KR200464432Y1 - Secondary battery module containing heat plate of effective temperature control - Google Patents

Abstract

The present invention relates to a secondary battery module, and more particularly to a secondary battery module including a heat dissipation plate for a secondary battery effective for temperature control of the unit battery when the unit cell is connected to configure the battery module.

Rechargeable battery, module, heat dissipation

Description

Secondary battery module including heat dissipation plate for efficient temperature control of unit cell {SECONDARY BATTERY MODULE CONTAINING HEAT PLATE OF EFFECTIVE TEMPERATURE CONTROL}

The present invention relates to a secondary battery module, and more particularly to a secondary battery module including a heat dissipation plate for a secondary battery effective for temperature control of the unit battery when the unit cell is connected to configure the battery module.

A secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. A low battery is used for portable small electronic devices such as mobile phones, laptop computers, and camcorders. It is widely used as a power source for driving motors in automobiles and the like.

The secondary battery may be manufactured in various shapes, and typical shapes include cylindrical and rectangular shapes. The secondary battery may include the high output secondary battery so that the secondary battery may be used for driving a motor such as an electric vehicle. A plurality of secondary batteries are connected in series to form a large capacity secondary battery.

As described above, one large-capacity secondary battery assembly (hereinafter referred to as a battery module) is composed of a plurality of secondary batteries (hereinafter referred to as unit cells) that are usually connected in series, wherein each unit cell has a positive electrode plate and a negative electrode plate between the separators. A case having an electrode assembly positioned and positioned therein, a case having a space in which the electrode assembly is embedded, a cap assembly coupled to the case to seal the case, a current collector of the positive and negative electrode plates protruding from the cap assembly, and provided in the electrode assembly; It includes a positive and negative terminal electrically connected.

In the case of the rectangular battery, each of the unit cells cross-aligns each of the unit cells such that the positive electrode terminal and the negative electrode terminal protruding from the top of the cap assembly alternate with the positive terminal and the negative terminal of the neighboring unit cell, and the threaded negative electrode terminal A battery module is constructed by connecting and installing a conductor between nuts between terminals.

Here, the battery module should be able to easily dissipate heat generated in each unit battery by forming one battery module by connecting a few to many dozens of unit cells. The heat dissipation characteristics of the secondary battery module are very important to influence the performance of the battery.

When heat is not released properly, heat generated from a unit cell causes an increase in the temperature inside the cell, resulting in a decrease in battery performance and, in severe cases, a risk of explosion. In particular, when the secondary battery module is applied as a large-capacity secondary battery for driving a motor of an electric vacuum cleaner, an electric scooter, or an automobile (electric vehicle or a hybrid electric vehicle), since the secondary battery module is charged and discharged with a large current, the internal reaction of the secondary battery according to the use state is performed. Heat is generated and rises to a considerable temperature. In particular, the HEV battery module used especially for a vehicle is charged and discharged with a large current, so that heat is generated by the internal reaction of the secondary battery according to the use state, and the temperature rises to a considerable temperature. Heat generated in each unit cell causes an increase in the temperature of the battery module, resulting in a malfunction of the device to which the battery module is applied, thereby affecting the inherent characteristics of the battery, thereby degrading the performance of the battery. Therefore, heat dissipation is most important.

1 shows a structure of a heat sink used in a conventional battery. The heat sink is used between the unit cell and the unit cell to discharge heat generated inside the cell. Referring to the large-capacity battery module shown in FIG. 1, a plurality of unit cells 10 generating power by having an electrode assembly in which a positive electrode plate and a negative electrode plate are disposed with a separator interposed therebetween are disposed at a plurality of unit cells 10, and A heat dissipation plate 30 for dissipating heat generated from the unit cells to the outside between the unit cells 10 is interposed and is in close contact with the entire surface of the unit cells 10.

The battery module may be installed in a separate housing (not shown) constituting an outer case, in which case the cooling air supplied to the housing is interposed between the unit cell 10 and the unit cell 10. In the process, the heat generated from the unit cell is exchanged, and the exchanged air is discharged to the outside of the housing to finally discharge the heat generated from the unit cell to the outside.

In the battery module having the above structure, the heat dissipation plate 30 is a plate structure having a size corresponding to the front surface of the unit cell 10, and the front surface contacts the front surface of one side of the unit cell 10, and one side end thereof is the unit battery. The predetermined length is extended beyond the outside of the one side, the cooling channel 31 is formed in a groove shape formed at a predetermined interval on the front side. The heat dissipation plate 30 forms a single flow path while the surface on which the cooling channel 31 is formed is in contact with the front surface of one side of the unit cell 10, and the cooling plate 30 passes through the cooling air through the flow path. ) Is a heat dissipation action by the cooling air passing through the cooling channel 31 together with its own heat dissipation, thereby exhibiting the cooling effect of the unit cell.

However, although the heat generation degree according to each part of the battery remains different, in the case of the conventional heat sink, all the cooling channels are formed at the same intervals over the entire surface of the battery to generate a lot of heat and generate less heat. There was a problem that the cooling effect of the parts to be different.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a secondary battery module effective for temperature control of a unit battery constituting the secondary battery module.

In order to achieve the above object, the secondary battery module of the present invention has a battery module including a plurality of unit cells arranged at intervals, wherein a heat dissipation plate for dissipating heat generated from the unit cells is installed between the unit cells. At least one cooling channel through which the cooling medium flows is formed at one side of the heat dissipation plate.

The heat dissipation plate of the present invention is a plate structure, the front surface is in contact with one side of the unit cell, the side end is a structure extending a predetermined length past the outside of the unit cell is a structure that radiates heat generated in the unit cell to the outside. .

The width of the cooling channel of the heat dissipation plate of the present invention is configured such that the length at the portion where heat is generated is shorter than the length at the portion where the heat is generated.

The width of the cooling channel of the heat dissipation plate of the present invention is configured to be longer from the top of the battery protruding from the battery tab toward the bottom of the battery, specifically, the width of the cooling channel is 1 mm to 5 in the upper part of the battery protruding from the battery tab mm, the bottom of the cell is 15 mm to 20 mm and is configured such that the width of the cooling channel gradually increases from the top of the cell from which the cell tab protrudes to the bottom of the cell.

In addition, the heat dissipation plate is not particularly limited as long as it is a material having high thermal conductivity so as to receive heat from a unit cell and radiate it to the outside, preferably, aluminum, an aluminum alloy, or a metal composite material may be used.

The heat dissipation plate may be interposed between each unit cell in a plurality of unit cells stacked and may be interposed between at least two unit cells.

The cooling medium supplied to the heat dissipation plate may be made of air or made of cooling water.

In addition, the secondary battery module is an energy source for driving a motor of the device in a device that operates by using a motor such as a hybrid electric vehicle (HEV), an electric vehicle (EV), a wireless cleaner, an electric bicycle, an electric scooter, and the like. Can be used as.

In the case of the heat dissipation plate according to the present invention, in consideration of the heat generation in the unit cell, the upper part of the cell protruding from the heat generating tabs has a small gap between the cooling channels, and the lower part of the battery generating less heat between the cooling channels. By widening the interval, there is an effect of increasing the cooling efficiency in the unit cell.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

2 is a simulation result of the degree of heat generation on the surface of the battery. As shown in FIG. 2, it can be seen that heat generation is most generated at the portion where the battery tab protrudes, and heat generation decreases toward the bottom of the battery. In other words, when the battery is schematically illustrated as shown in FIG. 3, heat is most emitted from the A portion, which is the upper part of the battery from which the tab protrudes, and less heat is generated toward the E portion, which is the bottom of the battery. Therefore, the cooling channel formed on the heat dissipation plate is different depending on the degree of heat generation on the surface of the battery, and formed at a narrow interval in the upper portion where the tabs that generate a lot of heat, and the gap toward the bottom portion where less heat is generated. It is preferable to make it wider to increase the heat radiation efficiency.

4 is a perspective view of a heat dissipation plate 300 according to an embodiment of the present invention, Figure 5 is a cross-sectional view when the heat dissipation plate according to an embodiment of the present invention is installed on both sides of the unit cell 100. As shown in FIGS. 4 and 5, the heat dissipation plate 300 of the present invention has a short width of the cooling channel 310 in the upper part of the cell where the heat generating tab 200 protrudes based on the result of FIG. 2. In addition, the width of the cooling channel becomes longer toward the bottom of the battery.

If the width of the cooling channel is shortened, the number of cooling channels 310 occupying per unit length of the heat sink increases, and the heat dissipation area is increased. However, if the width of the cooling channel is too narrow, the ventilation resistance increases and the flow of the refrigerant becomes poor, resulting in cooling efficiency. It will fall. On the other hand, if the width of each channel is increased, the ventilation resistance is reduced, but it becomes difficult to apply a uniform load to the battery, and the heat dissipation area is reduced. Therefore, the distance between the cooling channels is appropriate in consideration of the ventilation resistance and the heat dissipation area. It is necessary to choose.

As shown in FIG. 6, when the channel spacing d and the channel height h are the cooling channels in the present invention, the width d of each channel gradually increases from the top of the cell where the tab protrudes to the bottom of the cell. Configure to

In the case of part A in FIG. 3, in which a lot of heat is generated, the width of the cooling channel is preferably 1 mm to 5 mm. If it is 1 mm or less, the ventilation resistance is increased to improve the flow of the refrigerant, and as a result, the cooling efficiency is lowered. If it is 5 mm or more, the heat dissipation area is reduced to cool the generated heat. In addition, it is preferable to set it as 15 mm-20 mm in the E part in FIG. 3 with little heat generation. If it is 15 mm or less, the heat dissipation area is large to cool the generated heat, but if it is 20 mm or more, the cooling efficiency may be reduced.

1 illustrates a conventional secondary battery module.

2 shows the results of simulation of the degree of heat generation on the battery surface.

3 shows the result of separating the battery surface according to the degree of heat generation on the battery surface.

4 is a perspective view of a heat radiation plate according to the present invention.

5 is a cross-sectional view when the heat dissipation plate according to the present invention is installed on both sides of the battery.

6 is a cross-sectional view schematically showing a cooling channel of the heat dissipation plate according to the present invention.

Claims (10)

In the battery module comprising a plurality of unit cells arranged at intervals, A heat dissipation plate is disposed between the unit cells to dissipate heat generated in the unit cells, The heat dissipation plate is formed with at least one cooling channel through which a cooling medium flows, The width of the cooling channel is gradually longer from the top of the battery protruding from the battery tab toward the bottom of the battery, from 1 mm to 5 mm at the top of the battery protruding battery tab, the bottom of the battery is 15 mm to 20 mm, The heat dissipation plate is a secondary battery module that is made of aluminum, aluminum alloy or metal composite material. delete delete delete delete The method of claim 1, The heat dissipation plate is a secondary battery module interposed between each unit battery. The method of claim 1, The heat dissipation plate is a secondary battery module is interposed between two or more unit cells. The method of claim 1, The secondary battery module of the cooling medium supplied to the heat dissipation plate is air. The method of claim 1, Cooling medium supplied to the heat dissipation plate is a coolant secondary battery module. The method of claim 1, The battery module is a secondary battery module for driving a motor.

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