Anti-apnea electric vehicle battery charging method

Abstract

The present invention discloses a method for charging an electric vehicle battery to prevent suffocation, which relates to the technical field of batteries. In the present invention, a hard pipe is connected 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 suffocation during the formation process. At the same time, in the present invention, through holes are provided at the lower part of the inner grid lining of the battery, which can avoid the problem of acid liquid shortage in the corresponding battery compartment when the acid inlet pipe is blocked, ensure the effective circulation of acid liquid even when the acid inlet pipe is blocked, and thus avoid the problem of poor formation effect of the battery. In addition, in the present invention, a high-temperature multi-stage charging method is adopted during acid circulation formation, which can accelerate the conversion rate between active substances within an effective charging time, shorten the formation cycle, and improve the overall formation effect.

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:

[0008] Anti - suffocation type electric vehicle battery charging method. The battery is provided with several compartments, and adjacent compartments are separated by inner grid liners. Each compartment is provided with a liquid injection port at the top; a connector is connected to the liquid injection port. The connector includes a main body, and an acid inlet pipe and an acid return pipe are arranged on the main body. 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 of the acid inlet pipe of another compartment through a hard pipe, so that each compartment is connected to form an acid liquid passage; several through - holes are arranged at the lower part of the inner grid liner, and the height h of the through - holes from the bottom of the inner grid liner satisfies 5.5mm ≤ h ≤ 6.5mm. This is because there is a pad with a height of 5mm at the bottom of the compartment. If the height of the through - holes on the inner grid liner is too low, the pad will form an obstacle to the flow of acid liquid during circulation, affecting the acid liquid circulation effect in the compartment; and usually, the acid liquid enters the battery interior from the acid inlet pipe, then flows to the bottom and then back to the upper part, and finally returns to the acid return pipe to form a complete cycle. After setting through - holes on the inner grid liner, the smooth flow of acid liquid in different compartments can be realized, effectively avoiding the problem of unsmooth circulation caused by suffocation or pipeline blockage; however, if the height of the through - holes is too high, the flow direction of the acid liquid will be changed. After the acid liquid enters the battery interior, affected by the height of the through - holes, a bottom - sealed cycle cannot be formed, and a part of the acid liquid will return to the acid return pipe without flowing to the bottom, resulting in an incomplete circulation effect, which will directly affect the battery formation effect;

[0009] Acid circulation formation is carried out through a multi - stage charging method:

[0010] The first stage: constant - current charging, the charging current is 0.15C5, the charging time is 0.5h, and the system circulation temperature is 25 - 35°C;

[0011] The second stage: constant - current charging, the charging current is 0.25C5, the charging time is 0.5h, and the system circulation temperature is 35 - 45°C;

[0012] The third stage: constant - current charging, the charging current is 0.35C5, the charging time is 10h, and the system circulation temperature is 55 - 65°C;

[0013] The fourth stage: constant - current charging, the charging current is 0.3C5, the charging time is 4h, and the system circulation temperature is 50 - 60°C;

[0014] The fifth stage: constant - current charging, the charging current is 0.25C5, the charging time is 2h, and the system circulation temperature is 35 - 45°C;

[0015] The sixth stage: constant - voltage 2.6V charging, the charging time is 2 - 5h, and the system circulation temperature is 25 - 35°C.

[0016] Preferably, in the multi - stage charging method, the total charging time is 19 - 22h, and the total charged amount of electricity is 5.7C5 - 6C5.

[0017] Preferably, the rigid tube is made of PP material.

[0018] Preferably, the rigid tube is in an L shape.

[0019] Preferably, both ends of the rigid tube are respectively sleeved in two flexible tubes, and external threads are provided at both ends of the rigid tube.

[0020] Preferably, the inner diameter of the rigid tube is 7.5 - 8.5 mm.

[0021] Preferably, three through holes are arranged at intervals, and the through holes are round holes with a diameter of 19 - 21 mm.

[0022] Preferably, an acid inlet channel and an acid return channel are arranged 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.

[0023] Preferably, the battery is provided with three compartments, namely a first compartment, a second compartment and a third compartment in sequence. The acid inlet pipe of the first compartment is connected to the liquid outlet of an acid liquid tank through a flexible tube, and the flexible tube on the acid return pipe is connected to the flexible tube of the acid inlet pipe of the third compartment through a rigid tube; the flexible tube on the acid return pipe of the third compartment is connected to the flexible tube of the acid inlet pipe of the second compartment through a rigid tube; the flexible tube of the acid return pipe of the second compartment is connected to the liquid return port of the acid liquid tank through a flexible tube.

[0024] Preferably, the flexible tube is made of perfluoroethylene material.

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

[0026] In the present invention, a rigid tube is used to connect at the original middle corner of the flexible tube, which can form a strong support for the corner of the flexible tube and effectively solve the problem of air retention during the formation process. At the same time, the present invention is provided with through holes at the lower part of the inner grid lining of the battery, which can avoid the problem of acid liquid shortage in the corresponding battery compartment when the acid inlet pipe is blocked, ensure the effective circulation of acid liquid even when the acid inlet pipe is blocked, and thus avoid the problem of poor formation effect of the battery. 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 an effective charging time, shorten the formation cycle, and improve the overall formation effect. Description of the Drawings

[0027] Figure 1 It is a partial cross-sectional view of the connector of the present invention.

[0028] In the figure, 1. Main body; 101. Acid inlet pipe; 102. Acid return pipe; 103. Acid inlet channel; 104. Acid return channel. Detailed Embodiments

[0029] To enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0030] In the following embodiments, the battery is provided with three compartments, namely the first compartment, the second compartment and the third compartment in sequence. The adjacent compartments are separated by an inner grid liner, and three circular through holes are arranged at intervals in the lower part of the inner grid liner; a liquid injection port is arranged at the top of each compartment, and a connector is connected to the liquid injection port. As Figure 1 shown, the connector includes a main body 1. An acid inlet channel 103 and a back acid channel 104 are arranged in the main body 1. An acid inlet pipe 101 and a back acid pipe 102 are arranged at the upper part of the main body 1. The acid inlet pipe 101 is communicated with the acid inlet channel 103, and the back acid pipe 102 is communicated with the back acid channel 104. Perfluoroalkoxy (PFA) hoses are respectively connected to the acid inlet pipe 101 and the back acid pipe 102. The acid inlet pipe 101 of the first compartment is connected to the liquid outlet of an acid liquid tank through a hose, and the hose on the back acid 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 back acid 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 hose on the back acid pipe 102 of the second compartment is connected to the liquid return port of the acid liquid tank through a hose, and each compartment is connected through hoses and hard pipes to form an acid liquid passage. Among them, the hard pipe 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 of the hard pipe and the hose, the two ends of the hard pipe can be respectively sleeved in two hoses, and external threads are arranged at both ends of the hard pipe.

[0031] Embodiment 1

[0032] In this embodiment, the diameter of the through hole on the inner grid liner is 19 mm, the height from the bottom of the inner grid liner is 5.5 mm, and the inner diameter of the hard pipe is 7.5 mm.

[0033] The anti - suffocation type electric vehicle battery charging method in this embodiment performs acid circulation formation through a multi - stage charging method:

[0034] The first stage: constant - current charging, the charging current is 0.15C5, the charging time is 0.5 h, and the system circulating temperature is 25 °C;

[0035] The second stage: constant - current charging, the charging current is 0.25C5, the charging time is 0.5 h, and the system circulating temperature is 35 °C;

[0036] The third stage: constant - current charging, the charging current is 0.35C5, the charging time is 10 h, and the system circulating temperature is 55 °C;

[0037] The fourth stage: constant - current charging, the charging current is 0.3C5, the charging time is 4 h, and the system circulating temperature is 50 °C;

[0038] The fifth stage: constant current charging, charging current 0.25C5, charging time 2h, system cycling temperature 35°C;

[0039] The sixth stage: constant voltage charging at 2.6V, charging time 2h, system cycling temperature 25°C.

[0040] For the multi-stage charging method of this embodiment, the total charging time is 19h, and the total charged amount is 5.7C5.

[0041] Embodiment 2

[0042] In this embodiment, the diameter of the through hole on the inner grid liner is 20mm, the height from the bottom of the inner grid liner is 6mm, and the inner diameter of the hard tube is 8mm.

[0043] The anti-airlock electric vehicle battery charging method of this embodiment performs acid circulation formation through a multi-stage charging method:

[0044] The first stage: constant current charging, charging current 0.15C5, charging time 0.5h, system cycling temperature 35°C;

[0045] The second stage: constant current charging, charging current 0.25C5, charging time 0.5h, system cycling temperature 45°C;

[0046] The third stage: constant current charging, charging current 0.35C5, charging time 10h, system cycling temperature 65°C;

[0047] The fourth stage: constant current charging, charging current 0.3C5, charging time 4h, system cycling temperature 60°C;

[0048] The fifth stage: constant current charging, charging current 0.25C5, charging time 2h, system cycling temperature 45°C;

[0049] The sixth stage: constant voltage charging at 2.6V, charging time 4h, system cycling temperature 35°C.

[0050] For the multi-stage charging method of this embodiment, the total charging time is 21h, and the total charged amount is 6C5.

[0051] Embodiment 3

[0052] In this embodiment, the diameter of the through hole on the inner grid liner is 21mm, the height from the bottom of the inner grid liner is 6.5mm, and the inner diameter of the hard tube is 8.5mm.

[0053] The anti-airlock electric vehicle battery charging method of this embodiment performs acid circulation formation through a multi-stage charging method:

[0054] The first stage: constant current charging, charging current 0.15C5, charging time 0.5h, system cycling temperature 30°C;

[0055] The second stage: constant current charging, charging current 0.25C5, charging time 0.5h, system cycling temperature 40°C;

[0056] The third stage: constant current charging, charging current 0.35C5, charging time 10h, system cycling temperature 60°C;

[0057] The fourth stage: constant current charging, charging current 0.3C5, charging time 4h, system cycling temperature 55°C;

[0058] The fifth stage: constant current charging, charging current 0.25C5, charging time 2h, system cycling temperature 40°C;

[0059] The sixth stage: constant voltage charging at 2.6V, charging time 5h, system cycling temperature 30°C.

[0060] For the multi-stage charging method of this embodiment, the total charging time is 22h, and the total charged amount is 6C5.

[0061] Comparative example 1

[0062] The difference from Example 1 is that no through holes are provided at the lower part of the inner grid lining.

[0063] Comparative example 2

[0064] 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 the acid liquid passage is formed by connecting each compartment through a hose.

[0065] The performance of the batteries of Examples 1-3 and Comparative examples 1-2 was tested. The test was carried out with reference to "GB / T 7403.1-2018 Traction lead-acid batteries - Part 1: Technical conditions". For the actual capacity in the first capacity test, it should not be less than 90% of the rated capacity; and in the first ten capacity tests, at least one time the actual capacity should reach the rated capacity. The test results are shown in Table 1:

[0066] Table 1 Performance test results of the batteries of Examples 1-3 and Comparative examples 1-2

[0067]

[0068] By comparing the data of Example 1 and Comparative Example 1 in Table 1, it can be seen that in Comparative Example 1, through holes were not provided at the lower part of the inner grid liner. When the liquid inlet pipe was blocked, the corresponding compartment could not communicate with other compartments, resulting in the lack of acid in this battery compartment. The battery was formed under abnormal conditions, so when performing the capacity test, the first discharge capacity and the highest discharge capacity in the first ten times of the battery did not reach 90% of the rated capacity, and the electrode plates showed a slight corrosion state, not meeting the usage requirements. By comparing Example 1 and Comparative Example 2, it can be seen that in Comparative Example 2, hard pipes were not used for connecting the acid passage. During the circulation process, the acid circulation was not smooth at the middle corner bending part of the flexible pipe, and the acid replacement after the electrode plates were formed was not complete. There was a problem of acid stratification in the battery. When performing the capacity test, the first discharge capacity did not reach 90% of the rated capacity. Although the highest discharge capacity in the first ten times increased, it also did not reach 100% of the rated capacity, not meeting the usage requirements.

[0069] Comparative Example 3

[0070] The difference from Example 2 is that Comparative Example 3 carried out acid circulation formation through the following multi-stage charging method:

[0071] First stage: Constant current charging, charging current 0.15C5, charging time 1 h, system circulation temperature 35 °C;

[0072] Second stage: Constant current charging, charging current 0.25C5, charging time 12 h, system circulation temperature 45 °C;

[0073] Third stage: Constant current charging, charging current 0.2C5, charging time 12 h, system circulation temperature 35 °C;

[0074] Fourth stage: Constant current charging, charging current 0.1C5, charging time 6 h, system circulation temperature 30 °C.

[0075] For the multi-stage charging method of Comparative Example 3, the total charging time was 31 h, and the total charge input was 6.15C5.

[0076] By comparing Example 2 and Comparative Example 3, it can be seen that since Comparative Example 3 did not adopt the high-temperature formation charging parameters, although the formation state of the electrode plates was good, the production cycle was long, and the acid circulation formation time was extended by 10 h.

Claims

1. Anti-apnea electric vehicle battery charging method, the battery is provided with a number of compartments, adjacent compartments are separated by inner grid liners, and each compartment is provided with a liquid injection port at the top; characterized in that, A connector is connected to the liquid injection port. The connector includes a main body (1). An acid inlet pipe (101) and an acid return pipe (102) are arranged on the main body (1). Hoses are respectively connected to the acid inlet pipe (101) and the acid return pipe (102). The hose on the acid return pipe (102) of one compartment is connected to the hose of the acid inlet pipe (101) of another compartment through a hard pipe, so as to connect each compartment to form an acid liquid passage. A plurality of through holes are arranged 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; The acid circulation formation is carried out by a multi-stage charging method: The first stage: constant current charging, the charging current is 0.15C5, the charging time is 0.5h, and the system circulation temperature is 25 - 35°C; The second stage: constant current charging, the charging current is 0.25C5, the charging time is 0.5h, and the system circulation temperature is 35 - 45°C; The third stage: constant current charging, the charging current is 0.35C5, the charging time is 10h, and the system circulation temperature is 55 - 65°C; The fourth stage: constant current charging, the charging current is 0.3C5, the charging time is 4h, and the system circulation temperature is 50 - 60°C; The fifth stage: constant current charging, the charging current is 0.25C5, the charging time is 2h, and the system circulation temperature is 35 - 45°C; The sixth stage: constant voltage 2.6V charging, the charging time is 2 - 5h, and the system circulation temperature is 25 - 35°C.

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

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

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

5. The anti - suffocation type electric vehicle battery charging method according to claim 1, characterized in that, Both ends of the hard pipe are respectively sleeved in two hoses, and external threads are arranged at both ends of the hard pipe.

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

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

8. The anti - suffocation type electric vehicle battery charging method according to claim 1, characterized in that, An acid inlet channel (103) and an acid return channel (104) are arranged in the main body (1). The acid inlet pipe (101) is communicated with the acid inlet channel (103), and the acid return pipe (102) is communicated with the acid return channel (104).

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

10. The anti - suffocation type electric vehicle battery charging method according to claim 1, characterized in that, The hose is made of perfluoroethylene material.

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