External acid injection type lead-acid storage battery and finished product preparation process

Abstract

The application discloses an external acid injection type lead-acid storage battery and a finished product preparation process, and belongs to the technical field of lead-acid storage battery production. The battery body is internally provided with a plurality of unit cells, the unit cells are connected through welding to form a pole group, a through hole corresponding to the unit cell is formed in the bottom of one side of the battery body, each through hole is provided with an acid injection groove in communication, and the acid injection groove is fixedly arranged on one side of the battery body shell. The acid injection and formation processes can be completed under negative pressure, the formation period is shortened, the uniformity of electrolyte on each unit cell can be ensured during acid injection, the consistency of the battery is improved, the service life of the battery is prolonged, the acid mist generated during formation is prevented from causing environmental pollution and safety problems, the heat generation is reduced without using other heat dissipation modes, the formation time of the battery is shortened, and the production efficiency of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lead-acid battery production, and particularly relates to an external acid injection type lead-acid battery and a finished product preparation process. BACKGROUND

[0002] Lead-acid batteries are divided into exhaust type batteries and maintenance-free lead-acid batteries, and the valve-regulated lead-acid battery is one of the maintenance-free lead-acid batteries. The valve-regulated lead-acid battery has a wide range of applications in the energy, transportation, and machinery industries due to its high safety, high cost performance, and convenient use. However, the production and manufacturing process of the valve-regulated lead-acid battery is relatively complex and has a long cycle, generally requiring 20-30 days. In particular, the internal formation process takes even longer, usually 5-7 days. The length of the internal formation process depends on the electrolyte injection method and the control of the injection temperature. The traditional valve-regulated lead-acid battery uses an integrated acid injection pot to directly pour from the top. This method is prone to electrolyte overflow, causing unnecessary economic losses and even safety accidents.

[0003] Currently, the valve-regulated lead-acid battery uses a separate acid injection pot to add acid from the top through negative pressure quantification to solve the problem of electrolyte overflow. This method involves adding electrolyte to the battery at one time, and after the formation is completed, the excess electrolyte inside the battery needs to be removed. This operation process is relatively complex, and the battery will lose a large amount of water during the formation process. Water loss will increase the density of the electrolyte inside the battery. Since the valve-regulated lead-acid battery uses a tightly assembled AGM separator, the electrolyte has poor flowability without external force, resulting in a large difference in electrolyte density between the upper and lower parts of the battery, which affects the consistency of the valve-regulated lead-acid battery and shortens its service life.

[0004] The present stage has adopted the injection method of injecting glue at the bottom and returning glue at the top of the valve-controlled lead-acid storage battery, such as Chinese Patent No. CN106299235A, published on January 4, 2017, which discloses a lead-acid battery glue injection device and glue injection method. The document proposes "including: glue storage warehouse, glue pump connected with the glue storage warehouse, glue collection tank; the lead-acid battery glue injection device further includes a plurality of glue injection assemblies, a plurality of quantitative glue storage assemblies corresponding to the number of glue injection assemblies; the glue injection assembly includes: a lead-acid battery provided with a glue injection inlet at the lower end or / and the lower part of the side wall, a glue return outlet at the upper end, a glue return pipe with one end detachably connected with the glue return outlet and the other end connected with the glue collection tank, a glue injection tank located above the lead-acid battery and provided with a positive and negative pressure ventilation reversing valve, a glue injection on-off valve arranged at the lower end of the glue injection tank, and a glue injection pipe with one end connected with the glue injection on-off valve outlet and the other end detachably connected with the glue injection inlet." This prior art adds electrolyte to the inside of the lead-acid battery through the glue injection inlet at the lower end or / and the lower part of the side wall, and then extracts the electrolyte through the glue return outlet at the upper end, which can reduce the difference in electrolyte density. However, since there are multiple unit cells inside the battery, this prior art cannot guarantee the uniformity of the electrolyte in each unit cell, which cannot effectively improve the consistency of the battery, resulting in a short service life of the battery. In addition, this prior art is prone to produce acid mist during the formation process, causing environmental pollution. Moreover, due to the large amount of heat generated by electrochemical reaction, internal resistance, etc., water bath or reducing the formation speed or prolonging the formation time is needed to assist in reducing the heat generation, which prolongs the time of the formation process, thereby reducing the production efficiency of the valve-controlled lead-acid storage battery. Therefore, a new technical solution is needed to solve the above technical problems. SUMMARY

[0005] The present application aims to provide an external acid injection type lead-acid storage battery and a finished product preparation process to solve the problems of the above background technology, such as the current acid injection or glue injection equipment of the valve-controlled lead-acid storage battery, which cannot guarantee the uniformity of the electrolyte in each unit cell inside the battery, the consistency of the battery is not high, the service life of the battery is not long, and acid mist is easily produced during the formation process, causing environmental pollution. In addition, water bath or reducing the formation speed or prolonging the formation time is needed to assist in reducing the heat generation, which prolongs the time of the formation process, thereby reducing the production efficiency of the valve-controlled lead-acid storage battery.

[0006] In order to achieve the above object, the application provides the following technical scheme: an external acid injection type lead-acid storage battery, comprising a battery body, the inside of the battery body is provided with a plurality of unit cells, the plurality of unit cells are connected by welding to form a pole group, the top of the battery body is connected with a formation device through a connecting wire at both ends, characterized in that a through hole corresponding to the unit cell is formed in the bottom of one side of the battery body, one acid injection groove is arranged in each through hole, the acid injection groove is fixedly arranged on one side of the battery body shell, a plurality of valve holes are formed in the middle of the top of the battery body, one negative pressure pipe is inserted and connected in each valve hole, the lower part of each negative pressure pipe penetrates the valve hole and extends to the inside of the battery body and is arranged away from the pole group.

[0007] Further, the unit cell is arranged in communication with the acid injection groove through the through hole, the acid injection groove is arranged one-to-one corresponding to the unit cell, the through hole and the acid injection groove are arranged on the same side of the battery body, the through hole is arranged in communication at the bottom of the acid injection groove, the acid injection groove is arranged in a flat hollow structure, an acid injection nozzle is fixedly arranged at the top of the acid injection groove, a cap or an acid injection pipe is inserted and connected to the acid injection nozzle.

[0008] Further, the cap is inserted and connected to a plurality of acid injection nozzles, the cap is arranged in a cuboid structure, a sleeve hole matched with the plurality of acid injection nozzles is formed in the lower part of the cuboid cap.

[0009] Further, the acid injection pipe is inserted and connected to a single acid injection nozzle, a sleeve nozzle is arranged at the lower part of the acid injection pipe, the sleeve nozzle is inserted and connected to the acid injection nozzle, the acid injection nozzle and the sleeve nozzle are arranged one-to-one, a connecting pipe is arranged at the upper part of the acid injection pipe, the lower part of the connecting pipe is inclinedly and arcuately connected to the sleeve nozzle, a dilute sulfuric acid tank or a gel electrolyte tank is connected to the upper part of the connecting pipe.

[0010] Further, a thin pipe is arranged at the lower part of the negative pressure pipe, a negative pressure connecting pipe is arranged at the upper part of the negative pressure pipe, the lower part of the negative pressure connecting pipe is inclinedly and arcuately connected to the thin pipe through an adapter, a negative pressure tank is connected to the upper part of the negative pressure connecting pipe.

[0011] Further, the thin pipe penetrates the valve hole and extends to the inside of the battery body and is arranged away from the pole group, the distance between the top of the pole group and the bottom of the thin pipe is 0-2mm.

[0012] According to the above arrangement, the finished product battery is produced, and the specific preparation steps of the finished product battery are as follows:

[0013] S1, install the acid injection equipment: insert the acid injection tube into the battery body through the acid injection nozzle, connect the acid injection tube with the dilute sulfuric acid tank, insert the negative pressure tube with a thin tube into the top of the battery body through the valve hole, connect the negative pressure tube with the negative pressure tank, and then connect the two ends of the battery body with the positive and negative electrodes of the formation equipment through the connecting wires to complete the installation of the acid injection equipment;

[0014] S2, negative pressure acid injection: in the acid injection equipment installed in S1, first open the dilute sulfuric acid tank, add the dilute sulfuric acid with a density of 1.2 g / ml in the dilute sulfuric acid tank into the acid injection tank through the acid injection tube, at this time the temperature of the dilute sulfuric acid is-5-15℃, then open the negative pressure tank, under the action of negative pressure-0.12-0 MPa, the dilute sulfuric acid with a density of 1.2 g / ml in the acid injection tank enters the inside of the battery body through the through hole, until the dilute sulfuric acid with a density of 1.2 g / ml displaces the air in the inside of the electrode group, the negative pressure acid injection is completed, and then the battery body is continuously subjected to negative pressure acid injection, the overflowed dilute sulfuric acid is sucked out by the negative pressure tube through the thin tube, at this time the temperature of the dilute sulfuric acid is less than 45℃, and acid circulation is realized;

[0015] S3, formation: under the circulation of the acid in S2, open the formation equipment, the formation equipment charges and discharges the battery body in multiple stages through the connecting wires to complete the formation of the battery body;

[0016] S4, negative pressure glue injection: after the completion of the formation in S3, close the dilute sulfuric acid tank, stop the addition of the dilute sulfuric acid with a density of 1.2 g / ml, disconnect the acid injection tube from the dilute sulfuric acid tank, connect the acid injection tube with the gel electrolyte tank, then open the gel electrolyte tank, add the gel electrolyte in the gel electrolyte tank with a density of 1.35 g / ml±0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25±10℃ into the acid injection tank through the acid injection tube, under the action of negative pressure-0.07--0.1 MPa, the gel electrolyte with a density of 1.35 g / ml±0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25±10℃ in the acid injection tank enters the inside of the battery body through the through hole, until the gel electrolyte with a density of 1.35 g / ml±0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25±10℃ displaces the dilute sulfuric acid in the inside of the battery body, close the gel electrolyte tank, stop the injection of the gel electrolyte, and keep the negative pressure for 5-10 min, the excess gel electrolyte is sucked out by the negative pressure tube through the thin tube, the saturation degree of the gel electrolyte in the AGM separator of the battery body is 95-98%, and the negative pressure glue injection is completed;

[0017] S5, remove the acid injection equipment: after S4 negative pressure injection glue is completed, first, the acid injection pipe and negative pressure pipe are disconnected with the gel electrolyte tank and negative pressure tank respectively, then the acid injection pipe and the negative pressure pipe with a thin tube are pulled out from the acid injection nozzle and the valve hole, the cap is inserted on the acid injection nozzle of the acid injection pipe, the sealing cover is covered on the valve hole of the negative pressure pipe with a thin tube, at the same time, the connecting line is removed from both ends of the battery body, finally, the appearance of the battery body is cleaned to obtain the finished product battery.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1. The acid injection groove is arranged on the outer side of the battery, so that the battery body can complete the acid injection and formation processes under negative pressure, thereby greatly shortening the formation period of the battery body, the acid injection groove is communicated with the unit cell, so that the uniformity of the dilute sulfuric acid or gel electrolyte on each unit cell can be ensured during acid injection, the consistency of the valve-regulated lead-acid battery is effectively improved, the service life of the battery body is greatly prolonged, the acid mist caused by formation is effectively avoided by using the negative pressure effect, the dilute sulfuric acid and gel electrolyte can be effectively extracted by the negative pressure pipe, so that the dilute sulfuric acid and gel electrolyte can circulate and flow in the battery body to achieve heat dissipation, the heat generation can be reduced without using other heat dissipation methods, the battery formation time is greatly shortened, and the production efficiency of the battery body is ensured.

[0020] 2. The acid injection groove with a flat hollow structure is arranged on the battery body without changing the original structure, so that the battery body can not only meet the acid injection requirements, but also complete the acid injection and formation processes under negative pressure, thereby greatly shortening the formation period of the battery body, the acid injection nozzle is inserted and pulled out with the cap or the acid injection pipe, so that the acid injection of the battery body is more convenient and efficient, the efficiency of the acid injection of the battery body is effectively improved, the acid injection groove, the unit cell and the through hole are correspondingly arranged, so that the uniformity of the dilute sulfuric acid or gel electrolyte on each unit cell can be ensured during acid injection, the consistency of the valve-regulated lead-acid battery is effectively improved, and the service life of the battery body is greatly prolonged.

[0021] 3. The top of the pole group is arranged apart from the bottom of the thin tube, so that the dilute sulfuric acid and gel electrolyte can be effectively extracted by the negative pressure pipe, so that the dilute sulfuric acid and gel electrolyte can circulate and flow in the battery body to achieve heat dissipation, the heat generation can be reduced without using other heat dissipation methods, the battery formation time is greatly shortened, and the production efficiency of the battery body is ensured.

[0022] 4. The application adopts low-density dilute sulfuric acid for formation, so that the formation conversion efficiency of the battery body is effectively improved, the formation effect is effectively improved, the electric resources are effectively saved, the negative pressure of the negative pressure tank is used, manual acid extraction is not needed, the labor intensity is effectively reduced, the acid extraction efficiency is improved, the acid mist generated in the formation is kept in the battery body, environmental pollution and safety accidents are effectively avoided, and the safety of the prepared finished battery is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole structure schematic diagram of the application;

[0024] Figure 2 It is a whole positive cross-section structure schematic diagram of the application;

[0025] Figure 3 It is a whole side cross-section structure schematic diagram of the application;

[0026] Figure 4 It is a structure schematic diagram of the acid injection pipe of the application;

[0027] Figure 5 It is a structure schematic diagram of the cap of the application;

[0028] Figure 6 It is a structure schematic diagram of the negative pressure pipe of the application;

[0029] Figure 7 It is a structure schematic diagram of the finished battery of the application (the cap is omitted).

[0030] Wherein: 1, battery body; 101, unit cell; 1011, pole group; 2, connecting wire; 3, through hole; 4, acid injection groove; 5, valve hole; 6, sealing cover; 7, negative pressure pipe; 8, acid injection nozzle; 9, cap; 10, acid injection pipe; 11, sleeve hole; 12, sleeve nozzle; 13, connecting pipe; 14, thin pipe; 15, negative pressure connecting pipe; 16, adapter. DETAILED DESCRIPTION

[0031] The following examples are used to further illustrate the content of the application, and do not limit the application of the application.

[0032] Please refer to Figures 1-7The utility model provides an external acid injection type lead-acid battery, which comprises a battery body 1, a plurality of unit cells 101 are arranged in the battery body 1, the plurality of unit cells 101 are connected through welding to form a pole group 1011, the top of the battery body 1 is connected with a formation equipment (the functions and structures of the formation equipment and other conventional equipment are well known in the art, and the connection setting is also well known, so no further description is made here, and the formation equipment is not shown in the drawings) for formation through connecting wires 2, a plurality of through holes 3 for connecting the unit cells 101 with acid injection grooves 4 are formed in the bottom of one side of the battery body 1, the through holes 3 are arranged one by one corresponding to the unit cells 101, each of the through holes 3 is connected with an acid injection groove 4 for acid injection, the acid injection groove 4 is fixedly arranged on one side of the shell of the battery body 1, a plurality of valve holes 5 are formed in the middle of the top of the battery body 1, each of the valve holes 5 is connected with a negative pressure pipe 7 for negative pressure acid extraction through plug-in connection, the lower part of each of the negative pressure pipes 7 penetrates the valve hole 5 and extends to the inside of the battery body 1 and is arranged away from the pole group 1011.

[0033] Please refer to Figures 1-5 The unit cells 101 are arranged in the through holes 3 and connected with the acid injection grooves 4, the acid injection grooves 4 are arranged one by one corresponding to the unit cells 101, the through holes 3 and the acid injection grooves 4 are arranged on the same side of the battery body 1, the through holes 3 are arranged in the bottom of the acid injection grooves 4, the acid injection grooves 4 are arranged in a flat hollow structure, the top of the acid injection groove 4 of the flat hollow structure is fixedly provided with an acid injection nozzle 8 for matching connection with an acid injection equipment, the acid injection nozzle 8 is plug-in connected with a cap 9 for sealing the acid injection nozzle 8 or an acid injection pipe 10 for connecting the acid injection equipment;

[0034] The cap 9 is plug-in connected with a plurality of acid injection nozzles 8, the cap 9 is arranged in a cuboid structure, the lower part of the cuboid cap 9 is provided with a sleeve hole 11 for sleeving a plurality of acid injection nozzles 8, and the sleeve hole 11 is plug-in connected with the plurality of acid injection nozzles 8 in a sleeving mode;

[0035] The acid injection pipe 10 is plug-in connected with a single acid injection nozzle 8, the lower part of the acid injection pipe 10 is provided with a sleeve nozzle 12 for sleeving the single acid injection nozzle 8, the sleeve nozzle 12 is plug-in connected with the single acid injection nozzle 8 in a sleeving mode, the acid injection nozzle 8 and the sleeve nozzle 12 are arranged one by one, the upper part of the acid injection pipe 10 is provided with a connecting pipe 13 for connecting the acid injection equipment, the lower part of the connecting pipe 13 is obliquely and arcuately connected with the sleeve nozzle 12, and the upper part of the connecting pipe 13 is connected with a dilute sulfuric acid tank for supplying dilute sulfuric acid or a colloidal electrolyte tank for supplying colloidal electrolyte (the functions and structures of the dilute sulfuric acid tank or the colloidal electrolyte tank and other conventional equipment are well known in the art, and the connection setting is also well known, so no further description is made here, and the dilute sulfuric acid tank or the colloidal electrolyte tank is not shown in the drawings).

[0036] Please refer to Figures 1-3 and Figure 6The lower part of the negative pressure pipe 7 is provided with a thin pipe 14 for extracting air, dilute sulfuric acid and gel electrolyte inside the battery body 1, the thin pipe 14 penetrates the valve hole 5 and extends to the inside of the battery body 1 and is arranged at a distance from the pole group 1011, the top of the pole group 1011 is at a distance of 0-2mm from the bottom of the thin pipe 14, the upper part of the negative pressure pipe 7 is provided with a negative pressure connecting pipe 15 for connecting the vacuum extraction equipment, the lower part of the negative pressure connecting pipe 15 is connected to the thin pipe 14 in an inclined arc shape through an adapter 16, the upper part of the negative pressure connecting pipe 15 is connected with a negative pressure tank for vacuum extraction (the functions and structures of the negative pressure tank and other conventional equipment are well known in the art, and the connection setting is also common knowledge, so it is not described here, and it is not shown in the drawings).

[0037] After the external acid injection type lead-acid battery is assembled according to the above setting, the battery body 1 needs to be subjected to a formation process to complete the production of finished batteries. Specifically, the operator needs to insert the acid injection nozzle 8 on the acid injection groove 4 on the outside of the battery body 1 with the acid injection pipe 10, then connect the acid injection pipe 10 with the dilute sulfuric acid tank, so that the dilute sulfuric acid in the dilute sulfuric acid tank can enter the cell 101 through the acid injection pipe 10, the acid injection nozzle 8, the acid injection groove 4 and the through hole 3 in turn, at the same time, the valve hole 5 at the top of the battery body 1 is inserted with the negative pressure pipe 7 with the thin pipe 14, then the negative pressure pipe 7 is connected with the negative pressure tank, so that the negative pressure tank can extract air, dilute sulfuric acid and gel electrolyte through the negative pressure pipe 7 and the thin pipe 14 in turn, then the two ends of the battery body 1 are connected with the positive and negative electrodes of the formation equipment through the connecting wires 2, the installation of the acid injection equipment is completed, and the acid injection operation can be performed.

[0038] When the acid injection operation is needed, the dilute sulfuric acid tank is first opened, and the dilute sulfuric acid with a density of 1.2g / ml in the dilute sulfuric acid tank is added to the acid injection groove 4 through the acid injection pipe 10. Since the main components of the active material before formation of the battery body 1 are lead sulfate and lead oxide, a large amount of heat will be released when lead oxide reacts with dilute sulfuric acid, resulting in an increase in the temperature of the battery body 1 and the dilute sulfuric acid. In order to control the temperature of the battery body 1, the temperature of the dilute sulfuric acid is controlled between -5-15℃ at the initial stage of acid injection, then the negative pressure tank is opened, and vacuum negative pressure is started, so that the pressure of the negative pressure is controlled between -0.12-0MPa, thereby ensuring that the temperature of the extracted dilute sulfuric acid is less than 45℃. At the same time, under the action of the negative pressure, the dilute sulfuric acid with a density of 1.2g / ml in the acid injection groove 4 enters the inside of the battery body 1 through the through hole 3 and flows uniformly into the inside of the pole group 1011, until the dilute sulfuric acid with a density of 1.2g / ml replaces the air inside the pole group 1011, and the negative pressure acid injection is completed. Then the battery body 1 is continuously subjected to negative pressure acid injection, and the overflowed dilute sulfuric acid is extracted by the negative pressure pipe 7 through the thin pipe 14, so that the acid circulation lasts for 0.5-1h, and the formation operation can be performed.

[0039] When the formation operation is needed, the formation device is turned on, and the battery body 1 is charged and discharged in nine stages by the connection line 2. The specific charging and discharging is as follows: the first stage uses 0.1C (C is the rated capacity of the battery) current to charge the battery body 1 for 1h, and then goes to the second stage, the second stage uses 0.5C current to charge the battery for 8h, and then goes to the third stage, the third stage uses 1C current to discharge the battery for 0.5h, and then goes to the fourth stage, the fourth stage uses 0.5C current to charge the battery body 1 for 4h, and then goes to the fifth stage, the fifth stage uses 0.25C current to charge the battery body 1 for 4h, and then goes to the sixth stage, the sixth stage uses 1C current to discharge the battery body 1, and stops discharging when the battery body 1 drops to 1.75V / single cell voltage, and records the discharge time, calculates the capacity of the battery body 1, and then goes to the seventh stage, the seventh stage uses 0.5C current to charge the battery body 1 for 2h, and then goes to the eighth stage, the eighth stage uses 0.2C current to charge the battery body 1 for 2h, and then goes to the ninth stage, the ninth stage completes the formation process of the battery body 1. In the formation, the temperature of the dilute sulfuric acid drawn out of the negative pressure pipe 7 needs to be controlled at 35-40℃, and the circulation speed of the dilute acid liquid is adjusted by controlling the pressure of the negative pressure. If the temperature is too high, the vacuum degree is increased to speed up the circulation flow rate of the dilute sulfuric acid. If the temperature is too low, the vacuum degree is reduced to reduce the circulation flow rate of the dilute sulfuric acid. After the formation of the battery body 1 is completed, the formation device is disconnected from the connection line 2, and the glue injection operation can be performed.

[0040] When the injection of gel is needed, the dilute sulfuric acid tank is closed, the addition of dilute sulfuric acid with a density of 1.2 g / ml is stopped, the injection pipe 10 is disconnected from the dilute sulfuric acid tank, the injection pipe 10 is connected to the gel electrolyte tank, the vacuum pressure of -0.12 MPa is continued to be applied to the battery body 1 for 3 min, then the gel electrolyte tank is opened, the gel electrolyte in the gel electrolyte tank with a density of 1.35 g / ml ± 0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25 ± 10°C is injected into the injection tank 4 through the injection pipe 10, the negative pressure is adjusted to -0.07 to -0.1 MPa, then the gel electrolyte in the injection tank 4 with a density of 1.35 g / ml ± 0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25 ± 10°C is introduced into the battery body 1 through the through hole 3, until the gel electrolyte with a density of 1.35 g / ml ± 0.005 g / ml, a gel content of 0.5-0.6%, and a temperature of 25 ± 10°C is replaced in the battery body 1 (i.e. the density of the gel electrolyte detected at the negative pressure pipe 7 is 1.35 g / ml ± 0.005 g / ml), the gel electrolyte tank is closed, the injection of the gel electrolyte is stopped, and the negative pressure of -0.07 to -0.1 MPa is maintained for 5-10 min, the excess gel electrolyte is drawn out by the negative pressure pipe 7 through the fine pipe 14, the saturation of the gel electrolyte in the AGM separator of the battery body 1 is controlled at 95-98%, the negative pressure injection of the gel is completed, and the injection equipment can be removed.

[0041] When the injection equipment is needed to be removed, the injection pipe 10 and the negative pressure pipe 7 are disconnected from the gel electrolyte tank and the negative pressure tank respectively, the injection pipe 10 and the negative pressure pipe 7 with the fine pipe 14 are pulled out from the injection nozzle 8 and the valve hole 5, the injection nozzle 8 of the injection pipe 10 is inserted with the cap 9, the valve hole 5 of the negative pressure pipe 7 with the fine pipe 14 is covered with the sealing cap 6, the connecting wire 2 is removed from both ends of the battery body 1, and finally the appearance of the battery body 1 is cleaned to obtain the final product battery.

Claims

1. An externally injected lead-acid battery, comprising a battery body, wherein a plurality of cells are arranged inside the battery body, and a plurality of cells are welded to form a pole group, characterized in that: A through hole corresponding to a cell is opened at the bottom of one side of the battery body, each of the through holes is connected to an acid injection groove, and the acid injection groove is fixedly arranged on a side of the battery body shell. A plurality of valve holes are opened in the middle position of the top of the battery body, and a negative pressure tube is plugged and connected in each valve hole. The lower part of each negative pressure tube passes through the valve hole and extends to the interior of the battery body and is set apart from the pole group; The specific preparation steps of the finished product are as follows: S1. Acid injection equipment installation: Insert the acid injection tube through the acid injection nozzle on the outside of the battery body, and then connect the acid injection tube to the dilute sulfuric acid tank. At the same time, insert the negative pressure tube with a thin tube through the valve hole on the top of the battery body, and then connect the negative pressure tube to the negative pressure tank. Then, connect the two ends of the battery body to the positive and negative electrodes of the formation equipment through connecting wires to complete the installation of the acid injection equipment. S2, negative pressure acid injection: In the acid injection equipment installed in S1, first open the dilute sulfuric acid tank, add the dilute sulfuric acid in the dilute sulfuric acid tank into the acid injection tank through the acid injection pipe, then open the negative pressure tank, and under the action of negative pressure, the dilute sulfuric acid in the acid injection tank enters the interior of the battery body through the through hole until the dilute sulfuric acid replaces the internal air of the pole group, completing the negative pressure acid injection, and then continue to negatively inject acid into the battery body. The overflowed dilute sulfuric acid is extracted by the negative pressure pipe through the capillary tube to realize acid circulation. The density of the dilute sulfuric acid is 1.2g / ml, the temperature at the initial stage of acid injection is -5~15℃, the pressure of the negative pressure is -0.12~0MPa, and the temperature of the dilute sulfuric acid extracted by negative pressure is less than 45℃; S3, formation: under the acid injection cycle in S2, the formation equipment is turned on. The formation equipment charges and discharges the battery body in multiple stages through the connecting wires to complete the formation of the battery body; S4, negative pressure injection: After the formation in S3 is completed, close the dilute sulfuric acid tank, stop adding dilute sulfuric acid, disconnect the acid injection tube from the dilute sulfuric acid tank, and then connect the acid injection tube to the colloidal electrolyte tank, and then open the colloidal electrolyte tank, and add the colloidal electrolyte in the colloidal electrolyte tank into the acid injection tank through the acid injection tube. Continue to inject the colloidal electrolyte in the acid injection tank into the interior of the battery body through the through hole under the action of negative pressure until the colloidal electrolyte replaces the dilute sulfuric acid inside the battery body, close the colloidal electrolyte tank, and stop Inject the colloidal electrolyte while maintaining negative pressure for 5 to 10 minutes, and draw out the excess colloidal electrolyte through the capillary tube by the negative pressure tube to complete the negative pressure injection. The density of the colloidal electrolyte is 1.35 g / ml ± 0.005 g / ml, the content of the colloidal electrolyte in the colloidal electrolyte is 0.5 to 0.6%, the temperature of the colloidal electrolyte is 25 ± 10 ° C, the negative pressure is -0.07 to -0.1 MPa, and the saturation of the colloidal electrolyte in the AGM separator of the battery body is 95 to 98%; S5. Dismantle the acid injection equipment: After the negative pressure injection in S4 is completed, first disconnect the acid injection tube and the negative pressure tube from the colloidal electrolyte tank and the negative pressure tank respectively, then pull out the acid injection tube and the negative pressure tube with a thin tube from the acid injection nozzle and the valve hole, insert the cap on the acid injection nozzle of the pulled-out acid injection tube, and cover the sealing cover on the valve hole of the pulled-out negative pressure tube with a thin tube. At the same time, remove the connecting wires from both ends of the battery body, and finally clean the appearance of the battery body to obtain the finished battery.

2. The externally-installed acid-injected lead-acid battery according to claim 1, characterized in that: The cells are connected to the acid injection tank via a through hole, the acid injection tank is arranged in a one-to-one correspondence with the cells, and the through hole and the acid injection tank are arranged on the same side of the battery body.

3. The externally-installed acid-injected lead-acid battery according to claim 2, characterized in that: The through hole is connected and arranged at the bottom of the acid injection tank. The acid injection tank is arranged in a flat hollow structure. An acid injection nozzle is fixedly arranged on the top of the acid injection tank. A cap or an acid injection tube is plugged and unplugged on the acid injection nozzle. The cap is plugged and unplugged into multiple acid injection nozzles at the same time, and the acid injection tube is plugged and unplugged into a single acid injection nozzle.

4. The externally-installed acid-injected lead-acid battery according to claim 3, characterized in that: The cap is arranged in a rectangular parallelepiped structure, and a sleeve hole matched with a plurality of acid injection nozzles is opened at the lower part of the rectangular parallelepiped cap.

5. The externally-installed acid-injected lead-acid battery according to claim 3, characterized in that: A sleeve nozzle is provided at the lower part of the acid injection pipe, and the sleeve nozzle is plug-in connected to the acid injection nozzle. The acid injection nozzle and the sleeve nozzle are arranged in a one-to-one correspondence. A connecting pipe is provided at the upper part of the acid injection pipe, and the lower part of the connecting pipe is connected to the sleeve nozzle in an inclined arc shape. The upper part of the connecting pipe is connected to a dilute sulfuric acid tank or a colloidal electrolyte tank.

6. The externally-installed acid-injected lead-acid battery according to claim 1, characterized in that: A thin tube is provided at the lower part of the negative pressure tube. The thin tube passes through the valve hole and extends to the interior of the battery body and is arranged at a distance from the pole group. The distance between the top of the pole group and the bottom of the thin tube is 0 to 2 mm.

7. The externally-placed acid-injected lead-acid battery according to claim 6, characterized in that: A negative pressure connecting pipe is provided on the upper portion of the negative pressure pipe, the lower portion of the negative pressure connecting pipe is connected to the thin tube in an inclined arc shape through an adapter, and the upper portion of the negative pressure connecting pipe is connected to a negative pressure tank.

8. The externally-installed acid-injected lead-acid battery according to claim 1, characterized in that: Both ends of the top of the battery body are connected to formation equipment via connecting wires.

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