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WO2024223998A1 - Vehicle traction battery flat box provided with a cover with inclined reinforcing ribs - Google Patents

Vehicle traction battery flat box provided with a cover with inclined reinforcing ribs Download PDF

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Publication number
WO2024223998A1
WO2024223998A1 PCT/FR2024/050281 FR2024050281W WO2024223998A1 WO 2024223998 A1 WO2024223998 A1 WO 2024223998A1 FR 2024050281 W FR2024050281 W FR 2024050281W WO 2024223998 A1 WO2024223998 A1 WO 2024223998A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
vehicle
ribs
battery box
battery
Prior art date
Application number
PCT/FR2024/050281
Other languages
French (fr)
Inventor
Damien BESSETTE
Tou THOR
Paul Bornier
Mihaela Maria MAGAS
Nicolas Tropee
Sebastien Maurice
Original Assignee
Stellantis Auto Sas
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 Stellantis Auto Sas filed Critical Stellantis Auto Sas
Publication of WO2024223998A1 publication Critical patent/WO2024223998A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438—Arrangement under the floor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2410/00—Constructional features of vehicle sub-units
    • B60Y2410/10—Housings

Definitions

  • the present invention relates to a flat battery box for a traction battery of an electric or hybrid motor vehicle equipped with a cover having stiffening ribs, as well as a motor vehicle comprising such a battery box.
  • Some electric or hybrid motor vehicles have a battery powering an electric traction machine which is installed flat under the floor of the vehicle to use a large available surface area while arranging the mass in the lower part of the body in order to obtain a low height of the vehicle's center of gravity.
  • a known type of electric vehicle battery presented in particular by document CN-Y-200969361, comprising a flat, rectangular shape elongated in the longitudinal direction of the vehicle, comprises a box having a lower tank receiving the electrochemical elements.
  • a cover formed by a substantially flat sheet covering the entire battery, has a contour fixed on an upper edge of the tank to seal the box.
  • the cover is made with a relatively thin metal sheet.
  • the sheet has a network of stamped ribs giving it better rigidity without increasing the mass.
  • the battery cover has in its central part two parallel longitudinal ribs, and on each side, symmetrically with respect to the longitudinal median axis, front ribs and rear ribs arranged diagonally, each having a perpendicular direction which is turned towards the centre of the cover. 007.
  • motor vehicles undergo standardised side impact tests on a small-diameter post which concentrates the force on a reduced surface area on the side of the vehicle.
  • one type of test involves a side impact along an inclined axis, forming the rear of the vehicle at an angle of 15° relative to its transverse direction. Some tests apply this impact to a single point on the side of the vehicle arranged on the axis passing through the driver, others repeat this test several times with the same inclination along the length of the side of the battery box in order to test its resistance at every lateral point.
  • the side members of the vehicle body arranged outside the battery box have significant resistance in order to protect the box behind, which has a rigid profile on each side protecting the electrochemical cells.
  • a battery box for a traction battery of an electric or hybrid motor vehicle forming a substantially rectangular flat assembly, having a longitudinal axis comprising a forward direction of the vehicle, the box comprising a metal cover sheet, fixed by its outline to a battery tray, which has ribs made in its thickness, this box being remarkable in that the cover comprises in a central part a reinforcement, and comprises on each side relative to the longitudinal axis, over at least part of the length of this cover, starting towards the outside of the vehicle, first longitudinal ribs, then ribs inclined in a direction which towards the outside is turned towards the rear of this vehicle.
  • An advantage of this battery box is that in the event of a side impact with a rearward tilt at any point on the side of the vehicle, which transmits energy to the side of the cover of this box in this same direction, we obtain a transmission of energy passing mainly through the flat surfaces of the sheet metal of this cover, which arrives substantially perpendicularly on the diagonal ribs.
  • a cover sheet with limited thickness can be used, which reduces mass and costs, and the cover can be placed as close as possible to the battery, which optimizes the volume of the box. Protection of the battery elements inside is provided simply and effectively, without adding a stiffening component to the cover, which would increase mass and costs.
  • the electric or hybrid vehicle traction battery box according to the invention may further comprise one or more of the following features, which may be combined with each other. 019.
  • the ribs have symmetry with respect to the longitudinal axis.
  • the central reinforcement forms a rib which extends along the longitudinal axis over more than half the length of the cover, having similar inclinations.
  • the rib of the central reinforcement has in its cross section a width of between 60 and 120mm, and a height of between 5 and 15mm.
  • the box comprises at least two longitudinal ribs distributed along the length of the cover.
  • the box comprises several inclined ribs distributed along the length of the cover.
  • the inclined ribs may have an inclination of between 30 and 60° relative to the transverse direction of the vehicle.
  • each inclined or longitudinal rib has in its cross section a height of between 2 and 6mm and a width of between 30 and 50mm.
  • the cover sheet made of steel has a surface area greater than 1 m2 and a thickness less than 1 mm.
  • the invention also relates to an electric or hybrid motor vehicle comprising a battery integrated into a box comprising any one of the preceding characteristics, remarkable in that this box is arranged flat under the floor of the vehicle between the front and rear axles.
  • FIG. 1 is a top view of an inclined side impact test on an electric vehicle comprising a battery box according to the invention
  • FIG. 2 is a cross-sectional view of this battery box
  • FIG. 3 is a top view of the box cover showing an inclined side impact transmitted to this cover.
  • FIG. 4 is a detailed view in cross section successively of the longitudinal reinforcement and the lateral ribs of this cover. 033. Throughout the document the upper or top side relates to the vertical direction for a vehicle placed on horizontal ground.
  • Figure 1 shows an electric motor vehicle 2 arranged along a longitudinal axis A having a front side corresponding to the direction of travel of the vehicle, which comprises a traction battery integrated in a sealed box 8 comprising a substantially rectangular flat shape arranged under the floor of the vehicle, between the front and rear axles.
  • the lateral edges of the battery box 8 arrive at a small distance from the sides of the vehicle 2 in order to occupy a major part of the surface of the floor.
  • a standardized test bench for resistance to inclined side impacts of the vehicle 2 comprises a vertical bar 4 rigidly connected to a mass 6 which is projected with a speed V on the side of the vehicle, in a direction turned towards the rear forming an angle of 15° relative to a transverse axis of this vehicle.
  • a penetration of the bar 4 on the side of the vehicle 2 is obtained with a deformation of the side member of the body which absorbs at least part of the transmitted energy, avoiding a plastic deformation of the battery box 8 located behind. However, a portion of the energy is transmitted to this battery box 8, in the form of a shock wave which generates an elastic deformation of its cover.
  • Figures 2, 3 and 4 show the battery box 8 comprising a tray comprising a lower sheet 10 and two side members 12 formed by aluminum profiles having closed cells in order to present high resistance.
  • An upper cover sheet 14 covering this tank comprises a longitudinal central reinforcement 20, and on each side longitudinal ribs 30 and inclined lateral ribs 16 arranged symmetrically with respect to the longitudinal axis A.
  • the space between the central reinforcement 20 and the different ribs 16, 30 constitutes a flat intermediate zone 26.
  • the box 8 receives electrochemical battery cells 18 which are fixed to the floor sheet 10.
  • the cover plate 14 has on its periphery a series of holes 32 receiving tightening screws on the outline of the box 8 in order to ensure a sealing on this contour, to protect the interior cells 18 from projections and blows.
  • the central reinforcement 20 has in cross section a circular arc shape curved upwards, comprising in the middle a maximum height H of between 5 and 15 mm, and on each side a rise to a height H1 of less than 10 mm to reach the intermediate flat area of the cover 26.
  • the width L1 of the central reinforcement 20 separating the two ends of its circular arc is between 60 and 120 mm.
  • Each longitudinal rib 30 or inclined rib 16 has, in detailed cross-section in FIG. 4 at the bottom, a flat upper face comprising a height of between 2 and 6 mm, which ends on each side with a slope to arrive at the intermediate flat area of the cover 26.
  • the total width L2 of the longitudinal ribs 30 or inclined ribs 16 is between 30 and 50 mm. 044.
  • the inclined ribs 16 have an inclination relative to the transverse direction of the vehicle forming an angle of between 30 and 60°, advantageously approximately 45°, with a direction which, starting outwards, is turned towards the rear of this vehicle.
  • Each side of the cover 14 has two short longitudinal ribs 30 distributed along the length of this cover, which are aligned on the same axis arranged starting from the rib 20 approximately at the first third of this side.
  • Figure 3 shows three side impacts inclined towards the rear 40a, 40b, 40c, on the left side of the vehicle, following the standardized tests presented in Figure 1, causing a deformation of the vehicle body, without deform the box 8 but with a shock wave 34 transmitted to the cover 14 in the direction of these impacts.
  • the cover sheet 14 forming a substantially flat assembly having a large surface area, has a vertical vibrational natural mode of its central part which will be excited with the energy received. 049.
  • the intermediate flat zones 26 of the cover sheet 14 between the ribs 16, 30 can vibrate more easily due to their flexibility while transmitting the energy by propagation, whereas the various highly rigid ribs constitute obstacles to this propagation.
  • the wave directly hits the most forward inclined rib 16a arranged substantially perpendicularly, it must be distributed on both sides parallel to this rib, the part facing the inside of the vehicle not reaching the center of the cover 14.
  • a cover 14 can be formed comprising a surface area of more than 1 m 2 , formed with a steel sheet less than one millimeter thick.
  • a cover 14 is thus produced with a sheet of limited thickness which is arranged near the internal electrochemical elements 18 while ensuring their protection, which makes it possible to reduce the mass and costs of this cover, and optimizes the use of the internal volume of the box 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to traction battery box for an electric or hybrid motor vehicle forming a substantially rectangular flat assembly having a longitudinal axis (A) comprising a forward direction of the vehicle (AV), this box (8) being provided with a sheet-metal cover attached by its edges to a battery tray that has ribs formed in the thickness thereof, comprising, in a central portion, a reinforcement (20), the sheet-metal cover comprising, on each side with respect to the longitudinal axis (A), over at least one portion of the length of this cover, starting towards the outside of the vehicle, longitudinal ribs (30) followed by ribs (16) that are inclined in an outward direction towards the rear of this vehicle.

Description

DESCRIPTION DESCRIPTION
Titre : CAISSON PLAT DE BATTERIE DE TRACTION DE VEHICULE EQUIPE D’UN COUVERCLE AVEC NERVURES DE RENFORT INCLINEES Title: FLAT VEHICLE TRACTION BATTERY BOX EQUIPPED WITH A COVER WITH INCLINED REINFORCING RIBS
001 . La présente invention revendique la priorité de la demande française N°2304205 déposée le 26.04.2023 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. 001. The present invention claims priority from French application No. 2304205 filed on 04/26/2023, the content of which (text, drawings and claims) is incorporated herein by reference.
002. La présente invention concerne un caisson plat de batterie de traction de véhicule automobile électrique ou hybride équipé d’un couvercle présentant des nervures de rigidification, ainsi qu’un véhicule automobile comportant un tel caisson de batterie. 002. The present invention relates to a flat battery box for a traction battery of an electric or hybrid motor vehicle equipped with a cover having stiffening ribs, as well as a motor vehicle comprising such a battery box.
003. Certains véhicules automobiles électrique ou hybride comportent une batterie alimentant une machine électrique de traction qui est installée à plat sous le plancher du véhicule pour utiliser une grande surface disponible tout en disposant la masse en partie basse de la caisse afin d’obtenir une faible hauteur du centre de gravité du véhicule. 003. Some electric or hybrid motor vehicles have a battery powering an electric traction machine which is installed flat under the floor of the vehicle to use a large available surface area while arranging the mass in the lower part of the body in order to obtain a low height of the vehicle's center of gravity.
004. Un type de batterie de véhicule électrique connu, présenté notamment par le document CN-Y-200969361 , comprenant une forme plate, rectangulaire et allongée suivant la direction longitudinale du véhicule, comporte un caisson disposant d’un bac inférieur recevant les éléments électrochimiques. Un couvercle formé par une tôle sensiblement plate couvrant l’ensemble de la batterie, présente un contour fixé sur un rebord supérieur du bac pour réaliser l’étanchéité du caisson. 004. A known type of electric vehicle battery, presented in particular by document CN-Y-200969361, comprising a flat, rectangular shape elongated in the longitudinal direction of the vehicle, comprises a box having a lower tank receiving the electrochemical elements. A cover formed by a substantially flat sheet covering the entire battery, has a contour fixed on an upper edge of the tank to seal the box.
005. D’une manière générale pour limiter la masse du véhicule et son coût, et pour optimiser le volume intérieur disponible dans le caisson de batterie, on réalise le couvercle avec une tôle métallique relativement fine. Afin d’améliorer la rigidité du couvercle, notamment pour réduire l’amplitude des oscillations verticales de premier ordre de sa partie centrale, la tôle comporte un réseau de nervures embouties lui donnant une meilleure rigidité sans augmenter la masse. 006. Suivant un mode de réalisation présenté dans ce document, le couvercle de batterie comporte dans sa partie centrale deux nervures longitudinales parallèles, et de chaque côté, de manière symétrique par rapport à l’axe médian longitudinal, des nervures avant et des nervures arrière disposées en diagonale, présentant chacune une direction perpendiculaire qui est tournée vers le centre du couvercle. 007. Par ailleurs pour leur homologation les véhicules automobiles subissent des tests de chocs latéraux normalisés sur un poteau de petit diamètre qui concentre l’effort sur une surface réduite du côté du véhicule. Suivant les régions géographiques et les constructeurs, un type d’essai comporte un choc latéral suivant un axe incliné, formant l’arrière du véhicule un angle de 15° par rapport à sa direction transversale. Certains essais appliquent ce choc sur un seul point du côté du véhicule disposé sur l’axe passant par le conducteur, d’autres répètent cet essai plusieurs fois avec la même inclinaison sur la longueur du côté du caisson de batterie afin de tester sa résistance en tout point latéral. 005. In general, to limit the mass of the vehicle and its cost, and to optimize the interior volume available in the battery box, the cover is made with a relatively thin metal sheet. In order to improve the rigidity of the cover, in particular to reduce the amplitude of the first-order vertical oscillations of its central part, the sheet has a network of stamped ribs giving it better rigidity without increasing the mass. 006. According to an embodiment presented in this document, the battery cover has in its central part two parallel longitudinal ribs, and on each side, symmetrically with respect to the longitudinal median axis, front ribs and rear ribs arranged diagonally, each having a perpendicular direction which is turned towards the centre of the cover. 007. Furthermore, for their approval, motor vehicles undergo standardised side impact tests on a small-diameter post which concentrates the force on a reduced surface area on the side of the vehicle. Depending on the geographical regions and manufacturers, one type of test involves a side impact along an inclined axis, forming the rear of the vehicle at an angle of 15° relative to its transverse direction. Some tests apply this impact to a single point on the side of the vehicle arranged on the axis passing through the driver, others repeat this test several times with the same inclination along the length of the side of the battery box in order to test its resistance at every lateral point.
008. Par ailleurs les longerons latéraux de la caisse du véhicule disposés à l’extérieur du caisson de batterie, présentent une résistance importante afin de protéger le caisson se trouvant derrière, qui comporte sur chaque côté un profil rigide protégeant les cellules électrochimiques. 008. Furthermore, the side members of the vehicle body arranged outside the battery box have significant resistance in order to protect the box behind, which has a rigid profile on each side protecting the electrochemical cells.
009. Toutefois pour ce type d'essai de choc latéral, même si le caisson n’est pas déformé de manière plastique, on peut obtenir une transmission d’énergie dans le couvercle du caisson venant du choc, qui se propage sensiblement dans la direction avant de ce choc sur les parties plates entre les nervures, sans être arrêté de manière efficace par ces nervures. 009. However, for this type of side impact test, even if the box is not plastically deformed, energy transmission into the box cover from the impact can occur, propagating substantially in the forward direction of the impact on the flat parts between the ribs, without being effectively stopped by the ribs.
010. En particulier pour le couvercle du caisson de batterie présenté par le document de l’art antérieur, comprenant des nervures disposées en diagonale et inversée entre l’avant et l’arrière, avec une série de chocs latéraux inclinés répartis sur tout le côté du caisson de batterie, certains de ces chocs vont émettre une énergie dans une direction sensiblement parallèle aux nervures. 010. In particular for the battery box cover presented by the prior art document, comprising ribs arranged diagonally and inverted between the front and the rear, with a series of inclined lateral impacts distributed over the entire side of the battery box, some of these impacts will emit energy in a direction substantially parallel to the ribs.
011 . Cette énergie peut se propager dans la partie plate entre ces nervures, et atteindre directement le centre de la tôle de couvercle en le faisant vibrer verticalement avec une forte amplitude. Une vibration de trop grande amplitude du centre du couvercle peut poser des problèmes de contact de sa tôle avec les éléments électrochimiques contenus à l’intérieur, et entraîner des incidents comprenant des risques de dommage électrique et de départ d’incendie. 011. This energy can propagate in the flat part between these ribs, and directly reach the center of the cover sheet, making it vibrate vertically with a high amplitude. A vibration of too great an amplitude of the center of the cover can cause problems of contact of its sheet with the electrochemical elements contained inside, and lead to incidents including risks of electrical damage and fire.
012. Un augmentation de la hauteur des nervures pour améliorer la rigidité de la tôle de couvercle, prend plus de place et réduit l’espace disponible pour la batterie disposée en dessous. 013. La présente invention a notamment pour but d’éviter ces problèmes de l’art antérieur. 012. An increase in the height of the ribs to improve the rigidity of the cover sheet, takes up more space and reduces the space available for the battery located below. 013. The present invention aims in particular to avoid these problems of the prior art.
014. Elle propose à cet effet un caisson de batterie de traction de véhicule automobile électrique ou hybride formant un ensemble plat sensiblement rectangulaire, présentant un axe longitudinal comportant une direction avant du véhicule, le caisson comprenant une tôle métallique de couvercle, fixée par son contour à un bac de batterie, qui dispose de nervures réalisées dans son épaisseur, ce caisson étant remarquable en ce que le couvercle comporte dans une partie centrale un renfort, et comporte de chaque côté par rapport à l’axe longitudinal, sur au moins une partie de la longueur de ce couvercle, en partant vers l’extérieur du véhicule, d’abord des nervures longitudinales, puis des nervures inclinées suivant une direction qui vers l’extérieur est tournée vers l’arrière de ce véhicule. 014. To this end, it proposes a battery box for a traction battery of an electric or hybrid motor vehicle forming a substantially rectangular flat assembly, having a longitudinal axis comprising a forward direction of the vehicle, the box comprising a metal cover sheet, fixed by its outline to a battery tray, which has ribs made in its thickness, this box being remarkable in that the cover comprises in a central part a reinforcement, and comprises on each side relative to the longitudinal axis, over at least part of the length of this cover, starting towards the outside of the vehicle, first longitudinal ribs, then ribs inclined in a direction which towards the outside is turned towards the rear of this vehicle.
015. Un avantage de ce caisson de batterie est qu’en cas de choc latéral avec une inclinaison vers l’arrière sur un point quelconque du côté du véhicule, qui transmet une énergie sur le côté du couvercle de ce caisson suivant cette même direction, on obtient une transmission d’énergie passant principalement par les surfaces plates de la tôle de ce couvercle, qui arrive sensiblement perpendiculairement sur les nervures en diagonale. 015. An advantage of this battery box is that in the event of a side impact with a rearward tilt at any point on the side of the vehicle, which transmits energy to the side of the cover of this box in this same direction, we obtain a transmission of energy passing mainly through the flat surfaces of the sheet metal of this cover, which arrives substantially perpendicularly on the diagonal ribs.
016. La direction de propagation de l’énergie bloquée par les nervures inclinées se répartit alors de chaque côté sur les zones plates. L’énergie partant en direction du centre rencontre les nervures longitudinales qui les dévient à leur tour en évitant un accès directement vers le centre. On obtient à la fin un faible niveau d’énergie qui atteint le renfort central ce qui évite une vibration de grande amplitude de cette partie centrale. 016. The direction of propagation of the energy blocked by the inclined ribs is then distributed on each side on the flat areas. The energy going towards the center meets the longitudinal ribs which in turn deflect them, avoiding direct access to the center. At the end, a low level of energy is obtained which reaches the central reinforcement, which avoids a high amplitude vibration of this central part.
017. On peut utiliser une tôle de couvercle présentant une épaisseur limitée ce qui réduit la masse et les coûts, et disposer le couvercle au plus près de la batterie ce qui permet d’optimiser le volume du caisson. On protège de manière simple et efficace, sans ajouter de composant de rigidification sur le couvercle qui augmenterait la masse et les coûts, une protection des éléments de batterie se trouvant à l’intérieur. 017. A cover sheet with limited thickness can be used, which reduces mass and costs, and the cover can be placed as close as possible to the battery, which optimizes the volume of the box. Protection of the battery elements inside is provided simply and effectively, without adding a stiffening component to the cover, which would increase mass and costs.
018. Le caisson de batterie de traction de véhicule électrique ou hybride selon l’invention peut comporter de plus une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles. 019. Avantageusement, les nervures présentent une symétrie par rapport à l’axe longitudinal. 018. The electric or hybrid vehicle traction battery box according to the invention may further comprise one or more of the following features, which may be combined with each other. 019. Advantageously, the ribs have symmetry with respect to the longitudinal axis.
020. Avantageusement, le renfort central forme une nervure qui s’étend suivant l’axe longitudinal sur plus de la moitié de la longueur du couvercle, présentant des inclinaisons proches. 020. Advantageously, the central reinforcement forms a rib which extends along the longitudinal axis over more than half the length of the cover, having similar inclinations.
021 . Dans ce cas, avantageusement la nervure du renfort central présente dans sa section transversale une largeur comprise entre 60 et 120mm, et une hauteur comprise entre 5 et 15mm. 021. In this case, advantageously the rib of the central reinforcement has in its cross section a width of between 60 and 120mm, and a height of between 5 and 15mm.
022. Avantageusement, le caisson comporte au moins deux nervures longitudinales réparties sur la longueur du couvercle. 022. Advantageously, the box comprises at least two longitudinal ribs distributed along the length of the cover.
023. Avantageusement, le caisson comporte plusieurs nervures inclinées réparties sur la longueur du couvercle. 023. Advantageously, the box comprises several inclined ribs distributed along the length of the cover.
024. Dans ce cas, les nervures inclinées peuvent présenter une inclinaison comprise entre 30 et 60° par rapport à la direction transversale du véhicule. 024. In this case, the inclined ribs may have an inclination of between 30 and 60° relative to the transverse direction of the vehicle.
025. Avantageusement, chaque nervure inclinée ou longitudinale présente dans sa section transversale une hauteur comprise entre 2 et 6mm et une largeur comprise entre 30 et 50mm. 025. Advantageously, each inclined or longitudinal rib has in its cross section a height of between 2 and 6mm and a width of between 30 and 50mm.
026. Avantageusement, la tôle de couvercle réalisée en acier présente une surface supérieure à 1 m2 et une épaisseur inférieure à 1mm. 026. Advantageously, the cover sheet made of steel has a surface area greater than 1 m2 and a thickness less than 1 mm.
027. L’invention a aussi pour objet un véhicule automobile électrique ou hybride comportant une batterie intégrée dans un caisson comprenant l’une quelconque des caractéristiques précédentes, remarquable en ce que ce caisson est disposé à plat sous le plancher du véhicule entre les trains avant et arrière. 027. The invention also relates to an electric or hybrid motor vehicle comprising a battery integrated into a box comprising any one of the preceding characteristics, remarkable in that this box is arranged flat under the floor of the vehicle between the front and rear axles.
028. L’invention sera mieux comprise et d’autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d’exemple, en référence aux dessins annexés dans lesquels : 028. The invention will be better understood and other characteristics and advantages will appear more clearly on reading the description given below by way of example, with reference to the appended drawings in which:
029. [Fig. 1] est une vue de dessus d’un test de chocs latéraux inclinés sur un véhicule électrique comportant un caisson de batterie selon l’invention ; 029. [Fig. 1] is a top view of an inclined side impact test on an electric vehicle comprising a battery box according to the invention;
030. [Fig. 2] est une vue en coupe transversale de ce caisson de batterie ; 030. [Fig. 2] is a cross-sectional view of this battery box;
031 . [Fig. 3] est une vue de dessus du couvercle de caisson présentant un choc latéral incliné transmis à ce couvercle ; et 031. [Fig. 3] is a top view of the box cover showing an inclined side impact transmitted to this cover; and
032. [Fig. 4] est une vue de détail en coupe transversale successivement du renfort longitudinal et des nervures latérales de ce couvercle. 033. Dans l’ensemble du document le côté supérieur ou dessus est relatif à la direction verticale pour un véhicule posé sur un sol horizontal. 032. [Fig. 4] is a detailed view in cross section successively of the longitudinal reinforcement and the lateral ribs of this cover. 033. Throughout the document the upper or top side relates to the vertical direction for a vehicle placed on horizontal ground.
034. La figure 1 présente un véhicule automobile électrique 2 disposé suivant un axe longitudinal A présentant un côté avant correspondant au sens de marche du véhicule, qui comporte une batterie de traction intégrée dans un caisson étanche 8 comprenant une forme plate sensiblement rectangulaire disposée sous le plancher du véhicule, entre les trains avant et arrière. Les bords latéraux du caisson de batterie 8 arrivent à une petite distance des côtés du véhicule 2 afin d’occuper une majeure partie de la surface du plancher. 034. Figure 1 shows an electric motor vehicle 2 arranged along a longitudinal axis A having a front side corresponding to the direction of travel of the vehicle, which comprises a traction battery integrated in a sealed box 8 comprising a substantially rectangular flat shape arranged under the floor of the vehicle, between the front and rear axles. The lateral edges of the battery box 8 arrive at a small distance from the sides of the vehicle 2 in order to occupy a major part of the surface of the floor.
035. Un banc de test normalisé de résistance aux chocs latéraux inclinés du véhicule 2, comporte une barre verticale 4 reliée de manière rigide à une masse 6 qui est projetée avec une vitesse V sur le côté du véhicule, dans une direction tournée vers l’arrière formant un angle de 15° par rapport à un axe transversal de ce véhicule. 035. A standardized test bench for resistance to inclined side impacts of the vehicle 2, comprises a vertical bar 4 rigidly connected to a mass 6 which is projected with a speed V on the side of the vehicle, in a direction turned towards the rear forming an angle of 15° relative to a transverse axis of this vehicle.
036. On obtient une pénétration de la barre 4 sur le côté du véhicule 2 avec une déformation du longeron latéral de la caisse qui absorbe au moins en partie l’énergie transmise, en évitant une déformation plastique du caisson de batterie 8 se trouvant derrière. Toutefois une part d’énergie est transmise à ce caisson de batterie 8, sous forme d’onde de choc qui génère une déformation élastique de son couvercle. 036. A penetration of the bar 4 on the side of the vehicle 2 is obtained with a deformation of the side member of the body which absorbs at least part of the transmitted energy, avoiding a plastic deformation of the battery box 8 located behind. However, a portion of the energy is transmitted to this battery box 8, in the form of a shock wave which generates an elastic deformation of its cover.
037. Les figures 2, 3 et 4 présentent le caisson de batterie 8 comprenant un bac comportant une tôle inférieure 10 et deux longerons latéraux 12 formés par des profilés d’aluminium disposant de cellules fermées afin de présenter une grande résistance. 037. Figures 2, 3 and 4 show the battery box 8 comprising a tray comprising a lower sheet 10 and two side members 12 formed by aluminum profiles having closed cells in order to present high resistance.
038. Une tôle supérieure de couvercle 14 couvrant ce bac, comporte un renfort central longitudinal 20, et de chaque côté des nervures longitudinales 30 et des nervures latérales inclinées 16 disposées de manière symétrique par rapport à l’axe longitudinal A. L’espace entre le renfort central 20 et les différentes nervures 16, 30 constitue une zone intermédiaire plate 26. 038. An upper cover sheet 14 covering this tank, comprises a longitudinal central reinforcement 20, and on each side longitudinal ribs 30 and inclined lateral ribs 16 arranged symmetrically with respect to the longitudinal axis A. The space between the central reinforcement 20 and the different ribs 16, 30 constitutes a flat intermediate zone 26.
039. Le caisson 8 reçoit des cellules électrochimiques de batterie 18 qui sont fixées sur la tôle de plancher 10. 039. The box 8 receives electrochemical battery cells 18 which are fixed to the floor sheet 10.
040. La tôle de couvercle 14 comporte sur sa périphérie une série de perçages 32 recevant des vis de serrage sur le contour du caisson 8 afin d’assurer une étanchéité sur ce contour, pour protéger les cellules intérieures 18 des projections et des coups. 040. The cover plate 14 has on its periphery a series of holes 32 receiving tightening screws on the outline of the box 8 in order to ensure a sealing on this contour, to protect the interior cells 18 from projections and blows.
041 . Le renfort central de couvercle 20, symétrique par rapport à l’axe longitudinal A, forme une nervure partant du côté avant du couvercle 14 pour s’étendre sur environ les trois quarts de sa longueur. 041. The central cover reinforcement 20, symmetrical with respect to the longitudinal axis A, forms a rib starting from the front side of the cover 14 to extend over approximately three quarters of its length.
042. Le renfort central 20, détaillé figure 4 en haut, présente en coupe transversale une forme en arc de cercle bombé vers le haut, comprenant au milieu une hauteur maximum H comprise entre 5 et 15mm, et de chaque côté une remontée sur une hauteur H1 inférieure à 10mm pour arriver à la zone plate intermédiaire de couvercle 26. La largeur L1 du renfort central 20 séparant les deux extrémités de son arc de cercle est comprise entre 60 et 120mm. 042. The central reinforcement 20, detailed in figure 4 above, has in cross section a circular arc shape curved upwards, comprising in the middle a maximum height H of between 5 and 15 mm, and on each side a rise to a height H1 of less than 10 mm to reach the intermediate flat area of the cover 26. The width L1 of the central reinforcement 20 separating the two ends of its circular arc is between 60 and 120 mm.
043. Chaque nervure longitudinale 30 ou inclinée 16 présente, en coupe transversale détaillée figure 4 en bas, une face supérieure plate comprenant une hauteur comprise entre 2 et 6mm, qui se termine de chaque côté par une pente pour arriver sur la zone plate intermédiaire de couvercle 26. La largeur totale L2 des nervures longitudinales 30 ou inclinées 16 est comprise entre 30 et 50mm. 044. Pour chaque côté du couvercle 14 les nervures inclinées 16 comportent une inclinaison par rapport à la direction transversale du véhicule formant un angle compris entre 30 et 60°, avantageusement environ 45°, avec une direction qui en partant vers l’extérieur est tournée vers l’arrière de ce véhicule. 043. Each longitudinal rib 30 or inclined rib 16 has, in detailed cross-section in FIG. 4 at the bottom, a flat upper face comprising a height of between 2 and 6 mm, which ends on each side with a slope to arrive at the intermediate flat area of the cover 26. The total width L2 of the longitudinal ribs 30 or inclined ribs 16 is between 30 and 50 mm. 044. For each side of the cover 14, the inclined ribs 16 have an inclination relative to the transverse direction of the vehicle forming an angle of between 30 and 60°, advantageously approximately 45°, with a direction which, starting outwards, is turned towards the rear of this vehicle.
045. Chaque côté du couvercle 14 comporte deux nervures longitudinales courtes 30 réparties sur la longueur de ce couvercle, qui sont alignées sur un même axe disposé en partant de la nervure 20 environ au premier tiers de ce côté. 045. Each side of the cover 14 has two short longitudinal ribs 30 distributed along the length of this cover, which are aligned on the same axis arranged starting from the rib 20 approximately at the first third of this side.
046. En partant de l’arrière on a deux nervures inclinées courtes, la première 16a disposée en face de la première nervure longitudinale 30a, la deuxième 16b disposée entre les deux nervures longitudinales 30a, 30b. 046. Starting from the rear there are two short inclined ribs, the first 16a arranged opposite the first longitudinal rib 30a, the second 16b arranged between the two longitudinal ribs 30a, 30b.
047. Suivant une direction transversale alignée sur l’avant du renfort 20, on a trois nervures avant inclinées 16 réparties sur la largeur, comprenant d’abord en partant du centre une nervure inclinée longue 16c puis deux nervures inclinées courtes 16d. 047. Along a transverse direction aligned with the front of the reinforcement 20, there are three inclined front ribs 16 distributed over the width, comprising first starting from the center a long inclined rib 16c then two short inclined ribs 16d.
048. La figure 3 présente trois chocs latéraux inclinés en direction de l’arrière 40a, 40b, 40c, sur le côté gauche du véhicule, suivant les essais normalisés présentés figure 1 , entraînant une déformation de la caisse du véhicule, sans déformer le caisson 8 mais avec une onde de choc 34 transmise au couvercle 14 suivant la direction de ces impacts. La tôle de couvercle 14 formant un ensemble sensiblement plat présentant une grande surface, comporte un mode propre vibratoire vertical de sa partie centrale qui va être excité avec l’énergie reçue. 049. Les zones plates intermédiaires 26 de la tôle de couvercle 14 entre les nervures 16, 30 peuvent vibrer plus facilement par leur souplesse tout en transmettant l’énergie par propagation, alors que les différentes nervures fortement rigides constituent des obstacles à cette propagation. 048. Figure 3 shows three side impacts inclined towards the rear 40a, 40b, 40c, on the left side of the vehicle, following the standardized tests presented in Figure 1, causing a deformation of the vehicle body, without deform the box 8 but with a shock wave 34 transmitted to the cover 14 in the direction of these impacts. The cover sheet 14 forming a substantially flat assembly having a large surface area, has a vertical vibrational natural mode of its central part which will be excited with the energy received. 049. The intermediate flat zones 26 of the cover sheet 14 between the ribs 16, 30 can vibrate more easily due to their flexibility while transmitting the energy by propagation, whereas the various highly rigid ribs constitute obstacles to this propagation.
050. Pour le choc le plus en avant 40a l’onde vient directement buter sur la nervure inclinée 16a la plus en avant disposée sensiblement perpendiculairement, elle doit se répartir des deux côtés parallèlement à cette nervure, la partie tournée vers l’intérieur du véhicule n’atteignant pas le centre du couvercle 14. 050. For the most forward impact 40a the wave directly hits the most forward inclined rib 16a arranged substantially perpendicularly, it must be distributed on both sides parallel to this rib, the part facing the inside of the vehicle not reaching the center of the cover 14.
051 . Pour le choc du milieu 40b d’une manière similaire l’onde vient directement buter sur la deuxième nervure inclinée 16b, puis se répartit des deux côtés, la partie tournée vers l’intérieur du véhicule arrivant sur la première nervure longitudinale 30a qui l’empêche d’atteindre le centre du couvercle 14. 051. For the impact of the middle 40b in a similar manner the wave comes directly into contact with the second inclined rib 16b, then is distributed on both sides, the part facing the inside of the vehicle arriving on the first longitudinal rib 30a which prevents it from reaching the center of the cover 14.
052. Pour le choc de l’arrière 40c l’onde arrive sur les deux nervures arrière inclinées 16d, une partie de l’onde part vers le centre du couvercle 14 pour être arrêtée par la deuxième nervure longitudinale 30b. 052. For the shock of the rear 40c the wave arrives on the two inclined rear ribs 16d, a part of the wave goes towards the center of the cover 14 to be stopped by the second longitudinal rib 30b.
053. On obtient dans tous les cas de choc latéral incliné 40 un blocage de l’onde qui laisse peu d’énergie arriver vers le centre du couvercle 14, et une dispersion de cette énergie vers l’avant et l’arrière, loin de ce centre. La partie centrale du couvercle 14 reçoit un faible niveau d’énergie, son mode propre vibratoire est peu excité avec une amplitude d’oscillation limitée. 053. In all cases of inclined lateral impact 40, we obtain a blocking of the wave which allows little energy to reach the center of the cover 14, and a dispersion of this energy towards the front and the rear, far from this center. The central part of the cover 14 receives a low level of energy, its natural vibration mode is little excited with a limited oscillation amplitude.
054. En particulier on peut former un couvercle 14 comprenant une surface de plus de 1 m2, formé avec une tôle d’acier de moins d’un millimètre d’épaisseur. On réalise ainsi un couvercle 14 avec une tôle d’épaisseur limitée qui est disposé près des éléments électrochimiques intérieurs 18 tout en assurant leur protection, ce qui permet de réduire la masse et les coûts de ce couvercle, et optimise l’utilisation du volume intérieur du caisson 8. 054. In particular, a cover 14 can be formed comprising a surface area of more than 1 m 2 , formed with a steel sheet less than one millimeter thick. A cover 14 is thus produced with a sheet of limited thickness which is arranged near the internal electrochemical elements 18 while ensuring their protection, which makes it possible to reduce the mass and costs of this cover, and optimizes the use of the internal volume of the box 8.

Claims

REVENDICATIONS
1. Caisson de batterie de traction de véhicule automobile électrique ou hybride formant un ensemble plat sensiblement rectangulaire, présentant un axe longitudinal (A) comportant une direction avant du véhicule (AV), le caisson (8) comprenant une tôle métallique de couvercle (14), fixée par son contour à un bac de batterie, qui dispose de nervures (16, 30) réalisées dans son épaisseur, caractérisé en ce que le couvercle (14) comporte dans une partie centrale un renfort (20), et comporte de chaque côté par rapport à l’axe longitudinal (A), sur au moins une partie de la longueur de ce couvercle (14), en partant vers l’extérieur du véhicule, d’abord des nervures longitudinales (30), puis des nervures inclinées (16) suivant une direction qui vers l’extérieur est tournée vers l’arrière de ce véhicule. 1. Battery box for a traction vehicle of an electric or hybrid motor vehicle forming a substantially rectangular flat assembly, having a longitudinal axis (A) comprising a forward direction of the vehicle (AV), the box (8) comprising a metal cover sheet (14), fixed by its outline to a battery tray, which has ribs (16, 30) made in its thickness, characterized in that the cover (14) comprises in a central part a reinforcement (20), and comprises on each side relative to the longitudinal axis (A), over at least part of the length of this cover (14), starting towards the outside of the vehicle, first longitudinal ribs (30), then inclined ribs (16) in a direction which towards the outside is turned towards the rear of this vehicle.
2. Caisson de batterie selon la revendication 1 , caractérisé en ce que les nervures (16, 30) présentent une symétrie par rapport à l’axe longitudinal (A). 2. Battery box according to claim 1, characterized in that the ribs (16, 30) have symmetry with respect to the longitudinal axis (A).
3. Caisson de batterie selon la revendication 1 ou 2, caractérisé en ce que le renfort central (20) forme une nervure qui s’étend suivant l’axe longitudinal (A) sur plus de la moitié de la longueur du couvercle (14). 3. Battery box according to claim 1 or 2, characterized in that the central reinforcement (20) forms a rib which extends along the longitudinal axis (A) over more than half the length of the cover (14).
4. Caisson de batterie selon la revendication 3, caractérisé en ce que la nervure du renfort central (20) présente dans sa section transversale une largeur comprise entre 60 et 120mm, et une hauteur comprise entre 5 et 15mm. 4. Battery box according to claim 3, characterized in that the rib of the central reinforcement (20) has in its cross section a width of between 60 and 120 mm, and a height of between 5 and 15 mm.
5. Caisson de batterie selon l’une quelconque des revendications précédentes, caractérisé en ce qu'il comporte au moins deux nervures longitudinales (30) réparties sur la longueur du couvercle (14). 5. Battery box according to any one of the preceding claims, characterized in that it comprises at least two longitudinal ribs (30) distributed along the length of the cover (14).
6. Caisson de batterie selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte plusieurs nervures inclinées (16) réparties sur la longueur du couvercle (14), présentant des inclinaisons proches. 6. Battery box according to any one of the preceding claims, characterized in that it comprises several inclined ribs (16) distributed along the length of the cover (14), having similar inclinations.
7. Caisson de batterie selon la revendication 6, caractérisé en ce que les nervures inclinées (16) présentent une inclinaison comprise entre 30 et 60° par rapport à la direction transversale du véhicule. 7. Battery box according to claim 6, characterized in that the inclined ribs (16) have an inclination of between 30 and 60° relative to the transverse direction of the vehicle.
8. Caisson de batterie selon l’une quelconque des revendications précédentes, caractérisé en ce que chaque nervure inclinée (16) ou longitudinale (30) présente dans sa section transversale une hauteur comprise entre 2 et 6mm et une largeur comprise entre 30 et 50mm. 8. Battery box according to any one of the preceding claims, characterized in that each inclined (16) or longitudinal (30) rib has in its cross section a height of between 2 and 6 mm and a width of between 30 and 50 mm.
9. Caisson de batterie selon l’une quelconque des revendications précédentes, caractérisé en ce que la tôle de couvercle (14) réalisée en acier présente une surface supérieure à 1m2 et une épaisseur inférieure à 1 mm. 9. Battery box according to any one of the preceding claims, characterized in that the cover sheet (14) made of steel has a surface area greater than 1m 2 and a thickness less than 1 mm.
10. Véhicule automobile électrique ou hybride comportant une batterie intégrée dans un caisson (8) selon l’une quelconque des revendications précédentes, caractérisé en ce que ce caisson (8) est disposé à plat sous le plancher du véhicule (2) entre les trains avant et arrière. 10. Electric or hybrid motor vehicle comprising a battery integrated in a box (8) according to any one of the preceding claims, characterized in that this box (8) is arranged flat under the floor of the vehicle (2) between the front and rear axles.
PCT/FR2024/050281 2023-04-26 2024-03-07 Vehicle traction battery flat box provided with a cover with inclined reinforcing ribs WO2024223998A1 (en)

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Application Number Priority Date Filing Date Title
FR2304205A FR3148170A1 (en) 2023-04-26 2023-04-26 FLAT VEHICLE TRACTION BATTERY BOX EQUIPPED WITH A COVER WITH INCLINED REINFORCING RIBS
FRFR2304205 2023-04-26

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WO2024223998A1 true WO2024223998A1 (en) 2024-10-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304205A1 (en) 1975-03-13 1976-10-08 Szemes Paul Fluid or water dirve system for the generation of electrical energy - paddle and endless chain transmission system is used to drive generators
CN200969361Y (en) 2006-09-26 2007-10-31 比亚迪股份有限公司 Lithium ionic cell housing and lithium ionic cell including the same
CN208014769U (en) * 2018-03-15 2018-10-26 合肥国轩高科动力能源有限公司 Battery box of power automobile
EP3876339A1 (en) * 2019-08-07 2021-09-08 Lg Energy Solution, Ltd. Battery pack cover having uneven surface structure and battery pack comprising same
EP4024572A1 (en) * 2020-04-29 2022-07-06 Lg Energy Solution, Ltd. Battery pack having enhanced efficiency and stability of cooling fluid channel structure and vehicle comprising same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304205A1 (en) 1975-03-13 1976-10-08 Szemes Paul Fluid or water dirve system for the generation of electrical energy - paddle and endless chain transmission system is used to drive generators
CN200969361Y (en) 2006-09-26 2007-10-31 比亚迪股份有限公司 Lithium ionic cell housing and lithium ionic cell including the same
CN208014769U (en) * 2018-03-15 2018-10-26 合肥国轩高科动力能源有限公司 Battery box of power automobile
EP3876339A1 (en) * 2019-08-07 2021-09-08 Lg Energy Solution, Ltd. Battery pack cover having uneven surface structure and battery pack comprising same
EP4024572A1 (en) * 2020-04-29 2022-07-06 Lg Energy Solution, Ltd. Battery pack having enhanced efficiency and stability of cooling fluid channel structure and vehicle comprising same

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