CN222380668U - Battery cell, battery pack and vehicle - Google Patents
Battery cell, battery pack and vehicle Download PDFInfo
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- CN222380668U CN222380668U CN202420730185.0U CN202420730185U CN222380668U CN 222380668 U CN222380668 U CN 222380668U CN 202420730185 U CN202420730185 U CN 202420730185U CN 222380668 U CN222380668 U CN 222380668U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a battery cell, a battery pack and a vehicle, which relate to the field of automobile batteries, wherein the battery cell comprises a shell, a cover plate, a pole core, a pole post and heat-conducting glue, the pole core is arranged in the shell, the end part of the pole core, which is close to the cover plate, is provided with a pole lug, one end of the pole penetrates through the cover plate to be connected with the pole lug, and a gap between the pole core and the cover plate is filled with heat-conducting glue, and the heat-conducting glue is contacted with the pole and/or the pole lug and is contacted with the cover plate and/or the shell. Through the tip that is close to the apron at the pole core, that is, the pole core is equipped with the pole ear, with casing, the clearance department packing heat conduction glue between the apron, the electric core in the course of the work, the heat that its pole ear and/or utmost point post produced can be more quick through the heat conduction glue to casing and/or apron, until external environment, improve the radiating effect of electric core along length direction's tip, electric core whole difference in temperature is littleer, is favorable to improving the performance of electric core, prolongs the life of electric core.
Description
Technical Field
The utility model relates to the field of automobile batteries, in particular to an electric core, a battery pack and a vehicle.
Background
Along with the improvement of the requirement of users on the whole vehicle charging time, the charging odds are larger and even reach 5 ℃, so that the battery core faces the problem of overhigh highest temperature in the charging process, one end or two ends of the battery core along the length direction are provided with pole lugs, according to actual measurement data, the end part of the battery core in the length direction, namely the highest temperature near the pole lugs, is over 70 ℃ in the charging process, the temperature difference between the battery core and other positions inside the battery core is close to 20 ℃, the temperature distribution is extremely uneven, and the performance and the service life of the battery core are seriously influenced.
Disclosure of utility model
The utility model aims to solve the technical problem that the service life of the battery cell is influenced by overhigh temperature at two ends of the existing battery cell along the length direction.
In a first aspect, the utility model provides a battery cell, which comprises a shell, a cover plate, a pole core, a pole post and heat-conducting glue, wherein the pole core is arranged in the shell, a pole lug is arranged at the end part of the pole core, which is close to the cover plate, one end of the pole post penetrates through the cover plate to be connected with the pole lug, a gap between the pole core and the cover plate is filled with the heat-conducting glue, and the heat-conducting glue is in contact with the pole post and/or the pole lug and is in contact with the cover plate and/or the shell.
Optionally, the battery cell further comprises an isolation cover, the isolation cover is arranged on one side, close to the cover plate, of the pole core, and the heat conducting glue is filled between the isolation cover and the cover plate.
Optionally, the isolation cover is provided with a containing cavity with an opening facing one side of the cover plate, the containing cavity is filled with the heat conducting glue, and the cover plate is connected with the isolation cover and contacted with the heat conducting glue.
Optionally, the cover plate is provided with a glue injection hole, and the glue injection hole is communicated with the accommodating cavity.
Optionally, a through hole is formed in the bottom of the accommodating cavity, a conductive block is arranged at one end of the pole extending into the cover plate, and the pole lug penetrates through the through hole to be connected with the conductive block.
Optionally, one end of the tab passes through the through hole and then is bent to form a flanging, and the flanging is in fit connection with the conductive block.
Optionally, two ends of the shell along the length direction are respectively provided with an opening, and the two cover plates are respectively covered at the corresponding openings.
Compared with the prior art, the battery cell has at least the following advantages:
Through filling the heat conduction glue in clearance department between utmost point core and apron, the heat conduction glue can be full of the whole clearance between utmost point core and the apron, also can not be full of whole clearance, that is, heat conduction glue and utmost point post and/or utmost point ear contact, and with apron and/or casing contact, the electric core is in the course of the work, the heat that its utmost point ear and/or utmost point post produced can more quickly transfer casing and/or apron through the heat conduction glue, until external environment, improve the radiating effect of electric core along the tip of length direction, the whole difference in temperature of electric core is littleer, be favorable to improving the performance of electric core, the life of extension electric core. Meanwhile, the heat-conducting glue has good fluidity, can be better filled at the end part of the pole core, and further ensures the heat dissipation effect.
In a second aspect, the present utility model provides a battery pack including the above-mentioned battery cell.
According to the battery pack, the heat conducting glue is filled in the gaps between the two ends of the pole core of the battery core and the shell and the cover plate, and in the working process of the battery core, heat generated by the pole lugs and the pole posts at the two ends of the battery core can be more rapidly transferred to the shell and the cover plate to the external environment through the heat conducting glue, so that the heat dissipation effect at the two ends of the battery core is improved, the overall temperature difference of the battery core is smaller, the performance of the battery core and the battery pack is improved, and the service lives of the battery core and the battery pack are prolonged.
Optionally, the battery pack further comprises a liquid cooling plate, wherein the liquid cooling plate is contacted with one side surface of the shell of the battery cell, and the heat conducting glue is arranged close to the side surface of the shell contacted with the liquid cooling plate.
In a third aspect, the present utility model provides a vehicle comprising the battery pack described above.
According to the vehicle, the heat conducting glue is filled in the gaps between the two ends of the electrode core of the battery pack and the shell and the cover plate, and in the working process of the battery pack, heat generated by the electrode lugs and the electrode posts at the two ends of the battery core can be more rapidly transferred to the shell and the cover plate to the external environment through the heat conducting glue, so that the heat dissipation effect at the two ends of the battery core is improved, the overall temperature difference of the battery core is smaller, the performance of the battery core and the battery pack is improved, and the service lives of the battery core and the battery pack are prolonged.
Drawings
FIG. 1 is a schematic diagram of a cell according to an embodiment of the present utility model;
fig. 2 is an exploded view of a battery cell according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a liquid cooling plate according to an embodiment of the present utility model disposed at the bottom of a battery cell;
Fig. 4 is a schematic structural diagram of a liquid cooling plate disposed at the front of a battery cell according to an embodiment of the present utility model.
Reference numerals illustrate:
1. The solar cell comprises a shell, a cover plate, 21, a glue injection hole, 3, a pole core, 31, a pole lug, 311, a flanging, 4, a pole post, 41, a conductive block, 5, heat conducting glue, 6, an isolation cover, 61, a containing cavity, 62, a through hole and 7, and a liquid cooling plate.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "coupled," and "mated" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, or may be directly connected, or may be indirectly connected through an intermediate medium, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
In addition, in the description of the present utility model, it should be noted that terms such as "upper", "lower", "front", "rear", etc. in the embodiments indicate terms of orientation, and only for simplifying the positional relationship of the description based on the drawings of the specification, it does not represent that the elements and devices etc. referred to must be operated according to the operations and methods and configurations defined in the specific orientation and limitation of the present utility model, and such orientation terms do not constitute limitations of the present utility model.
Herein, an XYZ coordinate system is established in which an X axis indicates a front-back direction, a positive direction of the X axis indicates a front direction, a reverse direction of the X axis indicates a rear direction, a Y axis indicates a left-right direction, a positive direction of the Y axis indicates a left direction, a reverse direction of the Y axis indicates a right direction, a Z axis indicates an up-down direction, a positive direction of the Z axis indicates an upper direction, and a negative direction of the Z axis indicates a lower direction. And it should be noted that the foregoing X-axis, Y-axis, and Z-axis are meant to be illustrative only and not indicative or implying that the apparatus or component in question must be oriented, configured or operated in a particular orientation, and therefore should not be construed as limiting the utility model.
As shown in fig. 1-2, an electrical core according to an embodiment of the present utility model includes a housing 1, a cover plate 2, a pole core 3, a pole post 4 and a heat conductive adhesive 5, where the pole core 3 is disposed in the housing 1, a pole ear 31 is disposed at an end of the pole core 3 near the cover plate 2, one end of the pole post 4 passes through the cover plate 2 to be connected with the pole ear 31, a gap between the pole core 3 and the cover plate 2 is filled with the heat conductive adhesive 5, and the heat conductive adhesive 5 contacts with the pole post 4 and/or the pole ear 31 and contacts with the cover plate 2 and/or the housing 1.
Specifically, casing 1 adopts the aluminum hull, and is the cuboid structure, the length direction of casing 1 is the extending direction of casing 1 promptly, and the direction is shown to the Y axle promptly, and casing 1 is equipped with the rectangle along the one end or the both ends of the direction that the Y axle shows, and apron 2 is the rectangle in the projection of XZ plane, and the apron 2 lid is located corresponding uncovered department, and apron 2 and casing 1 realize dismantling through joint or spiro union etc. mode and are connected, make things convenient for the installation of pole piece 3.
The electrode core 3 is a cuboid extending along the direction shown by the Y axis and is matched with the shape of the shell 1, the electrode core 3 comprises an anode material, a cathode material, electrolyte and a diaphragm, the anode material, the diaphragm and the cathode material are sequentially stacked to form a stacked structure, then the electrolyte is injected between the anode material and the cathode material, and finally the anode material and the diaphragm are tightly packaged together to form the electrode core.
The cover plate 2 is provided with a mounting hole, the pole 4 passes through the mounting hole and is welded and fixed with the pole lug 31, and the pole 4 is also welded and fixed with the cover plate 2. The heat-conducting glue 5 is liquid or semi-solid at the beginning of injection, has better fluidity, can become solid at high temperature, and is filled at the two ends of the battery cell.
The heat-conducting glue 5 contacts with the pole 4 and/or the tab 31 and contacts with the cover plate 2 and/or the housing 1, including various situations, such as the contact of the heat-conducting glue 5 with the pole 4 and the cover plate 2, or the contact of the heat-conducting glue 5 with the pole 4 and the housing 1, or the contact of the heat-conducting glue 5 with the pole 4, the tab 31 and the cover plate 2, etc., which are not listed, that is, the heat-conducting glue 5 may completely fill the gap between the pole core 3 and the cover plate 2, or may not fill the gap between the pole core 3 and the cover plate 2.
In this embodiment, the pole core 3 exchanges electric energy with the outside through the pole lugs 31 and the pole posts 4, and completes the charging and discharging process. Through filling the heat conduction glue 5 in the clearance department between the tip of pole piece 3 along length direction and corresponding apron 2, heat conduction glue 5 and pole piece 4 and/or utmost point ear 31 contact, and with apron 2 and/or casing 1 contact, the electric core is in the course of the work, the heat that its pole ear 31 and/or pole piece 4 produced can more quickly transfer casing 1 and/or apron 2 through heat conduction glue 5 until external environment, improve the radiating effect of electric core along length direction's tip, the whole difference in temperature of electric core is littleer, be favorable to improving the performance of electric core, the life of extension electric core. Meanwhile, the heat-conducting glue 5 is good in fluidity, and can be better filled at the two ends of the pole core, so that the heat dissipation effect is further ensured.
In one embodiment, the two ends of the casing 1 along the length direction are provided with openings, two cover plates 2 are covered at the corresponding openings, two ends of the pole core 3 are respectively provided with pole lugs 31, the pole posts 4 are arranged in one-to-one correspondence with the pole lugs 31, one end of each pole post 4 penetrates through the corresponding cover plate 2 to be connected with the pole lug 31, and a gap between the pole core 3 and the corresponding cover plate 2 is filled with the heat conducting glue 5. So as to realize heat dissipation of the battery cells with the tabs 31 arranged at the two ends.
As shown in fig. 1-2, the battery cell optionally further comprises an isolation cover 6, the isolation cover 6 is arranged on one side of the pole core 3 close to the cover plate 2, and the heat-conducting glue 5 is filled between the isolation cover 6 and the cover plate 2.
In this embodiment, the isolation cover 6 is made of a corrosion-resistant material, and in the working process of the battery cell, the electrolyte leakage problem may occur, so as to avoid the electrolyte leakage corrosion of the heat-conducting glue 5, and influence the heat dissipation effect, and the isolation cover 6 is arranged between the two ends of the pole core 3 and the corresponding cover plate 2, so that the electrolyte is isolated by using the isolation cover 6, and the heat dissipation effect is ensured.
As shown in fig. 2, optionally, the isolation cover 6 is provided with a containing cavity 61 opened towards one side of the cover plate 2, the containing cavity 61 is filled with the heat-conducting glue 5, and the cover plate 2 is connected with the isolation cover 6 and is in contact with the heat-conducting glue 5.
Specifically, the isolation cover 6 includes a bottom plate and a plurality of side plates, each side plate is connected in turn to form an annular structure, one end of the annular structure is connected with the bottom plate to enclose a containing cavity 61 with an opening facing one side of the cover plate 2, the circumferential edge of the cover plate 2 can extend to one side close to the isolation cover 6 to form a connecting portion, and the connecting portion is inserted into the containing cavity to realize assembly between the cover plate 2 and the isolation cover 6. The side plates of the shielding cover 6 are in contact with the inner wall of the housing 1.
In this embodiment, the opening of the isolation cover 6 not only can be matched with the cover plate 2 to form a sealed accommodating cavity for filling the heat-conducting glue 5, but also can be matched with the cover plate 2 in a plugging manner, so that the two components can be simply and conveniently assembled. The cover plate 2 is in direct contact with the heat conducting glue 5, and heat absorbed by the heat conducting glue 5 is directly transferred to the external environment through the cover plate 2, so that heat dissipation is faster.
In other embodiments, the shielding cover 6 may be a flat plate parallel to the XZ plane, and the upper and lower ends of the flat plate are respectively connected to the housing, and the flat plate, the housing and the partition board enclose an accommodating space to accommodate the heat-conducting glue 5.
As shown in fig. 2-4, optionally, the cover plate 2 is provided with a glue injection hole 21, and the glue injection hole 21 is communicated with the accommodating cavity 61.
Specifically, the glue injection holes 21 can be any shape such as round holes and square holes, one or more glue injection holes 21 can be arranged, the glue injection holes 21 are plugged by plugging, the plugging is opened after the cover plate 2 and the isolation cover 6 are assembled, glue is injected into the accommodating cavity 61 through the glue injection holes 21, and when glue injection is not needed, the glue injection holes 21 are plugged, so that impurities and dust are prevented from entering.
In other embodiments, the cover plate 2 may be assembled after the heat-conducting glue 5 is filled in the accommodating cavity of the isolation cover 6.
As shown in fig. 2, optionally, a through hole 62 is provided at the bottom of the accommodating cavity 61, a conductive block 41 is provided at an end of the pole 4 extending into the cover plate 2, and the tab 31 passes through the through hole 62 to be connected with the conductive block 41.
Specifically, the through hole 62 is a strip hole matching with the shape of the tab 31. One end of the pole 4 is located on the inner side of the cover plate 2 to be connected with the lug 31 in the accommodating cavity 61, the other end of the pole 4 extends out of the mounting hole on the cover plate 2, and the pole 4 is in rivet connection and/or welded fixation with the cover plate.
As shown in fig. 2, optionally, one end of the tab 31 passes through the through hole 62 and is bent to form a flange 311, and the flange 311 is attached to the conductive block 41.
Specifically, the tab 31 is in a sheet shape extending along the Y direction, the cross-sectional dimension of the tab 31 in the XZ plane is smaller, one end of the tab 31 extending out of the through hole 62 is bent to form a flange 311 parallel to the XZ plane, and the contact area between the tab 31 and the conductive block 41 is increased by using the flange 311, so that the connection stability between the conductive block 41 and the tab 31 is better.
Optionally, the shielding cover 6 is made of a material having thermal conductivity and corrosion resistance.
The insulating cover 6 has corrosion resistance, can be prevented from being corroded by leaked electrolyte, and has a protection function on the heat-conducting glue 5 in the insulating cover, and on the other hand has heat conductivity, heat absorbed by the heat-conducting glue 5 can be transferred to the shell 1 through the insulating cover 6, so that the heat dissipation performance of the end part of the battery cell is ensured.
In another embodiment of the present utility model, a battery pack includes the above-mentioned battery cell. The battery pack has the same advantages as the above-described battery cells compared with the prior art, and the description thereof will not be repeated.
As shown in fig. 3-4, the battery pack optionally further includes a liquid cooling plate 7, wherein the liquid cooling plate 7 contacts one side surface of the housing 1, and the heat-conducting glue 5 is disposed near the side surface of the housing 1 contacting the liquid cooling plate 7.
Specifically, the liquid cooling plate 7 is in a rectangular plate structure, the electric core is arranged in the direction shown in the figure, the electric core extends along the direction shown by the Y axis, the front and the back of the electric core are parallel to the YZ plane, the top and the bottom of the electric core are parallel to the XY plane, when the liquid cooling plate 7 is arranged in one, the liquid cooling plate 7 can be in contact with any one of the front, the back, the top and the bottom of the shell 1 of the electric core, wherein fig. 3 is a schematic diagram of the installation of the liquid cooling plate 7 and the bottom of the shell 1, the installation mode of the liquid cooling plate 7 and the installation mode of the liquid cooling plate on the bottom of the shell 1 are the same, and fig. 4 is a schematic diagram of the installation of the liquid cooling plate 7 and the front of the shell 1, and the installation mode of the liquid cooling plate 7 and the back of the shell 1 are the same.
Taking the laminating of liquid cooling board 7 and casing 1 bottom surface as an example, heat conduction glue 5 is close to casing 1 with the side setting of liquid cooling board 7 contact, promptly the clearance between the tip of utmost point core 3 and the apron 2 can not fully fill up heat conduction glue 5, specifically, heat conduction glue 5 fills between the tip of utmost point core 3 and the negative one end of apron 2 along the Z axle, does not fill between the positive one end of utmost point core 3 and apron 2 along the Z axle, is utilizing heat conduction glue 5 to pass through casing 1, apron 2 to transfer the heat to the liquid cooling board 7 of below, realizes quick radiating, can also save the use amount of heat conduction glue 5, reduce cost.
Of course, in other embodiments, a plurality of electric cells and a plurality of liquid cooling plates 7 may be disposed in the battery pack, the electric cells are sequentially arranged, the liquid cooling plates 7 and the electric cells are alternately disposed, and two of the sides parallel to the XY plane or the YZ plane of the casing 1 of a part of the electric cells may be respectively in contact with the two liquid cooling plates 7. The specific number of the liquid cooling plates can be set with the liquid cooling plates 7 at proper positions according to the cooling requirements of the battery cells. When a plurality of surfaces of the battery cell are contacted with the liquid cooling plates 7, the gap between the end part of the pole core 3 and the cover plate 2 can be completely filled with the heat-conducting glue 5, so that the heat of the end part of the battery cell is ensured to be rapidly transferred to each liquid cooling plate 7 through the shell 1 and the cover plate 2 by the heat-conducting glue 5, and the heat dissipation effect of the battery cell is improved.
Another embodiment of the present utility model provides a vehicle including the above battery pack.
According to the vehicle, the heat conducting glue 5 is filled in the gaps between the two ends of the electrode core of the battery pack and the shell and the cover plate, and in the working process of the battery pack, heat generated by the electrode lugs and the electrode posts at the two ends of the battery core can be more rapidly transferred to the shell and the cover plate through the heat conducting glue 5 until reaching the external environment, so that the heat dissipation effect at the two ends of the battery core is improved, the integral temperature difference of the battery core is smaller, the performance of the battery core and the battery pack is improved, and the service lives of the battery core and the battery pack are prolonged.
Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.
Claims (10)
1. The utility model provides an electricity core, its characterized in that, includes casing (1), apron (2), utmost point core (3), utmost point post (4) and heat conduction glue (5), utmost point core (3) are located in casing (1), utmost point core (3) are close to the tip of apron (2) is equipped with utmost point ear (31), the one end of utmost point post (4) is passed apron (2) in order to be connected with utmost point ear (31), utmost point core (3) with clearance packing between apron (2) has heat conduction glue (5), heat conduction glue (5) with utmost point post (4) and/or utmost point ear (31) contact, and with apron (2) and/or casing (1) contact.
2. The cell according to claim 1, further comprising an isolation cover (6), wherein the isolation cover (6) is arranged on one side of the pole core (3) close to the cover plate (2), and the heat-conducting glue (5) is filled between the isolation cover (6) and the cover plate (2).
3. The cell according to claim 2, characterized in that the isolation cover (6) is provided with a containing cavity (61) with an opening facing one side of the cover plate (2), the containing cavity (61) is filled with the heat conducting glue (5), and the cover plate (2) is connected with the isolation cover (6) and is in contact with the heat conducting glue (5).
4. A cell according to claim 3, characterized in that the cover plate (2) is provided with glue injection holes (21), and the glue injection holes (21) are communicated with the accommodating cavity (61).
5. A cell according to claim 3, wherein the bottom of the receiving cavity (61) is provided with a through hole (62), one end of the pole (4) extending into the cover plate (2) is provided with a conductive block (41), and the pole lug (31) passes through the through hole (62) to be connected with the conductive block (41).
6. The battery cell according to claim 5, wherein one end of the tab (31) is bent after passing through the through hole (62) to form a flange (311), and the flange (311) is in fit connection with the conductive block (41).
7. The battery cell according to claim 1, wherein two ends of the housing (1) along the length direction are respectively provided with an opening, and two cover plates (2) are respectively covered at the corresponding openings.
8. A battery pack comprising the cell of any one of claims 1-7.
9. The battery pack according to claim 8, further comprising a liquid cooling plate (7), wherein the liquid cooling plate (7) is in contact with one side surface of the housing (1) of the battery cell, and the heat conductive adhesive (5) is disposed near the side surface of the housing (1) in contact with the liquid cooling plate (7).
10. A vehicle comprising a battery pack according to any one of claims 8-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420730185.0U CN222380668U (en) | 2024-04-10 | 2024-04-10 | Battery cell, battery pack and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420730185.0U CN222380668U (en) | 2024-04-10 | 2024-04-10 | Battery cell, battery pack and vehicle |
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| Publication Number | Publication Date |
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| CN222380668U true CN222380668U (en) | 2025-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202420730185.0U Active CN222380668U (en) | 2024-04-10 | 2024-04-10 | Battery cell, battery pack and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120184533A (en) * | 2025-05-22 | 2025-06-20 | 江苏正力新能电池技术股份有限公司 | Battery cell and method for preparing the same |
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2024
- 2024-04-10 CN CN202420730185.0U patent/CN222380668U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120184533A (en) * | 2025-05-22 | 2025-06-20 | 江苏正力新能电池技术股份有限公司 | Battery cell and method for preparing the same |
| CN120184533B (en) * | 2025-05-22 | 2025-08-26 | 江苏正力新能电池技术股份有限公司 | Battery monomer and preparation method thereof |
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