Baking equipment capable of detecting water content in baking process

Abstract

The utility model provides baking equipment capable of detecting the water content in the baking process, which comprises a vacuum baking box, a water storage tank and a water storage tank, the flexible sealing pipe penetrates through the inside and the outside of the vacuum baking box; the fastening device is used for fixing the flexible sealing pipe and the vacuum baking box; the traction rope penetrates through the flexible sealing pipe, the outer diameter of the traction rope is larger than the inner diameter of the flexible sealing pipe, and when the traction rope is pulled by external force to move in the flexible sealing pipe, the traction rope and the flexible sealing pipe are always kept in a mutual sealing state; the detection bodies are fixed to the portions, located in the vacuum baking box, of the traction rope at intervals, the detection bodies can penetrate through the flexible sealing pipe along with the traction rope to move out of the vacuum baking box under the action of external force, and the water content of the detection bodies corresponds to the water content of the to-be-baked object in the baking process. The water content of objects to be baked in the baking box can be detected in time, and insufficient baking or excessive baking is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a baking device capable of detecting the water content of an object to be baked during the baking process. Background Art

[0002] In the prior art, the water content of an object to be baked usually cannot be observed in time. If it is necessary to detect the water content of the object to be baked, the object to be baked usually needs to be taken out for detection before the specific water content of the object to be baked during the baking process can be known. However, for some objects to be baked, they are baked in a vacuum environment, so the water content cannot be detected at any time during the baking process.

[0003] Taking the baking of a battery as an example, the electrode materials used in lithium batteries are all porous materials, which have strong porous adsorption characteristics and a large surface area. If there is excessive moisture in the pores before the battery is made, it will seriously affect the performance, stability and safety of the finished battery. Therefore, the main purpose of baking and drying the battery is to remove the moisture in the battery electrodes and improve the performance, stability and safety of the battery.

[0004] A common method for baking and drying batteries is to load the un-injected battery into a vacuum baking oven. The baking temperature is usually 100 degrees Celsius to 150 degrees Celsius, and a vacuum pump is used to pump the air pressure in the vacuum baking oven to about 100 Pascals. The baking duration is usually 6 hours to 18 hours.

[0005] To confirm that the baking is qualified, the current detection method is to randomly select a battery after the battery baking is completed and detect the water content of the electrode material. That is to say, in the current battery baking process, the water content detection method is sampling detection after baking. Assuming that the water content detection fails after baking, the baking process needs to be repeated again, but there is no specific and definite standard for when it is appropriate to bake. The reason why the water content cannot be detected during the baking process of the battery is that if the oven is opened for sampling during the baking process, the high-temperature and vacuum environment in the baking oven will be damaged, affecting the baking effect.

[0006] However, the baking time of lithium batteries is crucial. If the time is too short, too much moisture remains; on the contrary, if the time is too long, the inside of the lithium battery will be over-dried, resulting in a shortened battery life.

[0007] Therefore, for the baking of batteries and similar items, how to provide a baking device capable of detecting the water content of the object to be baked during the baking process is a technical problem to be solved. Summary of the Utility Model

[0008] In order to solve the problem that the water content of an object to be baked cannot be viewed in time during vacuum baking in the prior art, the utility model provides a baking device capable of detecting the water content during the baking process.

[0009] The baking equipment capable of detecting the water content during the baking process of the present utility model includes:

[0010] A vacuum baking oven for baking the object to be baked;

[0011] A flexible sealing tube penetrating inside and outside the vacuum baking oven;

[0012] A fastening device for fixing the flexible sealing tube to the vacuum baking oven;

[0013] A towing rope passing through the flexible sealing tube, and the outer diameter of the towing rope is larger than the inner diameter of the flexible sealing tube. When an external force pulls the towing rope to move inside the flexible sealing tube, the towing rope and the flexible sealing tube always maintain a mutually sealed state;

[0014] A detection body, which is fixedly spaced on the part of the towing rope located inside the vacuum baking oven, can move outside the vacuum baking oven through the flexible sealing tube under the action of an external force, and the water content of the detection body has a corresponding relationship with the water content of the object to be baked during the baking process.

[0015] Further, the cross-section of the flexible sealing tube passing through its axis is in a T shape, and the end with a larger outer diameter is located outside the vacuum baking oven. The fastening device includes a mounting ring sleeved on the flexible sealing tube inside the vacuum baking oven, and a flange for pressing one end of the flexible sealing tube located outside the vacuum baking oven against the outer wall of the vacuum baking oven. The flange and the mounting ring are fixedly connected by screws.

[0016] Further, the flexible sealing tube is made of one of fluororubber or silicone rubber.

[0017] Further, the towing rope is made of a metal material and is in the shape of a rod with a consistent outer diameter, and is provided with a plurality of detection grooves for accommodating the detection body.

[0018] Further, the towing rope includes:

[0019] A mounting cavity for accommodating the detection body. The mounting cavity includes two half-cavities with an outer diameter gradually decreasing from the first end to the second end, and the first ends of the two half-cavities can be detachably connected; a plurality of ventilation holes are provided on the half-cavity;

[0020] A rope body part, the outer diameter of each end of each section between the two mounting cavities is larger than the outer diameter of the middle part thereof, and the outer diameter of the end thereof is clamped with the second end of the half-cavity.

[0021] Further, the mounting cavity is in a waist shape or an ellipsoidal shape, or the half-cavity is in a conical shape.

[0022] Further, a plurality of annular grooves are provided on the inner cavity wall of the flexible sealing tube at intervals.

[0023] Further, a traction ring is provided at one end of the traction rope outside the baking oven.

[0024] Further, the object to be baked is a battery.

[0025] Further, the detection body is an electrode or made of lithium cobalt oxide.

[0026] In the utility model, a flexible sealing tube and a traction rope located in the flexible sealing tube are arranged on the vacuum baking oven, and then a corresponding detection body is fixed on the traction rope, so that the traction rope can be pulled out at intervals to detect the water content of the detection body, thereby obtaining the water content of the object to be baked in the vacuum baking oven, and avoiding insufficient baking or over-baking of the object to be baked in the vacuum baking oven. Description of the Drawings

[0027] The following combines the embodiments and the drawings to describe the utility model in detail, where:

[0028] Figure 1 is a schematic structural diagram of an embodiment of the utility model.

[0029] Figure 2 is a schematic structural diagram of another embodiment of the utility model.

[0030] Figure 3 is a schematic structural diagram of the traction rope of an embodiment of the utility model.

[0031] Figure 4 is a corresponding relationship table of the water content of the battery and the electrode during the baking process of the utility model. Description of the Drawings:

[0033] 1. Vacuum baking oven; 2. Flexible sealing tube; 3. Traction rope; 4. Detection body; 5. Flange; 6. Installation ring; 7. Traction ring; 31. Vent hole; 32. Half cavity; 33. Rope body part. Detailed Embodiments

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the following further describes the utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0035] Accordingly, a feature pointed out in this specification is used to illustrate one feature of an embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the illustrated feature. In addition, it should be noted that this specification describes many features. Although certain features may be combined to show possible system designs, these features can also be used in other combinations not explicitly described. Accordingly, unless otherwise stated, the illustrated combinations are not intended to be limiting.

[0036] In view of the problem in the prior art that during vacuum baking, the water content of the object to be baked cannot be accurately known, a set of technical solutions of the present utility model is proposed.

[0037] The baking device capable of detecting the water content during the baking process of the present utility model includes: a vacuum baking oven 1, a flexible sealing tube 2, a fastening device, a towing rope 3, and a detection body 4.

[0038] The vacuum baking oven 1 of the present utility model has the same structure as the existing vacuum baking oven 1, and their functions are both used to bake the object to be baked. The difference is that the flexible sealing tube 2 of the present utility model penetrates inside and outside the vacuum baking oven 1. When there is no filling inside the flexible sealing tube 2, the inside and outside of the vacuum baking oven 1 can be connected.

[0039] The towing rope 3 is filled inside the flexible sealing tube 2. The towing rope 3 penetrates the flexible sealing tube 2, with a part located outside the vacuum baking oven 1 and a part located inside the vacuum baking oven 1. The outer diameter of the towing rope 3 is larger than the inner diameter of the flexible sealing tube. When an external force pulls the towing rope 3, the towing rope 3 can move outside the vacuum baking oven 1 inside the flexible sealing tube 2, and during the movement, the towing rope 3 and the flexible sealing tube 2 always maintain a mutually sealed state.

[0040] Since there is a pressure difference between the inside and outside of the vacuum baking oven 1, and the towing rope 3 inside the flexible sealing tube 2 needs to be dragged back and forth, the fixation of the flexible sealing tube 2 is also relatively important. The present utility model can fix the flexible sealing tube 2 on the vacuum baking oven 1 through the fastening device to avoid the pressure difference or the dragging operation from affecting its sealing performance with the vacuum baking oven 1.

[0041] The test body 4 is fixedly spaced on the towing rope 3 and is fixed to the part of the towing rope 3 located inside the vacuum baking oven 1. Under the action of an external force, the test body 4 can pass through the flexible sealing tube along with the towing rope 3 and move outside the vacuum baking oven 1. At the same time, the test body 4 is not an arbitrary test body 4. The water content of the test body 4 selected by the present utility model has a corresponding relationship with the water content of the object to be baked during the baking process. Therefore, at least one test body 4 can be pulled out by dragging the towing rope 3 during the baking process to detect the water content of the test body 4. According to the corresponding relationship between the water content of the test body 4 and the water content of the object to be baked, the current water content of the object to be baked can be known, so that the baking process of the object to be baked can be stopped in time to make its current water content meet the actual needs of the product.

[0042] In a specific embodiment, the cross-section of the flexible sealing tube 2 of the present utility model passing through its axis is in a T shape, as Figure 1 or Figure 2 shown, and the end with a larger outer diameter of the flexible sealing tube 2 is located outside the vacuum baking oven 1, plugging the opening of the vacuum baking oven 1 like a hollow plug. The fastening device includes two parts. One part is the mounting ring 6 sleeved on the flexible sealing tube 2 inside the vacuum baking oven 1, and the other part is the flange 5 that presses the end of the flexible sealing tube 2 located outside the vacuum baking oven 1 against the outer wall of the vacuum baking oven 1. Then, the flange 5 and the mounting ring 6 can be fixedly connected by screws. This structure is very firm and effective, which can not only prevent the flexible sealing tube 2 from loosening due to the internal and external pressure difference, but also prevent the flexible sealing tube 2 from loosening when pulling the towing rope 3.

[0043] In a specific embodiment, the flexible sealing tube 2 of the present utility model is made of one of the materials of high-temperature-resistant fluororubber or silicone rubber. Those skilled in the art can also use other high-temperature-resistant and elastic materials to make the flexible sealing tube 2.

[0044] Figure 1 Shows a specific embodiment of the present utility model.

[0045] In this embodiment, the towing rope 3 is made of a metal material. In fact, the towing rope 3 is a rod-shaped body with a uniform outer diameter in appearance, that is, it is rod-shaped. A plurality of test slots for accommodating the test body 4 are provided on the towing rope 3. After the test body 4 is placed in the test slot, it does not protrude from the surface of the towing rope 3 to prevent the frictional force generated when passing through the flexible sealing tube 2 from moving the test body 4 out of the test slot.

[0046] One end of the towing rope 3 located outside the vacuum baking oven 1 is provided with a towing ring 7 for facilitating the pulling of the towing rope 3. In this embodiment, the cross-section of the flexible sealing tube 2 is in a T shape and is fixed to the vacuum baking oven 1 by the flange 5 and the mounting ring 6.

[0047] Figure 2Another embodiment of the present utility model is shown. In this embodiment, the towing rope 3 is flexible, and the towing rope 3 includes an installation cavity and a rope body portion 33.

[0048] One installation cavity is used to accommodate a detection body 4. The installation cavity includes two half-cavities 32 whose outer diameters gradually decrease from the first end to the second end. The first ends of the two half-cavities 32 can be detachably connected to each other. When the first ends of the two half-cavities 32 are connected to each other, the installation cavity is formed. A plurality of ventilation holes 31 are provided on each half-cavity 32 to facilitate the evaporation of the moisture during baking.

[0049] The rope body portion 33 is divided into multiple segments. The outer diameter of the end of a segment of the rope body portion 33 located between two installation cavities is greater than the outer diameter of the middle of this rope body portion 33, and the outer diameter of the end of this segment of the rope body portion 33 is snap-fitted with the second end of the half-cavity 32. Figure 3 A specific structure of the installation cavity and the rope body portion 33 is shown.

[0050] The installation cavity of the present utility model can be in a waist shape or an ellipsoidal shape, or the half-cavity 32 is in a conical shape, or it can be other shapes that can both install the detection body 4 and facilitate passing through the flexible sealing tube 2, all of which belong to the protection scope of the present utility model.

[0051] In this embodiment, a plurality of annular grooves are provided at intervals on the inner cavity wall of the flexible sealing tube 2, which can reduce the resistance of pulling out the towing rope 3 while ensuring the sealing performance.

[0052] In a specific application embodiment, the object to be baked of the present utility model is a battery, but it is not limited to a battery and can be other items that need to be baked in the vacuum baking oven 1.

[0053] When the object to be baked is a battery, the detection body 4 can be selected as an electrode as the detection body 4, or it can also be other detection bodies 4 made of lithium cobalt oxide. When the object to be baked is other items, the detection body 4 and the object to be baked can also be the same substance with different sizes.

[0054] Such as Figure 4 As shown, there is a corresponding relationship between the water content of the positive and negative electrodes of the battery and the water content of the battery during the baking process. Assume that during the baking of the battery, the qualified threshold of the water content of the baked battery is Th, and there is a correlation y = f(x) between the water content of the detection body 4 and the water content of the battery electrode, where y is the water content of the battery electrode and x is the water content of the detection body 4. The correlation y = f(x) is related to the material, volume of the detection body 4, and the variety of the battery, and a large amount of relevant data needs to be obtained in advance through experiments and fitted.

[0055] During the battery baking process, under the action of high temperature and vacuum, the moisture content in the battery and the material of the detector 4 gradually decreases. Pull the traction rope 3 at intervals to pull one or more detectors 4 out of the cavity. During the pulling process of the detector 4, the flexible sealing tube 2 always maintains a seal with the traction rope 3 based on its own elasticity. After pulling out the latest detector 4, detect the moisture content of the pulled-out detector 4 to obtain the moisture content x of the detector 4, and then obtain the moisture content y of the battery electrode in the box from y = f(x). If y > Th, continue baking; if y < Th, the baking ends.

[0056] Through the above technical solutions of the present utility model, it is possible to detect the moisture content of the battery electrode at intervals during the baking process. When the moisture content of the battery electrode is lower than the threshold value, the baking can be stopped in time to avoid the problem of over-drying of the battery caused by over-baking. After the battery baking meets the standard, the baking can be stopped in time, which can also avoid the waste of energy and time, improve the battery production rhythm, and increase the production capacity.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A baking device capable of detecting the moisture content during baking, characterized in that: include: A vacuum baking oven, used for baking the items to be baked; A flexible sealing tube, passing through the inside and outside of the vacuum baking oven; A fastening device for fixing the flexible sealing tube to the vacuum baking oven; A traction rope, which passes through the flexible sealing tube and has an outer diameter greater than an inner diameter of the flexible sealing tube. When an external force pulls the traction rope to move in the flexible sealing tube, the traction rope and the flexible sealing tube always maintain a mutually sealed state; The detection body is fixed at intervals at the part of the traction rope located in the vacuum baking oven. Under the action of external force, it can move to the outside of the vacuum baking oven along with the traction rope through the flexible sealing tube, and the moisture content of the detection body corresponds to the moisture content of the object to be baked during the baking process.

2. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: The cross-section of the flexible sealing tube passing through its axis is T-shaped, and the end with a larger outer diameter is located outside the vacuum baking oven. The fastening device includes a mounting ring sleeved on the flexible sealing tube in the vacuum baking oven, and a flange that presses the end of the flexible sealing tube located outside the vacuum baking oven against the outer wall of the vacuum baking oven, and the flange is fixedly connected to the mounting ring by screws.

3. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: The flexible sealing tube is made of one of fluororubber and silicone rubber.

4. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: The traction rope is made of metal material and is in the shape of a rod with a uniform outer diameter, and is provided with a plurality of detection grooves for accommodating the detection body.

5. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: The traction rope comprises: An installation cavity, which is used to accommodate the detection object, the installation cavity includes two half cavities with outer diameters gradually decreasing from the first end to the second end, and the first ends of the two half cavities are detachably connected to each other; a plurality of air holes are provided on the half cavity; The outer diameter of the end of each section of the rope body located between the two installation cavities is larger than the outer diameter of the middle part, and the outer diameter of the end is mutually clamped with the second end of the half cavity.

6. The baking device capable of detecting the moisture content during baking as claimed in claim 5, characterized in that: The installation cavity is waist-shaped or ellipsoidal, or the half cavity is conical.

7. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: The inner cavity wall of the flexible sealing tube is provided with a plurality of annular grooves arranged at intervals.

8. The baking device capable of detecting the moisture content during baking as claimed in claim 1, characterized in that: A traction ring is provided at one end of the traction rope located outside the baking oven.

9. The baking device capable of detecting the moisture content during baking according to any one of claims 1 to 8, characterized in that: The object to be baked is a battery.

10. The baking device capable of detecting the moisture content during baking as claimed in claim 9, characterized in that: The detection body is an electrode or is made of lithium cobalt oxide.

Images