Electrolyte-resistant volume-expandable lithium battery adhesive tape

Abstract

The utility model discloses an electrolyte-resistant volume-expandable lithium battery adhesive tape, which relates to the technical field of adhesive tapes, and comprises a termination adhesive tape, an expansion layer and a low-uncovering-force layer, the termination adhesive tape is used for insulating and fixing the termination part of a lithium ion battery cell, the expansion layer is coated on the outer side of the termination adhesive tape, and the low-uncovering-force layer is coated on the outer side of the expansion layer. The expansion layer has excellent elasticity and expansion performance and can deform, absorb and relieve pressure generated by the battery and protect structural parts in a battery pack from being damaged when the volume of the battery is expanded, and the thermoplastic polyurethane expansion layer has excellent elasticity and expansion performance and can flexibly cope with volume change in the charging and discharging process of the battery, so that the battery pack is more stable in charging and discharging. According to the present invention, the thermoplastic polyurethane has the excellent electrolyte resistance, can maintain the stability and can not be corroded or degraded in the complex electrochemical environment, such that the service life of the adhesive tape and the service life of the battery system can be prolonged, and the pressure generated by the adhesive tape can be absorbed and relieved so as to effectively prevent the battery case from cracking and the electrolyte leakage, and significantly improve the safety of the battery system.

Description

Technical Field

[0001] The utility model relates to the technical field of tapes, in particular to a lithium battery tape that is resistant to electrolyte and can expand in volume. Background Technique

[0002] With the rapid development of new energy vehicles, portable electronic devices and energy storage systems, lithium-ion batteries, as their core energy sources, their performance and safety have become the focus of attention in the industry. During the charge and discharge cycle of lithium batteries, due to internal chemical reactions and the insertion and extraction of lithium ions, there is often a certain degree of volume change. Especially for high-energy density batteries, the volume expansion phenomenon is more significant. If this volume expansion cannot be effectively controlled, it will not only lead to stress concentration in the internal structure of the battery, but also may cause serious problems such as battery shell rupture and electrolyte leakage, thereby affecting the overall safety and service life of the battery system.

[0003] Traditional lithium battery tapes mostly adopt a single material design, which is difficult to simultaneously meet the requirements of high-strength support, resistance to electrolyte corrosion and adaptation to volume changes. Therefore, we propose a lithium battery tape that is resistant to electrolyte and can expand in volume, which can effectively resist electrolyte erosion and at the same time has good volume expansion adaptability to ensure the long-term stable operation of the battery system. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a lithium battery tape that is resistant to electrolyte and can expand in volume, and solves the problems put forward in the above background technique.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A lithium battery tape that is resistant to electrolyte and can expand in volume, including:

[0006] A termination tape, which is used for insulating and fixing the termination part of the lithium-ion battery cell;

[0007] An expansion layer, which is coated on the outside of the termination tape. The expansion layer has excellent elasticity and expansion performance, and can deform when the battery volume expands, absorb and relieve the pressure generated by the battery, and protect the structural components in the battery pack from damage.

[0008] Further, the lithium battery tape that is resistant to electrolyte and can expand in volume further includes:

[0009] A low peel force layer, which is coated on the outside of the expansion layer, so that the tape has a small sound and low resistance when being peeled off, improving the use experience.

[0010] Further, for the lithium battery tape that is resistant to electrolyte and can expand in volume, the material of the expansion layer is thermoplastic polyurethane.

[0011] Furthermore, for the electrolyte-resistant and volume-expandable lithium battery tape, the material of the low-release force layer is a silicone release agent layer.

[0012] Furthermore, the termination tape includes:

[0013] A substrate layer;

[0014] An adhesive layer, which is coated on the inner side of the substrate layer and can closely adhere to the battery surface to form an effective isolation layer.

[0015] Furthermore, the material of the substrate layer is polyethylene terephthalate, and the material of the adhesive layer is acrylic adhesive.

[0016] Compared with the above background technology, the electrolyte-resistant and volume-expandable lithium battery tape provided by the present application includes a termination tape, an expansion layer, and a low-release force layer. The expansion layer uses thermoplastic polyurethane, enabling the tape to effectively cope with the volume expansion that may occur during the charging and discharging process of the lithium battery. The excellent elasticity and expansion performance of the expansion layer 2 can deform, absorb, and relieve the pressure generated by the volume change of the battery, reducing safety risks such as battery rupture and leakage caused by battery expansion.

[0017] The present utility model provides an electrolyte-resistant and volume-expandable lithium battery tape. Compared with the prior art, it has the following beneficial effects:

[0018] 1. For an electrolyte-resistant and volume-expandable lithium battery tape, the thermoplastic polyurethane expansion layer has excellent elasticity and expansion performance, can flexibly cope with the volume change during the charging and discharging process of the battery, absorb and relieve the resulting pressure, effectively prevent the battery shell from cracking and electrolyte leakage, significantly improve the safety of the battery system, and thermoplastic polyurethane has excellent electrolyte resistance and can remain stable in a complex electrochemical environment without being corroded or degraded, extending the service life of the tape and the battery system.

[0019] 2. For an electrolyte-resistant and volume-expandable lithium battery tape, by using a silicone release agent for the low-release force layer, the resistance and noise during tape peeling are reduced, making the maintenance and replacement of the battery pack more convenient and fast, and improving the user's operation experience. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an electrolyte-resistant and volume-expandable lithium battery tape;

[0021] Figure 2 It is a plan view of an electrolyte-resistant and volume-expandable lithium battery tape.

[0022] In the figure: 1. Termination tape; 11. Substrate layer; 12. Adhesive layer; 2. Expansion layer; 3. Low-release force layer. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-2 , the utility model provides a technical solution for a lithium battery tape that is resistant to electrolyte volume expansion: a lithium battery tape that is resistant to electrolyte volume expansion, comprising a termination tape 1, an expansion layer 2 and a low peeling force layer 3. Specifically, the termination tape 1 comprises a substrate layer 11 and a glue layer 12. The substrate layer 11 is made of polyethylene terephthalate, which provides high-strength support for the tape, ensuring that the tape is not easily deformed or broken when subjected to battery expansion pressure, thereby maintaining the stability and reliability of the entire tape structure. The high-strength characteristics of the substrate layer 11 help to disperse the expansion pressure absorbed by the expansion layer 2 to the entire tape structure, further enhancing the protective effect against battery expansion. The glue layer 12 uses a combination of acrylic glue to ensure that the tape can fit tightly to the battery surface to form an effective isolation layer. This tight fit not only helps to prevent further erosion of the battery by the electrolyte, but also can tightly combine the battery and the tape together through the adhesion of the glue layer, achieving both an insulation effect and ensuring the reliability of fixation;

[0025] By adopting the expansion layer 2 of thermoplastic polyurethane, the adhesive tape can effectively cope with the volume expansion that may occur in the lithium battery during the charging and discharging process. The excellent elasticity and expansion performance of the expansion layer 2 can be deformed to absorb and relieve the pressure generated by the battery due to the volume change, reducing the safety risks such as rupture and leakage caused by battery expansion, improving the overall safety of the battery system, thereby protecting other structural parts in the battery pack from damage and extending the overall service life of the battery. In addition, the thermoplastic polyurethane material has not only good elasticity and expansion, but also excellent electrolyte resistance, and can remain stable in the electrolyte environment and is not easy to corrode or fail.

[0026] The low peeling force layer 3 adopts a silicone oil release agent layer. Silicone oil has good lubricity and low friction coefficient, which makes the tape quiet and has low resistance when peeling off. This feature not only facilitates the maintenance and replacement of the battery pack, but also improves the user's operating experience.

[0027] The electrolyte-resistant and volume-expandable lithium battery tape: During use, when the battery expands in volume, the expansion layer 2 first deforms and absorbs part of the pressure. Subsequently, the substrate layer 11 and the adhesive layer 12 work together to disperse the remaining pressure over the entire tape structure. This combined effect effectively alleviates the pressure exerted by the battery expansion on the surrounding structural components, protecting other components within the battery pack from damage.

Claims

1. A lithium battery tape resistant to electrolyte expansion, characterized in that: include: A termination tape (1), wherein the termination tape (1) is used for insulating and fixing the termination portion of a lithium-ion battery cell; The expansion layer (2) is coated on the outer side of the termination tape (1), and the expansion layer (2) has excellent elasticity and expansion performance, and can deform when the battery volume expands, absorb and relieve the pressure generated by the battery, and protect the structural parts in the battery pack from damage.

2. The lithium battery tape resistant to electrolyte expansion according to claim 1, characterized in that: Also includes: The low peeling force layer (3) is coated on the outer side of the expansion layer (2), so that the tape has low noise and low resistance when peeling off, thereby improving the user experience.

3. The lithium battery tape resistant to electrolyte expansion according to claim 1, characterized in that: The material of the expansion layer (2) is thermoplastic polyurethane.

4. The lithium battery tape resistant to electrolyte expansion according to claim 2, characterized in that: The material of the low peeling force layer (3) is a silicone oil release agent layer.

5. The lithium battery tape resistant to electrolyte expansion according to claim 1, characterized in that: The termination tape (1) comprises: A substrate layer (11); The glue layer (12) is coated on the inner side of the substrate layer (11) and can be closely attached to the surface of the battery to form an effective isolation layer.

6. The lithium battery tape resistant to electrolyte expansion according to claim 5, characterized in that: The material of the substrate layer (11) is polyethylene terephthalate, and the material of the glue layer (12) is acrylic glue.

Images