阅读说明：本技术 一种锌镍电池的修复方法 (Method for repairing zinc-nickel battery ) 是由 武占耀 许文 冯忠厚 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种锌镍电池的修复方法,包括：在第一条件下,对所述锌镍电池进行恒流充电,以使所述锌镍电池的电压充电至预设电压；当所述锌镍电池的电压充电至预设电压时,在第二条件下,对所述锌镍电池进行恒压充电,使得所述锌镍电池的充电电流降低至截止电流；在第三条件下,对所述锌镍电池进行恒流充电；在满足预设条件下,停止对所述锌镍电池进行充电；在第四条件下,将所述锌镍电池恒流放电至截止电压。如此,通过定期修复锌镍电池,提升锌镍电池的容量,同时,提高锌镍电池的容量利用率,延长锌镍电池使用寿命。(The invention discloses a method for repairing a zinc-nickel battery, which comprises the following steps: under a first condition, performing constant current charging on the zinc-nickel battery so as to charge the voltage of the zinc-nickel battery to a preset voltage; when the voltage of the zinc-nickel battery is charged to a preset voltage, carrying out constant voltage charging on the zinc-nickel battery under a second condition, so that the charging current of the zinc-nickel battery is reduced to a cut-off current; under a third condition, carrying out constant current charging on the zinc-nickel battery; stopping charging the zinc-nickel battery when a preset condition is met; and under a fourth condition, discharging the zinc-nickel battery to cut-off voltage in a constant current mode. Therefore, the capacity of the zinc-nickel battery is improved by periodically repairing the zinc-nickel battery, and meanwhile, the capacity utilization rate of the zinc-nickel battery is improved, and the service life of the zinc-nickel battery is prolonged.)

1. A method for repairing a zinc-nickel battery is characterized by comprising the following steps:

s1, under a first condition, constant current charging is carried out on the zinc-nickel battery, so that the voltage of the zinc-nickel battery is charged to a preset voltage;

s2, when the voltage of the zinc-nickel battery is charged to a preset voltage, under a second condition, the zinc-nickel battery is charged with a constant voltage, so that the charging current of the zinc-nickel battery is reduced to a cut-off current;

s3, under the third condition, carrying out constant current charging on the zinc-nickel battery;

s4, stopping charging the zinc-nickel battery when a preset condition is met;

and S5, under the fourth condition, discharging the zinc-nickel battery to a cut-off voltage in a constant current mode.

2. The method according to claim 1, wherein the charging time of the zinc-nickel battery is not more than 7 hours under the first condition and the second condition.

3. The method for repairing a zinc-nickel battery as claimed in claim 1, wherein the first condition is: a first initial current of 0.2C was used.

4. The method according to claim 3, wherein the predetermined voltage is set to 1.91V.

5. The method for repairing a zinc-nickel battery according to claim 4, wherein the second condition is: and adopting the preset voltage of 1.91V.

6. The method according to claim 5, wherein the off-current is set to 0.025C.

7. The method for repairing a zinc-nickel battery according to claim 6, wherein the third condition is: a second initial current of 0.1C was used.

8. The method for repairing a zinc-nickel battery according to claim 7, wherein the preset conditions are as follows: the charging time under the third condition reached 2 hours;

and/or, under the third condition, the voltage of the zinc-nickel battery reaches the upper limit voltage of 2.0V.

9. The method for repairing a zinc-nickel battery as claimed in claim 8, wherein the fourth condition is: a constant current of 0.2C was used.

10. The method according to claim 9, wherein the cut-off voltage is set to 1.1V.

Technical Field

The invention relates to the technical field of zinc-nickel batteries, in particular to a method for repairing a zinc-nickel battery.

Background

As is well known, the zinc-nickel battery has good application prospect in the fields of power tools and electric automobiles due to good low-temperature performance, high discharge power, low cost and higher specific energy as a novel secondary battery. However, in recent years, as the use of zinc-nickel secondary batteries in the fields of electric tools, electric vehicles, and starting power sources has become more widespread, higher demands have been made on the cycle life of zinc-nickel batteries.

Due to the difference of the charging efficiency of the positive electrode and the negative electrode, the thermodynamic instability of the zinc negative electrode in the electrolyte and the memory effect of the positive electrode plate, the charge and discharge capacity of the zinc-nickel battery is reduced in the using process, the normal use of the battery is influenced, and the service life of the zinc-nickel battery is shortened.

Therefore, how to design a repair method of a zinc-nickel battery is an urgent problem to be solved by the technical personnel in the field.

Disclosure of Invention

The invention provides a method for repairing a zinc-nickel battery, which can improve the capacity of the zinc-nickel battery by periodically repairing the zinc-nickel battery, improve the capacity utilization rate of the zinc-nickel battery and prolong the service life of the zinc-nickel battery.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

the embodiment of the invention provides a method for repairing a zinc-nickel battery, which comprises the following steps:

s1, under a first condition, constant current charging is carried out on the zinc-nickel battery, so that the voltage of the zinc-nickel battery is charged to a preset voltage;

s2, when the voltage of the zinc-nickel battery is charged to a preset voltage, under a second condition, the zinc-nickel battery is charged with a constant voltage, so that the charging current of the zinc-nickel battery is reduced to a cut-off current;

s3, under the third condition, carrying out constant current charging on the zinc-nickel battery;

s4, stopping charging the zinc-nickel battery when a preset condition is met;

and S5, under the fourth condition, discharging the zinc-nickel battery to a cut-off voltage in a constant current mode.

Alternatively, in an embodiment of the present invention, under the first condition and the second condition, the charging time of the zinc-nickel battery is not more than 7 hours.

Optionally, in an embodiment of the present invention, the first condition is: a first initial current of 0.2C was used.

Optionally, in an embodiment of the present invention, the preset voltage is set to 1.91V.

Optionally, in an embodiment of the present invention, the second condition is: and adopting the preset voltage of 1.91V.

Alternatively, in the embodiment of the present invention, the off current is set to 0.025C.

Optionally, in an embodiment of the present invention, the third condition is: a second initial current of 0.1C was used.

Optionally, in an embodiment of the present invention, the preset condition is: the charging time under the third condition reached 2 hours;

and/or, under the third condition, the voltage of the zinc-nickel battery reaches the upper limit voltage of 2.0V.

Optionally, in an embodiment of the present invention, the fourth condition is: a constant current of 0.2C was used.

Optionally, in the embodiment of the present invention, the cut-off voltage is set to 1.1V.

The invention has the advantages and positive effects that:

therefore, in the invention, the positive electrode capacity of the zinc-nickel battery is fully activated and recovered by adopting an overcharging mode, namely the current capacity of the zinc-nickel battery can be improved; in addition, the voltage of the zinc-nickel battery is limited to be less than the upper limit voltage of 2.0V and the charging time under the third condition is less than 2 hours, so that the overcharge can be controlled within 20% under the condition of ensuring that the positive electrode is fully activated, and unnecessary loss caused by overcharge can be reduced; in addition, when the zinc-nickel battery is discharged, the zinc-nickel battery is discharged to the cut-off voltage of 1.1V, so that the discharge depth of the zinc-nickel battery can be increased, and the influence caused by the memory effect is eliminated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a flow chart of a method for repairing a zinc-nickel battery provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:

the repairing method of the zinc-nickel battery provided by the invention, as shown in figure 1, comprises the following steps:

s1, under a first condition, constant current charging is carried out on the zinc-nickel battery, so that the voltage of the zinc-nickel battery is charged to a preset voltage;

s2, when the voltage of the zinc-nickel battery is charged to a preset voltage, under a second condition, the zinc-nickel battery is charged with a constant voltage, so that the charging current of the zinc-nickel battery is reduced to a cut-off current;

s3, under the third condition, carrying out constant current charging on the zinc-nickel battery;

s4, stopping charging the zinc-nickel battery when a preset condition is met;

and S5, under the fourth condition, discharging the zinc-nickel battery to a cut-off voltage in a constant current mode.

Therefore, in the invention, the positive electrode capacity of the zinc-nickel battery is fully activated and recovered by adopting an overcharging mode, namely the current capacity of the zinc-nickel battery can be improved; in addition, the voltage of the zinc-nickel battery is limited to be less than the upper limit voltage of 2.0V and the charging time under the third condition is less than 2 hours, so that the overcharge can be controlled within 20% under the condition of ensuring that the positive electrode is fully activated, and unnecessary loss caused by overcharge can be reduced; in addition, when the zinc-nickel battery is discharged, the zinc-nickel battery is discharged to the cut-off voltage of 1.1V, so that the discharge depth of the zinc-nickel battery can be increased, and the influence caused by the memory effect is eliminated.

Alternatively, in an embodiment of the present invention, under the first condition and the second condition, the charging time of the zinc-nickel battery is not more than 7 hours.

Optionally, in an embodiment of the present invention, the first condition is: a first initial current of 0.2C was used.

Optionally, in an embodiment of the present invention, the preset voltage is set to 1.91V.

Optionally, in an embodiment of the present invention, the second condition is: and adopting the preset voltage of 1.91V.

Specifically, the zinc-nickel battery is subjected to constant current charging by adopting a first initial current of 0.2C, so that the voltage of the zinc-nickel battery is gradually increased until the voltage is increased to a preset voltage of 1.91V, and the zinc-nickel battery is subjected to constant voltage charging by adopting the preset voltage of 1.91V.

Alternatively, in the embodiment of the present invention, the off current is set to 0.025C.

Optionally, in an embodiment of the present invention, the third condition is: a second initial current of 0.1C was used.

Optionally, in an embodiment of the present invention, the preset condition is: the charging time under the third condition reached 2 hours;

and/or, under the third condition, the voltage of the zinc-nickel battery reaches the upper limit voltage of 2.0V.

Among them, the reason why the zinc-nickel battery is overcharged is that:

after the zinc-nickel battery is used for many times, the total capacity of the zinc-nickel battery can be changed, namely the total capacity can be reduced; however, when the total capacity is reduced, both the charge width and the discharge width are reduced. However, since the zinc-nickel battery has a memory effect, the zinc-nickel battery can remember the conventional charge and discharge ranges, that is, the zinc-nickel battery remembers the reduced charge and discharge ranges.

Therefore, in the present invention, the overcharge of the zinc-nickel battery can fully activate and recover the positive electrode capacity of the zinc-nickel battery, in other words, the current capacity of the zinc-nickel battery can be increased, so that the capacity of the zinc-nickel battery can be partially or completely recovered.

Wherein, as long as one of the preset conditions is met, the zinc-nickel battery does not need to be charged.

And, the reason for setting the preset condition is: in order to prevent the overcharge of the zinc-nickel battery from being large, the overcharge of the zinc-nickel battery is controlled to be 20% at most.

For example, the current capacity of a zinc-nickel battery is 1C, and after the zinc-nickel battery is overcharged, the capacity of the zinc-nickel battery is not more than 1.2C, that is, the overcharge is controlled within 20%.

Therefore, the service life of the zinc-nickel battery is prolonged, and the power consumption is reduced.

Optionally, in an embodiment of the present invention, the fourth condition is: a constant current of 0.2C was used.

Optionally, in the embodiment of the present invention, the cut-off voltage is set to 1.1V.

In addition, when the zinc-nickel battery in the prior art is discharged, the zinc-nickel battery is discharged to 1.3V. The zinc-nickel battery has certain memory effect, so the zinc-nickel battery can memorize the discharge capacity range of 1.3V discharged in the past. In the invention, the zinc-nickel battery is discharged to 1.1V, so that the discharge depth of the zinc-nickel battery is increased, and the influence caused by the memory effect is eliminated.

A method for repairing a zinc-nickel battery will be described in detail below.

Firstly, constant current charging is carried out on a zinc-nickel battery by adopting a first initial current of 0.2C, so that the zinc-nickel battery is charged to a preset voltage of 1.91V; charging the zinc-nickel battery with a constant voltage of 1.91V to a cutoff current of 0.025C (which can be understood as a reduction from the first initial current of 0.2C to the cutoff current of 0.025C), wherein the total duration of the charging is not more than 7 hours;

then, charging the zinc-nickel battery by adopting a second initial current of 0.1C and a constant current;

when the charging time reaches 2 hours, stopping charging the zinc-nickel battery; or stopping charging the zinc-nickel battery when the voltage of the zinc-nickel battery reaches the upper limit voltage of 2.0V.

Finally, the zinc-nickel battery is discharged to the cut-off voltage of 1.1V by adopting the constant current of 0.2C.

As described above, the process of repairing the zinc-nickel battery for 1 time is performed, however, in order to ensure the accuracy of the repair, the zinc-nickel battery may be repaired for multiple times, for example, the zinc-nickel battery is repaired twice, which is not specifically limited herein, and the flexibility of the design is improved.

It should be noted that, referring to table 1, table 1 shows experimental data for repairing a zinc-nickel battery.

TABLE 1

The experimental object is a XNF 60-type battery, and the initial capacity is 57.104 Ah.

As can be seen from the contents of table 1, as the number of cycles increases, the corresponding discharge capacity decreases from 53.591Ah to 41.664Ah, and the capacity gradually decreases. Specifically, after 49 times of circulation, the discharge capacity is 53.591Ah, the capacity of the battery is obviously changed after the battery is repaired once, and the discharge capacity after the repair is 60.297Ah, so that the service life of the battery is prolonged.

And after the secondary repair of the battery, the discharge capacity has no obvious difference compared with the discharge capacity after the primary repair, which indicates that the repair of the battery is completed.

Therefore, in the invention, the positive electrode capacity of the zinc-nickel battery is fully activated and recovered by adopting an overcharging mode, namely the current capacity of the zinc-nickel battery can be improved; in addition, the voltage of the zinc-nickel battery is limited to be less than the upper limit voltage of 2.0V, and the charging time is less than 2 hours under the third condition, so that the phenomenon that the over-charge amount is large can be prevented, the over-charge amount is controlled within 20 percent, and unnecessary loss caused by over-charge can be reduced; in addition, when the zinc-nickel battery is discharged, the zinc-nickel battery is discharged to the cut-off voltage of 1.1V, so that the discharge depth of the zinc-nickel battery can be increased, and the influence caused by the memory effect is eliminated.

It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but other embodiments derived from the technical solutions of the present invention by those skilled in the art are also within the scope of the present invention.