BMS charging control system and charging control method

Abstract

The invention discloses a BMS (Battery Management System) charging control system and a charging control method. The BMS charging control system comprises a data acquisition module used for acquiring working parameters of a main power supply, a standby power supply and a battery pack in real time and transmitting the working parameters of the main power supply, the standby power supply and the battery pack to a control module; and the control module is used for judging whether the main power supply and the standby power supply are in an under-voltage state or not according to the working parameters of the main power supply, the standby power supply and the battery pack, judging whether the power supply in the under-voltage state can be subjected to charging treatment or not, and controlling the working state of the switching module according to a judgment result. According to the invention, under the condition that the charging safety is ensured, the charging processing of the under-voltage power supply is realized, the use requirement of long-time power supply of the BMS system can be met, and the charging safety of the under-voltage power supply is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power replenishment control, and in particular to a BMS power replenishment control system and a power replenishment control method. Background Art

[0002] The BMS system is one of the important components of new energy vehicles. The BMS system requires constant power supply to work. At the same time, a redundant power supply needs to be provided in the BMS system with functional safety requirements so that when there is a problem with the main power supply, the system can switch to the backup power supply to ensure the normal operation of the BMS system, avoid corresponding safety problems in the car, and achieve safety control. However, the existing technology can only switch the main power supply to the backup power supply, and the power supply time is short and cannot meet the use requirements of long-term power supply. Summary of the invention

[0003] The present invention provides a BMS power replenishment control system and a power replenishment control method, so as to realize power replenishment processing for an undervoltage power supply under the condition of ensuring the safety of power replenishment, which can meet the use requirements of the BMS system for long-term power supply and has a safety diagnosis function, thereby increasing the safety of power replenishment for the undervoltage power supply.

[0004] According to one aspect of the present invention, a BMS power replenishment control system is provided, and the BMS power replenishment control system includes:

[0005] Battery pack, main power supply, backup power supply, data acquisition module, switching module, control module and BMS function module;

[0006] The first end of the main power supply is connected to the first end of the data acquisition module, the first end of the backup power supply is connected to the first end of the data acquisition module, the first end of the battery pack is connected to the first end of the data acquisition module, and the second end of the data acquisition module is connected to the first end of the control module; the data acquisition module is used to obtain the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmit the working parameters of the main power supply, the backup power supply and the battery pack to the control module; wherein the working parameters include output voltage value, output current value and current temperature value;

[0007] The first end of the main power supply is connected to the first end of the switching module, the first end of the backup power supply is connected to the second end of the switching module, the first end of the battery pack is connected to the third end of the switching module, the fourth end of the switching module is connected to the second end of the control module, and the third end of the control module is connected to the BMS functional module; the control module is used to determine whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determine whether the power supply in the undervoltage state can be recharged, and control the working state of the switching module according to the judgment result; wherein the working state of the switching module includes: a working state in which the third end of the switching module is simultaneously connected to the first end and the second end of the switching module; a working state in which the third end of the switching module is connected to the first end of the switching module and disconnected from the second end of the switching module; a working state in which the third end of the switching module is disconnected from the first end of the switching module and connected to the second end of the switching module; a working state in which the third end of the switching module is simultaneously disconnected from the first end of the switching module and connected to the second end of the switching module.

[0008] Furthermore, the control module is used to:

[0009] If the main power supply is in an undervoltage state, the main power supply voltage value is greater than or equal to the undervoltage threshold, and the working parameters of the battery pack are normal, a main power supply recharging signal is sent to the switching module to connect the first end of the switching module with the third end of the switching module, so that the battery pack recharges the main power supply, and the number of main power supply recharging times is recorded;

[0010] If the backup power supply is in an undervoltage state, the backup power supply voltage value is greater than or equal to the undervoltage threshold, and there is no abnormality in the working parameters of the battery pack, a backup power supply recharge signal is sent to the switching module to connect the second end of the switching module with the third end of the switching module, so that the battery pack can recharge the backup power supply, and the number of backup power supply recharges is recorded.

[0011] Furthermore, the BMS power supply control system also includes:

[0012] A conversion monitoring module, wherein the first end of the conversion monitoring module is connected to the fifth end of the switching module, and the second end of the conversion monitoring module is connected to the third end of the control module; the control module is also used for:

[0013] If the main power supply is in an undervoltage state, the backup power supply is in a non-undervoltage state, and the voltage value of the main power supply is less than the undervoltage threshold and / or the operating parameters of the battery pack are abnormal, a backup power supply switching signal is sent to the switching module to connect the second end of the switching module with the third end of the switching module, so that the backup power supply supplies power to the BMS functional module;

[0014] If the backup power supply is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold value and the working parameters of the battery pack are normal, a battery pack switching signal is sent to the switching module to connect the third terminal of the switching module with the fifth terminal of the switching module, so as to step down the first voltage signal transmitted by the battery pack, generate a first step-down signal, and transmit the first step-down signal to the BMS functional module through the control module, so as to realize that the battery pack supplies power to the BMS functional module;

[0015] If the backup power supply is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold and the operating parameters of the battery pack are abnormal, a first cut-off signal is sent to the switching module to control the main power supply, the backup power supply and the battery pack to stop supplying power to the BMS functional module.

[0016] Furthermore, the BMS power supply control system also includes:

[0017] A safety logic module, wherein a first end of the safety logic module is connected to a third end of the conversion monitoring module, and a second end of the safety logic module is connected to a sixth end of the switching module;

[0018] The control module is also used to send a first fault signal to the switching module when at least one of the battery pack, the main power supply and the backup power supply fails, so that the control module controls the failed power supply to stop working through the switching module;

[0019] The control module is also used to send a second fault signal to the conversion monitoring module when the failed power supply cannot be controlled to stop working;

[0020] The conversion monitoring module is used to generate a second cut-off signal according to the second fault signal, and transmit the second cut-off signal to the safety logic module;

[0021] The safety logic module is used to control the switching module to perform a disconnection process after receiving the second disconnection signal, so that the failed power supply stops working.

[0022] Furthermore, the BMS power supply control system also includes:

[0023] Wake-up source module;

[0024] The wake-up source module is connected to the control module, and is used to send a wake-up signal to the control module at a first preset frequency so that the control module starts to obtain the working parameters of the main power supply, the backup power supply and the battery pack in real time.

[0025] Further, the data acquisition module includes a battery pack data acquisition unit, a main power supply data acquisition unit and a backup power supply data acquisition unit;

[0026] A first end of the battery pack data acquisition unit is connected to a first end of the battery pack, a second end of the battery pack data acquisition unit is connected to a first end of the control module, and the battery pack data acquisition unit is used to obtain working parameters of the battery pack in real time and transmit the working parameters of the battery pack to the control module;

[0027] A first end of the main power data acquisition unit is connected to a first end of the main power supply, a second end of the main power data acquisition unit is connected to a first end of the control module, and the main power data acquisition unit is used to obtain working parameters of the main power supply in real time and transmit the working parameters of the main power supply to the control module;

[0028] The first end of the backup power supply data acquisition unit is connected to the first end of the backup power supply, and the second end of the backup power supply data acquisition unit is connected to the first end of the control module. The backup power supply data acquisition unit is used to obtain the working parameters of the backup battery in real time and transmit the working parameters of the backup battery to the control module.

[0029] Furthermore, the BMS power supply control system also includes:

[0030] Digital-to-analog conversion module;

[0031] The second end of the data acquisition module is connected to the first end of the digital-to-analog conversion module, and the second end of the digital-to-analog conversion module is connected to the first end of the control module;

[0032] The data acquisition module is used to convert the working parameters of the main power supply, the backup power supply and the battery pack into a first analog signal, and transmit the first analog signal to the digital-to-analog conversion module;

[0033] The digital-to-analog conversion module is used to perform digital-to-analog conversion processing on the first analog signal to generate a first digital signal, and transmit the first digital signal to the control module;

[0034] The control module is used to determine whether the main power supply and the backup power supply are in an undervoltage state according to the first digital signal, and whether the power supply in the undervoltage state can be supplemented with power, and control the working state of the switching module according to the judgment result.

[0035] Furthermore, the BMS power supply control system also includes:

[0036] Communication module;

[0037] The first end of the communication module is connected to the fourth end of the control module, and the second end of the communication module is connected to the host computer;

[0038] The control module is also used to transmit fault information to the upper computer through the communication module when at least one of the battery pack, the main power supply and the backup power supply fails.

[0039] Furthermore, the BMS power supply control system also includes:

[0040] Relay execution charging module;

[0041] The first end of the relay execution charging module is connected to the charging interface of the battery pack, the second end of the relay execution charging module is connected to the charging device, and the third end of the relay execution charging module is connected to the control module;

[0042] The relay execution charging module is used to obtain the charging voltage signal output by the charging device after being connected to the charging device, and transmit the obtained charging voltage signal to the control module;

[0043] The control module is used to verify the charging voltage signal and control the relay to execute the working state of the charging module according to the verification result.

[0044] According to another aspect of the present invention, a BMS power replenishment control method is provided, which is used to control the BMS power replenishment control system described in any one of the above embodiments. The BMS power replenishment control method includes:

[0045] The data acquisition module respectively acquires the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmits the working parameters of the main power supply, the backup power supply and the battery pack to the control module; wherein the working parameters include the output voltage value, the output current value and the current temperature value;

[0046] The control module determines whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determines whether the power supply in the undervoltage state can be recharged, and controls the working state of the switching module according to the judgment result.

[0047] The BMS power replenishment control system designed in the embodiment of the present invention includes: a battery pack, a main power supply, a backup power supply, a data acquisition module, a switching module, a control module and a BMS functional module; by connecting the first end of the main power supply to the first end of the data acquisition module, the first end of the backup power supply to the first end of the data acquisition module, the first end of the battery pack to the first end of the data acquisition module, the second end of the data acquisition module to the first end of the control module, the first end of the main power supply to the first end of the switching module, the first end of the backup power supply to the second end of the switching module, the first end of the battery pack to the third end of the switching module, the fourth end of the switching module to the second end of the control module, and the third end of the control module to the BMS functional module, so that the data acquisition module can obtain the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmit the working parameters of the main power supply, the backup power supply and the battery pack to the control module. After receiving the working parameters of the main power supply, the backup power supply and the battery pack, the control module determines whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determines whether the power supply in the undervoltage state can be compensated, and controls the working state of the switching module according to the judgment result. Compared with the prior art, which can only switch the working status of two power supplies by switching switches, the BMS power replenishment control system designed in the embodiment of the present invention can realize power replenishment processing for the undervoltage power supply while ensuring the safety of power replenishment when the main power supply and / or the backup power supply is in an undervoltage state, if the undervoltage power supply meets the power replenishment conditions, thereby increasing the safety of power replenishment for the undervoltage power supply.

[0048] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 It is a structural schematic diagram of a BMS power supplement control system provided according to an embodiment of the present invention;

[0051] Figure 2 is a structural schematic diagram of another BMS power supplement control system provided according to an embodiment of the present invention;

[0052] Figure 3It is a structural schematic diagram of another BMS power supplement control system provided according to an embodiment of the present invention;

[0053] Figure 4 2 is a schematic diagram of the structure of another BMS power supplement control system provided according to an embodiment of the present invention;

[0054] Figure 5 is a structural schematic diagram of another BMS power supplement control system provided according to an embodiment of the present invention;

[0055] Figure 6 It is a structural schematic diagram of another BMS power supplement control system provided according to an embodiment of the present invention;

[0056] Figure 7 2 is a schematic diagram of the structure of another BMS power supplement control system provided according to an embodiment of the present invention;

[0057] Figure 8 is a structural schematic diagram of another BMS power supplement control system provided according to an embodiment of the present invention;

[0058] Fig. 9 is a flow chart of a BMS power replenishment control method provided according to an embodiment of the present invention;

[0059] Fig.10 It is a flowchart of a specific method for BMS power replenishment control provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 this field without creative work should fall within the scope of protection of the present invention.

[0061] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0062] The embodiment of the present invention provides a BMS power supply control system. Figure 1 is a schematic diagram of a BMS power supply control system provided according to an embodiment of the present invention, with reference to Figure 1 , BMS power supply control system includes:

[0063] Battery pack 1, main power supply 2, backup power supply 3, data acquisition module 4, switching module 5, control module 6 and BMS function module 7;

[0064] The first end of the main power supply 2 is connected to the first end of the data acquisition module 4, the first end of the backup power supply 3 is connected to the first end of the data acquisition module 4, the first end of the battery pack 1 is connected to the first end of the data acquisition module 4, and the second end of the data acquisition module 4 is connected to the first end of the control module 6; the data acquisition module 4 is used to obtain the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 in real time, and transmit the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 to the control module 6; wherein the working parameters include the output voltage value, the output current value and the current temperature value;

[0065] The first end of the main power supply 2 is connected to the first end of the switching module 5, the first end of the backup power supply 3 is connected to the second end of the switching module 5, the first end of the battery pack 1 is connected to the third end of the switching module 5, the fourth end of the switching module 5 is connected to the second end of the control module 6, and the third end of the control module 6 is connected to the BMS function module 7; the control module 6 is used to determine whether the main power supply 2 and the backup power supply 3 are in an undervoltage state according to the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1, and determine whether the power supply in the undervoltage state can be recharged, and control the working state of the switching module 5 according to the judgment result; wherein the working state of the switching module 5 includes: a working state in which the third end of the switching module 5 is simultaneously connected to the first end and the second end of the switching module 5; a working state in which the third end of the switching module 5 is connected to the first end of the switching module 5 and disconnected from the second end of the switching module 5; a working state in which the third end of the switching module 5 is disconnected from the first end of the switching module 5 and connected to the second end of the switching module 5; a working state in which the third end of the switching module 5 is simultaneously disconnected from the first end of the switching module 5 and connected to the second end of the switching module 5.

[0066] Specifically, after the BMS power replenishment control system is awakened, or under the condition that the BMS power replenishment control system is operating normally, the data acquisition module 4 will collect the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 according to the second preset frequency, and transmit the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 to the control module 6. After receiving the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1, the control module 6 will judge whether the battery pack 1 can supply power to the main power supply and the backup power supply under the current conditions according to the output voltage value, output current value and current temperature value of the battery pack 1; and judge whether the working state of the main power supply 2 is good under the current conditions, whether it is in an undervoltage state, and if it is in an undervoltage state, judge whether the main power supply 2 can perform power replenishment processing according to the current voltage value of the main power supply if it is in an undervoltage state; at the same time, judge whether the working state of the backup power supply 3 is good under the current conditions, whether it is in an undervoltage state, and if it is in an undervoltage state, judge whether the backup power supply 3 can perform power replenishment processing according to the output voltage value, output current value and current temperature value of the backup power supply 3. If both the main power supply 2 and the backup power supply 3 are in an undervoltage state, and both the main power supply 2 and the backup power supply 3 can be recharged, the control changes the working state of the switching module 5 so that the battery pack 1 is connected to the main power supply 2 and the backup power supply 3 at the same time; if the main power supply 2 is in an undervoltage state, and the backup power supply 3 can be recharged, and the backup power supply 3 is in a non-undervoltage state, the control changes the working state of the switching module 5 so that the battery pack 1 is connected to the main power supply 2 and disconnected from the backup power supply 3; if the backup power supply 3 is in an undervoltage state, and the backup power supply 3 can be recharged, and the main power supply 2 is in a non-undervoltage state, the control changes the working state of the switching module 5 so that the battery pack 1 is connected to the backup power supply 3 and disconnected from the main power supply 2; if both the main power supply 2 and the backup power supply 3 are in a non-undervoltage state, the control changes the working state of the switching module 5 so that the battery pack 1 is disconnected from the main power supply 2 and the backup power supply 3 at the same time. Among them, the second preset frequency can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0067] The BMS power replenishment control system designed in the embodiment of the present invention includes: a battery pack 1, a main power supply 2, a backup power supply 3, a data acquisition module 4, a switching module 5, a control module 6 and a BMS function module 7; by connecting the first end of the main power supply 2 to the first end of the data acquisition module 4, the first end of the backup power supply 3 to the first end of the data acquisition module 4, the first end of the battery pack 1 to the first end of the data acquisition module 4, the second end of the data acquisition module 4 to the first end of the control module 6, the first end of the main power supply 2 to the first end of the switching module 5, the first end of the backup power supply 3 to the second end of the switching module 5, and the first end of the battery pack 1 to the third end of the switching module 5. The fourth end of the switching module 5 is connected to the second end of the control module 6, and the third end of the control module 6 is connected to the BMS function module 7, so that the data acquisition module 4 can obtain the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 in real time, and transmit the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 to the control module 6. After receiving the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1, the control module 6 determines whether the main power supply 2 and the backup power supply 3 are in an undervoltage state according to the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1, and determines whether the power supply in the undervoltage state can be recharged, and controls the working state of the switching module 5 according to the judgment result. Compared with the prior art, which can only switch the working state of the two power supplies by switching the switch, the BMS recharge control system designed in the embodiment of the present invention can realize the recharge processing of the undervoltage power supply under the condition of ensuring the safety of recharge when the main power supply 2 and / or the backup power supply 3 is in an undervoltage state, if the undervoltage power supply meets the recharge condition, which can meet the use requirements of the BMS system for long-term power supply and increase the safety of recharge of the undervoltage power supply.

[0068] Furthermore, the control module is used to:

[0069] If the main power supply is in an undervoltage state, the main power supply voltage value is greater than or equal to the undervoltage threshold, and the working parameters of the battery pack are normal, a main power supply recharging signal is sent to the switching module to connect the first end of the switching module with the third end of the switching module, so that the battery pack recharges the main power supply, and the number of main power supply recharging times is recorded;

[0070] If the backup power supply is in an undervoltage state, the backup power supply voltage value is greater than or equal to the undervoltage threshold, and there is no abnormality in the working parameters of the battery pack, a backup power supply recharge signal is sent to the switching module to connect the second end of the switching module with the third end of the switching module, so that the battery pack can recharge the backup power supply, and the number of backup power supply recharges is recorded.

[0071] Specifically, if the main power supply is in an undervoltage state, and the main power supply voltage value is greater than or equal to the undervoltage threshold, it means that the main power supply voltage value is in a normal range at this time, and there will be no safety hazards in the process of replenishing power. At this time, the working parameters of the battery pack are normal, and the main power supply can be replenished normally. At this time, the control module will send a main power supply replenishment signal to the switching module to connect the first end of the main power supply to the first end of the battery pack, thereby realizing the battery pack replenishing power for the main power supply, and recording the number of times the battery pack replenishes power for the main power supply; if the backup power supply is in an undervoltage state, and the backup power supply voltage value is greater than or equal to the undervoltage threshold, it means that the backup power supply voltage value is in a normal range at this time, and there will be no safety hazards in the process of replenishing power. At this time, the working parameters of the battery pack are normal, and the backup power supply can be replenished normally. At this time, the control module will send a backup power supply replenishment signal to the switching module to connect the first end of the backup power supply to the first end of the battery pack, thereby realizing the battery pack replenishing power for the backup power supply, and recording the number of times the battery pack replenishes power for the backup power supply.

[0072] Furthermore, Figure 2 is a schematic diagram of the structure of another BMS power supply control system provided according to an embodiment of the present invention, referring to Figure 2 , the BMS power supply control system also includes:

[0073] The conversion monitoring module 8 has a first end connected to the fifth end of the switching module 5, and a second end connected to the third end of the control module 6; the control module 6 is further used for:

[0074] If the main power supply 2 is in an undervoltage state, the backup power supply 3 is in a non-undervoltage state, and the voltage value of the main power supply is less than the undervoltage threshold and / or the operating parameters of the battery pack 1 are abnormal, a backup power supply switching signal is sent to the switching module 5 to connect the second end of the switching module 5 with the third end of the switching module 5, so that the backup power supply 3 supplies power to the BMS functional module 7;

[0075] If the backup power supply 3 is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold value and the working parameters of the battery pack 1 are normal, a battery pack switching signal is sent to the switching module 5, so that the third terminal of the switching module 5 is connected to the fifth terminal of the switching module 5, so as to reduce the voltage of the first voltage signal transmitted by the battery pack 1, generate a first voltage reduction signal, and transmit the first voltage reduction signal to the BMS function module 7 through the control module 6, so that the battery pack 1 supplies power to the BMS function module 7;

[0076] If the backup power supply 3 is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold and the operating parameters of the battery pack 1 are abnormal, a first cut-off signal is sent to the switching module 5 to control the main power supply 2, the backup power supply 3 and the battery pack 1 to stop supplying power to the BMS functional module 7.

[0077] Specifically, if the main power supply 2 is in an undervoltage state and the backup power supply 3 is in a non-undervoltage state, it means that the main power supply 2 cannot normally supply power to the BMS functional module 7 at this time, while the backup power supply 3 can normally supply power to the BMS functional module 7 at this time. If the main power supply voltage value is less than the undervoltage threshold, it means that the main power supply voltage value is in an abnormal range at this time, and there will be safety hazards in the process of replenishing power. If the working parameters of the battery pack 1 are abnormal, it means that the battery pack 1 cannot normally replenish the main power supply. At this time, the control module 6 will send a backup power switching signal to the switching module 5 to connect the first end of the backup power supply 3 to the first end of the battery pack 1, thereby realizing that the backup power supply 3 supplies power to the BMS functional module 7.

[0078] If the backup power supply 3 is in an undervoltage state, it means that the main power supply 2 is in an undervoltage state and cannot supply power to the BMS functional module 7. The backup power supply 3 has been switched to supply power to the BMS functional module 7. If the backup power supply voltage value is less than the undervoltage threshold and the working parameters of the battery pack 1 are normal, it means that the backup power supply voltage value is in an abnormal range and there will be safety hazards during the power replenishment process. However, the working parameters of the battery pack 1 are normal, indicating that the battery pack 1 can output electrical energy normally. At this time, the control module 6 will send a battery pack switching signal to the switching module 5 to connect the first end of the battery pack 1 to the first end of the conversion monitoring module 8, so as to reduce the voltage of the first voltage signal transmitted by the battery pack 1, generate a first voltage reduction signal, and transmit the first voltage reduction signal to the BMS functional module 7 through the control module 6, so as to realize that the battery pack 1 supplies power to the BMS functional module 7.

[0079] If the backup power supply 3 is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold and the working parameters of the battery pack 1 are abnormal, it means that the battery pack 1, the main power supply 2 and the backup power supply 3 are unable to normally supply power to the BMS functional module 7. At this time, the control module will send a first cut-off signal to the switching module 5 to control the main power supply 2, the backup power supply 3 and the battery pack 1 to stop supplying power to the BMS functional module 7, so as to avoid the main power supply 2, the backup power supply 3 or the battery pack 1 continuing to supply power to the BMS functional module 7, which may cause safety hazards.

[0080] Furthermore, Figure 3 is a structural diagram of another BMS power supply control system provided according to an embodiment of the present invention, with reference to Figure 3 , the BMS power supply control system also includes:

[0081] A safety logic module 9, wherein a first end of the safety logic module 9 is connected to a third end of the conversion monitoring module 8, and a second end of the safety logic module 9 is connected to a sixth end of the switching module 5;

[0082] The control module 6 is also used to send a first fault signal to the switching module 5 when at least one of the battery pack 1, the main power supply 2 and the backup power supply 3 fails, so that the control module 6 controls the failed power supply to stop working through the switching module 5;

[0083] The control module 6 is also used to send a second fault signal to the conversion monitoring module 8 when the failed power supply cannot be controlled to stop working;

[0084] The conversion monitoring module 8 is used to generate a second cut-off signal according to the second fault signal, and transmit the second cut-off signal to the safety logic module 9;

[0085] The safety logic module 9 is used to control the switching module 5 to perform a disconnection process after receiving the second disconnection signal, so that the failed power supply stops working.

[0086] Specifically, when at least one of the power sources among the battery pack 1, the main power supply 2 and the backup power supply 3 fails, the control module 6 will control the switching module 5 to cut off the power supply of the faulty power supply to the BMS functional module 7; and when the control module 6 is unable to cut off the power supply of the faulty power supply to the BMS functional module 7 by controlling the switching module 5, the control module 6 will send a fault signal to the conversion monitoring module 8. After receiving the fault signal, the conversion monitoring module 8 will generate a second cut-off signal according to the fault signal, and transmit the second cut-off signal to the safety logic module 9, and then control the switching module 5 to cut off the faulty power supply through the safety logic module 9, so that the faulty power supply stops supplying power to the BMS functional module 7, thereby further improving the safety of the BMS power replenishment control system.

[0087] Furthermore, Figure 4 is a structural diagram of another BMS power supply control system provided according to an embodiment of the present invention, with reference to Figure 4 , the BMS power supply control system also includes:

[0088] Wake-up source module 10;

[0089] The wake-up source module 10 is connected to the control module 6, and is used to send a wake-up signal to the control module 6 at a first preset frequency so that the control module 6 starts to obtain the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 in real time.

[0090] The first preset frequency may be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0091] Specifically, the wake-up source module 10 can be set to send a wake-up signal to the control module 6 at a first preset frequency to implement regular detection of the operating parameters of the main power supply 2, backup power supply 3 and battery pack 1 in the BMS power replenishment control system. For example, if at least one of the main power supply 2 and the backup power supply 3 is undervoltage, the undervoltage power supply can be promptly supplemented by the battery pack 1.

[0092] Furthermore, Figure 5 is a schematic diagram of the structure of another BMS power supply control system provided according to an embodiment of the present invention, referring to Figure 5 , the data acquisition module includes a battery pack data acquisition unit 41, a main power supply data acquisition unit 42 and a backup power supply data acquisition unit 43;

[0093] A first end of the battery pack data acquisition unit 41 is connected to a first end of the battery pack 1, and a second end of the battery pack data acquisition unit 41 is connected to a first end of the control module 6. The battery pack data acquisition unit 41 is used to obtain the working parameters of the battery pack 1 in real time, and transmit the working parameters of the battery pack 1 to the control module 6;

[0094] A first end of the main power data acquisition unit 42 is connected to a first end of the main power supply 2, and a second end of the main power data acquisition unit 42 is connected to a first end of the control module 6. The main power data acquisition unit 42 is used to obtain working parameters of the main power supply 2 in real time, and transmit the working parameters of the main power supply 2 to the control module 6;

[0095] The first end of the backup power supply data acquisition unit 43 is connected to the first end of the backup power supply 3, and the second end of the backup power supply data acquisition unit 43 is connected to the first end of the control module 6. The backup power supply data acquisition unit 43 is used to obtain the working parameters of the backup battery 3 in real time and transmit the working parameters of the backup battery 3 to the control module 6.

[0096] Specifically, after the BMS power replenishment control system is awakened, or under the condition that the BMS power replenishment control system is working normally, the battery pack data acquisition unit 41 will collect the output voltage value, output current value and current temperature value of the battery pack 1 according to the third preset frequency, and transmit the output voltage value, output current value and current temperature value of the battery pack 1 to the control module 6; at the same time, the main power supply data acquisition unit 42 will collect the output voltage value, output current value and current temperature value of the main power supply 2 according to the third preset frequency, and transmit the output voltage value, output current value and current temperature value of the main power supply 2 to the control module 6; at the same time, the backup power supply data acquisition unit 43 will collect the output voltage value, output current value and current temperature value of the backup power supply 3 according to the third preset frequency, and transmit the output voltage value, output current value and current temperature value of the backup power supply 3 to the control module 6. Among them, the third preset frequency can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0097] Furthermore, Figure 6 is a structural diagram of another BMS power supply control system provided according to an embodiment of the present invention, with reference to Figure 6 , the BMS power supply control system also includes:

[0098] Digital-to-analog conversion module 11;

[0099] The second end of the data acquisition module 4 is connected to the first end of the digital-to-analog conversion module 11, and the second end of the digital-to-analog conversion module 11 is connected to the first end of the control module 6;

[0100] The data acquisition module 4 is used to convert the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 into a first analog signal, and transmit the first analog signal to the digital-to-analog conversion module 11;

[0101] The digital-to-analog conversion module 11 is used to perform digital-to-analog conversion processing on the first analog signal to generate a first digital signal, and transmit the first digital signal to the control module 6;

[0102] The control module 6 is used to determine whether the main power supply 2 and the backup power supply 3 are in an undervoltage state according to the first digital signal, and whether the power supply in the undervoltage state can be supplemented with power, and control the working state of the switching module 5 according to the judgment result.

[0103] Specifically, the data acquisition module 4 will convert the working parameters of the main power supply 2, the backup power supply 3 and the battery pack 1 into a first analog signal, and transmit the first analog signal to the digital-to-analog conversion module 11 for digital-to-analog conversion to generate a first digital signal, and transmit the first digital signal to the control module 6. The control module 6 will determine whether the main power supply 2 and the backup power supply 3 are in an undervoltage state based on the first digital signal, and determine whether the power supply in the undervoltage state can be recharged, and control the working state of the switching module 5 based on the judgment result.

[0104] Furthermore, Figure 7 is a structural diagram of another BMS power supply control system provided according to an embodiment of the present invention, with reference to Figure 7 , the BMS power supply control system also includes:

[0105] Communication module 12;

[0106] The first end of the communication module 12 is connected to the fourth end of the control module 6, and the second end of the communication module 12 is connected to the host computer a;

[0107] The control module 6 is also used to transmit fault information to the upper computer a through the communication module 12 when at least one of the battery pack 1, the main power supply 2 and the backup power supply 3 fails.

[0108] Specifically, when at least one of the battery pack 1, the main power supply 2 and the backup power supply 3 fails, the control module 6 transmits fault information to the upper computer a through the communication module 12 to implement fault feedback of the faulty power supply.

[0109] Furthermore, Figure 8 is a schematic diagram of the structure of another BMS power supply control system provided according to an embodiment of the present invention, referring to Figure 8 , the BMS power supply control system also includes:

[0110] Relay execution charging module 13;

[0111] The first end of the relay execution charging module 13 is connected to the charging interface of the battery pack 1, the second end of the relay execution charging module 13 is connected to the charging device b, and the third end of the relay execution charging module 13 is connected to the control module 6;

[0112] The relay execution charging module 13 is used to obtain the charging voltage signal output by the charging device b after being connected to the charging device b, and transmit the obtained charging voltage signal to the control module 6;

[0113] The control module 6 is used to verify the charging voltage signal and control the relay to execute the working state of the charging module 13 according to the verification result.

[0114] Specifically, in the process of charging the battery pack 1 through the charging device b, the relay execution charging module 13 will first obtain the charging voltage signal output by the charging device b, and transmit the charging voltage signal to the control module 6 for verification, so as to avoid damage to the battery pack 1 due to the abnormal charging voltage output by the charging device b. After verifying that there is no abnormality in the charging voltage signal, the control module 6 sends a charging connection signal to the relay execution charging module 13 to charge the battery pack 1; if the charging voltage signal is verified to be abnormal, a charging disconnection signal is sent to the relay execution charging module 13 to stop charging the battery pack 1.

[0115] The embodiment of the present invention provides a BMS power replenishment control method. Fig. 9 is a flow chart of a BMS power replenishment control method provided according to an embodiment of the present invention, referring to Fig. 9 , BMS power replenishment control methods include:

[0116] S110, the data acquisition module obtains the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmits the working parameters of the main power supply, the backup power supply and the battery pack to the control module; wherein the working parameters include the output voltage value, the output current value and the current temperature value.

[0117] S120, the control module determines whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determines whether the power supply in the undervoltage state can be recharged, and controls the working state of the switching module according to the judgment result.

[0118] The BMS power replenishment control method designed in the embodiment of the present invention obtains the working parameters of the main power supply, the backup power supply and the battery pack in real time through the data acquisition module, and transmits the working parameters of the main power supply, the backup power supply and the battery pack to the control module. After receiving the working parameters of the main power supply, the backup power supply and the battery pack, the control module determines whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determines whether the power supply in the undervoltage state can be recharged, and controls the working state of the switching module according to the judgment result. Compared with the prior art, which can only switch the working state of the two power supplies by switching the switch, the BMS power replenishment control system designed in the embodiment of the present invention can realize the power replenishment of the undervoltage power supply under the condition of ensuring the safety of the power replenishment when the main power supply and / or the backup power supply is in an undervoltage state, if the undervoltage power supply meets the power replenishment condition, which can meet the use requirements of the BMS system for long-term power supply, and has a safety diagnosis function, which increases the safety of recharging the undervoltage power supply.

[0119] Exemplarily, the present invention provides a specific BMS power supplement control method. Fig.10 is a flowchart of a specific method for BMS power replenishment control provided according to an embodiment of the present invention, refer to Fig.10 , the specific description is as follows:

[0120] S101, start; execute step S102.

[0121] S102, the wake-up source module sends a wake-up signal to the control module; and executing step S103.

[0122] S103, BMS power replenishment control system is initialized; execute step S104.

[0123] S104, the data acquisition module obtains the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmits the working parameters to the control module; execute step S105.

[0124] S105, the control module determines whether the main power supply and the backup power supply are in an undervoltage state, and determines the undervoltage power supply that needs to be recharged; if so, execute step S106, if not, execute step S203.

[0125] S106. The control module replenishes the undervoltage power supply by controlling the working state of the switching module; and executing step S107.

[0126] S107, the control module determines whether the battery pack, the main power supply and the backup power supply are faulty; if so, execute step S108, if not, execute step S105.

[0127] S108, the control module controls the failed power supply to stop working through the switching module, and transmits the fault information of the failed power supply to the host computer through the communication module; and executes step S109.

[0128] S109, the control module determines whether the faulty power supply stops working; if so, execute step S104, if not, execute step S201.

[0129] S201, the control module controls the safety logic module to change the working state of the faulty power supply by switching the monitoring module, so that the faulty power supply stops working; execute step S202.

[0130] S202, the control module records the number of times the main power supply and the backup power supply are replenished; and executes step S203.

[0131] S203, end.

[0132] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0133] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A BMS power supply control system, characterized in that: include: Battery pack, main power supply, backup power supply, data acquisition module, switching module, control module and BMS function module; The first end of the main power supply is connected to the first end of the data acquisition module, the first end of the backup power supply is connected to the first end of the data acquisition module, the first end of the battery pack is connected to the first end of the data acquisition module, and the second end of the data acquisition module is connected to the first end of the control module; the data acquisition module is used to obtain the operating parameters of the main power supply, the backup power supply and the battery pack in real time, and transmit the operating parameters of the main power supply, the backup power supply and the battery pack to the control module; wherein the operating parameters include output voltage value, output current value and current temperature value; The first end of the main power supply is connected to the first end of the switching module, the first end of the backup power supply is connected to the second end of the switching module, the first end of the battery pack is connected to the third end of the switching module, the fourth end of the switching module is connected to the second end of the control module, and the third end of the control module is connected to the BMS function module; The control module is used to determine whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and to determine whether the power supply in the undervoltage state can be recharged, and to control the working state of the switching module according to the judgment result; wherein, the working state of the switching module includes: a working state in which the third end of the switching module is simultaneously connected to the first end and the second end of the switching module; a working state in which the third end of the switching module is connected to the first end of the switching module and disconnected from the second end of the switching module; a working state in which the third end of the switching module is disconnected from the first end of the switching module and connected to the second end of the switching module; a working state in which the third end of the switching module is simultaneously disconnected from the first end of the switching module and connected to the second end of the switching module.

2. The BMS power supply control system according to claim 1, characterized in that: The control module is used for: If the main power supply is in an undervoltage state, the main power supply voltage value is greater than or equal to the undervoltage threshold, and the operating parameters of the battery pack are normal, a main power supply recharging signal is sent to the switching module to connect the first end of the switching module with the third end of the switching module, so that the battery pack recharges the main power supply, and the number of main power supply recharging times is recorded; If the backup power supply is in an undervoltage state, the backup power supply voltage value is greater than or equal to the undervoltage threshold, and there is no abnormality in the working parameters of the battery pack, a backup power supply recharge signal is sent to the switching module to connect the second end of the switching module with the third end of the switching module, so that the battery pack can recharge the backup power supply, and the number of backup power supply recharges is recorded.

3. The BMS power supply control system according to claim 1, characterized in that: Also includes: A conversion monitoring module, wherein a first end of the conversion monitoring module is connected to a fifth end of the switching module, and a second end of the conversion monitoring module is connected to a third end of the control module; The control module is also used for: If the main power supply is in an undervoltage state, the backup power supply is in a non-undervoltage state, and the voltage value of the main power supply is less than the undervoltage threshold and / or the operating parameters of the battery pack are abnormal, a backup power supply switching signal is sent to the switching module to connect the second end of the switching module with the third end of the switching module, so that the backup power supply supplies power to the BMS functional module; If the backup power supply is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold value and the operating parameters of the battery pack are normal, a battery pack switching signal is sent to the switching module to connect the third terminal of the switching module with the fifth terminal of the switching module, so as to reduce the voltage of the first voltage signal transmitted by the battery pack and generate a first reduced voltage signal, and transmit the first reduced voltage signal to the BMS functional module through the control module, so as to realize that the battery pack supplies power to the BMS functional module; If the backup power supply is in an undervoltage state, the backup power supply voltage value is less than the undervoltage threshold and the operating parameters of the battery pack are abnormal, a first cut-off signal is sent to the switching module to control the main power supply, the backup power supply and the battery pack to stop supplying power to the BMS functional module.

4. The BMS power supply control system according to claim 3 is characterized in that: Also includes: A safety logic module, wherein a first end of the safety logic module is connected to a third end of the conversion monitoring module, and a second end of the safety logic module is connected to a sixth end of the switching module; The control module is also used to send a first fault signal to the switching module when at least one of the battery pack, the main power supply and the backup power supply fails, so that the control module controls the failed power supply to stop working through the switching module; The control module is also used to send a second fault signal to the conversion monitoring module when the failed power supply cannot be controlled to stop working; The conversion monitoring module is used to generate a second cut-off signal according to the second fault signal, and transmit the second cut-off signal to the safety logic module; The safety logic module is used to control the switching module to perform a disconnection process after receiving the second cut-off signal, so that the failed power supply stops working.

5. The BMS power supply control system according to claim 3, characterized in that: Also includes: Wake-up source module; The wake-up source module is connected to the control module, and is used to send a wake-up signal to the control module at a first preset frequency so that the control module starts to obtain the working parameters of the main power supply, the backup power supply and the battery pack in real time.

6. The BMS power supply control system according to claim 1, characterized in that: The data acquisition module includes a battery pack data acquisition unit, a main power supply data acquisition unit and a backup power supply data acquisition unit; The first end of the battery pack data acquisition unit is connected to the first end of the battery pack, and the second end of the battery pack data acquisition unit is connected to the first end of the control module. The battery pack data acquisition unit is used to obtain the operating parameters of the battery pack in real time and transmit the operating parameters of the battery pack to the control module; The first end of the main power data acquisition unit is connected to the first end of the main power supply, and the second end of the main power data acquisition unit is connected to the first end of the control module. The main power data acquisition unit is used to obtain the working parameters of the main power supply in real time and transmit the working parameters of the main power supply to the control module; The first end of the backup power supply data acquisition unit is connected to the first end of the backup power supply, and the second end of the backup power supply data acquisition unit is connected to the first end of the control module. The backup power supply data acquisition unit is used to obtain the working parameters of the backup battery in real time and transmit the working parameters of the backup battery to the control module.

7. The BMS power supply control system according to claim 1, characterized in that: Also includes: Digital-to-analog conversion module; The second end of the data acquisition module is connected to the first end of the digital-to-analog conversion module, and the second end of the digital-to-analog conversion module is connected to the first end of the control module; The data acquisition module is used to convert the working parameters of the main power supply, the backup power supply and the battery pack into a first analog signal, and transmit the first analog signal to the digital-to-analog conversion module; The digital-to-analog conversion module is used to perform digital-to-analog conversion processing on the first analog signal to generate a first digital signal, and transmit the first digital signal to the control module; The control module is used to determine whether the main power supply and the backup power supply are in an undervoltage state according to the first digital signal, and whether the power supply in the undervoltage state can be recharged, and control the working state of the switching module according to the judgment result.

8. The BMS power supply control system according to claim 4, characterized in that: Also includes: Communication module; The first end of the communication module is connected to the fourth end of the control module, and the second end of the communication module is connected to the host computer; The control module is also used to transmit fault information to the host computer through the communication module when at least one of the battery pack, the main power supply and the backup power supply fails.

9. The BMS power supply control system according to claim 1, characterized in that: Also includes: Relay execution charging module; The first end of the relay execution charging module is connected to the charging interface of the battery pack, the second end of the relay execution charging module is connected to the charging device, and the third end of the relay execution charging module is connected to the control module; The relay execution charging module is used to obtain the charging voltage signal output by the charging device after being connected to the charging device, and transmit the obtained charging voltage signal to the control module; The control module is used to verify the charging voltage signal and control the relay to execute the working state of the charging module according to the verification result.

10. A BMS power supplement control method, used to control the BMS power supplement control system according to any one of claims 1 to 9, characterized in that: include: The data acquisition module respectively acquires the working parameters of the main power supply, the backup power supply and the battery pack in real time, and transmits the working parameters of the main power supply, the backup power supply and the battery pack to the control module; wherein the working parameters include output voltage value, output current value and current temperature value; The control module determines whether the main power supply and the backup power supply are in an undervoltage state according to the working parameters of the main power supply, the backup power supply and the battery pack, and determines whether the power supply in the undervoltage state can be recharged, and controls the working state of the switching module according to the judgment result.

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