JPH11301285A - Battery accommodating case of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify wiring for heating batteries and to stably dispose each battery in a predetermined method by forming a plurality of concaves, imbedding the batteries in the respective concaves and providing a conductive plane heating element which generates heat with current carried in it so that it may heat each battery. SOLUTION: A plane heating element 10 is formed by providing a plurality of concaves 12 arranged by a lattice partition, and batteries 13 for a motive power of an electric automobile are imbedded in the respective concaves 12. These batteries 13 for a motive power are accommodated in a case 15 made of a reinforced plastic through a hard foaming heat insulator 14, and the case 15 is loaded at mountable and removable in a car body of the electric automobile from below. Further, in the case where the batteries 13 for a motive power are unsuitable for charging because of its low temperature, the batteries 13 for a motive power are so heated as to be charged by applying voltage to a space between a plurality of conductive resin films constituting the plane heating element 10 by an external power source 30 and making resistances between the conductive resin films generate heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle, and more particularly, to a battery storage case having heating means for a power battery.

[0002]

2. Description of the Related Art A power battery in an electric vehicle has a low outside temperature and is low in temperature, so that a chemical reaction inside the battery becomes slow and a sufficient charge cannot be performed.
If the battery causes the vehicle to travel shorter, and the battery electrolyte freezes due to the extremely low temperature, normal charging becomes impossible, so the battery is heated by a heater or the like to thaw the electrolyte. It is necessary to charge from.

On the other hand, a plurality of power batteries used in electric vehicles tend to be deteriorated at high temperatures due to heat generated during use. Therefore, heat dissipation during use of the batteries is ensured, and a plurality of power batteries are used when the vehicle is running. In order to prevent collisions between the batteries, it is necessary to keep an interval between the batteries. Conventionally, as shown in FIG.
And each heating element 2 is connected by an electric wire 3,
When necessary, each heating element 2 is energized by an auxiliary battery mounted on the vehicle or an external power supply 4 to heat each battery 1.

However, since a large number of batteries 1 are usually mounted on an electric vehicle, each battery 1 has a heating element 2.
Is not always easy to fix each battery 1 in a predetermined arrangement, and it is rather complicated to connect a large number of heating elements 2 properly, and at the same time, the space for complicated wiring is complicated. In addition, it is necessary to worry about poor insulation of wiring, disconnection, and the like.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to simplify the wiring required for heating a plurality of power batteries in an electric vehicle and to stably arrange the batteries as required. Things.

[0006]

For this reason, the battery housing case of the electric vehicle according to the present invention has a plurality of recesses formed therein, and the batteries are fitted into the respective recesses. And a conductive sheet heating element for heating the heating element.

[0007] Therefore, when the sheet heating element generates heat by being energized by the power supply, the batteries fitted into the respective recesses of the sheet heating element can be heated simultaneously, and each battery can be heated by the sheet heating element. By fitting into each of the recesses, a plurality of batteries can be easily and stably arranged at positions defined by the recesses.

[0008]

Embodiments of the present invention will be described below. 1 to 3, the sheet heating element 10 is
A plurality of recesses 12 arranged by the grid-like partition 11 are formed, and power batteries 13 of the electric vehicle are fitted into the recesses 12, respectively. Reinforced plastic case 1
5, and a case 15 is detachably mounted on a vehicle body (not shown) of the electric vehicle from below.

Further, as shown in FIG. 4, the sheet heating element 10 has an insulating layer 2 which is partially replaced with a resistor 20.
1 is sandwiched between the conductive resin films 22, 22, and the insulating films 23, 2
3 has a multi-layer structure with the resistor 2
0, the insulating layer 21, the conductive resin films 22, 22, and the insulating films 23, 23 are each flexible, so that the sheet heating element 10 is entirely flexible and elastic.

The resistor 20 is capable of generating heat when energized. The resistor 20 is disposed at a portion corresponding to the side and bottom of each recess 12 into which the power battery 13 is fitted. An insulating layer 21 is provided to insulate the conductive resin films 22 from each other.

The electric resistance of the conductive resin films 22 and 22 is small, and an auxiliary battery of an electric vehicle or an external power supply 30 is connected to both side surfaces of the resistor 20 to supply power to the resistor 20. And insulating films 23, 2
Numeral 3 secures insulation between the conductive resin films 22 and 22 and the outside, and also secures moisture resistance and chemical resistance of the sheet heating element 10.

Therefore, when it is determined that the charging of the batteries 13 is inappropriate because the respective batteries 13 are relatively low in temperature,
When a voltage is applied between the conductive resin films 22 and 22 by the auxiliary battery of the electric vehicle or the external power supply 30, the resistor 20 other than the insulating layer 21 is energized and the resistor 20 generates heat. When the battery 13 fitted into the place 12 and in close contact with the sheet heating element 10 is heated from its side and bottom surfaces, and a temperature sensor (not shown) determines that the temperature of the battery 13 has risen to an appropriate level for charging, A charging device (not shown) is activated, and charging of each battery 13 is started.

In this case, since the resistors 20 of the respective parts generate heat uniformly and rise in temperature, the batteries 13 in close contact with the planar heating element 10 are simultaneously and evenly heated, so that the batteries 13 can be sufficiently heated. , The mileage of the electric vehicle can be easily extended.

In addition, the resistor 20 and the conductive resin film 2
Since the wires 2 and 22 are formed in a planar shape, no interruption of current supply such as disconnection in a normal conductive wire occurs at all in the resistor 20 and the conductive resin films 22 and 22, and each battery 13 can be reliably heated. There is a feature, and the sheet heating element 10 is integrally formed as a whole, and wiring between the heating elements as in the above-described conventional device is completely unnecessary. This is very convenient because there is no need to worry about the complexity associated with wiring, securing a space for complicated wiring, or poor wiring insulation.

Each of the batteries 13 is provided with a sheet heating element 1.
0, it is elastically fitted into each recess 12, so that the adhesion between each battery 13 and the recess 12 is good, so that the heat conduction from the planar heating element 10 to each battery 13 is good. While each battery 13 can be efficiently heated with relatively little electric power, each battery 13 is correctly positioned at an appropriate interval corresponding to the position of each recess 12 formed in the planar heating element 10.
In addition, the battery 13 can be fixed very easily, and an appropriate space can be easily secured between the batteries 13, and the cooling performance of the batteries 13 during use of the batteries 13 is not impaired.

Further, since the sheet heating element 10 itself is flexible and elastic, each battery 13 fitted into the recess 12 is elastically supported.
Vibration and impact received by each battery 13 due to running of the electric vehicle or the like are easily absorbed, and the durability of each battery 13 can be reliably improved.

The planar heating element in the above embodiment is made of a conductive carbon-containing rubber having an appropriate internal electric resistance, and heat is appropriately generated by energizing the rubber to raise the temperature as a whole. In any case, it is needless to say that the same operation and effect as in the above embodiment can be obtained.

[0018]

In the battery storage case of the electric vehicle according to the present invention, the conductive sheet heating elements for a plurality of batteries are integrally formed so that each battery can be heated simultaneously and evenly. In addition to this, there is the convenience that wiring between the batteries is not required, and the batteries are easily fitted in the respective recesses formed in the sheet heating element, so that a plurality of batteries can be easily and stably provided. Can be placed in
From this aspect, there are many advantages.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram in an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is a vertical sectional view of a main part of the embodiment.

FIG. 4 is a partial explanatory view of the embodiment.

FIG. 5 is a schematic layout diagram of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Planar heating element 12 Concavity 13 Battery 15 Case 30 Power supply

Claims (2)

[Claims] 1. A battery storage case for an electric vehicle, comprising a plurality of recesses, a battery being fitted into each of the recesses, and a conductive planar heating element that generates heat when energized and heats the battery. 2. The battery storage case for an electric vehicle according to claim 1, wherein the planar heating element has elasticity.