1]The present invention relates to a heat radiating structure of a cylindrical battery cell for reducing, more specifically to the heating problem occurring in the battery cell discharge related to a heat radiation structure of the cylindrical battery cell.
BACKGROUND
[2]Lithium ion batteries are widely according to the type divided into cylindrical, prismatic, polymer. Here, the cylindrical battery has a characteristic of high-capacity, high-power battery is formed as a cylindrical shape. Thus, the cylindrical batteries are used in the products and areas that usually require a lot of power. For example, it can be applied to power tools which momentarily demands a large force, the electric vehicle, electric bicycles.
[3]
On the other hand, cylindrical batteries, and it is generally configured plurality of cylindrical battery cells. The step of electrically connecting a plurality of battery cells is required to manufacture a cylindrical battery. Thus, methods for electrically connecting a plurality of battery cells are generally made of an upper part of the cell and the nickel plate in a manner that the resistance welding. That is, for example, to a part of the nickel plate having a strip shape is connected to the upper portion of the battery cell, and the other end portion is electrically connected to the battery cell by welding connections with nickel plates are connected to the other battery cells.
[4]
However, when using such a method, since the upper portion and the portion where the nickel plates are connected to the battery cell is a portion, which had a structure in which the contact area of ​​the current moving to the nickel plate on the battery cells to form only a part. Here, the nickel plate has a limit of the nature of electrically conductive materials.
[5]
Accordingly, when discharge in the structure as described above at a high current of the battery cell, due to the limitations of the battery cell and the electric conductivity of the nickel surface area and nickel plates to the contact areas of the current of the plate move as a high current move to nickel plate the nickel is a lot of heat is generated in the plate and the battery cell.
Detailed Description of the Invention
SUMMARY
[6]
The invention to the cylindrical battery having the above structure, if the battery cell is discharged at a high current, in order to solve the heating problem of the battery cell and a nickel plate.
Problem solving means
[7]
Heat dissipation structure of a cylindrical battery cell according to an embodiment of the present invention, in contact with the upper portion of the battery cell, the first plate for the current to the discharge of the battery cell; But disposed between the first plate and the battery cell, the second plate is arranged so as not to contact with the battery cell; The second is provided between the second plate and the battery cell, a heat transfer unit to contact with the battery cell transfer heat generated from the battery cells to the second plate; And the configuration including the second plate is characterized in that which is in contact with the area that is not in contact with the battery cell discharge current discharged from the first plate further from the first plate.
[8]
On the other hand, the second plate is characterized by consisting of a higher electrical conductivity than the first plate material.
[9]
Here, the first plate is further characterized in that consisting of nickel. In addition, the second plate is further characterized in that consisting of copper.
[10]
On the other hand, the heat transfer unit, characterized by consisting of a thermal interface material (TIM).
[11]
The heat radiating system of the cylindrical battery cell according to an embodiment of the invention, a current measuring unit for measuring a current of the battery cell; If current of the battery cell measured by the current measuring unit is greater than a predetermined value, a control unit for controlling so that the current discharge of the battery cell; A first plate in contact with the upper portion of the battery cell, which is the current of the battery cell discharge under control of the controller; First, but located between the battery cells and the first plate being disposed so as not to contact is with the battery cell, in contact with the area that is not in contact with the battery cell discharge additionally the current discharged from the first plate in the first plate the second plate; The second peulrel this is provided between the bit and the battery cell, a heat transfer unit to transfer heat generated in the battery cell in contact with the battery cells to the second plate; It is configured to include a.
[12]
On the other hand, the second plate is characterized by consisting of a higher electrical conductivity than the first plate material. Here, the first plate is further characterized in that consisting of nickel. In addition, the second plate is further characterized in that consisting of copper.
[13]
On the other hand, the heat transfer unit, characterized by consisting of a thermal interface material (TIM).
Effects of the Invention
[14]
The present invention can be in the structure of a cylindrical battery, the electrical conductivity is reduced, the heating amount of the plate due to improved electrical conductivity by dispersing an effective current during discharging of the battery cell by constructing a plurality of other plates.
[15]
In addition, it has a heat radiating effect of reducing the temperature of the cell, by configuring the heat transfer material between the battery cell and the plate to transfer heat generated in the cell to the plate.
Brief Description of the Drawings
[16]
1 is a front view of an electrical connection structure of a conventional battery cell.
[17]
2 is a front view of the heat dissipation structure of the battery cell in accordance with the present invention.
[18]
Figure 3 is a partial enlarged view of Figure 2;
Mode for the Invention
[19]
In the following a description will be given of an embodiment of the present invention will be fully self-of ordinary skill to be easily carried out in the pertaining the present invention with reference to the accompanying drawings art. However, the invention is not to be implemented in many different forms and limited to the embodiments set forth herein. And the part not related to the description in order to clearly describe the present invention in the figures was in nature and not restrictive. Like reference numerals designate like elements throughout the specification.
[20]
First and although the term includes the ordinal number such as 2, can be used in describing various elements, but the above elements shall not be restricted to the above terms. These terms are only used to distinguish one element from the other. For example, without departing from the scope of the present invention, the first component may be referred to as a second configuration can be named as an element, similar to the first component is also a second component. The terms used in the present specification are merely used to describe particular embodiments, and are not intended to limit the present invention. Expression in the singular number include a plural forms unless the context clearly indicates otherwise.
[21]
In the specification, when there is any part is "connected" with another part, which is also included if it is the case that is "directly connected to", as well as with the other element or intervening "electrically coupled to". In addition, it is assuming that any part "includes" another component, which is not to exclude other components not specifically described against which means that it is possible to further include other components.
[22]
The term of degree are used throughout the present specification, "(a) through step" or "step-in" does not mean "step for".
[23]
As used in the present invention include, but selects general terms that are considered while possible now widely used functions of the present invention, which may vary depending on the appearance of the technicians intention or precedent, new technologies to engage in the art. Furthermore, the particular case will be the applicant and also randomly selected term, described in detail in the description of the meaning of the invention applicable in this case. Therefore, the terms used in the present invention is not entitled simpler terms, to be defined on the basis of information over a wide meaning of the present invention the term is having.
[24]
With reference to the drawings in detail to illustrate the invention.
[25]
1 is a diagram briefly showing the connection structure between the battery cell when the conventional battery pack is manufactured.
[26]
Referring to FIG 1, a plurality of methods for electrically connecting the battery cell 10, the upper portion of the battery cell 10 (A) and the nickel plate 20 for making the conventional cylindrical battery pack It was done by resistance welding.
[27]
In the cylindrical battery pack having a structure connected in this way, if the current in the battery cells or more predetermined reference value is so controlled that the current of the battery cell discharge. At this time, it is the current of the battery cell discharge, is the current of the battery cell 10 is moved to the nickel plate 20 through the upper portion of the battery cell and the battery cell contacting the nickel plate (A). That is, when the battery cell discharge, the current in the battery cells will be moved to the nickel plate 20 is discharged from the nickel plate 20.
[28]
However, when the battery cell is discharged at a high current the nickel plate 20, so the limit of the nature of electrically conductive material, a corresponding current is moved to the nickel plate 20, so that the nickel plate 20 is battery the large amount of heat is generated by the current to be moved from the cell 10. Further, the area (A) to the current of the battery cell 10 is moved to the nickel plate 20, as shown in Figure 1 has a limitation in the transfer of electrical current, so only a portion of the battery cell. Accordingly, it is the case that the battery cell is discharged, the battery cells also much heat by the electric current could not move smoothly to the nickel plate 20 in the battery cell 10 through the area A to the high current generation. Heating problem of such a battery cell and a nickel plate may cause various problems, such as damaging the battery cells.
[29]
Accordingly, the present invention proposes a heat radiation structure of a cylindrical battery cell for solving the heat generation problem of the battery cell and the nickel plate that occur in the structure of a conventional cylindrical battery as described above.
[30]
2 is a front view of the heat dissipation structure of a cylindrical battery cell according to the present invention.
[31]
2, the can in order to design a heat radiation structure of a cylindrical battery cell may be configured to include a battery cell 100, first plate 200, second plate 300, a heat transfer unit (400) .
[32]
As Bao shown in the figure, one portion of the first plate 200 is connected to the upper portion of the battery cell (F). Accordingly, when the battery cell is discharged, the current in the battery cells is moved to the first plate 200 through the area (F) of the battery cell 100 and the first plate 200 is in contact, moving the current It is discharged from the first plate (200).
[33]
That is, the region 'F' of the battery cell 100 and the first peulrel the bit 200 is in contact, the current of the battery cell to which the movement area to move to the first plate 200. The Accordingly, the current of the battery cell 100 is discharged, the current of the battery cell from the first plate by moving the first plate (200).
[34]
Here, the first plate 100 may have an example strip shaped, for example.
[35]
On the other hand, as shown in the figure, the second plate 300, but is positioned between the battery cell 100 and the first plate 200 and is arranged so as not to contact the battery and the cell. In other words, it disposed between the second plate (300) portion and a battery cell of the first plate than the movement area (F) of the current of the battery cell to a first plate (200).
[36]
In the second plate 300 disposed in this manner, it is the first cell of the battery current is discharged from the plate 200 can be further discharged.
[37]
By this, such as with reference to Figure 3 an enlarged heat-radiating structure to explain the principles, the battery cells discharged at a high discharge rate, and current of the battery cells is moved to the first plate 200 through a transition area (F), first the current of the battery cell to move to the plate 200 to move to the second plate (300). That is, the invention by the current of the battery cell to a single plate unlike the conventional way in which the current of the battery cell discharge in the one plate is a structure in which the discharge current of the battery cell balancing in the two plates.
[38]
Therefore, when a discharged battery cell at a high current, the flow of the current of the battery cell is discharged primarily from the first plate 200, it is discharged to go to the additional second plate (300).
[39]
In this way it is possible to ensure by the current of the battery cell discharge in the two plates, reduce the heating value of the resulting plate from which the current is discharged in a single plate.
[40]
The second plate 300 is composed of a material with high electrical conductivity than the first plate (200). For example, the first plate 200 may be composed of nickel (Ni) may be configured as the second plate 300 is copper (Cu) to have an electrical conductivity higher than that of nickel.
[41]
On the other hand, the heat transfer part 400, is provided between the second plate 300 and the battery cell 100, and transfer heat generated in the battery cell in contact with the battery cells to the second plate 300 a block which.
[42]
The heat transfer unit 400, wrapped by transferring heat generated from the battery cells when the battery cells discharged at the second plate can have lowered the temperature of the battery cell. The second plate 300 may have heat conductivity than the heat effectively the heat generated from the battery cell transmitted through the heat transfer unit 400, so a high substance, for example composed of copper (Cu).
[43]
Therefore, high if the current discharged by the, if the heat generated from the battery cells by the first fails to smoothly move to the plate 200, current from the battery cell 100 through the transition area (F), the heat transfer unit ( by 400) is such that heat radiation by passing the heat to the second plate 300 may reduce the heat generation phenomenon in the battery cell.
[44]
Where comprises the heat transfer unit 400 it is, for example, consists of a heat-conducting / emitting material (Thermal Interface Material), thermal grease, heat-radiating sheet, a radiating pad and a thermally conductive adhesive, PCM (phase change material), etc. and it may be configured.
[45]
It will be described in the heat-radiating system of the cylindrical battery cell, applying a heat radiating structure of Figure 2 described above.
[46]
Cylindrical battery pack is designed to apply a heat radiating structure of the present invention includes a battery cell 100, first plate 200, second plate 300, a heat transfer unit 400, current measurement section 500 and the control unit (600 ) it can comprise.
[47]
A current measuring unit (500) is configured to measure the current of the battery cell.
[48]
On the other hand, the control section 600, a current of the battery cell measured by the current measuring unit 500 is a configuration for controlling so that the current is discharged when a predetermined value or more, the battery cells 100.
[49]
The control unit 600, to the battery cell to perform the overcharge or over-discharge role. That is, the controller 600 may be described in the configuration, such as a protection circuit.
[50]
When controlled so that the battery cells are discharged by the controller 600, the current of the battery cell 100 may be taken to the first plate 200 through the area (F) of the battery cells and the first plate 200 is in contact do. Further, the current of the battery cell is discharged to go to the first plate 200 is moved to the second plate 300. Accordingly, it would in the second plate 300 that is the first current discharged from the first plate 200 is further discharged.
[51]
That is, it can be said to be moving, the current of the battery cell when the battery cell discharge in the first plate 200 to the second plate 300, and is dispersed in the two plates 200 and 300 discharge.
[52]
The second plate 300 is provided with the electrical conductivity than the first plate 200 is composed of high material. For example, the first plate 200 is composed of nickel (Ni), the may be of a second plate 300 is copper (Cu).
[53]
On the other hand, the heat transfer part 400 provided between the battery cell 100 and the second plate 300 transfers the heat generated from the battery cells to the second plate.
[54]
Since the current of the battery cells move through the partial area (F) of the battery cells and the first plate 200 is in contact, when a discharged battery cell at a high current through the mobile region (F) from the battery cell 100, the If one fails to move smoothly to the current plate 200, the heat can cause the battery cell by the electric current. Thus, the temperature of the battery cells by transferring the heat generated from the battery cell case as described above by configuring the heat transfer portion 400 between the battery cell 100 and the second plate 300 to the second plate 300 It can give lower.
[55]
At this time, the second plate 300 is capable of radiating heat from the battery cells that are transferred from the heat transfer part 400, so an example in which the electric conductivity is high material g., Composed of copper (Cu), as described above will be.
[56]
Where comprises the heat transfer unit 400 it is, for example, consists of a heat-conducting / emitting material (Thermal Interface Material), thermal grease, heat-radiating sheet, a radiating pad and a thermally conductive adhesive, PCM (phase change material), etc. and it may be configured.
[57]
On the other hand, although the technical concept of the present invention is specifically described according to the embodiment, the embodiment is for the description, it should be noted that not for the limitation. Further, in the art One skilled in the art will understand the various embodiments are possible examples within the scope of the technical idea of ​​the present invention.

Claims

[Claim 1]In the heat dissipation structure of a cylindrical battery cell, in contact with the upper portion of the battery cell, the first plate for the current to the discharge of the battery cell; But disposed between the first plate and the battery cell, the second plate is arranged so as not to contact with the battery cell; The second is provided between the second plate and the battery cell, a heat transfer unit to contact with the battery cell transfer heat generated from the battery cells to the second plate; Is configured to include a, the second plate, the heat dissipation structure of the battery cells being in contact with the area that is not in contact with the battery cell discharge current discharged from the first plate further from the first plate.
[Claim 2]
The method according to claim 1, wherein the second plate, the heat dissipation structure of the battery cell, characterized in that consisting of a higher electrical conductivity than the first plate material.
[Claim 3]
The method according to claim 2, wherein the first plate, the heat dissipation structure of the battery cell, characterized in that consisting of nickel.
[Claim 4]
The method according to claim 2, the heat dissipation structure of the battery cell, characterized in that the second plate is composed of copper.
[Claim 5]
The method according to claim 1, heat dissipation structure of the battery cell, characterized in that consisting of the heat transfer portion, the heat transfer material (TIM).
[Claim 6]
In the radiation system of the cylindrical battery cell, a current measuring unit for measuring a current of the battery cell; If current of the battery cell measured by the current measuring unit is greater than a predetermined value, a control unit for controlling so that the current discharge of the battery cell; A first plate in contact with the upper portion of the battery cell, which is the current of the battery cell discharge under control of the controller; First, but located between the battery cells and the first plate being disposed so as not to contact is with the battery cell, in contact with the area that is not in contact with the battery cell is further discharge current discharged from the first plate in the first plate the second plate; The second is provided between the second plate and the battery cell, a heat transfer unit to contact with the battery cell transfer heat generated from the battery cells to the second plate; Heat dissipation system of the battery cell is configured to include a.
[Claim 7]
The method according to claim 6, wherein the second peulrel the teuneun, heat dissipation system of the battery cell, characterized in that consisting of the first to have an electrical conductivity higher than the first plate material.
[Claim 8]
The system according to claim 7, wherein the first plate, the heat dissipation system of the battery cell, characterized in that consisting of nickel.
[Claim 9]
The method according to claim 7, the heat-radiating system of the battery cell, characterized in that the second plate is composed of copper.
[Claim 10]
The method according to claim 6, the heat-radiating system of the battery cell, characterized in that consisting of the heat transfer portion, the heat transfer material (TIM).