Lithium ion battery

Abstract

The utility model relates to the technical field of power batteries, and discloses a lithium ion battery, which comprises a current collector, a rubber plug and a guide pin, the guide pin comprises an inner connecting part, a sealing part and an outer connecting part which are connected in sequence, the inner connecting part is welded with the current collector, the rubber plug is provided with avoiding holes which are in one-to-one correspondence with the sealing part, and the sealing part is in interference fit with the avoiding holes. A plurality of first annular bosses are annularly arranged on the periphery of the sealing part, the sealing part is of a cylindrical structure, the outer diameter of the sealing part is D0, the outer diameter of each first annular boss is D1, and D1-D0 is larger than or equal to 0.01 mm and smaller than or equal to 0.1 mm; or a plurality of second annular bosses are annularly arranged on the inner circumference of the receding hole, the outer diameter of the receding hole is D2, the inner diameter of each second annular boss is D3, and D2-D3 is larger than or equal to 0.01 mm and smaller than or equal to 0.1 mm. According to the lithium ion battery, the annular boss is arranged on the outer periphery of the sealing part or the inner periphery of the avoiding hole of the rubber plug, and the thickness of the annular boss is limited, so that the sealing performance of the lithium ion battery can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a lithium-ion battery. Background Technology

[0002] As a widely used energy storage device, the performance and safety of lithium-ion batteries largely depend on the design and material selection of battery components. For aluminum-cased pin-type capacitor batteries, a waisting method is used to compress the aluminum casing and sealant particles to achieve a tight fit. The pins pass through the holes of the sealant particles and are squeezed to form an interference fit, thus achieving a seal. As one of the key components of the battery, the pins not only play a role in transmitting current, but their design and structure also greatly affect the battery's sealing performance. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a lithium-ion battery in which the guide pin and the rubber stopper have good sealing performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A lithium-ion battery is provided, comprising a current collector, a rubber stopper, and a guide pin. The guide pin includes an inner connecting part, a sealing part, and an outer connecting part connected in sequence. The inner connecting part is welded to the current collector. The rubber stopper has clearance holes corresponding to the sealing parts. The sealing parts are interference-fitted with the clearance holes. The outer circumference of the sealing part is provided with a plurality of first annular bosses. The sealing part has a cylindrical structure. The outer diameter of the sealing part is D0, and the outer diameter of the first annular bosses is D1, where 0.01mm≤D1-D0≤0.1mm. Alternatively, the inner circumference of the clearance holes is provided with a plurality of second annular bosses. The diameter of the clearance holes is D2, and the inner diameter of the second annular bosses is D3, where 0.01mm≤D2-D3≤0.1mm.

[0006] As a further embodiment of the lithium-ion battery, the first annular boss has a curved surface and two transition surfaces. The two ends of the curved surface along the axial direction of the sealing part are respectively connected to the sealing part through one of the transition surfaces. The two transition surfaces are symmetrical to the curved surface. The curved surface is interference-fitted with the clearance hole. The second annular boss has the same structure as the first annular boss. The two ends of the curved surface of the second annular boss along the axial direction of the sealing part are respectively connected to the inner wall of the clearance hole through one of the transition surfaces.

[0007] As a further embodiment of the lithium-ion battery, the inner circumference of the clearance hole is provided with a first annular sealing groove corresponding to the first annular boss, and the first annular boss and the first annular sealing groove are interference-fitted.

[0008] As a further embodiment of the lithium-ion battery, the outer circumference of the sealing part is provided with a second annular sealing groove corresponding to the second annular boss, and the second annular boss and the second annular sealing groove are interference-fitted.

[0009] As a further embodiment of the lithium-ion battery, the inner connection portion has a smooth area and a rough area on its two sides along its thickness direction, and the rough area is welded to the current collector.

[0010] As a further embodiment of the lithium-ion battery, the area of ​​the rough surface region on one side of the inner connection portion is S1, and the area of ​​the smooth surface region is S2; the area of ​​the rough surface region on the other side of the inner connection portion is S1', and the area of ​​the smooth surface region on the other side is S2', 1%≤S1 / (S1+S2)≤99%, 1%≤S1' / (S1'+S2')≤99%.

[0011] As a further embodiment of the lithium-ion battery, the roughened region has multiple protrusions, the maximum thickness of which is less than the thickness of the smooth region.

[0012] As a further embodiment of the lithium-ion battery, the thickness of the smooth region is T0, the maximum thickness of the convex portion on one side is T1, the maximum thickness of the convex portion on the other side is T1', 0.1%≤T1 / T0≤10%, and 0.1%≤T1' / T0≤10%.

[0013] As a further embodiment of the lithium-ion battery, the protrusion is in the shape of a dot and / or a line.

[0014] As a further embodiment of the lithium-ion battery, the internal connection portion is ultrasonically welded to the current collector.

[0015] Beneficial effects:

[0016] This invention provides a first annular boss on the outer periphery of the sealing part or a second annular boss on the inner periphery of the clearance hole of the rubber plug. When the sealing part is inserted into the clearance hole, the difference between the outer diameter D1 of the first annular boss and the outer diameter D0 of the sealing part is controlled within 0.01mm-0.1mm (inclusive), or the difference between the inner diameter D3 of the second annular boss and the outer diameter D2 of the clearance hole is controlled within 0.01mm-0.1mm (inclusive). This ensures that the sealing part can be smoothly inserted into the clearance hole, and also improves the sealing effect between the connecting part and the clearance hole through the interference fit between the first annular boss and the clearance hole or the second annular boss and the sealing part.

[0017] This invention features a rough surface design for the inner connecting part, which increases the welding contact area when welding with the current collector, thereby improving the welding connection strength between the guide pin and the current collector. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the lithium-ion battery after removing the casing, as described in Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the guide needle described in Embodiment 1 of this utility model.

[0021] Figure 3 This is a side view of the guide pin described in Embodiment 1 of this utility model from a first perspective.

[0022] Figure 4 This is a side view of the guide pin described in Embodiment 1 of this utility model from a second perspective.

[0023] Figure 5 for Figure 4 A magnified view of part A in the diagram.

[0024] Figure 6 This is a schematic diagram of the rubber stopper described in Embodiment 1 of this utility model.

[0025] Figure 7 for Figure 6 A magnified view of part C in the diagram.

[0026] Figure 8 for Figure 4 A magnified view of part B in the diagram.

[0027] Figure 9 This is a schematic diagram of the structure of the lithium-ion battery described in Embodiment 1 of this utility model.

[0028] Figure 10 This is a partial cross-sectional view of the rubber stopper described in Embodiment 2 of this utility model.

[0029] Figure 11 This is a partially enlarged schematic diagram of the sealing part described in Embodiment 2 of this utility model.

[0030] Figures 1 to 11 middle:

[0031] 100, current collector; 200, rubber stopper; 300, guide pin; 310, inner connecting part; 311, smooth area; 312, rough surface area; 320, sealing part; 330, outer connecting part; 340, first annular boss; 341, curved surface; 342, transition surface; 350, second annular sealing groove; 400, clearance hole; 410, first annular sealing groove; 420, second annular boss; 500, housing. Detailed Implementation

[0032] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0036] Example 1

[0037] like Figures 1 to 8As shown, the lithium-ion battery of this embodiment includes a current collector 100, a rubber stopper 200, and a guide pin 300. The guide pin 300 includes an inner connecting part 310, a sealing part 320, and an outer connecting part 330 connected in sequence. The inner connecting part 310 is welded to the current collector 100. The rubber stopper 200 has clearance holes 400 that correspond one-to-one with the sealing part 320. The sealing part 320 is inserted into the clearance holes 400. The sealing part 320 has a cylindrical structure. The outer periphery of the sealing part 320 is provided with a plurality of first annular bosses 340. The first annular bosses 340 are interference-fitted with the clearance holes 400. The outer diameter of the sealing part 320 is D0, and the outer diameter of the first annular bosses 340 is D1, where 0.01mm≤D1-D0≤0.1mm.

[0038] In this embodiment, a first annular boss 340 is provided on the outer periphery of the sealing part 320. When the sealing part 320 is inserted into the clearance hole 400, the difference between the outer diameter D1 of the first annular boss 340 and the outer diameter D0 of the sealing part 320 is controlled between 0.01mm and 0.1mm (inclusive). This ensures that the sealing part 320 can be smoothly inserted into the clearance hole 400, and also improves the sealing effect between the sealing part 320 and the clearance hole 400 through the interference fit between the first annular boss 340 and the clearance hole 400. Optionally, the difference between the outer diameter D1 of the first annular boss 340 and the outer diameter D0 of the sealing part 320 may include, but is not limited to, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc., depending on the specific dimensions of the sealing part 320 and the clearance hole 400.

[0039] The first annular boss 340 and the sealing part 320 are made of the same material, both of which are metal, and the two are integrally formed.

[0040] Furthermore, such as Figure 4 and Figure 5 As shown, the first annular boss 340 has a curved surface 341 and two transition surfaces 342. The two ends of the curved surface 341 along the axial direction of the sealing part 320 are respectively connected to the sealing part 320 through a transition surface 342, as shown. Figure 5 As shown, the two transition surfaces 342 are inclined planes and symmetrical to the curved surface 341. The curved surface 341 serves as the outer peripheral surface of the first annular boss 340 and is interference-fitted with the clearance hole 400. The structural design of the curved surface 341 reduces the frictional resistance between the first annular boss 340 and the clearance hole 400 when the sealing part 320 is inserted into the clearance hole 400, while simultaneously ensuring a good sealing effect between them.

[0041] Furthermore, the first annular boss 340 is disposed on the outer periphery of the sealing portion 320, such as... Figure 6 and Figure 7 As shown, the inner circumference of the clearance hole 400 is provided with a first annular sealing groove 410 corresponding to the first annular boss 340, and the first annular boss 340 and the first annular sealing groove 410 are interference fit.

[0042] When the sealing part 320 is inserted into the clearance hole 400, the first annular boss 340 is located within the first annular sealing groove 410 and is interference-fitted with the first annular sealing groove 410. This structural design alters the flow path of fluid along the gap between the sealing part 320 and the clearance hole 400, increasing the fluid flow path and flow resistance, further improving the sealing effect between the sealing part 320 and the clearance hole 400, and reducing safety hazards caused by gas generation inside the lithium-ion battery and electrolyte leakage that is prone to occur during long-term storage.

[0043] For example, along the axial direction of the sealing part 320, the width of the groove bottom of the first annular sealing groove 410 opposite to the first annular boss 340 is greater than the width of the transition surface 342. When the first annular boss 340 presses the first annular sealing groove 410, it can make the first annular sealing groove 410 fit tightly with the first annular boss 340 when it is deformed by compression.

[0044] Furthermore, the first annular boss 340 is a circular ring structure, the center of which coincides with the center of the sealing part 320. The inner diameter of the circular ring structure is the outer diameter of the sealing part 320, which facilitates processing and forming. In other embodiments, the first annular boss 340 can also be designed as an inclined elliptical ring structure, that is, the plane on which the first annular boss 340 is located is set at an angle to the radial plane of the sealing part 320. The elliptical ring structure of the first annular boss 340 can also provide a good sealing effect between the sealing part 320 and the clearance hole 400.

[0045] In this embodiment, as Figure 2 and Figure 3 As shown, the outer periphery of the sealing part 320 is provided with three first annular protrusions 340 in a circular structure. The three first annular protrusions 340 are spaced apart along the length direction of the sealing part 320, and the spacing between two adjacent first annular protrusions 340 is the same. By providing multiple first annular protrusions 340, multiple sealing effects can be achieved.

[0046] Furthermore, such as Figure 3 and Figure 8 As shown, the inner connecting part 310 has a smooth area 311 and a rough area 312 on its two sides along its thickness direction, and the rough area 312 is welded to the current collector 100.

[0047] It is understandable that the rough surface area 312 is an area with an uneven and rough surface, containing pits and protrusions. Compared with the smooth area 311, the rough surface area 312 has a relatively large surface area. When it is welded to the current collector 100, it can increase the welding contact area, thereby improving the welding connection strength between the inner connection part 310 and the current collector 100.

[0048] In this embodiment, the area of ​​the rough surface region 312 on one side of the inner connecting part 310 is S1, and the area of ​​the smooth region 311 is S2; the area of ​​the rough surface region 312 on the other side of the inner connecting part 310 is S1', and the area of ​​the smooth region 311 on the other side is S2', 1%≤S1 / (S1+S2)≤99%, 1%≤S1' / (S1'+S2')≤99%. The area ratios of the rough surface region 312, S1 / (S1+S2) and S1' / (S1'+S2'), are respectively including but not limited to 1%, 2%, 3%, 4%, 5%, 6%, 7%, 10%, 12%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70%, 80%, 90%, 95%, 99%, etc. The specific ratios can be determined according to the size of the inner connection part 310 and its actual welding area with the current collector 100, so as to ensure a stable connection between the inner connection part 310 and the current collector 100.

[0049] In this embodiment, the roughened region 312 has multiple protrusions (not shown in the figure), and the maximum thickness of the protrusions is less than the thickness of the smooth region 311. When the maximum thickness of the protrusions is greater than the thickness of the smooth region 311, the welding of the protrusions to the current collector 100 may prevent the current collector 100 from contacting the bottom of the roughened region 312. Under the impact of external force, the inner connecting part 310 and the current collector 100 will move relative to each other, thereby affecting the connection stability between the guide pin 300 and the current collector 100.

[0050] Furthermore, the thickness of the smooth region 311 is T0, where the maximum thickness of the protrusion on one side is T1, and the maximum thickness of the protrusion on the other side is T1', with 0.1%≤T1 / T0≤10% and 0.1%≤T1' / T0≤10%. In this embodiment, the ratio between the maximum thickness of the protrusions on both sides of the inner connecting part 310 and the thickness of the smooth region 311 is limited to not less than 0.1% and not more than 10%, which can ensure a stable connection between the inner connecting part 310 and the current collector 100, the current collector 100 and the protrusions on both sides of the inner connecting part 310, as well as the recesses between the protrusions, when the inner connecting part 310 is welded to the current collector 100.

[0051] Optionally, the protrusions are dot-shaped and can be obtained by etching the inner connecting portion 310. Specifically, the smooth area 311 of the inner connecting portion 310 is covered, exposing the rough area 312, and then etching is performed in an etching solution to obtain the rough area 312 with several dot-shaped protrusions. This etching technique is a conventional technique in the field and will not be described in detail here.

[0052] Of course, in other embodiments, the protrusion is linear in shape, specifically it can be a regular or irregular line, such as a straight line or a curve, and can be formed by hot pressing or laser modification followed by etching.

[0053] The above-mentioned dot-shaped or line-shaped protrusions can improve the welding connection strength between the inner connecting part 310 and the current collector 100.

[0054] In other embodiments, some of the protrusions are dot-like structures and others are line-like structures, which can also improve the welding connection strength between the inner connecting part 310 and the current collector 100.

[0055] Furthermore, the inner connecting part 310 is ultrasonically welded to the current collector 100. Ultrasonic welding is a standard technique in the field of welding technology. In this embodiment, ultrasonic welding is applied to the connection between the guide pin 300 and the current collector 100, so that the inner connecting part 310 of the guide pin 300 and the current collector 100 can make chemical fusion contact, which can reduce the thickness of the solder mark and reduce the contact resistance.

[0056] like Figure 9 As shown, the lithium-ion battery in this embodiment also includes a housing 500, which encloses the current collector 100 and the rubber stopper 200. The inner connecting part 310 and the sealing part 320 are located inside the housing 500, and the outer connecting part 330 is located outside the housing 500.

[0057] The housing 500 adopts a waist-shaped structure design at the position corresponding to the rubber plug 200, which can further improve the sealing effect between the rubber plug 200 and the sealing part 320 of the guide needle 300.

[0058] like Figure 9 As shown, the rubber stopper 200 is provided with two clearance holes 400. Correspondingly, there are two guide pins 300. The two guide pins 300 are respectively inserted into one of the clearance holes 400. The inner connecting part 310 of one guide pin 300 is ultrasonically welded to the positive electrode of the current collector 100, and the inner connecting part 310 of the other guide pin 300 is ultrasonically welded to the negative electrode of the current collector 100.

[0059] Example 2

[0060] This embodiment is basically the same as the first embodiment above, except that the structural design of the first annular boss 340 and the first annular sealing groove 410 is cancelled. Instead, a smooth surface design is adopted for the outer periphery of the sealing part 320 of the lithium-ion battery, and a second annular boss 420 is provided on the inner periphery of the clearance hole 400.

[0061] like Figure 10 As shown, the inner circumference of the clearance hole 400 is provided with several second annular bosses 420. The diameter of the clearance hole 400 is D2, and the inner diameter of the second annular bosses 420 is D3, where 0.01mm≤D2-D3≤0.1mm.

[0062] In this embodiment, by providing a plurality of second annular bosses 420 around the inner circumference of the clearance hole 400, when the sealing part 320 is inserted into the clearance hole 400, the difference between the inner diameter D3 of the second annular bosses 420 and the outer diameter D2 of the clearance hole 400 is controlled between 0.01mm and 0.1mm (inclusive). This ensures that the sealing part 320 can be smoothly inserted into the clearance hole 400, and also improves the sealing effect between the inner connecting part 310 and the clearance hole 400 through the interference fit between the second annular bosses 420 and the sealing part 320. Optionally, the difference between the inner diameter D3 of the second annular boss 420 and the diameter D2 of the clearance hole 400 may include, but is not limited to, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc., depending on the dimensions of the sealing part 320 and the clearance hole 400.

[0063] For example, the second annular boss 420 has the same structure as the first annular boss 340, that is, the structure of the curved surface and transition surface of the second annular boss 420 is the same as the structure of the curved surface 341 and transition surface 342 of the first annular boss 340. The difference is that the two ends of the curved surface of the second annular boss 420 along the axial direction of the sealing part 320 are respectively connected to the inner wall of the clearance hole 400 through a transition surface. The curved surface of the second annular boss 420 serves as the inner circumferential surface of the second annular boss 420 and is interference-fitted with the outer circumference of the sealing part 320, so that the second annular boss 420 and the sealing part 320 have a good sealing effect.

[0064] The second annular boss 420 and the rubber stopper 200 are made of the same material, both of which are plastic, and the two are integrally injection molded structures.

[0065] Furthermore, such as Figure 11 As shown, the outer periphery of the sealing part 320 is provided with a second annular sealing groove 350 corresponding to the second annular boss 420, and the second annular boss 420 and the second annular sealing groove 350 are interference fit.

[0066] When the sealing part 320 is inserted into the clearance hole 400, the second annular boss 420 is located within the second annular sealing groove 350 and is interference-fitted with the second annular sealing groove 350. This structural design alters the fluid flow path during leakage, increases the fluid flow path and flow resistance, further improving the sealing effect between the sealing part 320 and the clearance hole 400, and reducing safety hazards caused by gas generation inside the lithium-ion battery and electrolyte leakage that is prone to occur during long-term storage.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A lithium-ion battery, characterized by, The catheter includes a current collector, a rubber plug and a guide needle, the guide needle includes an inner connecting part, a sealing part and an outer connecting part connected in sequence, the inner connecting part is welded with the current collector, the rubber plug is provided with a relief hole corresponding to the sealing part, the sealing part is in interference fit with the relief hole, a plurality of first annular bosses are arranged on the outer periphery of the sealing part, the sealing part is in cylindrical structure, the outer diameter of the sealing part is D0, the outer diameter of the first annular boss is D1, 0.01mm≤D1-D0≤0.1mm; or, a plurality of second annular bosses are arranged on the inner periphery of the relief hole, the diameter of the relief hole is D2, the inner diameter of the second annular boss is D3, 0.01mm≤D2-D3≤0.1mm.

2. The lithium-ion battery of claim 1, wherein, The first annular boss has a curved surface and two transition surfaces, the curved surface is connected to the sealing part through one of the transition surfaces at each end of the sealing part in the axial direction, the two transition surfaces are symmetrical to the curved surface, the curved surface is in interference fit with the relief hole, the second annular boss is consistent with the structure of the first annular boss, the curved surface of the second annular boss is connected to the inner wall of the relief hole through one of the transition surfaces at each end of the sealing part in the axial direction.

3. The lithium-ion battery of claim 1, wherein, The inner periphery of the relief hole is provided with a first annular sealing groove corresponding to the first annular boss, and the first annular boss is in interference fit with the first annular sealing groove.

4. The lithium-ion battery of claim 1, wherein, The outer periphery of the sealing part is provided with a second annular sealing groove corresponding to the second annular boss, and the second annular boss is in interference fit with the second annular sealing groove.

5. The lithium-ion battery of claim 1, wherein, The inner connecting part has a smooth area and a rough area on each side in the thickness direction, and the rough area is welded with the current collector.

6. The lithium-ion battery of claim 5, wherein, The area of the rough area on one side of the inner connecting part is S1, and the area of the smooth area is S2; the area of the rough area on the other side of the inner connecting part is S1', and the area of the smooth area on the other side is S2', 1%≤S1 / (S1+S2)≤99%, 1%≤S1'(S1'+S2']≤99%.

7. The lithium-ion battery of claim 5, wherein, The rough area has a plurality of convex parts, and the maximum thickness of the convex part is less than the thickness of the smooth area.

8. The lithium-ion battery of claim 7, wherein, The thickness of the smooth area is T0, the maximum thickness of the convex part on one side is T1, and the maximum thickness of the convex part on the other side is T1', 0.1%≤T1 / T0≤10%, 0.1%≤T1' / T0≤10%.

9. The lithium-ion battery of claim 7, wherein, The convex part is in the shape of a point and / or a line.

10. The lithium-ion battery according to any one of claims 1 to 9, characterized in that, The inner connecting part is ultrasonically welded with the current collector.

Images