Preparation method of drainage strip asbestos sleeve for high-voltage thermal battery

Abstract

The invention provides a preparation method of a drainage strip asbestos sleeve for a high-voltage thermal battery, which is characterized by comprising the following steps: step 1, placing a positioning tool in the middle of wide asbestos, folding the asbestos on the two sides inwards in sequence, and wrapping the positioning tool by the asbestos after folding. And 2, fixing and sealing the folded asbestos by using a pressure-sensitive insulating tape, observing that the asbestos completely wraps the positioning tool by eyes, and then longitudinally winding the pressure-sensitive insulating tape. And 3, cutting to remove the pressure-sensitive insulating adhesive tape exceeding the length of asbestos at two ends of the asbestos sleeve, and then taking out the positioning tool to obtain the three-layer asbestos sleeve. The preparation method is simple in preparation process and high in repeatability, the prepared three-layer asbestos sleeve is high in reliability in the high-voltage thermal battery, practical significance is achieved for improvement of an original drainage strip protection method, and the requirement for large-scale production is met.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a method for preparing a drainage strip asbestos sleeve for a high-voltage thermal battery. Background Art

[0002] Thermal batteries are mainly composed of unit cells, electrical interfaces and mechanical interfaces. Unit cells are the core components of thermal batteries to generate output electrical energy. The electrical performance of unit cells determines whether the overall output of the battery meets the requirements of technical conditions and successfully completes the power supply task. In unit cells, the main components are battery stacks, battery shells and battery covers. Whether the battery stack can output electrical energy normally determines whether the thermal battery can work normally. The battery stack conducts electrical energy through the metal drain strips with good conductivity on the side, so the insulation protection of the drain strips is related to whether the battery can work safely and normally.

[0003] Thermal batteries are heat-activated storage batteries that melt non-conductive solid salt electrolytes into liquid ionic conductors to conduct the positive and negative electrodes by increasing the working environment temperature. Salt electrolytes change from solid to liquid at a certain temperature, and liquid salts have strong conductivity. After the thermal battery is activated, the internal temperature rises, and the internal temperature can reach over 400°C during operation. In high temperature environments, the internal resistance of the battery is generally reduced, and the relative distance between the metal drain bar and the battery stack is close, which makes it easy for high-voltage breakdown and current arcing to occur, leading to battery failure.

[0004] Regarding the insulation protection of the drain bar, the method disclosed in patent document CN104701483A (a method for insulation protection of thermal battery drain bars) is only applicable to low-voltage batteries, and high-voltage breakdown will still occur in high-voltage batteries above 60V. At present, in the design of thermal batteries, more and more high-voltage batteries are needed, so it is very important to improve the insulation protection measures of the drain bar. Summary of the invention

[0005] In order to realize the insulation protection of the drain strip of the above-mentioned high-voltage battery, the present invention provides a method for preparing an asbestos sleeve of a drain strip for a high-voltage thermal battery, which is characterized by comprising the following steps:

[0006] Step 1: Place the positioning tool in the middle of the wide asbestos, fold the asbestos on both sides inwards one by one, and wrap the positioning tool with the asbestos after folding;

[0007] Step 2: Use pressure-sensitive insulating tape to fix and seal the folded asbestos, visually check that the asbestos completely covers the positioning tool, and then wrap the pressure-sensitive insulating tape longitudinally;

[0008] Step 3: Cut and remove the pressure-sensitive insulating tape at both ends of the asbestos sleeve that exceeds the length of the asbestos, and then take out the positioning tool to obtain a three-layer asbestos sleeve.

[0009] Furthermore, the asbestos sleeve is used for insulation protection of high-voltage thermal battery drain strips.

[0010] Furthermore, a positioning tool with a width of 14.5 mm and a thickness of 0.5 mm was made and placed in the middle of the 38 mm wide asbestos.

[0011] Furthermore, the asbestos sleeve is completely wrapped with pressure-sensitive insulating tape.

[0012] Furthermore, the preferred method of wrapping the pressure-sensitive insulating tape is to wrap 1 to 2 turns of the pressure-sensitive insulating tape longitudinally every 40 mm to 60 mm.

[0013] Furthermore, in step three, the three-layer asbestos sleeve consists of two inner layers and one outer layer.

[0014] The asbestos sleeve preparation process designed by the present invention not only takes into account the insulation protection of the drain strip and the size of the battery stack, but also takes into account the working mechanical environment of the thermal battery. The three-layer asbestos sleeve structure can not only protect the drain strip from being exposed to the air, but also the asbestos sleeve is sufficiently reliable in wrapping and protecting the drain strip under mechanical environments such as impact vibration. The internal two-layer design also improves the insulation performance between the drain strip and the battery stack. At the same time, the preparation process of the three-layer asbestos sleeve is simple and easy to operate, and the quality and reliability of the prepared finished product can be guaranteed after adding a positioning tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a three-layer asbestos sleeve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific operating process methods.

[0017] The preparation method of the asbestos sleeve for the drain strip of the high-voltage thermal battery of the present invention is a reliable three-layer asbestos sleeve preparation method, and a three-layer asbestos sleeve is prepared, the asbestos sleeve has one outer layer and two inner layers, and is used for the insulation protection of the drain strip of the high-voltage thermal battery.

[0018] The method for preparing a drainage strip asbestos sleeve for a high-voltage thermal battery of the present invention comprises the following steps:

[0019] Step 1: Place the positioning tool in the middle of the wide asbestos, fold the asbestos on both sides inwards one by one, and wrap the positioning tool with the asbestos after folding. By using the positioning tool to assist the asbestos sleeve wrapping, the error generated during the asbestos folding process can be reduced.

[0020] Step 2: Use pressure-sensitive insulating tape to fix and seal the folded asbestos, visually observe that the asbestos completely covers the positioning tool, and then wrap the pressure-sensitive insulating tape longitudinally. The method of wrapping the pressure-sensitive insulating tape is preferably to wrap 1 to 2 turns of the pressure-sensitive insulating tape longitudinally every 40 mm to 60 mm. Preferably, the asbestos sleeve is completely wrapped with the pressure-sensitive insulating tape.

[0021] Step 3: Cut and remove the pressure-sensitive insulating tapes at both ends of the asbestos sleeve that exceed the length of the asbestos, and then remove the positioning tool to obtain a three-layer asbestos sleeve. The three-layer asbestos sleeve has two inner layers and one outer layer.

[0022] The preparation method of the invention has a simple preparation process and strong repeatability. The prepared three-layer asbestos sleeve has high reliability in high-voltage thermal batteries, has practical significance for improving the original drainage strip protection method, and meets the requirements of large-scale production.

[0023] Example

[0024] A three-layer asbestos sleeve for a high-voltage battery drainage strip was prepared according to the following method: in order to reduce the error generated during the folding process of the asbestos, a positioning tool with a width of 14.5 mm and a thickness of 0.5 mm was made and placed in the middle of the 38 mm wide asbestos. The asbestos on both sides were folded inward in turn, and the asbestos wrapped the positioning tool after folding; the folded asbestos was fixed and sealed with pressure-sensitive insulating tape, and the asbestos was visually completely wrapped around the positioning tool, and then 1 to 2 turns of tape were wrapped longitudinally every 40 mm to 60 mm; the pressure-sensitive insulating tape at both ends of the asbestos sleeve that exceeded the length of the asbestos was cut and removed, and then the positioning tool was taken out.

[0025] Figure 1 This is a schematic diagram of the structure of the three-layer asbestos sleeve provided by the embodiment of the present invention. Figure 1 The opening of the asbestos sleeve prepared in the embodiment of the present invention is 14.5 mm×0.5 mm.

[0026] The working voltage range of this unit battery is 68V~85V, the diameter of the battery stack is 56mm, and the height is 147mm; there are two positive and negative drain bars for power output, and the sizes of the drain bars are 200mm×5mm×0.1mm and 80mm×5mm×0.1mm respectively. The drain bars are protected by a three-layer asbestos sleeve, and the preparation method of the three-layer asbestos sleeve is as described above. The battery was tested for electrical performance under 11.4g vibration conditions, and the battery voltage output was normal. It was safe and reliable during operation, and no abnormal phenomenon occurred.

[0027] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a drainage strip asbestos sleeve for a high-voltage thermal battery, characterized in that: The following steps are involved: Step 1: Place the positioning tool in the middle of the wide asbestos, fold the asbestos on both sides inwards one by one, and wrap the positioning tool with the asbestos after folding; Step 2: Use pressure-sensitive insulating tape to fix and seal the folded asbestos, visually check that the asbestos completely covers the positioning tool, and then wrap the pressure-sensitive insulating tape longitudinally; Step 3: Cut and remove the pressure-sensitive insulating tape at both ends of the asbestos sleeve that exceeds the length of the asbestos, and then take out the positioning tool to obtain a three-layer asbestos sleeve.

2. The method for preparing the drainage strip asbestos sleeve for high-voltage thermal battery according to claim 1, characterized in that: The asbestos sleeve is used for insulation protection of high-voltage thermal battery drain strips.

3. The method for preparing the drainage strip asbestos sleeve for high-voltage thermal battery according to claim 1, characterized in that: In step 1, a positioning tool with a width of 14.5 mm and a thickness of 0.5 mm is made and placed in the middle of the 38 mm wide asbestos.

4. The method for preparing the drainage strip asbestos sleeve for high-voltage thermal battery according to claim 1, characterized in that: In step two, the asbestos sleeve is completely wrapped with pressure-sensitive insulating tape.

5. The method for preparing the drainage strip asbestos sleeve for high-voltage thermal battery according to claim 1, characterized in that: In step 2, the method of wrapping the pressure-sensitive insulating tape is preferably to wrap 1 to 2 turns of the pressure-sensitive insulating tape longitudinally every 40 mm to 60 mm.

6. The method for preparing the drainage strip asbestos sleeve for high-voltage thermal battery according to claim 1, characterized in that: In step three, the three-layer asbestos sleeve consists of two inner layers and one outer layer.

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