CN112339613A - Battery pack management device and management method and electric vehicle - Google Patents

Battery pack management device and management method and electric vehicle Download PDF

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Publication number
CN112339613A
CN112339613A CN202011107782.0A CN202011107782A CN112339613A CN 112339613 A CN112339613 A CN 112339613A CN 202011107782 A CN202011107782 A CN 202011107782A CN 112339613 A CN112339613 A CN 112339613A
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China
Prior art keywords
battery
electric quantity
power supply
supply branch
battery pack
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Granted
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CN202011107782.0A
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Chinese (zh)
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CN112339613B (en
Inventor
赵鹏
韦群力
薛嘉甫
丁志正
陈辉
王超群
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Globe Jiangsu Co Ltd
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Globe Jiangsu Co Ltd
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Priority to CN202011107782.0A priority Critical patent/CN112339613B/en
Priority to CN202111366635.XA priority patent/CN114084043B/en
Publication of CN112339613A publication Critical patent/CN112339613A/en
Priority to CA3173514A priority patent/CA3173514A1/en
Priority to MX2022011930A priority patent/MX2022011930A/en
Priority to AU2021244766A priority patent/AU2021244766A1/en
Priority to EP21777114.6A priority patent/EP4131708A4/en
Priority to PCT/CN2021/083071 priority patent/WO2021190612A1/en
Priority to US17/913,564 priority patent/US20230105559A1/en
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Publication of CN112339613B publication Critical patent/CN112339613B/en
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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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/006—Control or measuring arrangements
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
    • A01D69/02—Driving mechanisms or parts thereof for harvesters or mowers electric
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Environmental Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a battery pack management device, a management method and an electric vehicle, wherein the battery pack management device comprises at least two battery interfaces, and each battery interface and a battery pack connected with the battery interface form a power supply branch; the control assembly detects the electric quantity of the battery assembly corresponding to each power supply branch circuit; if the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery components is not less than N1The control component directly or indirectly controls the upper limit of the output current of each battery component to be the rated current I of the battery componentm(ii) a If electricityThe quantity is greater than a first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2The control component directly or indirectly controls the upper limit of the output current of each battery component to be k1*ImWherein Q is1>Q2，0<k1<1. Compared with the prior art, the battery pack management device can intelligently switch the working modes of the loads according to the electric quantity, the quantity and the like of the battery packs.

Description

Battery pack management device and management method and electric vehicle
Technical Field
The present invention relates to a battery pack management apparatus, a battery pack management method, and an electric vehicle having the battery pack management apparatus.
Background
The working mode of the existing mower is single, and the working mode cannot be intelligently switched according to the information such as the number of batteries, electric quantity, output current and the like, so that the battery pack is excessively placed, and the working efficiency of the whole mower is lowered.
In view of the above problems, it is desirable to provide a battery pack management apparatus to solve the above problems.
Disclosure of Invention
The invention aims to provide a battery pack management device which can intelligently switch the working modes of loads according to the electric quantity, the quantity and the like of battery packs, so that the working time of the loads is prolonged, the defect that the battery packs are excessively used is avoided, and the overall working efficiency of the loads is improved.
In order to achieve the above object, the present invention provides a battery pack management apparatus for controlling a plurality of dry battery packs to supply power to a load, comprising: each battery interface is used for connecting the battery component and forming a power supply branch circuit with the battery component connected with the battery interface; the control assembly detects the electric quantity of the battery assembly corresponding to each power supply branch circuit; if the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery components is not less than N1The control component directly or indirectly controlsLimiting the output current of each battery pack to the rated current I of the battery packm(ii) a If the electric quantity is larger than the first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2The control component directly or indirectly controls the upper limit of the output current of each battery component to be k1*ImWherein Q is1>Q2，0<k1<1。
As a further improvement of the present invention, the control component determines the priority level of each power supply branch according to the level of the electric quantity, and then controls the power supply branch with the highest priority level to supply power to the load; when the difference between the electric quantity of the currently working battery pack and the electric quantity of the battery pack of the power supply branch circuit corresponding to the next priority level is within a first electric quantity interval, the control assembly controls the power supply branch circuit corresponding to the next priority level to work and is connected with the currently working power supply branch circuit in parallel to supply power for the load.
As a further improvement of the present invention, the control component determines the priority level of each power supply branch according to the power percentage, and then controls the power supply branch with the highest priority level to supply power to the load; when the difference between the electric quantity percentage of the currently working battery pack and the electric quantity percentage of the battery pack of the power supply branch corresponding to the next priority level is within the first proportion interval, the control assembly controls the power supply branch corresponding to the next priority level to work and is connected with the currently working power supply branch in parallel to supply power to the load.
As a further improvement of the present invention, the control component determines the priority level of each power supply branch according to the voltage level, and then controls the power supply branch with the highest priority level to supply power to the load; when the voltage difference between the voltage of the currently working battery pack and the voltage of the battery pack of the power supply branch corresponding to the next priority level is in a first voltage interval, the control assembly controls the power supply branch corresponding to the next priority level to work and is connected with the currently working power supply branch in parallel to supply power to the load
As a further improvement of the invention, if the electric quantity is larger than the secondTwo electric quantity threshold Q2Less than N3The control component directly or indirectly controls the upper limit of the output current of each battery component to be k2*ImWherein, 0<k2<k1<1。
As a further improvement of the present invention, when the power supply branch is controlled to operate, the control assembly obtains internal information of the battery assembly and determines whether the battery assembly is abnormal; and if the battery assembly is abnormal, the control assembly controls the power supply branch corresponding to the battery assembly to stop working.
As a further improvement of the present invention, when the control component detects that the voltage of the battery component is greater than the overvoltage value or less than the undervoltage value, the control component controls the power supply branch corresponding to the battery component to stop working.
As a further improvement of the invention, the control component detects the current of each power supply branch; when the current of the power supply branch circuit is larger than the first current threshold value or smaller than the second current threshold value, the control component controls the power supply branch circuit to stop working.
As a further improvement of the present invention, the control module detects the number N of currently operating battery modules and the total current I output by all currently operating battery modules; if I>(N*Im+ Δ I), the control component controls the battery component to reduce current output; where Δ I is the current offset.
As a further improvement of the invention, when I>(N*Im+ Δ I) and exceeds a preset time threshold, the control assembly controls the battery assembly to reduce the current output.
As a further improvement of the invention, the power supply branch has a switching tube; when the current of the power supply branch exceeds the upper limit of the output current of the power supply branch, the control component reduces the current output of the power supply branch by controlling the duty ratio of the control signal of the switching tube.
As a further improvement of the invention, the control component detects the number N of the currently operated battery components and the total current output by all the currently operated battery componentsI; if I>(N*Im+ Δ I), the control component sends a current limit signal to the load, which operates in a low power state in accordance with the current limit signal.
The invention also provides a battery pack management method for controlling a plurality of battery packs to cooperatively work in parallel to supply power to a load, which comprises the following steps:
s1: detecting the electric quantity of the battery assembly corresponding to each power supply branch;
s2: judging whether the electric quantity is greater than a first electric quantity threshold value Q1Whether the number of battery modules is not less than N1(ii) a If yes, the control component directly or indirectly controls the upper limit of the output current of each battery component to be the rated current I of the battery componentm(ii) a Otherwise, jumping to step S3;
s3: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is not less than N2(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k1*Im(ii) a Wherein Q is1>Q2，0<k1<1。
As a further improvement of the present invention, the battery pack management method further includes step S4: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is less than N3(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k2*ImWherein, 0<k2<k1<1。
As a further improvement of the present invention, the battery pack management method further includes step S0: detecting whether the battery component corresponding to the power supply branch circuit is abnormal or not; and if the battery assembly is abnormal, closing the power supply branch corresponding to the battery assembly.
As a further improvement of the present invention, the step S1 further includes the following steps: s11: detecting the electric quantity of the battery assembly corresponding to each power supply branch; s12: determining the priority level of each power supply branch according to the electric quantity; s13: controlling the power supply branch with the highest priority level to supply power to the load; s14: and when the difference between the electric quantity of the currently working battery pack and the electric quantity of the battery pack of the power supply branch circuit corresponding to the next priority level is within a first electric quantity interval, controlling the power supply branch circuit corresponding to the next priority level to work, and connecting the power supply branch circuit with the currently working power supply branch circuit in parallel to supply power to the load.
The present invention also discloses an electric vehicle, including: a traveling mechanism; an operating mechanism; a control mechanism; if the dry battery component is available; the battery pack management device is used for controlling the battery pack to supply power to a load; the battery pack management apparatus includes: each battery interface is used for connecting the battery component and forming a power supply branch circuit with the battery component connected with the battery interface; the control assembly detects the electric quantity of the battery assembly corresponding to each power supply branch circuit; if the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery components is not less than N1Controlling the electric vehicle to be in a first state; if the electric quantity is larger than the first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2Controlling the electric vehicle to be in a second state; if the electric quantity is larger than the second electric quantity threshold value Q2Less than N2And the electric quantity is greater than a third electric quantity threshold value Q3Less than N3And if so, controlling the electric vehicle to be in a third state.
As a further improvement of the invention, when the electric quantity is greater than the first electric quantity threshold Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2The control component sends a current limiting signal to the control mechanism; the control mechanism controls the running mechanism and the operating mechanism to run at a medium speed, so that the output current of the battery pack is not more than an upper limit k1*Im。
As a further improvement of the invention, if the electric quantity is greater than a third electric quantity threshold Q3Less than N3The control component sends a current limiting signal to the controllerThe control mechanism controls the running mechanism and the operation mechanism to run at a low gear speed.
The invention has the beneficial effects that: the battery pack management device can intelligently switch the working modes of the loads according to the electric quantity, the quantity and the like of the battery packs, so that the working time of the loads is prolonged, the defect that the battery packs are excessively used is overcome, and the overall working efficiency of the loads is improved.
Drawings
Fig. 1 is a block diagram of a battery pack management apparatus according to the present invention.
Fig. 2 is a flow chart illustrating a battery pack management method according to the present invention.
Fig. 3 is a flowchart of step S1.
Fig. 4 is a flowchart illustrating step S1 of the second embodiment.
Fig. 5 is a flowchart illustrating step S1 of the third embodiment.
Fig. 6 is a schematic configuration diagram of an electric vehicle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present invention discloses a battery pack management apparatus 100 for controlling the battery packs 101 to work in parallel to supply power to a load 102. The battery pack management apparatus 100 includes a battery compartment 10 for accommodating a battery pack 101, a control assembly 20, and an output branch 30.
Referring to fig. 1, the battery compartment 10 is provided with at least two battery interfaces 11. Each battery interface 11 is used for connecting the battery assembly 101, and the battery assembly 101 connected with the battery interface forms a power supply branch 12. In practical applications, the number of the battery interfaces 11 may be set as required. The specifications of the plurality of battery packs 101 connected to the battery interface 11 may be the same or different. Each power supply branch 12 is further provided with a switch 121, and the other end of the switch 121 is connected to the output branch 30, so that the on/off between the power supply branch 12 and the output branch 30 is controlled through the switch 121. In this embodiment, the switch 121 is a switch tube. The control assembly 20 includes an electric quantity detecting unit 21 for detecting the electric quantity of the battery assembly 101, a voltage detecting unit 22 for detecting the voltage of the battery assembly 101, a current detecting unit 23 for detecting the currents of the power supply branch 12 and the output branch 30, and a control unit 24.
In use, the control unit 24 acquires internal information of the battery pack 101 through the battery interface 11, and determines whether an abnormality exists in the battery pack 101 according to the internal information. If the battery assembly 101 is abnormal, the control unit 24 controls the power supply branch 12 corresponding to the battery assembly 101 to stop working, and sends an alarm message to notify the user of the abnormal battery assembly 101. The abnormality may be a missing cell in the battery assembly, an excessive cell or pack voltage, an excessive cell or pack temperature, etc. In this embodiment, the control unit 24 controls whether the power supply branch 12 operates by controlling the switch 121. The control unit 25 controls the electric quantity detection unit 21 to work so as to detect the electric quantity of the battery assembly 101 corresponding to each power supply branch 12. If the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery packs 101 is not less than N1The control unit 24 directly or indirectly controls the upper limit of the output current of each battery assembly 101 to be the rated current I of the battery assembly 101m. If the electric quantity is larger than the first electric quantity threshold value Q1Less than N of the battery packs 1011And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery packs 101 is not less than N2The control unit 24 directly or indirectly controls the upper limit of the output current of each battery pack 101 to be k1*Im. If the electric quantity is larger than the second electric quantity threshold value Q2Less than N of the battery packs 1013The control unit 24 directly or indirectly controls the upper limit of the output current of each battery pack 101 to be k2*ImWherein Q is1>Q2，0<k2<k1<1. Said direct control means that said control unit 24 reduces the current output or the upper current output limit of the supply branch 12 by controlling the duty cycle of the control signal of the switch 121. The indirect control means that the control unit 24 sends a current limit signal to the load 102, so that the purpose of reducing the upper limit of the output current of the battery assembly 101 is indirectly achieved by the way that the load 102 limits power by itself. The first electric quantity threshold Q1A second electric quantity threshold Q2It can be the electric quantity, also can be the electric quantity percentage. Said N is1、N2、N3、k1、k2May be provided as desired. E.g. N1Is set to be 4, N2Is set to be 2, N3Is set to 2, k1Set to 60%, k2The setting is 50%. By the arrangement, the over-discharge of the battery assembly 101 can be effectively avoided, so that the battery assembly 101 is protected, and the service life of the battery assembly 101 is prolonged.
Preferably, the control unit 24 determines the priority level of each power supply branch 12 according to the power level, and then controls the power supply branch 12 with the highest priority level to supply power to the load 102. When the difference between the electric quantity of the currently operating battery assembly 101 and the electric quantity of the battery assembly 101 of the power supply branch 12 corresponding to the next priority level is in the first electric quantity interval, the control unit 24 controls the power supply branch 12 corresponding to the next priority level to operate, and is connected in parallel with the currently operating power supply branch 12 to supply power to the load 102. The size of the first power interval can be set as required. Of course, in other embodiments, the control unit 24 may also determine the priority level of each power supply branch 12 according to the power percentage, and then control the power supply branch 12 with the highest priority level to supply power to the load 102; the charge percentage is a ratio of a current charge to a rated charge of the battery assembly 101. When the difference between the percentage of the electric quantity of the currently operating battery assembly 101 and the percentage of the electric quantity of the battery assembly 101 of the power supply branch 12 corresponding to the next priority level is within the first proportion interval, the control unit 24 controls the power supply branch 12 corresponding to the next priority level to operate, and the power supply branch 12 is connected in parallel with the currently operating power supply branch 12 to supply power to the load 102. The size of the first proportional interval can be set as required. Of course, it is understood that the control unit 24 may also determine the priority level of each power supply branch 12 according to the voltage level, and then control the power supply branch 12 with the highest priority level to supply power to the load 102; when the difference between the voltage of the currently operating battery pack 101 and the voltage of the battery pack 101 of the power supply branch 12 corresponding to the next priority level is in the first voltage interval, the control unit 24 controls the power supply branch 12 corresponding to the next priority level to operate, and connects in parallel with the currently operating power supply branch 12 to supply power to the load 102. The first voltage interval may be 3V to 5V. Of course, the range of the first voltage interval may be set as required.
Preferably, when the voltage detection unit 22 detects that the voltage of the battery assembly 101 is greater than the overvoltage value or less than the undervoltage value, the control unit 24 controls the switch 121 of the power supply branch 12 corresponding to the battery assembly 101 to be turned off, so that the power supply branch 12 corresponding to the battery assembly 101 stops working, and the battery assembly 101 is protected.
Preferably, when the current detecting unit 23 detects that the current of the power supply branch 12 is greater than the first current threshold or smaller than the second current threshold, the control unit 24 controls the power supply branch 12 to stop working, so as to protect the battery assembly 101 and the load 102 corresponding to the power supply branch 12. The first current threshold is the maximum current allowed to pass by the supply branch 12. The second current threshold is the minimum value of current allowed to pass through the supply branch 12, and is typically set to 0. When the current of the power supply branch 12 is less than zero, the battery assembly 101 corresponding to the power supply branch 12 is in a charging state.
Preferably, the control unit 24 also detects the number N of currently operating battery packs 101. The current detection unit 23 also detects the current of the output branch 30, namely: the total current I output by all the currently operating battery packs 101. If I>(N*Im+ Δ I), the control unit 24 directly or indirectly controls the battery assembly 101 to reduce the current output, where Δ I is a preset current offset. Further, when I>(N*Im+ Δ I) and exceeds a preset time threshold, then the control is performedUnit 24 controls, directly or indirectly, the battery assembly 101 to reduce the current output.
Compared with the prior art, the battery pack management device 100 can intelligently limit the output current of the battery pack 101 or intelligently switch the working mode of the load 102 according to the information such as the electric quantity and the quantity of the battery pack 101, so that the working time of the load 102 is prolonged, the defect that the battery pack 101 is excessively used is avoided, the battery pack 101 is protected, the service life of the battery pack 101 is prolonged, and the overall working efficiency of the load 102 is improved.
Referring to fig. 2, the present invention further discloses a battery pack management method for controlling the dry battery packs 101 to work in parallel to supply power to the load 102. The battery pack management method includes the steps of:
s0: detecting whether the battery component corresponding to the power supply branch circuit is abnormal or not; and if the battery assembly is abnormal, closing the power supply branch corresponding to the battery assembly.
S1: and detecting the electric quantity of the battery assembly corresponding to each power supply branch.
S2: judging whether the electric quantity is greater than a first electric quantity threshold value Q1Whether the number of battery modules is not less than N1(ii) a If yes, the control component directly or indirectly controls the upper limit of the output current of each battery component to be the rated current I of the battery componentm(ii) a Otherwise, go to step S3.
S3: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is not less than N2(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k1*Im(ii) a Wherein Q is1>Q2，0<k1<1。
S4: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is less than N3(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k2*ImWherein, 0<k2<k1<1。
Referring to fig. 3, preferably, the step S1 further includes the following steps:
s11: detecting the electric quantity of the battery assembly corresponding to each power supply branch;
s12: determining the priority level of each power supply branch according to the electric quantity;
s13: controlling the power supply branch with the highest priority level to supply power to the load;
s14: and when the difference between the electric quantity of the currently working battery pack and the electric quantity of the battery pack of the power supply branch circuit corresponding to the next priority level is within a first electric quantity interval, controlling the power supply branch circuit corresponding to the next priority level to work, and connecting the power supply branch circuit with the currently working power supply branch circuit in parallel to supply power to the load.
Referring to fig. 4, in other embodiments, the step S1 may further be:
s11': detecting the electric quantity percentage of the battery assembly corresponding to each power supply branch;
s12': determining the priority level of each power supply branch according to the electric quantity percentage;
s13': controlling the power supply branch with the highest priority level to supply power to the load;
s14': and when the difference between the electric quantity percentage of the currently working battery pack and the electric quantity percentage of the battery pack of the power supply branch corresponding to the next priority level is within the first proportion interval, controlling the power supply branch corresponding to the next priority level to work, and connecting the power supply branch with the currently working power supply branch in parallel to supply power to the load.
Referring to fig. 5, it is understood that, in other embodiments, the step S1 may also be:
s11': detecting the voltage of a battery assembly corresponding to each power supply branch circuit;
s12': determining the priority level of each power supply branch according to the voltage;
s13': controlling the power supply branch with the highest priority level to supply power to the load;
s14': and when the difference between the voltage of the currently working battery pack and the voltage of the battery pack of the power supply branch corresponding to the next priority level is in a first voltage interval, controlling the power supply branch corresponding to the next priority level to work, and connecting the power supply branch with the currently working power supply branch in parallel to supply power to the load.
Referring to fig. 6, the present invention further discloses an electric vehicle 200, which includes a traveling mechanism 201, an operating mechanism 202, a control mechanism (not shown) for controlling the operation of the traveling mechanism 201 and the operating mechanism 202, a plurality of dry battery packs 101, and the battery pack management apparatus 100. In this embodiment, the work implement 202 is a mowing assembly, but in other embodiments, the work implement 202 may be other functional assemblies. In the present embodiment, the control means controls the traveling means 201 and the working means 202 at the same time, but in another embodiment, a traveling control means for controlling the traveling means 201 and a working control means for controlling the working means 202 may be provided separately. The battery pack management device 100 controls the dry battery packs 101 to work in parallel in cooperation to supply power to the travelling mechanism 101 and the operating mechanism 102. When the electric quantity is larger than a first electric quantity threshold value Q1The number of the battery packs 101 is not less than N1The control unit 24 sends a performance priority signal to the control mechanism, the control mechanism does not limit the traveling mechanism 101 and the working mechanism 102, and the traveling mechanism 101 can move at the maximum speed VmThe working mechanism 102 can run at the maximum speed RmAnd (6) performing operation. At this time, the electric vehicle 200 is in the performance priority mode, that is: the first state can deal with the grass conditions with more complex and heavy environment. When the electric quantity is larger than a first electric quantity threshold value Q1Less than N of the battery packs 1011And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery packs 101 is not less than N2Then, the control unit 24 sends a current limiting signal to the control mechanism, and the control mechanism controls the running mechanism 201 and the operating mechanism 202 to run at a medium speed, where the maximum running speed of the running mechanism 201 is k3*VmThe maximum rotation speed of the working mechanism 202 is k4*RmSo that the output current of the battery assembly 101 is not more than the upper limit k1*Im. At this timeThe electric vehicle 200 is in an energy saving mode, that is: in the second state, a light grass condition can be dealt with. When the electric quantity is larger than a second electric quantity threshold value Q2Less than N of the battery packs 1013Then, the control unit 24 sends a current limiting signal to the control mechanism, and the control mechanism controls the running mechanism 201 and the operation mechanism 202 to run at a low gear speed, at this time, the maximum running speed of the running mechanism is k5*VmThe maximum rotation speed of the working mechanism 202 is k6*RmSo that the output current of the battery pack 101 does not exceed the upper limit k2*Im. At this time, the electric vehicle 200 is in the super energy saving mode, that is: and in the third state, simple grass conditions can be dealt with. In this embodiment, the number of the battery packs 101 is 6, and Q is150% of said Q 220% of said N1Is 4, the said N2、N3Is 2, said k3、k4Is 0.6, said k5、k6Is 0.6. Of course, it is understood that in other embodiments, the Q is1、Q2、N1、N2、N3、k3、k4、k5、k6The numerical value of (c) can also be set as desired.
In this embodiment, when the electric quantity is greater than the second electric quantity threshold Q2Less than N of the battery packs 1013Controlling the electric vehicle 200 to be in a third state; however, it is understood that in other embodiments, it may be configured as follows: when the electric quantity is larger than the third electric quantity threshold value Q3Less than N of the battery packs 1013Controlling the electric vehicle 200 in a third state, in which: q3≤Q2。
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (19)

1. A battery pack management apparatus for controlling a battery pack to supply power to a load, comprising:
each battery interface is used for connecting the battery component and forming a power supply branch circuit with the battery component connected with the battery interface; and
the control assembly detects the electric quantity of the battery assembly corresponding to each power supply branch circuit;
if the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery components is not less than N1The control component directly or indirectly controls the upper limit of the output current of each battery component to be the rated current I of the battery componentm(ii) a If the electric quantity is larger than the first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2The control component directly or indirectly controls the upper limit of the output current of each battery component to be k1*ImWherein Q is1>Q2，0<k1<1。
2. The battery pack management apparatus according to claim 1, wherein: the control component determines the priority level of each power supply branch according to the electric quantity, and then controls the power supply branch with the highest priority level to supply power to the load; when the difference between the electric quantity of the currently working battery pack and the electric quantity of the battery pack of the power supply branch circuit corresponding to the next priority level is within a first electric quantity interval, the control assembly controls the power supply branch circuit corresponding to the next priority level to work and is connected with the currently working power supply branch circuit in parallel to supply power for the load.
3. The battery pack management apparatus according to claim 1, wherein: the control component determines the priority level of each power supply branch according to the electric quantity percentage, and then controls the power supply branch with the highest priority level to supply power to the load; when the difference between the electric quantity percentage of the currently working battery pack and the electric quantity percentage of the battery pack of the power supply branch corresponding to the next priority level is within the first proportion interval, the control assembly controls the power supply branch corresponding to the next priority level to work and is connected with the currently working power supply branch in parallel to supply power to the load.
4. The battery pack management apparatus according to claim 1, wherein: the control component determines the priority level of each power supply branch according to the voltage, and then controls the power supply branch with the highest priority level to supply power to the load; when the voltage difference between the voltage of the currently working battery pack and the voltage of the battery pack of the power supply branch corresponding to the next priority level is in a first voltage interval, the control assembly controls the power supply branch corresponding to the next priority level to work and is connected with the currently working power supply branch in parallel to supply power to the load.
5. The battery pack management apparatus according to claim 1, wherein: if the electric quantity is larger than the second electric quantity threshold value Q2Less than N3The control component directly or indirectly controls the upper limit of the output current of each battery component to be k2*ImWherein, 0<k2<k1<1。
6. The battery pack management apparatus according to claim 1, wherein: when the power supply branch circuit is controlled to work, the control assembly acquires internal information of the battery assembly and judges whether the battery assembly is abnormal or not; and if the battery assembly is abnormal, the control assembly controls the power supply branch corresponding to the battery assembly to stop working.
7. The battery pack management apparatus according to claim 1, wherein: and when the control assembly detects that the voltage of the battery assembly is greater than the overvoltage value or less than the undervoltage value, the control assembly controls the power supply branch corresponding to the battery assembly to stop working.
8. The battery pack management apparatus according to claim 1, wherein: the control component detects the current of each power supply branch circuit; when the current of the power supply branch circuit is larger than the first current threshold value or smaller than the second current threshold value, the control component controls the power supply branch circuit to stop working.
9. The battery pack management apparatus according to claim 1, wherein: the control assembly detects the number N of the currently working battery assemblies and the total current I output by all the currently working battery assemblies; if I>(N*Im+ Δ I), the control component controls the battery component to reduce current output; where Δ I is the current offset.
10. The battery pack management apparatus according to claim 9, wherein: when I is>(N*Im+ Δ I) and exceeds a preset time threshold, the control assembly controls the battery assembly to reduce the current output.
11. The battery pack management apparatus according to claim 1, wherein: the power supply branch circuit is provided with a switching tube; when the current of the power supply branch exceeds the upper limit of the output current of the power supply branch, the control component reduces the current output of the power supply branch by controlling the duty ratio of the control signal of the switching tube.
12. The battery pack management apparatus according to claim 1, wherein: the control assembly detects the number N of the currently working battery assemblies and the total current I output by all the currently working battery assemblies; if I>(N*Im+ Δ I), the control component sends a current limit signal to the load, which operates in a low power state in accordance with the current limit signal.
13. A battery pack management method is used for controlling a plurality of battery packs to work in parallel to supply power to a load, and is characterized by comprising the following steps:
s1: detecting the electric quantity of the battery assembly corresponding to each power supply branch;
s2: judging whether the electric quantity is greater than a first electric quantity threshold value Q1Whether the number of battery modules is not less than N1(ii) a If yes, the control component directly or indirectly controls the upper limit of the output current of each battery component to be the rated current I of the battery componentm(ii) a Otherwise, jumping to step S3;
s3: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is not less than N2(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k1*Im(ii) a Wherein Q is1>Q2，0<k1<1。
14. The battery pack management method according to claim 13, further comprising step S4 of: judging that the electric quantity is greater than a second electric quantity threshold value Q2Whether the number of battery modules is less than N3(ii) a If yes, the control component directly or indirectly controls the output current of each battery component to be at the upper limit k2*ImWherein, 0<k2<k1<1。
15. The battery pack management method according to claim 13, further comprising step S0 of: detecting whether the battery component corresponding to the power supply branch circuit is abnormal or not; and if the battery assembly is abnormal, closing the power supply branch corresponding to the battery assembly.
16. The battery pack management method according to claim 13, wherein the step S1 further includes the steps of:
s11: detecting the electric quantity of the battery assembly corresponding to each power supply branch;
s12: determining the priority level of each power supply branch according to the electric quantity;
s13: controlling the power supply branch with the highest priority level to supply power to the load;
s14: and when the difference between the electric quantity of the currently working battery pack and the electric quantity of the battery pack of the power supply branch circuit corresponding to the next priority level is within a first electric quantity interval, controlling the power supply branch circuit corresponding to the next priority level to work, and connecting the power supply branch circuit with the currently working power supply branch circuit in parallel to supply power to the load.
17. An electric vehicle, characterized by comprising:
a traveling mechanism;
an operating mechanism;
a control mechanism;
if the dry battery component is available; and
the battery pack management device is used for controlling the battery pack to supply power to a load; the battery pack management apparatus includes:
each battery interface is used for connecting the battery component and forming a power supply branch circuit with the battery component connected with the battery interface; and
the control assembly detects the electric quantity of the battery assembly corresponding to each power supply branch circuit;
if the electric quantity is larger than the first electric quantity threshold value Q1The number of the battery components is not less than N1Controlling the electric vehicle to be in a first state; if the electric quantity is larger than the first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2Controlling the electric vehicle to be in a second state; if the electric quantity is larger than the second electric quantity threshold value Q2Less than N2And the electric quantity is greater than a third electric quantity threshold value Q3Less than N3And if so, controlling the electric vehicle to be in a third state.
18. The electric vehicle of claim 17, characterized in that: when the electric quantity is larger than a first electric quantity threshold value Q1Less than N1And the electric quantity is greater than a second electric quantity threshold value Q2The number of the battery components is not less than N2The control component sends a current limiting signal to the control mechanism; the control mechanism controls the walkingThe mechanism and the operation mechanism run at a middle gear speed so that the output current of the battery pack is not more than an upper limit k1*Im。
19. The electric vehicle of claim 18, characterized in that: if the electric quantity is larger than the third electric quantity threshold value Q3Less than N3And the control component sends a current limiting signal to the control mechanism, and the control mechanism controls the running mechanism and the operation mechanism to run at a low gear speed.
CN202011107782.0A 2020-03-26 2020-10-16 Battery pack management device and management method and electric vehicle Active CN112339613B (en)

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CN202011107782.0A CN112339613B (en) 2020-10-16 2020-10-16 Battery pack management device and management method and electric vehicle
CN202111366635.XA CN114084043B (en) 2020-10-16 2020-10-16 Battery management system, battery management method, and electric vehicle
AU2021244766A AU2021244766A1 (en) 2020-03-26 2021-03-25 Electric vehicle and battery system
MX2022011930A MX2022011930A (en) 2020-03-26 2021-03-25 Electric vehicle and battery system.
CA3173514A CA3173514A1 (en) 2020-03-26 2021-03-25 Electric vehicle and battery system
EP21777114.6A EP4131708A4 (en) 2020-03-26 2021-03-25 Electric vehicle and battery system
PCT/CN2021/083071 WO2021190612A1 (en) 2020-03-26 2021-03-25 Electric vehicle and battery system
US17/913,564 US20230105559A1 (en) 2020-03-26 2021-03-25 Electric vehicle and battery system

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