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CN-122029664-A - Battery device

CN122029664ACN 122029664 ACN122029664 ACN 122029664ACN-122029664-A

Abstract

The technical idea of the present invention provides a battery device including a case, a battery cell assembly disposed within the case and including a plurality of battery cells, a first heat conductive adhesive layer for attaching a first region of the battery cell assembly to the case, and a second heat conductive adhesive layer for attaching a second region of the battery cell assembly to the case, wherein a thermal conductivity of the first heat conductive adhesive layer is greater than a thermal conductivity of the second heat conductive adhesive layer, and an adhesive strength of the first heat conductive adhesive layer is less than an adhesive strength of the second heat conductive adhesive layer.

Inventors

  • Xu Nanxun
  • Shen Zhouhuan

Assignees

  • 株式会社LG新能源

Dates

Publication Date
20260512
Application Date
20250829
Priority Date
20240909

Claims (15)

  1. 1. A battery device, the battery device comprising: A housing; a battery cell assembly disposed within the housing and comprising a plurality of battery cells; A first thermally conductive adhesive layer configured to attach a first region of the cell assembly to the housing, and A second thermally conductive adhesive layer configured to attach a second region of the cell assembly to the housing, Wherein the first thermally conductive adhesive layer has a thermal conductivity greater than the second thermally conductive adhesive layer, and Wherein the adhesive strength of the first thermally conductive adhesive layer is less than the adhesive strength of the second thermally conductive adhesive layer.
  2. 2. The battery device according to claim 1, wherein, Each of the plurality of battery cells includes a first portion relatively adjacent to the electrode lead and a second portion relatively remote from the electrode lead, Wherein the first thermally conductive adhesive layer contacts the first portion of each of the plurality of battery cells, and Wherein the second thermally conductive adhesive layer contacts the second portion of each of the plurality of battery cells.
  3. 3. The battery device according to claim 2, wherein, The cell assembly also includes a bus bar frame supporting the electrode leads of the plurality of battery cells.
  4. 4. The battery device of claim 2, further comprising: A third thermally conductive adhesive layer configured to attach a third region of the cell assembly to the housing, the third region being located between the first region and the second region of the cell assembly, Wherein the thermal conductivity of the third thermally conductive adhesive layer is between the thermal conductivity of the first thermally conductive adhesive layer and the thermal conductivity of the second thermally conductive adhesive layer, and Wherein the adhesive strength of the third thermally conductive adhesive layer is between the adhesive strength of the first thermally conductive adhesive layer and the adhesive strength of the second thermally conductive adhesive layer.
  5. 5. The battery device according to claim 1, wherein, Each of the plurality of battery cells includes a first peripheral portion, a second peripheral portion, and a central portion between the first peripheral portion and the second peripheral portion, Wherein the first thermally conductive adhesive layer contacts the first peripheral portion and the second peripheral portion of each of the plurality of battery cells, and Wherein the second thermally conductive adhesive layer contacts the central portion of each of the plurality of battery cells.
  6. 6. The battery device of claim 1, further comprising: A separation pad disposed between the first and second thermally conductive adhesive layers.
  7. 7. The battery device according to claim 6, wherein, The separator pad is in contact with the plurality of battery cells.
  8. 8. The battery device according to claim 1, wherein, The housing includes: A base frame supporting the cell assembly and including a cooling channel configured to allow a cooling fluid to flow, and A side frame provided on the base frame, Wherein the first and second thermally conductive adhesive layers are disposed between the cell assembly and the base frame.
  9. 9. The battery device of claim 8, further comprising: a spacer attached to the base frame and in contact with the plurality of battery cells, Wherein the first thermally conductive adhesive layer is spaced from the second thermally conductive adhesive layer, and the spacer is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.
  10. 10. The battery device according to claim 1, wherein, The housing includes: A base frame supporting the cell assembly, and A side cooling frame disposed between two adjacent battery cells among the plurality of battery cells, Wherein the first and second thermally conductive adhesive layers are in contact with at least one of the plurality of battery cells and the side cooling frame.
  11. 11. The battery device according to claim 10, wherein, The side cooling frame includes cooling channels configured to allow a cooling fluid to flow.
  12. 12. The battery device of claim 10, further comprising: a spacer attached to the side cooling frame, Wherein the first thermally conductive adhesive layer is spaced from the second thermally conductive adhesive layer, and the spacer is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.
  13. 13. The battery device according to claim 1, wherein, The housing further includes: A base frame supporting the cell assembly and attached to the first and second thermally conductive adhesive layers; A side cooling frame disposed between two adjacent battery cells among the plurality of battery cells; a first side thermally conductive adhesive layer configured to attach a first region of a respective battery cell of the plurality of battery cells to the side cooling frame, and A second side thermally conductive adhesive layer configured to attach a second region of a respective battery cell of the plurality of battery cells to the side cooling frame, Wherein the thermal conductivity of the first side thermally conductive adhesive layer is greater than the thermal conductivity of the second side thermally conductive adhesive layer.
  14. 14. The battery device according to claim 13, wherein, The adhesive strength of the first side thermally conductive adhesive layer is less than the second adhesive strength of the second side thermally conductive adhesive layer.
  15. 15. The battery device according to claim 1, wherein, The cell assembly further comprises: a pair of side beams spaced apart from each other with the plurality of battery cells therebetween, and A lifting strap secured to the pair of side rails and extending along bottom surfaces of the plurality of battery cells, Wherein the lifting strap is disposed between the second thermally conductive adhesive layer and the plurality of battery cells.

Description

Battery device Technical Field The present disclosure relates to a battery device. The present application claims the benefit of korean patent application No. 10-2024-0126212, filed on 9/2024, the disclosure of which is incorporated herein by reference. Background Unlike a primary battery, a secondary battery may be charged and discharged a plurality of times. Secondary batteries are widely used as energy sources for various wireless devices such as cellular phones, laptop computers, and cordless vacuum cleaners. Recently, the manufacturing cost per unit capacity of the secondary battery has been significantly reduced due to improvements in energy density and economies of scale. As the cruising range of Battery Electric Vehicles (BEV) has increased to a level comparable to that of fuel vehicles, the primary application of secondary batteries is being transferred from mobile devices to travel tools. As secondary batteries are used in travel applications, the demand for safety thereof has increased. If accidents such as fire occur in secondary batteries used in travel tools, they may endanger the lives of drivers. Therefore, research on a technology for improving the safety of the secondary battery is indispensable. Disclosure of Invention Technical problem The technical problem solved by the technical concept of the present disclosure is to provide a battery device. Technical proposal In order to solve the above problems, the technical idea of the present disclosure provides a battery device including a case, a battery cell assembly disposed within the case and including a plurality of battery cells, a first thermally conductive adhesive layer configured to attach a first region of the battery cell assembly to the case, and a second thermally conductive adhesive layer configured to attach a second region of the battery cell assembly to the case, wherein a thermal conductivity of the first thermally conductive adhesive layer is greater than a thermal conductivity of the second thermally conductive adhesive layer, and an adhesive strength of the first thermally conductive adhesive layer is less than an adhesive strength of the second thermally conductive adhesive layer. In an exemplary embodiment, each of the plurality of battery cells includes a first portion relatively adjacent to an electrode lead and a second portion relatively remote from the electrode lead, wherein the first thermally conductive adhesive layer contacts the first portion of each of the plurality of battery cells, and wherein the second thermally conductive adhesive layer contacts the second portion of each of the plurality of battery cells. In an exemplary embodiment, the cell assembly further includes a bus bar frame supporting the electrode leads of the plurality of battery cells. In an exemplary embodiment, the battery device further includes a third thermally conductive adhesive layer configured to attach a third region of the cell assembly located between the first region and the second region of the cell assembly to the housing, wherein a thermal conductivity of the third thermally conductive adhesive layer is between a thermal conductivity of the first thermally conductive adhesive layer and a thermal conductivity of the second thermally conductive adhesive layer, and wherein an adhesive strength of the third thermally conductive adhesive layer is between an adhesive strength of the first thermally conductive adhesive layer and an adhesive strength of the second thermally conductive adhesive layer. In an exemplary embodiment, each of the plurality of battery cells includes a first peripheral portion, a second peripheral portion, and a central portion located between the first peripheral portion and the second peripheral portion, wherein the first thermally conductive adhesive layer contacts the first peripheral portion and the second peripheral portion of each of the plurality of battery cells, and wherein the second thermally conductive adhesive layer contacts the central portion of each of the plurality of battery cells. In an exemplary embodiment, the battery device further includes a separation pad disposed between the first and second thermally conductive adhesive layers. In an exemplary embodiment, the separator pad is in contact with the plurality of battery cells. In an exemplary embodiment, the housing includes a base frame supporting the cell assembly and including cooling channels configured to allow cooling fluid to flow, and a side frame disposed on the base frame, wherein the first and second thermally conductive adhesive layers are disposed between the cell assembly and the base frame. In an exemplary embodiment, the battery device further includes a spacer attached to the base frame and in contact with the plurality of battery cells, wherein the first thermally conductive adhesive layer is spaced apart from the second thermally conductive adhesive layer, wherein the spacer is located between the first thermally cond