CN-121983694-A - Magnetic induction heating process of power battery

CN121983694ACN 121983694 ACN121983694 ACN 121983694ACN-121983694-A

Abstract

The invention relates to the technical field of power batteries, in particular to a magnetic induction heating process of a power battery, which comprises the steps of obtaining the temperature of cooling media at a liquid inlet and a liquid outlet of a liquid cooling plate, determining the actual cooling heat quantity, judging the qualification of a softening effect, determining the heating time in response to the disqualification of the softening effect, judging the qualification of a battery core based on a reflux temperature value and a target temperature threshold value, determining the electromagnetic heating power in response to the disqualification of the battery core temperature, redetermining the flow of the cooling media based on the time when the reflux temperature value exceeds the target temperature threshold value, and determining to replace the cooling media supplied by a cooling system when the maximum flow of the cooling media is regulated and controlled to still not meet the requirements of the qualification of the battery core temperature.

Inventors

DAI JINGYAN
CHEN JIANHUI

Assignees

北京百通科信机械设备有限公司

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (10)

1. A magnetic induction heating process of a power battery is characterized by comprising the steps of, Raising the temperature to a target temperature interval according to a preset heating rate, and maintaining electromagnetic power to continuously heat the bottom plate so as to soften the structural adhesive; The cooling medium circulates the liquid cooling plate to isolate heat conduction with preset flow, the temperature of the cooling medium at the feed liquid inlet and the outlet of the liquid cooling plate is obtained to determine the actual cooling heat, the qualification of the softening effect is judged, the heating time is determined in response to the unqualified softening effect, and the flow of the cooling medium is regulated and controlled based on the fact that the heating time is independently regulated and controlled and the requirement of the qualification of the softening effect is not met; Determining the qualification of the battery cell temperature based on the reflux temperature value and the target temperature threshold value, determining electromagnetic heating power in response to the disqualification of the battery cell temperature, redefining the flow of the cooling medium based on the time when the reflux temperature value exceeds the target temperature threshold value, and determining to replace the cooling medium supplied by the cooling system when the maximum value of the flow of the cooling medium is regulated and controlled and still does not meet the qualification requirement of the battery cell temperature; Determining an actual adhesion ratio based on an adhesion image of the liquid cooling plate after the separation of the liquid cooling plate and the bottom plate, judging the qualification of the separation effect, and re-determining the subsequent heating time in response to the disqualification of the separation effect so as to determine to adjust the electromagnetic heating power based on the independent adjustment of the heating time when the disqualification requirement of the separation effect is not met; acquiring an adhesion image based on the disqualification condition of the separation effect to determine the actual gray level, judging the local heating qualification, and determining the complementary heat strategy; Determining the actual deformation rate based on the surface morphology and structural integrity data of the battery core after the battery is disassembled, judging the qualification of the heating process by the simultaneous total sum deviation parameter, determining the deformation type according to the surface morphology and structural integrity data of the battery core in response to the disqualification of the heating process, determining the levelness of the power battery again based on the deformation type as concentrated deformation, determining the target temperature interval again based on the deformation type as integral deformation, and determining the preset cooling heat interval again according to the disqualification condition of the temperature of the battery core; The sum deviation parameter is determined based on a first deviation value of an actual temperature value relative to a target temperature value, a second deviation value of an actual cooling heat quantity relative to a preset cooling heat quantity interval and a third deviation value of an actual heating time relative to a theoretical heating time.
2. The process for magnetically heating a power battery according to claim 1, wherein the process for determining eligibility of the softening effect comprises, Comparing the actual cooling heat with a preset cooling heat interval, and judging the qualification of the softening effect; and in response to the disqualification of the softening effect, determining the adjustment heating time based on the fact that the actual cooling heat quantity is larger than the maximum value of the preset cooling heat quantity interval, and determining the adjustment cooling medium flow based on the fact that the actual cooling heat quantity is smaller than the minimum value of the preset cooling heat quantity interval.
3. The power battery magnetic induction heating process according to claim 2, wherein the time variation of the adjustment heating time is positively correlated with a second deviation value of the actual cooling heat quantity relative to a preset cooling heat quantity interval, and the flow variation of the adjustment cooling medium flow quantity is positively correlated with the second deviation value.
4. The process of claim 2, wherein determining the eligibility of the cell temperature comprises, Obtaining a reflux temperature value of a cooling medium at a liquid cooling plate outlet, comparing the reflux temperature value with a target temperature threshold value, and judging the temperature qualification of the battery cell; And responding to the unqualified determination of the temperature of the battery cell, adjusting the electromagnetic heating power, re-determining a preset cooling heat interval based on the fact that the reflux temperature value exceeds the target temperature threshold value, and adjusting the flow of the cooling medium according to the re-determined preset cooling heat interval.
5. The process for magnetically heating a power battery according to claim 1, wherein the step of determining the eligibility of the separation effect comprises, Obtaining an adhesion image of the liquid cooling plate after the separation of the bottom plate, determining an actual adhesion ratio, comparing the actual adhesion ratio with a preset adhesion ratio, and judging the qualification of the separation effect; And responding to disqualification of the separation effect, regulating and controlling the heating time according to a first exceeding value of the actual adhesion ratio relative to the preset adhesion ratio, and re-determining the subsequent electromagnetic heating power by combining the current electromagnetic heating power and the target temperature interval when the independent regulation heating time does not meet the qualification requirement of the separation effect.
6. The process of claim 1, wherein determining the type of deformation comprises, Acquiring surface morphology and structural integrity data of the disassembled battery cell, determining an actual deformation rate, comparing the actual deformation rate with a preset deformation rate, and judging the qualification of the disassembly process; comparing the sum deviation parameter with a preset deviation threshold value based on the unqualified disassembling process, and determining the qualification of the heating process; the method comprises the steps of responding to unqualified heating process, determining deformation type according to surface morphology and structural integrity data of an electric core, determining levelness of a power battery according to concentrated deformation positions by taking the deformation type as concentrated deformation, determining a target temperature interval according to a second exceeding value of an actual deformation rate relative to a preset deformation rate by taking the deformation type as integral deformation, responding to the re-determined target temperature interval, and re-determining a preset cooling heat interval according to unqualified condition of the electric core temperature.
7. The process of claim 1, wherein determining the local heating eligibility and determining the supplemental heating strategy comprises, Comparing the actual gray level with a preset gray level, and judging the local heating qualification; And determining local heat compensation time according to the unqualified region based on the unqualified local heating condition, and determining local heat compensation temperature according to a third exceeding value of the actual gray scale of the unqualified region relative to the preset gray scale.
8. The power cell induction heating process of claim 7, wherein in response to determining the local supplemental temperature, the target temperature interval is adjusted according to setting a first correction value corresponding to the supplemental temperature, the first correction value being positively correlated with the local supplemental temperature.
9. The power cell induction heating process of claim 1, wherein in response to determining to replace the cooling medium supplied by the cooling system, the flow of the cooling medium is regulated in accordance with setting a second correction value corresponding to a volumetric heat capacity of the cooling medium, the second correction value being inversely proportional to the volumetric heat capacity.
10. The magnetic induction heating process of the power battery according to claim 1, wherein the actual safety factor is determined while the actual deformation rate is determined based on the surface morphology and structural integrity data of the battery after the battery is disassembled, the recovery safety qualification degree is determined by comparing the actual safety factor with a preset safety factor, and the battery is screened out for centralized treatment based on unqualified recovery safety.

Description

Magnetic induction heating process of power battery Technical Field The invention relates to the technical field of power batteries, in particular to a magnetic induction heating process of a power battery. Background The CTP technology directly integrates the battery cell into the battery pack by omitting a module structure, and realizes the adhesion and fixation of the battery module, the liquid cooling plate and the bottom guard plate by using a large amount of high-strength structural adhesive such as epoxy resin, polyurethane and the like, which brings the following disassembly challenges of mechanical risk, low thermal efficiency and long period of an integral oven heating method, irreversible thermal damage to internal elements such as the battery cell, the BMS, the wire harness and the like due to plastic deformation of the bottom plate and the liquid cooling plate caused by mechanical prying, and difficult realization of large-scale recycling requirements due to the fact that the traditional method relies on manpower and has low efficiency. CN115642331a discloses a disassembly method for a battery pack, which comprises the steps of determining the busbar size of the battery pack, adjusting the tool bit of an electric hand drill according to the busbar size, and controlling the electric hand drill to process welding spots on the busbar. According to the disassembly method, the proper electric hand drill bit is adjusted and selected according to the size of the battery busbar, and the electric hand drill is controlled to process welding spots on the busbar, so that the disassembly process is simple, the disassembly tool is easy to move and carry, the problems of complex disassembly process, large equipment volume, more occupied equipment space and the like are solved, and therefore, the disassembly method for the battery pack has the following problems: The softening effect of structural adhesive and the separation state of the liquid cooling plate and the bottom plate cannot be monitored, heating parameters and cooling strategies can be dynamically regulated and controlled, and accurate thermal management is realized so as to safely and accurately disassemble the battery pack. Disclosure of Invention Therefore, the invention provides a magnetic induction heating process of a power battery, which is used for solving the problems that the softening effect of structural adhesive and the separation state of a liquid cooling plate and a bottom plate cannot be monitored in the prior art, the heating parameters and the cooling strategy can be dynamically regulated and controlled, and the accurate thermal management is realized so as to safely and accurately disassemble a battery pack. In order to achieve the above object, the present invention provides a magnetic induction heating process for a power battery, comprising, Raising the temperature to a target temperature interval according to a preset heating rate, and maintaining electromagnetic power to continuously heat the bottom plate so as to soften the structural adhesive; The cooling medium circulates the liquid cooling plate to isolate heat conduction with preset flow, the temperature of the cooling medium at the feed liquid inlet and the outlet of the liquid cooling plate is obtained to determine the actual cooling heat, the qualification of the softening effect is judged, the heating time is determined in response to the unqualified softening effect, and the flow of the cooling medium is regulated and controlled based on the fact that the heating time is independently regulated and controlled and the requirement of the qualification of the softening effect is not met; Determining the qualification of the battery cell temperature based on the reflux temperature value and the target temperature threshold value, determining electromagnetic heating power in response to the disqualification of the battery cell temperature, redefining the flow of the cooling medium based on the time when the reflux temperature value exceeds the target temperature threshold value, and determining to replace the cooling medium supplied by the cooling system when the maximum value of the flow of the cooling medium is regulated and controlled and still does not meet the qualification requirement of the battery cell temperature; Determining an actual adhesion ratio based on an adhesion image of the liquid cooling plate after the separation of the liquid cooling plate and the bottom plate, judging the qualification of the separation effect, and re-determining the subsequent heating time in response to the disqualification of the separation effect so as to determine to adjust the electromagnetic heating power based on the independent adjustment of the heating time when the disqualification requirement of the separation effect is not met; acquiring an adhesion image based on the disqualification condition of the separation effect to determine the actual gray level, judging the l