A lithium-ion battery with measurable internal temperature and a manufacturing method thereof

Abstract

The present invention discloses a lithium-ion battery with measurable internal temperature and a manufacturing method thereof. The lithium-ion battery comprises a battery body, the battery body comprises a battery cell and a battery cell shell, the battery cell comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte filled in the battery cell, the positive electrode plate comprises a positive electrode collector, a positive electrode coating layer and a positive electrode tab; the negative electrode plate comprises a negative electrode collector, a negative electrode coating layer and a negative electrode tab; a plurality of grooves for accommodating temperature sensors are opened on the surface of the positive electrode coating layer or the negative electrode coating layer, the temperature sensors are installed in the grooves, and the temperature sensors are used to collect the internal temperature of the battery cell. The present invention provides a lithium-ion battery with measurable internal temperature and a manufacturing method thereof, which not only maintains the flatness of the electrode surface and eliminates internal safety hazards, but is also compatible with the existing soft-pack battery manufacturing process and can realize mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a lithium ion battery with measurable internal temperature and a manufacturing method thereof. Background Art

[0002] During use, lithium-ion batteries are relatively closed due to the internal isolation of the cell by an encapsulation layer. Consequently, the heat dissipation capacity of the cell is often poor, leading to significant temperature differences between the inside and outside of the battery. During thermal abuse, the temperature difference can reach as high as 600°C. Simply measuring the surface temperature of the cell cannot reflect the internal heating of the battery. To address this, several methods have been developed to measure the internal temperature of batteries, such as directly inserting temperature sensors into the cell, implanting temperature-sensitive test strips, or establishing temperature models to study the thermal behavior of different battery systems during use.

[0003] Although the above methods can monitor the internal temperature of the battery cell more accurately, the methods of implanting temperature sensors are relatively arbitrary, which will cause a series of problems and have the following disadvantages: directly placing the temperature sensor between the electrode and the diaphragm will destroy the flatness of the electrode, resulting in local lithium deposition, affecting the actual performance of the battery cell; the temperature sensor will cause greater extrusion on the local area of the diaphragm, which may easily cause the diaphragm to break and cause a short circuit inside the battery cell; the temperature sensor passes through the non-ear side of the battery cell, which will lead to incompatibility with the manufacturing process of conventional soft-pack batteries, making actual operation difficult, and the side cannot be trimmed, affecting the assembly of the battery cell. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a lithium-ion battery with measurable internal temperature and a manufacturing method thereof, which not only maintains the flatness of the electrode surface and eliminates internal safety hazards, but is also compatible with the existing soft-pack battery manufacturing process and can realize mass production.

[0005] To achieve the above-mentioned objectives, the present invention provides a lithium-ion battery with measurable internal temperature, comprising a battery body, wherein the battery body comprises a battery cell and a battery cell shell, wherein the battery cell comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte filled in the battery cell, wherein the positive electrode plate comprises a positive electrode collector, a positive electrode coating layer and a positive electrode tab; wherein the negative electrode plate comprises a negative electrode collector, a negative electrode coating layer and a negative electrode tab; wherein the surface of the positive electrode coating layer or the negative electrode coating layer is provided with a plurality of grooves for accommodating temperature sensors, wherein the temperature sensors are installed in the grooves, and wherein the temperature sensors are used to collect the internal temperature of the battery cell.

[0006] Preferably, the temperature sensor includes a temperature probe and a lead wire connected to the temperature probe, and the groove includes a first groove for accommodating the temperature probe and a second groove for accommodating the lead wire.

[0007] Preferably, the depth of the first groove is between 0.05mm and 0.4mm, and the length and width are both between 0.5mm and 2.5mm; the diameter of the lead wire is between 0.05mm and 0.3mm, and the depth of the second groove is between 0.05 and 0.4mm, and the width is between 0.05 and 2mm.

[0008] Preferably, the positive electrode coating layer is formed by coating a positive electrode active material component on one side or both sides of the positive electrode current collector; the thickness of the positive electrode coating layer is between 0.05mm and 0.4mm, and the negative electrode coating layer is formed by coating a negative electrode active material component on one side or both sides of the negative electrode current collector; the thickness of the negative electrode coating layer is between 0.05mm and 0.4mm.

[0009] Preferably, the temperature sensor is a thermistor or a thermocouple.

[0010] Preferably, the battery cell casing is an aluminum-plastic film soft package.

[0011] Preferably, the lead wire is installed between the positive electrode tab and the negative electrode tab, and the lead wire is further provided with tab glue for sealing the lead wire; the tab glue is a polypropylene material component.

[0012] The present invention also provides a method for manufacturing the above-mentioned lithium-ion battery with measurable internal temperature, comprising the following steps:

[0013] Step S1: preparing a positive electrode sheet coated with a positive electrode coating layer on one side or both sides;

[0014] Prepare a negative electrode sheet coated with a negative electrode coating layer on one side or both sides;

[0015] Step S2: determining a temperature collection location on the positive electrode sheet or the negative electrode sheet; making a groove on the positive electrode coating layer of the positive electrode sheet or the negative electrode coating layer of the negative electrode sheet;

[0016] Step S3: placing the temperature sensor inside the groove;

[0017] Step S4: performing secondary coating on the positive electrode coating layer or the negative electrode coating layer;

[0018] Step S5: Melt and bond the tab glue on the temperature sensor and the polypropylene layer inside the aluminum-plastic film of the battery shell together to achieve battery sealing.

[0019] Preferably, the thickness of the positive electrode coating layer in step S1 is between 0.05 mm and 0.4 mm, and the thickness of the negative electrode coating layer is between 0.05 mm and 0.4 mm;

[0020] The groove in step S2 is formed by removing the positive electrode coating layer or the negative electrode coating layer by a high-energy pulse laser; the groove includes a first groove and a second groove, the depth of the first groove is between 0.05mm and 0.4mm, and the length and width are between 0.5mm and 2.5mm; the depth of the second groove is between 0.05 and 0.4mm, and the width is between 0.05 and 2mm.

[0021] Preferably, the heat sealing in step S5 is completed by heating the special-shaped head and pressurizing the tab glue and the aluminum-plastic film through the special-shaped head; the special-shaped head is provided with a third groove between the packaging grooves of the positive pole tab and the negative pole tab, and the heating temperature of the special-shaped head is between 170°C and 200°C.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a plurality of grooves for accommodating temperature sensors on the surface of the positive electrode coating layer or the negative electrode coating layer, and installs the temperature sensors inside the grooves. After the temperature sensors are implanted, the flatness of the electrode surface is maintained well, which has a positive effect on the performance of the lithium battery. At the same time, installing the temperature sensors in the grooves can eliminate the hidden danger of internal short circuit caused by the compression of the diaphragm.

[0024] 2. The lead wire of the present invention is installed between the positive electrode tab and the negative electrode tab. On the one hand, it is compatible with the existing soft-pack battery manufacturing process and can achieve mass production; on the other hand, the tab glue installed on the lead wire and the polypropylene layer inside the aluminum-plastic film can be melted by heating, thereby achieving battery sealing.

[0025] 3. The grooves described in the present invention are formed by removing the positive electrode coating layer or the negative electrode coating layer by a high-energy pulse laser, and after placing the temperature sensor, a secondary coating is performed on the surface of the positive electrode coating layer or the negative electrode coating layer, which can further ensure the flatness of the electrode surface.

[0026] 4. The sealing described in the present invention is achieved by heating and pressurizing the special-shaped head. The special-shaped head is provided with a third groove between the packaging grooves of the positive electrode tab and the negative electrode tab. The third groove corresponds to the tab glue on the lead-out wire. The third groove can melt the tab glue and seal the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a front view of a lithium-ion battery with measurable internal temperature provided by the present invention;

[0029] Figure 2 This is an exploded view of a lithium-ion battery with measurable internal temperature provided by the present invention. The figure includes:

[0030] 13-battery body, 1-positive electrode sheet, 2-negative electrode sheet, 3-positive electrode current collector, 12-positive electrode coating layer, 10-positive electrode tab, 4-negative electrode current collector, 11-negative electrode coating layer, 9-negative electrode tab, 14-temperature sensor, 6-groove, 5-temperature probe, 7-lead wire, 61-first groove, 62-second groove, 8-ear glue. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solution in this embodiment of the present invention in conjunction with the drawings in this embodiment of the present invention. Obviously, the embodiment described is only one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1

[0033] Please refer to Figure 1 and Figure 2, Embodiment 1 of the present invention provides a lithium-ion battery with measurable internal temperature, including a battery body 13, the battery body 13 including a battery cell and a battery cell shell, the battery cell including a positive electrode sheet 1, a negative electrode sheet 2, a separator and an electrolyte filled in the battery cell, the positive electrode sheet 1 including a positive electrode collector 3, a positive electrode coating layer 12 and a positive electrode tab; the negative electrode sheet 2 including a negative electrode collector 4, a negative electrode coating layer 11 and a negative electrode tab; a plurality of grooves 6 for accommodating temperature sensors 14 are formed on the surface of the positive electrode coating layer 12 or the negative electrode coating layer 11, the temperature sensors 14 are installed in the grooves 6, and the temperature sensors 14 are used to collect the internal temperature of the battery cell; installing the temperature sensors 14 in the grooves 6 can ensure that after the temperature sensors 14 are implanted, the flatness of the surfaces of the positive electrode sheet 1, the negative electrode sheet 2 and the separator is maintained well, which has a positive effect on the performance of the lithium battery. At the same time, installing the temperature sensors 14 in the grooves 6 can eliminate the hidden danger of internal short circuit caused by the temperature sensors 14 squeezing the separator.

[0034] Specifically, the temperature sensor 14 is located between the diaphragm and the positive electrode current collector 3 or between the diaphragm and the negative electrode current collector 4. Since the number of the temperature sensors 14 can be multiple, the temperature sensors 14 can be placed separately inside the positive electrode coating layer 12 and the negative electrode coating layer 11. Furthermore, several temperature sensors 14 can be simultaneously located at different positions between the same diaphragm and the positive electrode current collector 3 or between the same diaphragm and the negative electrode current collector 4.

[0035] Furthermore, the formation of the groove 6 includes two major methods, one of which is: prefabrication type; specifically, placing a template of the groove 6 on the positive electrode collector 3 or the negative electrode collector 4, and then coating the positive electrode active material component on one side or both sides of the positive electrode collector 3, wherein the inside of the groove 6 is not coated, or coating the negative electrode active material component on one side or both sides of the negative electrode collector 4, wherein the inside of the groove 6 is not coated, and finally, taking out the template of the groove 6, a groove 6 is formed inside the positive electrode coating layer 12 and the negative electrode coating layer 11; the other is: removal type; specifically, by a removal method, the positive electrode coating layer 12 on the positive electrode collector 3 or the negative electrode coating layer 11 on the negative electrode collector 4 is removed to form the groove 6. In this embodiment, a high-energy pulse laser cleaning method is adopted.

[0036] like Figure 2As shown, the temperature sensor 14 includes a temperature probe 5 and a lead wire 7 connected to the temperature probe 5, and the groove 6 includes a first groove 61 for placing the temperature probe 5 and a second groove 62 for placing the lead wire 7. In this embodiment, the shapes of the first groove 61 and the second groove 62 are both rectangular. In other embodiments, the shapes of the first groove 61 and the second groove 62 can also be other shapes that are suitable for the temperature sensor 14, which is not limited in this patent.

[0037] Furthermore, the depth of the first groove 61 is between 0.05mm and 0.4mm, and the length and width are both between 0.5mm and 2.5mm; the diameter of the lead wire 7 is between 0.05mm and 0.3mm, and the depth of the second groove 62 is between 0.05 and 0.4mm, and the width is between 0.05 and 2mm.

[0038] like Figure 2 As shown, the positive electrode coating layer 12 is formed by coating a positive electrode active material component on one side or both sides of the positive electrode current collector 3; the thickness of the positive electrode coating layer 12 is between 0.05 mm and 0.4 mm, and the negative electrode coating layer 11 is formed by coating a negative electrode active material component on one side or both sides of the negative electrode current collector 4; the thickness of the negative electrode coating layer 11 is between 0.05 mm and 0.4 mm. Furthermore, the thickness of the positive electrode coating layer 12 and the thickness of the negative electrode coating layer 11 should both be greater than the depth of the first groove 61 and the depth of the second groove 62, so as to ensure that the first groove 61 and the second groove 62 will not damage the positive electrode current collector 3 or the negative electrode current collector 4, thereby ensuring the integrity of the positive electrode plate 1 or the negative electrode plate 2.

[0039] In this embodiment, the temperature sensor 14 is a thermocouple; in other embodiments, the temperature sensor 14 may also be a thermistor or other sensors that can measure temperature.

[0040] In this embodiment, the battery cell casing is an aluminum-plastic film soft package.

[0041] like Figure 1 As shown, the lead wire 7 is installed between the positive electrode tab 10 and the negative electrode tab 9, and the lead wire 7 is also provided with a tab glue 8 for sealing the lead wire 7; the above structure can be compatible with the existing soft-pack battery manufacturing process on the one hand, and can achieve mass production; on the other hand, the tab glue 8 installed on the lead wire 7 and the polypropylene layer inside the aluminum-plastic film can be melted by heating, thereby achieving sealing of the battery.

[0042] In this embodiment, in order to prevent electrolyte leakage, the tab glue 8 is made of polypropylene material.

[0043] Example 2

[0044] A second embodiment of the present invention provides a method for manufacturing a lithium-ion battery with measurable internal temperature as described in the first embodiment, comprising the following steps:

[0045] Step S1: preparing a positive electrode plate 1 coated with a positive electrode coating layer 12 on one side or both sides; preparing a negative electrode plate 2 coated with a negative electrode coating layer 11 on one side or both sides.

[0046] Specifically, the thickness of the positive electrode coating layer 12 in step S1 is between 0.05 mm and 0.4 mm, and the thickness of the negative electrode coating layer 11 is between 0.05 mm and 0.4 mm; the positive electrode coating layer 12 is formed by coating a positive electrode active material component on one side or both sides of the positive electrode current collector 3; the negative electrode coating layer 11 is formed by coating a negative electrode active material component on one side or both sides of the negative electrode current collector 4.

[0047] Step S2: Determine a temperature collection location on the positive electrode sheet 1 or the negative electrode sheet 2; the temperature collection location may be more than one, and may be multiple; lines may also be drawn on the positive electrode coating layer 12 or the negative electrode coating layer 11 to mark the location of the groove 6; a groove 6 is made on the positive electrode coating layer 12 of the positive electrode sheet 1 or the negative electrode coating layer 11 of the negative electrode sheet 2; the method for forming the groove 6 is the same as that in Example 1.

[0048] Specifically, the groove 6 in step S2 is formed by removing the positive electrode coating layer 12 or the negative electrode coating layer 11 by a high-energy pulse laser; the groove 6 includes a first groove 61 and a second groove 62, the depth of the first groove 61 is between 0.05mm and 0.4mm, and the length and width are between 0.5mm and 2.5mm; the depth of the second groove 62 is between 0.05 and 0.4mm, and the width is between 0.05 and 2mm.

[0049] Step S3 : placing the temperature sensor 14 inside the groove 6 .

[0050] Step S4: performing secondary coating on the positive electrode coating layer 12 or the negative electrode coating layer 11; this can further ensure the flatness of the electrode surface.

[0051] Step S5: The tab glue 8 on the temperature sensor 14 and the polypropylene layer inside the aluminum-plastic film of the battery shell are melted and bonded together to achieve battery sealing.

[0052] Specifically, the heat sealing in step S5 is completed by heating the special-shaped head and pressurizing the tab glue 8 and the aluminum-plastic film through the special-shaped head; the special-shaped head is provided with a third groove between the packaging groove of the positive tab 10 and the negative tab 9, and the third groove corresponds to the tab glue 8 on the lead-out wire 7. The third groove can melt the tab glue 8 and seal the temperature sensor 14; the heating temperature of the special-shaped head is between 170°C and 200°C.

[0053] Example 3

[0054] Please refer to Figure 1 and Figure 2 , this embodiment three provides a lithium-ion battery with measurable internal temperature, including a positive electrode plate 1, a negative electrode plate 2, a separator, an electrolyte, a negative electrode tab 9, a positive electrode tab 10, an aluminum-plastic film and a temperature sensor 14, wherein the temperature sensor 14 includes a temperature probe 5, a lead wire 7 connected to the temperature probe 5 and a tab glue 8 mounted on the lead wire 7.

[0055] The coating material of the negative electrode coating layer 11 is artificial graphite, and the thickness of a single surface is 0.075 mm. The coating material of the positive electrode coating layer 12 is lithium manganese oxide, and the thickness of a single surface is 0.12 mm.

[0056] The groove 6 is formed by removing the positive electrode coating layer 12 using a high-energy pulse laser. The depth of the first groove 61 is 0.11 mm, the width is 0.8 mm, and the length of the second groove 62 is 30 mm.

[0057] The diameter of each lead wire 7 is 0.06 mm. Generally, there are two lead wires 7 . There are also three lead wires.

[0058] The tab glue 8 has a thickness of 0.2 mm, a width of 5 mm, and a length of 9 mm. The tab glue 8 is made of polypropylene.

[0059] The temperature sensor 14 is embedded in the groove 6 , and the groove 6 is filled with the same lithium manganate slurry, and then placed in a 120° C. oven and baked for 2 hours to fix the temperature sensor 14 .

[0060] The special-shaped head is provided with a third groove between the packaging grooves of the positive electrode tab 10 and the negative electrode tab 9, and the third groove is an arc groove; the depth of the arc groove is 0.12 mm, and the arc groove is located at the center of the packaging grooves of the positive electrode tab 10 and the negative electrode tab 9; the special-shaped head is heated to 195°C, and the battery cell is positioned between the upper head and the lower head by a clamp. After waiting for 5 seconds, the tab glue 8 and the polypropylene layer melt and bond together to achieve battery sealing.

[0061] Example 4

[0062] Please refer to Figure 1 and Figure 2 The fourth embodiment provides a lithium-ion battery with measurable internal temperature, including a positive electrode sheet 1, a negative electrode sheet 2, a separator, an electrolyte, a negative electrode tab 9, a positive electrode tab 10, an aluminum-plastic film, and a temperature sensor 14. The temperature sensor 14 includes a temperature probe 5, a lead wire 7 connected to the temperature probe 5, and a tab glue 8 mounted on the lead wire 7.

[0063] The negative electrode coating layer 11 is coated with lithium titanate, and the thickness of a single surface is 0.14 mm. The positive electrode coating layer 12 is coated with lithium nickel cobalt manganese oxide, and the thickness of a single surface is 0.06 mm.

[0064] The groove 6 is formed by removing the negative electrode coating layer 11 using a high-energy pulse laser. The depth of the first groove 61 is 0.12 mm, the width is 1.0 mm, and the length of the second groove 62 is 40 mm.

[0065] The diameter of each lead wire 7 is 0.06 mm. Generally, there are two lead wires 7 . There are also three lead wires.

[0066] The tab glue 8 has a thickness of 0.2 mm, a width of 5 mm, and a length of 9 mm. The tab glue 8 is made of polypropylene.

[0067] The temperature sensor 14 is embedded in the groove 6 , and the groove 6 is filled with the same lithium titanate slurry, and then placed in a 105° C. oven and baked for 2 hours to fix the temperature sensor 14 .

[0068] The special-shaped head is provided with a third groove between the packaging grooves of the positive electrode tab 10 and the negative electrode tab 9, and the third groove is an arc groove; the depth of the arc groove is 0.12 mm, and the arc groove is located at the center of the packaging grooves of the positive electrode tab 10 and the negative electrode tab 9; the special-shaped head is heated to 195°C, and the battery cell is positioned between the upper head and the lower head by a clamp. After waiting for 5 seconds, the tab glue 8 and the polypropylene layer melt and bond together to achieve battery sealing.

[0069] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a lithium-ion battery with measurable internal temperature, characterized in that: The invention comprises a battery body (13), wherein the battery body (13) comprises a battery cell and a battery cell shell, wherein the battery cell comprises a positive electrode sheet (1), a negative electrode sheet (2), a separator and an electrolyte filled in the battery cell, wherein the positive electrode sheet (1) comprises a positive electrode current collector (3), a positive electrode coating layer (12) and a positive electrode tab; wherein the negative electrode sheet (2) comprises a negative electrode current collector (4), a negative electrode coating layer (11) and a negative electrode tab; wherein a plurality of grooves (6) for accommodating temperature sensors (14) are provided on the surface of the positive electrode coating layer (12) or the negative electrode coating layer (11), wherein the temperature sensors (14) are installed in the grooves (6), and wherein the temperature sensors (14) are used to collect the internal temperature of the battery cell; The following steps are also included: Step S1: preparing a positive electrode sheet (1) coated with a positive electrode coating layer (12) on one side or both sides; preparing a negative electrode sheet (2) coated with a negative electrode coating layer (11) on one side or both sides; Step S2: determining a temperature collection location on the positive electrode sheet (1) or the negative electrode sheet (2); making a groove (6) on the positive electrode coating layer (12) of the positive electrode sheet (1) or the negative electrode coating layer (11) of the negative electrode sheet (2); Step S3: placing the temperature sensor (14) inside the groove (6); Step S4: performing secondary coating on the positive electrode coating layer (12) or the negative electrode coating layer (11); Step S5: melting and bonding the tab glue (8) on the temperature sensor (14) and the polypropylene layer inside the aluminum-plastic film of the battery shell together to achieve battery sealing; The heat sealing in step S5 is completed by heating the special-shaped head and applying pressure between the tab glue (8) and the aluminum-plastic film through the special-shaped head; the special-shaped head is provided with a third groove between the packaging grooves of the positive tab (10) and the negative tab (9), and the heating temperature of the special-shaped head is between 170°C and 200°C.

2. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 1, characterized in that: The temperature sensor (14) includes a temperature probe (5) and a lead wire (7) connected to the temperature probe (5), and the groove (6) includes a first groove (61) for accommodating the temperature probe (5) and a second groove (62) for accommodating the lead wire (7).

3. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 2, characterized in that: The depth of the first groove (61) is between 0.05 mm and 0.4 mm, and the length and width are both between 0.5 mm and 2.5 mm; the diameter of the lead wire (7) is between 0.05 mm and 0.3 mm; the depth of the second groove (62) is between 0.05 mm and 0.4 mm, and the width is between 0.05 mm and 2 mm.

4. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 1, wherein: The positive electrode coating layer (12) is formed by coating a positive electrode active material component on one side or both sides of a positive electrode current collector (3); the thickness of the positive electrode coating layer (12) is between 0.05 mm and 0.4 mm. The negative electrode coating layer (11) is formed by coating a negative electrode active material component on one side or both sides of a negative electrode current collector (4); the thickness of the negative electrode coating layer (11) is between 0.05 mm and 0.4 mm.

5. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 1, wherein: The temperature sensor (14) is a thermistor or a thermocouple.

6. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 2, characterized in that: The lead wire (7) is installed between the positive electrode tab (10) and the negative electrode tab (9), and the lead wire (7) is further provided with tab glue (8) for sealing the lead wire (7); the tab glue (8) is a polypropylene material component.

7. The method for manufacturing a lithium-ion battery with measurable internal temperature according to claim 1, characterized in that: In step S1, the thickness of the positive electrode coating layer (12) is between 0.05 mm and 0.4 mm, and the thickness of the negative electrode coating layer (11) is between 0.05 mm and 0.4 mm; The groove (6) in step S2 is formed by removing the positive electrode coating layer (12) or the negative electrode coating layer (11) by high-energy pulse laser; the groove (6) includes a first groove (61) and a second groove (62), the first groove (61) has a depth between 0.05 mm and 0.4 mm, and a length and width between 0.5 mm and 2.5 mm; the second groove (62) has a depth between 0.05 mm and 0.4 mm, and a width between 0.05 mm and 2 mm.

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