Positive pole piece of nickel-metal hydride battery and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a nickel-metal hydride battery positive pole piece and a battery. The positive pole piece of the nickel-metal hydride battery comprises a base material, an active material area and a net position buffer area located on one side of the active material area are formed on the base material, a tab belt is welded to the net position buffer area, an insulating layer is pasted to the tab belt, the insulating layer at least covers part of the inner side edge of the tab belt in the width direction, and the outer side edge of the tab belt is provided with a gap between the active material area and the net position buffer area. And at least part of the net bit buffer area is covered. By adopting the mode, the stability of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially a nickel hydrogen battery positive pole piece and battery. BACKGROUND

[0002] The pole piece of the battery is the core component of the battery, and its structure greatly influences the capacity and safety performance of the battery. The pole piece of the battery comprises a base material and active material coated on the opposite sides of the base material. There is an empty foil area (i.e. the base material is not coated with active material) on one side of the pole piece to facilitate welding of the tab to lead out current.

[0003] In order to realize high-power discharge, some existing batteries adopt a full-tab structure, especially for full-tab nickel hydrogen batteries. The tab is a whole nickel-plated steel strip, and the nickel-plated steel strip is arranged in the empty foil area by ultrasonic welding to serve as a current collector and welding medium. However, this may cause the welding part to crack during later winding of the pole piece. In addition, burrs or sharp corners exist on the edges of the nickel-plated steel strip, which may scratch or pierce the separator during winding, leading to short circuit and affecting the stability of the battery. SUMMARY

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a nickel hydrogen battery positive pole piece and battery, which can improve the stability of the battery.

[0005] The utility model discloses a kind of nickel hydrogen battery positive pole pieces, comprising: base material, the active material area is formed on the base material, and the net position buffer area in the active material area side, the tab band is welded on the net position buffer area, the tab band and the net position buffer area are pasted with insulating layer, and the insulating layer at least covers part of the inside edge of the tab band in width direction, and at least covers part of the net position buffer area.

[0006] Optionally, the base material is a foamed nickel base material.

[0007] Optionally, the connection of the two ends of the length of the tab band and the net position buffer area is respectively provided with a notch, and the insulating layer covers the notch in the length direction.

[0008] Optionally, the side of the tab band away from the active material area is flush with the edge of the net position buffer area.

[0009] Optionally, the side of the tab band close to the active material area has a preset distance from the active material area.

[0010] Optionally, the length of the preset distance ranges from 1.5 mm to 2 mm.

[0011] Optionally, the distance between the side of the tab band away from the active material area and the outer side edge of the insulating layer is greater than or equal to 1mm.

[0012] Optionally, the distance between the inner side edge of the insulating layer and the active material area is greater than or equal to 1mm.

[0013] Optionally, the thickness of the tab band is 0.1mm to 0.15mm.

[0014] Optionally, the shape of the notch is a stepped shape.

[0015] Optionally, the thickness of the insulating layer is 0.09mm to 0.1mm.

[0016] The utility model discloses still a kind of battery, including the nickel-hydrogen battery positive pole sheet of any one described above.

[0017] Compared with prior art, the nickel-hydrogen battery positive pole sheet and the battery provided by the utility model embodiment have the beneficial effects that: the active material area is coated with corresponding active material, so that the final prepared battery can store electricity. The tab band welded on the mesh position buffer area provides the required structural strength for the mesh position buffer area, which facilitates the welding medium when connecting with the current collector in the later period and improves the reliability of the connection. To avoid the cracking problem between the tab band and the mesh position buffer area, an insulating layer is pasted on the tab band and the mesh position buffer area, and the insulating layer covers at least part of the inner side edge of the tab band and at least part of the mesh position buffer area in the width direction, so as to assist in bonding and fixing the tab band and the mesh position buffer area, thereby reducing the cracking probability of the welding position. In addition, the insulating layer can also cover and protect the burrs on the tab band, thereby reducing the probability of the diaphragm being pierced. At the same time, the insulating layer covers part of the tab band and part of the mesh position buffer area in the width direction, which does not affect the welding with the current collector and does not affect the performance of the active material layer, thereby being beneficial to improving the stability of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] The technical solutions of the utility model will be described in further detail below with reference to the drawings and examples, and in the drawings:

[0019] Figure 1 is the structural schematic diagram of the nickel-hydrogen battery positive pole sheet provided by the utility model embodiment;

[0020] Figure 2 is Figure 1 is a local enlarged schematic view of position A in FIG. 4;

[0021] Figure 3 is the structural schematic diagram of the cooperation of the base material and the tab band provided by the utility model embodiment;

[0022] Figure 4is a sectional view of a net position buffer area of a nickel-hydrogen battery positive electrode sheet.

[0023] Reference signs in the drawings are as follows:

[0024] 100, nickel-hydrogen battery positive electrode sheet; 110, base material; 112, active material area; 114, net position buffer area; 120, tab belt; 122, notch; 130, insulation layer. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Now, the preferred embodiments of the present application will be described in detail with reference to the drawings.

[0026] As Figures 1 to 4 shown, the embodiment of the present application provides a nickel-hydrogen battery positive electrode sheet 100, which comprises a base material 110, the base material 110 is formed with an active material area 112 and a net position buffer area 114 located on one side of the active material area 112, a tab belt 120 is welded on the net position buffer area 114, an insulation layer 130 is pasted on the tab belt 120, and the insulation layer 130 covers part of the tab belt 120 and part of the net position buffer area 114 in the width direction.

[0027] Specifically, the active material area 112 is used for coating corresponding active material, so as to facilitate the storage of the finally prepared battery. The tab belt 120 welded on the net position buffer area 114 provides the required structural strength for the net position buffer area 114, facilitates the welding medium when connecting with the current collector later, and improves the reliability of the connection. In order to avoid the cracking problem between the tab belt 120 and the net position buffer area 114, the insulation layer 130 is pasted on the tab belt 120 and the net position buffer area 114, and the insulation layer 130 covers part of the inner side edge of the tab belt 120 and part of the net position buffer area 114 in the width direction, so as to assist the bonding and fixing of the tab belt 120 and the net position buffer area 114, and reduce the cracking probability of the welding position. In addition, the insulation layer 130 can also cover and protect the burrs on the tab belt 120, and reduce the probability of the diaphragm being pierced. At the same time, the insulation layer 130 covers part of the tab belt 120 and part of the net position buffer area 114 in the width direction, which will not affect the welding with the current collector, and will not affect the performance of the active material layer, and is conducive to improving the stability of the battery.

[0028] It should be noted that in the embodiments of the present application, the tab belt 120 can adopt a nickel-plated steel belt, and the insulation layer 130 can adopt an insulating tape.

[0029] In an optional embodiment of the present application, the substrate 110 is a foamed nickel substrate. Specifically, the foamed nickel substrate is a kind of porous conductive material. During the charging and discharging process of the battery, the foamed nickel substrate can provide an efficient conduction channel for electrons. In addition, the pores of the foamed nickel substrate can adsorb the positive active material, so that the active material can be uniformly distributed on its surface and in the pores, and maintain a stable structure during subsequent use.

[0030] As shown in Figures 1 to 3 , the two ends of the length of the tab belt 120 are respectively provided with notches 122 at the connection with the mesh buffer area 114, and the insulating layer 130 covers the notches 122 in the length direction.

[0031] Specifically, the notches 122 are integrally stamped after the tab belt 120 is welded and connected with the mesh buffer area 114. By providing notches 122 at both ends of the length of the tab belt 120, during the winding process of the nickel-hydrogen battery positive plate 100, the end of the tab belt 120 can be prevented from being squeezed to the middle under stress, causing the middle region of the tab belt 120 to be cracked due to excessive stress. This is conducive to further reducing the cracking probability of the welding position of the tab belt 120 and the mesh buffer area 114. In addition, the insulating layer 130 covers the notches 122 in the length direction to completely cover the above-mentioned notches 122, which can shield the burrs or sharp corners at the edges of the tab belt 120, reduce the probability of piercing the diaphragm during winding, and improve the stability of the finally prepared battery.

[0032] In an optional embodiment of the present application, the shape of the notch 122 is a stepped shape. By adopting the above-mentioned form, the stress distribution during winding can be better adapted, the stress concentration at the connection position can be reduced, and the reliability and stability of the connection can be improved.

[0033] As shown in Figure 3 , the side of the tab belt 120 away from the active material area 112 is flush with the edge of the mesh buffer area 114.

[0034] Specifically, the side of the tab belt 120 away from the active material area 112 is flush with the edge of the mesh buffer area 114, which not only provides strength support to the mesh buffer area 114, but also serves as a welding medium when welding with the current collector, avoiding the problem of air welding during welding due to the thinness of the mesh buffer area 114 itself, which is conducive to ensuring the reliability of the welding.

[0035] In an optional embodiment of the present application, the side of the tab belt 120 close to the active material area 112 has a predetermined distance from the active material area 112.

[0036] Specifically, the side of the tab belt 120 close to the active material area 112 has a preset distance from the active material area 112, which not only prevents affecting the performance of the active material, but also provides a suitable space position for the connection operation of the tab belt 120, ensuring the firmness and stability of the connection.

[0037] In an optional embodiment of the present application, the length of the preset distance ranges from 1.5 mm to 2 mm. In this way, the overall compactness is improved, and the area occupied by the active material layer is increased as much as possible to improve the capacity of the battery, while meeting the safety required distance.

[0038] In an optional embodiment of the present application, the distance between the side of the tab belt 120 away from the active material area 112 and the outer side edge of the insulating layer 130 is greater than or equal to 1 mm.

[0039] With the above form, the side of the tab belt 120 away from the active material area 112 can normally be exposed and avoid being covered by the insulating layer 130, which not only avoids burning the insulating layer 130 when the tab belt 120 is welded with the current collector, but also ensures the reliability of the welding.

[0040] In an optional embodiment of the present application, the distance between the inner side edge of the insulating layer 130 and the active material area 112 is greater than or equal to 1 mm.

[0041] With the above method, the insulating layer 130 can be pasted on the tab belt 120 and the net buffer area 114 at the same time, and the insulating layer 130 can also avoid being too close to or covering the active material layer, which is beneficial to ensure the full play of the active material layer and the capacity of the battery.

[0042] In an optional embodiment of the present application, the thickness of the tab belt 120 is 0.1 mm to 0.15 mm. With the above thickness, the tab belt 120 can be made as thin as possible while ensuring the support strength of the tab belt 120, reducing the use of materials, and avoiding the tab belt 120 connection protruding from the active material layer, which is beneficial to ensure the flatness during winding. The thickness of the tab belt 120 can be 0.1 mm, 0.12 mm or 0.15 mm.

[0043] In an optional embodiment of the present application, the thickness of the insulating layer 130 is 0.09 mm to 0.1 mm.

[0044] Specifically, the insulating layer 130 has the above thickness, which not only plays an insulating role, but also ensures the structural strength and flexibility of the insulating layer 130, to ensure the stability of the pasted connection and the coverage of burrs, thereby improving the stability of the battery.

[0045] The utility model discloses a kind of batteries, including the nickel-metal hydride battery positive pole piece 100 in the aforementioned embodiment. The battery contains the same structure and beneficial effect with the nickel-metal hydride battery positive pole piece 100 in the aforementioned embodiment. The structure and beneficial effect of nickel-metal hydride battery positive pole piece 100 have been described in detail in the aforementioned embodiment, and here will not be repeated.

[0046] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, but not limit them. Those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some technical features. All these modifications and substitutions shall fall within the protection scope of the appended claims of the present application.

Claims

1. A positive electrode sheet for a nickel-metal hydride battery, characterized in that, include: A substrate having an active material region and a mesh buffer located on one side of the active material region, an electrode strip welded to the mesh buffer, an insulating layer adhered to the electrode strip and the mesh buffer, and the insulating layer covering at least the inner edge of the electrode strip and at least a portion of the mesh buffer in the width direction.

2. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, The substrate is a nickel foam substrate.

3. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, Notches are provided at the connection points between the two ends of the tab strip and the mesh buffer, and the insulating layer covers the notches in the length direction.

4. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, The side of the tab that is furthest from the active material region is flush with the edge of the mesh buffer zone.

5. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, The side of the tab closest to the active material area is at a predetermined distance from the active material area.

6. The positive electrode of a nickel-metal hydride battery according to claim 5, characterized in that, The preset distance has a length range of 1.5mm to 2mm.

7. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, The distance between the side of the tab away from the active material area and the outer edge of the insulating layer is greater than or equal to 1 mm.

8. The positive electrode of a nickel-metal hydride battery according to claim 7, characterized in that, The distance between the inner edge of the insulating layer and the active material region is greater than or equal to 1 mm.

9. The positive electrode of a nickel-metal hydride battery according to claim 1, characterized in that, The thickness of the tab is 0.1 mm to 0.15 mm.

10. The positive electrode of a nickel-metal hydride battery according to claim 3, characterized in that, The notch is stepped.

11. The positive electrode sheet of a nickel-metal hydride battery according to any one of claims 1-10, characterized in that, The thickness of the insulating layer is from 0.09 mm to 0.1 mm.

12. A battery, characterized in that, Including the nickel-metal hydride battery positive electrode sheet according to any one of claims 1-11.

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