Battery management method of direct-current high-voltage constant-power energy storage device

Abstract

The invention provides a battery management method of a direct-current high-voltage constant-power energy storage device, which is applied to a direct-current high-voltage household energy storage box and comprises the following steps: S1, area delimitation: dividing an area space in a box body into a converter acquisition area, a high-voltage box acquisition area, a battery pack acquisition area and an area outside the box, each delimited area is sequentially delimited into a surface layer area, a deep layer area and a core area in the direction far away from the cabin door; s2, working information in each delimited area is acquired and uploaded to a master control module; s3, the master control module sends corresponding working signals to a management system and a temperature control system according to the collected working information, and meanwhile, the master control module uploads the collected working information to a cloud data processing center; and S4, the cloud data processing center analyzes and processes the working information, and sends an adjustment signal to the master control module according to a preset condition, or sends an alarm signal to an information receiving equipment terminal of a worker according to the preset condition.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage household energy storage boxes, and in particular to a battery management method for a direct current high-voltage constant-power energy storage device. Background Art

[0002] With the development of science and technology, AI calculations are widely used in various industries. AI calculations require a large amount of electricity. In order to meet the power demand, it is usually necessary to use a high-power storage box for power supply. At the same time, for construction sites or high-rise buildings, it is usually necessary to use a high-power storage box for power supply.

[0003] The energy storage box that is used for power supply is usually located in the power distribution room, and a separate air conditioner needs to be installed in the power distribution room to cool the environment. However, the battery box inside the high-power energy storage box usually generates a lot of heat when working, so a complex cooling and heat dissipation system is usually installed inside the energy storage box to ensure the service life of the battery box and reduce the safety hazards caused by battery overheating.

[0004] However, the current cooling and heat dissipation system usually cools the entire interior of the box, but does not specifically control the temperature of the battery box in operation or regulate the working state. Therefore, there is an urgent need for a method to manage the batteries in the energy storage box to improve the efficiency of the temperature control system and the power supply of the battery box. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a battery management method for a DC high voltage constant power energy storage device, which is implemented as follows:

[0006] A battery management method for a DC high-voltage constant-power energy storage device is applied to a DC high-voltage household energy storage box, wherein the DC high-voltage household energy storage box comprises a box body, a plurality of battery boxes are stored in the lower space of the box body, a DC-DC converter and a high-voltage box are stored in the upper space of the box body, the DC high-voltage household energy storage box further comprises a master control module, a temperature control system, and a management system, an openable and closable door is arranged on the box body, an industrial air conditioner is arranged on the door, and a plurality of air ducts corresponding to the battery boxes are arranged at the cold air outlet of the industrial air conditioner, comprising the following steps:

[0007] S1. Area demarcation: the area space in the box is divided into a converter collection area, a high-voltage box collection area, a battery pack collection area, and an area outside the box according to the projection areas of the DC-DC converter, the high-voltage box, and the battery boxes on the vertical plane and the box body. Each of the demarcated areas is demarcated in sequence as a surface area, a deep area, and a core area in the direction away from the hatch;

[0008] S2. Collect and obtain the working information in each designated area and upload it to the master control module, wherein the working information includes power consumption information, temperature information and power information;

[0009] S3. The master control module sends corresponding working signals to the management system and the temperature control system according to the collected working information, and the master control module uploads the collected working information to the cloud data processing center;

[0010] S4. The cloud data processing center analyzes and processes the work information, and sends an adjustment signal to the master control module according to preset conditions, or sends an alarm signal to the information receiving device terminal of the staff according to preset conditions.

[0011] As a further improvement, the management system includes a battery management system and an in-cabin energy management system, the battery management system includes a battery management system master control built into the high-voltage box, the battery management system master control is communicatively connected to a battery management system slave control built into the battery box, and the in-cabin energy management system is communicatively connected to each of the battery boxes, the DC-DC converter, the high-voltage box and the industrial air conditioner respectively;

[0012] Among them, the battery management system obtains power consumption information in real time, and the in-cabin energy management system obtains power information and temperature information in real time.

[0013] As a further improvement, the electricity usage information includes:

[0014] Module power usage information, including power usage information of the master control module, temperature control system and management system, wherein the module power usage information is constant power usage information;

[0015] Terminal power consumption information, including industrial air conditioner power consumption information;

[0016] External power consumption information, the external power consumption information includes full power consumption information and mains-storage power coordinated power consumption information.

[0017] As a further improvement, the power information includes:

[0018] Backup battery power information, wherein the backup battery is arranged in the box, and the backup battery is used to provide power to the master control module and the management system in the event of a power outage and when the battery boxes in the box have no stored power;

[0019] Battery pack power information, the battery pack power information includes the remaining power of each battery box.

[0020] As a further improvement, the rated storage capacity of each battery box is defined as E0, and the current storage capacity of each battery box is defined as E1. Then:

[0021] When E1≥90%E0, the battery box is defined as fully charged;

[0022] When 20%E0≤E1<90%E0, the battery box is defined as being in a normal power state;

[0023] When 5%E0≤E1<20%E0, the battery box is defined as being in a low power state;

[0024] When E1<5%E0, the battery box is defined as empty;

[0025] The master control module selects and deploys corresponding battery boxes for power supply according to the battery pack power information.

[0026] As a further improvement, a first temperature sensor is provided on the outer wall surface of each battery box close to the hatch, a second temperature sensor is provided on the inner wall surface of the battery box close to the hatch, a deep temperature sensor and a core temperature sensor are sequentially provided inside the battery box in the direction away from the hatch, an in-box temperature sensor is provided on the inner wall of the hatch, and at least one out-of-box temperature sensor is provided on the outer wall of the box body.

[0027] As a further improvement, the battery boxes are numbered according to the row and column they are in. With the direction of the battery pack facing forward after the hatch is opened as the reference, the battery box at the bottom and leftmost is numbered as battery box 1-1, the battery box adjacent to the right of battery box 1-1 is numbered as battery box 1-2, the battery box adjacent to the top of battery box 1-1 is numbered as battery box 2-1, and so on, until the battery box at the top and rightmost is numbered as MN, where M and N are natural numbers not less than 2;

[0028] Correspondingly, the air ducts corresponding to the battery boxes are numbered up to the M'-N' air ducts, and the air outlets of the air ducts are provided with valve leaves which are opened and closed by motor control.

[0029] As a further improvement, S3 comprises the following steps:

[0030] S301. Obtain power consumption information and determine whether the current external power consumption information is that a single battery box can meet the power supply demand. If it is satisfied, proceed to step S302, otherwise proceed to step S303;

[0031] S302. When a single battery box can meet the power consumption of external power consumption information, filter the battery boxes in the current energy storage box that are in a fully charged state, and select any fully charged battery box to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes for power supply. If there are no other fully charged battery boxes, filter the battery boxes in the current energy storage box that are in a normally charged state, select one of the battery boxes in a normally charged state for switching power supply, and if there are no other fully charged battery boxes, enter step S303;

[0032] If there is no fully charged battery box in the current energy storage box, the battery boxes in the normal power state in the current energy storage box are screened, and any battery box in the normal power state is selected to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switches to other battery boxes in the normal power state for power supply, if there is no battery box in the normal power state, proceed to step S303;

[0033] S303. When a single battery box cannot meet the power consumption of external power consumption information, select the battery boxes in the current energy storage box that are in a fully charged state or a normally charged state, and select at least two of the battery boxes for parallel discharge until any battery box enters a low power state, or any of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes or normally charged battery boxes to join the power supply;

[0034] When entering this step from step S302, a power shortage signal is sent to the cloud data processing center to notify the staff to replace the battery box. At the same time, at least two battery boxes in low power state are selected for parallel discharge until any battery box enters an empty power state, or any core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding the preset temperature threshold, and then other battery boxes that are not in an empty power state are switched to join the power supply.

[0035] As a further improvement, before switching the battery box to power supply in S302, the battery box to be powered is connected in parallel to the circuit, and then the circuit of the battery box to be shut down is disconnected to form a constant voltage switch;

[0036] Define the battery box to be shut down as xy, and all other optional battery boxes to be powered that meet the conditions as ki;

[0037] Among them, k=1, 2...M, i=1, 2...N, x=1, 2...M, y=1, 2...N;

[0038] Define the priority value as P, according to the formula Calculate the priority of the optional battery boxes with power supply that meet the conditions, where the larger the P value, the higher the priority. If the P values ​​are the same, the one with the largest i value is selected as the battery box to be powered;

[0039] When only two battery boxes are needed for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected for discharge. When any one of the two battery boxes does not meet the discharge demand and needs to be switched to other battery boxes, the two battery boxes are used as the base points to determine the priority values ​​of other battery boxes that meet the conditions and record them as P1 and P2 respectively, and the one with the smallest |P1-P2| is selected as the battery box that is switched to power supply with priority;

[0040] When more than two battery boxes are required for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected as the battery box for cooperating in discharge and recorded as the second base point. Subsequently, the priority values ​​of other battery boxes that meet the conditions are calculated based on the base point and recorded as P1'. The priority values ​​of other battery boxes that meet the conditions are calculated based on the second base point and recorded as P2'. The one with the smallest value of |P1′-P2′| is selected as the battery box for cooperating in discharge and recorded as the third base point. If there are multiple battery boxes that meet the requirements for selecting the third base point, the one with the largest P1' or P2' value is selected as the battery box for cooperating in discharge and recorded, and so on until the required number of battery boxes meets the demand.

[0041] As a further improvement, a plurality of valve leaves are provided at the air outlet of each of the air ducts, and the valve leaves can be turned over to open and close, and the opening and closing states of the valve leaves include a fully closed state, a half-open state, and a fully open state;

[0042] When the MNth battery box is in working state, the master control module sends a full-open signal to the M'-N'th air duct, and the valve leaf of the M'-N'th air duct is in full-open state;

[0043] The first temperature sensor is provided with a first temperature threshold and a second temperature threshold. When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the first temperature threshold, the master control module sends a half-open signal to the valve blades of other air ducts adjacent to the M'-N'th air duct, and the valve blades of the air ducts receiving the half-open signal are switched from a fully closed state to a half-open state. If the same air duct receives at least two half-open signals at the same time, or the same air duct receives a half-open signal and a fully open signal at the same time, the valve blades of the air duct are switched to or remain in a fully open state;

[0044] When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the second temperature threshold, the temperature information t1 collected by the deep temperature sensor and the temperature information t2 collected by the core temperature sensor are compared, and the temperature threshold preset in the deep temperature sensor is defined as T1, and the temperature threshold preset in the core temperature sensor is defined as T2. When t1≥80%T1 or t2≥70%T2, the MNth battery box stops supplying power and is supplied by other battery boxes that meet the conditions. At the same time, the M'-N' air duct is switched to a half-open state and ventilation is maintained for at least 3 to 5 minutes.

[0045] The beneficial effects of the present invention are:

[0046] 1. Divide the energy storage box into different areas, number the battery boxes in different areas, and monitor the temperature in different areas. This can effectively and timely reflect whether the energy storage box is overheated or overloaded, and can provide timely feedback to the staff and realize maintenance more accurately.

[0047] 2. According to the collected temperature information, power information and power consumption information, the corresponding battery box in the energy storage box can be accurately selected for energy supply, reducing energy waste, while reasonably allocating the energy reserve of the battery box and increasing the service life of the battery box. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0049] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0050] The present invention provides a battery management method for a DC high-voltage constant-power energy storage device, which is implemented as follows:

[0051] A battery management method for a DC high-voltage constant-power energy storage device is applied to a DC high-voltage household energy storage box, wherein the DC high-voltage household energy storage box comprises a box body, a plurality of battery boxes are stored in the lower space of the box body, a DC-DC converter and a high-voltage box are stored in the upper space of the box body, the DC high-voltage household energy storage box further comprises a master control module, a temperature control system, and a management system, an openable and closable door is arranged on the box body, an industrial air conditioner is arranged on the door, and a plurality of air ducts corresponding to the battery boxes are arranged at the cold air outlet of the industrial air conditioner, comprising the following steps:

[0052] S1. Area demarcation: the area space in the box is divided into a converter collection area, a high-voltage box collection area, a battery pack collection area, and an area outside the box according to the projection areas of the DC-DC converter, the high-voltage box, and the battery boxes on the vertical plane and the box body. Each of the demarcated areas is demarcated in sequence as a surface area, a deep area, and a core area in the direction away from the hatch;

[0053] S2. Collect and obtain the working information in each designated area and upload it to the master control module, wherein the working information includes power consumption information, temperature information and power information;

[0054] S3. The master control module sends corresponding working signals to the management system and the temperature control system according to the collected working information, and the master control module uploads the collected working information to the cloud data processing center;

[0055] S4. The cloud data processing center analyzes and processes the work information, and sends an adjustment signal to the master control module according to preset conditions, or sends an alarm signal to the information receiving device terminal of the staff according to preset conditions.

[0056] As a further improvement, the management system includes a battery management system and an in-cabin energy management system, the battery management system includes a battery management system master control built into the high-voltage box, the battery management system master control is communicatively connected to a battery management system slave control built into the battery box, and the in-cabin energy management system is communicatively connected to each of the battery boxes, the DC-DC converter, the high-voltage box and the industrial air conditioner respectively;

[0057] Among them, the battery management system obtains power consumption information in real time, and the in-cabin energy management system obtains power information and temperature information in real time.

[0058] As a further improvement, the electricity usage information includes:

[0059] Module power usage information, including power usage information of the master control module, temperature control system and management system, wherein the module power usage information is constant power usage information;

[0060] Terminal power consumption information, including industrial air conditioner power consumption information;

[0061] External power consumption information, the external power consumption information includes full power consumption information and mains-storage power coordinated power consumption information.

[0062] As a further improvement, the power information includes:

[0063] Backup battery power information, wherein the backup battery is arranged in the box, and the backup battery is used to provide power to the master control module and the management system in the event of a power outage and when the battery boxes in the box have no stored power;

[0064] Battery pack power information, the battery pack power information includes the remaining power of each battery box.

[0065] As a further improvement, the rated storage capacity of each battery box is defined as E0, and the current storage capacity of each battery box is defined as E1. Then:

[0066] When E1≥90%E0, the battery box is defined as fully charged;

[0067] When 20%E0≤E1<90%E0, the battery box is defined as being in a normal power state;

[0068] When 5%E0≤E1<20%E0, the battery box is defined as being in a low power state;

[0069] When E1<5%E0, the battery box is defined as empty;

[0070] The master control module selects and deploys corresponding battery boxes for power supply according to the battery pack power information.

[0071] As a further improvement, a first temperature sensor is provided on the outer wall surface of each battery box close to the hatch, a second temperature sensor is provided on the inner wall surface of the battery box close to the hatch, a deep temperature sensor and a core temperature sensor are sequentially provided inside the battery box in the direction away from the hatch, an in-box temperature sensor is provided on the inner wall of the hatch, and at least one out-of-box temperature sensor is provided on the outer wall of the box body.

[0072] As a further improvement, the battery boxes are numbered according to the row and column they are in. With the direction of the battery pack facing forward after the hatch is opened as the reference, the battery box at the bottom and leftmost is numbered as battery box 1-1, the battery box adjacent to the right of battery box 1-1 is numbered as battery box 1-2, the battery box adjacent to the top of battery box 1-1 is numbered as battery box 2-1, and so on, until the battery box at the top and rightmost is numbered as MN, where M and N are natural numbers not less than 2;

[0073] Correspondingly, the air ducts corresponding to the battery boxes are numbered up to the M'-N' air ducts, and the air outlets of the air ducts are provided with valve leaves which are opened and closed by motor control.

[0074] As a further improvement, S3 comprises the following steps:

[0075] S301. Obtain power consumption information and determine whether the current external power consumption information is that a single battery box can meet the power supply demand. If it is satisfied, proceed to step S302, otherwise proceed to step S303;

[0076] S302. When a single battery box can meet the power consumption of external power consumption information, filter the battery boxes in the current energy storage box that are in a fully charged state, and select any fully charged battery box to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes for power supply. If there are no other fully charged battery boxes, filter the battery boxes in the current energy storage box that are in a normally charged state, select one of the battery boxes in a normally charged state for switching power supply, and if there are no other fully charged battery boxes, enter step S303;

[0077] If there is no fully charged battery box in the current energy storage box, the battery boxes in the normal power state in the current energy storage box are screened, and any battery box in the normal power state is selected to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switches to other battery boxes in the normal power state for power supply, if there is no battery box in the normal power state, proceed to step S303;

[0078] S303. When a single battery box cannot meet the power consumption of external power consumption information, select the battery boxes in the current energy storage box that are in a fully charged state or a normally charged state, and select at least two of the battery boxes for parallel discharge until any battery box enters a low power state, or any of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes or normally charged battery boxes to join the power supply;

[0079] When entering this step from step S302, a power shortage signal is sent to the cloud data processing center to notify the staff to replace the battery box. At the same time, at least two battery boxes in low power state are selected for parallel discharge until any battery box enters an empty power state, or any core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding the preset temperature threshold, and then other battery boxes that are not in an empty power state are switched to join the power supply.

[0080] As a further improvement, before switching the battery box to power supply in S302, the battery box to be powered is connected in parallel to the circuit, and then the circuit of the battery box to be shut down is disconnected to form a constant voltage switch;

[0081] Define the battery box to be shut down as xy, and all other optional battery boxes to be powered that meet the conditions as ki;

[0082] Among them, k=1, 2...M, i=1, 2...N, x=1, 2...M, y=1, 2...N;

[0083] Define the priority value as P, according to the formula Calculate the priority of the optional battery boxes with power supply that meet the conditions, where the larger the P value, the higher the priority. If the P values ​​are the same, the one with the largest i value is selected as the battery box to be powered;

[0084] When only two battery boxes are needed for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected for discharge. When any one of the two battery boxes does not meet the discharge demand and needs to be switched to other battery boxes, the two battery boxes are used as the base points to determine the priority values ​​of other battery boxes that meet the conditions and record them as P1 and P2 respectively, and the one with the smallest |P1-P2| is selected as the battery box that is switched to power supply with priority;

[0085] When more than two battery boxes are required for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected as the battery box for cooperating in discharge and recorded as the second base point. Subsequently, the priority values ​​of other battery boxes that meet the conditions are calculated based on the base point and recorded as P1'. The priority values ​​of other battery boxes that meet the conditions are calculated based on the second base point and recorded as P2'. The one with the smallest value of |P1′-P2′| is selected as the battery box for cooperating in discharge and recorded as the third base point. If there are multiple battery boxes that meet the requirements for selecting the third base point, the one with the largest P1' or P2' value is selected as the battery box for cooperating in discharge and recorded, and so on until the required number of battery boxes meets the demand.

[0086] As a further improvement, a plurality of valve leaves are provided at the air outlet of each of the air ducts, and the valve leaves can be turned over to open and close, and the opening and closing states of the valve leaves include a fully closed state, a half-open state, and a fully open state;

[0087] When the MNth battery box is in working state, the master control module sends a full-open signal to the M'-N'th air duct, and the valve leaf of the M'-N'th air duct is in full-open state;

[0088] The first temperature sensor is provided with a first temperature threshold and a second temperature threshold. When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the first temperature threshold, the master control module sends a half-open signal to the valve blades of other air ducts adjacent to the M'-N'th air duct, and the valve blades of the air ducts receiving the half-open signal are switched from a fully closed state to a half-open state. If the same air duct receives at least two half-open signals at the same time, or the same air duct receives a half-open signal and a fully open signal at the same time, the valve blades of the air duct are switched to or remain in a fully open state;

[0089] When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the second temperature threshold, the temperature information t1 collected by the deep temperature sensor and the temperature information t2 collected by the core temperature sensor are compared, and the temperature threshold preset in the deep temperature sensor is defined as T1, and the temperature threshold preset in the core temperature sensor is defined as T2. When t1≥80%T1 or t2≥70%T2, the MNth battery box stops supplying power and is supplied by other battery boxes that meet the conditions. At the same time, the M'-N' air duct is switched to a half-open state and ventilation is maintained for at least 3 to 5 minutes.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery management method for a DC high-voltage constant-power energy storage device, applied to a DC high-voltage household energy storage box, wherein the DC high-voltage household energy storage box comprises a box body, a plurality of battery boxes are stored in the lower space of the box body, a DC-DC converter and a high-voltage box are stored in the upper space of the box body, the DC high-voltage household energy storage box further comprises a master control module, a temperature control system, and a management system, an openable and closable door is provided on the box body, an industrial air conditioner is provided on the door, and a plurality of air ducts corresponding to the battery boxes are provided at the cold air outlet position of the industrial air conditioner, characterized in that: The following steps are involved: S1. Area demarcation: the area space in the box is divided into a converter collection area, a high-voltage box collection area, a battery pack collection area, and an area outside the box according to the projection areas of the DC-DC converter, the high-voltage box, and the battery boxes on the vertical plane and the box body. Each of the demarcated areas is demarcated in sequence as a surface area, a deep area, and a core area in the direction away from the hatch; S2. Collect and obtain the working information in each designated area and upload it to the master control module, wherein the working information includes power consumption information, temperature information and power information; S3. The master control module sends corresponding working signals to the management system and the temperature control system according to the collected working information, and the master control module uploads the collected working information to the cloud data processing center; S4. The cloud data processing center analyzes and processes the work information, and sends an adjustment signal to the master control module according to preset conditions, or sends an alarm signal to the information receiving device terminal of the staff according to preset conditions.

2. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 1, characterized in that: The management system includes a battery management system and an in-cabin energy management system. The battery management system includes a battery management system master control built into the high-voltage box. The battery management system master control is communicatively connected to a battery management system slave control built into the battery box. The in-cabin energy management system is communicatively connected to each of the battery boxes, the DC-DC converter, the high-voltage box, and the industrial air conditioner, respectively. Among them, the battery management system obtains power consumption information in real time, and the in-cabin energy management system obtains power information and temperature information in real time.

3. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 2, characterized in that: The electricity usage information includes: Module power usage information, including power usage information of the master control module, temperature control system and management system, wherein the module power usage information is constant power usage information; Terminal power consumption information, including industrial air conditioner power consumption information; External power consumption information, the external power consumption information includes full power consumption information and mains-storage power coordinated power consumption information.

4. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 2, characterized in that: The power information includes: Backup battery power information, wherein the backup battery is arranged in the box, and the backup battery is used to provide power to the master control module and the management system in the event of a power outage and when the battery boxes in the box have no stored power; Battery pack power information, the battery pack power information includes the remaining power of each battery box.

5. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 4, characterized in that: Define the rated storage capacity of each battery box as E0, and the current storage capacity of each battery box as E1: When E1≥90%E0, the battery box is defined as fully charged; When 20%E0≤E1<90%E0, the battery box is defined as being in a normal power state; When 5%E0≤E1<20%E0, the battery box is defined as being in a low power state; When E1<5%E0, the battery box is defined as empty; The master control module selects and deploys corresponding battery boxes for power supply according to the battery pack power information.

6. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 5, characterized in that: A first temperature sensor is arranged on the outer wall surface of each battery box near the hatch, a second temperature sensor is arranged on the inner wall surface of the battery box near the hatch, a deep temperature sensor and a core temperature sensor are arranged in sequence inside the battery box in the direction away from the hatch, an in-box temperature sensor is arranged on the inner wall of the hatch, and at least one out-of-box temperature sensor is arranged on the outer wall of the box body.

7. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 6, characterized in that: The battery boxes are numbered according to the row and column they are in. With the direction of the battery pack facing forward after the hatch is opened as the reference, the battery box at the bottom and leftmost is numbered as battery box 1-1, the battery box adjacent to the right of battery box 1-1 is numbered as battery box 1-2, the battery box adjacent to the top of battery box 1-1 is numbered as battery box 2-1, and so on, until the battery box at the top and rightmost is numbered as MN, where M and N are natural numbers not less than 2; Correspondingly, the air ducts corresponding to the battery boxes are numbered up to the M'-N' air ducts, and the air outlets of the air ducts are provided with valve leaves which are opened and closed by motor control.

8. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 7, characterized in that: The S3 comprises the following steps: S301. Obtain power consumption information and determine whether the current external power consumption information is that a single battery box can meet the power supply demand. If it is satisfied, proceed to step S302, otherwise proceed to step S303; S302. When a single battery box can meet the power consumption of external power consumption information, filter the battery boxes in the current energy storage box that are in a fully charged state, and select any fully charged battery box to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes for power supply. If there are no other fully charged battery boxes, filter the battery boxes in the current energy storage box that are in a normally charged state, select one of the battery boxes in a normally charged state for switching power supply, and if there are no other fully charged battery boxes, enter step S303; If there is no fully charged battery box in the current energy storage box, the battery boxes in the normal power state in the current energy storage box are screened, and any battery box in the normal power state is selected to supply power until the battery box enters a low power state, or any one of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switches to other battery boxes in the normal power state for power supply, if there is no battery box in the normal power state, proceed to step S303; S303. When a single battery box cannot meet the power consumption of external power consumption information, select the battery boxes in the current energy storage box that are in a fully charged state or a normally charged state, and select at least two of the battery boxes for parallel discharge until any battery box enters a low power state, or any of the core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding a preset temperature threshold, and then switch to other fully charged battery boxes or normally charged battery boxes to join the power supply; When entering this step from step S302, a power shortage signal is sent to the cloud data processing center to notify the staff to replace the battery box. At the same time, at least two battery boxes in low power state are selected for parallel discharge until any battery box enters an empty power state, or any core temperature sensor or deep temperature sensor on the battery box detects temperature information exceeding the preset temperature threshold, and then other battery boxes that are not in an empty power state are switched to join the power supply.

9. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 8, characterized in that: Before switching the battery box to power supply in S302, the battery box to be powered is connected in parallel to the circuit, and then the circuit of the battery box to be shut down is disconnected to form a constant voltage switch; Define the battery box to be shut down as xy, and all other optional battery boxes to be powered that meet the conditions as ki; Among them, k=1, 2...M, i=1, 2...N, x=1, 2...M, y=1, 2...N; Define the priority value as P, according to the formula Calculate the priority of the optional battery boxes with power supply that meet the conditions, where the larger the P value, the higher the priority. If the P values ​​are the same, the one with the largest i value is selected as the battery box to be powered; When only two battery boxes are needed for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected for discharge. When any one of the two battery boxes does not meet the discharge demand and needs to be switched to other battery boxes, the two battery boxes are used as the base points to determine the priority values ​​of other battery boxes that meet the conditions and record them as P1 and P2 respectively, and the one with the smallest |P1-P2| is selected as the battery box that is switched to power supply with priority; When more than two battery boxes are required for combined power supply in S303, the battery box with the highest current power storage capacity is used as the base point to calculate the priority values ​​of other battery boxes that meet the conditions, and the one with the highest P value is selected as the battery box for cooperating in discharge and recorded as the second base point. Subsequently, the priority values ​​of other battery boxes that meet the conditions are calculated based on the base point and recorded as P1'. The priority values ​​of other battery boxes that meet the conditions are calculated based on the second base point and recorded as P2'. The one with the smallest value of |P1′-P2′| is selected as the battery box for cooperating in discharge and recorded as the third base point. If there are multiple battery boxes that meet the requirements for selecting the third base point, the one with the largest P1' or P2' value is selected as the battery box for cooperating in discharge and recorded, and so on until the required number of battery boxes meets the demand.

10. A battery management method for a DC high voltage constant power energy storage device as claimed in claim 8, characterized in that: A plurality of valve leaves are arranged at the air outlet of each air duct, and the valve leaves can be turned over to open and close, and the opening and closing states of the valve leaves include a fully closed state, a half-open state and a fully open state; When the MNth battery box is in working state, the master control module sends a full-open signal to the M'-N'th air duct, and the valve leaf of the M'-N'th air duct is in full-open state; The first temperature sensor is provided with a first temperature threshold and a second temperature threshold. When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the first temperature threshold, the master control module sends a half-open signal to the valve blades of other air ducts adjacent to the M'-N'th air duct, and the valve blades of the air ducts receiving the half-open signal are switched from a fully closed state to a half-open state. If the same air duct receives at least two half-open signals at the same time, or the same air duct receives a half-open signal and a fully open signal at the same time, the valve blades of the air duct are switched to or remain in a fully open state; When the temperature information detected by the first temperature sensor of the MNth battery box exceeds the second temperature threshold, the temperature information t1 collected by the deep temperature sensor and the temperature information t2 collected by the core temperature sensor are compared, and the temperature threshold preset in the deep temperature sensor is defined as T1, and the temperature threshold preset in the core temperature sensor is defined as T2. When t1≥80%T1 or t2≥70%T2, the MNth battery box stops supplying power and is supplied by other battery boxes that meet the conditions. At the same time, the M'-N' air duct is switched to a half-open state and ventilation is maintained for at least 3 to 5 minutes.

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