KR20200006822A - Battery pack - Google Patents

Abstract

Provided is a battery pack. The battery pack of the present invention comprises: a battery cell; a cooling plate for cooling the battery cell; a heat transfer sheet interposed on a cooling path between the battery cell and the cooling plate to mediate heat transfer between the battery cell and the cooling plate; and a heating member generating heat in accordance with electrical input, wherein at least a portion thereof is embedded in the heat transfer sheet. According to the present invention, the battery pack enables the heating of the battery cell in a low temperature environment and the cooling of the battery cell in a high temperature environment while structural simplification is possible.

Description

Battery pack {Battery pack}

The present invention relates to a battery pack.

Typically, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that is not rechargeable. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc., and may also be used in the form of a single battery, depending on the type of external equipment applied. It is also used in the form of a pack of batteries connected to one unit.

A small mobile device such as a mobile phone can operate for a predetermined time with the output and capacity of a single battery.However, when a long-time driving and high-power driving such as an electric vehicle or a hybrid vehicle that consume a lot of power are required, The pack type including the battery is preferred, and the output voltage or the output current can be increased according to the number of batteries.

One embodiment of the present invention includes a battery pack capable of simplifying a structure while implementing both heating of a battery cell in a low temperature environment and cooling of the battery cell in a high temperature environment.

In order to solve the above problems and other problems, the battery pack of the present invention,

Battery cells;

A cooling plate for cooling the battery cell;

A heat transfer sheet interposed on the cooling path between the battery cell and the cooling plate to mediate heat transfer between the battery cell and the cooling plate; And

At least a portion of which is embedded in the heat transfer sheet, and a heat transfer member for generating heat according to an electrical input.

For example, the heat transfer sheet may include an upper surface facing the battery cell and a lower surface facing the cooling plate,

The heat transfer member may extend in a plane formed by the heat transfer sheet so as not to deviate from the top and bottom surfaces of the heat transfer sheet.

For example, the heat transfer member may include a heat transfer wire in the form of a metal wire through which current as an electrical input is communicated.

For example, the first and second ends forming both ends of the heating wire may be exposed from the heat transfer sheet for electrical connection with a driving power source.

For example, the heating wire may include first and second heating wires extending in different directions.

For example, the first and second heating wires may be formed of heating wires of different strands.

For example, the first heating wire may include first and second ends exposed from the heat transfer sheet, and a main body portion continuously extending between the first and second ends and embedded in the heat transfer sheet,

The second heating wire may be embedded in the heat transfer sheet.

For example, the first heating wire is extended in the form of a meander reciprocating along the long side direction of the heat transfer sheet,

The second heating wire may extend along a short side portion of the heat transfer sheet.

For example, the heating wire may be formed in a woven form such that the first and second heating wires are woven together.

For example, the first heating wire extends continuously in a meander form reciprocating along the first direction between the first and second ends,

The second heating wire may extend in a curved shape so as to be intertwined with the first heating wire while alternately passing upward and downward of the first heating wire in a second direction crossing the first direction.

For example, the heat transfer sheet includes a top surface facing the battery cell and a bottom surface facing the cooling plate,

The second heating wire may extend in a curved shape so as to alternately have a convex peak portion toward the upper surface of the heat transfer sheet and a convex peak portion toward the lower surface of the heat transfer sheet.

For example, the first heating wire includes a strand of first heating wires continuously extending to reciprocate along the first direction between the first and second ends,

The second heating wire may include a plurality of strands of the second heating wire extending in a second direction crossing the first direction.

For example, the first heating wire extends continuously in a meander form reciprocating along the first direction,

The second heating wire may extend continuously in the form of a meander reciprocating along the second direction crossing the first direction.

For example, the heat transfer sheet,

A first heat transfer sheet filling the first heating wire; And

A second heat transfer sheet filling the second heating wire,

The first and second heat transfer sheets may be laminated on each other.

For example, the first heating wire may include first and second ends exposed from the first heat transfer sheet, and a main body portion continuously extending between the first and second ends and embedded in the first heat transfer sheet,

The second heating wire may include first and second ends exposed from the second heat transfer sheet, and a main body part continuously extending between the first and second ends and embedded in the second heat transfer sheet.

For example, the heat transfer member may include a thermoelectric element that forms a temperature difference between different first and second surfaces according to an electrical input.

For example, the thermoelectric element may include a plurality of thermoelectric elements embedded in the heat transfer sheet and spaced apart from each other.

For example, the first surface of the thermoelectric element faces the battery cell,

The second surface of the thermoelectric element may face the cooling plate.

For example, the first and second surfaces of the thermoelectric element may be embedded in the heat transfer sheet, respectively.

For example, the cooling plate may be formed with a flow path that can accommodate the flow of the cooling medium.

According to the present invention, a heat transfer sheet having a heat transfer member embedded therein while having a heat transfer member capable of heating a low temperature battery cell is disposed on a cooling path of the battery cell, thereby covering the heat transfer member using one heat transfer sheet. A battery pack can be provided that can function as a buffer to reduce contact resistance on the function and cooling path, and can simplify the structure while implementing both heating in a low temperature environment and cooling in a high temperature environment.

1 is an exploded perspective view of a battery pack according to an embodiment of the present invention.
2 is a perspective view of the heat transfer sheet shown in FIG. 1.
3 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 2.
4 shows a side view of the heat transfer sheet of FIG. 2.
5 is an exploded perspective view of a battery pack according to another embodiment of the present invention.
6 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 5.
7 is an exploded perspective view of a battery pack according to another embodiment of the present invention.
8 shows a perspective view of the heat transfer sheet shown in FIG. 7.
9 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 8.
10 shows a side view of the heat transfer sheet of FIG. 8.

Hereinafter, a battery pack according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a battery pack according to an embodiment of the present invention. 2 is a perspective view of the heat transfer sheet shown in FIG. 1. 3 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 2. 4 shows a side view of the heat transfer sheet of FIG. 2.

Referring to the drawings, the battery pack of the present invention may include a battery cell 10, a cooling plate 50 for cooling the battery cell 10, the battery cell 10 and the cooling plate 50 ) May include a heat transfer sheet 100 interposed therebetween.

The heat transfer sheet 100 mediates heat transfer between the battery cell 10 and the cooling plate 50, and is interposed on a cooling path between the battery cell 10 and the cooling plate 50 and thermally transferred therebetween. The contact may be smoothly performed, and the contact resistance may be reduced by increasing the contact area while filling the minute pores by the surface roughness between the battery cell 10 and the cooling plate 50. In one embodiment of the present invention, the heat transfer sheet 100 may be interposed between the plurality of battery cells 10 and the cooling plate 50 to provide an even cooling effect for the plurality of battery cells 10. have.

The heat transfer member H for heating the battery cell 10 may be embedded in the heat transfer sheet 100. The heat transfer member H may generate Joule heat generation according to the electrical input, and by controlling the electric input applied to the heat transfer member H, the heat generation amount may be adjusted. The heat transfer member H may increase the temperature of the battery cell 10 to a temperature higher than or equal to a predetermined temperature by preheating the low temperature battery cell 10 dropped below an appropriate temperature for smooth charging and discharging operation. By rapidly raising the temperature of the battery cell 10, normal charging and discharging operations can be performed quickly.

In an embodiment of the present invention, the heat transfer sheet 100 may be used to reduce contact resistance and improve cooling efficiency on the cooling path between the plurality of battery cells 10 and the cooling plate 50. By embedding the heat transfer member H in the interior 100 and operating the heat transfer member H embedded in the heat transfer sheet 100, for example, the low-temperature battery cell 10 can be quickly moved to an appropriate temperature or higher at an initial stage of operation. By preheating, the charging and discharging operations of the battery cell 10 may be smoothly performed. At this time, the heat transfer sheet 100 is interposed on the heating path between the heat transfer member H and the battery cell 10 as a heat source to increase the contact area between the heat transfer member H and the battery cell 10, The contact resistance may be reduced by bringing the heat transfer member H into close contact with the battery cell 10.

In one embodiment of the present invention, the heat transfer member (H) may include a heating wire 150 in the form of a metal wire through which current as an electrical input is communicated. In this case, in order to uniformly heat the plurality of battery cells 10 in a narrow area, it is preferable to extend the heating area of the heating wire 150 with respect to the plurality of battery cells 10, and to embed the heating wire 150. The heat transfer sheet 100 may extend the heating area of the heating wire 150 with respect to the plurality of battery cells 10.

The heat transfer sheet 100 is interposed on a cooling path between the battery cell 10 and the cooling plate 50 to mediate heat transfer between the battery cell 10 and the cooling plate 50. 100 may be formed in a substantially plate shape having an upper surface 100U facing the battery cell 10 and a lower surface 100L facing the cooling plate 50 as a main surface. Here, the main surface of the heat transfer sheet 100 may mean a surface occupying the widest area among the outer surfaces of the heat transfer sheet 100.

The heat transfer sheet 100 has a top surface 100U facing the battery cell 10 and a bottom surface 100L facing the cooling plate 50 as a main surface, and between the top surface 100U and the bottom surface 100L. It may include a side (100S) for connecting.

At least a portion of the heat transfer member H may be embedded in the heat transfer sheet 100. Here, the fact that at least a part of the heat transfer member H is embedded in the heat transfer sheet 100 means that all of the heat transfer member H is embedded in the heat transfer sheet 100 or a part of the heat transfer member H is It may mean that it is embedded in the heat transfer sheet (100). More specifically, as shown in FIG. 2, when observing the upper surface 100U or the lower surface 100L corresponding to the main surface of the heat transfer sheet 100, all or the heat transfer member H of the heat transfer member H is observed. A portion of the heat transfer sheet 100 may be embedded in the heat transfer sheet 100, and in the structure in which a portion of the heat transfer member H is embedded in the heat transfer sheet 100, the remaining portion of the heat transfer member H may be a heat transfer sheet ( 100). For example, the heat transfer member H may include first and second ends E1 and E2 exposed to the outside of the heat transfer sheet 100 to supply power.

As shown in FIG. 4, when observing the side surface 100S of the heat transfer sheet 100, the heat transfer member H does not deviate from the upper surface 100U and the lower surface 100L of the heat transfer sheet 100. The heat transfer sheet 100 may extend in a plane. For example, the heat transfer member H has a convex peak portion P toward the upper surface 100U of the heat transfer sheet 100 and a convex peak portion P toward the lower surface 100L of the heat transfer sheet 100. However, the peak portion P does not protrude from the upper surface 100U or the lower surface 100L of the heat transfer sheet 100, and is concealed by the upper surface 100U and the lower surface 100L of the heat transfer sheet 100. Can be. As described above, the heat transfer member H is disposed intact in the whole of the thickness t of the heat transfer sheet 100 or in the projection area of the thickness t of the heat transfer sheet 100, and the heat transfer sheet 100. It may not be out of the thickness (t) of.

The heating member H shown in FIG. 2 may include a heating wire 150 in the form of a wire through which current as an electrical input is communicated. The heating wire 150 generates Joule heating according to the electrical input, and the heating wire 150 through which current as the electrical input is communicated needs to be coated for electrical insulation with the surrounding configuration. In this case, the heat transfer sheet 100 may function to cover the heating wire 150 and to electrically insulate the heating wire 150 from the peripheral configuration. That is, the heating wire 150 is embedded in the heat transfer sheet 100, and a separate coating layer surrounding the outer surface of the metal wire as the heating wire 150 may be omitted. As such, by using the heat transfer sheet 100 to bury the heating wire 150, a separate configuration for covering the heating wire 150 may be omitted, and the heat transfer sheet 100 may cover the heating wire 150. In addition, interposed on the cooling path between the battery cell 10 and the cooling plate 50 to increase the contact area between the battery cell 10 and the cooling plate 50 and to increase the contact area between the battery cell 10 and the cooling plate 50. The contact resistance can be reduced by close contact therebetween, and can serve as a function of filling the air layer according to the surface roughness of the contact surface between the battery cell 10 and the cooling plate 50 and reducing the contact resistance on the heat transfer path.

The heating wire 150 may be embedded in the heat transfer sheet 100, and the first and second ends E1 and E2 forming both ends E1 and E2 of the heating wire 150 may include a heat transfer sheet ( Exposed from 100 may be connected to a driving power source (not shown). The driving power source (not shown) may be connected to the first and second ends E1 and E2 of the heating wire 150 to generate Joule heat generation by supplying controlled driving power to the heating wire 150. More specifically, the heating wire 150 is a first portion exposed from the heat transfer sheet 100 for the electrical connection between the main body portion (B) embedded in the heat transfer sheet 100 and a driving power source (not shown). It may include a second end (E1, E2).

As will be described later, the heating wire 150 may include first and second heating wires 151 and 152 extending in different directions Z1 and Z2, and the heating wire 150 may extend in different directions Z1 and Z2. Among the first and second heating wires 151 and 152, the first heating wire 151 is a heat transfer sheet for electrical connection with the main body portion B embedded in the heat transfer sheet 100 and a driving power source (not shown). It may include the first and second end (E1, E2) exposed from the (100). In one embodiment of the present invention, the second heating wire 152 may be embedded in the inside of the heat transfer sheet 100 as a whole, for example, does not include a portion exposed from the heat transfer sheet 100. You may not.

In one embodiment of the present invention, the second heating wire 152 may be electrically connected to the first heating wire 151 to receive driving power. For example, the first heating wire 151 in which driving power (not shown) is not directly connected to the second heating wire 152, and driving power (not shown) is connected to the first and second ends E1 and E2. Drive power may be supplied through the electronic device, and an electrical contact (not shown) may be formed between the first and second heating wires 151 and 152. In an exemplary embodiment of the present invention, a contact point (not shown) of the first and second heating wires 151 and 152 may be formed at a position adjacent to the first and second ends E1 and E2. The two heating wires 151 and 152 may be connected in parallel between the first and second end portions E1 and E2 and both contacts (not shown) adjacent to each other.

The heating wire 150 may extend in two different directions Z1 and Z2 in the heat transfer sheet 100. More specifically, the heating wire 150 may include first and second heating wires 151 and 152 extending along different directions Z1 and Z2. The heating wire 150 includes the first and second heating wires 151 and 152 extending in different directions Z1 and Z2, so that the heating wire 150 may be heated evenly along the surface direction of the heat transfer sheet 100. Through the first and second heating wires 151 and 152 extending in two directions Z1 and Z2, thermal characteristics of the heat transfer sheet 100 may be maintained uniformly along the plane direction of the heat transfer sheet 100, and the heat transfer sheet may be Through the 100, the heat transfer between the plurality of battery cells 10 and the cooling plate 50 may be evenly performed.

The heating wire 150 may be formed in the form of a metal wire for Joule heat generation, the heat transfer characteristics between the battery cell 10 and the cooling plate 50 is due to the characteristics of the metal material having excellent thermal conductivity characteristics of the heating wire 150 Anisotropy can be seen along the extending directions Z1 and Z2. The first and second heating wires 151 and 152 extend in two different directions Z1 and Z2, and this anisotropy can be alleviated to some extent, and the heat transfer sheet ( Along the surface direction (Z1, Z2) of 100 may exhibit a substantially uniform heat transfer characteristics.

The heat transfer sheet 100 may mediate heat transfer along the thickness t direction of the heat transfer sheet 100 between the battery cell 10 and the cooling plate 50, and may be located at a position of the heat transfer sheet 100. Accordingly, different thermal resistances may be exhibited at the positions of the heating wire 150 and the positions between the heating wires 150 adjacent to each other (the position at which the heating wire 150 is excluded). In this case, since the first and second heating wires 151 and 152 extend along two different directions Z1 and Z2, differential thermal resistance may be equalized to some extent according to the position of the heat transfer sheet 100, and a plurality of batteries may be used. It is possible to provide uniform heat dissipation performance for the cell 10.

The heating wire 150 may provide excellent tensile strength along the extending directions Z1 and Z2 of the heating wire 150 and may reinforce the tensile strength of the heat transfer sheet 100. For example, the heat transfer sheet 100 may effectively resist tensile force through the heating wire 150 embedded in the heat transfer sheet 100, and may provide sufficient tensile strength. At this time, since the first and second heating wires 151 and 152 extend along two different directions Z1 and Z2, the first and second heating wires 151 and 152 extend in two different directions Z1 and Z2 even in a tensile force in any direction acting on the heat transfer sheet 100. The extending first and second heating wires 151 and 152 may effectively resist each component of the tensile force decomposed in each of the extending directions Z1 and Z2, and by bearing the tensile force through the heating wire 150, the heat transfer sheet ( 100) damage can be prevented.

The first and second heating wires 151 and 152 may extend along different first and second directions Z1 and Z2. In one embodiment of the present invention, the first heating wire 151 may extend along a first direction Z1, for example, a long side direction (first direction, Z1) of the heat transfer sheet 100. The second heating wire 152 may extend along a second direction Z2, for example, a direction of a short side portion of the heat transfer sheet 100 (second direction, Z2).

When the first and second heating wires 151 and 152 extend in two different directions Z1 and Z2, all parts of the first heating wire 151 extend along the first direction Z1 and the second heating wire ( This does not mean that all parts of the 152 extend along the second direction Z2 different from the first direction Z1. For example, the first heating wire 151 extends in a meander shape reciprocating along the long side direction (first direction, Z1) of the heat transfer sheet 100, and the long side of the heat transfer sheet 100. The first heating wire 151 is bypassed in a U shape at both ends of the heat transfer sheet 100 in the long side direction (first direction, Z1) to reciprocate in a zig-zag pattern along the negative direction (first direction, Z1). And the extension direction Z1 can be reversed. Therefore, although not all parts of the first heating wire 151 extend along the long side direction (first direction, Z1), the main direction of the first heating wire 151 may be a long side direction (first direction, Since it corresponds to Z1), the first heating wire 150 may extend along a long side direction (first direction, Z1).

The heating wire 150 may be formed in a woven form such that the first and second heating wires 151 and 152 are woven together. For example, the first heating wire 151 extends in the form of a meander reciprocating along the long side direction (first direction, Z1) of the heat transfer sheet 100, and together with the second heating wire. The first and second heating wires 151 and 152 extending in different directions Z1 and Z2 are woven with respect to each other while extending along the short side direction (second direction, Z2) of the heat transfer sheet 100. It may be formed in the form woven to be.

As the first and second heating wires 151 and 152 extend along two different directions Z1 and Z2, as shown in FIG. 2, the upper surface 100U corresponding to the main surface of the heat transfer sheet 100 or When the lower surface 100L is observed, it may mean that the first and second heating wires 151 and 152 extend in two different directions Z1 and Z2. As shown in FIG. 4, when observing the side surface 100S of the heat transfer sheet 100, at least one of the heat transfer lines 151 and 152 of the first and second heat transfer lines 151 and 152 may be formed of the heat transfer sheet 100. It may extend in a curved shape along the thickness (t) direction, the peak portion convex toward the upper surface (100U) between the upper surface (100U) and the lower surface (100L) in the thickness (t) direction of the heat transfer sheet 100 ( It may be formed in a curved wave shape to alternately have a convex peak portion (P) toward the P) and the lower surface 100L, while being formed in a curved wave shape along the thickness (t) direction of the heat transfer sheet 100, The first and second heating wires 151 and 152 extending in different directions Z1 and Z2 may be formed in a woven form to be interwoven with each other.

For example, the second heating wire 152 extending in the second direction Z2 may be bent and extended to alternately pass upward and downward of the first heating wire 151 extending along the first direction Z1. The first and second heating wires 151 and 152 extending in different first and second directions Z1 and Z2 may be formed in a woven form to be interwoven with each other.

The first and second heating wires 151 and 152 extending along two different directions Z1 and Z2 are formed to be bent to each other along the thickness t direction of the heat transfer sheet 100, and thus the heating wire 150 ) May be formed in a whole woven form. As such, the woven heating wire 150 may form physical interference with each other along the thickness t direction of the heat transfer sheet 100, and may be, for example, in different directions Z1 and Z2. The extending first and second heating wires 151 and 152 may form a physical interference while weaving with respect to each other, and effectively resist the tensile force applied along the plane direction of the heat transfer sheet 100 so that the heat transfer sheet 100 may Tensile strength can be raised further.

In the present invention, the first and second heating wires 151 and 152 may be formed in a woven form to be interwoven with each other, or the first and second heating wires 151 and 152 may form physical interference. This does not mean that the heating wires 151 and 152 are in direct contact with each other. For example, even though the first and second heating wires 151 and 152 do not form direct contact with each other, the first and second heating wires 151 and 152 extend in different directions Z1 and Z2 and the heat transfer sheet 100 is provided. It may extend in a woven form while crossing each other through a portion of the).

The first heating wire 151 may extend continuously in the form of a meander reciprocating along the first direction Z1 between the first and second ends E1 and E2, and the second heating wire The curved portion 152 may be curved to be intertwined with the first heating wire 151 while alternately passing up and down the first heating wire 151 along the second direction Z2 crossing the first direction Z1. May be extended to. At this time, the second heating wire 152 has a convex peak portion P toward the upper surface 100U of the heat transfer sheet 100 and a convex peak portion P toward the lower surface 100L of the heat transfer sheet 100. The second heating wire 152 may be alternately extended to have a curved shape, and the second heating wire 152 may have a convex peak portion P toward the upper surface 100U of the heat transfer sheet 100 facing the battery cell 10, and may be cooled. A first wave extending in parallel in the first direction Z1 while being formed in a curved wave shape having alternately convex peak portions P toward the lower surface 100L of the heat transfer sheet 100 facing the plate 50. The first and second heating wires 151 and 152 are bent and extended so as to alternately pass upward and downward of the heating wire 151, and extend in different first and second directions Z1 and Z2. It may be formed in the form.

The first and second heating wires 151 and 152 may be formed of heating wires 150 of different strands. Here, that the first and second heating wires 151 and 152 are formed of the heating wires 150 of different strands, is not formed from a single heating wire 150 is connected to the first, second heating wires 151, 152 continuously. This may mean that the heating wires 150 are formed of different strands. The first heating wire 151 is a strand of heating wire 150 continuously extending in the form of a meander reciprocating along the first direction Z1 between the first and second ends E1 and E2. It can be formed as. More specifically, the first heating wire 151 extends continuously between the first and second ends E1 and E2 exposed from the heat transfer sheet 100 and the first and second ends E1 and E2. And it may be formed as a whole of the heating wire 150 including the body portion (B) embedded in the heat transfer sheet 100 as a whole. Unlike the first heating wire 151, the second heating wire 152 alternately passes upward and downward of the first heating wire 151 along the second direction Z2 crossing the first direction Z1. It may be formed of a plurality of strands of heating wire 150 extending in a curved form to be interwoven with the first heating wire 151.

Referring to FIG. 1, the cooling plate 50 may have a flow path 50a capable of receiving a flow of a cooling medium, and the heat transferred from the battery cell 10 via the heat transfer sheet 100 may be It may be discharged to the outside through the flow of the cooling medium. The cooling medium may be circulated along a closed loop path including the flow path 50a of the cooling plate 50 or may flow along an open loop path including the flow path 50a of the cooling plate 50, and may be cooled. On a path through which the medium circulates along the closed loop, a cooling unit (not shown) for cooling the cooling medium may be provided. On the other hand, the cooling plate 50 may be connected to the flow path (50a) of the cooling medium may be formed an outlet inlet (not shown) for allowing the inlet and outlet of the cooling medium. In FIG. 1, reference numeral 15, which is not described in FIG. 1, is an electrode terminal 15 of the battery cell 10, and the electrode terminal 15 of the battery cell 10 may be formed on an upper surface opposite to the heat transfer sheet 100. .

5 is an exploded perspective view of a battery pack according to another embodiment of the present invention. FIG. 6 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 5.

Referring to the drawings, the battery pack of the present invention may include a battery cell 10, a cooling plate 50 for cooling the battery cell 10, the battery cell 10 and the cooling plate 50 ) May include a heat transfer sheet 200 interposed therebetween.

The heat transfer member H for heating the battery cell 10 may be embedded in the heat transfer sheet 200. The heat transfer member H may generate Joule heat generation according to the electrical input, and by controlling the electric input applied to the heat transfer member H, the heat generation amount may be adjusted.

In one embodiment of the present invention, the heating member (H) may include a heating wire 250 in the form of a metal wire through which current as an electrical input is communicated. The heating wire 250 may extend along two different directions Z1 and Z2 in the heat transfer sheet 200, and may extend along first and second directions Z1 and Z2. It may include two heating wires (251, 252). Since the heating wire 250 includes the first and second heating wires 251 and 252 extending in different first and second directions Z1 and Z2, the heating wire 250 may be uniformly heated along the surface direction of the heat transfer sheet 200. The thermal characteristics of the heat transfer sheet 200 may be uniformly maintained along the surface direction of the heat transfer sheet 200 through the first and second heat transfer lines 251 and 252 extending in two different directions Z1 and Z2. In addition, heat transfer between the plurality of battery cells 10 and the cooling plate 50 may be equally performed through the heat transfer sheet 200.

The heating wire 250 may provide excellent tensile strength along the extending directions Z1 and Z2 of the heating wire 250 and may reinforce the tensile strength of the heat transfer sheet 200. In this case, the first and second heating wires 251 and 252 extend along two different directions Z1 and Z2, so that the first and second heating wires 251 and 252 extend in two different directions Z1 and Z2, even in a tensile force in any direction acting on the heat transfer sheet 200. The extending first and second heating wires 251 and 252 may effectively resist each component of the tensile force decomposed in each of the extending directions Z1 and Z2, and by bearing the tensile force through the heating wire 250, the heat transfer sheet ( Damage to 200 can be prevented.

The heating wire 250 generates Joule heating according to the electrical input, the heating wire 250 through which current as the electrical input is communicated, it is necessary to be covered for electrical insulation with the peripheral configuration. In this case, the heat transfer sheet 200 may function to cover the heating wire 250 and to electrically insulate the heating wire 250 from the peripheral configuration. That is, since the heating wire 250 is embedded in the heat transfer sheet 200, a separate coating layer surrounding the outer surface of the metal wire as the heating wire 250 may be omitted. As such, by using the heat transfer sheet 200 to bury the heating wire 250, a separate configuration for covering the heating wire 250 may be omitted, and the heat transfer sheet 200 may cover the heating wire 250. In addition, interposed on the cooling path between the battery cell 10 and the cooling plate 50 to increase the contact area between the battery cell 10 and the cooling plate 50 and to increase the contact area between the battery cell 10 and the cooling plate 50. The contact resistance can be reduced by close contact therebetween, and can serve as a function of filling the air layer according to the surface roughness of the contact surface between the battery cell 10 and the cooling plate 50 and reducing the contact resistance on the heat transfer path.

The heat transfer sheet 200 may include a first heat transfer sheet 201 for filling the first heating wire 251 and a second heat transfer sheet 202 for embedding the second heating wire 252, respectively. That is, the first and second heating wires 251 and 252 are formed at different depths along the thickness (t, FIG. 6) direction of the entire heat transfer sheet 200 including the first and second heat transfer sheets 201 and 202. And a portion of the heat transfer sheet 200 to bury the first heating wire 251 may form the first heat transfer sheet 201 and a portion of the heat transfer sheet 200 to bury the second heating wire 252. May form the second heat transfer sheet 202. The first heat transfer sheet 201 that fills the first heating wire 251 may function to cover and insulate the first heat transfer wire 251, and the second heat transfer sheet that fills the second heating wire 252. 202 may function to cover and insulate the second heating wire 252.

The first and second heat transfer sheets 201 and 202 may be separately formed to fill the first and second heat transfer lines 251 and 252, respectively, and then may be combined to be stacked on each other to form a single heat transfer sheet 200. . In another embodiment of the present invention, the first and second heat transfer sheets 201 and 202 are one integral heat transfer formed to fill the first and second heating wires 251 and 252 at different depths along the thickness t direction. It may be formed of the sheet 200. In this case, the first and second heat transfer sheets 201 and 202 may be formed of the same material.

At least a portion of the heating wire 250 may be embedded in the heat transfer sheet 200. Here, at least a portion of the heating wire 250 is embedded in the heat transfer sheet 200, the entire heating wire 250 is embedded in the heat transfer sheet 200 or a portion of the heating wire 250 is a heat transfer sheet ( 200 may be embedded in the interior.

More specifically, the heating wire 250 may include first and second heating wires 251 and 252 extending along different first and second directions Z1 and Z2, and the first heating wire 251 may include First and second ends exposed to the outside from the first heat transfer sheet 201 for connection with a main body portion B1 embedded in the first heat transfer sheet 201 and a driving power source (not shown). (E11, E12). In this case, the first heating wire 251 may extend continuously in the form of a meander reciprocating along the first direction Z1 between the first and second ends E11 and E12.

Similarly, the second heating wire 252 is external from the second heat transfer sheet 202 to be connected to the main body portion B2 embedded in the second heat transfer sheet 202 and a driving power source (not shown). The first and second ends E21 and E22 may be exposed. In this case, the second heating wire 252 may extend continuously in the form of a meander reciprocating along the second direction Z2 between the first and second ends E21 and E22.

First and second end portions E11, E12, E21, and E22 forming both ends of the first and second heating wires 251 and 252 may be connected to a driving power source (not shown), and the driving power source (not shown). May be connected to the first and second ends E11, E12, E21, and E22 of the heating wire 250 to supply Joule heating to the first and second heating wires 251 and 252. In an embodiment of the present invention, the first and second heating wires 251 and 252 may be formed of heating wires 250 of different strands and are electrically connected to the first and second heating wires 251 and 252 of different strands. Each of the controlled drive powers as an input can be applied separately. In this case, the same driving power (not shown) may be connected to the first and second heating wires 251 and 252 to apply the same driving power.

As described above, part of the first and second heating wires 251 and 252 is embedded in the first and second heat transfer sheets 201 and 202, and the remaining part of the first and second heating wires 251 and 252 is first and second. 2 may be exposed from heat transfer sheets 201 and 202. Here, a part of the first and second heating wires 251 and 252 is embedded in the first and second heat transfer sheets 201 and 202, and the remaining part is exposed from the first and second heat transfer sheets 201 and 202. Main surface of the entire heat transfer sheet 200 including the first and second heat transfer sheets 201 and 202, that is, the top surface 200U (see FIG. 6) or the cooling plate of the heat transfer sheet 200 facing the battery cell 10. When the lower surface (200L, see FIG. 6) of the heat transfer sheet 200 facing 50 is observed, a part of the first and second heat transfer lines 251 and 252 is embedded in the heat transfer sheet 200, and the other part is heat transfer. It may mean that it is exposed from the sheet 200. On the other hand, when observing the side surface 200S (refer FIG. 6) of the heat transfer sheet 200, the 1st, 2nd heating wire 251, 252 is the upper surface (200U, FIG. 6) or lower surface (200L) of the heat transfer sheet 200. 6, and are intactly disposed within the thickness t of the heat transfer sheet 200 (see FIG. 6) or within the projection area of the thickness t of the heat transfer sheet 200, and the heat transfer sheet 200. It may not be out of the thickness (t) of.

The first and second heating wires 251 and 252 may extend along different first and second directions Z1 and Z2. In one embodiment of the present invention, the first heating wire 251 may extend along a first direction Z1, for example, a long side direction (first direction, Z1) of the heat transfer sheet 200. The second heating wire 252 may extend in a second direction Z2, for example, a direction of a short side portion (second direction, Z2) of the heat transfer sheet 200.

When the first and second heating wires 251 and 252 extend in two different directions Z1 and Z2, all parts of the first heating wire 251 extend along the first direction Z1 and the second heating wire ( This does not mean that all portions of the 252 extend along the second direction Z2 different from the first direction Z1. For example, the first heating wire 251 extends in a meander shape reciprocating along the long side direction (first direction, Z1) of the heat transfer sheet 200, and the long side of the heat transfer sheet 200. The first heating wire 251 is diverted in a U shape at both ends of the heat transfer sheet 200 in the long side direction (first direction, Z1) so as to reciprocate in a zig-zag pattern along the negative direction (first direction, Z1). And the extension direction Z1 can be reversed. Thus, although not all parts of the first heating wire 251 extend along the long side direction (first direction, Z1), the main direction of the first heating wire 251 is a long side direction (first direction, Since it corresponds to Z1), the first heating wire 251 may extend along the long side direction (first direction, Z1).

Similarly, the second heating wire 252 extends in a meander form reciprocating along the short side direction (second direction, Z2) of the heat transfer sheet 200, and the short side portion of the heat transfer sheet 200. In order to reciprocate in a zig-zag pattern along a direction (second direction, Z2), the second heating wire 252 is diverted in a U shape at both ends of the heat transfer sheet 200 in a short side direction (second direction, Z2). The extending direction Z2 can be reversed. Thus, although all parts of the second heating wire 252 may not be extended along the short side direction (second direction, Z2), the main direction of the second heating wire 252 is the short side direction (second direction Z2). In this case, the second heating wire 252 may extend along the short side direction (second direction, Z2). Referring to FIG. 5, the cooling plate 50 may have a flow path 50a capable of receiving a flow of a cooling medium, and the heat transferred from the battery cell 10 via the heat transfer sheet 200 may be It may be discharged to the outside through the flow of the cooling medium.

7 is an exploded perspective view of a battery pack according to another embodiment of the present invention. 8 shows a perspective view of the heat transfer sheet shown in FIG. 7. 9 is a perspective view of the heat transfer sheet and the heat transfer member embedded in the heat transfer sheet of FIG. 8. 10 shows a side view of the heat transfer sheet of FIG. 8.

Referring to the drawings, the battery pack, the battery cell 10, the cooling plate 50 for cooling the battery cell 10, and the cooling path between the battery cell 10 and the cooling plate 50 on the cooling path A heat transfer sheet 300 interposed in the heat transfer sheet 300 for mediating heat transfer between the battery cell 10 and the cooling plate 50, and embedded in the heat transfer sheet 300 to generate heat according to an electrical input. It may include a heat transfer member (H) for raising.

The heat transfer member H illustrated in FIG. 8 may include a thermoelectric element 350 that forms a temperature difference between the first and second surfaces 352 different from each other according to an electrical input. For example, the thermoelectric element 350 may include a first surface 351 and a second surface 352, in which thermal effects that are opposite to each other may be present, and the first and second surfaces of the thermoelectric element 350 may be formed. One surface of the surfaces 351 and 352 may form a high temperature surface having a relatively high temperature, and the other surface of the first and second surfaces 351 and 352 of the thermoelectric element 350 may have a relatively low temperature. Low temperature side can be formed.

The thermoelectric element 350 generates heat or heat through one of the first and second surfaces 351 and 352 according to an electrical input, and absorbs heat through the other one of the first and second surfaces 351 and 352. Alternatively, cooling may be performed, and a plurality of battery cells 10 may be heated or cooled through the first and second surfaces 351 and 352 of the thermoelectric element 350.

In one embodiment of the present invention, by embedding the thermoelectric element 350 in the heat transfer sheet 300 and operating the thermoelectric element 350 embedded in the heat transfer sheet 300, for example, the low temperature at the initial By preheating the battery cell 10 quickly above a suitable temperature, the charging and discharging operations of the battery cell 10 may be smoothly performed. In addition, the thermoelectric element 350 may reverse the thermal effect of the first and second surfaces 351 and 352 by reversing the polarity of the electrical input, and according to the charging and discharging operation of the battery cell 10, the battery may be reversed. In a high temperature environment in which the cell 10 is heated, the plurality of battery cells 10 may be cooled by operating the thermoelectric element 350 for smooth operation of the battery cell 10.

The thermoelectric element 350 may include first and second surfaces 351 and 352 that are opposite to each other and exhibit different thermal effects. The thermoelectric element 350 may have a substantially plate shape having the first and second surfaces 351 and 352 as main surfaces. It can be formed as. The first surface 351 of the thermoelectric element 350 may face the battery cell 10, the second surface 352 of the thermoelectric element 350 may face the cooling plate 50, and the thermoelectric element ( The battery cell 10 may be heated or cooled through the first surface 351 of the 350 and absorbs heat supplied to the battery cell 10 through the second surface 352 of the thermoelectric element 350. Alternatively, heat from the battery cell 10 may be discharged.

The thermoelectric element 350 may be embedded in the heat transfer sheet 300, and increase the contact area between the battery cell 10 and the thermoelectric element 350 through the heat transfer sheet 300, and the battery cell 10. ) Between the thermoelectric element 350 and the thermoelectric element 350 to reduce the contact resistance, for example, filling the air layer according to the surface roughness of the contact surface between the battery cell 10 and the thermoelectric element 350 and reducing the contact resistance on the heat transfer path. Can play a role.

The thermoelectric element 350 may be entirely embedded in the heat transfer sheet 300, and a power supply line (not shown) for supplying driving power as an electrical input to the thermoelectric element 350 may include a heat transfer sheet ( Exposed to the outside of the 300 may be connected to the driving power (not shown).

As illustrated in FIG. 10, the first and second surfaces 351 and 352 of the thermoelectric element 350 may be completely embedded in the thickness t of the heat transfer sheet 300, respectively. ) May not be exposed to the upper surface 300U or the lower surface 300L. More specifically, the first surface 351 of the thermoelectric element 350 faces the upper surface 300U of the heat transfer sheet 300, is concealed by the upper surface 300U of the heat transfer sheet 300, and the upper surface 300U. ), The second surface 352 of the thermoelectric element 350 faces the lower surface 300L of the heat transfer sheet 300, and is concealed by the lower surface 300L of the heat transfer sheet 300. May not be exposed from 300L. As such, the first and second surfaces 351 and 352 of the thermoelectric element 350 are concealed and not exposed by the upper surface 300U and the lower surface 300L of the heat transfer sheet 300, as shown in FIG. 7. The heat transfer sheet 300 is interposed between the first surface 351 of the thermoelectric element 350 and the battery cell 10, and between the second surface 352 of the thermoelectric element 350 and the cooling plate 50. Thus, the contact resistance between them can be reduced.

The upper surface 300U and the lower surface 300L of the heat transfer sheet 300 may form a main surface of the heat transfer sheet 300 facing the battery cell 10 and the cooling plate 50, respectively. The first and second surfaces 351 and 352 of the 350 may be buried. The heat transfer sheet 300 has an upper surface 300U and a lower surface 300L as a main surface, and has a substantially flat side surface including a relatively narrow side surface 300S connecting the upper surface 300U and the lower surface 300L. Can be formed.

The heat transfer sheet 300 filling the thermoelectric element 350 may extend the first surface 351 of the relatively narrow thermoelectric element 350 with respect to the plurality of battery cells 10. It is possible to provide a uniform heating or cooling effect for the battery cell 10. In one embodiment of the present invention, the thermoelectric element 350 may include a plurality of thermoelectric elements 350 to provide a uniform heating or cooling effect for the plurality of battery cells 10. More specifically, the thermoelectric element 350 may include a plurality of thermoelectric elements 350 spaced apart from each other, and the plurality of thermoelectric elements 350 do not overlap each other in the heat transfer sheet 300. May be embedded in the heat transfer sheet 300 to provide a uniform heating or cooling effect along the plane of the heat transfer sheet 300. For example, the plurality of thermoelectric elements 350 may be arranged to be spaced apart from each other along the long side direction (first direction Z1) of the heat transfer sheet 300.

For example, in a low temperature environment that is lower than an appropriate temperature for smooth operation of the battery cell 10, such as the initial operation, the first surface of the thermoelectric element 350 according to the first control signal supplied to the thermoelectric element 350. 351 may be a high temperature side, and the second side 352 of the thermoelectric element 350 may be operated as a low temperature side, and thus, a plurality of battery cells through the first side 351 of the thermoelectric element 350. At the same time as supplying heat to (10), it is possible to absorb heat from the cooling plate 50 through the second surface 352 of the thermoelectric element (350).

For example, in a high temperature environment that is higher than an appropriate temperature for smooth operation of the battery cell 10, such as during charging and discharging operation of the battery cell 10, the second control is supplied to the thermoelectric element 350. In response to the signal, the first surface 351 of the thermoelectric element 350 may operate as the low temperature surface, and the second surface 352 of the thermoelectric element 350 may operate as the high temperature surface. While absorbing heat from the plurality of battery cells 10 through the first surface 351, heat may be discharged toward the cooling plate 50 through the second surface 352 of the thermoelectric element 350. .

As described above, according to the temperature of the battery cell 10, the first surface 351 of the thermoelectric element 350 facing the battery cell 10 may be operated as a high temperature surface or a low temperature surface, and the thermoelectric element 350 may be operated. The second surface 352 opposite to the first surface 351 may be operated as a low temperature surface or a high temperature surface as opposed to the first surface 351. In addition, the cooling plate 50 facing the second surface 352 of the thermoelectric element 350 may absorb heat to be supplied to the battery cell 10 or discharge heat transferred from the battery cell 10. In this regard, in the present embodiment, the cooling plate 50 may not only discharge heat of the battery cell 10 in a high temperature environment but also supply heat to the battery cell 10 in a low temperature environment.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible for those skilled in the art to which the present invention pertains. You will understand the point. Therefore, the true scope of protection of the present invention should be defined by the appended claims.

10: battery cell 50: cooling plate
H: heat transfer member 100,200,300: heat transfer sheet
201: first heat transfer sheet 202: second heat transfer sheet
100U, 200U, 300U: Top 100L, 200L, 300L: Bottom
100S, 200S, 300S: Side 150,250: Heating cable
151,251: first heating wire 152,252: second heating wire
E1, E11, E21: first end E2, E12, E22: second end
350: thermoelectric element 351: first surface
352: second page

Claims (20)

Battery cells;
A cooling plate for cooling the battery cell;
A heat transfer sheet interposed on the cooling path between the battery cell and the cooling plate to mediate heat transfer between the battery cell and the cooling plate; And
At least a portion of which is embedded in the heat transfer sheet, wherein the heat transfer member is configured to generate heat according to an electrical input. The method of claim 1,
The heat transfer sheet includes an upper surface facing the battery cell and a lower surface facing the cooling plate,
The heat transfer member, the battery pack, characterized in that extending in the plane formed by the heat transfer sheet so as not to deviate from the top and bottom surfaces of the heat transfer sheet. The method of claim 1,
The heat transfer member, the battery pack, characterized in that it comprises a heating wire in the form of a metal wire through which current as an electrical input communicates. The method of claim 3,
First and second ends forming both ends of the heating wire, the battery pack, characterized in that exposed from the heat transfer sheet for electrical connection with a driving power source. The method of claim 3,
The heating wire is a battery pack, characterized in that it comprises a first, second heating wire extending in different directions. The method of claim 5,
The first and second heating wires, the battery pack, characterized in that formed by heating wires of different strands. The method of claim 5,
The first heating wire includes first and second ends exposed from the heat transfer sheet, and a main body portion continuously extending between the first and second ends and embedded in the heat transfer sheet.
The second heating wire is a battery pack, characterized in that embedded in the heat transfer sheet. The method of claim 5,
The first heating wire is extended in the form of a meander reciprocating along the long side direction of the heat transfer sheet,
The second heating wire is a battery pack, characterized in that extending along the direction of the short side portion of the heat transfer sheet. The method of claim 5,
The heating wire is a battery pack, characterized in that the first and second heating wire is formed in a form woven so as to weave each other. The method of claim 9,
The first heating wire is continuously extended in the form of a meander reciprocating along the first direction between the first and second ends,
The second heating wire is a battery pack, characterized in that extending in a curved form to be intertwined with the first heating wire while alternately passing up and down the first heating wire in a second direction crossing the first direction. The method of claim 10,
The heat transfer sheet includes a top surface facing the battery cell and a bottom surface facing the cooling plate,
And the second heating wire extends in a curved shape so as to alternately have a convex peak portion toward the upper surface of the heat transfer sheet and a convex peak portion toward the lower surface of the heat transfer sheet. The method of claim 9,
The first heating wire includes a strand of first heating wires continuously extending to reciprocate along the first direction between the first and second ends,
The second heating wire, the battery pack, characterized in that it comprises a plurality of strands of the second heating wire extending in a second direction crossing the first direction. The method of claim 5,
The first heating wire is continuously extended in the form of a meander reciprocating along the first direction,
The second heating wire is a battery pack, characterized in that continuously extending in the form of a meander reciprocating along the second direction crossing the first direction. The method of claim 13,
The heat transfer sheet,
A first heat transfer sheet filling the first heating wire; And
A second heat transfer sheet filling the second heating wire,
And the first and second heat transfer sheets are stacked on each other. The method of claim 14,
The first heating wire includes a first and a second end exposed from the first heat transfer sheet, a main body portion continuously extending between the first and second ends and embedded in the first heat transfer sheet,
The second heating wire includes a first and a second end exposed from the second heat transfer sheet, and a body portion continuously extending between the first and second ends and embedded in the second heat transfer sheet. pack. The method of claim 1,
The heat transfer member, the battery pack, characterized in that it comprises a thermoelectric element for forming a temperature difference between different first and second surfaces in accordance with the electrical input. The method of claim 16,
The thermoelectric element includes a plurality of thermoelectric elements embedded in the heat transfer sheet and spaced apart from each other. The method of claim 16,
The first surface of the thermoelectric element faces the battery cell,
The second surface of the thermoelectric element, the battery pack, characterized in that facing the cooling plate. The method of claim 18,
The first and second surfaces of the thermoelectric element are embedded in the heat transfer sheet, respectively. The method of claim 1,
The cooling plate is characterized in that the cooling plate is formed with a flow path for receiving the flow of the cooling medium.

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