CN113078404A - Battery pack safety protection system and method - Google Patents
Battery pack safety protection system and method Download PDFInfo
- Publication number
- CN113078404A CN113078404A CN202011185440.0A CN202011185440A CN113078404A CN 113078404 A CN113078404 A CN 113078404A CN 202011185440 A CN202011185440 A CN 202011185440A CN 113078404 A CN113078404 A CN 113078404A
- Authority
- CN
- China
- Prior art keywords
- gas
- battery pack
- gas supply
- safety protection
- sensor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003063 flame retardant Substances 0.000 claims abstract description 75
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims description 289
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 50
- 229910052757 nitrogen Inorganic materials 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 18
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 18
- 239000005416 organic matter Substances 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000012528 membrane Substances 0.000 description 6
- 238000007605 air drying Methods 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- 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
Abstract
The invention relates to a battery pack safety protection system and a battery pack safety protection method. Battery package safety protection system includes: the gas source device is used for supplying flame-retardant gas to the battery pack; the gas supply gas circuit is connected between the gas source device and the battery pack; the gas supply gas circuit is provided with a gas supply control valve which enables the gas supply gas circuit to have a normal state and an emergency state, and the available gas supply flow in the emergency state is larger than the available gas supply flow in the normal state; the battery pack comprises a gas leakage detection device and/or a thermal runaway detection device, wherein the gas leakage detection device is used for detecting the gas leakage condition in the battery pack, and the thermal runaway detection device is used for detecting whether thermal runaway occurs or is about to occur in the battery pack; and the control device is connected with the gas supply control valve, is connected with the gas leakage detection device and/or the thermal runaway detection device and is used for controlling the switching of the normal state and the emergency state of the gas supply gas circuit. The problem that the safety protection performance of the existing battery pack safety protection system is limited is solved by the scheme.
Description
Technical Field
The invention relates to a battery pack safety protection system and a battery pack safety protection method.
Background
With the popularization of new energy vehicles in the market, ignition and combustion accidents of new energy vehicles frequently occur in recent years, batteries are used as core components of the new energy vehicles, and the safety of the batteries is more and more important. The inside of a common battery pack is in an air environment, namely an air atmosphere, and due to the fact that oxygen exists in the air, when the power battery is in abuse or accident and other extreme working conditions, electrolyte leakage and ignition arc discharge can occur, and safety accidents such as ignition, combustion and explosion can occur in the oxygen-existing environment.
Some battery packs in the prior art adopt a technical scheme of replacing internal gas with inert gas, for example, a battery box filled with flame retardant gas disclosed in chinese patent publication No. CN208256783U, in which the gas in the battery pack is replaced with flame retardant gas through an inlet and an outlet provided with a stop valve, and a bidirectional air pressure balance valve is provided on the battery pack, and the bidirectional air pressure balance valve is an explosion-proof balance valve, so that the battery pack can realize internal and external pressure balance in different temperature environments, and can be decompressed by self-destruction when the internal and external pressure difference reaches a certain limit value, thereby realizing explosion prevention.
However, under some working conditions, the case of the battery pack may be damaged by opening to cause gas leakage, for example, when the battery pack is out of control due to thermal runaway, an electric arc may easily occur in an electrical component, the electric arc may burn through the case of the battery pack to cause damage by opening, or when the battery pack is subjected to an external force, the flame retardant protection function of the flame retardant gas may be lost. Therefore, the safety protection performance of the existing battery pack safety protection system is limited.
Disclosure of Invention
The invention aims to provide a battery pack safety protection system, which solves the problem that the safety protection performance of the existing battery pack safety protection system is limited; meanwhile, the application also provides a battery pack safety protection method which can improve the safety protection performance of a battery pack safety protection system.
The battery pack safety protection system adopts the following technical scheme:
battery package safety protection system includes:
the battery pack is used for accommodating the battery module;
the gas source device is used for supplying flame-retardant gas to the battery pack;
the gas supply gas circuit is connected between the gas source device and the battery pack; the gas supply gas circuit is provided with a gas supply control valve which enables the gas supply gas circuit to have a normal state and an emergency state, and the available gas supply flow in the emergency state is larger than the available gas supply flow in the normal state;
the battery pack comprises a gas leakage detection device and/or a thermal runaway detection device, wherein the gas leakage detection device is used for detecting the gas leakage condition in the battery pack, and the thermal runaway detection device is used for detecting whether thermal runaway occurs or is about to occur in the battery pack;
and the control device is connected with the gas supply control valve and is connected with the gas leakage detection device and/or the thermal runaway detection device.
Has the advantages that: adopt above-mentioned technical scheme, can make the air feed gas circuit have normality state and emergency state through control air feed control valve, but air feed flow under the emergency state is greater than the air feed flow under the normality state, can make the battery module still can rely on flame retardant gas to be in relative safe state when the openness damage appears in the battery package and produce gas leakage, reduce or avoid oxygen to cause the battery module to appear further thermal runaway or burning, the explosion problem, under the condition of the security performance under the assurance battery package normality state, can also realize the safety protection of battery package under the emergency state, whole safety protection performance has been improved.
As a preferred technical scheme: the gas leakage detection device comprises a flame-retardant gas concentration sensor, a gas pressure sensor and/or an oxygen concentration sensor which are arranged in the battery pack;
and the flame-retardant gas concentration sensor, the gas pressure sensor and/or the oxygen concentration sensor are/is connected with the control device.
Has the advantages that: the flame-retardant gas concentration sensor, the gas pressure sensor and/or the oxygen concentration sensor can be flexibly selected and combined, and the gas leakage detection requirement can be conveniently met.
As a preferred technical scheme: the thermal runaway detection device comprises a temperature sensor, a carbon monoxide sensor, an organic matter sensor and/or a gas pressure sensor;
the temperature sensor is used for detecting the temperature of the battery module, the carbon monoxide sensor is used for detecting carbon monoxide in the battery pack, the organic matter sensor is used for detecting organic matters in the battery pack, and the gas pressure sensor is used for detecting the gas pressure in the battery pack;
and the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor are/is connected with the control device.
Has the advantages that: the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor can be flexibly selected and combined, and the thermal runaway detection requirement can be conveniently met.
As a preferred technical scheme: the gas supply circuit comprises:
a normal gas path, on which a normal gas path on-off valve is arranged;
the emergency gas circuit is connected with the normal gas circuit in parallel and is provided with an emergency gas circuit on-off valve;
the air supply control valve is composed of the normal air path on-off valve and the emergency on-off valve.
Has the advantages that: by adopting the technical scheme, the normal state and the emergency state of the gas supply gas circuit can be conveniently switched by arranging the normal state gas circuit and the emergency gas circuit, the structure is simple, and the control is convenient.
As a preferred technical scheme: and the normal gas path is provided with a pressure control valve for supplying flame-retardant gas with set pressure to the battery pack.
Has the advantages that: by adopting the technical scheme, the safety risk caused by overlarge air pressure in the battery pack and exceeding the bearable pressure of the battery pack box body can be avoided.
As a preferred technical scheme: an emergency gas circuit pressure reducing valve is arranged on the emergency gas circuit.
Has the advantages that: adopt above-mentioned technical scheme can be greater than the pressure that can bear of battery module through the set pressure with the relief pressure valve, rely on flame retardant gas to exert better oxygen separation effect under emergency state, improve barrier propterty.
As a preferred technical scheme: the air supply control valve is an independent adjustable valve which is used for adjusting the pressure and the flow of air supply.
Has the advantages that: by adopting the technical scheme, the number of parts is reduced, and the structure is compact.
As a preferred technical scheme: an air distribution pipe is arranged in the battery pack and is communicated with an air supply path; the gas distribution pipe is provided with a gas distribution port for discharging the flame-retardant gas into the battery pack from the gas distribution port.
Has the advantages that: by adopting the technical scheme, the battery pack is beneficial to effective discharge of gas in the battery pack, and the flame-retardant gas environment in the battery pack is better ensured.
As a preferred technical scheme: the air source device comprises a whole vehicle air compressor, an air drying device, an oil-gas separator, nitrogen separation equipment and an air storage tank which are arranged along an air supply path, wherein the nitrogen separation equipment is used for separating nitrogen from air.
Has the advantages that: by adopting the technical scheme, the flame-retardant gas can be manufactured and stored in real time, and the flame-retardant gas does not need to be replaced regularly.
As a preferred technical scheme: the air source device also comprises a standby air pump, and the standby air pump is connected with the whole vehicle air compressor in parallel; the spare air pump is connected with the control device and is only used for supplying air to the battery pack.
Has the advantages that: by adopting the technical scheme, the battery pack can be monitored for 24 hours, energy waste caused by starting of the whole air compressor is avoided, and the safety risk that the battery pack is out of thermal runaway after the whole vehicle is powered off or when the whole vehicle is placed for a long time is reduced.
The battery pack safety protection method adopts the following technical scheme:
the safety protection method for the battery pack comprises the following steps:
detecting whether gas leakage occurs in the battery pack and/or detecting whether thermal runaway occurs or is about to occur in the battery pack;
step two, when no gas leakage occurs and no thermal runaway occurs or thermal runaway is about to occur, controlling a gas supply control valve on a gas supply path through a control device to enable the gas supply path to be in a normal state; when gas leakage occurs and/or thermal runaway occurs or is about to occur, controlling a gas supply control valve on a gas supply path through a control device to enable the gas supply path to be in an emergency state;
the available air flow under the emergency state is larger than the available air flow under the normal state.
Has the advantages that: adopt above-mentioned technical scheme, can make the air feed gas circuit have normality state and emergency state through control air feed control valve, but air feed flow under the emergency state is greater than the air feed flow under the normality state, can make the battery module still can rely on flame retardant gas to be in relative safe state when the openness damage appears in the battery package and produce gas leakage, reduce or avoid oxygen to cause the battery module to appear further thermal runaway or burning, the explosion problem, under the condition of the security performance under the assurance battery package normality state, can also realize the safety protection of battery package under the emergency state, whole safety protection performance has been improved.
As a preferred technical scheme: in a normal state, the concentration of the flame-retardant gas in the battery pack is detected by a flame-retardant gas concentration sensor, the pressure of the flame-retardant gas in the battery pack is detected by a gas pressure sensor, and/or the concentration of the oxygen gas in the battery pack is detected by an oxygen concentration sensor, and when the concentration of the flame-retardant gas and/or the pressure of the flame-retardant gas is less than a set value or the concentration of the oxygen gas is greater than the set value, the flame-retardant gas is supplemented to the battery pack.
Has the advantages that: the flame-retardant gas concentration sensor, the gas pressure sensor and/or the oxygen concentration sensor can be flexibly selected and combined, and the gas leakage detection requirement can be conveniently met.
As a preferred technical scheme: the thermal runaway detection device comprises a temperature sensor, a carbon monoxide sensor, an organic matter sensor and/or a gas pressure sensor;
the temperature sensor is used for detecting the temperature of the battery module, the carbon monoxide sensor is used for detecting carbon monoxide in the battery pack, the organic matter sensor is used for detecting organic matters in the battery pack, and the gas pressure sensor is used for detecting the gas pressure in the battery pack;
and the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor are/is connected with the control device.
Has the advantages that: the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor can be flexibly selected and combined, and the thermal runaway detection requirement can be conveniently met.
As a preferred technical scheme: the gas supply circuit comprises:
a normal gas path, on which a normal gas path on-off valve is arranged;
the emergency gas circuit is connected with the normal gas circuit in parallel and is provided with an emergency gas circuit on-off valve;
the air supply control valve is composed of the normal air path on-off valve and the emergency on-off valve.
Has the advantages that: by adopting the technical scheme, the normal state and the emergency state of the gas supply gas circuit can be conveniently switched by arranging the normal state gas circuit and the emergency gas circuit, the structure is simple, and the control is convenient.
As a preferred technical scheme: and the normal gas path is provided with a pressure control valve for supplying flame-retardant gas with set pressure to the battery pack.
Has the advantages that: by adopting the technical scheme, the safety risk caused by overlarge air pressure in the battery pack and exceeding the bearable pressure of the battery pack box body can be avoided.
As a preferred technical scheme: an emergency gas circuit pressure reducing valve is arranged on the emergency gas circuit.
Has the advantages that: by adopting the technical scheme, the better oxygen blocking effect can be exerted by the flame-retardant gas in an emergency state, and the protective performance is improved.
As a preferred technical scheme: the air supply control valve is an independent adjustable valve which is used for adjusting the pressure and the flow of air supply.
Has the advantages that: by adopting the technical scheme, the number of parts is reduced, and the structure is compact.
As a preferred technical scheme: an air distribution pipe is arranged in the battery pack and is communicated with an air supply path; the gas distribution pipe is provided with a gas distribution port for discharging the flame-retardant gas into the battery pack from the gas distribution port.
Has the advantages that: by adopting the technical scheme, the battery pack is beneficial to effective discharge of gas in the battery pack, and the flame-retardant gas environment in the battery pack is better ensured.
As a preferred technical scheme: the air source device comprises a whole vehicle air compressor, an air drying device, an oil-gas separator, nitrogen separation equipment and an air storage tank which are arranged along an air supply path, wherein the nitrogen separation equipment is used for separating nitrogen from air.
Has the advantages that: by adopting the technical scheme, the flame-retardant gas can be manufactured and stored in real time, and the flame-retardant gas does not need to be replaced regularly.
As a preferred technical scheme: the air source device also comprises a standby air pump, and the standby air pump is connected with the whole vehicle air compressor in parallel; the standby air pump is connected with the control device; after the whole vehicle is powered off or is placed for a long time, the gas leakage condition in the battery pack is periodically detected, and the battery pack is supplied with gas by a standby gas pump.
Has the advantages that: by adopting the technical scheme, the battery pack can be monitored for 24 hours, energy waste caused by starting of the whole air compressor is avoided, and the safety risk that the battery pack is out of thermal runaway after the whole vehicle is powered off or when the whole vehicle is placed for a long time is reduced.
For the subject to be protected by the present patent, each preferred technical solution under the same subject may be adopted alone, and when the preferred technical solutions under the same subject can be combined, two or more preferred technical solutions under the same subject may be arbitrarily combined, and the technical solutions formed by the combination are not specifically described here, and are included in the description of the present patent in this form.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a battery pack safety protection system according to the present invention;
fig. 2 is a schematic structural view of the battery pack of fig. 1;
FIG. 3 is a control logic diagram of the battery pack safety protection system of FIG. 1;
FIG. 4 is a schematic structural diagram of a second embodiment of a battery pack safety protection system according to the present invention;
the names of the components corresponding to the corresponding reference numerals in the drawings are: 1-box, 2-battery module, 3-air inlet, 4-air outlet, 5-air distribution pipe and 6-flame retardant gas sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
As shown in fig. 1 and 2, the battery pack safety protection system comprises a battery pack, an air supply device and a control device. The battery pack is used for accommodating a battery module 2, and the structure is as shown in fig. 2, and comprises a box body 1, wherein the box body 1 is provided with an air inlet 3 and an air outlet 4, gas channels are arranged between the battery modules 2 and the inner wall of the box body 1, a gas distribution pipe 5 is arranged in the gas channels, and a flame-retardant gas sensor 6 is also arranged in the box body 1. The gas source device is connected with the gas inlet 3 of the battery pack through a gas supply path and is used for supplying flame-retardant gas to the battery pack. The control device comprises a BMS (battery management system) and a vehicle control unit and is used for controlling the battery pack safety protection system.
The air source device is shown in fig. 1 and comprises a whole vehicle air compressor, an air drying device (comprising a condenser and a dryer), a first air storage tank, an oil-gas separator, nitrogen separation equipment and a second air storage tank, wherein the whole vehicle air compressor, the air drying device, the first air storage tank, the oil-gas separator, the nitrogen separation equipment and the second air storage tank are arranged along an air supply path, the condenser is used for realizing condensation drying, and the nitrogen separation equipment adopts a nitrogen separation membrane and. After compressed air output by the whole vehicle air compressor is processed, dry and pure high-pressure air is made into nitrogen after passing through a nitrogen separation membrane, the nitrogen is stored in a second air storage tank and used for supplying the nitrogen to a battery pack, and the nitrogen is used as flame retardant gas. The pressure of compressed air output by the air compressor of the whole vehicle is about 10bar, and the selected nitrogen separation membrane needs to be matched with the pressure of the output compressed air. The quality of the gas affects the service life of the nitrogen separation membrane, so that equipment such as a condenser, a dryer, a filter and the like or a combination of equipment is added before the nitrogen separation membrane to filter the air. The requirement of flame retardant gas is dry and clean gas, the problem of condensation inside a battery system can be solved by the dry gas, and the clean gas can avoid other risks caused by foreign matters in the battery pack. Of course, in other embodiments, other flame retardant gases may be selected, and the structure before the filter and the nitrogen separation device may be directly a pre-charged gas storage tank pre-charged with the flame retardant gas, at which time the flame retardant gas in the pre-charged gas storage tank is periodically replenished.
The air supply air path is connected between the air source device and the battery pack and comprises a normal air path and an emergency air path.
The normal gas circuit is used for supplementing nitrogen in the battery pack and keeping the interior of the box body 1 in a flame-retardant gas environment. Because the air pressure of the compressor of the whole vehicle is higher, if the air pressure is a, the battery pack cannot be directly used, and the normal working bearable pressure of the battery pack is b, the model of a pressure reducing valve is a-b; if no pressure reducing valve with a proper type is arranged, the flow can be further limited by matching with a throttle valve to control the air supply pressure of the battery pack not to exceed b, and the normal air path is closed after the pressure reaches b. In other embodiments, the pressure in the battery pack can be kept not to exceed b by a pulse inflation mode while the pressure in the battery pack is detected, and after the pulse inflation is completed, the pressure in the battery pack reaches a set value, and the inflation is stopped. In this embodiment, a normal air passage on-off valve, a normal air passage pressure reducing valve and a throttle valve are arranged on the normal air passage, the normal air passage pressure reducing valve and the throttle valve form a pressure control valve for supplying the flame-retardant gas with a set pressure value to the battery pack, and the normal air passage on-off valve is an electromagnetic valve.
The emergency air path is connected with the normal air path in parallel, an emergency air path on-off valve and an emergency air path pressure reducing valve are arranged on the emergency air path, and the emergency air path on-off valve is an electromagnetic valve. After the box 1 of battery package appeared revealing, opened through emergent gas circuit break-make valve this moment, made emergent gas circuit open, increaseed the fire-retardant gas input, realized the effect of separation oxygen. The emergency air path pressure reducing valve is not limited to the pressure which can be borne by the battery during working, the main purpose of blocking oxygen is to prevent the battery pack from leaking gas, and a slightly larger air pressure can be selected.
The normal gas path on-off valve and the emergency on-off valve form a gas supply control valve, so that the gas supply path has a normal state and an emergency state; the emergency gas circuit on-off valve is kept open, and the normal gas circuit on-off valve is kept open; obviously, the suppliable air flow rate in the emergency state is larger than the suppliable air flow rate in the normal state.
In other embodiments, the normal gas path and the emergency gas path may also be combined, as shown in fig. 4, a single adjustable valve is used to adjust the opening degree to control the pressure and flow rate of the gas supply, the normal and emergency functions are switched by controlling the adjustable valve, the adjustable valve is controlled to have a smaller gas flow rate when the normal state works, and the opening degree of the adjustable valve is adjusted to increase the flow rate when the sensor in the battery box detects that the battery is out of control due to thermal runaway or is about to occur due to thermal runaway.
In this embodiment, the air inlet 3 and the air outlet 4 are always connected by an air path connector, the air supply air path continuously supplies flame-retardant gas to the battery pack, the flame-retardant gas enters the battery pack from the air inlet 3, the battery pack is fully charged by the air distribution pipe 5 in the battery pack, and the redundant flame-retardant gas is discharged from the battery pack through the air outlet 4 of the battery pack. The gas distribution pipe 5 is connected with the gas inlet 3, the most effective distribution path of the flame-retardant gas entering the battery pack from the gas inlet 3 is calculated by using fluid simulation software, gas distribution ports are arranged at key nodes of the distribution path, and residual oxygen in the battery pack is timely and effectively discharged from the gas outlet 4. The dispersion pipe is an unnecessary component and can be adjusted according to actual conditions. In addition, the structural forms of the air inlet 3 and the air outlet 4 are not limited, and the air outlet 4 can be replaced by an explosion-proof valve/balance valve and the like.
The flame-retardant gas sensor 6 is connected to the BMS using a flame-retardant gas concentration sensor and/or a gas pressure sensor, and continuously monitors the flame-retardant gas concentration and/or the gas pressure in the battery pack. The linkage control of the BMS and the vehicle control unit can be realized through the flame-retardant gas sensor 6 in the battery pack, and the concentration or the pressure value of the flame-retardant gas in the battery pack can be monitored in real time. For the condition that a plurality of battery packs are arranged on the vehicle, when the content of flame-retardant gas in one battery pack or the pressure value X is less than or equal to A%, the control device fills the flame-retardant gas in the battery pack by opening the normal gas path on-off valve, and when the content of the flame-retardant gas in all the battery packs or the gas pressure X (1, 2 …) is greater than or equal to B%, the normal gas path on-off valve is closed, and the flame-retardant gas is stopped from being filled in the battery pack. A. The value of B is acquired through test verification, and B is greater than A. And then, the pressure change in the battery pack can be continuously monitored, and an alarm is given when the pressure change is abnormal to prompt maintenance. In order to realize the control of each battery pack, a normal air path on-off valve can be additionally arranged on each branch entering each battery pack to realize single-branch control.
When being provided with gas pressure sensor in the battery package, but the real-time detection battery package internal pressure changes, and gas pressure B has a change curve to A in the package under normal condition, and whether the accessible detects battery package gas tightness unusual that the accessible detects pressure variation, realizes the gas tightness of battery package full life cycle and detects.
Meanwhile, the flame retardant gas concentration sensor and/or the gas pressure sensor constitute a gas leakage detecting means, and if the case 1 of the battery pack leaks, the flame retardant gas concentration and the gas pressure will drop, and therefore, the flame retardant gas concentration sensor and/or the gas pressure sensor can be used for detecting the gas leakage condition in the battery pack.
The battery pack safety protection system also comprises a thermal runaway detection device, wherein the thermal runaway detection device comprises a temperature sensor, a carbon monoxide sensor, an organic matter sensor and/or a gas pressure sensor; the temperature sensor is used for detecting the temperature of the battery module 2, the carbon monoxide sensor is used for detecting carbon monoxide in the battery pack, the organic matter sensor is used for detecting organic matters in the battery pack, and the gas pressure sensor is used for detecting the gas pressure in the battery pack; and the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor are/is connected with the control device.
The operation process comprises the following steps:
after the high-pressure gas of the whole vehicle air compressor is treated, nitrogen is produced through a nitrogen separation membrane and stored in a second gas storage tank. As shown in fig. 3, according to the detection conditions of the gas leakage detection device and the thermal runaway detection device, in a normal operating mode, that is, when no gas leakage occurs and no thermal runaway occurs or thermal runaway is about to occur, whether to introduce the flame retardant gas into the battery pack is determined according to the flame retardant gas concentration and/or the gas pressure detected by the flame retardant gas concentration sensor and/or the gas pressure sensor, and when the flame retardant gas is required to be introduced, the normal gas path on-off valve is opened to keep the low-oxygen or oxygen-free environment in the battery pack. Certainly, because the air outlet 4 is always in a communicated state, when the air exhaust capacity of the air outlet 4 is large, the air supply path needs to keep supplying air all the time, and at the moment, a normal air path on-off valve can be omitted; when the exhaust capacity of the air outlet 4 is small, the air supply path supplies air intermittently.
According to the detection conditions of the gas leakage detection device and the thermal runaway detection device, if gas leakage occurs and/or thermal runaway occurs or is about to occur, at the moment, the risk that oxygen enters the battery pack exists, the system enters an emergency working mode, the control device controls the normal gas path on-off valve and the emergency gas path on-off valve to be kept open simultaneously, the input of flame retardant gas is increased, oxygen is blocked, and the functions of blocking flame or extinguishing fire are achieved. Meanwhile, the control device can control the corresponding alarm device to give an alarm to passengers and drivers, so as to prompt evacuation and maintenance.
After the whole vehicle of vehicle is powered off, or when shelving for a long time, the whole vehicle controller of accessible awakens up BMS regularly, monitors the data of the flame retardant gas sensor 6 in the battery package, if need fill flame retardant gas for the battery package, the stand-by gas pump work of accessible 24V carries out flame retardant gas through the normal state gas circuit on-off valve and fills the battery package.
In the above embodiment, the gas supply circuit includes a normal circuit and an emergency circuit, and the gas supply control valve includes a normal circuit on-off valve and an emergency circuit on-off valve; in other embodiments, more than three on-off valves can be arranged, and when all the on-off valves are opened, the air supply path is in an emergency state, and when part of the on-off valves are opened, the air supply path is in a normal state.
In the above embodiment, the battery pack is provided with the gas outlet 4, and the flame retardant gas exhausts oxygen in the battery pack through the gas outlet 4; in the present embodiment, the case 1 of the battery pack is of a sealed structure, and at this time, oxygen in the battery pack can be replaced by repeatedly evacuating the gas inlet 3 and filling the flame retardant gas.
In the above embodiment, the gas leak detection device includes a flame-retardant gas concentration sensor and a gas pressure sensor provided in the battery pack; in the present embodiment, the gas leak detection device uses an oxygen concentration sensor, or uses any two or three of an oxygen concentration sensor, a flame retardant gas concentration sensor, and a gas pressure sensor.
The embodiment of the battery pack safety protection method in the invention comprises the following steps: the embodiment of the battery pack safety protection method, that is, the method for using the battery pack safety protection system, may refer to the above operation manner of the battery pack safety protection system, and will not be described in detail here. Of course, in other embodiments of the battery pack safety protection method, a gas storage tank pre-charged with flame retardant gas may be used, and an adjustable valve may be used to control the gas supply flow rate in the normal state and the emergency state.
The above description is only a preferred embodiment of the present application, and not intended to limit the present application, the scope of the present application is defined by the appended claims, and all changes in equivalent structure made by using the contents of the specification and the drawings of the present application should be considered as being included in the scope of the present application.
Claims (10)
1. Battery package safety protection system, its characterized in that includes:
the battery pack is used for accommodating the battery module;
the gas source device is used for supplying flame-retardant gas to the battery pack;
the gas supply gas circuit is connected between the gas source device and the battery pack; the gas supply gas circuit is provided with a gas supply control valve which enables the gas supply gas circuit to have a normal state and an emergency state, and the available gas supply flow in the emergency state is larger than the available gas supply flow in the normal state;
the battery pack comprises a gas leakage detection device and/or a thermal runaway detection device, wherein the gas leakage detection device is used for detecting the gas leakage condition in the battery pack, and the thermal runaway detection device is used for detecting whether thermal runaway occurs or is about to occur in the battery pack;
and the control device is connected with the gas supply control valve and is connected with the gas leakage detection device and/or the thermal runaway detection device.
2. The battery pack safety protection system according to claim 1, wherein the gas leakage detection device comprises a flame retardant gas concentration sensor, a gas pressure sensor and/or an oxygen concentration sensor disposed inside the battery pack;
and the flame-retardant gas concentration sensor, the gas pressure sensor and/or the oxygen concentration sensor are/is connected with the control device.
3. The battery pack safety protection system according to claim 1, wherein the thermal runaway detection device comprises a temperature sensor, a carbon monoxide sensor, an organic matter sensor, and/or a gas pressure sensor;
the temperature sensor is used for detecting the temperature of the battery module, the carbon monoxide sensor is used for detecting carbon monoxide in the battery pack, the organic matter sensor is used for detecting organic matters in the battery pack, and the gas pressure sensor is used for detecting the gas pressure in the battery pack;
and the temperature sensor, the carbon monoxide sensor, the organic matter sensor and/or the gas pressure sensor are/is connected with the control device.
4. The battery pack safety protection system according to any one of claims 1 to 3, wherein the gas supply path comprises:
a normal gas path, on which a normal gas path on-off valve is arranged;
the emergency gas circuit is connected with the normal gas circuit in parallel and is provided with an emergency gas circuit on-off valve;
the air supply control valve is composed of the normal air path on-off valve and the emergency on-off valve.
5. The battery pack safety protection system according to claim 4, wherein a pressure control valve is arranged on the normal gas path and used for supplying flame retardant gas with set pressure to the battery pack.
6. The battery pack safety protection system of claim 4, wherein an emergency gas path pressure relief valve is provided on the emergency gas path.
7. The battery pack safety protection system according to any one of claims 1 to 3, wherein the gas supply control valve is a single adjustable valve for adjusting the pressure and flow rate of the gas supply.
8. The battery pack safety protection system according to any one of claims 1 to 3, wherein a gas distribution pipe is arranged in the battery pack and is communicated with a gas supply path; the gas distribution pipe is provided with a gas distribution port for discharging the flame-retardant gas into the battery pack from the gas distribution port.
9. The battery pack safety protection system according to any one of claims 1 to 3, wherein the gas source device comprises a vehicle air compressor, a gas drying device, an oil-gas separator, a nitrogen separation device and a gas storage tank arranged along a gas supply path, and the nitrogen separation device is used for separating nitrogen from air.
10. The safety protection method of the battery pack is characterized by comprising the following steps:
the method comprises the following steps: detecting whether gas leakage occurs in the battery pack and/or detecting whether thermal runaway or imminent thermal runaway occurs in the battery pack;
step two: when no gas leakage occurs and no thermal runaway occurs or thermal runaway is about to occur, controlling a gas supply control valve on a gas supply path through a control device to enable the gas supply path to be in a normal state; when gas leakage occurs and/or thermal runaway occurs or is about to occur, controlling a gas supply control valve on a gas supply path through a control device to enable the gas supply path to be in an emergency state;
the available air flow under the emergency state is larger than the available air flow under the normal state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185440.0A CN113078404A (en) | 2020-10-29 | 2020-10-29 | Battery pack safety protection system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185440.0A CN113078404A (en) | 2020-10-29 | 2020-10-29 | Battery pack safety protection system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113078404A true CN113078404A (en) | 2021-07-06 |
Family
ID=76609127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011185440.0A Pending CN113078404A (en) | 2020-10-29 | 2020-10-29 | Battery pack safety protection system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113078404A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578226A (en) * | 2021-09-08 | 2021-11-02 | 安徽芯核防务装备技术股份有限公司 | Inert gas protection system |
| CN114053625A (en) * | 2021-09-24 | 2022-02-18 | 国网河北省电力有限公司电力科学研究院 | Lithium ion battery safety transport vechicle based on liquid nitrogen |
| CN114759309A (en) * | 2021-10-15 | 2022-07-15 | 杰锋汽车动力系统股份有限公司 | Power battery thermal runaway passive safety system |
| CN115377586A (en) * | 2022-07-22 | 2022-11-22 | 北京合康新能科技股份有限公司 | Box body assembly, energy storage device and control method and control device of energy storage device |
| CN114759309B (en) * | 2021-10-15 | 2024-05-03 | 杰锋汽车动力系统股份有限公司 | Passive safety system for thermal runaway of power battery |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203536487U (en) * | 2013-10-11 | 2014-04-09 | 中航锂电（洛阳）有限公司 | Inerting battery box |
| CN204077400U (en) * | 2014-08-21 | 2015-01-07 | 中航锂电（洛阳）有限公司 | A kind of parallel connection type air operated control electrokinetic cell system |
| CN104300097A (en) * | 2014-06-24 | 2015-01-21 | 中航锂电（洛阳）有限公司 | Flame retardant battery box and flame retardant power battery system |
| CN205231142U (en) * | 2015-12-24 | 2016-05-11 | 周哲明 | Fire -retardant device of battery energy storage system |
| CN205488418U (en) * | 2015-11-15 | 2016-08-17 | 深圳市沃特玛电池有限公司 | Control by temperature change circulation system of battery box |
| CN206045225U (en) * | 2016-08-26 | 2017-03-29 | 成都零度创唯科技有限公司 | A kind of electric motor coach lithium battery for automobile power case fire prevention and control system |
| CN106785182A (en) * | 2015-11-23 | 2017-05-31 | 宁德时代新能源科技股份有限公司 | Battery pack |
| US20180062210A1 (en) * | 2016-08-30 | 2018-03-01 | Samsung Sdi Co., Ltd. | Battery management system |
| CN107871836A (en) * | 2017-12-21 | 2018-04-03 | 张家港清研再制造产业研究院有限公司 | A kind of lithium-ion battery systems safety protection device and method |
| CN208256783U (en) * | 2018-03-29 | 2018-12-18 | 中信国安盟固利动力科技有限公司 | It is a kind of fill anti-flammability gas, degree of protection meets the battery pack of IP67 or more |
| CN210403815U (en) * | 2019-08-02 | 2020-04-24 | 东莞塔菲尔新能源科技有限公司 | Battery box with safety protection system |
| CN111092269A (en) * | 2020-01-06 | 2020-05-01 | 烟台创为新能源科技有限公司 | Explosion suppression device and method for lithium ion battery box |
| CN111509321A (en) * | 2019-01-30 | 2020-08-07 | 北京新能源汽车股份有限公司 | Battery pack system, battery pack air tightness detection method and electric automobile |
-
2020
- 2020-10-29 CN CN202011185440.0A patent/CN113078404A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203536487U (en) * | 2013-10-11 | 2014-04-09 | 中航锂电（洛阳）有限公司 | Inerting battery box |
| CN104300097A (en) * | 2014-06-24 | 2015-01-21 | 中航锂电（洛阳）有限公司 | Flame retardant battery box and flame retardant power battery system |
| CN204077400U (en) * | 2014-08-21 | 2015-01-07 | 中航锂电（洛阳）有限公司 | A kind of parallel connection type air operated control electrokinetic cell system |
| CN205488418U (en) * | 2015-11-15 | 2016-08-17 | 深圳市沃特玛电池有限公司 | Control by temperature change circulation system of battery box |
| CN106785182A (en) * | 2015-11-23 | 2017-05-31 | 宁德时代新能源科技股份有限公司 | Battery pack |
| CN205231142U (en) * | 2015-12-24 | 2016-05-11 | 周哲明 | Fire -retardant device of battery energy storage system |
| CN206045225U (en) * | 2016-08-26 | 2017-03-29 | 成都零度创唯科技有限公司 | A kind of electric motor coach lithium battery for automobile power case fire prevention and control system |
| US20180062210A1 (en) * | 2016-08-30 | 2018-03-01 | Samsung Sdi Co., Ltd. | Battery management system |
| CN107871836A (en) * | 2017-12-21 | 2018-04-03 | 张家港清研再制造产业研究院有限公司 | A kind of lithium-ion battery systems safety protection device and method |
| CN208256783U (en) * | 2018-03-29 | 2018-12-18 | 中信国安盟固利动力科技有限公司 | It is a kind of fill anti-flammability gas, degree of protection meets the battery pack of IP67 or more |
| CN111509321A (en) * | 2019-01-30 | 2020-08-07 | 北京新能源汽车股份有限公司 | Battery pack system, battery pack air tightness detection method and electric automobile |
| CN210403815U (en) * | 2019-08-02 | 2020-04-24 | 东莞塔菲尔新能源科技有限公司 | Battery box with safety protection system |
| CN111092269A (en) * | 2020-01-06 | 2020-05-01 | 烟台创为新能源科技有限公司 | Explosion suppression device and method for lithium ion battery box |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578226A (en) * | 2021-09-08 | 2021-11-02 | 安徽芯核防务装备技术股份有限公司 | Inert gas protection system |
| CN114053625A (en) * | 2021-09-24 | 2022-02-18 | 国网河北省电力有限公司电力科学研究院 | Lithium ion battery safety transport vechicle based on liquid nitrogen |
| CN114759309A (en) * | 2021-10-15 | 2022-07-15 | 杰锋汽车动力系统股份有限公司 | Power battery thermal runaway passive safety system |
| CN114759309B (en) * | 2021-10-15 | 2024-05-03 | 杰锋汽车动力系统股份有限公司 | Passive safety system for thermal runaway of power battery |
| CN115377586A (en) * | 2022-07-22 | 2022-11-22 | 北京合康新能科技股份有限公司 | Box body assembly, energy storage device and control method and control device of energy storage device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113078404A (en) | Battery pack safety protection system and method | |
| CN110838600A (en) | Lithium ion battery pack thermal runaway control system for new energy electric vehicle and operation method | |
| US8647758B2 (en) | Electrochemical energy storage device | |
| CN109698310B (en) | Pipeline communication type power supply system and safety management method thereof | |
| KR20220092323A (en) | Fire extinguishing system of battery pack | |
| CN105470424A (en) | Flame resistant method and apparatus for battery energy storage system | |
| DE102008043789A1 (en) | battery module | |
| CN208630361U (en) | A kind of hydrogen storage system | |
| CN112326146B (en) | Auxiliary control system with adjustable pressure for high-pressure gas sealing detection | |
| CN206541906U (en) | Electrokinetic cell bag and vehicle | |
| CN209947989U (en) | Fire extinguishing device for high-capacity lithium ion battery power system | |
| CN215733542U (en) | Battery pack charging system | |
| WO2022006902A1 (en) | Thermal runaway detection method and battery management system | |
| EP4091862A1 (en) | Battery pack charging system and charging method thereof | |
| CN113541243A (en) | Battery pack charging system and charging method thereof | |
| CN113659237A (en) | Battery energy storage system protected by inert gas and capable of preventing spontaneous combustion | |
| CN114762764A (en) | New energy vehicle power battery compartment fire extinguishing system and fire extinguishing method thereof | |
| CN216545749U (en) | Power protection system, power supply system and electric vehicle for efficiently suppressing fire | |
| CN217544801U (en) | Power box | |
| CN113113638B (en) | High-pressure hydrogen supply system of fuel cell automobile | |
| CN220041967U (en) | Battery cabinet convenient for exhausting | |
| CN111211369A (en) | Battery safety device and battery safety monitoring method | |
| CN220070542U (en) | Energy storage system and electronic equipment | |
| KR102582397B1 (en) | One Way Valve Assembly for Hydrogen Storage Tank | |
| CN220774458U (en) | Multifunctional bin and energy storage equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information |
Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Applicant after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210706 |
|
| RJ01 | Rejection of invention patent application after publication |