CN219513134U

CN219513134U - Positive electrode sheet, electrode core and battery

Info

Publication number: CN219513134U
Application number: CN202320076946.0U
Authority: CN
Inventors: 李华; 余斌; 张海波; 刘金锁; 王莹辉; 唐彬
Original assignee: Shenzhen Highpower Technology Co Ltd
Current assignee: Shenzhen Highpower Technology Co Ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-08-11
Anticipated expiration: 2033-01-10

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a positive electrode plate, a electrode core and a battery, which comprise a positive electrode base material, an active layer, first gummed paper and second gummed paper; the first gummed paper is adhered to the end face of the lower end of the positive electrode substrate and the two side surfaces of the lower end of the positive electrode substrate, so that a blank area and a gummed layer area are formed on each side surface of the positive electrode substrate; the active layer is formed by coating active substances on the blank area; the two sides of the second gummed paper are bent to adhere to the three-sided outer surfaces of the first gummed paper. According to the positive electrode plate provided by the embodiment of the utility model, the first gummed paper and the second gummed paper which are arranged on the positive electrode base material are used for shielding burrs, so that the burrs on the positive electrode base material penetrate through the diaphragm in the battery, and the short circuit and micro short circuit phenomena are reduced.

Description

Positive electrode sheet, electrode core and battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a positive pole piece, a pole core and a battery.

Background

Nickel-metal hydride batteries are widely used in various fields such as energy storage, HEV consumer electronics, and the like with the advantages of wide temperature range, environmental friendliness, and high safety. With the continuous rise of the requirements of customers on product power, endurance and the like, the number of the electric cores in each battery pack is also increased.

When a certain cell in the battery pack is in short circuit or micro short circuit, the cell can be rapidly disabled in the repeated charge and discharge process, and the voltage is reduced to be lower than the average voltage or even reduced to be zero volt.

In the prior art, the battery pack is generally managed in a voltage monitoring mode, but only voltage monitoring and failure alarm can be achieved, and the occurrence of a single cell failure phenomenon cannot be fundamentally reduced.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: in the prior art, the management of the battery pack is generally performed in a voltage monitoring mode, but only voltage monitoring and failure alarm can be achieved, the problem that the failure phenomenon of a single battery core cannot be fundamentally reduced is solved, and the positive electrode plate, the electrode core and the battery are provided.

In order to solve the technical problems, the embodiment of the utility model provides a positive electrode plate, which comprises a positive electrode base material, an active layer, first gummed paper and second gummed paper;

the first gummed paper is adhered to the end face of one end of the positive electrode substrate and the two side surfaces of the end of the positive electrode substrate, so that a blank area and a gummed layer area are formed on each side surface of the positive electrode substrate;

the active layer is formed by an active substance coated on the blank area;

the second gummed paper is arranged on the outer surface of the first gummed paper.

Optionally, the thickness of the positive electrode substrate in the glue layer area is smaller than the thickness of the positive electrode substrate in the blank area.

Optionally, the first gummed paper is tightly adhered to the positive electrode substrate by external force compression, and the thickness of the combined body formed by the positive electrode substrate, the first gummed paper and the second gummed paper in the glue layer area is equal to or less than the thickness of the combined body formed by the positive electrode substrate and the active layer in the white space.

Optionally, the adhesive capacity of the first gummed paper is greater than the adhesive capacity of the second gummed paper.

Optionally, the first gummed paper is a masking tape.

Optionally, the second gummed paper is transparent gummed paper.

Optionally, the positive electrode substrate is a foam nickel article.

Optionally, the edge of the second gummed paper close to the blank area is located in the gummed layer area, so that the edges of the second gummed paper and the active layer close to each other are spaced apart from each other.

The embodiment of the utility model also provides a pole core, which comprises a negative pole piece, a diaphragm and the positive pole piece, wherein the diaphragm is arranged between the positive pole piece and the negative pole piece.

The embodiment of the utility model also provides a battery, which comprises the pole core and a battery shell, wherein the pole core is arranged in the battery shell, and the positive electrode base material in the glue layer area is close to the bottom wall of the battery.

According to the positive electrode plate provided by the embodiment of the utility model, the edge of one side of the positive electrode plate is adhered through the first adhesive paper, so that burrs on the positive electrode base material can be reduced to puncture a diaphragm in the battery, the short circuit phenomenon formed by contact between the positive electrode plate and the negative electrode plate is reduced, and the short circuit or micro short circuit phenomenon easily generated by the battery electrode core is fundamentally and directly reduced.

Drawings

Fig. 1 is an overall schematic view of a positive electrode sheet according to a first embodiment of the present utility model;

FIG. 2 is a schematic side view of a positive electrode sheet according to a first embodiment of the present utility model;

fig. 3 is a schematic top view of a positive electrode sheet according to a second embodiment of the present utility model.

Reference numerals in the specification are as follows:

1. a positive electrode base material; 11. a white area is reserved; 12. a glue layer area; 2. an active layer; 3. a first gummed paper; 4. and a second gummed paper.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

First embodiment

As shown in fig. 1 to 3, the positive electrode sheet provided in the first embodiment of the present utility model includes a positive electrode substrate 1, an active layer 2, a first gummed paper 3, and a second gummed paper 4. The first gummed paper 3 is arranged at the edge of the lower end on the surface of the positive electrode substrate 1, two sides of the width of the first gummed paper 3 are respectively adhered to the two side surfaces of the positive electrode substrate 1, and the middle part of the first gummed paper 3 is adhered to the surface of the lower end of the positive electrode substrate 1, so that the surface of the positive electrode substrate 1 is divided into a blank area 11 and a glue layer area 12, and the end is directly wrapped by the first gummed paper 3 on one side of the positive electrode substrate 1 in actual operation. The active layer 2 is formed by applying an active material to the positive electrode substrate 1 in the blank region 11. In this embodiment, the second gummed paper 4 is attached to the three outer surfaces of the first gummed paper 3, and in some cases, the second gummed paper 4 may be attached to only one outer surface of the first gummed paper 3.

When the positive electrode plate is produced, the first gummed paper 3 is rolled by utilizing rolling equipment, so that the surface of the first gummed paper 3 is smooth, and the first gummed paper 3 is tightly adhered to the positive electrode base material 1. And the surface of the first gummed paper 3 after rolling is flat, so that the second gummed paper 4 is fast adhered and the phenomenon that the second gummed paper 4 is separated from the first gummed paper 3 is reduced.

The first gummed paper 3 is compressed and attached to the surface of the lower end of the positive electrode base material 1 by a rolling device, or is attached to the surface of the positive electrode base material 1 in the gummed layer area 12, at this time, the thickness of the combined body formed by the positive electrode base material 1 in the gummed layer area 12, the first gummed paper 3 and the second gummed paper 4 is equal to or less than the thickness of the combined body formed by the active layer 2 and the positive electrode base material 1 in the blank area 11. This arrangement makes the surface of the positive pole piece as flat as possible, and the resulting battery core does not occupy an excessive volume when wound or stacked, as compared to the glue layer region 12 protruding from the blank region 11.

In the present embodiment, the thickness of the positive electrode substrate 1 in the glue layer region 12 is smaller than the thickness of the positive electrode substrate 1 in the blank region 11. The adhesive capacity of the first gummed paper 3 is greater than the adhesive capacity of the second gummed paper 4. The second gummed paper 4 does not need a rolling device to press the second gummed paper 4 and the first gummed paper 3, and when the second gummed paper 4 is attached, only the second gummed paper 4, the positive electrode substrate 1 and the first gummed layer are slightly clamped by a clamp.

In this embodiment, the first gummed paper 3 is a masking tape, and the second gummed paper 4 is a transparent gummed paper. The positive electrode substrate 1 is a foamed nickel product. The masking tape has the short-circuit prevention function, and meanwhile, the phenomenon that the foam nickel ground burrs pierce the diaphragm to contact the negative electrode to cause short circuit can be greatly reduced by combining the transparent adhesive tape.

When the battery finished product is practically applied, the glue layer area 12 is close to the bottom wall of the battery, the blank area 11 is close to the top end of the battery, the positive electrode plate expands, and the active material of the active layer 2 falls off; because the second gummed paper 4 has small bonding capability and can be slightly opened in an alkaline environment, the second gummed paper 4 can catch the active substances on the blank area 11 at the moment and can not fall into the bottom of the battery to contact with the negative electrode to form a loop, so that the occurrence of short circuit and micro short circuit is greatly reduced.

The edge of the second gummed paper 4 close to the blank area 11 is located in the gummed layer area 12, so that the edges of the second gummed paper 4 and the active layer 2 close to each other are arranged at intervals. If the dimensions of the second gummed paper 4 and the first gummed paper 3 are identical, when the second gummed paper 4 is provided, it is very easy for the second gummed paper 4 to cover part of the active layer 2, thereby affecting the energy density of the battery.

Second embodiment

The third embodiment of the utility model also provides a pole core, which comprises the positive pole piece of the first embodiment; in this embodiment, the pole core may be a coiled pole core or a laminated pole core.

Third embodiment

The fourth embodiment of the present utility model also provides a battery, including the electrode core and the battery case in the second embodiment, the electrode core is disposed in the battery case, and the positive electrode substrate 1 of the glue layer area 12 is close to the bottom wall of the battery case.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The positive electrode plate is characterized by comprising a positive electrode base material, an active layer, first gummed paper and second gummed paper;

the active layer is formed by an active substance coated on the blank area;

2. The positive electrode sheet of claim 1, wherein the thickness of the positive electrode substrate in the glue line region is less than the thickness of the positive electrode substrate in the blank region.

3. The positive electrode sheet according to claim 2, wherein the first adhesive sheet is tightly adhered to the positive electrode base material by external force compression, and the thickness of the combination of the positive electrode base material in the adhesive layer region, the first adhesive sheet, and the second adhesive sheet is equal to or smaller than the thickness of the combination of the positive electrode base material in the white region and the active layer.

4. The positive electrode tab of claim 3 wherein the adhesive capacity of the first gummed paper is greater than the adhesive capacity of the second gummed paper.

5. The positive electrode sheet of claim 1, wherein the first gummed paper is a textured adhesive.

6. The positive electrode tab of claim 5 wherein the second gummed paper is a transparent gummed paper.

7. The positive electrode sheet of claim 6, wherein the positive electrode substrate is a foamed nickel article.

8. The positive electrode sheet of claim 7, wherein an edge of the second gummed paper adjacent to the blank space is located within the gummed layer area such that the edges of the second gummed paper and the active layer adjacent to each other are spaced apart from each other.

9. A pole piece, characterized by comprising a negative pole piece, a diaphragm and the positive pole piece according to any one of claims 1-8, wherein the diaphragm is arranged between the positive pole piece and the negative pole piece.

10. A battery comprising a battery housing and the pole core of claim 9, wherein the pole core is disposed in the battery housing, and the positive electrode substrate in the glue layer area is close to the bottom wall of the battery housing.