Welding structure of pole and connecting piece, top cover assembly and battery pack

Abstract

The utility model provides a welding structure of a pole and a connecting piece, a top cover assembly and a battery pack, and relates to the technical field of batteries, the welding structure of the pole and the connecting piece comprises the pole and the connecting piece, a first through hole penetrating through the connecting piece is formed in the connecting piece; one end of the pole penetrates through the first through hole and protrudes out of the connecting piece; the pole comprises a main body part, a welding part and a protruding part which are sequentially arranged along a first direction; the body part and the protruding part are located on the two opposite sides of the connecting piece respectively, and the welding part is located in the first through hole. The outer side wall of the welding part is in welded connection with the inner side wall of the first through hole; solder is arranged on the outer side wall of the protruding part, and the connecting piece and the protruding part are connected in a welded mode through the solder. According to the welding structure of the pole and the connecting piece, provided by the utility model, the welding part and the protruding part in the pole can be simultaneously welded and connected with the connecting piece, so that higher welding tension can be provided, the welding stability between the pole and the connecting piece is further improved, and the reliability of the internal structure of a battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a welding structure of a pole and a connecting piece, a top cover assembly and a battery pack. Background Art

[0002] The main types of active implantable neurostimulators include vagus nerve stimulator (VNS), deep brain nerve stimulator (DBS), spinal nerve stimulator (SCS), sacral nerve stimulator (SNS), etc. As the core power component, the battery of active implantable neurostimulators occupies a relatively important position. Due to the small size of the battery, in order to reduce space constraints and achieve electrical connection between the pole and the pole ear, a connecting plate structure is usually added to connect the pole and the pole ear to different positions of the connecting plate.

[0003] In the related art, the pole and the connecting piece are usually connected by resistance welding. The pole and the connecting piece are usually a stacked welding structure. Due to the small size of the pole and the connecting piece, welding is difficult and there is a risk of cold welding, which can easily cause battery circuit abnormalities. Utility Model Content

[0004] The embodiments of the utility model provide a welding structure of a pole and a connecting piece, a top cover assembly and a battery pack, which facilitate the welding between the pole and the connecting piece, improve the welding strength between the pole and the connecting piece, and enhance the reliability of the internal structure of the battery.

[0005] In a first aspect, an embodiment of the present utility model provides a welding structure of a pole and a connecting piece, comprising a pole and a connecting piece;

[0006] The connecting sheet is provided with a first through hole penetrating the connecting sheet;

[0007] One end of the pole passes through the first through hole and protrudes from the connecting piece; the pole comprises a main body, a welding portion and a protruding portion arranged in sequence along a first direction;

[0008] The main body and the protruding portion are respectively located on opposite sides of the connecting piece, and the welding portion is located in the first through hole;

[0009] The outer wall of the welding portion is welded to the inner wall of the first through hole;

[0010] The outer side wall of the protrusion is provided with solder, and the connection piece and the protrusion are connected by welding through the solder.

[0011] In some embodiments, the length of the protrusion along the first direction is 0.2-0.5 mm.

[0012] In some embodiments, a distance that the solder protrudes from the connecting piece in the first direction is less than or equal to a length of the protruding portion in the first direction.

[0013] In some embodiments, the welding portion is loosely matched with the first through hole on the connecting sheet, and a welding seam is formed between the outer side wall of the welding portion and the inner side wall of the first through hole.

[0014] In some embodiments, the width of the weld is 0.02-0.03 mm.

[0015] In some embodiments, the connecting piece includes a first connecting portion, a bending portion, and a second connecting portion;

[0016] The first connecting portion is connected to the second connecting portion through the bending portion;

[0017] The first through hole is disposed on the first connecting portion, and the second connecting portion is connected to the tab.

[0018] In some embodiments, the pole is a positive pole, the positive pole is cylindrical, and the first through hole is a circular through hole.

[0019] In a second aspect, the utility model provides a top cover assembly, including the welding structure of the pole and the connecting piece as described above, an upper cover plate and a first insulating member;

[0020] The welding structure of the pole and the connecting piece comprises a pole and a connecting piece;

[0021] The upper cover plate, the first insulating member and the connecting piece are arranged in sequence;

[0022] The upper cover plate is provided with a passage for the pole to pass through, the insulating member is provided with a second through hole, and the pole passes through the upper cover plate and the second through hole in sequence to be connected to the connecting piece.

[0023] In some embodiments, the length of the pole between the connecting piece and the first insulating member is greater than or equal to 0.5 mm.

[0024] In a third aspect, the utility model provides a battery pack, comprising the top cover assembly as described above.

[0025] Beneficial effects of the embodiments of the utility model:

[0026] In an embodiment of the utility model, a welding structure of a pole and a connecting piece is provided, a first through hole is provided on the connecting piece, one end of the pole passes through the first through hole and continues to protrude outward, the pole comprises a main body portion, a welding portion and a protruding portion arranged in sequence along a first direction, wherein the main body portion and the protruding portion are respectively located on opposite sides of the connecting piece, and the welding portion is arranged in the first through hole, on the one hand, the outer side wall of the welding portion is welded to the inner side wall of the first through hole, on the other hand, solder is also provided on the outer side wall of the protruding portion, and the connecting piece and the protruding portion are welded and connected by the above-mentioned solder. The welding structure of the pole and the connecting piece provided by the utility model is suitable for welding by laser welding. The connecting piece is welded to the first through hole through the welding portion of the pole, and the protrusion and the connecting piece are welded to each other through the solder arranged on the outer circumference of the protrusion, which can improve the convenience of welding. The welding between the pole and the connecting piece through the protrusion can provide a higher welding tensile force, thereby improving the welding stability between the pole and the connecting piece, reducing the risk of short circuit caused by the pole falling off, and improving the reliability of the internal structure of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a cross-sectional view of a partial structure of a top cover assembly provided by an embodiment of the utility model;

[0029] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0030] Figure 3 It is a three-dimensional structural diagram of a connecting piece provided in an embodiment of the utility model;

[0031] Figure 4 It is an exploded structural diagram of a battery pack provided in an embodiment of the utility model;

[0032] Figure 5 It is a cross-sectional view of a battery pack provided in an embodiment of the present utility model.

[0033] Description of reference numerals:

[0034] 1. Pole; 11. Main body; 12. Welding part; 13. Protrusion; 14. Solder; 2. Connecting piece; 21; First connecting part; 211. First through hole; 22. Bending part; 23. Second connecting part; 3. Tab; 4. First insulating member; 5. Upper cover; 6. Second insulating member; 7. Battery cell; 8. Shell; 9. Lower cover; 100. Top cover assembly; 200. Battery pack. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] In a first aspect, an embodiment of the utility model provides a welding structure of a pole and a connecting piece, comprising a pole 1 and a connecting piece 2;

[0037] The connecting sheet 2 is provided with a first through hole 211 penetrating the connecting sheet 2;

[0038] One end of the pole 1 passes through the first through hole 211 and protrudes from the connecting piece 2; the pole comprises a main body 11, a welding portion 12 and a protruding portion 13 arranged in sequence in a first direction X;

[0039] The main body portion 11 and the protruding portion 13 are respectively located at two opposite sides of the connecting piece 2, and the welding portion 12 is located in the first through hole 211;

[0040] The outer wall of the welding portion 12 is welded to the inner wall of the first through hole 211;

[0041] The outer side wall of the protrusion 13 is provided with solder 14 , and the connection piece 2 and the protrusion 13 are connected by welding through the solder 14 .

[0042] like Figure 1 and Figure 2 In the partial structure of the top cover assembly 100 shown, there is a welding structure of the pole and the connecting piece provided by the embodiment of the utility model, and the connecting piece 2 is used to electrically connect the pole 1 and the pole ear 3, so as to ensure the normal operation of the battery pack 200; Figure 1-3 As shown, the pole 1 is connected to the connecting piece 2 through a first through hole 211 provided on the connecting piece 2, and one end of the pole 1 passes through the first through hole 211. The pole 1 is divided into a main body 11, a welding part 12 and a protruding part 13 which are sequentially arranged along the first direction X. The main body 11 and the protruding part 13 are respectively located on opposite sides of the connecting piece 2, and the welding part 12 is located in the first through hole 211. On the one hand, the outer wall of the welding part 12 is welded to the inner wall of the first through hole 211, and on the other hand, the outer wall of the protruding part 13 is provided with a solder 14, and the connecting piece 2 and the protruding part 13 are also welded to each other through the solder 14. That is, the pole 1 is welded to the connecting piece 2 through the welding part 12 and the protruding part 13 at the same time.

[0043] Specifically, Figure 1 and Figure 2 As shown, the solder 14 is located on the outer wall of the protrusion 13. The solder 14 is welded to the outer wall of the protrusion 13 on one hand, and to one side of the connecting piece 2 in the positive direction of the first direction X on the other hand, so that the protrusion 13 and the connecting piece 2 are welded together by the solder 14.

[0044] Generally speaking, in order to ensure good electrical connection and welding strength, different materials are used for the pole 1 and the connecting piece 2. For example, the pole 1 can be made of Kovar alloy 4J28, 4J29, molybdenum, titanium and other materials, among which molybdenum and titanium materials are more widely used due to their non-magnetic and strong corrosion resistance; the material of the connecting piece 2 is mostly pure aluminum, and stainless steel, low carbon steel, titanium, molybdenum and molybdenum alloy and other materials can also be selected.

[0045] At present, resistance welding is generally used for welding two structures made of different materials. The pole 1 and the connecting piece 2 are stacked and then resistance welded. However, there is a certain degree of welding difficulty in resistance welding for the pole 1 and the connecting piece 2 with smaller sizes, and there is a certain risk of cold welding after resistance welding, which can easily lead to abnormal circuit breaking and affect the stability of the battery pack 200. In addition, the pole 1 and the connecting piece 2 can also be welded by splicing (the welding areas of the two structures are flush), and for the splicing welding method, the welding tension of the pole 1 and the connecting piece 2 is small after welding, and the pole 1 is easy to fall off and cause a circuit break, thereby making the reliability of the internal structure of the battery pack 200 poor.

[0046] In the embodiment of the utility model, the welding structure of the pole and the connecting piece is used so that one end of the pole 1 protrudes from the connecting piece 2 to form a protrusion 13. In addition to being welded to the first through hole 211 on the connecting piece 2 through the welding portion 12, the pole 1 and the connecting piece 2 are welded by the solder 14 arranged on the outer wall of the protrusion 13. The two can be welded by laser welding, which reduces the welding difficulty. After welding, higher welding tension can be provided, thereby improving the welding stability between the pole 1 and the connecting piece 2, improving the reliability of the internal structure of the battery pack 200, and reducing the risk of short circuit.

[0047] In particular, when the structure is applied to the battery pack 200 of an active implantable neurostimulator, it can reduce the probability of failure, reduce the risk of the battery pack 200 failing in the patient's body and causing pain to the patient, and improve safety and stability.

[0048] Among them, when laser welding the pole 1 and the connecting piece 2, the welding environment should be a glove box filled with inert gas, or the inert gas should be continuously filled during the welding process to form a local inert gas environment, so as to avoid oxidation during the welding process and cause blackening problems, reduce the risk of brittle cracks, bubbles and the like in the welding structure, and reduce the risk of leakage of the battery pack 200.

[0049] It should be noted that the laser welding method provided by the present invention is only for illustrative purposes and is not intended to limit the present invention. Those skilled in the art may select a suitable welding method according to actual conditions as long as the connection between the pole 1 and the connecting piece 2 can be achieved.

[0050] In some embodiments, the length of the protrusion 13 along the first direction X is 0.2-0.5 mm.

[0051] Exemplarily, the length of the protrusion 13 along the first direction X may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm.

[0052] That is, the protrusion distance of the connecting piece 2 at one end of the pole 1 is 0.2-0.5 mm. If the length of the protrusion 13 is too short, welding is difficult, and if the length is too long, it will increase the occupied space and affect the space inside the battery pack 200. By setting the length of the protrusion 13 to 0.2-0.5 mm, welding is convenient and the impact on the internal space of the battery pack 200 is reduced.

[0053] In some embodiments, a distance that the solder 14 protrudes from the connecting piece 2 in the first direction X is less than or equal to a length of the protruding portion 13 in the first direction X.

[0054] That is, Figure 1 and Figure 2 As shown, after the pole 1 and the connecting piece 2 are welded, the solder 14 is coated on the outer circumference of the protrusion 13, and the solder 14 does not exceed the distance between the protrusion 13 and the connecting piece 2. On the one hand, the solder 14 can form a tight connection with the outer circumference of the protrusion 13, and on the other hand, it can also form a tight connection with the connecting piece 2, thereby reducing the risk of the solder 14 falling off and improving the stability after welding.

[0055] In some embodiments, the welding portion 12 is loosely matched with the first through hole 211 on the connecting sheet 2 , and a welding seam is formed between the outer wall of the welding portion 12 and the inner wall of the first through hole 211 .

[0056] By making the welding portion 12 and the first through hole 211 fit with each other in a clearance, it is convenient to assemble the pole 1 and the connecting piece 2 and define a suitable assembly position.

[0057] In some embodiments, the width of the weld is 0.02-0.03 mm.

[0058] Illustratively, the width of the weld may be 0.02 mm, 0.025 mm or 0.03 mm.

[0059] If the weld is too large, it will lead to the risk of welding leakage, while if the weld is too small, there will be a problem of greater difficulty in assembly. By setting the width of the weld to 0.02-0.03mm, it is not only easy to assemble the pole 1 and the connecting piece 2, but also can improve the welding quality and reduce the risk of welding leakage.

[0060] In some embodiments, Figure 3 and Figure 5 As shown, the connecting piece 2 includes a first connecting portion 21, a bending portion 22 and a second connecting portion 23;

[0061] The first connection portion 21 is connected to the second connection portion 23 through the bending portion 22;

[0062] The first through hole 211 is disposed on the first connecting portion 21 , and the second connecting portion 23 is connected to the tab 3 .

[0063] That is to say, the connecting piece 2 is a bent structure, and the first connecting portion 21 and the second connecting portion 23 located on the opposite sides of the bent portion 22 are respectively connected to the pole 1 and the pole lug 3; on the basis of realizing the electrical connection between the pole 1 and the pole lug 3, the connecting piece 2 with a bent structure has a higher structural strength and can reduce the risk of the connecting piece 2 falling off due to being squeezed by the pole lug 3 when the battery pack 200 is in operation.

[0064] In some embodiments, the pole 1 is a positive pole, the positive pole is cylindrical, and the first through hole 211 is a circular through hole.

[0065] That is, the electrode post 1 is a positive electrode post, which is connected to the positive electrode tab in the battery pack 200 via the connecting sheet 2 . By setting the positive electrode post and the first through hole 211 to be circular, the convenience of assembly can be improved.

[0066] Exemplarily, the diameter of the positive electrode column can be set to 0.5-0.8 mm.

[0067] Second, as Figure 1 As shown, the utility model provides a top cover assembly 100, including the welding structure of the pole and the connecting piece as described above, an upper cover plate 5 and a first insulating member 4;

[0068] The welding structure of the pole and the connecting piece comprises a pole 1 and a connecting piece 2;

[0069] The upper cover plate 5, the first insulating member 4 and the connecting piece 2 are arranged in sequence;

[0070] The upper cover plate 5 is provided with a passage for the pole to pass through, the first insulating member 4 is provided with a second through hole, and the pole 1 passes through the upper cover plate 5 and the second through hole in sequence to be connected to the connecting sheet 2 .

[0071] like Figure 4 and Figure 5 As shown, the first insulating member 4 is arranged between the upper cover plate 5 and the connecting plate 2, and the upper cover plate 5 and the first insulating member 4 are both provided with channels for the pole to pass through, and the second through hole on the first insulating member 4 can fix the pole 1 and play an insulating role to prevent the pole 1 from directly contacting the upper cover plate 5 and causing a short circuit.

[0072] In some embodiments, the length of the pole 1 between the connecting piece 2 and the first insulating member 4 is greater than or equal to 0.5 mm.

[0073] Exemplarily, the length of the pole 1 between the connecting piece 2 and the first insulating member 4 may be 0.5 mm, 0.6 mm, 0.8 mm or 1.0 mm.

[0074] Because the pole 1 and the connecting piece 2 need to be assembled with the first insulating member 4 before welding, in order to reduce the risk of the first insulating member 4 melting due to the heat generated during welding when the pole 1 and the connecting piece 2 are laser welded, the length between the connecting piece 2 and the first insulating member is set to be greater than 0.5 mm.

[0075] It should be noted that the length of the pole 1 between the connecting piece 2 and the first insulating member 4 can be appropriately set according to the size of the battery pack 200, as long as it can be ensured to be above 0.5 mm.

[0076] Furthermore, the top cover assembly 100 also includes a second insulating member 6, which is located below the connecting plate 2. When the top cover assembly 100 is installed to the battery pack 200, the second insulating member 6 can prevent the connecting plate from directly contacting the battery cell 7, thereby playing an insulating and protective role.

[0077] Exemplarily, the first insulating member 4 and the second insulating member 6 are made of plastic, and the first insulating member 4 and the second insulating member 6 made of plastic can provide good insulation.

[0078] Thirdly, Figure 4 and Figure 5 As shown, the present invention provides a battery pack 200, including the top cover assembly 100 as described above.

[0079] like Figure 4 and Figure 5 As shown, the battery pack 200 includes the above-mentioned top cover assembly 100, and also includes a battery cell 7, a shell 8 and a lower cover plate 9. The battery cell 7 is arranged in a receiving cavity formed by the top cover assembly 100, the shell 8 and the lower cover plate 9. The pole ear 3 is electrically connected to the pole 1 through the connecting piece 2 in the top cover assembly 100. The pole 1 of the battery pack 200 is exposed for supplying power to the outside.

[0080] Among them, the tab 3 is the positive tab, and correspondingly, the pole post 1 is the positive pole post. The positive tab is electrically connected to the positive tab through the connecting sheet 2, and one end of the positive pole post extends out of the battery pack 200 accommodating cavity for supplying power to the outside.

[0081] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A welding structure of a pole and a connecting piece, characterized in that: Including poles and connecting pieces; The connecting sheet is provided with a first through hole penetrating the connecting sheet; One end of the pole passes through the first through hole and protrudes from the connecting piece; the pole comprises a main body, a welding portion and a protruding portion arranged in sequence along a first direction; The main body and the protruding portion are respectively located on opposite sides of the connecting piece, and the welding portion is located in the first through hole; The outer wall of the welding portion is welded to the inner wall of the first through hole; The outer side wall of the protrusion is provided with solder, and the connection piece and the protrusion are connected by welding through the solder.

2. The welding structure of the pole and the connecting piece according to claim 1, characterized in that: The length of the protrusion along the first direction is 0.2-0.5 mm.

3. The welding structure of the pole and the connecting piece according to claim 1, characterized in that: A distance that the solder protrudes from the connection piece in the first direction is less than or equal to a length of the protruding portion in the first direction.

4. The welding structure of the pole and the connecting piece according to claim 1, characterized in that: The welding portion is loosely matched with the first through hole, and a welding seam is formed between the outer wall of the welding portion and the inner wall of the first through hole.

5. The welding structure of the pole and the connecting piece according to claim 4, characterized in that: The width of the weld is 0.02-0.03 mm.

6. The welding structure of the pole and the connecting piece according to any one of claims 1 to 5, characterized in that: The connecting piece includes a first connecting portion, a bending portion, and a second connecting portion; The first connecting portion is connected to the second connecting portion through the bending portion; The first through hole is disposed on the first connecting portion, and the second connecting portion is connected to the tab.

7. The welding structure of the pole and the connecting piece according to any one of claims 1 to 5, characterized in that: The pole is a positive pole, the positive pole is cylindrical, and the first through hole is a circular through hole.

8. A top cover assembly, characterized in that: It comprises the welding structure of the pole and the connecting piece according to any one of claims 1 to 7, an upper cover plate and a first insulating member; The welding structure of the pole and the connecting piece comprises a pole and a connecting piece; The upper cover plate, the first insulating member and the connecting piece are arranged in sequence; The upper cover plate is provided with a passage for the pole to pass through, the insulating member is provided with a second through hole, and the pole passes through the upper cover plate and the second through hole in sequence to be connected to the connecting piece.

9. The top cover assembly according to claim 8, characterized in that: The length of the pole located between the connecting piece and the first insulating member is greater than or equal to 0.5 mm.

10. A battery pack, characterized in that: Comprising the top cover assembly as claimed in claim 9.

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