KR20210019891A - Bettery module - Google Patents

Abstract

According to an embodiment of the present invention, provided is a battery module which comprises: a battery cell stacked body in which a plurality of battery cells are stacked; a cooling plate which is disposed on the outside of the battery cell stacked body to release heat generated in the battery cells to the outside; and a bus bar in which electrode leads provided in the battery cells are bonded. The bus bar may have at least one hollow which is disposed side by side with the electrode leads.

Description

Battery module {BETTERY MODULE}

The present invention relates to a battery module.

Unlike primary batteries, secondary batteries can be charged and discharged, and thus can be applied to various fields such as digital cameras, mobile phones, notebook computers, and hybrid vehicles. Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries.

Among these secondary batteries, a number of studies on lithium secondary batteries with high energy density and discharge voltage are in progress, and recently, lithium secondary batteries are manufactured as pouch-type battery cells with flexibility and are connected to a number of modules in the form of a module. It is composed of and used.

On the other hand, when the battery module is used for a long time, heat is generated from the battery, and the internal temperature rises sharply, especially when charging, and such an increase in the temperature of the battery shortens the life of the battery and lowers the efficiency of the battery. In addition, in the worst case, ignition or explosion can occur.

In particular, heat is concentrated in the electrode leads of the battery cells or the bus-bars electrically connecting them in accordance with the demand for rapid charging and high power, and thus, a cooling method is required.

An object of the present invention is to provide a battery module capable of effectively dissipating heat generated from electrode leads and bus bars of a battery cell.

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 cooling plate disposed outside the battery cell stack to discharge heat generated from the battery cells to the outside, and the battery A bus bar to which electrode leads provided in cells are bonded may be included, and the bus bar may include at least one hollow disposed in parallel with the electrode leads.

In this embodiment, a fluid that is filled in the hollow and causes a phase change by heat may be further included.

In this embodiment, the fluid may include any one of water, ammonia, acetone, methanol, and ethanol.

In the present embodiment, the bus bar may include a plurality of through holes into which the electrode leads are inserted, and the hollows may be disposed between the through holes.

In the present exemplary embodiment, the busbar may have a thickness greater in a second area in which the hollow is disposed than in a first area in which the plurality of through holes are disposed.

In this embodiment, the thickness of the second region may be equal to the sum of the thickness of the first region and the thickness of the hollow.

In the present embodiment, the bus bar may include a heat absorbing part to which the electrode leads are coupled, and a heat dissipating part bent and extended from the heat absorbing part and disposed adjacent to the cooling plate.

In the present embodiment, a heat transfer material interposed between the heat dissipation part and the cooling plate may be further included.

In the present embodiment, the cooling plate includes a first plate disposed on one side of the battery cell stack and a second plate disposed on the other side of the battery cell stack, and the bus bar includes the first A first radiating part disposed adjacent to the plate, and a second radiating part disposed adjacent to the second plate may be included.

In this embodiment, it may further include a cooling device coupled to the outer surface of the cooling plate.

In this embodiment, the hollow may be formed as a closed space.

The battery module according to an embodiment of the present invention uses a heat pipe to dissipate heat concentrated on a bus bar to a cooling plate. Accordingly, since heat concentrated on the electrode leads of the battery cell 10 can be rapidly released, the heat dissipation effect of the entire battery module can be improved.

1 is a perspective view schematically showing a battery module according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the battery module shown in Figure 1;
3 is an enlarged perspective view of the battery cell of FIG. 2.
4 is a partial cross-sectional view taken along line II′ of FIG. 1 in FIG. 2;
5 is an enlarged perspective view of the bus bar shown in FIG. 2.
6 is a cross-sectional view taken along line II-II' of FIG. 5;
7 is a cross-sectional view of a battery module according to another embodiment of the present invention.
Figure 8 is a perspective view of the bus bar shown in Figure 7;
9 is a perspective view of a bus bar according to another embodiment of the present invention.
10 is a cross-sectional view taken along line III-III' of FIG. 9;
11 is a perspective view of a bus bar according to another embodiment of the present invention.

Prior to the detailed description of the present invention, terms or words used in the present specification and claims described below should not be construed as being limited to their usual or dictionary meanings, and the inventors shall use their own invention in the best way. For explanation, based on the principle that it can be appropriately defined as a concept of terms, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application It should be understood that there may be water and variations.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that the same components in the accompanying drawings are indicated by the same reference numerals as possible. In addition, detailed descriptions of known functions and configurations that may obscure the subject matter of the present invention will be omitted. For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size.

For example, in the present specification, expressions such as upper, lower, lower, and side are described based on the drawings in the drawings, and it should be noted in advance that if the direction of the object is changed, it may be expressed differently.

1 is a perspective view schematically showing a battery module according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the battery module shown in FIG. 1. Here, for convenience of explanation, the cooling device 20 is illustrated only in FIG. 4 and omitted in FIGS. 1 and 2.

In addition, FIG. 3 is a perspective view illustrating an enlarged battery cell of FIG. 2, and FIG. 4 is a cross-sectional view taken along line II′ of FIG. 1.

Referring to FIGS. 1 to 4, the battery module 100 of the present embodiment may include a battery cell stack 1, a heat transfer member 90, a case 30, and a bus bar 70.

The battery cell stack 1 is formed by stacking a plurality of battery cells 10 shown in FIG. 4. In this embodiment, the battery cells 10 are stacked in a horizontal direction (or a horizontal direction). However, it is also possible to configure to be stacked in the vertical direction if necessary.

Each of the battery cells 10 may be a pouch type secondary battery, and the electrode lead 15 may have a structure in which the electrode lead 15 protrudes to the outside.

The battery cell 10 may be configured in a form in which an electrode assembly (not shown) is accommodated in the pouch 11.

The electrode assembly includes a plurality of electrode plates and electrode tabs, and is accommodated in the pouch 11. The electrode plate may be formed by alternately stacking a plurality of positive plates and a plurality of negative plates. In this case, electrode tabs are provided on each of the plurality of positive plates and the plurality of negative plates, and may be connected to the same electrode lead 15 by contacting each other with the same polarity.

In this embodiment, two electrode leads 15 are arranged to face in opposite directions to each other.

The pouch 11 is formed in a container shape to provide an inner space in which an electrode assembly and an electrolyte (not shown) are accommodated. In this case, a part of the electrode lead 15 of the electrode assembly is exposed to the outside of the pouch 11.

The pouch 11 may be divided into a sealing part 202 and a receiving part 204.

The receiving portion 204 is formed in a container shape to provide a square-shaped inner space. The electrode assembly and the electrolyte are accommodated in the inner space of the receiving part 204.

The sealing part 202 is a part that seals the circumference of the receiving part 204 by bonding a part of the pouch 11. Accordingly, the sealing portion 202 is formed in a flange shape extending outward from the receiving portion 204 formed in a container shape, and thus the sealing portion 202 is disposed along the outer periphery of the receiving portion 204.

A heat fusion method may be used for bonding the pouch 11, but is not limited thereto.

In addition, in the present embodiment, the sealing part 202 may be divided into a first sealing part 2021 in which the electrode lead 15 is disposed and a second sealing part 2022 in which the electrode lead 15 is not disposed.

In this embodiment, the pouch 11 is formed by forming a single exterior material. More specifically, after forming one or two receiving portions on one outer material, the outer material is folded so that the receiving portions form one space (ie, a receiving portion) to complete the pouch 11.

In this embodiment, the receiving portion 204 is formed in a square shape. In addition, a sealing part 202 formed by bonding an exterior material is provided on the outer periphery of the receiving part 204. However, as described above, it is not necessary to form the sealing portion 202 on the surface where the exterior material is folded. Therefore, in this embodiment, the sealing portion 202 is formed on the outer periphery of the receiving portion 204, and is provided only on three surfaces of the receiving portion 204, and is sealed on any one of the outer peripheries of the receiving portion (lower surface in FIG. 3). No additional deployment.

In this embodiment, since the electrode leads 15 are arranged to face opposite directions, the two electrode leads 15 are disposed on the sealing portions 202 formed on different sides. Therefore, the sealing part 202 of this embodiment is composed of two first sealing parts 2021 in which the electrode lead 15 is disposed, and one second sealing part 2022 in which the electrode lead 15 is not disposed. do.

In addition, the battery cell 10 according to the present exemplary embodiment comprises the sealing part 202 folded at least once in order to increase the bonding reliability of the sealing part 202 and minimize the area of the sealing part 202.

More specifically, the second sealing portion 2022 in which the electrode lead 15 is not disposed among the sealing portions 202 according to the present embodiment is folded twice and then fixed by the adhesive member 17.

For example, the second sealing part 2022 may be folded 180° along the first bending line C1 shown in FIG. 3 and then folded along the second bending line C2 again.

In this case, the adhesive member 17 may be filled inside the second sealing part 2022, and thus the second sealing part 2022 may be folded twice by the adhesive member 17. The adhesive member 17 may be formed of an adhesive having high thermal conductivity. For example, the adhesive member 17 may be formed of epoxy or silicon, but is not limited thereto.

In this embodiment, the adhesive member 17 is formed of a material different from that of the heat transfer member to be described later, but may be formed of the same material as necessary.

The battery cell 10 configured as described above may be a nickel metal hydride (Ni-MH) battery or a lithium ion (Li-ion) battery capable of charging and discharging.

The battery cells 10 are vertically erected in a case 30 to be described later, and are stacked and disposed in a horizontal direction. Accordingly, the battery cells 10 are disposed to be perpendicular to the first plate 50 and the second plate 40 disposed on the upper and lower sides of the battery cell stack 1, respectively.

Meanwhile, although not shown, at least one buffer pad may be disposed between the stacked battery cells 10.

The buffer pad may be provided to suppress the expansion of the entire volume of the battery cells when a specific battery cell expands. The buffer pad may be formed of a polyurethane foam, but is not limited thereto.

When the buffer pad is made of an adhesive material, the battery cells 10 may be bonded to each other by the buffer pad to form the battery cell stack 1. However, the present invention is not limited thereto, and a separate fixing member may be added to fix the stacked battery cells 10.

The case 30 defines the appearance of the battery module 100 and is disposed outside the plurality of battery cells 10 to protect the battery cells 10 from an external environment. In addition, the case 30 of the present exemplary embodiment discharges heat generated by at least a part of the battery cell to the outside and functions as a cooling plate for cooling the battery module. Therefore, in the following description, the'cooling plate' refers to at least one of the first plate 50 and the second plate 40 constituting the case 30.

The case 30 of this embodiment includes a first plate 50 disposed on one side of the battery cell stack 1, a second plate 40 disposed on the other side of the battery cells 10, and battery cells 10. ) May include a side cover 60 disposed on the side on which the electrode leads 15 are disposed.

The first plate 50 is disposed under the battery cell 10 to support the lower surface of the battery cells 10 and a side surface on which the accommodating portion 204 of the battery cells 10 is disposed It may include a side plate 58 for supporting. However, if necessary, it is also possible to configure the side plate 58 and the lower plate 52 as independent components.

The side plates 58 are formed extending from both sides of the lower plate 52, and are disposed on the sides of the battery cell stack 1 stacked in the left and right direction to support the receiving portion 204 of the battery cells 10 do.

In order to firmly support the battery cell 10, the side plate 58 may be configured to contact the receiving portion 204 of the battery cell 10. However, the present invention is not limited thereto, and various modifications may be made as necessary, such as interposing a heat dissipation pad or a buffer member between the side plate 58 and the receiving portion 204.

Since the first plate 50 configured as described above is used as a cooling plate, it is made of a material having high thermal conductivity such as metal. For example, the first plate 50 may be made of an aluminum material. However, the present invention is not limited thereto, and various materials may be used as long as the material has similar strength and thermal conductivity, even if it is not a metal.

The second plate 40 is disposed above the battery cells 10 and is coupled to the upper surfaces of the battery cells 10. Further, the second plate 40 is fastened to the upper end of the side plate 58 of the first plate 50. Therefore, when the second plate 40 is fastened to the first plate 50, the second plate 40 and the first plate 50 have a shape of a tubular member with an empty inside.

Since the second plate 40 is used as a cooling plate like the first plate 50, it is made of a material having high thermal conductivity such as metal. The second plate 40 may be made of an aluminum material. However, the present invention is not limited thereto, and various materials may be used as long as the material has similar strength and thermal conductivity, even if it is not a metal.

The first plate 50 and the second plate 40 may be coupled by welding or the like. However, the present invention is not limited thereto, and various modifications are possible, such as coupling in a sliding manner or coupling using fixing members such as bolts or screws.

The heat transfer member 90 may be filled between the battery cells 10 and the first plate 50 and between the battery cells 10 and the second plate 40.

The heat transfer member 90 transfers heat generated from the battery cell 10 to the case 30. To this end, the heat transfer member 90 is made of a material having high thermal conductivity. For example, the heat transfer member 90 may be formed of any one of thermal grease, thermal adhesive, epoxy resin, and heat dissipation pad, but is not limited thereto.

The heat transfer member 90 may be disposed on the inner surface of the case 30 in the form of a pad, or may be formed by applying it to the inner surface of the case 30 in a liquid or gel state.

The second sealing part 2022 may be disposed in a form embedded in the heat transfer member 90, and thus, heat radiated through the second sealing part 2022 is transferred to the first and second plates through the heat transfer member 90. (50, 40) can be quickly transmitted.

The heat transfer member 90 of the present embodiment has high insulating properties, and for example, a material having a dielectric strength in the range of 10 to 30 KV/mm may be used.

Accordingly, in the battery module 100 according to the present embodiment, even if the insulation is partially destroyed in the battery cell 10, the battery cell 10 and the case are formed by the heat transfer member 90 disposed around the battery cell 10. 30) insulation between them can be maintained.

In addition, since the heat transfer member 90 is disposed to fill a space between the battery cells 10 and the case 30, the overall rigidity of the battery module 100 is also reinforced.

Meanwhile, in the present embodiment, the heat transfer member 90 is disposed on both the upper and lower portions of the battery cell 10, but is not limited thereto, and only at one of the upper and lower portions of the battery cell 10 It is also possible to arrange the heat transfer member 90. Also, if necessary, the heat transfer member 90 may be disposed between the side plate and the side plate of the battery cell 10.

The side cover 60 is coupled to both sides of the battery cells 10 on which the electrode leads 15 are disposed.

The side cover 60 is coupled to the first plate 50 and the second plate 40 to complete the appearance of the battery module 100 together with the first plate 50 and the second plate 40.

The side cover 60 may be formed of an insulating material such as resin, and may have a through hole 62 for exposing the connection terminal 72 to the outside.

The side cover 60 may be coupled to the first plate 50 and the second plate 40 through fixing members such as screws or bolts. However, it is not limited thereto.

The bus bar 80 is formed in the form of a metal plate and is coupled to the electrode lead 15 of the battery cell 10. Accordingly, the battery cells 10 are electrically connected to each other through the bus bar 80, and are electrically connected to the outside through the connection terminal 79 connected to the bus bar 80.

5 is a perspective view illustrating an enlarged bus bar shown in FIG. 2, and FIG. 6 is a cross-sectional view taken along line II-II' of FIG. 5.

5 and 6 together, the bus bar 80 has a plurality of slit-shaped through holes 87 into which the electrode leads 15 are inserted, and the electrode leads 15 are bus bars ( After being inserted into the through hole 87 of the 80), it is bonded to the bus bar 80 through a method such as welding. Accordingly, at least a portion of the end of the electrode lead 15 may completely penetrate the bus bar 80 and be exposed to the outside of the bus bar 80.

The bus bar 80 may be connected to the connection terminal 79.

The connection terminal 79 is composed of a conductive member and is connected to at least one bus bar 80 or bonded to the bus bar 80 to electrically connect the battery cells 10 to the outside.

The bus bar 80 of this embodiment is formed in a bent plate shape. Specifically, the bus bar 80 has a heat absorbing part 81 to which the electrode leads 15 of the battery cell 10 are bonded, and a heat dissipation extending at a right angle to the heat absorbing part 81 at the lower end of the heat absorbing part 81 It can be divided into part 82.

The heat absorbing part 81 and the heat dissipating part 82 may be divided based on the bent part.

The heat absorbing part 81 is formed in a flat plate shape, and a plurality of through holes 87 are spaced apart from each other at regular intervals therein.

The radiating part 82 is bent in the heat absorbing part 81 and disposed in parallel with the lower plate 52 located under the battery cell stack 1 and disposed adjacent to the lower plate 52.

In order to effectively transfer the heat of the heat dissipation part 82 to the lower plate 52, a heat transfer material 95, such as a thermal paste, between the heat dissipation part 82 and the lower plate 52 (TIM: Thermal Interface Material) ) Is interposed.

The heat transfer material 95 may be formed of the same material as the heat transfer member 90, and may be formed as a part of the heat transfer member 90 if necessary. However, it is not limited thereto.

Since the bus bar 80 and the lower plate 52 must be electrically insulated, the heat dissipation unit 82 and the lower plate 52 are disposed at a predetermined interval, and a heat transfer material 95 is disposed in the spaced apart space. .

For insulation between the bus bar 80 and the lower plate 52, the heat transfer material 95 is formed of an electrically insulating material. In addition, the heat transfer material 95 may be formed to have a larger area than the area where the heat dissipation part 82 faces the lower plate 52.

The bus bar 80 of this embodiment has at least one hollow 88 therein.

The hollow 88 may be disposed between each of the plurality of through holes 87, and at least a portion may be disposed parallel to the electrode leads 15 coupled to the through hole 87. When a plurality of hollows 88 are provided, each of the hollows 88 may be formed as an independent space or formed as a single space connected to each other.

In this embodiment, the hollow 88 is formed as a closed space, and is formed throughout the heat absorbing part 81 and the heat dissipating part 82. However, the configuration of the present invention is not limited thereto, and it is also possible to configure the hollow as a space connected to the outside rather than a closed space as in the embodiment of FIG. 11 to be described later.

A fluid (not shown) causing a phase change due to heat may be filled in the hollow 88.

The body of the bus bar 80 may be formed of a material such as copper or aluminum that has no leakage and has pressure-resistant strength. In addition, the fluid filled in the hollow 88 may include any one of water, ammonia, acetone, methanol, and ethanol, but is not limited thereto.

The bus bar 80 absorbs heat transferred from the electrode lead 15 of the battery cell 10 in the heat absorbing unit 81. Accordingly, the fluid inside the bus bar 80 is vaporized by heat and moves to the heat dissipating part 82, and the vaporized fluid is condensed in the heat dissipating part 82 and releases latent heat of condensation to the outside.

In this process, the heat concentrated on the bus bar 80 is quickly transferred to the cooling plate. Therefore, it is possible to suppress concentration of heat on the bus bar 80.

Meanwhile, as shown in FIG. 4, in order to effectively cool the cooling plate, a cooling device 20 may be coupled to a lower surface of the first plate 50 and an upper surface of the second plate 40. For convenience of explanation, the cooling device 20 is illustrated only in FIG. 4.

The cooling device 20 of the present embodiment is a water-cooled cooling device having a cooling passage 22 therein. However, the configuration of the present invention is not limited thereto, and it is also possible to apply an air-cooled cooling device.

The cooling device 20 may be integrally coupled to the case 30 and included in the battery module 100. However, the present invention is not limited thereto, and may be provided in a device in which a battery module is mounted separately from the battery module.

In addition, for effective heat transfer, a thermal pad may be disposed between the first plate 50 or the second plate 40 and the cooling device 20.

The battery module 100 according to the present embodiment configured as described above is provided with a heat dissipation unit 82 on the bus bar 80, and through this, the heat concentrated on the bus bar 80 can be quickly discharged to the cooling plate. have. In addition, a fluid is filled inside the bus bar 80 to maximize heat transfer efficiency.

Accordingly, since the temperature of the bus bar 80 can be lowered during operation of the battery module, it is possible to prevent deterioration of the performance of the battery module due to heat.

Meanwhile, the present invention is not limited to the above-described embodiment, and various modifications are possible.

7 is a cross-sectional view of a battery module according to another embodiment of the present invention, and FIG. 8 is a perspective view of a bus bar shown in FIG. 7.

Referring to FIGS. 7 and 8, the bus bar 80 of the battery module according to the present embodiment includes a first heat dissipation part 82a disposed at the lower end of the heat absorbing part 81 and an upper part of the heat absorbing part 81. It includes a second heat dissipation part 82b.

The first heat dissipation part 82a is configured the same as the heat dissipation part 82 of the above-described embodiment, and the second heat dissipation part 82b is configured similarly to the first heat dissipation part 82a, and the upper end of the heat absorbing part 81 It differs only in that it is placed in.

The first heat dissipation part 82a is disposed adjacent to the lower plate 52, and the second heat dissipation part 82b is disposed adjacent to the second plate 40 positioned above the battery cell stack 1 .

As in the above-described embodiment, a heat transfer material 95 formed of an insulating material is disposed between the second heat dissipation portion 82b and the second plate 40.

In this case, since heat concentrated on the bus bar 80 can be simultaneously radiated to the lower plate 52 and the second plate 40, heat dissipation performance can be improved.

9 is a perspective view of a bus bar according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line III-III' of FIG. 9.

9 and 10, the bus bar 80 of the battery module according to the present embodiment includes a first area A1 in which a through hole 87 is disposed and a second area A2 in which the hollow 88 is disposed. Is formed differently in thickness.

More specifically, the hollow 88, the total thickness of the second area (A2) is formed (T ₂₎ is the first region the thickness of the (A1), (T ₁₎ to the thickness of the hollow 88 (T _3), the combined thickness Is formed by Accordingly, the second region A2 is configured to have the same _{thickness as the thickness T 1} of the first region A1 except for the thickness _{T 3} of the hollow 88 from the _{total thickness T 2.}

Through this configuration, the electrical resistance in the second region A2 in which the hollow 88 is formed is maintained equal to the electrical resistance in the first region A1. Accordingly, even if the hollow 88 is provided, the electric resistance inside the bus bar 80 can be uniformly maintained.

In addition, since a bend is formed in a portion where the first region A1 and the second region A2 are connected, the overall rigidity of the bus bar 80 can be increased.

11 is a perspective view of a bus bar according to another embodiment of the present invention.

Referring to FIG. 11, the bus bar 80 of the battery module according to the present embodiment is formed similarly to the bus bar shown in FIG. 9, and the hollow 88 is not formed as a closed space, but is a space connected to the outside. Is formed by

Specifically, in this embodiment, both ends of the hollow 88 are opened in the form of openings, so that a fluid such as air from the outside of the bus bar 80 flows into the hollow 88 or inside the hollow 88 The fluid may be discharged to the outside of the bus bar (80).

When the bus bar 80 is configured as described above, since the inner surface of the hollow 88 may contact air, heat dissipation efficiency may be increased through convection of air.

On the other hand, the hollow structure of this embodiment can be applied equally to the busbar shown in FIG. 5 or 8.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

For example, in the above-described embodiments, the cooling device is disposed outside the first plate and the second plate, but the cooling device is disposed inside the first plate and the second plate, or Various modifications are possible, such as configuring the second plate to include a cooling passage. In addition, each of the embodiments may be implemented in combination with each other.

100: battery module
1: battery cell stack
10: battery cell
20: cooling system
30: case
40: second plate
50: first plate
60: side cover
80: bus bar
88: hollow

Claims (11)

A battery cell stack in which a plurality of battery cells are stacked;
A cooling plate disposed outside the battery cell stack to dissipate heat generated from the battery cells to the outside;
A bus bar to which electrode leads provided in the battery cells are bonded;
Including,
The busbar is a battery module having at least one hollow disposed parallel to the electrode leads.
The method of claim 1,
A battery module further comprising a fluid filled in the hollow to cause a phase change due to heat.
The method of claim 2, wherein the fluid,
A battery module containing any one of water, ammonia, acetone, methanol, and ethanol.
The method of claim 1, wherein the bus bar,
It has a plurality of through holes into which the electrode leads are inserted and disposed,
The hollow is a battery module disposed between the through holes.
The method of claim 4, wherein the bus bar,
The battery module in which the thickness of the second area in which the hollow is disposed is thicker than the thickness of the first area in which the plurality of through holes are disposed.
The method of claim 5,
The thickness of the second area is formed equal to the sum of the thickness of the first area and the thickness of the hollow.
The method of claim 1, wherein the bus bar,
A heat absorbing part to which the electrode leads are coupled; And
A radiating part bent and extended from the heat absorbing part and disposed adjacent to the cooling plate;
Battery module comprising a.
The method of claim 7,
Battery module further comprising a heat transfer material interposed between the heat dissipation part and the cooling plate.
The method of claim 7,
The cooling plate is
A first plate disposed on one side of the battery cell stack, and a second plate disposed on the other side of the battery cell stack,
The bus bar includes a first heat radiating part disposed adjacent to the first plate, and a second radiating part disposed adjacent to the second plate.
The method of claim 1,
Battery module further comprising a cooling device coupled to the outer surface of the cooling plate.
The method of claim 1, wherein the hollow,
Battery module formed into an enclosed space.

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