Battery cover

Abstract

This utility model provides a battery cover, including a middle cover and a cover plate. The top surface of the middle cover has a cover plate groove, and each battery cell has an acid injection post corresponding to the cover plate groove. Each acid injection post has an acid injection hole in the middle, and a safety valve is provided on the acid injection post. The acid injection posts are divided into side acid injection posts located on both sides and a middle acid injection post located in the middle. Each end of the top surface of the middle cover has a terminal groove corresponding to one of the battery cells on both sides. The bottom surface of the cover plate groove at the middle acid injection post is lower than the bottom surface of the cover plate groove at the side acid injection posts, ensuring that the cavity volume above the electrode groups in each battery cell is consistent after the battery cover is assembled into a battery. This utility model reduces the internal space of the electrode groups located outside the battery terminals, ensuring that the cavity volume above the electrode groups in each cell is consistent. This ensures consistent internal pressure within the battery electrode groups and avoids high internal pressure in the side cells, which can cause sidewall bulging, leading to cell lagging and battery failure.

Description

Technical Field

[0001] This utility model belongs to the field of storage battery technology, and specifically relates to a storage battery cover. Background Technology

[0002] In existing valve-regulated lead-acid battery casings with a single-row series structure, each cell forms an independent sealed space after being sealed with the matching battery cover. According to the battery design, positive and negative terminal positions need to be set in the two cells at both ends, occupying a certain space. This results in the upper cavity volume of the terminal groups at both ends of the battery being smaller than that of the other terminal groups, as illustrated in utility model patent CN2150104Y. Figure 1 and Figure 2 As shown.

[0003] Actual measurements showed that cells with battery terminals had a 20% smaller upper space volume than other cells. Valve-regulated lead-acid batteries release gas during the later stages of charging. Because the gas occupies less space in cells with terminals, the pressure more easily reaches the safety valve's release value, leading to greater water loss in the outermost cells and affecting battery performance. This phenomenon is clearly correlated with the lagging cells identified in battery failure analysis. Utility Model Content

[0004] To address the aforementioned technical problems in the existing technology, this utility model provides a battery cover.

[0005] This utility model provides a battery cover, including a middle cover and a cover plate. The top surface of the middle cover is provided with a cover plate groove. Each battery cell in the cover plate groove is provided with an acid injection post. An acid injection hole is provided in the middle of the acid injection post. A safety valve is provided on the acid injection post. The acid injection post is divided into side acid injection posts located on both sides and a middle acid injection post located in the middle. Each end of the top surface of the middle cover is provided with a terminal groove corresponding to the battery cells on both sides. The bottom surface of the cover plate groove at the middle acid injection post is lower than the bottom surface of the cover plate groove at the side acid injection post, so that the cavity volume of the upper part of the electrode group in each battery cell is consistent after the battery cover is assembled into a battery.

[0006] Furthermore, the cover plate groove is provided with a total of 6 acid injection holes, and each acid injection hole is arranged in a row in a 1×6 manner.

[0007] Furthermore, the cover plate groove sinks at the middle acid injection hole column to form a sinking zone, and each middle acid injection hole column is located in the sinking zone, so that the height of the safety valve is not higher than the height of the bottom surface of the cover plate groove.

[0008] Furthermore, the cover plate abuts against the acid injection holes at both ends of the cover plate groove, and the cover plate groove is provided with a first venting groove at the acid injection holes for discharging the gas generated in the battery.

[0009] Furthermore, the bottom surface of the cover plate is provided with a limiting structure corresponding to the position of each intermediate acid injection hole post to prevent the safety valve from falling off the acid injection hole post.

[0010] Furthermore, the limiting structure is a limiting boss, which protrudes towards the safety valve.

[0011] Furthermore, the limiting protrusion is provided with an exhaust channel for discharging the gas generated in the battery.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention modifies the structural design of the battery casing cover, reducing the internal space of the non-terminal electrode groups. This ensures that the cavity volume above the electrode groups in each cell is consistent, guaranteeing uniform internal pressure within the battery electrode groups. It prevents high pressure in peripheral cells, which can cause sidewall bulging, cell lagging, and ultimately battery failure. The cover plate designed in this invention works in conjunction with the middle cover to meet the pressure requirements of each safety valve after battery assembly, preventing safety valves from detaching or failing to return to their original position after opening. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the battery cover of this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the battery cover of this utility model after the cover plate has been removed.

[0016] Figure 3 This is a top view of the battery cover of this utility model.

[0017] Figure 4 for Figure 3 Sectional view along the BB direction.

[0018] Figure 5 This is a schematic diagram of the structure of the cover plate of the battery cover of this utility model.

[0019] Reference numerals: middle cover 1, cover plate groove 11, acid injection hole column 12, terminal groove 13, sinking area 14, first exhaust groove 15, cover plate 2, limiting structure 21, exhaust channel 22. Detailed Implementation

[0020] like Figures 1-5 As shown, this utility model provides a battery cover, including a middle cover 1 and a cover plate 2.

[0021] The top surface of the middle cover 1 is provided with a cover plate groove 11. Each battery cell in the cover plate groove 11 is provided with an acid injection hole post 12. There are a total of 6 acid injection hole posts 12 in the cover plate groove 11, and the acid injection hole posts 12 are arranged in a row in a 1×6 manner.

[0022] The acid injection column 12 has an acid injection hole in the middle and a safety valve on it. The acid injection column 12 is divided into side acid injection columns on both sides and middle acid injection column in the middle. The top surface of the middle cover 1 has a terminal slot 13 at each end corresponding to the battery cell on both sides. The bottom surface of the cover slot 11 at the middle acid injection column is lower than the bottom surface of the cover slot 11 at the side acid injection column, so that the cavity volume of the upper part of the electrode group in each battery cell after the battery cover is assembled into a battery is consistent.

[0023] The cover plate groove 11 is recessed at each intermediate acid injection hole column to form a recessed area 14, and each intermediate acid injection hole column is located in the recessed area 14, so that the height of the safety valve is not higher than the height of the bottom surface of the cover plate groove. The cover plate groove 11 is also recessed at the side acid injection hole column to form a recessed area 14, and the side acid injection hole column is located within the recessed area 14.

[0024] The cover plate 2 abuts against the acid injection holes at both ends of the cover plate groove 11, and the cover plate groove 11 is provided with a first venting groove 15 at the acid injection holes to discharge the gas generated in the battery.

[0025] The bottom surface of the cover plate 2 has a protruding limiting structure 21 corresponding to the position of each intermediate acid injection hole post to prevent the safety valve from falling off the acid injection hole post. The limiting structure 21 is a limiting boss, which protrudes towards the safety valve. The limiting boss has an exhaust channel 22 for venting the gas generated in the battery.

[0026] During installation, first attach the middle cover to the battery, then install safety valves on each acid injection port, and finally cover with the cover plate. During use, because the cavity volume above the electrode group in each cell of the battery is consistent, after the gas is released during the later stages of charging in a valve-regulated lead-acid battery, the internal pressure of each cell is uniform. This prevents high pressure in the outer cells, which could cause sidewall bulging and make it easier for the pressure to reach the safety valve's release value, resulting in greater water loss and affecting battery performance.

Claims

1. A battery cover, comprising a middle cover and a cover plate, wherein the top surface of the middle cover is provided with a cover plate groove, and an acid injection hole post is provided in the cover plate groove corresponding to each battery cell, the acid injection hole post having an acid injection hole in the middle, the acid injection hole post being provided with a safety valve, the acid injection hole post being divided into side acid injection hole posts located on both sides and a middle acid injection hole post located in the middle, and each end of the top surface of the middle cover having a terminal groove corresponding to the battery cells on both sides, characterized in that, The bottom surface of the cover groove at the middle acid injection hole column is lower than the bottom surface of the cover groove at the side acid injection hole column, so that the cavity volume of the upper part of the electrode group in each battery cell after the battery cover is assembled into a battery is consistent.

2. The battery cover according to claim 1, characterized in that, The cover plate groove is provided with a total of 6 acid injection holes, and the acid injection holes are arranged in a row in a 1×6 manner.

3. The battery cover according to claim 2, characterized in that, The cover plate groove sinks down at the middle acid injection hole column to form a sinking zone, and each middle acid injection hole column is located in the sinking zone.

4. The battery cover according to claim 3, characterized in that, The cover plate abuts against the acid injection holes at both ends of the cover plate groove, and the cover plate groove is provided with a first venting groove at the acid injection holes.

5. The battery cover according to claim 1, characterized in that, The bottom surface of the cover plate is provided with a limiting structure to prevent the safety valve from falling off the acid injection hole column at the position corresponding to each intermediate acid injection hole column.

6. The battery cover according to claim 5, characterized in that, The limiting structure is a limiting boss, which protrudes towards the safety valve.

7. The battery cover according to claim 6, characterized in that, The limiting boss is provided with an exhaust channel.

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