A battery pack glue removal process and equipment

Abstract

The present application relates to a battery pack degumming process and equipment, and the degumming process includes the following steps: S1, condensing the NMP high-temperature waste gas discharged from the electrode coating oven into NMP waste liquid through a condenser, and transporting the NMP waste liquid to the soaking area of ​​the degumming box; S2, exchanging heat between the NMP high-temperature waste gas and the NMP waste liquid in the soaking area to heat the NMP waste liquid to a preset temperature; S3, soaking the battery pack in the NMP waste liquid in the soaking area; S4, after the soaking reaches the preset soaking time, transferring the battery pack from the soaking area to the drying area; S5, passing the NMP high-temperature waste gas into the drying area of ​​the degumming box to dry the battery pack. The battery pack degumming process and equipment of the present application can conveniently and effectively remove the sealant on the battery cell, which utilizes the NMP high-temperature waste gas discharged from the electrode coating oven, consumes less energy, and is conducive to energy saving.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack glue removal process and equipment. Background Art

[0002] A finished battery pack generally contains multiple cells, which are glued together with sealant on the outside. When a cell in the battery pack is damaged, it may affect the power and voltage of the entire battery pack, or even cause an explosion. Therefore, the battery pack needs to be replaced. Some cells in the battery pack are bad and some are good. If the battery pack is disassembled directly, it will cause a waste of resources. If the battery pack can be disassembled into individual cells, the problematic cells can be removed and reassembled into a new battery pack, the waste of resources can be greatly reduced. However, there is no convenient and energy-saving glue removal process and equipment for removing the sealant of the battery cells. Summary of the invention

[0003] Based on this, the present application provides a battery pack degumming process and equipment, which can easily remove the sealant of the battery cell, and can achieve energy saving effect by utilizing the NMP high-temperature exhaust gas discharged from the electrode coating oven for degumming.

[0004] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0005] A battery pack glue removal process includes the following steps:

[0006] S1. The NMP high-temperature waste gas discharged from the electrode coating oven is condensed into NMP waste liquid through a condenser, and the NMP waste liquid is transported to the soaking area of ​​the degumming box;

[0007] S2, exchanging heat between the NMP high temperature waste gas and the NMP waste liquid in the soaking zone to heat the NMP waste liquid to a preset temperature;

[0008] S3, immersing the battery pack in the NMP waste liquid in the immersion area;

[0009] S4, after the immersion reaches the preset immersion time, the battery pack is transferred from the immersion area to the drying area;

[0010] S5. Pass the NMP high-temperature exhaust gas into the drying area of ​​the degumming box to dry the battery pack.

[0011] Furthermore, the preset temperature is 45-60° C., and the preset soaking time is 45-50 hours.

[0012] In one of the embodiments, in step S3, while soaking, the NMP waste liquid is vibrated by a vibrator to accelerate the removal of the glue from the battery cells of the battery pack.

[0013] In one of the embodiments, step S6 is further included: transporting the NMP high-temperature waste gas for heat exchange with the NMP waste liquid in the soaking zone and the NMP high-temperature waste gas for drying the battery pack to the absorption tower for waste gas treatment.

[0014] A battery pack degumming device comprises a coating oven exhaust duct, a condenser, a degumming box and a spray pipe, wherein the air inlet end of the coating oven exhaust duct is connected to the exhaust port of the coating oven, and the air outlet end is connected to the air inlet of the condenser, a soaking area and a drying area are arranged inside the degumming box, the drying area is located above the soaking area and is connected to the soaking area, the soaking area is connected to the liquid receiving tank of the condenser, and the drying area is connected to the air outlet of the condenser, and the spray pipe is used to spray the NMP waste liquid in the soaking area into the drying area so that the NMP waste liquid exchanges heat with the NMP high-temperature exhaust gas to heat the NMP waste liquid.

[0015] In one of the embodiments, a temperature control device is further included, which includes a temperature sensor, a temperature controller and an electrically controlled spray pump. The temperature sensor is used to detect the temperature of the NMP waste liquid in the soaking area. The electrically controlled spray pump is arranged on the spray pipe. The temperature controller is communicatively connected to the temperature sensor and the electrically controlled spray pump.

[0016] In one of the embodiments, a vibrator is provided on the box of the soaking zone.

[0017] In one of the embodiments, an opening is provided on the box body at the top of the drying area, and a seal cover that can be opened and closed is installed on the opening; the battery pack degumming equipment also includes a hanging basket and a lifting mechanism, the hanging basket is used to place the battery pack, the hanging basket can pass through the opening, and the lifting mechanism is used to drive the hanging basket to perform lifting and lowering movements.

[0018] In one of the embodiments, it further includes a waste gas conveying pipeline and an absorption tower, and the waste gas conveying pipeline is used to connect the drying area and the absorption tower.

[0019] In one of the embodiments, it further includes a fresh air delivery pipeline, which is connected to the drying area to deliver fresh air into the drying area.

[0020] The battery pack degumming process and system of the present application, by immersing the battery pack in NMP waste liquid, the sealant on the battery cell is similarly soluble in the NMP waste liquid, so that the sealant loses surface tension and detaches from the battery cell, which can conveniently and effectively remove the glue. The NMP waste liquid comes from the NMP high-temperature exhaust gas discharged from the pole piece coating oven, the heat source for heating the NMP waste liquid is also the NMP high-temperature exhaust gas, and the NMP high-temperature exhaust gas is also used to dry the battery pack, so the heat of NMP and exhaust gas is recovered, which has an energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 Flow chart of the battery pack glue removal process according to an embodiment of the present application.

[0023] Figure 2 This is a schematic diagram of the structure of a battery pack glue removal device according to an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 10. Exhaust duct of coating oven; 11. Air supply fan; 20. Condenser; 30. Glue removal box; 31. Soaking area; 311. Vibrator; 32. Drying area; 33. Opening; 34. Sealing cover; 40. Spray pipe; 42. Spray pump; 50. Waste gas conveying pipeline; 61. Hanging basket; 62. Lifting mechanism; 70. Absorption tower; 80. Fresh air conveying pipeline; 81. Air supply fan; 90. Waste liquid tank. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] refer to Figure 1 The present application provides a battery pack glue removal process, comprising the following steps:

[0032] S1. The NMP high-temperature waste gas discharged from the electrode coating oven is condensed into NMP waste liquid through a condenser, and the NMP waste liquid is transported to the soaking area of ​​the degumming box;

[0033] S2, exchanging heat between the NMP high temperature waste gas and the NMP waste liquid in the soaking zone to heat the NMP waste liquid to a preset temperature;

[0034] S3, immersing the battery pack in the NMP waste liquid in the immersion area;

[0035] S4, after the immersion reaches the preset immersion time, the battery pack is transferred from the immersion area to the drying area;

[0036] S5. Pass the NMP high-temperature exhaust gas into the drying area of ​​the degumming box to dry the battery pack.

[0037] It should be noted that before removing the glue, the battery pack is discharged and the circuit board, casing and other parts of the battery pack are removed.

[0038] The battery pack degumming process of the present application is to soak the battery pack in NMP waste liquid, so that the sealant on the battery cell is similarly soluble in the NMP waste liquid, so that the sealant loses surface tension and detaches from the battery cell, which can conveniently and effectively remove the glue. The NMP waste liquid comes from the NMP high-temperature exhaust gas discharged from the pole piece coating oven, and the heat source for heating the NMP waste liquid is also the NMP high-temperature exhaust gas, and the NMP high-temperature exhaust gas is also used to dry the battery pack, so the heat of NMP and exhaust gas is recovered, which has an energy-saving effect.

[0039] Preferably, in step S2, the NMP waste liquid is heated to a preset temperature, the preset temperature is 45-60°C, and in step S3, the preset soaking time of the battery pack in the NMP waste liquid is 45-50 hours. After performing degumming experiments with NMP waste liquids at different temperatures, it is found that the degumming effect of NMP waste liquids with a temperature range of 45-60°C is better. In order to remove the glue as thoroughly as possible, it is better to select a soaking time of 45-50 hours.

[0040] Furthermore, the preset temperature is selected to be 50° C. and the preset soaking time is selected to be 48 hours.

[0041] As an implementable embodiment, in step S3, while soaking, the NMP waste liquid is vibrated by a vibrator to accelerate the removal of the glue from the battery cells of the battery pack.

[0042] As an implementable method, the battery pack degumming process of the present application further includes step S6: transporting the NMP high-temperature waste gas that exchanges heat with the NMP waste liquid in the immersion zone and the NMP high-temperature waste gas that dries the battery pack to an absorption tower for waste gas treatment. The NMP in the NMP high-temperature waste gas is recovered by the absorption tower to reduce the waste gas concentration and avoid direct discharge of the NMP waste gas to pollute the environment.

[0043] Based on the same inventive concept, the present application provides a battery pack glue removal device. Figure 2 The battery pack degumming equipment includes a coating oven exhaust duct 10, a condenser 20, a degumming box 30 and a spray pipe 40. The air inlet end of the coating oven exhaust duct 10 is connected to the exhaust port of the coating oven, and the air outlet end is connected to the air inlet of the condenser 20. A soaking area 31 and a drying area 32 are arranged inside the degumming box 30. The drying area 32 is located above the soaking area 31 and connected to the soaking area 31. The soaking area 31 is connected to the liquid receiving tank of the condenser 20, and the drying area 32 is connected to the air outlet of the condenser 20. The spray pipe 40 is used to spray the NMP waste liquid in the soaking area 31 to the drying area 32 so that the NMP waste liquid and the NMP high-temperature exhaust gas can exchange heat to heat the NMP waste liquid.

[0044] It can be seen that in order to control the transportation of gas and liquid, an air supply fan 11 is set on the exhaust duct 10 of the coating oven, a water inlet pump is set on the connecting water pipe between the immersion area 31 and the liquid receiving tank of the condenser 20, and a spray pump 42 is set on the spray pipe 40.

[0045] The working process of the battery pack degumming equipment of the present application is implemented according to the steps of the aforementioned battery pack degumming process, which is as follows:

[0046] Corresponding to step S1, the air supply fan 11 on the exhaust duct 10 of the coating oven is turned on, and the air supply fan 11 conveys the NMP high-temperature waste gas discharged from the electrode coating oven to the condenser 20. The NMP high-temperature waste gas exchanges heat with the chilled water and condenses into liquid, which then flows into the liquid receiving tank. When the waste liquid in the liquid receiving tank reaches a certain height, the water inlet pump is turned on, and the water inlet pump conveys the condensed NMP waste liquid to the soaking area 31 of the degumming box 30. When the soaking area 31 is full, the water inlet pump is turned off.

[0047] Corresponding to step S2, the air supply fan 11 on the exhaust duct 10 of the coating oven and the air inlet and outlet of the drying zone 32 are turned on, the chilled water inlet of the condenser 20 is closed, and the spray pump 42 is turned on. The NMP high-temperature exhaust gas is transported to the drying zone 32, and the NMP waste liquid in the immersion zone 31 is sprayed in the NMP high-temperature exhaust gas. The NMP high-temperature exhaust gas and the NMP waste liquid exchange heat to heat the NMP waste liquid. After the NMP waste liquid is heated to a preset temperature, the air supply fan 11 on the exhaust duct 10 of the coating oven, the air inlet and outlet of the drying zone 32 and the spray pump 42 are turned off.

[0048] Corresponding to step S3, the door of the degumming box 30 is opened, the battery pack is immersed in the NMP waste liquid in the immersion area 31, and then the door of the degumming box 30 is closed for a preset immersion time.

[0049] Corresponding to step S4 , the battery pack from which the glue has been removed is transferred from the soaking area 31 to the drying area 32 .

[0050] Corresponding to step S5, the air supply fan 11 on the exhaust duct 10 of the coating oven and the air inlet and outlet of the drying area 32 are opened, and the NMP high-temperature exhaust gas is transported to the drying area 32, and the NMP high-temperature exhaust gas dries the battery pack. After the battery pack is dried, the air supply fan 11 on the exhaust duct 10 of the coating oven and the air inlet and outlet of the drying area 32 are closed, the door of the degumming box 30 is opened, and the battery pack is taken out of the degumming box 30.

[0051] Furthermore, the battery pack degumming equipment of the present application also includes a temperature control device, which includes a temperature sensor, a temperature controller and an electrically controlled spray pump 42. The temperature sensor is used to detect the temperature of the NMP waste liquid in the immersion area 31. The electrically controlled spray pump 42 is arranged on the spray pipe 40. The temperature controller communicates with the temperature sensor and the electrically controlled spray pump 42.

[0052] The temperature sensor detects the temperature of the NMP waste liquid in the soaking area 31 in real time, and the temperature controller compares the value detected by the temperature sensor with the preset temperature. When the value detected by the temperature sensor is lower than the preset temperature, the electronically controlled spray pump 42 is controlled to start; when the value detected by the temperature sensor reaches the preset temperature, the electronically controlled spray pump 42 is controlled to stop working, thereby realizing the control of the temperature of the NMP waste liquid in the soaking area 31 and keeping the temperature of the NMP waste liquid at the preset temperature.

[0053] As an implementation method, a vibrator 311 is provided on the box of the soaking area 31. During soaking, the vibrator 311 drives the NMP waste liquid in the soaking area 31 to vibrate, which can accelerate the fall of the glue from the battery cell of the battery pack.

[0054] As an implementable embodiment, an opening 33 is provided on the box at the top of the drying area 32, and a seal cover 34 that can be opened and closed is installed on the opening 33. The battery pack degumming equipment also includes a hanging basket 61 and a lifting mechanism 62. The hanging basket 61 is used to place the battery pack, and the hanging basket 61 can pass through the opening 33. The lifting mechanism 62 is used to drive the hanging basket 61 to perform lifting and lowering movements. In this way, it can be achieved: put the battery pack into the hanging basket 61, open the seal cover 34, and the lifting device drives the hanging basket 61 to descend and enter the degumming box 30 from the opening 33 until the hanging basket 61 finally sinks into the soaking area 31. After the soaking is completed, the lifting device drives the hanging basket 61 to rise to the drying area 32. After the drying is completed, the lifting device continues to lift the hanging basket 61, and the hanging basket 61 leaves the degumming box 30 from the opening 33. This facilitates the transfer of the battery pack.

[0055] As an implementable embodiment, the battery pack degumming equipment of the present application also includes a waste gas conveying pipeline 50 and an absorption tower 70. The waste gas conveying pipeline 50 is used to connect the drying area 32 with the absorption tower 70, so that the NMP waste gas is conveyed to the absorption tower 70 for treatment and then discharged, which can reduce pollution to the environment.

[0056] As an implementable embodiment, the battery pack degumming device of the present application further includes a fresh air delivery pipeline 80, which is connected to the drying area 32 to deliver fresh air into the drying area 32. In this way, after the drying is stopped, the air supply fan 81 of the fresh air delivery pipeline 80 is turned on to allow the fresh air to pass through the drying area 32, and take the NMP waste gas in the drying area 32 to the absorption tower 70.

[0057] As an implementable embodiment, the battery pack degumming device of the present application further includes a waste liquid tank 90, and the waste liquid tank 90 is connected to the immersion area 31. Since the sealant on the battery pack is left in the NMP waste liquid after falling off, it needs to be cleaned after long-term accumulation. After the NMP waste liquid is discharged to the waste liquid tank 90, the immersion area 31 is cleaned.

[0058] The battery pack degumming process and equipment of the present application can conveniently and effectively remove the sealant of the battery cell, while utilizing the NMP high-temperature exhaust gas discharged from the electrode coating oven, with low energy consumption.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. 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.

[0060] The above-described embodiments only express several implementation methods of the present application and should not be construed as limiting the scope of the patent application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be subject to the attached claims.

Claims

1. A battery pack glue removal process, characterized in that: This process is realized by using battery pack degumming equipment. The battery pack degumming equipment includes a coating oven exhaust duct, a condenser, a degumming box and a spray pipe, the air inlet end of the coating oven exhaust duct is connected to the exhaust port of the coating oven, and the air outlet end is connected to the air inlet of the condenser, and the degumming box is provided with a soaking area and a drying area inside, the drying area is located above the soaking area and connected to the soaking area, the soaking area is connected to the liquid receiving tank of the condenser, and the drying area is connected to the air outlet of the condenser, and the spray pipe is used to spray the NMP waste liquid in the soaking area to the drying area so that the NMP waste liquid and the NMP high-temperature exhaust gas are heat-exchanged to heat the NMP waste liquid; The battery pack degumming equipment also includes a temperature control device, which includes a temperature sensor, a temperature controller and an electrically controlled spray pump, wherein the temperature sensor is used to detect the temperature of the NMP waste liquid in the soaking area, the electrically controlled spray pump is arranged on the spray pipe, and the temperature controller is communicatively connected to the temperature sensor and the electrically controlled spray pump; The battery pack debonding process comprises the following steps: S1. The NMP high-temperature waste gas discharged from the electrode coating oven is condensed into NMP waste liquid through a condenser, and the NMP waste liquid is transported to the soaking area of ​​the degumming box; S2, exchanging heat between the NMP high temperature waste gas and the NMP waste liquid in the soaking zone to heat the NMP waste liquid to a preset temperature; S3, immersing the battery pack in the NMP waste liquid in the immersion area, controlling the temperature of the NMP waste liquid in the immersion area by a temperature sensor, a temperature controller and a spray pump, wherein the temperature sensor detects the temperature of the NMP waste liquid in the immersion area in real time, and the temperature controller compares the value detected by the temperature sensor with a preset temperature, and when the value detected by the temperature sensor is lower than the preset temperature, controls the spray pump to start, and when the value detected by the temperature sensor reaches the preset temperature, controls the spray pump to stop working; S4, after the immersion reaches the preset immersion time, the battery pack is transferred from the immersion area to the drying area; S5. Pass the NMP high-temperature exhaust gas into the drying area of ​​the degumming box to dry the battery pack.

2. The battery pack glue removal process according to claim 1, characterized in that: The preset temperature is 45-60° C., and the preset soaking time is 45-50 hours.

3. The battery pack glue removal process according to claim 1, characterized in that: In step S3, while soaking, the NMP waste liquid is vibrated by a vibrator to accelerate the removal of the glue from the battery cells of the battery pack.

4. The battery pack glue removal process according to claim 1, characterized in that: The method further includes step S6: conveying the NMP high-temperature waste gas for heat exchange with the NMP waste liquid in the soaking zone and the NMP high-temperature waste gas for drying the battery pack to the absorption tower for waste gas treatment.

5. The battery pack glue removal process according to claim 1, characterized in that: A vibrator is provided on the box body of the soaking area.

6. The battery pack glue removal process according to claim 1, characterized in that: An opening is provided on the box body at the top of the drying area, and a seal cover that can be opened and closed is installed on the opening; the battery pack degumming equipment also includes a hanging basket and a lifting mechanism, the hanging basket is used to place the battery pack, the hanging basket can pass through the opening, and the lifting mechanism is used to drive the hanging basket to perform lifting and lowering movements.

7. The battery pack glue removal process according to any one of claims 1 to 6, characterized in that: The battery pack degumming equipment also includes an exhaust gas conveying pipeline and an absorption tower, and the exhaust gas conveying pipeline is used to connect the drying area and the absorption tower.

8. The battery pack glue removal process according to claim 7, characterized in that: The battery pack glue removal equipment also includes a fresh air delivery pipeline, which is connected to the drying area to deliver fresh air into the drying area.

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