Lead-acid storage battery for UPS (Uninterrupted Power Supply) and manufacturing method

Abstract

The invention provides a lead-acid storage battery method for a UPS (Uninterrupted Power Supply), which comprises a battery shell, the battery shell comprises six single-cell inner cavities, a positive plate, a diaphragm and a negative plate are sequentially arranged in each single-cell inner cavity and are filled with electrolyte, the positive plates and the negative plates are respectively connected in parallel through busbars, two adjacent single-cell inner cavities are connected in series through bridge-crossing welding, and the battery shell is filled with electrolyte. The positive pole and the negative pole are respectively arranged at two ends of the battery. According to the lead-acid storage battery, the system reliability can be improved; the battery has the characteristics of high energy density, long service life and the like.

Description

Technical Field

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

[0002] Lead-acid batteries have been developed for more than 160 years and are widely used in energy storage and power fields. They are one of the most stable electrochemical energy storage technologies. Due to their low price, good safety, and mature recycling technology, lead-acid batteries are widely used in UPS power supply systems. However, traditional lead-acid batteries have low energy density, and consistency issues are prominent when multiple batteries are used in series and parallel. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a lead-acid battery for UPS and a manufacturing method thereof.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] On the one hand, the present invention provides a lead-acid battery for UPS, including a battery shell, wherein the battery shell includes 6 single-cell cavities, each of which is sequentially arranged with a positive electrode plate, a diaphragm, and a negative electrode plate, and is filled with an electrolyte, wherein the positive electrode plate and the negative electrode plate are respectively connected in parallel through a bus bar, and two adjacent single-cell cavities are connected in series through a cross-bridge welding, and a positive electrode column and a negative electrode column are respectively arranged at both ends of the battery.

[0006] Furthermore, the surface of the grid of the positive and negative plates is roughened, and the grid material is a lead-tin alloy, which is manufactured by continuous casting, continuous rolling and continuous punching.

[0007] Furthermore, the grid structure of the positive and negative plates is a criss-cross grid.

[0008] Furthermore, the grid spacing is 3mm-7mm, and the grid thickness is 0.5mm-2mm;

[0009] Furthermore, the density of sulfuric acid in the electrolyte is 1.20-1.25 g / cm 3 .

[0010] On the other hand, the present invention provides a method for preparing a lead-acid battery for UPS, comprising the following steps:

[0011] S1. Making positive and negative electrode grids: using lead-tin alloy, the lead strip is roughened and then punched into positive and negative electrode grids;

[0012] S2, vacuum and lead paste making: add the lead paste raw materials in the vacuum paste machine in sequence, dry mix for 4min to 6min, add 5% to 20% deionized water by mass, wet mix for 5min to 10min, add sulfuric acid and stir under the condition of vacuum degree of 50mba to 200mba, and acid mix for 15min to 20min;

[0013] S3, grid drying: the lead paste prepared in step S2 is coated on the grid prepared in step S1, and the grid is collected after rolling and rapid drying, and sent to a curing room for curing and drying, and the finished plate is obtained after drying;

[0014] S4. Assembling semi-finished batteries: Arrange the positive plate, separator, and negative plate in order, use lead alloy to cast and weld the positive and negative plates to form 6 electrode groups, install the electrode groups in series into the inner cavity of a single cell, use bridge welding to connect the plates of two adjacent single cells, and seal the shell cover and terminals to form a semi-finished battery;

[0015] S5. Vacuum acid injection: Inject 500mL to 2500mL of dilute sulfuric acid into each cell under vacuum. The density of the sulfuric acid is 1.20g / cm 3 ~1.25g / cm 3 , the battery preparation is completed through internalization.

[0016] Furthermore, the components of the lead paste raw material in step S2 are as follows:

[0017] Positive electrode components:

[0018]

[0019] The rest is lead powder;

[0020] Negative electrode components:

[0021]

[0022]

[0023] The rest is lead powder.

[0024] Furthermore, the density of the dilute sulfuric acid is 1.400±0.002 g / cm 3 .

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention connects adjacent single-cell inner cavities in series through a cross-bridge welding structure, thereby increasing the battery capacity;

[0027] 2. The present invention designs the positive and negative electrode grids into a mesh structure, which can increase the reaction area inside the battery and improve the performance of the battery by increasing the energy density;

[0028] 3. The lead paste is prepared under vacuum, and the quality of the prepared lead paste is improved, thereby improving the consistency of the battery and extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] In the figure: 1. Battery shell; 2. Positive electrode; 3. Single cell inner cavity; 4. Bridge weld; 5. Negative electrode. DETAILED DESCRIPTION

[0031] The technical scheme of the present invention is described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments. The experimental methods and detection methods described in the embodiments are conventional methods unless otherwise specified. The reagents and materials, unless otherwise specified, can be purchased on the market.

[0032] Embodiment 1:

[0033] A lead-acid storage battery for UPS of the present embodiment comprises a battery housing 1, wherein the battery housing 1 comprises 6 single-cell inner cavities 3, wherein a positive electrode plate, a diaphragm, and a negative electrode plate are sequentially arranged in each single-cell inner cavity 3 and filled with an electrolyte, wherein the positive electrode plate and the negative electrode plate are respectively connected in parallel via a bus bar, and two adjacent single-cell inner cavities 3 are connected in series via a cross-bridge welding 4, and a positive electrode column 2 and a negative electrode column 5 are respectively arranged at both ends of the battery.

[0034] The surface of the grid of the positive and negative plates is roughened, the grid material is lead-tin alloy, and is made by continuous casting, rolling and punching.

[0035] The grid structure of the positive and negative plates is a crisscross grid.

[0036] The grid spacing is 5 mm, the positive grid thickness is 1 mm, and the negative grid thickness is 0.7 mm;

[0037] The density of sulfuric acid in the electrolyte is 1.25 g / cm 3 .

[0038] The preparation method comprises the following steps:

[0039] S1. Making positive and negative electrode grids: using lead-tin alloy, the lead strip is roughened and then punched into positive and negative electrode grids;

[0040] S2, vacuum and lead paste making: add the lead paste raw materials in the vacuum and paste machine in sequence, dry mix for 6 minutes, add 10% by mass of deionized water, wet mix for 10 minutes, add sulfuric acid under the condition of vacuum degree of 200mba and stir, and acid mix for 20 minutes;

[0041] S3, grid drying: the lead paste prepared in step S2 is coated on the grid prepared in step S1, and the grid is collected after rolling and rapid drying, and sent to a curing room for curing and drying, and the finished plate is obtained after drying;

[0042] S4, assembling semi-finished batteries: arranging the positive plate, the separator, and the negative plate in the order of 6:7, using lead alloy to cast and weld the positive and negative plates to form 6 electrode groups, and installing the electrode groups in series into the inner cavity 3 of the single cell, using the bridge welding 4 to connect the electrode plates of two adjacent single cells, and sealing the shell cover and the terminal to form a semi-finished battery;

[0043] S5. Vacuum acid injection: 1000 mL of dilute sulfuric acid is injected into each single cell inner cavity 3 under vacuum. The density of the sulfuric acid is 1.25 g / cm 3 , a 12V 100Ah battery is prepared by internalizing the battery.

[0044] The components of the lead paste raw material in step S2 are as follows:

[0045] Positive electrode components:

[0046]

[0047]

[0048] The rest is lead powder;

[0049] Negative electrode components:

[0050]

[0051] The rest is lead powder.

[0052] The density of the dilute sulfuric acid is 1.400±0.002 g / cm 3 .

[0053] Embodiment 2:

[0054] A lead-acid storage battery for UPS of the present embodiment comprises a battery housing 1, wherein the battery housing 1 comprises 6 single-cell inner cavities 3, wherein a positive electrode plate, a diaphragm, and a negative electrode plate are sequentially arranged in each single-cell inner cavity 3 and filled with an electrolyte, wherein the positive electrode plate and the negative electrode plate are respectively connected in parallel via a bus bar, and two adjacent single-cell inner cavities 3 are connected in series via a cross-bridge welding 4, and a positive electrode column 2 and a negative electrode column 5 are respectively arranged at both ends of the battery.

[0055] The surface of the grid of the positive and negative plates is roughened, the grid material is lead-tin alloy, and is made by continuous casting, rolling and punching.

[0056] The grid structure of the positive and negative plates is a crisscross grid.

[0057] The grid spacing is 5 mm, the positive grid thickness is 1 mm, and the negative grid thickness is 7 mm;

[0058] The density of sulfuric acid in the electrolyte is 1.25 g / cm 3 .

[0059] The preparation method comprises the following steps:

[0060] S1. Making positive and negative electrode grids: using lead-tin alloy, the lead strip is roughened and then punched into positive and negative electrode grids;

[0061] S2, vacuum and lead paste making: add the lead paste raw materials in the vacuum and paste machine in sequence, dry mix for 6 minutes, add 10% by mass of deionized water, wet mix for 10 minutes, add sulfuric acid under the condition of vacuum degree of 200mba and stir, and acid mix for 20 minutes;

[0062] S3, grid drying: the lead paste prepared in step S2 is coated on the grid prepared in step S1, and the grid is collected after rolling and rapid drying, and sent to a curing room for curing and drying, and the finished plate is obtained after drying;

[0063] S4, assembling semi-finished batteries: arranging the positive plate, the separator, and the negative plate in the order of 9:10, using lead alloy to cast and weld the positive and negative plates to form 6 electrode groups, and installing the electrode groups in series into the inner cavity 3 of the single cell, using the bridge welding 4 to connect the electrode plates of two adjacent single cells, and sealing the shell cover and the terminal to form a semi-finished battery;

[0064] S5. Vacuum acid injection: 1500 mL of dilute sulfuric acid is injected into each single cell inner cavity 3 under vacuum. The density of the sulfuric acid is 1.25 g / cm 3 , the 12V150Ah battery was prepared through internalization.

[0065] The components of the lead paste raw material in step S2 are as follows:

[0066] Positive electrode components:

[0067]

[0068] The rest is lead powder;

[0069] Negative electrode components:

[0070]

[0071]

[0072] The rest is lead powder.

[0073] The density of the dilute sulfuric acid is 1.400±0.002 g / cm 3 .

[0074] Embodiment 3:

[0075] A lead-acid storage battery for UPS of the present embodiment comprises a battery housing 1, wherein the battery housing 1 comprises 6 single-cell inner cavities 3, wherein a positive electrode plate, a diaphragm, and a negative electrode plate are sequentially arranged in each single-cell inner cavity 3 and filled with an electrolyte, wherein the positive electrode plate and the negative electrode plate are respectively connected in parallel via a bus bar, and two adjacent single-cell inner cavities 3 are connected in series via a cross-bridge welding 4, and a positive electrode column 2 and a negative electrode column 5 are respectively arranged at both ends of the battery.

[0076] The surface of the grid of the positive and negative plates is roughened, the grid material is lead-tin alloy, and is made by continuous casting, rolling and punching.

[0077] The grid structure of the positive and negative plates is a crisscross grid.

[0078] The grid spacing is 5 mm, the positive grid thickness is 1 mm, and the negative grid thickness is 7 mm;

[0079] The density of sulfuric acid in the electrolyte is 1.25 g / cm 3 .

[0080] The preparation method comprises the following steps:

[0081] S1. Making positive and negative electrode grids: using lead-tin alloy, the lead strip is roughened and then punched into positive and negative electrode grids;

[0082] S2, vacuum and lead paste making: add the lead paste raw materials in the vacuum and paste machine in sequence, dry mix for 6 minutes, add 10% by mass of deionized water, wet mix for 10 minutes, add sulfuric acid under the condition of vacuum degree of 200mba and stir, and acid mix for 20 minutes;

[0083] S3, grid drying: the lead paste prepared in step S2 is coated on the grid prepared in step S1, and the grid is collected after rolling and rapid drying, and sent to a curing room for curing and drying, and the finished plate is obtained after drying;

[0084] S4, assembling semi-finished batteries: arranging the positive plate, the separator, and the negative plate in the order of 12:13, using lead alloy to cast and weld the positive and negative plates to form 6 electrode groups, and installing the electrode groups in series into the inner cavity 3 of the single cell, using the bridge welding 4 to connect the electrode plates of two adjacent single cells, and sealing the shell cover and the terminal to form a semi-finished battery;

[0085] S5. Vacuum acid injection: 2500 mL of dilute sulfuric acid is injected into each single cell inner cavity 3 under vacuum. The density of the sulfuric acid is 1.25 g / cm 3 , the 12V200Ah battery was prepared through internalization.

[0086] The components of the lead paste raw material in step S2 are as follows:

[0087] Positive electrode components:

[0088]

[0089] The rest is lead powder;

[0090] Negative electrode components:

[0091]

[0092] The rest is lead powder.

[0093] The density of the dilute sulfuric acid is 1.400±0.002 g / cm 3 .

[0094] Comparative Example:

[0095] Energy density is an evaluation index of battery performance, which is used to compare the amount of energy that a battery can store per unit volume or unit mass, and the commonly used unit is watt-hour / kilogram (Wh / Kg). Improving energy density is conducive to reducing the use of lead, reducing battery manufacturing costs, and improving product technology levels.

[0096] The present invention prepares lead-acid batteries for UPS through Examples 1-3 respectively. The preparation process comparison is shown in Table 1, and the performance comparison results with traditional batteries are shown in Table 2.

[0097] Table 1 Comparison of battery processes prepared in Examples 1-3

[0098]

[0099] Table 2 Comparison of energy density between the UPS lead-acid battery of the present invention and ordinary batteries

[0100] Battery Type Energy density (Wh / Kg) 12V100Ah (ordinary battery) 38.7 12V100Ah (Example 1) 50.8 12V150Ah (Example 2) 50.5 12V200Ah (Example 3) 51.3

[0101] The embodiments of the present invention are only to introduce the specific implementation methods thereof, and are not intended to limit the protection scope thereof. The technicians in the industry may make some modifications inspired by the embodiments, so any equivalent changes or modifications made according to the scope of the present invention are within the scope of the patent claims of the present invention.

Claims

1. A lead-acid battery for UPS, characterized in that: The battery case (1) comprises 6 single-cell inner cavities (3), each of which is filled with electrolyte, wherein a positive electrode plate, a separator and a negative electrode plate are arranged in sequence, and the positive electrode plate and the negative electrode plate are connected in parallel via a bus bar, and two adjacent single-cell inner cavities (3) are connected in series via a cross-bridge weld (4), and a positive electrode column (2) and a negative electrode column (5) are respectively arranged at both ends of the battery.

2. A lead-acid battery for UPS according to claim 1, characterized in that: The surface of the grid of the positive and negative plates is roughened, the grid material is lead-tin alloy, and is made by continuous casting, rolling and punching.

3. A lead-acid battery for UPS according to claim 1, characterized in that: The grid structure of the positive and negative plates is a crisscross grid.

4. A lead-acid battery for UPS according to claim 3, characterized in that: The grid spacing is 3mm-7mm, and the grid thickness is 0.5mm-2mm.

5. A lead-acid battery for UPS according to claim 1, characterized in that: The density of sulfuric acid in the electrolyte is 1.20-1.25 g / cm 3 .

6. A method for preparing a lead-acid battery for UPS according to claim 1, characterized in that: The following steps are involved: S1. Making positive and negative electrode grids: using lead-tin alloy, the lead strip is roughened and then punched into positive and negative electrode grids; S2, vacuum and lead paste making: add the lead paste raw materials in the vacuum paste machine in sequence, dry mix for 4min to 6min, add 5% to 20% deionized water by mass, wet mix for 5min to 10min, add sulfuric acid and stir under the condition of vacuum degree of 50mba to 200mba, and acid mix for 15min to 20min; S3, grid drying: the lead paste prepared in step S2 is coated on the grid prepared in step S1, and the grid is collected after rolling and rapid drying, and sent to a curing room for curing and drying, and the finished plate is obtained after drying; S4, assembling semi-finished battery: arranging the positive plate, separator and negative plate in the order, using lead alloy to cast and weld the positive and negative plates to form 6 electrode groups, installing the electrode groups in series into the inner cavity of a single cell (3), connecting the electrode plates of two adjacent single cells by cross-bridge welding (4), and sealing the shell cover and terminals to form a semi-finished battery; S5. Vacuum acid injection: 500 mL to 2500 mL of dilute sulfuric acid is injected into each single cell inner cavity (3) under vacuum. The density of the sulfuric acid is 1.20 g / cm 3 ~1.25g / cm 3 , the battery preparation is completed through internalization.

7. A method for preparing a lead-acid battery for UPS according to claim 1, characterized in that: The components of the lead paste raw material in step S2 are as follows: Positive electrode components: The rest is lead powder; Negative electrode components: The rest is lead powder.

8. A method for preparing a lead-acid battery for UPS according to claim 1, characterized in that: The density of the dilute sulfuric acid is 1.400±0.002 g / cm 3 .

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