CN-122000548-A - Fan driving method

Abstract

The invention aims to drive a fan arranged in a battery pack without affecting drivability and increasing the volume of an ECU. A fan driving method, wherein a cooler temperature is obtained from a thermoelectric element which detects a cooler temperature which is a temperature of a battery cell group which is arranged in a battery pack and detects a temperature of a high temperature part which is a temperature of a high temperature part different from the battery cell group, the cooler temperature and the high temperature part temperature are obtained, a fan arranged in the battery pack is started according to a temperature difference, and the air quantity of the fan is adjusted according to the temperature difference.

Inventors

• Shinyo Sugiura

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251023

Priority Date

20241108

Claims (1)

1. 1. A method for driving a fan is characterized in that, Detecting a temperature of a cooler that cools a battery cell stack provided in a battery pack, that is, a cooler temperature, and detecting a thermoelectric element that is a temperature of a high temperature portion different from the battery cell stack, that is, a high temperature portion temperature, to obtain a temperature difference between the cooler temperature and the high temperature portion temperature, According to the temperature difference, a fan arranged on the battery pack is started, And adjusting the air quantity of the fan according to the temperature difference.

Description

Fan driving method Technical Field The invention relates to a fan driving method. Background In the battery pack described in patent document 1, a plurality of unit cells are stored in a sealed internal space, and the stored unit cells can be cooled effectively. In order to solve the problem, an insertion hole is formed in the housing to communicate the internal space with the external space outside the housing, and a rotation shaft of the motor is inserted into the insertion hole. The motor drives an internal fan disposed in the internal space of the housing, and thus the air in the internal space can be circulated by the internal fan to cool each unit. Further, since the rotary shaft is disposed through the insertion hole, the external fan can be provided on the rotary shaft protruding from the housing to the outside. Thus, the 1 motor can cool not only the inside of the casing but also the outside of the casing by providing the fan. Patent document 1 Japanese patent application laid-open No. 2014-229560 Disclosure of Invention In patent document 1, it is necessary to supply electric power for driving the fan from electric power for driving the vehicle each time. Therefore, driving performance is affected by driving the fan. A temperature sensor is required for fan control, and this causes an increase in the cost of adding the temperature sensor. Control logic for turning on and off the fan needs to be integrated into the ECU (Electronic Control Unit: electronic control unit), and thus the control circuit of the ECU becomes complicated. With such addition of functions, the ECU substrate increases in volume, and a connector for connecting the fan and the ECU may be required to be added, so that the ECU main body increases in volume. The invention aims to drive a fan arranged in a battery pack without affecting drivability and without increasing the volume of an ECU. The present invention provides a fan driving method, wherein a temperature of a cooler for cooling a battery cell group provided in a battery pack is detected, and a temperature difference between the cooler temperature and the temperature of a high temperature portion is obtained by a thermoelectric element for detecting the temperature of the high temperature portion different from the battery cell group, and a fan provided in the battery pack is started according to the temperature difference, and an air volume of the fan is adjusted according to the temperature difference. Effects of the invention According to the present invention, the fan disposed in the battery pack can be driven without affecting drivability and without increasing the volume of the ECU. Drawings Fig. 1 is a schematic configuration diagram showing the structure of a battery pack according to the present embodiment. Fig. 2 is a schematic configuration diagram showing the structure of a battery pack according to a modification. Fig. 3 is a schematic configuration diagram showing the structure of a battery pack according to a modification. Detailed Description Hereinafter, this embodiment will be described with reference to the drawings. For the convenience of understanding the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and repetitive description thereof will be omitted. The Battery pack P1 shown in fig. 1 is provided in an electric vehicle such as an electric vehicle (Battery ELECTRIC VEHICLE: BEV) or a Plug-in Hybrid ELECTRIC VEHICLE: PHEV) that requires a large Battery pack. For example, when the battery pack P1 is mounted on a plug-in hybrid vehicle, the vehicle-side heat (radiant heat from an exhaust pipe, hot air from an engine compartment) is brought into a high-temperature state. The battery pack P1 may generate heat by devices provided therein, thereby causing thermal interference therein. For example, it is assumed that the ambient temperature outside the battery pack P1 becomes about 90 ℃. The battery pack P1 according to the present embodiment is provided with a battery cell stack 10, a cooler 11, a device 12, a fan 13, and a thermoelectric element 14. The battery cell stack 10 is composed of a plurality of batteries. The cooler 11 is a cooler for cooling the battery cell stack 10. In the case of the present embodiment, the temperature of the cooler 11 is about 20 ℃. The device 12 is a device provided in the battery pack P1. The fan 13 is a fan for circulating air in the battery pack P1. The thermoelectric element 14 is disposed such that one surface is in contact with the inner peripheral wall of the battery pack P1 and the other surface is in contact with the cooler 11. The thermoelectric element 14 is an element that generates an electromotive force when one surface is heated and the other surface is cooled to generate a temperature difference by the seebeck effect. For example, if a thermoelectric element 14 having a size of 2cm×2cm is used, a maximum of 2W of electric power can