CN214280958U - Storage battery pack sharing management device charge-discharge protection circuit - Google Patents
Storage battery pack sharing management device charge-discharge protection circuit Download PDFInfo
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- CN214280958U CN214280958U CN202022456103.2U CN202022456103U CN214280958U CN 214280958 U CN214280958 U CN 214280958U CN 202022456103 U CN202022456103 U CN 202022456103U CN 214280958 U CN214280958 U CN 214280958U
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Abstract
The utility model discloses a storage battery sharing management device charge-discharge protection circuit, including the control switch pipe that charges turn-off protection circuit include that diode D1 is parallelly connected with resistance R1, and diode D1's negative pole is connected to the RTN port of storage battery sharing management device, and diode D1's positive pole connects electric capacity C1, and electric capacity C1 connects each battery port that the diode D1's link is connected to storage battery sharing management device respectively through the reversal diode; the discharge control switch tube turn-off protection circuit comprises a resistor R2 and a capacitor C2 which are connected in parallel, wherein one end of the resistor R2 and one end of the capacitor C2 are connected with a power supply port of the storage battery pack sharing management device, and the other end of the resistor R2 and the other end of the capacitor C2 are connected with each battery port of the storage battery pack sharing management device through a forward diode respectively. The utility model discloses when carrying out the charge-discharge management to storage battery, can ensure that semiconductor switching device is in safe workspace, still can reduce semiconductor switching device's switching loss simultaneously, reduce semiconductor device junction temperature and consumption and generate heat, improved battery sharing management device's stability and reliability.
Description
Technical Field
The utility model relates to a battery management technical field, concretely relates to storage battery sharing management device charge-discharge protection circuit.
Background
At present, storage batteries are widely used in various industries as main sources of power supplies and backup power supplies. The single batteries are limited by the voltage and the capacity of the batteries, and are difficult to be applied independently in many occasions, and in order to obtain a power supply with higher power and higher voltage, a plurality of single batteries are often required to be connected in series to form a group, and a plurality of groups of batteries are used in parallel.
A plurality of groups of storage batteries (difference storage battery sets for short) of different types, different manufacturers, different batches, different periods and different models cannot be directly connected in parallel for use due to the difference of the charge and discharge performances such as the capacity, the float charge voltage, the average charge voltage, the charge rate and the like of the storage batteries, otherwise, the performance of the storage batteries is sharply reduced, and the stability and the service life of the storage batteries are greatly reduced.
In recent years, in order to solve the problem of parallel use of the differential storage battery pack, a storage battery pack sharing management device (as shown in fig. 1) is provided, which manages the parallel operation of the differential storage battery pack by connecting one or two high-power switching tubes in reverse series at the output end of each group of cells and combining a control unit. The circuit of one switch tube can manage the charging process of the differential storage battery pack, and the circuit of two switch tubes which are connected in series in reverse can manage the charging and discharging processes of the differential storage battery pack.
When the battery pack sharing management device is used in a communication base station, the battery pack sharing management device is generally installed at a position close to a battery pack inside a battery rack or in a machine room, however, the battery pack cabinet is far away from a power cabinet along with continuous capacity expansion of the base station, the connecting cable of the battery pack even exceeds more than 10 meters, the stray inductance of a cable loop at the moment can not be ignored, the switch tube is in the charge and discharge control process, the stray inductance not only can seriously deteriorate the turn-off process of the switch tube, but also the energy stored in the inductance can not be rapidly released when the switch tube is turned off, and the switch tube can be caused to exceed the safe working area of a device and be burnt and damaged.
In addition, because the turn-off protection circuit is not arranged, di/dt is very large when the device is turned off, and very high overvoltage can appear at two ends of the switching tube, even if the safety voltage of the device is not exceeded, the switching tube bears large current and high voltage at the turn-off moment, so that very large switching loss is caused, and overheating and high temperature are still caused by the excessively large switching loss, so that the safety operation of equipment is still damaged.
In order to meet the application scenario that the distance between the storage battery pack and the power cabinet is relatively long, ensure that devices are located in a safe working area, and reduce the switching loss of the storage battery pack sharing management device, a protection circuit suitable for the storage battery pack sharing management device is urgently needed, the effective and reliable control of the charging and discharging processes of the storage battery pack is realized, the equipment loss is reduced, and the standby power utilization efficiency of the storage battery is improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of storage battery sharing management device charge-discharge protection circuit can improve the reliability of group battery sharing management device, reduces switching loss, improve equipment's efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a charging and discharging protection circuit of a storage battery pack sharing management device comprises a charging control switch tube, a discharging control switch tube, a charging control switch tube turn-off protection circuit, a discharging control switch tube turn-off protection circuit, a battery port, a power supply port and the like.
The charging control switch tube and the discharging control switch tube are both power MOSFET, and parasitic diodes which are connected in parallel in an opposite direction are integrated between drain and source electrodes. The charging control switch tube and the discharging control switch tube are connected in series in an opposite direction, namely, the source electrodes S or the drain electrodes D of the two switch tubes are connected together, one end of the switch tube which is connected in series in the opposite direction is connected with one battery port of the storage battery sharing management device, the other end of the switch tube is connected to a power supply port, the battery port is connected to the negative electrode output end of the storage battery pack through a cable, and the power supply port is connected to the negative electrode busbar of the rectifying power supply through a cable. When multiple groups of difference storage battery packs are connected in parallel and shared, each group of storage battery packs needs to be connected with a group of charging control switch tubes and discharging control switch tubes.
The turn-off protection circuit of the charge control switch tube is composed of a diode, a resistance element and a capacitance element, and specifically comprises the following steps: the diode D1 is connected in parallel with the resistor R1, the cathode of the diode D1 is connected to a positive busbar of the rectified power supply through a cable, the anode of the diode D1 is connected with the capacitor C1, the connection end of the capacitor C1 and the diode D1 is connected to a battery port of the storage battery pack common management device through a reverse diode, and the other end of the capacitor C1 is connected to a power supply port of the storage battery pack common management device. Taking a two-port storage battery sharing management device as an example, two groups of differential storage batteries can be managed to run in parallel, a first battery port is connected with the anode of the diode D2, a second battery port is connected with the anode of the diode D4, and the cathode of the diode D2 and the cathode of the diode D4 are connected to the connection end of the capacitor C1 and the diode D1.
The discharge control switch tube turn-off protection circuit is composed of a diode, a resistance element and a capacitance element, and specifically comprises the following steps: the resistor R2 and the capacitor C2 are connected in parallel, one end of the parallel connection is connected with a power supply port of the storage battery pack sharing management device, and the other end of the parallel connection is connected with each battery port of the storage battery pack sharing management device through a diode. Taking a two-port storage battery sharing management device as an example, two groups of differential storage batteries can be managed to run in parallel, a first battery port is connected with the cathode of a diode D3, a second battery port is connected with the cathode of a diode D5, and the anode of a diode D3 and the anode of a diode D5 are connected with the parallel output end of a resistor R2 and a capacitor C2.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) a storage battery management device charge-discharge protection circuit that shares, when storage battery management device that shares carries out charge-discharge management to the battery, can ensure that semiconductor switch device is in safe workspace, avoid turn-off the damage, improved storage battery management device that shares's reliability, further improved the security and the stability that the battery was equipped with the electric system.
2) A storage battery management device charge-discharge protection circuit that shares, can reduce semiconductor switch device's switching loss, reduced generating heat of equipment, improved the efficiency of battery management device that shares, further improved the reserve electricity availability factor of battery.
3) A storage battery management device charge-discharge protection circuit that shares, can be applied to battery cabinet and power cabinet apart from the application scene far away, promoted battery sharing management device's range of application.
Drawings
Fig. 1 is a schematic diagram of a conventional secondary battery pack sharing management apparatus;
fig. 2 is a working principle diagram of a first embodiment of the present invention;
fig. 3 is a working principle diagram of the second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
The first implementation example is as follows:
referring to fig. 2, the charging and discharging protection circuit of the storage battery pack sharing management device and the system working principle diagram thereof comprise a rectification power supply 1, a load 2, a storage battery pack sharing management device 3, a first storage battery pack 4, a second storage battery pack 5, a line inductor 9, a line inductor 10, a line inductor 11, a line inductor 12, a line inductor 13 and the like.
The charging and discharging protection circuit of the storage battery pack sharing management device 3 comprises a first charging control switch tube T2, a first discharging control switch tube T1, a second charging control switch tube T4, a second discharging control switch tube T3, a charging control switch tube turn-off protection circuit, a discharging control switch tube turn-off protection circuit, a first battery port 6, a second battery port 7, a power supply port 8, an RTN port 14 and the like.
The charging control switch tube and the discharging control switch tube are both power MOSFET, and parasitic diodes which are connected in parallel in an opposite direction are integrated between drain and source electrodes. The charging control switch tube and the discharging control switch tube are connected in series in a common drain electrode (common D pole) reverse direction, namely, the drain electrodes D of the two switch tubes are connected together, one end of the switch tube after being connected in series in the reverse direction is connected with one battery port of the storage battery sharing management device, the other end of the switch tube is connected with a power supply port, the battery port is connected to the negative electrode output end of the storage battery through a cable, and the power supply port is connected to the negative electrode busbar of the rectification power supply through a cable. When multiple groups of difference storage battery packs are connected in parallel and shared, each group of storage battery packs needs to be connected with a group of charging control switch tubes and discharging control switch tubes. As a first embodiment, taking a two-port storage battery sharing management device as an example, the first storage battery 4 is connected to the first battery port 6 of the storage battery sharing management device 3 through a cable, the first battery port 6 is connected to the source S of the first discharge control switch T1, the first discharge control switch T1 and the first charge control switch T2 are connected in common drain, and the source S of the first charge control switch T2 is connected to the power supply port 8 of the storage battery sharing management device 3; the second battery pack 5 is connected to a second battery port 7 of the battery pack sharing management device 3 through a cable, the second battery port 7 is connected with a source electrode S of a second discharge control switch tube T3, the second discharge control switch tube T3 and a second charge control switch tube T4 are in common drain connection, and the source electrode S of the second charge control switch tube T4 is connected with a power supply port 8 of the battery pack sharing management device 3.
The turn-off protection circuit of the charge control switch tube is composed of a diode, a resistance element and a capacitance element, and specifically comprises the following steps: the diode D1 is connected in parallel with the resistor R1, the cathode of the diode D1 is connected to the positive busbar of the rectified power supply through a cable, the anode of the diode D1 is connected with the capacitor C1, the connection end of the capacitor C1 and the diode D1 is connected to each battery port of the storage battery pack common management device 3 through a reverse diode, and the other end of the capacitor C1 is connected to the power supply port of the storage battery pack common management device 3. Taking a two-port storage battery sharing management device as an example, two groups of differential storage batteries can be managed to run in parallel, a first battery port 6 is connected with the anode of a diode D2, a second battery port 7 is connected with the anode of a diode D4, and the cathode of a diode D2 and the cathode of a diode D4 are connected to the connection end of a capacitor C1 and a diode D1.
The discharge control switch tube turn-off protection circuit is composed of a diode, a resistance element and a capacitance element, and specifically comprises the following steps: the resistor R2 and the capacitor C2 are connected in parallel, one end of the parallel connection is connected with the power supply port 8 of the storage battery pack sharing management device 3, and the other end is connected with each battery port of the storage battery pack sharing management device 3 through a direct connection diode. Taking a two-port storage battery sharing management device as an example, two groups of differential storage batteries can be managed to run in parallel, a first battery port 6 is connected with the cathode of a diode D3, a second battery port 7 is connected with the cathode of a diode D5, and the anode of a diode D3 and the anode of a diode D5 are connected with the parallel output end of a resistor R2 and a capacitor C2.
The working principle of the charge and discharge protection circuit of the storage battery pack sharing management device of the present invention is described in detail below by using the circuit schematic diagram shown in fig. 2:
when the commercial power is normal, the rectifying power supply 1 supplies power to the load 2, and meanwhile, the storage battery pack is charged through the storage battery pack sharing management device 3. In the charging stage of the storage battery packs, the synchronous equalizing charging or asynchronous grouping charging of each group of storage batteries can be controlled by adjusting the on-off of each charging control switch tube in each storage battery pack sharing management device 3. If the first storage battery pack 4 is normally charged, the first discharge control switch tube T1 keeps the on state, and the on/off of the first charge control switch tube T2 is controlled by outputting a PWM signal to adjust the charging current of the first storage battery pack 4; when the first storage battery pack reaches the set charging voltage, the first charging control switch tube T2 needs to be turned off, the charging of the first storage battery pack 4 is stopped, but the first discharging control switch tube T1 is kept on, and the discharging loop of the storage battery pack is kept smooth.
In the charging stage of the storage battery pack, when the first charging control switch tube T2 is in an on state, the charging current of the first storage battery pack 4 is output from the positive electrode of the rectification power supply 1, and sequentially passes through the first storage battery pack 4, the first battery port 6, the first discharging control switch tube T1, the first charging control switch tube T2 and the power supply port 8 to return to the negative electrode of the rectification power supply 1; meanwhile, the positive electrode of the rectification power supply also charges a capacitor C1 through an RTN port and a resistor R1, and the voltage at the two ends of the capacitor C1 is the output voltage of the rectification power supply. When the first charging control switch tube T2 is turned off, the equivalent resistance of the drain-source electrode of the power MOSFET is increased, the voltage of the drain-source electrode is increased, and simultaneously, the charging control switch tube T2 is chargedThe sudden change of the current will generate an induced voltage u across the cable line inductances L1, L2, L3L＝(L1+L2+L3)dichDt, the line inductance energy storage at the moment of turn-off is WL＝(L1+L2+L3)I2/2. The longer the distance between the battery cabinet and the power cabinet and between the battery pack and the storage battery pack sharing management device is, the longer the cable is, the larger the line inductance is, the larger the energy storage of the line inductance is, and the larger the generated induction voltage is; the larger the charging current is, the larger the line inductance energy storage is, the larger the current change rate is, and the larger the generated induced voltage is. If do not have the turn-off protection circuit that charges, turn-off and lead to the whole switch tubes that flow through of circuit inductance energy storage because of first charging control switch tube T2 turn-offs, will lead to the switch tube overheated to burn out certainly, thereby damage the switch tube, even the circuit is shorter, under the less condition of inductance, because induced voltage's existence, turn-off moment switch tube bears heavy current and high voltage simultaneously and has very big switching loss, too big switching loss also can arouse overheated, high temperature, the work efficiency of equipment has not only been reduced, also the safe operation of equipment is endangered still. After having set up the charge-discharge protection circuit, during the shutoff of the charge control switch tube, along with the increase of the voltage between the drain and the source of the first charge control switch tube, and the induced voltage produced by the line inductance leads to the voltage of the first battery port 6 also increasing in the twinkling of an eye, diode D1 switches on, the charging current flows through C1 through D1, diode D3 switches on simultaneously, the charging current flows back to the positive pole of the rectification power supply through D3, because diode D1 and D3 switch on, the voltage of the first battery port 6 is clamped to the positive output voltage of the rectification power supply, ensure that the voltage at both ends of the switch tube is in the safe working interval during the shutoff; meanwhile, due to the conduction and the shunt of the D1, the charging current flowing through the first charging control switch tube T2 is rapidly reduced, and only a small current flows through the switch tube during the turn-off period, so the turn-off loss of the switch tube is greatly reduced. When the turn-off process of the first charge control switch tube T2 is finished, the energy stored in the line inductor continues to discharge through the diodes D1, D3 and the capacitor C1 until the current is 0, then the diodes D1 and D3 are cut off, and the voltage across the terminals C1 is restored to the output voltage of the rectification power supply. Charging of second battery pack 5The electrical control protection process is similar.
When the commercial power is cut off, each storage battery pack discharges to the load 2 through the storage battery pack sharing management device 3. In the discharging stage of the storage battery packs, the synchronous balanced discharge or asynchronous grouped discharge of each group of storage batteries can be controlled by adjusting the on-off of each discharge control switch tube in each storage battery pack common management device 3. If the first battery pack 4 discharges normally, the first charge control switch tube T2 keeps on state, and the on/off of the first discharge control switch tube T1 is controlled by outputting a PWM signal to adjust the discharge current of the first battery pack 4; when the first storage battery pack reaches the set discharge termination voltage, the first discharge control switch tube T1 needs to be turned off to stop discharging the first storage battery pack 4, but the first charge control switch tube T2 is kept on to ensure that the charge loop of the storage battery pack is kept open.
In the discharging stage of the storage battery pack, when the first discharging control switch tube T1 is in an on state, the discharging current of the first storage battery pack 4 is output from the positive electrode of the first storage battery pack 4, and returns to the negative electrode of the first storage battery pack through the load 2, the power supply port 8, the first charging control switch tube T2, the first discharging control switch tube T1, and the first battery port 6 in sequence. When the first discharge control switch tube T1 is turned off, the drain-source equivalent resistance of the power MOSFET increases, the drain-source voltage also increases, and due to the sudden change of the discharge current, an induced voltage u will be generated across the cable line inductors L1, L2, and L3L＝(L1+L2+L3)didischAnd/dt. Similar to the case of the charging phase, the line inductance stores energy as W at the moment of turn-offL＝(L1+L2+L3)I2The farther the battery cabinet, the power supply cabinet and the storage battery pack share the management device, the longer the cable is, the larger the line inductance is, the larger the energy storage of the line inductance is, and the larger the generated induction voltage is; the larger the discharge current is, the larger the line inductance energy storage is, the larger the current change rate is, and the larger the generated induced voltage is. If there is no discharge turn-off protection circuit, the first discharge control switch tube T1 turns off to cause the stored energy of the line inductor to flow through the switch tube, which will lead to the switch tube being burnt by overheat, thereby damaging the switchEven if the circuit is short and the inductance is small, due to the existence of induction voltage, the switch tube bears large current and high voltage at the moment of turn-off, so that great switching loss is caused, and the excessive switching loss causes overheating and high temperature, so that the working efficiency of the equipment is reduced, and the safe operation of the equipment is still damaged.
After having set up the charge-discharge protection circuit, in the turn-off period of the discharge control switch tube, along with the increase of the voltage between the drain and the source of the first discharge control switch tube, and the induced voltage generated by the line inductance leads to the instantaneous increase of the voltage of the power port 8, the diode D3 is turned on, the discharge current flows back through the C2 and the D3, and returns to the negative pole of the first storage battery pack 4 through the first battery port 6, the C2 also limits the sudden change of the voltage at the two ends of the switch tube at the same time, and the voltage at the two ends of the switch tube is ensured to be in the safe working interval during the turn-off period; meanwhile, due to the conduction of the D3 and the shunt of the C2, the discharge current flowing through the first discharge control switch tube T1 is rapidly reduced, only a small current flows through the switch tube during the turn-off period, and therefore the turn-off loss of the switch tube is greatly reduced. After the turn-off process of the first discharge control switch tube T1 is finished, the energy stored in the line inductor continues to discharge through the capacitor C2 and the diode D3 until the current is 0, and then the voltage across the capacitor C2, which is increased by the discharge current charging the capacitor C2, is further discharged to 0 through the resistor R2. The discharge control protection process of second battery pack 5 is similar.
From an analysis of the working process of the above embodiment example, it can be seen that:
a storage battery management device charge-discharge protection circuit that shares, when storage battery management device that shares carries out charge-discharge management to the battery, can be applied to battery cabinet and power cabinet apart from the application scene far away, can ensure that semiconductor switch device is in safe workspace, avoid excessive pressure to puncture, still can reduce semiconductor switch device's switching loss simultaneously, reduce generating heat of equipment, the conversion efficiency of storage battery management device that shares has been improved, the reliability of device has been promoted, the security and the stability of battery backup power system have further been improved.
Example two was performed:
referring to fig. 3, the charging and discharging protection circuit for the storage battery pack sharing management device and the system working principle diagram thereof comprise a rectification power supply 1, a load 2, a storage battery pack sharing management device 3, a first storage battery pack 4, a second storage battery pack 5, a line inductor 9, a line inductor 10, a line inductor 11, a line inductor 12, a line inductor 13 and the like.
The charging and discharging protection circuit of the storage battery pack sharing management device 3 comprises a first charging control switch tube T1, a first discharging control switch tube T2, a second charging control switch tube T3, a second discharging control switch tube T4, a charging control switch tube turn-off protection circuit, a discharging control switch tube turn-off protection circuit, a first battery port 6, a second battery port 7, a power supply port 8, an RTN port 14 and the like.
The charging control switch tube and the discharging control switch tube are both power MOSFET, and parasitic diodes which are connected in parallel in an opposite direction are integrated between drain and source electrodes. The difference between the second embodiment and the first embodiment is that: in the first embodiment, the charge control switch tube and the discharge control switch tube are connected in series in reverse with a common drain (common D pole), that is, the drains D of the two switch tubes are connected together, while in the second embodiment, the charge control switch tube and the discharge control switch tube are connected in series in reverse with a common source (common S pole), that is, the sources S of the two switch tubes are connected together.
To sum up, the utility model provides a pair of storage battery sharing management device charge-discharge protection circuit when carrying out charge-discharge management to storage battery, can ensure that semiconductor switching device is in safe workspace, still can reduce semiconductor switching device's switching loss simultaneously, reduces semiconductor device junction temperature and consumption and generates heat, has improved storage battery sharing management device's stability and reliability.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. A charging and discharging protection circuit of a storage battery pack sharing management device comprises a storage battery pack sharing management device (3), a charging control switch tube turn-off protection circuit and a discharging control switch tube turn-off protection circuit;
the method is characterized in that: the turn-off protection circuit of the charge control switch tube comprises a diode D1 and a resistor R1 which are connected in parallel, the cathode of the diode D1 is connected to an RTN port (14) of the storage battery pack sharing management device (3), the RTN port (14) is connected to a positive busbar of a rectification power supply through a cable, the anode of the diode D1 is connected with a capacitor C1, the connecting end of the capacitor C1 and a diode D1 is respectively connected to each battery port of the storage battery pack sharing management device (3) through a reverse diode, and the other end of the capacitor C1 is connected to a power supply port (8) of the storage battery pack sharing management device (3);
the discharge control switch tube turn-off protection circuit comprises a resistor R2 and a capacitor C2 which are connected in parallel, one end of the parallel connection is connected with a power supply port (8) of the storage battery pack sharing management device (3), and the other end of the parallel connection is connected with each battery port of the storage battery pack sharing management device (3) through a forward diode.
2. The charging and discharging protection circuit of the storage battery pack sharing management device according to claim 1, characterized in that:
when the storage battery pack sharing management device (3) is provided with two ports, the charging control switch tube turn-off protection circuit can manage two groups of differential storage battery packs to run in parallel, the first battery port (6) is connected with the anode of the diode D2, the second battery port (7) is connected with the anode of the diode D4, and the cathode of the diode D2 and the cathode of the diode D4 are connected with the connecting end of the capacitor C1 and the diode D1.
3. The charging and discharging protection circuit of the storage battery pack sharing management device according to claim 1, characterized in that:
when the storage battery pack sharing management device is provided with two ports, the discharge control switch tube turn-off protection circuit can manage two groups of differential storage battery packs to run in parallel, a first battery port (6) is connected with the cathode of a diode D3, a second battery port (7) is connected with the cathode of a diode D5, and the anode of a diode D3 and the anode of a diode D5 are connected with the parallel output end of a resistor R2 and a capacitor C2.
4. The charging and discharging protection circuit of the storage battery pack sharing management device according to claim 1, characterized in that:
the storage battery pack sharing management device (3) comprises a charging control switch tube and a discharging control switch tube;
the charging control switch tube and the discharging control switch tube are both power MOSFET, and parasitic diodes which are connected in parallel in an opposite direction are integrated between drain and source electrodes;
the charging control switch tube and the discharging control switch tube are reversely connected in series, namely the source electrodes S or the drain electrodes D of the two switch tubes are connected together, one end of the switch tube which is reversely connected in series is connected with one battery port of the storage battery group sharing management device (3), the other end of the switch tube is connected with a power supply port (8), the battery port is connected to the negative electrode output end of the storage battery group through a cable, and the power supply port is connected to a negative electrode bus bar of the rectification power supply through a cable;
when a plurality of groups of difference storage battery packs are connected in parallel and shared, the negative output end of each group of storage battery packs needs to be connected with a group of charging control switch tubes and discharging control switch tubes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022456103.2U CN214280958U (en) | 2020-10-28 | 2020-10-28 | Storage battery pack sharing management device charge-discharge protection circuit |
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| CN202022456103.2U CN214280958U (en) | 2020-10-28 | 2020-10-28 | Storage battery pack sharing management device charge-discharge protection circuit |
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| CN214280958U true CN214280958U (en) | 2021-09-24 |
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