CN-122007863-A - Device for disassembling power battery by electromagnetic induction heating

Abstract

The invention relates to the technical field of power battery disassembly, in particular to a device for disassembling a power battery by electromagnetic induction heating. The device comprises a clamping assembly, a magnetic induction heating module, a cooling loop module and a plurality of intelligent control modules, wherein a battery bottom plate is heated through a profiling induction coil to soften structural adhesive, meanwhile, the cooling loop protects a battery core from overheating, heating air gap uniformity, a liquid cooling plate circulation state and adhesive layer thermal resistance are monitored in real time, the ageing type of the structural adhesive is automatically judged, and heating power and cooling flow are dynamically adjusted to realize self-adaptive control. And after disassembly, the disassembly quality is evaluated according to the residual glue coverage rate and the deformation of the liquid cooling plate, and the preset working parameters are optimized when the residual glue coverage rate and the deformation of the liquid cooling plate are not up to standard. The invention solves the problems of safety, high efficiency and self-adaption nondestructive disassembly of the power battery under the condition of ageing of the structural adhesive property of the power battery pack.

Inventors

• DAI JINGYAN
• ZHAO XIQUN

Assignees

• 北京百通科信机械设备有限公司

Dates

Publication Date

20260512

Application Date

20260202

Claims (10)

1. 1. A power cell apparatus for disassembly using electromagnetic induction heating, comprising: The clamping assembly comprises a clamp used for clamping and positioning the power battery to be disassembled and the profiling induction heating coil; the magnetic induction heating module comprises a power generator and the profiling induction heating coil, and is used for controlling the profiling induction heating coil to heat the bottom plate under the condition that the power battery to be disassembled is determined to meet the standard to be disassembled; the cooling loop module is used for being connected in series with the liquid cooling plate of the power battery to be disassembled and comprises a cooling liquid inlet and a cooling liquid outlet, wherein the cooling liquid inlet and the cooling liquid outlet are used for enabling high-temperature cooling liquid to flow through the cooling loop module; The standard judging module is used for obtaining a horizontal air gap uniformity coefficient of the profiling induction heating coil positioned below the bottom plate and the bottom plate so as to determine whether the installation of the profiling induction heating coil meets a heating standard or not, and determining whether the circulation state of the liquid cooling plate meets the cooling requirement or not based on the serial liquid cooling plate circulation health index; The aging judgment module is used for obtaining the time required for heating the power battery to the softening point of the bottom plate after starting heating, determining whether the structural adhesive of the power battery to be disassembled is aged or not according to the thermal impedance coefficient of the adhesive layer, and determining the aging type of the structural adhesive according to the global temperature uniformity; the parameter regulation and control module is used for determining to increase the heating power, increase the flow of the cooling liquid and supplement the heating at fixed points according to the deviation degree of the thermal impedance of the adhesive layer and the local thermal impedance coefficient; The separation and disassembly module is used for obtaining the temperature value of the inlet and outlet of the liquid cooling plate, determining the internal temperature state of the power battery to be disassembled according to the load variation coefficient of the liquid cooling plate, and executing separation and disassembly; the disassembly evaluation optimization module is used for obtaining the residual glue coverage rate of the separation interface and the maximum deformation of the liquid cooling plate to determine whether the quality of single disassembly meets the standard or not so as to reduce the initial air gap and increase the flow of the cooling liquid under the condition that the quality does not meet the standard.
2. 2. The power battery device for disassembly using electromagnetic induction heating according to claim 1, further comprising a data acquisition module for acquiring bus voltage of the power battery to be disassembled, an air gap between the induction coil and the bottom plate, cooling liquid flow and pressure, temperature field data of the thermal infrared imager during disassembly, and residual glue image and liquid cooling plate shape data after disassembly.
3. 3. The power cell apparatus as claimed in claim 1, wherein the aging determination module is configured to determine that an aging phenomenon exists based on the thermal impedance coefficient of the adhesive layer being greater than a predetermined thermal impedance coefficient of the adhesive layer, in response to the magnetic induction heating module heating the base plate, to obtain a time required for heating to a softening point of the adhesive of the base plate after starting heating.
4. 4. The power cell apparatus as claimed in claim 3, wherein the aging determination module, in response to determining that an aging phenomenon exists, divides the overall temperature field data into a plurality of uniformly distributed evaluation areas and obtains a global temperature uniformity coefficient, and determines that the structural adhesive is aged to be fully uniform aging based on the global temperature uniformity coefficient being less than or equal to a preset global temperature uniformity coefficient.
5. 5. The apparatus for disassembly of power cells using electromagnetic induction heating of claim 4, wherein the aging determination module, in response to determining that an aging phenomenon exists, divides the overall temperature field data into a plurality of evenly distributed evaluation regions and obtains a global temperature uniformity coefficient, and determines that the structural adhesive ages to local aging based on the global temperature uniformity coefficient being greater than a preset global temperature uniformity coefficient.
6. 6. The power cell apparatus disassembled using electromagnetic induction heating of claim 1, wherein the parameter adjustment module, in response to the structural adhesive aging type being the overall uniformity aging, determines to boost the heating power of the contoured induction heating coil and increases the coolant flow of the cooling circuit module based on the offset of the thermal impedance of the adhesive layer from a first predetermined thermal impedance offset of the adhesive layer and from the second predetermined thermal impedance offset of the adhesive layer; the first preset adhesive layer thermal impedance deviation degree is smaller than the second preset adhesive layer thermal impedance deviation degree.
7. 7. The power cell apparatus as claimed in claim 6, wherein the parameter control module determines to raise heating power of the profile induction heating coil based on the local thermal impedance coefficient deviating from the preset local thermal impedance coefficient in response to the structural adhesive aging type being the local aging, and performs fixed point additional heating for a preset period of time.
8. 8. The power battery device for disassembling by electromagnetic induction heating according to claim 1, wherein the disassembly evaluation optimization module determines that the single disassembly quality does not reach the standard based on the comprehensive disassembly quality coefficient being smaller than a preset comprehensive disassembly quality coefficient in response to the separation disassembly module determining to perform separation disassembly, obtaining a residual glue coverage rate of a separation interface and a maximum deformation amount of a liquid cooling plate to determine the comprehensive disassembly quality coefficient.
9. 9. The power cell apparatus for disassembly using electromagnetic induction heating of claim 8, wherein the disassembly evaluation optimization module obtains an absolute difference of the integrated disassembly quality coefficient and a preset integrated disassembly quality coefficient in response to a single disassembly quality not meeting a standard, determines that a slight disassembly quality deviation exists based on the absolute difference being less than or equal to a preset absolute difference, and reduces an initial air gap of the contoured induction heating coil and the bottom plate.
10. 10. The apparatus for disassembly of power cells using electromagnetic induction heating of claim 9, wherein the disassembly evaluation optimization module obtains an absolute difference of the integrated disassembly quality coefficient and a preset integrated disassembly quality coefficient in response to a single disassembly quality not meeting a standard, determines that a serious disassembly quality deviation exists based on the absolute difference being greater than a preset absolute difference, reduces an initial air gap between the profiling induction heating coil and the bottom plate, and improves an initial coolant flow of the cooling circuit module.

Description

Device for disassembling power battery by electromagnetic induction heating Technical Field The invention relates to the technical field of power battery disassembly, in particular to a device for disassembling a power battery by electromagnetic induction heating. Background With the vigorous development of the new energy automobile industry, the retired tide of the power battery is coming, and the efficient recovery and echelon utilization of the power battery become key links for realizing green recycling economy. In the process, the power battery pack is safely and nondestructively disassembled, which is the basic premise of subsequent evaluation, recombination and recovery. In recent years, in order to improve energy density and simplify structure, a non-modularized technology such as CTP has been widely used in industry. The technology uses a large amount of high-strength structural adhesive, such as epoxy resin and polyurethane, to directly bond the battery core on the liquid cooling plate and the bottom guard plate of the battery pack, so that a high-strength integrated structure is formed. Although the design has remarkable advantages in terms of improving performance, the design brings unprecedented technical challenges for subsequent disassembly, maintenance and recovery: The mechanical method is easy to cause structural damage to parts such as the liquid cooling plate, the traditional thermal disassembly is low in efficiency, and the safety of the internal battery cell can be endangered due to integral heating. In addition, the existing device cannot adapt to performance fluctuation caused by ageing of structural adhesive, lacks a thermal management mechanism cooperated with a heating process in real time, and is difficult to realize efficient and nondestructive disassembly on the premise of ensuring safety. Therefore, an advanced disassembling device capable of overcoming the defects is highly needed in the field, the high-strength structural adhesive bonding interface is efficiently destroyed, the safety and the damage of internal elements of the battery pack, particularly the battery core, are absolutely ensured in the whole process, and the intelligent capability is provided for coping with the complex working conditions of the battery packs in different aging states. CN114669583a discloses a disassembling system for power battery and a control method of medium temperature thereof, belonging to the technical field of power battery disassembling device, 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 the bottom of the box body is provided with a cooling plate, the battery cells are adhered to the cooling plate through structural adhesive, a heating device is communicated with a water inlet and a water outlet of the cooling plate at the bottom of the battery cells and is used for introducing heating medium from an inlet of the cooling plate, the cooling device is communicated with a runner of a clamping device and is used for introducing cooling medium into the runner, the system can realize accurate disassembly of the battery cells, has high precision and high disassembly efficiency, can realize simultaneous disassembly of a plurality of battery cells, is convenient for industrialized and mass disassembly of batteries, improves the recycling rate of the power battery, and plays a positive role in developing, recycling and maintaining the power battery. Therefore, the dismantling system applied to the power battery and the medium temperature control method thereof have the problems that the dismantling efficiency of the power battery is low due to slow heat release caused by heating by introducing a heating medium into the cooling plate of the power battery, no specific measure is formulated for the aging phenomenon of the structural adhesive in the dismantling process, the overall stability state of the battery is not monitored in real time, the dismantling efficiency is low, and the safety of the dismantling process is reduced. Disclosure of Invention Therefore, the invention provides a device for disassembling a power battery by using electromagnetic induction heating, which is used for solving the problems that the high-efficiency and nondestructive disassembly of a bottom plate of a battery pack cannot be realized and the safety of core components in the battery pack is absolutely ensured under the actual conditions of inherent fluctuation of the structural adhesive performance and uncertain internal state of the power battery pack in the prior art. In order to achieve the above object, the present invention provides a power battery device that uses electromagnetic induction heating to disassemble. Comprising the following steps: The clamping assembly comprises a clamp used for clamping and positioning the power battery to be disassembled and the