CN106300514A - Electric automobile fast charging and discharging system, method and electric automobile - Google Patents

Abstract

The invention provides a kind of electric automobile fast charging and discharging system, including multiple set of cells；Multiple charging assemblies, each charging assembly all includes the first relay and cradle, cradle connect first relay formed charging controlling brancher, one end of charging controlling brancher connects the positive pole of corresponding set of cells, the other end of charging controlling brancher connects the negative pole of set of cells, and the negative pole of set of cells is connected to negative busbar；Multiple discharge assemblies, each discharge assembly all includes diode, and the anode of diode connects the positive pole of set of cells, and the negative electrode of diode is connected to positive bus-bar；And electric power controller.Present invention also offers a kind of electric automobile and a kind of electric automobile method for quickly charging and discharging.Electric automobile fast charging and discharging system, method and the electric automobile of the present invention, it is possible to achieve the big electric current quick charge of electrokinetic cell；Thoroughly solve the discharge and recharge circulation problem between set of cells in system charge and discharge process, it is ensured that security of system is run reliably.

Description

Electric vehicle fast charging and discharging system, method and electric vehicle

technical field

The invention relates to the technical field of electric vehicles, in particular to a fast charging and discharging system and method for electric vehicles and the electric vehicle.

Background technique

Generally, electric vehicles use single-system slow-charging lithium-ion power batteries, and the charging time is relatively long. Another important reason affecting the popularity of electric vehicles is the cruising range of electric vehicles. If the cruising range of pure electric vehicles is to be improved, the capacity of the corresponding power battery also needs to be increased. In the case of increasing the battery capacity of pure electric vehicles, the charging current needs to be as high as thousands of amperes to achieve ten-minute fast charging. In the current lithium battery industry, lithium titanate batteries can reach a high rate of 10C for safe charging and discharging, and the battery performance can fully meet the requirements of high-current fast charging. The size usually cannot be made too large, so the ordinary single-gun charging and discharging system cannot meet the needs of fast charging.

Contents of the invention

In view of the problem that the above-mentioned single gun charging and discharging system cannot realize fast charging, the purpose of the present invention is to provide a fast charging and discharging system and method for electric vehicles and an electric vehicle, which can realize high-current fast charging of electric vehicles and save charging time.

To achieve the above object, the present invention adopts the following technical solutions:

A fast charging and discharging system for electric vehicles, comprising:

multiple battery packs;

A plurality of charging assemblies corresponding to the plurality of battery packs, each of the charging assemblies includes a first relay and a charging stand, and the charging stand is connected in series with the first relay to form a charging control branch. One end of the charging control branch is connected to the positive pole of the corresponding battery pack, the other end of the charging control branch is connected to the negative pole of the battery pack, and the negative pole of the battery pack is connected to the negative bus bar;

A plurality of discharge components corresponding to a plurality of the battery packs, each of the discharge components includes a diode, the anode of the diode is connected to the positive pole of the battery pack, and the cathode of the diode is connected to the positive pole of the battery pack. a bus bar; and a power management device for controlling on or off of the charging component and the discharging component.

In one of the embodiments, for each of the charging components, the number of the charging base is multiple, and the multiple charging bases are connected in parallel to form a charging branch, and the charging branch is connected in series with the first relay The charging control branch is formed.

In one embodiment, each of the discharge assemblies further includes a second relay, one end of the second relay is connected to the positive electrode of the corresponding battery pack, and the other end of the second relay is connected to the positive bus.

In one of the embodiments, it also includes a plurality of current detection devices for real-time detection of the discharge current of the battery pack, and a plurality of the current detection devices are set in one-to-one correspondence with the battery pack; the current detection devices are connected in series It is arranged on the positive pole of the corresponding battery pack, and the current detection device is connected to the power management device.

In one of the embodiments, there are two battery packs, two charging assemblies and two discharging assemblies, and two charging seats in each charging assembly.

In one embodiment, each of the charging components further includes a first circuit breaker, and the charging control branch is connected in series with the first circuit breaker to the positive pole of the corresponding battery pack.

The present invention also provides an electric vehicle, including the electric vehicle fast charging and discharging system described in any one of the above.

In addition, the present invention also provides a fast charging and discharging method for an electric vehicle, comprising the following steps:

Controlling the first relays in the multiple charging components to be closed, so as to simultaneously charge multiple battery packs through the plug-in cooperation between multiple charging guns and multiple charging bases;

Determine whether the power of each battery pack reaches the preset power, if so, control the first relay corresponding to the battery pack to be disconnected, and the battery pack is turned on and discharged through its corresponding diode; if not, then control the corresponding first relay of the battery pack to discharge; A relay is in a closed state.

In one embodiment, the method further includes the steps of:

Obtaining the discharge current of each of the battery packs in real time;

Determine whether the discharge current of each of the battery packs is greater than or equal to the preset current, if so, control the second relay corresponding to the battery pack to close; if not, control the second relay corresponding to the battery pack to be off state.

In one embodiment, the method further includes the steps of:

Obtaining the tube temperature of the diode corresponding to each of the battery packs in real time;

Determine whether the tube temperature of each diode is greater than or equal to a preset temperature, if yes, control the second relay corresponding to the battery pack to close; if not, control the second relay corresponding to the battery pack to be in an open state.

The beneficial effects of the present invention are:

The fast charging and discharging system and method of the electric vehicle and the electric vehicle of the present invention can realize independent charging and discharging of each battery group through the one-to-one arrangement of multiple charging components and multiple battery packs, and can simultaneously charge and discharge the battery packs through multiple charging guns. The power battery of the whole vehicle is charged, so that the power battery can be charged quickly with a large current; and by setting the diode, the problem of charging and discharging circulation between the battery packs during the charging and discharging process of the system can be completely solved to ensure the safe and reliable operation of the system.

Description of drawings

Fig. 1 is the circuit principle diagram of the fast charge and discharge system of the electric vehicle of an embodiment of the present invention;

FIG. 2 is a flowchart of a fast charging and discharging method for an electric vehicle according to an embodiment of the present invention.

detailed description

In order to make the technical solution of the present invention more clear, the electric vehicle fast charging and discharging system, method and electric vehicle of the present invention will be further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and not to limit the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

As shown in FIG. 1 , the fast charging and discharging system for electric vehicles according to an embodiment of the present invention includes a plurality of battery packs 100, a charging assembly 200 and a discharging assembly 300 arranged in one-to-one correspondence with the plurality of battery packs 100, and is used to control the charging assembly. 200 and discharge assembly 300 turn on or off a power management device (not shown). Wherein, each battery pack 100 is formed by connecting multiple battery cells in series, so that each battery pack 100 can meet the voltage and power output requirements of the device. In this embodiment, the plurality of battery packs 100 use battery packs of the same specification, and in other embodiments, the multiple battery packs 100 can also use battery packs of different specifications. At the same time, by setting the charging assembly 200 and the discharging assembly 300 corresponding to each battery pack 100 one by one, the independent charging and discharging process of each battery pack 100 can be realized, so as to realize the charge and discharge control of each battery pack 100 .

Wherein, each charging assembly 200 includes a first relay and a charging base 210 , wherein the charging base 210 is used for plugging and matching with a charging gun. The charging stand 210 is connected in series with the first relay to form a charging control branch, one end of the charging control branch is connected to the positive pole of the corresponding battery pack 100, the other end of the charging control branch is connected to the negative pole of the battery pack 100, and the negative pole of the battery pack 100 is connected to the negative bus bar HV-. Specifically, the coil of the first relay can be connected to the power management device, and the contact K2 of the first relay can be connected in series with the charging stand 210 to form a charging control branch. At this time, when the power management device controls the first relay to be powered on, the contact K2 of the first relay is closed, so that a closed loop is formed between the charging assembly 200 and the battery pack 100. At this time, through the charging gun and the charging stand 210 The charging process of the battery pack 100 can be realized by plugging and mating. When the power management device controls the first relay to be powered off, the contact K2 of the first relay is disconnected, so that the charging assembly 200 is disconnected from the battery pack 100 .

In this embodiment, through the one-to-one correspondence between the charging assembly 200 and the battery pack 100, multiple charging guns (the rated current of a single charging gun is 250 amps) can be used to charge the power battery of the whole vehicle at the same time, so that the electric The charging current of the car can reach up to n×250 amperes (n is the number of battery packs, n≥2, and n is an integer), so that high-current fast charging of the power battery can be realized.

Each discharge assembly 300 includes a diode D1, the anode of the diode D1 is connected to the positive pole of the battery pack 100, and the cathode of the diode D1 is connected to the positive bus HV+. In this embodiment, the diode D1 can be a power diode with a reverse cut-off voltage as high as 1000V, and the current flowing through the diode D1 can reach thousands of amperes, which ensures the reliability and safety of the charging and discharging system. During the charging process of each battery pack 100, due to the forward conduction and reverse cut-off characteristics of the diode D1, no current can flow between the battery packs 100, but the diodes can be used to supply power to high-voltage auxiliary equipment/power systems, so as to achieve The purpose of charging each battery pack 100 independently completely solves the charging circulation problem among the battery packs 100 . Of course, during the charging process of each battery pack, due to the reverse cut-off characteristic of the diode, no charging circulation will be generated between each battery pack.

During the discharge process of each battery pack 100 , when the discharge voltage of each battery pack 100 is consistent, each battery pack 100 supplies power to high-voltage auxiliary equipment or power system through diode D1 at the same time, and no discharge circulation will be generated between each battery pack 100 . When the discharge voltages of the various battery packs 100 are inconsistent, according to the characteristics of the diode D1, the diode D1 corresponding to the battery pack 100 with a higher discharge voltage is first turned on, and automatically preferentially discharges. At this time, the diode D1 corresponding to the battery pack 100 with a lower discharge voltage The diode D1 is in a cut-off state, therefore, no circulating discharge current will be generated between the various battery packs 100 , so the problem of the circular discharge current among the various battery packs 100 is solved through the diode D1 .

In one embodiment, as shown in FIG. 1 , there are two battery packs 100 , and correspondingly, there are two charging assemblies 200 and two discharging assemblies 300 . In other embodiments, the number of battery packs 100 may be more than two.

For each charging assembly 200 , there are multiple charging bases 210 , the multiple charging bases 210 are connected in parallel to form a charging branch, and the charging branch is connected in series with the first relay to form a charging control branch. As shown in Figure 1, each charging assembly 200 includes two charging stands 210 arranged in parallel, the charging branch formed by the two charging stands 210 is connected in series with the first relay to form a charging control branch, and one end of the charging control branch is connected to the corresponding battery The positive pole of the group 100, the other end of the charging control branch is connected to the negative bus HV-. That is to say, in this embodiment, the two battery packs 100 are charged with double charging guns. During the charging process, four charging guns with a rated current of 250A can be used to charge the vehicle power battery at the same time, so that each battery The charging current of the group 100 can be as high as 500A, and the charging current of the system can be as high as 1000A, so as to realize the problem of high-current fast charging, which can effectively reduce the number of charging piles, save the area occupied by charging vehicles, and improve the use efficiency of electric vehicles . In other embodiments, more than two charging stands 210 may be arranged in parallel in each charging assembly 200 .

Further, each discharge assembly 300 also includes a second relay, one end of the second relay is connected to the positive pole of the corresponding battery pack 100, and the other end of the second relay is connected to the positive bus HV+, that is, the second relay is arranged in parallel with the diode D1. Specifically, the coil of the second relay can be connected to the power management device, and the contact K3 of the second relay can be arranged in parallel with the diode D1, that is, one end of the contact K3 of the second relay is connected to the positive pole of the corresponding battery pack 100, and the second relay The other end of the contact K3 is connected to the positive bus HV+.

When the power management device controls the second relay to be powered on, the contact K3 of the second relay is closed, so that a discharge circuit is formed among the discharge assembly 300, the battery pack 100 and the power system. Power supply for power system and high voltage auxiliary equipment. When the power management device controls the second relay to be powered off, the contact K3 of the second relay is disconnected, and at this time, the system supplies power to the power system and high-voltage auxiliary equipment through the diode D1. In this embodiment, the safety of the charging and discharging system can be further ensured by setting the second relay.

As a further improvement, it also includes a plurality of current detection devices 400 for real-time detection of the discharge current of the battery pack 100, and a plurality of current detection devices 400 are set in one-to-one correspondence with the battery pack 100; the current detection devices 400 are arranged in series on the corresponding The positive electrode of the battery pack 100 is connected to the power management device, and the current detection device 400 is used to transmit the detected discharge current corresponding to the battery pack 100 to the power management device. Wherein, the power management device may be a controller such as a single chip microcomputer, and the current detection device 400 may be a Hall transformer or the like.

The power management device respectively judges that the discharge current of each battery pack 100 is greater than or equal to the preset current according to the received discharge current of each battery pack 100, and if the discharge current of the battery pack 100 is greater than or equal to the preset current, it will cause the battery pack to The heating value of the diode D1 corresponding to 100 is too large. At this time, the power management device controls the second relay corresponding to the battery pack 100 to close, so that the diode D1 corresponding to the battery pack 100 is in a short-circuit state, so as to prevent the diode D1 from flowing due to a large current. Excessive heat generation ensures the safety of the charging and discharging system. If the discharge current of the battery pack 100 is less than the preset current, the power system and high-voltage auxiliary equipment can continue to be powered through the diode D1. At this time, the power management device controls the second relay not to act, that is, controls the second relay to remain in the disconnected state .

Furthermore, the power management device is also used to obtain the tube temperature of each diode D1 in real time, and judge whether the tube temperature of each diode D1 is greater than or equal to the preset temperature, if the tube temperature of the diode D1 is greater than or equal to the preset temperature, then The second relay connected in parallel with the diode D1 is controlled to close, so that the diode D1 corresponding to the battery pack 100 is in a short-circuit state, thereby ensuring the safety of the charging and discharging system. If the tube temperature of the diode D1 is lower than the preset temperature, the power system and high-voltage auxiliary equipment can continue to be powered through the diode D1. At this time, the power management device controls the second relay not to act, that is, controls the second relay to remain in the off state.

Alternatively, when the discharge current of the battery pack 100 is greater than or equal to the preset current and the tube temperature of the diode corresponding to the battery pack is greater than or equal to the preset temperature, step S600 is performed to control the second relay corresponding to the battery pack to close, so that the battery pack The corresponding diode D1 is in a short-circuit state, thereby ensuring the safety of the discharge system. Otherwise, return to step S300, that is, control the second relay corresponding to the battery pack to be in the off state, and continue to supply power to the power system and high-voltage auxiliary equipment through the diode D1.

In one embodiment, each charging assembly 200 further includes a first disconnecting device F3, and the charging control branch is connected to the positive electrode of the corresponding battery pack 100 after connecting the first disconnecting device F3 in series. The charging and discharging system also includes a second breaking device F2, which is arranged in series on the positive pole of the battery pack 100, one end of the first breaking device F3 is connected to the charge control branch, and the other end of the first breaking device F3 is connected to the second Breaking device F2. Wherein, the first breaking device F3 and the second breaking device F2 may be circuit breakers, trippers or contactors and the like.

The working process of the charging and discharging system of the present invention is illustrated below in conjunction with the accompanying drawings:

As shown in Figure 1, the charging and discharging system of this embodiment is used to supply power to the power system and high-voltage auxiliary equipment, etc., wherein the power system series disconnection device is connected between the positive bus HV+ and the negative bus HV-, and the high-voltage auxiliary equipment is connected in series. The device and the control switch are connected between the positive bus HV+ and the negative bus HV-.

The negative pole of the battery pack 100 is connected to the negative bus HV-, the positive pole of the battery pack 100 is connected in series with the second circuit breaker F2, the current detection device 400 and the contact K3 of the second relay, and then the positive bus HV+, and the anode of the diode D1 is connected to the current detection At one end of device 400, the cathode of diode D1 is connected to positive bus HV+. The two charging bases 210 are connected in parallel to form a charging branch, which is connected to the contact K3 of the second relay in series with the contact K2 of the first relay and the first breaking device F3 in sequence.

When each battery pack needs to be charged, the charging gun is plugged and matched with each charging stand, and then each first relay is controlled to be powered on, the contact K2 of the first relay is closed, and each second relay is controlled to be in a power-off state , the contact K3 of the second relay is disconnected, so that the charging control branch and the battery pack 100 form a closed loop to realize the charging process of the battery pack 100 . When the charging of each battery pack is completed, the first relay is controlled to be powered off, and the contact K2 of the first relay is opened.

When it is necessary to supply power to the power system and/or high-voltage auxiliary equipment, etc., first judge the discharge voltages of the two battery packs. Specifically, when the discharge voltages of the two battery packs 100 are the same, the diodes D1 corresponding to the two battery packs are both conducting When connected, the two battery packs supply power to the power system at the same time through the diode D1. When the discharge voltages of the two battery packs 100 are different, and the discharge voltage of the first battery pack on the left is greater than the discharge voltage of the second battery pack on the right, then according to the conduction principle of the diode, the diode corresponding to the first battery pack on the left D1 is preferentially turned on, and the first battery pack preferentially supplies power to the power system until the discharge voltages of the two battery packs are the same, and then supplies power to the power system at the same time.

Afterwards, the power management device respectively judges whether the discharge current of each battery pack 100 is greater than or equal to the preset current according to the discharge current of each battery pack 100 transmitted by the current detection device, and/or whether the tube temperature of the corresponding diode of the battery pack is greater than or equal to preset temperature. When the discharge current of the battery pack is greater than or equal to the preset current, and/or the tube temperature of the diode corresponding to the battery pack is greater than or equal to the preset temperature, the second relay corresponding to the battery pack is controlled to close. Otherwise, control the second relay corresponding to the battery pack to be in an off state.

The present invention also provides an electric vehicle, including the fast charging and discharging system for an electric vehicle according to any one of the above embodiments.

In addition, as shown in Figure 2, the present invention provides a fast charging and discharging method for an electric vehicle, comprising the following steps:

S100. Control the first relays in multiple charging components to be closed, so as to simultaneously charge multiple battery packs through the plug-in cooperation between multiple charging guns and multiple charging stands; when it is detected that the charging guns are inserted into the charging stand 210 , the first relays corresponding to each battery pack are controlled to be closed. At this time, the charging assembly 200 corresponding to each battery pack forms a closed circuit with the battery pack 100, and the battery pack 100 is charged through the charging gun. In this embodiment, by controlling multiple first relays to be closed at the same time, multiple charging guns are used to charge the power battery at the same time, so that the power battery can be charged quickly with a large current and save charging time.

Specifically, the two battery packs 100 are charged with double charging guns. During the charging process, four charging guns with a rated current of 250A can be used to charge the power battery of the vehicle at the same time, so that each battery pack 100 The charging current can be as high as 500A, and the charging current of the system can be as high as 1000A, so as to realize the problem of high-current fast charging, which can effectively reduce the number of charging piles, save the area occupied by charging vehicles, and improve the use efficiency of electric vehicles. In other embodiments, more than two charging stands 210 may be arranged in parallel in each charging assembly 200 .

At the same time, during the charging process of each battery pack, due to the reverse cut-off characteristic of the diode, no current can flow between each battery pack 100, so that the purpose of independent charging of each battery pack 100 can be achieved, and the problem between each battery pack 100 is completely solved. charging circulation problem.

Afterwards, it is judged whether the power of each battery pack 100 reaches a preset power, wherein the preset power may be that the power percentage is equal to 100%. If so, that is, when the power of the battery pack 100 reaches the preset power level, it means that the battery pack 100 has been charged. At this time, step S200 is performed to control the first relay corresponding to the battery pack 100 to be disconnected, and the battery pack conducts the battery through its corresponding diode. Through discharge, that is, the battery pack 100 supplies power to the power system and/or high-voltage auxiliary equipment through the diode D1. Otherwise, it means that the charging process of the battery pack 100 has not been completed, and the first relay corresponding to the control battery pack is still in the closed state until the electric quantity of the battery pack is equal to the preset electric quantity.

During the discharge process of each battery pack 100, when the discharge voltage of each battery pack 100 is the same, the diode D1 corresponding to each battery pack is turned on at the same time, and each battery pack 100 supplies power to high-voltage auxiliary equipment or power system through diode D1 at the same time, each No discharge circulation will be generated between the battery packs 100 . When the discharge voltages of the various battery packs 100 are inconsistent, according to the characteristics of the diodes, the diode D1 corresponding to the battery pack 100 with a higher discharge voltage is first turned on, and automatically preferentially discharges. At this time, the diode D1 corresponding to the battery pack 100 with a lower discharge voltage D1 is in a cut-off state, therefore, no circulating discharge current will be generated between the battery packs 100 , so the problem of circulating discharge current between the battery packs 100 is solved through the diode D1 .

In one embodiment, the above-mentioned method also includes the following steps:

S300. Obtain the discharge current of each battery pack 100 in real time; in this embodiment, the discharge current of each battery pack 100 can be detected in real time by the Hall transformer arranged at the positive pole of each battery pack 100;

S400. Determine whether the discharge current of each battery pack 100 is greater than or equal to the preset current. If so, it will cause the diode D1 corresponding to the battery pack 100 to generate too much heat. At this time, perform step S600 to control the battery pack 100. The second relay is closed, so that the diode D1 corresponding to the battery pack 100 is in a short-circuit state, so as to prevent the diode D1 from generating too much heat due to the large current flowing through it, and ensure the safety of the charging and discharging system. If not, that is, the discharge current of the battery pack 100 is less than the preset current, at this time, return to step S300, that is, control the second relay corresponding to the battery pack 100 to be in an off state, and continue to supply power to the power system and high-voltage auxiliary equipment through the diode D1 . Wherein, the preset current may be the reverse cut-off current of the diode D1.

In one embodiment, the above-mentioned method also includes the following steps:

S300. Obtain the tube temperature of the diode D1 corresponding to each battery pack in real time;

S500. Determine whether the tube temperature of each diode D1 is greater than or equal to the preset temperature. If yes, it means that the heat generation of the diode D1 corresponding to the battery pack 100 may be too large. At this time, step S600 is executed to control the corresponding The second relay is closed, so that the diode D1 corresponding to the battery pack 100 is in a short-circuit state, thereby ensuring the safety of the charging and discharging system. If not, return to step S300, that is, control the second relay corresponding to the battery pack to be in the off state, and continue to supply power to the power system and high-voltage auxiliary equipment through the diode D1.

Alternatively, when the discharge current of the battery pack 100 is greater than or equal to the preset current and the tube temperature of the diode corresponding to the battery pack is greater than or equal to the preset temperature, step S600 is performed to control the second relay corresponding to the battery pack to close, so that the battery pack The corresponding diode D1 is in a short-circuit state, thereby ensuring the safety of the discharge system. Otherwise, return to step S300, that is, control the second relay corresponding to the battery pack to be in the off state, and continue to supply power to the power system and high-voltage auxiliary equipment through the diode D1.

Wherein, the charging and discharging method of the electric vehicle described above is consistent with the working principle of the charging and discharging system described above, for details, please refer to the above description.

The fast charging and discharging system and method of the electric vehicle and the electric vehicle of the present invention can realize independent charging and discharging of each battery group through the one-to-one arrangement of multiple charging components and multiple battery packs, and can simultaneously charge and discharge the battery packs through multiple charging guns. The power battery of the whole vehicle is charged, so that the power battery can be charged quickly with a large current; and by setting the diode, the problem of charging and discharging circulation between the battery packs during the charging and discharging process of the system can be completely solved to ensure the safe and reliable operation of the system.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. an electric automobile fast charging and discharging system, it is characterised in that including:

Multiple set of cells；

The multiple charging assemblies arranged with multiple described set of cells one_to_one corresponding, each described charging assembly all includes the first relay Device and cradle, described first relay of described cradle series connection forms charging controlling brancher, the one of described charging controlling brancher End connects the positive pole of corresponding set of cells, and the other end of described charging controlling brancher connects the negative pole of described set of cells, described battery The negative pole of group is connected to negative busbar；

The multiple discharge assemblies arranged with multiple described set of cells one_to_one corresponding, each described discharge assembly all includes diode, The anode of described diode connects the positive pole of described set of cells, and the negative electrode of described diode is connected to described positive bus-bar；And

For the electric power controller controlling described charging assembly and described discharge assembly is turned on and off.

Electric automobile fast charging and discharging system the most according to claim 1, it is characterised in that for each described charging group Part, the quantity of described cradle is multiple, the charging paths that formed in parallel, the series connection of described charging paths between multiple described cradles Described first relay forms described charging controlling brancher.

Electric automobile fast charging and discharging system the most according to claim 1, it is characterised in that each described discharge assembly is also Including the second relay, one end of described second relay connects the positive pole of corresponding described set of cells, described second relay The other end is connected to positive bus-bar.

Electric automobile fast charging and discharging system the most according to claim 1, it is characterised in that also include for detection in real time Multiple current sensing means of the discharge current of described set of cells, multiple described current sensing means and described set of cells one a pair Should arrange；Described current sensing means is arranged in series in the positive pole of corresponding set of cells, and described current sensing means is connected to Described electric power controller.

5. according to the electric automobile fast charging and discharging system described in any one of claim 1-4, it is characterised in that described battery The quantity of group, described charging assembly and described discharge assembly is two, and cradle described in each described charging assembly Quantity is two.

Electric automobile fast charging and discharging system the most according to claim 5, it is characterised in that in each described charging assembly Also include the first tripper, after described charging controlling brancher described first tripper of series connection, connect corresponding described set of cells Positive pole.

7. an electric automobile, it is characterised in that include the electric automobile fast charging and discharging system described in any one of claim 1-6 System.

8. the method for quickly charging and discharging of an electric automobile, it is characterised in that comprise the steps:

The first relay controlled in multiple charging assembly all closes, and joins with the grafting by multiple charging guns with multiple cradles Close, multiple set of cells are charged simultaneously；

Judge whether the electricity of each set of cells reaches to preset electricity respectively, the most then control the first relay that set of cells is corresponding Device disconnects, and described set of cells is discharged by the diode current flow of its correspondence；If it is not, then control the first relay that set of cells is corresponding It is in closure state.

Method for quickly charging and discharging the most according to claim 8, it is characterised in that described method also comprises the steps:

Obtain the discharge current of each described set of cells in real time；

Judge that the discharge current of each described set of cells whether more than or equal to predetermined current, the most then controls described electricity respectively The second relay Guan Bi that pond group is corresponding；If it is not, the second relay then controlling described set of cells corresponding is off.

Method for quickly charging and discharging the most according to claim 8 or claim 9, it is characterised in that described method also includes walking as follows Rapid:

Obtain the Guan Wen of diode corresponding to each described set of cells in real time；

Judge that the Guan Wen of each diode whether more than or equal to preset temperature, the most then controls described set of cells corresponding respectively Second relay Guan Bi；If it is not, the second relay then controlling described set of cells corresponding is off.