KR100684758B1 - Secondary battery module - Google Patents

Abstract

The present invention relates to a secondary battery module which enables efficient temperature control and compact module configuration of a module by applying carbon fiber having excellent heat transfer efficiency as a material of internal components of a secondary battery module. And a housing having a suction port and a discharge port so as to distribute the cooling medium, and a plurality of unit cells embedded in the space part of the housing, wherein the carbon fiber is formed in at least one component in which the cooling medium and the heat are transferred. Is done.

Secondary battery module, carbon fiber, fiber hair, heat dissipation area

Description

Secondary Battery Module {SECONDARY BATTERY MODULE}

1 is a side cross-sectional view of a rechargeable battery module according to an embodiment of the present invention.

2 is a perspective view illustrating in detail a case of a rectangular secondary battery applied in a secondary battery module according to an exemplary embodiment of the present invention.

Figure 3 is a perspective view showing in detail the case of the cylindrical secondary battery applied in the secondary battery module according to an embodiment of the present invention.

4 is a partially cutaway perspective view of a partition wall applied in a rechargeable battery module according to an exemplary embodiment of the present invention.

5 is a perspective view of a CPU on a BMS circuit board applied to a secondary battery module according to an embodiment of the present invention.

6 is a perspective view of a thermoelectric element applied to an inner side of a housing of a rechargeable battery module according to an exemplary embodiment of the present invention.

The present invention relates to a secondary battery module, and more particularly, by applying carbon fiber (excellent heat transfer efficiency) as a material of internal components to enable efficient temperature control and compact module configuration, light weight and long life of the module It relates to a secondary battery module that enables extension.

As is well known, a secondary battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable. That is, in the case of a low-capacity battery in which one battery cell is packaged in a pack form, a low-capacity battery is used in a portable electronic device such as a phone, a notebook computer, or a camcorder, and in the case of a high-capacity battery in a battery pack unit in which dozens of battery cells are connected, It is widely used as a power source for driving motors of hybrid vehicles.

Such secondary batteries are manufactured in various shapes, and representative shapes thereof include cylindrical and rectangular shapes. In order to use the motor for driving an electric vehicle, a plurality of high-output secondary batteries are connected in series to constitute a large capacity secondary battery. Done.

The above-described large capacity secondary battery (hereinafter referred to as a secondary battery module) is composed of a plurality of secondary batteries (hereinafter, referred to as unit cells) which are usually connected in series, and each unit cell includes a separator between a positive electrode plate and a negative electrode plate. A case having an electrode group disposed and formed, a case having a space in which the electrode group is embedded, a cap assembly coupled to the case and sealing the electrode group, a cathode plate and a cathode plate protruding outwards through the cap assembly and provided in the electrode group. It includes a positive terminal and a negative terminal electrically connected to the current collector of.

Here, the secondary battery module in the case where the unit cell is generally rectangular, the positive electrode terminal and the negative electrode terminal protruding to the cap assembly is arranged so as to cross the positive terminal and the negative terminal of the neighboring unit battery, the negative electrode terminal and It is composed by connecting the conductor between the terminals of the anode via a nut.

Such secondary battery modules should be able to easily release the heat of reaction generated from each unit cell by connecting one to many dozens of unit cells, and moreover, secondary batteries applied to HEV (Hybrid Electric Vehicle) In the case of the battery module, the heat dissipation function may be the most important.

That is, the heat dissipation characteristic of the secondary battery module is a major factor that determines the performance of the battery module. When heat dissipation is not performed properly, the internal temperature of the unit battery increases due to the heat, and in the severe case, the secondary battery module is It may cause the malfunction of the applied equipment or the risk of explosion due to overheating.

In particular, in the case of the HEV secondary battery module used for vehicles, since the charge and discharge of a large current, the heat of reaction is generated by the internal reaction of the unit cell according to the use state is raised to a considerable temperature, which affects the unique characteristics of the battery The performance inherent in the secondary battery module is reduced.

In addition, the internal pressure of each unit cell is increased due to the chemical reaction therein, and thus the shape of the battery is changed, thereby adversely affecting battery performance. In particular, when the ratio of width and length is large, such as a rectangular secondary battery, the risk is further increased.

Accordingly, in the case of a secondary battery module in which a plurality of unit cells are incorporated, a partition wall is provided between the unit cells and the unit cells to secure an interval for distribution of cooling air between the unit cells, and structurally, Although the deformation is prevented, only the cooling action of the cooling air generated by the partition wall and the blowing fan provided in the conventional secondary battery module includes a problem that there is a structural limit to increase the overall cooling efficiency of the secondary battery module.

Therefore, the present invention has been invented to solve the problems caused by structural limitations of components for cooling the conventional secondary battery module, an object of the present invention is to apply a carbon fiber excellent heat transfer efficiency as a material of the components of the secondary battery module module It is to provide a secondary battery module that enables efficient temperature control and compact module configuration.

Another object of the present invention is to provide a secondary battery module which enables the module to be lightened and extends its life by applying to the internal components using the light, elastic and excellent properties of carbon fiber.

In order to achieve the above object, the secondary battery module of the present invention includes at least one battery assembly formed by stacking and arranging a plurality of unit cells, and a housing in which the battery assembly is embedded and a cooling medium for temperature control is circulated.

At least one component constituting the battery module is formed of carbon fibers.

Herein, the case of the unit battery may be formed of carbon fiber.

In addition, the present invention may be partitioned between the unit cells of the battery assembly, the partition surface may be formed of carbon fiber.

In addition, the present invention includes a battery management system circuit board (BMS, hereinafter abbreviated as BMS) that is electrically connected to the unit battery and mounts a CPU chip, and includes carbon on the CPU chip of the BMS. The fibers can be attached.

The inside of the housing may further include a thermoelectric element on one side of the suction port, the attachment position of the thermoelectric element is not limited.

The thermoelectric element is composed of a Pelier element, the carbon fiber is attached to the upper surface, the carbon fiber is preferably formed integrally with the carbon fiber hair on the opposite surface attached to the thermoelectric element.

And when the case of the unit cell is formed of carbon fiber, it is preferable that the carbon fiber hair is densely integrally formed on the outer surface of the case formed of the carbon fiber.

In this case, the case of the unit battery may be formed in a square, it may be formed in a cylindrical shape.

And the partition wall is made of a structure that forms an air passage between the two sheets, when the partition wall is formed of carbon fiber, the partition wall formed of carbon fiber is carbon fiber hair on the inner surface or the outer surface of each plate facing each other. It is preferable to form one integrally.

In addition, a carbon fiber can be attached to the CPU chip mounted on the circuit board for the battery management system as a heat conductor on the upper surface thereof, and the carbon fiber is densely integrated with the carbon fiber on the opposite surface attached to the CPU chip. It is preferably formed.

The carbon fiber is a fiber made by heating and carbonizing an organic fiber in an inert gas. The carbon fiber has excellent heat resistance and impact resistance, and has a strong advantage in chemicals. Since it is reduced, it is lighter than metal (aluminum), while it has the advantage of superior elasticity, strength, and heat transfer efficiency compared to metal (iron).

In this case, when the carbon fiber is applied to the case of the unit cell or the partition wall material, the volume of the air passage can be reduced in the secondary battery module, thereby making it possible to compact the CPU chip on the circuit board for the battery management system or the above. In addition to being applied to the thermoelectric element as a thermal conductor, the heat dissipation area by the carbon fiber hair can be extended to enable efficient temperature control of the secondary battery module, and the module can be lightened and its life can be extended.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the embodiment of the present invention, a case of using air as a cooling method of the secondary battery module will be described as an example.

1 is a side cross-sectional view schematically showing the configuration of a secondary battery module according to an embodiment of the present invention.

Referring to the schematic configuration of the secondary battery module 10 with reference to the drawings, the secondary battery module 10 according to an embodiment of the present invention, the housing 11 is formed with a space (S) therein The housing 11 includes a suction port 13 and a discharge port 15 to suck and discharge cooling air.

One side of the inlet 13 of the housing 11 is provided with a blowing fan 17 for sucking cooling air into the space S of the housing 11.

In addition, a plurality of unit cells 20 are built in the center of the space S of the housing 11. The unit cells 20 include an electrode group in which a positive electrode plate and a negative electrode plate are positioned with a separator interposed therebetween. 21) It is provided inside to produce power.

In addition, the partition wall 30 is installed between the unit cells 20 to form an air passage 31 between the case 21.

That is, the partition wall 30 is installed between each unit cell 20 to maintain the interval so that the cooling air flows between the unit cells 20 to form the air passage 31, each unit cell 20 ) To the side.

The secondary battery module 10 having such a configuration introduces cooling air for controlling the temperature of the unit battery 20 through an inlet 13 formed at an upper end of one side of the housing 11, and the opposite side thereof. The air cooled by the unit cell 20 is discharged through the discharge port 15 formed at the bottom.

That is, by the operation of the blower fan 17, the cooling air is sucked into the housing 11 through the suction port 13, and the partition wall 30 is installed between the unit cell 20 and the side surfaces of the unit cell 20. It is distributed to the lower through the air passage 31 of the cooling air in the process absorbs the reaction heat generated in the unit cell 20 is discharged through the lower outlet 15 of the housing (11).

Here, the structure of the housing 11, the positions of the inlet 13 and the outlet 15, and the arrangement of the unit cells 20 in the housing 11 are particularly limited as long as the structure is satisfied. It is not limited.

In the secondary battery module having such a configuration, 'Example 1' for the portion A of FIG. 1 illustrates that the case 21 of the unit cell 20 is made of carbon fiber.

Moreover, it is preferable that the carbon fiber hairs V are formed densely and integrally on the outer surface of the case 21 formed of the carbon fibers.

That is, the case 21 of the unit cell 20 is as described above on the outer surface in order to enlarge the heat dissipation area of the outer surface facing the air passage 31 formed between the partition wall 30. It is made of a carbon fiber material which integrally forms the carbon fiber hair (V).

FIG. 2 is a detailed perspective view illustrating a case 21 of a rectangular secondary battery applied to a secondary battery module according to an exemplary embodiment of the present invention, and illustrates a rectangular unit cell 20 applied to the secondary battery module 10 of the present invention. ) Has a long hexahedron shape vertically (in the X-axis direction of the drawing) and a carbon fiber case 21 which integrally forms the carbon fiber hair V on an outer surface thereof, with an insulating plate interposed therebetween. A rectangular electrode group formed by winding a positive electrode plate and a negative electrode plate is inserted, and the open portion of the case 21 is sealed with a cap plate 23.

At this time, the material of the cap plate 23 may also be made of a carbon fiber material.

That is, the electrode group (not shown) is interposed between the positive electrode plate and the negative electrode plate in sequence, and rolled around the transverse crimp to form a jelly roll form, and then pressed it by pressing means such as a press into a square Since many techniques are already disclosed at the level of those skilled in the art, the following description will be omitted.

The positive electrode plate and the negative electrode plate of the electrode group are electrically connected to the positive electrode terminal and the negative electrode terminal 25 and 27 provided on the cap plate 23, respectively.

In addition to this, the cap plate 23 may further include a vent part 29 to prevent explosion of the battery by breaking at a set pressure and releasing gas.

That is, the carbon fiber case 21 is to increase the contact amount of the cooling air as a heat transfer medium by the carbon fiber hair (V) on the outer surface of the carbon fiber case 21 to be able to more efficiently dissipate the reaction heat generated from the electrode group to the atmosphere. .

On the other hand, Figure 3 is a perspective view showing in detail the case 121 of the cylindrical secondary battery applied to the secondary battery module according to an embodiment of the present invention, in the secondary battery module 10, the portion A of FIG. The cylindrical unit cell 120 is exemplified by the example in which the case of the unit cell applied to 'Example 1' is cylindrical.

That is, the cylindrical unit cell 120 has a difference in the shape of the case 121 compared to the rectangular unit cell 20, but the carbon fiber (V) and the carbon fiber of the outer surface of the case 121 as a material In the same manner, the cylindrical electrode group formed by winding the positive electrode plate and the negative electrode plate with the separator, which is an insulating material, is inserted therebetween, and the open portion of the cylindrical case 121 is sealed with the cap assembly 123. The basic construction principle of one form is the same.

That is, the outer circumferential surface area of the cylindrical case 121 is increased by the carbon fiber hair, thereby expanding the contact area between the case 121 and the cooling air, thereby more efficiently dissipating the reaction heat generated from the electrode group into the air. The effect which can be made is the same as that of a square secondary battery.

In the secondary battery module 10 having the above-described configuration, 'Example 2' for the portion A of FIG. 1 illustrates that the partition wall 30 between the unit cells 20 is made of carbon fiber, 4 illustrates a partial cutaway perspective view of the partition wall 30 applied to the secondary battery module 10.

The partition wall 30 according to Example 2 forms an air passage 31 between two sheet members, and the partition wall 30 is formed of carbon fiber.

The partition wall 30 formed of such carbon fibers is preferably formed with a densely integrated carbon fiber hair (V) on the inner surface of each carbon fiber plate facing each other.

That is, the partition wall 30 applied to the secondary battery module 10 of the present invention as shown in FIG. 4 has a structure for interposing between the rectangular unit cells 20, and faces the air passage 31. Consists of two sheets of carbon fiber material forming the carbon fiber hair (V) integrally on the side, the partition wall 30 according to the above configuration is to the carbon fiber hair (V) on the opposite inner surface As a result, the amount of contact with the cooling air, which is a heat transfer medium, is increased, so that the heat of reaction generated from the electrode group can be received from the case 21 of the unit cell 20 and more efficiently radiate to the atmosphere.

In addition, the secondary battery module 10 having the above-described configuration is located on the unit cell 20 and electrically connected to each unit cell 20 to provide overdischarge, overcharge, overcurrent, and excessive input of each unit cell 20. And a separate battery management board (BMS) for limiting input or output current to prevent overheating, which is installed on the circuit board 41. The CPU chip 43 is mounted.

Here, in Example 3 of part B of FIG. 1, a thermoelectric is applied to an upper surface of the CPU chip 43 to increase the cooling efficiency of the CPU chip 43 mounted on the circuit board 41 for the battery management system. Attaching carbon fiber to the conductor 45 is illustrated.

At this time, the carbon fibers attached to the CPU chip 43 by the thermal conductor 45 have carbon fiber hairs V on opposite surfaces attached to the CPU chip 43 as shown in FIG. 5. It is preferable to form one integrally.

That is, as shown in Figure 5, the CPU chip 43 mounted on the circuit board 41 for the battery management system to be applied to the secondary battery module 10 of the present invention is a carbon fiber that is the thermal conductor 45 And by the carbon fiber hair (V) the amount of contact with the cooling air which is a heat transfer medium is increased it is possible to more efficiently dissipate heat by self-heating to the atmosphere.

On the other hand, the secondary battery module 10 according to an embodiment of the present invention further includes a thermoelectric element 51 on one side of the inlet 13 of the housing 11 to further increase the heat dissipation efficiency of the secondary battery module 10. You can do that.

Here, 'Example 4' for the portion C of FIG. 1 illustrates that carbon fibers are attached to the upper surface of the thermoelectric element 51 by the thermal conductor 53 so as to increase the cooling efficiency of the thermoelectric element 51. have.

At this time, the thermoelectric element 51 is preferably made of a Peltier element.

In other words, the Peltier element is a phenomenon in which heat is absorbed or generated depending on the current, that is, the Peltier effect is a Peltier effect. The terminal is endothermic, and the other terminal is defined as a phenomenon of generating heat.

As shown in FIG. 6, carbon fiber hair V is tightly integrated on the opposite surface attached to the thermoelectric element 51 to the carbon fiber attached to the thermoelectric element 51 on the thermoelectric element 51. It is preferable to form.

That is, as shown in Figure 6, the thermoelectric element 51 applied to the secondary battery module 10 of the present invention is cooled as a heat transfer medium by the carbon conductor and carbon fiber hair (V) of the heat conductor 53 As the amount of contact with air is increased, the endothermic or exothermic properties can be increased to increase the efficiency of heat exchange with the atmosphere.

The secondary battery module 10 of the present invention can be effectively used as a battery for HEV requiring high output and large capacity, but its use is not necessarily limited to HEV.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, according to the present embodiment, by applying carbon fiber having excellent heat transfer efficiency as a material of the internal battery module components, efficient temperature control of the module is possible, and compact module configuration is possible.

In addition, the light weight, elasticity and strength of the carbon fiber makes it possible to lighten the internal components of the secondary battery module to reduce the weight of the entire secondary battery module, and to prevent deformation of each unit battery, thereby extending its lifespan. The heat exchange efficiency is increased to reduce the size of the blower fan.

Claims (17)

It comprises a housing having a suction port and an outlet for forming a space therein and the cooling medium flows, and a plurality of unit cells embedded in the space of the housing, The secondary battery module of the carbon medium is the partition wall installed between the case or cap plate or the unit cell of the unit cell is a heat transfer and the cooling medium. The secondary battery module of claim 1, further comprising a thermoelectric element at one side of a suction port of the housing. The secondary battery module of claim 2, wherein the thermoelectric element has a carbon fiber attached to an upper surface thereof. The secondary battery module of claim 3, wherein the carbon fibers are densely integrally formed with carbon fiber hairs on opposite surfaces attached to the thermoelectric elements. The secondary battery module of claim 2, wherein the thermoelectric element is formed of a pellier element. delete The secondary battery module of claim 1, wherein carbon fiber hairs are densely formed on an outer surface of the case formed of the carbon fibers. The secondary battery module of claim 1, wherein the case of the unit battery is a rectangular shape. The secondary battery module of claim 1, wherein the case of the unit cell has a cylindrical shape. delete delete The secondary battery module of claim 1, wherein the barrier rib formed of the carbon fiber is formed of a densely integrated carbon fiber hair on an inner surface through which a cooling medium flows. The secondary battery module according to claim 1 or 12, wherein the barrier rib formed of the carbon fiber is formed of a densely integrated carbon fiber hair on an outer surface of the barrier rib formed of the carbon fiber. The CPU chip of claim 1, further comprising a circuit board for a battery management system electrically connected to the unit battery and for mounting a CPU chip, wherein the CPU chip mounted on the circuit board for the battery management system includes carbon fiber on an upper surface thereof. Attached secondary battery module. 15. The secondary battery module of claim 14, wherein the carbon fibers are densely formed integrally with the carbon fiber on the opposite surface attached to the CPU chip. The secondary battery module of claim 1, wherein the battery module is for driving a motor. A housing having a space therein and having an inlet and an outlet, a blower fan disposed at one side of the inlet of the housing to suck cooling air into the space of the housing, and a plurality of unit cells embedded in the space of the housing And a partition wall disposed between the unit cells, and positioned on the unit cell and electrically connected to each unit cell, and attached to a circuit board for a battery management system for mounting a CPU chip and an inlet of the housing. Including thermoelectric elements, A secondary battery module formed by applying carbon fiber to at least one component of a CPU chip or a thermoelectric element on a case or a partition of a unit cell or a circuit board for a battery management system, as a thermal conductor.

Images