Anti-suffocation type electric vehicle battery charging method

Abstract

The invention discloses an anti-suffocation type electric vehicle battery charging method, and relates to the technical field of batteries. The original middle corner of the hose is connected through the hard pipe, the corner of the hose can be powerfully supported, and the problem of suffocation in the formation process can be effectively solved; meanwhile, the through holes are formed in the lower part of the inner grid lining plate of the battery, so that the problem that the corresponding battery compartment is lack of acid liquor when the acid inlet pipe is blocked can be avoided, and effective circulation of the acid liquor can still be ensured under the condition that the acid inlet pipe is blocked, so that the problem that the formation effect of the battery is poor is avoided; in addition, a high-temperature multi-stage charging mode is adopted during acid cycle formation, so that the conversion rate between active substances can be accelerated, the formation period can be shortened, and the overall formation effect can be improved within effective charging time.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a method for charging a battery of an anti-suffocation electric vehicle. Background Art

[0002] During the acid circulation formation process of the lead-acid battery used in multi-volt electric vehicles, the various compartments inside the battery need to be connected to each other through a sophisticated piping system to achieve the circulation of acid. Specifically, each compartment has an acid inlet pipe and an acid return pipe on the injection port, which are responsible for introducing and discharging acid into and out of the compartment. In order to connect the acid inlet pipes and acid return pipes of different compartments to form a continuous acid passage, a hose is usually used to connect the acid inlet pipe and the acid return pipe.

[0003] However, there are some potential problems with this connection process. If the hose used is too short, acid leakage or acid seepage may occur at the connection between the acid inlet pipe, the acid return pipe and the hose due to inadequate connection. This leakage will not only waste precious electrolyte, but may also cause corrosion to the battery casing and the surrounding environment, and even pose a safety risk. In order to solve this problem, it may be considered to increase the length of the hose to ensure the adequacy of the connection. However, doing so will bring new problems, that is, the increased hose is easily squeezed and deformed at the corner in the middle, causing the pipe to bend, and there will be a problem of holding the breath during the acid circulation formation process; and during the acid circulation formation process, due to the pressure inside the pipe, the degree of this bending may be further aggravated. The bent hose will hinder the smooth flow of the acid, resulting in poor circulation, which in turn affects the formation effect and performance of the battery.

[0004] In addition, during the charging process, if the acid inlet pipe is blocked, the corresponding battery compartment will not be able to get enough acid replenishment. This lack of acid will directly affect the acid circulation effect of the battery, which may cause the battery capacity to decrease, shorten its life, or even damage the battery.

[0005] Therefore, it is necessary to develop new electric vehicle battery charging methods to solve the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art, to provide an anti-suffocation type electric vehicle battery charging method, to adopt a hard pipe connection at the original middle corner of the hose to solve the problem of suffocation during the formation process; to set a through hole at the lower part of the inner grid lining of the battery to ensure that the effective circulation of the acid solution can be guaranteed when the acid inlet pipe is blocked; and at the same time, during the acid circulation formation, a high-temperature multi-stage charging method is adopted to improve the overall formation effect.

[0007] The technical solution of the present invention is: The invention discloses a method for charging a battery of an electric vehicle with an anti-suffocation function, wherein the battery is provided with a plurality of compartments, adjacent compartments are separated by an inner grid lining plate, and a liquid injection port is provided on the top of each compartment; a connector is connected to the liquid injection port, and the connector includes a main body, and an acid inlet pipe and an acid return pipe are provided on the main body, and hoses are respectively connected to the acid inlet pipe and the acid return pipe; the hose on the acid return pipe of one compartment is connected to the hose on the acid inlet pipe of another compartment through a hard pipe, so that each compartment is connected to form an acid passage; a plurality of through holes are provided at the lower part of the inner grid lining plate, and the height h of the through holes from the bottom of the inner grid lining plate satisfies 5.5mm≤h≤6.5mm, because a pad with a height of 5mm is provided at the bottom of the compartment, and if the height of the through hole on the inner grid lining plate is too low , the pads will form obstacles that hinder the circulation of acid during circulation, affecting the circulation effect of the acid in the compartments; and usually, the acid enters the battery from the acid inlet pipe, then flows to the bottom and then flows back to the top, and finally flows back to the acid return pipe to form a complete cycle. After the through holes are set on the inner grid lining, the smooth circulation of acid in different compartments can be achieved, effectively avoiding the problem of unsmooth circulation caused by holding back air or pipe blockage; however, if the height of the through hole is too high, the flow direction of the acid is changed. After the acid enters the battery, it is affected by the height of the through hole and cannot form a closed circulation at the bottom. Part of the acid will not be able to flow to the bottom and will flow back to the acid return pipe, resulting in incomplete circulation effect, which will directly affect the battery formation effect; Acid cycle formation through multi-stage charging method: The first stage: constant current charging, charging current 0.15C 5 , charging time 0.5h, system circulation temperature 25-35℃; The second stage: constant current charging, charging current 0.25C 5 , charging time 0.5h, system circulation temperature 35-45℃; The third stage: constant current charging, charging current 0.35C 5 , charging time 10h, system circulation temperature 55-65℃; The fourth stage: constant current charging, charging current 0.3C 5 , charging time 4h, system circulation temperature 50-60℃; The fifth stage: constant current charging, charging current 0.25C 5 , charging time 2h, system circulation temperature 35-45℃; Stage 6: Constant voltage 2.6V charging, charging time 2-5h, system circulation temperature 25-35℃.

[0008] Preferably, in the multi-stage charging method, the total charging time is 19-22h, and the total charging power is 5.7C 5 -6C 5 .

[0009] Preferably, the hard tube is made of PP material.

[0010] Preferably, the rigid tube is L-shaped.

[0011] Preferably, both ends of the hard tube are respectively sleeved in two soft tubes, and both ends of the hard tube are provided with external threads.

[0012] Preferably, the inner diameter of the hard tube is 7.5-8.5 mm.

[0013] Preferably, three through holes are arranged at intervals, and the through holes are circular holes with a diameter of 19-21 mm.

[0014] Preferably, an acid inlet channel and an acid return channel are provided in the main body, the acid inlet pipe is communicated with the acid inlet channel, and the acid return pipe is communicated with the acid return channel.

[0015] Preferably, the battery is provided with three compartments, namely the first compartment, the second compartment and the third compartment, the acid inlet pipe of the first compartment is connected to the liquid outlet of the acid tank through a hose, the hose on the acid return pipe is connected to the hose of the acid inlet pipe of the third compartment through a hard pipe; the hose on the acid return pipe of the third compartment is connected to the hose of the acid inlet pipe of the second compartment through a hard pipe; the acid return pipe of the second compartment is connected to the liquid return port of the acid tank through a hose.

[0016] Preferably, the hose is made of polyperfluoroethylene.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a hard pipe connection at the original middle corner of the hose, which can form a strong support for the corner of the hose and effectively solve the problem of holding breath during the formation process. At the same time, the present invention arranges a through hole at the lower part of the inner grid lining of the battery, which can avoid the problem of acid liquid missing in the corresponding battery compartment when the acid inlet pipe is blocked, and ensures that the effective circulation of the acid liquid can still be guaranteed when the acid inlet pipe is blocked, thereby avoiding the problem of poor battery formation effect. In addition, the present invention adopts a high-temperature multi-stage charging method during acid circulation formation, which can accelerate the conversion rate between active substances within the effective charging time, shorten the formation cycle, and improve the overall formation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial cross-sectional view of the connector of the present invention.

[0019] In the figure, 1, main body; 101, acid inlet pipe; 102, acid return pipe; 103, acid inlet channel; 104, acid return channel. DETAILED DESCRIPTION

[0020] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0021] The batteries in the following embodiments are all provided with three compartments, namely the first compartment, the second compartment and the third compartment, and the adjacent compartments are separated by an inner compartment lining plate, and three circular through holes are provided at intervals at the lower part of the inner compartment lining plate; a liquid injection port is provided at the top of each compartment, and a connector is connected to the liquid injection port. Figure 1 As shown, the connector includes a main body 1, in which an acid inlet channel 103 and an acid return channel 104 are arranged, an acid inlet pipe 101 and an acid return pipe 102 are arranged on the upper part of the main body 1, the acid inlet pipe 101 is connected to the acid inlet channel 103, the acid return pipe 102 is connected to the acid return channel 104, and the acid inlet pipe 101 and the acid return pipe 102 are respectively connected with polyperfluoroethylene hoses. The acid inlet pipe 101 of the first compartment is connected to the liquid outlet of the acid tank through a hose, the hose on the acid return pipe 102 is connected to the hose of the acid inlet pipe 101 of the third compartment through a hard pipe; the hose on the acid return pipe 102 of the third compartment is connected to the hose of the acid inlet pipe 101 of the second compartment through a hard pipe; the acid return pipe 102 of the second compartment is connected to the liquid return port of the acid tank through a hose, and each compartment is connected by a hose and a hard pipe to form an acid passage. Among them, the hard tube is L-shaped and made of PP material; at the same time, in order to increase the airtightness and connection firmness of the connection end between the hard tube and the soft tube, the two ends of the hard tube can be respectively put into the two soft tubes, and external threads are set at both ends of the hard tube.

[0022] Example 1 In this embodiment, the diameter of the through hole on the inner grid lining plate is 19 mm, the height from the bottom of the inner grid lining plate is 5.5 mm, and the inner diameter of the hard tube is 7.5 mm.

[0023] The anti-suffocation type electric vehicle battery charging method of this embodiment performs acid circulation formation through a multi-stage charging method: The first stage: constant current charging, charging current 0.15C 5 , charging time 0.5h, system circulation temperature 25℃; The second stage: constant current charging, charging current 0.25C 5 , charging time 0.5h, system circulation temperature 35℃; The third stage: constant current charging, charging current 0.35C 5 , charging time 10h, system circulation temperature 55℃; The fourth stage: constant current charging, charging current 0.3C 5 , charging time 4h, system circulation temperature 50℃; The fifth stage: constant current charging, charging current 0.25C 5 , charging time 2h, system circulation temperature 35℃; Stage 6: Constant voltage 2.6V charging, charging time 2h, system circulation temperature 25℃.

[0024] The multi-stage charging method of this embodiment has a total charging time of 19 hours and a total charging capacity of 5.7C. 5 .

[0025] Example 2 In this embodiment, the diameter of the through hole on the inner grid lining plate is 20 mm, the height from the bottom of the inner grid lining plate is 6 mm, and the inner diameter of the hard tube is 8 mm.

[0026] The anti-suffocation type electric vehicle battery charging method of this embodiment performs acid circulation formation through a multi-stage charging method: The first stage: constant current charging, charging current 0.15C 5 , charging time 0.5h, system circulation temperature 35℃; The second stage: constant current charging, charging current 0.25C 5 , charging time 0.5h, system circulation temperature 45℃; The third stage: constant current charging, charging current 0.35C 5 , charging time 10h, system circulation temperature 65℃; The fourth stage: constant current charging, charging current 0.3C 5 , charging time 4h, system circulation temperature 60℃; The fifth stage: constant current charging, charging current 0.25C 5 , charging time 2h, system circulation temperature 45℃; Stage 6: Constant voltage 2.6V charging, charging time 4h, system circulation temperature 35℃.

[0027] The multi-stage charging method of this embodiment has a total charging time of 21 hours and a total charging capacity of 6C. 5 .

[0028] Example 3 In this embodiment, the diameter of the through hole on the inner grid lining plate is 21 mm, the height from the bottom of the inner grid lining plate is 6.5 mm, and the inner diameter of the hard tube is 8.5 mm.

[0029] The anti-suffocation type electric vehicle battery charging method of this embodiment performs acid circulation formation through a multi-stage charging method: The first stage: constant current charging, charging current 0.15C 5 , charging time 0.5h, system circulation temperature 30℃; The second stage: constant current charging, charging current 0.25C 5 , charging time 0.5h, system circulation temperature 40℃; The third stage: constant current charging, charging current 0.35C 5 , charging time 10h, system circulation temperature 60℃; The fourth stage: constant current charging, charging current 0.3C 5 , charging time 4h, system circulation temperature 55℃; The fifth stage: constant current charging, charging current 0.25C 5 , charging time 2h, system circulation temperature 40℃; Stage 6: Constant voltage 2.6V charging, charging time 5h, system circulation temperature 30℃.

[0030] The multi-stage charging method of this embodiment has a total charging time of 22 hours and a total charging capacity of 6C. 5 .

[0031] Comparative Example 1 The difference from Example 1 is that no through hole is provided at the lower part of the inner grid lining plate.

[0032] Comparative Example 2 The difference from Example 1 is that the acid return pipe 102 of the first compartment is connected to the acid inlet pipe 101 of the third compartment through a hose, and the acid return pipe 102 of the third compartment is connected to the acid inlet pipe 101 of the second compartment through a hose, and each compartment is connected by a hose to form an acid passage.

[0033] The performance of the batteries of Examples 1-3 and Comparative Examples 1-2 was tested in accordance with GB / T 7403.1-2018 Lead-acid batteries for traction, Part 1: Technical requirements. The actual capacity should not be less than 90% of the rated capacity during the first capacity test; and the actual capacity should reach the rated capacity at least once during the first ten capacity tests. The test results are shown in Table 1: Table 1 Performance test results of batteries of Examples 1-3 and Comparative Examples 1-2

[0034] Comparing the data of Example 1 and Comparative Example 1 in Table 1, it can be seen that Comparative Example 1 does not set a through hole at the bottom of the inner grid lining, resulting in the inability of the corresponding compartment to communicate with other compartments when the liquid inlet pipe is blocked, resulting in the lack of acid in the battery compartment, and the battery is formed in an abnormal state, resulting in the battery's first discharge capacity and the first ten highest discharge capacities not reaching 90% of the rated capacity during the capacity test, and the plate is slightly corroded, which does not meet the use requirements. By comparing Example 1 with Comparative Example 2, it can be seen that Comparative Example 2 does not use a hard tube to connect the acid passage, the acid circulation is not smooth at the middle corner bend of the hose during the circulation process, the acid replacement is not thorough after the plate is formed, and the battery acid has a stratification problem, resulting in the first discharge capacity not reaching 90% of the rated capacity during the capacity test, although the first ten highest discharge capacities have increased, but also did not reach 100% of the rated capacity, which does not meet the use requirements.

[0035] Comparative Example 3 The difference from Example 2 is that Comparative Example 3 performs acid cycle formation by the following multi-stage charging method: The first stage: constant current charging, charging current 0.15C 5 , charging time 1h, system circulation temperature 35℃; The second stage: constant current charging, charging current 0.25C 5 , charging time 12h, system circulation temperature 45℃; The third stage: constant current charging, charging current 0.2C 5 , charging time 12h, system circulation temperature 35℃; The fourth stage: constant current charging, charging current 0.1C 5 , charging time 6h, system circulation temperature 30℃.

[0036] Comparative Example 3: Multi-stage charging method, total charging time is 31h, total charging capacity is 6.15C 5 .

[0037] From the comparison between Example 2 and Comparative Example 3, it can be seen that since Comparative Example 3 does not adopt high-temperature formation charging parameters, although the plate formation state is good, the production cycle is long and the acid circulation formation time is extended by 10 hours.

Claims

1. A method for charging an anti-suffocation type electric vehicle battery, wherein the battery is provided with a plurality of compartments, adjacent compartments are separated by an inner lining plate, and a liquid injection port is provided on the top of each compartment; the method is characterized in that: The liquid injection port is connected to a connector, the connector comprising a main body (1), the main body (1) being provided with an acid inlet pipe (101) and an acid return pipe (102), the acid inlet pipe (101) and the acid return pipe (102) being respectively connected with hoses; the hose on the acid return pipe (102) of one compartment is connected to the hose on the acid inlet pipe (101) of another compartment via a hard pipe, thereby connecting the compartments to form an acid liquid passage; a plurality of through holes are provided at the bottom of the inner compartment lining plate, the height h of the through holes from the bottom of the inner compartment lining plate satisfying 5.5 mm≤h≤6.5 mm; Acid cycle formation through multi-stage charging method: The first stage: constant current charging, charging current 0.15C5, charging time 0.5h, system circulation temperature 25-35℃; The second stage: constant current charging, charging current 0.25C5, charging time 0.5h, system circulation temperature 35-45℃; The third stage: constant current charging, charging current 0.35C5, charging time 10h, system circulation temperature 55-65℃; The fourth stage: constant current charging, charging current 0.3C5, charging time 4h, system circulation temperature 50-60℃; The fifth stage: constant current charging, charging current 0.25C5, charging time 2h, system circulation temperature 35-45℃; Stage 6: Constant voltage 2.6V charging, charging time 2-5h, system circulation temperature 25-35℃.

2. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: In the multi-stage charging method, the total charging time is 19-22 hours, and the total charged amount is 5.7C5-6C5.

3. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The hard tube is made of PP material.

4. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The hard tube is L-shaped.

5. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The two ends of the hard tube are respectively sleeved in two soft tubes, and the two ends of the hard tube are provided with external threads.

6. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The inner diameter of the hard tube is 7.5-8.5 mm.

7. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The through holes are arranged in three intervals, and are circular holes with a diameter of 19-21 mm.

8. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: An acid inlet channel (103) and an acid return channel (104) are provided in the main body (1); the acid inlet pipe (101) is connected to the acid inlet channel (103), and the acid return pipe (102) is connected to the acid return channel (104).

9. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The battery is provided with three compartments, namely a first compartment, a second compartment and a third compartment in sequence; the acid inlet pipe (101) of the first compartment is connected to the liquid outlet of the acid tank via a hose; the hose on the acid return pipe (102) is connected to the hose of the acid inlet pipe (101) of the third compartment via a hard pipe; the hose on the acid return pipe (102) of the third compartment is connected to the hose of the acid inlet pipe (101) of the second compartment via a hard pipe; and the acid return pipe (102) of the second compartment is connected to the liquid return port of the acid tank via a hose.

10. The anti-breathing electric vehicle battery charging method according to claim 1, characterized in that: The hose is made of polyperfluoroethylene material.

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