Intermittent rapid energy complementing method for tubular power battery

Abstract

The invention belongs to the technical field of battery charging, and particularly relates to a tubular power battery intermittent rapid energy supplementing method. According to the intermittent rapid energy supplementing method for the tubular power batteries, the tubular power batteries are connected in series through a connecting wire, the two ends of each tubular power battery are connected with an intelligent charger through a positive electrode outgoing line and a negative electrode outgoing line, an air pipe in a battery box is connected with an external air circulation pipeline, and then the air circulation pipeline is connected with an air circulation pump. And meanwhile, the intelligent charger and the air circulating pump are started to carry out current charging, and compressed air is blown into the battery box through the air circulating pump to open the battery upper cover so as to exhaust the air. According to the intermittent rapid energy complementing method for the tubular power battery, the charging efficiency is high, the service life of the battery is prolonged, and the performance of the battery is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of battery charging, and in particular relates to an intermittent rapid energy replenishment method for a tubular power battery. Background Art

[0002] At present, with the rapid development of e-commerce and logistics industries, forklifts and other transport vehicles have been rapidly popularized. Transport vehicles with lead-acid batteries as the main power have occupied most of the market share due to their high safety and high cost-effectiveness. Forklifts and other transport vehicles are generally designed for 8 hours of working time. Due to the high intensity of continuous operation in some warehousing industries, it is difficult to meet the needs of one day's work. The conventional charging time is between 10 and 12 hours. The charging time is too long, so two sets of batteries have to be equipped for replacement or fast-charging lithium-ion batteries have to be purchased, which brings higher use costs to customers. Some manufacturers simply use high current to quickly charge the battery to extend the working time, but the battery temperature rise is too high, which has a serious impact on the battery life.

[0003] The dimensions of tubular power batteries are mainly tall and thin, with a height usually between 400-700mm, and a length and width of about 200mm. Due to the high height, the internal electrolyte will produce sedimentation and stratification, and the density of the electrolyte at the bottom is significantly higher than that of the electrolyte at the top, which will lead to inconsistent reaction states during charging. Since the heat generated at the bottom during charging cannot be removed in time, the temperature can reach 50-60℃ during conventional charging. When the temperature reaches above 55℃, it exceeds the upper limit of the battery's tolerance. When the upper limit of the tolerance is exceeded, the reaction rate inside the battery will double for every 10℃ increase in battery temperature, which means that the corrosion rate doubles, resulting in the battery life being shortened by half. The positive electrode of the tubular power battery uses polyester tubes to cover the active material, which will make it difficult for the acid to penetrate. When charging with a large current, the acid cannot be replenished quickly, affecting the conversion of the active material. Therefore, it is extremely difficult to increase the charging speed simply by increasing the charging current, and the side effects are obvious.

[0004] For example, the patent with publication number CN111313116A proposes a fast charging method for lead-acid batteries, but its shortcomings are: the charging time is still relatively long, between 4 and 5 hours; the charging current in the first stage reaches 0.3C, and the simple use of large current direct charging will cause the temperature to rise rapidly, and no effective cooling measures are taken, which will accelerate the corrosion of the battery and shorten its life. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a method for intermittent rapid energy replenishment of tubular power batteries, which has high charging efficiency, prolongs the life of the battery and improves the performance of the battery.

[0006] The intermittent rapid energy replenishment method for the tubular power battery of the present invention connects the tubular power batteries in series with connecting wires, connects the two ends of the tubular power batteries with the positive lead wire and the negative lead wire to the intelligent charger, connects the air pipe inside the battery box with the external air circulation pipeline, and the air circulation pipeline is further connected to the air circulation pump, starts the intelligent charger and the air circulation pump at the same time to perform current charging, blows compressed air into the battery box through the air circulation pump, opens the battery cover to discharge the gas, so as to facilitate the heat dissipation of the battery, and controls the electrolyte temperature at 55°C to 60°C throughout the whole process.

[0007] The air circulation pump is set to: air pressure 60-80mbar, air flow 100-150L / h, compressed air is introduced into the battery, and the compressed air and charging current need to be turned on at the same time to prevent electrolyte stratification, eliminate internal polarization, and improve reaction efficiency. The air can quickly carry the heat inside the battery, lower the reaction temperature, reduce the charging multiples, and reduce water loss.

[0008] The specific charging current of the intelligent charger is as follows:

[0009] a. Charge at 0.1-0.2C current for 3-5 minutes;

[0010] b. Charge at 0.2-0.35C current for 5-7 minutes;

[0011] c. Charge at 0.35-0.4C current for 5-7 minutes;

[0012] d. Charge at 0.4-0.45C current for 9-12 minutes;

[0013] e. Charge at 0.45-0.5C current for 55-60 minutes;

[0014] f. Charge at 0.3-0.4C current for 5-7 minutes;

[0015] g. Charge at 0.2-0.3C current for 5-7 minutes.

[0016] In the process of controlling a→d, the charging time is controlled within 35 minutes, and a small current progressive charging is used, which is conducive to the diffusion of sulfuric acid, reduces polarization, and prevents the temperature from rising rapidly.

[0017] The total charging multiple of the intelligent charger is controlled between 1.01 and 1.05 times of the discharge capacity. Usually, the charging multiple is above 1.25 times of the discharge capacity. Reducing the charging multiple can slow down the excessive corrosion of the plate, which is beneficial to prolonging the battery life.

[0018] The charging range of the tubular power battery is between 20% and 95% of the rated capacity of the battery. This stage is the stage where the battery has the strongest charging acceptance capacity. When the charging current exceeds 85% of the rated capacity, an O2 release reaction occurs on the positive plate, and the acceptance capacity decreases rapidly. When the charging current exceeds 95% of the rated capacity, an H2 release reaction occurs on the negative plate, and the acceptance capacity decreases rapidly, resulting in a smaller charging current, longer charging time, higher battery voltage, higher temperature, and more side reactions. Using high current fast charging beyond this stage will seriously damage the battery life.

[0019] The air circulation pump is set to control the electrolyte temperature of the tubular power battery to 55℃~60℃. The maximum charging current is controlled at 0.5C. Usually, the battery temperature is a linear function of the current. The increase of charging current will lead to the increase of battery temperature. Therefore, a reasonable maximum charging current can control the battery temperature within 60℃, effectively ensuring the battery life. The total charging time is controlled between 1 and 2 hours, and the lunch break or other intermittent time can be fully utilized to recharge the battery to meet the work needs of a day.

[0020] The device used in the intermittent rapid energy replenishment method for tubular power batteries includes an intelligent charger and a battery box. The intelligent charger is provided with an air circulation pump. The battery box is provided with multiple groups of tubular power batteries. The multiple groups of tubular power batteries are connected in series through connecting lines. A single air pipe is provided inside the battery box. The single air pipe is connected to an air circulation pipeline, and the air circulation pipeline is connected to the air circulation pump.

[0021] The negative electrode lead wire and the positive electrode lead wire of the tubular power battery are correspondingly connected to the intelligent charger via a charging wire (10).

[0022] The tubular power battery is provided with a battery upper cover.

[0023] In the fast charging process of the present invention, the current gradually increases from 0.1C ampere to 0.5C ampere, and the time is controlled within 30 minutes. The charging acceptance of the tubular positive plate is poor. Directly using a large current for charging will cause the battery voltage to quickly rise to more than 2.5V, resulting in a decrease in the charging acceptance of the battery. In addition, the internal sulfuric acid density of the battery is low before charging, the lead sulfate content of the plate is high, and the internal resistance of the battery is large. Directly using a large current for charging will also cause the temperature to rise too fast. Using a small current for progressive charging is conducive to the diffusion of sulfuric acid and reduces polarization. The electrochemical reaction of the battery is a gradually accelerated process. The full activation of lead sulfate is a necessary stage for efficient charging. Controlling the charging time of the large current stage can also prevent the temperature from rising rapidly.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention adopts air circulation to cool the battery, which can effectively control the battery temperature within a reasonable range, reducing the temperature rise by more than 15°C compared with conventional fast charging, and its charging voltage can be controlled within 2.65V, reducing water loss by up to 80%, improving reaction efficiency, and reducing charging energy consumption by more than 25%, preventing side reactions from occurring, and effectively extending the battery life. A special small current progressive charging method is adopted to ensure full activation of the battery, and the battery capacity can be increased to more than 80% in a relatively short time, which is nearly 70% shorter than the conventional fast charging time. On the basis of not increasing the cost for customers, it effectively extends the working time and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a device used in the intermittent rapid energy replenishment method for a tubular power battery of the present invention.

[0027] In the figure: 1. Smart charger; 2. Air circulation pump; 3. Negative lead wire; 4. Positive lead wire; 5. Air circulation pipeline; 6. Connecting wire; 7. Tubular power battery; 8. Single air tube; 9. Battery cover; 10. Charging cable; 11. Battery box. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments.

[0029] like Figure 1 As shown, the device used in the intermittent rapid energy replenishment method of the tubular power battery includes an intelligent charger 1 and a battery box 11. An air circulation pump 2 is provided inside the intelligent charger 1. Multiple groups of tubular power batteries 7 are provided inside the battery box 11. The multiple groups of tubular power batteries 7 are connected in series through a connecting line 6. A single air pipe 8 is provided inside the battery box 11. The single air pipe 8 is connected to the air circulation pipeline 5, and the air circulation pipeline 5 is connected to the air circulation pump 2. The negative lead wire 3 and the positive lead wire 4 of the tubular power battery 7 are correspondingly connected to the intelligent charger 1 through the charging line 10. A battery cover 9 is provided on the tubular power battery 7.

[0030] The following embodiments are all carried out using the above device.

[0031] Example 1

[0032] Taking 5DB500H as an example, the intermittent rapid energy replenishment method of the tubular power battery includes the following steps:

[0033] Connect the battery lead wire to the smart charger, connect the battery air circulation pipeline to the air circulation pump, start the current charging and air circulation pump at the same time, open the battery cover to facilitate battery heat dissipation, and control the electrolyte temperature at 55℃~60℃ throughout the process. The air circulation pump introduces compressed air into the battery at an air pressure of 80mbar and an air flow of 140L / h. The compressed air and charging current are turned on at the same time.

[0034] The specific charging current of the intelligent charger is as follows:

[0035] a. Charge at 0.15C current for 3 minutes, C = 500;

[0036] b. Charge at 0.2C current for 5 minutes;

[0037] c. Charge at 0.3C current for 5 minutes;

[0038] d. Charge at 0.4C current for 10 minutes;

[0039] e. Charge at 0.48C current for 60 minutes;

[0040] f. Charge at 0.35C current for 5 minutes;

[0041] g, 0.2C current charging for 5 minutes;

[0042] The 5DB500H battery was quickly charged using Example 1, with a total charging time of 1.55 h and a total charge of 0.63 C. After testing, the water loss of the battery was 17 mL. The battery discharge capacity reached 80%, and the life was 1250 times. The battery performance met the actual requirements of the customer.

[0043] Example 2

[0044] Taking 7DB630H as an example, the intermittent rapid energy replenishment method of the tubular power battery includes the following steps:

[0045] Connect the battery lead wire to the smart charger, connect the battery air circulation pipeline to the air circulation pump, start the current charging and air circulation pump at the same time, open the battery cover to facilitate battery heat dissipation, and control the electrolyte temperature at 55℃~60℃ throughout the process. The air circulation pump introduces compressed air into the battery at an air pressure of 75mbar and an air flow of 130L / h. The compressed air and charging current are turned on at the same time.

[0046] The specific charging current of the intelligent charger is as follows:

[0047] a. Charge at 0.17C for 3 min, C = 630;

[0048] b. Charge at 0.25C current for 5 minutes;

[0049] c. Charge at 0.3C current for 5 minutes;

[0050] d. Charge at 0.4C current for 10 minutes;

[0051] e. Charge at 0.5C current for 60 minutes;

[0052] f. Charge at 0.4C current for 5 minutes;

[0053] g, 0.3C current charging for 5 minutes;

[0054] The 7DB630H battery was quickly charged using Example 2, with a total charging time of 1.5 hours and a total charge of 0.67 C. After testing, the water loss of the battery was 22 mL. The battery discharge capacity reached 82%, and the life was 1300 times. The battery performance met the actual requirements of the customer.

[0055] Example 3

[0056] Taking 7DB420H as an example, the intermittent rapid energy replenishment method of the tubular power battery includes the following steps:

[0057] Connect the battery lead wire to the smart charger, connect the battery air circulation pipeline to the air circulation pump, start the current charging and air circulation pump at the same time, open the battery cover to facilitate battery heat dissipation, and control the electrolyte temperature at 55℃~60℃ throughout the process. The air circulation pump introduces compressed air into the battery at an air pressure of 60mbar and an air flow of 100L / h. The compressed air and charging current are turned on at the same time.

[0058] The specific charging current of the intelligent charger is as follows:

[0059] a. Charge at 0.13C for 4 minutes, C = 420;

[0060] b. Charge at 0.2C current for 5 minutes;

[0061] c. Charge at 0.3C current for 7 minutes;

[0062] d. Charge at 0.4C current for 12 minutes;

[0063] e. Charge at 0.45C current for 60 minutes;

[0064] f. Charge at 0.3C current for 5 minutes;

[0065] g, 0.2C current charging for 5 minutes;

[0066] The 7DB420H battery was quickly charged using Example 3, with a total charging time of 1.57 hours, a total charge of 0.62C, and a water loss of 15 mL. After testing, the battery discharge capacity reached 85%, and the life was 1350 times. The battery performance met the actual requirements of customers.

[0067] Comparative Example 1

[0068] Taking 7DB420H as an example, the conventional power battery fast charging method is used for charging, including the following steps:

[0069] Connect the battery lead to the charger, start the charging current, and open the battery cover to facilitate heat dissipation of the battery.

[0070] The specific charging current of the charger is as follows:

[0071] a. Charge at 0.3C current for 130 min, C = 420;

[0072] b. Charge at 0.15C current for 140 minutes;

[0073] The 7DB420H battery was quickly charged using Comparative Example 1, with a total charging time of 4.5 hours, a total charge of 1C, an electrolyte temperature of 75°C to 80°C, and a water loss of 76mL. The battery discharge capacity reached 80% and the lifespan was 650 times.

[0074] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and equal changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention should all fall within the scope of the patent coverage of the present invention.

Claims

1. A method for intermittent rapid energy replenishment of a tubular power battery, characterized in that: Connect the tubular power batteries in series with connecting wires, connect the positive and negative lead wires at both ends of the tubular power batteries to the smart charger, connect the air pipe inside the battery box to the external air circulation pipeline, and connect the air circulation pipeline to the air circulation pump, start the smart charger and the air circulation pump at the same time to charge with current, and blow compressed air into the battery box through the air circulation pump for fast charging; The air circulation pump is set to: air pressure 60-80mbar, air flow 100-150L / h.

2. The intermittent rapid energy replenishment method for tubular power batteries according to claim 1, characterized in that: The specific charging current of the intelligent charger is as follows: a. Charge at 0.1-0.2C current for 3-5 minutes; b. Charge at 0.2-0.35C current for 5-7 minutes; c. Charge at 0.35-0.4C current for 5-7 minutes; d. Charge at 0.4-0.45C current for 9-12 minutes; e. Charge at 0.45-0.5C current for 55-60 minutes; f. Charge at 0.3-0.4C current for 5-7 minutes; g. Charge at 0.2-0.3C current for 5-7 minutes.

3. The intermittent rapid energy replenishment method for tubular power batteries according to claim 2, characterized in that: In the process of controlling a→d, the charging time is controlled within 35 minutes.

4. The intermittent rapid energy replenishment method for tubular power batteries according to claim 2, characterized in that: The total charging multiple of the intelligent charger is controlled between 1.01 and 1.05 times of the discharge capacity.

5. The intermittent rapid energy replenishment method for tubular power batteries according to claim 1, characterized in that: The charging range of the tubular power battery is between 20% and 95% of the rated capacity of the battery.

6. The intermittent rapid energy replenishment method for tubular power batteries according to claim 1, characterized in that: The air circulation pump is set to control the electrolyte temperature of the tubular power battery to be 55°C to 60°C.

7. The intermittent rapid energy replenishment method for tubular power batteries according to claim 1, characterized in that: The device used in the intermittent rapid energy replenishment method for a tubular power battery comprises an intelligent charger (1) and a battery box (11), wherein an air circulation pump (2) is arranged inside the intelligent charger (1), wherein a plurality of groups of tubular power batteries (7) are arranged inside the battery box (11), wherein the plurality of groups of tubular power batteries (7) are connected in series via a connecting line (6), wherein a single air pipe (8) is arranged inside the battery box (11), wherein the single air pipe (8) is connected to an air circulation pipeline (5), and wherein the air circulation pipeline (5) is connected to the air circulation pump (2).

8. The intermittent rapid energy replenishment method for tubular power batteries according to claim 7, characterized in that: The negative electrode lead wire (3) and the positive electrode lead wire (4) of the tubular power battery (7) are correspondingly connected to the intelligent charger (1) via a charging wire (10).

9. The intermittent rapid energy replenishment method for tubular power batteries according to claim 1, characterized in that: A battery upper cover (9) is provided on the tubular power battery (7).

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