Lithium ion battery sealing nail

Abstract

The utility model relates to the technical field of lithium-ion batteries, and discloses a lithium-ion battery sealing nail. Comprising a sealing nail body, the sealing nail body is provided with a one-way air outlet channel, a piston rod is arranged in the one-way air outlet channel, the piston rod moves along the one-way air outlet channel, a vent hole is formed in the side wall of the piston rod, and a spring is arranged in the piston rod; a spring fixing ring is further arranged at the position, located at the upper end of the piston rod, in the one-way air outlet channel, the upper end of the spring is fixedly connected with the spring fixing ring, the lower end of the spring is fixedly connected with the piston rod, and a pressure sensor is fixedly installed at the bottom of the piston rod. The method has the advantage of improving the stability and safety of the battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery sealing nail technology, and in particular to a lithium-ion battery sealing nail. Background Technology

[0002] Currently, aluminum-cased lithium-ion batteries typically undergo a second electrolyte injection after formation, followed by soldering pins to complete the overall packaging. Although negative pressure formation is used during the formation stage, gas is still generated during subsequent charge and discharge processes such as capacity testing and SOC adjustment, resulting in excessively thick batteries and affecting their internal resistance, performance, and lifespan.

[0003] Therefore, a lithium-ion battery sealing nail is provided to solve the above problems. Summary of the Invention

[0004] The main purpose of this invention is to solve the problem that although negative pressure formation is used in the formation stage in the existing technology, gas is still generated in the subsequent charging and discharging processes such as capacity grading and SOC adjustment, resulting in an excessively thick battery and affecting the battery's internal resistance, performance and lifespan.

[0005] This utility model provides a lithium-ion battery sealing nail, the lithium-ion battery sealing nail comprising:

[0006] The sealing nail body has a one-way air outlet channel, and a piston rod is installed inside the one-way air outlet channel. The piston rod moves along the one-way air outlet channel, and a vent hole is opened on the side wall of the piston rod. A spring is installed inside the piston rod, and a spring retaining ring is also installed at the upper end of the piston rod in the one-way air outlet channel. The upper end of the spring is fixedly connected to the spring retaining ring, and the lower end of the spring is fixedly connected to the piston rod. A pressure sensor is fixedly installed at the bottom of the piston rod.

[0007] Furthermore, the one-way air outlet channel includes, from bottom to top, an air inlet channel, an air exchange channel, a piston channel, and an air outlet channel, which are connected in sequence.

[0008] Furthermore, the spring retaining ring is disposed at the connection between the piston channel and the air outlet channel.

[0009] Furthermore, a rubber sealing layer is provided at the contact position between the lower end of the piston rod and the connection between the air exchange channel and the air intake channel.

[0010] Furthermore, the diameter of the intake channel is smaller than the diameter of the ventilation channel, the diameter of the piston channel is smaller than the diameter of the ventilation channel, and the diameter of the exhaust channel is larger than the diameter of the piston channel.

[0011] Furthermore, an end cap is provided at the upper end of the air outlet channel, and an air outlet is provided on the side of the end cap.

[0012] Furthermore, a sealing and wear-resistant layer is provided on the side wall of the sealing nail body.

[0013] Furthermore, the pressure sensor is equipped with a Bluetooth module.

[0014] The lithium battery sealing nail proposed in this utility model can discharge the gas generated during the negative pressure formation stage through a one-way venting structure, which can prevent the gas generated during the negative pressure formation stage from affecting the internal resistance value and stability of the battery. In addition, this utility model is provided with an end cap with a vent hole on the side to prevent the electrolyte from being sprayed out through the one-way structure when the internal gas pressure is too high, thereby improving safety. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the first embodiment of the present invention under normal conditions;

[0016] Figure 2 This is a structural diagram of the first embodiment of the present invention under exhaust conditions;

[0017] Figure 3 A structural diagram of the first embodiment of this utility model installed on a battery;

[0018] Figure 4 This is a structural diagram of the second embodiment of the present invention. Detailed Implementation

[0019] This utility model provides a sealing nail for a lithium-ion battery, including a sealing nail body. The sealing nail body has a one-way venting channel, and a piston rod is disposed inside the one-way venting channel. The piston rod moves along the one-way venting channel, and a vent hole is provided on the side wall of the piston rod. A spring is disposed inside the piston rod, and a spring retaining ring is disposed at the upper end of the piston rod in the one-way venting channel. The upper end of the spring is fixedly connected to the spring retaining ring, and the lower end of the spring is fixedly connected to the piston rod. A pressure sensor is fixedly installed at the bottom of the piston rod. The main purpose of this utility model is to solve the problem in the prior art that although negative pressure formation is used in the formation stage, gas is still generated during subsequent charge and discharge processes such as capacity grading and SOC adjustment, resulting in an excessively thick battery and affecting the battery's internal resistance, performance, and lifespan.

[0020] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Example

[0022] refer to Figure 1-3 This embodiment provides a lithium-ion battery sealing nail, which includes:

[0023] The sealing nail body 1 has a one-way air outlet channel. A piston rod 4 is installed inside the one-way air outlet channel. The piston rod 4 moves along the one-way air outlet channel. A vent hole 401 is opened on the side wall of the piston rod 4. A spring 5 is installed inside the piston rod 4. A spring retaining ring 6 is also installed at the upper end of the piston rod 4 in the one-way air outlet channel. The upper end of the spring 5 is fixedly connected to the spring retaining ring 6, and the lower end of the spring 5 is fixedly connected to the piston rod 4. A pressure sensor 3 is fixedly installed at the bottom of the piston rod 4.

[0024] The one-way exhaust channel includes, from bottom to top, an intake channel 201, an air exchange channel 202, a piston channel 203, and an exhaust channel 204, which are connected in sequence.

[0025] The spring retaining ring 6 is located at the connection between the piston passage 2023 and the exhaust passage 204.

[0026] A rubber sealing layer is provided at the contact position between the lower end of the piston rod and the connection between the air exchange passage and the air intake passage.

[0027] The diameter of the intake passage is smaller than that of the exchange passage, the diameter of the piston passage is smaller than that of the exchange passage, and the diameter of the exhaust passage is larger than that of the piston passage. The smaller diameter of the intake passage allows the bottom of the piston rod in the exchange passage to completely block the intake passage when the internal air pressure is normal. The smaller diameter of the piston passage, which is the same as the piston rod diameter, facilitates the movement of the piston rod within the piston passage. It also allows the gas pushed up by the piston rod when the air pressure is too high to be discharged upwards through the vents on both sides.

[0028] The sealing pin body has a sealing and wear-resistant layer on its side wall. This allows for a better connection with the battery body and prevents electrolyte leakage.

[0029] During use, when gas is generated inside the battery, it enters through the air inlet channel, pushes the piston rod upward, and then exits through the air outlet channel through the vent holes on both sides and the inside of the piston rod.

[0030] Example

[0031] refer to Figure 4 This embodiment provides a lithium-ion battery sealing nail, which includes:

[0032] The sealing nail body 1 has a one-way air outlet channel. A piston rod 4 is installed inside the one-way air outlet channel. The piston rod 4 moves along the one-way air outlet channel. A vent hole 401 is opened on the side wall of the piston rod 4. A spring 5 is installed inside the piston rod 4. A spring retaining ring 6 is also installed at the upper end of the piston rod 4 in the one-way air outlet channel. The upper end of the spring 5 is fixedly connected to the spring retaining ring 6, and the lower end of the spring 5 is fixedly connected to the piston rod 4. A pressure sensor 3 is fixedly installed at the bottom of the piston rod 4.

[0033] The one-way exhaust channel includes, from bottom to top, an intake channel 201, an air exchange channel 202, a piston channel 203, and an exhaust channel 204, which are connected in sequence.

[0034] The spring retaining ring 6 is located at the connection between the piston passage 203 and the exhaust passage 204.

[0035] A rubber sealing layer is provided at the contact position between the lower end of the piston rod and the connection between the air exchange passage and the air intake passage.

[0036] The diameter of the intake passage is smaller than that of the exchange passage, the diameter of the piston passage is smaller than that of the exchange passage, the diameter of the piston passage is the same as that of the piston rod, and the diameter of the exhaust passage is larger than that of the piston passage. The smaller diameter of the intake passage allows the bottom of the piston rod in the exchange passage to completely block the intake passage when the internal air pressure is normal. The smaller diameter of the piston passage, which is the same as that of the piston rod, facilitates the movement of the piston rod within the piston passage. It also allows the gas pushed up by the piston rod when the air pressure is too high to be discharged upwards through the vents on both sides.

[0037] An end cap 7 is provided at the upper end of the venting channel, and a vent is provided on the side of the end cap. This prevents the electrolyte from being sprayed out when the internal gas pressure of the battery is too high, and prevents the electrolyte from splashing directly and causing injury to the operator.

[0038] The sealing pin body has a sealing and wear-resistant layer on its side wall. This allows for a better connection with the battery body and prevents electrolyte leakage.

[0039] During use, when gas is generated inside the battery, it enters through the air inlet channel, pushes the piston rod upward, and then exits through the air outlet channel through the vent holes on both sides and the inside of the piston rod.

[0040] Example

[0041] refer to Figure 4 This embodiment provides a lithium-ion battery sealing nail, which includes:

[0042] The sealing nail body 1 has a one-way air outlet channel. A piston rod 4 is installed inside the one-way air outlet channel. The piston rod 4 moves along the one-way air outlet channel. A vent hole 401 is opened on the side wall of the piston rod 4. A spring 5 is installed inside the piston rod 4. A spring retaining ring 6 is also installed at the upper end of the piston rod 4 in the one-way air outlet channel. The upper end of the spring 5 is fixedly connected to the spring retaining ring 6, and the lower end of the spring 5 is fixedly connected to the piston rod 4. A pressure sensor 3 is fixedly installed at the bottom of the piston rod 4.

[0043] The one-way exhaust channel includes, from bottom to top, an intake channel 201, an air exchange channel 202, a piston channel 203, and an exhaust channel 204, which are connected in sequence.

[0044] The spring retaining ring 6 is located at the connection between the piston passage 2023 and the exhaust passage 204.

[0045] A rubber sealing layer is provided at the contact position between the lower end of the piston rod and the connection between the air exchange passage and the air intake passage.

[0046] The diameter of the intake passage is smaller than that of the exchange passage, the diameter of the piston passage is smaller than that of the exchange passage, and the diameter of the exhaust passage is larger than that of the piston passage. The smaller diameter of the intake passage allows the bottom of the piston rod in the exchange passage to completely block the intake passage when the internal air pressure is normal. The smaller diameter of the piston passage, which is the same as the piston rod diameter, facilitates the movement of the piston rod within the piston passage. It also allows the gas pushed up by the piston rod when the air pressure is too high to be discharged upwards through the vents on both sides.

[0047] An end cap 7 is provided at the upper end of the venting channel, and a vent is provided on the side of the end cap. This prevents the electrolyte from being sprayed out when the internal gas pressure of the battery is too high, and prevents the electrolyte from splashing directly and causing injury to the operator.

[0048] The sealing pin body has a sealing and wear-resistant layer on its side wall. This allows for a better connection with the battery body and prevents electrolyte leakage.

[0049] The pressure sensor is equipped with a Bluetooth module. This allows the pressure sensor to interact with an external control device. When the pressure sensor detects that the pressure exceeds a preset value, the external control device will activate an alarm actuator. The external control device can be a microcontroller with a Bluetooth module, and the alarm actuator can be a red light warning light or a buzzer, etc.

[0050] During use, when gas is generated inside the battery, it enters through the air inlet channel, pushes the piston rod upward, and then exits through the air outlet channel through the vent holes on both sides and the inside of the piston rod.

[0051] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing nail for a lithium-ion battery, characterized in that, include: The sealing nail body has a one-way air outlet channel, and a piston rod is installed inside the one-way air outlet channel. The piston rod moves along the one-way air outlet channel, and a vent hole is opened on the side wall of the piston rod. A spring is installed inside the piston rod, and a spring retaining ring is also installed at the upper end of the piston rod in the one-way air outlet channel. The upper end of the spring is fixedly connected to the spring retaining ring, and the lower end of the spring is fixedly connected to the piston rod. A pressure sensor is fixedly installed at the bottom of the piston rod.

2. The lithium-ion battery sealing nail according to claim 1, characterized in that, The unidirectional air outlet channel includes, from bottom to top, an air inlet channel, an air exchange channel, a piston channel, and an air outlet channel, which are connected in sequence.

3. The lithium-ion battery sealing nail according to claim 2, characterized in that, The spring retaining ring is located at the connection between the piston channel and the air outlet channel.

4. The lithium-ion battery sealing nail according to claim 3, characterized in that, A rubber sealing layer is provided at the contact position between the lower end of the piston rod and the connection between the air exchange channel and the air intake channel.

5. The lithium-ion battery sealing nail according to claim 4, characterized in that, The diameter of the intake channel is smaller than the diameter of the exchange channel, the diameter of the piston channel is smaller than the diameter of the exchange channel, and the diameter of the exhaust channel is larger than the diameter of the piston channel.

6. The lithium-ion battery sealing nail according to claim 5, characterized in that, An end cap is provided at the upper end of the air outlet channel, and an air outlet is provided on the side of the end cap.

7. The lithium-ion battery sealing nail according to claim 6, characterized in that, A sealing and wear-resistant layer is provided on the side wall of the sealing nail body.

8. The lithium-ion battery sealing nail according to claim 7, characterized in that, The pressure sensor is equipped with a Bluetooth module.

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