CN117118001A

CN117118001A - Charging and discharging system with long service life and energy storage device

Info

Publication number: CN117118001A
Application number: CN202211402761.0A
Authority: CN
Inventors: 李伯才
Original assignee: Ningbo Bobao Energy Technology Co ltd
Current assignee: Ningbo Bobao Energy Technology Co ltd
Priority date: 2022-02-14
Filing date: 2022-11-09
Publication date: 2023-11-24
Also published as: CN117118000A; CN117254544A; CN117254543A

Abstract

The invention provides a charge and discharge system with long service life and an energy storage device, wherein the charge and discharge system comprises: the plurality of branch circuits are arranged in parallel and are used for electrically and communicatively connecting a plurality of battery packs; at least one first voltage regulating module electrically connected with the branch circuit; the first voltage regulating module is used for regulating the voltage input by the battery pack into a first preset direct-current voltage; the alternating current and direct current conversion module is electrically connected with at least one first voltage regulation module. The invention solves the technical problem that a plurality of battery packs in a charging and discharging device are arranged in parallel, so that the battery packs with high voltage are easy to charge the battery packs with low voltage reversely due to different voltages of the battery packs in the discharging process.

Description

Charging and discharging system with long service life and energy storage device

Technical Field

The invention relates to the technical field of charging and discharging, in particular to a long-service-life charging and discharging system and an energy storage device.

Background

There are at least one of the following problems in the related art: the plurality of battery packs in the charging and discharging device are arranged in parallel, so that in the discharging process, the battery packs with high voltage are easy to reversely charge the battery packs with low voltage due to different voltages of the battery packs, the overall charging efficiency is influenced, and the spontaneous combustion is easy to occur.

Disclosure of Invention

The invention solves the technical problem that a plurality of battery packs in a charging and discharging device are arranged in parallel, so that the battery packs with high voltage are easy to charge the battery packs with low voltage reversely due to different voltages of the battery packs in the discharging process.

In order to solve the above problems, the present invention provides a long-life charge and discharge system, comprising: a plurality of branch circuits, each of which is arranged in parallel between the branch circuits and is used for electrically and communicatively connecting a plurality of battery packs; at least one first voltage regulation module, which is electrically connected with the branch circuit correspondingly; the first voltage regulating module is used for regulating the voltage input by the battery pack into a first preset direct-current voltage; the alternating current and direct current conversion module is electrically connected with the at least one first voltage regulation module; when the charging and discharging system is in a discharging state, the first voltage regulating module inputs the first preset direct current voltage into the alternating current and direct current conversion module, and the alternating current and direct current conversion module outputs alternating current voltage to electric equipment.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the first direct current voltage output by the battery packs is regulated to be the first preset direct current voltage through the first voltage regulating module, and as the first voltage regulating module is arranged on each branch circuit, the voltages of the branch circuits participating in the discharging process at the terminals of the branch circuits are identical, namely the voltages transmitted to the alternating current and direct current conversion modules by each first voltage regulating module are kept identical, and the situation that a plurality of battery packs are reversely charged when the direct currents input by the input ends of the branch circuits electrically connected with the battery packs meet at the terminals is avoided. In addition, it can be understood that the service life of the battery pack is inversely related to the charge and discharge times in the normal use process, that is, the more the charge and discharge times are, the shorter the service life of the battery pack is, so that the service life of the battery pack can be prolonged by adopting the technical scheme.

In one example of the present invention, it comprises: and the current regulating unit is arranged on the branch circuit and is used for regulating the current input into the battery pack electrically connected with the branch circuit.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: for example, when the charge and discharge system is in a charge state, the current on the branch circuit can be regulated by the current regulating unit to be matched with the corresponding battery pack, so that each battery pack is charged in a state of keeping the maximum charge power, and further, the external multiple battery packs can be rapidly filled in a short time, and the charge efficiency is improved; in addition, because the capability of the maximum current which can be born by each battery pack is different, the condition that the battery packs are burnt out due to the fact that the battery packs are charged by different battery packs with the same charging current is avoided, and even a charging and discharging system is damaged.

In one example of the present invention, it comprises: the information acquisition module is electrically connected with the branch circuit and is used for acquiring a corresponding working state signal of the battery pack; the control module is electrically connected with the information acquisition module and controls the current regulating unit to convey safety current to the corresponding battery pack according to the working state information; and the safety current is smaller than or equal to the maximum charging current of the battery pack.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the maximum total power of charging is ensured, the charging efficiency is improved, and the charging process is safe and reliable.

In one example of the present invention, it comprises: one end of the first output circuit is electrically connected with the output port of the alternating current and direct current conversion module, and the other end of the first output circuit is provided with a first output port electrically connected with the electric equipment; one end of the first input circuit is electrically connected with the input port of the alternating current and direct current conversion module, and the other end of the first input circuit is provided with a first input port electrically connected with power supply equipment; the signal identification unit is electrically connected to the first input circuit, and when the first input port is identified to be electrically connected with the power supply equipment, the signal identification unit sends a first signal to the alternating current and direct current conversion module; the regulating circuit is electrically connected with the first output circuit and the first input circuit, and when the power supply equipment is electrically connected with the first input port, the regulating circuit divides the current input by the power supply equipment into a first current input into the first output circuit and a second current output by the first output port; when the control module acquires the first signal, the control module controls to disconnect the second output circuit which is output by the first voltage regulating module to the direction of the alternating current and direct current conversion module.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the charging and discharging system is connected to the power supply equipment at the first input port or not, power can be supplied to the electric equipment uninterruptedly, the service efficiency of the charging and discharging system is improved, the fine control of discharging the battery pack is realized, frequent discharging of the battery pack is avoided, the service life of the battery pack is prolonged, and the use cost of the whole equipment is reduced to a certain extent.

In one example of the present invention, it comprises: one end of the second direct current bypass is electrically connected to a second output circuit for outputting direct current to the alternating current and direct current conversion module by the first voltage regulation module, and the other end of the second direct current bypass is electrically connected with a second direct current output port; the second direct current output port is used for being electrically connected with direct current electric equipment.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: through setting up the second direct current bypass, can improve charge-discharge system's use commonality, also can make the battery package not only supply power for exchanging the consumer through charge-discharge system promptly, can also supply power for the direct current consumer.

In one example of the present invention, the first input port includes: a first direct current input port for inputting direct current into the first input circuit; and/or a first alternating current input electric port is used for inputting alternating current into the first input circuit.

Compared with the prior art, the technical scheme has the following technical effects that: combining the actual conditions.

In one example of the present invention, the second dc bypass includes: and the voltage transformation circuit is used for increasing or decreasing the direct-current voltage output to the electric equipment by the first voltage module.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the voltage of the first direct current voltage can be adjusted to be suitable for the rated voltage of the direct current electric equipment, and the voltage of the first direct current voltage can be reduced through a voltage transformation circuit, so that the power can be supplied to the small direct current electric equipment, and the small direct current electric equipment can be a small lighting lamp and the like.

In one example of the present invention, it comprises: a third DC bypass, one end of which is electrically connected with the corresponding branch circuit, and the other end of which is electrically connected with the second DC input port; the second direct current input port is used for being electrically connected with direct current power supply equipment.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the usability of the charging and discharging system is greatly improved, namely, the charging and discharging system can be powered by the battery packs of the alternating current power supply equipment and the direct current power supply equipment.

In one example of the present invention, when the charge-discharge system is in a charged state, the dc current output by the ac-dc conversion module to the first voltage adjustment module satisfies that the battery pack is charged at a rate of 0.5C or more.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: so that charging efficiency is ensured.

In one example of the present invention, the total discharge power of the ac-to-dc conversion module for discharging the battery pack is greater than the total charge power for charging the battery pack.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: so that the discharging efficiency of the battery pack controlled by the charging and discharging system is greater than the charging efficiency.

In another aspect, the present invention also provides an energy storage device, including: a charge-discharge system as described in any one of the above examples; the installation shell is internally provided with an installation space for installing a charging and discharging system; at least one battery pack detachably provided outside the mounting portion of the mounting housing; wherein the mounting portion is provided with a terminal for electrically connecting the battery pack with the charge-discharge system.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the technical effects corresponding to any one of the above technical schemes can be achieved, and will not be repeated here. In addition, the energy storage device can be a product convenient to carry, so that the battery pack can be charged by the energy storage device in an outdoor place inconvenient to receive commercial power, and the battery pack can be used in different electric tools, and the use universality of the energy storage device is greatly improved.

After the technical scheme of the invention is adopted, the following technical effects can be achieved:

(1) The first direct current voltage output by the battery packs is regulated to be the first preset direct current voltage through the first voltage regulating module, and as the first voltage regulating module is arranged on each branch circuit, the voltages of the branch circuits participating in the discharging process at the terminals of the branch circuits are identical, namely the voltages transmitted to the alternating current and direct current conversion modules by each first voltage regulating module are kept identical, and the situation that a plurality of battery packs are reversely charged when the direct currents input by the input ends of the branch circuits electrically connected with the battery packs meet at the terminals is avoided. In addition, it can be understood that the service life of the battery pack is inversely related to the charge and discharge times in the normal use process, that is, the more the charge and discharge times are, the shorter the service life of the battery pack is, so that the effect of prolonging the service life of the battery pack can be realized by the technical scheme;

(2) The charging and discharging system can supply power to electric equipment uninterruptedly no matter whether the first input port is connected with the power supply equipment or not, so that the service efficiency of the charging and discharging system is improved, the fine control of discharging the battery pack is realized, frequent discharging of the battery pack is avoided, the service life of the battery pack is prolonged, and the use cost of the whole equipment is reduced to a certain extent;

(3) The usability of the charging and discharging system is greatly improved, namely, the charging and discharging system can be powered by the battery packs of the alternating current power supply equipment and the direct current power supply equipment.

Drawings

Fig. 1 is a schematic diagram of module connection of a charge-discharge system with a long service life according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of module connection of another charge-discharge system.

Fig. 3 is a schematic diagram of module connection of another charge-discharge system.

Fig. 4 is a schematic diagram of module connection of another charge-discharge system.

Fig. 5 is a schematic diagram of module connection of another charge-discharge system.

Reference numerals illustrate:

10-a charge-discharge system; 100-battery pack; 1-a branch circuit; 200-a current regulating unit; 301 a-a first voltage regulation module; 302 a-an alternating current and direct current conversion module; 303-output port; 304-an input port; 305-a first output port; 306-a first input port; 310-a first output circuit; 320-a first input circuit; 330-a second dc bypass; 340-a second output circuit; 350-a second input circuit; 400-a voltage transformation circuit; 40-a second dc output port; 500-adjusting circuit; 50-a second dc input port; 600-solar cell.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

Embodiment one:

referring to fig. 1, a schematic block diagram of a long-life charge-discharge system 10 according to a first embodiment of the present invention is shown. The charge-discharge system 10 includes, for example, a plurality of branch circuits 1, at least one first voltage regulation module 301a, and an ac-to-dc conversion module 302a. Each of the branch circuits 1 is arranged in parallel, and the branch circuits 1 are used for electrically and communicatively connecting a plurality of battery packs 100; the first voltage adjusting module 301a is correspondingly and electrically connected with the branch circuit 1, and the first voltage adjusting module 301a is used for adjusting the voltage input by the battery pack 100 into a first preset direct current voltage; the ac-to-dc conversion module 302a is electrically connected to the at least one first voltage regulation module 301 a; when the charging and discharging system 10 is in a discharging state, the first voltage adjusting module 301a inputs a first preset dc voltage to the ac-dc conversion module, and the ac-dc conversion module outputs an ac voltage to the electric device.

For example, the first voltage adjusting module 301a may be an integrated voltage adjusting module, and the single integrated voltage adjusting module completes the electrical connection to the plurality of branch circuits 1, so as to control the situation that the plurality of battery packs 100 are not mutually charged in the discharging process, and specifically, the integrated voltage adjusting module is internally provided with voltage adjusting units paired with each branch circuit 1 one by one, so that the battery packs 100 electrically connected to each branch circuit 1 are respectively adjusted to the first preset direct current voltages with the same size, thereby avoiding the situation that the battery packs 100 participating in the discharging process are mutually charged, and further improving the discharging efficiency of the charging and discharging system.

With continued reference to fig. 1, in one embodiment, when the charge and discharge system 10 is electrically connected to at least one battery pack 100, when the charge and discharge system 10 is not connected to the electric power supply, the battery pack 100 supplies power to the electric device under the action of the charge and discharge system 10, that is, the battery pack 100 is in a discharge state. Specifically, the battery pack 100, for example, releases a dc voltage with a first dc voltage, which is received by the first voltage adjusting module 301a electrically connected to the battery pack, at this time, the first voltage adjusting module 301a adjusts the first dc voltage to a first preset dc voltage, and then the ac-dc converting module 302a electrically connected to the first voltage adjusting module 301a receives a dc power with the first preset dc voltage, and converts the dc power into an ac power adapted to an external electric device, thereby completing a power supply process to the electric device.

Further, it will be appreciated that since the plurality of branch circuits 1 are arranged in parallel with each other, when the number of the battery packs 100 is smaller than the number of the branch circuits 1 electrically connected thereto, the branch circuits 1 not electrically connected to the battery packs 100 may be regarded as open circuits, that is, the branch circuits 1 do not participate in the above-described discharging process. In combination with the actual discharging process, since the specification of each battery pack 100 is not necessarily the same, and since it is difficult to ensure that the discharging condition of each battery pack 100 is the same in the discharging process, when a plurality of battery packs 100 are arranged in parallel with each other, the magnitude of the first direct current voltage actually output by each battery pack 100 is different, and when the battery packs 100 are in discharging operation, it is difficult to avoid that the battery pack 100 with larger discharging reversely charges the battery pack 100 with smaller discharging, on one hand, the occurrence of the reverse charging condition reduces the power supply efficiency of the charging and discharging system 10 for electric equipment; on the other hand, the reverse charge may cause the battery pack 100 to overheat, even to self-ignite, causing a safety accident.

Therefore, in order to avoid the occurrence of the accident, in combination with the content of the present technical solution, the first voltage adjusting module 301a adjusts the first dc voltage output by the battery pack 100 to the first preset dc voltage, and since each branch circuit 1 is provided with the first voltage adjusting module 301a, the voltages of the respective branch circuits 1 participating in the discharging process at the terminals thereof are the same, that is, the voltages of each first voltage adjusting module 301a delivered to the ac and dc conversion modules 302a are all kept the same, so that the situation that the dc voltages of the plurality of battery packs 100 input by the input terminals of the branch circuits 1 electrically connected thereto meet at the terminals in the above discussion is avoided. In addition, it can be understood that the service life of the battery pack 100 is inversely related to the number of charging and discharging times in the normal use process of the battery pack 100, that is, the more the number of charging and discharging times is, the shorter the service life of the battery pack 100 will be, so that the effect of prolonging the service life of the battery pack 100 can be achieved by the technical scheme.

It should be noted that, the first voltage adjustment module 301a has a bidirectional dc voltage adjustment function, that is, when the charge-discharge system 10 is electrically connected to the battery pack 100 and is in a discharging state, the battery pack 100 can input the first dc voltage to the first voltage adjustment module 301a, whereas when the charge-discharge system 10 is electrically connected to the battery pack 100 and is in a charging state, the battery pack 100 can receive the dc voltage input from the first voltage adjustment module 301 a.

Similarly, the ac-dc conversion module 302a also has a bidirectional dc-ac conversion function, i.e., is capable of converting ac voltage into dc voltage and converting dc voltage into ac voltage. That is, when the charging and discharging system 10 is electrically connected with the battery pack 100 and is in a charging state, the alternating current provided by the power supply device can be converted into direct current and input into the first voltage regulating module 301a, and then the first voltage regulating module 301a regulates the direct current and inputs the direct current into the battery pack 100 adapted to the first voltage regulating module; on the contrary, when the charge-discharge system 10 is electrically connected to the battery pack 100 and is in a discharge state, the first voltage adjusting module 301a inputs a first preset dc voltage into the ac-dc converting module 302a, and the ac-dc converting module 302a converts the first preset dc voltage into a first ac voltage and inputs the first ac voltage into the ac electric device.

Preferably, the charge and discharge system 10 includes at least one current adjusting unit 200, for example, and the current adjusting unit 200 is disposed on the branch circuit 1, and the current adjusting unit 200 is used for adjusting the current input to the battery pack 100 electrically connected to the branch circuit 1.

In a specific example, for example, when the charge-discharge system 10 is in a charged state, the current flowing through the branch circuit 1 can be adjusted by the current adjusting unit 200 to be matched with the corresponding battery pack 100, so as to realize charging each battery pack 100 in a state of maintaining the maximum charging power, and further, the external multiple battery packs 100 can be quickly filled in a shorter time, so that the charging efficiency is improved; in addition, because the capability of the maximum current that each battery pack 100 can bear is different, the situation that the battery packs 100 are burnt out and even the charging and discharging system 10 is damaged due to the fact that the charging current with the same magnitude charges different battery packs 100 is avoided.

Preferably, the charge and discharge system 10 includes an information acquisition module and a control module. The information acquisition module is electrically connected to the branch circuit 1, and is used for acquiring the working state signal of the corresponding battery pack 100; the control module is electrically connected with the information acquisition module, and controls the current adjusting unit 200 to deliver safety current to the corresponding battery pack 100 according to the working state information; wherein the safety current is equal to or less than the maximum charging current of the battery pack 100. The control module may be, for example, an MCU control chip.

In one embodiment, it is understood that each battery pack 100 is provided with a unique identification inside before shipment, so that the control module can implement a communication connection with the battery pack 100 according to the identification. In combination with the actual communication connection situation, when the plurality of battery packs 100 are in communication connection with the first voltage adjusting module 301a and the ac-dc converting module 302a through the plurality of branch circuits 1, each battery pack 100 will send an "information code" for identity recognition to the control module, and at this time, the information acquiring module recognizes the "information code" to determine whether the preset condition is satisfied, that is, whether the "information code" can be accurately recognized by the information acquiring module, if so, a corresponding "model code" is generated inside the information acquiring module, and the "model code" is returned to the battery pack 100. At this time, the battery pack 100 judges that the "model code" is true, and then the information acquisition module implements information intercommunication with the battery pack 100, so that the information acquisition module can acquire corresponding working state information of the battery pack 100, so that when the charging and discharging system 10 is in a charging state, the external power supply equipment inputs current into the corresponding branch circuit 1, and the control module controls the current adjusting unit 200 to adjust the current of the branch circuit 1 for charging the battery pack 100 according to different working state information, so as to ensure that the total charging power reaches the maximum, improve the charging efficiency and ensure the safe and reliable charging process.

Further, the operation state information includes, for example, the temperature of the battery pack 100. In combination with the foregoing embodiments, in another embodiment, when the charge and discharge system 10 is in a discharge state, at this time, the charge and discharge system 10 controls the battery pack 100 to supply power to the electric device, and when the information acquisition module acquires that the temperature of the battery pack 100 exceeds the preset temperature, it is determined that the battery pack 100 is in an overload state at this time, that is, the required power of the electric device for normal operation is too large, so that the information acquisition module sends the working state information corresponding to the temperature of the battery pack 100 to the control module, and then disconnects the branch circuit 1 from the battery pack 100, or controls the output port of the ac/dc conversion module 302a for electrically connecting with the electric device to disconnect, so as to avoid damage of the battery pack 100 due to overload.

Preferably, the charge and discharge system 10 includes, for example, a first output circuit 310, a first input circuit 320, a signal recognition unit, and a regulating circuit 500. One end of the first output circuit 310 is electrically connected with the output port of the alternating current-direct current conversion module 302a, and the other end of the first output circuit is provided with a first output port 305 electrically connected with electric equipment; one end of the first input circuit 320 is electrically connected with the input port of the alternating current-direct current conversion module 302a, and the other end is provided with a first input port 306 electrically connected with power supply equipment; the signal identifying unit is electrically connected to the first input circuit 320, and when identifying that the first input port 306 is electrically connected to the power supply device, the signal identifying unit sends a first signal to the ac-dc conversion module 302 a; the regulating circuit 500 is electrically connected to the first output circuit 310 and the first input circuit 320, and when the power supply device is electrically connected to the first input port 306, the regulating circuit 500 splits a current input by the power supply device into a first current input to the first output circuit 310 and a second current output by the first output port 305; when the control module obtains the first signal, it controls to disconnect the second output circuit 340 that the first voltage adjusting module 301a outputs to the ac-dc converting module 302 a.

Preferably, the first input port 306 comprises, for example, a first dc input port and/or a first ac input port. The first dc input port 306 is used for inputting dc into the first input circuit 320; the first ac input port is for inputting ac power into the first input circuit 320.

In one embodiment, the first output port 305 and the first input port 306 are both ac ports, the first output port 305 is taken to be an ac output port 30A, and the first input port 306 is taken to be an ac input port 30B. Then, the battery pack 100 electrically connected by the branch circuit 1 outputs a first dc voltage to the first voltage adjusting module 301a, the first voltage adjusting module 301a receives the first dc voltage and converts it into a first preset dc voltage with a uniform magnitude, the ac-dc converting module 302a receives the first preset dc voltage and converts it into a first ac voltage, and finally the first ac voltage is output from the ac output port 30A to the electric device.

For example, when an ac power supply device is connected to the ac input port 30B and a powered device is connected to the ac output port 30A, the charging and discharging system 10 is in a discharging and charging state at the same time. Specifically, in the prior art, in the process of supplying power to the battery pack 100 through the charging and discharging system 10, the external power supply device is electrically connected to the electric device at the ac output port 30A, so that the battery pack 100 discharges simultaneously for supplying power to the electric device. However, there is a problem in that the service life of the battery pack 100 is inversely related to the number of times of charge and discharge, that is, the greater the total number of times of charge and discharge, the shorter the service life of the battery pack 100. Furthermore, on the premise of ensuring that power supply to the electric equipment is not affected, in order to prolong the service life of the battery pack 100, that is, reduce the total number of times of charging and discharging the battery pack 100, the content of the technical scheme needs to be combined.

Specifically, the first input port 306 receives ac power from the ac power supply device, and under the action of the adjusting circuit 500, the ac power inputted to the first input port 306 is split into a first current and a second current, where the first current does not enter the ac-dc conversion module 302a but directly enters the first output circuit 310 through the adjusting circuit 500, so that the first current is directly outputted to the electric device and is used for supplying power to the electric device; and the second current is used to power the battery pack 100.

With reference to fig. 5, further, the second current flows through the ac-dc conversion module 302a, and is converted into dc, and the dc is input to the first voltage adjustment module 301a through the second input circuit 350, and finally the dc voltage is stepped up and down by the first voltage adjustment module 301a, so that the dc voltage is input to the corresponding battery pack 100 through the corresponding branch circuit 1, where the voltage is adjusted to adapt to the maximum charging current of the corresponding battery pack 100 through the first voltage adjustment module 301a, so as to improve the overall charging efficiency, and thus reduce the charging time.

Of course, in another specific example, the first input port 306 may be, for example, a first dc input port, and the first dc input port may input dc into the first input circuit 320. Typically, the power supply device is an ac power supply device, for example, the ac power supply device is a mains supply, and thus, in order to facilitate inputting ac power into the charging and discharging system, a conversion wire may be externally connected to the first input port 306, and the conversion wire may be used to convert ac power into dc power. Specifically, a rectifier bridge circuit is disposed in the conversion wire, and the rectifier bridge circuit can convert alternating current into direct current, so that one end of the conversion wire is electrically connected with the first direct current input port, and the other end of the conversion wire is electrically connected with the alternating current power supply device, thereby converting alternating current output by the alternating current power supply device into direct current, and inputting the direct current into the first input circuit 320 through the first direct current input port.

Specifically, as in the above-described specific example, when an alternating current power supply device is electrically connected to the first direct current input port and an electric device is electrically connected to the first output port, at this time, the charge and discharge system is in both the charge and discharge states. The electric device is, for example, an ac electric device, and the conversion wire is electrically connected to the ac power supply device and the first dc input port, so that the ac power of the ac power supply device is converted into dc, and then the dc is converted into a third current, and then the third current is converted into ac by the dc of the ac-dc conversion module 302a, so that the ac converted by the third current enters the first output circuit 310, and is output to the ac electric device by the first output circuit 310 through the first output port 305, so as to supply power to the ac electric device. And thus also reduces the number of times of discharging the battery pack 100 in this case to some extent to extend the service life thereof.

More specifically, the conditioning circuit 500 may be used to turn off or on the second output circuit 340. Specifically, on the basis of the above specific content, in order to reduce the number of discharging times of the battery pack 100 to improve the service life thereof, the adjusting circuit 500 controls the second output circuit 340 to be disconnected while the ac power converted by the third current is supplied to the ac power supply device, so that the circuit for outputting the current from the battery pack 100 to the direction of the first voltage adjusting module 301a is disconnected, thereby effectively avoiding the discharging of the battery pack 100 in this case, and thus, the process of supplying the ac power to the ac power supply device by the charging and discharging system 10 is not aided by the discharging of the battery pack 100.

Further, since the first input port 306 is externally connected with the power supply device, the signal identifying unit obtains the first signal at the first input port 306 and sends the first signal to the control module, so that the control module disconnects the second output circuit 340 that the first voltage adjusting module 301a outputs to the ac and dc converting module 302a, at this time, the battery pack 100 cannot supply power to the electric device, and instead, the first current is made to supply power to the electric device under the action of the adjusting circuit 500, so that the discharging frequency of the battery pack 100 is reduced, and the service life of the battery pack 100 is prolonged.

When the first input port 306 is not externally connected with the power supply device, the signal recognition unit sends a second signal to the control module, and the control module controls the second output circuit 340 to resume conducting according to the second signal, so as to smoothly complete the discharging effect of the battery pack 100 on the electric device.

Thus, in combination with the above description, it is realized that the charging and discharging system 10 can continuously provide power for the electric equipment no matter whether the first input port 306 is connected to the electric equipment, so as to improve the use efficiency of the charging and discharging system 10, and realize the fine control of discharging the battery pack 100, and avoid frequent discharging of the battery pack 100, thereby improving the service life of the battery pack 100 and reducing the use cost expenditure of the whole equipment to a certain extent.

Preferably, the charge and discharge system 10 includes, for example, a second dc bypass 330. And one end of the second dc bypass 330 is electrically connected to the second output circuit 340 of the first voltage adjusting module 301a outputting dc to the ac-dc converting module 302a, and the other end is electrically connected to the second dc output port 40; the second dc output port 40 is used for electrically connecting with dc electric equipment. By providing the second dc bypass 330, the usability of the charging and discharging system 10 can be improved, that is, the battery pack 100 can supply power to not only ac electric equipment but also dc electric equipment through the charging and discharging system 10. For example, the second dc output port 40 may be one or more of a USB interface, a type-c interface, and a cigar lighter.

Referring to fig. 2-3, in another embodiment, one end of the second dc bypass 330 is electrically connected to the second input circuit 350 of the ac-dc conversion module 302a outputting dc to the first voltage adjustment module 301a, and the other end is electrically connected to the second dc output port 40. In combination with the above specific example, when the electric device is electrically connected to the first output port 305 and the power supply device is electrically connected to the first input port 306, the first input port 306 receives the current from the power supply device, and the current input from the first input port 306 is split into the first current, the second current and the third current under the action of the adjusting circuit 500, where the first current does not enter the ac-dc conversion module 302a but directly enters the first output circuit 310 through the adjusting circuit 500, and is further directly output to the electric device and supplies power to the electric device; and the second current is used to power the battery pack 100.

Specifically, the second current enters the ac-dc conversion module 302a from the first input circuit 320 and is converted into a dc voltage, and then the dc voltage is distributed to the corresponding battery pack 100 by the first voltage adjustment module 301a, more specifically, the second current enters the second input circuit 350 after exiting from the ac-dc conversion module 302a, a part of the second current enters the first voltage adjustment module 301a for charging the battery pack 100, and another part of the second current enters the second dc bypass 330, and is adjusted by the voltage of the voltage transformation circuit 400, and finally is output from the second dc output port 40 to the dc consumer. In this process, according to the different charging rated currents of the battery packs 100, the control module controls the current adjusting unit 200 to adjust so that the charging power of each battery pack 100 meets the rated charging power requirement, thereby improving the charging efficiency and reducing the charging time.

Thus, in the above specific example, the charging and discharging system 10 realizes the power supply to the ac electric device and the power supply to the dc electric device at the same time, which improves the usability thereof, and in addition, has the effect of reducing the discharging of the battery pack 100 in the charging process, and improves the service life of the battery pack 100.

Preferably, the second dc bypass 330 includes, for example, a voltage transformation circuit 400, where the voltage transformation circuit 400 is configured to step up or step down the dc voltage output to the powered device by the first voltage module. Specifically, the second dc bypass 330 is provided with the voltage transformation circuit 400, so that the first dc voltage can be adjusted to be suitable for the rated voltage of the dc electric device, and the voltage transformation circuit 400 is commonly used for reducing the voltage of the first dc voltage so as to supply power to the small dc electric device, which can be, for example, a small lighting lamp.

Preferably, the charge-discharge system 10 comprises, for example, a third dc bypass, one end of which is electrically connected to the corresponding branch circuit 1, and the other end of which is electrically connected to the second dc input port 50; wherein the second dc input port 50 is configured to be electrically connected to a dc power supply device.

Referring to fig. 4, in a specific implementation, the dc power supply device may be a solar cell 600, and in combination with a specific usage scenario, especially when the weather is clear outdoors, it is inconvenient to connect the commercial power into the charging and discharging system 10 to supply power to the battery panel, so at this time, the solar cell 600 may be electrically connected with the second dc input port 50, so that the solar cell 600 converts solar energy into electric energy, and then the electric energy directly charges the plurality of battery panels through the plurality of branch circuits 1, thereby greatly improving the usage versatility of the charging and discharging system 10, reducing the dependence on the usage scenario, and similarly, using the solar cell 600 to replace the commercial power to charge, reducing the electricity cost to a certain extent, and also realizing the utilization of low-carbon new energy, and being beneficial to environmental protection.

Further, the solar cell 600 may be connected to the second DC input port 50 through the MPPT controller, and input a DC charging current of Vs to the corresponding branch circuit 1, and the control module manages the charging efficiency of the battery pack 100 according to the identified current voltage or rated charging current of the external battery pack 100 by controlling the current adjusting unit 200.

Of course, considering the electric energy converted from solar energy by the solar cell 600, it has a smaller voltage and forms a smaller current, thus satisfying the safety requirements of the battery pack 100 for the maximum charging voltage and current.

In still another embodiment, in order to ensure a safe connection between the charging and discharging system 10 and the battery pack 100, the direct current input by the second direct current input port 50 may be made to correspond to each bidirectional DC/DC, and the stable direct current of the direct current voltage Vs input by the second direct current input port 50 is converted into a charging current suitable for charging the corresponding battery pack 100 by each bidirectional DC/DC to charge the battery pack 100, and similarly, the input of a DC wide voltage may be implemented, and when the DC input power is greater than or equal to the total maximum charging power of the plurality of battery packs 100, the corresponding externally connected battery pack 100 may be charged with the maximum charging power by each bidirectional DC/DC, which also satisfies that the battery pack 100 is charged with 1C or higher than 0.5C rate.

Preferably, when the charge-discharge system 10 is in a charged state, for example, the dc current output from the ac-dc conversion module 302a to the first voltage adjustment module 301a satisfies that the battery pack 100 is charged at a rate of 0.5C or more; or alternatively. The total discharging power of the ac-dc conversion module for discharging the battery pack 100 is greater than the total charging power of charging the battery pack 100, and the total charging power is greater than or equal to the rated charging power of at least one battery pack 100. So that the discharge efficiency of the charge-discharge system 10 is higher than the charge efficiency.

Likewise, by adapting the first voltage adjustment module 301a and the AC-DC conversion module 302a, on the one hand, the AC output of the charge-discharge system 10 can be ensured, and for ease of understanding, the first voltage adjustment module 301a can be defined as bidirectional DC/DC, the AC-DC conversion module 302a can be defined as bidirectional AC/DC, and the AC can be defined as AC, and the DC can be defined as DC. On the other hand, the input of the total charging power can be effectively satisfied, so that each external battery pack 100 can be charged with the maximum charging power, and compared with the traditional method of charging with an external power adapter, the method has low charging cost, and is specifically and equally illustrated as follows:

Assume that the battery pack 100 has the following specifications:

voltage 20V, capacity 5Ah, maximum sustained discharge current 20A, maximum charge current 8A;

the portable charge and discharge system 10 includes 4 of the above-described battery packs 100 connected in parallel with each other; then the first time period of the first time period,

the forward inverted output power P1 of the bidirectional AC/DC unit 302a supports 4×20v×20a=1600W;

battery pack 100 sets of maximum charging power 4×20v×8a=640W; the fastest charge time of the cell pack 100 is 5/8h (37.5 min);

in this way, the forward inverting output power P1 of the bidirectional AC/DC of the charging and discharging system 10 can reach 1600W, and the reverse charging power P2 can reach 1600w×80% =1280w >640W according to theoretical calculation (considering power loss), so that the reverse charging power P2 is greater than the maximum charging power, and the input of the total charging power can be satisfied, so as to ensure that each external battery pack 100 can be charged with the maximum charging power.

Similarly, in terms of cost, if an external power adapter with a maximum charging power of 640W needs to be configured to realize high-power rapid charging, an independent AC-DC rectification module needs to be configured, and the charging and discharging system 10 needs to support 1600W of inversion output, and a DC-DC unit and a DC-AC inversion unit need to be additionally configured, so that the overall scheme cost is higher;

In contrast, after the bidirectional AC/DC and the bidirectional DC/DC are adopted, part of components adopted in the charging and inverting output process are shared by the application of the bidirectional AC/DC and the bidirectional DC/DC, so that the overall cost can be effectively reduced, and the high-power charging can be satisfied.

Embodiment two:

the embodiment provides an energy storage device. The energy storage device includes, for example, the charge-discharge control charge-discharge system 10, the mounting case, and the at least one battery pack 100 as described in the first embodiment. A mounting space for mounting the charge-discharge control charge-discharge system 10 is arranged in the mounting shell; at least one battery pack 100 is detachably provided to the mounting portion of the mounting case; the mounting portion is provided with terminals for electrically connecting the battery pack 100 to the charge/discharge control charge/discharge system 10.

Specifically, the technical effects corresponding to any one of the technical solutions in the above embodiment can be achieved in this embodiment, and will not be described herein again.

In a specific example, the mounting portion is provided with a corresponding terminal adapted to be connected to a terminal of the battery pack 100, and for example, the corresponding terminal may include a positive terminal bat+, a negative terminal BAT-, a signal terminal D, and the corresponding terminal on the mounting portion also includes a positive terminal bat+, a negative terminal BAT-, a signal terminal D, and the corresponding battery pack 100 terminal includes a positive terminal bat+, a negative terminal BAT-, a signal terminal D, and a temperature terminal T. Wherein each terminal in the mounting portion is adapted to be connected with each terminal on the battery pack 100, thereby achieving electrical connection and communication connection of the battery pack 100 with the charge-discharge control charge-discharge system 10.

Further, the battery pack 100 is detachably connected to the mounting portion, and specifically, the battery pack 100 may be mechanically and electrically connected to the mounting portion and located outside the mounting housing, so that an operator can directly detach the battery pack. In order to enable the battery pack 100 to be stably mounted on the mounting portion, the mechanical connection manner may be, for example, a snap connection manner, and a clamping groove formed on the mounting portion and clamping the housing of the battery pack 100 is used for completing the stable mounting of the battery pack 100. Then, after the battery pack 100 is charged by the charging and discharging system, the battery pack 100 is pulled out from the mounting housing, and then the battery pack 100 is mounted on the electric tool, which may be a cordless dc tool, for example.

Embodiment III:

the present embodiment provides a power tool assembly. Specifically, the electric power tool assembly includes, for example, the charge and discharge system 10 in the first embodiment described above; or comprises the energy storage device according to the second embodiment.

When the electric tool assembly includes, for example, the charge and discharge system 10 in the above embodiment, the technical effects corresponding to any technical scheme in the first embodiment can be achieved, and will not be described herein again; similarly, when the electric tool assembly includes the energy storage device in the second embodiment, for example, the technical effects corresponding to any technical scheme in the second embodiment can be achieved, and will not be described herein again.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A long-life charge-discharge system, comprising:

a plurality of branch circuits, each of which is arranged in parallel between the branch circuits and is used for electrically and communicatively connecting a plurality of battery packs;

at least one first voltage regulation module, which is electrically connected with the branch circuit correspondingly; the first voltage regulating module is used for regulating the voltage input by the battery pack into a first preset direct-current voltage;

the alternating current and direct current conversion module is electrically connected with the at least one first voltage regulation module;

when the charging and discharging system is in a discharging state, the first voltage regulating module inputs the first preset direct current voltage into the alternating current and direct current conversion module, and the alternating current and direct current conversion module outputs alternating current voltage to electric equipment.

2. The charge and discharge system according to claim 1, characterized by comprising:

and the current regulating unit is arranged on the branch circuit and is used for regulating the current input into the battery pack electrically connected with the branch circuit.

3. The charge and discharge system according to claim 2, characterized by comprising:

the information acquisition module is electrically connected with the branch circuit and is used for acquiring a corresponding working state signal of the battery pack;

the control module is electrically connected with the information acquisition module and controls the current regulating unit to convey safety current to the corresponding battery pack according to the working state information;

and the safety current is smaller than or equal to the maximum charging current of the battery pack.

4. The charge and discharge system according to claim 1, characterized by comprising:

one end of the first output circuit is electrically connected with the output port of the alternating current and direct current conversion module, and the other end of the first output circuit is provided with a first output port electrically connected with the electric equipment;

one end of the first input circuit is electrically connected with the input port of the alternating current and direct current conversion module, and the other end of the first input circuit is provided with a first input port electrically connected with power supply equipment;

the signal identification unit is electrically connected to the first input circuit, and when the first input port is identified to be electrically connected with the power supply equipment, the signal identification unit sends a first signal to the alternating current and direct current conversion module;

The regulating circuit is electrically connected with the first output circuit and the first input circuit, and when the power supply equipment is electrically connected with the first input port, the regulating circuit divides the current input by the power supply equipment into a first current input into the first output circuit and a second current output by the first output port;

when the control module acquires the first signal, the control module controls to disconnect the second output circuit which is output by the first voltage regulating module to the direction of the alternating current and direct current conversion module.

5. The charge and discharge system of claim 4, wherein the first input port comprises:

a first direct current input port for inputting direct current into the first input circuit;

and/or a first alternating current input port for inputting alternating current into the first input circuit.

6. The charge and discharge system according to any one of claims 1 to 5, comprising:

one end of the second direct current bypass is electrically connected to a second output circuit for outputting direct current to the alternating current and direct current conversion module by the first voltage regulation module, and the other end of the second direct current bypass is electrically connected with a second direct current output port;

the second direct current output port is used for being electrically connected with direct current electric equipment.

7. The charge and discharge system of claim 6, wherein the second dc bypass comprises:

and the voltage transformation circuit is used for increasing or decreasing the direct-current voltage output to the electric equipment by the first voltage module.

8. The charge and discharge system according to claim 1, characterized by comprising:

a third DC bypass, one end of which is electrically connected with the corresponding branch circuit, and the other end of which is electrically connected with the second DC input port;

the second direct current input port is used for being electrically connected with direct current power supply equipment.

9. The charge and discharge system according to claim 1, wherein,

when the charging and discharging system is in a charging state, the alternating current and direct current conversion module outputs direct current to the first voltage regulation module to meet the requirement that the battery pack is charged at a rate of 0.50.5C or more;

and/or the total discharging power of the alternating current and direct current conversion module for discharging the battery pack is larger than the total charging power for charging the battery pack.

10. An energy storage device, comprising:

the charge-discharge system according to any one of claims 1 to 9;

the installation shell is internally provided with an installation space for installing the charging and discharging system;

At least one battery pack detachably arranged on the mounting part of the mounting shell;

wherein the mounting portion is provided with a terminal for electrically connecting the battery pack with the charge and discharge system.