Power supply control method based on energy storage type charging pile cooling system

Abstract

The invention discloses a power supply control method based on an energy storage type charging pile cooling system, belongs to the technical field of energy storage type charging piles, realizes power supply to a TMS (Transistor Management System) through whole pile cold start, can effectively utilize a wire net to supply power in a low-temperature environment, ensures normal operation of the TMS in a charging pile start-up stage, prevents an energy storage battery from over-discharging at a low temperature, and improves the charging efficiency. The service life of the energy storage battery is prolonged; according to the method, the TMS is powered by whole pile hot start, it is ensured that under different working conditions, when the charging pile is restarted, the TMS can rapidly obtain appropriate power supply, and the working efficiency of the charging pile is improved; the AC / DC is used for supplying power to the TMS, so that external power grid resources are fully utilized, the power supply requirement of the TMS is met, the dependence on an energy storage battery is reduced, and the energy utilization efficiency is optimized; full-automatic power supply line switching is achieved, the TMS power supply mode is automatically adjusted according to various factors such as the environment temperature and the SOC of the energy storage battery, manual intervention is not needed, and the stability and reliability of operation of the charging pile are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage type charging piles, and in particular to a power supply control method based on a cooling system of an energy storage type charging pile. Background Art

[0002] With the popularization of new energy vehicles, energy storage charging piles are being used more and more widely. During the operation of the energy storage charging pile, the thermal management system (TMS, Thermal Management System) is crucial to maintaining the stable operation of the various components of the charging pile. At present, most of the existing technologies are concentrated on the power supply and control of TMS in new energy vehicles, and there are few related studies in the field of energy storage charging piles. In addition, the existing technology lacks research on the power supply mode switching logic of the thermal management system, which makes it difficult to meet the demand for TMS power supply of energy storage charging piles under different environmental conditions. For example, when the ambient temperature changes, it is impossible to flexibly and efficiently select a suitable power supply mode for the TMS, which affects the overall performance of the charging pile and the service life of the energy storage battery. Summary of the invention

[0003] The object of the present invention is to provide a power supply control method based on a cooling system of an energy storage charging pile to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a power supply control method based on an energy storage charging pile cooling system, characterized in that it includes the following steps:

[0005] After the whole pile is powered on, the EMS performs self-test on all relays. After the self-test is completed, it checks whether the K1 / K2~K17 / K18 relays are completely disconnected. If there are relays that are not disconnected, the EMS controls them to be forcibly disconnected;

[0006] Detect the external ambient temperature and control the power supply according to different ambient temperatures:

[0007] When the ambient temperature is lower than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a loop, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0008] When the ambient temperature is lower than T2 and higher than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0009] When the ambient temperature is lower than T3 and higher than T2, control relays K1 / K2 and K3 / K4 to close, and determine the SOC of PackA and PackB. If the SOC of PackB is higher than that of PackA, control relays K13 / K14 to close, and K11 / K12 to disconnect. If it is determined that the external network is connected and the energy storage battery has a request for energy replenishment, control K5 / K6 and K7 / K8 to close.

[0010] When the ambient temperature is lower than T4 and higher than T3, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0011] When the ambient temperature is higher than T4, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If so, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a circuit, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, K1 / K2 and K3 / K4 are controlled to be attracted, so that the battery pack participates in the power supply to TMS.

[0012] Preferably, there are four TMS working modes, namely, cooling mode, heating mode, self-circulation mode, and preparation mode. The EMS controls the TMS to enter the actual control mode according to actual needs.

[0013] Preferably, all components and relay K in the system are controlled by the EMS via the CAN bus.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention realizes cold start of the whole pile to supply power to the TMS. In a low temperature environment, the line network power supply can be effectively utilized to ensure the normal operation of the TMS in the startup phase of the charging pile, avoid excessive discharge of the energy storage battery at low temperature, and extend the service life of the energy storage battery; the whole pile is hot started to supply power to the TMS, ensuring that under different working conditions, the TMS can quickly obtain appropriate power supply when the charging pile is restarted, thereby improving the working efficiency of the charging pile; AC / DC is used to supply power to the TMS, and external power grid resources are fully utilized to reduce the dependence on the energy storage battery while meeting the power supply demand of the TMS, thereby optimizing the energy utilization efficiency; fully automatic power supply line switching is realized, and the TMS power supply mode is automatically adjusted according to multiple factors such as ambient temperature and the SOC of the energy storage battery, without manual intervention, thereby improving the stability and reliability of the operation of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of a power supply structure of a power supply control method for a cooling system of an energy storage charging pile according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1 , an embodiment of the present invention provides a power supply control method based on an energy storage charging pile cooling system, comprising the following steps:

[0019] After the whole pile is powered on, the EMS performs self-test on all relays. After the self-test is completed, it checks whether the K1 / K2~K17 / K18 relays are completely disconnected. If there are relays that are not disconnected, the EMS controls them to be disconnected forcibly.

[0020] Detect the external ambient temperature and control the power supply according to different ambient temperatures:

[0021] When the ambient temperature is lower than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a loop, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0022] When the ambient temperature is lower than T2 and higher than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0023] When the ambient temperature is lower than T3 and higher than T2, control relays K1 / K2 and K3 / K4 to close, and determine the SOC of PackA and PackB. If the SOC of PackB is higher than that of PackA, control relays K13 / K14 to close, and K11 / K12 to disconnect. If it is determined that the external network is connected and the energy storage battery has a request for energy replenishment, control K5 / K6 and K7 / K8 to close.

[0024] When the ambient temperature is lower than T4 and higher than T3, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS.

[0025] When the ambient temperature is higher than T4, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If so, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a circuit, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, K1 / K2 and K3 / K4 are controlled to be attracted, so that the battery pack participates in the power supply to TMS.

[0026] There are four TMS working modes, namely cooling mode, heating mode, self-circulation mode, and standby mode. EMS controls TMS to enter the actual control mode according to actual needs.

[0027] Among them, all components and relay K in the system are controlled by EMS through CAN bus.

[0028] After the entire pile is powered on, the EMS quickly performs self-check operations on all relays to ensure that the initial state of the relays is normal. If it is found that a relay is not disconnected, the EMS will immediately issue a command to forcibly control the relay to disconnect, laying the foundation for the safe and stable subsequent power supply control process.

[0029] When the external ambient temperature is in different ranges, according to the actual working needs of the charging pile, such as charging speed, battery heating, etc., EMS flexibly controls TMS to enter cooling, heating, self-circulation or preparation mode to ensure that the charging pile is always in the best working condition.

[0030] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power supply control method based on an energy storage charging pile cooling system, characterized in that: The following steps are involved: After the whole pile is powered on, the EMS performs self-test on all relays. After the self-test is completed, it checks whether the K1 / K2~K17 / K18 relays are completely disconnected. If there are relays that are not disconnected, the EMS controls them to be forcibly disconnected; Detect the external ambient temperature and control the power supply according to different ambient temperatures: When the ambient temperature is lower than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a loop, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS. When the ambient temperature is lower than T2 and higher than T1, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile rises to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS. When the ambient temperature is lower than T3 and higher than T2, control relays K1 / K2 and K3 / K4 to close, and determine the SOC of PackA and PackB. If the SOC of PackB is higher than that of PackA, control relays K13 / K14 to close, and K11 / K12 to disconnect. If it is determined that the external network is connected and the energy storage battery has a request for energy replenishment, control K5 / K6 and K7 / K8 to close. When the ambient temperature is lower than T4 and higher than T3, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If there is, choose to control relays K5 / K6, K11 / K12 to be attracted in sequence or control relays K5 / K6, K13 / K14 to be attracted in sequence to power TMS. After the relays are attracted to form a loop, the output power of AC / DC1 or AC / DC2 is controlled to be equal to the maximum available output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, control K1 / K2 and K3 / K4 to be attracted, so that the battery pack participates in the power supply to TMS. When the ambient temperature is higher than T4, it is forbidden to close K1 / K2 and K3 / K4, and detect whether there is high-voltage three-phase electricity at the front end of AC / DC1 and AC / DC2. If so, choose to control relays K5 / K6, K7 / K8, K9 / K10, K11 / K12 to be attracted in sequence or control relays K5 / K6, K7 / K8, K9 / K10, K13 / K14 to be attracted in sequence. One of these two lines supplies power to TMS. After the relays are attracted to form a circuit, the output power of AC / DC1 and AC / DC2 is controlled to be equal to the maximum output power of TMS to reach the target temperature. When the operating temperature of the charging pile drops to the operating temperature of the energy storage battery, K1 / K2 and K3 / K4 are controlled to be attracted, so that the battery pack participates in the power supply to TMS.

2. According to claim 1, a power supply control method based on a cooling system of an energy storage charging pile is characterized in that: There are four TMS working modes, namely cooling mode, heating mode, self-circulation mode, and standby mode. EMS controls TMS to enter the actual control mode according to actual needs.

3. According to claim 1, a power supply control method based on a cooling system of an energy storage charging pile is characterized in that: All components and relay K in the system are controlled by EMS via CAN bus.

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