Lead-acid battery electrolyte for UPS

Abstract

The invention discloses a lead-acid battery electrolyte for UPS, comprising the following components: sulfuric acid, dicarboxypropylenetriamine, stannous sulfate, cysteine ​​and deionized water. The invention improves the low-temperature charging acceptance of the battery, increases the battery capacity, and solves the problem of irreversible capacity attenuation caused by long-term non-charging of the lead-acid battery.

Description

Technical Field

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

[0002] With the rapid development of artificial intelligence, the demand for data storage and computing is increasing. Data centers as data storage platforms are also booming. Batteries, as a medium for storing electrical energy, play an emergency short-term discharge role in data centers.

[0003] Due to the particularity of the industry, high requirements are placed on safety. At present, lead-acid batteries are used mainstream. Since the discharge capacity of lead-acid batteries decays greatly in low temperature environments and their charging acceptance capacity is poor, long-term operation in this environment will cause the battery to run out of power. In the event of a sudden power outage, they will not be able to play an emergency role, causing data loss and causing immeasurable losses. At present, in order to ensure the battery usage status, data centers are equipped with air conditioners to ensure that the ambient temperature is around 25°C, which will result in high power consumption in the data center.

[0004] The construction period of a data center is relatively long, generally about one year, and after completion, most of them need to be rented to customers. This will cause the batteries to be stored for a long period of time on site, and the batteries cannot be charged and maintained in time, which will cause irreversible sulfation inside the plates and capacity decay, making it impossible to meet user requirements.

[0005] Traditional UPS uses lead-acid batteries, which have defects such as rapid capacity decay at low temperatures, poor charging acceptance, and rapid capacity decay when not charged for a long time. Customers need to allocate additional resources, wasting a lot of manpower and material resources. Summary of the invention

[0006] In view of this, the present invention provides a lead-acid battery electrolyte for UPS, which aims to improve the problems of poor discharge and charge acceptance of traditional lead-acid batteries at low temperatures, and irreversible capacity decay caused by long-term non-charging.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows: A lead-acid battery electrolyte for UPS comprises the following components: sulfuric acid, dicarboxypropylenetriamine, stannous sulfate, cysteine ​​and deionized water.

[0008] Furthermore, the proportions of each group are as follows: sulfuric acid 30%-45%; dicarboxypropylenetriamine 0.05%~0.5%; cysteine ​​0.05%~0.2%; stannous sulfate 0.05%~0.6%; water 53.7%~69.85%.

[0009] The beneficial effects of the present invention are as follows: The invention discloses a lead-acid battery electrolyte for UPS. Dicarboxypropylenetriamine is added to the electrolyte. The dicarboxypropylenetriamine contains a large amount of carboxyl groups (-COOH) and can form a stable complex with lead ions (Pb2+) in insoluble lead sulfate. The lead ions are released during the self-discharge process of the battery, and the battery does not generate irreversible lead sulfate during long-term storage. Stannous sulfate is added. During the charging process, Sn2+ is reduced to metal Sn at the negative electrode, thereby increasing the conductive bridge between lead pastes, improving the charging acceptance under low temperature conditions, and increasing the negative electrode discharge capacity. Cysteine ​​is added. The cysteine ​​contains a large amount of thiol groups (-SH). The cysteine ​​groups are complexed with metal lead ions and release lead ions together with carboxyl groups in dicarboxymalonate during the battery charging process, so that more free lead ions exist on the positive and negative electrode plates, and the low-temperature charging current and charging acceptance of the battery are improved, thereby improving the low-temperature performance of the battery. DETAILED DESCRIPTION

[0010] The present invention is described below through specific implementation cases.

[0011] Embodiment 1: The lead-acid battery electrolyte for UPS of the present embodiment includes the following components in parts by weight: 30% sulfuric acid; 0.05% sodium dicarboxymalonate; 0.05% cysteine; 0.05% stannous sulfate; and 69.85% water.

[0012] Embodiment 2: The lead-acid battery electrolyte for UPS of the present embodiment includes the following components in parts by weight: 40% sulfuric acid; 0.3% sodium dicarboxymalonate; 0.1% cysteine; 0.3% stannous sulfate; and 59.3% water.

[0013] Embodiment 3: The lead-acid battery electrolyte for UPS of the present embodiment includes the following components in parts by weight: 45% sulfuric acid; 0.5% sodium dicarboxymalonate; 0.2% cysteine; 0.6% stannous sulfate; and 53.7% water.

[0014] Comparative Example 1: This comparative example is a lead-acid battery electrolyte for UPS, which is different from Example 1 only in that no dicarboxy sodium malonate is added.

[0015] Comparative Example 2: This comparative example is a lead-acid battery electrolyte for UPS, which is different from Example 1 only in that cysteine ​​and stannous sulfate are not added.

[0016] The electrolytes produced in each group were assembled into batteries and then performance tested. The method is as follows: a 12V630W battery is assembled with negative electrode material Pb, positive electrode material PbO2 and AGM diaphragm, and the electrolytes prepared in Examples 1-3 and Comparative Examples 1-2 are respectively injected into the 12V630W battery.

[0017] In order to further prove the effect of the present invention, the following test method is provided: 0℃ low temperature discharge power test method: Place the fully charged battery in a 0℃ low temperature box for no less than 16h, discharge it in the low temperature box at the rated power of the battery, record the discharge time, and compare it with the discharge time in a 25℃ environment.

[0018] Static charge acceptance: A fully charged battery is discharged at a temperature of 25°C for 5 hours at a current of I0, where I0 = Ce / 10 (Ah), Ce (Ah) is the maximum value of the battery's 3-time capacity. After the discharge, the battery is immediately placed in a low-temperature box at a temperature of 0°C for at least 20 hours. The battery is taken out of the low-temperature box and charged at a constant voltage of 14.4V within 1 minute. After 10 minutes, the charging current Ica is recorded, and the ratio of Ica / I0 is not less than 2.5.

[0019] Self-discharge recovery test: fully charged battery test C 10 After the capacity is fully charged, it is stored in an open circuit at 60℃ for 6 months and then fully charged again to test C 10 , compare the C before and after the test 10 The test results are shown in Table 1: Table 1 Comparison of different components and properties of Examples 1-3 and Comparative Examples 1-2 It can be seen from Table 1 that the static charge acceptance, 0°C low-temperature discharge power and self-discharge recovery ability of Examples 1-3 of the present invention are all better than those of Comparative Examples 1-2. In the present invention, dicarboxypropylenetriamine is added to the electrolyte, which contains a large amount of carboxyl groups (-COOH), which can form a stable complex with lead ions (Pb2+) in insoluble lead sulfate, and lead ions are released during the self-discharge process of the battery. The battery will not produce irreversible lead sulfate during long-term storage; stannous sulfate is added, and Sn2+ is reduced to metallic Sn at the negative electrode during the charging process, which increases the conductivity between the lead pastes. Bridge, improve the charging acceptance under low temperature conditions, and increase the negative electrode discharge capacity; add cysteine, cysteine ​​contains a high amount of thiol (-SH), which complexes with metal lead ions and releases lead ions together with the carboxyl group in dicarboxymalonate during battery charging, so that there are more free lead ions on the positive and negative plates, and the low-temperature charging current and charging acceptance of the battery are improved, thereby improving the low-temperature performance of the battery. UPS lead-acid batteries can be used in an environment of 0℃, saving energy and reducing consumption. At the same time, the battery reduces the number of battery maintenance and charging times, saving manpower and material resources.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lead-acid battery electrolyte for UPS, characterized in that: The invention comprises the following components: sulfuric acid, dicarboxypropylenetriamine, stannous sulfate, cysteine ​​and deionized water.

2. A lead-acid battery electrolyte for UPS according to claim 1, characterized in that: The distribution ratio of each group is as follows: sulfuric acid 30%-45%, dicarboxypropylenetriamine 0.05%~0.5%, cysteine ​​0.05%~0.2%, stannous sulfate 0.05%~0.6%, and water 53.7%~69.85%.

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