WO2023246793A1 - Appareil de détection d'endommagement pour plaque de protection inférieure de batterie, structure de protection de batterie, et véhicule - Google Patents

Appareil de détection d'endommagement pour plaque de protection inférieure de batterie, structure de protection de batterie, et véhicule Download PDF

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Publication number
WO2023246793A1
WO2023246793A1 PCT/CN2023/101442 CN2023101442W WO2023246793A1 WO 2023246793 A1 WO2023246793 A1 WO 2023246793A1 CN 2023101442 W CN2023101442 W CN 2023101442W WO 2023246793 A1 WO2023246793 A1 WO 2023246793A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
battery bottom
coil
bottom guard
sampling unit
Prior art date
Application number
PCT/CN2023/101442
Other languages
English (en)
Chinese (zh)
Inventor
谭志佳
万龙
彭青波
杨圣琳
鲁鹏
Original Assignee
比亚迪股份有限公司
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 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2023246793A1 publication Critical patent/WO2023246793A1/fr

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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

Definitions

  • the present disclosure relates to the field of vehicle technology, and in particular, to a battery bottom guard panel damage detection device, a battery protection structure and a vehicle.
  • a pressure sensor is usually arranged between the battery bottom guard and the battery pack.
  • the pressure sensor is used to detect the stress of the battery bottom guard to determine whether the battery bottom guard is damaged and thus determine the degree of harm to the battery pack caused by a collision.
  • the pressure sensor can only detect the stress on the battery bottom guard when it is subject to stress and strain.
  • the pressure sensor may only follow the vibration of the battery bottom guard and cannot accurately reflect the stress of the battery bottom guard, resulting in the pressure sensor not being able to accurately Check whether the battery bottom shield is damaged.
  • the present disclosure aims to solve at least one of the technical problems existing in the prior art.
  • one purpose of the present disclosure is to provide a battery bottom guard plate damage detection device that can accurately detect the stress of the battery bottom guard plate and has high detection accuracy and structure. Advantages such as simplicity.
  • a battery protection structure having the above-mentioned battery bottom guard plate damage detection device is also proposed.
  • a battery bottom guard plate damage detection device including: a sampling unit, the sampling unit includes a magnetic core and a coil, the magnetic core is suitable for installation on The battery bottom shield forms a magnetic field, and the coil is suitable for being installed on the battery bottom shield and located within the magnetic field.
  • the magnetic core and the coil move relative to each other. , the magnetic induction of the coil cutting the magnetic field a wire to generate current; and a processing unit connected to the coil for detecting the current generated by the coil.
  • the battery bottom guard plate damage detection device can accurately detect the stress condition of the battery bottom guard plate, and has the advantages of high detection accuracy and simple structure.
  • the sampling unit further includes: a buffer filled in the housing, and both the magnetic core and the coil are movably installed in the housing through the buffer. body.
  • the housing is a non-metallic piece.
  • the vehicle according to the third embodiment of the present disclosure can accurately detect the stress of the battery bottom guard plate by utilizing the battery protection structure according to the second embodiment of the present disclosure, and has the advantages of high detection accuracy and simple structure. advantage.
  • Figure 1 is a schematic structural diagram of a sampling unit according to an embodiment of the present disclosure.
  • Figure 3 is an exploded view of a battery protection structure according to another embodiment of the present disclosure.
  • Figure 4 is a schematic diagram of the arrangement of sampling units on a battery protection structure according to an embodiment of the present disclosure.
  • Figure 5 is a schematic diagram of a vehicle according to an embodiment of the present disclosure.
  • first feature and “second feature” may include one or more of the features.
  • the magnetic core 110 is installed on the battery bottom protective plate 200 and forms a magnetic field
  • the coil 120 is installed on the battery bottom protective plate 200 and located within the magnetic field. That is to say, the magnetic core 110 and the coil 120 are respectively connected to the battery bottom shield 200 .
  • the battery bottom guard 200 does not collide or the collision force is small, and the vibration of the battery bottom guard 200 is small
  • the relative position of the coil 120 and the battery bottom guard 200 can remain relatively stable
  • the magnetic core 110 can remain relatively stable relative to the battery bottom guard.
  • the relative position of the plate 200 can remain relatively stable.
  • the positions of the magnetic core 110 and the coil 120 are relatively fixed, the current generated by the sampling unit 100 is small or no current is generated, and the collision energy suffered by the battery bottom shield 200 is small and can be ignored. Therefore, the sampling unit 100 is prevented from being too sensitive to vibration, and the detection accuracy of the battery bottom guard plate damage detection device 300 is ensured.
  • the magnetic core 110 and the coil 120 move relative to each other, and the coil 120 cuts the magnetic flux lines of the magnetic field to generate current.
  • the processing unit 10 is connected to the coil 120 and is used to detect the coil 120 the current generated. Specifically, when the battery bottom guard 200 is impacted by energy, that is, when it is hit by a collision, the battery bottom guard 200 will vibrate, and the magnetic core 110 will move relative to the battery bottom guard 200 due to the vibration of the battery bottom guard 200 . .
  • the coil 120 will also move relative to the battery bottom guard 200 due to the vibration of the battery bottom guard 200 , and the movement speed of the coil 120 relative to the battery bottom guard 200 is the same as the movement speed of the magnetic core 110 relative to the battery bottom guard 200 .
  • the moving speeds are different, so that the magnetic core 110 and the coil 120 move relative to each other, and the magnetic core 110 undergoes reciprocating motion to generate eddy currents.
  • the battery bottom guard 200 receives different energy impacts, and the relative movement speed and amplitude of the magnetic core 110 and the coil 120 are different. The greater the energy impact that the battery bottom shield 200 receives, the greater the current generated by the coil 120 . Therefore, the processing unit 10 can detect the current of the coil 120 to determine the magnitude of the energy impact received by the battery bottom guard 200 .
  • the battery bottom guard plate damage detection device 300 in the embodiment of the present disclosure does not need to be squeezed, and the vibration of the battery bottom guard plate 200 will almost always be transmitted to the battery bottom guard plate damage detection device 300 .
  • the battery bottom guard plate damage detection device 300 can determine the magnitude of the energy impact received by the battery bottom guard plate 200 based on the vibration amplitude of the battery bottom guard plate 200, making the detection more accurate.
  • the battery bottom guard plate damage detection device 300 can ignore the influence of small vibrations and accurately detect the stress of the battery bottom guard plate 200, and has the detection ability It has the advantages of high accuracy and simple structure.
  • the mass of the magnetic core 110 and the mass of the coil 120 are different, so that the two move relative to each other when the battery bottom shield 200 is impacted by energy.
  • the coil 120 will be less affected by the vibration of the battery bottom shield 200. That is to say, when the battery bottom guard 200 vibrates, the vibration frequency and vibration amplitude of the coil 120 relative to the battery bottom guard 200 are smaller, while the inertia of the magnetic core 110 is greater.
  • the vibration frequency and vibration amplitude of the plate 200 are relatively large.
  • controllable relative position movement can also be formed based on the different fixing methods of the magnetic core 110 and the coil 120 to detect the damaged state.
  • the coil 120 is encapsulated with resin (such as epoxy, acrylic, polyurethane, etc.) to form a ring structure
  • the magnetic core 110 can be made of damping materials (such as silicone rubber, nitrile rubber, foam materials and other highly elastic materials) Limit the position of magnetic core 110. Only when encountering an impact, the inertia of the magnetic core 110 can be relied upon to compress the highly elastic material to generate a signal.
  • the sampling unit 100 further includes a housing 130 .
  • Both the magnetic core 110 and the coil 120 are movably installed in the housing 130 .
  • the coil 120 has a first lead wire 121 and a second lead wire 122 extending out of the housing 130 .
  • the processing unit 10 is located outside the housing 130 and connected to the first lead wire 121 and the second lead wire 122 .
  • the housing 130 is a non-metallic piece.
  • the housing 130 may be a non-metallic component such as ceramic or engineering plastic.
  • the non-metallic housing 130 will not affect the magnetic field of the coil 120 cutting the magnetic core 110, further improving the sampling unit 100's detection accuracy of the energy impact on the battery bottom guard 200, and making the measurement more accurate.
  • the housing 130 is a metal piece.
  • the housing 130 may be made of metal such as iron or aluminum.
  • the electromagnetic interference of the external magnetic field on the sampling unit 100 can be reduced, thereby ensuring the accuracy of the initial value of the current.
  • the housing 130 can shield the electromagnetic interference of the external magnetic field on the sampling unit 100, thereby improving the detection accuracy of the sampling unit 100.
  • the battery protection structure 1 according to the embodiment of the present disclosure is described below with reference to FIGS. 2 and 3 .
  • the battery protection structure 1 includes a battery bottom guard 200 and a battery bottom guard damage detection device 300 according to the above embodiment of the present disclosure.
  • the battery bottom guard plate damage detection device 300 according to the above embodiment of the present disclosure, the influence of small vibrations can be ignored, and the force of the battery bottom guard plate 200 can be accurately detected. It has the advantages of high detection accuracy and simple structure.
  • the sampling unit 100 can be detachably installed on the battery bottom guard 200 through the installation groove 210 .
  • the battery bottom guard 200 is detachably installed on the battery pack 22 .
  • the battery bottom guard 200 can be replaced separately without the need to disassemble and replace the battery pack 22 and the sampling unit 100, thereby saving costs.
  • When installing or repairing the sampling unit 100 only the battery bottom guard needs to be removed.
  • the board 200 can be disassembled alone, and there is no need to disassemble the battery pack 22, making the operation more convenient.
  • the sampling unit 100 is installed on the buffer layer 220 .
  • the first wear-resistant layer 230 and the second wear-resistant layer 240 are provided on both sides of the buffer layer 220 in the thickness direction and cover the sampling unit 100 .
  • multiple sampling units 100 are arranged at intervals along the length direction of the battery bottom guard 200 . And/or, the plurality of sampling units 100 are arranged at intervals along the width direction of the battery bottom shield 200 . Therefore, the plurality of sampling units 100 can be arranged in multiple rows and columns along the length direction and width direction of the battery bottom guard 200 .
  • the vibration state of the single-row sampling unit 100 or the single-row sampling unit 100 will be the same.
  • the processing unit 10 can determine that the vehicle 2 is driving on a road with bad road conditions, thereby not judging the battery bottom protection. Board 200 was damaged.
  • the processing unit 10 can detect that the current of some sampling units 100 is larger, and can determine based on the magnitude of the current. Because the corresponding part of the sampling unit 100 is damaged, the detection accuracy is higher.
  • the axial direction of the coil 120 is disposed along the thickness direction of the battery bottom shield 200 .
  • the magnetic core 110 may be cylindrical, the coil 120 surrounds the magnetic core 110 along its circumferential direction, and the axial direction of the magnetic core 110 is also disposed along the thickness direction of the battery bottom shield 200 . But not limited to this.
  • the amplitude along the thickness direction of the battery bottom guard 200 will be larger.
  • the vibration of the battery bottom guard 200 can be better transmitted to the coil 120 , so that the coil 120 can follow the battery bottom guard. 200 vibrations.
  • the coil 120 can move relative to the magnetic core 110, which is conducive to more accurately converting the energy impact on the battery bottom guard 200 into the current of the coil 120, further improving the detection of the battery bottom guard damage detection device 300. accuracy.
  • the following describes a vehicle 2 according to an embodiment of the present disclosure with reference to FIG. 5 .
  • the vehicle 2 includes a body 21 , a battery pack 22 and a battery protection structure 1 according to the above embodiment of the present disclosure.
  • the battery pack 22 is installed on the vehicle body 21 .
  • the battery bottom guard 200 is installed on at least one of the vehicle body 21 and the battery pack 22 and is located below the battery pack 22 . Therefore, the battery bottom guard 200 can protect the bottom of the battery pack 22 to prevent stones or road bumps from directly causing damage to the bottom of the battery pack 22 . Moreover, the battery bottom guard 200 can be replaced separately. When disassembling the battery bottom guard 200, there is no need to disassemble the battery pack 22, making disassembly and assembly more convenient.
  • the battery protection structure 1 according to the above embodiment of the present disclosure, the influence of small vibrations can be ignored and the stress condition of the battery bottom guard 200 can be accurately detected, which has the advantages of high detection accuracy and simple structure. Etc.
  • the sampling unit 100 is provided on the side of the battery bottom guard 200 facing the battery pack 22 .
  • the side of the battery bottom guard 200 facing away from the battery pack 22 can block the sampling unit 100 , thereby protecting the sampling unit 100 and preventing damage to the sampling unit 100 , thus ensuring the detection accuracy of the sampling unit 100 .
  • the sampling unit 100 can be exposed on the side of the battery bottom guard 200 facing the battery pack 22 , so that the sampling unit 100 is easier to install on the battery bottom guard 200 and can be disassembled more simply, further simplifying the operation of the sampling unit 100 and the battery pack 22 .
  • the connection structure of the battery bottom shield 200 is described in this arrangement.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sustainable Energy (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Secondary Cells (AREA)

Abstract

Appareil de détection d'endommagement (300) pour une plaque de protection inférieure de batterie. L'appareil de détection d'endommagement (300) pour une plaque inférieure de batterie comprend : des unités d'échantillonnage (100) et une unité de traitement (10). Chaque unité d'échantillonnage (100) comprend un noyau magnétique (110) et une bobine (120). Les noyaux magnétiques (110) sont appropriés pour être montés sur la plaque de protection inférieure de batterie et former un champ magnétique, et les bobines (120) sont appropriées pour être montées sur la plaque de protection inférieure de batterie et sont situées dans le champ magnétique. Lorsque la plaque de protection inférieure de batterie est soumise à un choc énergétique, les noyaux magnétiques (110) et les bobines (120) se déplacent les uns par rapport aux autres, et les bobines (120) coupent la ligne d'induction magnétique du champ magnétique pour générer un courant. L'unité de traitement (10) est connectée aux bobines (120) et est utilisée pour détecter le courant généré par les bobines. Au moyen de la présente solution, l'état de contrainte de la plaque de protection inférieure de batterie peut être détecté avec précision, et la solution présente les avantages d'une précision de détection élevée, d'une structure simple, etc. L'invention concerne également une structure de protection de batterie et un véhicule.
PCT/CN2023/101442 2022-06-21 2023-06-20 Appareil de détection d'endommagement pour plaque de protection inférieure de batterie, structure de protection de batterie, et véhicule WO2023246793A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202221563992.5U CN217786408U (zh) 2022-06-21 2022-06-21 电池底护板受损检测装置、电池防护结构和车辆
CN202221563992.5 2022-06-21

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Publication number Priority date Publication date Assignee Title
CN217786408U (zh) * 2022-06-21 2022-11-11 比亚迪股份有限公司 电池底护板受损检测装置、电池防护结构和车辆

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