Pre-charging exhaust structure of button lithium ion battery

Abstract

The pre-charging exhaust structure of the button type lithium ion battery comprises a battery shell, an exhaust hole is formed in the surface of one side of the battery shell, and one end of the exhaust hole is fixedly connected with a sealing welding spot; the pre-charging exhaust step is set, constant-temperature and constant-humidity maintaining equipment is omitted, the treatment step of environmental waste gas emission is omitted, special treatment is not needed in the transportation process, meanwhile, compared with a traditional pre-charging exhaust mode, the steps are simpler, and therefore the effects of saving materials, reducing emission and being high in exhaust efficiency are achieved; through arrangement of the exhaust holes and size setting of the exhaust holes, the safe and stable effect of the punching process can be guaranteed, meanwhile, the effects of use safety and high exhaust efficiency of the button type lithium ion battery in the later period can be guaranteed, and through arrangement of the sealing welding spots and size setting of the sealing welding spots, the sealing welding spots can form a strict sealing effect on the exhaust holes; therefore, the stable and safe effect of later use of the button lithium ion battery can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of button lithium-ion battery technology, and in particular to a pre-charge venting structure for button lithium-ion batteries. Background Technology

[0002] A button cell lithium-ion battery is a rechargeable battery that uses lithium-ion technology and has a button-like shape (usually much larger in diameter than in thickness).

[0003] Pre-charging of button lithium-ion batteries is a crucial and necessary process before they are used after manufacturing. After pre-charging, certain gases are generated inside the button lithium-ion battery due to the chemical reaction of the materials. If the gases are not discharged in time, the button lithium-ion battery may bulge or overheat.

[0004] Meanwhile, the commonly used venting method involves pre-drilling vent holes on the battery casing, plugging the holes with rubber stoppers after the battery is filled with electrolyte, and then pre-charging in a constant temperature and humidity environment in the pre-charging workshop. After pre-charging is completed, the button lithium-ion battery is placed in the venting device, the rubber stoppers are removed to vent the electrolyte, and the vent holes are sealed with a laser after venting. This method results in very low venting efficiency, and the pre-charging workshop, as well as the drilling and venting processes, all require a constant temperature and humidity environment, which necessitates the installation of some devices to maintain this environment, thus causing a certain waste of resources.

[0005] Therefore, we provide a pre-charge venting structure for coin cell lithium-ion batteries. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned technical problems by providing a pre-charge exhaust structure for button-type lithium-ion batteries, achieving high exhaust efficiency and reducing emissions.

[0007] In view of this, the present invention provides a pre-charge venting structure for a button lithium-ion battery, including a battery casing, wherein a venting hole is provided on one side surface of the battery casing, and a sealing solder joint is fixedly connected to one end of the venting hole.

[0008] Preferably, the vent hole has a size of 0.02mm-0.03mm, and one end of the vent hole extends into the inside of the battery casing.

[0009] Preferably, the thickness of the battery casing is 0.05mm-0.15mm.

[0010] Preferably, the sealing weld joint has a size of 0.2mm-0.5mm, and the sealing weld joint is used to seal the vent hole.

[0011] Preferably, the vent is located at a random position on one side edge of the battery casing, and a positive electrode cap is snapped onto the side of the battery casing away from the vent.

[0012] Preferably, the positive electrode cap is located at the center of the outer surface of the battery casing, and the positive electrode cap is used to protect the positive electrode of the battery.

[0013] Compared with the prior art, this utility model provides a pre-charge venting structure for button lithium-ion batteries, which has the following beneficial effects:

[0014] This invention eliminates the need for constant temperature and humidity maintenance equipment and environmental waste gas emission treatment steps by setting a pre-charging and exhaust step. It also eliminates the need for special treatment during transportation. Furthermore, compared with the traditional pre-charging and exhaust method, the steps of this application are simpler, thereby achieving the effects of saving materials, reducing emissions, and improving exhaust efficiency.

[0015] This invention, through the design of the vent hole and its size, ensures a safe and stable drilling process, while also guaranteeing the safety and high venting efficiency of the coin cell lithium-ion battery in later use.

[0016] This invention, by setting the sealing solder joint and its size, enables the sealing solder joint to form a strict sealing effect on the vent hole, thereby ensuring the stability and safety of the button lithium-ion battery in later use.

[0017] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the pre-charge venting structure of the button lithium-ion battery proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the exhaust port structure of the pre-charge exhaust structure of the button lithium-ion battery proposed in this utility model.

[0020] Figure 3 This is an enlarged schematic diagram of point A of the pre-charge venting structure of the button lithium-ion battery proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the battery casing of the pre-charge venting structure of the button lithium-ion battery proposed in this utility model.

[0022] Figure 5 This is an enlarged schematic diagram of section B of the pre-charge venting structure of the button lithium-ion battery proposed in this utility model.

[0023] Figure 6 This is a flowchart of the pre-charge and venting process for the button-type lithium-ion battery of this utility model.

[0024] In the diagram: 1. Battery casing; 2. Battery positive terminal cap; 3. Vent hole; 4. Sealing solder joint. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example: Pre-charge venting structure of a button lithium-ion battery, such as Figures 1-6 As shown, the device includes a battery casing 1 with a thickness of 0.05mm-0.15mm. A positive electrode cap 2 is snapped onto the side of the battery casing 1 away from the vent 3, protecting the positive electrode. The positive electrode cap 2 is located at the center of the outer surface of the battery casing 1. A vent 3 is provided on one side of the battery casing 1, randomly positioned at the edge of the side surface. This reduces damage to the structural strength of the battery casing 1, improves its resistance to drops and compression, and reduces the probability of damage to the inside of the button lithium-ion battery during laser drilling, thus ensuring safe and stable drilling results. Additionally, the gas generated during pre-charging tends to accumulate in the edge area, therefore the vent 3... The location setting can shorten the gas venting channel and time, thereby reducing the amount of gas remaining inside the battery and avoiding malfunctions of the coin cell lithium-ion battery due to gas expansion during later use. The size of the venting hole 3 is 0.02mm-0.03mm, and one end of the venting hole 3 extends into the inside of the battery casing 1. A sealing solder point 4 is fixedly connected to one end of the venting hole 3. The sealing solder point 4 is used to seal the venting hole 3. The size of the sealing solder point 4 is 0.2mm-0.5mm. The size setting of the sealing solder point 4 can form a strict sealing effect and avoid the situation where the sealing solder point 4 is too small, which would lead to incomplete sealing of the venting hole 3 and cause malfunctions such as leakage of the coin cell lithium-ion battery during later use.

[0028] The pre-charge venting method for the pre-charge venting structure of a button-type lithium-ion battery includes the following steps:

[0029] Step 1: Perform the first pre-charge on the assembled coin cell lithium-ion battery;

[0030] Step 2: After pre-charging is completed, a vent hole 3 with a size of 0.02mm-0.03mm is laser-machined on the edge area of ​​the battery casing 1;

[0031] The pre-charge venting method for the pre-charge venting structure of a button-type lithium-ion battery includes the following steps:

[0032] Step 3: After the vent hole 3 is processed, the coin cell lithium-ion battery is vented to release the gas generated inside the coin cell lithium-ion battery during the pre-charging process.

[0033] Step 4: After the gas is discharged, the exhaust hole 3 is sealed by laser welding to form a sealing weld point 4 with a size of 0.2mm-0.5mm;

[0034] By adopting the above-mentioned pre-charging and venting steps, there is no need to reserve the venting hole 3 for the button lithium-ion battery. Furthermore, the pre-charging workshop, drilling device, and venting device do not require constant temperature and humidity control, thus eliminating the need to treat the environmental waste gas emissions from the workshop. At the same time, the button lithium-ion battery does not require special treatment of the operating facilities during operation, achieving the purpose of saving materials and reducing emissions. Moreover, compared with the traditional pre-charging and venting steps, the steps in this application are simpler, more stable, and safer.

[0035] When drilling holes in a coin cell lithium-ion battery, the coin cell lithium-ion battery is placed inside the drilling device, and then the laser inside the drilling device is used to drill the hole. After that, it is placed inside the venting device to vent the air. The drilling device and the venting device are well-known and mature technologies in this field, and will not be described in detail here.

[0036] The voltage, time, and temperature of the initial pre-charge, as well as the laser power, processing speed, exhaust pressure, time, and ambient temperature for drilling, are well-known and mature technologies in this field, and will not be elaborated here.

[0037] Working principle: After the pre-charging of the coin cell lithium-ion battery is completed, the coin cell lithium-ion battery is first placed into the drilling device. Under the protection of the inert gas in the drilling device, laser drilling is performed so that the vent hole 3 is opened on one side edge of the battery casing 1. The positive electrode cap 2 of the battery can protect the positive electrode of the battery. After the drilling is completed, the coin cell lithium-ion battery is placed in the venting device for venting. The gas generated in the coin cell lithium-ion battery can be discharged through the vent hole 3. Then, the coin cell lithium-ion battery is placed in the drilling device and the vent hole 3 is sealed under the protection of the inert gas. The sealing solder point 4 is fixed at the upper end of the vent hole 3, thereby completing the pre-charging venting of the coin cell lithium-ion battery.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pre-charge venting structure for a button-type lithium-ion battery, comprising a battery casing (1), characterized in that, The battery casing (1) has an exhaust hole (3) on one side surface, and a sealing weld point (4) is fixedly connected to one end of the exhaust hole (3).

2. The pre-charge venting structure for a button-type lithium-ion battery according to claim 1, characterized in that, The vent (3) has a size of 0.02mm-0.03mm, and one end of the vent (3) extends into the inside of the battery casing (1).

3. The pre-charge venting structure for a button-type lithium-ion battery according to claim 2, characterized in that, The thickness of the battery casing (1) is 0.05mm-0.15mm.

4. The pre-charge venting structure for a button-type lithium-ion battery according to claim 1, characterized in that, The sealing weld point (4) has a size of 0.2mm-0.5mm and is used to seal the vent hole (3).

5. The pre-charge venting structure for a button-type lithium-ion battery according to claim 4, characterized in that, The vent (3) is opened at a random position on one side of the surface edge of the battery casing (1), and the battery positive cap (2) is snapped onto the side of the battery casing (1) away from the vent (3).

6. The pre-charge venting structure for a button-type lithium-ion battery according to claim 5, characterized in that, The battery positive electrode cap (2) is located at the center of the outer surface of the battery casing (1), and the battery positive electrode cap (2) is used to protect the battery positive electrode.

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