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CN-122000610-A - Battery assembly and motor vehicle with improved sealing performance

CN122000610ACN 122000610 ACN122000610 ACN 122000610ACN-122000610-A

Abstract

The invention relates to a battery assembly (11) comprising a cell stack (12, 14) having at least one cell (16) with an openable cell vent (22), a carrier plate (20) having a first carrier side (20 a), a second carrier side (20 b) and a through region (24, 26) opposite the openable cell vent as part of a carrier plate vent region (42'), a protective plate (28, 30) arranged below the carrier plate and facing the second carrier side, and a first vent chamber (32) between the protective plate and the carrier plate. The battery assembly comprises a sealing layer (36, 38) which is arranged on the second support side, covers the exhaust region and separates the exhaust region from the first exhaust chamber, wherein a second exhaust chamber (32') is formed or can be formed in the exhaust state between the exhaust region and the sealing layer, such that the second exhaust chamber is only temporarily fluidically separated from the first exhaust chamber in the exhaust state.

Inventors

  • M durham
  • R. HYDE
  • F. KELLER

Assignees

  • 奥迪股份公司

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241106

Claims (10)

  1. 1. A battery assembly (11) for a motor vehicle, the battery assembly comprising: -a battery cell group (12, 14) having at least one battery cell (16) with an openable battery cell exhaust port (22); -a carrier plate (20) having a first carrier side (20 a), a second carrier side (20 b) opposite the first carrier side (20 a) and at least one through region (24, 26) associated with the at least one cell (16), wherein the at least one cell (16) is arranged on the first carrier side (20 a) such that an openable cell exhaust opening (22) is directed towards the first carrier side (20 a) and opposite the through region (24, 26), wherein the carrier plate (20) has an exhaust region (42') in which the through region (24, 26) is arranged; -a protective plate (28, 30) arranged below the carrier plate (20) in a specific direction (z) and facing a second carrier side (20 b) of the protective plate (28, 30), and A first exhaust chamber (32) between the protective plate (28, 30) and the carrier plate (20), into which, in the exhaust state, gas escaping from the openable battery exhaust opening (22) can be introduced via the pass-through region (24, 26), It is characterized in that the method comprises the steps of, The battery assembly (11) comprises a sealing layer (36, 38) which is arranged on the second carrier side (20 b), which is joined in a sealing manner to the second carrier side (20 b) along at least one sealing contour (44) which extends in a sealing manner around the venting area (42 ') of the carrier plate (20), which covers the venting area (42') and isolates the venting area from the first venting chamber (32), Wherein between the venting region (42 ') and the sealing layer (36, 38) a second venting chamber (32') is formed or can be formed in the venting situation, -Wherein the battery assembly (11) is designed such that the second exhaust chamber (32 ') is only temporarily fluidly isolated from the first exhaust chamber (32) in the exhaust situation, and a fluid connection between the first exhaust chamber (32) and the second exhaust chamber (32') is established in the exhaust situation.
  2. 2. The battery assembly (11) according to claim 1, characterized in that the sealing layer (36, 38) is bowl-shaped, such that a gap is formed between the sealing layer (36, 38) and the venting area (42 '), which gap forms the second venting chamber (32').
  3. 3. The battery assembly (11) according to any of the preceding claims, characterized in that the sealing layer (36, 38) is arranged on the carrier plate (20) such that, in the event of a venting, the sealing layer is at least partially detached from the carrier plate (20) due to temperature and/or due to pressure and thereby establishes a fluid connection between the second venting chamber (32') and the first venting chamber (32).
  4. 4. The battery assembly (11) according to any of the preceding claims, characterized in that the sealing layer (36, 38) is designed such that, in the event of venting, the sealing layer is at least partially destroyed by temperature and/or by pressure and thereby a fluid connection between the second vent chamber (32') and the first vent chamber (32) is established.
  5. 5. The battery assembly (11) according to any of the preceding claims, wherein the sealing layer (36, 38) is designed to be shape stable.
  6. 6. The battery assembly (11) according to any of the preceding claims, wherein the sealing layer (36, 38) is designed to be flexible and/or elastic.
  7. 7. The battery assembly (11) according to any of the preceding claims, characterized in that a sealing layer (36, 38) is applied to the venting region (42 ') and is designed to form the second venting chamber (32') in the event of venting due to gas escaping from the cell vent (22).
  8. 8. The battery assembly (11) according to any of the preceding claims, wherein the sealing layer (36, 38) is made of or comprises plastic.
  9. 9. The battery assembly (11) according to any of the preceding claims, wherein the battery assembly (11) comprises a plurality of battery cells (16) each having an openable battery cell vent (22) opposite a corresponding through region (24, 26) of the carrier plate (20), wherein the through region (24, 26) is arranged in a vent region (42 '), in particular wherein the battery assembly (11) comprises a plurality of battery cell groups, wherein each battery cell group (12, 14) is associated with one vent region (42 ') of the carrier plate (20), each battery cell group (12, 14) being associated with one sealing layer (36, 38) arranged on the carrier plate (20) in such a way as to cover the vent region (42 ') of the carrier plate (20) associated with the battery cell group (12, 14).
  10. 10. A motor vehicle having a battery assembly (11) according to any of the preceding claims.

Description

Battery assembly and motor vehicle with improved sealing performance Technical Field The invention relates to a battery assembly for a motor vehicle, comprising a battery cell group having at least one battery cell with an openable battery cell exhaust opening. Furthermore, the battery assembly comprises a carrier plate having a first carrier side, a second carrier side opposite the first carrier side and at least one through region associated with at least one cell, wherein the at least one cell is arranged on the first carrier side such that the openable cell exhaust opening is oriented towards the first carrier side and opposite the through region. In addition, the battery assembly comprises a protective plate which is arranged below the carrier plate in a specific direction and faces the second carrier side of the carrier plate, and a first exhaust chamber between the protective plate and the carrier plate, into which, in the exhaust case, gas escaping from the openable cell exhaust opening can be introduced via the pass-through region. The invention further relates to a motor vehicle having such a battery assembly. Background Batteries, such as high voltage batteries for motor vehicles, typically include a plurality of individual cells. Each of these individual cells may experience thermal runaway (Thermal Runaway) for various reasons. The aim here is to keep the cells as immune as possible from such thermal runaway. For this purpose, specific cell chemistries can be used or the cell housing can be designed to be as robust as possible. Furthermore, the cell housing may include targeted weak points, which are also referred to as cell vents, and which are referred to herein as openable cell vents. In the case of thermal runaway, these weak points allow targeted venting or targeted burning out of the cells. Other measures can also be taken, such as targeted insulation between the cells, e.g. by inter-cell material, by protection of charged surfaces, etc. The propagation of thermal runaway from one cell to the other can generally be delayed or even prevented by these measures. Stopping after the X-th cell thermal runaway is also referred to as "stopping heat propagation (Thermal propagation)". Stopping after the first thermal runaway cell is also referred to as "No heat propagation (No-TP)", that is, no heat transfer to the other cells occurs. In order to be able to achieve a targeted venting of the thermal runaway cells, it is advantageous to connect the cell vent to a venting volume which enables a targeted venting and cooling of the harmful gases. In this case, the connection should ideally be such that the venting behavior of the thermal runaway cell is not blocked. A thermal runaway cell being plugged at a cell vent may result in undesirable through-burning at other cell locations. In order to provide as free an exhaust of the thermal runaway cell as possible and to output harmful gases via the exhaust volume, an opening or interface may be provided between the exhaust chamber and the cell vent. Free venting into the environment rather than into the exhaust chamber is undesirable because of the high oxygen content of the environment and the immediate attendant fire in the vehicular environment. These interfaces or openings between the cells and the exhaust chamber can be realized, for example, as perforated plates, in which each cell is located on the plate in the region of a cell vent in a freely cutting manner. Larger cutouts over a larger number of cells are also possible. If the cell vent is directed downward in the vertical direction of the vehicle, the space above the floor protection, in particular of the motor vehicle, can be used as an exhaust chamber. However, the difficulty here is that the battery compartment in which the battery cells are located must be reliably protected against the ingress of water, dust, pollutants etc., whereas the bottom protection device is immediately adjacent to the environment of the motor vehicle and is in turn particularly vulnerable to the potential ingress of water or dirt etc. Sealing the bottom protection device with respect to the battery is extremely difficult due to the size of the battery and the corresponding size of the bottom protection device. Sealing in the region of the cell or of the through-holes is also not easy, since it must be ensured that the cell can be vented freely and is not blocked by a watertight sealing structure located directly on the cell. Conversely, the sealing structure cannot be constructed so thin that its sealing effect is not lost during its service life. The costs required to achieve a high-voltage battery in order to achieve tightness have been enormous to date due to factors such as large cell geometry, component tolerances, reversible and irreversible cell growth, thermal influences, driving movements, etc. DE 10 2022 121 801 A1 describes a battery having a battery cell and a battery housing, the battery housing having