The new energy vehicle industry is the trendsetter and goal of global automotive industry development, with China emerging as the world’s largest market for new energy vehicles. The adhesive tape used in the lithium battery industry has an average consumption of approximately 6 square meters per battery PACK。

Yousan Technology will guide you to understand these adhesive tapes. First, we need to have a basic understanding of the structure of battery PACK. Battery PACK is a composite battery, mainly used to process and combine battery cores, battery protection boards, battery connecting pieces, label papers, etc., into products required by customers through the battery PACK process.

Typical applications of adhesive tape：

Location	Tape name	application
Inside the cell	Lithium battery termination tape	Bonding of termination parts within the cell
Extreme Ear Tape	Extreme ear bonding, wrapping protection
Soft pack battery protective film	Protective battery for the process
Outside the battery core	Power insulation Blue film tape	Surface protection for square batteries
	Expansion tape	Cylindrical battery wrapping cushioning
	Single Side Kapton Tape	Wrapping around the edges of the battery, wrapping around the terminals
	Double Sided Flame Retardant Tape	Adhering foam padding, etc
	Thermal Conductive Silicone Pad	thermal conductivity
	Black insulated heat shrink film	Side panel insulation protection

1、Kapton tape

Kapton tape is used for sealing and bottom insulation protection, as well as bundling and fixing of lithium-ion battery steel shell, aluminum shell, cylindrical, pouch cells, and power battery packaging cells.

P0105A kapton tape product performance table

Test items	Typical value	Unit	Test method
color	dark brown	–	Visual inspection
Type of glue	Acrylate adhesive	–	–
base material thickness	0.025	mm	ASTM D-3652
Total thickness	0.05	mm	ASTM D-3652
Peel strength（180°）	7（2.8）	N/inch（N/cm）	ASTM D-3330
Tensile strength	100（40）	N/inch（N/cm）	ASTM D-3759
elongation	45	%	ASTM D-3759
Short term temperature	150	℃	GB∕T 32368-2015
Long term temperature	100	℃	GB∕T 32368-2015

2、Lithium battery termination tape

Lithium battery termination tape is coated with a unique acrylic or rubber pressure-sensitive adhesive on PET polyester film to resist electrolyte corrosion. It features strong resistance to electrolyte, high adhesion, flexibility, environmental friendliness, and halogen-free properties. Additionally, for ease of tracking and tracing in the production line, termination tape can be made into digital tape. This means Arabic numerals are first printed on the film substrate before applying the pressure-sensitive adhesive.

It is specifically designed for insulation protection and fixing of various aluminum shell, steel shell, and pouch battery cells such as lithium/nickel/cadmium. It can be used for bonding and fixing at the positive and negative electrode tabs, insulation and protection of electrode tabs, sealing edges of lithium batteries, and providing high electrical insulation. It is suitable for fixing insulation parts of battery cells.

P22022 Lithium battery termination tape product performance table

Test items	Typical value	Unit	Test method
Color	Grass green	–	Visual inspection
Type of glue	Acrylic adhesive	–	–
Base material	PET(0.016MM)	–	–
Total thickness	0.022	mm	ASTM D-3652
Peel strength（180°）	200-300	g/inch	ASTM D-1000
Tensile strength	20	N/25mm	ASTM D-1000
Resistance of the electrolyte	through	/	GB/T 30776-2014
Long term service temperature	80	℃	GB∕T 32368-2015
Short term service temperature	120	℃	GB∕T 32368-2015

3、Power insulation blue film tape

With the rise of power batteries, the emergence of double-layer protective films for power has also come into being. It is obvious that the protective film originally used for pouch batteries can no longer meet the technological developments and advancements in power battery packaging. As a result, double-layer blue films have appeared on the historical stage along with the times.

The power insulation blue film tape consists of a double-layer PET substrate coated with acrylic adhesive, serving as both appearance protection and insulation during pack assembly. It possesses excellent electrical and mechanical properties of the film while also offering stability and good adhesion performance. The double-layer composite substrate is soft, prevents curling during bending and pasting, leaves no residue, and has strong resistance to puncture, penetration, and high temperatures. It meets the performance requirements for power battery packaging。

The performance characteristics of power insulation blue film tape：

Items	Unit	P75110	P7580	P75110-1
color	–	blue	blue	blue
Type of glue	–	Acrylic	Acrylic	Acrylic
base material	–	PET	PET	PET
Total thickness	um	110±5	80±5	110±5
Peel strength（180°）	g/25mm	≥10	≥12	≥15
tensile strength	MPa	≥150	≥100	≥150
Breakdown voltage	KV	AC>2.23	AC>2.23	AC>2.23
breakdown voltage	KV	DC>3.15	DC>3.15	DC>3.15
insulation resistance	Ω	≥200	≥200	≥200
environment protection	–	Pass	Pass	Pass
Temperature resistance	℃	100-130	100-130	100-130

4、Soft pack battery protective film

Soft pack battery protective film, also known as process protective film, is made from transparent PET or BOPP film that has been corona-treated. It is then coated with special pressure-sensitive adhesive of various colors and processed through hot air drying. It is heat-resistant, highly adhesive, leaves no residue upon removal, does not fade, has excellent light transmittance, good stiffness, and is easy to die-cut. The protective film is used for the protection of soft pack batteries in the manufacturing process. Since lithium batteries require high cleanliness, the process requirements for protective films are also relatively high. The protective film must have low static, high adhesion, and resistance to high temperatures without leaving adhesive residue. It is also required to maintain performance during various uses, ensuring no curling, no loss or sticking of labels. Originally transparent, protective films were difficult to identify, but after improvements, they are often made in blue.

The performance characteristics of soft pack battery protective film

Items	Unit	P4055B	P4055T	P4575B	P4555B	P4555T
color	–	Blue	Transparent	Blue	Blue	Transparent
Type of glue	–	Acrylic	Acrylic	Acrylic	Acrylic	Acrylic
base material	–	PET	PET	BOPP	BOPP	BOPP
Total thickness	um	55±5	55±5	75±5	55±5	55±5
Peel strength（180°）	g/25mm	0.08±0.02	0.08±0.02	0.15±0.02	0.08±0.02	0.08±0.02
Tensile strength	MPa	≥100	≥100	≥100	≥80	≥80
Temperature resistance	℃	100-130	100-130	100-120	100-120	100-120
Environment protection	–	PASS	PASS	PASS	PASS	PASS

5、Double Sided Flame Retardant Tape

The flame-retardant double-sided adhesive tape is made from cotton paper/PET as the substrate, coated with flame-retardant acrylic pressure-sensitive adhesive on both sides, or made into a flame-retardant adhesive tape without substrate using flame-retardant adhesive. It has high flame retardancy, fire resistance, strong adhesion, good tackiness, and excellent bonding to a variety of materials. It is mainly used for bonding components such as foam pads in lithium battery packs.

Product performance table of flame retardant tape

Test items	Test method	Unit	P3110F
Color	Visual inspection	–	White
Type of glue	–	–	Flame retardant acrylic adhesive
Release material	–	–	Release paper
Base material	–	–	TISSUE
Total thickness	ASTM D-3652	mm	0.10
Flame retardant standards	UL94	N/A	VTM-0
180°Peel strength（SUS，20min）	GB/T2792-2014	N/inch	10
Static shear force （24mm*24mm）1000g，5.76cm2	GB/T4851-2014	min	≥30
Long term temperature resistance	GB∕T 4851-2014	℃	80
Short term temperature resistance	GB∕T 4851-2014	℃	120

6、The side plate heat press insulation tape

The side plate heat press insulation tape is a tape with flame-retardant hot-cured epoxy adhesive coated on one side of PET film. The side plate heat press insulation film is a single-sided hot melt tape. The epoxy adhesive is a thermosetting structural adhesive with excellent flame retardancy. After hot curing, it has excellent peel strength and high temperature resistance, while also possessing good insulation performance. When hot pressed, it serves to insulate the battery from the outer shell of the battery pack. It has excellent bonding strength, high temperature resistance, and crack resistance.

The product performance of the side plate heat press insulation tape P55080BE

Items	Typical value	Unit	Test method
Color	translucent	–	Visual inspection
Type of glue	epoxy glue	–	–
Base material	Polyester film	–	–
Substrate thickness	0.05	mm	ASTM D-3652
Total thickness	0.08	mm	ASTM D-3652
Peel strength（180°）	≥1	N/mm	ASTM D-1000
water absorption	≦2.0	%	IPC-TM650
surface resistance	≥1010	Ω	IPC-TM650
Volume resistance	≥1012	Ω.Cm	IPC-TM650
PET relative dielectric constant (50HZ)	3.1	–	GB/T13541-92
Dielectric loss factor (50HZ)	2.8*10-3	–	GB/T13541-92
PET power frequency electrical strength	250	V/um	IEC 0674-3-2:1992
Thermal shrinkage	MD≤1.3 TD≤0.5	%	ASTM-D-1204
flame retardant	VTM-0	–	UL94

7、Thermal Conductive Silicone Pad

The main purpose of thermal silicone pads on batteries is to enhance heat conduction and assist in battery cooling. During operation, batteries generate heat, and if this heat is not effectively dissipated, it can affect the performance and lifespan of the battery. Thermal silicone pads can fill the gap between the battery and heat dissipation components and facilitate heat transfer from the battery to the heat sink or heat spreader. This effectively reduces the operating temperature of the battery, improving its efficiency and stability. This is particularly crucial for batteries operating in high-power and high-temperature environments as it helps reduce damage caused by overheating and prolongs battery lifespan.

Thermal pads have a certain flexibility, excellent insulation, compressibility, and natural surface adhesion. They can meet the heat transfer requirements between heating and cooling components while also providing shock absorption, insulation, and sealing. They can fulfill the design requirements for miniaturization and thinning of equipment, making them a highly versatile and practical new material. They are widely used in electronic and electrical products。

Thermal Pad P82300 Product Performance Table

Items	Unit	Testing standards	Technical indicators
Density	g.cm-3	GB/T 6343-2009	3.0±0.1
Flame retardancy	/	UL94-2013	V-0
Dielectric strength	kV/mm	ASTM D149-09	≥ 16
Volume resistivity	Ω·cm	ASTM D257- 14	≥ 1.0*1014
Thermal conductivity	W/(m·K)	ASTM D5470- 12	≥3.0
Environment protection	/	RoHS	PASS

8、Expanding tape

The expanding tape is made using modified TPU film as the substrate, coated with electrolyte-resistant pressure-sensitive adhesive. It is specifically developed for the crush test of lithium batteries, serving as a dissolution/expansion tape. It is used at the end of high-rate battery winding to replace traditional termination tapes.

The principle is as follows: After the battery cell is encased, in high-temperature and electrolyte environments, the volume of the expanding tape expands by approximately 150-200%, filling the gap between the inner cell and the outer shell. This reduces the movement of the electrolyte in vibrating environments, preventing short circuits. It has high expansion rate and adhesion and is mainly used in industries with vibration, such as electric tools.

The performance table of the expanding tape.

items	Unit	P7645	P7645T
color	–	Milk white	Milk white
Type of glue	–	Anti electrolyte pressure-sensitive adhesive	Anti electrolyte pressure-sensitive adhesive
base material	–	OPS	TPU
Total thickness	um	45±5	45±5
Peel strength（180°）	g/25mm	0.3-1.5	0.3-1.5
Tensile strength	MPa	70±10	70±10
Elongation rate	%	70-90	70-90
Environment protection	–	Pass	Pass
Volume expansion rate (85℃/4h)	%	250	250