Step charging method of zinc-nickel battery

Abstract

The invention provides a cascade charging method for a zinc-nickel battery, which comprises the following steps: S1, carrying out constant-current charging on the zinc-nickel battery by adopting an initial current, 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, reducing cascade data on the basis of the initial current until the initial current is reduced to a cut-off current; s3, carrying out constant-current charging on the zinc-nickel battery by adopting the cut-off current; and S4, stopping charging the zinc-nickel battery when a preset condition is met. According to the invention, the zinc-nickel battery is charged in a constant-current step voltage limiting manner, so that the requirement design for the charger is simplified, and the cost of the charger can be reduced; the zinc-nickel battery is charged by controlling the charging voltage and the cut-off current, so that the charging amount of the zinc-nickel battery can be ensured, overcharging of the zinc-nickel battery can be avoided, and the service life of the zinc-nickel battery is prolonged.

Description

[0001] This application is a divisional application of a patent application entitled "A step-by-step charging method for zinc-nickel batteries". The application date of the original application is August 5, 2021, and the application number is 202110896175.5. Technical Field

[0002] The invention relates to the technical field of zinc-nickel batteries, in particular to a step-charging method for zinc-nickel batteries. Background Art

[0003] With the progress of society and the enhancement of environmental awareness, electric vehicles are gradually gaining popularity because they are powered by on-board power and can solve the problems of exhaust emissions from fuel vehicles, environmental pollution, and high energy consumption. The charging problem of electric vehicles is a problem that people are very concerned about, which is related to the popularization and promotion of electric vehicles.

[0004] In the prior art, the charging method of zinc-nickel batteries generally adopts the method of constant current to constant voltage. However, this method has high requirements on the charger, complex circuits and high costs.

[0005] Based on this, how to design a cascade charging method for zinc-nickel batteries is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] The present invention provides a zinc-nickel battery step-charging method, which adopts a constant current step-by-step voltage limiting method to charge the zinc-nickel battery, which not only simplifies the design requirements for the charger, but also reduces the cost of the charger.

[0007] The present invention solves the technical problem by adopting the following technical solutions:

[0008] The present invention provides a step-by-step charging method for a zinc-nickel battery, comprising:

[0009] S1, using an initial current to perform constant current charging on the zinc-nickel battery so that the voltage of the zinc-nickel battery is charged to a preset voltage;

[0010] S2. When the voltage of the zinc-nickel battery is charged to a preset voltage, the step data is reduced on the basis of the initial current until the initial current is reduced to a cut-off current;

[0011] S3, using the cut-off current to perform constant current charging on the zinc-nickel battery;

[0012] S4. When a preset condition is met, stopping charging the zinc-nickel battery;

[0013] The preset conditions are: the charging voltage of the zinc-nickel battery reaches the preset voltage; the initial current is set to 0.2C-1C; the preset voltage is set to 1.90V-1.91V; the step data is set to 5%-50%; and the cut-off current is set to 0.025C-0.05C.

[0014] The advantages and positive effects of the present invention are:

[0015] Thus, in the present invention, the zinc-nickel battery is charged by adopting the constant current step voltage limiting method, which not only simplifies the design requirements for the charger, but also reduces the cost of the charger; and, by charging the zinc-nickel battery by controlling the charging voltage and cut-off current of the zinc-nickel battery, the charging amount of the zinc-nickel battery can be guaranteed and the overcharging of the zinc-nickel battery can be avoided, thus being beneficial to prolonging the service life of the zinc-nickel battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 The present invention provides a flow chart of a zinc-nickel battery step-charging method. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The present invention proposes a step-by-step charging method for a zinc-nickel battery, such as Figure 1 As shown, including:

[0021] S1, using an initial current to perform constant current charging on the zinc-nickel battery so that the voltage of the zinc-nickel battery is charged to a preset voltage;

[0022] S2. When the voltage of the zinc-nickel battery is charged to a preset voltage, the step data is reduced on the basis of the initial current until the initial current is reduced to a cut-off current;

[0023] S3, using the cut-off current to perform constant current charging on the zinc-nickel battery;

[0024] S4. When a preset condition is met, stop charging the zinc-nickel battery.

[0025] Thus, in the present invention, the zinc-nickel battery is charged by adopting the constant current step voltage limiting method, which not only simplifies the design requirements for the charger, but also reduces the cost of the charger; and, by charging the zinc-nickel battery by controlling the charging voltage and cut-off current of the zinc-nickel battery, the charging amount of the zinc-nickel battery can be guaranteed and the overcharging of the zinc-nickel battery can be avoided, thus being beneficial to prolonging the service life of the zinc-nickel battery.

[0026] The calculation of the step data may be specifically referred to Tables 1 to 6.

[0027] Optionally, in an embodiment of the present invention, the preset condition is: the charging voltage of the zinc-nickel battery reaches the preset voltage.

[0028] It should be noted that, with 25°C as the reference, the temperature compensation coefficient of the preset voltage is -3.5mv / °C for every 1°C change in temperature.

[0029] Optionally, in an embodiment of the present invention, the initial current is set to 0.2C-1C.

[0030] Optionally, in an embodiment of the present invention, the preset voltage is set to 1.90V-1.91V.

[0031] Optionally, in the embodiment of the present invention, the step data is set to 5%-50%.

[0032] In this way, the specific value of the ladder data can be selected according to the actual situation, and no specific limitation is made here, thereby improving the flexibility of the design to meet the needs of different scenarios.

[0033] Optionally, in an embodiment of the present invention, the cut-off current is set to 0.025C-0.05C.

[0034] In this way, the zinc-nickel battery is charged with the last stage of constant current using the cut-off current, which can ensure that the zinc-nickel battery is fully charged.

[0035] A step-by-step charging method for a zinc-nickel battery is described below with reference to a specific embodiment.

[0036] It should be noted in advance that the model of the zinc-nickel battery in Examples 1 to 7 is XNF120.

[0037] Example 1: The step data is the charging experimental data of the zinc-nickel battery with a charge rate of 30%, as shown in Table 1.

[0038] Table 1

[0039]

[0040]

[0041] Example 2: The step data is the charging experimental data of the zinc-nickel battery with a charge rate of 20%, as shown in Table 2.

[0042] Table 2

[0043]

[0044]

[0045] Example 3: The charging experimental data of the zinc-nickel battery with a step data of 10% is shown in Table 3.

[0046] Table 3

[0047]

[0048]

[0049] Among them, the first embodiment, the second embodiment and the third embodiment are respectively charging experiment data structures of zinc-nickel batteries with different levels of data.

[0050] The cumulative capacity of Example 1 is 124.21Ah, and the discharge capacity is 123.37Ah;

[0051] The cumulative capacity of Example 2 is 123.89Ah, and the discharge capacity is 123.22Ah;

[0052] The cumulative capacity of Example 3 is 124.9Ah, and the discharge capacity is 123.7Ah;

[0053] By comparison, it can be seen that the corresponding cumulative capacity of the zinc-nickel batteries with different level data is about 124Ah, and the corresponding discharge capacity is about 123Ah. Among them, there is no significant difference between the three groups of data. Therefore, it is shown that the charging method of the present invention can charge the zinc-nickel battery of model XNF120.

[0054] Example 4: The charging experimental data of the zinc-nickel battery with an initial current of 0.2C is shown in Table 4.

[0055] Table 4

[0056]

[0057] Example 5: The charging experimental data of the zinc-nickel battery with an initial current of 0.33C is shown in Table 5.

[0058] Table 5

[0059]

[0060]

[0061] Example 6: The charging experimental data of the zinc-nickel battery with an initial current of 1C is shown in Table 6.

[0062] Table 6

[0063]

[0064]

[0065] Among them, the fourth embodiment, the fifth embodiment, and the sixth embodiment are respectively charging experimental data structures of zinc-nickel batteries with different initial currents.

[0066] The cumulative capacity of Example 4 is 124.24Ah, and the discharge capacity is 123.33Ah;

[0067] The cumulative capacity of Example 5 is 123.741Ah, and the discharge capacity is 122.963Ah;

[0068] The cumulative capacity of Example 6 is 123.52Ah, and the discharge capacity is 123.44Ah;

[0069] By comparison, it can be seen that the corresponding cumulative capacity of the zinc-nickel batteries with different initial currents is about 124Ah, and the corresponding discharge capacity is about 123Ah. There is no significant difference between the three groups of data. Therefore, it is shown that the charging method of the present invention can charge the zinc-nickel battery of model XNF120.

[0070] Embodiment 7: An example is given with an initial current of 0.5C, a cut-off current of 0.025C, a preset voltage of 1.91V and a step data of 30%.

[0071] Among them, 0.5C corresponds to 60A, and 0.025C corresponds to 6A. For details, please refer to Table 1.

[0072] The zinc-nickel battery is charged with a constant current of 60A to a preset voltage of 1.91V.

[0073] When the zinc-nickel battery reaches a preset voltage of 1.91V, the step data is reduced by 30% based on the initial current of 60A. Specifically, for the initial current of 60A, according to the step data of 30%, 18A is reduced for the first time, and 42A remains, and the calculation is continued in this way until the initial current of 60A is reduced to the cut-off current of 6A;

[0074] The zinc-nickel battery is charged with a constant current using a cut-off current of 6A;

[0075] When the voltage of the zinc-nickel battery reaches a preset voltage of 1.91V, charging of the zinc-nickel battery is stopped.

[0076] Thus, in the present invention, the zinc-nickel battery is charged by adopting the constant current step voltage limiting method, which not only simplifies the design requirements for the charger, but also reduces the cost of the charger; and, by charging the zinc-nickel battery by controlling the charging voltage and cut-off current of the zinc-nickel battery, the charging amount of the zinc-nickel battery can be guaranteed and the overcharging of the zinc-nickel battery can be avoided, thus being beneficial to prolonging the service life of the zinc-nickel battery.

[0077] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0078] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A step-charging method for a zinc-nickel battery, characterized in that: include: S1, using an initial current to perform constant current charging 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, the step data is reduced on the basis of the initial current until the initial current is reduced to a cut-off current; S3, using the cut-off current to perform constant current charging on the zinc-nickel battery; S4. When a preset condition is met, stopping charging the zinc-nickel battery; The preset conditions are: the charging voltage of the zinc-nickel battery reaches the preset voltage; the initial current is set to 0.2C-1C; the preset voltage is set to 1.90V-1.91V; the step data is set to 5%-50%; and the cut-off current is set to 0.025C-0.05C.

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