark penetrates through the sealing nail to reach the inside of the bottom wall of the recess;

[0015] The ratio of the diameter of the recess to the diameter of the cover plate is greater than or equal to 0.2 and less than or equal to 0.3.

[0016] Based on the above technical solution, the present application can also be improved as follows.

[0017] In a possible implementation manner, the bottom wall of the recess has a second welding mark, and the second welding mark penetrates through the bottom wall of the recess to reach the inside of the current collector plate.

[0018] In a possible implementation manner, the recess includes:

[0019] A first groove;

[0020] A second groove, the second groove is arranged in a partial area of the bottom wall of the first groove, and a liquid injection hole is arranged in a partial area of the bottom wall of the second groove;

[0021] The bottom wall of the second groove has the second welding mark;

[0022] The sealing nail is arranged in the second groove, and the first welding mark is used to penetrate and weld the sealing nail to the bottom wall of the second groove;

[0023] In the radial direction of the cover plate, the first welding mark surrounds and encloses the second welding mark, and the first welding mark and the second welding mark are arranged at intervals in the radial direction of the second groove.

[0024] In a possible implementation manner, the difference between the inner diameter of the first groove and the diameter of the sealing nail is greater than or equal to 0 and less than or equal to 4 mm.

[0025] In a possible implementation manner, the recess includes:

[0026] A first groove;

[0027] A second groove, the second groove is arranged in a partial area of the bottom wall of the first groove, and a liquid injection hole is arranged in a partial area of the bottom wall of the second groove;

[0028] The bottom wall of the second groove has the second welding mark;

[0029] The sealing nail is disposed in the first groove, and the first welding mark is used to penetrate and weld the sealing nail to the bottom wall of the first groove;

[0030] In the thickness direction of the cover plate, the first welding mark does not protrude from the surface where the notch of the first groove is located.

[0031] In a possible implementation, one side of the sealing nail facing the liquid injection hole has a guiding structure that cooperates with the side wall of the second groove, and the guiding structure is used to guide the installation of the sealing nail into the first groove;

[0032] And / or, the guiding structure is spaced from the bottom wall of the second groove;

[0033] And / or, the spacing distance between the guiding structure and the bottom wall of the second groove is greater than or equal to 0.01 mm and less than or equal to 0.4 mm.

[0034] In a possible implementation, the depression is the first groove;

[0035] The bottom wall of the first groove is provided with the liquid injection hole, and the sealing nail is disposed in the first groove;

[0036] The sealing nail includes an annular welding portion and a protruding portion, the annular welding portion is connected to the outer edge of the protruding portion, the first welding mark is located at the annular welding portion, and the protruding portion protrudes relative to the welding portion away from the bottom wall of the first groove;

[0037] The ratio of the width of the welding portion in its radial direction to the inner diameter of the first groove is greater than or equal to 0.1 and less than or equal to 0.2.

[0038] In a possible implementation, the battery further includes a sealing plug;

[0039] The sealing plug is disposed in the liquid injection hole, and the sealing plug is used to seal the liquid injection hole.

[0040] In a possible implementation, there is a first gap between the surface of the sealing nail facing the liquid injection hole and the surface of the sealing plug facing the sealing nail;

[0041] And / or, the first gap is greater than or equal to 0.01 mm and less than or equal to 0.4 mm.

[0042] In a possible implementation, the depression is the first groove, and the bottom wall of the first groove has a second welding mark, and the second welding mark is used to penetrate and weld the cover plate to the current collector plate;

[0043] One side of the sealing nail facing the liquid injection hole has a third groove, and there is a second interval between the bottom wall of the third groove and the bottom wall of the first groove;

[0044] The second welding mark is located within the second interval;

[0045] Moreover, the second interval is greater than or equal to 0.05 mm and less than or equal to 2 mm;

[0046] The ratio of the inner diameter of the third groove to the diameter of the sealing nail is greater than or equal to 0.1 and less than or equal to 0.3.

[0047] In a possible implementation, the thickness of the sealing nail is less than the thickness of the cover plate;

[0048] And / or, the thickness of the sealing nail is greater than or equal to 0.08 mm and less than or equal to 0.6 mm.

[0049] In a possible implementation, the material of the cover plate is steel.

[0050] The second aspect of the embodiments of the present application provides an electronic device, which includes the battery as described above.

[0051] The embodiments of the present application provide a battery and an electronic device. The battery is provided with a depression on one side in the thickness direction of the cover plate, and a liquid injection hole is opened on the bottom wall of the depression. The sealing nail is arranged in the depression, and the sealing nail is used to seal the liquid injection hole. The surface of the sealing nail facing away from the cover plate has a first welding mark, and the first welding mark connects the sealing nail and the bottom wall of the depression through penetration welding. Thus, it can be realized that the sealing nail is connected to the cover plate by penetration welding. In this connection method, it does not depend on the stable cooperation between the sealing nail and the side wall of the depression, and there is no need to maintain a very small cooperation gap between the two, so that a stable welding connection can be completed without setting precise guiding and matching structures between the sealing nail and the depression, improving the sealing performance of the liquid injection hole.

[0052] Furthermore, in the thickness direction of the cover plate, by making the sealing nail not protrude from the surface of the depression on the cover plate, the sealing nail can be completely located within the depression, avoiding the problem that when the sealing nail protrudes from the surface, it affects the direct contact between other areas of the cover plate except the depression and the heat dissipation device, and reducing the influence of the sealing nail on the heat dissipation of the cover plate.

[0053] In addition, by making the ratio of the inner diameter of the depression to the diameter of the cover plate greater than or equal to 0.2 and less than or equal to 0.3, a certain space can be provided for the welding between the sealing nail and the bottom wall of the depression, and the problem that the area of the cover plate used for direct contact with the heat dissipation structure is too small due to the too large size of the depression can be avoided, thereby improving the heat dissipation effect of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0055] Figure 1 Structural schematic diagram of a battery provided by an embodiment of the present application;

[0056] Figure 2 For Figure 1 The first partial structural schematic diagram at position A in

[0057] Figure 3 For Figure 1 The second partial structural schematic diagram at position A in

[0058] Figure 4 For Figure 1 The third partial structural schematic diagram at position A in

[0059] Figure 5 For Figure 1 The fourth partial structural schematic diagram at position A in

[0060] Figure 6 Structural schematic diagram of an electronic device provided by an embodiment of the present application.

[0061] Explanation of reference numerals:

[0062] 1. Electronic device; 11 - Working part; 10 - Battery; 20 - Housing; 30 - Electrode assembly; 40 - Current collector plate; 50 - Battery pack;

[0063] 100 - Cover plate;

[0064] 110 - Depression; 120 - Liquid injection hole; 130 - First welding mark; 140 - Second welding mark; 150 - First surface; 160 - Second surface;

[0065] 111 - First groove; 112 - Second groove;

[0066] 200 - Sealing nail;

[0067] 210 - Guide structure; 220 - Annular welding part; 230 - First interval; 240 - Third groove;

[0068] 250 - Second interval;

[0069] 300 - Sealing plug. Detailed implementation manners

[0070] As described in the background art, in the prior art, in order to ensure the contact area between the cover plate and the heat dissipation device, the size of the groove itself is small, making it difficult to fabricate a mating structure with the sealing nail. The mating gap between the groove and the sealing nail is large, resulting in problems such as difficult positioning and poor welding quality.

[0071] The reason for this problem is that the cover plate in the prior art is made of a metal material. For example, the cover plate is a steel cover plate, and the groove is generally formed by stamping. Since metal has a certain fluidity, after the stamping process of the steel cover plate is completed, the connection between the side wall of the groove and the surface of the cover plate is a rounded corner, and the radian of this rounded corner will increase as the diameter of the groove decreases. This will result in a large gap between the outer edge of the sealing nail and the groove. When seam welding is used for welding, due to the large gap, the amount of metal melted near the rounded corner on the cover plate is less, which is not conducive to the welding connection between the sealing nail and the side wall of the groove, and further leads to a low connection strength between the sealing nail and the cover plate, affecting the sealing performance of the battery.

[0072] On the other hand, based on the above content, in order to reduce the radian of the rounded corner to ensure the connection strength of the welding between the sealing nail and the cover plate, it is necessary to enlarge the size of the groove, which will reduce the area of the cover plate for contacting the heat dissipation device, thus affecting the heat transfer effect at the cover plate, and further affecting the heat dissipation effect of the end cover and the battery.

[0073] In view of the above technical problems, an embodiment of the present application provides a battery and a cell. In this battery, a recess is provided on one side of the cover plate in the thickness direction, and a liquid injection hole is opened on the bottom wall of the recess. The sealing nail is disposed in the recess, and the sealing nail is used to seal the liquid injection hole. The surface of the sealing nail facing away from the cover plate has a first welding mark, and the first welding mark connects the sealing nail and the bottom wall of the recess through penetration welding. Thus, the sealing nail can be connected to the cover plate by penetration welding. In this connection method, it does not rely on a stable fit between the sealing nail and the side wall of the recess, and there is no need to maintain a very small fit gap between the two, so that a stable welding connection can be completed without setting a precise guiding and mating structure between the sealing nail and the recess, improving the sealing performance of the liquid injection hole.

[0074] Furthermore, in the thickness direction of the cover plate, by making the sealing nail not protrude from the surface where the recess on the cover plate is located, the sealing nail can be completely located in the recess, avoiding the problem that when the sealing nail protrudes from this surface, it affects the direct contact between other areas of the cover plate except the recess and the heat dissipation device, and reducing the influence of the sealing nail on the heat dissipation of the cover plate.

[0075] In addition, by making the ratio of the inner diameter of the recess to the diameter of the cover plate greater than or equal to 0.2 and less than or equal to 0.3, a certain space can be provided for the welding between the sealing nail and the bottom wall of the recess, and the problem that the area of the cover plate in direct contact with the heat dissipation structure is too small due to the too large size of the recess can be avoided, thereby improving the heat dissipation effect of the battery.

[0076] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0077] Refer to Figure 1 and Figure 2 Embodiment of the present application provides a battery 10, which may include a housing 20, an electrode assembly 30, a current collector plate 40, a cover plate 100, and a sealing nail 200.

[0078] The housing 20 has an opening, the electrode assembly 30 is accommodated in the housing 20, and the current collector plate 40 is disposed at one end of the electrode assembly 30 facing the opening and is electrically connected to the electrode assembly 30.

[0079] The cover plate 100 can cover one end opening of the battery housing 20. The cover plate 100 includes a first surface 150 facing away from the electrode assembly 30 and a second surface 160 facing the electrode assembly 30.

[0080] The first surface 150 is provided with a recess 110. When the cover plate 100 is assembled with the housing 20, the recess 110 can face the outside of the housing 20, and a liquid injection hole 120 is opened on the bottom wall of the recess 110. In some embodiments, the edge contour of the recess 110 may be approximately circular, and the liquid injection hole 120 can be disposed on the bottom wall of the recess 110 and the liquid injection hole 120 and the recess 110 can be coaxially disposed.

[0081] The sealing nail 200 is disposed in the recess 110, and the sealing nail 200 is used to seal the liquid injection hole 120. In some embodiments, the cover plate 100, the housing 20, and the sealing nail 200 may be made of the same metal part. For example, the cover plate 100, the housing 20, and the sealing nail 200 may all be made of a steel structure. The surface of the sealing nail 200 facing away from the cover plate 100 has a first weld mark 130, and the first weld mark 130 connects the sealing nail 200 and the bottom wall of the recess 110 through penetration welding. The penetration welding process is laser penetration welding, that is, the sealing nail 200 is welded to the cover plate 100 through the laser penetration welding process on the surface of the sealing nail 200 facing away from the liquid injection hole 120.

[0082] An embodiment of the present application provides a battery 10. A recess 110 is provided on one side of the cover plate 100 in the thickness direction. A liquid injection hole 120 is formed in the bottom wall of the recess 110. The sealing nail 200 is disposed in the recess 110, and the sealing nail 200 is used to seal the liquid injection hole 120. The surface of the sealing nail 200 facing away from the cover plate 100 has a first welding mark 130. The first welding mark 130 connects the sealing nail 200 and the bottom wall of the recess 110 through penetration welding, so that the sealing nail 200 can be connected to the cover plate 100 by penetration welding. In this connection method, it does not depend on the stable fit between the sealing nail 200 and the side wall of the recess 110, and there is no need to maintain a very small fit gap between the two, so that a stable welding connection can be completed without setting an accurate guiding and fitting structure between the sealing nail 200 and the recess 110, improving the sealing performance of the liquid injection hole and the sealing performance and use stability of the battery 10.

[0083] In some embodiments, in the thickness direction of the cover plate 100, the sealing nail 200 after being welded to the cover plate 100 does not protrude from the surface of the cover plate 100 where the recess 110 is located. In some embodiments, the distance from the surface of the sealing nail 200 facing away from the liquid injection hole 120 to the surface of the cover plate 100 where the recess 110 is located can be less than or equal to 2 mm.

[0084] In this way, in the thickness direction of the cover plate 100, by making the sealing nail 200 not protrude from the surface of the cover plate 100 where the recess 110 is located, the sealing nail 200 can be completely located in the recess 110, avoiding the problem that when the sealing nail 200 protrudes from this surface, it affects the direct contact between other areas of the cover plate 100 except the recess 110 and the heat dissipation device, and reducing the influence of the sealing nail 200 on the heat dissipation of the cover plate 100.

[0085] In specific implementation, the inner diameter of the recess 110 (as Figure 2 shown by D1 in Figure 1 is greater than or equal to 0.2 and less than or equal to 0.3 compared with the diameter of the cover plate 100 (as shown by D2 in ). For example, the ratio of the inner diameter of the recess 110 to the diameter of the cover plate 100 can be 0.21, 0.22, 0.24, 0.26 or 0.28.

[0086] In this way, by making the ratio of the inner diameter of the recess 110 to the diameter of the cover plate 100 greater than or equal to 0.2 and less than or equal to 0.3, a certain space can be provided for the welding between the sealing nail 200 and the bottom wall of the recess 110, and the problem that the area of the cover plate 100 used for direct contact with the heat dissipation structure is too small due to the too large size of the recess 110 can be avoided, thereby improving the heat dissipation effect of the battery 10.

[0087] Refer to Figure 2, in some embodiments, the bottom wall of the recess 110 has a second welding mark 140, and the second welding mark 140 penetrates through the bottom wall of the recess 110 to reach the inside of the current collector plate 40.

[0088] In this way, by using the penetration welding process to weld the bottom wall of the recess 110 to the current collector plate 40, it can be ensured that the second welding mark 140 completely penetrates through the bottom wall of the recess 110 and is welded to the current collector plate 40, which is beneficial to improving the connection strength between the cover plate 100 and the current collector plate 40.

[0089] Reference Figure 2 , in some embodiments, the recess 110 may include a first groove 111 and a second groove 112.

[0090] The edge profile of the first groove 111 may be approximately circular, and the ratio of the inner diameter of the first groove 111 (as shown by D1 in Figure 2 ) to the diameter of the cover plate 100 (as shown by D2 in Figure 1 ) can be greater than or equal to 0.2 and less than or equal to 0.3.

[0091] The second groove 112 is disposed within the first groove 111, and the second groove 112 may also be approximately circular. The second groove 112 is disposed in a partial area of the bottom wall of the first groove 111, the second groove 112 extends back from the notch of the first groove 111, and a liquid injection hole 120 is provided in a partial area of the bottom wall of the second groove 112. The first groove 111, the second groove 112, and the liquid injection hole 120 may be coaxially disposed.

[0092] The bottom wall of the second groove 112 has a second welding mark 140, so that the bottom wall of the second groove 112 is connected to the current collector plate 40 through penetration welding by the second welding mark 140.

[0093] The sealing nail 200 is disposed within the second groove 112, and the first welding mark 130 is used to connect the sealing nail 200 to the bottom wall of the second groove 112 through penetration welding.

[0094] In some embodiments, in the thickness direction of the cover plate 100, the sealing nail 200 can be completely located within the second groove 112, or a part of the sealing nail 200 is located within the second groove 112, and the other part of the sealing nail 200 and the first welding mark 130 on the sealing nail 200 can both be located within the first groove 111, and the sum of the thicknesses of the sealing nail 200 and the first welding mark 130 is not higher than the notch of the first groove 111.

[0095] In specific implementation, in the radial direction of the cover plate 100, in the radial direction of the cover plate 100, the first welding mark 130 surrounds and encloses the second welding mark 140, and the first welding mark 130 and the second welding mark 140 are spaced apart in the radial direction of the second groove 112.

[0096] In this way, the first welding mark 130 and the second welding mark 140 can be offset from each other in the radial direction of the cover plate 100, so as to avoid the influence of the second welding mark 140 on the first welding mark 130, and further avoid the influence of the penetration welding connection between the cover plate 100 and the current collector plate 40 on the penetration welding connection between the sealing nail 200 and the cover plate 100, thereby improving the layout rationality among the various structural components of the cover plate 100.

[0097] Furthermore, since the current collector plate 40 is disposed relatively close to the central axis in the axial direction of the battery 10, by disposing the first welding mark 130 closer to the outer edge of the cover plate 100 relative to the second welding mark 140, the influence on the welding between the cover plate 100 and the current collector plate 40 can be avoided.

[0098] Reference Figure 2 and Figure 3 , in some embodiments, the difference between the inner diameter of the first groove 111 (as shown by D1 in Figure 2 ) and the diameter of the sealing nail 200 (as shown by D3 in Figure 2 ) is greater than or equal to 0 and less than or equal to 4 mm. For example, this difference can be 1 mm, 2 mm or 3 mm. If the size of the sealing nail 200 is too small, it is likely to cause the sealing nail 200 to shake and deviate too much in the first groove 111, affecting the implementation of the penetration welding.

[0099] Reference Figure 3 and Figure 4 , in some other embodiments, the recess 110 may include a first groove 111 and a second groove 112.

[0100] The edge contour of the first groove 111 may be approximately circular, and the ratio of the inner diameter of the first groove 111 to the diameter of the cover plate 100 can be greater than or equal to 0.2 and less than or equal to 0.3.

[0101] The second groove 112 is disposed in the first groove 111, and the second groove 112 can also be approximately circular. The second groove 112 is disposed in a partial area of the bottom wall of the first groove 111, the second groove 112 extends toward the notch of the first groove 111, and a liquid injection hole 120 is formed in a partial area of the bottom wall of the second groove 112. The first groove 111, the second groove 112 and the liquid injection hole 120 can be coaxially disposed.

[0102] The bottom wall of the second groove 112 has a second welding mark 140, so that the bottom wall of the second groove 112 is penetration-welded to the current collector plate 40 through the second welding mark 140.

[0103] The sealing nail 200 is disposed in the first groove 111, and the first welding mark 130 is used to penetrate-weld the sealing nail 200 to the bottom wall of the first groove 111.

[0104] In this way, by penetratingly welding the bottom wall of the second groove 112 to the current collector plate 40 and penetratingly welding the sealing nail 200 to the bottom wall of the first groove 111, it is possible to avoid the second weld mark 140 overlapping the first weld mark 130 in the thickness direction of the cover plate 100, and it is possible to avoid the influence of the welding process on the second weld mark 140 when welding the sealing nail 200 to the cover plate 100, improving the layout rationality among the components in the battery 10.

[0105] In some embodiments, in the thickness direction of the cover plate 100, the first weld mark 130 does not protrude from the surface where the notch of the first groove 111 is located. In this way, it is possible to avoid the first weld mark 130 and the sealing nail 200 protruding from the surface where the notch of the first groove 111 is located, so that the surface of the cover plate 100 facing away from the liquid injection hole 120 can be in direct contact with the heat dissipation device, facilitating heat dissipation at the cover plate 100.

[0106] Reference Figure 3 and Figure 4 In some embodiments, on the side of the sealing nail 200 facing the liquid injection hole 120, there is a guiding structure 210 that cooperates with the side wall of the second groove 112, and the guiding structure 210 is used to guide the sealing nail 200 to be installed in the first groove 111.

[0107] In this way, by using the guiding structure 210 to cooperate with the side wall of the second groove 112 to guide the sealing nail 200 to be installed in the first groove 111, it is possible to reduce the assembly difficulty when the sealing nail 200 is placed in the first groove 111, and it is also possible to avoid problems such as the sealing nail 200 running off or being not properly installed in the first groove 111, improving the assembly efficiency and alignment accuracy.

[0108] In some embodiments, the guiding structure 210 is spaced from the bottom wall of the second groove 112.

[0109] In this way, by spacing the guiding structure 210 from the bottom wall of the second groove 112, it is possible to avoid the problem that the guiding structure 210 abuts against the bottom wall of the second groove 112 and causes the sealing nail 200 to be spaced from the bottom wall of the first groove 111, thereby helping the surface of the sealing nail 200 facing the liquid injection hole 120 to abut against the bottom wall of the first groove 111, and helping to form the first weld mark 130 on the surface of the sealing nail 200 through the penetration welding process to penetrate-weld the sealing nail 200 to the bottom wall of the first groove 111.

[0110] Reference Figure 3 and Figure 4, in some embodiments, if the contours of the first groove 111 and the second groove 112 are both approximately circular, the guiding structure 210 can also be approximately a guiding flange. The guiding flange is disposed on the surface of the sealing nail 200 facing the liquid injection hole 120 around the central axis of the sealing nail 200, and the guiding flange can extend toward the liquid injection hole 120 away from this surface.

[0111] Reference Figure 4 , in some embodiments, the inner diameter of the guiding flange (such as Figure 4 shown as D4 in Figure 3 ) and the diameter of the sealing nail 200 (such as shown as D3 in

[0112] ) have a ratio greater than or equal to 0.1 and less than or equal to 0.3. For example, the ratio of the inner diameter of the guiding flange to the diameter of the sealing nail 200 can be 0.15 or 0.2. Reference

[0113] , also for example, if the inner side wall of the second groove 112 extends obliquely toward the central axis of the cover plate 100 along the direction from the notch of the second groove 112 to the liquid injection hole 120, the outer side wall of the guiding flange can also extend obliquely from the surface of the sealing nail 200 toward the central axis of the sealing nail 200. Figure 3 Reference

[0114] , in some embodiments, the extending directions of the outer side wall of the guiding flange and the inner side wall of the second groove 112 are the same. For example, if the inner side wall of the second groove 112 extends along the thickness direction of the cover plate 100, the outer side wall of the guiding flange can also extend along the thickness direction of the cover plate 100, and at this time, the outer side wall of the guiding flange is perpendicular to the surface of the sealing nail 200 facing the liquid injection hole 120. Figure 4 , in some embodiments, the spacing distance (such as

[0115] shown as L1 in Figure 3 ) between the guiding structure 210 and the bottom wall of the second groove 112 is greater than or equal to 0.01 mm and less than or equal to 0.4 mm. For example, the spacing distance can be 0.04 mm, 0.1 mm, 0.2 mm or 0.3 mm.

[0116] Reference Figure 5

[0117] The bottom wall of the first groove 111 is provided with a liquid injection hole 120. The sealing nail 200 is arranged in the first groove 111. The ratio of the inner diameter of the first groove 111 to the diameter of the cover plate 100 can be greater than or equal to 0.2 and less than or equal to 0.3.

[0118] The sealing nail 200 may include an annular welding portion 220 and a protrusion portion. The annular welding portion 220 is connected to the outer edge of the protrusion portion. The first welding mark 130 is located on the annular welding portion 220. The protrusion portion protrudes from the annular welding portion 220 away from the bottom wall of the first groove 111.

[0119] In this way, compared with the case of providing two grooves, namely the first groove 111 and the second groove 112, setting it as one groove can obtain a larger area for welding the first welding mark 130 in the radial direction of the cover plate 100 while ensuring that the position of the second welding mark 140 remains unchanged, that is, increasing the width of the annular welding portion 220 in the radial direction, which helps to improve the connection strength and connection stability between the sealing nail 200 and the cover plate 100.

[0120] Reference Figure 5 , in some embodiments, the ratio of the width of the annular welding portion 220 in the radial direction (as shown by H in Figure 5 ) to the inner diameter of the first groove 111 (as shown by D1 in Figure 5 ) is greater than or equal to 0.1 and less than or equal to 0.2. For example, the ratio of the width of the annular welding portion 220 in the radial direction to the inner diameter of the first groove 111 can be 0.12, 0.14, 0.16, or 0.19. If the ratio is too large, it will cause the width of the annular welding portion 220 in the radial direction to be too large, and the distance between the first welding mark 130 and the second welding mark 140 will be too small, resulting in damage and influence to the second welding mark 140 during the welding process between the sealing nail 200 and the cover plate 100. If the ratio is too small, it will cause the width of the annular welding portion 220 in the radial direction to be too small, reducing the connection strength and connection stability between the sealing nail 200 and the cover plate 100.

[0121] Reference Figures 2 to 5 , in some embodiments, the battery 10 may further include a sealing plug 300. The sealing plug 300 is arranged in the liquid injection hole 120, and the sealing plug 300 is used to seal the liquid injection hole 120.

[0122] In this way, by sealing the liquid injection hole 120 with the sealing plug 300, the probability of the liquid in the housing 20 leaking from the liquid injection hole 120 can be reduced, and the sealing performance can be improved.

[0123] Reference Figure 3 , in some embodiments, there is a first gap 230 (as shown by L2 in Figure 3 ) between the surface of the sealing nail 200 facing the liquid injection hole 120 and the surface of the sealing plug 300 facing the sealing nail 200.

[0124] In this way, by disposing the surface of the sealing nail 200 facing the liquid injection hole 120 and the surface of the sealing plug 300 facing the sealing nail 200 at an interval, a buffer space can be formed between the sealing plug 300 and the sealing nail 200, so as to prevent the sealing plug 300 from directly pressing against the sealing nail 200 when it expands due to heat and moves toward the sealing nail 200, thereby reducing the probability that the sealing nail 200 is separated from the cover plate 100 due to being squeezed by the sealing plug 300.

[0125] In some embodiments, the first interval 230 is greater than or equal to 0.01 mm. For example, the first interval 230 can be 0.02 mm, 0.1 mm, 0.2 mm, or 0.37 mm. Alternatively, the first interval 230 can be greater than or equal to 0.01 mm and less than or equal to 0.4 mm.

[0126] In this way, if the distance of the first interval 230 is too small, the buffer effect of the first interval 230 will be reduced. If the distance of the first interval 230 is too large, the sealing nail 200 will occupy a large space and the structural compactness between the components will be reduced.

[0127] Reference Figure 5 , in some embodiments, the recess 110 is the first groove 111, and the bottom wall of the first groove 111 has a second welding mark 140 for penetrating and welding the cover plate 100 to the current collector plate 40. One side of the sealing nail 200 facing the liquid injection hole 120 has a third groove 240, and there is a second interval 250 (as shown by L3 in Figure 5 ) between the bottom wall of the third groove 240 and the bottom wall of the first groove 111.

[0128] In some embodiments, the second welding mark 140 can be located within the second interval 250, so as to prevent the sealing nail 200 from abutting against the second welding mark 140. Moreover, by providing the third groove 240 on the surface of the sealing nail 200 facing the liquid injection hole 120, the distance between the surface of the sealing nail 200 facing the liquid injection hole 120 and the surface of the sealing plug 300 facing away from the liquid injection hole 120 can be increased, further reducing the probability that the sealing plug 300 presses against the sealing nail 200 and improving the connection stability between the sealing nail 200 and the cover plate 100.

[0129] In some embodiments, the second interval 250 can be greater than or equal to 0.05 mm and less than or equal to 2 mm. For example, the second interval 250 can be 0.1 mm, 0.15 mm, or 2 mm.

[0130] Reference Figure 5 , in an exemplary embodiment, the inner diameter of the third groove 240 (as shown by D5 in Figure 5 ) and the sealing nail 200 (as shown inFigure 5 The ratio of the diameter of the third groove 240 (as shown in D3) to the diameter of the sealing nail 200 is greater than or equal to 0.1 and less than or equal to 0.3. For example, the ratio of the inner diameter of the third groove 240 to the diameter of the sealing nail 200 can be 0.15 mm, 2 mm, or 2.5 mm.

[0131] Reference Figure 5 , in some embodiments, the thickness of the sealing nail 200 is less than the thickness of the cover plate 100. By making the thickness of the sealing nail 200 less than the thickness of the cover plate 100, it is convenient to implement the penetration welding process from the thinner sealing nail 200 to the thicker cover plate 100, reducing the probability of failure to penetrate during penetration welding and improving the welding effect of the penetration welding between the sealing nail 200 and the cover plate 100.

[0132] Reference Figure 5 , in some embodiments, the thickness of the sealing nail 200 is greater than or equal to 0.08 mm and less than or equal to 0.6 mm. For example, the thickness of the sealing nail 200 can be 0.1 mm, 0.2 mm, 0.3 mm, or 0.5 mm.

[0133] In this way, by making the thickness of the sealing nail 200 greater than or equal to 0.08 mm and less than or equal to 0.6 mm, the problem of reducing the structural strength of the sealing nail 200 due to the too thin thickness of the sealing nail 200 can be avoided, and the problem of affecting the welding effect of penetration welding due to the too thick thickness of the sealing nail 200 can be avoided.

[0134] Reference Figure 6 , the embodiment of the present application further provides an electronic device, which may include the above-mentioned battery 10.

[0135] The electronic device 1 is a vehicle, and the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc., but not limited thereto. The working part 11 is the vehicle body, and the battery pack 50 is arranged at the bottom of the vehicle body and provides electrical energy support for the running of the vehicle or the operation of the electrical components in the vehicle. However, in some other embodiments, the electronic device 1 can also be a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the working part 11 can be a unit component that can obtain the electrical energy of the battery pack 50 and perform corresponding work, such as the fan blade rotation unit of a fan, the dust suction working unit of a vacuum cleaner, etc.

[0136] The electric toys include stationary or mobile electric toys, such as gaming machines, electric toy cars, electric toy ships, electric toy planes, and so on; the electric tools include metal-cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, and so on. The embodiments of the present application do not impose special restrictions on the above-mentioned electronic device 1.

[0137] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0138] It should be noted that phrases such as "in specific implementation", "in some embodiments", "in this embodiment", and "exemplarily" mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining an embodiment to describe a specific feature, structure, or characteristic, implementing such a feature, structure, or characteristic in combination with other embodiments, whether explicitly or implicitly described, is within the knowledge scope of those skilled in the art.

[0139] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used in the text can be used to describe any feature, structure, or characteristic in the sense of singularity, or can be used to describe a combination of features, structures, or characteristics in the sense of plurality. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood to convey singular usage or plural usage.

[0140] It should be easily understood that the terms "on...", "above...", and "over..." in this disclosure should be interpreted in the broadest manner, so that "on..." not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above..." or "over..." not only includes the meaning of "above or over something", but also can include the meaning of "above or over something" without intermediate features or layers therebetween (that is, directly on something).

[0141] In addition, for ease of description, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to another as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatial relative descriptors used in the text may be interpreted accordingly as well.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that, Comprising: A housing including an opening; An electrode assembly accommodated within the housing; A current collector plate disposed at one end of the electrode assembly facing the opening and electrically connected to the electrode assembly; A cover plate covering the opening, the cover plate including a first surface facing away from the electrode assembly and a second surface facing the electrode assembly, a depression being provided on the first surface, and a liquid injection hole being provided in the bottom wall of the depression; A sealing nail disposed within the depression, and the sealing nail being used for sealing the liquid injection hole; In the thickness direction of the cover plate, the top of the sealing nail facing away from the second surface does not protrude from the depression; The surface of the sealing nail facing away from the cover plate has a first welding mark, the outer edge of the sealing nail surrounds the first welding mark, and the first welding mark penetrates through the sealing nail to reach the inside of the bottom wall of the depression; The ratio of the diameter of the depression to the diameter of the cover plate is greater than or equal to 0.2 and less than or equal to 0.

3.

2. The battery according to claim 1, wherein The bottom wall of the depression has a second welding mark, and the second welding mark penetrates through the bottom wall of the depression to reach the inside of the current collector plate.

3. The battery according to claim 2, characterized in that, The depression includes: A first groove; A second groove provided in a partial area of the bottom wall of the first groove, and a partial area of the bottom wall of the second groove is provided with the liquid injection hole; The bottom wall of the second groove has the second welding mark; The sealing nail is disposed within the second groove, and the first welding mark is used for penetrating and welding the sealing nail to the bottom wall of the second groove; In the radial direction of the cover plate, the first welding mark surrounds and encloses the second welding mark, and the first welding mark and the second welding mark are spaced apart in the radial direction of the second groove.

4. The battery according to claim 3, characterized in that, The difference between the inner diameter of the first groove and the diameter of the sealing nail is greater than or equal to 0 and less than or equal to 4 mm.

5. The battery according to claim 2, characterized in that, The depression includes: A first groove; A second groove provided in a partial area of the bottom wall of the first groove, and a partial area of the bottom wall of the second groove is provided with the liquid injection hole; The bottom wall of the second groove has the second welding mark; The sealing nail is disposed within the first groove, and the first welding mark is used for penetrating and welding the sealing nail to the bottom wall of the first groove; In the thickness direction of the cover plate, the first welding mark does not protrude from the surface where the notch of the first groove is located.

6. The battery according to claim 5, characterized in that, One side of the sealing nail facing the liquid injection hole has a guiding structure that cooperates with the side wall of the second groove, and the guiding structure is used for guiding the sealing nail to be installed within the first groove; And / or, the guiding structure is spaced apart from the bottom wall of the second groove; And / or, the spacing distance between the guiding structure and the bottom wall of the second groove is greater than or equal to 0.01 mm and less than or equal to 0.4 mm.

7. The battery according to claim 2, wherein, The depression is a first groove; The bottom wall of the first groove is provided with the liquid injection hole, and the sealing nail is disposed within the first groove; The sealing nail includes an annular welding portion and a protruding portion, the annular welding portion is connected to the outer edge of the protruding portion, the first welding mark is located at the annular welding portion, and the protruding portion protrudes relative to the annular welding portion away from the bottom wall of the first groove; The ratio of the width of the welding part along its radial direction to the inner diameter of the first groove is greater than or equal to 0.1 and less than or equal to 0.

2.

8. The battery according to claim 1, wherein The battery further includes a sealing plug; The sealing plug is arranged in the liquid injection hole, and the sealing plug is used to seal the liquid injection hole.

9. The battery according to claim 8, wherein, There is a first gap between the surface of the sealing nail facing the liquid injection hole and the surface of the sealing plug facing the sealing nail; And / or, the first gap is greater than or equal to 0.01 mm and less than or equal to 0.4 mm.

10. The battery according to claim 9, characterized in that, The depression is a first groove, and the bottom wall of the first groove has a second welding mark, and the second welding mark is used for penetration welding connection of the cover plate to the current collector plate; One side of the sealing nail facing the liquid injection hole has a third groove, and there is a second gap between the bottom wall of the third groove and the bottom wall of the first groove; The second welding mark is located within the second gap; And, the second gap is greater than or equal to 0.05 mm and less than or equal to 2 mm; The ratio of the inner diameter of the third groove to the diameter of the sealing nail is greater than or equal to 0.1 and less than or equal to 0.

3.

11. The battery according to any one of claims 1 to 10, characterized in that, The thickness of the sealing nail is less than the thickness of the cover plate; And / or, the thickness of the sealing nail is greater than or equal to 0.08 mm and less than or equal to 0.6 mm.

12. The battery according to any one of claims 1 to 10, characterized in that, The material of the cover plate is steel.

13. An electronic device, characterized in that, A battery according to any one of claims 1 to 12.

Images