Battery by-product deposit removal equipment

Abstract

A by-product deposit removal device is provided that can enhance the effect of removing by-product deposits that occur on the electrodes of a storage battery. [Solution] The by-product deposit removal device includes an electrode connection part connected to the electrodes of a storage battery, and a removal signal generation part that generates a by-product deposit removal signal using current extracted from the electrodes of the storage battery via the electrode connection part. The removal signal consists of a periodic pulse current, and when the amplitude value of the rising edge of a single pulse current waveform of the removal signal is H1 and the amplitude value of the undershoot after the falling edge of the pulse current waveform is H2, H2 is 0.2 to 1.0 times H1. Furthermore, when the time width of the rising edge of the pulse current waveform is T1 and the time width of the falling edge accompanied by an undershoot is T2, T2 is 0.02 to 0.2 times T1.

Description

[Technical Field]

[0001] The present invention relates to a by-product deposit removal device for removing by-product deposits formed on electrodes of a storage battery. [Background technology]

[0002] Storage batteries are widely used. The deterioration of storage batteries can be broadly divided into two types: cycle deterioration due to repeated charging and discharging, and storage deterioration due to storage period. Both types of deterioration are caused by the accumulation of by-products on the electrodes. The accumulation of by-products is caused by electrolyte decomposition and self-discharge in high-temperature environments, overcharging and over-discharging, etc., which increases internal resistance, reduces capacity, and causes the risk of internal short circuits.

[0003] Regarding technologies for preventing and removing by-product deposits that occur on the electrodes of storage batteries, for example, adding carbon materials to lead (Pb), which is the electrode material of lead-acid batteries, or using surfactants or metal ion regulators in the case of electrolytes, can be effective, but in most cases complete prevention or removal is not possible, which remains an issue. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-33688 [Patent Document 2] Japanese Patent Application Publication No. 9-45362 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present invention is to further enhance the effect of preventing and removing by-product deposits that occur on the electrodes of a storage battery, and to maintain the electrodes in a new condition or remove the deposits to a condition as close to new as possible by always leaving the electrodes attached. [Means for solving the problem]

[0006] In order to solve the above problems, the by-product deposit removal device of the present invention comprises an electrode connection part connected to an electrode of a storage battery, and a removal signal generation part that generates a removal signal for the by-product deposit using a current extracted from the electrode of the storage battery via the electrode connection part, the removal signal consisting of a periodic pulse current, and where the amplitude value of the rising edge of a single pulse current waveform of the removal signal is H1 and the amplitude value of the undershoot after the falling edge of the pulse current waveform is H2, H2 is 0.2 to 1.0 times H1, and where the time width of the rising edge of the pulse current waveform is T1 and the time width of the falling edge accompanied by the undershoot is T2, T2 is 0.02 to 0.2 times T1.

[0007] According to the present invention, a steep pulse current can be applied to by-product deposits formed on the electrodes of a storage battery, thereby enabling the by-product deposits to be efficiently removed without damaging the electrodes.

[0008] In the present invention, the pulse current waveform preferably includes a ringing waveform following the undershoot, and the time width T3 of the ringing waveform is 2 to 10 times the time width T2. By including ringing in the pulse current, it is possible to apply slight vibrations to the by-product deposits, thereby promoting their re-dissolution (reduction) in the electrolyte. It is also possible to prevent the adhesion (crystallization) of the by-products. [Effects of the Invention]

[0009] Thus, according to the present invention, it is possible to provide a by-product deposit removal device that further enhances the effect of preventing and removing by-product deposits that occur on the electrodes of a storage battery, and that, by being left installed at all times, can maintain the electrodes in a new condition or remove deposits to a condition as close to new as possible. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a functional block diagram showing the circuit configuration of a by-product deposit removal device according to an embodiment of the present invention. [Figure 2]FIG. 2 is a current waveform diagram of a signal for removing by-product deposits removed from the positive electrode of a storage battery, where (a) is an overall view and (b) is an enlarged view of a single pulse current waveform. [Figure 3] FIG. 3 is a graph showing the transition of the electrical characteristics of the lead acid battery according to Example 1, where (a) shows the internal resistance value and (b) shows the CCA value. [Figure 4] FIG. 4 is a graph showing the transition of the electrical characteristics of the lead acid battery according to Example 2, where (a) shows the internal resistance value and (b) shows the CCA value. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0012] FIG. 1 is a functional block diagram showing the circuit configuration of a by-product deposit removal device 10 according to an embodiment of the present invention.

[0013] 1, a by-product deposit removal device 10 according to this embodiment is used by connecting it to a pair of electrodes of a storage battery 30, and includes a positive terminal 10A and a negative terminal 10B, a power supply unit 11, and a removal signal generator 12 that generates a removal signal for removing by-product deposits. The positive terminal 10A is connected to a positive electrode 31A of the storage battery 30 via a power cable 19A, and the negative terminal 10B is connected to a negative electrode 31B of the storage battery 30 via a power cable 19B. The positive terminal 10A and the negative terminal 10B, together with the power cables 19A and 19B, constitute electrode connectors for connecting the removal signal generator 12 to the positive electrode 31A and negative electrode 31B of the storage battery 30, respectively.

[0014] The storage battery 30 is, for example, a lead-acid battery, and in this case, the by-product deposit is a lead sulfate film that occurs on the negative electrode of the lead-acid battery. The storage battery 30 is not limited to a lead-acid battery, but may be a nickel-metal hydride battery or a lithium-ion battery, and various secondary batteries that generate by-product deposits on the electrodes through repeated use can be used.

[0015] The removal signal generator 12 includes a drive signal generator 13, a switching circuit 17 that performs switching operations in accordance with the drive signal output from the drive signal generator 13, and a drive resistor R1 for adjusting the current flowing through the switching circuit 17 to a predetermined value. The positive terminal 10A is connected to the negative terminal 10B via a current line Lp in which the drive resistor R1 and the switching circuit 17 are connected in series, and the negative terminal 10B is signal grounded. The positive terminal 10A is also connected to the power supply 11 via a current line Ld. Current extracted from the positive terminal 31A of the storage battery 30 of the by-product deposit removal device 10 is supplied to the switching circuit 17 via the current line Lp and also to the power supply 11 via the current line Ld.

[0016] The power supply unit 11 includes a DC / DC converter for stepping down the output voltage of the storage battery 30 (for example, 12 to 48 V).

[0017] The drive signal generating unit 13 includes a pulse generating circuit 14 that generates a pulse signal and a waveform shaping circuit 15 that shapes the waveform of the pulse signal, and the switching circuit 17 performs switching operation based on the pulse signal after waveform shaping.

[0018] The pulse generating circuit 14 is a circuit that generates a drive signal for driving the switching circuit 17, has an internal oscillator, and outputs a rectangular wave pulse signal with a predetermined pulse width at a predetermined period. The pulse generating circuit 14 according to this embodiment generates a rectangular wave pulse signal with a pulse width of 300 nsec or more and a pulse period of 30 μsec or more, for example.

[0019] The waveform shaping circuit 15 shapes the rectangular pulse signal generated by the pulse generating circuit 14 into a sawtooth wave and outputs the waveform. That is, the waveform shaping circuit 15 outputs a pulse wave with a gradual rise and a steep fall as a drive signal. By making the rise of the pulse wave gradual in this way, it is possible to suppress a sudden increase in the value of the current that flows when the switching circuit 17 is turned on. Furthermore, by making the fall of the pulse wave steep, it is possible to quickly execute the switching operation of the switching circuit 17, which operates using the falling edge as a trigger.

[0020] The pulse period of the drive signal is not limited to 30 μsec or more, but may be 20 to 200 μsec. The pulse width of the drive signal is not limited to 300 nsec, but may be 300 to 1500 nsec.

[0021] The drive resistor R1 is used to adjust the value of the current flowing through the current line Lp, and its resistance value is selected so that the maximum value of the pulse current is, for example, 300 mA or more. The resistance value of the drive resistor R1 can be determined depending on the rated voltage of the storage battery 30 and the input resistance value of the power supply unit 11.

[0022] The switching circuit 17 includes a switching element such as a MOSFET, and performs switching operations in accordance with the sawtooth pulse signal output from the waveform shaping circuit 15. When the switching circuit 17 is in the on state, it draws current from the storage battery 30, and when the switching circuit 17 is in the off state, it stops drawing current from the storage battery 30. As a result, a by-product deposit removal signal consisting of a sawtooth pulse current as shown in Figures 2(a) and 2(b) is drawn from the positive electrode 31A of the storage battery 30. The pulse period T0 of the removal signal is equal to the pulse period of the drive signal, and the pulse width T1 of the removal signal is approximately equal to the pulse width of the drive signal, although strictly speaking there is some deviation due to the influence of the switching element.

[0023] In this way, the by-product deposit removal device 10 can extract a pulsed current from the positive electrode 31A of the storage battery 30 in accordance with the drive signal output by the drive signal generation unit 13. That is, when the switching circuit 17 is turned on in accordance with the drive signal, a current whose peak value is limited by the drive resistor R1 is extracted from the storage battery 30, and this current flows to ground through the current line Lp and the switching circuit 17. When the switching circuit 17 is turned off in accordance with the drive signal, the flow of current from the positive electrode 31A of the storage battery 30 to ground stops. As a result, the sawtooth pulsed current shown in FIGS. 2(a) and 2(b) is extracted from the positive electrode 31A of the storage battery 30.

[0024] Furthermore, when the switching circuit 17 is turned off in response to the falling edge of the drive signal and the extraction of current from the storage battery 30 is stopped, a back electromotive force is generated due to the inductance components including the positive power cable 19A, the negative power cable 19B, and the storage battery 30, causing a spike-like reverse current to flow. This reverse current acts on the negative electrode 31B of the storage battery 30, thereby removing by-products deposited on the negative electrode 31B of the storage battery 30.

[0025] In this embodiment, the drive signal input to the switching circuit 17 is a sawtooth wave, and the rising edge of the pulse changes gradually. Therefore, the current value extracted from the positive electrode 31A of the storage battery 30 also increases gradually, but the current instantaneously transitions to the OFF state during the OFF operation. Therefore, a sawtooth pulse current with a stable peak value can be extracted from the positive electrode 31A of the storage battery 30. Furthermore, the steep fall from the peak of the sawtooth wave can generate a spike-like reverse current (undershoot) with a high peak and a narrow pulse width, and a current in the opposite direction to the discharge current can be applied to the negative electrode 31B of the storage battery 30. As will be described in detail later, the peak value of the spike-like reverse current is preferably 0.2 to 1.0 times the peak value of the forward sawtooth pulse current.

[0026] When the spike-shaped reverse current acts on the negative electrode 31B of the storage battery 30, the by-product deposits (lead sulfate coating in a lead-acid battery) deposited on the negative electrode 31B of the storage battery 30 are peeled off and separated into molecules, and the area of ​​the part of the electrode surface covered with the by-product deposits that is involved in charging is restored to its original area. In the case of a lead-acid battery, the molecular lead sulfate crystals in the electrolyte that have separated from the electrode are decomposed during charging to become lead ions and sulfate ions. Furthermore, during charging, the generation of H2O, which is generated during the discharge of a lead-acid battery, also stops, resulting in an improvement in the specific gravity of the electrolyte.

[0027] As shown in Figure 2(b), when the amplitude value of the rising portion of a single pulse current waveform of the removal signal is H1 and the amplitude value of the undershoot after the falling edge of the pulse current waveform is H2, H2 is preferably 0.2 to 1.0 times H1, and more preferably 0.3 to 0.9 times.

[0028] H1 is the amplitude of the sawtooth wave from the zero-crossing point to the rising peak, and H2 is the amplitude of the underpulse from the zero-crossing point to the undershoot peak. If H2 is less than 0.2 times H1, the effect on by-product deposits is weak, and almost no by-product deposit removal effect is achieved. On the other hand, if H2 is greater than 1.0 times H1, the underpulse may act not only on the surface but also on the interior of the electrodes of the storage battery 30, potentially damaging the electrodes. By setting H2 to 0.2 to 1.0 times H1, the spike-shaped reverse current acts only on by-product deposits covering the surface of the electrodes, allowing the by-product deposits to be reduced without damaging the electrodes. Therefore, by-product deposits can be effectively removed.

[0029] As described above, the amplitude value H1 of the rising portion (sawtooth wave) of the single pulse current waveform is preferably, for example, 300 mA or more. If H1 is too small, it takes a long time to remove the by-product deposits, and the by-product deposits cannot be removed effectively. On the other hand, if H1 is too large, the power consumption of the storage battery 30 increases and the electrodes of the storage battery may be damaged. If H1 is, for example, 300 mA, and the pulse current is appropriate, a spike-shaped reverse current (underpulse) of appropriate magnitude can be generated without damaging the electrodes, thereby improving the by-product deposit removal effect.

[0030] When the rising time width of a single pulse current waveform is T1 and the falling time width accompanied by an undershoot is T2, T2 is preferably 0.02 to 0.2 times T1. If T2 is less than 0.02 times T1, T2 becomes too small compared to T1, causing the undershoot amplitude value H2 to become too large, which makes the electrodes more susceptible to damage. Alternatively, if T1 becomes too large compared to T2, power consumption increases, leading to a rapid drop in the charging rate of the storage battery 30. Furthermore, heat generated by power consumption may reduce the effectiveness of removing by-product deposits.

[0031] Furthermore, if T2 is greater than 0.2 times T1, T2 becomes too large compared to T1, causing the undershoot amplitude H2 to become too small, which results in an ineffective removal of by-product deposits. Alternatively, if T1 becomes too small compared to T2, the capacitor for generating the sawtooth wave will not be charged sufficiently, which results in an excessively small undershoot amplitude H2, which results in an ineffective removal of by-product deposits. By setting T2 to 0.02 to 0.2 times T1, a large undershoot will be generated, making it possible to effectively remove by-product deposits adhering to the surfaces of the electrodes of the storage battery 30.

[0032] The pulse current waveform of the removal signal preferably includes a ringing waveform following an undershoot. The ringing provides a slight vibration to the by-product deposits, promoting their re-dissolution (reduction) in the electrolyte. It also has a preventative effect of suppressing the adhesion (crystallization) of by-products. The time width T3 of the ringing waveform is preferably 100 nsec or more, and particularly preferably 200 nsec or more. For example, in lithium-ion batteries, the effect of re-dissolution (reduction) of by-products can be particularly enhanced by using a pulse including a ringing waveform.

[0033] T1 is approximately equal to the pulse width of the drive signal (e.g., 300 nsec). T2 is 300 nsec or less, and preferably 5 nsec to 300 nsec. If the pulse current waveform of the removal signal has a steep falling edge, not only undershoot but also ringing can be generated, and the ringing action can further enhance the removal effect of by-product deposits.

[0034] If the storage battery 30 is, for example, a lead-acid battery, a lead sulfate film, which is a by-product deposit, forms on its negative electrode. In this embodiment, a forward current (discharge direction) extracted from the positive electrode 31A of the storage battery 30 can be used to generate a nano-pulse current in the opposite direction (charge direction) to the discharge direction, and this nano-pulse current can be applied to the negative electrode 31B of the storage battery 30. Therefore, the by-product deposited on the negative electrode 31B of the storage battery 30 can be removed by electrolysis, and the by-product deposit can be efficiently removed without damaging the electrode.

[0035] As described above, the by-product deposit removal device 10 according to this embodiment includes a removal signal generator 12 that generates a by-product deposit removal signal using a current extracted from the electrodes of the storage battery 30. The removal signal consists of a periodic pulse current. When the amplitude of the rising portion of a single pulse current waveform of the removal signal is H1 and the amplitude of the undershoot after the falling edge of the pulse current waveform is H2, H2 is 0.2 to 1.0 times H1. When the time width of the rising edge of the pulse current waveform is T1 and the time width of the falling edge accompanied by the undershoot is T2, T2 is 0.02 to 0.2 times T1. Therefore, by-product deposits adhering to the surfaces of the electrodes can be efficiently removed without damaging the electrodes of the storage battery.

[0036] The above describes a preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention, and it goes without saying that these modifications are also included within the scope of the present invention.

[0037] For example, the by-product deposit removal device according to the present invention is not limited to applications for removing lead sulfate coatings formed on the electrodes of lead-acid batteries, but can be applied to various applications for removing by-product deposits formed on the electrodes of batteries by electrolysis. [Example]

[0038] (Example 1: Degradation and recovery report of carbon-containing Pb electrodes) A new lead-acid battery (12V battery) containing carbon in the electrode material was prepared and installed in a vehicle. As mentioned above, carbon in the Pb electrode is known to have the effect of suppressing sulfation. Before starting use of this new lead-acid battery, its electrical characteristics, such as internal resistance, CCA (Cold Cranking Ampere), and electrolyte specific gravity, were measured. Regarding specific gravity, the specific gravity of the electrolyte in each of the six cells that make up the 12V battery was measured using a hydrometer, and the average value was calculated. As shown in Table 1, the internal resistance of the battery (BT) was 6.45 mΩ, the CCA value was 381, and the average electrolyte specific gravity was 1.268.

[0039] After four years of use, the car dealer recommended battery replacement at each required inspection, but the battery continued to be used without replacement. Five years and seven days after the battery was first used, the by-product sediment removal device (this device) of the present invention was installed and a recovery test was initiated. The electrical characteristics of the lead-acid battery were confirmed in advance. The battery's capacity was also evaluated. Capacity measurements were performed with a discharge current of 6.0 A (30 Ah, 5-hour rate), a cut-off voltage of 10.5 V, and the starting conditions were immediately after full charge. The results were an internal resistance of 14.35 mΩ, a CCA value of 171, an average electrolyte specific gravity of 1.197, a measured capacity of 206.916 Wh (17.960 Ah), and a discharge time of 2 hours, 57 minutes, and 10 seconds. This confirmed that the lead-acid battery was indeed in a deteriorated state.

[0040] When the recovery status of the lead-acid battery was checked 23 days after the start of the recovery test, the internal resistance was 8.43mΩ, the CCA value was 292, the electrolyte specific gravity value (average value) was 1.239, the measured capacity was 235.878Wh (20.474Ah), and the discharge time was 3 hours 21 minutes 50 seconds. In this way, it was confirmed that the battery characteristics had entered the recovery range.

[0041] The recovery test was continued, and the recovery status of the lead-acid battery was checked 1 year and 309 days after the start of the recovery test. The internal resistance was 6.75 mΩ, the CCA value was 364, the electrolyte specific gravity (average) was 1.268, the measured capacity was 330.030 Wh (28.644 Ah), and the discharge time was 4 hours, 46 minutes, and 44 seconds. The changes in the internal resistance and CCA values ​​are shown in Figures 3(a) and (b), respectively. This confirmed that the battery's characteristics were fully recovered by continuing to use this device.

[0042] [Table 1] From the above results, it was confirmed that the use of this device can fully restore the deterioration of lead-acid batteries caused by sulfation, which cannot be completely prevented even when using carbon-containing Pb electrode materials.

[0043] (Example 2: Recovery experiment with additive (surfactant) injection) To restore an automotive lead-acid battery (12V battery) that had deteriorated due to long-term use, a restoration test was conducted in which an additive (surfactant) was added to the electrolyte and the battery was then used continuously. At the start of the restoration test, the electrical characteristics of the lead-acid battery were measured, including internal resistance, CCA (Cold Cranking Ampere), electrolyte specific gravity, and capacity. As shown in Table 2, the battery (BT) internal resistance was 8.93 mΩ, the CCA value was 288, the electrolyte specific gravity (average) was 1.222, the measured capacity was 208.757 Wh (18.120 Ah), and the discharge time was 2 hours, 56 minutes, and 41 seconds.

[0044] The recovery status of the lead-acid battery was checked 33 days after the start of the test. The results were: internal resistance 8.11mΩ, CCA value 294, electrolyte specific gravity (average value) 1.230, measured capacity 232.030Wh (20.140Ah), and discharge time 3 hours 11 minutes 03 seconds. Thus, some recovery in the battery characteristics was observed.

[0045] The recovery test was continued after that, and the recovery status of the lead-acid battery was checked 40 days after the test start date. The results were: internal resistance 7.88mΩ, CCA value 312, electrolyte specific gravity (average value) 1.238, measured capacity 266.334Wh (23.118Ah), and discharge time 3 hours 35 minutes 44 seconds.

[0046] Furthermore, 56 days after the start of the test, the internal resistance was 7.99mΩ, the CCA value was 306, the average specific gravity of the electrolyte was 1.233, the measured capacity was 239.998Wh (20.832Ah), and the discharge time was 3 hours, 17 minutes, and 17 seconds.Thus, although the battery characteristics gradually recovered over the course of approximately three months, the values ​​tended to saturate and no significant recovery was observed.

[0047] Therefore, the by-product deposit removal device (the present device) of the present invention was attached to the lead-acid battery and the recovery test was continued. The recovery status of the lead-acid battery was checked 14 days after the date of attachment of the device. The results were: internal resistance 6.87 mΩ, CCA value 358, electrolyte specific gravity (average value) 1.238, measured capacity 311.791 Wh (27.063 Ah), and discharge time 4 hours 31 minutes 11 seconds. The changes in internal resistance and CCA value are shown in Figures 4(a) and (b), respectively. As described above, the use of the by-product deposit removal device of the present invention resulted in rapid recovery of battery characteristics, and good results were obtained.

[0048] [Table 2]

[0049] From the above results, it was confirmed that the use of this device can fully restore the deterioration of lead-acid batteries caused by sulfation, which cannot be completely prevented even with the use of additives (surfactants).

[0050] (Example 3: Recovery experiment of laminated lithium-ion battery) A recovery experiment was conducted by applying the by-product deposit removal device (this device) according to the present invention to a laminated lithium-ion battery. In the recovery experiment, lithium-ion battery samples No. 1 to No. 3 were prepared, and the lithium-ion battery was charged and discharged with this device attached to attempt recovery.

[0051] The lithium-ion battery was charged in constant current / constant voltage (CCCV) mode at a constant current of 0.2 ItA until the voltage reached 4.2V. After the voltage reached 4.2V, charging continued at a constant voltage of 4.2V until the voltage reached 0.01 ItA. After a 30-minute charging pause, the lithium-ion battery was discharged. The battery was discharged in constant current (CC) mode at a constant current of 0.2 ItA until the voltage reached 2.75V.

[0052] The above charge → charge pause → discharge cycle was considered one cycle of charge / discharge operation, and the charge / discharge operation was repeated a specified number of times while the device was operated. In this manner, recovery experiments were conducted on lithium-ion battery samples No. 1, No. 2, and No. 3, and the capacity of the lithium-ion batteries before and after the recovery experiments was measured by an official testing institution. The capacity measurements were conducted in a constant temperature oven with a fan at 25°C after discharging and fully charging under the same conditions. The results are shown in Table 3.

[0053] [Table 3]

[0054] The nominal capacity of lithium-ion battery sample No. 1 is 1400mAh, but before the device was installed, the capacity was 1196mAh. After 215 charge / discharge cycles with the device installed, the capacity was measured again and found to be 1255mAh, a capacity increase rate of 4.70%.

[0055] The lithium-ion battery sample No. 2 also has a nominal capacity of 1400 mAh, but before the device was installed, its capacity was 968 mAh. After 215 charge / discharge cycles with the device installed, the capacity was measured again and found to be 1055 mAh, a capacity increase of 8.25%. As such, sample No. 2 was more deteriorated than sample No. 1, but like sample No. 1, it recovered, and in particular, its capacity increase rate exceeded that of sample No. 1.

[0056] The lithium-ion battery sample No. 3 has a nominal capacity of 2500 mAh, but before the device was installed, its capacity was 2491 mAh. After 410 charge / discharge cycles with the device installed, the capacity was measured again and found to be 2566 mAh, a capacity increase of 2.92%. Thus, although there was little degradation in sample No. 3, the application of the device restored its capacity, resulting in excellent results exceeding the nominal capacity.

[0057] From the above results, it was confirmed that the use of this device is effective in restoring the deterioration of lithium-ion batteries. Therefore, the recovery device of the present invention makes it possible to reuse deteriorated batteries, contributing to the reduction of discarded batteries and CO2 emissions. [Explanation of symbols]

[0058] 10 By-product deposit removal device 10A positive terminal 10B Negative terminal 11 Power supply section 12 Removal signal generation section 13 Drive signal generation unit 14 Pulse generating circuit 15 Waveform shaping circuit 17 Switching Circuits 19A power cable 19B Power Cable 30 Storage battery 31A positive electrode 31B Negative electrode Ld current line Lp current line R1 drive resistor

Claims

1. A by-product deposit removal device for removing by-product deposits generated on electrodes of a storage battery, an electrode connection portion connected to the electrode of the storage battery; a removal signal generating unit that generates a removal signal for the by-product deposit using a current extracted from the electrode of the storage battery via the electrode connection unit; the removal signal comprises a periodic pulse current; The amplitude value of the rising edge of the single pulse current waveform of the removal signal is H １ The amplitude value of the undershoot after the falling edge of the pulse current waveform is H ２ When the above H ２ is the above H １ 0.2 to 1.0 times the The rising time width of the pulse current waveform is T １ and the time duration of the falling edge accompanied by the undershoot is T ２ When the above T ２ is the above T １ The by-product deposit removal device is characterized in that the amount of the by-product deposit removal agent is 0.02 to 0.2 times the amount of the by-product deposit removal agent.

2. The pulse current waveform includes a ringing waveform following the undershoot, and the time width T ３ is the T ２ 2. The by-product deposit removal device according to claim 1, wherein the concentration of the by-product deposit removal agent is 2 to 10 times the concentration of the by-product deposit removal agent.

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