High-capacity battery jar with thickness gradient

Abstract

The utility model discloses a high-capacity battery jar with thickness gradient, the inner cavity of the high-capacity battery jar is divided into a plurality of unit cells by separating ribs, the separating ribs are divided into a plurality of areas from the bottom to the top, and the thickness of each area is gradually reduced from the bottom to the top. According to the high-capacity battery jar with the thickness gradient, the partition rib is divided into a plurality of areas from the bottom to the top, and the thickness of each area is reduced in a gradient manner from the bottom to the top, so that the pattern draft of each area can be lower, the average side wall thickness of each unit cell in the battery jar is effectively reduced, the volume of each unit cell can be increased, and the size of the battery jar is reduced. And the battery cycle life is prolonged. Meanwhile, the thickness of the partition ribs is reduced, so that materials for manufacturing the battery jar are saved and the weight of the battery jar is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-acid batteries, and in particular relates to a high-capacity battery tank with a thickness gradient. Background Art

[0002] The interior of the lead-acid battery tank is mainly composed of several cells, each of which is filled with a pole group, and then diluted sulfuric acid is added to complete the battery assembly. Due to the overall size of the power battery, the single cell space of the battery tank is limited. When the pole group reaction substances are the same, the increase in acid density will increase the capacity of the positive plate, but the self-discharge of the lead-acid battery will increase, the corrosion of the grid will also accelerate, and the lead dioxide will loosen and fall off. As the density of acid used in the battery increases, the cycle life will decrease.

[0003] Therefore, in order to increase the cycle life of the battery, we can only consider increasing the battery's acid capacity within a limited range, reducing the density of sulfuric acid, and increasing the sulfuric acid capacity.

[0004] Because there are multiple partitions inside the battery slot, the partitions serve to separate each battery cell. In order to increase the acid capacity of each cell in the battery slot, the thickness of the middle partition can be reduced. However, reducing the thickness may cause die pulling and perforation, resulting in product damage or reduced production efficiency.

[0005] For example, a utility model with authorization announcement number CN210092143U discloses a new type of lead-acid battery trough, comprising: a trough, an opening is provided at the upper end of the trough, the inner walls of the left and right ends of the trough are both wedge-shaped inclined surfaces, a plurality of spacers are provided in the trough, the plurality of spacers are vertically arranged in the trough and divide the trough into a plurality of single grids with uniform horizontal width, the plurality of spacers are all wedge-shaped, and a plurality of vertically arranged inverted wedge-shaped strips are provided on the left and right side surfaces of the plurality of spacers and on the inner walls of the left and right ends of the trough.

[0006] In the prior art, the partition ribs used to separate different cells in the battery slot are generally thinner at the top and thicker at the bottom, mainly to facilitate the demolding of the battery slot after injection. The angle formed by the different thicknesses is the demolding angle, or draft angle. However, due to the high total height and wide width of the battery slot, the draft angle of the middle partition rib can only be as low as 0.2° to 0.3° when the battery plastic shell is injected out of the mold. If it is lower than 0.2°, the mold may be pulled and perforated.

[0007] The larger draft angle requires thicker ribs, which reduces the single cell space, lowers the battery acid volume, and reduces the battery cycle life. At the same time, the middle ribs are thicker and are evenly stressed, with basically no external stress, so thicker walls are not required. However, due to the limitations of existing processes, the rib wall thickness cannot be reduced, resulting in unnecessary material waste. Utility Model Content

[0008] The utility model aims at the above-mentioned deficiencies in the prior art and provides a high-capacity battery container with a thickness gradient.

[0009] A high-capacity battery container with a thickness gradient, wherein the inner cavity of the high-capacity battery container is divided into a plurality of single cells by partition ribs, wherein the partition ribs are divided into a plurality of regions from the bottom to the top, and the thickness of each region decreases in a gradient from the bottom to the top.

[0010] Preferably, the inner cavity of the high-capacity battery container is divided into 6 single cells by partition bars, and the single cells are arranged in a row.

[0011] Preferably, the partition ribs are divided into 3 to 8 regions from bottom to top, and the heights of the regions are the same or different.

[0012] More preferably, the height of each area accounts for 10% to 50% of the total height of the ribs.

[0013] Further preferably, the partition ribs are divided into 4 to 6 regions from bottom to top, and the height of each region accounts for 15% to 30% of the total height of the partition ribs.

[0014] Preferably, the partition rib has a draft angle in each region, and the draft angle of the partition rib in each region is less than or equal to 0.2°.

[0015] More preferably, the draft angle of the partition rib in each area is 0.13° to 0.2°.

[0016] Preferably, the thickness of the area located at the bottom of the partition rib is 1.6-1.8 mm; the thickness of the area located at the top of the partition rib is 1-1.1 mm.

[0017] The utility model has a high-capacity battery tank with a thickness gradient. The ribs are divided into multiple areas from the bottom to the top. The thickness of each area decreases gradually from the bottom to the top, so that the draft angle of each area can be lowered. The average side wall thickness of each cell in the battery tank is effectively reduced, so that the volume of the cell can be increased, thereby improving the battery cycle life. At the same time, the reduction in the thickness of the ribs can save materials for manufacturing the battery tank and reduce the weight of the battery tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the half-section structure of a high-capacity battery container with a thickness gradient according to the present invention.

[0019] Figure numerals: single cell 1, partition rib 2. DETAILED DESCRIPTION

[0020] like Figure 1As shown, a high-capacity battery container with a thickness gradient is used to prepare a lead-acid battery. The inner cavity of the high-capacity battery container is divided into a plurality of cells 1 by partition bars 2. The structure shown in the figure is a half-section view, and the other half of the structure is symmetrical with the structure in the figure about the section.

[0021] Figure 1 In the structure shown in , the inner cavity of the high-capacity battery container is divided into 6 cells 1 by the partition ribs 2, and each cell 1 is arranged in a row. The number of cells 1 of the high-capacity battery container of the present application can also be other, such as 3 cells 1. For the high-capacity battery container structure including 6 cells 1, the arrangement of each cell 1 is not limited to Figure 1 The 1×6 arrangement shown in FIG. 1 can also be a 2×3 arrangement.

[0022] Since the battery slot is made of plastic injection molding, each rib 2 has a draft angle, that is, a demoulding angle, so that the battery slot can be demoulded after injection molding. Due to the existence of the demoulding angle, the rib 2 needs to be thicker at the bottom and thinner at the top.

[0023] In the present application, in addition to the draft angle, the partition rib 2 is divided into multiple regions from bottom to top, and the thickness of each region decreases gradually from bottom to top. The boundaries between the regions are generally horizontal lines, and of course the boundaries can also be set to other angles or non-straight lines.

[0024] By designing in different regions, the draft angle of each region can be designed to be smaller, that is, the side wall of each region is closer to vertical, so that the thickness of the partition rib 2 can be reduced.

[0025] Preferably, the partition rib 2 is divided into 3 to 8 regions from the bottom to the top, and the heights of the regions are the same or different. The height of each region accounts for 10% to 50% of the total height of the partition rib.

[0026] A more preferred design is that the partition rib 2 is divided into 4 to 6 regions from the bottom to the top, and the height of each region accounts for 15% to 30% of the total height of the partition rib.

[0027] By arranging the partition ribs 2 in different regions in the present application, the draft angle of the partition ribs 2 in each region can be less than or equal to 0.2°. Preferably, the draft angle of the partition ribs 2 in each region is 0.13° to 0.2°.

[0028] The thickness of the area located at the bottom of the partition rib 2 is 1.6 to 1.8 mm; the thickness of the area located at the top of the partition rib 2 is 1 to 1.1 mm.

[0029] According to calculations, when the partition 2 is divided into 5 areas and the height of each area is 20% of the overall height of the partition 2, the draft angle of each area in the partition 2 can be 0.13°, which greatly reduces the draft angle and effectively reduces the average wall thickness of the single cell 1. According to calculations, taking a conventional 20Ah battery as an example, the volume of a single cell increases by 2.5 to 3.2 ml, the battery cycle life increases by more than 5%, and the weight of a single battery slot decreases by more than 8g.

[0030] The utility model has a high-capacity battery tank with a thickness gradient. The ribs are divided into multiple areas from the bottom to the top. The thickness of each area decreases gradually from the bottom to the top, so that the draft angle of each area can be lowered. The average side wall thickness of each cell in the battery tank is effectively reduced, so that the volume of the cell can be increased, thereby improving the battery cycle life. At the same time, the reduction in the thickness of the ribs can save materials for manufacturing the battery tank and reduce the weight of the battery tank.

Claims

1. A high-capacity battery container with a thickness gradient, wherein the inner cavity of the high-capacity battery container is divided into a plurality of cells by partition bars, characterized in that: The partition ribs are divided into a plurality of regions from the bottom to the top, and the thickness of each region decreases gradually from the bottom to the top.

2. The high-capacity battery container with thickness gradient according to claim 1, characterized in that: The inner cavity of the high-capacity battery container is divided into 6 cells by partition bars, and the cells are arranged in a row.

3. The high-capacity battery container with thickness gradient according to claim 1 or 2, characterized in that: The partition ribs are divided into 3 to 8 regions from the bottom to the top, and the heights of the regions are the same or different.

4. The high-capacity battery container with thickness gradient according to claim 3, characterized in that: The height of each area accounts for 10% to 50% of the total height of the partition bar.

5. The high-capacity battery container with thickness gradient according to claim 4, characterized in that: The partition ribs are divided into 4 to 6 regions from the bottom to the top, and the height of each region accounts for 15% to 30% of the total height of the partition ribs.

6. The high-capacity battery container with thickness gradient according to claim 1 or 2, characterized in that: The partition rib has a draft angle in each region, and the draft angle of the partition rib in each region is less than or equal to 0.2°.

7. The high-capacity battery container with thickness gradient according to claim 6, characterized in that: The draft angle of the partition rib in each area is 0.13° to 0.2°.

8. The high-capacity battery container with thickness gradient according to claim 1 or 2, characterized in that: The thickness of the area at the bottom of the rib is 1.6 to 1.8 mm; The thickness of the region located at the top of the rib is 1 to 1.1 mm.

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