BMS middle end safety protection circuit system and method

Abstract

According to the BMS middle end safety protection circuit system and method, firstly, the acting force of a lithium battery module on a cavity is obtained according to a pressure control module, the working state of a pressure release valve is adjusted through the pressure control module according to pressure information, and therefore the situation that a battery cell of a battery is damaged due to too large pressure is avoided; then, the temperature condition of the lithium battery is detected according to a temperature control module, and the states of a refrigerator and an air blower controlled by the temperature control module are adjusted in real time according to the temperature value of the lithium battery so as to ensure the working temperature of the lithium battery; and finally, the power supply power of the lithium battery is adjusted in real time through the output control module, and the output channel state of the lithium battery is cut off in an emergency state to protect an electric device. According to the BMS middle-end safety protection method, the stability of a power supply system and the operation and maintenance efficiency of a power supply product are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery control, and more specifically, to a BMS mid-end safety protection circuit system and method. Background Art

[0002] ‌BMS, the full name of which is BATTERY MANAGEMENT SYSTEM, is widely used in the field of power supply. Especially in UPS (uninterruptible power supply), it plays a vital role in the control of lithium battery modules. As a core IT equipment, UPS plays a vital role in ensuring the power supply security required for the normal operation of data centers. When the power grid encounters various faults, UPS outputs high-quality power through the configured battery through AC inversion to avoid data loss or task interruption caused by power outages.

[0003] The installation and operation of lithium batteries are called the BMS mid-end link. The traditional operation and maintenance means are on-site manual installation and maintenance, which has the defect of human operation. In order to improve the mid-end safety, BMS mid-end safety protection can be used to improve the stability of the entire battery system. There is an urgent need for a BMS mid-end safety protection technology that can improve the stability of the power system and improve the operation and maintenance efficiency of power products. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a BMS mid-end safety protection circuit system and method. First, the force exerted by the lithium battery module on the cavity is obtained according to the pressure control module, and the working state of the pressure relief valve is adjusted by the pressure control module according to the pressure information to avoid damage to the battery cell due to excessive pressure; then, the temperature of the lithium battery is detected according to the temperature control module, and the refrigerator and the blower state controlled by the temperature control module are adjusted in real time according to the temperature value of the lithium battery to ensure the working temperature of the lithium battery; finally, the power supply power of the lithium battery is adjusted in real time through the output control module, and the output channel state of the lithium battery is cut off in an emergency to protect the electrical devices; the present invention improves the stability of the power supply system and improves the operation and maintenance efficiency of the power supply products through the BMS mid-end safety protection method.

[0005] A first aspect of the present invention provides a BMS mid-end safety protection circuit system, the circuit system comprising: Pressure control module, temperature control module and output control module; The pressure control module includes a pressure sensor circuit for detecting the interaction force between the battery and the housing, and a pressure relief valve control circuit for controlling the pressure relief state of the pressure relief valve according to the set pressure relief parameters; The temperature control module includes a temperature detection circuit for detecting the temperature value of the lithium battery, and a heat dissipation control circuit for adjusting the cooling effect and air volume according to the heat dissipation parameters; The output control module includes a current limiting control circuit for controlling the power supply current and an output isolation circuit for switching the output conduction state of the lithium battery.

[0006] In this solution, the pressure control module is specifically: It includes a sensor circuit and a pressure relief valve control circuit; The pressure sensor circuit is a sensor circuit that converts the interaction force between the battery and the housing into an analog-to-digital conversion value; The pressure relief valve control circuit is a control circuit that adjusts the pressure relief state according to the PWM signal In this solution, the temperature control module is specifically: Including temperature detection circuit and heat dissipation control circuit; The temperature detection circuit is a temperature sensor or a thermistor circuit, which is used to detect the temperature value of the lithium battery; The heat dissipation control circuit is a driving circuit for controlling the cooling power of the refrigerator and the blowing air volume of the blower.

[0007] In this solution, the output control module is specifically: Output isolation circuit, and current limiting control circuit; The output isolation circuit controls the conduction relay through the bypass isolation circuit to switch the output conduction state of the lithium battery; The current limiting control circuit is used to adjust the power supply current of the lithium battery by adjusting the feedback resistance of the current limiting control circuit.

[0008] A second aspect of the present invention provides a BMS mid-end security protection method, the method comprising: obtaining first pressure information; Determining whether the first pressure information is greater than a preset first pressure threshold; If yes, controlling the working state of the pressure relief valve according to the first pressure information; Determining a first air volume upper limit threshold according to the working state of the pressure relief valve; Acquiring first temperature information; Determining whether the first temperature information exceeds a preset standard temperature value; If yes, obtaining first air volume information and first cooling information according to the first temperature information and the standard temperature value; Determining whether the first air volume information exceeds the first air volume upper limit threshold; If yes, adjusting the first air volume information according to the first air volume information and the first air volume upper limit threshold; The first cooling information is set according to the first air volume upper limit threshold.

[0009] In this solution, the working state of the pressure relief valve is controlled according to the first pressure information, specifically: According to a preset first time period, first pressure information is collected and recorded to obtain a first pressure sequence; determining first slope information according to the first pressure sequence; Obtaining pressure release parameter information according to the first slope information; The working state of the pressure relief valve is controlled according to the pressure relief parameter information.

[0010] In this solution, the first air volume upper limit threshold is determined according to the working state of the pressure relief valve, specifically: Obtaining first slope information; Determining whether the first slope information exceeds a preset first slope threshold; If so, the air volume threshold table selects the first air volume corresponding table; If not, the air volume threshold table selects the second air volume corresponding table; Get the decompression parameter information; A first air volume upper limit threshold is determined according to the pressure relief parameter information and the air volume threshold table.

[0011] In this solution, the first air volume information and the first cooling information are obtained according to the first temperature information and the standard temperature value, specifically: Collecting first temperature information according to a preset first time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a first proportional control amount, a first integral control amount, and a first differential control amount according to the first temperature deviation information and a set first control weight; Obtaining a first air volume control amount according to the first proportional control amount, the first integral control amount and the first differential control amount; The first air volume information is updated according to the first air volume control amount.

[0012] In this solution, the first air volume information and the first cooling information are obtained according to the first temperature information and the standard temperature value, specifically: Collecting first temperature information according to a preset second time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a second proportional control amount and a second integral control amount according to the first temperature deviation information and a set second control weight; Obtaining a first refrigeration control amount according to the second proportional control amount and the second integral control amount; The first refrigeration information is updated according to the first refrigeration control amount.

[0013] In this solution, adjusting the first cooling information according to the first air volume information and the first air volume upper limit threshold is specifically: Calculating a difference between the first air volume information and the first air volume upper limit threshold to obtain first air volume deviation information; determining a first cooling adjustment amount according to the first air volume deviation information; The first refrigeration information is adjusted according to the first refrigeration adjustment amount.

[0014] The object of the present invention is to provide a BMS mid-end safety protection circuit system and method. First, the force exerted by the lithium battery module on the cavity is obtained according to the pressure control module, and the working state of the pressure relief valve is adjusted by the pressure control module according to the pressure information to avoid the battery cell from being damaged due to excessive pressure; then, the temperature of the lithium battery is detected according to the temperature control module, and the refrigerator and the blower state controlled by the temperature control module are adjusted in real time according to the temperature value of the lithium battery to ensure the working temperature of the lithium battery; finally, the power supply power of the lithium battery is adjusted in real time through the output control module, and the output channel state of the lithium battery is cut off in an emergency to protect the electrical devices; the present invention improves the stability of the power supply system and improves the operation and maintenance efficiency of the power supply product through the BMS mid-end safety protection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0016] Figure 1 A block diagram of a BMS mid-end safety protection circuit system of the present invention is shown; Figure 2 A flow chart of a BMS mid-end safety protection method of the present invention is shown; Figure 3 A control flow chart of a pressure relief valve provided in an embodiment of the present invention is shown; Figure 4 A flow chart for determining a first air volume upper limit threshold value provided by an embodiment of the present invention is shown. 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] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0019] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0020] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0021] Figure 1 A block diagram of a BMS mid-end safety protection circuit system of the present invention is shown.

[0022] like Figure 1 As shown, the first aspect of the present invention discloses a BMS mid-end security protection method, the method comprising: A pressure control module 101, a temperature control module 102 and an output control module 103; The pressure control module 101 includes a pressure sensor circuit for detecting the interaction force between the battery and the housing, and a pressure relief valve control circuit for controlling the pressure relief state of the pressure relief valve according to the set pressure relief parameters; The temperature control module 102 includes a temperature detection circuit for detecting the temperature value of the lithium battery, and a heat dissipation control circuit for adjusting the cooling effect and air volume according to the heat dissipation parameters; The output control module 103 includes a current limiting control circuit for controlling the power supply current and an output isolation circuit for switching the output conduction state of the lithium battery.

[0023] It should be noted that, in this embodiment, a BMS mid-end safety protection circuit is formed by a pressure control module, a temperature control module and an output control module. The pressure control module is used to detect the pressure of the interaction force between the battery and the shell, wherein at least a pressure sensor equal to the number of lithium battery modules is included to measure the pressure of each lithium battery on the shell. The pressure control module controls the pressure relief valve control circuit of the pressure relief valve according to the set pressure relief parameters, which has the effect of reducing the pressure of the shell on the lithium battery. The temperature control module is used to detect the temperature value of the lithium battery, wherein at least a temperature detection element equal to the number of lithium battery modules is included to measure the real-time temperature value of each lithium battery. The temperature control module also adjusts the cooling condition of the refrigerator and the blowing air volume of the blower according to the heat dissipation parameters. The output control module is used to adjust the output current of the lithium battery, and to realize the function of disconnecting the output conduction state in an emergency.

[0024] According to an embodiment of the present invention, the pressure control module is specifically: It includes a sensor circuit and a pressure relief valve control circuit; The pressure sensor circuit is a sensor circuit that converts the interaction force between the battery and the housing into an analog-to-digital conversion value; The pressure relief valve control circuit is a control circuit that adjusts the pressure relief state according to a PWM signal.

[0025] It should be noted that in this embodiment, the pressure sensor outputs an analog quantity, which is amplified and filtered by the circuit, converted into a digital quantity by the analog-to-digital converter, and then processed by the CPU; wherein the size of the digital quantity is directly related to the size of the pressure value, and generally speaking, the larger the pressure value, the larger the digital quantity. The control input signal of the pressure relief valve control circuit is a PWM signal, wherein the higher the duty cycle of the PWM signal, the greater the opening of the pressure relief valve, that is, the more obvious the pressure relief effect.

[0026] According to an embodiment of the present invention, the temperature control module is specifically: Including temperature detection circuit and heat dissipation control circuit; The temperature detection circuit is a temperature sensor or a thermistor circuit, which is used to detect the temperature value of the lithium battery; The heat dissipation control circuit is a driving circuit for controlling the cooling power of the refrigerator and the blowing air volume of the blower.

[0027] It should be noted that the temperature detection circuit is a temperature sensor or a thermistor circuit. If it is a temperature sensor, such as DS18B20, the temperature value of the sensor can be obtained through a preset communication instruction; if it is a thermistor circuit, the temperature value of the thermistor is obtained by detecting the resistance value of the thermistor through a table lookup method. The heat dissipation control circuit is used to control the temperature value and running speed of the heat-conducting carrier in the heat dissipation system. In the air-cooling system, the heat dissipation control circuit controls the cooling power of the refrigerator to adjust the temperature value of the heat-conducting air; the heat dissipation control circuit controls the blowing air volume of the blower to adjust the running speed of the heat-conducting air.

[0028] According to an embodiment of the present invention, the output control module is specifically: Output isolation circuit, and current limiting control circuit; The output isolation circuit controls the conduction relay through the bypass isolation circuit to switch the output conduction state of the lithium battery; The current limiting control circuit is used to adjust the power supply current of the lithium battery by adjusting the feedback resistance of the current limiting control circuit.

[0029] It should be noted that the output isolation circuit controls the conduction of the lithium battery output by controlling the conduction relay through the bypass isolation circuit, which is used to disconnect the lithium battery from the electrical equipment in an emergency and improve the safety of lithium battery use. The current limiting control circuit adjusts the feedback resistance of the current limiting control circuit to adjust the supply current of the lithium battery, so as to adjust the output of each lithium battery module, that is, to adjust the heating of each lithium battery module, thereby improving the service life of the lithium battery.

[0030] It is worth mentioning that it also includes: Anti-reverse connection circuit and surge protection circuit; The anti-reverse connection circuit is a voltage detection conduction circuit used to prevent the positive and negative poles of the voltage from being reversed; The surge protection circuit is used to improve circuit stability by using an enhanced MOSFET charge pump.

[0031] It should be noted that the reverse connection protection circuit is used to detect the positive and negative poles of the voltage. When the positive and negative poles are connected, it is in the on state and the voltage is normally connected; when the positive and negative poles are connected in reverse, it is in the off state and the voltage cannot be connected. The surge protection circuit uses an enhanced MOSFET charge pump to improve the circuit's ability to withstand instantaneous high voltages such as static electricity and surges.

[0032] Figure 2 A flow chart of a BMS mid-end safety protection method of the present invention is shown.

[0033] like Figure 2 As shown, the second aspect of the present invention discloses a BMS mid-end security protection method, the method comprising: S202, obtaining first pressure information; S204, determining whether the first pressure information is greater than a preset first pressure threshold; S206, if yes, controlling the working state of the pressure relief valve according to the first pressure information; S208, determining a first air volume upper limit threshold according to the working state of the pressure relief valve; S210, obtaining first temperature information; S212, determining whether the first temperature information exceeds a preset standard temperature value; S214: If yes, obtain first air volume information and first cooling information according to the first temperature information and the standard temperature value; S216, determining whether the first air volume information exceeds the first air volume upper limit threshold; S218: If yes, adjusting the first air volume information according to the first air volume information and the first air volume upper limit threshold; S220: Set the first cooling information according to the first air volume upper limit threshold.

[0034] It should be noted that the first pressure information is the magnitude of the interaction force between the lithium battery and the shell; the first air volume upper limit threshold is the upper limit value of the air volume parameter of the blower; the first temperature information is the temperature value of the lithium battery; the first air volume information is the setting parameter for adjusting the blower blowing speed, that is, the blowing volume per unit time; the first refrigeration information is the setting parameter for adjusting the refrigeration working state of the refrigerator.

[0035] In this embodiment, first, the first pressure information is obtained through the pressure sensor. When the first pressure information exceeds the preset first pressure threshold, it means that the interaction force between the lithium battery and the shell is too high due to heat expansion, transportation vibration, etc., and it is necessary to release the pressure in time to avoid damage to the battery cell of the lithium battery, thereby extending the service life of the lithium battery. The working state of the pressure relief valve is controlled according to the first pressure information, that is, the interaction force between the shell and the lithium battery is reduced. Secondly, according to the working state of the pressure relief valve, the first air volume upper limit threshold is determined; when in the pressure release state, the heat dissipation channel will be opened, and the hot air in the heat dissipation channel is taken out of the shell; at this time, this embodiment adopts the method of controlling the air volume to avoid blowing too much hot air out of the shell, reducing the danger to users or operators near the power supply equipment. Then, the first temperature information of the lithium battery is obtained through the temperature detection circuit, and according to the relationship between the first temperature information and the standard temperature value, the first air volume information and the first cooling information are calculated according to the set heat dissipation adjustment strategy. Finally, it is determined whether the first air volume information exceeds the first air volume upper limit threshold; if not, the refrigerator and the blower are set according to the first air volume information and the first cooling information; if not, the first air volume information needs to be adjusted according to the first air volume upper limit threshold, and then the first cooling information is adjusted according to the adjusted first air volume information, and the refrigerator and the blower are set according to the adjusted first air volume information and the first cooling information. The heat dissipation control circuit is adaptively adjusted to ensure that the lithium battery works within a safe temperature, thereby increasing the service life of the lithium battery.

[0036] Figure 3 A control flow chart of a pressure relief valve provided in an embodiment of the present invention is shown.

[0037] According to an embodiment of the present invention, Figure 3 As shown, the working state of the pressure relief valve is controlled according to the first pressure information, specifically: S302, collecting and recording first pressure information according to a preset first time period to obtain a first pressure sequence; S304, determining first slope information according to the first pressure sequence; S306, obtaining pressure release parameter information according to the first slope information; S308: Control the working state of the pressure relief valve according to the pressure relief parameter information.

[0038] It should be noted that, in the present embodiment, the expansion trend of the lithium battery in the shell is analyzed according to the first pressure information to determine the pressure relief parameters of the pressure relief valve. In practical applications, if the opening of the pressure relief valve is too small, there is a problem of insufficient pressure relief effect; if the opening of the pressure relief valve is too large, there is a lack of limit support between the lithium battery and the shell, and there is a risk of displacement of the lithium battery. Therefore, in the present embodiment, the first pressure information is collected and recorded according to the preset first time period to obtain the first pressure sequence. Then, according to the first pressure sequence, a pressure change curve is obtained by curve fitting; then, according to the pressure change curve, the first slope information is obtained; wherein, the first slope information can represent the trend of pressure change, and the greater the slope, the faster the pressure rises. Finally, according to the first slope information, the preset pressure relief parameter corresponding table is searched to obtain the pressure relief parameter information, that is, the PWM duty cycle value, which is used to control the working state of the pressure relief valve.

[0039] Figure 4 A flow chart for determining a first air volume upper limit threshold value provided by an embodiment of the present invention is shown.

[0040] According to an embodiment of the present invention, Figure 4 As shown, the first air volume upper limit threshold is determined according to the working state of the pressure relief valve, specifically: S402, obtaining first slope information; S404, determining whether the first slope information exceeds a preset first slope threshold; S406: If yes, the air volume threshold table selects the first air volume corresponding table; S408, if not, the air volume threshold table selects the second air volume corresponding table; S410, obtaining pressure relief parameter information; S412: Determine a first air volume upper limit threshold value according to the pressure relief parameter information and the air volume threshold table.

[0041] It should be noted that, in this embodiment, the air volume threshold table is first selected according to the pressure change trend, and then the first air volume upper limit threshold is determined according to the pressure relief parameter information. First, the slope information of the pressure change curve is obtained; then, it is determined whether it exceeds the preset first slope threshold according to the first slope information; wherein, the first slope threshold is 0, that is, when the first slope is greater than 0, it means that the pressure value is still in an upward state, the internal pressure is relatively large and can abut against the opening of the pressure relief valve, and the heat-conducting air is not easy to flow out, and a larger blast air volume can be set, then the first air volume corresponding table is selected as the air volume threshold table; when the first slope information is less than 0, it means that the pressure value is in a downward state, the internal pressure is relatively small and difficult to abut against the opening of the pressure relief valve, and the heat-conducting air is easy to flow out, and a smaller blast air volume needs to be set, then the second air volume corresponding table is selected as the air volume threshold table. Finally, the air volume threshold table is searched according to the pressure relief parameter information to obtain the first air volume upper limit threshold.

[0042] According to an embodiment of the present invention, obtaining the first air volume information and the first cooling information according to the first temperature information and the standard temperature value is specifically: Collecting first temperature information according to a preset first time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a first proportional control amount, a first integral control amount, and a first differential control amount according to the first temperature deviation information and a set first control weight; Obtaining a first air volume control amount according to the first proportional control amount, the first integral control amount and the first differential control amount; The first air volume information is updated according to the first air volume control amount.

[0043] It should be noted that, as an implementation method, this embodiment adopts a feedback control strategy to adjust the first air volume information of the blower. First, according to the preset first time period, the difference between the first temperature information and the standard temperature value is calculated to obtain the first temperature deviation information. The first control weight includes a first proportional control weight, a first integral control weight and a first differential control weight. Then, according to the first temperature deviation value and the set first proportional control weight, the first proportional control amount is obtained; according to the integral value of the first temperature deviation value and the set first integral control weight, the first integral control amount is obtained; according to the differential value of the first temperature deviation value and the set first differential control weight, the first differential control amount is obtained. Finally, the sum of the first proportional control amount, the first integral control amount and the first differential control amount is calculated to obtain the first air volume control amount, which is used to update the first air volume information.

[0044] According to an embodiment of the present invention, obtaining the first air volume information and the first cooling information according to the first temperature information and the standard temperature value is specifically: Collecting first temperature information according to a preset second time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a second proportional control amount and a second integral control amount according to the first temperature deviation information and a set second control weight; Obtaining a first refrigeration control amount according to the second proportional control amount and the second integral control amount; The first refrigeration information is updated according to the first refrigeration control amount.

[0045] It should be noted that, as an implementation method, this embodiment adopts another feedback control strategy to adjust the first refrigeration information of the refrigerator. First, according to the preset second time period, the difference between the first temperature information and the standard temperature value is calculated to obtain the first temperature deviation information; wherein the second time period is slower than the first time period. The second control weight includes a second proportional control weight and a second integral control weight. Then, according to the first temperature deviation value and the set second proportional control weight, a second proportional control amount is obtained; according to the integral value of the first temperature deviation value and the set second integral control weight, a second integral control amount is obtained. Finally, the sum of the second proportional control amount and the second integral control amount is calculated to obtain the first refrigeration control amount, which is used to update the first refrigeration information.

[0046] According to an embodiment of the present invention, adjusting the first cooling information according to the first air volume information and the first air volume upper limit threshold is specifically: Calculating a difference between the first air volume information and the first air volume upper limit threshold to obtain first air volume deviation information; determining a first cooling adjustment amount according to the first air volume deviation information; The first refrigeration information is adjusted according to the first refrigeration adjustment amount.

[0047] It should be noted that when the first air volume information exceeds the first air volume upper limit threshold, and the first air volume information and the first refrigeration information need to be adjusted, firstly, the difference between the first air volume information and the first air volume upper limit threshold is used to obtain the first air volume deviation information, which is used to indicate the air volume value that needs to be reduced, and is used to indicate the air volume value that needs to be compensated by lowering the temperature of the heat transfer carrier. Then, the corresponding refrigeration adjustment table is searched to obtain the first refrigeration adjustment amount. Finally, according to the first refrigeration adjustment amount, the first refrigeration information is adjusted to achieve the effect of compensating the air volume by cooling.

[0048] It is worth mentioning that it also includes: Acquiring first temperature information; Determining whether the first temperature information exceeds a preset first temperature threshold; If so, the first control weight or the second control weight is adjusted according to the first temperature information.

[0049] It should be noted that, due to the hysteresis effect of heat transfer, this embodiment adjusts the efficiency and stability of temperature regulation by adjusting the control weight of the feedback control strategy. When the first temperature information exceeds the preset first temperature threshold, the control weight adjustment strategy can be executed, and the first control weight or the second control weight can be determined by looking up the table. When the temperature deviation value is large, a high proportional weight and a low integral weight are used to improve the efficiency of temperature regulation; when the temperature deviation value is small, a low proportional weight and a high integral weight are used to improve the stability of temperature change; thereby improving the efficiency and stability of temperature regulation.

[0050] It is worth mentioning that it also includes: obtaining first pressure information; Determining whether the first pressure information is greater than a preset second pressure threshold; If so, the output conduction state of the lithium battery is disconnected.

[0051] It should be noted that in this embodiment, when the first pressure information exceeds the preset second pressure threshold, it means that the battery is over-expanded or severely deformed due to external force, and there is a risk of burning or short circuit. At this time, the output conduction state of the lithium battery is disconnected through the output isolation circuit to reduce the danger of using the electrical equipment.

[0052] It is worth mentioning that it also includes: Acquiring first temperature information; Determining whether the first temperature information exceeds a preset second temperature threshold; If yes, adjusting the power supply current of the lithium battery according to the first temperature information; Determining whether the first temperature information exceeds a preset third temperature threshold; If so, the output conduction state of the lithium battery is disconnected.

[0053] It should be noted that, in this embodiment, when the first temperature information exceeds the preset second temperature threshold, it indicates that the lithium battery is in an output heating state, and the supply current of the lithium battery is adjusted according to the first temperature information to reduce the heating of the lithium battery. When the first temperature information exceeds the preset third temperature threshold, it indicates that there is a problem of over-temperature caused by a short circuit. At this time, the output conduction state of the lithium battery is disconnected through the output isolation circuit to reduce the danger of using the electrical equipment.

[0054] The object of the present invention is to provide a BMS mid-end safety protection circuit system and method. First, the force exerted by the lithium battery module on the cavity is obtained according to the pressure control module, and the working state of the pressure relief valve is adjusted by the pressure control module according to the pressure information to avoid the battery cell from being damaged due to excessive pressure; then, the temperature of the lithium battery is detected according to the temperature control module, and the refrigerator and the blower state controlled by the temperature control module are adjusted in real time according to the temperature value of the lithium battery to ensure the working temperature of the lithium battery; finally, the power supply power of the lithium battery is adjusted in real time through the output control module, and the output channel state of the lithium battery is cut off in an emergency to protect the electrical devices; the present invention improves the stability of the power supply system and improves the operation and maintenance efficiency of the power supply product through the BMS mid-end safety protection method.

[0055] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0056] 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 BMS mid-end safety protection circuit system, characterized in that: The circuit system comprises: Pressure control module, temperature control module and output control module; The pressure control module includes a pressure sensor circuit for detecting the interaction force between the battery and the housing, and a pressure relief valve control circuit for controlling the pressure relief state of the pressure relief valve according to the set pressure relief parameters; The temperature control module includes a temperature detection circuit for detecting the temperature value of the lithium battery, and a heat dissipation control circuit for adjusting the cooling effect and air volume according to the heat dissipation parameters; The output control module includes a current limiting control circuit for controlling the power supply current and an output isolation circuit for switching the output conduction state of the lithium battery.

2. A BMS mid-end safety protection circuit system according to claim 1, characterized in that: The pressure control module is specifically: It includes a sensor circuit and a pressure relief valve control circuit; The pressure sensor circuit is a sensor circuit that converts the interaction force between the battery and the housing into an analog-to-digital conversion value; The pressure relief valve control circuit is a control circuit that adjusts the pressure relief state according to a PWM signal.

3. A BMS mid-end safety protection circuit system according to claim 1, characterized in that: The temperature control module is specifically: Including temperature detection circuit and heat dissipation control circuit; The temperature detection circuit is a temperature sensor or a thermistor circuit, which is used to detect the temperature value of the lithium battery; The heat dissipation control circuit is a driving circuit for controlling the cooling power of the refrigerator and the blowing air volume of the blower.

4. A BMS mid-end safety protection circuit system according to claim 1, characterized in that: The output control module is specifically: Output isolation circuit, and current limiting control circuit; The output isolation circuit controls the conduction relay through the bypass isolation circuit to switch the output conduction state of the lithium battery; The current limiting control circuit is used to adjust the power supply current of the lithium battery by adjusting the feedback resistance of the current limiting control circuit.

5. A BMS mid-end safety protection method, applied to a BMS mid-end safety protection circuit system according to any one of claims 1 to 4, characterized in that: The method comprises: obtaining first pressure information; Determining whether the first pressure information is greater than a preset first pressure threshold; If yes, controlling the working state of the pressure relief valve according to the first pressure information; Determining a first air volume upper limit threshold according to the working state of the pressure relief valve; Acquiring first temperature information; Determining whether the first temperature information exceeds a preset standard temperature value; If yes, obtaining first air volume information and first cooling information according to the first temperature information and the standard temperature value; Determining whether the first air volume information exceeds the first air volume upper limit threshold; If yes, adjusting the first air volume information according to the first air volume information and the first air volume upper limit threshold; The first cooling information is set according to the first air volume upper limit threshold.

6. A BMS mid-end security protection method according to claim 5, characterized in that: The controlling the working state of the pressure relief valve according to the first pressure information is specifically: According to a preset first time period, first pressure information is collected and recorded to obtain a first pressure sequence; determining first slope information according to the first pressure sequence; Obtaining pressure release parameter information according to the first slope information; The working state of the pressure relief valve is controlled according to the pressure relief parameter information.

7. A BMS mid-end security protection method according to claim 5, characterized in that: The first air volume upper limit threshold is determined according to the working state of the pressure relief valve, specifically: Obtaining first slope information; Determining whether the first slope information exceeds a preset first slope threshold; If so, the air volume threshold table selects the first air volume corresponding table; If not, the air volume threshold table selects the second air volume corresponding table; Get decompression parameter information; A first air volume upper limit threshold is determined according to the pressure relief parameter information and the air volume threshold table.

8. A BMS mid-end security protection method according to claim 5, characterized in that: The obtaining of the first air volume information and the first cooling information according to the first temperature information and the standard temperature value is specifically: Collecting first temperature information according to a preset first time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a first proportional control amount, a first integral control amount, and a first differential control amount according to the first temperature deviation information and a set first control weight; Obtaining a first air volume control amount according to the first proportional control amount, the first integral control amount and the first differential control amount; The first air volume information is updated according to the first air volume control amount.

9. A BMS mid-end security protection method according to claim 5, characterized in that: The obtaining of the first air volume information and the first cooling information according to the first temperature information and the standard temperature value is specifically: Collecting first temperature information according to a preset second time period; Calculate the difference between the first temperature information and the standard temperature value to obtain first temperature deviation information; Obtaining a second proportional control amount and a second integral control amount according to the first temperature deviation information and a set second control weight; Obtaining a first refrigeration control amount according to the second proportional control amount and the second integral control amount; The first refrigeration information is updated according to the first refrigeration control amount.

10. A BMS mid-end security protection method according to claim 5, characterized in that: The adjusting the first cooling information according to the first air volume information and the first air volume upper limit threshold is specifically: Calculating a difference between the first air volume information and the first air volume upper limit threshold to obtain first air volume deviation information; determining a first cooling adjustment amount according to the first air volume deviation information; The first refrigeration information is adjusted according to the first refrigeration adjustment amount.

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