Positive electrode gasket and negative electrode gasket for mounting cylindrical lithium battery tabs

Abstract

The utility model provides a pole lug positive gasket and a pole lug negative gasket for mounting a cylindrical lithium battery, the pole lug positive gasket comprises a positive gasket body, a pole lug through hole is arranged on the positive gasket body, and the width of the pole lug through hole is 4-9 times of the thickness of a pole lug wrapped with an insulating layer. The tab negative gasket comprises a negative gasket body, a third round hole is formed in the center of the negative gasket body, more than two tab through hole bodies which are circumferentially and uniformly arranged are arranged on the outer side of the third round hole, and a second separation part is arranged between the third round hole and the tab through hole bodies. A third separation part is arranged between the tab through hole bodies, the tab through hole bodies comprise a fourth tab through hole and a fifth tab through hole, and a fourth separation part is arranged between the fourth tab through hole and the fifth tab through hole. According to the structure disclosed by the utility model, the tabs can conveniently penetrate through the tab gaskets, so that the lithium battery can be quickly assembled, and the flatness of the tab gaskets is good after the tabs are bent.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a positive electrode pad and a negative electrode pad for mounting cylindrical lithium battery tabs. Background Technology

[0002] Cylindrical lithium batteries possess advantages such as high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, electrochemical stability, safety during use, and a wide operating temperature range, leading to their widespread application in various fields. A cylindrical lithium battery comprises a wound cell, a negative electrode pad mounted on the underside of the wound cell, and a positive electrode pad mounted on the topside of the wound cell. Both the positive and negative electrode pads are made of insulating material and have tab through-holes to facilitate connection between the tabs and the wound cell.

[0003] For example, Chinese Patent No. 20232061349.1, published on September 15, 2023, discloses a negative electrode pad for a cylindrical lithium battery, including an insulating pad body. The insulating pad body is circular in shape. A first tab through hole is opened on one side of the insulating pad body, and a second tab through hole is opened on the other side. The first tab through hole and the second tab through hole are both fan-shaped. The center of the first tab through hole and the second tab through hole are at the same point as the center of the insulating pad body. The distance between the second tab through hole and the center is greater than the distance between the first tab through hole and the center. The axis of symmetry of the first tab through hole and the axis of symmetry of the second tab through hole are on the same straight line as the center of the insulating pad body.

[0004] The aforementioned literature describes a method where different tab through-holes are provided on both sides of the insulating pad body, allowing the tabs connected to the wound battery core to be connected together from both sides of the insulating pad body. However, due to the difference in the position of the tabs on the wound battery core, the position of the tabs cannot be guaranteed after the battery core is wound, thus making it impossible for the position of the tabs to correspond with the position of the tab through-holes. This makes it inconvenient for the tabs to pass through the pad. In addition, when the tabs are bent, the negative electrode pad is easily warped. Utility Model Content

[0005] The primary objective of this invention is to provide a positive electrode pad for installing cylindrical lithium battery tabs, facilitating the passage of the tab through the positive electrode pad, enabling rapid assembly of the lithium battery, and ensuring good flatness of the positive electrode pad after the tab is bent.

[0006] The second objective of this invention is to provide a negative electrode pad for mounting cylindrical lithium battery tabs, which is compatible with the positive electrode pad of the cylindrical lithium battery tab. This facilitates the tab passing through the negative electrode pad, enabling rapid assembly of the lithium battery, and ensures good flatness of the negative electrode pad after the tab is bent.

[0007] To achieve the above-mentioned first object, the utility model provides a kind of for installing cylindrical lithium battery tab positive pad, including positive pad body, and positive pad body is equipped with tab through-hole, the width of tab through-hole is 4~9 times of the thickness of positive tab after wrapping insulation layer.

[0008] The above structure, tab through-hole provides enough space for the passing of tab, facilitates the passing of tab, can realize the purpose of quickly assembling lithium battery, and after the bending of positive tab, avoid the first separation part due to the width of tab through-hole is too small and is squeezed, in turn, lead to the convex phenomenon of positive pad body after the bending of positive tab, so as to affect the flatness of positive pad;In addition, if tab through-hole is too large, the entity part of positive pad body is reduced, which will affect the strength of positive pad body, if tab through-hole is too small, it will affect the smooth passing of tab.

[0009] Further, tab through-hole includes tab through-hole one, tab through-hole two and tab through-hole three, tab through-hole one, tab through-hole two and tab through-hole three are all arranged in fan shape, tab through-hole one is located at one side of positive pad body center line, tab through-hole two and tab through-hole three are located at the other side of positive pad body center line, and first separation part is arranged between tab through-hole two and tab through-hole three.

[0010] The structure, due to the fan-shaped arrangement of tab through-hole one, tab through-hole two and tab through-hole three, and tab through-hole one and tab through-hole two, tab through-hole three are located at both sides of positive pad body center line respectively, so that the positive tab connected to the battery cell can pass through the tab through-hole at any position after the winding of battery cell, thereby avoiding the positive tab connected to the battery cell after the winding of battery cell, which is just located between the tab through-hole and cannot pass through the tab through-hole, and by arranging the first separation part, the positive tab located on the same side can be separated.

[0011] Further, the width of tab through-hole one is 6~9 times of the thickness of positive tab after wrapping insulation layer, and the width of tab through-hole two and tab through-hole three is 4~9 times of the thickness of positive tab after wrapping insulation layer.

[0012] Further, tab through-hole one, tab through-hole two and tab through-hole three are all arranged in 180° fan shape.

[0013] Further, the center position of the positive pad body is provided with a circular hole one, and the center of the circular hole one is located on the center line of the positive pad body, and the centers of the fan-shaped tab through-hole one, tab through-hole two and tab through-hole three coincide with the center of the circular hole one.

[0014] Further, two or more circular holes two are arranged uniformly around the circular hole one and the tab through-hole one.

[0015] The above arrangement facilitates the electrolyte to pass through the positive pad body through the round hole one and the round hole two.

[0016] Further, the distance from the tab through hole one to the center of the round hole one is less than the distance from the tab through hole three to the center of the round hole one, and the distance from the tab through hole two to the center of the round hole one is less than the distance from the tab through hole one to the center of the round hole one.

[0017] The above arrangement can accommodate the tab passing through the tab through hole with different distances from the center of the round hole one.

[0018] To achieve the above-mentioned second object, a negative tab pad for installing cylindrical lithium battery positive tab includes a negative pad body, the center of which is provided with a round hole three, and the outer side of the round hole three is provided with two or more tab through hole bodies arranged uniformly in a circle, a second separation part is arranged between the round hole three and the tab through hole body, a third separation part is arranged between the tab through hole bodies, the tab through hole body includes a tab through hole four and a tab through hole five, a fourth separation part is arranged between the tab through hole four and the tab through hole five, and the width of the tab through hole four and the tab through hole five is 6-9 times the thickness of the negative tab after wrapping the insulation layer.

[0019] Further, the tab through hole four and the tab through hole five are both arranged in a fan shape and the fan angle is 120°, and the distance from the tab through hole four to the center of the round hole three is less than the distance from the tab through hole five to the center of the round hole three.

[0020] The above arrangement, since the fan angle of the tab through hole four and the tab through hole five is arranged as 120°, and the tab through hole body is arranged uniformly in a circle on the outer side of the round hole three, so that after the winding of the battery cell, the negative tab connected to the battery cell can pass through the tab through hole four or the tab through hole five, and the width of the tab through hole four and the tab through hole five is set according to the thickness of the negative tab, so that when multiple negative tabs pass through the tab through hole four or the tab through hole five, since the tab through hole four and the tab through hole five have enough accommodation space, and further, after the negative tab is bent, it can avoid the phenomenon that the tab through hole four or the tab through hole five is too small to squeeze the fourth separation part, thereby causing the negative pad body to be convex after the negative tab is bent, thereby affecting the flatness of the negative pad. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a top view of the positive tab pad in the utility model.

[0022] Figure 2 It is a top view of the positive tab passing through the positive tab pad in the utility model.

[0023] Figure 3 It is a top view of the negative tab pad in the utility model.

[0024] Figure 4 Figure 6 is a plan view of the negative tab passing through the negative tab gasket in the utility model. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0026] Example 1.

[0027] As shown in Figure 1 and Figure 2 A positive tab gasket for installing cylindrical lithium battery includes a positive gasket body a1, which is circularly arranged, a circular hole one a2 is arranged at the center position of the positive gasket body a1, the center of the circular hole one a2 is located on the center line a3 of the positive gasket body a1, a tab through hole is arranged on the positive gasket body a1, the tab through hole includes a tab through hole one a4, a tab through hole two a5 and a tab through hole three a6, which are arranged in a fan shape and the fan angle is 180°, the tab through hole one a4 is located on one side of the positive gasket body center line a3, the tab through hole two a5 and the tab through hole three a6 are located on the other side of the positive gasket body center line a3, so that the positive tab a7 connected to the battery can pass through the tab through hole at any position after winding, thereby avoiding the positive tab a7 connected to the battery after winding, which is located between the tab through hole and cannot pass through the tab through hole, a first separation part a8 is arranged between the tab through hole two a5 and the tab through hole three a6, and the positive tab a7 on the same side is separated by arranging the first separation part a8, and after the positive tab a7 is bent, the insulating layer a9 wrapped outside the positive tab a7 is prevented from directly abutting against the wound battery exposed in the tab through hole, so that the insulating layer a9 is protected, the centers of the tab through hole one a4, the tab through hole two a5 and the tab through hole three a6 arranged in a fan shape coincide with the center of the circular hole one a2, more than two circular hole two a10 arranged uniformly in a circle are arranged between the circular hole one a2 and the tab through hole one a4, in this embodiment, the circular hole two a10 is arranged as six, the diameter of the circular hole one a2 is larger than the diameter of the circular hole two a10, so that the electrolyte can pass through the positive gasket body a1 through the circular hole one a2 and the circular hole two a10.

[0028] The distance from the tab through hole one a4 to the center of the round hole one a2 is less than the distance from the tab through hole three a6 to the center of the round hole one a2, and the distance from the tab through hole two a5 to the center of the round hole one a2 is less than the distance from the tab through hole one a4 to the center of the round hole one a2, so that the positive tab a7 with different distances from the center of the round hole one a2 can be accommodated through the tab through hole, the width of the tab through hole one a4 is 6-9 times the thickness of the positive tab a7 after being wrapped with the insulating layer a9, and the width of the tab through hole two a5 and the tab through hole three a6 is 4-9 times the thickness of the positive tab a7 after being wrapped with the insulating layer a9. In this embodiment, the width of the tab through hole one a4 is 9 times the thickness of the positive tab a7 after being wrapped with the insulating layer a9, and the width of the tab through hole two a5 and the tab through hole three a6 is 8 times the thickness of the positive tab a7 after being wrapped with the insulating layer a9. The width of the tab through hole is set according to the thickness of the positive tab a7, so that when the positive tab a7 is located on the same side, the tab through hole can have enough space for the positive tab a7 to pass through, and after the positive tab a7 is bent, the bending part of the positive tab a7 does not give the positive pad body an upward force to cause the positive pad body to warp, thereby affecting the flatness of the positive pad. If the above multiple relationship is adopted, if the tab through hole is too large, the solid part of the positive pad body is reduced, which will affect the strength of the positive pad body, and if the tab through hole is too small, it will affect the smooth passing of the tab.

[0029] Embodiment 2.

[0030] As Figures 3-4As shown, a negative pad for mounting cylindrical lithium battery tab, including negative pad body a11, the negative pad body a11 is circularly arranged, the diameter of the negative pad body a11 matches the positive pad body a1, the negative pad body a11 includes a circular hole three a12 at the center position, more than two tab through hole bodies a19 are arranged uniformly on the outer side of the circular hole three a12, a second separation part a13 is arranged between the circular hole three a12 and the tab through hole body a19, a third separation part a14 is arranged between the tab through hole body a19 and the tab through hole body a19, the tab through hole body a19 includes a tab through hole four a15 and a tab through hole five a16, the centers of the tab through hole four a15 and the tab through hole five a16 coincide with the center of the circular hole three a12, the tab through hole four a15 and the tab through hole five a16 are arranged in a fan shape and the fan angle is 120°, a fourth separation part a17 is arranged between the tab through hole four a15 and the tab through hole five a16, so that the negative tab a18 connected to the battery cell can pass through the tab through hole four a15 or the tab through hole five a16 after winding, the distance from the tab through hole four a15 to the center of the circular hole three a12 is less than the distance from the tab through hole five a16 to the center of the circular hole three a12, so as to accommodate the negative tab a18 with different distances from the center of the circular hole three a12 to pass through the tab through hole four a15 or the tab through hole five a16, the width of the tab through hole four a15 and the tab through hole five a16 is 6-9 times the thickness of the negative tab a18 after wrapping the insulation layer a9, in this embodiment, the width of the tab through hole four a15 and the tab through hole five a16 is 7 times the thickness of the negative tab a18 after wrapping the insulation layer a9, so that when multiple negative tabs a18 pass through the tab through hole four a15 or the tab through hole five a16, due to the sufficient accommodation space of the tab through hole four a15 and the tab through hole five a16, after the negative tab a18 is bent, the negative pad body can be avoided to be squeezed due to the too small width of the tab through hole four a15 or the tab through hole five a16, so as to cause the negative pad body to be convex after the negative tab a18 is bent, thereby affecting the flatness of the negative pad. If the tab through hole is too large, the solid part of the negative pad body is reduced, which will affect the strength of the negative pad body, if the tab through hole is too small, it will affect the smooth passing of the tab.

Claims

1. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab, characterized by: The positive electrode gasket body is provided with a tab through hole, and the width of the tab through hole is 4-9 times the thickness of the positive electrode tab after wrapping the insulating layer.

2. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 1, characterized in that: The tab through hole includes a first tab through hole, a second tab through hole and a third tab through hole, and the first tab through hole, the second tab through hole and the third tab through hole are arranged in a fan shape, the first tab through hole is located on one side of the center line of the positive electrode gasket body, the second tab through hole and the third tab through hole are located on the other side of the center line of the positive electrode gasket body, and a first separation part is arranged between the second tab through hole and the third tab through hole.

3. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 2, wherein: The width of the first tab through hole is 6-9 times the thickness of the positive electrode tab after wrapping the insulating layer, and the width of the second tab through hole and the third tab through hole is 4-9 times the thickness of the positive electrode tab after wrapping the insulating layer.

4. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 2, wherein: The first tab through hole, the second tab through hole and the third tab through hole are all arranged in a 180° fan shape.

5. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 2, wherein: The center of the first tab through hole, the second tab through hole and the third tab through hole is arranged in a fan shape, and the center of the first tab through hole, the second tab through hole and the third tab through hole is coincided with the center of the first circular hole.

6. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 5, wherein: The first circular hole and the first tab through hole are provided with two or more circular holes arranged uniformly in a circle.

7. A cylindrical lithium battery tab positive gasket for mounting a cylindrical lithium battery tab according to claim 5, wherein: The distance from the first tab through hole to the center of the first circular hole is less than the distance from the third tab through hole to the center of the first circular hole, and the distance from the second tab through hole to the center of the first circular hole is less than the distance from the first tab through hole to the center of the first circular hole.

8. A cylindrical lithium battery tab negative gasket for mounting a cylindrical lithium battery tab, characterized by: The negative electrode gasket body includes a first circular hole arranged at the center, two or more tab through hole bodies arranged uniformly in a circle outside the first circular hole, a second separation part arranged between the first circular hole and the tab through hole body, a third separation part arranged between the tab through hole bodies, a fourth separation part arranged between a fourth tab through hole and a fifth tab through hole, and the width of the fourth tab through hole and the fifth tab through hole is 6-9 times the thickness of the negative electrode tab after wrapping the insulating layer.

9. A negative gasket for mounting cylindrical lithium battery tabs according to claim 8, characterized in that: The fourth tab through hole and the fifth tab through hole are arranged in a fan shape and the fan angle is 120°, and the distance from the fourth tab through hole to the center of the first circular hole is less than the distance from the fifth tab through hole to the center of the first circular hole.

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