CN111933860A - Lithium ion battery package heat radiation structure and lithium ion battery package - Google Patents
Lithium ion battery package heat radiation structure and lithium ion battery package Download PDFInfo
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- CN111933860A CN111933860A CN202010983473.3A CN202010983473A CN111933860A CN 111933860 A CN111933860 A CN 111933860A CN 202010983473 A CN202010983473 A CN 202010983473A CN 111933860 A CN111933860 A CN 111933860A
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- air
- battery
- lithium ion
- heat dissipation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6566—Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a lithium ion battery pack heat dissipation structure and a lithium ion battery pack, wherein the battery pack comprises a plurality of battery cells, and the heat dissipation structure is arranged in a gap between a first battery cell and a second battery cell which are adjacent; the heat dissipation structure comprises a first air return support, a second air return support and a plurality of assembled air return supports; the first air return support is fixed on one surface of the first battery cell adjacent to the second battery cell, and the second air return support is fixed on one surface of the second battery cell adjacent to the first battery cell; the assembly air return support is of a frame structure, is respectively clamped with the first air return support and the second air return support, is communicated with the cooling air channel, and is provided with a plurality of ventilation openings. The method for adding the return air and the battery restraint part between the batteries can ensure that cooling air passes through the surfaces of the batteries, has high heat dissipation efficiency, can adjust the passing air quantity, has low passing air quantity at an inlet and high passing air quantity at an outlet, and promotes the temperature of each battery to be more uniform.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a heat dissipation structure of a lithium ion battery pack and the lithium ion battery pack.
Background
Because the lithium ion battery has the advantages of high energy density, long service life, environmental protection and the like, the lithium ion battery is widely applied to the fields of energy storage, electric tools and automobiles. With the technological progress and the pressure to reduce costs, lithium ion batteries are developing toward large-scale and high energy density, which puts higher demands on heat dissipation and thermal management of the batteries. Because the service life of the lithium ion battery is shortened sharply at high temperature, the heat generated by each battery is different, the heat generated by the battery needs to be diffused out in time, otherwise the service life of the battery is rapidly reduced, even explosion or combustion is caused, and therefore the lithium ion battery needs a targeted heat dissipation design when in application, particularly in large-magnification and long-time application.
The temperature of the cells also needs to be kept uniform or else there will be a large difference in cell uniformity over time of operation, resulting in a reduced life of the battery pack due to the "short plate effect". After a battery is used for a long time, the battery undergoes swelling deformation, and if the deformation is large, the capacity is rapidly reduced, and the service life is ended in advance.
The current technical scheme mainly adopts air cooling (also called air cooling) and liquid cooling (mainly water cooling). Air cooling removes heat from the battery pack by air flow. The liquid cooling is that the heat in the battery pack is taken away through the flowing of cooling water by arranging liquid cooling pipelines in the battery pack. Liquid cooling can ensure the uniformity of the temperature of the batteries in the battery pack through methods such as arrangement design of pipelines, flow rate control and the like, and air cooling is difficult to ensure the uniform distribution of the temperature of the batteries. However, the liquid cooling structure is complex, the cost is high, and the liquid cooling structure is often only applied to limited scenes such as new energy vehicles with high requirements and few batteries. For large-scale energy storage systems and indoor energy storage systems, air cooling is a better choice, however, although the air cooling is low in cost, the air duct design is complex, the temperature distribution of the battery is easy to be uneven, and the consistency of the battery is rapidly deteriorated. In order to ensure the air-cooled heat dissipation effect, certain gaps need to be reserved between the batteries, the batteries cannot be effectively constrained due to the reserved gaps, the batteries are easy to expand and deform, the capacity is quickly attenuated, and the service life is shortened.
In the air cooling mode, the inlet of the air duct is disposed on the back/front side of the battery cabinet, and the outlet is disposed on the front/back side of the battery cabinet. The air cooling design of battery package has two kinds of modes, one kind is battery interval arrangement, separates and fixes the battery through upper and lower baffle, leaves certain clearance between the battery, and the cooling air is taken away the battery heat from the battery surface through going into the wind gap, and the battery temperature that is close to the income wind gap is obviously less than the temperature of air outlet, and the battery will expand deformation after long-time the use, leads to the uniformity variation, capacity decay. The other method is that the batteries are firstly assembled into a module, the two ends of the module are used for constraining the batteries, cooling air is blown from the bottoms of the batteries to take away heat of the batteries, the temperature consistency of each battery is high, the battery is not easy to expand and deform, the service life is long, the cooling efficiency is low, and the number or power of fans needs to be increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lithium ion battery pack heat dissipation structure and a lithium ion battery pack.
The technical scheme adopted by the invention for realizing the purpose is as follows: a heat dissipation structure of a lithium ion battery pack comprises a plurality of battery cells, and is characterized in that the heat dissipation structure is arranged in a gap between a first battery cell and a second battery cell which are adjacent to each other; the heat dissipation structure comprises a first air return support, a second air return support and a plurality of assembled air return supports; the first air return support is fixed on one surface of the first battery cell adjacent to the second battery cell, and the second air return support is fixed on one surface of the second battery cell adjacent to the first battery cell; the assembly air return support is of a frame structure, is respectively clamped with the first air return support and the second air return support, is communicated with the cooling air channel, and is provided with a plurality of ventilation openings.
The first air return support is a cross-shaped support, and an end point is located at a deformation stress point of the first battery cell.
The second air return support is a cross-shaped support, and the end point is located at the position of the deformation stress point of the second battery cell.
The assembled return air bracket is of a rectangular frame structure.
When the assembly return air support is a plurality of, connect through the buckle between the assembly return air support.
A lithium ion battery pack comprises a plurality of battery cells, and a heat dissipation structure of the lithium ion battery pack is fixed between every two adjacent battery cells.
The invention has the following advantages and beneficial effects:
1. the method for adding the return air and the battery restraint part between the batteries can ensure that cooling air passes through the surfaces of the batteries, has high heat dissipation efficiency, can adjust the passing air quantity, has low passing air quantity at an inlet and high passing air quantity at an outlet, and promotes the temperature of each battery to be more uniform.
2. The invention is arranged between two batteries, provides support on the surfaces of the batteries, restrains the expansion deformation of the batteries and prolongs the service life of the batteries.
3. The invention does not influence the design of the battery pack by adding the device, and achieves the purposes of uniform battery temperature, high heat dissipation efficiency, difficult deformation and long service life by utilizing the gaps among the batteries.
Drawings
Fig. 1 is an exploded view of a heat dissipation structure according to an embodiment of the present invention;
fig. 2 is a connection structure diagram of a second return air bracket, a second electrical core and an assembled return air bracket according to the embodiment of the present invention;
fig. 3 is a connection structure diagram of the heat dissipation structure, the first battery cell, and the second battery cell according to the embodiment of the present invention;
fig. 4 is an exploded view of a lithium ion battery pack according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 3, a heat dissipation structure of a lithium ion battery pack, where the battery pack includes a plurality of battery cells inside, is disposed in a gap between a first battery cell 1 and a second battery cell 2 that are adjacent to each other; the heat dissipation structure comprises a first air return bracket 11, a second air return bracket 12 and a plurality of assembled air return brackets 13; the first air return bracket 11 is fixed on one surface of the first battery cell 1 adjacent to the second battery cell 2, and the second air return bracket 12 is fixed on one surface of the second battery cell 2 adjacent to the first battery cell 1; the assembly air return support 13 is of a frame structure, is respectively connected with the first air return support 11 and the second air return support 12 in a clamped mode, is communicated with the cooling air channel, and is provided with a plurality of ventilation openings 131.
The first air return support 11 is a cross-shaped support, and an end point is located at a deformation stress point of the first battery cell 1. The second air return bracket 12 is a cross-shaped bracket, and the end point is located at a deformation stress point position a (shown in fig. 2) of the second electrical core 2. The assembled return air bracket 13 is a rectangular frame structure. When the equipment return air support 13 is a plurality of, be equipped with the draw-in groove on a plurality of equipment return air supports respectively, mutual joint.
The first air return support 11 is provided with a plurality of first clamping grooves 111, the second air return support 12 is provided with a plurality of second clamping grooves 121, and the first clamping grooves 111 and the second clamping grooves 121 correspond to the positions of the assembled air return support 13 and are used for being clamped with the assembled air return support 13.
The structures of the first return air bracket 11 and the second return air bracket 12 depend on the positions and the number of deformation stress points on the surface of the battery, and are not limited to the relative positions shown in fig. 1-3, and the first return air bracket 11 and the second return air bracket 12 can prevent the battery from expanding and deforming. The assembled return air bracket 13 is not limited to a rectangular structure, and the first return air bracket 11, the second return air bracket 12 and the assembled return air bracket 13 are all hollow structures.
First return air support 11 and second return air support 12 are installed respectively on first electric core 1 and second electric core 2, and when first electric core 1 constitutes the module with second electric core 2, first return air support 11 and second return air support 12 just in time the joint together, promptly at the coplanar, the distance between first electric core 1 and the second electric core 2 is first return air support 11 and the thickness of second return air support 12 promptly.
As shown in fig. 4, the lithium ion battery pack of the present invention mainly includes a battery cell 23, a battery management module 27, a battery cell connection block 210, a top separator 24, a bottom tray 21, an upper separator bracket 25, an upper case 26 and a lower case 22 of the pack body, and the assembling steps are as follows:
1) at first need be fixed bottom tray 21 through bolted connection's mode and the lower shell 22 of battery package, this bottom tray material is the plastic part, and the primary function is to bear and separate each electric core 23, and the material of lower shell 22 is the sheet metal component, and the primary function is as the shell of battery module, bears each components and parts.
2) The return air restraint device is divided into a first return air support 11 and a second return air support 12 which can be matched into a whole through a clamping groove. The first air return bracket 11 and the second air return bracket 12 are mounted on the outer shell surfaces of the adjacent electric cores in the battery pack in advance in an adhesive manner. The contact point of the return air restraint device and the surface of the electric core is just the easy expansion deformation point or the deformation stress point of the electric core, and the return air restraint device is made of a material with high strength and good heat conduction.
3) Then, the battery cells 23 are placed into the grooves of the bottom tray one by one, the clamping grooves of the first air return support 11 and the second air return support 12 are correspondingly clamped and combined into a whole, the top partition plate 24 is placed above the battery cells 23, and the top partition plate 24 is mainly used for finishing the relative fixation of the battery cells 23 so as to ensure that the adjacent battery cells 23 cannot be contacted with each other.
4) When the structure of the top partition plate 24 is designed, the design of the slot holes needs to be performed according to the size of the corresponding battery cell 23, so that the positive and negative poles of the battery cell 23 and the explosion-proof valve are completely exposed, and then the battery cell connecting block 210 and the positive and negative poles of the battery cell 23 are fixed in a welding manner, so that series-parallel connection between the battery cells 23 is realized.
5) The upper diaphragm support 25 is then fixed to the upper casing 26 by means of bolting.
6) The battery management module 27 is then mounted on the front panel of the battery pack by means of bolting.
7) The battery detection harness and the battery management module 27 are connected by a harness.
8) The modular upper housing 26 is then bolted to the lower housing 22. The lower housing 22 has an air duct opening at the back for the inlet of cooling air and a corresponding air duct opening or fan 28 at the front for the outlet 29 of cooling air. At this time, all the structural parts and the electric parts are fixed and connected.
The return air blocking surface of the return air restraining device is adjustable, the return air restraining device with the largest return air blocking surface is installed on the battery close to the cooling air inlet and is sequentially reduced, and the return air restraining device with the smallest return air blocking surface is installed on the battery close to the cooling air outlet so as to ensure that the temperature of the battery is uniform. The size of the return air blocking surface can be adjusted by the number of the assembled return air brackets 13, and small holes are formed in the assembled return air brackets 13. The easy expansion deformation position and the deformation stress point of the battery are determined through simulation and experiments, and the contact stress point of the return air restraint device corresponds to the positions to restrain the battery to the maximum extent so as to prevent the battery from expansion deformation. The first return air bracket 11 and the second return air bracket 12 can rotate around the center, and can finely adjust the deformation stress point.
The size of the air return surface is changed by increasing the number of the assembled air return supports 13 so as to adjust the heat dissipation efficiency, so that the temperature between the battery cells 23 is kept uniform, and the deformation stress points of the first air return support 11 and the second air return support 12 are adjusted so as to prevent the battery cells 23 from expanding and deforming so as to guarantee the cycle life of the battery cells.
Claims (6)
1. A heat dissipation structure of a lithium ion battery pack comprises a plurality of battery cells, and is characterized in that the heat dissipation structure is arranged in a gap between a first battery cell and a second battery cell which are adjacent to each other; the heat dissipation structure comprises a first air return support, a second air return support and a plurality of assembled air return supports; the first air return support is fixed on one surface of the first battery cell adjacent to the second battery cell, and the second air return support is fixed on one surface of the second battery cell adjacent to the first battery cell; the assembly air return support is of a frame structure, is respectively clamped with the first air return support and the second air return support, is communicated with the cooling air channel, and is provided with a plurality of ventilation openings.
2. The lithium ion battery pack heat dissipation structure of claim 1, wherein the first air-return bracket is a cross-shaped bracket, and an end point is located at a position of a deformation stress point of the first electrical core.
3. The lithium ion battery pack heat dissipation structure of claim 1, wherein the second return air bracket is a cross-shaped bracket, and an end point is located at a deformation stress point of the second electrical core.
4. The lithium ion battery pack heat dissipation structure of claim 1, wherein the assembled return air bracket is a rectangular frame structure.
5. The lithium ion battery pack heat dissipation structure of claim 1, wherein when a plurality of the assembled return air brackets are provided, the assembled return air brackets are connected by a snap fit.
6. A lithium ion battery pack, comprising a plurality of battery cells, wherein the heat dissipation structure of any one of claims 1 to 5 is fixed between the adjacent battery cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010983473.3A CN111933860A (en) | 2020-09-18 | 2020-09-18 | Lithium ion battery package heat radiation structure and lithium ion battery package |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010983473.3A CN111933860A (en) | 2020-09-18 | 2020-09-18 | Lithium ion battery package heat radiation structure and lithium ion battery package |
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| CN111933860A true CN111933860A (en) | 2020-11-13 |
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| CN202010983473.3A Pending CN111933860A (en) | 2020-09-18 | 2020-09-18 | Lithium ion battery package heat radiation structure and lithium ion battery package |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000161880A (en) * | 1998-11-26 | 2000-06-16 | Toshiba Corp | Heat pipe type cooler |
| CN1835275A (en) * | 2005-03-16 | 2006-09-20 | 奇瑞汽车有限公司 | Hybrid power automobile battery |
| US20100132761A1 (en) * | 2007-04-24 | 2010-06-03 | Mitsubishi Electric Corporation | Solar cell module |
| CN106654443A (en) * | 2016-11-15 | 2017-05-10 | 上海玖行能源科技有限公司 | Battery box capable of automatically realizing temperature closed-loop control |
| CN206432355U (en) * | 2016-11-15 | 2017-08-22 | 上海玖行能源科技有限公司 | It is a kind of to realize the battery case of temperature scaling factor automatically |
| CN206441818U (en) * | 2016-12-29 | 2017-08-25 | 国联汽车动力电池研究院有限责任公司 | A kind of lithium ion power battery module available for air-cooled and liquid-cooling heat radiation |
| CN207800826U (en) * | 2017-12-15 | 2018-08-31 | 深圳市沃特玛电池有限公司 | A kind of battery pack of shunting heat dissipation |
| CN208208934U (en) * | 2018-06-19 | 2018-12-07 | 宁波石墨烯创新中心有限公司 | Battery core group unit and cell apparatus |
| CN211350125U (en) * | 2020-03-14 | 2020-08-25 | 升辉电线电缆(深圳)有限公司 | Unshielded twisted pair |
| CN211509574U (en) * | 2020-04-16 | 2020-09-15 | 肥东凯利电子科技有限公司 | Anti-deformation device of electric vehicle controller |
| CN212323148U (en) * | 2020-09-18 | 2021-01-08 | 傲普(上海)新能源有限公司 | Lithium ion battery package heat radiation structure and lithium ion battery package |
-
2020
- 2020-09-18 CN CN202010983473.3A patent/CN111933860A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000161880A (en) * | 1998-11-26 | 2000-06-16 | Toshiba Corp | Heat pipe type cooler |
| CN1835275A (en) * | 2005-03-16 | 2006-09-20 | 奇瑞汽车有限公司 | Hybrid power automobile battery |
| US20100132761A1 (en) * | 2007-04-24 | 2010-06-03 | Mitsubishi Electric Corporation | Solar cell module |
| CN106654443A (en) * | 2016-11-15 | 2017-05-10 | 上海玖行能源科技有限公司 | Battery box capable of automatically realizing temperature closed-loop control |
| CN206432355U (en) * | 2016-11-15 | 2017-08-22 | 上海玖行能源科技有限公司 | It is a kind of to realize the battery case of temperature scaling factor automatically |
| CN206441818U (en) * | 2016-12-29 | 2017-08-25 | 国联汽车动力电池研究院有限责任公司 | A kind of lithium ion power battery module available for air-cooled and liquid-cooling heat radiation |
| CN207800826U (en) * | 2017-12-15 | 2018-08-31 | 深圳市沃特玛电池有限公司 | A kind of battery pack of shunting heat dissipation |
| CN208208934U (en) * | 2018-06-19 | 2018-12-07 | 宁波石墨烯创新中心有限公司 | Battery core group unit and cell apparatus |
| CN211350125U (en) * | 2020-03-14 | 2020-08-25 | 升辉电线电缆(深圳)有限公司 | Unshielded twisted pair |
| CN211509574U (en) * | 2020-04-16 | 2020-09-15 | 肥东凯利电子科技有限公司 | Anti-deformation device of electric vehicle controller |
| CN212323148U (en) * | 2020-09-18 | 2021-01-08 | 傲普(上海)新能源有限公司 | Lithium ion battery package heat radiation structure and lithium ion battery package |
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