Bipolar lead-acid storage battery

Abstract

The invention provides a bipolar lead-acid storage battery, which belongs to the technical field of storage batteries and solves the problem of poor performance of an existing bipolar lead-acid storage battery. The bipolar lead-acid storage battery comprises a shell and a top cover, wherein bipolar plates are arranged in the shell; the inner cavity of the shell is divided into a plurality of compartments by the bipolar plates; a battery monomer is arranged in each compartment; the shell is provided with a cover plate; the lower side surface of the cover plate is in sealing connection with the bipolar plates, and the upper side surface of the cover plate is in sealing connection with the top cover; the cavity of the top cover is divided into air chambers; a plurality of air chambers and a plurality of compartments correspond one by one and are communicated via through holes; and each air chamber is independently connected with a check valve. By use of the bipolar lead-acid storage battery, the battery monomers are protected from the interflowing of electrolyte while an active substance use ratio is guaranteed, the performance of the storage battery is improved, and meanwhile, the service life of the storage battery is improved.

Description

technical field [0001] The invention belongs to the technical field of accumulators and relates to a bipolar lead-acid accumulator. Background technique [0002] Lead-acid battery is a kind of battery whose electrodes are mainly made of lead and its oxide, and the electrolyte is sulfuric acid solution. Lead-acid battery is mainly composed of positive plate, negative plate, electrolyte, separator, battery tank, battery cover, etc. The top of the lead-acid battery has a plastic sealing cover with ventilation holes. [0003] For example, the Chinese Utility Model Patent Application (Application No.: 200920112517.4) discloses a bipolar lead-acid battery, including a casing, a positive terminal piece and a negative terminal piece drawn from the casing, and a sealed battery cover with a one-way valve. On the two side walls of the inner cavity of the housing, there are respectively provided positive and negative terminal plates parallel to each other, a layer of positive active ma...

AI Technical Summary

Problems solved by technology

[0003] For example, the Chinese Utility Model Patent Application (Application No.: 200920112517.4) discloses a bipolar lead-acid battery, including a casing, a positive terminal piece and a negative terminal piece drawn from the casing, and a sealed battery cover with a one-way valve. On the two side walls of the inner cavity of the housing, there are respectively provided positive and negative terminal plates parallel to each other, a layer of positive active material layer is provided on the side of the positive terminal plate close to the negative terminal plate, and a positive electrode active material layer is provided on the negative terminal plate. A layer of negative active material layer is arranged on the side of the plate close to the positive pole plate, and a plurality of bipolar plates parallel to the positive and negative pole plates are fixed between the positive and negative pole plates. The bipolar plate is made of carbon fiber substrate , the positive active material layer and the negative active material layer located on both sides of the substrate, the positive and negative active material layers are arranged in sequence, the bipolar plate divides the inner cavity of the shell into multiple compartments, and a diaphragm is arranged in the compartment, but the battery is charging. Exhaust is required during the process. In view of the small width of the compartments, it is difficult to install one-to-one check valves. Therefore, the multiple compartments of the battery are connected to one air chamber, and are exhausted through a one-way valve on the air chamber. Gas, that is, the upper parts of multiple compartments need to be connected, and it is difficult to individually seal each compartment. This structure is easy to cause electrolyte to cross between compartments, resulting in micro-short circuit, self-discharge, etc.

[0004] In view of the above problems, the Chinese invention patent application (application number: 03133542.X) discloses a bipolar storage battery, in which several intermediate single cells are fixed between the left side single cells and the right side single cells. The outer side of the single battery on the left side and the single battery on the right side are respectively fixed with a pressure plate, and a through hole is opened on the pressure plate on one side, and a safety valve is fixed in the through hole on the pressure plate, and the air chamber passes through the through hole are connected to each other, and the annular ring made of hydrophobic material is fixed in the through hole on the bipolar substrate. The compartments in this battery are still not separated from the air chambers, and are directly connected, and the compartments are still not individually sealed, and A one-way valve is used for exhaust, and after several compartments are connected through through holes, a hydrophobic ring is installed in the through holes to prevent the electrolyte from crossing each other. However, the hydrophobic ring is an external component, which has service life problems and is difficult to guarantee Absolutely block the electrolyte crossover, which also leads to the low specific energy of the battery, that is, the electrode material that participates in the electrode reaction emits low electric energy per unit mass. At the same time, the shell of the battery is preformed, and then the single battery is inserted into the shell Therefore, it is necessary to wrap the stacked cells in advance with adhesive tape or use a fixed frame for positioning, resulting in a larger specific volume of the battery, that is, a larger volume occupied by the battery per unit mass

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