CN114669583A - Disassembling system applied to power battery and medium temperature control method thereof - Google Patents
Disassembling system applied to power battery and medium temperature control method thereof Download PDFInfo
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- CN114669583A CN114669583A CN202210278355.1A CN202210278355A CN114669583A CN 114669583 A CN114669583 A CN 114669583A CN 202210278355 A CN202210278355 A CN 202210278355A CN 114669583 A CN114669583 A CN 114669583A
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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
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention discloses a power battery disassembling system and a medium temperature control method thereof, belonging to the technical field of power battery disassembling devices, and comprising a clamping device, a cooling device, a heating device and a fixing device; the power battery pack comprises a box body and at least one battery cell arranged in the box body, wherein a cooling plate is arranged at the bottom of the box body, and the battery cell is bonded on the cooling plate through structural adhesive; the heating device is communicated with a water inlet and a water outlet of a cooling plate at the bottom of the battery core, and a heating medium is introduced from an inlet of the cooling plate; the cooling device is communicated with the flow channel of the clamping device and is used for introducing a cooling medium into the flow channel; this system can realize accurate disassembling to electric core, and the precision is high, disassembles efficiently, and can realize disassembling simultaneously to a plurality of electric cores, and the battery is disassembled in industrialization, big batch of being convenient for, has improved power battery's recycle ratio, develops circulation recycle and maintenance to power battery and plays the positive role.
Description
Technical Field
The invention belongs to the technical field of power battery disassembling devices, and particularly relates to a disassembling system applied to a power battery and a control method of medium temperature of the disassembling system.
Background
After electric automobile's power battery reached life decommissioning, need disassemble its inside electric core and go on recycle, the CTP power battery scheme popular on the market at present bonds big module or electric core at the battery box to this reduces part quantity, promotes battery energy density, promotes electric automobile's continuation of the journey mileage, but in case the glue solidification, hardly disassembles module or electric core under the prerequisite of not destroying the power battery structure. This leads to two problems:
firstly, after the power battery system does not meet the use requirements of the electric automobile, the battery cell cannot be disassembled and recycled;
moreover, due to the difficulty in disassembly, once a certain battery cell in the power battery system breaks down, the whole power battery system cannot be repaired and scrapped easily.
Disclosure of Invention
In order to overcome a series of problems that the power battery is difficult to disassemble or can not be disassembled, so that the whole power battery system can not be repaired and scrapped and the like in the prior art, the invention provides a disassembling system applied to the power battery and a medium temperature control method thereof, which can disassemble a battery core bonded in a battery system, and realize the repairing of the power battery and the recycling of the battery core after the battery is retired.
The invention is realized by the following technical scheme:
a disassembly system applied to a power battery comprises a clamping device, a cooling device, a heating device and a fixing device;
the fixing device is used for fixing the power battery pack and preventing the clamping device from driving the whole power battery pack when pulling the battery core;
the power battery pack comprises a box body and at least one battery cell arranged in the box body, wherein a cooling plate is arranged at the bottom of the box body, and the battery cell is bonded on the cooling plate through structural adhesive;
the heating device is communicated with a water inlet and a water outlet of a cooling plate at the bottom of the battery core, a heating medium is introduced from an inlet of the cooling plate, and cooled liquid flows out from an outlet of the cooling plate to heat the structural adhesive;
the cooling device is communicated with the flow channel of the clamping device and is used for introducing a cooling medium into the flow channel to cool the battery cell so as to prevent the battery cell from being out of control due to overhigh temperature;
the clamping device comprises a moving device, a clamping device and a clamping jaw; the clamping device is connected with the clamping jaws and used for controlling the distance between the inner walls of the clamping jaws and providing a certain clamping force; the power source of the clamping device is pneumatic, hydraulic or worm and gear; the motion device is connected with the clamping device and moves horizontally in the front-back, left-right and up-down directions; and a flow passage is arranged in the clamping jaw and used for introducing cooling liquid.
Further, the structural adhesive is epoxy resin, polyurethane or acrylic acid.
Furthermore, the battery cell is a ternary lithium system or a lithium iron phosphate system, is in a square shape and has a length not exceeding 300 mm.
Further, the bonding strength of the structural adhesive is weakened when the temperature exceeds T1; the temperature of the battery core does not exceed T2, namely, thermal runaway cannot occur, wherein T2> T1.
Furthermore, the box body consists of side frames, a bottom plate and an internal longitudinal beam, a containing cavity for liquid to flow is formed in the bottom plate, and a medium can be introduced into the containing cavity to heat or cool the battery cell; side frames are arranged at the front end, the rear end, the left end and the right end of the bottom plate in parallel, a plurality of internal longitudinal beams are vertically arranged in the middle of the side frames, and a battery cell is arranged between each side frame and each internal longitudinal beam; the side frames at the left end and the right end are provided with a plurality of mounting holes for mounting the power battery pack on a vehicle and fixing the power battery pack when disassembling the battery core.
Furthermore, the side frames, the bottom plate, the inner longitudinal beams and the cooling plate are all made of aluminum, and liquid introduced into the heating device and the cooling device is water, oil or glycol solution.
Further, when the battery cell is at the installation position, the distance between the two ends of the battery cell and the side frame of the box body is not less than 3mm, and the battery cell is used for accommodating a clamping device of a disassembling system; the side frame and the internal longitudinal beam of the box body are shorter than the battery cell by no more than 100 mm.
Further, the cooling plate and the box body are connected through bolts, welded or bonded through structural glue.
Furthermore, the distance between the inner walls of the two clamping jaws is the same as the thickness of the battery cell, the upper half section of the outer wall of the clamping jaw is provided with an outward bending structure, and a flow passage is arranged on the bending structure and is used for being communicated with a cooling device and introducing a cooling medium; when the clamping device clamps the battery core, the lower half section of the clamping jaw is arranged in a gap between the battery core and the side frame of the box body, and the upper half section is arranged above the side frame of the box body and is not arranged in a gap between the battery core and the side frame.
On the other hand, the invention also provides a control method of the medium temperature applied to the disassembly system of the power battery, which comprises the following specific steps:
s1, confirming the temperature T1 when the battery core is thermally out of control and the temperature T2 when the structural adhesive bonding force is attenuated to a target value through tests;
s2, giving initial values to the temperature Twc of the cooling medium for heating the cooling device and the temperature Twh of the heating medium, wherein the initial values meet Twc < T1 and Twh > T2;
s3, calculating the heat flow Q from the heating medium to the cooling medium through the structural adhesive, the battery cell and the clamping device when the system reaches a steady state according to the following formula;
in the formula:
A1the area of the wall surface of the cooling medium flow passage in a single clamping device; k is a radical of 1The heat convection coefficient of the cooling medium in the clamping device and the clamping device is obtained by calculation based on the physical parameters, the flow and the flow channel section of the cooling liquid according to the basic theory of heat transfer science;
A2the contact area between a single clamping device and a clamped battery cell is increased; k is a radical of2The equivalent heat exchange coefficient between the clamping device and the battery cell is satisfied
；
In the formula: d2、λJThe thermal conductivity in the width and width directions of the holding device, respectively, |c、λlcThe heat conductivity coefficients of the length and the length direction of the battery cell are respectively;
A3the contact area between the clamped battery cell and the structural adhesive is defined; k is a radical of3The equivalent heat exchange coefficient between the battery cell and the structural adhesive is satisfied
；
In the formula: t is tG、λGThe heat conductivity coefficients of the structural adhesive in the thickness direction and the thickness direction are respectively;
A4the contact area between the structural adhesive below the clamped battery core and the battery water cooling plate is defined as the contact area; k is a radical of4The equivalent heat exchange coefficient between the structural adhesive and the water cooling plate is satisfied
；
In the formula: t is tP、λPThe heat conductivity coefficients of the water cooling plate in the thickness direction and the thickness direction are respectively;
A5the area of the wall surface of a cooling medium flow channel in a water cooling plate below the clamped electric core; k is a radical of5The heat convection coefficient of the heating medium in the water cooling plate and the water cooling plate can be obtained by calculation based on physical parameters, flow and flow channel section of the heating liquid according to the basic theory of heat transfer science;
s4, calculating the cell temperature T under the steady state CAnd temperature T of structural adhesiveG；
S5, judging whether the following conditions are met: t is2-TC＞α；
In the formula: alpha is a temperature safety coefficient and is taken according to experience; in this example, 5 is taken; if yes, the process proceeds to S6, otherwise, the process proceeds to S7;
s6, judging whether the following conditions are met: t isG-T1＞β；
In the formula: beta is a force attenuation temperature redundancy coefficient, and is taken according to experience;
if yes, the process proceeds to S8, otherwise, the process proceeds to S9;
s7: to T againwcAssigning a value, subtracting 2 from the original value by the new value, and entering S3;
s8: current Twc、TwhThe value of (2) meets the design requirement, and the calculation is finished;
s9: to T againwhAnd assigning a value, adding 2 to the new value on the basis of the original value, and entering S3.
Compared with the prior art, the invention has the following advantages:
(1) the disassembly system applied to the power battery can realize accurate disassembly of the battery cores, has high precision and high disassembly efficiency, can realize simultaneous disassembly of a plurality of battery cores, is convenient for industrialized and large-batch disassembly of the battery, improves the recovery rate of the power battery, and plays a positive role in carrying out recycling and maintenance on the power battery;
(2) the power battery disassembling system has small occupied area, can be matched with other mechanism equipment such as battery disassembling and recycling and the like, and has good applicability and flexibility.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a power battery pack applied to a disassembly system of a power battery according to the present invention;
FIG. 2 is an exploded view of a case and a cooling plate of the disassembly system for power batteries according to the present invention;
fig. 3 is a partial cross-sectional view of a disassembly system for a power battery according to the present invention;
fig. 4 is a schematic diagram of a disassembly system applied to a power battery according to the present invention;
FIG. 5 is a schematic view of a clamping principle of a disassembly system for power batteries according to the present invention;
fig. 6 is a schematic view of a jaw structure of a disassembly system applied to a power battery of the invention;
in the figure: the battery box comprises a box body 1, a battery cell 2, a side frame 3, a cooling plate 4, a clamping jaw 5, a flow channel 6,
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Example 1
As shown in fig. 4, the present embodiment provides a disassembly system applied to a power battery, which includes a clamping device, a cooling device, a heating device and a fixing device;
the clamping device is used for placing and clamping the battery cell in a gap between the battery cell and a side frame of the box body, and providing a certain clamping force, and the clamping device moves upwards after clamping the battery cell and detaches the battery cell; the fixing device is used for fixing the battery assembly at a certain position to prevent the clamping device from driving the whole power battery when pulling the battery core; the heating device is used for introducing hot liquid into the cooling plate at the bottom of the battery core to heat the structural adhesive; the cooling device is used for introducing a cold medium into the clamping device, and cooling the battery cell by means of contact of the clamping device and the battery cell, so that the phenomenon that the battery cell is too high in temperature and thermal runaway occurs is prevented.
As shown in fig. 1, a structure of a power battery pack is specifically described below, where the power battery pack includes a box body and at least one battery cell disposed in the box body, as shown in fig. 2, the power battery pack further includes a cooling plate, a cooling plate is disposed at the bottom of the box body, and the battery cell is bonded to the cooling plate through a structural adhesive;
the structural adhesive is epoxy resin, polyurethane or acrylic acid;
the battery cell is a ternary lithium system or a lithium iron phosphate system, is in a square shape and has a length not exceeding 300 mm;
the structural adhesive has the advantage that the bonding strength is weakened when the temperature exceeds T1; the temperature of the battery core does not exceed T2, namely, thermal runaway cannot occur, wherein T2> T1.
As shown in fig. 2, the structure of the box body is specifically described below, where the box body is composed of side frames, a bottom plate and internal longitudinal beams, and a containing cavity for liquid to flow is formed in the bottom plate, and a medium can be introduced into the containing cavity to heat or cool the battery cell; side frames are arranged at the front end, the rear end, the left end and the right end of the bottom plate in parallel, a plurality of internal longitudinal beams are vertically arranged in the middle of the side frames, and a battery cell is arranged between each side frame and each internal longitudinal beam; the side frames at the left end and the right end are provided with a plurality of mounting holes for mounting the power battery pack on a vehicle and fixing the power battery pack when disassembling the battery core.
When the battery cell is in the installation position, the distance between two ends of the battery cell and the side frame of the box body is not less than 3mm, and the battery cell is used for accommodating a clamping device of a disassembling system; the side frame and the inner longitudinal beam of the box body are shorter than the battery core by no more than 100 mm;
the side frame of the box body can be manufactured by a profile welding process, can be manufactured by cast aluminum, and can also be manufactured by other processes; the cooling plate can be manufactured by a stamping and brazing process, a blowing process, structural adhesive bonding or other processes; the connection process of the cooling plate and the box body can be bolt connection, welding, structural adhesive bonding or other processes.
The fixing device is used for fixing the power battery pack, the fixing mode can be bolt connection, and the fixing device can also be fixed through other tool fixtures and is used for preventing the clamping device from driving the whole power battery pack when the battery cell is pulled by the clamping device;
the heating device is communicated with a water inlet and a water outlet of a cooling plate at the bottom of the battery core, a heating medium is introduced from an inlet of the cooling plate, and the cooled medium flows out from an outlet of the cooling plate, so that the structural adhesive is heated, and the bonding strength of the structural adhesive is reduced;
As shown in fig. 5, the clamping device comprises a moving device, a clamping device and a clamping jaw; the clamping device is connected with the clamping jaws and used for controlling the distance between the inner walls of the clamping jaws and providing a certain clamping force; the power source of the clamping device is pneumatic, hydraulic or worm and gear; the movement device is connected with the clamping device, moves horizontally in the front-back, left-right and up-down directions, can rotate around the axis in the vertical direction, has a rotation angle of not less than 180 degrees, and can provide a directional force in the vertical direction, so that the clamping jaw can move upwards to detach the battery cell after clamping the battery cell; a flow passage is arranged in the clamping device and used for introducing cooling liquid;
and the cooling device is communicated with the flow channel of the clamping device and is used for introducing cooling liquid into the flow channel to cool the battery cell and prevent the battery cell from being out of control due to overhigh temperature.
The side frames, the bottom plate, the inner longitudinal beam and the cooling plate are all made of aluminum, and liquid introduced into the heating device and the cooling device is water, oil or glycol solution.
As shown in fig. 6, the structure of the clamping jaw is specifically described below, the distance between the inner walls of the two clamping jaws is the same as the thickness of the battery cell, an outward bending structure is arranged at the upper half section of the outer wall of the clamping jaw, and a flow channel is arranged on the bending structure and is used for communicating with a cooling device and introducing cooling liquid; when the clamping device clamps the battery core, the lower half section of the clamping jaw is arranged in a gap between the battery core and the side frame of the box body, and the upper half section is arranged above the side frame of the box body and is not arranged in a gap between the battery core and the side frame.
Example 2
The embodiment provides a disassembling method applied to a power battery, which can be used for disassembling an electric core bonded in a battery box body by using the battery disassembling system on the premise of not damaging the box body and the electric core structure, and specifically, by utilizing the characteristic that the bonding force of a structural adhesive can be attenuated at high temperature, hot liquid is firstly introduced into a cooling plate of the power battery, so that the temperature of the structural adhesive at the bottom of the electric core reaches a certain temperature, and the bonding force is attenuated; then clamping the battery cell by using a clamping device, and introducing cold liquid into the battery cell to cool the battery cell to prevent the battery cell from generating thermal runaway; the clamping device moves upwards after clamping the battery cell, and the battery cell is detached.
A disassembly method applied to a power battery comprises the following specific steps:
step 1: fixing the power battery pack on the fixing device;
step 2: contacting the clamping device with the cell to be disassembled;
and step 3: continuously introducing cold liquid into the clamping device to ensure that the cell temperature is lower than T2 and is always lower than T2 in the next step;
and 4, step 4: introducing hot liquid into a cooling plate of the power battery system, so that the temperature of the structural adhesive for bonding the battery cell exceeds T1, and the temperature of the battery cell does not exceed T1;
And 5: the clamping device clamps the battery core and moves upwards, and the battery core is detached.
Wherein, when the temperature exceeds T1, the bonding strength of the structural adhesive can be attenuated; the temperature of the battery core does not exceed T2, namely, thermal runaway cannot occur, wherein T2> T1.
Example 3
The embodiment provides a method for controlling the medium temperature of a power battery dismantling system, which comprises the following specific steps:
s1, confirming the temperature T1 when the thermal runaway temperature of the battery cell occurs and the temperature T2 when the structural adhesive bonding force is attenuated to a target value through tests;
s2, giving initial values to the temperature Twc of the cooling medium for heating the cooling device and the temperature Twh of the heating medium, wherein the initial values meet Twc < T1 and Twh > T2; the initial values in this embodiment are: twc ═ T1-5, Twh ═ T2+ 5;
s3, calculating the heat flow Q from the heating medium to the cooling medium through the structural adhesive, the battery cell and the clamping device when the system reaches a steady state according to the following formula;
in the formula:
A1the area of the wall surface of the cooling medium flow passage in a single clamping device; k is a radical of1The heat convection coefficient of the cooling medium in the clamping device and the clamping device is determined according to the basic theory of heat transfer scienceCalculating the physical parameters, flow and flow channel section of the cooling liquid;
A2the contact area between a single clamping device and a clamped battery cell is formed; k is a radical of 2The equivalent heat exchange coefficient between the clamping device and the battery cell is satisfied
；
In the formula: d is a radical of2、λJThe thermal conductivity coefficients of the clamping device in the width direction and the width direction respectivelyc、λlcThe heat conductivity coefficients of the length and the length direction of the battery cell are respectively;
A3the contact area between the clamped battery cell and the structural adhesive is defined as the contact area; k is a radical of formula3The equivalent heat exchange coefficient between the battery core and the structural adhesive is satisfied
；
In the formula: t is tG、λGThe heat conductivity coefficients of the structural adhesive in the thickness direction and the thickness direction are respectively;
A4the contact area between the structural adhesive below the clamped battery core and the battery water cooling plate is defined as the contact area; k is a radical of4The equivalent heat exchange coefficient between the structural adhesive and the water cooling plate is satisfied
；
In the formula: t is tP、λPThe heat conductivity coefficients of the water cooling plate in the thickness direction and the thickness direction are respectively;
A5the area of the wall surface of a cooling medium flow channel in a water cooling plate below the clamped electric core; k is a radical of5The heat convection coefficient of the heating medium in the water cooling plate and the water cooling plate can be obtained by calculation based on physical parameters, flow and flow channel section of the heating liquid according to the basic theory of heat transfer science;
s4, calculating the cell temperature T under the steady stateCAnd temperature T of structural adhesiveG；
S5, judging whether the following conditions are met: t is2-TC＞α；
In the formula: alpha is a temperature safety coefficient and is taken according to experience; in this example, 5 is taken; if yes, the process proceeds to S6, otherwise, the process proceeds to S7;
s6, judging whether the following conditions are met: t is G-T1＞β；
In the formula: beta is a force attenuation temperature redundancy coefficient, and is taken according to experience; in this example, β is 5.
If yes, the process proceeds to S8, otherwise, the process proceeds to S9;
s7: to T againwcAssigning a value, subtracting 2 from the original value by the new value, and entering S3;
s8: current Twc、TwhThe value of (2) meets the design requirement, and the calculation is finished;
s9: to T againwhAnd assigning a value, adding 2 to the new value on the basis of the original value, and entering S3. The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A disassembly system applied to a power battery is characterized by comprising a clamping device, a cooling device, a heating device and a fixing device;
the fixing device is used for fixing the power battery pack and preventing the clamping device from driving the whole power battery pack when pulling the battery core;
the power battery pack comprises a box body and at least one battery cell arranged in the box body, wherein a cooling plate is arranged at the bottom of the box body, and the battery cell is bonded on the cooling plate through structural adhesive;
the heating device is communicated with a water inlet and a water outlet of a cooling plate at the bottom of the battery core, a heating medium is introduced from an inlet of the cooling plate, and cooled liquid flows out from an outlet of the cooling plate to heat the structural adhesive;
the cooling device is communicated with the flow channel of the clamping device and is used for introducing a cooling medium into the flow channel to cool the battery cell so as to prevent the battery cell from being out of control due to overhigh temperature;
the clamping device comprises a moving device, a clamping device and a clamping jaw; the clamping device is connected with the clamping jaws and used for controlling the distance between the inner walls of the clamping jaws and providing a certain clamping force; the power source of the clamping device is pneumatic, hydraulic or worm and gear; the motion device is connected with the clamping device and moves horizontally in the front-back, left-right and up-down directions; and a flow passage is arranged in the clamping jaw and used for introducing cooling liquid.
2. The disassembly system for power batteries according to claim 1, wherein the structural adhesive is epoxy resin, polyurethane or acrylic.
3. The disassembly system applied to the power battery as claimed in claim 1, wherein the battery cell is of a ternary lithium system or a lithium iron phosphate system, and is in the shape of a square battery cell, and the length of the square battery cell does not exceed 300 mm.
4. The disassembly system for power batteries according to claim 1, wherein the structural adhesive has a weakening bonding strength when the temperature exceeds T1; the temperature of the battery core does not exceed T2, namely, thermal runaway cannot occur, wherein T2> T1.
5. The disassembly system applied to the power battery as claimed in claim 1, wherein the box body is composed of side frames, a bottom plate and internal longitudinal beams, the bottom plate is internally provided with a containing cavity for liquid to flow, and a medium can be introduced into the containing cavity to heat or cool the battery cell; side frames are arranged at the front end, the rear end, the left end and the right end of the bottom plate in parallel, a plurality of internal longitudinal beams are vertically arranged in the middle of the side frames, and a battery cell is arranged between each side frame and each internal longitudinal beam; the side frames at the left end and the right end are provided with a plurality of mounting holes for mounting the power battery pack on a vehicle and fixing the power battery pack when disassembling the battery core.
6. The disassembly system for power batteries according to claim 1, wherein the side frames, the bottom plate, the inner longitudinal beams and the cooling plate are made of aluminum, and the liquid introduced by the heating device and the cooling device is water, oil or glycol solution.
7. The disassembling system for the power battery of claim 1, wherein when the battery cell is in the installation position, a distance between two ends of the battery cell and a side frame of the box body is not less than 3mm, and the clamping device is used for accommodating a clamping device of the disassembling system; the side frame and the internal longitudinal beam of the box body are shorter than the battery core by no more than 100 mm.
8. The disassembly system for power batteries according to claim 1, wherein the cooling plate is connected with the box body through bolts, welding or structural glue.
9. The disassembling system for the power battery of claim 1, wherein the distance between the inner walls of the two clamping jaws is the same as the thickness of the battery cell, the upper half section of the outer wall of the clamping jaw is provided with an outward bending structure, and the bending structure is provided with a flow channel for communicating with a cooling device and introducing a cooling medium; when the clamping device clamps the battery core, the lower half section of the clamping jaw is arranged in a gap between the battery core and the side frame of the box body, and the upper half section is arranged above the side frame of the box body and is not arranged in a gap between the battery core and the side frame.
10. The method for controlling the medium temperature applied to the disassembly system of power batteries according to claim 1, comprises the following steps:
s1, confirming the temperature T1 when the battery core is thermally out of control and the temperature T2 when the structural adhesive bonding force is attenuated to a target value through tests;
s2, giving initial values to the temperature Twc of the cooling medium for heating the cooling device and the temperature Twh of the heating medium, wherein the initial values meet Twc < T1 and Twh > T2;
s3, calculating the heat flow Q from the heating medium to the cooling medium through the structural adhesive, the battery cell and the clamping device when the system reaches a steady state according to the following formula;
in the formula:
A1the area of the wall surface of the cooling medium flow passage in a single clamping device; k is a radical of1The heat convection coefficient of the cooling medium in the clamping device and the clamping device is obtained by calculation based on physical property parameters, flow and flow channel section of the cooling liquid according to the basic theory of heat transfer science;
A2the contact area between a single clamping device and a clamped battery cell is formed; k is a radical of2The equivalent heat exchange coefficient between the clamping device and the battery cell is satisfied
；
In the formula: d2、λJThe thermal conductivity in the width and width directions of the holding device, respectively, |c、λlcThe heat conductivity coefficients of the length and the length direction of the battery cell are respectively;
A3for connecting the clamped electric core with the structural adhesiveA contact area; k is a radical of3The equivalent heat exchange coefficient between the battery cell and the structural adhesive is satisfied
In the formula: t is tG、λGThe heat conductivity coefficients of the structural adhesive in the thickness direction and the thickness direction are respectively;
A4the contact area between the structural adhesive below the clamped battery core and the battery water cooling plate is defined as the contact area; k is a radical of4The equivalent heat exchange coefficient between the structural adhesive and the water cooling plate is satisfied
；
In the formula: t is tP、λPThe heat conductivity coefficients of the water cooling plate in the thickness direction and the thickness direction are respectively;
A5the area of the wall surface of a cooling medium flow channel in a water cooling plate below the clamped electric core; k is a radical of5The heat convection coefficient of the heating medium in the water cooling plate and the water cooling plate can be obtained by calculation based on physical parameters, flow and flow channel section of the heating liquid according to the basic theory of heat transfer science;
s4, calculating the cell temperature T under the steady stateCAnd temperature T of structural adhesiveG；
S5, judging whether the following conditions are met: t is2-TC＞α；
In the formula: alpha is a temperature safety coefficient and is taken according to experience; in this example, 5 is taken; if yes, the process proceeds to S6, otherwise, the process proceeds to S7;
s6, judging whether the following conditions are met: t isG-T1＞β；
In the formula: beta is a force attenuation temperature redundancy coefficient, and is taken according to experience;
if yes, the process proceeds to S8, otherwise, the process proceeds to S9;
s7: to T againwcAssigning a value, subtracting 2 from the original value by the new value, and entering S3;
s8: current Twc、TwhThe value of (2) meets the design requirement, and the calculation is finished;
s9: to T againwhAnd assigning a value, adding 2 to the new value on the basis of the original value, and entering S3.
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| CN114927810A (en) * | 2022-04-11 | 2022-08-19 | 中国第一汽车股份有限公司 | Multifunctional battery cover plate, cover plate thickness determination method and power battery system |
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