WO2019042353A1 - Système d'égalisation de batterie, véhicule, procédé d'égalisation de batterie, et support d'informations - Google Patents

Système d'égalisation de batterie, véhicule, procédé d'égalisation de batterie, et support d'informations Download PDF

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Publication number
WO2019042353A1
WO2019042353A1 PCT/CN2018/103246 CN2018103246W WO2019042353A1 WO 2019042353 A1 WO2019042353 A1 WO 2019042353A1 CN 2018103246 W CN2018103246 W CN 2018103246W WO 2019042353 A1 WO2019042353 A1 WO 2019042353A1
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WO
WIPO (PCT)
Prior art keywords
equalization
circuit
battery
turned
controller
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PCT/CN2018/103246
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English (en)
Chinese (zh)
Inventor
罗红斌
王超
沈晓峰
曾求勇
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比亚迪股份有限公司
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Publication of WO2019042353A1 publication Critical patent/WO2019042353A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present disclosure relates to the field of battery pack equalization, and in particular to a battery equalization system, a vehicle, a battery equalization method, and a storage medium.
  • battery packs are an important part of it. Since the battery pack is formed by connecting a plurality of single cells in series, the difference between the cells in the battery pack gradually increases with the use of the battery, resulting in poor consistency between the battery cells. Due to the short board effect of the battery, the battery pack capacity cannot be fully utilized, resulting in a decrease in the overall capacity of the battery pack. Therefore, effective balancing management of the battery pack of the electric vehicle is beneficial to improving the consistency of each unit battery in the battery pack, reducing the capacity loss of the battery, prolonging the service life of the battery and the driving range of the electric vehicle. significance.
  • the battery equalization system generally includes: a battery management controller and a plurality of battery information collectors, wherein each battery information collector includes three modules: a control unit, a battery sampling circuit, and a battery equalization circuit. And the battery sampling circuit and the battery equalization circuit respectively apply different channels. Each cell of the battery pack is provided with a battery detection circuit channel and a battery equalization circuit channel.
  • the workflow is as follows: the battery sampling circuit is responsible for real-time sampling of the battery voltage information, the control unit of the battery information collector sends battery sampling information to the battery management controller, and the battery management controller determines whether it is necessary to turn on the equalization, and then to the battery information collector. The control unit sends an equalization command, and the control unit of the battery information collector controls the battery equalization circuit to turn on the equalization.
  • An object of the present disclosure is to provide a battery equalization system, a vehicle, a battery equalization method, and a storage medium for solving the technical problem of high hardware cost of the battery equalization system in the related art.
  • the present disclosure provides a battery equalization system including an acquisition circuit, an equalization circuit, and a controller; wherein the controller passes through a control channel and an acquisition circuit and an equalization circuit corresponding to the same single cell in the battery pack. Connecting, the collecting circuit and the equalizing circuit time-multiplexing the control channel;
  • the collecting circuit is configured to collect parameter information of the single battery in the battery group; when the collecting circuit needs to collect parameter information of the single battery in the battery group, the equalizing circuit is in an on state;
  • the equalization circuit is configured to perform equalization processing on the single cells in the battery pack; when the equalization circuit needs to perform equalization processing on the single cells in the battery pack, the acquisition circuit is in a short circuit state;
  • the controller is configured to control the equalization circuit to perform equalization processing on the single-cell that needs to be turned on when determining that a single battery in the battery pack needs to be turned on according to parameter information of the battery pack.
  • the equalization circuit is respectively connected to the corresponding single cell through the first equalization branch and the second equalization branch, and one ends of the first equalization branch and the second equalization branch are respectively connected to the Two poles of the single battery; the first equalizing branch and the other end of the second equalizing branch are connected between the collecting circuit and the equalizing circuit;
  • the first equalizing branch is disconnected and the second equalizing branch is turned on;
  • the equalization circuit needs to perform equalization processing on the single cells in the battery pack, the first equalization branch and the second equalization branch corresponding to the single battery are turned on.
  • the second equalization branch is maintained in an on state, and the first equalization branch is provided with a first switch; when the collection circuit needs to collect parameter information of a single battery in the battery group, the A switch is turned off; when the equalization circuit performs equalization processing on the single cell that needs to be turned on, the first switch of the first equalization branch corresponding to the single cell is closed.
  • the controller is further configured to control, according to the target equalization duration and the equalization duty ratio of the unit that needs to be turned on by the parameter information of the battery pack, to control the equalization circuit to open the required
  • the equalized single cell performs equalization processing, and the equalization duty ratio is a ratio of a duration occupied by the equalization circuit occupying the control channel to a total duration occupied by the control channel.
  • the controller is further configured to determine an equalization period and an acquisition period according to the target equalization duration and the equalization duty ratio, where the sum of the equalization period and the collection period is equal to the control
  • the control channel is connected to the acquisition circuit, so that the acquisition circuit collects parameter information of the battery pack.
  • the controller is configured to obtain, by using the following manner, a target equalization duration of the single battery that needs to be turned on:
  • the target equalization time of the single battery that needs to be turned on is calculated according to the parameter information of the battery.
  • the collecting circuit of the single battery is connected to the controller through the corresponding control channel.
  • the controller is further configured to control the equalization circuit to discharge the single battery when a difference between a cell voltage and a minimum voltage in each of the cells is greater than a preset voltage difference threshold.
  • the controller is further configured to control the equalization circuit to charge the single battery when a difference between a voltage of the single battery and a maximum voltage in each of the single cells is greater than a preset voltage difference threshold.
  • the controller includes a control chip, and the control chip is connected to an acquisition module and an equalization module corresponding to the same single cell through a pin, and the pin passes through the control channel and the equalization circuit and The acquisition circuit is connected.
  • the equalization circuit includes an equalization resistor in parallel with the single cell.
  • the present disclosure also provides a vehicle including the battery equalization system described above.
  • the present disclosure also provides a battery equalization method for a battery equalization system, the battery equalization system including a controller, an acquisition circuit, and an equalization circuit; wherein the controller passes through a control channel and corresponds to the same single in the battery pack
  • the acquisition circuit of the body battery is connected to the equalization circuit, and the acquisition circuit and the equalization circuit time-multiplex the control channel;
  • the method includes:
  • the equalization circuit is controlled by the controller to perform equalization processing on the single battery that needs to be turned on.
  • the equalization circuit is respectively connected to the corresponding single cell through the first equalization branch and the second equalization branch, and one ends of the first equalization branch and the second equalization branch are respectively connected to the Two poles of the single battery; the first equalizing branch and the other end of the second equalizing branch are connected between the collecting circuit and the equalizing circuit;
  • the controlling the equalization circuit is in an on state, including:
  • the controlling the acquisition circuit is in a short circuit state, including:
  • the first equalization branch and the second equalization branch corresponding to the single battery are turned on.
  • the determining, by the controller, that the single battery in the battery pack needs to be turned on according to the parameter information of the battery group includes:
  • the controller Determining, by the controller, the target equalization time and the equalization duty ratio of the single cell that needs to be turned on, the cell that needs to be turned on, and the equalization duty according to the parameter information of the battery.
  • the controller controlling, by the controller, the equalization circuit to perform equalization processing on the single-cell that needs to be turned on, including:
  • the equalization circuit controls the equalization circuit to perform equalization processing on the unit cells that need to be turned on by the controller according to the target equalization duration and the equalization duty ratio of the unit cells that are required to be turned on.
  • the method further includes:
  • the connecting the control channel to the acquisition circuit includes:
  • the equalizing circuit corresponding to the single-cell battery that needs to be turned on and equalized by the control channel includes:
  • control channel is connected to the equalization circuit corresponding to the single cell that needs to be turned on.
  • the determining, according to the parameter information of the battery group, the target equalization duration of the single-cell that needs to be turned on including:
  • the target equalization time of the single cell that needs to be turned on is calculated.
  • the method further includes:
  • the acquisition circuit of the single cell is connected to the controller through the corresponding control channel.
  • controlling, by the controller, the equalization circuit to perform equalization processing on the single-cell that needs to be turned on including:
  • the equalization circuit is controlled by the controller to perform equalization discharge on the unit cells that need to be turned on.
  • controlling, by the controller, the equalization circuit to perform equalization processing on the single-cell that needs to be turned on including:
  • the equalization circuit is controlled by the controller to perform equalization charging on the single battery that needs to be turned on.
  • the present disclosure also provides a computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the battery equalization method described above.
  • the controller in the present disclosure and the voltage sampling circuit and the equalization circuit of each unit cell are time-multiplexed one channel, the number of channels of the controller is reduced, thereby reducing the hardware cost; and due to battery sampling and equalization Separate, the equalization current does not affect the battery voltage, which improves the accuracy of the battery voltage sampling.
  • FIG. 1 is a block diagram of a battery equalization system, according to an exemplary embodiment.
  • FIG. 2 is a schematic diagram of an equalization circuit of a battery equalization system according to an exemplary embodiment.
  • FIG. 3 is another block diagram of a battery equalization system, according to an exemplary embodiment.
  • FIG. 4 is a flow chart showing a battery equalization method according to an exemplary embodiment.
  • FIG. 5 is another flow chart of a battery equalization method according to an exemplary embodiment.
  • FIG. 6 is a flowchart of determining, in a step included in a battery equalization method, a unit cell that needs to turn on equalization and a target equalization duration thereof, according to an exemplary embodiment.
  • FIG. 7 is another flow chart of a battery equalization method according to an exemplary embodiment.
  • FIG. 8 is another flow chart of a battery equalization method according to an exemplary embodiment.
  • FIG. 1 is a block diagram of a battery equalization system, according to an exemplary embodiment.
  • the battery equalization system includes an acquisition circuit 12 , an equalization circuit 13 , and a controller 14 , wherein the battery 11 is formed by connecting a plurality of single cells 111 in series.
  • the controller 14 is connected to an acquisition circuit 12 and an equalization circuit 13 corresponding to the same single cell 111 through a control channel 140.
  • the acquisition circuit 12 and the equalization circuit 13 time-multiplex the control channels. 140.
  • the controller 14 includes a control chip connected to the acquisition circuit 12 and the equalization circuit 13 corresponding to the same single cell 111 through a pin, and the pin passes through the control channel 140 and the equalization circuit. 13 is connected to the acquisition circuit 12.
  • the present disclosure corresponds to a control circuit 140 of the same unit cell 111 and the equalization circuit 13 sharing a control channel 140 of the controller 14, such that the number of channels required for the controller 14 is reduced, thereby reducing the number of channels required for the controller 14.
  • the N single cells correspond to 2N control channels.
  • the acquisition circuit and the equalization circuit of the same single battery share the control channel and the controller, and the N single cells correspond to N control channels, thereby reducing the number of control channels and reducing the cost of the controller.
  • the N single cells correspond to 2N control channels, and 2N control channels need to be controlled.
  • the acquisition circuit and the equalization circuit of the same single battery share the control channel of the controller, so that the N single cells correspond to the N control channels, and only the N control channels need to be controlled, which simplifies the control flow and reduces The misoperation rate of the controller.
  • the N single cells correspond to 2N control channels, and the pass rate of the controller through the control channel is qualified by 2N control channels.
  • the acquisition circuit and the equalization circuit of the same single battery share a control channel of the controller, and the N single cells correspond to N control channels, and the pass rate of the controller through the control channel is determined by the pass rate of the N control channels. In this way, the total pass rate of the plurality of single cells in the whole system through the control channel to the controller can be improved, thereby improving the pass rate of the battery equalization system.
  • the control channel or channel refers to a transmission path of a control command of the control module to the execution end (acquisition module and equalization module).
  • the collecting circuit 12 is configured to collect parameter information of the single battery 111 in the battery pack 11 , and send the collected parameter information of the battery pack to the controller 14 , the battery pack 11 .
  • the unit cells 111 in the one-to-one correspondence with the acquisition circuit 12.
  • the parameter information includes information such as a battery voltage and a temperature.
  • the controller 14 controls the acquisition circuit 12 to collect parameter information of the battery pack 11 by connecting the control channel 140 to the acquisition circuit 12.
  • the equalization circuit 13 is in an on state.
  • the equalizing circuit 13 when the collecting circuit 12 collects the parameter information of the battery pack 11, the equalizing circuit 13 is in the conducting state, and does not mean that the equalizing circuit 13 performs equalization processing on the single battery, but refers to the collecting circuit 12 and When the unit cells 111 are connected, the equalization circuit 13 corresponding to the unit cells 111 corresponds to a part of the acquisition circuit 12.
  • the equalization circuit 13 may be an equalization resistor 130 including a parallel connection to the unit cell 111.
  • FIG. 3 is another block diagram of a battery equalization system, which is controlled by the controller 14 to collect the battery pack 11 in accordance with an exemplary embodiment.
  • the branch where the collecting circuit 12 is located is in an on state
  • the second equalizing branch 132 where the equalizing circuit 13 is located may also be in an on state
  • the first equalizing branch 131 is in a state of being Disconnected state.
  • the collecting circuit 12 and the equalizing resistor 130 are connected in series in a branch, and both ends of the branch are respectively connected to two stages of the single cell 111, that is, when the collecting circuit 12 is connected to the single cell 111.
  • the equalization resistor 130 included in the equalization circuit 13 can be used as part of the acquisition circuit 12.
  • the equalization circuit 13 is connected to the corresponding single cell 111 through the first equalization branch 131 and the second equalization branch 132, respectively, and the second equalization branch 132 and the first equalization branch One end of the path 131 is connected to the two poles of the single cell 111, and the other end of the first equalization branch 131 and the second equalization branch 132 is connected between the collecting circuit 12 and the equalizing circuit 13.
  • the first equalization branch 131 is connected to the anode of the unit cell 111
  • the second equalization branch 132 is connected to the cathode of the unit cell 111.
  • the controller 14 can control the first equalization branch 131 to be disconnected, and control the equalization.
  • the second equalizing branch 132 where the circuit 13 is located and the branch where the collecting circuit 12 is located are turned on. At this time, the equalizing circuit 13 can be in a conducting state together with the branch where the collecting circuit 12 is located.
  • the equalization circuit 13 is configured to perform equalization processing on the single cells 111 in the battery pack 11 , and the single cells 111 in the battery pack 11 are in one-to-one correspondence with the equalization circuit 13 .
  • the controller 14 controls the equalization circuit 13 to the unit that needs to be equalized by connecting the control channel 140 to the equalization circuit 13.
  • the battery 111 performs equalization processing.
  • the controller 14 may control the first equalization branch 131 and the second equalization branch 132 to be turned on. Further, the equalization circuit 13 is in an on state, and the acquisition circuit 12 is in a short circuit state.
  • the collecting circuit 12 corresponding to the single cell 111 is connected to the controller 14 through a corresponding control channel 140. That is, when the controller 14 determines that the unit cell 111 ends the equalization, the controller 14 disconnects the equalization circuit 13 corresponding to the unit cell 111 from the control channel 140, and controls the corresponding collection of the unit cell 111. Circuit 12 is in communication with control channel 140.
  • the controller 14 is connected to the acquisition circuit 12 and the equalization circuit 13.
  • the controller 14 is configured to receive parameter information of the battery pack 11 when the control channel 140 is communicated with the acquisition circuit 12.
  • the controller 14 connects the control channel 140 to the equalization circuit when determining, according to the parameter information of the battery pack 11, that there is a unit cell 111 in the multi-cell unit 111 that needs to be equalized.
  • the equalization circuit 13 performs equalization processing on the unit cell 111.
  • the equalization circuit 13 may be an equalization processing method for discharging the unit cells 111 that need to be equalized. For example, in FIG. 2 and FIG. 3, the two ends of the unit cells 111 that need to be balanced are connected in parallel. An equalization resistor 130.
  • the equalization circuit 13 may also be an equalization processing method for charging the single-cell battery 111 that needs to be equalized. For example, the unit cell 111 that needs to be balanced is connected to a generator or a battery of the vehicle, and then passes through the The generator or the battery charges the unit cell 111 that needs to be equalized.
  • the controller 14 may further control, according to the target equalization duration of the unit battery 111 that needs to be turned on, determined by the parameter information of the battery pack 11, to control the equalization circuit 13 to open the equalization.
  • the unit cell 111 is subjected to equalization processing.
  • the controller 14 can obtain the target equalization duration of the unit cell 111 that needs to be turned on by the following method: determining the battery pack 11 according to the parameter information of the battery pack 11 collected by the acquisition circuit 12 Whether the single battery 111 needs to be turned on and equalized; when it is determined that the single battery 111 needs to be turned on in the battery pack 11, the target of the unit cell 111 that needs to be turned on is calculated according to the parameter information of the battery pack 11. Equilibrium duration.
  • the controller 14 can be determined by the following manner.
  • the unit cell 111 that needs to be turned on is balanced:
  • the minimum voltage value among the voltage values of the single cells 111 in the battery pack 11 is used as a reference voltage value.
  • the unit cell 111 having a voltage difference greater than or equal to the preset voltage difference threshold is determined as It is described that the balanced unit cell 111 needs to be turned on.
  • the single-cell battery that needs to be turned on can be determined by other parameter information of the battery pack.
  • the battery equalization system adopts an active equalization method to equalize the single-cell battery, that is, When the unit cells that need to be turned on are charged, the maximum voltage value among the voltage values of the individual cells in the battery pack is used as a reference voltage value.
  • the minimum voltage value among the voltage values of the individual cells 111 of the battery pack 11 may be used as the reference voltage value, and the preset voltage difference threshold may be 5 mV (or other value).
  • the controller 14 connects the control channel 140 to the acquisition circuit 12, thereby controlling the acquisition circuit 12 to collect the voltage values of the individual cells 111 of the battery pack 11; meanwhile, the controller 14 controls the The first equalization branch 131 is turned off.
  • the controller 14 compares the minimum voltage value Vmin in each of the single cells 111, and determines whether the difference between the voltage value of each of the single cells 111 of the battery pack 11 and Vmin is less than 5 mV. If so, the battery pack 11 has a good uniformity and does not need to be equalized; if it is greater than 5 mV, the single-cell battery 111 having a difference from Vmin of more than 5 mV is used as the single-cell battery 111 that needs to be turned on.
  • the controller 14 connects the control channel 140 to the equalization circuit 13, and at the same time, the controller 14 can control the first equalization branch 131 and the second equalization branch 132 to be turned on. Further, the controller 14 controls the equalization circuit 13 to discharge the unit cell 111 that needs to be turned on according to the target equalization duration of the unit cell 111 that needs to be turned on.
  • the controller 14 counts the discharge duration of the equalization circuit 13 for the unit cell 111 that needs to be turned on, and the difference between the discharge duration of the unit cell 111 and the target equalization period. When the value is within the threshold range, the discharge is stopped and the equalization ends. The controller 14 disconnects the equalization circuit 13 corresponding to the unit cell 111 from the control channel 140, and controls the acquisition circuit 12 corresponding to the unit cell 111 to communicate with the control channel 140.
  • the controller in the present disclosure and the voltage sampling circuit and the equalization circuit of each unit cell are time-multiplexed one channel, the number of channels of the controller is reduced, thereby reducing the hardware cost; and due to battery sampling and equalization Separate, the equalization current does not affect the battery voltage, which improves the accuracy of the battery voltage sampling.
  • the second equalization branch 132 can be kept in an on state, and the first equalization branch 131 is provided with a first switch K1 .
  • the first switch K1 is controlled by the controller 14.
  • the first switch K1 may be a relay switch, and the controller 14 controls the first switch K1 to be in an open state or a closed state by outputting a control signal.
  • the controller 14 controls the first switch K1 to be turned off.
  • the controller 14 controls the first switch K1 on the first equalization branch 131 corresponding to the unit cell 111 to be closed.
  • the controller 14 may further control, according to the target equalization duration and the equalization duty ratio, the equalization circuit 13 to perform equalization processing on the single-cell battery 111 that needs to be turned on.
  • the equalization duty ratio is a ratio of the duration of the equalization circuit 13 occupying the control channel 140 to the total duration occupied by the control channel 140; wherein the total duration occupied by the control channel 140 includes the equalization circuit 13 consuming the length of the control channel 140 and the duration of the acquisition circuit 12 occupying the control channel 140.
  • the controller 14 connects the control channel 140 to the acquisition circuit 12, and further controls the acquisition circuit 12 to collect parameter information of the battery pack 11; meanwhile, the controller 14 controls The first switch K1 is turned off.
  • the controller 14 obtains the single-cell battery 111 that needs to be turned on and balanced when it is determined that the single-cell battery 111 needs to be turned on in the battery pack 11 according to the parameter information of the single-cell battery 111 in the battery pack 11.
  • the target equalization duration and the equalization duty ratio, and the control channel 140 is connected to the equalization circuit 13 corresponding to the unit cell 111 that needs to be turned on. Meanwhile, the controller 14 can control the first switch. K1 is closed.
  • the controller 14 controls the equalization circuit 13 to perform equalization processing on the unit cells 111 that need to be turned on, according to the target equalization duration and the equalization duty ratio of the unit cells 111 that need to be turned on.
  • the controller 14 determines an equalization period and an acquisition period according to the target equalization duration and the equalization duty, and the sum of the equalization period and the acquisition period is equal to the control channel 140.
  • the controller 14 controls the control channel 140 to communicate with the acquisition circuit 12 to enable the acquisition circuit 12 to collect parameter information of the battery pack 11 at the same time.
  • the controller 14 controls the first switch K1 to be turned off; during the equalization period, the controller 14 controls the control channel 140 to communicate with an equalization circuit 13 that needs to perform equalization processing, and the controller 14 can control The first switch K1 is closed, so that the equalization circuit 13 performs equalization processing on the unit cells 111 in the battery pack 11 that need to be equalized.
  • the disclosure provides a first switch on the first equalization branch, and when the parameter information of the battery pack needs to be collected, the control channel is connected to the acquisition circuit, the first switch is turned off; and when the balance is needed, the control channel is controlled. Connected to the equalization circuit, the first switch is closed, and a control channel is realized by time division multiplexing, which reduces the number of channels required for the controller, thereby reducing the hardware cost; and because the battery sampling and equalization are separately performed, the equalization current is not Will affect the battery voltage, which improves the accuracy of battery voltage sampling.
  • a control switch may be disposed on the control channel 140.
  • the controller 14 controls the control switch to be connected to the collecting circuit 12 to connect the control channel 140.
  • the controller 14 controls the control switch to be connected to the equalization circuit 13 So that the control channel 140 is connected to the equalization circuit 13.
  • the present disclosure provides a control switch between the controller and the acquisition circuit and the equalization circuit.
  • the controller can adjust the state of the switch to achieve the function of acquisition and equalization, and can achieve no sampling during equalization, and is unbalanced during sampling.
  • the effect of equalizing the current does not affect the battery voltage, thereby improving the accuracy of the battery voltage sampling.
  • each single cell corresponds to two control channels, and each control channel corresponds to one pin of the control chip, that is, N single cells. Corresponds to 2N pins.
  • the acquisition circuit and the equalization circuit of the same single battery share the control channel and the controller, and one control channel corresponds to one pin, that is, N single cells correspond to N control channels, corresponding to N pins, so that Reducing the need for control chip pins, based on the prior art, can reduce the number of pins by half, effectively reducing the cost of the control chip.
  • the controller includes a first control unit disposed in the battery information collector and a second control unit disposed in the battery management controller.
  • the collecting circuit sends the parameter information of the single battery in the collected battery group to the second control unit by using the first control unit; wherein the acquisition circuit and the equalization circuit of the same single battery correspond to the first A connection channel of a control unit.
  • the first control unit may be connected to the acquisition circuit by controlling the connection channel, thereby controlling the collection circuit to collect parameter information of the single battery in the battery group.
  • the second control unit may also send an acquisition instruction to the first control unit through the communication unit to control the connection channel to be connected to the acquisition circuit by the first control unit.
  • the first control unit may be connected to the equalization circuit by controlling the connection channel, thereby controlling the equalization circuit to perform equalization processing on the single battery that needs to be turned on and equalized.
  • the first control unit may send parameter information of the battery pack collected by the acquisition circuit to the second control unit, and the second control unit determines, according to parameter information of the battery pack, a single battery that needs to be turned on, and And transmitting, by the communication unit, an equalization instruction to the first control unit, to control, by the first control unit, the connection channel to be connected to the equalization circuit.
  • the acquisition circuit in the battery equalization system sends the parameter information of the single battery in the collected battery pack to the second control unit through the first control unit
  • the acquisition circuit and the equalization circuit of the same single battery correspond to the first control unit.
  • a connection channel reduces the number of channels required by the first control unit.
  • the first control unit of the battery information collector and the second control unit of the battery management controller can selectively perform equalization control on the unit cells that need to be equalized. That is, the first control unit may control the equalization circuit to perform equalization processing on the single cells that need to be equalized, and the second control unit may also control the equalization circuit to perform equalization processing on the single cells that need to be equalized.
  • the first control unit or the second control unit determines the unit cells that need to be equalized according to the parameter information of the battery pack collected by the acquisition circuit.
  • the first control unit receives the parameter information of the battery pack, and determines according to the parameter information of the battery group.
  • the control equalization circuit performs equalization processing on the single battery that needs to be turned on.
  • the first control unit receives parameter information of the battery pack, and determines, according to parameter information of the battery pack, When a single battery in the battery pack needs to be turned on, the control equalization circuit performs equalization processing on the single battery that needs to be turned on.
  • the first control unit receives the parameter information of the battery group, and determines, according to the parameter information of the battery group, that the battery group has a single
  • the control equalization circuit equalizes the single cells that need to be turned on.
  • the battery information collector and the battery management controller can selectively control the equalization system through the first control unit and the second control unit, respectively, so that one of the battery information collector and the battery management controller can be disabled or malfunctioned. In this case, the normal operation of the battery equalization system is still guaranteed.
  • the present disclosure also provides a vehicle including the battery equalization system described above.
  • the battery equalization system included in the vehicle is described in detail in the embodiment of the above battery equalization system, and will not be described in detail herein.
  • FIG. 4 is a flow chart showing a battery equalization method according to an exemplary embodiment.
  • the battery equalization method is applied to a battery equalization system, where the battery equalization system includes a controller, an acquisition circuit, and an equalization circuit; wherein the controller passes through a control channel and corresponds to the same single in the battery pack.
  • the acquisition circuit of the body battery is connected to the equalization circuit, and the acquisition circuit and the equalization circuit time-multiplex the control channel; the method comprises the following steps.
  • Step S21 the control channel is connected to the acquisition circuit, and the equalization circuit is controlled to be in an on state.
  • Step S22 collecting parameter information of the single battery in the battery group by using the collecting circuit.
  • Step S23 the controller determines, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on.
  • Step S24 the control channel is connected to the equalization circuit corresponding to the unit cell that needs to be turned on, and the acquisition circuit is controlled to be in a short circuit state.
  • step S25 the equalizing circuit is controlled by the controller to perform equalization processing on the single battery that needs to be turned on.
  • FIG. 5 is another flow chart of a battery equalization method according to an exemplary embodiment.
  • the equalization circuit is respectively connected to the corresponding single cell through the first equalization branch and the second equalization branch, and one ends of the first equalization branch and the second equalization branch are respectively connected.
  • the two ends of the single cell; the first equalizing branch and the other end of the second equalizing branch are connected between the collecting circuit and the equalizing circuit; the method comprises the following steps.
  • Step S31 the control channel is connected to the acquisition circuit, the first equalization branch is disconnected, and the second equalization branch is turned on.
  • Step S32 collecting parameter information of the single battery in the battery group by using the collecting circuit.
  • Step S33 the controller determines, according to the parameter information of the battery pack, a target equalization time and an equalization duty ratio of the single-cell that needs to be turned on, and the unit that needs to be turned on, and the balance is occupied.
  • the air ratio is the ratio of the duration that the equalization circuit occupies the control channel to the total duration that the control channel is occupied.
  • Step S34 the control channel is connected to the equalization circuit corresponding to the unit cell that needs to be turned on, and the first equalization branch and the second equalization branch corresponding to the unit cell are turned on.
  • Step S35 The equalization circuit controls the equalization circuit to perform equalization processing on the single-cell that needs to be turned on by the controller according to the target equalization duration and the equalization duty ratio of the unit cell that needs to be turned on.
  • the determining, according to the parameter information of the battery group, the target equalization duration of the single-cell that needs to be turned on including:
  • Step S331 the controller determines, according to the collected parameter information of the battery pack, whether a single battery needs to be turned on in the battery pack;
  • Step S332 when it is determined that a single battery in the battery pack needs to be turned on, the controller calculates a target equalization time length of the single battery that needs to be turned on according to parameter information of the battery pack.
  • the method further includes: determining, by the controller, an equalization period and an acquisition period according to the target equalization duration and the equalization duty ratio, where the sum of the equalization period and the collection period is equal to The total length of time that the control channel is occupied;
  • the connecting the control channel to the collecting circuit includes: connecting the control channel to the collecting circuit during the collecting period;
  • the equalizing circuit corresponding to the single-cell battery that needs to be turned on and equalized by the control channel includes: in the equalizing period, the control channel is connected to the equalization corresponding to the single-cell battery that needs to be turned on and equalized Circuit.
  • FIG. 7 is another flow chart of a battery equalization method according to an exemplary embodiment. As shown in Figure 7, the method includes the following steps.
  • Step S51 the control channel is connected to the acquisition circuit, the first equalization branch is disconnected, and the second equalization branch is turned on.
  • Step S52 collecting parameter information of the single battery in the battery pack through the collecting circuit.
  • Step S53 determining, by the controller, that a single battery in the battery pack needs to be turned on according to parameter information of the battery pack.
  • Step S54 the control channel is connected to the equalization circuit corresponding to the unit cell that needs to be turned on, and the first equalization branch and the second equalization branch corresponding to the unit cell are turned on.
  • Step S55 the equalizing circuit is controlled by the controller to discharge the single cell that needs to be turned on.
  • Step S56 when the single cells in the battery pack do not need to be equalized, the collecting circuit of the single cells is connected to the controller through the corresponding control channel.
  • FIG. 8 is another flow chart of a battery equalization method according to an exemplary embodiment. As shown in Figure 8, the method includes the following steps.
  • Step S61 the control channel is connected to the acquisition circuit, the first equalization branch is disconnected, and the second equalization branch is turned on.
  • Step S62 collecting parameter information of the single battery in the battery pack through the collecting circuit.
  • Step S63 the controller determines, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on.
  • Step S64 the control channel is connected to the equalization circuit corresponding to the unit cell that needs to be turned on, and the first equalization branch and the second equalization branch corresponding to the single battery are turned on.
  • Step S65 the equalizing circuit is controlled by the controller to charge the single battery that needs to be turned on.
  • Step S66 when the single cells in the battery pack do not need to be equalized, the collecting circuit of the single cells is connected to the controller through the corresponding control channel.
  • the present disclosure also provides a computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the battery equalization method described above.

Abstract

L'invention concerne un système d'égalisation de batterie comprenant des circuits d'acquisition (12), des circuits d'égalisation (13) et des dispositifs de commande (14). Chaque dispositif de commande (14) est connecté, au moyen d'un canal de commande (140), au circuit d'acquisition (12) et au circuit d'égalisation (13) correspondant à la même cellule dans un bloc-batterie, et le canal de commande (140) est multiplexé par le circuit d'acquisition (12) et le circuit d'égalisation (13) dans le temps ; lorsque les circuits d'acquisition (12) doivent acquérir des informations de paramètre des cellules dans le bloc-batterie, les circuits d'égalisation (13) sont dans un état de MARCHE ; lorsque les circuits d'égalisation (13) doivent égaliser les cellules dans le bloc-batterie, les circuits d'acquisition (12) sont dans un état de court-circuit. Un canal est multiplexé par le dispositif de commande (14) et le circuit d'échantillonnage de tension et le circuit d'égalisation de chaque cellule dans le temps de manière à réduire les exigences concernant le nombre de canaux du dispositif de commande, ce qui permet de réduire les coûts matériels ; en outre, étant donné que l'échantillonnage et l'égalisation de batterie sont réalisés séparément, un courant d'égalisation n'affecte pas une tension de batterie, ce qui permet d'améliorer la précision d'échantillonnage de tension de batterie. L'invention concerne également un véhicule, un procédé d'égalisation de batterie et un support d'informations.
PCT/CN2018/103246 2017-08-31 2018-08-30 Système d'égalisation de batterie, véhicule, procédé d'égalisation de batterie, et support d'informations WO2019042353A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113054330A (zh) * 2019-12-26 2021-06-29 比亚迪股份有限公司 电池模组和具有其的动力电池包、电动汽车
CN117595466A (zh) * 2024-01-18 2024-02-23 杭州高特电子设备股份有限公司 一种双重冗余采集监控的电池主动均衡系统和控制方法
CN117595466B (zh) * 2024-01-18 2024-05-14 杭州高特电子设备股份有限公司 一种双重冗余采集监控的电池主动均衡系统和控制方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111540965B (zh) * 2020-05-18 2021-10-08 上海采日能源科技有限公司 电池电压均衡方法、装置及电池管理系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002008732A (ja) * 2000-06-27 2002-01-11 Denso Corp 電気自動車用組電池の電圧補正装置
EP2744067A1 (fr) * 2011-08-11 2014-06-18 Panasonic Corporation Circuit d'équilibrage, système d'alimentation électrique et véhicule
CN106848464A (zh) * 2016-12-29 2017-06-13 东莞钜威动力技术有限公司 一种电池均衡估算法和电池管理系统
CN107097668A (zh) * 2017-05-03 2017-08-29 东莞钜威动力技术有限公司 电动汽车的被动均衡电路及其均衡方法和失效检测方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102496979A (zh) * 2011-11-28 2012-06-13 上海交通大学 一种极性自动切换的锂离子电池组均衡电路
CN103326417B (zh) * 2013-05-07 2015-06-17 国家电网公司 一种电池组充放电均衡控制电路
JP2015065795A (ja) * 2013-09-26 2015-04-09 ソニー株式会社 蓄電装置、蓄電制御装置および蓄電制御方法
CN104953194B (zh) * 2014-03-31 2017-08-22 比亚迪股份有限公司 电池均衡控制装置及具有其的电动车和电池均衡控制方法
DE102014208543A1 (de) * 2014-05-07 2015-11-12 Robert Bosch Gmbh Batteriezelleinrichtung mit einer Batteriezelle und einer Überwachungselektronik zum Überwachen der Batteriezelle und entsprechendes Verfahren zum Betreiben und Überwachen einer Batteriezelle
US10153651B2 (en) * 2014-10-13 2018-12-11 24M Technologies, Inc. Systems and methods for series battery charging
JP6107836B2 (ja) * 2015-01-07 2017-04-05 トヨタ自動車株式会社 電池監視装置
CN105789715A (zh) * 2016-02-25 2016-07-20 上海大学 一种共用开关阵列的电池采样均衡电路
CN205453231U (zh) * 2016-03-22 2016-08-10 华北电力大学（保定） 一种基于can总线的电动汽车充电控制系统
CN205960720U (zh) * 2016-08-18 2017-02-15 郑州宇通客车股份有限公司 一种充电保护电路及使用该电路的蓄电池系统和机动车
CN106329667A (zh) * 2016-10-26 2017-01-11 宁德时代新能源科技股份有限公司 电池均衡电路、系统及方法
CN106549454A (zh) * 2016-12-15 2017-03-29 深圳晶福源科技股份有限公司 一种电压采样与电量均衡共线的电池管理系统和管理方法
CN106786909B (zh) * 2016-12-27 2019-08-13 华中科技大学 一种储能液态金属电池的成组均衡控制装置及控制方法
CN106786922B (zh) * 2016-12-29 2020-02-14 东莞钜威动力技术有限公司 一种电池管理系统的被动均衡电路和方法
CN106786944B (zh) * 2016-12-31 2020-12-18 华为技术有限公司 一种串联电池组单体电池的采样电路、均衡电路及系统
CN106981901A (zh) * 2017-05-15 2017-07-25 欣旺达电子股份有限公司 电池组的电量均衡方法及系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002008732A (ja) * 2000-06-27 2002-01-11 Denso Corp 電気自動車用組電池の電圧補正装置
EP2744067A1 (fr) * 2011-08-11 2014-06-18 Panasonic Corporation Circuit d'équilibrage, système d'alimentation électrique et véhicule
CN106848464A (zh) * 2016-12-29 2017-06-13 东莞钜威动力技术有限公司 一种电池均衡估算法和电池管理系统
CN107097668A (zh) * 2017-05-03 2017-08-29 东莞钜威动力技术有限公司 电动汽车的被动均衡电路及其均衡方法和失效检测方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113054330A (zh) * 2019-12-26 2021-06-29 比亚迪股份有限公司 电池模组和具有其的动力电池包、电动汽车
CN117595466A (zh) * 2024-01-18 2024-02-23 杭州高特电子设备股份有限公司 一种双重冗余采集监控的电池主动均衡系统和控制方法
CN117595466B (zh) * 2024-01-18 2024-05-14 杭州高特电子设备股份有限公司 一种双重冗余采集监控的电池主动均衡系统和控制方法

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