CTP battery pack disassembly method

Abstract

A CTP battery pack disassembly method includes: performing a pretreatment operation on the CTP battery pack to remove the upper cover, electronic control module, and shielding accessories; performing a discharge operation on the CTP battery pack after the pretreatment operation; automatically disconnecting the busbar connecting two adjacent battery cells in the CTP battery pack; heating the bottom of the CTP battery pack; flipping the CTP battery pack after the heating operation; and vibrating the flipped CTP battery pack to separate each battery cell from the CTP battery pack. The above-mentioned CTP battery pack disassembly method improves the disassembly efficiency and safety of the CTP battery pack when the worker disassembles the CTP battery pack.

Description

Technical Field

[0001] The present application relates to the technical field of battery recycling, and in particular to a CTP battery pack disassembly method. Background Art

[0002] With the continuous development of new energy technologies, power batteries, as an important component of new energy, have also experienced rapid growth, resulting in a growing market share for power batteries. CTP (Cell-to-Pack) battery packs are directly assembled from battery cells, eliminating the modules that wrap around the battery cells. This allows CTP battery packs to have more space for arranging the battery cells. Compared to battery packs containing battery modules, CTP battery packs have higher energy density, higher production efficiency, and lower manufacturing costs. Therefore, CTP battery packs have promising development prospects, and the number of CTP battery packs will continue to grow over time.

[0003] In real life, with the emergence of new energy vehicles in recent years, a large number of new energy vehicles have flooded the market and been purchased by consumers. It is foreseeable that in the next 3-5 years, due to the aging of the power batteries in new energy vehicles, new energy vehicle manufacturers will recycle the aged power batteries. At that time, a large number of retired power batteries will be produced, of which CTP battery packs will account for a significant share. The CTP battery pack includes a battery pack housing and multiple battery cells. The battery pack housing forms a receiving cavity. The multiple battery cells are spaced apart and connected to the battery pack housing. The multiple battery cells are fixed in the receiving cavity of the battery pack housing using structural adhesive, and then packaged to obtain the CTP battery pack.

[0004] At present, the staff adopts manual disassembly to disassemble the CTP battery pack. During the manual disassembly of the CTP battery pack, since each battery cell is fixed in the battery pack shell by structural adhesive, each battery cell is adhered to the inner wall of the battery pack shell. In order to separate each battery cell from the battery pack shell, the staff needs to repeatedly pry or hammer the connection between each battery cell and the inner wall of the battery pack shell to make each battery cell fall off from the inner wall of the battery pack shell. During the process of the staff disassembling the CTP battery pack, prying or hammering requires more physical strength of the staff, which makes the staff more likely to feel tired in the process of disassembling the CTP battery pack, resulting in a slower disassembly speed of the staff when disassembling the CTP battery pack, and further resulting in a lower disassembly efficiency of the staff when disassembling the CTP battery pack. Moreover, when the staff disassemble the CTP battery pack, prying or hammering will cause the relevant tools to directly act on each battery cell. The sharp parts of the relevant tools will cause each battery cell to be damaged or even ruptured, making it easier for the electrolyte in each battery cell to splash to the outside along the damaged or ruptured part under the force of prying or hammering. As a result, the electrolyte splashed to the outside is more likely to be contaminated by the staff's skin, causing the staff to feel uncomfortable, and thus making the disassembly safety of the staff less safe when disassembling the CTP battery pack. Summary of the Invention

[0005] Based on this, it is necessary to provide a CTP battery pack disassembly method that allows workers to have higher disassembly efficiency when disassembling the CTP battery pack and at the same time ensure better disassembly safety when disassembling the CTP battery pack.

[0006] A CTP battery pack disassembly method, comprising:

[0007] Perform pre-processing operations on CTP battery packs to remove the top cover, electronic control module and shielding accessories;

[0008] Performing a discharge operation on the CTP battery pack after completing the pretreatment operation;

[0009] Automatically disconnecting the busbar connecting two adjacent battery cells in the CTP battery pack;

[0010] Heating the bottom of the CTP battery pack;

[0011] Performing a flipping operation on the CTP battery pack after completing the heating operation;

[0012] A vibration operation is performed on the CTP battery pack after the flipping operation is completed, so as to separate each of the battery cells from the CTP battery pack.

[0013] In one embodiment, the steps of pre-processing the CTP battery pack include:

[0014] Fixing the CTP battery pack with a clamp so that the clamp and the CTP battery pack together form a combination;

[0015] Placing the assembly on a transmission crawler and controlling the transmission crawler to move at a predetermined linear speed;

[0016] Perform insulation testing on the CTP battery pack.

[0017] In one embodiment, the step of discharging the CTP battery pack after the pre-processing operation includes:

[0018] Performing voltage detection on the CTP battery pack;

[0019] The voltage detection data is obtained to determine whether to discharge the entire CTP battery pack, discharge the entire group, or discharge a single battery pack.

[0020] In one embodiment, the step of obtaining voltage detection data for determining whether to discharge the entire pack, the entire group, or the individual battery pack of the CTP battery pack includes:

[0021] Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value;

[0022] Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V;

[0023] If yes, use a discharge device to discharge the entire CTP battery pack for the first time, and discharge the entire pack for the first time until the first voltage detection value is less than or equal to the number of battery cells in series in the CTP battery pack multiplied by 3V;

[0024] Performing a static operation on the CTP battery pack after the first full pack discharge;

[0025] The discharge device is used to perform a second full-pack discharge on the CTP battery pack after it has been stationary for a period of time, and the second full-pack discharge is performed until the first voltage detection value is less than or equal to the number of battery cells in the CTP battery pack connected in series multiplied by 0.3V.

[0026] In one embodiment, the step of obtaining voltage detection data for determining whether to discharge the entire pack, the entire group, or the individual battery pack of the CTP battery pack includes:

[0027] Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value;

[0028] Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V;

[0029] If not, detecting the voltage between the positive electrode and the negative electrode of each battery group in the CTP battery pack to obtain a second voltage detection value;

[0030] Determining whether the second voltage detection value of each of the battery packs is greater than the number of battery cells connected in series in the battery pack multiplied by 3V;

[0031] If yes, use a discharge device to perform a first discharge on the entire battery pack, wherein the first discharge is performed until the second voltage detection value of the battery pack is less than or equal to the number of battery cells in series in the battery pack multiplied by 3V;

[0032] performing a static operation on the battery pack after the first full discharge;

[0033] The discharge device is used to perform a second discharge on the battery pack after it has been stationary for a period of time, and the second discharge is performed until the second voltage detection value is less than or equal to the number of battery cells in the battery pack connected in series multiplied by 0.3V.

[0034] In one embodiment, the step of obtaining voltage detection data for determining whether to discharge the entire pack, the entire group, or the individual battery pack of the CTP battery pack includes:

[0035] Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value;

[0036] Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V;

[0037] If not, detecting the voltage between the positive electrode and the negative electrode of each battery group in the CTP battery pack to obtain a second voltage detection value;

[0038] Determining whether the second voltage detection value of each of the battery packs is greater than the number of battery cells connected in series in the battery pack multiplied by 3V;

[0039] If not, detecting the voltage of each battery cell in each of the battery packs to obtain a third voltage detection value;

[0040] Determining whether the third voltage detection value of each battery cell is greater than 0.3V;

[0041] If so, a discharge device is used to discharge the battery cell until the third voltage detection value of the battery cell is less than or equal to 0.3V.

[0042] In one embodiment, the discharge device is electrically connected to a power grid or an energy storage device.

[0043] In one embodiment, the steps of heating the bottom of the CTP battery pack are specifically as follows:

[0044] An electromagnetic heating device is used to heat the bottom of the CTP battery pack.

[0045] In one embodiment, a heat insulation plate is provided between the electromagnetic heating device and the bottom of the CTP battery pack.

[0046] In one embodiment, the electromagnetic heating device includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is disposed at the bottom of the battery pack shell of the CTP battery pack, and the second temperature sensor is disposed on the surface of the battery cell.

[0047] In one embodiment, there are plural first temperature sensors and plural second temperature sensors, and the first temperature sensors and the second temperature sensors are distributed in a matrix.

[0048] In one embodiment, the discharge device is electrically connected to the energy storage device; and the energy storage device is electrically connected to the electromagnetic heating device.

[0049] In one embodiment, the step of automatically disconnecting the busbar connecting two adjacent battery cells in the CTP battery pack includes:

[0050] Generate busbar cutting processing path;

[0051] A cutting device is used to automatically cut off the busbar connecting two adjacent battery cells in the CTP battery pack along the busbar cutting processing path.

[0052] In one embodiment, the cutting device is provided with a visual scanning structure, the visual scanning structure is electrically connected to the control device, and the step of generating the busbar cutting processing path includes:

[0053] Using the visual scanning structure to capture an image of the bus to obtain image data of the bus;

[0054] The control device is used to perform calculation processing on the image data of the bus bar to generate the bus bar cutting processing path.

[0055] In one embodiment, the step of using the control device to perform calculation processing on the image data of the bus to generate the bus cutting processing path includes:

[0056] Using the control device to perform calculation processing on the image data of the busbar to obtain the welding point position and the welding point height of the busbar;

[0057] The control device is used to generate the busbar cutting processing path according to the welding point position and the welding point height of the busbar.

[0058] Compared with the prior art, the present invention has at least the following advantages:

[0059] Due to the heating operation on the bottom of the CTP battery pack, the temperature of the bottom of the CTP battery pack rises, that is, the temperature of the bottom of the battery pack shell rises, so that the structural adhesive at the bottom of the battery pack shell gradually softens under the heat, so that the viscosity of the structural adhesive at the bonding point between each battery cell and the inner wall of the bottom of the battery pack shell gradually becomes lower or even fails, thereby reducing the bonding strength between each battery cell and the inner wall of the bottom of the battery pack shell. Then, the CTP battery pack is turned over and the bottom of the CTP battery pack is vibrated, that is, the bottom of the battery pack shell is vibrated, thereby applying a downward vibration force to the bottom of the battery pack shell, so that when the bonding strength between each battery cell and the inner wall of the bottom of the battery pack shell is reduced, the position of each battery cell in the battery pack shell is loose, so that under the combined action of the gravity of each battery cell and the downward vibration force, each battery cell is easier to fall off from the battery pack shell, thereby accelerating the bonding between the battery cell and the battery pack shell. The separation speed makes it easier for each battery cell to be separated from the battery pack shell, thereby solving the problem that the staff needs to repeatedly pry or hammer the connection between each battery cell and the inner wall of the battery pack shell during the disassembly of the CTP battery pack. In addition, heating and vibration work together to replace prying or hammering to make each battery cell fall off from the inner wall of the battery pack shell. In the process of disassembling the CTP battery pack, the heating and vibration methods do not need to be completed by the staff, thereby avoiding the problem that the staff needs to consume more physical strength in the process of disassembling the CTP battery pack, thereby solving the problem that the staff is more likely to feel tired in the process of disassembling the CTP battery pack, making the labor intensity of the staff lower when disassembling the CTP battery pack, thereby making the staff disassembly speed faster when disassembling the CTP battery pack, and thereby making the staff disassembly efficiency higher when disassembling the CTP battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0061] Figure 1 FIG. 1 is a flow chart of a CTP battery pack disassembly method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0062] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present application. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this application belongs. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items.

[0063] See also Figure 1 , the present application provides a CTP battery pack disassembly method. In order to better understand the CTP battery pack disassembly method of the present application, the following further explains the CTP battery pack disassembly method of the present application:

[0064] The CTP battery pack disassembly method of an embodiment is used to disassemble the CTP battery pack, so that the staff can disassemble the CTP battery pack with high efficiency and high safety. Figure 1 As shown, further, the CTP battery pack disassembly method includes some or all of the following steps:

[0065] S101, performing pre-processing operations on the CTP battery pack to remove the upper cover, the electronic control module and the shielding accessories.

[0066] The tool is used to remove the top cover, electronic control module, and shielding accessories, exposing the battery cells and busbars within the CTP battery pack. This facilitates the disassembly of the battery cells and the severing of the busbars between adjacent battery cells, making the CTP battery pack more convenient to disassemble. Furthermore, the exposed busbars make it easier for workers to perform insulation protection operations on the busbars.

[0067] S103, performing a discharge operation on the CTP battery pack after the pre-processing operation is completed.

[0068] Among them, the CTP battery pack is discharged after the pretreatment operation, so that the residual electricity in the CTP battery pack is released through the discharge operation, thereby reducing the residual electricity in the CTP battery pack, reducing the risk of fire and explosion of the CTP battery pack when the staff disassembles the CTP battery pack, and thus making the disassembly safety of the CTP battery pack better during the staff's disassembly process.

[0069] S105 , automatically cutting off the busbar connecting two adjacent battery cells in the CTP battery pack.

[0070] Among them, the busbar connecting two adjacent battery cells in the CTP battery pack is automatically cut off, so that the two adjacent battery cells are disconnected, making it easier for staff to disassemble the battery cells.

[0071] S107: Heating the bottom of the CTP battery pack.

[0072] Among them, the bottom of the CTP battery pack is heated, so that the temperature of the bottom of the CTP battery pack rises rapidly, and the structural adhesive between the battery cell and the battery pack shell is softened when heated, so that the structural adhesive between the battery cell and the battery pack shell is more likely to fail, thereby reducing the viscosity of the structural adhesive between the battery cell and the battery pack shell, and thus enabling the battery cell to be better separated from the battery pack shell.

[0073] S109, performing a flipping operation on the CTP battery pack after the heating operation is completed.

[0074] The CTP battery pack after the heating operation is flipped over 180 degrees so that the bottom of the CTP battery pack faces upward and the opening of the battery pack shell faces downward, so as to facilitate the removal of the battery cell from the battery pack shell.

[0075] S111 , performing a vibration operation on the CTP battery pack after the flipping operation is completed, so as to separate each of the battery cells from the CTP battery pack.

[0076] Among them, the CTP battery pack is vibrated after the flipping operation is completed, that is, the bottom of the CTP battery pack is vibrated so that the bottom of the CTP battery pack is subjected to vibration force. When the structural adhesive is softened, the vibration makes it easier for the battery cell to fall off from the battery pack shell, thereby causing the battery cell to fall out of the battery pack shell.

[0077] The above-mentioned CTP battery pack disassembly method heats the bottom of the CTP battery pack, thereby increasing the temperature of the bottom of the CTP battery pack, that is, increasing the temperature of the bottom of the battery pack shell, so that the structural adhesive at the bottom of the battery pack shell gradually softens under the heat, so that the viscosity of the structural adhesive at the bonding point between each battery cell and the inner wall of the bottom of the battery pack shell gradually decreases or even fails, thereby reducing the bonding strength between each battery cell and the inner wall of the bottom of the battery pack shell. Subsequently, the CTP battery pack is turned over and the bottom of the CTP battery pack is vibrated, that is, the bottom of the battery pack shell is vibrated, thereby applying a downward vibration force to the bottom of the battery pack shell, so that when the bonding strength between each battery cell and the inner wall of the bottom of the battery pack shell is reduced, the position of each battery cell in the battery pack shell is loose, so that under the combined action of the gravity of each battery cell and the downward vibration force, each battery cell is easier to fall off from the battery pack shell, thereby accelerating the bonding between the battery cell and the inner wall of the bottom of the battery pack shell. The separation speed between the battery pack shells makes it easier for each battery cell to be separated from the battery pack shell, thereby solving the problem that the staff needs to repeatedly pry or hammer the connection between each battery cell and the inner wall of the battery pack shell during the disassembly of the CTP battery pack. In turn, heating and vibration work together to replace prying or hammering to make each battery cell fall off from the inner wall of the battery pack shell. In the process of disassembling the CTP battery pack, the heating and vibration methods do not need to be completed by the staff, thereby avoiding the problem of consuming more physical strength of the staff in the process of disassembling the CTP battery pack, thereby solving the problem that the staff is more likely to feel tired in the process of disassembling the CTP battery pack, making the labor intensity of the staff lower when disassembling the CTP battery pack, thereby making the staff disassembly speed faster when disassembling the CTP battery pack, thereby making the staff disassembly efficiency higher when disassembling the CTP battery pack.

[0078] In one embodiment, step S101 of pre-processing a CTP battery pack includes: securing the CTP battery pack with a fixture so that the fixture and the CTP battery pack together form a combination; placing the combination on a conveyor belt and controlling the conveyor belt to move at a predetermined linear velocity; and performing an insulation test on the CTP battery pack. In this embodiment, the fixture is an aluminum alloy structure, and the combination is formed by combining the fixture and the CTP battery pack. The conveyor belt is controlled to move at a predetermined linear velocity, that is, the conveyor belt drives the combination to move at the predetermined linear velocity. The CTP battery pack is subjected to an insulation tester to perform insulation testing on the CTP battery pack to inspect the state of the CTP battery pack, thereby ensuring that the state of the CTP battery pack is more stable during disassembly.

[0079] In one embodiment, step S103 of discharging the CTP battery pack after the pretreatment operation includes: S103A, performing voltage detection on the CTP battery pack; S103B, obtaining voltage detection data for determining whether to discharge the entire CTP battery pack, the entire group, or a single cell. In this embodiment, a voltage tester is used to detect the voltage of the CTP battery pack. The value of the voltage tester is the voltage detection data. The operator discharges the entire CTP battery pack, the entire group, or a single cell according to the value of the voltage tester, which provides the operator with greater operational flexibility when disassembling the CTP battery pack.

[0080] Furthermore, in one embodiment, step S103B of obtaining voltage detection data for determining whether to discharge the CTP battery pack as a whole, as a group, or as a single cell includes: S103B1, detecting the voltage between the positive and negative electrodes of the CTP battery pack to obtain a first voltage detection value; S103B2, determining whether the first voltage detection value is greater than the number of battery cells in series in the CTP battery pack multiplied by 3V; S103B3, if so, using a discharge device to perform a first full-pack discharge on the CTP battery pack, the first full-pack discharge being performed until the first voltage detection value is less than or equal to the number of battery cells in series in the CTP battery pack multiplied by 3V; S103B4, performing a static operation on the CTP battery pack after the first full-pack discharge; S103B5, using the discharge device to perform a second full-pack discharge on the CTP battery pack after it has been stationary for a period of time, the second full-pack discharge being performed until the first voltage detection value is less than or equal to the number of battery cells in series in the CTP battery pack multiplied by 0.3V. In this embodiment, the rest period ranges from 10 minutes to 30 minutes, and the discharge device is electrically connected to the power grid or energy storage device so that the residual power in the CTP battery pack is fed back to the power grid or energy storage device through the discharge device. Furthermore, when the CTP battery pack is discharged for the first time, the positive and negative electrodes of the CTP battery pack are electrically connected to the discharge connection lines of the discharge device to form a first full-pack discharge loop, so that the residual power of the CTP battery pack is fed back to the power grid through the discharge device. Moreover, the discharge device can also be used to electrically connect to the energy storage device so that the residual power of the CTP battery pack can also be fed back to the energy storage device through the discharge device. The energy storage device is used to provide the power required by the heating device, so that the residual power of the CTP battery pack can be reused, thereby improving energy utilization and reducing energy waste.

[0081] After the CTP battery pack is allowed to stand for the first time after the whole pack discharge, a discharge device is used to perform a second whole pack discharge on the CTP battery pack after standing for a period of time, so as to realize the cascade discharge of the CTP battery pack. During the cascade discharge of the CTP battery pack, the temperature of the battery monomers during the first whole pack discharge is not high, so that the temperature of the battery monomers is safe and controllable. The standing operation is conducive to cooling the battery monomers, so that the CTP battery pack has been fully cooled during the second whole pack discharge, so that the temperature of the battery monomers during the second whole pack discharge is not high either, so that the temperature of the battery monomers is safe and controllable, thereby effectively reducing the probability of risks such as bulging, fire and explosion of the battery monomers, so that the staff has better disassembly safety when disassembling the CTP battery pack.

[0082] In another embodiment, step S103B of obtaining voltage detection data for determining whether to discharge the entire pack, the entire group, or the single cell of the CTP battery pack includes: S103B1, detecting the voltage between the positive and negative electrodes of the CTP battery pack to obtain a first voltage detection value; S103B2, determining whether the first voltage detection value is greater than the number of battery cells in series in the CTP battery pack multiplied by 3V; S103B6, if not, detecting the voltage between the positive and negative electrodes of each battery group in the CTP battery pack to obtain a second voltage detection value; S103B7, determining whether the second voltage detection value of each battery group is greater than The number of battery cells connected in series in the battery pack is multiplied by 3V; S103B8, if yes, the battery pack is discharged for the first time using a discharge device, the first discharge being performed until the second voltage detection value of the battery pack is less than or equal to the number of battery cells connected in series in the battery pack multiplied by 3V; S103B9, the battery pack is allowed to stand after the first discharge; S103B10, the battery pack is discharged for the second time using the discharge device after the standstill period, the second discharge being performed until the second voltage detection value is less than or equal to the number of battery cells connected in series in the battery pack multiplied by 0.3V. In this embodiment, the standstill period ranges from 10 minutes to 30 minutes, and the discharge device is electrically connected to the power grid or energy storage device so that the residual power of each battery pack in the CTP battery pack is fed back to the power grid or energy storage device through the discharge device. Furthermore, when each battery pack in the CTP battery pack is discharged as a whole for the first time, the positive and negative electrodes of the battery pack are electrically connected to the discharge connection lines of the discharge device, respectively, to form a first complete discharge loop, so that the residual power of the battery pack is fed back to the grid through the discharge device. Moreover, the discharge device can also be used to be electrically connected to the energy storage device, so that the residual power of the battery pack can also be fed back and stored in the energy storage device through the discharge device. The energy storage device is used to provide the power required by the heating device, so that the residual power of the battery pack can be reused, thereby improving energy utilization and reducing energy waste.

[0083] After the battery pack is allowed to stand for the first time after the whole-group discharge, a discharge device is used to perform a second whole-group discharge on the battery pack after standing for a period of time, so as to realize the cascade discharge of the battery pack. During the cascade discharge of each battery pack, the temperature rise of the battery cells during the first whole-group discharge is not high, so that the temperature of the battery cells is safe and controllable. The standing operation is conducive to cooling the battery cells, so that during the second whole-group discharge, each battery pack has been fully cooled, so that the temperature rise of the battery cells during the second whole-group discharge is not high, so that the temperature of the battery cells is safe and controllable, and thus the probability of risks such as bulging, fire and explosion of the battery cells can be effectively reduced, so that the staff can better disassemble the CTP battery pack.

[0084] In another embodiment, step S103B of obtaining voltage detection data for determining whether to discharge the entire pack, group, or single cell of the CTP battery pack includes: S103B1, detecting the voltage between the positive and negative electrodes of the CTP battery pack to obtain a first voltage detection value; S103B2, determining whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V; S103B6, if not, detecting the voltage between the positive and negative electrodes of each battery group in the CTP battery pack to obtain a second voltage detection value; S103B7: Determine whether the second voltage detection value of each battery pack is greater than the number of battery cells connected in series within the battery pack multiplied by 3V. S103B11: If not, detect the voltage of each battery cell in each battery pack to obtain a third voltage detection value. S103B12: Determine whether the third voltage detection value of each battery cell is greater than 0.3V. S103B13: If so, use a discharge device to discharge the battery cells until the third voltage detection value of the battery cells is less than or equal to 0.3V. In this embodiment, the discharge device is electrically connected to the power grid or energy storage device so that the residual power of the battery cells is fed back to the power grid or energy storage device through the discharge device. Furthermore, when the battery cell is discharged, the positive and negative electrodes of the battery cell are respectively electrically connected to the discharge connection lines of the discharge device to form a single-cell discharge circuit, so that the residual power of the battery cell is fed back to the power grid through the discharge device. Moreover, the discharge device can also be used to be electrically connected to the energy storage device, so that the residual power of the battery cell can also be fed back and stored in the energy storage device through the discharge device. The energy storage device is used to provide the power required by the heating device, so that the residual power of the battery cell can be reused, thereby improving energy utilization and reducing energy waste.

[0085] In one embodiment, if the third voltage detection value of the battery cell is less than or equal to 0.3V, there is no need to perform a cell discharge operation on the battery cell.

[0086] In one embodiment, the first whole pack discharge, the second whole pack discharge, the first whole group discharge, the second whole group discharge and the single cell discharge in the CTP battery pack disassembly method do not need to communicate with the BMS (BATTERY MANAGEMENT SYSTEM) module of the CTP battery pack. The staff only needs to detect the voltage between the positive and negative electrodes of the CTP battery pack and obtain the first voltage detection value, so that they can determine whether the CTP battery pack meets the conditions for whole pack discharge. First, the CTP battery pack is discharged for the first time. The first full-pack discharge discharges the CTP battery pack to the number of battery cells connected in series multiplied by 3V. At this time, the residual power of the CTP battery pack is controlled between 8 and 15%; secondly, the CTP battery pack that has undergone the first full-pack discharge is allowed to stand for 10 to 30 minutes; then the second full-pack discharge is performed again. The second full-pack discharge discharges the CTP battery pack to the first voltage detection value less than or equal to the number of battery cells connected in series in the CTP battery pack multiplied by 0.3V. At this time, the residual power of the CTP battery pack is controlled between 2 and 5%; the staged discharge can effectively avoid safety problems such as bulging of battery cells and damage to safety valves during over-discharge; moreover, when individual battery cells in the CTP battery pack are micro-short-circuited, resulting in inconsistency between voltage and residual power, the battery cells will not cause thermal runaway due to over-discharge, so that the CTP battery pack has better safety performance during discharge.

[0087] Furthermore, for CTP battery packs that cannot meet the discharge requirements of the entire pack, voltage detection is performed on each battery cell and each battery group to sort out the battery cells that are open or short-circuited, and the discharge operation is skipped over the battery cells that are open or short-circuited. This ensures that when the CTP battery pack is subsequently disassembled in detail, there will be no uncontrollable risks due to operational errors, thereby ensuring better disassembly safety for workers during the process of disassembling the CTP battery pack.

[0088] In another embodiment, the staff first detects all battery cells in the entire CTP battery pack to determine whether there are any open-circuited or short-circuited battery cells. If so, the staff confirms that the open-circuited or short-circuited battery cells are located in the corresponding battery group. The staff divides the battery group into a faulty battery group and a normal battery group. The faulty battery group is a battery group with open-circuited or short-circuited battery cells, and the normal battery group is a battery group without open-circuited or short-circuited battery cells. Then, a discharge device is used to discharge the normal battery group as a whole, and then a discharge device is used to discharge each battery cell of the faulty battery group.

[0089] In one embodiment, the discharge device is electrically connected to the power grid or the energy storage device, so that the power of the first whole pack discharge, the power of the second whole pack discharge, the power of the first whole group discharge, the power of the second whole group discharge and the power of the single cell discharge can all be fed back to the power grid or the energy storage device through the discharge device, so that the CTP battery pack disassembly method has a higher utilization rate for the extraction of residual power.

[0090] In one embodiment, step S107 of heating the bottom of the CTP battery pack is specifically: heating the bottom of the CTP battery pack using an electromagnetic heating device. In this embodiment, the electromagnetic heating device is an electromagnetic heater. The present application adopts an electromagnetic heating method to heat the bottom of the CTP battery pack without flame. Since the main material component of the battery pack shell of the CTP battery pack is iron, it can produce a battery induction phenomenon, causing the bottom of the battery pack shell to be instantly heated to a high temperature. Since the bottom of the battery cell is fixed to the battery pack shell by structural adhesive, the viscosity failure temperature of the structural adhesive is 200-300°C. When the electromagnetic heater heats the bottom of the battery pack shell, the temperature of the battery pack shell rises rapidly, causing the viscosity of the surface of the structural adhesive in contact with it to fail.

[0091] Furthermore, an electromagnetic heating device is used to heat the bottom of the CTP battery pack, i.e., flameless electromagnetic heating is used to heat the bottom of the battery pack shell, improving the safety of battery pack disassembly. To avoid safety risks caused by localized high temperatures, the electromagnetic heating device is used to heat the bottom of the CTP battery pack as follows: the electromagnetic heating device heats for 5 to 6 minutes. During the heating process, the area of ​​the electromagnetic heating coil is larger than the bottom area of ​​the battery pack shell, so that the bottom of the battery pack shell is heated in all directions and all positions within the battery pack shell are heated evenly, thereby accelerating the failure and softening of the structural adhesive.

[0092] Furthermore, the electromagnetic heating device includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at the bottom of the battery pack shell of the CTP battery pack, and the second temperature sensor is disposed on the surface of the battery cell. The first temperature sensor is used to detect the temperature of the bottom of the battery pack shell, thereby controlling the temperature of the bottom of the battery pack shell to 400°C to 600°C. Furthermore, the second temperature sensor is used to measure the surface temperature of the battery cell, thereby controlling the surface temperature of the battery cell to below 70°C. The provision of the first and second temperature sensors can not only soften the structural adhesive at the bottom of the battery pack shell, but also control the temperature of the battery cell within a safe range, thereby improving the safety of workers when disassembling the CTP battery pack. In one embodiment, there are multiple first and second temperature sensors, and the first and second temperature sensors are distributed in a matrix, which can comprehensively control the temperature of the bottom of the battery pack shell and the surface of the battery cell.

[0093] In one embodiment, a heat shield is provided between the electromagnetic heating device and the bottom of the CTP battery pack. In this embodiment, the heat shield is used to isolate heat transfer between the bottom of the CTP battery pack and the electromagnetic heating device, thereby increasing the service life of the electromagnetic heating device.

[0094] In one embodiment, the discharge device is electrically connected to the energy storage device, and the energy storage device is electrically connected to the electromagnetic heating device, so that the energy storage device is used to provide the power required by the heating device, so that the residual power of the CTP battery pack is stored in the energy storage device and can be reused, thereby improving energy utilization and reducing energy waste.

[0095] In one embodiment, step S105 of automatically cutting off the busbar connecting two adjacent battery cells in the CTP battery pack includes: generating a busbar cutting processing path; and automatically cutting off the busbar connecting two adjacent battery cells in the CTP battery pack along the busbar cutting processing path using a cutting device. In this embodiment, the cutting device uses a metal cutting blade to adaptively cut the busbar. A mechanical hard limit assembly is provided at the bottom of the metal cutting blade to ensure that the cutting device can safely disconnect the busbar between two adjacent battery cells in the battery pack during cutting, thereby completing the automatic cutting operation of the busbar connecting the two adjacent battery cells, thereby improving the disassembly efficiency of the CTP battery pack by the staff. Since there is no need to finely mill the busbar, the cutting accuracy requirements for the cutting device are relatively low, which makes the cutting processing efficiency of the busbar higher.

[0096] In order to improve the stability of battery pack disassembly, before step S105 of automatically cutting off the busbar connecting two adjacent battery cells in the CTP battery pack, the CTP battery pack disassembly method further includes: performing step-by-step discharge on the CTP battery pack, so that the CTP battery pack disassembly method is more stable and reliable.

[0097] However, when the cutting device cuts the bus, debris will be generated, and the debris will fall onto the transmission belt and affect the transmission reliability of the transmission belt. In order to improve the transmission reliability of the transmission belt, the step S105 of automatically cutting off the bus connecting two adjacent battery cells in the CTP battery pack specifically includes: automatically cutting off the bus connecting two adjacent battery cells in the CTP battery pack, and automatically collecting the debris by a vacuum cleaner, without the need for staff to clean it, so that the labor intensity of the staff is low and the transmission reliability of the transmission belt is improved.

[0098] In one embodiment, the cutting device is provided with a visual scanning structure, which is electrically connected to a control device. The step of generating a busbar cutting processing path includes: using the visual scanning structure to capture an image of the busbar to obtain image data of the busbar; and using the control device to perform calculations on the busbar image data to generate the busbar cutting processing path. In this embodiment, the visual scanning structure is used to capture an image of the busbar to obtain image data of the busbar; then the control device performs calculations on the busbar image data to determine the location and height of the busbar's solder joints, thereby achieving positioning of the busbar, thereby ensuring a high degree of busbar positioning accuracy.

[0099] Furthermore, in one embodiment, the control device is used to perform calculations on the image data of the bus to generate the bus cutting processing path, including the steps of: using the control device to perform calculations on the image data of the bus to obtain the weld point position of the bus and the weld point height of the bus; using the control device to generate the bus cutting processing path according to the weld point position of the bus and the weld point height of the bus. In this embodiment, a visual scanning structure is used to capture images of the bus to obtain image data of the bus; then the control device performs calculations on the image data of the bus to obtain the welding point position and welding point height of the bus to achieve positioning of the bus, and then communicates with the robot PCL (Point Cloud Library) system to automatically generate a mechanical processing path; since the sizes and heights of battery cells in different types of CTP battery packs are inconsistent, the welding shapes of the bus are also different, which has a serious impact on the mechanized disassembly of the bus. Slightly improper operation may cause damage to the battery cell and cause harm. In summary, under the joint action of the visual scanning structure and the robot PCL system, an adaptive bus cutting processing path is generated, thereby avoiding damage to the battery cell by the cutting device, and thus making the cutting device have better protection performance for the battery cell.

[0100] In one embodiment, step S109 of flipping the CTP battery pack after the heating operation is specifically performed by using a rotating device to flip the CTP battery pack after the heating operation. In this embodiment, the rotating device is a rotating machine. The rotating machine fixes the assembly and drives the assembly to rotate 180 degrees, flipping the CTP battery pack 180 degrees, so that the bottom of the CTP battery pack faces upward.

[0101] In one embodiment, step S111 of vibrating the CTP battery pack after the flipping operation is specifically as follows: vibrating the CTP battery pack after the flipping operation is completed using a vibration device. In this embodiment, the vibration device is a high-frequency vibration machine. Since the structural adhesive between the battery cell and the battery pack shell has a certain thickness and has a good heat insulation effect, the high temperature will not be quickly transferred to the surface of the battery cell in a short period of time. At this time, the CTP battery pack is flipped over to apply a downward vibration force to the bottom of the battery pack shell, so that the battery cell can be loosened from the battery pack shell. The viscosity of the residual structural adhesive on the bottom of the battery cell is reduced, and the staff can quickly disassemble the structural adhesive adhered to the surface of the battery cell with their hands and tools, so that the staff has a higher disassembly efficiency when disassembling the CTP battery pack. The high-frequency vibration frequency range of the vibration device is 500Hz to 10000Hz.

[0102] Furthermore, when the high-frequency vibration machine is working, the battery cells automatically loosen from the bottom of the battery pack shell and fall onto the bottom transmission track. The staff wearing heat-insulating gloves tear off the remaining structural adhesive from the surface of the battery cells.

[0103] Compared with the prior art, this application has at least but not limited to the following advantages:

[0104] 1. Due to the heating operation on the bottom of the CTP battery pack, the temperature of the bottom of the CTP battery pack rises, that is, the temperature of the bottom of the battery pack shell rises, so that the structural adhesive at the bottom of the battery pack shell gradually softens under the heat, so that the viscosity of the structural adhesive at the bonding point between each battery cell and the inner wall of the battery pack shell gradually decreases or even fails, thereby reducing the bonding strength between each battery cell and the inner wall of the battery pack shell. Then, the CTP battery pack is turned over and the bottom of the CTP battery pack is vibrated, that is, the bottom of the battery pack shell is vibrated, thereby applying a downward vibration force to the bottom of the battery pack shell, so that the bonding strength between each battery cell and the inner wall of the battery pack shell is improved. When the temperature is reduced, the position of each battery cell in the battery pack shell is loose, so that under the combined action of the gravity of each battery cell and the downward vibration force, each battery cell is easier to fall off from the battery pack shell, thereby accelerating the separation speed between the battery cell and the battery pack shell, making each battery cell easier to separate from the battery pack shell, thereby solving the problem that the staff need to repeatedly pry or hammer the connection between each battery cell and the inner wall of the battery pack shell during the disassembly of the CTP battery pack, and then the heating and vibration work together to replace prying or hammering, so that each battery cell can fall off from the inner wall of the battery pack shell.

[0105] 2. The present application adopts an electromagnetic heating device to perform flameless heating on the bottom of the CTP battery pack. Since the bottom of the battery cell is fixed to the battery pack shell with structural adhesive, when the electromagnetic heating device heats the bottom of the battery pack shell, the temperature of the bottom of the battery pack shell rises rapidly, causing the surface viscosity of the structural adhesive in contact with it to fail, thereby reducing the viscosity of the structural adhesive between the battery cell and the battery pack shell, thereby enabling the battery cell to be better separated from the battery pack shell, so that the staff has a higher disassembly efficiency when disassembling the CTP battery pack.

[0106] 3. The present application adopts a cutting device to automatically cut off the bus connecting two adjacent battery cells in the CTP battery pack along the bus cutting processing path, so that the two adjacent battery cells are disconnected, thereby avoiding the staff from prying or hammering the CTP battery pack, thereby facilitating the staff to disassemble the battery cells, and making the staff more efficient in disassembling the CTP battery pack.

[0107] 4. The discharge device in the present application is electrically connected to the power grid or energy storage device, so that the power of the first whole pack discharge, the power of the second whole pack discharge, the power of the first whole group discharge, the power of the second whole group discharge and the power of the single cell discharge can all be fed back to the power grid or energy storage device through the discharge device, so that the CTP battery pack disassembly method has a high utilization rate for the extraction of residual power.

[0108] 5. The energy storage device in this application is electrically connected to the electromagnetic heating device so that the energy storage device is used to provide the power required by the heating device, so that the residual power of the CTP battery pack is stored in the energy storage device for secondary use, thereby improving energy utilization and reducing energy waste.

[0109] 6. After the CTP battery pack is allowed to stand for the first time after the whole pack is discharged, the discharge device is used to perform a second whole pack discharge on the CTP battery pack after it has been stationary for a period of time, so as to realize the cascade discharge of the CTP battery pack. During the cascade discharge of the CTP battery pack, the temperature of the battery cell does not rise high during the first whole pack discharge, so that the temperature of the battery cell is safe and controllable. The standing operation is conducive to cooling the battery cell, so that the CTP battery pack has been fully cooled during the second whole pack discharge, so that the temperature of the battery cell does not rise high during the second whole pack discharge, so that the temperature of the battery cell is safe and controllable, thereby effectively reducing the probability of risks such as bulging, fire and explosion of the battery cell, so that the staff has better disassembly safety when disassembling the CTP battery pack.

[0110] 7. After the battery pack is allowed to stand for the first time after the entire group discharge, a discharge device is used to discharge the battery pack for the second time after the entire group has been stood for a period of time, so as to realize the cascade discharge of the battery pack. During the cascade discharge of each battery pack, the temperature of the battery cells during the first entire group discharge is not high, so that the temperature of the battery cells is safe and controllable. The standing operation is conducive to cooling the battery cells, so that each battery pack has been fully cooled during the second entire group discharge, so that the temperature of the battery cells during the second entire group discharge is not high, so that the temperature of the battery cells is safe and controllable, thereby effectively reducing the probability of risks such as bulging, fire and explosion of the battery cells, so that the staff has better disassembly safety when disassembling the CTP battery pack.

[0111] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-described embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

Claims

1. A CTP battery pack disassembly method, characterized in that: include: Perform pre-processing operations on the CTP battery pack to remove the top cover, electronic control module and shielding accessories; Performing a discharge operation on the CTP battery pack after completing the pretreatment operation; Automatically disconnecting the busbar connecting two adjacent battery cells in the CTP battery pack; Heating the bottom of the CTP battery pack; Performing a flipping operation on the CTP battery pack after completing the heating operation; performing a vibration operation on the CTP battery pack after the flipping operation is completed, so as to separate each of the battery cells from the CTP battery pack; The step of discharging the CTP battery pack after the pre-processing operation includes: Performing voltage detection on the CTP battery pack; Obtaining voltage detection data for determining whether to discharge the entire CTP battery pack, the entire group, or a single cell; The step of obtaining voltage detection data for determining whether to discharge the entire CTP battery pack, discharge the entire group of batteries, or discharge a single battery pack comprises: Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value; Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V; If yes, use a discharge device to discharge the entire CTP battery pack for the first time, and discharge the entire pack for the first time until the first voltage detection value is less than or equal to the number of battery cells in series in the CTP battery pack multiplied by 3V; Performing a static operation on the CTP battery pack after the first full pack discharge; The discharge device is used to perform a second full-pack discharge on the CTP battery pack after it has been stationary for a period of time, wherein the second full-pack discharge is performed until the first voltage detection value is less than or equal to the number of battery cells in series in the CTP battery pack multiplied by 0.3V; The steps of discharging the entire CTP battery pack for the first time using a discharge device are specifically as follows: The positive electrode and the negative electrode of the CTP battery pack are electrically connected to the discharge connection wires of the discharge device respectively to form a first whole-pack discharge circuit.

2. The CTP battery pack disassembly method according to claim 1, characterized in that: The steps for pre-processing the CTP battery pack include: Fixing the CTP battery pack with a clamp so that the clamp and the CTP battery pack together form a combination; Placing the assembly on a transmission crawler and controlling the transmission crawler to move at a predetermined linear speed; Perform insulation testing on the CTP battery pack.

3. The CTP battery pack disassembly method according to claim 1, characterized in that: The step of obtaining voltage detection data for determining whether to discharge the entire CTP battery pack, discharge the entire group, or discharge a single battery pack includes: Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value; Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V; If not, detecting the voltage between the positive electrode and the negative electrode of each battery group in the CTP battery pack to obtain a second voltage detection value; Determining whether the second voltage detection value of each of the battery packs is greater than the number of battery cells connected in series in the battery pack multiplied by 3V; If yes, use a discharge device to perform a first discharge on the entire battery pack, wherein the first discharge is performed until the second voltage detection value of the battery pack is less than or equal to the number of battery cells in series in the battery pack multiplied by 3V; performing a static operation on the battery pack after the first full discharge; The discharge device is used to perform a second discharge on the battery pack after it has been stationary for a period of time, and the second discharge is performed until the second voltage detection value is less than or equal to the number of battery cells in the battery pack connected in series multiplied by 0.3V.

4. The CTP battery pack disassembly method according to claim 3, characterized in that: The step of obtaining voltage detection data for determining whether to discharge the entire CTP battery pack, discharge the entire group, or discharge a single battery pack includes: Detecting a voltage between a positive electrode and a negative electrode of the CTP battery pack to obtain a first voltage detection value; Determine whether the first voltage detection value is greater than the number of battery cells connected in series in the CTP battery pack multiplied by 3V; If not, detecting the voltage between the positive electrode and the negative electrode of each battery group in the CTP battery pack to obtain a second voltage detection value; Determining whether the second voltage detection value of each of the battery packs is greater than the number of battery cells connected in series in the battery pack multiplied by 3V; If not, detecting the voltage of each battery cell in each of the battery packs to obtain a third voltage detection value; Determining whether the third voltage detection value of each battery cell is greater than 0.3V; If so, a discharge device is used to discharge the battery cell until the third voltage detection value of the battery cell is less than or equal to 0.3V.

5. The CTP battery pack disassembly method according to any one of claims 1 to 4, characterized in that: The discharge device is electrically connected to the grid terminal or the energy storage device.

6. The CTP battery pack disassembly method according to any one of claims 1 to 4, characterized in that: The steps of heating the bottom of the CTP battery pack are specifically as follows: An electromagnetic heating device is used to heat the bottom of the CTP battery pack.

7. The CTP battery pack disassembly method according to claim 6, characterized in that: A heat insulation plate is provided between the electromagnetic heating device and the bottom of the CTP battery pack.

8. The CTP battery pack disassembly method according to claim 6, characterized in that: The electromagnetic heating device includes a first temperature sensor and a second temperature sensor. The first temperature sensor is arranged at the bottom of the battery pack shell of the CTP battery pack, and the second temperature sensor is arranged on the surface of the battery cell.

9. The CTP battery pack disassembly method according to claim 8, characterized in that: There are multiple first temperature sensors and multiple second temperature sensors, and the first temperature sensors and the second temperature sensors are distributed in a matrix.

10. The CTP battery pack disassembly method according to claim 6, characterized in that: The discharging device is electrically connected to the energy storage device; and the energy storage device is electrically connected to the electromagnetic heating device.

11. The CTP battery pack disassembly method according to claim 1, characterized in that: The step of automatically disconnecting the busbar connecting two adjacent battery cells in the CTP battery pack includes: Generate busbar cutting processing path; A cutting device is used to automatically cut off the busbar connecting two adjacent battery cells in the CTP battery pack along the busbar cutting processing path.

12. The CTP battery pack disassembly method according to claim 11, characterized in that: The cutting device is provided with a visual scanning structure, and the visual scanning structure is electrically connected to the control device. The steps of generating a busbar cutting processing path include: Using the visual scanning structure to capture an image of the bus to obtain image data of the bus; The control device is used to perform calculation processing on the image data of the bus bar to generate the bus bar cutting processing path.

13. The CTP battery pack disassembly method according to claim 12, characterized in that: The step of using the control device to perform calculation processing on the image data of the bus to generate the bus cutting processing path includes: Using the control device to perform calculation processing on the image data of the busbar to obtain the welding point position and the welding point height of the busbar; The control device is used to generate the busbar cutting processing path according to the welding point position and the welding point height of the busbar.

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