CN219144370U - Cylindrical sodium ion battery module - Google Patents

Abstract

A cylindrical sodium-ion battery module, comprising a casing, an upper cover, and a plurality of cylindrical sodium-ion cells arranged in the casing, the positive electrodes and the negative electrodes of the multiple cylindrical sodium-ion cells are connected to each other through connecting bridges to form For the sodium ion battery pack, the surface of the upper cover is provided with a positive terminal and a negative terminal, and the positive terminal and the negative terminal are located on the surface of the upper cover; the sodium ion battery pack is electrically connected with the positive terminal and the negative terminal, and the battery module cover is provided with Electrode identification; the upper cover is sealed on the upper opening of the shell. The utility model adopts the design of double-headed tabs, which greatly reduces the internal resistance of the battery, so it can be designed as a large-capacity cylindrical battery. The cylindrical battery structure can relieve the internal stress and deformation of the battery, greatly prolong the battery life, and can be fully charged in 10 minutes. The demand for 80% capacity is very beneficial to the promotion of short-range new energy vehicles.

Description

A cylindrical sodium-ion battery module

technical field

The utility model relates to the field of batteries, in particular to a cylindrical sodium ion battery module.

Background technique

Current low-speed electric vehicles, electric buses, and electric trucks generally use lead-acid batteries or lithium-ion batteries as the source of electric energy. Due to the disadvantages of high cost, poor safety, and poor low temperature performance, the application and promotion of lithium-ion batteries are limited.

In this context, people have developed sodium-ion batteries as energy storage batteries and power batteries. After years of research and development and technical accumulation, sodium-ion batteries have entered the stage of industrialization and large-scale application. The low-temperature performance, high-rate charge-discharge performance, and cycle performance of the product have been verified by a large number of tests. They are comparable to lead-acid batteries and lithium batteries. Ion batteries compete against the market competitiveness.

The known sodium-ion batteries are divided into three structures, namely: cylindrical sodium-ion batteries, soft-pack sodium-ion batteries, and square aluminum-shell sodium-ion batteries. Soft-pack sodium-ion batteries have low capacity, high expansion rate, and short life, so they cannot be used on a large scale; square aluminum-shell sodium-ion batteries lose their competitive advantage of cost-effectiveness due to the complicated manufacturing process and high cost, so they cannot Large-scale adoption; cylindrical sodium-ion batteries on the market often adopt a steel shell structure, with a capacity range of 1Ah~5Ah, and the capacity is too low. If the sodium-ion battery with this structure is used in energy storage systems and low-speed power vehicles, a large number of batteries are required to be connected in series , parallel connection, which not only increases the difficulty of the combination process of the battery pack, but also greatly increases the cost of the battery pack management system, and also reduces the safety of the battery pack.

So far, there are no literature reports and practical applications of large-capacity sodium-ion battery modules (capacity ≥ 10Ah).

Contents of the invention

The purpose of the utility model is to provide a cylindrical sodium ion battery module, which has low cost, long service life, safe and reliable performance.

The purpose of this utility model is achieved in the following manner: a cylindrical sodium ion battery module, including a housing, an upper cover, and a plurality of cylindrical sodium ion batteries arranged in the housing, and batteries for a plurality of cylindrical sodium ion batteries The positive electrode of the core and the negative electrode of the battery are connected to each other through the connecting bridge to form a sodium ion battery pack. The surface of the upper cover is provided with a positive terminal and a negative terminal, and the positive terminal and the negative terminal are located on the surface of the upper cover; the sodium ion battery pack is connected to the positive terminal, The negative terminal is electrically connected, and the battery module cover is provided with an electrode mark; the cover is packaged on the upper opening of the casing.

A BMS (battery management system) circuit board is installed inside the upper cover. The positive pole and negative pole of the battery cell of the cylindrical sodium ion battery are connected to the BMS circuit board through wires, and the positive and negative connectors of the BMS circuit board are connected to the upper cover. Connect the positive terminal and negative terminal correspondingly.

In order to ensure the structural stability of the module, a gap cushion is provided in the gap between the cylindrical sodium ion cells, and in the gap between the cylindrical sodium ion cells and the housing.

In order to ensure the structural stability of the module, several upper cover buffer pads are arranged on the inner side of the upper cover.

The BMS circuit board is arranged on the inner side of the upper cover, and is fixed on the upper cover by screws.

The connection bridge is made of nickel-plated copper or nickel, and the positive and negative terminals are made of nickel-plated copper or nickel.

The beneficial effects of the utility model are:

1. The utility model adopts the design of double-headed tabs, which greatly reduces the internal resistance of the battery, so it can be designed as a large-capacity cylindrical battery, and the battery capacity covers 10Ah~500Ah. Its structural features are: the battery adopts a cylindrical battery cell with battery terminals (battery positive/negative pole) on the same side, and the battery capacity is 10Ah~500Ah.

2. The utility model can adopt a cylindrical battery structure, which can alleviate the internal stress deformation of the battery core and greatly prolong the battery life. According to the laboratory, the life can reach more than 6000 times, which can meet the needs of energy storage batteries.

3. The utility model adopts the winding process, which reduces the manufacturing links and saves the manufacturing cost, and the input-output ratio is much higher than that of ordinary square aluminum shell batteries.

4. The utility model has better fast charging and quick discharging performance, which can meet the demand of charging 80% of the capacity in 10 minutes, which is very beneficial for the promotion of short-range new energy vehicles.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of a sodium ion battery pack.

Figure 3 is a front view of the upper cover.

Figure 4 is a top view of the upper cover.

Fig. 5 is an outline view of the utility model.

In the figure: 1-negative terminal; 2-electrode identification; 3-connecting bridge; 4-top cover; 5-positive terminal; 6-wire; 7-screw; 8-threaded hole; 9-housing; 10-BMS circuit Plate; 11-cell positive pole; 12-cell negative pole; 13-cover cushion; 14-gap cushion; 15-cylindrical sodium ion battery.

Detailed ways

In order to make the purpose and technical solution of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the utility model, not all of them. the embodiment. The components of the embodiments generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

The detailed description of the embodiments of the present invention is not intended to limit the scope of claims, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present utility model.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

Referring to Figures 1-5, a cylindrical sodium ion battery module includes a housing 9, an upper cover 4, and a plurality of cylindrical sodium ion batteries 15 arranged in the housing 9, and a plurality of cylindrical sodium ion batteries 15 The battery positive electrode 11 and the battery negative electrode 12 are connected in series, parallel or series-parallel through the connecting bridge 3 and connected together by welding to form a sodium ion battery pack. Nickel copper sheet or nickel sheet; the surface of the upper cover 4 is provided with a positive terminal 5 and a negative terminal 1, the positive terminal 5 and the negative terminal 1 are made of nickel-plated copper or nickel, and the positive terminal 5 and the negative terminal 1 are located on the surface of the upper cover. The upper cover 4 of the battery module is provided with an electrode mark 2 indicating the positive pole and the negative pole; a BMS circuit board 10 is arranged inside the upper cover 4, and the BMS circuit board 10 is arranged on the inner side of the upper cover 4 and fixed to the upper cover 4 by screws. On: the battery positive pole 11 and the battery negative pole 12 of the cylindrical sodium ion battery 15 are connected to the BMS circuit board 10 through the wire 6, and the positive pole connector and the negative pole connector of the BMS circuit board 10 are connected to the positive pole terminal 5 on the upper cover 4, The negative terminal 1 is correspondingly connected; in the gap between the cylindrical sodium ion batteries 15, and in the gap between the cylindrical sodium ion batteries 15 and the housing 9, a gap buffer pad 14 is arranged, and the gap buffer pad 14 can be selected from rubber or Elastic material such as sponge, or play expansion glue, to prevent the relative displacement between sodium ion cell; Set some upper cover buffer pads 13 on the inner side of upper cover 4, upper cover buffer pad 13 can be selected rubber or sponge etc. for use. The elastic material is used to prevent the sodium ion cell from moving up and down; the upper cover 4 is packaged on the upper opening of the housing 9 , and the upper cover 4 is connected and fixed on the housing 9 through the screw 7 and the threaded hole 8 of the housing 9 .

The sodium ion battery core group outputs the charge and discharge interface through the protection circuit of the BMS circuit board 10, and the protection circuit performs overcurrent, overtemperature and overcharge protection on the sodium ion battery core group connected in series or in parallel; the BMS circuit board 10 is used to monitor the sodium ion battery pack. The remaining power of the ion battery, through intelligent management, ensures that the remaining power is maintained within a reasonable range, prevents damage to the sodium ion battery pack due to overcharging or overdischarging, and prolongs the service life of the battery; BMS circuit board 10 It is equipped with temperature sensor, voltage/current sampling circuit, equalization circuit, micro control unit circuit, charging FET circuit, DC/DC (direct current to direct current) circuit, communication circuit and rectification/feedback unit.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (6)

1. The utility model provides a cylinder sodium ion battery module, includes casing (9), upper cover (4) and sets up a plurality of cylinder sodium ion electric core (15) in casing (9), its characterized in that: the battery cell positive electrodes (11) and the battery cell negative electrodes (12) of the cylindrical sodium ion battery cells (15) are mutually communicated through the connecting bridge (3) to form a sodium ion battery cell group, the surface of the upper cover (4) is provided with a positive electrode terminal (5) and a negative electrode terminal (1), the sodium ion battery cell group is electrically connected with the positive electrode terminal (5) and the negative electrode terminal (1), and the upper cover (4) of the battery module is provided with an electrode mark (2); the upper cover (4) is encapsulated on the upper opening of the shell (9).

2. The cylindrical sodium ion battery module according to claim 1, wherein: be provided with BMS circuit board (10) in upper cover (4) inside, battery core positive pole (11) of cylinder sodium ion battery core (15), battery core negative pole (12) are connected with BMS circuit board (10) through wire (6), and positive pole connecting piece, negative pole connecting piece of BMS circuit board (10) are connected with positive terminal (5), negative terminal (1) correspondence on upper cover (4).

3. The cylindrical sodium ion battery module according to claim 1, wherein: a gap buffer pad (14) is arranged in the gap between the cylindrical sodium ion battery cells (15) and the shell (9).

4. The cylindrical sodium ion battery module according to claim 1, wherein: a plurality of upper cover buffer pads (13) are arranged on the inner side surface of the upper cover (4).

5. The cylindrical sodium ion battery module according to claim 2, wherein: the BMS circuit board (10) is arranged on the inner side surface of the upper cover (4) and is fixed on the upper cover (4) through screws.

6. The cylindrical sodium ion battery module according to claim 1, wherein: the connecting bridge (3) is nickel plating copper sheet or nickel sheet, and the positive electrode terminal (5) and the negative electrode terminal (1) are nickel plating copper or nickel material.

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