A method for automatically controlling water loss during the formation process of AGM batteries.

Abstract

This invention provides a method for automatically controlling water loss during the formation process of AGM batteries, belonging to the field of lead-acid battery technology. The method involves measuring the temperature before acid filling and the ambient temperature before formation after acid filling, referencing relevant data from the charging and formation of standard battery models, including the standard temperature before acid filling, the standard temperature of the upper environment of the battery before formation after acid filling, and the standard final charging current. Based on the structure and specifications of the AGM battery under test, corresponding temperature coefficients are set for the temperature before acid filling and the temperature coefficients before formation after acid filling. The measured temperature values, relevant standard values, and temperature coefficients are then imported into a formula to calculate the revised final charging current of the battery under test. This allows for adjustment of the charging current in the formation process, thereby ensuring the stability of water loss during the formation process.

Description

Technical Field

[0001] This invention belongs to the field of lead-acid battery technology, and more specifically, relates to a method for automatically controlling water loss during the formation process of AGM batteries when starting or stopping them. Background Technology

[0002] To meet emission requirements, traditional gasoline-powered vehicles have begun to incorporate start-stop functionality. AGM batteries (lead-acid batteries) are widely used in vehicles equipped with start-stop functionality due to their long lifespan, good low-temperature starting performance, and high safety.

[0003] Due to their lean electrolyte design, AGM batteries require precise control of the remaining acid level inside the battery to ensure performance. This remaining acid level is determined by both the amount of acid added and water loss during the formation process. Currently, precise control of the amount of acid added is achievable in the industry, but water loss during the formation process is significantly affected by acid temperature, cooling water temperature, battery semi-finished product temperature, and ambient temperature, making accurate control impossible. Although equipment improvements can achieve precise control of acid and cooling water temperatures, the battery semi-finished product temperature and ambient temperature are greatly affected by weather changes, causing fluctuations in water loss during the formation process.

[0004] Currently, to ensure stable water loss during battery formation, the current at the end of the formation process is usually adjusted manually. However, this method has the following drawbacks: it cannot achieve accurate control; it requires frequent manual adjustments; it has a certain lag; and it can only be adjusted based on the previous water loss result, which cannot completely solve the problem of water loss fluctuations during the formation process. Summary of the Invention

[0005] The purpose of this invention is to provide a method for automatically controlling water loss during the formation process of AGM batteries. In this method, the automatic control system detects the temperature of the semi-finished battery and the ambient temperature during the formation process and automatically corrects the formation process, thereby achieving stability of water loss during the formation process.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a method for automatically controlling water loss during the formation process of AGM batteries, comprising the following steps:

[0007] S1: Before filling with acid, measure the temperature of the AGM semi-finished battery and record the temperature as T1;

[0008] S2: Use an acid filling machine to fill the AGM semi-finished battery with acid. After the acid filling is completed, install the formation pot and enter the constant temperature water bath along the track. Measure the ambient temperature of the upper part of the AGM semi-finished battery in the water bath and record the temperature as T2.

[0009] S3: Based on the relevant data of the charging formation process of the standard model battery, the standard temperature of the AGM semi-finished battery is set as T3, the standard temperature of the upper environment of the AGM semi-finished battery in the water bath is set as T4, and the standard end-of-charge current of the standard model battery is N. According to the structure and specifications of the AGM battery to be tested, the temperature coefficient of the AGM semi-finished battery is set as K1, and the temperature coefficient of the upper environment of the AGM semi-finished battery in the water bath is set as K2. The above parameters are imported into the formula to calculate the revised end-of-charge current N1 of the AGM battery to be tested, N1=(T3-T1)*K1+(T4-T2)*K2+N;

[0010] S4: Adjust the charging current of the formation process to meet the final current N value.

[0011] In one possible implementation, in step S1, the battery before acid filling is weighed and the weight is recorded as M1; in step S2, the battery after acid filling is weighed and the weight is recorded as M2. When the difference between M2 and M1 meets the acid filling weight requirement, the AGM semi-finished battery is installed in a formation pot for formation treatment. When the difference between M2 and M1 does not meet the acid filling weight requirement, the AGM semi-finished battery is rejected.

[0012] In one possible implementation, in step S2, the acid injected by the acid injection machine adopts a constant temperature cold acid process, and the acid temperature is constant.

[0013] In one possible implementation, in step S3, the standard temperature of the AGM semi-finished battery is set to 25°C using the standard charging formation process, the standard temperature of the upper environment of the AGM semi-finished battery in the water bath is set to 25°C, the standard end-of-charge current of the battery is set to 7A, and the revised end-of-charge current N1 of the AGM battery to be tested is calculated, N1=(25-T1)*K1+(25-T2)*K2+7.

[0014] In one possible implementation, in step S3, the coefficient K1 takes a value of 0.03 to 0.07, and the coefficient K2 takes a value of 0.08 to 0.12.

[0015] The beneficial effects of the method for automatically controlling water loss during the formation process of AGM batteries provided by this invention are as follows: Compared with the prior art, by measuring the temperature before acid filling and the ambient temperature before formation after acid filling, and referring to the relevant data of charging and formation of standard model batteries, the standard temperature of the battery before acid filling, the standard temperature of the upper environment of the battery before formation after acid filling, and the standard final current as a benchmark, the corresponding temperature coefficients before acid filling and after formation are set according to the structure and specifications of the AGM battery under test. The measured temperature values, relevant standard values, and temperature coefficients are then imported into the formula to calculate the revised final current of the battery under test, thereby adjusting the charging current of the formation process and ensuring the stability of water loss during the formation process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This invention provides a step diagram of a method for automatically controlling water loss during the formation process of AGM batteries, according to an embodiment of the invention.

[0018] Figure 2 This is a flowchart illustrating a method for automatically controlling water loss during the formation process of AGM batteries, as provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please see Figure 1This invention provides a method for automatically controlling water loss during the formation process of AGM batteries when starting and stopping them. The method includes the following steps: S1: Before acid filling, the temperature of the AGM semi-finished battery is measured and recorded as T1; S2: Acid is filled into the AGM semi-finished battery using an acid filling machine. After acid filling, the formation tank is installed and enters a constant temperature water bath along a track. The ambient temperature above the AGM semi-finished battery in the water bath is measured and recorded as T2; S3: Based on the relevant data of the charging formation process of standard model batteries, the standard temperature of the AGM semi-finished battery is set as T3, and the water bath... The standard temperature of the upper environment of the AGM semi-finished battery is T4, and the standard end-of-charge current of this standard model battery is N. Based on the structure and specifications of the AGM battery to be tested, the temperature coefficient of the AGM semi-finished battery is set as K1, and the temperature coefficient of the upper environment of the AGM semi-finished battery in the water bath is set as K2. The above parameters are imported into the formula to calculate the revised end-of-charge current N1 of the AGM battery to be tested, N1=(T3-T1)*K1+(T4-T2)*K2+N; S4: Adjust the charging current of the formation process to meet the end-of-charge current N value.

[0021] This invention provides a method for automatically controlling water loss during the formation process of AGM batteries. The method involves measuring the temperature before acid filling and the ambient temperature before and after formation, referencing relevant data from the charging and formation of standard battery models, including the standard temperature before acid filling, the standard temperature of the upper environment of the battery before and after formation, and the standard final charging current. Based on the structure and specifications of the AGM battery under test, corresponding temperature coefficients are set for the temperature before and after acid filling and formation. The measured temperature values, relevant standard values, and temperature coefficients are then imported into a formula to calculate the revised final charging current of the battery under test. This allows for adjustment of the charging current in the formation process, thereby ensuring the stability of water loss during the formation process.

[0022] The present invention will be further described in conjunction with specific embodiments and detailed flowcharts.

[0023] Reference Figure 2 A method for automatically controlling water loss during the formation process of AGM batteries, which is implemented in the following way:

[0024] Before the acid filling process begins, the AGM semi-finished battery is weighed for the first time and recorded as 15kg. At the same time, the battery temperature is measured and recorded as 20℃. All the above data are transmitted to the system.

[0025] The AGM semi-finished batteries are filled with acid using an acid filling machine. The acid used for AGM battery formation employs a constant-temperature cold acid process, ensuring a relatively constant acid temperature. This acid is directly entered into the system and not monitored. After acid filling, the batteries are weighed again, and the weight is recorded as 17.5 kg. This data is then transmitted to the system. At this point, the amount of acid filled is compared with the actual weight of the battery to determine if it meets the standard. If the amount of acid filled (M2 - M1) = 17.5 - 15 = 2.5 kg and the actual weight of the battery is between 2.4 and 2.6 kg, the battery proceeds to the next step; otherwise, the battery is discarded.

[0026] Once the weight is within acceptable limits, the battery is screwed onto the formation pot. The formation pot prevents the acid inside the battery from flowing out during the formation process and cools the battery. The battery then enters the water bath along the track to prepare for formation. The water bath is a constant temperature water bath, which cools the battery during the formation process. At the same time, the relatively constant temperature of the water bath can ensure the stability of water loss during the formation process. Therefore, the water bath temperature is directly entered into the system.

[0027] Before the formation process begins, the ambient temperature above the battery in the water bath is measured and recorded as 30°C, and then transmitted to the system.

[0028] The original charging formation process was based on a semi-finished battery temperature of 25°C and an ambient temperature of 25°C at the top of the water bath. Taking a certain type of battery's charging formation process as an example (where the final current is 7A):

[0029] 1 2 3 5 6 7 stage Charge Charge Charge Discharge Charge Charge Current / A <![CDATA[I1]]> <![CDATA[I2]]> <![CDATA[I3]]> <![CDATA[I4]]> <![CDATA[I5]]> 7 Time / h <![CDATA[t1]]> <![CDATA[t2]]> <![CDATA[t3]]> <![CDATA[t4]]> <![CDATA[t5]]> <![CDATA[t6]]>

[0030] The system revises the current in step 7 based on the collected temperature. The charging currents for each stage are I1, I2, I3, I4, and I5, and the charging times for each stage are t1, t2, t3, t4, t5, and t6. The charging currents during the process and the total charging time are not used as reference data; only the final charging current of 7A is recorded. The coefficients for this battery model are K1 = 0.04 and K2 = 0.09. The revised charging current for step 7 is (25-20)*0.04 + (25-30)*0.09 + 7 = 6.75. The revised formation process is as follows:

[0031] 1 2 3 5 6 7 stage Charge Charge Charge Discharge Charge Charge Current / A <![CDATA[I1]]> <![CDATA[I2]]> <![CDATA[I3]]> <![CDATA[I4]]> <![CDATA[I5]]> 6.75 Time / h <![CDATA[t1]]> <![CDATA[t2]]> <![CDATA[t3]]> <![CDATA[t4]]> <![CDATA[t5]]> <![CDATA[t6]]>

[0032] The system generates a formation process based on the calculation results and charges the battery to form it, thereby achieving advance control of water loss during the formation process and ensuring the stability of water loss during the formation process between battery batches.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of automatically controlling water loss in the formation process of a start-stop AGM battery, characterized by, The method comprises the following steps: S1: measuring the temperature of the AGM semi-finished battery before acid filling, and recording the temperature as T1; S2: filling the AGM semi-finished battery with an acid filling machine, installing a formation kettle after acid filling is completed, and entering a constant-temperature water bath along a track, measuring the temperature of the upper environment of the AGM semi-finished battery in the water bath, and recording the temperature as T2; S3: taking the relevant data of the charging and formation process of a standard model battery as a reference, setting the standard temperature of the AGM semi-finished battery as T3, the standard temperature of the upper environment of the AGM semi-finished battery in the water bath as T4, the standard end-of-charge current of the standard model battery as N, setting the temperature coefficient of the AGM semi-finished battery as K1 according to the structure and specifications of the AGM battery to be measured, setting the temperature coefficient of the upper environment of the AGM semi-finished battery in the water bath as K2, and inputting the above parameters into a formula to calculate the revised end-of-charge current N1 of the AGM battery to be measured, N1=(T3-T1)*K1+(T4-T2)*K2+N; S4: adjusting the charging current of the formation process to meet the end-of-charge current N.

2. A method of automatically controlling water loss in a formation process of a start-stop AGM battery according to claim 1, characterized in that, In step S1, the battery before acid filling is weighed and the weight is recorded as M1; in step S2, the battery after acid filling is weighed and the weight is recorded as M2, when the difference between M2 and M1 meets the acid filling weight requirement, the AGM semi-finished battery is installed with a formation kettle for formation treatment, and when the difference between M2 and M1 does not meet the acid filling weight requirement, the AGM semi-finished battery is rejected.

3. A method of automatically controlling water loss in a formation process of a start-stop AGM battery according to claim 1, characterized in that, In step S2, the acid filled by the acid filling machine adopts a constant-temperature cold acid process, and the acid temperature is constant.

4. A method of automatically controlling water loss in a formation process of a start-stop AGM battery according to claim 1, characterized in that, In step S3, the standard temperature of the AGM semi-finished battery is set as 25℃ according to the standard charging and formation process, the standard temperature of the upper environment of the AGM semi-finished battery in the water bath is set as 25℃, the standard end-of-charge current of the battery is set as 7A, and the revised end-of-charge current N1 of the AGM battery to be measured is calculated, N1=(25-T1)*K1+(25-T2)*K2+7.

5. A method of automatically controlling water loss in a formation process of a start-stop AGM battery according to claim 4, characterized in that, In step S3, the coefficient K1 is 0.03-0.07, and the coefficient K2 is 0.08-0.12.

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