Cylindrical sodium battery

Abstract

The utility model provides a sodium cylindrical battery, and relates to the technical field of batteries. The cylindrical sodium battery comprises a shell; the first end part of the shell is provided with a first collector plate and a positive pole, and the second end part of the shell is provided with a second collector plate and a negative pole; each of the first flow collecting disc and the second flow collecting disc comprises a disc body; the disc body comprises a first end face and a second end face. The first end face is provided with a groove, the inward concave direction of the groove faces the second end face, and the groove forms a protrusion on the second end face. The second end face is arranged opposite to a tab in the shell, and the bulge is used for being attached to the tab; a plurality of non-intersecting welding areas are arranged in the groove, the welding areas are in a curve shape, and the welding areas extend from the first side of the groove to the second side of the groove; and the welding area is used for being welded with a tab. When welding is carried out in the groove, pseudo soldering can be effectively avoided; and through the plurality of curve-shaped welding areas in the groove, the connection strength and reliability between the plate body and the tab are ensured.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a sodium cylindrical battery. Background Art

[0002] Sodium cylindrical batteries have many advantages such as large capacity, long service life, no memory effect, and environmental friendliness.

[0003] A sodium cylindrical battery includes a cylindrical housing and an inner core disposed within the housing. A positive tab is provided on the positive electrode plate of the inner core, and a negative tab is provided on the negative electrode plate of the inner core. Among them, both between the positive tab and the positive terminal, and between the negative tab and the negative terminal, are fixedly connected through a current collector plate. When fixing the current collector plate, welding is usually performed along the outer edge of the current collector plate, so that the current collector plate is fixedly connected to the corresponding tab.

[0004] Due to assembly errors or its own dimensional errors, there will be a certain gap between the outer edge of the current collector plate and the tab. If the gap is large, there may be a situation of poor welding, which will affect the connection strength and reliability between the current collector plate and the tab. Utility Model Content

[0005] The purpose of this application is to overcome the defects of the prior art and provide a sodium cylindrical battery to solve the problems in the prior art.

[0006] To solve the above problems, an embodiment of this application provides a sodium cylindrical battery, including a housing, the housing includes a first end and a second end; the first end is provided with a first current collector plate and a positive terminal fixedly connected thereto, and the second end is provided with a second current collector plate and a negative terminal fixedly connected thereto;

[0007] Both the first current collector plate and the second current collector plate include a plate body; the plate body includes a first end face and a second end face disposed at both ends in its own thickness direction; a groove is provided on the first end face, wherein the concave direction of the groove faces the second end face, and a protrusion is formed on the second end face of the groove; the second end face is disposed opposite to the tab within the housing, and the protrusion is used to fit with the tab;

[0008] The first side of the groove extends towards the center of the plate body, and the second side extends towards the outer edge of the plate body;

[0009] The groove has a plurality of non-intersecting welding areas, the welding areas are curved, and the welding areas extend from the first side of the groove to the second side; the welding areas are used to be welded to the tab.

[0010] In a possible implementation manner, a center hole is provided on the plate body;

[0011] A plurality of the grooves are provided on the disc body, and the grooves are distributed in an annular array with respect to the central hole; wherein, an intermediate through hole is provided between two adjacent grooves; the number of the grooves is 4 to 10; the welding area is wavy.

[0012] In a possible implementation manner, the positive pole column includes a connected first column body and a first base, and the cross-sectional area of the first column body is smaller than the cross-sectional area of the first base. Wherein, the first column body is inserted into the central hole of the first current collector disc, and the first column body partially passes through the central hole of the first current collector disc; the cross-sectional area of the first base is larger than the cross-sectional area of the central hole of the first current collector disc;

[0013] The negative pole column includes a connected second column body and a second base, and the cross-sectional area of the second column body is smaller than the cross-sectional area of the second base. Wherein, the second column body is inserted into the central hole of the second current collector disc, and the second column body partially passes through the central hole of the second current collector disc; the cross-sectional area of the second base is larger than the cross-sectional area of the central hole of the second current collector disc.

[0014] In a possible implementation manner, a liquid injection hole is provided on the positive pole column, and the liquid injection hole penetrates through the first column body and the first base.

[0015] In a possible implementation manner, the circumferential surface of the first column body is welded and connected to the inner wall and / or outer edge of the central hole of the first current collector disc;

[0016] The circumferential surface of the second column body is welded and connected to the inner wall and / or outer edge of the central hole of the second current collector disc.

[0017] In a possible implementation manner, a first end cover is covered on the first current collector disc, and the first end cover is fixedly connected to the housing;

[0018] A second end cover is covered on the second current collector disc, and the second end cover is fixedly connected to the housing;

[0019] Both the first end cover and the second end cover include a cover body; the outer edge of the cover body is welded to the housing.

[0020] In a possible implementation manner, explosion-proof valves are provided on both the first end cover and the second end cover.

[0021] In a possible implementation manner, the cover body is provided with an installation through hole;

[0022] The positive pole column is partially inserted into the installation through hole of the first end cover;

[0023] The negative electrode terminal part is inserted into the installation through hole of the second end cap.

[0024] In a possible implementation manner, the circumferential surface of the positive electrode terminal is welded to the inner wall and / or outer edge of the installation through hole of the first end cap;

[0025] The circumferential surface of the negative electrode terminal is welded to the inner wall and / or outer edge of the installation through hole of the second end cap.

[0026] In a possible implementation manner, a convex ring is provided on the outer edge of the installation through hole, and the convex ring surrounds the installation through hole; wherein, the convex ring is provided on at least one side of the cover body; the inner diameter of the convex ring is the same as the inner diameter of the installation through hole.

[0027] The beneficial effects of the present application include:

[0028] A groove is provided on the first end surface of the disc body, wherein the concave direction of the groove faces the second end surface, and a protrusion is formed on the second end surface by the groove. During assembly, the second end surface is disposed opposite to the tab in the housing. Due to the presence of the protrusion, even if the second end surface or the tab is uneven, within a certain error range, it can be ensured that the protrusion fits with the tab. Therefore, when welding in the groove, the occurrence of virtual soldering can be effectively avoided.

[0029] The groove has a plurality of non-intersecting welding areas, the welding areas are curved, the welding areas extend from the first side of the groove to the second side, and the welding areas are used for welding to the tab. Through the plurality of curved welding areas, the strength and reliability of the connection between the disc body and the tab are ensured. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Shows a schematic diagram of a sodium cylindrical battery;

[0032] Figure 2 Shows an exploded schematic diagram of a sodium cylindrical battery;

[0033] Figure 3 Shows a schematic diagram of a disc body;

[0034] Figure 4 Shows Figure 3 The second schematic diagram of the disc body in

[0035] Figure 5 shows Figure 3 a front view of the middle disk body;

[0036] Figure 6 shows Figure 5 a side view of;

[0037] Figure 7 shows a schematic diagram of a positive electrode terminal;

[0038] Figure 8 shows a schematic diagram of a negative electrode terminal;

[0039] Figure 9 shows a schematic diagram of a cover body.

[0040] Description of main component symbols:

[0041] 100 - housing; 101 - first end; 102 - second end; 110 - tab; 210 - first current collector plate; 220 - positive electrode terminal; 221 - first cylinder; 222 - first base; 223 - liquid injection hole; 310 - second current collector plate; 320 - negative electrode terminal; 321 - second cylinder; 322 - second base; 400 - disk body; 401 - central hole; 410 - first end face; 411 - groove; 4111 - welding area; 420 - second end face; 421 - protrusion; 430 - intermediate through hole; 510 - first end cover; 520 - second end cover; 530 - cover body; 531 - mounting through hole; 532 - convex ring. Detailed implementation manners

[0042] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0044] The welding mentioned in the present application includes laser welding and the like.

[0045] Embodiment

[0046] As Figure 1 and Figure 2 shown, a sodium cylindrical battery is proposed, which includes a housing 100. The housing 100 includes a first end 101 and a second end 102. The housing 100 is a hollow structure, and its interior is used to fill the inner core.

[0047] A first current collector plate 210 and a positive electrode terminal 220 are fixedly connected to the first end 101, and a second current collector plate 310 and a negative electrode terminal 320 are fixedly connected to the second end 102.

[0048] Both the first current collector plate 210 and the second current collector plate 310 include a plate body 400. In this embodiment, the structures of the first current collector plate 210 and the second current collector plate 310 are the same.

[0049] As Figures 3 - 6 shown, the plate body 400 includes a first end face 410 and a second end face 420 disposed at both ends in its thickness direction. A groove 411 is provided on the first end face 410. Among them, the concave direction of the groove 411 faces the second end face 420, and a protrusion 421 is formed on the second end face 420 corresponding to the groove 411. The groove 411 can be obtained by stamping or the like. Among them, when stamping, the protrusion 421 is formed synchronously with the groove 411.

[0050] The second end face 420 is disposed opposite to the tab 110 in the housing 100, and the protrusion 421 is used to fit with the tab 110. The protrusion 421 of the first current collector plate 210 fits with the tab 110 of the first end 101, and the protrusion 421 of the second current collector plate 310 fits with the tab 110 of the second end 102.

[0051] The tab 110 has a certain elasticity. During installation, the protrusion 421 abuts against the tab 110. Under the action of pressure, the tab 110 will undergo a certain deformation, so as to fit more closely with the protrusion 421. It should be noted that only the tab 110 of the first end 101 is shown in the drawings.

[0052] The first side of the groove 411 extends towards the center of the plate body 400, and the second side extends towards the outer edge of the plate body 400. The groove 411 can be a kidney-shaped groove.

[0053] Referring to Figure 5 , there are multiple non-intersecting welding areas 4111 in the groove 411. The welding areas 4111 are curved and extend from the first side of the groove 411 to the second side. The welding areas 4111 are used to be welded to the tab 110. Since the size of the groove 411 is limited, the number of the welding areas 4111 can be 2 to 4.

[0054] The welding areas 4111 do not intersect with each other, which can increase the effective welding area.

[0055] The welding head performs welding operations in the groove 411 along a curved track, thereby forming the welding area 4111.

[0056] In this embodiment, a groove 411 is provided on the first end face 410 of the disk body 400. Among them, the concave direction of the groove 411 faces the second end face 420, and a protrusion 421 is formed on the second end face 420 of the groove 411. During assembly, the second end face 420 is disposed opposite to the tab 110 in the housing 100. Due to the existence of the protrusion 421, even if the second end face 420 or the tab 110 is uneven, within a certain error range, it can be ensured that the protrusion 421 is in contact with the tab 110. Therefore, when welding in the groove 411, the occurrence of false soldering can be effectively avoided.

[0057] Furthermore, there are multiple non-intersecting welding areas 4111 in the groove 411. The welding areas 4111 are curved, and the welding areas 4111 extend from the first side of the groove 411 to the second side. The welding areas 4111 are used to be welded to the tab 110. Through the multiple curved welding areas 4111, the connection strength and reliability between the disk body 400 and the tab 110 are ensured.

[0058] In this embodiment, a central hole 401 is provided in the disk body 400. A plurality of grooves 411 are provided on the disk body 400, and the grooves 411 are arranged in an annular array with respect to the central hole 401. Among them, an intermediate through hole 430 is provided between two adjacent grooves 411. By providing the intermediate through hole 430, the total weight of the disk body 400 can be reduced.

[0059] The number of the grooves 411 is 4 to 10. If the number of the grooves 411 is too large, the processing difficulty will increase and the structural strength of the disk body 400 will be affected; if the number of the grooves 411 is too small, the welding area will become smaller, which is not conducive to the connection strength between the disk body 400 and the tab 110. In some embodiments, the number of the grooves 411 can be 4, 5, 8, 9, etc.

[0060] The welding area 4111 is wavy, which can increase the welding area, thereby improving the connection strength between the disk body 400 and the tab 110.

[0061] As Figure 7 shown, the positive electrode terminal 220 includes a connected first column 221 and a first base 222. Both the first column 221 and the first base 222 are cylindrical, and the two are coaxially arranged. Among them, the first column 221 and the first base 222 can be an integral structure.

[0062] The cross-sectional area of the first cylinder 221 is smaller than that of the first base 222. The first cylinder 221 is inserted into the central hole 401 of the first current collector plate 210, and the first cylinder 221 partially passes through the central hole 401 of the first current collector plate 210.

[0063] The cross-sectional area of the first base 222 is larger than that of the central hole 401 of the first current collector plate 210, so that the first base 222 cannot be inserted into the central hole 401 of the first current collector plate 210. By providing the first base 222, the first cylinder 221 can be installed and limited.

[0064] In this embodiment, a liquid injection hole 223 is provided in the positive electrode terminal 220, and the liquid injection hole 223 penetrates through the first cylinder 221 and the first base 222.

[0065] As Figure 8 shown, the negative electrode terminal 320 includes a connected second cylinder 321 and a second base 322. Both the second cylinder 321 and the second base 322 are cylindrical, and the two are coaxially arranged. Among them, the second cylinder 321 and the second base 322 can be an integral structure.

[0066] The cross-sectional area of the second cylinder 321 is smaller than that of the second base 322. The second cylinder 321 is inserted into the central hole 401 of the second current collector plate 310, and the second cylinder 321 partially passes through the central hole 401 of the second current collector plate 310.

[0067] The cross-sectional area of the second base 322 is larger than that of the central hole 401 of the second current collector plate 310, so that the second base 322 cannot be inserted into the central hole 401 of the second current collector plate 310. By providing the second base 322, the second cylinder 321 can be installed and limited.

[0068] In this embodiment, the circumferential surface of the first cylinder 221 is welded to the inner wall and / or outer edge of the central hole 401 of the first current collector plate 210, and the circumferential surface of the second cylinder 321 is welded to the inner wall and / or outer edge of the central hole 401 of the second current collector plate 310.

[0069] In this embodiment, a first end cover 510 is covered on the first current collector plate 210, and the first end cover 510 is fixedly connected to the housing 100; a second end cover 520 is covered on the second current collector plate 310, and the second end cover 520 is fixedly connected to the housing 100.

[0070] Both the first end cover 510 and the second end cover 520 include a cover body 530, and the outer edge of the cover body 530 is welded to the housing 100.

[0071] In this embodiment, the structures of the first end cap 510 and the second end cap 520 are the same.

[0072] Explosion-proof valves can be provided on both the first end cap 510 and the second end cap 520, thereby improving the safety of using the sodium cylindrical battery. The structure of the explosion-proof valve can refer to the existing design and will not be elaborated herein.

[0073] As Figure 9 shown, the cover body 530 is provided with an installation through hole 531.

[0074] After assembly, a part of the positive electrode terminal 220 is inserted into the installation through hole 531 of the first end cap 510; a part of the negative electrode terminal 320 is inserted into the installation through hole 531 of the second end cap 520.

[0075] In this embodiment, the circumferential surface of the positive electrode terminal 220 is welded to the inner wall and / or outer edge of the installation through hole 531 of the first end cap 510; the circumferential surface of the negative electrode terminal 320 is welded to the inner wall and / or outer edge of the installation through hole 531 of the second end cap 520.

[0076] Furthermore, a convex ring 532 is provided on the outer edge of the installation through hole 531, and the convex ring 532 is arranged around the installation through hole 531. Among them, at least one side of the cover body 530 is provided with the convex ring 532. The inner diameter of the convex ring 532 is the same as the inner diameter of the installation through hole 531.

[0077] By providing the convex ring 532, the contact area between the cover body 530 and the electrode terminal (referring to the positive electrode terminal 220 and the negative electrode terminal 320) can be increased. When welding, the welding area between the cover body 530 and the electrode terminal can be increased, thereby improving the connection strength between the cover body 530 and the electrode terminal.

[0078] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A sodium cylindrical battery, characterized in that: The housing comprises a first end and a second end; the first end is provided with a first current collecting plate and a positive pole connected in a fixed manner, and the second end is provided with a second current collecting plate and a negative pole connected in a fixed manner; The first current collecting disc and the second current collecting disc both include a disc body; the disc body includes a first end face and a second end face respectively disposed at two ends of the disc body in a thickness direction; a groove is disposed on the first end face, wherein the inner concave direction of the groove faces the second end face, and a protrusion is formed on the second end face of the groove; the second end face is disposed opposite to the pole ear in the housing, and the protrusion is used to fit with the pole ear; A first side of the groove extends toward the center of the disk body, and a second side extends toward the outer edge of the disk body; The groove has a plurality of non-intersecting welding areas in a curved shape, and the welding areas extend from the first side of the groove to the second side; the welding areas are used to be connected to the tab by welding.

2. The sodium cylindrical battery according to claim 1, characterized in that: The disk body is provided with a central hole; The disk body is provided with a plurality of the grooves, which are distributed in a circular array about the central hole; wherein an intermediate through hole is provided between two adjacent grooves; the number of the grooves is 4 to 10; and the welding area is in a wavy line shape.

3. The sodium cylindrical battery according to claim 2, characterized in that: The positive electrode column comprises a first column and a first base connected to each other, the cross-sectional area of ​​the first column is smaller than the cross-sectional area of ​​the first base, wherein the first column is inserted into the central hole of the first current collecting disk, and the first column partially passes through the central hole of the first current collecting disk; the cross-sectional area of ​​the first base is larger than the cross-sectional area of ​​the central hole of the first current collecting disk; The negative electrode pole includes a second column and a second base connected to each other, and the cross-sectional area of ​​the second column is smaller than the cross-sectional area of ​​the second base, wherein the second column is inserted into the center hole of the second current collecting disk, and the second column partially passes through the center hole of the second current collecting disk; the cross-sectional area of ​​the second base is larger than the cross-sectional area of ​​the center hole of the second current collecting disk.

4. The sodium cylindrical battery according to claim 3, characterized in that: The positive electrode column is provided with a liquid injection hole, and the liquid injection hole passes through the first column and the first base.

5. The sodium cylindrical battery according to claim 3, characterized in that: The circumferential surface of the first column is welded to the inner wall and / or the outer edge of the central hole of the first collecting plate; The circumferential surface of the second column is connected to the inner wall and / or the outer edge of the central hole of the second collecting plate by welding.

6. The sodium cylindrical battery according to any one of claims 1 to 5, characterized in that: The first current collecting plate is covered with a first end cover, and the first end cover is fixedly connected to the shell; The second current collecting plate is covered with a second end cover, and the second end cover is fixedly connected to the shell; The first end cover and the second end cover both include a cover body; the outer edge of the cover body is welded to the shell.

7. The sodium cylindrical battery according to claim 6, characterized in that: The first end cover and the second end cover are both provided with explosion-proof valves.

8. The sodium cylindrical battery according to claim 6, characterized in that: The cover body is provided with a mounting through hole; The positive electrode column is partially inserted into the mounting through hole of the first end cover; The negative electrode pole portion is inserted into the mounting through hole of the second end cover.

9. The sodium cylindrical battery according to claim 8, characterized in that: The circumferential surface of the positive electrode column is welded to the inner wall and / or the outer edge of the mounting through hole of the first end cover; The circumferential surface of the negative electrode column is welded to the inner wall and / or the outer edge of the mounting through hole of the second end cover.

10. The sodium cylindrical battery according to claim 8, characterized in that: A convex ring is arranged at the outer edge of the mounting through hole, and the convex ring is arranged around the mounting through hole; wherein, the convex ring is arranged on at least one side of the cover body; and the inner diameter of the convex ring is the same as the inner diameter of the mounting through hole.

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