A battery management system used in energy storage system

Abstract

The present invention discloses a battery management system applied to an energy storage system, wherein a monitoring module is communicatively connected with a brake control module, the monitoring module is connected with a battery module, a number of single batteries are arranged in the battery module, and a temperature control module is communicatively connected with the brake control module; the monitoring module is used to monitor the parameters of each single battery in the battery module; the balancing circuit module is arranged in a single battery; the monitoring module sends a control signal to the brake control module according to the parameters of the single battery, and the brake control module is used to control the balancing circuit module to perform balancing processing on the single battery; the monitoring module sends a control signal to the brake control module according to the temperature of the battery module, and the brake control module controls the temperature control module to adjust the temperature of the battery module. This scheme determines whether the balancing circuit used by the balancing circuit module meets the replacement condition according to the battery parameters, so that the balancing circuit module maintains the best balancing scheme and also realizes intelligent temperature control.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery energy storage management, and in particular relates to a battery management system applied to an energy storage system. Background Art

[0002] The battery management system (BMS) is a core component in modern battery technology. Its main task is to ensure the safe and efficient operation of the battery pack. By integrating data acquisition, processing, analysis and control functions, the BMS can monitor the key parameters of the battery such as voltage, current, temperature, etc. in real time, and adjust the working state of the battery according to these parameters, thereby extending the battery life and improving the efficiency and safety of the battery.

[0003] In the prior art, a battery management system in an energy storage system usually configures a balancing circuit for each battery. The balancing circuit is mainly used to balance the voltage of each battery cell to ensure that all battery cells remain consistent during charging and discharging. The balancing circuit is mainly divided into two modes: passive balancing and active balancing. Passive balancing is also called energy dissipation balancing. Its working principle is to connect a resistor in parallel to each battery cell. When a battery cell is fully charged in advance and other batteries need to be charged, the resistor releases the power in the form of heat to the battery cell with high voltage, so as to gain more charging time for other batteries. The passive balancing circuit has a simple structure, low cost and is easy to implement. However, passive balancing can only reduce the voltage difference between batteries, and cannot fundamentally solve the problem of inconsistency between battery capacity and SOC (remaining capacity). Active balancing is also called non-energy dissipation balancing. Its principle is to transfer the energy in the battery cell with high energy to the battery cell with low energy during the charging and discharging cycle, so that the charge in the battery pack is redistributed, thereby shortening the charging time and extending the discharge time. However, active balancing requires an external energy source, which increases cost and volume, and due to inconsistent voltages within the battery pack, it is easy to cause imbalance in the battery pack.

[0004] Therefore, the present invention provides a battery management system applied to an energy storage system to solve the problems raised by the above background technology. Summary of the invention

[0005] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a battery management system applied to an energy storage system, which can improve the balancing ability of the balancing circuit in the battery management system and the temperature control ability of the battery module.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A battery management system used in an energy storage system, the battery management system comprising a balancing circuit module, a monitoring module, a brake control module, a battery module and a temperature control module, the monitoring module is connected to the brake control module in communication, the monitoring module is connected to the battery module, a number of single batteries are arranged in the battery module, and the temperature control module is connected to the brake control module in communication;

[0008] The monitoring module is used to monitor the parameters of each individual battery in the battery module;

[0009] The balancing circuit module is arranged in a single battery;

[0010] The monitoring module sends a control signal to the brake control module according to the parameters of the single battery, and the brake control module is used to control the balancing circuit module to perform balancing processing on the single battery;

[0011] The monitoring module sends a control signal to the brake control module according to the temperature of the battery module, and the brake control module controls the temperature control module to adjust the temperature of the battery module.

[0012] In practical applications of this embodiment, the parameters of the single battery include current, voltage and temperature data of the battery.

[0013] In practical applications of this embodiment, the temperature control module includes a plurality of temperature sensors, and the plurality of temperature sensors are arranged on the battery module and on the surface of a single battery cell.

[0014] In the practical application of this embodiment, the temperature control strategy of the temperature control module includes: a heating strategy and a cooling strategy;

[0015] The heating strategy is: when the monitoring module detects that the battery module is below 0°C, the braking control module controls the temperature control module to start the heating strategy to increase the battery temperature through the heating element set in the battery module;

[0016] The cooling strategy is: when the monitoring module detects that the battery module is higher than 25°C, the braking control module controls the temperature control module to start the cooling strategy, and the battery temperature is reduced through the cooling pipes set between the individual batteries of the battery module, and the cooling pipes are connected to the temperature control module.

[0017] In the actual application of this embodiment, the heating element is a heating wire, which is arranged on the external shell or internal structure of the battery module. The heating wire is communicated with the monitoring module and the braking control module respectively, and the monitoring module is used to monitor the temperature and heating effect of the heating wire in real time.

[0018] In the actual application of this embodiment, the heating element is a heat pipe, the heat pipe adopts a thermal balance design, the heat pipe is arranged inside the battery module, the heat pipe is communicated with the monitoring module and the brake control module respectively, and the monitoring module is used to monitor the temperature and heating effect of the heat pipe in real time.

[0019] In practical applications of this embodiment, a radiator is further included. A cooling medium is provided in the cooling pipe. The cooling pipe is connected to the radiator. The radiator is used to dissipate heat in the cooling medium of the cooling pipe to the external environment.

[0020] In the actual application of this embodiment, the braking control module determines whether the balancing circuit of the balancing circuit module is in a normal working state based on the parameters of a single battery. If the balancing circuit is in an abnormal state, a warning message is generated based on the parameters of the balancing circuit. The warning message is sent to a computer terminal, and the computer terminal is used to prompt the balancing circuit used by the balancing circuit module to be updated or replaced.

[0021] In practical applications of this embodiment, the warning information includes parameters of the equalizing circuit currently used by the equalizing circuit module and parameters of the equalizing circuit recommended for replacement, and the equalizing circuit recommended for replacement is used to replace the equalizing circuit currently used.

[0022] In the practical application of this embodiment, the recommended replacement condition includes: when the balancing circuit used by the balancing circuit module cannot balance the voltage difference in the battery, resulting in the voltage difference between the single batteries exceeding the set threshold, the replacement condition is met;

[0023] If the balancing circuit of the current balancing circuit module is short-circuited or overheated, and the temperature of a single battery exceeds the set threshold, the replacement condition is met;

[0024] The monitoring module determines whether the balancing circuit of the balancing circuit module meets the replacement condition according to the parameters of the single battery. If the monitoring module determines that it does, the replacement condition is met.

[0025] Beneficial effects of the present invention:

[0026] 1. The present invention provides a battery management system for use in an energy storage system. A monitoring module is provided, and the monitoring module is connected to a braking control module. The monitoring module monitors the parameters of each individual battery in a battery module. The braking control module controls the balancing circuit module to perform balancing on the individual battery. The braking control module also controls the temperature control module to adjust the temperature of the battery module. The monitoring module determines whether the balancing circuit used by the balancing circuit module meets the replacement condition according to the parameters of the individual battery, so that the balancing circuit module maintains the best balancing solution. This method can effectively solve the inconsistency problem between individual batteries, thereby extending the service life of the battery.

[0027] 2. When the monitoring module detects that the battery module is below 0℃ or above 25℃, it activates the heating strategy or cooling strategy respectively to achieve intelligent temperature control, ensuring that the battery pack can maintain a suitable operating temperature in any environment, thereby improving the battery life and safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0029] Figure 1 A system module diagram of an embodiment of a battery management system applied to an energy storage system of the present invention.

[0030] The main component symbols are explained as follows: balancing circuit module 101 , monitoring module 102 , braking control module 103 , battery module 104 , and temperature control module 105 . DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings 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 the field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their 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 at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] like Figure 1As shown, a battery management system of the present invention is applied to an energy storage system, the battery management system includes a balancing circuit module 101, a monitoring module 102, a braking control module 103, a battery module 104 and a temperature control module 105, the monitoring module 102 is connected to the braking control module 103 in communication, the monitoring module 102 is connected to the battery module 104, a number of single batteries are arranged in the battery module 104, and the temperature control module 105 is connected to the braking control module 103 in communication;

[0035] The monitoring module 102 is used to monitor the parameters of each individual battery in the battery module 104;

[0036] The balancing circuit module 101 is disposed in a single battery;

[0037] The monitoring module 102 sends a control signal to the brake control module 103 according to the parameters of the single battery, and the brake control module 103 is used to control the balancing circuit module 101 to perform balancing processing on the single battery;

[0038] The monitoring module 102 sends a control signal to the brake control module 103 according to the temperature of the battery module 104 , and the brake control module 103 controls the temperature control module 105 to adjust the temperature of the battery module 104 .

[0039] In practical applications of this embodiment, the parameters of the single battery include current, voltage and temperature data of the battery.

[0040] In the actual application of this embodiment, the temperature control module 105 includes a plurality of temperature sensors, and the plurality of temperature sensors are arranged on the battery module 104 and on the surface of a single battery cell.

[0041] In a low temperature environment, the chemical reaction speed inside the battery will slow down, resulting in a decrease in battery performance. In order to cope with this situation, the battery management system (BMS) of this embodiment will start a heating strategy. In the actual application of this embodiment, the temperature control strategy of the temperature control module 105 includes: a heating strategy and a cooling strategy;

[0042] The heating strategy is: when the monitoring module 102 detects that the battery module 104 is lower than 0°C, the braking control module 103 controls the temperature control module 105 to start the heating strategy, and the battery temperature is increased by the heating element provided in the battery module 104;

[0043] The cooling strategy is: when the monitoring module 102 detects that the battery module 104 is higher than 25°C, the braking control module 103 controls the temperature control module 105 to start the cooling strategy, and reduces the battery temperature through the cooling pipes set between the individual batteries of the battery module 104, and the cooling pipes are connected to the temperature control module 105.

[0044] In the actual application of this embodiment, the heating element is a heating wire, which is arranged on the external shell or internal structure of the battery module 104. The installation scheme includes welding, pasting or embedding. During the installation process, it is necessary to ensure that a certain safety distance is maintained between the heating wire and the individual batteries to prevent damage to the batteries due to overheating.

[0045] Specifically, the heating wire is communicated with the monitoring module 102 and the brake control module 103 respectively. The monitoring module 102 is used to monitor the temperature and heating effect of the heating wire in real time, and adjust the heating power and heating time as needed to ensure that the battery is always within a suitable operating temperature range.

[0046] Specifically, the heating wire of this embodiment is made of a metal material with high resistivity, high melting point and high stability, such as nickel-chromium alloy or iron-chromium-aluminum alloy, which can generate sufficient heat when powered and have good corrosion resistance and oxidation resistance.

[0047] Specifically, the heating wire is encapsulated in an insulating layer provided inside or outside the battery module 104 during installation to form a heating film or heating sheet. These heating films or heating sheets are flexibly installed inside or outside the battery module 104 to achieve uniform heating of the battery module 104.

[0048] In the actual application of this embodiment, the heating element is a heat pipe, which adopts a thermal balance design. The heat pipe is arranged inside the battery module 104, and the heat pipe is respectively communicated with the monitoring module 102 and the brake control module 103. The monitoring module 102 is used to monitor the temperature and heating effect of the heat pipe in real time to ensure that the battery is always within a suitable operating temperature range.

[0049] Specifically, the heat pipe of this embodiment includes a tube shell and a working medium, the tube shell is filled with a working medium, and the working medium is ammonia, water or alcohol. The working medium absorbs heat and evaporates in the evaporation section of the heat pipe, and then releases heat and condenses in the condensation section, thereby completing the heat transfer process. The heat pipe can be flexibly installed inside or outside the battery module 104. It should be noted that during the installation process, it is necessary to ensure that the evaporation section and condensation section of the heat pipe maintain good thermal contact with the battery cell to improve the heat transfer efficiency. At the same time, it is also necessary to pay attention to the sealing and stability of the heat pipe to prevent leakage of the working medium or failure of the heat pipe.

[0050] In practical applications of this embodiment, a radiator is further included. A cooling medium is provided in the cooling pipe. The cooling pipe is connected to the radiator. The radiator is used to dissipate heat in the cooling medium of the cooling pipe to the external environment.

[0051] Specifically, the cooling medium is a mixture of water and ethylene glycol, which has the characteristics of high thermal conductivity, low viscosity, low corrosiveness and low toxicity. During installation, the cooling pipe is set between individual batteries. It should be noted that the cooling pipe is set around the battery module 104 to ensure that the cooling medium can flow evenly through the battery module 104 to achieve effective heat transfer.

[0052] In the actual application of this embodiment, the braking control module 103 determines whether the balancing circuit of the balancing circuit module 101 is in a normal working state according to the parameters of a single battery. If the balancing circuit is in an abnormal state, a warning message is generated based on the parameters of the balancing circuit. The warning message is sent to a computer terminal, and the computer terminal is used to prompt the balancing circuit used by the balancing circuit module 101 to be updated or replaced.

[0053] In the actual application of this embodiment, the warning information includes parameters of the equalizing circuit currently used by the equalizing circuit module 101 and parameters of the equalizing circuit recommended for replacement, and the equalizing circuit recommended for replacement is used to replace the equalizing circuit currently used.

[0054] In the practical application of this embodiment, the recommended replacement condition includes: when the balancing circuit used by the balancing circuit module 101 cannot balance the voltage difference in the battery, resulting in the voltage difference between the single batteries exceeding the set threshold, the replacement condition is met;

[0055] If the current balancing circuit of the balancing circuit module 101 is short-circuited or overheated, the temperature of a single battery exceeds a set threshold value, and the replacement condition is met;

[0056] The monitoring module 102 determines whether the balancing circuit of the balancing circuit module 101 meets the replacement condition according to the parameters of the single battery. If the monitoring module 102 determines that it does, the replacement condition is met.

[0057] In summary, the present solution sets the monitoring module 102 to determine whether the balancing circuit used by the balancing circuit module 101 meets the replacement condition according to the parameters of the individual batteries, so that the balancing circuit module 101 maintains the best balancing solution. This method can effectively solve the inconsistency problem between individual batteries, thereby extending the service life of the battery.

[0058] When the monitoring module 102 detects that the battery module 104 is below 0°C or above 25°C, it activates a heating strategy or a cooling strategy respectively to achieve intelligent temperature control, ensuring that the battery pack can maintain a suitable operating temperature in any environment, thereby improving the battery life and safety performance.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A battery management system used in an energy storage system, characterized in that: The battery management system comprises a balancing circuit module (101), a monitoring module (102), a braking control module (103), a battery module (104) and a temperature control module (105); the monitoring module (102) is connected to the braking control module (103) in communication; the monitoring module (102) is connected to the battery module (104); a plurality of single batteries are arranged in the battery module (104); and the temperature control module (105) is connected to the braking control module (103) in communication; The monitoring module (102) is used to monitor the parameters of each individual battery in the battery module (104); The balancing circuit module (101) is arranged in a single battery; The monitoring module (102) sends a control signal to the braking control module (103) according to the parameters of the single battery, and the braking control module (103) is used to control the balancing circuit module (101) to perform balancing processing on the single battery; The monitoring module (102) sends a control signal to the brake control module (103) according to the temperature of the battery module (104), and the brake control module (103) controls the temperature control module (105) to adjust the temperature of the battery module (104).

2. A battery management system used in an energy storage system according to claim 1, characterized in that: The parameters of the single battery include current, voltage and temperature data of the battery.

3. A battery management system used in an energy storage system according to claim 1, characterized in that: The temperature control module (105) comprises a plurality of temperature sensors, and the plurality of temperature sensors are arranged on the battery module (104) and on the surface of a single battery cell.

4. A battery management system for use in an energy storage system according to claim 3, characterized in that: The temperature control strategy of the temperature control module (105) includes: a heating strategy and a cooling strategy; The heating strategy is as follows: when the monitoring module (102) detects that the temperature of the battery module (104) is lower than 0° C., the braking control module (103) controls the temperature control module (105) to start the heating strategy, thereby increasing the battery temperature through a heating element provided in the battery module (104); The cooling strategy is as follows: when the monitoring module (102) detects that the temperature of the battery module (104) is higher than 25° C., the braking control module (103) controls the temperature control module (105) to start the cooling strategy, and the battery temperature is reduced by cooling pipes arranged between individual batteries of the battery module (104), and the cooling pipes are connected to the temperature control module (105).

5. A battery management system used in an energy storage system according to claim 4, characterized in that: The heating element is a heating wire, which is arranged on the external shell or internal structure of the battery module (104). The heating wire is respectively connected to the monitoring module (102) and the brake control module (103) for communication, and the monitoring module (102) is used to monitor the temperature and heating effect of the heating wire in real time.

6. A battery management system used in an energy storage system according to claim 4, characterized in that: The heating element is a heat pipe, the heat pipe adopts a heat balance design, the heat pipe is arranged inside the battery module (104), the heat pipe is respectively connected to the monitoring module (102) and the brake control module (103), and the monitoring module (102) is used to monitor the temperature and heating effect of the heat pipe in real time.

7. A battery management system for use in an energy storage system according to claim 4, characterized in that: It also includes a radiator, a cooling medium is arranged in the cooling pipeline, the cooling pipeline is connected to the radiator, and the radiator is used to dissipate the heat in the cooling medium of the cooling pipeline to the external environment.

8. The battery management system used in an energy storage system according to claim 1, characterized in that: The brake control module (103) determines whether the balancing circuit of the balancing circuit module (101) is in a normal working state according to the parameters of the single battery, and generates a warning message based on the parameters of the balancing circuit if the balancing circuit is in an abnormal state. The warning message is sent to a computer terminal, and the computer terminal is used to prompt the balancing circuit used by the balancing circuit module (101) to be updated or replaced.

9. A battery management system for use in an energy storage system according to claim 1, characterized in that: The warning information includes parameters of the equalizing circuit currently used by the equalizing circuit module (101) and parameters of a recommended replacement equalizing circuit, wherein the recommended replacement equalizing circuit is used to replace the currently used equalizing circuit.

10. A battery management system used in an energy storage system according to claim 1, characterized in that: The recommended replacement condition includes: when the balancing circuit used by the balancing circuit module (101) cannot balance the voltage difference in the battery, resulting in the voltage difference between the single batteries exceeding a set threshold, the replacement condition is met; If the balancing circuit of the current balancing circuit module (101) is short-circuited or overheated, and the temperature of a single battery exceeds a set threshold, a replacement condition is met; The monitoring module (102) determines whether the balancing circuit of the balancing circuit module (101) meets the replacement condition according to the parameters of the single battery. If the monitoring module (102) determines that it does, the replacement condition is met.

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