WO2019148463A1 - Terminal tab for use in cylindrical battery and cylindrical battery - Google Patents

Abstract

Disclosed in the present invention are a terminal tab for use in a cylindrical battery and a cylindrical battery. The cylindrical battery is provided with electrode plates therein. The terminal tab comprises an electrode portion and a connecting portion. The electrode portion is electrically connected to the electrode plate by means of the connecting portion. The connecting portion is wound together with the electrode plate and completely or partially eliminates a gap therebetween when wound together with the electrode plate. An outer surface of the connecting portion wound together with the electrode plate is curved such that the connecting portion and the electrode plate adhere closely and are wound together The outer surface of the connecting portion of the terminal tab in the present invention is curved, which ensures that the terminal tab and the electrode plate adhere closely when a battery cell is formed. Further, the connecting portion becomes gradually thinner from the middle to both sides in a circumferential direction, such that, when compared with a conventional sheet terminal tab, the middle portion of the connecting portion, when wound together with electrode plate, can completely or partially eliminate the gap therebetween, thereby minimizing the gap and increasing the space utilization of a battery.

Description

Ear and cylindrical battery for cylindrical battery

[Technical Field]

The present invention relates to the field of power supplies, and more particularly to a tab and a cylindrical battery for a cylindrical battery.

 【Background technique】

Cylindrical batteries are most commonly used in battery applications. Cylindrical batteries are batteries that look like cylinders. Cylindrical batteries have high capacity, long cycle life, and a wide temperature range.

1 is a schematic structural view of an embodiment of a prior art cylindrical battery. The prior art cylindrical battery 100 has a closed bottom and an open top outer casing, the open top end being sealed by the gasket 101 and the battery cover 102, and the gasket 101 is pressed between the battery casing and the battery cover 102 to press the negative electrode 103 The positive electrode sheet 104 and the electrolyte are sealed inside the battery. The negative electrode sheet 103, the positive electrode sheet 104 and the separator are wound together to form a battery core, the negative electrode sheet 103 is connected to the negative electrode tab, the positive electrode sheet 104 is connected to the positive electrode tab, and the negative electrode is passed through the negative electrode tab and the inner surface of the battery case. Electrically connected, the positive electrode protrudes from the top end of the electrode assembly, and the positive electrode is connected to the inner surface of the battery cover 102 through the positive electrode tab, and the negative electrode tab and the positive electrode tab are in a sheet-like structure. At the same time, the battery has a separate positive end cap 105 that is secured by the top edge of the battery housing that is crimped inwardly and the gasket and has one or more venting holes (not shown).

In the prior art, the positive and negative electrode tabs are in the form of a square sheet. In the process of curling the positive and negative electrodes, the bonding between the tabs and the pole pieces is not tight. At the same time, the tab-shaped tabs make the hollow space inside the battery larger when curled, which reduces the space utilization of the battery.

 [Summary of the Invention]

The technical problem to be solved by the present invention is to provide a tab and a cylindrical battery for a cylindrical battery, which can closely fit the tabs and the pole pieces and improve the space utilization ratio of the cylindrical battery.

In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a tab for a cylindrical battery, wherein the cylindrical battery is provided with a pole piece, the tab includes an electrode portion and a connecting portion, and the electrode portion Electrically connecting with the pole piece through the connecting portion, the connecting portion is wound with the pole piece, and completely or partially fills a hollow gap after the pole piece is wound, and the connecting portion is The outer surface of the pole piece phase winding is a curved surface, so that the connecting portion and the pole piece are closely fitted and wound.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a cylindrical battery, comprising: a battery core, the battery core is formed by winding a pole piece and a diaphragm; and an outer casing, the outer casing receiving the electric core;

a tab, the tab includes an electrode portion and a connecting portion, the electrode portion is electrically connected to the pole piece through the connecting portion, the connecting portion is wound with the pole piece, and the pole piece is wound After the winding, the hollow space is completely or partially filled, and the outer surface of the connecting portion and the pole piece is curved, so that the connecting portion and the pole piece are closely fitted and wound.

The beneficial effects of the present invention are: different from the prior art, in the present invention, the outer surface of the tab connection portion is provided with a curved surface, which can ensure the close contact between the tab and the pole piece when forming the battery cell Further, compared with the tab-shaped tabs, the central portion of the connecting portion after the pole piece is wound can fully or partially fill the hollow space, thereby reducing the hollow space, thereby improving the space utilization of the battery.

 [Description of the Drawings]

1 is a schematic structural view of an embodiment of a prior art cylindrical battery;

2 is a schematic structural view of an embodiment of a tab for a cylindrical battery according to the present invention;

3 is a schematic view of a first embodiment of a cylindrical battery of the present invention;

Figure 4 is a schematic view showing a second embodiment of the cylindrical battery of the present invention;

Figure 5 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of Figure 3;

Figure 6 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of Figure 4;

Figure 7 is a schematic view showing a third embodiment of the cylindrical battery of the present invention;

Figure 8 is a schematic view showing a fourth embodiment of the cylindrical battery of the invention;

Figure 9 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of Figure 7;

Figure 10 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of Figure 8.

【Detailed ways】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 2, FIG. 2 is a schematic structural view of an embodiment of a tab for a cylindrical battery according to the present invention. The tab 20 for a cylindrical battery of the present embodiment includes an electrode portion 21 as a positive electrode or a negative electrode of a cylindrical battery, and an end portion of the cylindrical battery that protrudes away from one end of the battery pole piece, or a cylinder The end portion of the battery is flush, the connecting portion 22 is gradually thinned from the center to both sides in the circumferential direction, and the outer surface thereof is a curved surface, and the connecting portion 22 connects the electrode portion 21 and the battery pole piece.

In the present embodiment, the electrode portion 21 of the tab 20 has a circular or elliptical cross section, and the connecting portion 22 of the tab 20 has a semicircular cross section, and the outer surface is a curved surface, which ensures the arc surface. When the battery cells are formed, the tabs are closely attached to the pole pieces. Further, since the connecting portion 22 is gradually thinned from the central portion to both sides in the circumferential direction, compared with the tab-shaped tabs, the central portion of the connecting portion 22 after the pole piece is wound can completely or partially fill the hollow space to make the hollow The gap is reduced, thereby increasing the space utilization of the battery.

In other specific embodiments, the cross section of the connecting portion 22 may be a fan-shaped, elliptical, crescent-shaped or arcuate shape, such as an arc having a curved surface, that is, it is only required to ensure that the outer surface of the connecting portion is curved. can.

The tabs in the above embodiments can be used as the positive electrode tabs and/or the negative electrode tabs of the battery. Referring specifically to FIG. 3 and FIG. 4, FIG. 3 is a schematic view of the first embodiment of the cylindrical battery of the present invention, FIG. A schematic view of a second embodiment of the invention of a cylindrical battery. The electrode portion of the positive electrode tab 31 and the electrode portion of the negative electrode tab 32 of the cylindrical battery 30 shown in Fig. 3 protrude as the electrode of the battery from the end of the cylindrical battery 30; the positive electrode tab of the cylindrical battery 40 shown in Fig. 4 The anode electrode 42 and the negative electrode tab 42 are flush with the end of the cylindrical battery 40 as the electrode of the battery, and the volume and space occupied by the cylindrical battery 40 can be reduced.

In the present embodiment, FIG. 4 is taken as an example for description, wherein the electrode portion material of the positive electrode tab 41 is an alloy of one or more materials of aluminum, iron, titanium, or the electrode portion of the positive electrode tab 41. The substrate of the material is one of aluminum, stainless steel or titanium alloy, and the plating layer is one or more of aluminum, stainless steel or titanium alloy, and the substrate is different from the plating material; the electrode portion of the negative electrode tab 42 is made of copper, One of the materials of iron, titanium or carbon or an alloy of a plurality of materials, or the base material of the electrode portion of the negative electrode tab 42 is one of copper, copper alloy, stainless steel, titanium alloy or carbon, and the plating layer is copper or copper. One or more of alloy, stainless steel, titanium alloy or carbon, and the substrate is different from the plating material.

Continuing with FIG. 4 as an example, in order to facilitate the user to distinguish the polarity of the electrode portion of the cylindrical battery 40, the electrode portions of the positive electrode tab 41 electrode portion and the negative electrode tab 42 may be set to different shapes. The polarity of the electrode of the cylindrical battery 40 is distinguished. In another embodiment, in order to facilitate the user to distinguish the polarity of the electrode portions of the positive electrode tab 41 electrode portion and the negative electrode tab 42 of the cylindrical battery 40, the electrode of the positive electrode tab 41 electrode portion and the negative electrode tab 42 The portions are arranged in different diameters for distinguishing the polarity of the electrodes of the cylindrical battery 40. In other embodiments, in order to distinguish the polarity of the electrode portions of the positive electrode tab 41 electrode portion and the negative electrode tab 42 of the cylindrical battery 40, the electrode portions of the positive electrode tab 41 electrode portion and the negative electrode tab 42 may be further included. The mark is set to a different color or a mark of "+" or "-" is engraved on the electrode portion, which is not limited herein. The electrode portions of the positive electrode tab 41 and the negative electrode tab 42 are flush with the end of the cylindrical battery 40 as the electrode of the cylindrical battery 40, and the volume of the cylindrical battery 40 can be reduced.

5 and FIG. 6, FIG. 5 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of FIG. 3, and FIG. 6 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of FIG. The battery core of the cylindrical battery shown in FIG. 5 includes a positive electrode tab 31, a negative electrode tab 32, a positive electrode tab 33, a negative electrode tab 34 and a diaphragm 35; the battery core of the cylindrical battery shown in FIG. 6 includes a positive electrode tab 41, negative The electrode tab 42, the positive electrode tab 43, the negative electrode tab 44, and the separator 45. In the present embodiment, the connection between the positive electrode tab 41 and the positive electrode tab 43 is electrically connected, the connection portion of the negative electrode tab 42 and the negative electrode tab 44 are electrically connected, and the diaphragm 45 is disposed on the positive electrode tab. 43 and the negative electrode sheet 44. The positive electrode sheet 43, the separator 45, and the negative electrode sheet 44 are wound around the outer surface of the joint portion of the positive electrode tab 41 and the outer surface of the joint portion of the negative electrode tab 42 to form a battery cell in which the pole piece and the tab are closely attached. The connecting portion of the positive electrode tab 41 and the connecting portion of the negative electrode tab 42 are gradually thinned from the center to the both sides in the circumferential direction, and the hollow space can be completely or partially filled after the pole piece is wound, so that the hollow space is reduced. Small, thereby increasing the space utilization of the cylindrical battery. Further, the positive electrode tab 41 and the negative electrode tab 42 are disposed inside the cylindrical battery, and the electrode portion of the positive electrode tab 41 and the electrode portion of the negative electrode tab 42 are flush with the end of the cylindrical battery, and can be reduced. Small battery footprint.

4 and 6, the electrode portion of the positive electrode tab 41 of the cylindrical battery 40 and the electrode portion of the negative electrode tab 42 are disposed at the same end of the cylindrical battery 40. The battery cell is housed inside the outer casing of the cylindrical battery 40, and an electrically insulating chassis is disposed between the battery core and the bottom of the cylindrical battery 40 to prevent contact between the battery core and the bottom of the cylindrical battery 40. The battery core and the cylindrical battery 40 are surrounded by the outer casing. An electrically insulating material is provided between the cells to prevent contact with the periphery of the outer casing of the cylindrical battery 40. The electrode portion of the positive electrode tab 41 and the electrode portion of the negative electrode tab 42 are disposed at the same end of the cylindrical battery 40, and one end portion of the cylindrical battery 40 is sealed with a wafer so that the electrode portion of the positive electrode tab 41 and the negative portion The electrode portion of the electrode tab 42 is flush with the outer surface of the wafer, and the electrode portion of the positive electrode tab 41 and the electrode portion of the negative electrode tab 42 are electrically isolated from the wafer by a plastic material or a ceramic material, and finally The electrode portion of the electrode tab 41 and the electrode portion of the negative electrode tab 42 are flush with the outer end portion of the cylindrical battery 40.

7 and FIG. 8, FIG. 7 is a schematic view of a third embodiment of a cylindrical battery of the present invention, and FIG. 8 is a schematic view of a fourth embodiment of the cylindrical battery of the present invention. The electrode portion of the positive electrode tab 71 and the negative electrode tab 72 of the cylindrical battery 70 shown in FIG. 7 are disposed at both ends of the cylindrical battery 70, protruding from the end of the cylindrical battery 70; the cylindrical battery shown in FIG. The electrode portion of the positive electrode tab 81 and the electrode portion of the negative electrode tab 82 of the 80 are disposed at both ends of the cylindrical battery 80, flush with the end portion of the cylindrical battery 80, and the volume and space occupied by the cylindrical battery can be reduced. 9 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of FIG. 7, and FIG. 10 is a cross-sectional view showing an embodiment of the winding of the battery of the cylindrical battery of FIG. The battery core of the cylindrical battery shown in FIG. 9 includes a positive electrode tab 71, a negative electrode tab 72, a positive electrode tab 73, a negative electrode tab 74 and a diaphragm 75; the battery core of the cylindrical battery shown in FIG. 10 includes a positive electrode tab 81, negative The electrode tab 82, the positive electrode tab 83, the negative electrode tab 84, and the separator 85. In the present embodiment, the description will be made with reference to FIGS. 8 and 10, and it is necessary to seal both end portions of the cylindrical battery 80 with two wafers, and then the electrode portions of the positive electrode tab 81 and the electrode of the negative electrode tab 82. The portions are electrically isolated from the two wafers by a plastic material or a ceramic material and sealed to both ends of the cylindrical battery, and finally the electrode portions of the positive electrode tab 81 and the electrode portion of the negative electrode tab 82 and the outer shell of the cylindrical battery 80 are respectively The ends are flush.

The beneficial effects of the present invention are: different from the prior art, in the present invention, the outer surface of the tab connection portion is provided with a curved surface, which can ensure the close contact between the tab and the pole piece when forming the battery cell Further, since the connecting portion is gradually thinned from the center to the both sides in the circumferential direction, the hollow portion is completely or partially filled with the middle portion of the connecting portion after the pole piece is wound, so that the hollow portion is hollowed out. The gap is reduced, thereby increasing the space utilization of the battery.

The above description is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structural transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, is the same. The scope of the invention is included in the scope of the patent protection of the present invention.

Claims (20)

1. A pole for a cylindrical battery, wherein the cylindrical battery is provided with a pole piece, wherein the tab includes an electrode portion and a connecting portion, and the electrode portion is electrically connected to the pole piece through the connecting portion Connecting, the connecting portion is wound with the pole piece, and completely or partially fills a hollow gap after the pole piece is wound, and an outer surface of the connecting portion and the pole piece is an arc The surface is brought into close contact with the pole piece and wound.
2. The tab according to claim 1, wherein the electrode portion is flush with an end of the cylindrical battery.
3. The tab according to claim 1, wherein the connecting portion has a semicircular cross section, a sector shape, a crescent shape or an arc shape, and the electrode portion has a circular or elliptical cross section.
4. The tab of claim 1 wherein said tab includes a positive electrode tab and a negative electrode tab.
5. The tab according to claim 4, wherein the electrode portion material of the positive electrode tab is an alloy of one or more materials of aluminum, iron, titanium; and the electrode portion material of the negative electrode tab It is an alloy of one or more materials of copper, iron, titanium, and carbon.
6. The tab according to claim 4, wherein the base material of the electrode portion of the positive electrode tab is one of aluminum, stainless steel or titanium alloy, and the plating layer is one of aluminum, stainless steel or titanium alloy or a plurality of, and the substrate is different from the plating material; the substrate of the electrode portion material of the negative electrode tab is one of copper, copper alloy, stainless steel, titanium alloy or carbon, and the plating layer is copper or copper alloy. One or more of stainless steel, titanium alloy or carbon, and the substrate is different from the plating material.
7. The tab according to claim 4, wherein the electrode portion of the positive electrode tab and the negative electrode tab electrode portion have different shapes or different diameters.
8. The tab according to claim 4, wherein said positive electrode tab and said negative electrode tab are respectively disposed at both ends of said cylindrical battery.
9. The tab according to claim 4, wherein said positive electrode tab and said negative electrode tab are disposed at the same end of said cylindrical battery.
10. The tab according to claim 1, wherein the electrode portion is sealed to the end of the cylindrical battery by a plastic material or a ceramic material.
11. A cylindrical battery, comprising:

    a battery core formed by winding a pole piece and a diaphragm;

    a housing that houses the battery core;

    a tab, the tab includes an electrode portion and a connecting portion, the electrode portion is electrically connected to the pole piece through the connecting portion, the connecting portion is wound with the pole piece, and the pole piece is wound After the winding, the hollow space is completely or partially filled, and the outer surface of the connecting portion and the pole piece is curved, so that the connecting portion and the pole piece are closely fitted and wound.
12. The cylindrical battery according to claim 11, wherein the electrode portion is flush with an end of the cylindrical battery.
13. The cylindrical battery according to claim 11, wherein the connecting portion has a semicircular cross section, a sector shape, a crescent shape or an arc shape, and the electrode portion has a circular or elliptical cross section.
14. The cylindrical battery according to claim 11, wherein said tab includes a positive electrode tab and a negative electrode tab.
15. The cylindrical battery according to claim 14, wherein the electrode portion material of the positive electrode tab is an alloy of one or more materials of aluminum, iron, titanium; and the electrode portion material of the negative electrode tab It is an alloy of one or more materials of copper, iron, titanium, and carbon.
16. The cylindrical battery according to claim 14, wherein the base material of the electrode portion of the positive electrode tab is one of aluminum, stainless steel or titanium alloy, and the plating layer is one of aluminum, stainless steel or titanium alloy or a plurality of, and the substrate is different from the plating material; the substrate of the electrode portion material of the negative electrode tab is one of copper, copper alloy, stainless steel, titanium alloy or carbon, and the plating layer is copper or copper alloy. One or more of stainless steel, titanium alloy or carbon, and the substrate is different from the plating material.
17. The cylindrical battery according to claim 14, wherein the electrode portion of the positive electrode tab and the negative electrode tab electrode portion have different shapes or different diameters.
18. The cylindrical battery according to claim 14, wherein said positive electrode tab and said negative electrode tab are respectively disposed at both ends of said cylindrical battery.
19. The cylindrical battery according to claim 14, wherein said positive electrode tab and said negative electrode tab are disposed at the same end of said cylindrical battery.
20. The cylindrical battery according to claim 11, wherein the electrode portion is sealed to the end of the cylindrical battery by a plastic material or a ceramic material.