A cylindrical battery baking tray

Abstract

This utility model discloses a cylindrical battery baking tray, comprising a tray body and multiple clamps. The tray body has multiple receiving slots, each slot penetrating the tray body. The clamps are respectively disposed within the receiving slots, and each clamp includes two opposing semi-circular heat-conducting plates. An arc-shaped support plate is connected to the bottom of each semi-circular heat-conducting plate, and the semi-circular heat-conducting plates are movably connected to the tray body. The clamps have a clamping state and a releasing state. In the clamping state, the two semi-circular heat-conducting plates are close to and clamp the cylindrical battery; in the releasing state, the two semi-circular heat-conducting plates are away from and release the cylindrical battery. This utility model can quickly conduct heat to the cylindrical surface of the battery, accelerating the heating rate of the cylindrical battery, ensuring temperature consistency between the bottom and top of the battery during baking, thereby improving baking efficiency and ensuring consistent moisture content across different parts of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a cylindrical battery baking tray. Background Technology

[0002] In lithium-ion battery manufacturing, moisture control is mostly achieved through a baking process. The lithium battery cells are placed on a baking tray and then placed inside an oven. Heat is conducted to the cells via a heating plate at the bottom of the oven, and the resulting temperature removes moisture from the positive and negative electrode plates inside the cells. However, for cylindrical batteries, due to their tight winding and high group margin, baking is one of the bottlenecks in their manufacturing process.

[0003] In contact baking methods, such as Figure 1 As shown, the traditional baking trays used for cylindrical batteries typically have a receiving groove radius that is about 1 mm larger than the cylindrical battery radius in order to accommodate the cylindrical batteries. During the baking process, only the positive terminal of the cylindrical battery is in contact with the heating plate. The cylindrical battery heats up slowly and unevenly throughout the process, which ultimately leads to a longer time required to bake the battery to meet the required moisture content. The baking time for NCM4695 cylindrical batteries is as long as 16 hours, which seriously affects production efficiency. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a cylindrical battery baking tray that can quickly conduct heat to the cylindrical surface of the battery, accelerate the heating rate of the cylindrical battery, ensure the consistency of temperature between the bottom and top of the battery during the baking process, thereby improving baking efficiency and ensuring the consistency of moisture in all parts of the battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a cylindrical battery baking tray, which includes a tray body and multiple clamps; multiple receiving slots are formed on the tray body and each receiving slot penetrates the tray body; multiple clamps are respectively disposed in multiple receiving slots, and each clamp includes two oppositely arranged semi-circular heat-conducting plates, the bottom of which is connected to an arc-shaped support plate, and the semi-circular heat-conducting plates are movably connected to the tray body; the clamps have a clamping state and a releasing state. In the clamping state, the two semi-circular heat-conducting plates approach and clamp the cylindrical battery, and in the releasing state, the two semi-circular heat-conducting plates move away from and release the cylindrical battery.

[0007] The cylindrical battery baking tray provided by this utility model has clamps for holding cylindrical batteries in a receiving groove. After the cylindrical battery is placed in the receiving groove, the bottom of the cylindrical battery is supported by two arc-shaped plates. By rotating the two semi-circular heat-conducting clamps, the cylindrical battery can be clamped, increasing the contact area with the cylindrical battery. The arc-shaped plates of the clamps can directly contact the heating plate in the oven, which can quickly conduct heat to the cylindrical surface of the battery, accelerate the heating rate of the cylindrical battery, ensure the consistency of temperature between the bottom and top of the battery during the baking process, thereby improving the baking efficiency and ensuring the consistency of moisture in all parts of the battery.

[0008] As a further improvement to the above-mentioned solution of this utility model, the two semi-circular heat-conducting clamps of the clamp are rotatably connected to the tray body by hinges on opposite sides, and the midpoint of the line connecting the two hinges is located on the central axis of the receiving groove. This ensures that the inner surfaces of the two semi-circular heat-conducting clamps can fit against the cylindrical surface of the cylindrical battery.

[0009] As a further improvement of the above-mentioned solution of this utility model, the upper surface of the tray body is slidably connected with multiple parallel slide rods, and the multiple slide rods are arranged in an alternating manner. One end of the slide rod is connected to the tray body through an elastic element, and the other end extends outward from the tray body. Multiple spaced receiving grooves are provided between any two adjacent slide rods. The clamp also includes two connecting rods, which are rotatably connected to two semi-circular heat-conducting clamps and rotatably connected to two adjacent slide rods.

[0010] Through the structural design of the slide bar, when the tray is waiting to be loaded, all elastic components are in a free state and all clamps are in a released state. The cylindrical battery is picked up by the robot and placed into the receiving slot, with the bottom of the cylindrical battery supported by two arc-shaped plates. At this time, the tray body can be directly pushed into the oven. The end of the slide bar away from the elastic component contacts the inner wall of the oven and moves inward under pressure, squeezing the elastic component. This causes the two semi-circular heat-conducting clamps of each clamp to rotate, move closer together, and close to clamp the cylindrical battery. When the tray body is removed from the oven, the slide bar, under the elastic force of the elastic component, causes the clamps to open, and the robot can then pick up and remove the cylindrical battery.

[0011] As a further improvement of the above-mentioned solution of this utility model, the upper surface of the pallet body is provided with a plurality of staggered sliding grooves. One end of the sliding groove is closed and the other end penetrates through the side of the pallet body. A plurality of sliding rods are slidably connected to the plurality of sliding grooves respectively. The closed end of the sliding groove is connected to an elastic element and the elastic element is connected to the corresponding sliding rod.

[0012] As a further improvement to the above-mentioned solution of this utility model, a vertically arranged rotating shaft is provided at the end of the slide bar away from the elastic element, and a roller is rotatably connected to the rotating shaft.

[0013] As a further improvement of the above-mentioned solution of this utility model, a vertically arranged pin is provided at the middle position of the top of each of the two semi-circular heat-conducting clamps of the clamp, and the two connecting rods of the clamp are respectively rotatably mounted on the two pins.

[0014] As a further improvement to the above-mentioned solution of this utility model, each slide rod is provided with a plurality of vertically arranged pins at intervals, and each pin is rotatably fitted with at least one connecting rod.

[0015] As a further improvement to the above-mentioned solution of this utility model, the outer surface of the semi-circular heat-conducting clamp is covered with Teflon tape, which not only ensures thermal conductivity but also reduces the risk of the clamps pinching or scratching the cylindrical battery.

[0016] As a further improvement of the above-mentioned solution of this utility model, the thickness of the Teflon tape is 0.1-0.15mm, and the Teflon tape has multiple through holes, which provides protection while improving thermal conductivity.

[0017] As a further improvement to the above-mentioned solution of this utility model, the tray body and multiple clamps are all made of aluminum, which has a high thermal conductivity and is lightweight.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The cylindrical battery baking tray provided by this utility model has clamps for holding cylindrical batteries in a receiving groove. After the cylindrical battery is placed in the receiving groove, the bottom of the cylindrical battery is supported by two arc-shaped plates. By rotating the two semi-circular heat-conducting clamps, the cylindrical battery can be clamped, increasing the contact area with the cylindrical battery. The arc-shaped plates of the clamps can directly contact the heating plate in the oven, which can quickly conduct heat to the cylindrical surface of the battery, accelerate the heating rate of the cylindrical battery, ensure the consistency of temperature between the bottom and top of the battery during the baking process, thereby improving the baking efficiency and ensuring the consistency of moisture in all parts of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a cylindrical battery baking tray in the prior art;

[0021] Figure 2 This is a schematic diagram of the structure of a cylindrical battery baking tray according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of a portion of the image;

[0023] Figure 4 This is a schematic diagram of the structure of a cylindrical battery baking tray in a released state, as proposed in an embodiment of this utility model.

[0024] Figure 5This is a schematic diagram of the structure of a cylindrical battery baking tray in a clamped state according to an embodiment of the present invention;

[0025] Figure 6 for Figure 5 Sectional view along line AA;

[0026] Figure 7 This is a schematic diagram of the Teflon tape structure in a cylindrical battery baking tray according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the temperature sensing line layout in the temperature rise detection embodiment of this utility model;

[0028] Figure 9 This is a temperature rise graph for the control group batteries;

[0029] Figure 10 The diagram shows the temperature rise of the batteries in the experimental group.

[0030] Figure 11 This is a schematic diagram showing the sampling location for moisture testing.

[0031] Reference numerals: 1. Tray body; 11. Receiving groove; 12. Slide groove; 2. Clamping piece; 21. Semi-circular heat-conducting clamping plate; 211. Hinge; 212. Pin one; 213. Teflon tape; 22. Arc-shaped support plate; 23. Connecting rod; 3. Slide rod; 31. Elastic element; 32. Roller; 33. Pin two; 4. Oven. Detailed Implementation

[0032] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] Reference Figures 2-3 This embodiment proposes a cylindrical battery baking tray, which includes a tray body 1 and multiple clamps 2.

[0035] The tray body 1 adopts an existing structural design and is square in shape. To improve baking efficiency, the tray body 1 is made of aluminum, which has a high thermal conductivity and is lightweight. Multiple parallel, spaced-apart grooves 12 are provided on the tray body 1, arranged in an alternating pattern. One end of each groove 12 is closed, and the other end extends through the side of the tray body 1. Each groove 12 is slidably connected to a sliding rod 3, and the sliding rods 3 are also arranged in an alternating pattern. An elastic element 31 is connected to the closed end of each sliding rod 3 near the groove 12. In this embodiment, the elastic element 31 is a spring, connected to the inner wall of the groove 12. The end of the sliding rod 3 away from the elastic element 31 extends out of the groove 12 and continues to extend outward. A vertically arranged rotating shaft is provided at the end of the sliding rod 3 away from the elastic element 31, and a roller 32 is rotatably connected to the rotating shaft.

[0036] In this embodiment, the length of the slide bar 3 needs to be reasonably designed based on the width of the oven 4 used for baking cylindrical batteries. It must be ensured that, in its natural state, the distance between the rollers 32 on two adjacent slide bars 3 is greater than the width of the oven 4. When the tray body 1 is pushed into the oven 4, the rollers 32 can roll against the inner wall of the oven 4, driving the slide bars 3 to move inward and compress the elastic element 31, thus reducing the distance between the rollers 32 on two adjacent slide bars 3. Each slide bar 3 is provided with multiple vertically arranged pins 33 at intervals.

[0037] Multiple spaced receiving slots 11 are provided on the pallet body 1 between any two adjacent slide rods 3, and the multiple receiving slots 11 between the two slide rods 3 are respectively provided in a one-to-one correspondence with multiple pins 33 on the slide rods 3. The receiving slots 11 are cylindrical slots that penetrate the pallet body 1.

[0038] Multiple clamps 2 are respectively disposed within multiple receiving slots 11 of the tray body 1. Figures 4-6 Each clamp 2 includes two semi-circular heat-conducting plates 21 and two connecting rods 23. The two semi-circular heat-conducting plates 21 of the clamp 2 are arranged opposite each other in the receiving groove 11. The radius of the semi-circular heat-conducting plates 21 is equal to the radius of the cylindrical battery to be baked, so as to ensure that the two semi-circular heat-conducting plates 21 can fully contact the cylindrical surface of the cylindrical battery when closed. The bottom of each of the two semi-circular heat-conducting plates 21 of the clamp 2 is connected to an arc-shaped support plate 22. The radius of the semi-circular heat-conducting plates and the arc-shaped support plate 22 are equal and the arc-shaped openings of the two arc-shaped support plates 22 are opposite each other. The outer surfaces of the semi-circular heat-conducting plates 21 and the arc-shaped support plate 22 are covered with Teflon tape 213, which ensures thermal conductivity and reduces the risk of the clamp 2 pinching or scratching the cylindrical battery. In this embodiment, the Teflon tape 213 is 0.13mm thick. Figure 7Multiple Φ2mm holes are punched in the Teflon tape 213, arranged in a 10mm*10mm matrix, providing protection while improving thermal conductivity. Two semi-circular heat-conducting clamps 21, located on opposite sides, are rotatably connected to the tray body 1 via hinges 211, with the midpoint of the line connecting the two hinges 211 located on the central axis of the receiving groove 11. Vertically arranged pins 212 are positioned at the top center of each of the two semi-circular heat-conducting clamps 21 of the clamp 2. One end of each of the two connecting rods 23 of the clamp 2 is rotatably mounted on the two pins 212, and the other end is rotatably mounted on the pins 33 of two adjacent slide rods 3. Thus, when the slide rods 3 move, the semi-circular heat-conducting clamps 21 can rotate within the receiving groove 11 via the connecting rods 23. Similarly, to improve baking efficiency, both the semi-circular heat-conducting clamps 21 and the arc-shaped tray 22 are made of aluminum, which has high thermal conductivity and is lightweight.

[0039] With the above structural configuration, in this embodiment, each clamp 2 has a clamping state and a releasing state. In the clamping state, the two semi-circular heat-conducting clamps 21 are close to the cylindrical battery and clamp it. In the releasing state, the two semi-circular heat-conducting clamps 21 are away from the cylindrical battery and released.

[0040] In this embodiment, when the cylindrical battery baking tray is in use, all elastic elements 31 are in a free state and all clamps 2 are in a released state while the tray is waiting to be loaded. The cylindrical battery is picked up by the robotic arm and placed into the receiving slot 11, with the bottom of the cylindrical battery supported by two arc-shaped support plates 22. When the tray body 1 enters the oven 4, the rollers 32 contact the inner wall of the oven 4, causing the slide bar 3 to move inward and squeeze the elastic elements 31. This causes the two semi-circular heat-conducting clamps 21 of each clamp 2 to rotate and come closer together to clamp the cylindrical battery. The bottom of the arc-shaped support plate 22 is in direct contact with the heating plate inside the oven 4, and the entire clamp 2 heats up rapidly. The clamp 2 makes full contact with the cylindrical battery, improving the heating speed of the cylindrical battery and the uniformity of the overall battery temperature. After baking, the tray body 1 is removed from the oven 4, and the slide bar 3, under the elastic force of the elastic elements 31, causes the clamps 2 to open, allowing the robotic arm to pick up and remove the cylindrical battery.

[0041] The following description uses a cylindrical battery as an example to further illustrate the cylindrical battery baking tray of this embodiment.

[0042] Cylindrical batteries from the same batch were randomly divided into two groups. One group served as the experimental group and was baked using the cylindrical battery baking tray of this embodiment for 10 hours. The other group served as the control group and was baked using... Figure 1 The baking tray shown is used for baking for 16 hours.

[0043] Both the experimental and control group cylindrical batteries underwent temperature rise testing during baking. The temperature rise testing method was as follows: Figure 8As shown, holes are drilled at the top, middle, and bottom of the cylindrical battery, reaching the center of the battery. Temperature sensing wires are then placed and fixed at each hole, and are respectively labeled as inner top, inner middle, and inner bottom.

[0044] During the baking process, the temperature rise of the two sets of cylindrical batteries was as follows: Figure 9 , Figure 10 As shown. From Figure 9 , Figure 10 As can be seen, using the cylindrical battery baking tray of this embodiment, with the cylindrical batteries held by the clamps, results in better temperature uniformity across the top, middle, and bottom of the battery. The control group batteries reached the preset temperature in about 90 minutes, while the experimental group batteries only needed about 60 minutes to reach the preset temperature, demonstrating that the cylindrical battery baking tray of this embodiment has a better baking and heating effect.

[0045] After baking, the moisture content of the batteries in the experimental and control groups was measured.

[0046] 1. Moisture content was measured using a Karl Fischer moisture analyzer;

[0047] 2. Moisture content standard: Mixed sample of positive and negative electrodes ≤200ppm;

[0048] 3. Moisture meter test settings: Test temperature 170℃, test time 300s;

[0049] 4. Sampling requirements: such as Figure 11 As shown, batteries were randomly selected from the experimental group and the control group, and positive and negative electrode mixed materials were obtained from the outer, middle and inner sides of the battery for testing. The sample weight was 30.2-0.4g.

[0050] The moisture test results are shown in Table 1.

[0051] Table 1 Moisture Test Results

[0052]

[0053] As can be seen from the results in Table 1, when using the cylindrical battery baking tray of this embodiment, the battery moisture content can reach the level that was originally achieved in 16 hours of baking in just 10 hours, improving efficiency by 6 hours per tray.

[0054] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0057] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cylindrical battery baking tray, characterized in that, It includes a tray body (1) and multiple clamps (2); multiple receiving slots (11) are formed on the tray body (1) and each receiving slot (11) penetrates the tray body (1); multiple clamps (2) are respectively disposed in multiple receiving slots (11), each clamp (2) includes two oppositely arranged semi-circular heat-conducting clamps (21), the bottom of the semi-circular heat-conducting clamps (21) is connected to an arc-shaped support plate (22), and the semi-circular heat-conducting clamps (21) are movably connected to the tray body (1); the clamps (2) have a clamping state and a releasing state. In the clamping state, the two semi-circular heat-conducting clamps (21) are close to clamping the cylindrical battery, and in the releasing state, the two semi-circular heat-conducting clamps (21) are away from the cylindrical battery and released.

2. The cylindrical battery baking tray according to claim 1, characterized in that, The two semi-circular heat-conducting clamps (21) of the clamp (2) are rotatably connected to the tray body (1) by hinges (211) on one side away from each other. The midpoint of the line connecting the two hinges (211) is on the central axis of the receiving groove (11).

3. The cylindrical battery baking tray according to claim 2, characterized in that, The upper surface of the tray body (1) is slidably connected with multiple parallel slide rods (3), and the slide rods (3) are arranged in an alternating manner. One end of the slide rod (3) is connected to the tray body (1) through an elastic element (31), and the other end extends outward from the tray body (1). Multiple spaced receiving slots (11) are provided between any two adjacent slide rods (3). The clamp (2) also includes two connecting rods (23), which are rotatably connected to two semi-circular heat-conducting clamps (21) respectively, and are rotatably connected to two adjacent slide rods (3) respectively.

4. The cylindrical battery baking tray according to claim 3, characterized in that, The upper surface of the pallet body (1) is provided with multiple staggered sliding grooves (12). One end of the sliding groove (12) is closed and the other end passes through the side of the pallet body (1). Multiple sliding rods (3) are slidably connected to multiple sliding grooves (12). The closed end of the sliding groove (12) is connected to an elastic element (31) and the elastic element (31) is connected to the corresponding sliding rod (3).

5. The cylindrical battery baking tray according to claim 3, characterized in that, The end of the slide bar (3) away from the elastic element (31) is provided with a vertically arranged pivot, and the pivot is rotatably connected to a roller (32).

6. The cylindrical battery baking tray according to claim 3, characterized in that, The two semi-circular heat-conducting plates (21) of the clamp (2) are each provided with a vertically arranged pin (212) at the middle of the top. The two connecting rods (23) of the clamp (2) are respectively rotatably mounted on the two pins (212).

7. The cylindrical battery baking tray according to claim 3, characterized in that, Each slide bar (3) is provided with a number of vertically arranged pins (33) at intervals, and each pin (33) is rotatably fitted with at least one connecting rod (23).

8. The cylindrical battery baking tray according to claim 1, characterized in that, The outer surface of the semi-circular heat-conducting clamp (21) is covered with Teflon tape (213).

9. The cylindrical battery baking tray according to claim 8, characterized in that, The thickness of the Teflon tape (213) is 0.1-0.15mm, and multiple through holes are provided on the Teflon tape (213).

10. The cylindrical battery baking tray according to claim 1, characterized in that, The pallet body (1) and multiple clamps (2) are all made of aluminum.

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