Charging control method of super-capacitor spot welding machine and computer readable storage medium

Abstract

The invention relates to the field of super-capacitor spot welding machines, in particular to a charging control method for a super-capacitor spot welding machine. The invention provides a charging control method for a super-capacitor spot welding machine. The charging control method comprises the following steps that whether the spot welding machine is in a charging state or not is judged; when in the charging state, judging whether in a working state or not; when in a non-working state, the charging of the super capacitor is stopped; in the working state, reading the total voltage Vtot of the energy storage module; judging whether the total voltage Vtot is greater than a first set voltage value Vset1 or not; when the total voltage Vtot is greater than a first set voltage value Vset1, stopping charging the super capacitor; and when the total voltage Vtot is not greater than the first set voltage value Vset1, charging the super capacitor. The invention aims to solve the technical problem that the service life of a capacitor is influenced due to the fact that an existing super-capacitor spot welding machine is in a full charge state for a long time during charging.

Description

Technical Field

[0001] The invention relates to the field of supercapacitor spot welders, and in particular to a charging control method for a supercapacitor spot welder. Background Art

[0002] Supercapacitors are electrochemical components that store energy through polarized electrolytes. Supercapacitors are increasingly being used in spot welders due to their high power density, fast charge and discharge speed, long service life, and wide operating temperature range. Supercapacitor spot welders are devices that use supercapacitors to store electrical energy and release it in a short time for welding. Compared with traditional spot welders, supercapacitor spot welders have the advantages of high current, short welding time, high energy density, strong stability, and better welding quality.

[0003] During the spot welding process, the capacitor will quickly release the stored energy, generating high temperatures to weld the metal materials together. In order to ensure that the next welding operation can proceed smoothly, the capacitor needs to be charged immediately after each welding to restore its energy reserves. This requires the supercapacitor spot welder to maintain the spot state for a long time. However, long-term full charge, especially in a high temperature environment or with poor charging facilities, may cause the performance of the supercapacitor to deteriorate faster. This is because the full charge state means that the chemical reaction inside the capacitor is in a highly excited state, and maintaining this state for a long time may cause irreversible damage to the electrode material.

[0004] In view of this, it is necessary to propose a charging control method for a supercapacitor spot welding machine to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a charging control method for a supercapacitor spot welder. The present invention aims to solve the technical problem that the supercapacitor spot welder is in a fully charged state for a long time during charging, which affects the service life of the capacitor.

[0006] In order to achieve the above object, the present invention provides a charging control method for a supercapacitor spot welder, which is used for a charging circuit of a supercapacitor spot welder, wherein the charging circuit comprises an input module, a switch module, an energy storage module, an output module electrically connected in sequence, and a control module electrically connected to the input module, the switch module, the energy storage module, and the output module respectively, wherein the energy storage module comprises n supercapacitors C1, C2, C3, ... C connected in series with each other. i ...C n , i=1, 2, 3, ... n, the charging control method comprises the following steps:

[0007] Determine whether the spot welder is in charging state;

[0008] When the spot welder is in a charging state, determining whether the spot welder is in a working state;

[0009] When the spot welder is in a non-working state, the control module controls the switch module to stop charging the supercapacitor.

[0010] Further, after the step of determining whether the spot welder is in a working state when the spot welder is in a charging state, the method further includes:

[0011] When the spot welder is in working state, read the total voltage V of the energy storage module tot ;

[0012] Determine the total voltage V tot Is it greater than the first set voltage value V set1 ;

[0013] When the total voltage V tot is greater than the first set voltage value V set1 When , the control module controls the switch module to stop charging the supercapacitor;

[0014] When the total voltage V tot Not greater than the first set voltage value V set1 When the super capacitor is charged, the control module controls the switch module to charge the super capacitor.

[0015] Furthermore, the first set voltage value V set1 =V 标称 ×n×α, where V 标称 is the nominal voltage of the supercapacitor, n is the number of supercapacitors, α is a constant, and 85%≤α≤98%.

[0016] Furthermore, when the total voltage V tot Not greater than the first set voltage value V set1 When the control module controls the switch module to charge the super capacitor, the step includes:

[0017] Read the voltage V1 of supercapacitor C1, the voltage V2 of supercapacitor C2, the voltage V3 of supercapacitor C3, ...supercapacitor C n Voltage V n , and read the maximum value V max and minimum value V min ;

[0018] Calculate the maximum voltage difference V of the capacitor e =V max -V min ;

[0019] Determine the maximum voltage difference V of the capacitor e Is it greater than the second set voltage value V set2 ;

[0020] When the capacitor has the maximum voltage difference V e Greater than the second set voltage value V set2 When the control module controls the switch module to stop charging the super capacitor.

[0021] Further, in determining the maximum voltage difference V of the capacitor e Is it greater than the second set voltage value V set2 The steps that follow include:

[0022] When the capacitor has the maximum voltage difference V e Greater than the second set voltage value V set2 When the super capacitor is charged, the control module controls the switch module to charge the super capacitor.

[0023] Furthermore, the first set voltage value V set2 =V 标称 ×β, where V 标称 is the nominal voltage of the supercapacitor, β is a constant, and 10%≤β≤15%.

[0024] The present invention also provides a computer-readable storage medium, which stores a computer program. The computer-readable storage medium stores a computer program. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the charging control method as described above are implemented.

[0025] The charging control method of the supercapacitor spot welder of the present application is used for the charging circuit of the supercapacitor spot welder, wherein the charging circuit comprises an input module, a switch module, an energy storage module, an output module electrically connected in sequence, and a control module electrically connected to the input module, the switch module, the energy storage module, and the output module respectively. The energy storage module comprises n supercapacitors C1, C2, C3...C connected in series with each other. i ...C n , i=1, 2, 3, ...n. The charging control method determines whether the spot welder is in a working state, thereby regulating the control module to control the switch module to charge the supercapacitor. If the spot welder is in a non-working state, the control module controls the switch module to stop charging the supercapacitor, so as to reduce the number of cycles in which the supercapacitor participates, and avoid the supercapacitor being in a charging state for a long time in a non-working state, thereby increasing the service life of the supercapacitor. The present invention effectively solves the technical problem that the current supercapacitor spot welder is in a fully charged state for a long time during charging, which affects the service life of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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 or the description of the prior art 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 the structures shown in these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a charging circuit of a supercapacitor spot welding machine according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the structure of an energy storage module according to an embodiment of the present invention

[0029] Figure 3 A schematic flow chart of a charging control method for a supercapacitor spot welding machine according to an embodiment of the present invention;

[0030] Figure 4 A schematic flow chart of a charging control method for a supercapacitor spot welding machine according to another embodiment of the present invention;

[0031] Figure 5 A schematic flow chart of a charging control method for a supercapacitor spot welding machine according to another embodiment of the present invention;

[0032] Figure 6 It is a line graph of the life test of the supercapacitor at different temperatures and voltages according to an embodiment of the present invention.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0034] Description of Figure Numbers:

[0035] 100-input module, 200-switch module, 300-energy storage module, 400-output module, 500-control module. DETAILED DESCRIPTION

[0036] 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 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.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Please refer to Figure 1 and Figure 2 The present invention provides a charging control method for a supercapacitor spot welder, which is used for a charging circuit of the supercapacitor spot welder. The charging circuit includes an input module 100, a switch module 200, an energy storage module 300, and an output module 400 which are electrically connected in sequence, and a control module 500 which is electrically connected to the input module 100, the switch module 200, the energy storage module 300, and the output module 400 respectively. The energy storage module 300 includes n supercapacitors C1, C2, C3, ... C connected in series. i ...C n , i=1,2,3,...n.

[0039] Please refer to Figure 3 As a specific embodiment of the present invention, a charging control method for a supercapacitor spot welding machine provided by the present invention comprises the following steps:

[0040] Determine whether the spot welder is in charging state;

[0041] When the spot welder is in a charging state, determine whether the spot welder is in a working state.

[0042] The charging control method of the supercapacitor spot welder of the present application is used for the charging circuit of the supercapacitor spot welder, and the charging circuit includes an input module 100, a switch module 200, an energy storage module 300, an output module 400 electrically connected in sequence, and a control module 500 electrically connected to the input module 100, the switch module 200, the energy storage module 300, and the output module 400 respectively. Among them, the energy storage module 300 includes n supercapacitors C1, C2, C3...C connected in series with each other. i ...C n , i=1, 2, 3, ... n. The charging control method provided in the present application determines whether the spot welder is in a working state, thereby regulating the control module 500 to control the switch module 200 to charge the supercapacitor. If the spot welder is in a non-working state, the control module 500 controls the switch module 200 to stop charging the supercapacitor, so as to reduce the number of cycles in which the supercapacitor participates, avoid the supercapacitor being in a charging state for a long time in a non-working state, and thus increase the service life of the supercapacitor.

[0043] Please refer to Figure 4As a preferred embodiment of the present invention, when the spot welder is in a non-working state, the control module 500 controls the switch module 200 to stop charging the supercapacitor;

[0044] When the spot welder is in working state, read the total voltage V of the energy storage module 300. tot ;

[0045] Determine the total voltage V tot Is it greater than the first set voltage value V set1 ;

[0046] When the total voltage V tot Greater than the first set voltage value V set1 When , the control module 500 controls the switch module 200 to stop charging the supercapacitor;

[0047] When the total voltage V tot Not greater than the first set voltage value V set1 When the power is on, the control module 500 controls the switch module 200 to charge the super capacitor.

[0048] Among them, the first set voltage value V set1 =V 标称 ×n×α, where V 标称 is the nominal voltage of the supercapacitor, n is the number of supercapacitors, α is a constant, and 85%≤α≤98%.

[0049] It should be noted that under normal circumstances, there are three main factors that affect the life of supercapacitors, namely ambient temperature, ripple current, and actual applied voltage. The actual service life of supercapacitors can be calculated using formula (1):

[0050] L=L0×K T ×K V ×K R (1)

[0051] Where, L: actual service life of capacitor

[0052] L0: Life of capacitor under rated conditions

[0053] K T : Capacitor temperature coefficient

[0054] K V : Capacitor voltage coefficient

[0055] K R : Capacitor ripple current coefficient

[0056] Specifically, according to the Arrhenius equation, as the temperature rises, the chemical reaction rate (life consumption) increases. Generally speaking, for every 10°C increase in ambient temperature, the chemical reaction rate will increase by 2 to 10 times, that is, for every 10°C increase in the operating temperature of the capacitor, the capacitor life will be halved, and for every 10°C decrease in the operating temperature of the capacitor, its life will be doubled. In summary, Where T0 is the rated temperature of the capacitor and T is the operating environment temperature of the capacitor.

[0057] Capacitor voltage coefficient K V It refers to the characteristic that the capacitance of a capacitor changes with the applied voltage. Among them, U0 is the rated working voltage, U is the actual working voltage, and ζ is the working voltage influencing factor, which depends on the product design and the specific situation of the manufacturer.

[0058] In actual working conditions, the supercapacitor ripple current coefficient K R Calculated by formula (2):

[0059]

[0060] in, I0 is the rated ripple current, I is the actual ripple current, and ΔT0 is the allowable temperature rise at the center of the capacitor at the rated temperature.

[0061] According to formula (1), under the same ambient temperature and ripple current conditions, the actual working voltage is positively correlated with the service life of the capacitor. Therefore, reducing the working voltage of the capacitor within a certain range can extend the service life of the capacitor.

[0062] Please refer to Figure 6 Specifically, in this embodiment, Table 1 shows the life test data of a supercapacitor of model BCAP0350 (rated voltage: 2.5V, operating temperature: -40℃~60℃, life: 1500h at 65℃) under different operating voltages in environments of 25℃, 40℃, 50℃ and 65℃.

[0063] Table 1 BCAP0350 life at different temperatures and voltages (h)

[0064]

[0065]

[0066] The test results show that when the operating temperature of the supercapacitor BCAP0350 exceeds 25°C and the actual operating voltage exceeds 2.1V, within a certain range, as the voltage and operating temperature increase, the life of the supercapacitor will decay. This is mainly because temperature and voltage will affect the conductivity of the electrolyte, the decomposition of the electrolyte, etc. Within the rated operating range of the super voltage, the closer the temperature is to the boiling point of the electrolyte, and the closer the voltage is to the decomposition voltage of the electrolyte, the shorter its service life. When the ambient temperature and the actual operating voltage exceed the rated operating range, the supercapacitor may be damaged due to the accumulation of internal pressure. Furthermore, it can be concluded from the data in Table 1 that when the actual operating voltage is higher than 2.3V, the life is halved every time the actual operating voltage increases by 0.1V.

[0067] On the one hand, as shown in Table 1, when the actual working voltage is lower than a certain level, 2.3V at 25°C and 2.2V at 35°C, the service life of the supercapacitor will not increase. Normally, the working environment temperature of the supercapacitor spot welder is 35°C to 40°C, so the minimum value of α is 85%. On the other hand, when the actual working voltage of the supercapacitor is too low, it will affect the spot welding effect of the spot welder. On the contrary, the closer the actual working voltage of the supercapacitor is to the rated voltage, the better the spot welding effect of the spot welder. Specifically, in this embodiment, α=92%, 95%, 96% or 98%.

[0068] The charging control method of the supercapacitor spot welder of the present application, on the one hand, the charging control method provided by the present application determines whether the spot welder is in working state, thereby regulating the control module 500 to control the switch module 200 to charge the supercapacitor. If the spot welder is in non-working state, the control module 500 controls the switch module 200 to stop charging the supercapacitor to reduce the number of times the supercapacitor participates in the cycle, avoids the supercapacitor being in a charging state for a long time in the non-working state, and thus increases the service life of the supercapacitor. On the other hand, the charging control method increases voltage management, specifically, when the spot welder is in working state, reads the total voltage V of the energy storage module 300 tot And determine the total voltage V tot Is it greater than the first set voltage value V set1 The regulation control module 500 controls the switch module 200 to charge the supercapacitor. tot Greater than the first set voltage value V set1 When the supercapacitor is fully charged, the control module 500 controls the switch module 200 to stop charging the supercapacitor, that is, the supercapacitor is not fully charged even when charging without affecting the welding effect, thereby further increasing the service life of the supercapacitor. The present invention effectively solves the technical problem that the supercapacitor spot welding machine is in a fully charged state for a long time during charging, which affects the service life of the capacitor.

[0069] Please refer to Figure 5 As another preferred embodiment of the present invention, a charging control method for a supercapacitor spot welding machine provided by the present invention comprises the following steps:

[0070] Determine whether the spot welder is in charging state;

[0071] When the spot welder is in charging state, determine whether the spot welder is in working state;

[0072] When the spot welder is in a non-operating state, the control module 500 controls the switch module 200 to stop charging the supercapacitor;

[0073] When the spot welder is in working state, read the total voltage V of the energy storage module 300. tot ;

[0074] Determine the total voltage V tot Is it greater than the first set voltage value V set1 ; Among them, the first set voltage value V set1 =V 标称 ×n×α, where V 标称 is the nominal voltage of the supercapacitor, n is the number of supercapacitors, α is a constant, and 85%≤α≤98%.

[0075] When the total voltage V tot Greater than the first set voltage value V set1 When , the control module 500 controls the switch module 200 to stop charging the supercapacitor;

[0076] When the total voltage V tot Not greater than the first set voltage value V set1 When reading the voltage V1 of supercapacitor C1, the voltage V2 of supercapacitor C2, the voltage V3 of supercapacitor C3, ... the voltage V1 of supercapacitor C n Voltage V n , and read the maximum value V max and minimum value V min ;

[0077] Calculate the maximum voltage difference V of the capacitor e =V max -V min ;

[0078] Determine the maximum voltage difference V of the capacitor e Is it greater than the second set voltage value V set2 ; Among them, the first set voltage value V set2 =V 标称 ×β, where V 标称 is the nominal voltage of the supercapacitor, β is a constant, and 10%≤β≤15%.

[0079] When the maximum voltage difference of capacitor V e Greater than the second set voltage value V set2 When , the control module 500 controls the switch module 200 to stop charging the supercapacitor.

[0080] When the maximum voltage difference of capacitor V e Greater than the second set voltage value V set2 When the power is on, the control module 500 controls the switch module 200 to charge the super capacitor.

[0081] Among them, the maximum voltage V of n supercapacitors in series is max The difference between the minimum voltage and V min The calculated maximum voltage difference between capacitors V e is the maximum voltage fluctuation range of n supercapacitors connected in series. e Greater than the second set voltage value V set2 When β is too large, it means that the maximum voltage fluctuation range of the n supercapacitors in series exceeds the predetermined value, which may mean that one or more supercapacitor values ​​are abnormal. When the value of β is too large, it is impossible to detect the abnormal situation of the supercapacitors in series. Since the supercapacitors in series will have certain voltage fluctuations, if the value of β is too small, it is easy to misjudge normal voltage fluctuations as abnormal fluctuations. Therefore, β is set to 10% to 15%. Specifically, in this embodiment, β = 10% or 15%.

[0082] The present invention also provides a computer-readable storage medium, which stores a computer program. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the charging control method as described above are implemented.

[0083] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

[0084] When executed by the processor, the above-mentioned helmet box control method is implemented, so all embodiments of the above-mentioned method are applicable to the computer-readable storage medium and can achieve the same or similar beneficial effects.

[0085] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A charging control method for a supercapacitor spot welder, which is used for a charging circuit of a supercapacitor spot welder, wherein the charging circuit comprises an input module, a switch module, an energy storage module, an output module which are electrically connected in sequence, and a control module which is electrically connected to the input module, the switch module, the energy storage module, and the output module respectively, characterized in that: The energy storage module includes n supercapacitors C1, C2, C3, ..., connected in series. i ...C n , i=1, 2, 3, ... n, the charging control method comprises the following steps: Determine whether the spot welder is in charging state; When the spot welder is in a charging state, determining whether the spot welder is in a working state; When the spot welder is in a non-working state, the control module controls the switch module to stop charging the supercapacitor.

2. The charging control method according to claim 1, characterized in that: After the step of determining whether the spot welder is in a working state when the spot welder is in a charging state, the step further includes: When the spot welder is in working state, read the total voltage V of the energy storage module tot ; Determine the total voltage V tot Is it greater than the first set voltage value V set1 ; When the total voltage V tot is greater than the first set voltage value V set1 When , the control module controls the switch module to stop charging the supercapacitor; When the total voltage V tot Not greater than the first set voltage value V set1 When the super capacitor is charged, the control module controls the switch module to charge the super capacitor.

3. The charging control method according to claim 2, characterized in that: The first set voltage value V set1 =V 标称 ×n×α, where V 标称 is the nominal voltage of the supercapacitor, n is the number of supercapacitors, α is a constant, and 85%≤α≤98%.

4. The charging control method according to claim 2, characterized in that: When the total voltage V tot Not greater than the first set voltage value V set1 When the control module controls the switch module to charge the super capacitor, the step includes: Read the voltage V1 of supercapacitor C1, the voltage V2 of supercapacitor C2, the voltage V3 of supercapacitor C3, ...supercapacitor C n Voltage V n , and read the maximum value V max and minimum value V min ; Calculate the maximum voltage difference V of the capacitor e =V max -V min ; Determine the maximum voltage difference V of the capacitor e Is it greater than the second set voltage value V set2 ; When the capacitor has the maximum voltage difference V e Greater than the second set voltage value V set2 When the control module controls the switch module to stop charging the super capacitor.

5. The charging control method according to claim 4, characterized in that: In determining the maximum voltage difference V of the capacitor e Is it greater than the second set voltage value V set2 The steps that follow include: When the capacitor has the maximum voltage difference V e Greater than the second set voltage value V set2 When the super capacitor is charged, the control module controls the switch module to charge the super capacitor.

6. The charging control method according to claim 5, characterized in that: The first set voltage value V set2 =V 标称 ×β, where V 标称 is the nominal voltage of the supercapacitor, β is a constant, and 10%≤β≤15%.

7. A computer-readable storage medium storing a computer program, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the charging control method according to any one of claims 1 to 6.

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