CN214797540U - Annular lithium ion battery pack with thermal management function - Google Patents
Annular lithium ion battery pack with thermal management function Download PDFInfo
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- CN214797540U CN214797540U CN202121387217.4U CN202121387217U CN214797540U CN 214797540 U CN214797540 U CN 214797540U CN 202121387217 U CN202121387217 U CN 202121387217U CN 214797540 U CN214797540 U CN 214797540U
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses an annular lithium ion battery group with thermal management function, including two interconnect's annular lithium ion battery monomer, it has phase change material to fill between battery housing and the outer heating cylinder, and outer heating cylinder suit is in the periphery of electric core, and the upper end cover is provided with temperature sensor, anodal utmost point post and negative pole utmost point post, is connected relatively through dovetail and forked tail slider between the annular lithium ion battery monomer and constitutes the group battery. The utility model discloses inside arranging inside and outside cartridge heater and phase change material in the battery, can begin to heat or dispel the heat to the battery simultaneously from inside and outside, can realize annular lithium ion battery monomer independent free combination and form the group battery, and pack phase change material inside annular lithium ion battery monomer, with inside and outside cartridge heater synergism, have the heat management function, at low temperature heating annular lithium ion battery monomer, dispel the heat to annular lithium ion battery monomer during high temperature, improved annular lithium ion battery monomer's working property.
Description
Technical Field
The utility model belongs to the technical field of power battery, especially, relate to an annular lithium ion battery group with heat management function.
Background
With the development of electric vehicles, power batteries represented by lithium batteries are widely used in electric vehicles by virtue of the advantages of high energy density, high power density, long cycle life and the like.
However, the performance and safety of lithium batteries are significantly affected by temperature, and both high temperature and low temperature are not favorable for normal operation of lithium batteries. The lithium ion battery has the advantages that the charge and discharge capacity is rapidly reduced at low temperature, the vehicle performance is seriously degraded, and during low-temperature charging, the lithium ion battery electrode is easy to generate the lithium separation phenomenon, and the risks of short circuit and the like are easily caused. When the temperature is high, the lithium battery needs to be radiated, otherwise, the thermal runaway of the battery is easily caused.
At present, the battery heating modes mainly comprise air heating and liquid heating, although the two modes have simpler structures, the two modes need external equipment for assistance, occupy a certain space, and have low air heating efficiency and long required time; compared with air heating, liquid heating improves heating efficiency, but the cost is greatly increased, and heating still needs a certain time. In the aspect of high-temperature heat dissipation, as people continuously improve the understanding of phase-change materials, more and more researchers begin to research the phase-change materials. Compared with air cooling and liquid cooling, the phase change material has good formability in the aspect of high-temperature heat dissipation of the lithium battery, is suitable for batteries with various shapes, has low cost and high phase change latent heat, and is an ideal heat dissipation material.
The current research on battery thermal management focuses on batteries with established structures, and thermal management is carried out on the basis of the existing battery structures. Although the cylindrical battery has a simple manufacturing process, the cylindrical battery is prone to heat accumulation at the central position due to the self-heating property of the battery, and the cylindrical battery can exchange heat only through the outer surface of the cylinder, so that the heat at the central position of the cylinder is not easy to dissipate, and the cylindrical battery structure brings great difficulty to the design of the battery and the thermal management of the battery.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problem of the existing cylindrical battery, from the perspective of changing the structure of the battery, the annular lithium ion battery pack with the heat management function is provided, the heat exchange efficiency is improved, the battery can be heated at low temperature, and the heat of the battery is dissipated at high temperature. The working performance of the battery is improved.
The utility model adopts the following technical scheme to realize the purpose. An annular lithium ion battery pack with a thermal management function comprises two annular lithium ion battery monomers which are connected with each other, wherein each annular lithium ion battery monomer comprises an inner heating cylinder, a cylindrical winding sheet, an electric core and a battery shell, phase-change materials are filled in the inner heating cylinder, the winding sheet is arranged on the periphery of the inner heating cylinder, and the electric core is wound on the periphery of the winding sheet; the controller is arranged outside the battery shell, and the phase-change material is filled between the battery shell and the outer heating cylinder; the external heating barrel is sleeved on the periphery of the battery core; the lower end of the annular lithium ion battery monomer is packaged with a lower end cover, the upper end of the annular lithium ion battery monomer is packaged with an upper end cover, and the upper end cover is provided with a temperature sensor, a positive pole column and a negative pole column; the upper end of the battery core is connected with a lead positive plate and a lead negative plate, and the positive plate and the negative plate are respectively and correspondingly connected with a positive pole post and a negative pole post on the upper end cover; connecting seats are arranged on the upper end cover and the lower end cover of the annular lithium ion battery monomer, the connecting seats are quadrilateral, blocking pieces are arranged at the opposite angles of the port of the inner hole in the middle of the connecting seats, dovetail grooves are arranged at two adjacent sides of one side of each connecting seat, dovetail slide blocks correspondingly matched with the dovetail grooves are arranged at two adjacent sides of the other side of each connecting seat, and the annular lithium ion battery monomer is oppositely connected with the dovetail slide blocks through the dovetail grooves to form a battery pack; the anode pole column and the cathode pole column between the annular lithium ion battery monomers in the battery pack are correspondingly connected through the connecting sheet, so that the parallel connection electrification of the battery pack is realized.
Preferably, the material of the battery core is paraffin wax.
Preferably, expanded graphite, foamed aluminum, foamed graphite, carbon fiber or aluminum particles may be added to the paraffin-based material.
Preferably, the temperature sensing range of the temperature sensor is-30-60 ℃.
Preferably, the controller is provided with a first preset temperature and a second preset temperature.
Preferably, the first preset temperature is-10 ℃.
Preferably, the second preset temperature is 0 ℃.
Preferably, the inner heating cylinder and the outer heating cylinder are both made of iron-chromium-aluminum alloy with high thermal conductivity and high resistivity, the thermal conductivity is 52 KJ/m.h.c, and the resistivity is 1.6 x 10-6Ω·m。
The utility model discloses inside arranging inside and outside cartridge heater and phase change material in the battery, can begin to heat or dispel the heat to the battery simultaneously from inside and outside, can realize annular lithium ion battery monomer independent free combination and form the group battery, and pack phase change material inside annular lithium ion battery monomer, with inside and outside cartridge heater synergism, have the heat management function, at low temperature heating annular lithium ion battery monomer, dispel the heat to annular lithium ion battery monomer during high temperature, improved annular lithium ion battery monomer's working property.
Drawings
Fig. 1 is a schematic cross-sectional view of a middle ring-shaped lithium ion battery cell 100 according to the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic diagram of a partially enlarged structure of the battery case 7 and the outer heating cylinder 6 according to the present invention;
fig. 4 is a schematic perspective view of the upper end cap 8 of the present invention;
fig. 5 is a schematic perspective view of the middle and lower end caps 11 of the present invention;
fig. 6 is a schematic perspective view of the connecting seat 14 of the present invention;
fig. 7 is a schematic plan view of the connecting piece 16 of the present invention;
fig. 8 is a schematic perspective view of the ring-shaped lithium ion battery pack according to the present invention;
fig. 9 is a circuit diagram of the controller 13 according to the present invention.
In the figure: 1. the battery comprises an inner heating cylinder, 2. a winding sheet, 3. a battery core, 4. a positive electrode sheet, 5. a negative electrode sheet, 6. an outer heating cylinder, 7. a battery shell, 8. an upper end cover, 9. a positive electrode pole, 10. a negative electrode pole, 11. a lower end cover, 12. a phase change material, 13. a controller, 14. a connecting seat, 141. a dovetail groove, 142. a dovetail sliding block, 143. a separation blade, 15. a temperature sensor and 16. a connecting sheet.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. See fig. 1-9. An annular lithium ion battery pack with a thermal management function comprises two annular lithium ion battery units 100 which are connected with each other, wherein each annular lithium ion battery unit 100 comprises an inner heating cylinder 1, a cylindrical winding sheet 2, an electric core 3 and a battery shell 7 (shown in figures 1 and 2), a phase change material 12 is filled in each inner heating cylinder 1, the winding sheet 2 is arranged on the periphery of each inner heating cylinder 1, and the electric core 3 is wound on the periphery of each winding sheet 2; a controller 13 is arranged outside the battery shell 7, and a phase change material 12 (shown in figure 3) is filled between the battery shell 7 and the outer heating cylinder 6; the external heating cylinder 6 is sleeved on the periphery of the electric core 3; a lower end cover 11 (shown in fig. 5) is packaged at the lower end of the annular lithium ion battery monomer 100, an upper end cover 8 is packaged at the upper end, and the upper end cover 8 is provided with a temperature sensor 15, a positive pole post 9 and a negative pole post 10 (shown in fig. 4); the upper end of the battery core 3 is connected with a lead positive plate 4 and a lead negative plate 5, and the positive plate 4 and the negative plate 5 are respectively and correspondingly connected with a positive pole post 9 and a negative pole post 10 on an upper end cover 8; the upper end cover 8 and the lower end cover 11 of the annular lithium ion battery monomer 100 are both provided with a connecting seat 14 (as shown in fig. 6), the connecting seat 14 is quadrilateral, the port of an inner hole in the middle is diagonally provided with a baffle 143, two adjacent sides of one side of the connecting seat 14 are provided with dovetail grooves 141, two adjacent sides of the other side are provided with dovetail sliders 142 correspondingly matched with the dovetail grooves 141, and the annular lithium ion battery monomer 100 and the dovetail sliders 142 are oppositely connected through the dovetail grooves 141 to form a battery pack (as shown in fig. 7 and 8); the anode pole 9 and the cathode pole 10 of the annular lithium ion battery monomer 100 in the battery pack are correspondingly connected through the connecting sheet 16, so that the parallel connection electrification of the battery pack is realized. The material of the battery cell 3 is paraffin. Expanded graphite, foamed aluminum, foamed graphite, carbon fiber or aluminum particles may be added to the paraffin-based material. The temperature sensing range of the temperature sensor 15 is-30-60 ℃. The controller 13 is provided with a first preset temperature and a second preset temperature. The first preset temperature is-10 ℃. The second preset temperature is 0 ℃. The inner heating cylinder 1 and the outer heating cylinder 6 are both made of iron-chromium-aluminum alloy with high thermal conductivity and high resistivity, the thermal conductivity is 52 KJ/m.h.c, and the resistivity is 1.6 x 10 < -6 > omega.m.
The utility model discloses controller 13 includes control panel and control circuit (as shown in fig. 9), mainly include that temperature sensor 15 connects position H1 and connects temperature sensor 15, operational amplifier U2, heating cylinder 1 and outer heating cylinder 6 heat and disconnection in the Q1 control, positive pole post 9 draws forth the wire and connects J3, negative pole post 10 draws forth the wire and connects J5, interior heating cylinder 1 draws forth two wires from lower extreme cover 11 centre bore draw forth with controller 13 in J1 and J2 be connected, outer heating cylinder 6 draws out two wires from lower extreme cover 11 centre bore draw forth with controller 13 in J6 and J7 be connected, J4 connects negative pole post 10, battery current switches on control panel 13 this moment but does not pass through interior heating cylinder 1 and outer heating cylinder 6, its specific control method is:
1) an operational amplifier in the controller 13 is connected with an INB in the U2 to receive a signal of the temperature sensor 15, when the temperature sensor 15 detects that the temperature of the annular lithium ion battery monomer 100 is lower than-10 ℃, an OUTB output current in the U2, a CJ8820 is connected with the inner heating cylinder 1 and the outer heating cylinder 6 and starts to work to generate heat through the current, and the heat emitted by the annular lithium ion battery monomer 100 is cooperated with the heat emitted by the battery; when the temperature sensor 15 detects that the temperature of the annular lithium ion battery monomer 100 is 0 ℃ or above, OUTB in U2 does not output current, CJ8820 disconnects the inner heating cylinder 1 and the outer heating cylinder 6, and heat generation is stopped;
2) when the temperature of the annular lithium ion battery monomer 100 reaches the melting temperature of the phase change material 12, the internal and external phase change materials 12 begin to absorb heat to dissipate heat of the annular lithium ion battery monomer 100, and the phase change material 12 stops absorbing heat until the phase change material 12 is completely melted;
3) when the temperature of the annular lithium ion battery monomer 100 is above 0 ℃ and below the melting temperature of the phase change material 12, the annular lithium ion battery monomer 100 normally works.
The inner heating cylinder 1 and the outer heating cylinder 6 are made of iron-chromium-aluminum alloy with high thermal conductivity and high resistivity, the thermal conductivity is 52 KJ/m.h.c, and the resistivity is 1.6 x 10 < -6 > omega.m.
The phase-change material 12 is a fusion of 80% paraffin and 20% expanded graphite, and the thermal conductivity coefficient is improved from 0.24. m-1. K-1 of single paraffin to 1.23. m-1. K-1, which is 5 times of that of single paraffin.
The utility model provides a temperature sensor 15 is responsible for gathering the free 100 temperatures of annular lithium ion battery, and the temperature transfer that will gather is for controller 13, and temperature sensor 15's temperature-sensing scope is-30 ℃ -60 ℃.
The phase change material 12 is paraffin-based. Preferably, expanded graphite, foamed aluminum, foamed graphite, carbon fiber or aluminum particles may be incorporated into the phase change material 12 to increase the thermal conductivity of the material. The utility model discloses preferred use paraffin among the phase change material 12, the solid-liquid phase transition temperature of paraffin changes along with the length of the carbon chain of the paraffin molecule of constitution paraffin, approximately within 5.5 ~ 75.9 ℃, and preferred carbon atom number is 18, and phase transition temperature is 28 ℃'s paraffin. That is, the phase change temperature of the phase change material 12 is 28 ℃.
The latent heat of the phase change material 12 in the phase change process is used for cooling, heating and insulating the battery. The phase change temperature of the phase change material 12 is close to the optimum working temperature of the lithium battery, and the phase change material 12 can absorb heat from the inside of the battery or emit heat to the environment in the phase change process, so that the aims of storing and releasing energy and adjusting energy demand and supply are fulfilled.
The controller 13 includes a control board and a control circuit (as shown in fig. 9), and mainly includes a connection part H1 of the temperature sensor 15, which is connected with the temperature sensor 15, an operational amplifier U2 which controls the heating and disconnection Q1 of the inner heating cylinder 1 and the outer heating cylinder 6, a J3 which is connected with the anode pole 9, a J5 which is connected with the cathode pole 10, a J1 and a J2 which are connected with the inner heating cylinder 1, a J6 and a J7 which are connected with the outer heating cylinder 6, and a J4 which is connected with the cathode pole 10, wherein the specific control method is as follows:
1) an operational amplifier in the controller 13 is connected with an INB in the U2 to receive a signal of the temperature sensor 15, when the temperature sensor 15 detects that the temperature of the annular lithium ion battery monomer 100 is lower than-10 ℃, an OUTB output current in the U2, a CJ8820 is connected with the inner heating cylinder 1 and the outer heating cylinder 6 and starts to work to generate heat through the current, and the heat emitted by the annular lithium ion battery monomer 100 is cooperated with the heat emitted by the battery; when the temperature sensor 15 detects that the temperature of the annular lithium ion battery monomer 100 is 0 ℃ or above, OUTB in U2 does not output current, CJ8820 disconnects the inner heating cylinder 1 and the outer heating cylinder 6, and heat generation is stopped;
2) when the temperature of the annular lithium ion battery monomer 100 reaches the melting temperature of the phase change material 12, the internal and external phase change materials 12 begin to absorb heat to dissipate heat of the annular lithium ion battery monomer 100, and the phase change material 12 stops absorbing heat until the phase change material 12 is completely melted;
3) when the temperature of the annular lithium ion battery monomer 100 is above 0 ℃ and below the melting temperature of the phase change material 12, the annular lithium ion battery monomer 100 normally works.
The inner heating cylinder 1 and the outer heating cylinder 6 are made of iron-chromium-aluminum alloy with high thermal conductivity and high resistivity, the thermal conductivity is 52 KJ/m.h.c, and the resistivity is 1.6 x 10 < -6 > omega.m.
The phase-change material 12 is a fusion of 80% paraffin and 20% expanded graphite, and the heat conductivity coefficient is improved from 0.24. m-1. K-1 of single paraffin to 1.23. m-1·K-1And is 5 times of the thermal conductivity coefficient of single paraffin.
Claims (8)
1. The annular lithium ion battery pack with the heat management function comprises two annular lithium ion battery monomers which are mutually connected, and is characterized in that the annular lithium ion battery monomers comprise an inner heating cylinder, a cylindrical winding sheet, an electric core and a battery shell, wherein the inner heating cylinder is filled with a phase change material, the periphery of the inner heating cylinder is provided with the winding sheet, and the electric core is wound on the periphery of the winding sheet; the controller is arranged outside the battery shell, and the phase-change material is filled between the battery shell and the outer heating cylinder; the external heating barrel is sleeved on the periphery of the battery core; the lower end of the annular lithium ion battery monomer is packaged with a lower end cover, the upper end of the annular lithium ion battery monomer is packaged with an upper end cover, and the upper end cover is provided with a temperature sensor, a positive pole column and a negative pole column; the upper end of the battery core is connected with a lead positive plate and a lead negative plate, and the positive plate and the negative plate are respectively and correspondingly connected with a positive pole post and a negative pole post on the upper end cover; connecting seats are arranged on the upper end cover and the lower end cover of the annular lithium ion battery monomer, the connecting seats are quadrilateral, blocking pieces are arranged at the opposite angles of the port of the inner hole in the middle of the connecting seats, dovetail grooves are arranged at two adjacent sides of one side of each connecting seat, dovetail slide blocks correspondingly matched with the dovetail grooves are arranged at two adjacent sides of the other side of each connecting seat, and the annular lithium ion battery monomer is oppositely connected with the dovetail slide blocks through the dovetail grooves to form a battery pack; the anode pole column and the cathode pole column between the annular lithium ion battery monomers in the battery pack are correspondingly connected through the connecting sheet, so that the parallel connection electrification of the battery pack is realized.
2. The lithium ion battery pack with thermal management function of claim 1, wherein the material of the battery cell is paraffin wax.
3. The lithium ion battery pack with thermal management function of claim 2, wherein expanded graphite, foamed aluminum, foamed graphite, carbon fiber or aluminum particles can be added to the paraffin-based material.
4. The annular lithium ion battery pack with the thermal management function according to claim 1, wherein the temperature sensor has a temperature sensing range of-30-60 ℃.
5. The lithium ion battery pack with thermal management of claim 1, wherein the controller is configured with a first predetermined temperature and a second predetermined temperature.
6. The lithium ion battery pack with thermal management according to claim 5, wherein the first predetermined temperature is-10 ℃.
7. The lithium ion battery pack with thermal management according to claim 5, wherein the second predetermined temperature is 0 ℃.
8. The lithium ion battery pack with thermal management of claim 1, wherein the inner and outer heating cartridges are both made of high thermal conductivity and high electrical resistivity fe-cr-al alloy with a thermal conductivity of 52 KJ/m-h-c and an electrical resistivity of 1.6 x 10-6Ω·m。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121387217.4U CN214797540U (en) | 2021-06-22 | 2021-06-22 | Annular lithium ion battery pack with thermal management function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121387217.4U CN214797540U (en) | 2021-06-22 | 2021-06-22 | Annular lithium ion battery pack with thermal management function |
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| CN214797540U true CN214797540U (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023141979A1 (en) * | 2022-01-28 | 2023-08-03 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, electrical device, and battery cell manufacturing method and device |
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2021
- 2021-06-22 CN CN202121387217.4U patent/CN214797540U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023141979A1 (en) * | 2022-01-28 | 2023-08-03 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, electrical device, and battery cell manufacturing method and device |
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