Cooling system for vehicle battery modules

JP7871736B2Active Publication Date: 2026-06-09TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2023-04-28
Publication Date
2026-06-09

AI Technical Summary

Benefits of technology

【0009】 本発明の電池モジュールの冷却装置によれば、前記冷却配管部により、前記バスバーの少なくとも一部と冷却液とが熱的に接するように前記冷却液が前記電池モジュール上で流通させられる。この結果、バスバーに接続された前記外部電極の電池セルの内部側部分と集電体との接合部等が効率的に冷却されるので、高い冷却効率が得られる。また、冷却配管部は、電気絶縁性を備えた管壁を有してバスバーの側面を覆う偏平な配管で、電池セルの配置方向に直交する方向と同様の幅寸法を有して、電池セルのバスバーが設けられている面上に配置されているため、バスバー間の絶縁性が維持されるとともに、電池モジュールの高さを増加させることがない。さらに、バスバーの側面に冷却液が直接接触させられるため、バスバーに接続された外部電極の電池セルの内部側部分と集電体との接合部等が効率的に冷却される。

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Abstract

To provide a cooling device of a vehicle battery module with a high cooling efficiency.SOLUTION: In a cooling device 10 of a battery module 12, a cooling liquid 48 is circulated on a battery module 12 by a cooling pipe unit 42 so that at least a part of a bus bar 40 will be thermally in contact with the cooling liquid. The joint part of an internal part of a battery cell 14 of one of a positive electrode external electrode 24 and a negative electrode external electrode 26 connected to the bus bar 40 and a laminate collector 18 is thus efficiently cooled, and the cooling efficiency of the cooling device 10 of the battery module 12 is enhanced.SELECTED DRAWING: Figure 1
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Claims

1. A cooling device for a vehicle battery module, in which multiple battery cells arranged in one direction are electrically connected to each other by busbars made of thick metal plates, and the battery module is cooled using a circulating coolant, A cooling piping section that guides the coolant onto the battery module such that at least a portion of the busbar and the coolant are in thermal contact, The battery cooling circuit includes the cooling liquid in the cooling piping section which is circulated between the cooling unit and the cooler to cool the busbar, The cooling piping section is a flat pipe having an electrically insulating pipe wall, which is arranged around the busbar so as to cover the side surface of the busbar. The cooling piping section has a width dimension similar to that in the direction perpendicular to the arrangement direction of the battery cells, and is arranged on the surface of the battery cell on which the busbar is provided. The cooling piping section has a pair of rectangular through-holes formed in each busbar that penetrate the busbar in the height direction, and the inner periphery of each pair of through-holes is sealed liquid-tightly to the side surface of the busbar with adhesive, so that the coolant comes into direct contact with the side surface of the busbar. A cooling device for vehicle battery modules, characterized by the following features.

2. The coolant consists of oil or ion-exchanged water whose electrical conductivity has been reduced by an ion-exchange membrane. A cooling device for a vehicle battery module according to feature 1.

3. The electrically insulating tube wall is a flexible sheet made of a resin layer, or a laminated sheet containing multiple types of layers including the resin layer. A cooling device for a vehicle battery module according to feature 1.