CN223712880U - A low-cost cylindrical sodium-ion battery - Google Patents

Abstract

The utility model discloses a low-cost cylindrical sodium ion battery, wherein a bare cell is packaged in a cylindrical shell, the cylindrical shell is a cylindrical aluminum shell, and the opening of the cylindrical aluminum shell is packaged and closed by adopting an aluminum cap. The low-cost cylindrical sodium ion battery has the characteristics of low cost, flexible battery capacity design and convenient processing.

Description

Low-cost cylindrical sodium ion battery

Technical Field

The utility model relates to the technical field of sodium ion batteries, in particular to a low-cost cylindrical sodium ion battery.

Background

The principle of operation of a sodium ion battery is similar to that of a lithium ion battery. They all rely on the movement of ions in the electrolyte to store and release electrical energy. Sodium ions move from the positive electrode (typically sodium compounds) to the negative electrode (typically carbon materials) during charging, and sodium ions return from the negative electrode to the positive electrode during discharging.

Cylindrical sodium ion batteries are generally cylindrical in shape, similar to the common 18650 lithium ion batteries. This design provides certain advantages in terms of volume and weight to the battery for use in a variety of devices. The cylindrical design can also improve the thermal management performance of the battery, reducing the risk of overheating.

With the increase of the requirements for renewable energy sources and energy storage technologies, the sodium ion battery has wide application prospects in the fields of power grid energy storage, electric automobiles, portable electronic equipment and the like.

Currently, cylindrical sodium ion batteries are generally produced by using a steel shell as a packaging shell and adopting a steel shell of rolling groove and mechanical sealing. To prevent rust, the steel shell and the cap need to be electroplated, and the larger the battery shell is, the lower the electroplating yield is, and the higher the comprehensive cost is.

Disclosure of utility model

The utility model aims to provide a cylindrical sodium ion battery with low cost, which has the characteristics of low cost, flexible battery capacity design and convenient processing.

The utility model can be realized by the following technical scheme:

The utility model discloses a low-cost cylindrical sodium ion battery, which comprises a bare cell, wherein the bare cell is packaged in a cylindrical shell, the cylindrical shell is a cylindrical aluminum shell, and the opening of the cylindrical aluminum shell is packaged and closed by adopting an aluminum cap.

Further, the aluminum cap comprises an aluminum positive electrode post, a connecting aluminum sheet and an aluminum current connecting plate which are mutually combined and formed, wherein the aluminum positive electrode post is arranged at the top of the aluminum cap in a protruding mode and is combined and formed through the connecting aluminum sheet and the aluminum current connecting plate at the bottom. By adopting the structure of all aluminum, electroplating is not needed, and the cost is saved.

Further, the connection aluminum sheet is disc-shaped, the area of the connection aluminum sheet is larger than that of the aluminum current connection plate and the aluminum positive electrode post, the outer edge of the connection aluminum sheet is sleeved with an insulating rubber ring, and the connection aluminum sheet is better insulated from the cylindrical aluminum shell and keeps air tightness.

Further, the insulating rubber ring is sleeved on the edge of the connecting aluminum sheet in an L shape and is closed at the opening of the cylindrical aluminum steel shell by the buckling edge, so that the insulating rubber ring is universal to the conventional rolling groove buckling edge equipment and has a simple process.

Further, the bare cell is a coiled cell, a positive plate of the coiled cell is electrically connected with the aluminum current connecting plate, and a negative plate of the coiled cell is electrically connected with the bottom of the cylindrical aluminum shell, so that the processing difficulty is reduced in accordance with the process in the prior art.

Further, the positive pole post, the connecting aluminum sheet and the aluminum current connecting plate are formed by bonding or welding combination through conductive adhesive, so that the combination capacity and the safety of the positive pole post and the aluminum current connecting plate are ensured.

Further, the bare cell comprises a negative plate and a positive plate, the negative plate and the positive plate are mutually isolated through a diaphragm, the size of the negative plate is larger than that of the positive plate, and safety is improved.

Further, the positive plate is a polyanion positive plate, a layered oxide positive plate or a Prussian blue material positive plate, so that the requirements of different types of batteries are met.

Further, the negative electrode plate is a soft carbon negative electrode plate or a hard carbon negative electrode plate.

Further, the aluminum cap is sealed at the opening of the cylindrical aluminum shell in a rolling groove edge buckling mode.

The low-cost cylindrical sodium ion battery has the following beneficial effects:

Firstly, the cost is low, the cylindrical aluminum shell and the aluminum cap do not need electroplating treatment, and the storage after the battery processing is finished does not need special environment, so that the manufacturing cost is effectively reduced;

Secondly, the battery capacity is flexibly designed, and the cylindrical steel shell is replaced by the cylindrical aluminum shell, so that the problem of plating layer bald screw in the channeling process caused by overlarge volume of the steel shell is avoided, and the design requirements of batteries with different capacities are met;

Thirdly, the process is simple, and the production requirement can be met by adopting a process route of 'rolling groove and mechanical sealing' through adopting a mode of matching the cylindrical aluminum shell and the aluminum cap, so that the equipment investment is less, the maintenance cost is low, the reliability is high, the parts of the shell and the cap are fewer, and the process realizability is strong.

Drawings

FIG. 1 is a front view of a cylindrical aluminum housing of a low cost cylindrical sodium ion battery of the present utility model;

FIG. 2 is a top view of a cylindrical aluminum housing of a low cost cylindrical sodium ion battery of the present utility model;

FIG. 3 is a cross-sectional view of a low cost cylindrical sodium ion battery aluminum cap of the present utility model;

FIG. 4 is a top view of a low cost cylindrical sodium ion battery aluminum cap of the present utility model;

The marks in the drawing comprise 100 parts of cylindrical aluminum shell, 200 parts of aluminum cap, 210 parts of aluminum positive pole post, 220 parts of connecting aluminum sheet, 230 parts of aluminum current connecting plate, 240 parts of insulating rubber ring.

Detailed Description

In order to better understand the technical solution of the present utility model, the following describes the product of the present utility model in further detail with reference to examples.

As shown in fig. 1 to 4, the utility model discloses a low-cost cylindrical sodium ion battery, which comprises a bare cell, wherein the bare cell is packaged in a cylindrical shell, the cylindrical shell is a cylindrical aluminum shell 100, and the opening of the cylindrical aluminum shell 100 is packaged and closed by adopting an aluminum cap 200. In the cap structure, the aluminum cap 200 includes an aluminum positive electrode post 210, a connection aluminum sheet 220 and an aluminum current connection plate 230 formed in combination with each other, and the aluminum positive electrode post 210 is convexly disposed at the top of the aluminum cap 299 and formed in combination with the aluminum current connection plate 230 at the bottom through the connection aluminum sheet 220. Meanwhile, the connection aluminum sheet 220 is disc-shaped and the area of the connection aluminum sheet 220 is larger than that of the aluminum current connection plate 230 and the aluminum positive electrode post 210, and the outer edge of the connection aluminum sheet 220 is sleeved with the insulating rubber ring 240.

In a specific sealing process, the insulating rubber ring is sleeved on the edge of the connecting aluminum sheet in an L-shaped manner and is closed at the opening of the cylindrical aluminum steel shell by a buckling edge.

On a specific winding core structure, the bare cell is a winding-shaped cell, a positive plate of the winding-shaped cell is electrically connected with an aluminum current connecting plate, and a negative plate of the winding-shaped cell is electrically connected with the bottom of the cylindrical aluminum shell.

In the forming mode of the aluminum cap, the positive pole post, the connecting aluminum sheet and the aluminum current connecting plate are formed by bonding or welding combination through conductive adhesive.

In the electric conduction mode, the bare cell comprises a negative plate and a positive plate, the negative plate and the positive plate are mutually isolated through a diaphragm, and the size of the negative plate is larger than that of the positive plate.

The utility model can meet the requirements of different types of sodium ion batteries, wherein the solar positive plate is a polyanion positive plate, a layered oxide positive plate or a Prussian blue material positive plate, and the negative plate is a soft carbon negative plate or a hard carbon negative plate.

In the description of the present utility model, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The foregoing examples are merely exemplary embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and that these obvious alternatives fall within the scope of the utility model.

Claims (4)

1. A low-cost cylindrical sodium-ion battery, comprising a bare cell encapsulated in a cylindrical shell, characterized in that: the cylindrical shell is a cylindrical aluminum shell, and the opening of the cylindrical aluminum shell is sealed and closed with an aluminum cap; The aluminum cap includes an aluminum positive electrode post, a connecting aluminum sheet, and an aluminum current connection plate that are assembled together. The aluminum positive electrode post protrudes from the top of the aluminum cap and is assembled with the aluminum current connection plate at the bottom through the connecting aluminum sheet. The connecting aluminum sheet is disc-shaped and its area is larger than that of the aluminum current connection plate and the aluminum positive electrode post. An insulating rubber ring is fitted around the outer edge of the connecting aluminum sheet. The insulating rubber ring is L-shaped and fitted around the edge of the connecting aluminum sheet and is closed by the edge of the cylindrical aluminum steel shell. The bare battery cell is a wound battery cell, the positive electrode of which is electrically connected to an aluminum current connection plate, and the negative electrode of which is electrically connected to the bottom of a cylindrical aluminum shell. The aluminum positive electrode post, connecting aluminum sheet and aluminum current connection plate are assembled by bonding or welding with conductive adhesive. The bare cell includes a negative electrode and a positive electrode, which are separated from each other by a separator. The size of the negative electrode is larger than that of the positive electrode. 2. The low-cost cylindrical sodium-ion battery according to claim 1, characterized in that: the positive electrode is a polyanionic positive electrode, a layered oxide positive electrode, or a Prussian blue material positive electrode. 3. The low-cost cylindrical sodium-ion battery according to claim 2, characterized in that: the negative electrode is a soft carbon negative electrode or a hard carbon negative electrode. 4. The low-cost cylindrical sodium-ion battery according to claim 3, characterized in that: the aluminum cap is sealed at the opening of the cylindrical aluminum shell by a grooved edge fastening method.