Hitachi Automotive Systems, Ltd.

Nissan Motor Company Limited

Hitachi Vehicle Energy, Ltd.

Vehicle Energy Japan Inc.

Chikara Kikkawa

Hiroshi Hoshi

Toshiyuki Yoshida

Tsunemi Aiba

Naoki Kojima

Nayuta Yamachi

Yoshiyuki Tanaka

Shigeyuki Kiyota

Toyoki Iguchi

Hiroaki Saitou

Takeshi Haga

Hiroshi Iwata

Hiroaki Hashimoto

Masayoshi Saeki

Akira Kotaki

Takashi Kobune

Eisuke Sengoku

Toshikazu Maeshima

A battery pack cooling system includes a plurality of cells disposed in an internal space of a battery pack case so as to form a cooling passage configured to cool the cell modules by cooling air flowing in the cooling passage. The cooling passage includes a cooling air inlet passage, a cooling air exhaust passage, and a plurality of cooling branch passages disposed to connect the cooling air inlet passage and the cooling air exhaust passage in parallel. A minimum temperature sensor is disposed in the upstream position to measure a lowest temperature region in a first cell module. A maximum temperature sensor is disposed in the downstream position which becomes a highest temperature region in the first cell module. Another temperature sensor is disposed in a second cell module to measure the temperature of either the highest temperature or the lowest temperature in the second cell module.

Battery pack cooling system

A battery pack cooling system includes a plurality of cells disposed in an internal space of a battery pack case so as to form a cooling passage configured to cool the cell modules by cooling air flowing in the cooling passage. A first temperature sensor is a minimum temperature sensor disposed in the upstream position which becomes a lowest temperature. A second temperature sensor is a maximum temperature sensor disposed in the downstream position which becomes a highest temperature. A third temperature sensor is configured to measure the temperature of either the highest temperature or the lowest temperature disposed in a second cell module. A cooling passage includes a cooling air inlet passage, a cooling air exhaust passage, and a plurality of cooling branch passages disposed to connect the cooling air inlet passage and the cooling air exhaust passage in parallel.

A cell block includes holding sections that hold a battery cell arrayed body of a lower layer between a lower holding frame member and a middle holding frame member, hold a battery cell arrayed body of an upper layer between the middle holding frame member and an upper holding frame member, and hold the battery cell arrayed body of the upper layer and the battery cell arrayed body of the lower layer in a state displaced from each other in the row direction. Lower fastening sections are disposed at positions below a battery cell and projects in the row direction beyond the battery cell arrayed body of the lower layer, and join the lower holding frame member and the middle holding frame member with each other by fastening.

Cell block

Provided are a battery block and a secondary battery module capable of holding a plurality of battery cells stably and so reducing a load applied to a welding part of a conductive member that is connected to an electrode by welding or the like. The battery block includes a lower holding frame and a middle holding frame, one of which includes two protrusions that are in contact with an outer peripheral face of each battery cell and the other includes a pressing part that presses the outer peripheral face of the battery cell inwardly in the radial direction. Then, one of an upper holding frame and the middle holding frame includes two protrusions that are in contact with an outer peripheral face of each battery cell and the other includes a pressing part that presses the outer peripheral face of the battery cell inwardly in the radial direction.

Battery block and secondary battery module

The purpose of the present invention is to provide a battery block capable of reducing stress acting on a connection portion due to thermal expansion/contraction or size error. A battery block () according to the present invention includes: a plurality of conductive members () arranged along side surfaces () of a holding case () and electrically connecting corresponding battery cells (); voltage detection boards () disposed opposite the side surfaces () of the holding case () and detecting the voltage of the battery cells (); and a plurality of voltage detection terminals () respectively electrically connected to a plurality of conductive members () disposed on the voltage detection boards (). In the voltage detection terminals (), a securing portion () secured to the voltage detection boards () and a connection portion () connected to the conductive members () are disposed along an arranged direction, with a bend portion () which is elastically deformable in at least the arranged direction disposed between the securing portion () and the connection portion ().

A secondary battery moduleof the present invention stores cell blocksin a module case, and cools battery cellsin the cell blocksby circulating coolant to the inside of the cell blocks by introduction of the coolant into the module case. The secondary battery module has a structure of communicating coolant circulation portsthat open to a case wall sectionof the module caseand coolant circulation portsthat open to the cell blockswith each other by a communication member, and passing wiring through a space regionformed outside the communication memberand between the case wall sectionand the cell blocks. Thus, wiring can be executed without interfering flow of the coolant, and the total secondary battery modulecan be miniaturized.

Secondary battery module

Battery module

Growing community of inventors

Hitachinaka, Japan

Chikara Kikkawa