阅读说明：本技术 电池模块及包括该电池模块的电池组 (Battery module and battery pack including the same ) 是由 姜多荤 成准烨 朱宰贤 尹智秀 徐京湖 于 2020-07-06 设计创作，主要内容包括：根据本发明的一个实施方式的电池模块包括：电池单元堆,在所述电池单元堆中层叠有多个电池单元；容纳电池单元堆的模块框架；位于所述模块框架的下表面和所述电池单元堆之间的导热树脂层；以及位于所述多个电池单元中的相邻电池单元之间的第一粘合剂层,其中,模块框架包括形成在其底表面中以注入导热树脂的注入孔,并且第一粘合剂层形成为邻近导热树脂层。(A battery module according to an embodiment of the present invention includes: a battery cell stack in which a plurality of battery cells are stacked; a module frame accommodating the battery cell stack; a heat conductive resin layer between a lower surface of the module frame and the battery cell stack; and a first adhesive layer between adjacent ones of the plurality of battery cells, wherein the module frame includes injection holes formed in a bottom surface thereof to inject the heat conductive resin, and the first adhesive layer is formed adjacent to the heat conductive resin layer.)

1. A battery module, comprising:

a battery cell stack in which a plurality of battery cells are stacked;

a module frame accommodating the battery cell stack;

a heat conductive resin layer between a lower surface of the module frame and the battery cell stack; and

a first adhesive layer between adjacent battery cells among the plurality of battery cells,

wherein a liquid injection hole for injecting a heat conductive resin is formed on a lower surface of the module frame, and the first adhesive layer is formed adjacent to the heat conductive resin layer.

2. The battery module of claim 1, further comprising:

a compression pad between a side surface of the module frame and an outermost battery cell of the battery cell stack; and

a second adhesive layer between the outermost cell unit of the cell stack and the compression pad,

wherein the second adhesive layer is formed adjacent to the thermally conductive resin layer.

3. The battery module of claim 2, wherein at least one of the first adhesive layer and the second adhesive layer is in contact with the thermally conductive resin layer.

4. The battery module of claim 3, wherein the first and second adhesive layers are double-sided tape.

5. The battery module of claim 2, further comprising:

a barrier film between the battery cell stack and the thermally conductive resin layer.

6. The battery module of claim 5, wherein the barrier film covers the first and second adhesive layers.

7. The battery module of claim 5, wherein the barrier film comprises a plurality of barriers, and the plurality of barriers are separated from each other.

8. The battery module of claim 1, further comprising:

a bus bar frame covering front and rear surfaces of the module frame,

wherein the module frame covers upper, lower, left, and right surfaces of the battery cell stack.

9. The battery module according to claim 1, wherein upper and lower surfaces of the module frame face each other in a direction perpendicular to a stacking direction of the battery cell stack.

10. A battery pack comprising the battery module of claim 1.

Technical Field

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of korean patent application No. 10-2019-0145142, filed by 2019, month 11, day 13 to the korean intellectual property office, the disclosure of which is incorporated herein in its entirety by reference.

The present disclosure relates to a battery module and a battery pack including the same, and more particularly, to a battery module and a battery pack including the same, in which a thermally conductive resin is prevented from being additionally injected.

Background

The secondary battery is easily applied to various product groups and has electrical characteristics such as high energy density, which is commonly applied not only to portable devices but also to electric vehicles or hybrid electric vehicles driven by an electric drive source, an electric storage system, and the like. Such a secondary battery is attracting attention as a new environmentally friendly energy source for improving energy efficiency because it has a major advantage of significantly reducing the use of fossil fuels and does not generate byproducts using energy at all.

In small-sized mobile devices, each device uses one or more battery cells, whereas in medium-or large-sized devices, such as vehicles, since high output and large capacity are required, medium-or large-sized battery packs, in which a large number of battery cells are electrically connected, are used.

Preferably, the middle-or large-sized battery module is manufactured to have as small a size and weight as possible. Therefore, a prismatic battery or a pouch-shaped battery, which can be stacked with high integration and has a small weight to capacity ratio, is generally used as a battery cell of the middle-or large-sized battery module.

Fig. 1 is a perspective view illustrating a hole formed on the bottom of a frame in a battery module according to the related art. Fig. 2 is a perspective view illustrating a state in which the battery module of fig. 1 is turned upside down. Fig. 3 is a sectional view taken along line a-a of fig. 1. Fig. 4 is a plan view illustrating one battery cell included in fig. 3.

Referring to fig. 1 to 3, in order to protect the battery cell stack 15 from external impact, heat, or vibration, the battery module may include a module frame 10, the front and rear surfaces of which are opened to receive the battery cell stack 15 in the inner space of the module frame 10. The module frame 10 has an upper end 12 and a bottom 11. Referring to a state shown in fig. 1 in which the battery module of fig. 2 is turned upside down, a liquid injection hole 20 is formed in the bottom 10 of the module frame 11.

The cell stack 15 is an assembly formed by stacking a plurality of battery cells 14, which is mounted inside the battery module, and compression pads 18 are formed between the outermost battery cell 14 and the module frame 10 and between adjacent battery cells 14. In this case, the double-sided adhesive tape 25 is connected between the adjacent battery cells 14 and/or between the battery cells 14 and the compression pads 18. The double-sided adhesive tape 25 is located at the central portion of the battery cell 14, as shown in fig. 4.

The heat conductive resin may be injected between the battery cell stack 15 and the module frame 10 through the liquid injection hole 20, and the heat conductive resin layer 40 as shown in fig. 3 may be formed.

The heat conductive resin layer 40 may serve to transfer heat generated from the cell stack 15 to the outside of the battery module and to fix the cell stack 15 at the inside of the battery module. An inspection hole 30 may be further formed in the bottom 11 of the module frame 10, and more heat conductive resin than is required to be injected may be discharged to the outside of the battery module through the inspection hole 30 when the heat conductive resin is injected, through which the amount of the injected heat conductive resin may be confirmed.

Fig. 1 and 3 show a state in which the battery module is turned over 180 degrees to inject the heat conductive resin, and in this state, if the heat conductive resin is injected through the liquid injection hole 20, the heat conductive resin may penetrate into a space of the battery module except for the attachment portion of the double-sided adhesive tape 25 in an arrow direction. As shown in fig. 3, the heat conductive resin layer 40 includes a dummy resin layer 40P, and the dummy resin layer 40P may increase the amount of the heat conductive resin filling the space between the bottom 11 of the module frame and the battery cell stack 15 more than necessary.

Disclosure of Invention

Technical problem

The present disclosure is directed to solving the above-mentioned problems, and an object of the present disclosure is to provide a battery module preventing additional injection of a thermally conductive resin, a method of manufacturing the same, and a battery pack including the same.

However, the problems to be solved by the embodiments of the present disclosure are not limited to the above-described problems, and various extensions may be made within the scope of the technical idea included in the present disclosure.

Technical scheme

A battery module according to an embodiment of the present disclosure may include: a battery cell stack in which a plurality of battery cells are stacked; a module frame accommodating the battery cell stack; a heat conductive resin layer between a lower surface of the module frame and the battery cell stack; and a first adhesive layer between adjacent battery cells among the plurality of battery cells, and a liquid injection hole for injecting a heat conductive resin may be formed on a lower surface of the module frame, and the first adhesive layer may be formed adjacent to the heat conductive resin layer.

The battery module may further include: a compression pad between a side surface of the module frame and an outermost battery cell of the battery cell stack; and a second adhesive layer between the outermost battery cell of the battery cell stack and the compression pad, and the second adhesive layer may be formed adjacent to the thermally conductive resin layer.

At least one of the first adhesive layer and the second adhesive layer may be in contact with the thermally conductive resin layer.

The first adhesive layer and the second adhesive layer may be double-sided adhesive tapes.

The battery module may further include: a barrier film between the battery cell stack and the thermally conductive resin layer.

The barrier film may cover the first adhesive layer and the second adhesive layer.

The barrier film may include a plurality of barrier portions, and the plurality of barrier portions are separated from each other.

The battery module may further include: a bus bar frame covering front and rear surfaces of the module frame, and the module frame may cover upper, lower, left, and right surfaces of the battery cell stack.

The upper and lower surfaces of the module frame may face each other in a direction perpendicular to the stacking direction of the battery cell stack.

A battery pack according to another embodiment of the present disclosure may include the above battery module.

Advantageous effects

According to the embodiments, the attachment position of the adhesive layer may be adjusted to prevent the heat conductive resin from penetrating between the compression pad and the battery cell, thereby preventing an increase in cost due to additional injection of the heat conductive resin and reducing the weight of the battery module.

Drawings

Fig. 1 is a perspective view illustrating a hole formed on the bottom of a frame in a battery module according to the related art;

fig. 2 is a perspective view illustrating a state in which the battery module of fig. 1 is turned upside down;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 4 is a plan view illustrating one battery cell included in fig. 3;

fig. 5 is an exploded perspective view of a battery module according to an embodiment of the present disclosure;

fig. 6 is a view illustrating a state in which constituent elements of the battery module of fig. 5 are coupled to each other;

fig. 7 is a perspective view illustrating a state in which the battery module of fig. 6 is turned upside down;

FIG. 8 is a cross-sectional view taken along line B-B' of FIG. 7;

fig. 9 is a plan view showing one battery cell included in fig. 8;

fig. 10 is a sectional view of a battery module according to another embodiment of the present disclosure; and

fig. 11 is a sectional view showing a modified example of the barrier film of fig. 10.

Detailed Description

Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present disclosure may be modified in various different ways, and is not limited to the embodiments set forth herein.

Parts irrelevant to the description will be omitted to clearly describe the present disclosure, and like reference numerals denote like elements throughout the specification.

Further, in the drawings, the size and thickness of each element are arbitrarily shown for convenience of description, and the present disclosure is not necessarily limited to those shown in the drawings. In the drawings, the thickness of layers, regions, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and regions are exaggerated for convenience of description.

In addition, it will be understood that when an element such as a layer, film, region or panel is referred to as being "on" or "over" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, it is not intended that other intervening elements be present. Further, the words "on … …" or "above … …" mean disposed on or above the reference portion, and do not necessarily mean disposed at the upper end of the reference portion toward the opposite direction of gravity.

Further, throughout the specification, when an element is referred to as "comprising" a certain element, it means that it may further comprise other elements, without excluding other elements, unless otherwise specified.

Further, throughout the specification, when referred to as "plane", it means when the target portion is viewed from the top, and when referred to as "section", it means when the target portion is viewed from the side of the cross section that is vertically cut.

Fig. 5 is an exploded perspective view of a battery module according to an embodiment of the present disclosure. Fig. 6 is a view illustrating a state in which constituent elements of the battery module of fig. 5 are coupled to each other. Fig. 7 is a perspective view illustrating a state in which the battery module of fig. 6 is turned upside down. Fig. 8 is a sectional view taken along line B-B' of fig. 7. Fig. 9 is a plan view illustrating one battery cell included in fig. 8.

Referring to fig. 5 and 6, the battery module according to the present embodiment includes: a battery cell stack 120 in which a plurality of battery cells 110 are stacked; and a module frame 100 accommodating the battery cell stack 120 and having a lower surface 101 and an upper surface 102 corresponding to each other, and a liquid injection hole 135 and/or an inspection hole 130 for injecting a heat conductive resin is formed on the lower surface 101 of the module frame 100.

The module frame 100 according to the present embodiment surrounds the remaining outer surfaces except the front and rear surfaces of the battery cell stack 120, the end plates 150 are located on the front and rear surfaces of the battery cell stack 120, respectively, and the bus bar frame 145 is located between the battery cell stack 120 and the end plates 150. The remaining surfaces other than the front and rear surfaces of the battery cell stack 120 may be the upper, lower, left and right surfaces of the battery cell stack 120. The upper surface 102 and the lower surface 101 of the module frame 100 may face each other in a direction perpendicular to the stacking direction of the battery cell stack 120. The stacking direction of the cell stack 120 may be the x-axis direction of fig. 5, and the direction perpendicular to the stacking direction may be the z-axis direction.

Referring to fig. 5 and 7, according to the present embodiment, a heat conductive resin layer 400 is located between the lower surface 101 of the module frame 100 and the battery cell stack 120. The heat conductive resin layer 400 may be formed by curing the heat conductive resin injected through the liquid injection hole 135, and may serve to transfer heat generated in the battery cell stack 120 to the outside of the battery module and fix the battery cell stack 120 at the inside of the battery module.

Referring to fig. 7 and 8, the battery module according to the present embodiment may further include an insulating cover 105 between the upper surface 102 of the module frame 100 and the cell stack 120. The insulating cover 105 may be formed of an injection molded material. A guide member 105D extending in a bar shape may be formed on an outer surface of the insulation cover 105. The guide member 105D may protrude in a direction in which the battery cell stack 120 is located, and may serve to guide the position of the battery cell stack 120 when the battery cell stack 120 is inserted into the module frame 100.

Referring to fig. 8, the battery module according to the present embodiment may further include a compression pad 180 located between the outermost battery cells 110 and the side surface portions of the module frame 100. The compression pad 180 may be formed of a polyurethane-based material. The compression pad 180 may alleviate thickness deformation of the battery cell 110 due to swelling and variation of the battery cell 110 due to external impact. At least one compression pad 180 may be formed between the adjacent battery cells 110, in addition to the compression pads 180 formed between the outermost battery cells 110 and the side surface portions of the module frame 100.

According to the present embodiment, the first adhesive layer 250 may be formed between adjacent battery cells among the plurality of battery cells 110. The first adhesive layer 250 may be a double-sided adhesive tape. The first adhesive layer 250 may be formed adjacent to the heat conductive resin layer 400. Preferably, the first adhesive layer 250 may be formed at the end of the space portion formed between the adjacent battery cells. Here, the first adhesive layer 250 may be in contact with the heat conductive resin layer 400.

In a modified embodiment, as shown in fig. 8, the upper surface 102 of the module frame 100 may include a protrusion 102P. The protrusion 102P may have a structure protruding from the upper surface 102 of the module frame 100, and may be integrally formed with the upper surface 102 of the module frame 100. The convex portion 102P is formed at a portion corresponding to the above-described guide member 105D, and can prevent the unit block from flowing in the left-right direction and can prevent the unit block from being biased to one side by gravity. Then, the protruding direction of the convex portion 102P and the guide member 105D may be the same, and the protruding direction may be the direction opposite to the gravity direction. The battery cell stack may be a structure in which the bus bar frame 145 of fig. 5 is coupled to the battery cell stack 120.

The battery module according to the present embodiment may further include a second adhesive layer 260 located between the outermost battery cell 110 of the battery cell stack 120 and the compression pad 180. The second adhesive layer 260 may be formed adjacent to the heat conductive resin layer 400. The second adhesive layer 260 may be a double-sided tape. Preferably, the second adhesive layer 260 may be formed at the end of the space portion formed between the adjacent battery cells. Here, the end of the space portion may be close to a position where the liquid injection hole 135 is formed. When viewed from the side of the battery cell 110, as shown in fig. 9, the first adhesive layer 250 may be formed to be biased toward the side of the battery cell 110. Then, the second adhesive layer 260 may be in contact with the heat conductive resin layer 400.

As described above, according to the present embodiment, the attachment positions of the first and second adhesive layers 250 and 260 may be adjusted to prevent the heat conductive resin from penetrating between the adjacent battery cells and/or between the compression pad 180 and the outermost battery cell 110, thereby preventing an increase in cost due to additional injection of the heat conductive resin and reducing the weight of the battery module.

Fig. 10 is a sectional view of a battery module according to another embodiment of the present disclosure.

Referring to fig. 10, the battery module according to the present embodiment may further include a barrier film 270 between the battery cell stack 120 and the heat conductive resin layer 400. The barrier film 270 may be formed of a polymer film, and may be formed of, for example, a polyethylene terephthalate (PET) film. The barrier film 270 according to the present embodiment may cover the first adhesive layer 250 and the second adhesive layer 260. That is, as shown in fig. 10, the barrier film 270 is a structure that extends long in the lateral direction between the battery cell stack 120 and the heat conductive resin layer 400, and may extend to the compression pads 180 located at opposite peripheries of the module frame 100.

When the barrier film 270 is formed, as in the present embodiment, the heat conductive resin may be prevented from penetrating between the adjacent battery cells and/or between the compression pad 180 and the outermost battery cell 110 by the barrier film 270. Therefore, the degree of freedom of the formation positions of the first adhesive layer 250 and the second adhesive layer 260 can be increased. For example, as shown in fig. 10, at least one set of the first and second adhesive layers 250 and 260 may be formed to be slightly spaced apart from the barrier film 270, and unlike this, at least one set of the first and second adhesive layers 250 and 260 may be in contact with the barrier film 270. In addition, at least one of the first adhesive layer 250 and the second adhesive layer 260 may be located at a central portion of the battery cell 110.

In addition to the above differences, all the contents described in the embodiment of fig. 8 can be applied to the present embodiment.

Fig. 11 is a sectional view showing a modified example of the barrier film of fig. 10.

Referring to fig. 11, similar to the embodiment of fig. 10, a barrier film 270 may be located between the battery cell stack 120 and the heat conductive resin layer 400. However, the barrier film 270 according to the present embodiment is not formed to continuously cover the first adhesive layer 250 and the second adhesive layer 260, but includes a plurality of barrier portions, and the barrier portions are separated from each other. In other words, as shown in fig. 11, the blocking part 270 may cover only a space portion between adjacent battery cells and a portion adjacent to the space portion, and similarly, may cover a space portion between the compression part 180 and the outermost battery cell 110 and a portion adjacent to the space portion.

In addition to the above differences, all the contents described in the embodiment of fig. 10 can be applied to the present embodiment.

Meanwhile, one or more battery modules according to embodiments of the present disclosure may be packaged in a battery pack case to form a battery pack.

The above battery module and the battery pack including the same may be applied to various devices. These devices may be applied to vehicles, such as electric bicycles, electric vehicles, hybrid vehicles, but the present disclosure is not limited thereto, but may be applied to various devices that may use a battery module and a battery pack including the battery module, which also falls within the scope of the present disclosure.

Although the preferred embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present disclosure defined in the appended claims also belong to the scope of the claims.

Description of the reference numerals

100: module frame

120: battery cell stack

135: liquid injection hole

250. 260: adhesive layer

270: barrier film

400: and a heat conductive resin layer.