Charging device, system and method

Abstract

The present application provides a charging device and system, which converts AC power into DC power through multiple charging module groups to provide power for the charging gun; the charging module group is connected to the charging gun through a power distribution device; wherein the power distribution device includes a high-voltage relay connected to the charging module group and a low-voltage relay connected to the high-voltage relay and the charging gun respectively; according to the charging demand of the charging demander obtained by the charging control device, the charging module group that outputs power is allocated to the charging gun by controlling the opening and closing of the high-voltage relay and the low-voltage relay, thereby providing power for the charging demander to charge. The charging module group is allocated by combining high-voltage relays and low-voltage relays to achieve power distribution. It not only ensures safety, but also can flexibly allocate charging power. The present application also provides a charging method corresponding to the charging device and system.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to a charging device, system and method. Background Art

[0002] Most of the existing electric vehicle charging piles are still single-pile models, and the output power of each charging pile is fixed. Since different electric vehicles have different charging power requirements, fixed output power is prone to waste of electric power or charging time being too long.

[0003] Therefore, we are now gradually adopting the method of allocating corresponding output power according to the charging needs of different electric vehicles to just meet the charging needs, avoiding the problem of waste of electric power due to excessive output power or excessively small output power causing the actual charging time to be too long.

[0004] In the prior art, high-voltage relays are used to distribute power, but the cost of high-voltage relays is high and the large size makes them difficult to install. Due to the size limitation, it is difficult to install multiple high-voltage relays in the same device, so the flexibility of power distribution is relatively poor.

[0005] Low-voltage relays are also used for power distribution. Although low-voltage relays are low in cost, small in size, and highly flexible, since the charging voltage is high, there are certain safety hazards in controlling high voltage with low-voltage relays. Improper operation, abnormal control, or interference with equipment may cause damage to the equipment and even cause certain dangers.

[0006] Therefore, how to flexibly allocate charging power to electric vehicles while ensuring safety and reliability has become an urgent problem to be solved. Summary of the invention

[0007] Based on the above-mentioned deficiencies of the prior art, the present invention proposes a charging device, system and method to solve the problems of poor flexibility and low safety when allocating charging power.

[0008] To solve the above problems, the following solutions are proposed:

[0009] A first aspect of the present invention provides a charging device, comprising:

[0010] Multiple charging module groups, used to convert AC power into DC power to provide DC power for the charging gun; wherein each charging module group includes at least one charging module;

[0011] A power distribution device connected to the output ends of the plurality of charging module groups, for allocating the charging module groups to the charging guns according to the charging demands of the charging demanders acquired by the charging control device, thereby providing electric energy to the charging demanders;

[0012] Wherein, the power distribution device comprises:

[0013] A high-voltage relay connected to the charging module group; one of the high-voltage relays is connected to one of the charging module groups;

[0014] A low voltage relay connected to the output end of the high voltage relay and the charging gun respectively.

[0015] Optionally, in the above charging device, the output end of one high-voltage relay is connected in parallel to a plurality of low-voltage relays, and one low-voltage relay is connected to one charging gun.

[0016] Optionally, in the above charging device, each of the charging module groups can only be connected to one of the charging guns through the high-voltage relay and the low-voltage relay at any time to provide power to the one of the charging guns.

[0017] Based on the above charging device, the second aspect of the present invention provides a charging system, including:

[0018] A plurality of charging module groups, used for converting AC power into DC power; wherein each charging module group includes at least one charging module;

[0019] A power distribution device connected to the output ends of the plurality of charging module groups; wherein the power distribution device comprises a high-voltage relay connected to the charging module group and a low-voltage relay connected to the output end of the high-voltage relay, and one of the high-voltage relays is connected to one of the charging module groups;

[0020] A charging gun connected to the output end of the low-voltage relay is used to connect to a charging demander to charge the charging demander;

[0021] The charging control device connected to the power distribution device is used to obtain the charging demand of the charging demander, and distribute the charging module group to provide power to the charging gun used by the charging demander by controlling the opening and closing of the high-voltage relay and the low-voltage relay according to the charging demand.

[0022] Optionally, in the above charging system, the output end of one high-voltage relay is connected in parallel to a plurality of the low-voltage relays, and one low-voltage relay is connected to one charging gun.

[0023] Optionally, in the above charging system, each of the charging module groups can only be connected to one of the charging guns through the high-voltage relay and the low-voltage relay at any time to provide power to the one of the charging guns.

[0024] A third aspect of the present invention provides a charging method, comprising:

[0025] Obtain charging needs of charging demanders;

[0026] The charging power is calculated according to the charging demand and the usage of the charging module group; wherein the charging module group outputs electric energy to the charging demander through a high-voltage relay and a low-voltage relay;

[0027] According to the charging power, the high-voltage relay and the low-voltage relay are controlled to open and close, so as to allocate the charging module group to the charging demander to provide electric energy for charging.

[0028] Optionally, in the above charging method, controlling the opening and closing of the high-voltage relay and the low-voltage relay according to the charging power to allocate the charging module group to the charging demander to provide electric energy for charging includes:

[0029] Starting the assigned charging module group, and determining whether the voltage difference between the output voltage of the charging module group and the voltage at the output end of the low-voltage relay is within a preset range;

[0030] If it is determined that the voltage difference between the output voltage of the charging module group and the voltage at the output end of the low-voltage relay is within a preset range, the low-voltage relay corresponding to the charging module group is closed first, and then the high-voltage relay corresponding to the charging module group is closed to output electric energy for charging to the charging demander.

[0031] Optionally, in the above method, it also includes:

[0032] When the charging demander needs to stop outputting electric energy to the charging demander, the corresponding charging module group is first shut down, then the high-voltage relay corresponding to the charging module group is disconnected, and finally the low-voltage relay corresponding to the charging module group is disconnected to stop outputting electric energy to the charging demander.

[0033] Optionally, in the above charging system, there are multiple charging demanders, and after calculating and obtaining the charging power, the method further includes:

[0034] Sorting the multiple charging demanders into charging order to obtain charging priority levels;

[0035] Wherein, allocating the charging module group to provide electric energy to the charging demander according to the charging power includes:

[0036] According to the charging priority level, the charging power corresponding to each charging demand is controlled in turn by opening and closing the high-voltage relay and the voltage relay to allocate the charging module group to the multiple charging demanders to provide electric energy for charging.

[0037] The present invention provides electric energy for charging needs through multiple charging module groups. Power distribution is achieved by allocating charging modules that provide electric energy to charging demanders according to charging needs. First, the high voltage output by the charging module group is directly controlled by a high-voltage relay connected to the charging module group, thereby avoiding the unsafe problem of directly controlling the high voltage through a low-voltage relay. Then the output end of the high-voltage relay is connected to the low-voltage relay, and the charging gun is connected through the low-voltage relay. Because the low-voltage relay is small in size, multiple low-voltage relays can be connected to the output end of the high-voltage relay, thereby connecting to multiple charging guns. Each charging gun can arbitrarily call the charging power of each charging module to achieve flexible distribution of charging power. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of a charging device provided by an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of a charging device provided by another embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the structure of a charging system provided by another embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the structure of a charging system provided by another embodiment of the present invention;

[0043] Figure 5 A flowchart of a charging method provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] An embodiment of the present invention provides a charging device, such as Figure 1 As shown, including:

[0046] Multiple charging module groups 101 and a power distribution device 102 .

[0047] Output ends of the plurality of charging module groups 101 are connected to a power distribution device 102 .

[0048] Each charging module group 101 includes at least one charging module, which is used to convert AC power into DC power and provide DC power to the charging gun to meet the charging current requirements of the charging user.

[0049] The power distribution device 102 is used to allocate a charging module group 101 to a charging gun for charging the charging demander according to the charging demand of the charging demander acquired by the charging control device, so as to provide electric energy to the charging demander.

[0050] The power distribution device 102 includes a high voltage relay 103 and a low voltage relay 104 .

[0051] The high-voltage relay 103 is connected to the charging module group 101 ; one high-voltage relay 103 is connected to one charging module group 101 .

[0052] The low voltage relay 104 is connected to the output end of the high voltage relay 103 and the charging gun respectively.

[0053] That is to say, the charging module group 101 is connected to the charging gun through the high-voltage relay 103 and the low-voltage relay 104 to output electric energy for the charging gun. The output end of each charging module group 101 is connected to the input end of a high-voltage relay 103, the output end of the high-voltage relay 103 is connected to the input end of the low-voltage relay 104, and the output end of the low-voltage relay 104 is connected to the charging gun. Thus, by controlling the opening and closing of the high-voltage relay and the low-voltage relay, the corresponding charging module group 101 can be allocated to provide electric energy or stop outputting electric energy for the charging demander. When the high-voltage relay 103 and the low-voltage relay 104 connected to the charging module group 101 are closed, the charging module group is connected to the charging gun and outputs electric energy for the charging gun. Similarly, when the corresponding high-voltage relay 103 and the low-voltage relay 104 are disconnected, the charging module group 101 is disconnected from the charging gun and stops outputting electric energy for the charging gun.

[0054] In this embodiment, when the charging demander uses the charging device to charge, the power distribution device 102 allocates the charging module group 101 to the charging gun for charging the charging demander according to the charging demand of the charging demander obtained by the charging control device. By controlling the opening and closing of the high-voltage relay 103 and the low-voltage relay 104, the allocation of the corresponding charging module group 101 is realized, and the charging demander is provided with electric energy that meets the charging demand, and the charging demander is charged.

[0055] The charging device provided by the embodiment of the present invention includes a plurality of charging module groups 101 and a power distribution device 102, wherein the power distribution device 102 includes a high-voltage relay 103 and a low-voltage relay 104. The charging module group 101 is connected to the high-voltage relay 103, the high-voltage relay 103 is connected to the low-voltage relay 104, and then connected to the charging gun through the low-voltage relay 104. The power distribution device 102 allocates the charging module group 101 to the charging gun according to the charging needs of the charging demander by controlling the opening and closing of the corresponding high-voltage relay 103 and the low-voltage relay 104, thereby providing the charging demander with appropriate charging power for charging. The high voltage output of the charging module group 101 is directly controlled by the high-voltage relay 103 to ensure the safety of charging, and then the charging gun is connected to the relatively small low-voltage relay 104 to achieve flexible power distribution. While ensuring safety and reliability, the output power can meet the charging needs to the greatest extent, which not only avoids the problem of long charging time caused by insufficient output power, but also avoids the problem of waste of electric power caused by excessive output power.

[0056] Optionally, in another specific embodiment of the present invention, Figure 2 As shown, the output end of a high-voltage relay 203 is connected in parallel to a plurality of low-voltage relays 204 , and one of the low-voltage relays 204 is connected to one of the charging guns.

[0057] It should be noted that the output end of each high-voltage relay 203 can be connected to multiple low-voltage relays 204, that is, each charging module group is connected to part or all of the charging guns through a high-voltage relay and multiple low-voltage relays, so that the charging module group 201 can be allocated any one of the charging guns, thereby achieving more flexible power distribution.

[0058] Alternatively, the output ends of some high-voltage relays 203 are connected in parallel to multiple low-voltage relays, while some high-voltage relays are only connected to one low-voltage relay. That is, some charging module groups 201 are individually connected to multiple or all charging guns through a high-voltage relay 203 and multiple low-voltage relays 204. Therefore, only this part of the charging module group 201 can be randomly assigned to any of the charging guns. The other part of the charging module group 201 is only connected to a specific charging gun through a high-voltage relay 203 and a low-voltage relay 204, and the charging module group only provides power for the charging gun. This ensures that multiple charging needs can be charged at the same time, avoiding the allocation of most of the charging module groups to charging needs with relatively large charging needs, resulting in most of the charging guns not having charging module groups to provide power.

[0059] By controlling the opening and closing of the high-voltage relay 203 and the low-voltage relay 204, the charging module group 201 can be controlled accordingly to provide power to a specific charging gun, thereby realizing the distribution of power. That is, any charging module group 201 can be allocated to provide power to a charging gun, thereby realizing flexible power distribution. Moreover, by changing the number of allocated charging module groups 201, the power output of the charging gun can be changed without stopping charging, thereby meeting the charging needs of charging users in real time.

[0060] In the prior art, there is a method of using high-voltage relays alone to distribute power, but high-voltage relays are expensive and large in size, and have poor flexibility. If all high-voltage relays are used to implement this solution and distribute charging module groups, it is difficult to set multiple high-voltage relays in the same device due to the large size of the high-voltage relays and the size limitation. The number of charging module groups that can be installed will also be reduced accordingly, and it will be impossible to realize that the charging gun can call the charging power of the charging module at will. Therefore, using high-voltage relays alone will have the problem of poor flexibility in power distribution.

[0061] If only low-voltage relays are used for power distribution, although low-voltage relays are low-cost, small in size, and have high distribution flexibility, the voltage output by the charging module group is high voltage, and direct control with low-voltage relays will have certain safety hazards, such as improper operation, abnormal control, or interference with the equipment, which may cause damage to the equipment and even cause certain dangers.

[0062] Therefore, the charging device provided by the embodiment of the present invention adopts a combination of high-voltage relays and low-voltage relays to achieve the distribution of charging power. First, the high voltage output by the charging module group is directly controlled by a high-voltage relay, avoiding the unsafe problem of directly controlling the high voltage through a low-voltage relay. Then, by utilizing the small size and good flexibility of the low-voltage relay, multiple low-voltage relays are connected to the output end of each high-voltage relay, and then connected to all charging guns through the low-voltage relay, so that each charging gun can call the charging power of the charging module at will, realizing flexible power distribution and avoiding the unsafe problem of directly controlling the high voltage through a low-voltage relay.

[0063] Optionally, in order to ensure that there is no voltage difference between the contacts when the low-voltage relay 204 is in action, the operating reliability and safety of the equipment are improved. When the charging module group 201 is assigned to the charging gun to provide power, the corresponding charging module group 201 is started first. When the output voltage of the charging module group 201 and the voltage difference of the battery of the charging demander are within the allowable range, the corresponding low-voltage relay 204 is closed, and finally the high-voltage relay 203 is closed. When it is necessary to disconnect the charging module group 201 from the charging gun, the corresponding charging module group 201 is turned off first, then the high-voltage relay 203 is disconnected, and finally the low-voltage relay 204 is disconnected.

[0064] Optionally, in another embodiment of the present invention, each charging module group 201 can only be connected to one charging gun through the high-voltage relay 203 and the low-voltage relay 204 at any time to provide power for one charging gun.

[0065] It should be noted that the charging power required by each charging demander is different, and the probability of the charging guns charging at the same time is relatively small. If a larger output power is configured for the charging module group 201, although the charging needs of multiple charging demanders can be met at the same time, and one charging module group 201 can also meet the larger charging power demand. However, when only a few charging guns are charging and the charging demand is relatively small. The power required for charging is less than the output power configured by the charging module group 201, resulting in a waste of power. The charging module group 201 is configured with a relatively small output power. Although the output power of a charging module group 201 may only be able to meet the lower charging demand of a charging demander, it will not cause a waste of power, and each charging gun can meet the minimum charging demand. And when a charging module group 201 cannot meet the charging demand, multiple charging module groups 201 jointly provide electrical energy to meet the charging demand, avoid insufficient output power, and cause the problem of too long charging time. Moreover, the power output by adding multiple smaller output powers is closer to the power required for charging, and will not cause the output power to be too large or too small.

[0066] Based on the charging device provided in the above embodiment, another embodiment of the present invention provides a charging system, such as Figure 3 As shown, including:

[0067] A plurality of charging module groups 301 , a power distribution device 302 , a charging gun 303 and a charging control device 304 .

[0068] The output ends of the multiple charging module groups 301 are respectively connected to the power distribution device 302. The power distribution device 302 includes a high-voltage relay 305 connected to the charging module group 301 and a low-voltage relay 306 connected to the output end of the high-voltage relay, and one high-voltage relay 305 is connected to one charging module group 301.

[0069] The charging gun 303 is connected to the output end of the low voltage relay. The charging control device 304 is connected to the power distribution device 302 .

[0070] Each charging module group 301 includes at least one charging module, which is used to convert alternating current into direct current to provide power for the charging gun 303 .

[0071] The charging gun 303 is used to connect with a charging demander to charge the charging demander.

[0072] The charging control device 304 is used to obtain the charging demand of the charging demander, and control the opening and closing of the high-voltage relay 305 and the low-voltage relay 306 to distribute the charging module group 301 to the charging gun 303 for charging the charging demander to provide power according to the charging demand.

[0073] When a charging demander connects a charging gun 303 and uses the charging system for charging, the charging control device 304 obtains the charging demand of the charging demander, and then allocates the charging gun 303 for charging the charging demander to the charging module group 301 to provide electric energy according to the charging demand to meet the charging demand. The specific process of allocating the charging module group is to connect the charging module group 301 in an idle state with the charging gun 303 for charging the charging demander, and the connected charging module group 301 provides electric energy for the charging demander to charge. That is, the high-voltage relay 305 connected to the charging module group in an idle state is closed, and the low-voltage relay 306 connected to the high-voltage relay 305 and the charging gun for charging is closed, so that the charging module group outputs electric energy to the charging gun.

[0074] The charging system provided in this embodiment is connected to the charging demander through the charging gun 403 to charge the charging demander; the charging control device 404 obtains the charging demand of the charging demander, and then the charging control device allocates the charging demand, closes the corresponding high-voltage relay 305 and the low-voltage relay 306, so as to connect the corresponding charging module group 401 with the charging gun 403 for charging. The connected charging module group 401 provides electric energy to the charging gun 403 for charging the charging demander. By allocating charging module groups according to the charging needs of different charging demanders and allocating appropriate charging power to the charging demander, instead of using independent charging piles to charge all charging demanders with fixed power, it avoids the situation where the output power is too large or too small compared to the charging demand, thereby avoiding the problem of power waste and long charging time. At the same time, the combination of high-voltage relays and low-voltage relays is used to realize the allocation of charging module groups, which not only ensures safety, but also makes the power allocation more flexible.

[0075] Optionally, in another embodiment of the present invention, see Figure 4 , the output end of a high-voltage relay 405 is connected in parallel to multiple low-voltage relays 406 , and one low-voltage relay 406 is connected to a charging gun 403 .

[0076] Optionally, in the embodiment of the present invention, each of the charging module groups 401 can only be connected to one charging gun 403 via the high-voltage relay 405 and the low-voltage relay 406 at any time to provide power to the one charging gun 403 .

[0077] The specific components of the charging system provided by the above-mentioned embodiments of the present invention, the connection relationship between the components and the working process of the charging system can be found in the corresponding contents of the embodiments of the charging device, which will not be described in detail here.

[0078] Correspondingly, another embodiment of the present invention further provides a charging method. The method is implemented by the charging device or charging system disclosed in the above embodiment. Figure 5 As shown, the method specifically includes:

[0079] S501: Obtain charging demand of a charging demander.

[0080] The charging requirement may include the charging requirement voltage, charging requirement current, charging time and current battery power of the charging demander.

[0081] It should be noted that the charging control device can exchange information with the charging demander to obtain the demand information of the charging demander.

[0082] The charging control device can also detect whether the charging gun is successfully connected to the charging demander through information interaction. When the charging control device detects that the charging demander is successfully connected to the charging gun, the charging control device obtains the charging demand of the charging demander.

[0083] Optionally, the charging control device may exchange information with the charging demander through wireless communication, and may obtain the charging demand through the front-end device of the charging demander.

[0084] S502: Calculate the charging power according to the charging demand and the usage of the charging module group.

[0085] The charging module group outputs electric energy to the charging demander through a high-voltage relay and a low-voltage relay.

[0086] It should be noted that the charging module group includes multiple charging modules, each of which includes at least one charging module. In addition, one charging module group may output electric energy to the charging demander alone, or multiple charging modules may output electric energy to the charging demander at the same time for charging.

[0087] It should also be noted that when the high-voltage relay and the low-voltage relay corresponding to the charging module group are closed, the charging module group can output electric energy to the charging demander; when the high-voltage relay and the low-voltage relay corresponding to the charging module group are disconnected, the charging module group stops outputting electric energy to the charging demander.

[0088] The usage of the charging module group may refer to whether the charging module group is in use or idle. By determining the number of charging module groups that are idle at the current moment, and then determining the number of charging module groups that provide power to the charging demander according to the charging demand, the output power of all the charging module groups determined to provide power to the charging demander is added, and the total output power obtained is the charging power. The calculated charging power is an output power that is consistent with the charging demand as much as possible, to avoid waste caused by excessive output power, and to avoid excessively small output power, resulting in a long charging time.

[0089] For example, the output power of each charging module group is 5 kilowatts. If the charging demand is 10 kilowatts, if there are 4 idle charging module groups at this time, then two charging module groups are determined to provide electricity to the charging demanders, and the calculated charging power is 10 kilowatts; if the charging demand is 21 kilowatts, then 4 charging module groups are determined to provide electricity to the charging demanders, and the corresponding calculated charging power is 20 kilowatts.

[0090] Optionally, the charging module group is configured with a relatively low power to improve the utilization rate of the charging module group. Therefore, each charging module group can only provide power to one charging demander at any time. When the output power of one charging module group cannot meet the charging demand, other charging module groups together provide power to the charging demander.

[0091] S503: Sort the multiple charging demanders by charging order to obtain charging priority levels.

[0092] Optionally, the multiple charging demanders are sorted to obtain the charging priority level, which can be sorted according to the charging demand. For example, the charging demand power is sorted, and the lower the charging demand power is, the higher the priority is, so that the most charging demanders can be charged at the same time; or the charging time is sorted, and the shorter the charging time is, the higher the charging priority is, so as to avoid wasting the time of the charging demanders as much as possible. It can also be sorted according to the order of plugging in the gun, the earlier the plugging order is, the higher the charging order is, that is, sorting is based on first come first served; or sorting is performed according to a preset charging strategy, such as sorting according to the preset strategy of sorting according to the level of the user, and the higher the user level is, the higher the ranking is.

[0093] It should be noted that, in the actual implementation process of this embodiment, step S503 is optionally executed when there are multiple charging demanders, that is, after the charging power is calculated, step S503 may not be executed, and step S504 may be directly executed to allocate the charging module group to the charging demanders to provide power for charging by controlling the opening and closing of the high-voltage relay and the low-voltage relay according to the charging power.

[0094] It should also be noted that the charging demand of each charging demander is different, and the usage of the charging module group is also changing, so the calculated charging power is also different. Therefore, at this time, step 502 is specifically: calculate the charging power corresponding to each charging demand respectively.

[0095] S504: According to the charging power, the high-voltage relay and the low-voltage relay are controlled to open and close, so as to allocate the charging module group to the charging demander to provide electric energy for charging.

[0096] It should be noted that when step S503 is selected and then step S504 is executed, step S504 controls the opening and closing of the high-voltage relay and the low-voltage relay according to the charging power to allocate the charging module group to the charging demander to provide power for charging. Specifically:

[0097] According to the charging priority level, the charging power corresponding to each charging demand is controlled in turn by opening and closing the high-voltage relay and the voltage relay to allocate the charging module group to the multiple charging demanders to provide electric energy for charging.

[0098] The charging module group is allocated to provide electric energy to the charging demander according to the calculated charging power, and the charging demander is charged with the calculated charging power.

[0099] Optionally, in another embodiment of the present invention, in order to ensure that there is no voltage difference between contacts when the low-voltage relay is closed, thereby improving the safety of the method, a specific implementation of step S504 includes:

[0100] The assigned charging module group is first started, and it is determined whether the voltage difference between the output voltage of the charging module group and the charging requirement is within a preset range.

[0101] If it is determined that the voltage difference between the output voltage of the charging module group and the charging demand is within a preset range, the low-voltage relay corresponding to the charging module group is closed first, and then the high-voltage relay corresponding to the charging module group is closed to output electric energy for charging to the charging demander.

[0102] Similarly, in order to ensure that there is no voltage difference between the contacts when the charging module group stops outputting electric energy and disconnects the low-voltage relay, another embodiment of the present invention may further include:

[0103] When the charging demander needs to stop outputting electric energy to the charging demander, the corresponding charging module group is first shut down, then the high-voltage relay corresponding to the charging module group is disconnected, and finally the low-voltage relay corresponding to the charging module group is disconnected to stop outputting electric energy to the charging demander.

[0104] The present invention is capable of being implemented or used by those skilled in the art. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging device, characterized in that: include: Multiple charging module groups, used to convert AC power into DC power to provide DC power for the charging gun; wherein each charging module group includes at least one charging module; A power distribution device connected to the output ends of the plurality of charging module groups, for allocating the charging module groups to the charging guns according to the charging demands of the charging demanders acquired by the charging control device, thereby providing electric energy to the charging demanders; Wherein, the power distribution device comprises: A high-voltage relay connected to the charging module group; one of the high-voltage relays is connected to one of the charging module groups; A low voltage relay connected to the output end of the high voltage relay and the charging gun respectively.

2. The charging device according to claim 1, characterized in that: The output end of one high-voltage relay is connected in parallel to a plurality of low-voltage relays, and one low-voltage relay is connected to one charging gun.

3. The charging device according to claim 2, characterized in that: Each of the charging module groups can only be connected to one of the charging guns through the high-voltage relay and the low-voltage relay at any time to provide power to the charging gun.

4. A charging system, characterized in that: include: A plurality of charging module groups, used for converting AC power into DC power; wherein each charging module group includes at least one charging module; A power distribution device connected to the output ends of the plurality of charging module groups; wherein the power distribution device comprises a high-voltage relay connected to the charging module group and a low-voltage relay connected to the output end of the high-voltage relay, and one high-voltage relay is connected to one charging module group; A charging gun connected to the output end of the low-voltage relay is used to connect to a charging demander to charge the charging demander; The charging control device connected to the power distribution device is used to obtain the charging demand of the charging demander, and distribute the charging module group to provide power to the charging gun used by the charging demander by controlling the opening and closing of the high-voltage relay and the low-voltage relay according to the charging demand.

5. The system according to claim 4, characterized in that The output end of one high-voltage relay is connected in parallel to a plurality of low-voltage relays, and one low-voltage relay is connected to one charging gun.

6. The system according to claim 5, characterized in that Each of the charging module groups can only be connected to one of the charging guns through the high-voltage relay and the low-voltage relay at any time to provide power to the charging gun.

7. A charging method, characterized in that: include: Obtain charging needs of charging demanders; The charging power is calculated according to the charging demand and the usage of the charging module group; wherein the charging module group outputs electric energy to the charging demander through a high-voltage relay and a low-voltage relay; According to the charging power, the high-voltage relay and the low-voltage relay are controlled to open and close, so as to allocate the charging module group to the charging demander to provide electric energy for charging.

8. The method according to claim 7, characterized in that The method of controlling the opening and closing of the high-voltage relay and the low-voltage relay according to the charging power to allocate the charging module group to the charging demander to provide electric energy for charging includes: Starting the assigned charging module group, and determining whether the voltage difference between the output voltage of the charging module group and the voltage at the output end of the low-voltage relay is within a preset range; If it is determined that the voltage difference between the output voltage of the charging module group and the voltage at the output end of the low-voltage relay is within a preset range, the low-voltage relay corresponding to the charging module group is closed first, and then the high-voltage relay corresponding to the charging module group is closed to output electric energy for charging to the charging demander.

9. The method according to claim 8, characterized in that Also includes: When the charging module group needs to stop outputting electric energy to the charging demander, the corresponding charging module group is first shut down, then the high-voltage relay corresponding to the charging module group is disconnected, and finally the low-voltage relay corresponding to the charging module group is disconnected to stop outputting electric energy to the charging demander.

10. The method according to claim 7, characterized in that There are multiple charging demanders, and after the charging power is calculated, the method further includes: Sorting the multiple charging demanders into charging order to obtain charging priority levels; Wherein, allocating the charging module group to provide electric energy to the charging demander according to the charging power includes: According to the charging priority level, the charging module group is allocated to the multiple charging demanders to provide electric energy for charging by controlling the opening and closing of the high-voltage relay and the voltage relay according to the charging power corresponding to each charging demand.

Images