CN216413113U

CN216413113U - Battery negative plate

Info

Publication number: CN216413113U
Application number: CN202021940382.3U
Authority: CN
Inventors: 屈仁杰; 翁勇新
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2022-04-29
Anticipated expiration: 2030-09-08

Abstract

The utility model relates to the technical field of batteries, in particular to a battery negative plate; the technical scheme is as follows: the current collector is covered with a first active layer, and the first active layer is covered with a second active layer; the first active layer and the second active layer are both made of graphite, and the particle stacking gap of the second active layer is larger than that of the first active layer. The current collector of the battery cathode is sequentially covered with a first active layer and a second active layer, and the particle stacking gap of the second active layer is larger than that of the first active layer; the first active layer can bear higher compaction and provide higher energy density, the second active layer is large in surface and more in particle stacking gaps, electrolyte infiltration is facilitated, more active point positions are provided, lithium ions are rapidly accepted, and the negative plate has rapid charging capacity, so that the battery can have the rapid charging capacity and the higher energy density.

Description

Battery negative plate

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery negative plate.

Background

Along with the popularization of new energy automobiles, the demand of the power battery market is gradually expanded, the demand of people on the power battery is higher and higher, and particularly the demand on long endurance and quick charging is more and more urgent. However, the existing EV lithium ion battery is difficult to consider energy density while ensuring the quick charge capability. Therefore, how to compromise the charging speed and energy density of the battery is a general problem in the art.

SUMMERY OF THE UTILITY MODEL

Aiming at the problem that the existing EV lithium ion battery is difficult to give consideration to both energy density and charging speed, the utility model provides a battery negative plate, which gives consideration to both the charging speed and the energy density of the battery through two active coatings with the outer layer particle stacking gap larger than the inner layer particle stacking gap.

The utility model is realized by the following technical scheme:

a battery negative plate comprises a current collector, wherein the current collector is covered with a first active layer, and a second active layer is covered on the first active layer; the first active layer and the second active layer are both made of graphite, and the particle stacking gap of the second active layer is larger than that of the first active layer.

According to the utility model, a current collector of a battery cathode is sequentially covered with a first active layer and a second active layer, and the particle stack gap of the second active layer is larger than that of the first active layer. Therefore, the first active layer can bear higher compaction relative to the second active layer, and the graphite has high capacity, thereby providing higher energy density. The second active layer is lower in density relative to the first active layer, but is larger than the first active layer in surface, and has more particle stacking gaps, so that the second active layer is more favorable for electrolyte infiltration, and can provide more active sites, thereby rapidly receiving lithium ions and having quick charging capacity. Therefore, the negative plate of the utility model can enable the battery to have high energy density while having quick charge capacity.

Preferably, the first active layer is a graphite sheet layer, and since graphite sheets have anisotropy, the first active energy can be ensured to withstand high compaction, and a sufficient energy density of the battery can be ensured.

In a specific embodiment of the first active layer, the aspect ratio of the graphite of the first active layer is 2 to 10.

Preferably, the second active layer is a spherical graphite layer, and although the spherical graphite layer is compacted at the bottom, the spherical graphite layer has a large specific surface and a plurality of particle stacking gaps, so that the impregnation of electrolyte is facilitated, and a plurality of active sites can be provided, so that lithium ions can be rapidly received, and the rapid charging capability of the battery is ensured.

In a specific embodiment of the second active layer, the aspect ratio of the active material of the second active layer is 1 to 1.8.

As a specific embodiment of the current collector, the material of the current collector is copper or copper alloy.

In order to ensure that the battery has enough energy density and charging speed, each surface of the current collector is sequentially covered with a first active layer and a second active layer.

The utility model has the beneficial effects that:

the current collector of the battery cathode is sequentially covered with a first active layer and a second active layer, and the particle stacking gap of the second active layer is larger than that of the first active layer; compared with a negative pole piece made of a single material, the first active layer can bear higher compaction, has high graphite capacity and can provide higher energy density; the surface of the second active layer is large, the gaps among the particle stacks are large, the electrolyte infiltration is facilitated, and meanwhile, more active sites can be provided to quickly receive lithium ions, so that the lithium ion battery has quick charging capacity. Therefore, the utility model can ensure that the battery has high energy density while having quick charging capacity.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

fig. 1 is a schematic structural view of the present invention in use.

Reference numbers and corresponding part names in the drawings:

1-current collector, 2-first active layer, 3-second active layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Examples

A battery negative plate comprises a current collector 1, wherein the current collector 1 is covered with a first active layer 2, and a second active layer 3 is covered on the first active layer 2; the first active layer 2 and the second active layer 3 are both made of graphite, and the particle stacking gap of the second active layer 3 is larger than that of the first active layer 2.

Specifically, the first active layer 2 is a scaly graphite layer, and the scaly graphite has anisotropy, so that the first active energy can be ensured to withstand a high compaction, and a sufficient energy density of the battery can be ensured. In the present embodiment, the aspect ratio of the graphite of the first active layer 2 is 2 to 10, preferably 4 to 8.

As a specific embodiment of the second active layer 3, the second active layer 3 is a spherical graphite layer, and although the spherical graphite layer is compacted and overlapped, the spherical graphite layer has a large specific surface and a large number of gaps in particle stacking, so that the impregnation of the electrolyte is facilitated, and simultaneously, a large number of active sites can be provided, so that lithium ions can be rapidly received, and the rapid charging capability of the battery is ensured. In the present embodiment, the aspect ratio of the active material in the second active layer 3 is 1 to 1.8, preferably 1.2 to 1.6.

In order to ensure that the battery has enough energy density and charging speed, the surfaces of the current collector 1 are sequentially covered with a first active layer 2 and a second active layer 3.

It can be understood that the material of the current collector 1 is copper or copper alloy.

In the present example, a current collector 1 of a battery negative electrode was coated with a first active layer 1 of flake graphite and a second active layer 2 of spherical graphite in this order. It should be understood that flake graphite can withstand higher compaction and that high graphite capacities can provide higher energy densities; although the spherical graphite is low in compaction, the specific surface of the spherical graphite is large, and the stacking gaps of particles are large, so that the spherical graphite is beneficial to the infiltration of electrolyte, can provide more active sites, can quickly receive lithium ions, and has quick charging capacity. Therefore, the battery has the quick charging capacity and high energy density.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The battery negative plate comprises a current collector (1), and is characterized in that the current collector (1) is covered with a first active layer (2), and the first active layer (2) is covered with a second active layer (3);

the first active layer (2) and the second active layer (3) are both made of graphite, and the particle stacking gap of the second active layer (3) is larger than that of the first active layer (2);

the first active layer (2) is a flake graphite layer; the second active layer (3) is a spherical graphite layer.

2. The negative electrode sheet for the battery according to claim 1, wherein the aspect ratio of the graphite of the first active layer (2) is 2-10.

3. The negative electrode sheet for the battery according to claim 1, wherein the aspect ratio of the graphite of the second active layer (3) is 1-1.8.

4. The negative plate for the battery according to any one of claims 1 to 3, wherein the material of the conductive plate of the current collector (1) is copper or copper alloy.

5. The negative plate for the battery according to claim 4, wherein each surface of the current collector (1) is sequentially covered with the first active layer (2) and the second active layer (3).