CN113541243A - Battery pack charging system and charging method thereof - Google Patents

Battery pack charging system and charging method thereof Download PDF

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Publication number
CN113541243A
CN113541243A CN202110705172.9A CN202110705172A CN113541243A CN 113541243 A CN113541243 A CN 113541243A CN 202110705172 A CN202110705172 A CN 202110705172A CN 113541243 A CN113541243 A CN 113541243A
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CN
China
Prior art keywords
battery pack
charging
nitrogen
gas
battery
Prior art date
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Pending
Application number
CN202110705172.9A
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Chinese (zh)
Inventor
邓毅
张立磊
李明明
王春力
王洋
时晓彤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yantai Chungway New Energy Technology Co Ltd
Original Assignee
Yantai Chungway New Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yantai Chungway New Energy Technology Co Ltd filed Critical Yantai Chungway New Energy Technology Co Ltd
Priority to CN202110705172.9A priority Critical patent/CN113541243A/en
Priority to US17/490,994 priority patent/US20220376516A1/en
Priority to KR1020210134421A priority patent/KR102606913B1/en
Priority to EP21201877.4A priority patent/EP4091862A1/en
Priority to JP2021166697A priority patent/JP7260927B2/en
Publication of CN113541243A publication Critical patent/CN113541243A/en
Pending legal-status Critical Current

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    • 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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a battery pack charging system, which comprises a battery pack and a charging cabinet, wherein a nitrogen gas replacement device is arranged in the charging cabinet, and the charging cabinet provides charging and nitrogen gas charging for the battery pack, and is characterized in that: and an inflation protection device is arranged between the nitrogen replacement device and the battery pack and is used for automatically adjusting the inflation flow of nitrogen. A charging method of the battery pack charging system is also disclosed. Has the advantages that: the invention changes the battery pack form of the existing electric bicycle and provides feasible technical support for 'sharing battery replacement' of the battery pack of the existing electric bicycle; secondly, on the basis of improving the battery pack of the electric bicycle, a battery cabinet capable of charging and charging nitrogen into the battery pack is provided for the battery pack, so that thermal runaway of the battery is prevented and controlled fundamentally; moreover, a new method is provided for charging nitrogen into the battery pack, and the defects of using double electromagnetic valves and an oxygen concentration sensor in the prior art are overcome.

Description

Battery pack charging system and charging method thereof
Technical Field
The invention relates to the technical field of charging of battery packs of electric bicycles, in particular to a battery pack charging system and a charging method thereof.
Background
Electric products such as electric bicycles are more and more favored by people for short-distance trips due to the characteristics of convenience, economy and the like, the holding amount of the electric products is also increased rapidly, but safety accidents caused by ignition of batteries of the electric products such as the electric bicycles are continuously generated.
In 2019, the lead-acid storage battery is a year of formal arrival in the new national standard era, the whole market is also shifted to the lithium battery from the lead-acid storage battery, and meanwhile, the 'battery replacement' business model is also mentioned. The mode of 'vehicle-electricity separation and sharing electricity changing' is a new opportunity for the development of the electric vehicle industry. The 'vehicle-electricity separation and sharing battery replacement' provides a shared charging cabinet, when the electric quantity of the battery of the electric vehicle is insufficient, the battery pack of the electric vehicle is detached, and charging supplement is carried out in the shared charging cabinet. But the small-size lithium ion battery package of detachable electric bicycle is safe not negligible. At present, a battery pack of an electric bicycle is only provided with a charging interface and does not have a decompression valve for charging protection, nitrogen charging protection and other protection measures.
In the technology of charging nitrogen gas, the nitrogen gas is generally charged outside the battery pack in a sealed space to prevent thermal runaway of the battery pack. The applicant previously filed a patent of charging nitrogen gas into a battery pack, and nitrogen gas was generated by a nitrogen gas replacement device; the charging of nitrogen and the discharging of other gases (such as oxygen) in the battery pack are realized by utilizing the air inlet pipe and the air outlet pipe; the air inlet pipe and the air outlet pipe are respectively provided with an electromagnetic valve for controlling the on-off of the air inlet and the air outlet. In the actual inflation operation of this prior application technique, install oxygen concentration sensor in the battery package, through detecting the interior oxygen content of battery package, control the switch of solenoid valve in proper order, finally realize the requirement of the interior low oxygen of every battery package, however this technique can only be to filling nitrogen gas in a battery package at every turn, and it is long to fill gas and consume time, and it is low to aerify efficiency, and the solenoid valve for the vehicle is expensive for aerify the cost and increase.
According to the working principle of the method for filling the nitrogen into the battery pack, the oxygen concentration sensor is used for detecting the real-time concentration of the oxygen in the battery pack, when the fact that the oxygen in the battery pack exceeds the standard is detected, the BMS system of the battery pack gives an alarm, and workers timely fill the nitrogen to discharge redundant oxygen in the battery pack, so that the safety of the battery pack of the electric vehicle is guaranteed. However, the oxygen concentration sensor is expensive, has short service life, cannot play a role in early warning once a fault occurs, and is difficult to replace after the battery pack is covered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a battery pack charging system which comprises a battery pack which is additionally provided with a pressure release valve, a nitrogen gas inlet, a charging socket, a BMS system and a detector and is applied to an electric bicycle; the battery cabinet is internally provided with a nitrogen displacement device, a charging device and a charging cabin body, and the nitrogen displacement device and the charging device charge and charge the battery pack in the charging cabin body with nitrogen; and the inflation protection device is arranged between the battery pack and the nitrogen replacement device and is used for automatically adjusting the inflation flow of the nitrogen. The charging method of the battery pack charging system is provided, and the oxygen concentration sensor detection charging mode in the prior art is replaced by a special innovative charging method. Firstly, the invention changes the battery pack form of the existing electric bicycle and provides feasible technical support for the 'sharing battery replacement' of the battery pack of the existing electric bicycle; secondly, on the basis of improving the battery pack of the electric bicycle, a battery cabinet capable of charging and charging nitrogen into the battery pack is provided for the battery pack, so that thermal runaway of the battery is prevented and controlled fundamentally; moreover, a new method is provided for charging nitrogen into the battery pack, and the defects of using double electromagnetic valves and an oxygen concentration sensor in the prior art are overcome.
The aim of the invention is achieved by the following technical measures: the utility model provides a battery package charging system, includes the battery package and charges the cabinet, it has nitrogen gas replacement device to charge the cabinet built-in, it does to charge the cabinet the battery package provides to charge and fills nitrogen gas be equipped with between nitrogen gas replacement device and the battery package and aerify protection device, it is used for the aeration flow of automatically regulated nitrogen gas to aerify protection device.
Further, aerify protection device includes controller, flow control valve and gas conveying line, the nitrogen gas replacement device passes through the solenoid valve with gas conveying line's entrance point and is connected, gas conveying line's exit end is equipped with a plurality of branches, and a plurality of branches pass through flow control valve with a plurality of battery package respectively and are connected, branch road and battery package one-to-one, establish the detector in the battery package, the detector is used for detecting the gas information in the battery package, and the controller is connected with solenoid valve, detector and flow control valve electricity respectively.
Further, flow control valve includes casing, flow sensor, motor, valve block and pivot, the casing divide into and holds chamber and gas passage, it is sealed cavity to hold the chamber, the motor is established and is held the intracavity, valve block and flow sensor establish in gas passage, the motor is connected with the one end of pivot, the other end of pivot stretches into in the gas passage and is connected with the valve block, flow sensor is used for detecting the gas flow in the gas passage and carries flow information to the detector.
Further, the valve plate and the flow sensor are sequentially arranged along the flowing direction of the gas.
Furthermore, the size of the cross section of the valve plate is matched with that of the cross section of the gas channel, and the rotation angle theta of the valve plate is larger than or equal to 0 degree and smaller than or equal to 90 degrees.
Further, the detector comprises a sensor and a control module, the sensor is used for detecting gas information in the battery pack and transmitting the detected information to the controller, and the control module is used for controlling the flow regulating valve.
Further, the cabinet that charges includes the cabinet body, charging system and nitrogen gas replacement device, internal portion of cabinet is located to charging system and nitrogen gas replacement device, charging system and nitrogen gas replacement device independently set up respectively, set up interface and the nitrogen gas interface that charges respectively on the lateral wall of the cabinet body, the interface that charges is connected with the charging system electricity, nitrogen gas interface and nitrogen gas replacement device switch-on, the cabinet that charges for the battery package through the interface that charges, the cabinet that charges fills nitrogen gas for the battery package through the nitrogen gas interface.
Furthermore, more than 1 socket is opened on the lateral wall of the cabinet body, and a charging interface and 1 nitrogen interface are arranged in parallel in a single socket.
A charging method of a battery pack charging system comprises the battery pack charging system, and comprises the following steps:
step 1, adding a pressure release valve, a nitrogen inlet, a charging socket, a BMS system and a detector on a battery pack of a two-wheeled vehicle or a three-wheeled vehicle;
step 2, placing the battery pack into a charging cabinet, connecting a nitrogen gas inlet and a nitrogen interface, and connecting a charging socket and a charging interface;
step 3, in a nitrogen replacing device of the charging cabinet, removing moisture of compressed air through a dryer, removing large-particle impurities of the air through a filter, and then preparing high-concentration nitrogen through a nitrogen making machine, wherein the high-concentration nitrogen flows to a nitrogen interface of each charging cabinet socket through a gas pipeline;
step 4, starting a charging system, and respectively and simultaneously charging and charging nitrogen for the battery pack in the charging cabinet; in the process of filling nitrogen, the operation method of the inflation protection device is as follows: 1) presetting control parameters: inputting the nitrogen pre-charging time Tm and the maximum pressure difference delta P inside and outside the battery pack into a controller, starting a nitrogen replacement device, starting to charge nitrogen into the battery pack, and simultaneously starting to record the time t; 2) acquiring external pressure Pw of the battery pack and internal pressure Pn of the battery pack, calculating internal and external pressure difference of the battery pack, and acquiring actual nitrogen charging time Ts of the battery pack if the internal and external pressure difference of the battery pack is smaller than delta P; 3) and (3) judging whether the actual nitrogen charging time Ts of the battery pack is more than or equal to the nitrogen pre-charging time Tm of the battery pack, if so, stopping the nitrogen replacement device, stopping charging the nitrogen into the battery pack, finishing the one-time nitrogen charging process of the battery pack, and otherwise, returning to the step 2).
Further, in the step 2), if the pressure difference between the inside and the outside of the battery pack is greater than or equal to Δ P, the nitrogen displacement device is stopped, the battery pack stops being charged with nitrogen, the external pressure Pw of the battery pack and the internal pressure Pn of the battery pack are collected again, the pressure difference between the inside and the outside of the battery pack is calculated, and if the pressure difference between the inside and the outside of the battery pack is greater than Δ P, the system performs self-inspection; otherwise, judging whether the pressure difference between the inside and the outside of the battery pack is smaller than the delta P or collecting the time Tt' for stopping filling the nitrogen into the battery pack.
Further, whether the pressure difference between the inside and the outside of the battery pack is smaller than delta P is judged, if yes, the nitrogen replacement device is started again, the battery pack is charged with nitrogen again, otherwise, the pressure Pw outside the battery pack and the pressure Pn inside the battery pack are collected continuously, and the relation between the pressure difference between the inside and the outside of the battery pack and the delta P is judged.
Further, when the time Tt 'of stopping filling nitrogen into the battery pack is acquired, the control parameters in 1) further include an inflation suspension time Tz, whether the time Tt' is greater than or equal to the time Tz is judged, if yes, the control parameters are returned to 1), the nitrogen replacement device is restarted, the battery pack is refilled with nitrogen, otherwise, the time Tt 'of stopping filling nitrogen into the battery pack is continuously acquired, and the relation between the time Tt' and the time Tz is judged.
Further, the control parameters in 1) further include interval nitrogen charging time Tj, after the battery pack stops charging nitrogen in 3), collecting a time length Tt of the battery pack stopping charging, judging whether Tt is greater than or equal to Tj, if yes, returning to 1), restarting the nitrogen replacement device, and recharging nitrogen into the battery pack; otherwise, continuously collecting the time Tt for stopping the inflation of the battery pack and judging the relation between the Tt and the Tj.
Compared with the prior art, the invention has the beneficial effects that: firstly, the invention changes the battery pack form of the existing electric bicycle and provides feasible technical support for the 'sharing battery replacement' of the battery pack of the existing electric bicycle; secondly, on the basis of improving the battery pack of the electric bicycle, a battery cabinet capable of charging and charging nitrogen into the battery pack is provided for the battery pack, so that thermal runaway of the battery pack is prevented and controlled fundamentally; moreover, a new method is provided for charging nitrogen into the battery pack, and the defects of using double electromagnetic valves and an oxygen concentration sensor in the prior art are overcome. Inside the cabinet that charges, once can charge and/or fill a plurality of battery package of nitrogen gas, charge and/or fill the high efficiency of nitrogen gas, aerify fast. One electromagnetic valve controls the nitrogen on-off of the nitrogen replacement device, and the input cost of the electromagnetic valve is low. The regulation of charging nitrogen into the battery pack is completed through a flow regulating valve and a new charging method without the detection of an oxygen concentration sensor.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic diagram of a connection structure of the battery pack charging system.
Fig. 2 is a schematic structural view of a flow regulating valve in the inflation protection device.
Fig. 3 is a schematic structural diagram of the charging cabinet.
Fig. 4 is a schematic structural view of a battery pack.
Wherein, 1, nitrogen gas replacement device, 2, solenoid valve, 3, gas transmission pipeline, 4, battery package, 5, flow control valve, 6, controller, 7, the detector, 8, hold the chamber, 9, gas channel, 10, the motor, 11, the pivot, 12, the valve block, 13, flow sensor, 14, the cabinet body, 15, the socket, 16, the interface that charges, 17, the nitrogen gas interface, 18, charging device, 19, the relief valve, 20, the nitrogen gas inlet, 21, the socket that charges, 22, the BMS system, 23, battery package shell.
Detailed Description
As shown in fig. 1 to 4, a battery pack charging system comprises a battery pack 4 and a charging cabinet, wherein a nitrogen gas replacement device 1 is arranged in the charging cabinet, the charging cabinet provides charging and charging nitrogen gas for the battery pack 4, an inflation protection device is arranged between the nitrogen gas replacement device 1 and the battery pack 4, and the inflation protection device is used for automatically adjusting the inflation flow of the nitrogen gas.
Aerify protection device includes controller 6, flow control valve 5 and gas transmission pipeline 3, nitrogen gas replacement device 1 passes through solenoid valve 2 with the entrance point of gas transmission pipeline 3 and is connected, the exit end of gas transmission pipeline 3 is equipped with a plurality of branches, and a plurality of branches pass through flow control valve 5 with a plurality of battery package 4 respectively and are connected, and branch road and battery package 4 one-to-one establish detector 7 in battery package 4, detector 7 is used for detecting the gaseous information in the battery package 4, and controller 6 is connected with solenoid valve 2, detector 7 and flow control valve 5 electricity respectively. The detector 7 transmits detection information to the controller 6, the controller 6 controls the flow regulating valve 5 after receiving the detection information, and the controller 6 is used for controlling the opening or closing of the electromagnetic valve 2 according to the detection information of the detector 7. Specifically, the nitrogen gas is provided by the nitrogen gas replacement device 1, and certainly, the nitrogen gas replacement device 1 can be replaced by a generation device of other incombustible gases to supply other incombustible gases, such as helium and the like, to the battery packs 4, the nitrogen gas respectively enters the plurality of battery packs 4 through the gas conveying pipelines 3, and the flow of the nitrogen gas entering each battery pack 4 is adjusted by the flow adjusting valve 5, so that the nitrogen gas is uniformly filled into each battery pack 4 in a short time, the filling time is short, and the filling efficiency is high; meanwhile, only one electromagnetic valve 2 is arranged at the inlet end of the gas conveying pipeline 3, and the on-off of nitrogen gas is controlled through one electromagnetic valve 2, so that the use number of the electromagnetic valves 2 is reduced, and the inflation cost is reduced.
Flow control valve 5 includes casing, flow sensor 13, motor 10, valve block 12 and pivot 11, the casing divide into and holds chamber 8 and gas channel 9, it is sealed cavity to hold chamber 8, motor 10 is established and is holding in chamber 8, valve block 12 and flow sensor 13 are established in gas channel 9, motor 10 is connected with the one end of pivot 11, the other end of pivot 11 stretches into in the gas channel 9 and is connected with valve block 12, flow sensor 13 is used for detecting the gas flow in the gas channel 9 and carries flow information to detector 7. Specifically, the flow sensor 13 is in communication connection with the detector 7, and the detector 7 is used for controlling the motor 10. The flow sensor 13 is used for detecting flow information and transmitting the flow information to the detector 7, the detector 7 is used for comparing the detected flow information with a set value and then sending out an execution command, the rotation of the motor 10 is controlled through the execution command, the rotation of the motor 10 drives the rotating shaft 11 to rotate and further drives the valve plate 12 to rotate, the size of the flow cross section of fluid in the gas channel 9 is adjusted through the rotation of the valve plate 12, and therefore the automatic adjustment of the gas flow in the gas channel 9 is achieved. In addition, hold chamber 8 and gas channel 9 and separate apart, establish motor 10 and circuit etc. and can play the guard action to motor 10 and circuit in holding chamber 8, reduce the impact of gas flow to motor 10 and circuit, simultaneously, also can avoid gas to flow into and hold chamber 8 and produce the swirl, cause gas flow fluctuation, improve flow sensor 13's detection precision.
The valve plate 12 and the flow sensor 13 are sequentially arranged along the flow direction of the gas. Namely, the valve plate 12 is arranged close to the inlet end of the gas channel 9, the flow sensor 13 is arranged close to the outlet end of the gas channel 9, and the flow sensor 13 is arranged behind the valve plate 12, so that the flow information detected by the flow sensor 13 is ensured to be closer to the gas flow entering the battery pack 4, and the detection precision of the flow sensor 13 is further improved.
The size of the cross section of the valve plate 12 is matched with that of the cross section of the gas channel 9, and the rotation angle theta of the valve plate 12 is larger than or equal to 0 degree and smaller than or equal to 90 degrees. Specifically, when θ is 0 °, the valve plate 12 is perpendicular to the axial center line of the gas passage 9, the valve plate 12 seals the gas passage 9, and no gas is charged into the battery pack 4; when θ is 90 °, the valve sheet 12 is parallel to the axial center line of the gas passage 9, the flow rate in the gas passage 9 reaches the maximum, and at this time, the battery pack 4 is charged with gas at the maximum flow rate.
The detector 7 comprises a sensor and a control module, the sensor is used for detecting gas information in the battery pack 4 and transmitting the detected information to the controller 6, and the control module is used for controlling the flow regulating valve 5. In particular, the control module is used to control the motor 10. The sensor transmits the detected gas information in the battery pack 4 to the controller 6, and after the gas information in the controller 6 is compared with a set value, the controller 6 sends out an execution command to open or close the electromagnetic valve 2. The controller 6 is used for controlling the on-off of the gas in the gas conveying pipeline 3, and the control module is used for adjusting the flow rate of the gas in the gas conveying pipeline 3, so that the gas flow rate is controlled and the interference is complemented.
The sensor is one or more of a pressure sensor and a concentration sensor. Specifically, when the pressure sensor is used for detecting the pressure in the battery pack 4, when the pressure in the battery pack 4 reaches a set value, the electromagnetic valve 2 is closed, and gas introduction is stopped, so that the battery pack 4 is prevented from being damaged due to overhigh pressure. When the concentration sensor is used, the concentration sensor can be an oxygen concentration sensor or a nitrogen concentration sensor for detecting the change of the gas concentration in the battery pack 4, and when the oxygen concentration is lower than a set value or the nitrogen concentration is higher than the set value, the electromagnetic valve 2 can be closed to stop the gas introduction. The sensor may also be a smoke sensor, a VOC sensor, a hydrogen sensor, a CO sensor, a temperature sensor, or the like.
The control module is connected with the flow regulating valve 5 through the motor driving module. Specifically, the motor 10 driving module is an L298N motor driving module, and the motor driving module is used for controlling the motor 10, so that forward transmission and reverse rotation of the motor 10 are realized, and further, the flow rate is adjusted to be large or small.
The cabinet that charges is including the storehouse body, the cabinet body 14, charging device 18 and nitrogen gas replacement device 1 that charges, and the storehouse body and the cabinet body 14 that charge set up side by side adjacently, and the battery package 4 accomplishes charging and fills nitrogen gas in the storehouse body that charges, charging device 18 and nitrogen gas replacement device 1 locate the internal portion of cabinet, charging device 18 and nitrogen gas replacement device 1 set up independently respectively, set up interface 16 and the nitrogen gas interface 17 that charges respectively on the lateral wall of the cabinet body 14, the interface 16 that charges is connected with charging device 18 electricity, nitrogen gas interface 17 and nitrogen gas replacement device 1 switch-on, the cabinet that charges for battery package 4 through the interface 16 that charges, the cabinet that charges fills nitrogen gas for battery package 4 through nitrogen gas interface 17. The charging cabinet can provide a charging function for the battery pack 4 and can also provide a nitrogen charging function for the battery pack 4. Among the prior art, electric bicycle's battery package 4 only has the protection in the charging process on the thermal runaway protection, carries out the nitrogen replacement cooling in the cabinet that charges to battery package 4 in the charging process promptly, perhaps nitrogen gas puts out a fire. The safety protection of the battery pack 4 of the electric bicycle is lacked in the using process. Really solve the thermal runaway of battery package 4 in the charging process from the source, can also solve the thermal runaway of battery package 4 in the use, play the safety protection of use to battery package 4. The charging interface 16 and the nitrogen interface 17 can be operated simultaneously, or can be separately charged with nitrogen or charged separately. The charging interface 16 is used when the battery pack 4 is short of power. The nitrogen interface 17 is used for charging the battery pack 4 or for replacing the battery. The battery pack 4 is used on the electric bicycle for a period of time, the electric quantity may be still, but the oxygen concentration inside the battery pack 4 increases along with the use, although the oxygen concentration increases slowly in normal use, when the oxygen concentration inside the battery pack 4 increases to a certain proportion, the oxygen concentration is dangerous, and thermal runaway is easy to occur, so that the nitrogen gas needs to be supplemented into the charging cabinet for the battery pack 4 used by the electric bicycle for a period of time, so as to better perform safety protection on the thermal runaway for the battery pack 4. Certainly, the battery pack 4 used in cooperation with the charging cabinet should be provided with a nitrogen gas charging port, an air outlet and the like.
The charging interface 16 and the nitrogen interface 17 are arranged on the same side wall of the cabinet 14. The charging interface 16 and the nitrogen interface 17 are arranged on one side close to the charging cabin body. The charging interface 16 and the nitrogen interface 17 can be respectively arranged on different side walls of the cabinet body 14, and can be more conveniently connected with the battery pack 4 only when arranged on the same side wall of the cabinet body 14, and the manufacturing difficulty of the cabinet body 14 can also be reduced.
More than 1 socket 15 is opened on the lateral wall of cabinet 14, and a charging interface 16 and 1 nitrogen gas interface 17 are arranged in parallel in a single socket 15. The socket 15 is a space opened in the cabinet 14 for accommodating a charging port 16 and/or a nitrogen port 17. This design may enable one socket 15 to serve one battery pack 4.
When the side wall of the cabinet body 14 is provided with a plurality of sockets 15, the charging interfaces 16 in the plurality of sockets 15 are connected in parallel, and the nitrogen interfaces 17 in the plurality of sockets 15 are connected in parallel. The parallel design can ensure that a single charging interface 16 or a single nitrogen interface 17 can be used normally.
The nitrogen gas replacement device 1 comprises an air compressor, a cold dryer, an air filter, a nitrogen making machine and the like, wherein after the air compressor, the cold dryer, the air filter and the nitrogen making machine are sequentially connected, the outlet end of the nitrogen making machine is connected with an inflation protection device through an electromagnetic valve 2. The nitrogen making machine adopts a membrane separation nitrogen making machine, a pressure swing adsorption nitrogen making machine and the like.
A charging method of a battery pack charging system comprises the battery pack charging system, and comprises the following steps:
step 1, adding a pressure release valve 19, a nitrogen gas inlet 20, a charging socket 21, a BMS system 22 and a detector 7 on a battery pack 4 of a two-wheeled vehicle or a three-wheeled vehicle; controlling the battery pack operation mode, i.e., controlling the battery pack charging or discharging, by the BMS system 22; battery pack voltage and current can also be detected by the BMS system 22; the detectors can also be controlled by the BMS system 22. The pressure release valve 19 is installed on the top or one side of the battery pack, and the pressure release valve can be a waterproof breathable film structure or a waterproof breathable film structure with a one-way pressure maintaining function. The battery pack 4 comprises a battery pack shell 23, the pressure release valve 19, the nitrogen inlet 20 and the charging jack 21 are respectively arranged on the outer side wall of the battery pack shell 23, the BMS system 22 is arranged on the inner side wall of the battery pack shell 23, and the detector 7 is arranged in the battery pack shell 23. The nitrogen inlet 20 and the charging inlet 21 are provided on the same side wall of the battery pack case 23.
Step 2, placing the battery pack 4 into a charging bin body of a charging cabinet, connecting a nitrogen gas inlet 20 and a nitrogen interface 17, and connecting a charging socket 21 and a charging interface;
step 3, in the nitrogen replacement device 1 of the charging cabinet, removing moisture from compressed air through a dryer, removing large-particle impurities from the air through a filter, and then preparing high-concentration nitrogen through a nitrogen making machine, wherein the high-concentration nitrogen flows to the nitrogen interface 17 of each charging cabinet socket through a gas pipeline;
step 4, starting a charging system, and respectively and simultaneously charging and charging nitrogen for the battery pack 4 in the charging cabinet; in the process of filling nitrogen, the operation method of the inflation protection device is as follows: 1) presetting control parameters: inputting the nitrogen pre-charging time Tm of the battery pack 4 and the maximum pressure difference delta P between the inside and the outside of the battery pack 4 into the controller 6, starting the nitrogen displacement device 1, starting to charge nitrogen into the battery pack 4, and simultaneously starting to record the time t; specifically, the pre-charging time Tm of the battery packs 4 of different models is set according to the remaining volumes of the battery packs 4 of different models, the concentration of the protective gas, and the flow rate of the protective gas. Because the battery pack 4 is firstly bulged when thermal runaway occurs and then the pressure release valve 19 is exploded to release pressure, the value of the maximum pressure difference delta P between the inside and the outside of the battery pack 4 is determined according to the pressure difference borne by the battery pack 4 when bulging occurs.
2) Acquiring external pressure Pw of the battery pack and internal pressure Pn of the battery pack, calculating internal and external pressure difference of the battery pack, and acquiring actual nitrogen charging time Ts of the battery pack if the internal and external pressure difference of the battery pack is smaller than delta P; specifically, the pressure release valve 19 of the battery pack 4 is of a membrane structure and has a ventilation function, and protective gas is introduced into the battery pack 4, so that air in the battery pack 4 can be discharged out of the battery pack 4 through the pressure release valve 19, and therefore when the pressure difference between the inside and the outside of the battery pack 4 is smaller than delta P, the protective gas can be continuously injected into the battery pack 4 to realize replacement of the air in the battery pack 4.
3) And (3) judging whether the actual nitrogen charging time Ts of the battery pack is more than or equal to the nitrogen pre-charging time Tm of the battery pack, if so, stopping the nitrogen replacement device 1, stopping charging the nitrogen into the battery pack, finishing the one-time nitrogen charging process of the battery pack, and otherwise, returning to the step 2). Specifically, when the actual inflation time Ts of the battery pack 4 reaches Tm, it indicates that the battery pack 4 is filled with the protection gas, and the battery pack 4 completes one inflation process. The invention provides a method for controlling the charging of protective gas into a lithium ion battery pack 4 based on pressure and time parameters, which does not need to be provided with an oxygen concentration monitor, and has the advantages of low cost and long service life of equipment.
In the step 2), if the internal and external pressure difference of the battery pack is greater than or equal to delta P, the nitrogen gas replacement device 1 is stopped, the battery pack stops charging nitrogen gas, the external pressure Pw of the battery pack and the internal pressure Pn of the battery pack are collected again, the internal and external pressure difference of the battery pack is calculated, and if the internal and external pressure difference of the battery pack is greater than delta P, the system performs self-checking; otherwise, judging whether the pressure difference between the inside and the outside of the battery pack is smaller than the delta P or collecting the time Tt' for stopping filling the nitrogen into the battery pack. Specifically, when the pressure difference between the inside and the outside of the battery pack 4 reaches Δ P, the inflator needs to be stopped immediately, and the battery pack 4 stops charging the protective gas, so as to avoid the battery pack 4 from bulging due to excessive pressure. At the moment, the external pressure Pw of the battery pack 4 and the internal pressure Pn of the battery pack 4 are collected again, the internal and external pressure difference of the battery pack 4 is calculated, if the internal and external pressure difference of the battery pack 4 is larger than delta P, the pressure detector or the controller 6 is in fault, the system self-check needs to be started, fault detection is carried out on the controller 6 and the pressure detector, and fault early warning is sent out in time. If the pressure difference between the inside and the outside of the battery pack 4 is equal to or less than delta P, the pressure in the battery pack 4 is increased to delta P due to the fact that the inflating flow is large, inflating needs to be suspended, and pressure recovery of the battery pack 4 is waited. The inflation state of the battery pack 4 is judged based on the pressure parameter change, so that the battery pack 4 is ensured not to bulge in the inflation process, the use safety of the battery pack 4 is ensured, meanwhile, system faults such as the detector 7 or the controller 6 can be found in time in the inflation process, early warning reminding is sent out in time, and the judgment precision is improved.
And judging whether the pressure difference between the inside and the outside of the battery pack is smaller than delta P, if so, returning to 1), restarting the nitrogen replacement device 1, and recharging the nitrogen into the battery pack, otherwise, continuously acquiring the pressure Pw outside the battery pack and the pressure Pn inside the battery pack and judging the relation between the pressure difference between the inside and the outside of the battery pack and the delta P. Specifically, when the ventilation is stopped, the pressure difference between the inside and the outside of the battery pack 4 gradually decreases due to the ventilation function of the pressure release valve 19, and when the pressure difference between the inside and the outside of the battery pack 4 is lower than Δ P, the ventilation device can be restarted to continuously inflate the battery pack 4, so that the replacement of the air in the battery pack 4 is continuously completed.
When the time Tt 'of stopping charging the nitrogen gas by the battery pack is acquired, the control parameters in 1) further comprise the charging pause time Tz, whether the time Tt' is larger than or equal to the time Tz is judged, if yes, the control parameters are returned to 1), the nitrogen gas replacement device 1 is restarted, the nitrogen gas is charged into the battery pack again, otherwise, the time Tt 'of stopping charging the battery pack is continuously acquired, and the relation between the time Tt' and the time Tz is judged. Specifically, because the structure of the pressure release valve 19 is different, the air permeability of the pressure release valve 19 is different, and the sealing performance of different battery packs 4 is different, and the speed of pressure drop in the battery packs 4 is also different, so the inflation pause time Tz is determined according to the types of the battery packs 4 and the structure of the battery packs 4, when the sealing performance of the battery packs 4 is better and the air permeability of the pressure release valve 19 is poorer, the Tz can be set for a longer time, and when the sealing performance of the battery packs 4 is poorer and the air permeability of the pressure release valve 19 is better, the Tz can be set for a shorter time. After the ventilation Tz is stopped, the pressure in the battery pack 4 is reduced, and when the pressure difference between the inside and the outside of the battery pack 4 is smaller than delta P, the air charging device can be restarted to continuously charge air into the battery pack 4, so that the replacement of the air in the battery pack 4 is continuously completed. When the inflator is restarted and the battery pack 4 is inflated again, the actual inflation time Ts of the battery pack 4 at this time is the sum of the inflation time of the battery pack 4 before the ventilation is stopped and the inflation time of the battery pack 4 after the re-inflation.
The control parameters in the step 1) further comprise interval nitrogen charging time Tj, after the battery pack stops charging nitrogen in the step 3), acquiring the time Tt for stopping charging the battery pack, judging whether the Tt is greater than or equal to the Tj, if so, returning to the step 1), restarting the nitrogen displacement device 1, and re-charging the battery pack with nitrogen; otherwise, continuously collecting the time Tt for stopping the inflation of the battery pack and judging the relation between the Tt and the Tj. Specifically, the interval inflation time Tj is determined according to the sealing performance of the battery pack 4 and the air permeability of the pressure release valve 19, and when the sealing performance of the battery pack 4 is good and the air permeability of the pressure release valve 19 is poor, Tj can be set for a longer time, and when the sealing performance of the battery pack 4 is poor and the air permeability of the pressure release valve 19 is good, Tj can be set for a shorter time. After the air charging is stopped, the concentration of the protective gas in the battery pack 4 is gradually reduced due to the air permeability of the pressure release valve 19 and the battery pack 4, the oxygen content in the battery pack 4 is gradually increased, and the thermal runaway risk of the battery pack 4 is increased. The intermittent inflation mode can maintain the protective gas in the battery pack 4 in a higher concentration range, continuously inhibit the thermal runaway of the battery pack 4 and increase the safety of the battery pack 4.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (13)

1. The utility model provides a battery package charging system, includes the battery package and charges the cabinet, it has nitrogen gas replacement device to charge the cabinet built-in, it does to charge the cabinet the battery package provides to charge and fills nitrogen gas, its characterized in that: and an inflation protection device is arranged between the nitrogen replacement device and the battery pack and is used for automatically adjusting the inflation flow of nitrogen.
2. The battery pack charging system of claim 1, wherein: the inflation protection device comprises a controller, a flow regulating valve and a gas conveying pipeline, the nitrogen replacement device is connected with the inlet end of the gas conveying pipeline through an electromagnetic valve, the outlet end of the gas conveying pipeline is provided with a plurality of branches, the plurality of branches are connected with a plurality of battery packs through the flow regulating valve respectively, the branches correspond to the battery packs one to one, detectors are arranged in the battery packs, the detectors are used for detecting gas information in the battery packs, and the controller is electrically connected with the electromagnetic valve, the detectors and the flow regulating valve respectively.
3. The battery pack charging system of claim 2, wherein: flow control valve includes casing, flow sensor, motor, valve block and pivot, the casing divide into and holds chamber and gas passage, it is sealed cavity to hold the chamber, the motor is established and is being held the intracavity, valve block and flow sensor establish in gas passage, the motor is connected with the one end of pivot, the other end of pivot stretches into in the gas passage and is connected with the valve block, flow sensor is used for detecting the gas flow in the gas passage and carries flow information to the detector.
4. The battery pack charging system of claim 3, wherein: the valve plate and the flow sensor are sequentially arranged along the flowing direction of the gas.
5. The battery pack charging system of claim 3, wherein: the size of the cross section of the valve plate is matched with that of the cross section of the gas channel, and the rotation angle theta of the valve plate is larger than or equal to 0 degree and smaller than or equal to 90 degrees.
6. The battery pack charging system of claim 2, wherein: the detector comprises a sensor and a control module, the sensor is used for detecting gas information in the battery pack and transmitting the detected information to the controller, and the control module is used for controlling the flow regulating valve.
7. The battery pack charging system of claim 1, wherein: the charging cabinet comprises a cabinet body, a charging system and a nitrogen replacement device, wherein the charging system and the nitrogen replacement device are arranged inside the cabinet body, the charging system and the nitrogen replacement device are respectively and independently arranged, a charging interface and a nitrogen interface are respectively arranged on the side wall of the cabinet body, the charging interface is electrically connected with the charging system, the nitrogen interface is communicated with the nitrogen replacement device, the charging cabinet charges for a battery pack through the charging interface, and the charging cabinet charges for the battery pack through the nitrogen interface.
8. The battery pack charging system of claim 7, wherein: more than 1 socket is seted up on the lateral wall of the cabinet body, and the parallel arrangement has one to charge interface and 1 nitrogen gas interface in single socket.
9. A charging method of a battery pack charging system comprising the battery pack charging system according to any one of claims 1 to 8, the charging method comprising the steps of:
step 1, adding a pressure release valve, a nitrogen inlet, a charging socket, a BMS system and a detector on a battery pack of a two-wheeled vehicle or a three-wheeled vehicle;
step 2, placing the battery pack into a charging cabinet, connecting a nitrogen gas inlet and a nitrogen interface, and connecting a charging socket and a charging interface;
step 3, in a nitrogen replacing device of the charging cabinet, removing moisture of compressed air through a dryer, removing large-particle impurities of the air through a filter, and then preparing high-concentration nitrogen through a nitrogen making machine, wherein the high-concentration nitrogen flows to a nitrogen interface of each charging cabinet socket through a gas pipeline;
step 4, starting a charging system, and respectively and simultaneously charging and charging nitrogen for the battery pack in the charging cabinet; in the process of filling nitrogen, the operation method of the inflation protection device is as follows: 1) presetting control parameters: inputting the nitrogen pre-charging time Tm and the maximum pressure difference delta P inside and outside the battery pack into a controller, starting a nitrogen replacement device, starting to charge nitrogen into the battery pack, and simultaneously starting to record the time t; 2) acquiring external pressure Pw of the battery pack and internal pressure Pn of the battery pack, calculating internal and external pressure difference of the battery pack, and acquiring actual nitrogen charging time Ts of the battery pack if the internal and external pressure difference of the battery pack is smaller than delta P; 3) and (3) judging whether the actual nitrogen charging time Ts of the battery pack is more than or equal to the nitrogen pre-charging time Tm of the battery pack, if so, stopping the nitrogen replacement device, stopping charging the nitrogen into the battery pack, finishing the one-time nitrogen charging process of the battery pack, and otherwise, returning to the step 2).
10. The charging method of a battery pack charging system according to claim 9, wherein: in the step 2), if the internal and external pressure difference of the battery pack is greater than or equal to delta P, stopping the nitrogen gas replacement device, stopping filling nitrogen gas into the battery pack, acquiring the external pressure Pw of the battery pack and the internal pressure Pn of the battery pack again, calculating the internal and external pressure difference of the battery pack, and if the internal and external pressure difference of the battery pack is greater than delta P, performing self-checking on the system; otherwise, judging whether the pressure difference between the inside and the outside of the battery pack is smaller than the delta P or collecting the time Tt' for stopping filling the nitrogen into the battery pack.
11. The charging method of a battery pack charging system according to claim 10, wherein: and judging whether the pressure difference between the inside and the outside of the battery pack is smaller than delta P, if so, returning to 1), restarting the nitrogen replacement device, and recharging the nitrogen into the battery pack, otherwise, continuously acquiring the pressure Pw outside the battery pack and the pressure Pn inside the battery pack and judging the relation between the pressure difference between the inside and the outside of the battery pack and the delta P.
12. The charging method of a battery pack charging system according to claim 10, wherein: when acquiring the time Tt 'of stopping charging the nitrogen gas by the battery pack, the control parameters in 1) further comprise the charging pause time Tz, judging whether the time Tt' is greater than or equal to the time Tz, if so, returning to 1), restarting the nitrogen gas replacement device, and re-charging the nitrogen gas by the battery pack, otherwise, continuously acquiring the time Tt 'of stopping charging the nitrogen gas by the battery pack and judging the relation between the time Tt' and the time Tz.
13. The charging method of a battery pack charging system according to claim 9, wherein: the control parameters in the step 1) further comprise interval nitrogen charging time Tj, after the battery pack stops charging nitrogen in the step 3), acquiring the time Tt for stopping charging the battery pack, judging whether the Tt is greater than or equal to the Tj, if so, returning to the step 1), restarting the nitrogen displacement device, and re-charging the battery pack with nitrogen; otherwise, continuously collecting the time Tt for stopping the inflation of the battery pack and judging the relation between the Tt and the Tj.
CN202110705172.9A 2021-05-20 2021-06-24 Battery pack charging system and charging method thereof Pending CN113541243A (en)

Priority Applications (5)

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CN202110705172.9A CN113541243A (en) 2021-06-24 2021-06-24 Battery pack charging system and charging method thereof
US17/490,994 US20220376516A1 (en) 2021-05-20 2021-09-30 Battery pack charging system and charging method thereof
KR1020210134421A KR102606913B1 (en) 2021-05-20 2021-10-08 Battery pack charging system and charging method thereof
EP21201877.4A EP4091862A1 (en) 2021-05-20 2021-10-11 Battery pack charging system and charging method thereof
JP2021166697A JP7260927B2 (en) 2021-05-20 2021-10-11 Battery pack charging system and charging method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114407697A (en) * 2022-03-14 2022-04-29 深圳康普盾科技股份有限公司 Battery charging cabinet based on Internet of things and control method thereof
CN114825520A (en) * 2022-04-14 2022-07-29 福建云一科技有限公司 Honeycomb charging cabinet and charging method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114407697A (en) * 2022-03-14 2022-04-29 深圳康普盾科技股份有限公司 Battery charging cabinet based on Internet of things and control method thereof
CN114825520A (en) * 2022-04-14 2022-07-29 福建云一科技有限公司 Honeycomb charging cabinet and charging method thereof
CN114825520B (en) * 2022-04-14 2023-10-13 福建云一科技有限公司 Honeycomb charging cabinet and charging method thereof

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