TECHNICAL FIELD

The present disclosure relates to a method for manufacturing a battery module.

BACKGROUND ART

Secondary batteries which are highly applicable to various products and exhibit superior electrical properties such as high energy density, etc. are commonly used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electrical power sources. The secondary battery is drawing attentions as a new energy source for enhancing environment friendliness and energy efficiency in that the use of fossil fuels can be reduced greatly and no byproduct is generated during energy consumption.

Secondary batteries widely used at the preset include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries and the like. An operating voltage of the unit secondary battery cell, namely a unit battery cell, is about 2.5V to 4.5V. Therefore, if a higher output voltage is required, a plurality of battery cells may be connected in series to configure a battery pack. In addition, depending on the charge/discharge capacity required for the battery pack, a plurality of battery cells may be connected in parallel to configure a battery pack. Thus, the number of battery cells included in the battery pack may be variously set according to the required output voltage or the demanded charge/discharge capacity.

Meanwhile, when a plurality of battery cells are connected in series or in parallel to configure a battery pack, it is common to configure a battery module composed of at least one battery cell first, and then configure a battery pack by using at least one battery module and adding other components.

In the case of the conventional battery module, the technology for efficiently cooling the heat generated at the battery cells is becoming more and more important as the demanded battery capacity is increasing.

For the efficient cooling, in the conventional battery module, a thermally conductive adhesive is applied to the inside of a module case to stably fix a battery cell assembly including at least one battery cell in the module case and to improve thermal conductivity.

However, in the conventional battery module, when an injection hole for injecting the thermally conductive adhesive into the module case is formed, the battery cell assembly in the module case may be damaged due to burr or the like, or an injection nozzle for injecting the thermally conductive adhesive may not be accurately inserted into the injection hole, or the thermally conductive adhesive may leak out of the module case.

DISCLOSURE

Technical Problem

The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a method for manufacturing a battery module, which may enhance the thermally conductive adhesive injecting efficiency and prevent a battery cell assembly from being damaged, in a battery module that is cooled using the thermally conductive adhesive.

Technical Solution

In one aspect of the present disclosure, there is provided a method for manufacturing a battery module, comprising: accommodating a battery cell assembly having at least one battery cell in a module case; and injecting a thermally conductive adhesive through at least one injection hole provided in a bottom portion of the module case so that the module case is coated with the thermally conductive adhesive.

The method for manufacturing a battery module may further include arranging the module case in a horizontal direction, before the thermally conductive adhesive is injected.

The at least one injection hole may be provided at a middle region of the bottom portion of the module case.

The method for manufacturing a battery module may further include arranging the module case in a vertical direction, before the thermally conductive adhesive is injected.

The at least one injection hole may be provided at one side rim region of the bottom portion the module case.

The injection hole may be provided in plural, and the plurality of injection holes may be spaced apart from each other by a predetermined distance at the bottom portion of the module case.

Convex portions and concave portions may be formed alternately at an inner surface of the bottom portion of the module case, and the plurality of injection holes may be provided in the convex portions.

The convex portions and the concave portions may have a rounded shape.

The plurality of injection holes may have an inclined chamfer portion at one side thereof.

The plurality of injection holes may have different spacing distances in an outer direction from the center of the bottom portion of the module case.

Advantageous Effects

According to various embodiments as above, it is possible to provide a method for manufacturing a battery module, which may enhance the thermally conductive adhesive injecting efficiency and prevent a battery cell assembly from being damaged, in a battery module that is cooled using the thermally conductive adhesive.

