Lead-acid battery having long service life

Abstract

Disclosed in the present invention is a lead-acid battery having a long service life, comprising negative electrode plates and positive electrode plates, wherein a plurality of groups of positive electrode plates and a plurality of groups of negative electrode plates are alternately stacked at intervals to form a battery electrode group, the top end of the battery electrode group is connected to poles, fastening nuts are threadedly connected to the outer walls of the top ends of the poles, and the fastening nuts are in threaded fit with corresponding battery cover pole holes, so that the fastening nuts continue to move downwards and continuously press corresponding gaskets, and the gaskets transmit a pressure to corresponding rubber rings to finally cause deformation of the rubber rings. During use of the battery of the present invention, as the bottom of the positive electrode plates is suspended, the electrode plates can freely grow in the height direction, and in addition, as the internal width of a battery case is larger than that of the electrode plates, the electrode plates can also freely grow in the width direction. The bottom of the negative electrode plates is provided with two sets of electrode plate feet, and along with the growth of the electrode plates, the electrode plate feet can be gradually opened so as to provide a space for the electrode plates to grow.

Description

A long-life lead-acid battery Technical Field

[0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a long-life lead-acid battery. Background Art

[0002] A lead-acid battery consists of a positive plate, a negative plate, and a separator. During the battery's use, as the battery undergoes continuous charge and discharge cycles, the volume of the reactants on the grid surface continuously expands and contracts, causing the plates to grow continuously. During discharge, the lead dioxide on the positive plate surface is reduced to lead sulfate. The molar volume of lead sulfate is 92% larger than that of lead dioxide. During charging, the volume of the material on the positive grid surface decreases by 92%, and during discharge, the volume of the material on the positive grid surface decreases by another 92%. As the volume of the reactants continues to change, the grid, which acts as a carrier for the reactants, is constantly squeezed by the reactants, causing it to grow continuously, ultimately causing the positive plate to grow.

[0003] During the charge-discharge cycle, the negative plate, which serves as the battery's negative electrode, reacts primarily with spongy lead. The lead sulfate formed by discharge compacts the reactants, reducing pressure on the grid. Therefore, the negative plate barely grows during use.

[0004] Given that lead-acid batteries inevitably grow during use, this is an even more crucial consideration for long-life batteries. Battery design requires space for plate growth to prevent stress-induced cracking of the housing and plate breakage. Generally, space is reserved for the plate width, meaning the plate width is 8-12mm smaller than the internal width of the battery housing.

[0005] Therefore, in order to avoid battery failure caused by the vertical growth of the battery pole group, the current mainstream designs in the industry are the pole group growth upward design and the pole group growth downward design.

[0006] The pole-cluster growth design utilizes an interference fit between the rubber seal and the battery cover during the design of the pole seal. This seals the pole while allowing the terminals to gradually rise as the pole cluster grows. However, because the positive pole primarily grows, with little growth at the negative pole, this results in differences in the height of the positive and negative poles. During use, battery packs require connecting different numbers of cells in series to achieve the required voltage. During installation, the positive and negative poles of adjacent cells are aligned and tightly connected. However, as the batteries use, the positive pole grows much faster than the negative pole, resulting in differences in the height of the positive and negative poles at either end of the same connecting cable. For batteries that discharge power, copper busbars are typically used for rigid connections to meet discharge requirements. This can cause stress on the terminals, accelerating battery damage. Furthermore, due to the limited dimensions of the terminals and battery cover, the pole-cluster growth design generally only allows for a maximum of 8mm of pole cluster growth. This height limitation limits the height of the battery cluster. If growth exceeds the design, the pole cluster will expire prematurely.

[0007] For designs that increase the electrode group below, a compressible flexible member, typically made of foam or polyethylene, is typically placed beneath the electrode group. This flexible member typically elevates the positive and negative plates to the same height, without separating them. This results in a larger increase in the positive plate, while the negative plate experiences minimal increase. This placement of the positive and negative plates above the same flexible member results in uneven stress on the electrode group during battery operation, leading to premature end-of-life.

[0008] Summary of the Invention

[0009] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0010] A long-life lead-acid battery includes negative plates and positive plates. Multiple groups of positive plates and multiple groups of negative plates are alternately stacked to form a battery electrode group. The tops of the battery electrode groups are all connected and installed with poles. The outer walls of the tops of the poles are threadedly connected with fastening nuts. The fastening nuts are threadedly engaged with the pole hole in the battery cover, so that the fastening nuts continue to move downward and continuously squeeze the gasket; the gasket transmits pressure to the rubber ring, eventually causing the rubber ring to deform.

[0011] Fill the gap between the terminal and the terminal hole of the battery cover to achieve a preliminary sealing effect.

[0012] As a preferred embodiment of the above technical solution, the pole is poured with colored glue through the top of the fastening nut.

[0013] This achieves the purpose of sealing and fixing the pole.

[0014] As a preferred embodiment of the above technical solution, plug-in blocks are fixedly installed on both sides of the bottom end of the battery cover, and the bottom ends of the plug-in blocks are plugged into grooves with sealing gaskets glued thereto, and the grooves are opened on the outer wall of the battery pole group.

[0015] The coordinated use of the plug-in block and the sealing gasket improves the installation stability between the battery cover and the battery group.

[0016] As a preferred embodiment of the above technical solution, two plate feet are symmetrically provided on the bottom of the negative plate along its central axis.

[0017] The negative plate can support the weight of the plate through the plate foot, and different control measures are adopted for the growth of unused plates.

[0018] As a preferred embodiment of the above technical solution, the plate surface height of the positive electrode plate is lower than that of the negative electrode plate.

[0019] During the battery assembly process, the positive plate is suspended through the coordination of the pole and the battery cover, thereby reserving space for the growth of the positive plate.

[0020] The beneficial effects of the present invention are:

[0021] During battery use, the positive plate's bottom is suspended, allowing it to grow freely in height. Since the battery case's interior width is greater than the plate's, it also allows it to grow freely in width. The negative plate has two sets of plate feet at its bottom. As the plate grows, these feet gradually expand to provide room for growth. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a front cross-sectional structure provided by an embodiment of the present invention;

[0023] FIG2 is a schematic diagram showing an enlarged structure of point A in FIG1 according to an embodiment of the present invention;

[0024] FIG3 is a schematic diagram showing a partial top view of the fastening nut in FIG2 according to an embodiment of the present invention;

[0025] FIG4 is a schematic front cross-sectional view of the fastening nut in FIG3 provided by an embodiment of the present invention.

[0026] Legend:

[0027] 1. Negative plate; 2. Positive plate; 3. Color glue; 4. Fastening nut; 5. Washer; 6. Rubber ring; 7. Connector block; 8. Sealing gasket; 9. Plate foot. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0029] As shown in Figures 1, 2, 3 and 4, in the embodiment of the present invention, a negative electrode plate 1 and a positive electrode plate 2 are included, and multiple groups of positive electrode plates 2 and multiple groups of negative electrode plates 1 are alternately stacked to form a battery electrode group. The top of the battery electrode group is connected and installed with a pole, and the outer wall of the top of the pole is threadedly connected with a fastening nut 4. The fastening nut 4 is threadedly matched with the pole hole of the battery cover, so that the fastening nut 4 continues to move downward and continuously squeezes the washer 5; the washer 5 transmits pressure to the rubber ring 6, which eventually causes the rubber ring 6 to deform.

[0030] Fill the gap between the terminal and the terminal hole of the battery cover to achieve a preliminary sealing effect.

[0031] As shown in FIG1 and FIG2 , the pole passes through the top of the fastening nut 4 and is poured with colored glue 3 .

[0032] This achieves the purpose of sealing and fixing the pole.

[0033] As shown in FIG2 , plug-in blocks 7 are fixedly mounted on both sides of the bottom of the battery cover, and the bottom ends of the plug-in blocks 7 are plugged into grooves to which sealing gaskets 8 are glued, and the grooves are opened on the outer wall of the battery pole group.

[0034] With the coordinated use of the plug-in block 7 and the sealing gasket 8, the installation stability between the battery cover and the battery pole group is improved.

[0035] As shown in FIG1 , two plate feet 9 are symmetrically provided at the bottom of the negative plate 1 along its central axis.

[0036] The negative plate 1 can support the weight of the plate through the plate foot 9, and different control measures are adopted for the increase in the amount of unused plates.

[0037] As shown in FIG1 , the positive electrode plate 2 has a lower plate surface height than the negative electrode plate 1 .

[0038] During the battery assembly process, the positive plate 2 is suspended in the air through the cooperation of the pole and the battery cover, thereby reserving space for the growth of the positive plate 2.

[0039] Working principle: During the assembly process of the battery, as the fastening nut 4 rotates, the pole terminal is gradually raised. When the internal thread of the fastening nut 4 passes through all the pole threads, the pole is lifted to a certain height, and the pole thread is disengaged from the thread fit between the fastening nut 4; the fastening nut 4 continues to rotate, and due to the thread fit between the fastening nut 4 and the pole hole of the battery cover, the fastening nut 4 continues to move downward and continuously squeezes the gasket 5; the pressure is transmitted to the rubber ring 6 through the gasket 5, which eventually causes the rubber ring 6 to deform and fill the gap between the pole and the pole hole of the battery cover, thereby achieving a preliminary sealing effect; the colored glue 3 continues to be poured on the upper part of the fastening nut 4 to achieve the purpose of sealing and fixing the pole.

[0040] Because the pole and the pole group are connected together, when the fastening nut 4 is rotated to cause the pole to rise, the pole group is also raised and gradually suspended in the air; because the growth rate of the positive plate 2 is relatively large, this pole structure design is only used for the positive terminal; the lifting height of the positive plate 2 is determined by the height of the thread on the outer surface of the pole; because the tooth spacing inside the fastening nut 4 is much larger than the tooth spacing of the external thread, during the rotation of the fastening nut 4, the thread of the pole terminal first disengages from the thread of the fastening nut 4, and at the same time, due to the obstruction of the external thread of the pole terminal, the pole will not fall off.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A long-life lead-acid battery, comprising a negative plate (1) and a positive plate (2), characterized in that: A plurality of groups of positive plates (2) and a plurality of groups of negative plates (1) are alternately stacked to form a battery pole group. The top of each battery pole group is connected and installed with a pole column. The outer wall of the top of the pole column is threadedly connected with a fastening nut (4). The fastening nut (4) is threadedly matched with the pole column hole of the battery cover, so that the fastening nut (4) continues to move downward and continuously squeezes the gasket (5); the gasket (5) transmits pressure to the rubber ring (6), which eventually causes the rubber ring (6) to deform.

2. A long-life lead-acid battery according to claim 1, characterized in that: The top of the pole passing through the fastening nut (4) is cast with colored glue (3).

3. A long-life lead-acid battery according to claim 1, characterized in that: Plug-in blocks (7) are fixedly installed on both sides of the bottom end of the battery cover, and the bottom ends of the plug-in blocks (7) are all plugged into grooves glued with sealing gaskets (8), and the grooves are opened on the outer wall of the battery pole group.

4. A long-life lead-acid battery according to claim 1, characterized in that: Two plate feet (9) are symmetrically arranged at the bottom of the negative plate (1) along its central axis.

5. A long-life lead-acid battery according to claim 1, characterized in that: The plate surface height of the positive plate (2) is lower than that of the negative plate (1).

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