Battery

Abstract

The present invention provides a battery comprising a conductive case and a cover plate assembly surrounding a cavity. The conductive case or cover plate assembly is provided with a liquid injection hole communicating with the cavity, and a sealing member is provided at the liquid injection hole to seal the liquid injection hole. The sealing member is formed with a first weld seam having a first head end and a first end, and a second weld seam having a second head end and a second end, the first head end and the second end are connected, and the second head end and the first end are connected, and the sealing member is connected to the conductive case or cover plate assembly by the first weld seam and the second weld seam. That is, it is realized that the weld seam connected between the sealing member and the conductive top cover is a two-stage weld seam, and the first weld seam and the second weld seam can be welded by means of block welding with a predetermined time interval, so that the first weld seam can fully dissipate heat, the heat accumulation of the weld seam is reduced, yellowing and burst points are reduced or avoided, and the yield of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and particularly to batteries.

Background Art

[0002] A battery is a component that converts chemical energy into electrical energy and is widely applied in daily life and work. For example, button batteries are often used in various electronic devices such as electronic watches, Bluetooth earphones, and electric toys to provide power to the electronic devices. They occupy a very important position in people's life and work.

[0003] A button battery includes a conductive case and a cover plate assembly formed so as to surround a cavity in which an electrolyte is stored. A liquid injection hole is provided in the cover plate assembly or the conductive case, and the electrolyte is injected into the cavity via the liquid injection hole. A sealing member is welded to the liquid injection hole to seal the liquid injection hole. Generally, the sealing member is often welded to the cover plate assembly or the conductive case by one-time welding, and the welding joint is formed in one structure without stopping in the middle. The entire welding process from the head end to the tail end of the welding joint takes about 60 - 70 milliseconds. In this way, a continuous annular welding joint is formed on the sealing member. Therefore, in order to ensure the sealing performance, usually, the head end and the tail end of the formed welding joint are partially overlapped.

[0004] However, when the welding joint structure is formed in one time, the heat concentration becomes high, and the head end and the tail end of the welding joint are easily discolored. In severe cases, burst points occur, which affects the yield of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a battery to solve the problem in a conventional battery that when a welded joint structure is formed at one time, heat concentration becomes high, the head and the end of the welded joint are easily yellowed, and in severe cases, burst points are generated, affecting the yield of the battery.

Means for Solving the Problems

[0006] The present application provides a battery including a conductive case and a cover plate assembly provided to cover the conductive case. The cover plate assembly and the conductive case form a cavity, and a liquid injection hole communicating with the cavity is provided in the conductive case or the cover plate assembly. A sealing member for sealing the liquid injection hole is provided in the liquid injection hole. A first welded joint having a first head end and a first tail end and a second welded joint having a second head end and a second tail end are respectively formed in the sealing member. The first head end and the second tail end are connected, the second head end and the first tail end are connected, and the sealing member is connected to the conductive case or the cover plate assembly through the first welded joint and the second welded joint.

[0007] That is, it is realized that the welded joints connected between the sealing member and the conductive top cover are two-stage welded joints respectively formed with the head end and the tail end connected. In other words, when connecting the sealing member and the conductive top cover by welding, a two-stage welded joint is formed by using a block welding method for the sealing member and the conductive top cover. In actual welding operation, the formation of the first welded joint and the formation of the second welded joint can be performed at a predetermined time interval.

[0008] In this way, after sufficiently dissipating heat from the first weld seam, the second weld seam can be formed. As a result, heat accumulation is effectively reduced or avoided, and the heat of the weld seam is naturally reduced. When the head and the tail of the first weld seam and the second weld seam are connected, the occurrence of burst points at the connection part is effectively reduced or avoided, and the yield of the battery is effectively improved. At the same time, the heat received by the electrolyte can be alleviated, and the vaporization phenomenon of the electrolyte can be reduced or avoided. Thus, the yellowing of the head and the tail of the weld seam is effectively prevented, and the yield of the battery is further improved.

[0009] In one possible implementation, the cover plate assembly includes a conductive top cover and a cover plate. The cover plate is provided on the conductive case, and the conductive top cover is provided so as to be insulated from the cover plate. The liquid injection hole is located in the conductive top cover and penetrates through the conductive top cover.

[0010] In one possible implementation, the penetration depth of the welding of the first weld seam and the second weld seam is greater than the thickness of the sealing member and less than the sum of the thicknesses of the sealing member and the conductive case, or the penetration depth of the welding of the first weld seam and the second weld seam is greater than the thickness of the sealing member and less than the sum of the thicknesses of the sealing member and the conductive top cover.

[0011] In one possible implementation, both the first weld seam and the second weld seam are in an arc shape and are provided to be concentric with each other.

[0012] In one possible implementation, the first head and the second tail partially overlap, and / or the second head and the first tail partially overlap.

[0013] In one possible implementation, the sealing member includes a sealing part facing the liquid injection hole and a connecting part provided to surround the outer periphery of the sealing part. The connection part is thinner than the sealing part, and the first welding seam and the second welding seam are located in the connection part.

[0014] In one possible implementation, the overlapping portion between the first end and the second head end has a central angle within the range of 0° to 30°, and / or the overlapping portion between the second end and the first head end has a central angle within the range of 0° to 30°.

[0015] In one possible implementation, the central angle of the first welding seam is within the range of 180° to 240°, and / or the central angle of the second welding seam is within the range of 120° to 240°.

[0016] In one possible implementation, the first welding seam has an inner diameter in the range of 3.6 mm to 4 mm, and the first welding seam has an outer diameter in the range of 4 mm to 4.4 mm, and / or the second welding seam has an inner diameter in the range of 3.6 mm to 4 mm, and the second welding seam has an outer diameter in the range of 4 mm to 4.4 mm.

[0017] In one possible implementation, there is a first recess on the surface of the conductive top cover opposite to the conductive case, and the sealing member is located within the first recess.

[0018] In one possible implementation, the first welding seam and the second welding seam have a protrusion on the surface of the sealing member opposite to the conductive case, with the apex lower than the surface of the conductive top cover opposite to the conductive case.

[0019] In one possible implementation, there is a further second recess within the first recess, and the liquid injection hole is located within the second recess.

Brief Description of the Drawings

[0020] To more clearly explain the embodiments of the present application or the solutions of the prior art, the drawings that need to be used in the description of the embodiments or the prior art will be briefly described below. Naturally, the drawings described below are some embodiments of the present application, and those skilled in the art can conceive of other drawings based on these drawings without creative effort.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0021] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions will be clearly and completely described below with reference to the drawings related to the present application. Naturally, the described embodiments are only a part of the embodiments of the present application, not all of them. Those skilled in the art can obtain all other embodiments without creative labor based on the embodiments in the present application, and all of them belong to the protection scope of the present application.

[0022] FIG. 1 is a schematic diagram of the structure of a battery provided by an embodiment of the present application, and FIG. 2 is an exploded schematic diagram of the structure of a battery provided by an embodiment of the present application.

[0023] In the embodiments of the present application, the case where the battery is a button battery will be described as an example. As shown in FIG. 1, the battery 100 includes a conductive case 10 and a cover plate assembly 20 provided to cover the conductive case 10. The cover plate assembly 20 and the conductive case 10 form by surrounding a cavity 11. Specifically, as shown in FIG. 2, the cover plate assembly 20 can include a conductive top cover 21 and a cover plate 22. The cover plate 22 has an annular structure and can be provided to cover the conductive case 10.

[0024] The conductive top cover 21 is provided on the cover plate 22 and is connected to the cover plate 22 so as to be insulated therefrom. Specifically, for example, a first insulating member 40 can be provided between the conductive top cover 21 and the cover plate 22. The first insulating member 40 insulates and blocks the conductive top cover 21 from the cover plate 22 to prevent the conductive top cover 21 from being in electrical contact with the cover plate 22 and causing a short circuit of the battery 100, effectively improving the safety of the battery 100.

[0025] A cell 60 and an electrolytic solution (not shown) can be provided in the cavity 11 of the battery 100. The cell 60 can undergo a chemical reaction in the electrolytic solution to generate electrical energy. The cell 60 can include a positive electrode tab 61 that can be electrically connected to the conductive top cover 21 and a negative electrode tab (not shown) that can be electrically connected to the conductive case 10. In this way, the conductive top cover 21 becomes the positive electrode end of the battery 100, and the conductive case 10 becomes the negative electrode end of the battery 100.

[0026] Of course, in some examples, the positive electrode tab 61 can be electrically connected to the conductive case 10, and the negative electrode tab can be electrically connected to the conductive top cover 21, so that the conductive case 10 becomes the positive electrode end of the battery 100 and the conductive top cover 21 becomes the negative electrode end of the battery 100. In the embodiments of the present application, the case where the positive electrode tab 61 is electrically connected to the conductive top cover 21 and the negative electrode tab is electrically connected to the conductive case 10 will be described as an example.

[0027] A second insulating member 30 can be provided between the cell 60 and the cover plate 22. The second insulating member 30 can insulate and cut off the cell 60 and the positive tab 61 from the cover plate 22, so that the cell 60 or the positive tab 61 does not come into electrical contact with the cover plate 22. The short circuit of the battery 100 caused by the cell 60 or the positive tab 61 coming into electrical contact with the cover plate 22 is reduced or avoided, and the safety of the battery 100 is further improved.

[0028] The conductive case 10 or the cover plate assembly 20 is provided with a liquid injection hole 23. That is, the liquid injection hole 23 may be provided in the conductive case 10, or the liquid injection hole 23 may be provided in the cover plate assembly 20. The liquid injection hole 23 communicates with the cavity 11 of the battery 100, and the electrolyte can be injected into the cavity 11 through the liquid injection hole 23. A sealing member 50 for sealing the liquid injection hole 23 to prevent leakage of the electrolyte is provided in the liquid injection hole 23.

[0029] Since the sealing member 50 is used to seal the liquid injection hole 23, the arrangement position of the sealing member 50 is associated with the arrangement position of the liquid injection hole 23. That is, when the liquid injection hole 23 is provided in the cover plate assembly 20, the sealing member 50 can be provided in the cover plate assembly 20, and when the liquid injection hole 23 is provided in the conductive case 10, the sealing member 50 can be provided in the conductive case 10.

[0030] The sealing member is usually provided so as to be welded to the conductive case or the cover plate assembly. For example, in the related art, the sealing member is connected to the conductive top cover by a continuous annular weld seam. Generally, the weld seam is formed by adopting a single welding means, that is, the structure of the weld seam is formed at one time without stopping in the middle. Usually, the entire welding process takes only 60 to 70 milliseconds from start to end. In order to ensure the sealing performance, the head and the end of the weld seam may be connected, or even partially overlapped.

[0031] However, when the welded joint is formed once with a structure within an extremely short time, the heat concentration is high, the electrolyte in the battery case is liable to be heated and vaporized, and the positions of the head and the end of the welded joint tend to turn yellow. At the same time, the head and the end of the welded joint are connected or overlapped, and since the welded joint is formed within a short time, the heat dissipation time of the head is short, and the head is connected to or overlapped with the end without being effectively dissipated, so that burst points are likely to occur at the part where the head and the end of the welded joint are connected or overlapped, which seriously affects the yield of the battery.

[0032] In view of the above problems, the embodiment of the present application provides a battery that can effectively reduce the heat concentration in the welded joint, reduce or avoid the yellowing of the head and the end of the welded joint or the occurrence of burst points, and effectively improve the yield of the battery.

[0033] FIG. 3 is an enlarged view of region A in FIG. 1, and FIG. 4 is a top view of the battery provided by the embodiment of the present application.

[0034] As shown in FIGS. 3 and 4, in the embodiment of the present application, a first welded joint 70 and a second welded joint 80 that can be formed by laser welding are respectively formed on the sealing member 50. The first welded joint 70 has a first head 71 and a first end 72, and the second welded joint 80 has a second head 81 and a second end 82. The first head 71 and the second end 82 are connected, and the second head 81 and the first end 72 are connected, that is, the head and the end of the first welded joint 70 and the second welded joint 80 are sequentially connected, and the first welded joint 70 and the second welded joint 80 are joined together to form a closed welded joint.

[0035] Both the first welded joint 70 and the second welded joint 80 extend from the sealing member 50 to the conductive case 10 or the cover plate assembly 20. That is, by making the penetration depth of the first welded joint 70 and the second welded joint 80 greater than the thickness of the sealing member 50, the sealing member 50 can be connected to the conductive case 10 or the cover plate assembly 20 by the first welded joint 70 and the second welded joint 80.

[0036] That is, the welding seam connected between the sealing member 50 and the conductive top cover 21 or the conductive case 10 is a two-stage welding seam, and it is realized that the two-stage welding seams are respectively formed and the head end and the tail end are connected. In other words, when welding and connecting the sealing member 50 to the conductive top cover 21, a two-stage welding seam is formed between the sealing member 50 and the conductive top cover 21 by using the means of block welding. In this way, in the actual welding operation, the formation of the first welding seam 70 and the formation of the second welding seam 80 can be carried out at intervals of a predetermined time.

[0037] For example, first, the first welding seam 70 is formed. After the formation of the first welding seam 70 is completed, in order to effectively dissipate heat and cool the first welding seam 70, the formation of the second welding seam 80 can be advanced at intervals of a predetermined time. In this way, the heat concentration of the welding seam is effectively reduced. That is, the heat of the welding seam, especially the heat between the first head end 71 and the first tail end 72 of the first welding seam 70, is reduced. When the first welding seam 70 and the second welding seam 80 are connected or overlapped at the head end and the tail end, the occurrence of burst points at the connection site is effectively reduced or avoided, and the yield of the battery 100 is effectively improved. At the same time, the heat received by the electrolyte can be alleviated, and the vaporization phenomenon of the electrolyte can be reduced or avoided. Thereby, the yellowing of the head end and the tail end of the welding seam is effectively prevented, and the yield of the battery 100 is further improved.

[0038] In the embodiment of the present application, when the liquid injection hole 23 is provided in the cover plate assembly 20, the liquid injection hole 23 may be located in the conductive top cover 21 and may be provided so as to penetrate the conductive top cover 21. In some examples, the conductive top cover 21 may be provided at the bottom of the conductive case 10, or the conductive top cover 21 may be provided on the side wall of the conductive case 10. That is, when the liquid injection hole 23 is provided in the conductive top cover 21, the liquid injection hole 23 can change its arrangement position according to the arrangement position of the conductive top cover 21 in the conductive case 10.

[0039] In addition, when the liquid injection hole 23 is provided in the conductive case 10, the liquid injection hole 23 may be provided in the bottom wall of the conductive case 10, or the liquid injection hole 23 may be provided in the side wall of the conductive case 10, or the liquid injection hole 23 may be provided in the top of the conductive case 10. Specifically, the arrangement position of the liquid injection hole 23 can be selected and set according to the structural design of the battery 100 and the specific application scenarios.

[0040] In the embodiment of the present application, the liquid injection hole 23 is provided in the conductive top cover 21. That is, when the sealing member 50 is welded to the conductive top cover 21, the penetration depth of the first weld seam 70 and the second weld seam 80 can be made greater than the thickness of the sealing member 50 and less than the sum of the thicknesses of the sealing member 50 and the conductive top cover 21. In this way, while realizing the connection between the sealing member 50 and the conductive top cover 21 by the first weld seam 70 and the second weld seam 80, it is possible to prevent the weld seam from penetrating the conductive top cover 21 and appearing on the surface facing the cavity 11 of the conductive top cover 21, and avoid the weld seam appearing on the surface facing the cavity 11 of the conductive top cover 21 and affecting the electrical connection between the conductive top cover 21 and the tab (for example, the positive tab 61). As a result, the reliability and stability of the electrical connection between the tab and the conductive top cover 21 are effectively improved.

[0041] Accordingly, when the liquid injection hole 23 is provided in the conductive case 10, that is, when the sealing member 50 is welded to the conductive case 10, the penetration depth of the first weld seam 70 and the second weld seam 80 can be made greater than the thickness of the sealing member 50 and less than the sum of the thicknesses of the sealing member 50 and the conductive case 10. In this way, it is possible to avoid the weld seam penetrating the conductive case 10 and affecting the electrical connection between the conductive case 10 and the tab, and effectively improve the reliability and stability of the electrical connection between the conductive case 10 and the tab.

[0042] For example, taking the case where the liquid injection hole 23 is provided in the conductive top cover 21, that is, when the sealing member 50 is welded to the conductive top cover 21 as an example, the first weld seam 70 and the second weld seam 80 can have a depth extending in the conductive top cover 21 of a value of 0.05 mm to 0.2 mm. In this way, the reliability and firmness of the connection between the sealing member 50 and the conductive top cover 21 can be effectively ensured, and at the same time, it is also possible to effectively prevent the weld seam from penetrating through the conductive top cover 21.

[0043] Hereinafter, taking the case where the liquid injection hole 23 is provided in the conductive top cover 21, that is, when the sealing member 50 is provided in the conductive top cover 21 as an example, the first weld seam 70 and the second weld seam 80 provided according to the embodiments of the present application will be described in detail.

[0044] In the embodiments of the present application, continuing to refer to FIG. 3, both the first weld seam 70 and the second weld seam 80 can be provided in an arc shape and be concentric with each other. In this way, the first weld seam 70 and the second weld seam 80 can be better connected, the connection between the first head end 71 and the second end 82 and the connection between the second head end 81 and the first end 72 are effectively improved in terms of sealing performance and reliability, the connection between the sealing member 50 and the conductive top cover 21 is improved in terms of sealing performance. As a result, the sealing effect of the sealing member 50 on the liquid injection hole 23 is effectively improved, and the performance of the battery 100 is further improved.

[0045] It can be partially overlapped between the first head end 71 and the second tail end 82, and / or can be partially overlapped between the second head end 81 and the first tail end 72. It may be partially overlapped only between the first head end 71 and the second tail end 82, and in this way, the sealing performance of the connection between the first head end 71 and the second tail end 82 can be further improved. Or, it may be partially overlapped only between the second head end 81 and the first tail end 72, and in this way, the sealing performance of the connection between the second head end 81 and the first tail end 72 can be further improved. Or, it may be partially overlapped only between the first head end 71 and the second tail end 82 and also partially overlapped between the second head end 81 and the first tail end 72, and in this way, the sealing performance of the connection between the first head end 71 and the second tail end 82 and the sealing performance of the connection between the second head end 81 and the first tail end 72 can be improved simultaneously. That is, the sealing performance of the connection between the first weld seam 70 and the second weld seam 80 is further improved, thereby effectively improving the sealing performance of the connection between the sealing member 50 and the conductive top cover 21, and the performance of the battery 100 is improved.

[0046] Specifically, the central angle of the overlapping part between the first tail end 72 and the second head end 81 is in the range of 0° to 30° in terms of the angle value, and / or the central angle of the overlapping part between the second tail end 82 and the first head end 71 is in the range of 0° to 30° in terms of the angle value. Only the central angle of the overlapping part between the first tail end 72 and the second head end 81 may be in the range of 0° to 30° in terms of the angle value, or only the central angle of the overlapping part between the second tail end 82 and the first head end 71 may be in the range of 0° to 30° in terms of the angle value, or the central angles of the overlapping parts between the first tail end 72 and the second head end 81 and between the second tail end 82 and the first head end 71 may both be in the range of 0° to 30°. In this way, the overlapping area between the first tail end 72 and the second head end 81 and between the second tail end 82 and the first head end 71 can be effectively ensured, whereby the sealing performance of the connection between the head end and the tail end of the first weld seam 70 and the second weld seam 80 is further improved, and the sealing performance with respect to the liquid injection hole 23 of the sealing member 50 is improved.

[0047] Meanwhile, it is possible to reduce or avoid the heat rise caused by the overlapping part of the head and the end of the first weld seam 70 and the second weld seam 80 being too large. As a result, it is effectively prevented that yellowing and burst points occur at the part where the head and the end of the first weld seam 70 and the second weld seam 80 overlap, and the performance of the battery 100 is further improved.

[0048] In the embodiment of the present application, the central angle of the first weld seam 70 may be in the range of 180° to 240° in terms of the angle value, and / or the central angle of the second weld seam 80 may be in the range of 120° to 240° in terms of the angle value. The central angle of the first weld seam 70 is in the range of 180° to 240° in terms of the angle value, and the head and the end of the second weld seam 80 may be connected to the head and the end of the first weld seam 70. Or, the central angle of the second weld seam 80 is in the range of 120° to 240° in terms of the angle value, and the first weld seam 70 may be connected to the head and the end of the second weld seam 80. Or, the central angle of the first weld seam 70 is in the range of 180° to 240° in terms of the angle value, and the central angle of the second weld seam 80 is in the range of 120° to 240° in terms of the angle value. In this way, neither the first weld seam 70 nor the second weld seam 80 is too long, or one of the first weld seam 70 and the second weld seam 80 is not too long. It is possible to reduce or avoid the heat rise caused by the first weld seam 70 and / or the second weld seam 80 being too long. As a result, the occurrence of yellowing and burst points at the part where the head and the end of the first weld seam 70 and the second weld seam 80 are connected or overlapped is further reduced or avoided.

[0049] Here, the inner diameter of the first weld seam 70 can be in the range of 3.6 mm to 4 mm, the outer diameter of the first weld seam 70 can be in the range of 4 mm to 4.4 mm, and / or the inner diameter of the second weld seam 80 can be in the range of 3.6 mm to 4 mm. Second weld joint 80It can be made such that the outer diameter is in the range of 4 mm to 4.4 mm. Only the first weld seam 70 may have an inner diameter in the range of 3.6 mm to 4 mm and an outer diameter in the range of 4 mm to 4.4 mm, or only the second weld seam 80 may have an inner diameter in the range of 3.6 mm to 4 mm and an outer diameter in the range of 4 mm to 4.4 mm, or both the first weld seam 70 and the second weld seam 80 may have an inner diameter in the range of 3.6 mm to 4 mm and an outer diameter in the range of 4 mm to 4.4 mm. By making the first weld seam 70 and the second weld seam 80 be within the range of the said dimensions, the sealing member 50 and the conductive top cover 21 can be connected more strongly, tack welding is reduced or avoided, the connection between the conductive top cover 21 and the sealing member 50 is effectively improved in reliability and strength, and the performance of the battery 100 is further improved.

[0050] FIG. 5 is a schematic structural view of a conductive top cover provided according to an embodiment of the present application.

[0051] In the embodiment of the present application, as shown in FIG. 5, a first recess 211 can be provided on the side opposite to the cover plate 22 of the conductive top cover 21. When the sealing member 50 is provided on the conductive top cover 21, it may be provided within the first recess 211. When the sealing member 50 is provided within the first recess 211, the space occupied by the sealing member 50 becomes smaller, and an increase in the thickness of the battery 100 due to the provision of the sealing member 50 is reduced or avoided, which is advantageous for the thin and light design of the battery 100. At the same time, it is also advantageous for the weight reduction of the battery 100.

[0052] The first recess 211 can have a circular shape, and the first recess 211 can have a depth of 0.25 mm and a diameter of 4.6 mm. In this way, further weight reduction of the battery 100 can be achieved. At the same time, the sealing member 50 can be better provided within the first recess 211, and the influence of the sealing member 50 on the overall thickness of the battery 100 is effectively reduced or avoided.

[0053] When the first welding joint 70 and the second welding joint 80 are formed on the sealing member 50, the first welding joint 70 and the second welding joint 80 form protrusions on the surface of the sealing member 50 opposite to the conductive case 10, and the height of the vertices can be made lower than the surface of the conductive top cover 21 opposite to the conductive case 10. That is, the first welding joint 70 and the second welding joint 80 are located within the first recess 211 and do not protrude outside the first recess 211. In this way, the influence on the overall thickness of the battery 100 by the first welding joint 70 and the second welding joint 80 is reduced or avoided, and it is prevented that the protrusions of the first welding joint 70 and the second welding joint 80 are too thick and the overall battery 100 becomes larger in size, which is advantageous for the lightweight design of the battery 100.

[0054] A second recess 212 can be further provided within the first recess 211, and the liquid injection hole 23 can be provided within the second recess 212. In this way, when injecting the electrolyte, the spilled electrolyte can be restricted within the second recess 212, and the spilling of the electrolyte into the first recess 211 is reduced or avoided. It is prevented that the normal welding of the sealing member 50 is affected due to the spilling of the electrolyte into the first recess 211, and the welding reliability and stability of the sealing member 50 are further improved.

[0055] FIG. 6 is a schematic structural diagram of a sealing member provided according to an embodiment of the present application, FIG. 7 is a schematic structural diagram of another sealing member provided according to an embodiment of the present application, and FIG. 8 is a schematic diagram when the first welding joint and the second welding joint provided according to an embodiment of the present application are provided on another sealing member.

[0056] As shown in FIG. 6, the sealing member 50 has a flat plate-like structure, that is, the sealing member 50 can have a substantially uniform thickness. In this way, the structure of the sealing member 50 can be simplified, whereby the design cost and processing cost of the sealing member 50 are reduced, and the economic effect is enhanced.

[0057] The sealing member 50 can have a diameter of 4.4 mm. In this way, the sealing member 50 can completely cover the liquid injection hole 23, and the sealing performance of the sealing member 50 with respect to the liquid injection hole 23 is improved. Also, the sealing member 50 can have a thickness of 0.15 mm. In this way, the structural strength of the sealing member 50 can be effectively improved, whereby the connection between the sealing member 50 and the conductive top cover 21 is improved in reliability and firmness, and the sealing performance of the sealing member 50 with respect to the liquid injection hole 23 is further improved.

[0058] Alternatively, the sealing member 50 can also have the shape of other structures. For example, as shown in FIG. 7, the sealing member 50 can include a sealing portion 51 and a connection portion 52 provided so as to surround the outer periphery of the sealing portion 51. When the sealing member 50 is provided on the conductive top cover 21, the sealing portion 51 may be provided so as to face the liquid injection hole 23. The connection portion 52 has a smaller thickness than the sealing portion 51. That is, the sealing member 50 is composed of the connection portion 52 and the sealing portion 51 protruding from the connection portion 52, and the connection portion 52 can be made thin. Specifically, the connection portion 52 of the sealing member 50 can have a thickness of less than 0.15 mm, and the sealing portion 51 can have a thickness of 0.15 mm or more.

[0059] As shown in FIG. 8, when the sealing member 50 is connected to the conductive top cover 21 by welding, the first weld seam 70 and the second weld seam 80 can be located at the connection portion 52. Since the connection portion 52 is made thin and its thickness is relatively small, when the first weld seam 70 and the second weld seam 80 are formed at the connection portion 52, the first weld seam 70 and the second weld seam 80 can be formed with small welding energy to achieve welding, further reducing the heat of the first weld seam 70 and the second weld seam 80, and reducing the concentration of the heat of the weld seam. Thereby, the occurrence of yellowing and burst points at the portion where the heads and ends of the first weld seam 70 and the second weld seam 80 overlap is effectively reduced or avoided, and the performance of the battery 100 is effectively improved.

[0060] The sealing portion 51 can also have a thickness of 0.25 mm. In this way, the sealing portion 51 becomes thicker, and the height difference between the sealing portion 51 and the conductive top cover 21 can be reduced. If a relay tab or other structure is provided on the sealing portion 51, it can be operated more easily. Also, the connecting portion 52 can have a thickness of 0.1 mm. In this way, the welding energy between the sealing member 50 and the conductive top cover 21 can be reduced, and the heat of the weld joint can be lowered.

[0061] Note that the numerical values and numerical ranges according to the embodiments of the present application are approximate values, and due to the influence of the manufacturing process, there may be errors within a range that can be ignored by those skilled in the art.

[0062] Hereinafter, the battery forming method provided by the embodiments of the present application will be described in detail. The above battery forming method can include the following processes.

[0063] First, complete the assembly of components such as the conductive case 10, the cell 60, the cover plate 22, and the conductive top cover 21. After the assembly of the above components is completed, inject the electrolytic solution into the cavity 11 through the liquid injection hole 23, and then the sealing member 50 can be placed on the conductive top cover 21.

[0064] The placement of the sealing member 50 can be achieved by an automated device. For example, the placement of the sealing member 50 can be achieved using a robot hand. Specifically, a suction cup can be provided on the robot hand, and the sealing member 50 can be sucked by the suction cup and placed in the first recess 211 in the conductive top cover 21.

[0065] Also, before placing the sealing member 50, in order to ensure the accuracy of the placement position, first, photograph the conductive top cover 21 using a detection element such as a CCD (Charge-coupled Device) to determine its position, and then the sealing member 50 may be placed on the conductive top cover 21.

[0066] Next, after the sealing member 50 has been left to stand, it is possible to start forming the first weld seam 70 on the sealing member 50 and allowing it to cool for a predetermined time. Specifically, for example, using a welding machine such as a laser welding machine, the first weld seam 70 is formed at the connection portion 52 of the sealing member 50, and after the formation of the first weld seam 70 is completed, a predetermined time is waited so that the first weld seam 70 can cool down sufficiently for air cooling, that is, the laser welding is stopped.

[0067] Specifically, the predetermined time can be set to 0.5 s to 2 s. In this way, the first weld seam 70 can dissipate heat and cool down sufficiently for air cooling, and as a result, the occurrence of yellowing and burst points at the head and end of the first weld seam 70 and the second weld seam 80 is further reduced, and the yield of the battery 100 is further improved.

[0068] Before forming the first weld seam, several weld points may be formed on the sealing member 50. That is, after the sealing member 50 is placed in the first recess 211, first, using a welding machine, several predetermined weld points are formed at the connection portion 52 of the sealing member 50, and the sealing member 50 can be initially positioned. When the predetermined weld points are formed, the robot hand and the suction cup are removed, and the first weld seam 70 can be formed using a welding machine.

[0069] Finally, stopping waiting for the predetermined time, the second weld seam 80 is formed on the sealing member 50 again by laser welding. When the second head 81 of the second weld seam 80 is connected to the first end 72 of the first weld seam 70 and the second end 82 of the second weld seam 80 is connected to the first head 71 of the first weld seam 70, the first weld seam 70 and the second weld seam 80 are sequentially connected at the head and end to form a closed weld seam, so that the sealing member 50 is provided to be welded to the conductive top cover 21 by the first weld seam 70 and the second weld seam 80, and the above-described battery 100 is formed.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "vertical direction", "horizontal direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for the purpose of facilitating the description and simplification of the present disclosure, and does not explicitly or implicitly indicate that the shown device or element must have a specific orientation, be configured and operate in a specific orientation, so it cannot be understood as limiting the present disclosure.

[0071] In the description of the present invention, it should be understood that the terms "comprising" and "having" used herein, and all their variations, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units need not be limited to the explicitly listed steps or units, and may include other steps or units not explicitly listed or inherent to these processes, methods, products or devices.

[0072] Unless otherwise specified, the terms "attach", "connect", "couple", "fix" should be understood in a broad sense. For example, they may be fixedly connected, removably connected, or integrated, may be directly connected or indirectly connected through an intermediate medium, or may be the communication within two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to specific situations. Also, terms such as "first", "second", etc. are used only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features.

[0073] Finally, it should be noted that the above embodiments are for explaining the technical solutions of the present invention and are not intended to limit it. Although the present invention will be described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments, or perform equivalent substitutions for some or all of the technical features therein. It should be understood that these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

[0074] This application claims the priority of a Chinese patent application with an application number of 202111553172.8 and an invention title of "Battery", which was filed with the Chinese Patent Office on December 17, 2021, and all its contents are incorporated herein by reference.

Description of Reference Numerals

[0075] 100 Battery 10 Conductive Case 11 Cavity 20 Cover Plate Assembly 21 Conductive Top Cover 211 First Recess 212 Second Recess 22 Cover Plate 23 Liquid Injection Hole 30 Second Insulating Member 40 First Insulating Member 50 Sealing Member 51 Sealing Portion 52 Connection Portion 60 Cell 61 Positive Electrode Tab 70 First Weld Seam 71 First Head End 72 First Tail End 80 Second Weld Seam 81 Second Head End 82 Second Tail End

Claims

1. A conductive case (10) and a cover plate assembly (20) provided to cover the conductive case (10), wherein the cover plate assembly (20) and the conductive case (10) form a cavity (11) therearound, and a liquid injection hole (23) communicating with the cavity (11) is provided in the cover plate assembly (20) or the conductive case (10), and a sealing member (50) for sealing the liquid injection hole (23) is provided in the liquid injection hole (23). The sealing member (50) is formed with a first weld seam (70) having a first head end (71) and a first tail end (72), and a second weld seam (80) having a second head end (81) and a second tail end (82), respectively. The first head end (71) and the second tail end (82) are connected, and the second head end (81) and the first tail end (72) are connected. The sealing member (50) is connected to the conductive case (10) or the cover plate assembly (20) by the first weld seam (70) and the second weld seam (80). The sealing member (50) includes a sealing portion (51) and a connecting portion (52) provided so as to surround the outer periphery of the sealing portion (51). The connecting portion (52) has a smaller thickness than the sealing portion (51), and the sealing portion (51) protrudes from the connecting portion (52) on the side opposite to the liquid injection hole (23), and the sealing portion (51) faces the liquid injection hole (23). The first weld seam (70) and the second weld seam (80) are formed with protrusions on the surface of the sealing member (50) opposite to the conductive case (10), and the first weld seam (70) and the second weld seam (80) are located in the connecting portion (52). A method for manufacturing a battery, The method for manufacturing a battery includes a step of forming the first weld seam (70) and the second weld seam (80) on the sealing member (50) at intervals of a predetermined time, respectively.

2. The cover plate assembly (20) includes a cover plate (22) provided on the conductive case (10) and a conductive top cover (21) provided so as to be insulated from the cover plate (22). The liquid injection hole (23) is located in the conductive top cover (21), and the liquid injection hole (23) penetrates the conductive top cover (21). The method for manufacturing a battery according to claim 1, characterized in that.

3. The first weld joint (70) and the second weld joint (80) are such that the penetration depth of the weld is greater than the thickness of the sealing member (50) and less than the sum of the thicknesses of the sealing member (50) and the conductive case (10). Or, the first weld joint (70) and the second weld joint (80) are such that the penetration depth of the weld is greater than the thickness of the sealing member (50) and less than the sum of the thicknesses of the sealing member (50) and the conductive top cover (21). The method for manufacturing a battery according to claim 2 is characterized by this.

4. Both the first weld joint (70) and the second weld joint (80) are in an arc shape and are provided concentrically with each other. The method for manufacturing a battery according to any one of claims 1 to 3 is characterized by this.

5. The first head end (71) and the second tail end (82) partially overlap, and / or the second head end (81) and the first tail end (72) partially overlap. The method for manufacturing a battery according to claim 4 is characterized by this.

6. The overlapping portion of the first tail end (72) and the second head end (81) has a central angle within a range of 0° to 30°. And / or the overlapping portion of the second tail end (82) and the first head end (71) has a central angle within a range of 0° to 30°. The method for manufacturing a battery according to claim 4 is characterized by this.

7. The central angle of the first weld joint (70) is within a range of 180° to 240° in terms of the angle value, and / or the central angle of the second weld joint (80) is within a range of 120° to 240° in terms of the angle value. The method for manufacturing a battery according to claim 4 is characterized by this.

8. The first weld joint (70) has an inner diameter in the range of 3.6 mm to 4 mm, and the first weld joint (70) has an outer diameter in the range of 4 mm to 4.4 mm. And / or the second weld joint (80) has an inner diameter in the range of 3.6 mm to 4 mm, and the second weld joint (80) has an outer diameter in the range of 4 mm to 4.4 mm. The method for manufacturing a battery according to claim 4 is characterized by this.

9. There is a first recess (211) on the surface of the conductive top cover (21) opposite to the conductive case (10), and the sealing member (50) is located within the first recess (211). The method for manufacturing a battery according to claim 2 is characterized by this.

10. The first weld joint (70) and the second weld joint (80) have protrusions whose vertices are lower than the surface of the conductive top cover (21) opposite to the conductive case (10) on the surface of the sealing member (50) opposite to the conductive case (10). The method for manufacturing a battery according to claim 9, characterized in that.

11. There is a second recess (212) further in the first recess (211), and the liquid injection hole (23) is located in the second recess (212). The method for manufacturing a battery according to claim 9, characterized in that.

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