Double-layer sealing acid-leakage-proof battery protection cover

Abstract

The utility model provides a double-layer sealing acid-leakage-proof battery protection cover. The double-layer sealing acid-leakage-proof battery protection cover comprises a middle cover and an exhaust cover, a first exhaust hole and a second exhaust hole are formed in the middle cover, the first exhaust hole is communicated with the interior of the lead-acid storage battery, and the second exhaust hole is communicated with the external environment; the exhaust cover is mounted on the middle cover; the exhaust cover comprises a first gas filtering sheet and a second gas filtering sheet; the first exhaust hole is communicated with the second exhaust hole after passing through the first air filtering sheet and the second air filtering sheet in sequence; according to the equipment disclosed by the utility model, the exhaust cover is arranged on the exhaust hole, and the first air filtering sheet and the second air filtering sheet are arranged on the exhaust cover, so that sulfuric acid in the lead-acid storage battery is effectively prevented from flowing out by utilizing the hydrophobic property of the air filtering sheets, and when the storage battery inclines and turns on one side, the double-layer air filtering sheet structure can also prevent the sulfuric acid from leaking out within a certain time; and the safety performance of the lead-acid storage battery is improved.

Description

Double-layer sealed battery cover to prevent acid leakage Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a double-layer sealed battery protection cover to prevent acid leakage. Background Technology

[0002] During the discharge process of a lead-acid battery, the positive electrode (PbO2) reacts to form PbSO4 (lead sulfate), and the negative electrode (Pb) also reacts to form PbSO4, resulting in a decrease in the concentration of sulfuric acid in the electrolyte. The reaction formula can be expressed as: PbO2 + Pb + 2H2SO4 → 2PbSO4 + 2H2O.

[0003] During the charging process of a lead-acid battery, PbSO4 is reduced back to PbO2 at the positive electrode and back to Pb at the negative electrode. At the same time, the water content in the electrolyte decreases and the sulfuric acid concentration increases. The reaction can be expressed as: 2PbSO4 + 2H2O → PbO2 + Pb + 2H2SO4.

[0004] At the end of a normal charge, the electrode reaction is basically complete. If charging continues, there will not be enough PbSO4 on the plates to participate in the reaction, and the battery will begin to electrolyze water to produce hydrogen and oxygen. Therefore, if the lead-acid battery is completely sealed, the internal pressure will increase, leading to problems such as bulging and deformation. To prevent battery deformation, vent holes need to be made on the lead-acid battery casing to allow excess gas to escape and maintain stable internal pressure.

[0005] A maintenance-free lead-acid battery consists of plates and an outer casing made up of a housing, a middle cover, and a vent cover. Typically, the space between the middle cover and the vent cover forms a labyrinth structure that prevents acid reflux. The end of the labyrinth structure, which connects to the outside of the battery, is the venting system, which is usually composed of a filter.

[0006] Currently, ordinary maintenance-free lead-acid batteries with liquid sealing do not have the function of preventing acid leakage when inverted. During normal vehicle operation, the sulfuric acid inside will not flow out from the vent. However, in extreme cases, the vehicle may roll over or become inverted. In such cases, the sulfuric acid inside the lead-acid battery may flow out from the vent, which may corrode the metal equipment on the vehicle or pollute the environment. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a double-layer sealed battery protection cover to prevent acid leakage, so as to solve the above-mentioned disadvantages.

[0008] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a double-layer sealed battery protection cover to prevent acid leakage, comprising: a middle cover and a vent cover; the middle cover is provided with a first vent hole and a second vent hole, wherein the first vent hole is connected to the interior of the lead-acid battery, and the second vent hole is connected to the external environment; the vent cover is installed on the middle cover; the vent cover comprises: a first filter and a second filter; the first vent hole is connected to the second vent hole after passing through the first filter and the second filter in sequence.

[0009] In one embodiment, the exhaust cover includes: a first connecting channel, a second connecting channel, and a sealing channel; the first connecting channel is connected to the first exhaust hole; the first connecting channel is also connected to the sealing channel after passing through the first air filter; the second connecting channel is connected to the second exhaust hole; the second connecting channel is also connected to the sealing channel after passing through the second air filter.

[0010] In one embodiment, both the first vent and the second vent are arranged along a first direction; the sealing channel is arranged along a second direction, and the first direction intersects the second direction.

[0011] In one embodiment, the exhaust cover further includes an upper cover and a lower cover; the first connecting channel and the second connecting channel are formed on the lower cover; the upper cover covers the lower cover to form the sealing channel; the lower cover also has a first through hole and a second through hole; the first connecting channel communicates with the sealing channel after passing through the first through hole; the second connecting channel communicates with the sealing channel after passing through the second through hole; the first filter sheet covers the first through hole, and the second filter sheet covers the second through hole.

[0012] In one embodiment, both the first through hole and the second through hole are formed along a third direction; the first direction, the second direction, and the third direction intersect each other.

[0013] In one embodiment, the middle cover is provided with a limiting groove for accommodating the exhaust cover, and both the first exhaust hole and the second exhaust hole are connected to the limiting groove;

[0014] When the exhaust cover is installed in the limiting groove, the first exhaust hole is connected to the first connecting channel, and the second exhaust hole is connected to the second connecting channel.

[0015] In one embodiment, the upper end cover and the lower end cover are fixed together by heat fusion.

[0016] In one embodiment, the upper end cover and the lower end cover are fixed together by ultrasonic welding.

[0017] In one embodiment, the upper surfaces of the lower end cap and the middle cap are located on the same plane.

[0018] In one embodiment, the lower end cover and the middle cover are integrally formed.

[0019] In summary, this utility model has the following beneficial effects: a double-layer sealed battery protection cover to prevent acid leakage, comprising: a middle cover and an exhaust cover; the middle cover has a first exhaust hole and a second exhaust hole, wherein the first exhaust hole is connected to the interior of the lead-acid battery, and the second exhaust hole is connected to the external environment; the exhaust cover is installed on the middle cover; the exhaust cover includes: a first filter and a second filter; the first exhaust hole is connected to the second exhaust hole after passing through the first filter and the second filter in sequence; using the device of this utility model, an exhaust cover is set on the exhaust hole, and the exhaust cover is provided with a first filter and a second filter. The hydrophobic properties of the filter effectively prevent sulfuric acid from flowing out of the lead-acid battery. When the battery is tilted or overturned, the double-layer filter structure can also block sulfuric acid leakage for a certain period of time, thus improving the safety performance of the lead-acid battery. Attached Figure Description

[0020] Figure 1 is a three-dimensional overall structural diagram of the double-layer sealed anti-acid battery protection cover of this utility model;

[0021] Figure 2 is a schematic diagram of the overall structure of the exhaust cover of this utility model;

[0022] Figure 3 is a cross-sectional view of part AA in Figure 2 of this utility model;

[0023] Figure 4 is an exploded view of the internal structure of this utility model as shown in Figure 3;

[0024] In the diagram: 1. Middle cover; 12. Second exhaust port; 2. Exhaust cover; 21. First filter plate; 22. Second filter plate; 23. First connecting channel; 24. Second connecting channel; 25. Sealing channel; 26. Upper end cover; 27. Lower end cover; 28. First through hole; 29. ​​Second through hole. Detailed Implementation

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0026] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] The following descriptions of directions are defined as follows:

[0030] Directions A1 and A2 are the first direction; directions B1 and B2 are the second direction; and directions C1 and C2 are the third direction. In this embodiment, the first and second directions are both located on a horizontal plane, and the negative direction of the third direction is the same as the direction of gravity, with the direction along the direction of gravity being the lower side and the direction opposite to the direction of gravity being the upper side.

[0031] As shown in Figures 1-4, a middle cover 1 is provided on the outer casing to allow the gas inside the lead-acid battery to escape smoothly. The middle cover 1 has an exhaust port for gas release. To prevent sulfuric acid from flowing out of the battery through the exhaust port, an exhaust cap 2 is also provided on the middle cover 1. The exhaust cap 2 divides the exhaust port into a first exhaust port and a second exhaust port 12. The first exhaust port is connected to the interior of the lead-acid battery, while the second exhaust port 12 is connected to the external environment. The first exhaust port can only connect to the external environment through the exhaust cap 2. Along the flow direction of sulfuric acid, the exhaust cap 2 is sequentially provided with: a first connecting channel 23, a first filter 21, a sealing channel 25, a second filter 22, and a second connecting channel 24. The first connecting channel 23 is connected to the first exhaust port; the first connecting channel 23 also connects to the sealing channel 25 after passing through the first filter 21; the second connecting channel 24 is connected to the second exhaust port 12; the second connecting channel 24 also connects to the sealing channel 25 after passing through the second filter 22. The first vent and the second vent 12 are both arranged along the first direction; the sealing channel 25 is arranged along the second direction. The first direction and the second direction intersect, that is, there is a certain angle between the first vent, the sealing channel 25 and the second vent 12. When the battery is tilted or overturned, there will likely be a part of the channel in a vertical state. The pressure on the filter plate located at the high position will be relatively small, which can also effectively slow down the time for sulfuric acid to pass through the filter plate and reduce the risk of sulfuric acid leakage.

[0032] The exhaust cover 2 also includes an upper cover 26 and a lower cover 27; the lower surface of the lower cover 27 and the upper surface of the middle cover 1 are fitted together on the same plane; the upper cover 26 and the lower cover 27 are fixed together to form a whole. To improve the connection stability between the upper cover 26 and the lower cover 27, the upper cover 26 and the lower cover 27 are fixed together by heat fusion or ultrasonic welding; the first connecting channel 23 and the second connecting channel 24 are opened near the bottom of the lower cover 27; the upper cover 26 covers the lower cover 27, forming a sealing channel 25 near the top of the exhaust cover 2; in order to connect... The lower end cover 27 has two channels, one above the other. A first through hole 28 and a second through hole 29 are also provided on the lower end cover 27. Both the first through hole 28 and the second through hole 29 are opened upward along a third direction to achieve through connection. The first connecting channel 23 is connected to the sealing channel 25 after passing through the first through hole 28. The second connecting channel 24 is connected to the sealing channel 25 after passing through the second through hole 29. The first filter plate 21 covers the first through hole 28 and the second filter plate 22 covers the second through hole 29, forming two interceptions for sulfuric acid entering the exhaust cover 2, delaying the time of sulfuric acid leakage and reducing the risk of leakage.

[0033] In actual use, the first vent hole, which is connected to the inside of the battery, passes through the first filter 21 and the second filter 22 in sequence before connecting to the second vent hole 12. The filter is hydrophobic. When the battery is upright, the gas generated inside the battery will first pass through the first filter 21 and then through the second filter 22 through the vent holes on the middle cover 1 and the vent cover 2, and then be discharged from the second vent hole 12 to the outside of the battery. The moisture in the gas will be intercepted by the hydrophobic properties of the first filter 21 and will not enter the interior of the vent cover 2, thus preventing leakage.

[0034] When the battery is tilted or inverted, the acid inside the battery flows through the first vent to the first filter 21. Upon reaching the first filter, the acid is blocked outside due to the filter's hydrophobic properties. However, because the battery is inverted and may still be charging, the acid flowing to the filter will be under pressure, which will accelerate acid penetration. As the internal pressure of the battery increases and after prolonged immersion, the acid will still slowly pass through the first filter 21, but this process effectively delays the time it takes for the acid to flow out of the vent.

[0035] The acid that permeates through the first filter 21 does not flow directly to the outside, but instead enters the channel in the vent cover 2. The acid entering the sealed channel 25 is further blocked by the hydrophobicity of the second filter 22. Furthermore, the obstruction of the acid by the first filter 21 reduces the pressure of the acid in the sealed channel 25. In other words, only when enough acid accumulates in the sealed channel 25 and reaches a certain pressure will it permeate through the second filter 22. This two-stage, double-layer filter structure effectively slows down the rate at which acid flows out of the vent when the battery is tilted or inverted.

[0036] The middle cover 1 has a limiting groove (not shown in the figure) for accommodating the vent cover 2. The shape of the limiting groove is adapted to the shape of the vent cover 2, and the limiting groove can just accommodate the vent cover 2. The first vent hole and the second vent hole 12 are both connected to the limiting groove. When the vent cover 2 is installed in the limiting groove, the first vent hole is connected to the first connecting channel 23, and the second vent hole 12 is connected to the second connecting channel, so as to form a single channel for sulfuric acid, which can smoothly discharge gas while reducing the risk of sulfuric acid leakage. The limiting groove is set on the middle cover 1, and the first vent hole and the second vent hole 12 are both connected to the limiting groove. During the production process, a direct return device can also be installed in the limiting groove to allow the liquid flowing out of the battery to return to the inside of the battery, realizing the return of acid.

[0037] Example 2

[0038] To reduce the heat sealing process and lower the probability of leakage, the lower end cover 27 is integrally formed with the middle cover 1, and then the upper end cover 26 and the lower end cover 27 are heat-sealed together to form a sealing channel 25. This reduces one heat sealing process and also reduces the gap between the lower end cover 27 and the middle cover 1, thus lowering the risk of leakage.

[0039] Example 3

[0040] For ordinary maintenance-free batteries, where it is not necessary to strictly limit leakage when inverted, the installation of the first filter 21 (or the second filter 22) and the sealing process of the sealing channel 25 can be omitted, and only the second filter 22 (or the first filter 21) can be retained to balance the manufacturing cost of the battery.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A double-layer sealed battery protection cover to prevent acid leakage, characterized in that, include: The battery includes a middle cover and an exhaust cover. The middle cover has a first exhaust port and a second exhaust port, wherein the first exhaust port is connected to the interior of the lead-acid battery, and the second exhaust port is connected to the external environment. The exhaust cover is installed on the middle cover. The exhaust cover includes a first filter and a second filter. The first exhaust port is connected to the second exhaust port after passing through the first filter and the second filter in sequence.

2. The double-layer sealed battery protection cover for preventing acid leakage according to claim 1, characterized in that, The exhaust cover includes: a first connecting channel, a second connecting channel, and a sealing channel; the first connecting channel is connected to the first exhaust hole; the first connecting channel is also connected to the sealing channel after passing through the first air filter; the second connecting channel is connected to the second exhaust hole; the second connecting channel is also connected to the sealing channel after passing through the second air filter.

3. The double-layer sealed battery protection cover for preventing acid leakage according to claim 2, characterized in that, The first vent and the second vent are both arranged along the first direction; the sealing channel is arranged along the second direction, and the first direction and the second direction intersect.

4. The double-layer sealed acid-proof battery protection cover according to claim 3, characterized in that, The exhaust cover also includes an upper cover and a lower cover; the first connecting channel and the second connecting channel are formed on the lower cover; the upper cover covers the lower cover to form the sealing channel; the lower cover also has a first through hole and a second through hole; the first connecting channel communicates with the sealing channel after passing through the first through hole; the second connecting channel communicates with the sealing channel after passing through the second through hole; the first filter sheet covers the first through hole, and the second filter sheet covers the second through hole.

5. The double-layer sealed battery protection cover for preventing acid leakage according to claim 4, characterized in that, Both the first through hole and the second through hole are opened along a third direction; the first direction, the second direction and the third direction intersect each other.

6. The double-layer sealed battery protection cover for preventing acid leakage according to claim 2, characterized in that, The middle cover has a limiting groove for accommodating the exhaust cover, and both the first exhaust hole and the second exhaust hole are connected to the limiting groove; when the exhaust cover is installed in the limiting groove, the first exhaust hole is connected to the first connecting channel, and the second exhaust hole is connected to the second connecting channel.

7. The double-layer sealed battery protection cover for preventing acid leakage according to claim 4, characterized in that, The upper end cap and the lower end cap are fixed together by heat fusion.

8. The double-layer sealed battery protection cover for preventing acid leakage according to claim 4, characterized in that, The upper end cover and the lower end cover are fixed together by ultrasonic welding.

9. The double-layer sealed battery protection cover for preventing acid leakage according to claim 4, characterized in that, The lower end cap and the upper surface of the middle cap are located on the same plane.

10. The double-layer sealed battery protection cover for preventing acid leakage according to claim 9, characterized in that, The lower end cover and the middle cover are integrally formed.

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