Soft start control circuit and power battery

Abstract

The utility model provides a soft start control circuit. The soft start control circuit comprises a pre-charging current-limiting resistor, a delay start circuit and a relay control circuit. The time-delay starting circuit is composed of a first divider resistor, a first time-delay capacitor and a first electronic switching tube, and controls the time-delay conduction of the first electronic switching tube through an RC time-delay principle. The relay control circuit comprises a power relay and a fly-wheel diode and is used for controlling on-off of the circuit. The pre-charging current-limiting resistor is connected between the charging anode of the aging cabinet and the input anode of the battery protection board and is used for limiting the current in the initial charging stage. When the circuit is started, the pre-charging current-limiting resistor is short-circuited after the first electronic switching tube is switched on in a delayed manner, so that the influence of peak current on the battery protection board is effectively inhibited. The soft start control circuit is used as an external circuit, and compared with a mode that a pre-charging circuit is integrated in the battery protection board, the design cost can be reduced, the implementation process can be simplified, and the flexibility of the soft start control circuit can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery management systems, in particular to a soft start control circuit and a power battery. BACKGROUND

[0002] In the application field of small power battery protection boards (BMS, Battery Management System), such as two-wheeled vehicles and vacuum cleaners, the safety and stability of the battery are crucial. However, in the existing battery protection board, during the aging cabinet charging process, a sharp peak current is easily generated at the moment of charging. The sharp peak current often exceeds the fuse blowing parameters, causing the fuse to be mistakenly blown, thereby causing the battery protection board to be damaged, increasing the defective rate and rework cost.

[0003] A common method in the prior art is to connect a capacitor in parallel to the battery protection board charging port to suppress the charging sharp peak current. However, this method can reduce the fuse blowing error to a certain extent, but it cannot completely solve the problem. In the aging charging process of a large number of battery protection boards, a considerable number of protection boards will still have their fuses burned out due to sharp peak current.

[0004] Another method is to add a pre-charge circuit inside the battery protection board to completely avoid the fuse from being mistakenly blown due to the sharp peak current generated by the aging cabinet. However, this method is effective, but it significantly increases the complexity of circuit design and material cost. The integration of the pre-charge circuit requires the use of pins of the integrated chip, thereby increasing the number of components and the layout difficulty and production cost of the battery protection board. UTILITY MODEL CONTENT

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a soft start control circuit with a pre-charge circuit and a power battery.

[0006] The purpose of the present disclosure is achieved by the following technical solutions:

[0007] A soft start control circuit, comprising a pre-charge current limiting resistor, a delay start circuit and a relay control circuit, the delay start circuit comprising a first voltage dividing resistor, a first delay capacitor and a first electronic switch tube, the first end of the first voltage dividing resistor being used to connect with the positive electrode of the aging cabinet charging, the second end of the first voltage dividing resistor being connected with the control end of the first electronic switch tube, the first end of the first delay capacitor being connected with the first end of the first voltage dividing resistor, the second end of the first delay capacitor being connected with the negative electrode of the aging cabinet charging, the first end of the first electronic switch tube being connected with the second end of the inductor coil of the relay control circuit, and the second end of the first electronic switch tube being connected with the negative electrode of the aging cabinet charging.

[0008] The relay control circuit comprises a power relay and a freewheeling diode, a negative electrode of the freewheeling diode is connected with a first end of an inductor coil of the power relay, a positive electrode of the freewheeling diode is connected with a second end of the inductor coil of the power relay, a first end of a normally open contact of the power relay is connected with a first end of the pre-charge current-limiting resistor, and a second end of the normally open contact of the power relay is connected with a second end of the pre-charge current-limiting resistor.

[0009] The first end of the pre-charge current-limiting resistor is used for being connected with a positive electrode of a charging of an aging cabinet, and the second end of the pre-charge current-limiting resistor is used for being connected with a positive electrode of an input of a battery protection board.

[0010] In one of the embodiments, the delay start circuit further comprises a second voltage dividing resistor, a first end of the second voltage dividing resistor is used for being connected with the positive electrode of the charging of the aging cabinet, and a second end of the second voltage dividing resistor is connected with a first end of the first delay capacitor.

[0011] In one of the embodiments, the delay start circuit further comprises a second delay capacitor, a first end of the second delay capacitor is connected with the first end of the first delay capacitor, and a second end of the second delay capacitor is grounded.

[0012] In one of the embodiments, the delay start circuit further comprises a current conducting diode, a positive electrode of the current conducting diode is used for being connected with the positive electrode of the charging of the aging cabinet, and a negative electrode of the current conducting diode is connected with the first end of the second voltage dividing resistor.

[0013] In one of the embodiments, the delay start circuit further comprises a pull-down resistor, a first end of the pull-down resistor is connected with a control end of the first electronic switch tube, and a second end of the pull-down resistor is connected with a negative electrode of the charging of the aging cabinet.

[0014] In one of the embodiments, the relay control circuit further comprises a first current-limiting resistor, a first end of the first current-limiting resistor is connected with the first end of the inductor coil of the power relay, and a second end of the first current-limiting resistor is connected with the second end of the inductor coil of the power relay.

[0015] In one of the embodiments, the relay control circuit further comprises a light emitting diode, a positive electrode of the light emitting diode is connected with the second end of the first current-limiting resistor, and a negative electrode of the light emitting diode is connected with the second end of the inductor coil of the power relay.

[0016] In one of the embodiments, the first electronic switch tube is an N-channel MOS tube.

[0017] In one of the embodiments, the power relay is of a model of HF16F / 12-HT.

[0018] A power battery comprises the soft start control circuit according to any one of the preceding aspects.

[0019] Compared with the prior art, the present disclosure has at least the following advantages:

[0020] 1. The soft start control circuit according to the preceding aspect effectively suppresses the influence of sharp current on the battery protection board by using an RC delay circuit to control the delay conduction of the first electronic switch tube and short-circuiting the pre-charge current-limiting resistor after conduction. Compared with the way of integrating a pre-charge circuit inside the battery protection board, the soft start control circuit as an external circuit can reduce the circuit design cost and simplify the implementation process, and improve the flexibility of the soft start control circuit. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 The circuit diagram of the soft start control circuit of an embodiment. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present disclosure, the following will make a more comprehensive description of the present disclosure with reference to the related drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the description of the present disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0027] like Figure 1 As shown, a soft-start control circuit 10 according to an embodiment of this disclosure includes a pre-charge current-limiting resistor RT1, a delayed start circuit 100, and a relay control circuit 200. The delayed start circuit 100 includes a first voltage divider resistor R5, a first delay capacitor C3, and a first electronic switch Q1. The first end of the first voltage divider resistor R5 is connected to the positive terminal of the aging chamber charging, and the second end of the first voltage divider resistor R5 is connected to the control terminal of the first electronic switch Q1. The first end of the first delay capacitor C3 is connected to the first end of the first voltage divider resistor R5, and the second end of the first delay capacitor C3 is connected to the negative terminal of the aging chamber charging. The first end of the first electronic switch Q1 is connected to the second end of the inductor coil of the relay control circuit 200, and the second end of the first electronic switch Q1 is connected to the negative terminal of the aging chamber charging.

[0028] The relay control circuit 200 includes a power relay K1 and a freewheeling diode D2. The cathode of the freewheeling diode D2 is connected to the first terminal of the inductor coil of the power relay K1, and the anode of the freewheeling diode D2 is connected to the second terminal of the inductor coil of the power relay K1. The first terminal of the normally open contact of the power relay K1 is connected to the first terminal of the pre-charge current limiting resistor RT1, and the second terminal of the normally open contact of the power relay K1 is connected to the second terminal of the pre-charge current limiting resistor RT1.

[0029] The first end of the pre-charge current limiting resistor RT1 is used to connect to the positive terminal of the aging cabinet charging, and the second end of the pre-charge current limiting resistor RT1 is used to connect to the positive input terminal of the battery protection board.

[0030] In the embodiment, before the charging starts, the normally open contact of the power relay K1 is in the open state, and at this time, the pre-charge current-limiting resistor RT1 is connected in series between the positive electrode of the aging cabinet charging and the positive electrode of the battery protection board, so that the pre-charge current-limiting resistor RT1 can limit the current size at the initial stage of charging and prevent the impact of the instantaneous large current on the battery protection board and the battery. When the soft start control circuit 10 is connected to the aging cabinet and starts to supply power, a part of the current passes through the first voltage dividing resistor R5, and another part of the current starts to charge the first delay capacitor C3. Since the control end of the first electronic switch tube Q1 is connected to the second end of the first voltage dividing resistor R5, the voltage gradually rises but has not yet reached the threshold voltage of the first electronic switch tube Q1, and the first electronic switch tube Q1 remains in the off state. With the gradual rise of the voltage across the first delay capacitor C3, until the voltage at the control end of the first electronic switch tube Q1 is greater than the conduction threshold voltage thereof, the first electronic switch tube Q1 is turned on. When the first electronic switch tube Q1 is turned on, the current output from the external power supply flows into the first end of the inductor coil of the power relay K1, and the coil in the power relay K1 is energized to generate an electromagnetic field, so that the normally open contact of the relay is attracted to form a path, and the pre-charge current-limiting resistor RT1 is short-circuited.

[0031] Specifically, at the initial stage of charging of the aging cabinet, since the pre-charge current-limiting resistor RT1 plays a role in limiting the peak current, the impact of the instantaneous large current on the battery protection board and the battery is prevented, so that the charging current gradually increases to the normal value within a period of time, rather than reaching the maximum value instantaneously. After the normally open contact of the power relay K1 is attracted and the pre-charge current-limiting resistor RT1 is short-circuited, the charging circuit becomes directly connected. At this time, since the pre-charge phase has been passed and the battery voltage has approached the charging voltage, a large instantaneous current will not be generated, thereby ensuring that the battery protection board is not affected by the peak current by the soft start control circuit 10.

[0032] The soft start control circuit 10 described above can effectively suppress the impact of the peak current on the battery protection board by using the RC delay circuit to control the delay conduction of the first electronic switch tube Q1 and short-circuiting the pre-charge current-limiting resistor RT1 after conduction. Compared with the way of integrating the pre-charge circuit in the battery protection board, the soft start control circuit 10 as an external circuit can reduce the circuit design cost and simplify the implementation process, while improving the flexibility of the soft start control circuit 10.

[0033] As Figure 1As shown in the figure, in one embodiment, the delay start circuit 100 further comprises a second voltage dividing resistor R1, a first end of the second voltage dividing resistor R1 is connected with the positive pole of the aging cabinet, and a second end of the second voltage dividing resistor R1 is connected with a first end of the first delay capacitor C3. In this embodiment, when the soft start control circuit 10 is connected to the aging cabinet and starts to supply power, the current first flows through the second voltage dividing resistor R1 and then flows to the first delay capacitor C3, so that the second voltage dividing resistor R1 shares the current from the positive pole of the aging cabinet, plays a role of current sharing, and the second voltage dividing resistor R1 and the first delay capacitor C3 form an RC delay network, so that the conduction time of the first electronic switch tube Q1 can be more accurately controlled through the RC delay network. Specifically, due to the existence of the second voltage dividing resistor R1, the charging speed of the first delay capacitor C3 becomes more gentle, so that the rising rate of the voltage at the control end of the first electronic switch tube Q1 will slow down, thereby prolonging the time when the first electronic switch tube Q1 is turned on, providing a longer pre-charging time for the battery protection board and the battery, and further ensuring that the battery can enter a normal working state more safely and more stably before formal charging.

[0034] As shown in the figure, Figure 1 In one embodiment, the delay start circuit 100 further comprises a second delay capacitor C2, a first end of the second delay capacitor C2 is connected with a first end of the first delay capacitor C3, and a second end of the second delay capacitor C2 is grounded. In this embodiment, when the soft start control circuit 10 is connected to the aging cabinet and starts to supply power, the current charges the first delay capacitor C3 and the second delay capacitor C2 at the same time through the first voltage dividing resistor R5. Due to the introduction of the second delay capacitor C2, the capacitance value of the RC delay network is increased, which causes the rising rate of the voltage at the control end of the first electronic switch tube Q1 to further slow down, thereby providing a more fine and controllable delay for the conduction of the first electronic switch tube Q1, and further making the current limitation at the initial stage of charging more stable and effective.

[0035] As shown in the figure, Figure 1As shown, in one embodiment, the delayed start circuit 100 further includes a current-conducting diode D1. The positive terminal of the current-conducting diode D1 is connected to the positive terminal of the aging cabinet charging, and the negative terminal of the current-conducting diode D1 is connected to the first end of the second voltage divider resistor R1. In this embodiment, before charging begins, the current-conducting diode D1 is in a reverse cutoff state, with its positive terminal connected to the positive terminal of the aging cabinet charging and its negative terminal connected to the second voltage divider resistor R1. When the soft-start control circuit 10 is connected to the aging cabinet and starts supplying power, the voltage of the positive terminal of the aging cabinet charging rises. Since the current-conducting diode D1 has unidirectional conductivity, it allows current to flow from the positive terminal of the aging cabinet charging to the second voltage divider resistor R1. At this time, the current flows through the current-conducting diode D1 and then through the second voltage divider resistor R1, thereby charging the first delay capacitor C3 and preventing current from flowing back to the positive terminal of the aging cabinet charging. During the charging process of the first delay capacitor C3, the current-conducting diode D1 remains in a forward-conducting state, allowing the voltage across the first delay capacitor C3 to gradually and steadily increase, thereby causing the control terminal voltage of the first electronic switch Q1 to gradually increase as well. When the control terminal voltage of the first electronic switch Q1 exceeds its threshold voltage, the first electronic switch Q1 turns on, thereby triggering the power relay K1 to engage and short-circuiting the pre-charge current-limiting resistor RT1, ensuring that the delay start circuit 100 can operate normally.

[0036] like Figure 1 As shown, in one embodiment, the delayed start circuit 100 further includes a pull-down resistor R6. The first end of the pull-down resistor R6 is connected to the control terminal of the first electronic switch Q1, and the second end of the pull-down resistor R6 is connected to the negative terminal of the aging chamber charging. In this embodiment, when the soft-start control circuit 10 is not connected to the aging chamber or is not powered on, the control terminal of the first electronic switch Q1 is forced to a low level due to the presence of the pull-down resistor R6, ensuring that the first electronic switch Q1 will not be accidentally turned on, thereby guaranteeing the safety and stability of the circuit. Simultaneously, since the pull-down resistor R6, together with the first voltage divider resistor R5 and the first delay capacitor C3, form a stable RC delay network, the risk of the first electronic switch Q1 being accidentally turned on due to external interference before reaching its turn-on threshold voltage is reduced, thereby improving the stability of the delayed start circuit 100.

[0037] like Figure 1As shown, in one embodiment, the relay control circuit 200 further includes a first current-limiting resistor R4. The first end of the first current-limiting resistor R4 is connected to the first end of the inductor coil of the power relay K1, and the second end of the first current-limiting resistor R4 is connected to the second end of the inductor coil of the power relay K1. In this embodiment, the positive terminal of the aging cabinet is connected to the first current-limiting resistor R4 via a step-down module. When the soft-start control circuit is connected to the aging cabinet and begins supplying power, current flows through the first current-limiting resistor R4 into the first end of the inductor coil of the power relay K1. Due to the presence of the first current-limiting resistor R4, the magnitude of the current flowing into the coil of the power relay K1 is limited, thereby avoiding the impact of a sudden large current on the power relay K1 and the entire circuit. Furthermore, when the first electronic switch Q1 is turned on, the positive terminal of the aging cabinet outputs DC power through the step-down module to the first current-limiting resistor R4, which then provides sufficient current to the coil of the power relay K1, generating sufficient electromagnetic force to close the normally open contacts of the relay, thereby ensuring that the relay control circuit 200 can operate normally.

[0038] like Figure 1 As shown, in one embodiment, the relay control circuit 200 further includes a light-emitting diode (LED). The positive terminal of the LED is connected to the second terminal of the first current-limiting resistor R4, and the negative terminal of the LED is connected to the second terminal of the inductor coil of the power relay K1. In this embodiment, when the external power supply starts supplying power and current flows into the coil of the power relay K1 through the first current-limiting resistor R4, the LED will be lit simultaneously. The lighting state of the LED directly reflects the energizing state of the coil of the power relay K1, that is, the closing state of the normally open contact of the relay. When the coil of the power relay K1 is energized and generates an electromagnetic field, causing the normally open contact to close and the pre-charging current-limiting resistor RT1 to be short-circuited, the LED remains continuously lit, indicating that the soft-start control circuit 10 has successfully completed the pre-charging stage and the charging circuit has become a direct connection. The LED provides the operator with an intuitive view of the circuit's operating status, thereby improving the operational convenience of the soft-start control circuit 10.

[0039] like Figure 1As shown, in one embodiment, the first electronic switch Q1 is an N-channel MOSFET. In this embodiment, the control terminal of the first electronic switch Q1 is the gate of the N-channel MOSFET and is connected to the second terminal of the first voltage divider resistor R5 to receive the delay signal from the RC delay circuit; the first terminal of the first electronic switch Q1 is the drain of the MOSFET and is connected to the second terminal of the inductor coil of the relay control circuit 200, and the second terminal of the first electronic switch Q1 is the source and is connected to the ground terminal. When the RC delay circuit starts working, the first delay capacitor C3 is gradually charged through the first voltage divider resistor R5, causing the gate voltage of the first electronic switch Q1 to rise slowly. Before the gate voltage reaches the threshold voltage of the N-channel MOSFET, the first electronic switch Q1 is in the off state, which is equivalent to a high-resistance switch, blocking the current path from the external power supply terminal to the coil of the power relay K1, thereby ensuring that the soft-start control circuit 10 can maintain a safe state in the initial stage of startup and avoiding the impact of instantaneous large current on the circuit. Specifically, as the first delay capacitor C3 continues to charge, the gate voltage of the first electronic switch Q1 gradually rises to exceed the threshold voltage of the MOSFET, causing the first electronic switch Q1 to turn on and form a low-resistance current path. The current from the external power supply can flow into the coil of the power relay K1 through the MOSFET, energizing the coil inside the power relay K1 to generate an electromagnetic field, which in turn drives the normally open contacts of the relay to close.

[0040] like Figure 1 As shown, in one embodiment, the power relay K1 is model HF16F / 12-HT. In this embodiment, the HF16F / 12-HT power relay K1 features a low pull-in voltage and a high release voltage threshold, meaning it can reliably pull in at low voltages and maintain stable contact even when the voltage drops, thus ensuring the stability and reliability of the soft-start control circuit 10. Furthermore, the HF16F / 12-HT power relay K1 also has a fast response time and low contact resistance, enabling instantaneous circuit switching and reducing current fluctuations caused by switching delays or poor contact, further protecting the battery protection board and battery from the impact of instantaneous high currents. Specifically, when the first electronic switch Q1 is turned on, the coil of the HF16F / 12-HT power relay K1 is energized, causing the pre-charge current-limiting resistor RT1, which is connected in parallel with the relay after the normally open contact is pulled in, to be short-circuited, thereby making the charging circuit a direct connection. At this point, since the pre-charging stage has been completed, the battery voltage is close to the charging voltage. The HF16F / 12-HT power relay K1 can stably maintain the normal operation of the circuit, thereby ensuring that the charging current flows smoothly into the positive terminal of the battery protection board.

[0041] A power battery comprises the soft start control circuit 10 of any one of the above. In the embodiment, before the charging starts, the normally open contact of the power relay K1 is in the off state, and at this time, the pre-charging current-limiting resistor RT1 is connected in series between the positive electrode of the aging cabinet and the positive electrode of the battery protection board, so that the pre-charging current-limiting resistor RT1 can limit the current size at the initial stage of charging and prevent the impact of the instantaneous large current on the battery protection board and the battery. When the soft start control circuit 10 is connected to the aging cabinet and starts to supply power, part of the current passes through the first voltage dividing resistor R5, and the other part of the current starts to charge the first delay capacitor C3. Since the control end of the first electronic switch tube Q1 is connected to the second end of the first voltage dividing resistor R5, the voltage gradually rises but has not yet reached the threshold voltage of the first electronic switch tube Q1, and the first electronic switch tube Q1 remains in the off state. As the voltage across the first delay capacitor C3 gradually rises, until the voltage at the control end of the first electronic switch tube Q1 is greater than the threshold voltage for conduction, the first electronic switch tube Q1 is turned on. After the first electronic switch tube Q1 is turned on, the current output by the external power supply flows into the first end of the inductor coil of the power relay K1, and the coil in the power relay K1 is energized to generate an electromagnetic field, so that the normally open contact of the relay is attracted to form a path and the pre-charging current-limiting resistor RT1 is short-circuited. Specifically, at the initial stage of charging of the aging cabinet, since the pre-charging current-limiting resistor RT1 functions to limit the peak current, the impact of the instantaneous large current on the battery protection board and the battery is prevented, so that the charging current gradually increases to the normal value within a period of time, rather than reaching the maximum value instantaneously. After the normally open contact of the power relay K1 is attracted and the pre-charging current-limiting resistor RT1 is short-circuited, the charging circuit becomes directly connected. At this time, since the pre-charging phase has been passed and the battery voltage has approached the charging voltage, no large instantaneous current will be generated, thereby ensuring that the battery protection board is not affected by the peak current.

[0042] Compared with the prior art, the present disclosure has at least the following advantages:

[0043] 1. The soft start control circuit 10 described above, since the RC delay circuit is used to control the delay conduction of the first electronic switch tube Q1, and the pre-charging current-limiting resistor RT1 is short-circuited after being turned on, the impact of the peak current on the battery protection board is effectively suppressed. Compared with the method of integrating a pre-charging circuit in the battery protection board, the soft start control circuit 10 as an external circuit can reduce the circuit design cost and simplify the implementation process, while improving the flexibility of the soft start control circuit 10.

[0044] The above-described embodiments are merely illustrative of several embodiments of the present disclosure, which are described in a more specific and detailed manner, but should not be construed as limiting the scope of the patent disclosure. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A soft start control circuit, characterized by, The soft start control circuit comprises a pre-charge current-limiting resistor, a delay start circuit and a relay control circuit. The relay control circuit comprises a power relay and a freewheeling diode. The pre-charge current-limiting resistor is connected to a positive electrode of the aging cabinet.

2. The soft start control circuit of claim 1, wherein, The delay start circuit further comprises a second voltage-dividing resistor.

3. The soft start control circuit of claim 2, wherein, The delay start circuit further comprises a second delay capacitor.

4. The soft start control circuit of claim 2, wherein, The delay start circuit further comprises a current-conducting diode.

5. The soft start control circuit of claim 1, wherein, The delay start circuit further comprises a pull-down resistor.

6. The soft start control circuit of claim 1, wherein, The relay control circuit further comprises a first current-limiting resistor.

7. The soft start control circuit of claim 6, wherein, The relay control circuit further comprises a light-emitting diode.

8. The soft start control circuit of claim 1, wherein, The first electronic switch is an N-channel MOS transistor.

9. The soft start control circuit of claim 1, wherein, The power relay is HF16F / 12-HT.

10. A power cell, characterized by The soft start control circuit comprises any one of claims 1 to 9.

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