CN219144370U

CN219144370U - Cylindrical sodium ion battery module

Info

Publication number: CN219144370U
Application number: CN202222553397.XU
Authority: CN
Inventors: 王真; 唐怀远
Original assignee: Liaoning Dengsai New Energy Co ltd
Current assignee: Liaoning Dengsai New Energy Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-06-06
Anticipated expiration: 2032-09-27

Abstract

The cylindrical sodium ion battery module comprises a shell, an upper cover and a plurality of cylindrical sodium ion battery cores arranged in the shell, wherein battery core anodes and battery core cathodes of the plurality of cylindrical sodium ion battery cores are mutually communicated through a connecting bridge to form a sodium ion battery core group, the surface of the upper cover is provided with an anode terminal and a cathode terminal, and the anode terminal and the cathode terminal are positioned on the surface of the upper cover; the sodium ion battery cell group is electrically connected with the positive terminal and the negative terminal, and an electrode mark is arranged on the upper cover of the battery module; the upper cover is encapsulated on the upper opening of the shell. The utility model adopts the design of the double-end tab, greatly reduces the internal resistance of the battery, can be designed into a high-capacity cylindrical battery, adopts a cylindrical battery structure, can relieve the internal stress deformation of the battery core, greatly prolongs the service life of the battery, can meet the requirement of filling 80 percent of capacity in 10 minutes, and is very beneficial to popularization of short-range new energy automobiles.

Description

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

At present, lead-acid batteries or lithium ion batteries are commonly adopted as electric energy sources for low-speed electric vehicles, electric buses and electric trucks, and the defects of large weight and volume of the lead-acid batteries and insufficient trip mileage in winter bring a plurality of inconveniences to users; the lithium ion battery has the defects of high cost, poor safety, poor low temperature property and the like, so that the application and popularization of the lithium ion battery are limited.

Under the background, sodium ion batteries are being developed in great numbers as energy storage batteries and power batteries. The sodium ion battery is developed and technology accumulated for many years, the low-temperature performance, the high-rate charge and discharge performance, the cycle performance and the like of the product are tested and verified in a large quantity at present in the industrialized and large-scale application stage, and the sodium ion battery has market competitiveness against the counter balance of a lead-acid battery and a lithium ion battery.

Known sodium ion batteries fall into three structures, namely: cylindrical sodium ion battery, soft package sodium ion battery, square aluminum hull sodium ion battery. The soft-package sodium ion battery has low capacity, high expansion rate and short service life, so that the soft-package sodium ion battery cannot be adopted on a large scale; the square aluminum-shell sodium ion battery loses the competitive advantage of high cost performance due to complex manufacturing process and higher cost, so that the sodium ion battery cannot be adopted on a large scale; cylindrical sodium ion batteries on the market often adopt a steel shell structure, the capacity range is 1 Ah-5 Ah, the capacity is too low, and if the sodium ion batteries with the structure are used on an energy storage system and a low-speed power automobile, a large number of batteries are required to be connected in series and in parallel, so that the difficulty of the combination process of the battery pack is increased, meanwhile, the cost of a battery pack management system is greatly increased, and the safety of the battery pack is also reduced.

So far, the literature report and the practical application of a large-capacity sodium ion battery module (the capacity is more than or equal to 10 Ah) are not seen.

Disclosure of Invention

The utility model aims to provide a cylindrical sodium ion battery module which has the advantages of low cost, long service life, safety and reliability.

The object of the utility model is achieved in the following way: the cylindrical sodium ion battery module comprises a shell, an upper cover and a plurality of cylindrical sodium ion battery cores arranged in the shell, wherein battery core anodes and battery core cathodes of the plurality of cylindrical sodium ion battery cores are mutually communicated through a connecting bridge to form a sodium ion battery core group, the surface of the upper cover is provided with an anode terminal and a cathode terminal, and the anode terminal and the cathode terminal are positioned on the surface of the upper cover; the sodium ion battery cell group is electrically connected with the positive terminal and the negative terminal, and an electrode mark is arranged on the upper cover of the battery module; the upper cover is encapsulated on the upper opening of the shell.

And a BMS (battery management system) circuit board is arranged in the upper cover, the positive electrode and the negative electrode of the battery core of the cylindrical sodium ion battery core are connected with the BMS circuit board through wires, and a positive electrode connecting piece and a negative electrode connecting piece of the BMS circuit board are correspondingly connected with a positive electrode terminal and a negative electrode terminal on the upper cover.

In order to ensure the structural stability of the module, a gap buffer pad is arranged in the gap between the cylindrical sodium ion battery cells and the shell.

In order to ensure the structural stability of the module, a plurality of upper cover buffer cushions are arranged on the inner side surface of the upper cover.

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

The connecting bridge is nickel plated copper sheet or nickel sheet, and the positive terminal and the negative terminal are nickel plated copper or nickel material.

The beneficial effects of the utility model are as follows:

1. the utility model adopts the design of the double-end tab, so that the internal resistance of the battery is greatly reduced, and the battery can be designed into a large-capacity cylindrical battery, and the battery capacity covers 10 Ah-500 Ah. The structure is characterized in that: the battery adopts a cylindrical cell with battery terminals (positive/negative electrodes) at the same side, and the battery capacity is 10 Ah-500 Ah.

2. The utility model can adopt a cylindrical battery structure, can relieve the internal stress deformation of the battery core, greatly prolongs the service life of the battery, and the laboratory shows that the service life can reach 6000 times or more and can meet the requirements of the energy storage battery.

3. The utility model adopts the winding process, reduces the manufacturing links, saves the manufacturing cost, and has the input-output ratio far higher than that of the common square aluminum shell battery.

4. The utility model has better quick charge and quick discharge performance, can meet the requirement of filling 80% of capacity in 10 minutes, and is very beneficial to popularization of short-range new energy automobiles.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic diagram of a sodium ion cell group.

Fig. 3 is a front view of the upper cover.

Fig. 4 is a top view of the upper cover.

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

In the figure: 1-a negative terminal; 2-electrode identification; 3-connecting bridge; 4-upper cover; 5-positive terminal; 6-conducting wires; 7-screws; 8-a threaded hole; 9-a housing; a 10-BMS circuit board; 11-a cell positive electrode; 12-a cell negative electrode; 13-upper cover cushion; 14-gap cushioning; 15-cylindrical sodium ion cell.

Detailed Description

For the purpose of making the technical solutions of the present utility model more clear, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, embodiments of the present utility model. The components of the embodiments generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

The detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model, but is merely representative of selected embodiments of the utility model. Based on the embodiments of the present utility model, all other embodiments that a person skilled in the art could obtain without making any inventive effort fall within the scope of the present utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Referring to fig. 1-5, a cylindrical sodium ion battery module comprises a housing 9, an upper cover 4 and a plurality of cylindrical sodium ion battery cells 15 arranged in the housing 9, wherein the battery cell anodes 11 and the battery cell cathodes 12 of the plurality of cylindrical sodium ion battery cells 15 are connected together in series, in parallel or in series-parallel by welding through a connecting bridge 3, and are mutually communicated to form a sodium ion battery cell group, in the embodiment, the connecting bridge 3 is in a nickel plating copper sheet or nickel sheet in a series mode; the surface of the upper cover 4 is provided with a positive electrode terminal 5 and a negative electrode terminal 1, the positive electrode terminal 5 and the negative electrode terminal 1 are made of nickel-plated copper or nickel, the positive electrode terminal 5 and the negative electrode terminal 1 are positioned on the surface of the upper cover, and the upper cover 4 of the battery module is provided with an electrode mark 2 for representing the positive electrode and the negative electrode; a BMS circuit board 10 is arranged inside the upper cover 4, and 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; the battery cell positive electrode 11 and the battery cell negative electrode 12 of the cylindrical sodium ion battery cell 15 are connected with the BMS circuit board 10 through the lead 6, and a positive electrode connecting piece and a negative electrode connecting piece of the BMS circuit board 10 are correspondingly connected with the positive electrode terminal 5 and the negative electrode terminal 1 on the upper cover 4; a gap buffer pad 14 is arranged in a gap between the cylindrical sodium ion battery cells 15 and the shell 9, and the gap buffer pad 14 can be made of elastic materials such as rubber or sponge or expansion rubber so as to prevent relative displacement between the sodium ion battery cells; a plurality of upper cover buffer pads 13 are arranged on the inner side surface of the upper cover 4, and the upper cover buffer pads 13 can be made of elastic materials such as rubber or sponge so as to prevent the sodium ion battery cell from up-down displacement; the upper cover 4 is encapsulated on the upper opening of the shell 9, and the upper cover 4 is connected and fixed on the shell 9 through the screw 7 and the threaded hole 8 of the shell 9.

The sodium ion battery cell group outputs a charge-discharge interface through a protection circuit of the BMS circuit board 10, and the protection circuit protects the sodium ion battery cell group after series connection or parallel connection from overcurrent, overtemperature, overcharge and the like; the BMS circuit board 10 is used for monitoring the residual electric quantity of the sodium ion battery cell, ensuring that the residual electric quantity is maintained in a reasonable range through intelligent management, preventing the damage to the sodium ion battery cell group caused by overcharge or overdischarge, and prolonging the service life of the battery cell; the BMS circuit board 10 is provided with a temperature sensor, a voltage/current sampling circuit, an equalizing circuit, a micro control unit circuit, a charging fet circuit, a DC/DC (direct current to direct current) circuit, a communication circuit, and a rectifying/feedback unit.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

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.