Battery and electronic device

Abstract

The utility model provides a battery and an electronic device, and relates to the technical field of batteries. The electrode assembly is accommodated in the shell, and one side, facing the opening, of the electrode assembly comprises a tab; the current collecting plate is electrically connected with the tabs; the cover plate is welded with the shell to seal the opening, the cover plate comprises a cover plate body and a first boss which surrounds the cover plate body and protrudes towards the electrode assembly, the first boss is embedded into the opening, the cover plate body comprises a weak structure which is arranged around the center of the cover plate body, and the weak structure is broken when the pressure in the battery exceeds a threshold value; the cover plate body comprises a welding area, and the welding area is located between the weak structure and the first boss and connected with the collector plate in a welded mode. According to the battery, the transmission path of current on the cover plate can be shortened, so that the current transmission efficiency is improved, and the internal resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and an electronic device. Background Art

[0002] With the development of social economy, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc.

[0003] At present, for some models of batteries, the current collector plate is welded to the tab of the electrode assembly and the cover plate respectively to realize the conduction between the electrode assembly and the cover plate. However, since the welding area where the current collector plate is welded to the cover plate is in the central area of the current collector plate and the cover plate, when the current is transmitted from the current collector plate to the cover plate, it often transmits from the center of the cover plate to the edge, with a long current-carrying path and large internal resistance. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides a battery and an electronic device, which can shorten the transmission path length of the current on the cover plate and reduce the internal resistance.

[0005] The utility model provides a battery, comprising: a housing including an opening; an electrode assembly accommodated in the housing, one side of the electrode assembly facing the opening including tabs; a current collector plate electrically connected to the tabs; a cover plate sealing the opening by welding to the housing, the cover plate including a cover plate body and a first boss surrounding the cover plate body and protruding toward the electrode assembly, the first boss being embedded in the opening, the cover plate body including a weak structure provided around the center of the cover plate body, the weak structure breaking when the pressure inside the battery exceeds a threshold; wherein, the cover plate body includes a welding area located between the weak structure and the first boss and welded to the current collector plate.

[0006] In some embodiments, a first groove is defined on a side of the first boss facing away from the electrode assembly.

[0007] In some embodiments, at least one of the current collector plate and the cover plate has a boss structure protruding toward the other, and the current collector plate and the cover plate are welded through the boss structure.

[0008] In some embodiments, a second boss protruding toward the electrode assembly is provided on the cover plate, the second boss constituting the boss structure, a second groove being defined on a side of the second boss facing away from the electrode assembly, the second groove including a bottom wall, and the welding area being located on the bottom wall of the second groove.

[0009] In some embodiments, the width W1 of the first groove ranges from 0.5 mm ≤ W1 ≤ 5 mm; and / or, the width W2 of the second groove ranges from 0.5 mm ≤ W2 ≤ 7 mm; and / or, the second groove further includes an outer groove wall surrounding the outer periphery of the bottom wall, and the distance W3 between the outer groove wall of the second groove and the side wall of the housing ranges from 1.5 mm ≤ W3 ≤ 10 mm.

[0010] In some embodiments, the distance W4 between the radially inner edge of the welding area and the weak structure in the radial direction of the cover plate ranges from W4 ≥ 2 mm.

[0011] In some embodiments, the thickness t2 of the welding area and the thickness t1 of the cover plate body satisfy: 0.3 t1 ≤ t2 ≤ (t1 + 0.1) mm.

[0012] In some embodiments, the current collector plate includes a plate body and a thickened portion, the thickened portion is opposite to the welding area, and the thickened portion is welded to the welding area.

[0013] In some embodiments, the thickness t3 of the portion where the thickened portion extends beyond the plate body satisfies: 0.2 mm ≤ t3 ≤ 3 mm.

[0014] In some embodiments, the cover plate is a steel structure member.

[0015] The second aspect of the present utility model provides an electronic device, including: the battery described in the first aspect of the present utility model.

[0016] For the battery of the present utility model, a first boss and a weak structure are provided on the cover plate, the first boss is used for assembling with the housing, the weak structure is used for pressure relief, and the welding area for welding the cover plate to the current collector plate is arranged between the first boss and the weak structure, that is, the current collector plate and the cover plate are welded in a non - central area, so that the welding area of the current collector plate and the cover plate is closer to the edge position of the cover plate, which can shorten the length of the current transmission path when the current reaches the cover plate from the current collector plate and then is transmitted to the edge of the cover plate, thereby improving the current transmission efficiency, reducing the internal resistance, reducing heat generation, and improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order 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 use in 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, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1Schematic structural diagram of the battery according to some embodiments of the present utility model;

[0019] Figure 2 is the sectional view along Figure 1 section A-A in;

[0020] Figure 3 is Figure 2 the enlarged view of the circled part B in;

[0021] Figure 4 Schematic structural diagram of the current collector plate according to an embodiment of the present utility model;

[0022] Figure 5 is the sectional view along Figure 4 section C-C in;

[0023] Figure 6 Schematic structural diagram of the cover plate according to an embodiment of the present utility model;

[0024] Figure 7 is the sectional view along Figure 6 section D-D in

[0025] Figure 8 Sectional view of the electrode assembly according to an embodiment of the present utility model.

[0026] Description of reference numerals:

[0027] 100 - battery;

[0028] 1 - outer shell; 11 - side wall; 12 - top wall;

[0029] 2 - cover plate; 20 - cover plate body; 21 - first boss; 22 - first groove; 23 - second boss; 24 - second groove; 241 - bottom wall; 242 - outer groove wall; 25 - weak structure; 26 - welding area;

[0030] 3 - current collector plate; 30 - plate body; 31 - thickened part;

[0031] 4 - electrode assembly; 41 - tab; 42 - positive electrode plate; 421 - positive electrode current collector; 422 - positive electrode active layer; 423 - positive electrode tab; 43 - negative electrode plate; 431 - negative electrode current collector; 432 - negative electrode active layer; 44 - separator;

[0032] 5 - positive electrode current collector plate; 6 - pole post. Detailed implementation manners

[0033] In order to make the above-mentioned 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 in conjunction with 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.

[0034] With the development of social economy, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc. Currently, for some models of batteries, the current collector plate is welded to the tab of the electrode assembly and the cover plate respectively, so as to realize the conduction between the electrode assembly and the cover plate. However, since the welding area where the current collector plate is welded to the cover plate is in the central area of the current collector plate and the cover plate, when the current is transmitted from the current collector plate to the cover plate, it often transmits from the center of the cover plate to the edge, with a relatively long current-carrying path and a large internal resistance.

[0035] In view of this, the embodiments of the present utility model provide a battery and an electronic device. By welding the current collector plate and the non-central area of the housing, the welding area of the current collector plate and the cover plate is closer to the edge position of the cover plate, which can shorten the length of the current transmission path when the current reaches the cover plate from the current collector plate and then transmits to the edge of the cover plate, thereby improving the current transmission efficiency, reducing the internal resistance, reducing heat generation, and improving the energy utilization rate.

[0036] The following refers to Figures 1-8 Describe the battery 100 according to the embodiments of the present utility model.

[0037] The battery 100 of this embodiment can be a primary battery or a secondary battery. A primary battery refers to a battery that cannot be recharged and reused after discharging, and a secondary battery refers to a battery that can activate the active material and continue to be used by charging after discharging. The battery can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-cadmium battery, etc. The battery 100 can be a square shell battery or a cylindrical battery, etc. The embodiments of the present application do not limit this.

[0038] In the following, the battery 100 of this embodiment is taken as an example of a cylindrical battery for illustration.

[0039] Combined with Figures 1-3 The battery 100 of this embodiment may include: a housing 1, a cover plate 2, a current collector plate 3, and an electrode assembly 4.

[0040] Combined with Figure 2, wherein the outer shell 1 can be cylindrical. The outer shell 1 defines a receiving cavity with one end open. For example, the bottom end of the receiving cavity is open. The outer shell 1 further includes a side wall 11 and a top wall 12. The side wall 11 surrounds the circumferential side of the top wall 12. The top wall 12 is located at one end of the side wall 11 opposite to the opening. The battery 100 is further provided with a positive current collector plate 5 and a pole post 6. The pole post 6 penetrates through the top wall. One end of the electrode assembly 4 facing the pole post 6 is provided with a positive ear 423. The positive current collector plate 5 is arranged between the pole post 6 and the electrode assembly 4. The positive current collector plate 5 is welded to the pole post 6 and the positive ear 423 of the electrode assembly 4 respectively. At this time, the above current collector plate 3 can be used as the negative current collector plate of the battery 100, and the ear 41 at one end of the electrode assembly 4 facing the cover plate 2 serves as the negative ear of the electrode assembly 4.

[0041] The cover plate 2 is covered at the opening of the outer shell 1 to seal the opening, so that the receiving cavity is formed into a closed cavity to better accommodate the electrode assembly 4 and the electrolyte.

[0042] Combined Figure 8 , the electrode assembly 4 can include a positive electrode plate 42, a negative electrode plate 43 and a separator 44. Among them, the positive electrode plate 42 can include a positive current collector 421 and a positive active layer 422 coated on the surface of the positive current collector 421. The negative electrode plate 43 can include a negative current collector 431 and a negative active layer 432 coated on the surface of the negative current collector 431. The positive electrode plate 42, the separator 44 and the negative electrode plate 43 are stacked and wound in sequence to form a wound electrode assembly. The electrode assembly 4 is arranged in the receiving cavity of the outer shell 1. One side of the electrode assembly 4 facing the cover plate 2 is provided with an ear 41, and the ear is welded to the current collector plate 3. In this way, the electrode assembly 4 can be conducted with the cover plate 2 through the current collector plate 3, so as to conduct current transmission with the external circuit.

[0043] The current collector plate 3 is arranged in the receiving cavity, and the current collector plate 3 is electrically connected to the ear 41, such as by welding.

[0044] The cover plate 2 includes a cover plate body 20 and a first boss 21. The first boss 21 surrounds the cover plate body 20 and protrudes toward the electrode assembly 4. The first boss 21 is embedded in the opening, and the first boss 21 can be in interference fit with the outer shell 1.

[0045] The cover plate body 20 may further be provided with a weak structure 25. The weak structure 25 may be arranged around the central area of the cover plate body 20 and formed into a ring shape. The central area includes the center point of the cover plate 2 and the area within a certain distance around the center point. The weak structure 25 is configured to break when the pressure inside the battery 100 exceeds a threshold value, so as to release the internal pressure, that is, the weak structure 25 serves as an explosion-proof valve of the battery 100. For example, the weak structure 25 may be formed by processes such as blanking or etching the cover plate 2, so that the thickness of the weak structure 25 is smaller than the thickness of the rest of the cover plate 2, thereby making the strength of the weak structure 25 lower than that of the rest of the cover plate 2. In this way, when high-pressure gas is generated in the electrolyte inside the battery 100 due to reasons such as short circuit of the battery 100, the high-pressure gas can break through the cover plate 2 from the weak structure 25 to relieve pressure, reduce potential safety hazards, and improve safety.

[0046] The cover plate body 20 includes a welding area 26, which is located between the weak structure 25 and the first boss 21, and the welding area 26 is welded and connected to the current collector plate 3. In other words, the current collector plate 3 can be welded to the non-central area of the cover plate 2, and the non-central area here refers to the part of the cover plate 2 other than the central area.

[0047] For the battery 100 according to the embodiment of the present invention, the first boss 21 and the weak structure 25 are arranged on the cover plate 2. The first boss 21 is used for assembling with the outer shell 1, the weak structure 25 is used for relieving pressure, and the welding area of the cover plate 2 for welding with the current collector plate 3 is arranged between the first boss 21 and the weak structure 25, that is, the current collector plate 3 is welded to the non-central area of the cover plate 2, so that the welding area 26 between the current collector plate 3 and the cover plate 2 is closer to the edge position of the cover plate 2, which can shorten the length of the current transmission path when the current reaches the cover plate 2 from the current collector plate 3 and then is transmitted to the edge of the cover plate 2, thereby improving the current transmission efficiency, reducing the internal resistance, reducing heat generation, and improving the energy utilization rate.

[0048] In addition, since the welding area 26 is located between the weak structure 25 and the first boss 21, compared with the scheme where the welding area is within the area surrounded by the weak structure, when the battery 100 relieves pressure, it can prevent the current collector plate 3 from pulling the weak structure 25, thereby ensuring that the weak structure 25 opens the valve smoothly, so as to facilitate the ejection and pressure relief of the internal substances of the battery 100.

[0049] In some embodiments, referring to Figure 3 and Figure 7 , a first groove 22 is defined on the side of the first boss 21 facing away from the accommodating cavity. For example, the first boss 21 can be formed by stamping the cover plate 2, and at the same time when the first boss 21 is formed, the first groove 22 is formed on the other side of the cover plate 2. The welding area 26 of the cover plate 2 is located between the first groove 22 and the central area of the cover plate 2.

[0050] In this way, on the one hand, the transmission path of the current on the cover plate 2 is shortened and the internal resistance is reduced. On the other hand, the welding heat between the cover plate 2 and the current collecting plate 3 can be prevented from affecting the connection and cooperation between the first boss 21 and the outer shell 1. Moreover, when the cover plate 2 and the outer shell 1 are welded by laser welding, the first boss 21 also plays a role in shielding the laser, preventing the laser from being reflected between the first boss 21 and the outer shell 1 and finally reaching the electrode assembly 4. In this embodiment, the welding area 26 of the cover plate 2 is arranged between the first groove 22 and the central area of the cover plate 2, which can prevent the welding heat between the cover plate 2 and the current collecting plate 3 from affecting the laser blocking effect of the first boss 21, thereby better protecting the electrode assembly 4.

[0051] Due to the presence of the first boss 21, there is a height difference between the cover plate 2 and the current collecting plate 3 in areas other than the first boss 21. To enable the cover plate 2 and the current collecting plate 3 to overcome this height difference and achieve a better weld connection, in this embodiment, at least one of the current collecting plate 3 and the cover plate 2 has a boss structure protruding toward the other, and the current collecting plate 3 and the cover plate 2 are welded via the boss structure. For example, a boss structure protruding toward the cover plate 2 can be provided only on the current collecting plate 3; alternatively, a boss structure protruding toward the current collecting plate 3 can be provided only on the cover plate 2; alternatively, the current collecting plate 3 and the cover plate 2 can each be provided with a boss structure protruding toward each other. In this way, the boss structure can be used to fill the height difference, thereby achieving a better welding between the current collecting plate 3 and the cover plate 2.

[0052] In some embodiments, combined Figure 2 、 Figure 3 and Figure 7 , a second boss 23 protruding toward the electrode assembly 4 is provided on the cover plate 2, and the second boss 23 constitutes the above-mentioned boss structure. The second boss 23 is located on the radial inner side of the first boss 21 and is spaced apart from the first boss 21. The second boss 23 defines a second groove 24 on the side facing away from the accommodating cavity. The second groove 24 includes a bottom wall 241 and an outer groove wall 242 surrounding the outer periphery of the bottom wall 241. The welding area 26 is located on the bottom wall of the second groove 24. In this way, on the one hand, the second boss 23 can fill the gap between the current collecting plate 3 and the cover plate 2, and on the other hand, the second groove 24 can be used to provide an accommodating space for the welding head of welding equipment such as laser welding equipment. At the same time, the provision of the second groove 24 can reduce the wall thickness of the cover plate 2 and the second boss 23, so that the welding energy can more easily reach the current collecting plate 3 side from the cover plate 2 side to ensure the welding effect.

[0053] Optionally, the cover plate 2 may be punched to form the second boss 23, and while forming the second boss 23, the second groove 24 is formed on the other side of the cover plate 2. In this way, the processing technology of the cover plate 2 is relatively simple and easy to implement.

[0054] In some embodiments, reference Figure 3, the value range of the width W1 of the first groove 22 is: 0.5 mm ≤ W1 ≤ 5 mm. For example, the value of the width W1 of the first groove 22 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm. Of course, the present utility model does not limit this, and the value of the width W1 of the first groove 22 can be reasonably selected within the above range according to actual needs. In this way, when the width of the first groove 22 is too small, for example, less than 0.5 mm, it can be avoided that the processing difficulty increases, and the welding heat of the cover plate 2 and the current collector plate 3 easily affects the fit between the first boss 21 and the housing 1; it can also be avoided that the width of the first groove 22 is too large, for example, greater than 5 mm, which occupies too much space in the radial direction, resulting in an increase in the distance between the welding area 26 of the cover plate 2 and the current collector plate 3 and the edge of the cover plate 2, which is not conducive to shortening the current-carrying path on the cover plate 2 and reducing the internal resistance.

[0055] Reference Figure 3 , the value range of the width W2 of the second groove 24 is: 0.5 mm ≤ W2 ≤ 7 mm. For example, the value of the width W2 of the second groove 24 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm or 7 mm. Of course, the present utility model does not limit this, and the value of the width W2 of the second groove 24 can be reasonably selected within the above range according to actual needs. In this way, when the width of the second groove 24 is too small, for example, less than 0.5 mm, it can be avoided that the processing difficulty increases, and the width of the welding area 26 is too small, resulting in a reduction in the current-carrying capacity and an increase in the internal resistance and serious heat generation at the welded joint formed by the current collector plate 3 and the cover plate 2; it can also be avoided that the width of the second groove 24 is too large, for example, greater than 7 mm, which results in an increase in the distance between the welding area 26 of the cover plate 2 and the current collector plate 3 and the edge of the cover plate 2, which is also not conducive to shortening the current-carrying path on the cover plate 2 and reducing the internal resistance.

[0056] Reference Figure 3, the value range of the distance W3 between the outer groove wall 242 of the second groove 24 and the side wall of the housing 1 is: 1.5 mm ≤ W3 ≤ 10 mm. For example, the value of the distance W3 between the outer groove wall 242 of the second groove 24 and the side wall of the housing 1 can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm or 10 mm. Of course, the present utility model does not limit this. The value of the distance W3 between the outer groove wall 242 of the second groove 24 and the side wall of the housing 1 can be reasonably selected within the above range according to actual needs. In this way, it can be avoided that when the distance between the second groove 24 and the side wall of the housing 1 is too small, such as less than 1.5 mm, it will increase the processing difficulty of the first boss 21, and the welding heat of the cover plate 2 and the current collector plate 3 is likely to affect the fit between the first boss 21 and the housing 1; it can also be avoided that the distance W3 between the outer groove wall 242 of the second groove 24 and the side wall of the housing 1 is too large, such as greater than 10 mm, which will cause the distance between the welding area 26 of the cover plate 2 and the current collector plate 3 and the edge of the cover plate 2 to increase, which is not conducive to shortening the current-carrying path on the cover plate 2 and reducing the internal resistance.

[0057] Reference Figure 3 , optionally, the weak structure 25 is located inside the second groove 24, and the value range of the distance W4 between the radial inner edge of the welding area 26 and the weak structure 25 in the radial direction of the cover plate 2 is: W4 ≥ 2 mm. It can be understood that the distance W4 between the inner edge of the welding area 26 and the weak structure 25 is less than the distance between the inner edge of the welding area 26 and the center point of the cover plate 2. The distance W4 between the inner edge of the welding area 26 and the weak structure 25 can be reasonably selected within the above range. In this way, it can be avoided that the welding heat of the cover plate 2 and the current collector plate 3 is likely to affect the structure of the weak structure 25, thereby affecting the bursting threshold and stability of the weak structure 25, resulting in the failure of the function of the weak structure 25.

[0058] In some embodiments, reference Figure 3 , the thickness t2 of the welding area 26 of the cover plate 2 and the thickness t1 of the cover plate body 20 satisfy: 0.3 t1 ≤ t2 ≤ (t1 + 0.1) mm. For example, the ratio of the thickness t2 of the welding area 26 of the cover plate 2 to the thickness t1 of the cover plate body 20 can be 0.3, 0.4, 0.5, 0.6, 0.6, 0.7, 0.8, 0.9, 1, where the maximum value of the thickness t2 of the welding area 26 of the cover plate 2 is t1 + 0.1. Preferably, the thickness t2 of the welding area 26 and the thickness t1 of the cover plate body 20 satisfy: 0.8 t1 ≤ t2 ≤ (t1 + 0.1) mm. In this way, it can be avoided that when the thickness of the welding area 26 is too small, the welding energy easily penetrates through the cover plate 2 and the current collector plate 3, resulting in damage to the electrode assembly 4; it can also be avoided that when the thickness of the welding area 26 is too large, the welding energy is difficult to penetrate through the cover plate 2 to reach the current collector plate 3, resulting in problems such as poor welding, false welding and low welding efficiency.

[0059] In some embodiments, in combination with Figures 3-5 , the current collector plate 3 includes a plate body 30 and a thickened portion 31. The thickness of the thickened portion 31 is greater than the thickness of the plate body 30. The thickened portion 31 is opposite to the welding area 26 of the cover plate 2 and is welded. For example, the thickened portion 31 and the plate body 30 may be of the same material. At this time, the thickened portion 31 is integrally formed on the plate body 30; alternatively, the thickened portion 31 may also be formed by compounding other materials on the plate body 30. For example, after compounding SPCC (generally cold-rolled carbon steel sheet and strip) on the current collector plate 3, the thickened portion 31 is formed.

[0060] In this embodiment, by providing the thickened portion 31 and welding the thickened portion 31 to the cover plate 2, it can be avoided that the welding energy penetrates through the current collector plate 3, resulting in damage to the electrode assembly 4.

[0061] In some embodiments, referring to Figure 3 , the thickness t3 of the portion of the thickened portion 31 that extends beyond the plate body 30 satisfies: 0.2 mm ≤ t3 ≤ 3 mm. For example, the thickness t3 of the portion of the thickened portion 31 that extends beyond the plate body 30 may be 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm. Of course, the present invention is not limited thereto, and the thickness t3 of the portion of the thickened portion 31 that extends beyond the plate body 30 can be reasonably selected within the above range according to actual needs. In this way, it can be prevented that when the thickness t3 of the portion of the thickened portion 31 that extends beyond the plate body 30 is too small, for example, less than 0.2 mm, the thickness of the thickened portion 31 is too small, and the welding difficulty between the current collector plate 3 and the cover plate 2 is large, and the current collector plate 3 cannot be effectively prevented from being welded through; it can also be prevented that when the thickness t3 of the portion of the thickened portion 31 that extends beyond the plate body 30 is too large, for example, greater than 3 mm, the overall thickness of the current collector plate 3 is too large, and the internal space of the battery 100 occupied is large, which is not conducive to improving the energy density of the battery 100.

[0062] Optionally, referring to Figure 3, the thickness t4 of the thickened portion 31 and the thickness t3 of the portion where the thickened portion 31 extends beyond the disk body 30 satisfy: 0.05 mm ≤ t4 - t3 ≤ 1 mm. For example, the difference between the total thickness t4 of the thickened portion 31 and the thickness t3 of the portion where the thickened portion 31 extends beyond the disk body 30 can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. In other words, the thickness of the remaining portion of the current collecting disk 3 except the thickened portion 31 (i.e., the disk body 30) is 0.05 mm - 1 mm. Of course, the present utility model does not limit this. The difference between the thickness t4 of the thickened portion 31 and the thickness t3 of the portion where the thickened portion 31 extends beyond the disk body 30 can be reasonably selected within the above range according to actual needs. In this way, when the thickness of the current collecting disk 3 is too small, it can be prevented that the current collecting disk 3 is easily welded through; when the thickness of the current collecting disk 3 body is too large, it can be prevented that the current collecting disk 3 occupies a relatively large internal space of the battery 100.

[0063] In some embodiments, the cover plate 2 is a steel structure member. For example, the cover plate 2 is a cold-rolled steel plate, such as cold-rolled carbon steel sheets and strips (SPCC) generally used. In this way, the cover plate 2 has sufficient strength and good pressure resistance performance.

[0064] The following describes the electronic device according to the second aspect of the present utility model.

[0065] The electronic device of the present embodiment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. 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 electric vehicle, or an extended-range electric vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electronic device can also be a battery pack, a battery module, etc. The embodiments of the present application do not make special restrictions on the above-mentioned electronic devices.

[0066] Specifically, the electronic device of the present embodiment can include: a device main body and the battery 100 in the above embodiment. The device main body is provided with a battery compartment. The battery can be provided with a power supply interface. The battery 100 can be disposed in the battery compartment and electrically connected to the power supply interface. In this way, the battery 100 can supply power to the device main body.

[0067] The electronic device according to the embodiment of the present utility model, by adopting the battery 100 of the above embodiment, since the internal resistance of the battery 100 is smaller and the heat generation is less, it can better supply power to the electronic device, which is beneficial to improving the user experience.

[0068] It should be noted that the embodiments referred to in the specification, such as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc., 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 specific features, structures or characteristics with an embodiment, implementing such features, structures or characteristics in combination with other embodiments, whether explicitly or implicitly described, is within the knowledge scope of those skilled in the art.

[0069] 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.

[0070] It should be easily understood that the terms "on", "above", and "over" in the present 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 (i.e., directly on something).

[0071] In addition, in order to facilitate the description, spatial relative terms can be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature relative to other elements or features as shown in the figure. Spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. The device can have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive words used in the text can be interpreted accordingly.

[0072] 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: include: an enclosure, including an opening; an electrode assembly housed in the housing, wherein a side of the electrode assembly facing the opening includes an electrode tab; a current collecting plate, electrically connected to the tab; a cover plate, the opening being sealed by welding to the outer shell, the cover plate comprising a cover plate body and a first boss surrounding the cover plate body and protruding toward the electrode assembly, the first boss being embedded in the opening, the cover plate body comprising a weakening structure disposed around the center of the cover plate body, the weakening structure being broken when the pressure inside the battery exceeds a threshold; wherein, The cover plate body includes a welding area, which is located between the weak structure and the first boss and is welded to the collecting plate.

2. The battery according to claim 1, characterized in that, A first groove is defined on a side of the first boss facing away from the electrode assembly.

3. The battery according to claim 2, characterized in that At least one of the current collecting plate and the cover plate has a boss structure protruding toward the other, and the current collecting plate and the cover plate are welded via the boss structure.

4. The battery according to claim 3, characterized in that A second boss protruding toward the electrode assembly is provided on the cover plate, the second boss constituting the boss structure, the second boss defining a second groove on the side facing away from the electrode assembly, the second groove including a bottom wall, and the welding area being located on the bottom wall.

5. The battery according to claim 4, characterized in that The width W1 of the first groove has a value range of: 0.5 mm ≤ W1 ≤ 5 mm; and / or, The width W2 of the second groove is in the range of 0.5 mm ≤ W2 ≤ 7 mm; and / or, The second groove further includes an outer groove wall surrounding the outer circumference of the bottom wall, and a distance W3 between the outer groove wall and the side wall of the shell has a value range of: 1.5 mm ≤ W3 ≤ 10 mm.

6. The battery according to claim 4, characterized in that The range of the distance W4 between the radial inner edge of the welding zone and the weak structure in the radial direction of the cover plate is: W4 ≥ 2 mm.

7. The battery according to claim 1, characterized in that, The thickness t2 of the welding area and the thickness t1 of the cover plate body satisfy: 0.3 t1 ≤ t2 ≤ (t1 + 0.1) mm.

8. The battery according to claim 1, characterized in that The current collecting disk includes a disk body and a thickened portion, wherein the thickened portion is opposite to the welding area and is welded to the welding area.

9. The battery according to claim 8, characterized in that, The thickness t3 of the portion of the thickened portion that exceeds the disc body satisfies the following: 0.2 mm ≤ t3 ≤ 3 mm.

10. The battery according to any one of claims 1-9, characterized in that, The cover plate is a steel structure.

11. An electronic device, characterized in that, include: The battery according to any one of claims 1 to 10.

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