Small sodium ion battery module suitable for standby power supply

Abstract

The utility model relates to a small-sized sodium ion battery module suitable for a standby power supply, which comprises a lower shell, a plurality of first partition plates and a plurality of second partition plates are arranged in the lower shell, the first partition plates and the second partition plates are transversely and longitudinally arranged in a crossed manner, and a cavity enclosed by the first partition plates and the second partition plates is used for placing battery cells; the first support frame, the second support frame and the third support frame are used for supporting the lower shell; and the upper cover covers the upper opening of the lower shell, and the upper cover and the lower shell form a sealed cavity structure. The utility model discloses a small-sized sodium ion battery module applicable to a standby power supply, which relates to the technical field of sodium ion batteries and does not need to reserve extra expansion space because the expansion force of the battery is small. Meanwhile, a foam partition plate with a specific thickness is not needed, the requirement can be met only by a partition plate with the thickness of 0.5 mm, and in view of the fact that the battery does not have the risk of thermal runaway, the partition plate does not need to have the characteristics of fireproof and heat-insulating materials.

Description

Technical Field

[0001] This utility model relates to the field of sodium-ion battery technology, and in particular to a small sodium-ion battery module suitable for backup power. Background Technology

[0002] Sodium-ion batteries, with their abundant resources, low cost, and environmentally friendly characteristics, are gradually becoming an important supplement to lithium-ion batteries in the energy storage field. Especially in backup power scenarios (such as communication base stations, data center UPS, emergency lighting, etc.), sodium-ion batteries have shown application potential due to their adaptability to high and low temperatures and low self-discharge rate.

[0003] Application No. 2023108129024 discloses a sodium-ion battery with thermal stability of positive and negative electrode active materials greater than 900℃. Furthermore, there are no CEI and SEI side reactions between the electrolyte and the positive and negative electrode active materials, eliminating the possibility of thermal runaway. In float charge mode, the current is close to zero, making it ideal as a backup power source. The battery active materials used exhibit minimal volume change during charge and discharge. The volume change rate of the negative electrode material is <4%, far lower than that of lithium-ion battery negative electrodes (>10%); the volume change rate of the positive electrode material is <7%. This low volume effect battery system differs from current commercial sodium-ion batteries in its module design. However, current commercial sodium-ion battery modules still use the stacked architecture of traditional lithium-ion battery modules, resulting in low volumetric energy density and significant thermal coupling effects between cells within the module. This leads to performance degradation under long-term cycling, limiting its application in miniaturized, high-reliability backup power scenarios. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the existing sodium-ion battery module uses the stacked architecture of the traditional lithium battery module, which is not suitable for the structure of sodium-ion battery modules.

[0005] To solve the above-mentioned technical problems, this utility model provides a small sodium-ion battery module suitable for backup power, comprising: a lower housing, which is a rectangular box-shaped structure with an open top, wherein the lower housing is provided with a plurality of first partition plates and a plurality of second partition plates arranged in a cross pattern, and the cavity enclosed by the first partition plates and the second partition plates is used to place the battery cells; a first support frame, which is disposed on the rectangular inner wall of one side of the lower housing; a second support frame, which is disposed on the rectangular inner wall of one side of the lower housing, and the second support frame is directly opposite to the first support frame; a third support frame, which is installed inside the lower housing, and the third support frame is arranged parallel to the first support frame and the second support frame, and the third support frame is located between the first support frame and the second support frame; and an upper cover, which covers the upper opening of the lower housing, and the upper cover and the lower housing form a sealed cavity structure.

[0006] In one embodiment of the present invention, the first partition plate is a rectangular flat plate, the first partition plate passes through the third support frame, and the two ends of the first partition plate are respectively connected to the first support frame and the second support frame.

[0007] In one embodiment of the present invention, the second partition plate has a rectangular cross-section, and the upper end of the second partition plate is provided with a trapezoidal groove.

[0008] In one embodiment of the present invention, the first support frame includes a first support plate and a plurality of first stiffeners. The first support plate is disposed opposite to the side wall of the lower housing, and the plurality of first stiffeners are disposed parallel to each other between the first support plate and the side wall of the lower housing.

[0009] In one embodiment of the present invention, the second support frame includes a U-shaped plate and two right-angle plates, the two right-angle plates being respectively disposed at two corner positions of the lower housing, and the two ends of the U-shaped plate being connected to the inner wall of the lower housing.

[0010] In one embodiment of this utility model, a second rib is provided between the U-shaped plate and the two right-angled plates and the inner wall of the lower shell.

[0011] In one embodiment of the present invention, the third support frame includes two opposing third support plates and a plurality of third stiffeners. The lower end of the third support plate is connected to the bottom surface of the lower housing, and the side of the third support plate is connected to the inner wall of the lower housing. The plurality of third stiffeners are arranged in parallel between the two opposing third support plates.

[0012] In one embodiment of this utility model, the upper cover is a rectangular plate, and a plurality of rectangular protrusions are provided on the inner wall of the upper cover opposite to the lower shell. The plurality of rectangular protrusions are arranged in parallel, and the rectangular protrusions are used to adhere insulating foam.

[0013] In one embodiment of the present invention, at least one wiring terminal is provided on the side wall of the lower housing.

[0014] In one embodiment of the present invention, a wire groove is provided on the outer side wall of the lower housing, the wire groove and the terminal are located on the same side wall of the lower housing, and a terminal cover plate is connected to the outer wall of the lower housing where the wire groove and the terminal are provided, the terminal cover plate covering the position of the wire groove and the terminal.

[0015] Compared with the prior art, the small sodium-ion battery module of this utility model suitable for backup power supply has the following advantages:

[0016] 1) Because the battery itself has little expansion force, the battery itself does not require a fastening force.

[0017] 2) The battery itself has low expansion force, so there is no need to reserve extra expansion space. At the same time, there is no need for a specific thick foam separator; a separator with a thickness of only 0.5mm is sufficient. Given that this battery has no risk of thermal runaway, the separator does not need to have fireproof and heat-insulating material properties. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of a small sodium-ion battery module suitable for use as a backup power supply in a preferred embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a small sodium-ion battery module suitable for backup power in a preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the lower shell structure in a preferred embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of the lower shell in a preferred embodiment of the present invention;

[0023] Figure 5 This is a dimensional diagram of the second partition plate in a preferred embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the upper cover in a preferred embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the external structure of the lower shell in a preferred embodiment of the present invention.

[0026] Explanation of reference numerals in the accompanying drawings: Lower housing 1, First partition plate 11, Second partition plate 12, Trapezoidal groove 121, Terminal block 13, Wire groove 14, First support frame 2, First support plate 21, First stiffener 22, Second support frame 3, U-shaped plate 31, Right angle plate 32, Second stiffener 33, Third support frame 4, Third support plate 41, Groove 411, Third stiffener 42, Top cover 5, Rectangular protrusion 51, Terminal cover plate 6, Battery cell 100. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1 , 2As shown, the small sodium-ion battery module of this utility model, suitable for backup power, includes several main parts: a lower housing 1, a first support frame 2, a second support frame 3, a third support frame 4, and an upper cover 5; the lower housing 1 is a rectangular box-shaped structure with an opening at the top, and the lower housing 1 is provided with a plurality of first partition plates 11 and a plurality of second partition plates 12 arranged horizontally and vertically, and the cavity enclosed by the first partition plates 11 and the second partition plates 12 is used to place the battery cell 100; the first support frame 2 is disposed on the rectangular inner wall of one side of the lower housing 1; the second support frame 3 is disposed on the rectangular inner wall of one side of the lower housing 1, and the second support frame 3 is directly opposite to the first support frame 2; the third support frame 4 is installed inside the lower housing 1, and the third support frame 4 is arranged parallel to the first support frame 2 and the second support frame 3, and the third support frame 4 is located between the first support frame 2 and the second support frame 3; the upper cover 5 covers the upper opening of the lower housing 1, and the upper cover 5 and the lower housing 1 form a sealed cavity structure.

[0029] In the above structure, the first partition plate 11 is a rectangular flat plate that penetrates the third support frame 4, and its two ends are connected to the first support frame 2 and the second support frame 3, respectively. The first partition plate 11 is perpendicular to the first support frame 2, the second support frame 3, and the third support frame 4. The first partition plate 11 is located in the middle of the first support frame 2, the second support frame 3, and the third support frame 4. Preferably, the first partition plate 11 is a single piece, and the third support frame 4 is a single piece. The first partition plate 11 and the third support frame 4 intersect in a cross shape to first divide the lower housing 1 into four rectangular cavities, and then a second partition plate 12 is installed in the rectangular housing to form an independent cell placement cavity.

[0030] Reference Figure 4 , 5 As shown, the second partition plate 12 has a rectangular cross-section, and a trapezoidal groove 121 is provided at the upper end of the second partition plate 12. The trapezoidal groove 121 has an isosceles trapezoidal cross-section, with its upper base close to the bottom surface of the lower housing 1, and its lower base located on the upper edge of the second partition plate 12. The trapezoidal groove 121 provides space for the expansion of the battery cell. The bottom height H1 of the second partition plate 12 is 10-20mm, and the width W on both sides is 10-30mm. The overall height H2 of the second partition plate 12 is 120mm, equal to the height of the battery cell; the difference between the overall height H2 of the second partition plate 12 and the height H0 of the lower housing is 10-25mm, providing space for the electrical connection of the battery cell 100.

[0031] Reference Figure 3As shown, the first support frame 2 includes a first support plate 21 and a plurality of first stiffening plates 22. The first support plate 21 is disposed opposite to the side wall of the lower housing 1, and the plurality of first stiffening plates 22 are disposed parallel to each other between the first support plate 21 and the side wall of the lower housing 1. The first support plate 21 is a rectangular plate, and the plurality of first stiffening plates 22 are disposed at even intervals.

[0032] Reference Figure 3 As shown, the second support frame 3 includes a U-shaped plate 31 and two right-angle plates 32. The two right-angle plates 32 are respectively located at the two corners of the lower housing 1. The two ends of the U-shaped plate 31 are connected to the inner wall of the lower housing 1. The U-shaped plate 31 is located between the two right-angle plates 32. A second stiffening plate 33 is provided between the U-shaped plate 31 and the two right-angle plates 32 and the inner wall of the lower housing 1.

[0033] Reference Figure 3 As shown, the third support frame 4 includes two opposing third support plates 41 and several third stiffeners 42. The lower end of the third support plate 41 is connected to the bottom surface of the lower housing 1, and the side of the third support plate 41 is connected to the inner wall of the lower housing 1. The several third stiffeners 42 are arranged parallel between the two opposing third support plates 41. A groove 411 is provided on the upper end of the third support plate 41, and the groove 411 is used for connecting the current collector between the battery cells.

[0034] Reference Figure 6 As shown, the upper cover 5 is a rectangular plate. Several rectangular protrusions 51 are provided on the inner wall of the upper cover 5 opposite to the lower housing 1. These rectangular protrusions 51 are arranged in parallel and are used to adhere insulating foam. The rectangular protrusions 51 protrude towards the inside of the lower housing 1 and, after adhering the insulating foam ring, are used to fix the battery cell 100 inside the lower housing 1.

[0035] Reference Figure 7 As shown, at least one wiring terminal 13 is provided on the side wall of the lower housing 1. A wire groove 14 is provided on the outer side wall of the lower housing 1. The wire groove 14 and the wiring terminal 13 are located on the same side wall of the lower housing 1. A terminal cover plate 6 is connected to the outer wall of the lower housing 1 where the wire groove 14 and the wiring terminal 13 are located, covering the positions of the wire groove 14 and the wiring terminal 13. After the wiring terminal 13 is connected, the terminal cover plate 6 is fastened to the outer wall of the lower housing 1, which can hide the connected wires and ensure the battery module has a neat and aesthetically pleasing appearance.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A small-sized sodium-ion battery module suitable for backup power supply, characterized by, The utility model relates to a battery pack, including: a lower shell which is a rectangular box structure with an open upper end, the lower shell is internally provided with a plurality of first partition plates and a plurality of second partition plates arranged transversely and longitudinally, the first partition plates and the second partition plates enclose cavities for placing battery cells; a first support frame arranged on the rectangular inner wall of one side of the lower shell; a second support frame arranged on the rectangular inner wall of one side of the lower shell, and the second support frame is arranged opposite to the first support frame; a third support frame mounted inside the lower shell, the third support frame is arranged parallel to the first support frame and the second support frame, and the third support frame is located between the first support frame and the second support frame; an upper cover covering the open upper end of the lower shell, and the upper cover and the lower shell form a sealed cavity structure.

2. The small-sized sodium-ion battery module suitable for backup power supply according to claim 1, characterized in that: The first partition plate is a rectangular flat plate, the first partition plate penetrates the third support frame, and the two ends of the first partition plate are connected with the first support frame and the second support frame respectively.

3. The small-sized sodium-ion battery module suitable for backup power supply according to claim 1, characterized in that: The second partition plate has a rectangular cross section, and the upper end of the second partition plate is provided with a trapezoidal groove.

4. The small form factor sodium-ion battery module for backup power supply of claim 1, wherein: The first support frame includes a first support plate and a plurality of first rib plates, the first support plate is arranged opposite to the side wall of the lower shell, and the plurality of first rib plates are arranged parallel to each other between the first support plate and the side wall of the lower shell.

5. The small form factor sodium-ion battery module for backup power supply of claim 1, wherein: The second support frame includes a U-shaped plate and two right-angle plates, the two right-angle plates are arranged at two corner positions of the lower shell respectively, and the two ends of the U-shaped plate are connected with the inner wall of the lower shell.

6. The small-sized sodium-ion battery module for backup power supply according to claim 5, characterized in that: Second rib plates are arranged between the U-shaped plate, the two right-angle plates and the inner wall of the lower shell.

7. The small form factor sodium-ion battery module for backup power supply of claim 1, wherein: The third support frame includes two oppositely arranged third support plates and a plurality of third rib plates, the lower end of the third support plate is connected with the bottom surface of the lower shell, the side surface of the third support plate is connected with the inner side wall of the lower shell, and the plurality of third rib plates are arranged parallel between the two oppositely arranged third support plates.

8. The small form factor sodium-ion battery module for backup power supply of claim 1, wherein: The upper cover is a rectangular plate, a plurality of rectangular ribs are arranged on the opposite inner walls of the upper cover and the lower shell, the plurality of rectangular ribs are arranged parallel, and the rectangular ribs are used for sticking insulating foam.

9. The small form factor sodium-ion battery module for backup power supply of claim 1, wherein: At least one wiring terminal is arranged on the side wall of the lower shell.

10. The small-sized sodium-ion battery module for backup power supply according to claim 9, characterized in that: A wire groove is arranged on the outer side wall of the lower shell, the wire groove and the wiring terminal are located on the same side wall of the lower shell, a terminal cover plate is connected with the outer wall of the lower shell provided with the wire groove and the wiring terminal, and the terminal cover plate covers the positions of the wire groove and the wiring terminal.

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