Charging pile and its power distribution system and power distribution method

Abstract

The present invention discloses a charging pile, its power distribution system and power distribution method. The charging pile includes a plurality of charging guns and a single heat dissipation module, and the plurality of charging guns are all connected to the heat dissipation module and dissipate heat through heat exchange therewith. The power distribution system includes: a power module for providing power to the plurality of charging guns; a control unit connected to the power module and the heat dissipation module, for determining the output current of each charging gun according to the maximum heat dissipation power P loss Max of the heat dissipation module and the maximum heat loss P charger Max of each charging gun when the plurality of charging guns are charging simultaneously; and a power distribution unit connected to the power module and the control unit, for distributing the power provided by the power module to the device to be charged connected thereto through the corresponding charging gun according to the output current of each charging gun. The present invention can make the output efficiency and heat dissipation efficiency of the charging pile reach the highest.

Description

Technical Field

[0001] The present invention relates to a charging pile, and in particular to a charging pile and a power distribution system and a power distribution method thereof. Background Art

[0002] Currently available high-power charging piles are equipped with either a single charging gun (hereinafter referred to as "single gun") or two charging guns (hereinafter referred to as "dual guns"), but the heat dissipation of their charging guns is independent (i.e. one charging gun corresponds to one heat dissipation module).

[0003] In the current application environment, charging piles are in a "non-full power" charging demand state most of the time. Therefore, for a high-power single-gun system, the system utilization efficiency is not high. For a high-power dual-gun system, both guns use independent heat dissipation modules. First, the charging gun is bulky, and second, the utilization rate of the heat dissipation module of the charging gun is not high, resulting in low heat dissipation efficiency of the system.

[0004] Therefore, there is an urgent need to provide a charging pile that can effectively improve the output efficiency and heat dissipation efficiency of the system. Summary of the invention

[0005] The object of the present invention is to provide a charging pile and its power distribution system and power distribution method, which can effectively improve the output efficiency and heat dissipation efficiency of the system by allowing multiple charging guns to share a heat dissipation module and dynamically controlling the output current of each charging gun.

[0006] In order to achieve the above object, the present invention provides a power distribution system for a charging pile, which is characterized in that the charging pile includes a plurality of charging guns and a single heat dissipation module, the plurality of charging guns are connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the power distribution system includes:

[0007] A power module, used to provide power to the multiple charging guns;

[0008] A control unit is connected to the power module and the heat dissipation module. When the multiple charging guns are charged at the same time, the control unit controls the heat dissipation module according to the maximum heat dissipation power P of the heat dissipation module. loss Max and the maximum heat loss P of each charging gun charger Max, determines the output current of each charging gun, where the maximum heat dissipation power P of the heat dissipation module loss Max is greater than or equal to the maximum heat loss of any of the charging guns, and less than the sum of the maximum heat losses of each of the multiple charging guns;

[0009] A power distribution unit is connected to the power module and the control unit, and is used to distribute the power provided by the power module to the connected to-be-charged device through the corresponding charging gun according to the output current of each charging gun.

[0010] In one embodiment of the present invention, the control unit is further configured to determine the output current of the charging gun according to the request current of the charging gun when a single charging gun is charging, wherein the request current corresponds to the demand current of the device to be charged by the charging gun.

[0011] In one embodiment of the present invention, when multiple charging guns are charged simultaneously, the control unit adjusts the current according to the requested current of each charging gun of the multiple charging guns, the first current adjustment coefficient threshold Threshold_H, the second current adjustment coefficient threshold Threshold_L, the maximum heat dissipation power P of the heat dissipation module, and the maximum heat dissipation power P of the heat dissipation module. loss Max, and the resistance R of each charging gun cable , determine the output current of each charging gun, and wherein the first current adjustment coefficient threshold Threshold_H is greater than the second current adjustment coefficient threshold Threshold_L.

[0012] In one embodiment of the present invention, when the charging pile transitions from charging with a single charging gun to charging with multiple charging guns at the same time, the control unit is also used to initialize the output current of each of the multiple charging guns by evenly distributing or distributing in real time the output currents of the charging guns that have been charged and the newly added charging guns.

[0013] In one embodiment of the present invention, the plurality of charging guns include a first charging gun and a second charging gun, and the maximum allowable output current I of the first charging gun and the second charging gun is available Max and the resistance R cable Similarly, the maximum heat loss P of each charging gun charger Max satisfies the following formula:

[0014]

[0015] In one embodiment of the present invention, when the first charging gun and the second charging gun are charged at the same time, if the requested current of the first charging gun is I1 request , the initial output current is I1 available-1 , the ratio is Per1; if the requested current of the second charging gun is I2 request , the initial output current is I2 available-1 , whose ratio is Per2, then:

[0016] If Per1>Threshold_H and Per2<Threshold_L and Then: I2 available (New)=I2 request *1.1,

[0017] If Per1<Threshold_L and Per2>Threshold_H and Then: I1 available (New)=I1 request *1.1,

[0018] Among them, I1 available (New) is the updated output current of the first charging gun, I2 available (New) is the updated output current of the second charging gun.

[0019] In one embodiment of the present invention, when the charging pile transitions from being charged by the first charging gun or the second charging gun to being charged by the first charging gun and the second charging gun at the same time, the control unit is also used to initialize the output current of the first charging gun and the second charging gun by evenly distributing the output current of the charging gun that has been charged and the newly added charging gun.

[0020] In one embodiment of the present invention, when the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the maximum heat dissipation power P of the heat dissipation module. loss Max and the resistance R of each charging gun cable , determine the initial output current of each charging gun; wherein, if the first charging gun is a charging gun that has been charged, its initial output current is I1 available-1 The second charging gun is a newly added charging gun, and its initial output current is I2 available-1 , then:

[0021]

[0022] In one embodiment of the present invention, when the charging pile transitions from being charged by the first charging gun or the second charging gun to being charged by the first charging gun and the second charging gun at the same time, the control unit is also used to initialize the output current of the first charging gun and the second charging gun by real-time allocating the output current of the charging gun that has been charged and the output current of the newly added charging gun.

[0023] In one embodiment of the present invention, when the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the requested current and the original output current of the charging gun that has been added to the charging, the first current adjustment coefficient threshold Threshold_H, and the maximum heat dissipation power P of the heat dissipation module. loss Max, and the resistance R of each charging gun cable , determine the initial output current of the first charging gun and the second charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its original output current is I1 available-0 , the requested current is I1 request , the requested current I1 of the first charging gun request With the original output current I1 available-0 The ratio is Per0, and the initial output current of the first charging gun is I1 available-1 The second charging gun is a newly added charging gun, and its initial output current is I2 available-1 , then:

[0024] If Per0<Threshold_H, then: I1 available-1 =I1 request *1.1,

[0025]

[0026] Otherwise: I1 available-1 =I1 available-0 (1-Per0), I2 available-1 =I1 available-0 *Threshold_H.

[0027] In order to achieve the above object, the present invention further provides a power distribution method for a charging pile, wherein the charging pile comprises a plurality of charging guns and a single heat dissipation module, the plurality of charging guns are connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the power distribution method comprises:

[0028] When multiple charging guns are charged at the same time, a control unit is used to control the maximum heat dissipation power P of the heat dissipation module. loss Max and the maximum heat loss P of each charging gun in the plurality of charging guns charger Max, determines the output current of each charging gun, where the maximum heat dissipation power P of the heat dissipation module loss Max is greater than or equal to the maximum heat loss of any of the charging guns, and less than the sum of the maximum heat losses of each of the multiple charging guns;

[0029] A power distribution unit is used to distribute the power provided by a power module to the connected to-be-charged device through the corresponding charging gun according to the output current of each charging gun.

[0030] In another embodiment of the present invention, the power allocation method further includes: when a single charging gun is charging, using the control unit to determine the output current of the charging gun according to the request current of the charging gun, wherein the request current corresponds to the demand current of the device to be charged of the charging gun.

[0031] In another embodiment of the present invention, when multiple charging guns are charged at the same time, the control unit adjusts the current according to the requested current of each charging gun of the multiple charging guns, the first current adjustment coefficient threshold Threshold_H, the second current adjustment coefficient threshold Threshold_L, the maximum heat dissipation power P of the heat dissipation module, and the maximum heat dissipation power P of the heat dissipation module. loss Max, and the resistance R of each charging gun cable , determine the output current of each charging gun, and wherein the first current adjustment coefficient threshold Threshold_H is greater than the second current adjustment coefficient threshold Threshold_L.

[0032] In another embodiment of the present invention, when the charging pile transitions from charging with a single charging gun to charging with multiple charging guns at the same time, the control unit is used to initialize the output current of each of the multiple charging guns by evenly distributing or distributing in real time the output currents of the charging guns that have been charged and the newly added charging guns.

[0033] In another embodiment of the present invention, the plurality of charging guns include a first charging gun and a second charging gun, and the maximum allowable output current I of the first charging gun and the second charging gun is available Max and the resistance R cable are the same, the maximum heat loss P of each charging gun charger Max satisfies the following formula:

[0034]

[0035] In another embodiment of the present invention, when the first charging gun and the second charging gun are charged at the same time, if the request current of the first charging gun is I1 request , the initial output current is I1 available-1 , the ratio is Per1; if the requested current of the second charging gun is I2 request , the initial output current is I2 available-1 , whose ratio is Per2, then:

[0036] If Per1>Threshold_H and Per2<Threshold_L and Then: I2 available (New)=I2 request *1.1,

[0037] If Per1<Threshold_L and Per2>Threshold_H and Then: I1 available (New)=I1 request *1.1,

[0038] Among them, I1 available (New) is the updated output current of the first charging gun, I2 available (New) is the updated output current of the second charging gun.

[0039] In another embodiment of the present invention, the power allocation method also includes: when the charging pile transitions from charging with the first charging gun or the second charging gun to charging with the first charging gun and the second charging gun at the same time, the control unit is used to initialize the output current of the first charging gun and the second charging gun by evenly distributing the output current of the charging gun that has been charged and the newly added charging gun.

[0040] In another embodiment of the present invention, when the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the maximum heat dissipation power P of the heat dissipation module. loss Max and the resistance R of each charging gun cable , determine the initial output current of each charging gun; wherein, if the first charging gun is a charging gun that has been charged, its initial output current is I1 available-1 The second charging gun is a newly added charging gun, and its initial output current is I2 available-1 , then:

[0041]

[0042] In another embodiment of the present invention, the power distribution method also includes: when the charging pile transitions from charging with the first charging gun or the second charging gun to charging with the first charging gun and the second charging gun at the same time, the control unit is used to initialize the output current of the first charging gun and the second charging gun by real-time distributing the output current of the charging gun that has been charged and the output current of the newly added charging gun.

[0043] In another embodiment of the present invention, when the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the requested current and the original output current of the charging gun that has been added to the charging, the first current adjustment coefficient threshold Threshold_H, and the maximum heat dissipation power P of the heat dissipation module. loss Max, and the resistance R of each charging gun cable , determine the initial output current of the first charging gun and the second charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its original output current is I1 available-0 , the requested current is I1 request , the requested current I1 of the first charging gun request With the original output current I1 available-0 The ratio is Per0, and the initial output current of the first charging gun is I1 available-1 The second charging gun is a newly added charging gun, and its initial output current is I2 available-1 , then:

[0044] If Per0<Threshold_H, then: I1 available-1 =I1 request *1.1,

[0045]

[0046] Otherwise: I1 available-1 =I1 available-0 (1-Per0), I2 available-1 =I1 available-0 *Threshold_H.

[0047] In order to achieve the above-mentioned purpose, the present invention further provides a charging pile, which is characterized in that the charging pile includes multiple charging guns and a single heat dissipation module, the multiple charging guns are all connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the charging pile has the power distribution system as described above.

[0048] The present invention ensures maximum utilization of the heat dissipation module by allowing multiple charging guns to share a heat dissipation module and dynamically controlling the output current of each charging gun, thereby effectively improving both the output efficiency and the heat dissipation efficiency of the system.

[0049] Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0051] Figure 1 This is a schematic diagram of the structure of a charging pile equipped with two guns and its power distribution system according to a preferred embodiment of the present invention;

[0052] Figure 2 The maximum heat dissipation power P of the heat dissipation module of the charging pile equipped with two guns of the present invention loss Schematic diagram of the dynamic change between Max and the output current of the dual guns;

[0053] Figure 3 It is a schematic diagram of a flow chart of initializing the output currents of the dual guns by an even distribution method when the charging pile equipped with dual guns of the present invention enters the dual gun mode from the single gun mode;

[0054] Figure 4 It is a schematic diagram of a flow chart of initializing the output current of the dual guns by real-time distribution when the charging pile equipped with dual guns of the present invention enters the dual gun mode from the single gun mode;

[0055] Figure 5 It is a schematic diagram of the flow chart of the power distribution method of the charging pile of the present invention. DETAILED DESCRIPTION

[0056] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0057] When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", "the", "said", and "at least one" are used to indicate the presence of one or more elements / components / etc. The terms "comprises", "includes", and "have" are used to indicate an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc. Relative terms may be used in the embodiments, such as "upper" or "lower" to describe the relative relationship of one component of the icon to another component. It is understood that if the device of the icon is turned over so that it is upside down, the component described on the "upper" side will become the component on the "lower" side. In addition, the terms "first", "second", etc. in the claims are used only as labels and are not numerical limitations on their objects.

[0058] like Figure 1As shown, it shows the structure of a charging pile 100 equipped with two charging guns and its power distribution system 10 of a preferred embodiment of the present invention. Among them, the charging pile 100 includes two charging guns 30, namely a first charging gun 31 (charging gun 1 in the figure) and a second charging gun 32 (charging gun 2 in the figure), and these charging guns 30 are connected to a single heat dissipation module 20 and dissipate heat through heat exchange. The heat dissipation module 20 can be, for example, a liquid cooling heat dissipation module. It can be understood that although Figure 1 Only two charging guns 30 are shown in the figure, but in other embodiments, the charging pile 100 may also include other numbers of charging guns, such as 3 or more, which is not intended to limit the present invention.

[0059] In this embodiment, the charging pile 100 also has a power distribution system 10, which includes, for example, a power module 11, a control unit 12, and a power distribution unit 13. The power module 11 can be used to provide power to the two charging guns 30. The control unit 12 can be connected to the power module 11 and the heat dissipation module 20, and is used to distribute the power to the two charging guns 30 according to the maximum heat dissipation power P of the heat dissipation module 20 when the two charging guns 30 are charged at the same time. loss Max and the maximum heat loss P of each charging gun charger Max, determines the output current of each charging gun, where the maximum heat dissipation power P of the heat dissipation module 20 loss Max is greater than or equal to the maximum heat loss of any charging gun, and less than the sum of the maximum heat losses of the two charging guns 30. The power distribution unit 13 can be connected to the power module 11 and the control unit 12, and is used to distribute the power provided by the power module 11 to the connected charging device (not shown) through the corresponding charging gun 30 according to the output current of each charging gun.

[0060] Preferably, the control unit 12 is, for example, in communication connection with the power module 11, in control connection with the power distribution unit 13, and in control connection with the heat dissipation module 20. The device to be charged may include, for example, but is not limited to, an electric vehicle.

[0061] Preferably, the control unit 12 can also be used to determine the output current of the charging gun according to the request current of the charging gun when a single charging gun is charging, wherein the request current of the charging gun corresponds to the demand current of the device to be charged connected to the charging gun.

[0062] Preferably, when the charging pile 100 transitions from charging with a single charging gun to charging with two charging guns 30 at the same time, the control unit 12 can also be used to initialize the output current of each of the two charging guns 30 by evenly distributing or distributing in real time (which will be described in detail later) the output current of the charging gun that has been charged and the newly added charging gun.

[0063] In the present invention, for the charging gun 30 (including the cable and the gun head) of the charging pile 100, when the length is constant, its resistance value is a constant value R, wherein R is affected by temperature.

[0064] For example, Figure 1 Assume that the resistance values ​​of the two charging guns at room temperature (T0) are R1 and R2, respectively. T0 and R2 T0 After the system has been charging for a period of time, the cable temperature rises to T1, and the resistance values ​​of the two guns will become R1 T1 and R2 T1 , as shown below:

[0065] R1 T1 =R1 T0 (1+αT1)(Formula 1)

[0066] R2 T1 =R2 T0 (1+αT1)(Formula 2)

[0067] Wherein, αT1 is a value greater than 0. For a charging gun system with heat dissipation capability like the present invention, under the monitoring of the control algorithm, it can be ensured that the system always works at the maximum output capacity.

[0068] by Figure 1 Taking the charging pile 100 equipped with two guns as an example, the maximum heat dissipation power of the heat dissipation module 20 is defined as P loss Max, define the resistance of the first charging gun 31 and the second charging gun 32 as R1 cable and R2 cable , the maximum allowable output current of the first charging gun 31 and the second charging gun 32 are defined as I1 available Max and I2 available Max, defines the maximum heat loss of the charging gun as P charger Max, then the maximum heat loss of the first charging gun 31 is The maximum heat loss of the second charging gun 32 is And if Figure 1 The system of the present invention shown satisfies:

[0069] and

[0070]

[0071] Formula (3) indicates that the maximum heat dissipation power of the heat dissipation module 20 is greater than or equal to the maximum heat loss of any charging gun in the dual guns, and is less than the sum of the maximum heat losses of each of the dual guns.

[0072] If Figure 1 In the dual-charger charging system shown, the first charging gun 31 and the second charging gun 32 have the same specifications, and then:

[0073] R1 cable =R2 cable and I1 available Max=I2 available Max

[0074] Define the resistance of the charging gun as R cable , the maximum allowable output current of the charging gun is defined as I available Max, then the above equation (3) of the system can be simplified to:

[0075]

[0076] And, when the maximum allowable output current of each of the two guns is I available Max and resistor R cable At the same time, the maximum heat loss of each charging gun P charger Max satisfies the following formula:

[0077]

[0078] When Figure 1 When the dual-gun charging system shown is charging, the output current I1 of the dual-gun is available and I2 available It changes dynamically, and the output current I1 of the dual guns available and I2 available The following relationship applies:

[0079]

[0080] Right now,

[0081] like Figure 2 As shown, it shows the relationship function of the above formula (7), that is, it shows the maximum heat dissipation power P of the heat dissipation module loss Max and double gun output current I1 available and I2 available The dynamic relationship between Figure 2 It can be seen that when the value is at the coordinates shown in the figure, the output current of the dual-gun charging system is the largest. At this time, the output current I1 of the dual-gun available and I2 available satisfy:

[0082]

[0083] In this embodiment, when Figure 1When the dual-gun charging system shown transitions from charging with a single charging gun (i.e., single-gun mode) to charging with two charging guns at the same time (i.e., dual-gun mode), the control unit 12 can also be used to initialize the output currents of the two charging guns by evenly distributing or distributing in real time the output currents of the charging gun that has been charged and the newly added charging gun. After the initialization is completed, the dual-gun charging system can be charged in a steady state through the two charging guns at the same time.

[0084] like Figure 3 As shown, it shows that Figure 1 The dual-gun charging system shown in the figure is a process in which the output current of the dual guns is initialized by an even distribution method when the single-gun mode enters the dual-gun mode, wherein it is assumed that the first charging gun 31 is a charging gun that has been added to the charging, and the second charging gun 32 is a charging gun that is newly added to the charging.

[0085] exist Figure 3 In the example, the requested current of charging gun 1 (i.e., the first charging gun 31) is defined as I1 request , the initial output current is I1 available-1 , whose ratio is Per1, that is Define the requested current of charging gun 2 (i.e., the second charging gun 32) as I2 request , the initial output current is I2 available-1 , whose ratio is Per2, that is The first current adjustment coefficient threshold is defined as Threshold_H, for example, Threshold_H=0.95. The second current adjustment coefficient threshold is defined as Threshold_L, for example, Threshold_L=0.80.

[0086] When the second charging gun 32 is newly charged, the system enters the dual-gun mode from the single-gun mode. At this time, the output currents of the first charging gun 31 and the second charging gun 32 must be initialized. For example, when the control unit 12 initializes the output currents of the first charging gun 31 and the second charging gun 32, the maximum heat dissipation power P of the heat dissipation module 20 can be used. loss Max and the resistance R of each charging gun cable , determine the initial output current of each charging gun. If the initial output current of the first charging gun 31 is I1 available-1 , the initial output current of the second charging gun 32 is I2 available-1 , then: The output current of the two guns will be evenly distributed.

[0087] After initialization, the control unit 12 can adjust the current according to the requested current of each charging gun of the two charging guns 30, the first current adjustment coefficient threshold Threshold_H, the second current adjustment coefficient threshold Threshold_L, the maximum heat dissipation power P of the heat dissipation module 20, and the maximum heat dissipation power P of the heat dissipation module 20. loss Max, and the resistance R of each charging gun cable , determine the output current of each charging gun, and the first current adjustment coefficient threshold Threshold_H is greater than the second current adjustment coefficient threshold Threshold_L, so that the corresponding charging guns in the two charging guns 30 can be used to charge the connected devices at the same time according to the determined output current.

[0088] More specifically, when the first charging gun 31 and the second charging gun 32 are charged simultaneously, if the requested current of the first charging gun 31 is I1 request , the initial output current is I1 available-1 , the ratio is Per1; if the requested current of the second charging gun 32 is I2 request , the initial output current is I2 available-1 , whose ratio is Per2, then:

[0089] If Per1<Threshold_L and Per2>Threshold_H and Then: I1 available (New)=I1 request *1.1,

[0090] If Per1>Threshold_H and Per2<Threshold_L and Then: I2 available (New)=I2 request *1.1,

[0091] Among them, I1 available (New) is the updated output current of the first charging gun 31, I2 available (New) is the updated output current of the second charging gun 32 .

[0092] Furthermore, when Per1=0 or Per2=0, the system exits the dual-gun mode.

[0093] like Figure 4 As shown, it shows that Figure 1The dual-gun charging system shown in the figure is a process in which the output current of the dual guns is initialized by real-time distribution when the single-gun mode enters the dual-gun mode, wherein it is assumed that the first charging gun 31 is a charging gun that has been added to the charging, and the second charging gun 32 is a charging gun that is newly added to the charging, and the output current of the second charging gun 32 is distributed in real time according to the value of the output current of the first charging gun 31.

[0094] exist Figure 4 In the example, the original output current of charging gun 1 (i.e., the first charging gun 31) is defined as I1 available-0 , the initial output current is I1 available-1 , the requested current is I1 request , and define the requested current I1 request With the original output current I1 available-0 The ratio is Per0, that is And define the requested current I1 request With the initial output current I1 available-1 The ratio is Per1, that is Define the requested current of charging gun 2 (i.e., the second charging gun 32) as I2 request , the initial output current is I2 available-1 , whose ratio is Per2, that is The first current adjustment coefficient threshold is defined as Threshold_H, for example, Threshold_H=0.95. The second current adjustment coefficient threshold is defined as Threshold_L, for example, Threshold_L=0.80.

[0095] When the second charging gun 32 is newly added to the charging, the system enters the dual-gun mode from the single-gun mode. At this time, the output currents of the first charging gun 31 and the second charging gun 32 must be initialized. For example, when the control unit 12 initializes the output currents of the first charging gun 31 and the second charging gun 32, it can be based on the request current I1 of the first charging gun 31 that has been added to the charging. request and the original output current I1 available-0 , the first current adjustment coefficient threshold Threshold_H, the maximum heat dissipation power P of the heat dissipation module 20 loss Max, and the resistance R of each charging gun cable , determine the initial output current of the first charging gun 31 and the second charging gun 32. If the initial output current of the first charging gun 31 is I1 available-1 , the initial output current of the second charging gun 32 is I2 available-1 , then:

[0096] If Per0<Threshold_H, then: I1 available-1 =I1 request *1.1,

[0097]

[0098] Otherwise: I1 available-1 =I1 available-0 (1-Per0), I2 available-1 =I1 available-0 *Threshold_H, so that initialization can be achieved.

[0099] After initialization, the control unit 12 can adjust the current according to the requested current of each charging gun of the two charging guns 30, the first current adjustment coefficient threshold Threshold_H, the second current adjustment coefficient threshold Threshold_L, the maximum heat dissipation power P of the heat dissipation module 20, and the maximum heat dissipation power P of the heat dissipation module 20. loss Max, and the resistance R of each charging gun cable , determine the output current of each charging gun, and the first current adjustment coefficient threshold Threshold_H is greater than the second current adjustment coefficient threshold Threshold_L, so that the corresponding charging guns in the two charging guns 30 can be used to charge the connected devices at the same time according to the determined output current.

[0100] More specifically, when the first charging gun 31 and the second charging gun 32 are charged simultaneously, if the requested current of the first charging gun 31 is I1 request , the initial output current is I1 available-1 , the ratio is Per1; if the requested current of the second charging gun 32 is I2 request , the initial output current is I2 available-1 , whose ratio is Per2, then:

[0101] If Per1<Threshold_L and Per2>Threshold_H and Then: I1 available (New)=I1 request *1.1,

[0102] If Per1>Threshold_H and Per2<Threshold_L and Then: I2 available (New)=I2 request *1.1,

[0103] Among them, I1 available (New) is the updated output current of the first charging gun 31, I2 available (New) is the updated output current of the second charging gun 32 .

[0104] Furthermore, when Per1=0 or Per2=0, the system exits the dual-gun mode.

[0105] The following will be Figure 1 Taking the dual-gun system shown as an example, several application scenarios of the charging pile of the present invention are described in detail.

[0106] Application scenario 1: Single-gun charging

[0107] When the demand current I of the device to be charged (such as an electric vehicle) request Not greater than the maximum allowable output current I of a single gun available Max (i.e. I request <I available Max), the actual output current of the charging gun is:

[0108] I available =I request .

[0109] Application scenario 2: Charging two guns at the same time

[0110] When the first charging gun 31 and the second charging gun 32 are charged at the same time, if the request current of the first charging gun 31 is I1 request , the initial output current is I1 available-1 , the ratio is Per1; if the requested current of the second charging gun 32 is I2 request , the initial output current is I2 available-1 , whose ratio is Per2, then:

[0111] If Per1<Threshold_L and Per2>Threshold_H and Then: I1 available (New)=I1 request *1.1,

[0112] If Per1>Threshold_H and Per2<Threshold_L and Then: I2 available (New)=I2 request *1.1,

[0113] Among them, I1 available (New) is the updated output current of the first charging gun 31, I2 available (New) is the updated output current of the second charging gun 32 .

[0114] Application scenario 3: Transition from single-gun charging to dual-gun simultaneous charging

[0115] This application scenario is a dynamic process, in which:

[0116] (1) The working principle when charging a single gun is the same as that in application scenario 1, and the working principle when charging two guns at the same time is the same as that in application scenario 2;

[0117] (2) In the transition state, assuming that the new charging gun 32 is the second charging gun 32 (the same applies when the new charging gun 31 is the first charging gun 31), the required current is I2 request , the system can be initialized in the following two ways:

[0118] Method 1 (average distribution method, such as Figure 3 As shown): If the initial output current of the first charging gun 31 is I1 available-1 , the initial output current of the second charging gun 32 is I2 available-1 , then:

[0119]

[0120] Method 2 (real-time allocation method, such as Figure 4 As shown): If the original output current of the first charging gun 31 is I1 available-0 , the initial output current is I1 available-1 , the requested current is I1 request ,and The initial output current of the second charging gun 32 is I2 available-1 , then:

[0121] If Per0<Threshold_H, then: I1 available-1 =I1 request *1.1,

[0122]

[0123] Otherwise: I1 available-1 =I1 available-0 (1-Per0), I2 available-1 =I1 available-0 *Threshold_H.

[0124] (3) When two guns are charged simultaneously in a steady state, the working principle is similar to that in application scenario 2.

[0125] Scenario 4: Transition from dual-gun charging to single-gun charging

[0126] This application scenario is a dynamic process, in which:

[0127] (1) When two guns are charged simultaneously, the working principle is the same as that of application scenario 2; when a single gun is charged, the working principle is the same as that of application scenario 1;

[0128] (2) In the transition state: Assuming that the second charging gun 32 ends charging (the same applies when the first charging gun 31 ends charging), the output current of the first charging gun 31 is:

[0129] I1 available =I1 request .

[0130] Although the above is Figure 1 The dual-gun system shown is taken as an example to illustrate the charging pile and its power distribution method of the present invention, but it can be understood that the working principle and power distribution method are also applicable to the charging pile including three or more charging guns, which will not be repeated here.

[0131] like Figure 5 As shown, combined with reference Figure 1 , the power allocation method 500 of the present invention may include:

[0132] Step S51: when multiple charging guns are charged simultaneously, a control unit is used to control the maximum heat dissipation power P of the heat dissipation module. loss Max and the maximum heat loss P of each charging gun charger Max, determines the output current of each charging gun, where the maximum heat dissipation power P of the heat dissipation module loss Max is greater than or equal to the maximum heat loss of any charging gun, and less than the sum of the maximum heat losses of each of the multiple charging guns;

[0133] Step S52: using a power distribution unit to distribute the power provided by a power module to the connected charging device through the corresponding charging gun according to the output current of each charging gun.

[0134] Preferably, the power allocation method 500 may further include: when a single charging gun is charging, using the control unit 12 to determine the output current of the charging gun according to the request current of the charging gun, wherein the request current corresponds to the demand current of the device to be charged of the charging gun.

[0135] Preferably, when multiple charging guns 30 are charged simultaneously, the control unit 12 adjusts the current according to the requested current of each charging gun of the multiple charging guns 30, the first current adjustment coefficient threshold Threshold_H, the second current adjustment coefficient threshold Threshold_L, the maximum heat dissipation power P of the heat dissipation module 20, and the maximum heat dissipation power P of the heat dissipation module 20. loss Max, and the resistance R of each charging gun cable , determine the output current of each charging gun, and wherein the first current adjustment coefficient threshold Threshold_H is greater than the second current adjustment coefficient threshold Threshold_L.

[0136] Preferably, when the charging pile 100 transitions from charging with a single charging gun to charging with multiple charging guns at the same time, the control unit 12 is used to initialize the output current of each of the multiple charging guns by evenly distributing or distributing in real time the output currents of the charging guns that have been charged and the newly added charging guns.

[0137] The present invention can dynamically adjust the output current of each of the multiple charging guns of the charging pile, ensuring that the liquid cooling heat dissipation module is utilized to the maximum extent for heat dissipation, so that both the output efficiency and the heat dissipation efficiency of the system can be effectively improved.

[0138] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the disclosed embodiments, but rather is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A power distribution system for a charging pile, It is characterized in that The charging pile includes a plurality of charging guns and a single heat dissipation module, the plurality of charging guns are connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the power distribution system includes: A power module, used to provide power to the multiple charging guns; A control unit is connected to the power module and the heat dissipation module. When the multiple charging guns are charged at the same time, the control unit controls the maximum heat dissipation power of the heat dissipation module and the maximum heat loss of each charging gun. , determine the maximum allowable output current of each charging gun, where the maximum heat dissipation power of the heat dissipation module is greater than or equal to the maximum heat loss of any of the charging guns, and is less than the sum of the maximum heat losses of each of the multiple charging guns, the multiple charging guns include a first charging gun and a second charging gun, and the maximum allowable output current of the first charging gun and the second charging gun And resistor Similarly, the maximum heat loss of each charging gun Satisfies the following formula: ； A power distribution unit is connected to the power module and the control unit, and is used to distribute the power provided by the power module to the connected to-be-charged device through the corresponding charging gun according to the output current of each charging gun.

2. The power distribution system according to claim 1, It is characterized in that The control unit is further configured to determine the output current of the charging gun according to a request current of the charging gun when a single charging gun is charging, wherein the request current corresponds to a demand current of a device to be charged by the charging gun.

3. The power distribution system according to claim 1, It is characterized in that When multiple charging guns are charged at the same time, the control unit is based on the requested current of each charging gun of the multiple charging guns, the first current adjustment coefficient threshold , the second current adjustment coefficient threshold , the maximum heat dissipation power of the heat dissipation module , and the resistance of each charging gun , determine the output current of each charging gun, and wherein the first current adjustment coefficient threshold Greater than the second current adjustment factor threshold .

4. The power distribution system according to claim 1, It is characterized in that When the charging pile transitions from charging with a single charging gun to charging with multiple charging guns at the same time, the control unit is also used to initialize the output current of each of the multiple charging guns by evenly distributing or distributing in real time the output currents of the charging guns that have been charged and the newly added charging guns.

5. The power distribution system according to claim 3, It is characterized in that When the first charging gun and the second charging gun are charged at the same time, if the request current of the first charging gun is , the initial output current is , whose ratio is ; If the requested current of the second charging gun is , the initial output current is , whose ratio is , then: if and and ,but: , ; if and and ,but: , ; in, is the updated output current of the first charging gun, is the updated output current of the second charging gun.

6. The power distribution system according to claim 5, It is characterized in that When the charging pile transitions from charging with the first charging gun or the second charging gun to charging with the first charging gun and the second charging gun at the same time, the control unit is also used to initialize the output current of the first charging gun and the second charging gun by evenly distributing the output current of the charging gun that has been charged and the newly added charging gun.

7. The power distribution system according to claim 6, It is characterized in that When the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the maximum heat dissipation power of the heat dissipation module. And the resistance of each charging gun , determine the initial output current of each charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its initial output current is The second charging gun is a newly added charging gun, and its initial output current is , then: 。 8. The power distribution system according to claim 5, It is characterized in that When the charging pile transitions from charging with the first charging gun or the second charging gun to charging with the first charging gun and the second charging gun at the same time, the control unit is also used to initialize the output current of the first charging gun and the second charging gun by real-time allocating the output current of the charging gun that has been charged and the output current of the newly added charging gun.

9. The power distribution system according to claim 8, It is characterized in that When the control unit initializes the output current of the first charging gun and the second charging gun, the control unit determines the output current of the first charging gun and the second charging gun according to the requested current and the original output current of the charging gun that has been charged, and the first current adjustment coefficient threshold. , the maximum heat dissipation power of the heat dissipation module , and the resistance of each charging gun , determine the initial output current of the first charging gun and the second charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its original output current is , the requested current is , the requested current of the first charging gun With the original output current The ratio is Per0, and the initial output current of the first charging gun is The second charging gun is a newly added charging gun, and its initial output current is , then: if ,but: , ; otherwise: , .

10. A power distribution method for a charging pile, It is characterized in that The charging pile includes a plurality of charging guns and a single heat dissipation module, the plurality of charging guns are connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the power distribution method includes: When multiple charging guns are charged at the same time, a control unit is used to control the maximum heat dissipation power of the heat dissipation module. and the maximum heat loss of each of the plurality of charging guns , determine the maximum allowable output current of each charging gun, where the maximum heat dissipation power of the heat dissipation module is greater than or equal to the maximum heat loss of any of the charging guns, and is less than the sum of the maximum heat losses of each of the multiple charging guns, the multiple charging guns include a first charging gun and a second charging gun, and the maximum allowable output current of the first charging gun and the second charging gun And the resistor are the same, the maximum heat loss of each charging gun Satisfies the following formula: ； A power distribution unit is used to distribute the power provided by a power module to the connected to-be-charged device through the corresponding charging gun according to the output current of each charging gun.

11. The power distribution method according to claim 10, It is characterized in that Also includes: When a single charging gun is charging, the control unit is used to determine the output current of the charging gun according to the request current of the charging gun, wherein the request current is the demand current of the device to be charged corresponding to the charging gun.

12. The power distribution method according to claim 10, It is characterized in that When multiple charging guns are charged at the same time, the control unit is based on the requested current of each charging gun of the multiple charging guns, the first current adjustment coefficient threshold , the second current adjustment coefficient threshold , the maximum heat dissipation power of the heat dissipation module , and the resistance of each charging gun , determine the output current of each charging gun, and wherein the first current adjustment coefficient threshold Greater than the second current adjustment factor threshold .

13. The power distribution method according to claim 10, It is characterized in that When the charging pile transitions from charging with a single charging gun to charging with multiple charging guns at the same time, the control unit is used to initialize the output current of each of the multiple charging guns by evenly distributing or distributing in real time the output currents of the charging guns that have been charged and the newly added charging guns.

14. The power distribution method according to claim 12, It is characterized in that When the first charging gun and the second charging gun are charged at the same time, if the request current of the first charging gun is , the initial output current is , whose ratio is ; If the requested current of the second charging gun is , the initial output current is , whose ratio is , then: if and and ,but: , ; if and and ,but: , ; in, is the updated output current of the first charging gun, is the updated output current of the second charging gun.

15. The power distribution method according to claim 14, It is characterized in that Also includes: When the charging pile transitions from being charged by the first charging gun or the second charging gun to being charged by the first charging gun and the second charging gun at the same time, the control unit is used to initialize the output current of the first charging gun and the second charging gun by evenly distributing the output current of the charging gun that has been charged and the newly added charging gun.

16. The power distribution method according to claim 15, It is characterized in that When the control unit initializes the output current of the first charging gun and the second charging gun, it is based on the maximum heat dissipation power of the heat dissipation module. And the resistance of each charging gun , determine the initial output current of each charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its initial output current is The second charging gun is a newly added charging gun, and its initial output current is , then: 。 17. The power allocation method according to claim 14, It is characterized in that Also includes: When the charging pile transitions from being charged by the first charging gun or the second charging gun to being charged by the first charging gun and the second charging gun at the same time, the control unit is used to initialize the output current of the first charging gun and the second charging gun by real-time allocating the output current of the charging gun that has been charged and the output current of the newly added charging gun.

18. The power distribution method according to claim 17, It is characterized in that When the control unit initializes the output current of the first charging gun and the second charging gun, the control unit determines the output current of the first charging gun and the second charging gun according to the requested current and the original output current of the charging gun that has been charged, and the first current adjustment coefficient threshold. , the maximum heat dissipation power of the heat dissipation module , and the resistance of each charging gun , determine the initial output current of the first charging gun and the second charging gun; wherein, if the first charging gun is a charging gun that has been added to the charging, its original output current is , the requested current is , the requested current of the first charging gun With the original output current The ratio is Per0, and the initial output current of the first charging gun is The second charging gun is a newly added charging gun, and its initial output current is , then: if ,but: , ; otherwise: , .

19. A charging pile, It is characterized in that The charging pile includes a plurality of charging guns and a single heat dissipation module, the plurality of charging guns are connected to the heat dissipation module and dissipate heat therewith through heat exchange, and the charging pile has a power distribution system as described in any one of claims 1 to 9.

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