KR102113155B1 - Battery module and battery pack - Google Patents

Abstract

The present invention combines a heat dissipation plate to form an opening in a case in which the pouch cell is accommodated, and covers and covers the opening, and performs an insulation and heat dissipation function by interposing an insulating sheet between the pouch cell and the heat dissipation plate, thereby forming a gas discharge hole in the case It relates to a battery module and a battery pack having a structure that can easily discharge the gas generated in the pouch cell.

Description

Battery module and battery pack {Battery module and battery pack}

The present invention relates to a battery module and a battery pack having a structure capable of easily discharging the gas generated in the pouch cell while the case in which the pouch cell is accommodated has insulation and heat dissipation functions.

In general, secondary batteries, unlike primary batteries, can be charged and discharged, so they are applied to various fields such as digital cameras, cell phones, laptops, and hybrid cars, and active research is underway. Examples of the secondary battery include a nickel-cadmium battery, a nickel-metal hydride battery, a nickel-hydrogen battery, and a lithium secondary battery. And among secondary batteries, many studies have been conducted on lithium secondary batteries having high energy density and discharge voltage, and they are commercially used and widely used.

In addition, the lithium secondary battery can be manufactured in various forms. Representative shapes include a cylindrical type and a prismatic type, which are mainly used in lithium ion batteries. It is manufactured in a pouch type, so its shape is relatively free.

Here, since the pouch type lithium secondary battery has a weak mechanical strength of the pouch, a pouch cell (battery cell) is accommodated inside the case to form a battery module. At this time, the battery module is formed in a form in which the case is coupled and sealed so that the positive electrode terminal and the negative electrode terminal are exposed to the outside of the case after the battery cell is accommodated in the case.

However, the battery module is generally formed to be sealed by surrounding the exterior of the pouch cell with a metal case having excellent heat dissipation performance such as aluminum. However, since the case of a metal material such as aluminum is not insulated, there is a problem in that current may leak out when the insulation of the pouch cell is destroyed.

In addition, when the pouch-shaped cell is configured to be sealed by a case made of an insulating material such as plastic for insulation, the case made of plastic has a disadvantage of deteriorating heat dissipation performance and deteriorating performance and life of the battery module.

In addition, the pouch cell has a structure capable of discharging gas to the case surrounding the pouch cell because the gas is generated from the inside due to the swelling phenomenon during charging and discharging, and thus the gas can be discharged to the outside. When a plurality of modules are stacked to form a battery pack, a structure in which a plurality of battery modules can be connected for gas discharge is required.

US 2012-0237815 A1 (2012.09.20.)

The present invention has been devised to solve the problems as described above, and an object of the present invention is to have a structure in which a case in which a pouch cell is accommodated can function to insulate and dissipate heat while easily discharging gas generated in the pouch cell. It is to provide a battery module and a battery pack.

The battery module of the present invention for achieving the above object, a pouch cell in which electrode tabs are formed on one or both sides of the electrode body; It is combined to surround the outside of the pouch cell, the inside of the pouch cell is inserted to form an inner portion, and an opening is formed to open the portion where the inner portion is formed, and is coupled to the electrode tab of the pouch cell. A pair of cases in which a terminal withdrawal groove is formed so that the electrode terminal is withdrawn to the outside, and gas discharge holes penetrating sideways are formed in a portion where the electrode tab of the pouch cell is located; A pair of heat dissipation plates coupled to the outsides of the pair of cases to surround the openings; And an insulating sheet interposed between the inside of the heat dissipation plate and the electrode body of the pouch cell. It includes.

In addition, the pair of cases includes a first case and a second case, a communication protrusion is formed around the outside of the gas discharge hole formed in the first case, and the gas discharge hole formed in the second case It is formed the same as the outer diameter of the communication projection.

At this time, two or more gas discharge holes and communication protrusions formed in the first case and the second case are formed.

In addition, the rim of the insulating sheet is interposed between the heat dissipation plate and the case to be in close contact.

In addition, the heat dissipation plate is formed to bend the rim to surround the side of the case.

In addition, the heat dissipation plate is formed with an incision in which a corner portion of the bent edge is cut.

In addition, the battery pack of the present invention is formed by stacking a plurality of battery modules, and the communication protrusions of the battery modules are inserted into the gas discharge holes of neighboring battery modules so that the battery modules communicate with each other.

The battery module of the present invention has an advantage in that the case in which the pouch cell is accommodated can function to insulate and dissipate heat while simultaneously discharging the gas generated in the pouch cell.

In addition, in a battery pack in which a plurality of battery modules are stacked, a gas outlet for gas discharge of the battery modules is easily connected, and thus there is an advantage in that the configuration of the battery pack and the gas discharge are easy.

1 and 2 is an assembled perspective view and an exploded perspective view showing a battery module according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA ′ in FIG. 1.
4 and 5 are partially enlarged views of the upper and lower sides of FIG. 3.
Figure 6 is an assembled perspective view showing a battery pack according to an embodiment of the present invention.
7 and 8 are vertical and horizontal cross-sectional views of FIG. 6.

Hereinafter, a battery module and a battery pack of the present invention as described above will be described in detail with reference to the accompanying drawings.

1 and 2 is an assembled perspective view and an exploded perspective view showing a battery module according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along AA 'in FIG. 1, and FIGS. 4 and 5 are upper and lower sides of FIG. It is a partial enlarged view.

As illustrated, the battery module 1000 according to an embodiment of the present invention includes: a pouch cell 100 in which electrode tabs 120 are formed on one or both sides of the electrode body 110; It is coupled to surround the outside of the pouch cell 100, the electrode body 110 portion of the pouch cell 100 is inserted to be placed inside the inside portion 220 is formed, the portion inside the inside portion 220 is formed An opening 210 is formed to be opened, a terminal withdrawal groove 230 is formed so that the electrode terminal 140 coupled to the electrode tab 120 of the pouch cell 100 is drawn out, and the pouch cell A pair of cases 200 in which gas discharge holes 270 penetrated sideways are formed in a portion where the electrode tab 120 of the (100) is located; A pair of heat dissipation plates 300 coupled to the outsides of the pair of cases 200 to surround the opening 210; And an insulating sheet 400 interposed between the inside of the heat dissipation plate 300 and the electrode body 110 of the pouch cell 100; It includes.

First, the pouch cell 100 includes an electrode body 110, an electrode tab 120 and a pouch 130. In addition, the electrode body 110 is composed of a positive electrode, a negative electrode, an electrolyte, and a separator separating the positive electrode and the negative electrode, which is a portion where electricity is charged and discharged, and the electrode tab 120 is generated when discharged from the electrode body 110 or externally. It is the part that transmits the current flowing in when charging from. And the pouch cell 100 is formed so that the electrode body 110 is enclosed by an insulating material pouch 130 and is drawn out of the pouch 130 of the electrode tab 120. In addition, the electrode body 110 sealed by the pouch 130 may be a shape protruding only on one side with respect to the pouch 130, or a shape protruding on both sides, and the electrode tab 120 is illustrated As described above, a pair may be formed on the upper side of the electrode body 110, or the electrode tabs 120 may be formed on both sides of the electrode body 110 one by one. In addition, the pouch cell 100 may be provided by stacking one or two sheets, and hereinafter, it will be described as an embodiment in which two pieces of the pouch cells 100 are stacked. In addition, the electrode tab 120 may be coupled to the electrode terminal 140 by laser welding, and one of the electrode terminals 140 may be a voltage sensing terminal for measuring the voltage of the pouch cell 100. In addition, the electrode tabs 120 may be coupled to the electrode terminal 140 so that the pouch cells 100 are connected in series or in parallel.

The case 200 may be formed of an insulating material such as plastic, and is formed of a pair of first cases 200a and second cases 200b to be coupled to surround the outside of the pouch cell 100. At this time, the pair of cases 200 is formed with an inner portion 220 so that the electrode body 110 of the pouch cell 100 is inserted and placed thereon, and one surface of the pouch 130 which is an edge of the pouch cell 100 The electrode body 110 may be stably placed on the mounting portion 220 by being caught by the stepped 221 of the mounting portion 220. And the case 200 is formed with an opening 210 so that the portion where the inside portion 220 is formed is opened. That is, the inner portion of the stepped portion 221, on which the rest portion 220 is formed, is formed to be opened in a perforated form. In addition, the case 200 has a terminal withdrawal groove 230 in a partially cut-out form so that the electrode terminal 140 coupled to the electrode tab 120 of the pouch cell 100 can be drawn out. Here, a pair of cases 200 are formed with gas discharge holes 270 penetrating sideways, respectively. That is, the gas discharge hole 270 is formed in the surface and direction (width direction) facing the first case 200a and the second case 200b, and the electrode tab 120 of the pouch cell 100 is located. Is formed in parts. In addition, a hook 250 for protruding coupling is formed in the first case 200a, and a coupling hole 240 is formed in the second case 200b so that the hook 250 is inserted and coupled. Thus, the first case 200a and the second case 200b may be combined to be fitted with each other.

The heat dissipation plate 300 is respectively coupled to the outside of the pair of cases 200 so as to surround the opening 210 of the case 200. That is, the openings 210 formed in the first case 200a and the openings 210 formed in the second case 200b are respectively covered by the heat dissipation plate 300 to be blocked. At this time, the heat dissipation plate 300 is coupled such that the inside of the edge is in close contact with the outside of the case 200, so that the opening 210 is completely enclosed by the heat dissipation plate 300. In addition, the heat dissipation plate 300 may be formed of a metal plate material such as an aluminum material to easily discharge heat generated from the pouch cell 100 to the outside, and a locking groove 311 is formed in the heat dissipation plate 300 and the case The locking protrusions 260 are formed on the 200, and the heat dissipation plate 300 may be coupled to the case 200.

The insulating sheet 400 is interposed between the heat dissipation plate 300 and the electrode body 110 of the pouch cell 100. That is, the insulating sheet 400 is interposed for insulation between the heat dissipation plate 300 and the pouch cell 100, and may be inserted into the same shape as the size of the opening 210. In addition, the insulating sheet 400 is preferably formed of a material having high thermal conductivity so that heat generated from the pouch cell 100 is smoothly transferred to the heat dissipation plate 300.

Thus, the two pouch cells 100 are stacked so as to be in close contact, and the electrode terminals 140 including one voltage sensing terminal are coupled to the electrode tab 120 of the pouch cells 100, and the heat dissipation plate 300 is provided in the case 200. ) After combining the insulating sheet 400, the battery module 1000 of the present invention may be assembled by combining the case 200 so that the two pieces of the assembled pouch cell 100 are accommodated inside the case 200.

Due to this, the battery module of the present invention, pouch cells are surrounded by an insulating case and an insulating sheet such as plastic and electrically insulated, so that even if the insulation of the pouch cell is destroyed, electricity may not leak to the outside.

In addition, since heat generated in the pouch cell can be discharged to the outside through a heat dissipation plate, there is an advantage of easy cooling of the pouch cell.

In addition, there is an advantage that the gas generated by the swelling phenomenon of the pouch cell can be easily discharged through the gas discharge hole formed on the side of the case of the portion where the electrode tab of the pouch cell is located.

In addition, the pair of cases 200 includes a first case (200a) and a second case (200b), the communication protrusions around the outer periphery of the gas discharge hole 270 formed in the first case (200a) 280 is formed, and the gas discharge hole 270 formed in the second case 200b is formed to be the same as the outer diameter of the communication protrusion 280.

That is, a short tube-shaped communication protrusion 280 is formed to protrude in the width direction to the outside of the gas discharge hole 270 formed in the first case 200a, and the communication protrusion is provided to the second case 200b on the opposite side. The gas discharge hole 270 is formed to have the same diameter as the outer diameter of 280, and thus, when two or more battery modules 1000 are stacked so that a wide plane contacts in a width direction, interlocking protrusions of one battery module (280) ) Is inserted into the gas discharge hole 270 of the neighboring battery module, and the passage through which the gas is discharged can communicate with each other, and there is an advantage that the movement of the battery modules can be fixed in the height direction and the length direction.

At this time, two or more gas discharge holes 270 and communication protrusions 280 formed in the first case 200a and the second case 200b are formed.

As shown in the figure, the gas discharge holes 270 are spaced apart in the longitudinal direction to form two, and two communication protrusions 280 are formed so that the communication protrusions 280 are inserted into and coupled to the gas discharge holes 270, so that the two The above is to prevent the battery module from being fixed and rotated when the battery modules are stacked and combined. At this time, the communication protrusions 280 are formed only in one gas discharge hole 270 in the first case 200a, and the communication protrusions 280 are formed in only one gas discharge hole 270 in the second case 200b. , Communication protrusions 280 may be formed on opposite sides facing each other. In addition, although not shown in the drawing, the communication protrusions 280 are formed in both of the two gas discharge holes 270 of the first case 200a, and only two gas discharge holes 270 are formed in the second case 200b. It can also be formed. In addition, the arrangement of the communication protrusions 280 may be formed in various forms.

In addition, an edge of the insulating sheet 400 may be interposed between the heat dissipation plate 300 and the case 200 to be in close contact.

That is, the rim of the insulating sheet 400 is interposed between the heat dissipation plate 300 and the case 200 so as to be insulated from the pouch cell 100 more reliably. At this time, the insulating sheet 400 may be in close contact with each other after interposing a plate-shaped insulating sheet 400 between the case 200 and the heat-radiating plate 300, and an insulating sheet inside the heat-radiating plate 300. After attaching 400, the heat dissipation plate 300 may be coupled to the case 200, or an insulating material may be coated on the inside of the heat dissipation plate 300 to be coated and then coupled to the case 200.

In addition, the heat dissipation plate 300 may be formed to bend the rim to surround the side of the case 200.

This is formed by bending the rim of the heat dissipation plate 300 to be bent 310, and the heat dissipation plate 300 is formed to surround the three sides of the side of the case 200, thereby bending the longitudinal direction of the heat dissipation plate 300 Since heat can be released through both sides and the lower side in the height direction, it has an advantage of improving the cooling performance of the battery module. In addition, the heat dissipation plate 300 is formed so that the locking groove 311 is formed in the bent portion 310 so that the locking protrusion 260 of the case 200 is caught in the locking groove 311 so that the heat radiation plate 300 is formed. It may be coupled to the case 200.

In addition, the heat dissipation plate 300 may be formed with an incision portion 320 in which an edge portion of a bent edge is incised.

This is when the edge portion of the heat dissipation plate 300 is bent and formed as the bent portion 310, the bent corner portion is cut and formed as the incised portion 320, so that the lower side in the height direction and the both sides in the longitudinal direction when bending. Since there is no interference between the bent portions 310, there is an advantage in that it is easy to bend to form a heat radiation plate.

6 is an assembled perspective view showing a battery pack according to an embodiment of the present invention, and FIGS. 7 and 8 are vertical and horizontal cross-sectional views of FIG. 6.

As shown, the battery pack 2000 according to an embodiment of the present invention is formed by stacking a plurality of the battery modules 1000, and the communication protrusions 280 of the battery modules 1000 are neighboring battery modules. Inserted into the gas discharge hole 270 of (1000), the battery modules 1000 may be coupled to communicate with each other. That is, as described above, a plurality of battery modules 1000 are stacked in the width direction so that the communication protrusion 280 of one battery module 1000 is inserted into the gas discharge hole 270 of the other battery module 1000 adjacent to each other. By being combined, it is easy to fix the positions of the battery modules 1000 and to facilitate the connection of passages through which gas can be discharged.

The present invention is not limited to the above-described embodiments, and of course, the scope of application is various, and anyone who has ordinary knowledge in the field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible.

1000: battery module
100: pouch cell
110: electrode body 120: electrode tab
130: pouch 140: electrode terminal
200: case
200a: first case 200b: second case
210: open part 220: enclosed part
221: stepped 230: terminal withdrawal groove
240: coupling hole 250: hook
260: jam projection 270: gas outlet
280: connecting protrusion
300: heat dissipation plate
310: bent portion 311: engaging groove
320: incision
400: insulating sheet
2000: Battery pack

Claims (7)

A pouch cell in which electrode tabs are formed on one or both sides of the electrode body;
The pouch cell is interposed between the two sides of the pouch cell, the pouch cell is accommodated in the inner space formed by the coupling, and surrounds the outside of the pouch cell. An inner portion is formed so that the electrode body portion of the pouch cell is inserted and settled. An opening portion is formed in a form in which the inside of the portion is perforated, and an electrode terminal coupled to the electrode tab of the pouch cell is withdrawn to the outside;
A pair of heat dissipation plates coupled to the outsides of the first case and the second case to surround the opening; And
An insulating sheet interposed between the inside of the heat dissipation plate and the electrode body of the pouch cell; It includes,
The first case and the second case are electrically insulating materials, the heat dissipation plate is a thermally conductive plate material, and the insulating sheet is an electrically insulating material and at the same time a battery module that is a thermally conductive material.
According to claim 1,
In the first case and the second case, gas discharge holes penetrating sideways are formed in a portion where the electrode tab of the pouch cell is located,
A battery module in which a communication protrusion is formed around an outer circumference of the gas discharge hole formed in the first case, and a gas discharge hole formed in the second case is formed to be the same as the outer diameter of the communication protrusion.
According to claim 2,
A battery module formed of two or more gas discharge holes and communication protrusions formed in the first case and the second case.
According to claim 1,
A battery module having an edge of the insulating sheet interposed between the heat dissipation plate and the case to be in close contact.
According to claim 1,
The heat dissipation plate is a battery module is formed to surround the side of the case by bending the rim.
The method of claim 5,
The heat dissipation plate is a battery module in which an incision is formed with an incision of an edge of a bent edge.
A plurality of battery modules of claim 2 or 3 are formed by stacking,
A battery pack in which the communication protrusions of the battery modules are inserted into a gas discharge hole of a neighboring battery module so that the battery modules communicate with each other.

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