Formation method for improving charging acceptance of storage battery

Abstract

The invention provides a formation method for improving the charge acceptance of a storage battery. The method sequentially comprises the following steps of: continuously charging in eleven steps and then discharging in one step; continuously charging in four steps and then discharging in one step; one step is discharged after two steps of continuous charging; carrying out three-step continuous charging; and detecting the volume and extracting acid. According to the method, longer infiltration time is adopted, it is ensured that electrolyte fully permeates into the thick polar plate, inner layer underformation is avoided, active substances in the polar plate can be fully formed, in addition, the method is convenient to operate, and a charging equipment program is set according to parameters of the method during operation.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and in particular relates to a formation method for improving the charge acceptance capability of a storage battery. Background Technology

[0002] Battery formation is the process by which active materials (such as lead dioxide on the positive electrode and spongy lead on the negative electrode) are actively generated on the plates for the first time through a specific charge and discharge procedure, forming a stable solid electrolyte interface film.

[0003] Battery charge acceptance capability refers to the core parameter of the amount of electricity a battery can receive per unit time under specified voltage and current conditions. It directly affects charging efficiency and battery life, and its performance is significantly affected by factors such as charging status, temperature, and battery type.

[0004] Once a battery is manufactured, its charge acceptance capability is a fixed parameter that will not change. Insufficient charge acceptance capability will negatively impact user experience and performance, so a method is needed to improve it. Summary of the Invention

[0005] To address the aforementioned technical problems, this application proposes a formation method to improve the charging acceptance capability of a battery. By refining the formation process in the charging process, the active materials inside the plates are fully formed, thereby improving the overall conversion rate of the active materials. The core objective is to generate a more robust, stable, and longer-lasting active material structure.

[0006] The specific technical solution is as follows: A formation method for improving the charge acceptance capability of a storage battery, the method comprising: Eleven steps of continuous charging followed by one step of discharging; Four steps of continuous charging followed by one step of discharging; Two consecutive charging steps are followed by one discharge step; Three-step continuous charging; Volume testing and acid extraction.

[0007] According to the formation method for improving the charge acceptance capability of a storage battery provided in this application, the eleven-step continuous charging includes: First, charge in five consecutive steps, then charge in six consecutive steps. During the five consecutive charging steps, the current increases from A1 to A2, and the time also increases. During the six-step charging process, the currents A2 and A3 alternate, with A3 being less than A2 and greater than A1.

[0008] According to the formation method for improving the charge acceptance capability of a battery provided in this application, the discharge current after eleven-step continuous charging is A4, and the current A4 is greater than A2.

[0009] According to the formation method for improving the charge acceptance capability of a battery provided in this application, the current A2 and A3 are alternated during the four-step continuous charging.

[0010] According to the formation method for improving the charge acceptance capability of a battery provided in this application, the discharge current after four consecutive charging steps is A4.

[0011] According to the formation method for improving the charge acceptance capability of a storage battery provided in this application, in the two-step continuous charging process, the battery is first charged with current A2 and then charged with current A3.

[0012] According to the formation method for improving the charge acceptance capability of a battery provided in this application, the discharge current after two consecutive charging steps is A5, and the current A5 is greater than A4.

[0013] According to the formation method for improving the charge acceptance capability of a battery provided in this application, the currents for the three consecutive charging steps are A6, A2, and A3, respectively.

[0014] The beneficial effects of this invention are as follows: The method of this invention employs a longer immersion time to ensure that the electrolyte fully penetrates into the interior of the thick electrode plate, avoiding "inner layer under-formation" and allowing the active materials inside the electrode plate to be fully formed. In addition, this method is easy to operate; the charging equipment program can be set according to the parameters of this method during operation. Attached Figure Description

[0015] Figure 1 The diagram shows a formation method for improving the charge acceptance capability of a battery. Detailed Implementation

[0016] In the following description, certain specific details are set forth in order to provide a thorough understanding of various embodiments. However, those skilled in the art will understand that the invention can be practiced without these details. In other instances, well-known structures have not been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments. Unless the context otherwise requires, throughout the specification and appended claims, the word "comprising" should be interpreted in an open-ended, inclusive sense, i.e., as "including but not limited to".

[0017] See Figure 1 This application provides a formation method for improving the charge acceptance capability of a storage battery. The process concept is as follows: Design the charging and discharging current for each stage of the corresponding battery model; Based on the formation process, calculate the charging capacity of each battery model and the charging capacity per unit mass of electrode paste. The established charging formation process is programmed into the charging equipment for operation.

[0018] In the formation method for improving the charge acceptance capability of a storage battery provided in this embodiment of the invention, the amount of dry paste per unit mass of electrode plates is a fixed value. This value can be appropriately adjusted according to the production climate temperature and the battery usage environment. The ratio is 0.65-0.70, and all models of the same series of batteries are controlled according to this value.

[0019] Based on the above approach, the formation process of this application embodiment includes the following steps: (1) Eleven consecutive charging steps followed by one discharge step; (2) Four consecutive charging steps followed by one discharging step; (3) Two consecutive charging steps followed by one discharging step; (4) Three-step continuous charging.

[0020] After step (4), the capacity testing stage and the acid extraction stage are carried out.

[0021] Example 1 This embodiment provides a battery model 3-EVF-200C.

[0022] The formation was carried out using the process parameters recorded in Table 1.

[0023] stage program Current / A Time / h 1 Charge 2.1 2.0 2 Charge 4.1 3.0 3 Charge 8.3 4.0 4 Charge 12.4 5.0 5 Charge 16.6 6.0 6 Charge 20.7 6.0 7 Charge 16.6 6.0 8 Charge 20.7 5.0 9 Charge 16.6 6.0 10 Charge 20.7 5.0 11 Charge 16.6 6.0 12 Discharge 21.5 1.0 13 Charge 20.7 6.0 14 Charge 16.6 7.0 15 Charge 20.7 6.0 16 Charge 16.6 7.0 17 Discharge 21.5 1.0 18 Charge 20.7 7.0 19 Charge 16.6 7.0 20 Discharge 48.3 4.0 21 Charge 41.4 5.0 22 Charge 20.7 9.0 23 Charge 16.6 7.0 24 Let stand 0.0 1.0 25 Discharge 41.5 4.0 26 Discharge 41.5 Converted voltage 27 Charge 41.5 5.0 28 Charge 31.3 1.0 29 Charge 20.0 5.0 30 Charge 2.8 2.0 31 Charge 2.8 2.0 Table 1 In Table 1, the corresponding currents A1 to A6 are 2.1, 16.6, 20.7, 21.5, 48.3, and 41.4, respectively.

[0024] Comparative Example 1 This embodiment provides a storage battery identical to that in Embodiment 1, and employs a formation process described in the prior art. The formation process parameters are shown in Table 2.

[0025] stage program Current / A Time / h 1 Charge 25.0 4 2 Charge 34.7 18 3 Discharge 25.0 1 4 Charge 34.7 18 5 Discharge 36.7 0.17 6 Charge 25.0 4 7 Discharge 60.0 2 8 Charge 34.7 8.5 9 Discharge 36.7 0.17 10 Charge 25.0 8 11 Discharge 20.0 0.17 12 Charge 12.7 8 13 Let stand 0.0 1 14 Discharge 41.5 4 15 Inspection 8.5V 16 Discharge 35.0 7 17 Inspection 20.0 4 18 Charge 0.0 0.5 19 Charge 2.8 2 20 Let stand 2.8 2 Table 2 In this invention, the charging acceptance capability of a battery is defined as: when the battery is recharged at a constant current, the battery voltage is when the recharge amount reaches 0.9C (C refers to the battery's rated capacity). When the battery voltage reaches 2.45V / cell, it indicates good charging acceptance capability. If the voltage does not reach 2.30V / cell, it indicates insufficient charging acceptance capability.

[0026] After the formation process, the battery in Example 1 has a charge acceptance capability of 2.46V / cell; while the battery in Comparative Example 1 has a charge acceptance capability of 2.27V / cell. As can be seen from the comparison, the formation process in this application uses a longer immersion time to ensure that the electrolyte fully penetrates into the thick electrode plate, avoiding "inner layer under-formation". This allows the active materials inside the electrode plate to be fully formed, thus improving the charge acceptance capability of the battery compared to the existing formation process.

[0027] Example 2 This embodiment provides a battery model 3-EVF-225B.

[0028] The formation was carried out using the process parameters recorded in Table 3.

[0029] stage program Current / A Time / h 1 Charge 2.3 2.0 2 Charge 4.5 3.0 3 Charge 9.0 4.0 4 Charge 13.5 5.0 5 Charge 18.0 6.0 6 Charge 22.5 6.0 7 Charge 18.0 6.0 8 Charge 22.5 5.0 9 Charge 18.0 6.0 10 Charge 22.5 5.0 11 Charge 18.0 6.0 12 Discharge 23.4 1.0 13 Charge 22.5 6.0 14 Charge 18.0 7.0 15 Charge 22.5 6.0 16 Charge 18.0 7.0 17 Discharge 23.4 1.0 18 Charge 22.5 7.0 19 Charge 18.0 7.0 20 Discharge 52.5 4.0 21 Charge 45.0 5.0 22 Charge 22.5 9.0 23 Charge 18.0 7.0 24 Let stand 0.0 1.0 25 Discharge 46.8 4.0 26 Discharge 46.8 Converted voltage 27 Charge 46.8 5.0 28 Charge 35.1 1.0 29 Charge 22.5 5.0 30 Charge 3.1 2.0 31 Charge 3.1 2.0 Table 3 In Table 1, the corresponding currents A1 to A6 are 2.3, 18.0, 22.5, 23.4, 52.5, and 45.0 respectively.

[0030] Comparative Example 2 This embodiment provides a battery identical to that in Embodiment 2, and employs a formation process described in the prior art. The formation process parameters are shown in Table 4.

[0031] stage program Current / A Time / h 1 Charge 28.1 4 2 Charge 39.0 18 3 Discharge 28.1 1 4 Charge 39.0 18 5 Discharge 41.3 0.17 6 Charge 28.1 4 7 Discharge 60.0 2.5 8 Charge 39.0 8.5 9 Discharge 41.3 0.17 10 Charge 28.1 8 11 Discharge 22.5 0.17 12 Charge 14.3 8 13 Let stand 0.0 1 14 Discharge 46.8 4 15 Inspection 46.8 8.5V 16 Discharge 39.4 7 17 Inspection 22.5 4 18 Charge 0.0 0.5 19 Charge 3.1 2 20 Let stand 3.1 2 Table 4 After the formation process, the battery in Example 2 has a charge acceptance capability of 2.46V / cell; while the battery in Comparative Example 2 has a charge acceptance capability of 2.26V / cell. As can be seen from the comparison, the formation process in this application uses a longer immersion time to ensure that the electrolyte fully penetrates into the thick electrode plate, avoiding "inner layer under-formation". This allows the active materials inside the electrode plate to be fully formed, thus improving the charge acceptance capability of the battery compared to the existing formation process.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A formation method for improving the charge acceptance capability of a storage battery, characterized in that, The method includes, in sequence: Eleven steps of continuous charging followed by one step of discharging; Four steps of continuous charging followed by one step of discharging; Two consecutive charging steps are followed by one discharge step. Three-step continuous charging; Volume testing and acid extraction.

2. The formation method for improving the charge acceptance capability of a storage battery according to claim 1, characterized in that, Eleven-step continuous charging includes: First, charge in five consecutive steps, then charge in six consecutive steps. During the five consecutive charging steps, the current increases from A1 to A2, and the time also increases. During the six-step charging process, the currents A2 and A3 alternate, with A3 being less than A2 and greater than A1.

3. The formation method for improving the charge acceptance capability of a storage battery according to claim 2, characterized in that, The discharge current after eleven consecutive charging steps is A4, and current A4 is greater than A2.

4. The formation method for improving the charge acceptance capability of a storage battery according to claim 3, characterized in that, During the four-step continuous charging process, the currents A2 and A3 alternate.

5. The formation method for improving the charge acceptance capability of a storage battery according to claim 4, characterized in that, The discharge current after four consecutive charging steps is A4.

6. The formation method for improving the charge acceptance capability of a storage battery according to claim 5, characterized in that, During two-step continuous charging, the device is first charged with current A2, and then charged with current A3.

7. The formation method for improving the charge acceptance capability of a storage battery according to claim 6, characterized in that, The discharge current after two consecutive charging steps is A5, and A5 is greater than A4.

8. The formation method for improving the charge acceptance capability of a storage battery according to claim 7, characterized in that, The currents for the three consecutive charging steps are A6, A2, and A3, respectively.

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