Temperature sensor, secondary battery including same, and method of manufacturing secondary battery

Abstract

A secondary battery according to the present invention comprises: an electrode assembly; a pouch in which the electrode assembly is accommodated; an electrode lead coupled to an electrode tab provided in the electrode assembly, a leading end of the electrode lead being drawn out from the pouch, and the electrode lead having an insertion hole formed to extend from an inside to an outside of the pouch; and a temperature sensor inserted into the insertion hole and provided to include a temperature measuring unit having a thermistor chip positioned inside the pouch to measure an internal temperature of the pouch, and a connector positioned outside the pouch.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2022-0088571, filed on Jul. 18, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0004] The present invention relates to a temperature sensor, a secondary battery including the temperature sensor, and a method for manufacturing the secondary battery. In particular, the present invention relates to a temperature sensor capable of measuring the internal temperature of a bag, a secondary battery including the temperature sensor, and a method for manufacturing the secondary battery. Background Art

[0005] Generally speaking, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Such secondary batteries are widely used in high-tech electronic devices such as phones, laptops, and camcorders.

[0006] Secondary batteries are divided into can-type secondary batteries in which the electrode assembly is embedded in a metal can and pouch-type secondary batteries in which the electrode assembly is embedded in a bag. The can-type secondary battery includes an electrode assembly, a can that accommodates the electrode assembly, and a cap assembly installed in the opening of the can. The pouch-type secondary battery includes an electrode assembly and a bag that accommodates the electrode assembly. The electrode assembly is divided into a roll-type (wound type) electrode assembly, a stacked type electrode assembly, and a stacked / folded type electrode assembly.

[0007] The pouch type secondary battery uses a method for measuring the temperature of the outside of the pouch when measuring the temperature.

[0008] However, in a pouch-type secondary battery, there is a temperature difference between the inside of the pouch and the outside of the pouch, and thus there is a limitation in that it is difficult to accurately measure the temperature without measuring the internal temperature of the pouch. Summary of the invention

[0009] Technical issues

[0010] An object of the present invention is to provide a temperature sensor capable of accurately measuring the internal temperature of a bag, a secondary battery including the temperature sensor, and a method for manufacturing the secondary battery.

[0011] Technical Solution

[0012] A secondary battery of the present invention may include: an electrode assembly; a bag configured to accommodate the electrode assembly; an electrode lead connected to an electrode tab provided on the electrode assembly, a front end of the electrode lead being drawn out of the bag, and an insertion hole extending from the inside of the bag to the outside thereof being defined in the electrode lead; and a temperature sensor inserted into the insertion hole, wherein the temperature sensor includes a temperature measuring portion provided inside the bag to measure the internal temperature of the bag and a connector provided outside the bag.

[0013] The temperature sensor may be provided to have a thickness less than or equal to a thickness of the electrode lead defining the insertion hole.

[0014] The temperature measuring part may be coated with an anti-oxidation protective layer.

[0015] The anti-oxidation protective layer may be provided as a polymer coating, and the polymer coating may be made of a polyparaxylene material.

[0016] A lead film is provided on the electrode lead provided on the sealing part of the bag, the temperature sensor can be provided with a connecting part which is provided between the temperature measuring part and the connector and contacts the lead film, and the connecting part can be provided with a reinforcing layer which increases the adhesion to the lead film.

[0017] The reinforcement layer may be made of a metal material plated on the connection portion.

[0018] The secondary battery may further include a sealing material disposed between the temperature sensor and an inner wall of the insertion hole to seal a gap between the temperature sensor and the inner wall of the insertion hole.

[0019] The sealing material may be made of the same material as the lead film.

[0020] A method for manufacturing a secondary battery of the present invention may include the following steps: step (a), in which a temperature sensor is prepared; step (b), in which a surface of one side of an electrode lead is cut to process an insertion hole; step (c), in which a rear end of the electrode lead is connected to an electrode connector of an electrode assembly and the temperature sensor is inserted into the insertion hole of the electrode lead; and step (d), in which the electrode assembly is housed in a bag, wherein a temperature measuring portion of the temperature sensor is arranged inside the bag, and a connector of the temperature sensor is arranged outside the bag.

[0021] In the step (b), the temperature sensor may be provided to have a thickness less than or equal to a thickness of the electrode lead defining the insertion hole.

[0022] The step (a) may further include a step of coating an anti-oxidation protective layer on the surface of the temperature measuring part, wherein the anti-oxidation protective layer may be formed by depositing a polyparaxylene coating on the temperature measuring part.

[0023] Step (a) may further include: forming a reinforcing layer for increasing adhesion to a connection portion provided between the temperature measurement device and the connector, wherein the reinforcing layer may be made of a metal material and formed by plating on a surface of the connection portion.

[0024] Step (c) may further include: after inserting the temperature sensor into the electrode lead insertion hole, inserting a sealing material into a gap between an inner wall of the insertion hole and the temperature sensor to seal the gap.

[0025] The method may further include, after step (d), a step (e) of setting a lead film surrounding the electrode lead to pass between the temperature measuring part and the connector; and a step of sealing a portion of the sealing part of the bag, injecting an electrolyte into the non-sealed part of the bag to impregnate the electrode assembly, and sealing the non-sealed part of the bag to manufacture a secondary battery.

[0026] The temperature sensor of the present invention includes: a temperature measuring part having a thermistor arranged on one end thereof to measure temperature; a connector arranged on the other end thereof; and a connecting part configured to connect the temperature measuring part to the connector, wherein the connecting part may be provided with a reinforcing layer for increasing adhesion.

[0027] Technical Effects

[0028] The secondary battery of the present invention may include a temperature sensor for measuring the internal temperature of the bag, and the temperature sensor may be arranged to be inserted into an insertion hole defined in the electrode lead. Due to these features, the thickness increase of the sealing portion of the bag in which the electrode lead is arranged can be minimized, and in particular, the temperature sensor can be fixed more stably.

[0029] In addition, in the secondary battery of the present invention, the temperature sensor may be provided at a temperature lower than or equal to the temperature of the electrode lead defining the insertion hole. Due to this feature, the thickness of the sealing portion of the pouch may be prevented from increasing.

[0030] In addition, in the secondary battery of the present invention, an anti-oxidation protective layer can be applied to the temperature measuring part of the temperature sensor, and the anti-oxidation protective layer can be made of polyparaxylene material. Due to this feature, the temperature measuring part can be greatly prevented from being oxidized by the electrolyte.

[0031] In addition, in the temperature sensor in the secondary battery of the present invention, the connection part can be provided between the temperature measuring part and the connector, and the connection part can be plated with a reinforcing layer made of a metal material to improve the adhesion to the lead film. Due to these features, the sealing force between the temperature sensor and the lead film can be increased.

[0032] In addition, in the secondary battery of the present invention, the sealing material may be provided between the temperature sensor and the inner wall of the insertion hole of the electrode lead. Due to this feature, the portion between the temperature sensor and the inner wall of the insertion hole can be stably sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a perspective view of a secondary battery according to a first embodiment of the present invention.

[0034] Figure 2 yes Figure 1 Floor plan.

[0035] Figure 3 yes Figure 1 Left view of .

[0036] Figure 4 is a perspective view illustrating a temperature sensor and an electrode lead of a secondary battery according to a first embodiment of the present invention.

[0037] Figure 5 It is an example Figure 4 A plan view of the temperature sensor is shown.

[0038] Figure 6 is along Figure 4 The cross-sectional view of line AA extraction.

[0039] Figure 7 is a plan view illustrating a state in which a temperature sensor and an electrode lead are coupled to each other in the present invention.

[0040] Figure 8 is a flowchart illustrating a method for manufacturing a secondary battery according to a first embodiment of the present invention.

[0041] Fig. 9 is a perspective view of a temperature sensor according to a second embodiment of the present invention.

[0042] Fig.10 yes Fig. 9 Floor plan. DETAILED DESCRIPTION

[0043] Below, the embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person skilled in the art can easily implement the technical concept of the present invention. However, the present invention can be implemented in different forms and should not be construed as being limited to the embodiments described herein. In the accompanying drawings, any content that is not necessary for describing the present invention will be omitted for clarity, and similar reference numerals in the accompanying drawings also refer to similar elements.

[0044] [Secondary battery according to first embodiment of the present invention]

[0045] Figure 1 is a perspective view of a secondary battery according to a first embodiment of the present invention, Figure 2 yes Figure 1 The floor plan of Figure 3 yes Figure 1 Left view of .

[0046] like Figures 1 to 3 As shown, the secondary battery 1 according to the first embodiment of the present invention has a structure including a temperature sensor 15 for measuring the internal temperature of the pouch 12 .

[0047] That is, the secondary battery 1 according to the first embodiment of the present invention includes: the electrode assembly 11, the pouch 12 accommodating the electrode assembly 11, the electrode lead 13 coupled to the electrode assembly 11, the lead film 14 provided on the electrode lead 13, and the temperature sensor 15 measuring the internal temperature of the pouch 12.

[0048] Electrode assembly

[0049] The electrode assembly 11 has a structure in which separators and electrodes are alternately stacked, and each electrode includes an electrode tap 111 .

[0050] The electrodes include a positive electrode and a negative electrode, and the electrode tab 111 includes a positive electrode tab disposed on the positive electrode and a negative electrode tab disposed on the negative electrode.

[0051] bag

[0052] The pouch 12 includes a receiving portion 121 receiving the electrode assembly 11 and a sealing portion 122 provided along an edge surface of the receiving portion 121 to seal the receiving portion 121 .

[0053] Electrode lead

[0054] The electrode lead 13 has a long rectangular plate shape and has the following structure: the rear end ( Figure 2 The end portion facing the electrode assembly in the bag 11 is connected to the electrode tab 111, and the front end is drawn out of the bag 12.

[0055] Figure 4is a perspective view illustrating a temperature sensor and an electrode lead of a secondary battery according to a first embodiment of the present invention.

[0056] Specifically, see Figure 4 , the electrode lead 13 is provided with an insertion hole 131 extending from the inside to the outside of the bag 12, and referring to Figure 4 , the insertion hole 131 is in the vertical direction (when Figure 4 That is, the insertion hole 131 is configured to be elongated in the entire length direction of the electrode lead 13.

[0057] The temperature sensor 15 is inserted into the insertion hole 131 .

[0058] Lead film

[0059] The lead film 14 is configured to increase the sealing force between the seal portion 122 of the bag 12 and the electrode lead 13. That is, the lead film 14 is provided in a shape surrounding the peripheral surface of the electrode lead 13 provided on the seal portion 122 of the bag 12.

[0060] Figure 5 It is an example Figure 4 The temperature sensor 15 is shown in plan view, and Figure 6 is along Figure 4 The cross-sectional view of line AA extraction.

[0061] Temperature Sensor

[0062] The temperature sensor 15 has a structure to be inserted into the insertion hole 131, such as Figure 5 and 6 shown.

[0063] Specifically, the temperature sensor 15 includes a temperature measuring portion 151 having a thermistor chip 1511 disposed inside the bag 12 to measure the internal temperature of the bag 12 , and a connector 152 having a terminal 1521 disposed outside the bag 12 .

[0064] Here, the connector 152 includes a terminal 1521 connected to a temperature measuring device (not shown), and the temperature measuring device compares the internal temperature of the bag 12 received from the connector 152 with the set temperature in real time. Specifically, the temperature measuring device displays the internal temperature of the bag 12 received from the connector 152 on an external display window in real time.

[0065] That is, the temperature sensor 15 measures the internal temperature of the bag 12 through the thermistor chip 1511 of the temperature measuring part 151 , and the connector 152 transmits the measured temperature measured by the thermistor chip 1511 to the temperature measuring device to check and display the internal temperature of the bag 12 .

[0066] As described above, the temperature sensor 15 can be inserted into the insertion hole 131 defined in the electrode lead 13 to increase the fixing force of the temperature sensor 15, and also accurately measure the internal temperature of the bag 12 and quickly transmit the measured internal temperature to the outside. Specifically, the temperature sensor 15 can prevent the sealing force between the sealing portion 122 of the bag 12 and the lead film 14 from deteriorating by minimizing the increase in the thickness of the electrode lead 13.

[0067] The temperature sensor 15 may be provided with a thickness less than or equal to the thickness of the electrode lead 13 in which the insertion hole 131 is defined. Preferably, the temperature sensor 15 may be provided with the same thickness as the electrode lead 13. Therefore, the height difference occurring between the temperature sensor 15 and the electrode lead 13 may be minimized, and thus, the adhesive force and attachment between the temperature sensor 15 and the lead film 14 may be increased.

[0068] Since the temperature measuring part 151 is disposed inside the bag 12, oxidation may occur due to the electrolyte. To prevent oxidation, an anti-oxidation protective layer 154 may be coated on the surface of the temperature measuring part 151 to prevent the temperature measuring part 151 from being oxidized by the electrolyte.

[0069] Here, the anti-oxidation protection layer 154 may be provided as a polymer coating. In more detail, the protection layer 154 for preventing oxidation may be made of a polyparaxylene material.

[0070] Here, the polyparaxylene coating refers to a polymer coating that is deposited on an object in a vacuum state in a micro-thickness unit in the form of gas regardless of its shape. The polyparaxylene coating can be used in areas that require LED surface protection, PCB surface protection, corrosion resistance, chemical resistance, chemical resistance, lubricity, etc.

[0071] The temperature sensor 15 is disposed between the temperature measuring part 151 and the connector 152, and is provided with a connection part 153 contacting the lead film 14. Here, the connection part 153 may be provided with a reinforcement layer 155 to increase adhesion to the lead film 14.

[0072] The reinforcement layer 155 may be made of a metal material plated on the surface of the connection part 153, and the metal material may be gold or nickel (Ni). Therefore, the reinforcement layer 155 may be plated on the surface of the connection part 153 to increase the adhesive force and sealing force between the connection part 153 and the lead film 14.

[0073] Figure 7 is a plan view illustrating a state in which a temperature sensor and an electrode lead are coupled to each other in the present invention.

[0074] A sealing material 156 may also be provided, which is provided between the temperature sensor 15 and the inner wall of the insertion hole 131 to seal the gap between the temperature sensor 15 and the inner wall of the insertion hole 131. Figure 7 As shown, the sealing material 156 is used to close the gap between the temperature sensor 15 and the insertion hole 131. Therefore, the gap between the insertion hole 131 and the temperature sensor 15 can be stably sealed.

[0075] The sealing material 156 may be made of the same material as the lead film 14. Preferably, the sealing material 156 may be polypropylene.

[0076] The temperature sensor 15 having the above-described structure may be stably fixed to the secondary battery by being inserted into the insertion hole 131 defined in the electrode lead 13 , and may accurately measure the internal temperature of the pouch 12 .

[0077] Therefore, the secondary battery 1 according to the first embodiment of the present invention can accurately measure the internal temperature of the pouch 12 by including the temperature sensor 15 that measures the internal temperature of the pouch 12 .

[0078] Hereinafter, a method for manufacturing the secondary battery 1 according to the first embodiment of the present invention will be described.

[0079] Figure 8 is a flowchart illustrating a method for manufacturing a secondary battery according to a first embodiment of the present invention.

[0080] like Figure 8 As shown, the method for manufacturing a secondary battery according to the first embodiment of the present invention includes: a process (a) of preparing a temperature sensor 15, a process (b) of processing an electrode lead 13, a process (c) of inserting the temperature sensor 15 into the electrode lead 13, a process (d) of setting the electrode assembly 11 with the inserted temperature sensor 15 in a bag 12, a process (e) of setting a lead film 14, and a process (f) of sealing the bag 12.

[0081] In step (a), the temperature sensor 15 is prepared. The temperature sensor 15 includes: a temperature measuring portion 151 having a thermistor chip 1511 for measuring temperature; a connector 152 through which the temperature of the temperature measuring portion 151 is transmitted; and a connecting portion 153 that connects the temperature measuring portion 151 to the connector 152.

[0082] Step (a) may further include: coating an anti-oxidation protective layer 154 on the surface of the temperature measuring part 151 to prevent the temperature measuring part 151 from being oxidized by the electrolyte. That is, the anti-oxidation protective layer 154 is formed by depositing a polyparaxylene coating on the temperature measuring part 151 .

[0083] Step (a) may further include forming a reinforcing layer 155 on the surface of the connection portion 153 to increase the adhesive force between the connection portion 153 and the lead film 14. That is, the reinforcing layer 155 is made of a metal material and is formed on the surface of the connection portion 153 by plating.

[0084] The metal material may be nickel (Ni) or gold.

[0085] In process (b), the insertion hole 131 is processed by cutting or punching one side surface of the bag 12. Here, the insertion hole 131 has a length such that one end thereof is disposed inside the bag 12 and the other end thereof is disposed outside the bag 12. In addition, the insertion hole 131 may have a width corresponding to the length of the temperature sensor 15 in the full width direction to minimize the gap between the insertion hole 131 and the temperature sensor 15 and prevent the temperature sensor 15 from moving inside the insertion hole 131.

[0086] In addition, in the process (b), the temperature sensor 15 may be provided with a thickness less than or equal to the thickness of the electrode lead 13 defining the insertion hole 131. Preferably, the temperature sensor 15 may be provided with the same thickness as the electrode lead 13. Therefore, a height difference between the temperature sensor 15 and the electrode lead 13 may be prevented, and as a result, the bonding and sealing force between the temperature sensor 15 and the lead film 14 may be increased.

[0087] In process (c), the rear end of the electrode lead 13 is coupled to the electrode tab 111 provided on the electrode assembly 11, and the temperature sensor 15 is installed in the insertion hole 131 of the electrode lead 13. Here, the temperature measuring portion 151 of the temperature sensor 15 is provided inside the bag 12, and the connector 152 of the temperature sensor 15 is inserted to be provided outside the bag 12.

[0088] Step (c) also includes a step of inserting a sealing material 156 into a gap between the inner wall of the insertion hole 131 and the temperature sensor to seal the gap after the temperature sensor 15 is inserted into the insertion hole 131 of the electrode lead 13. Therefore, the gap between the insertion hole 131 and the temperature sensor 15 can be stably sealed. Here, the sealing material 156 can be made of the same material as the lead film 14. Therefore, the adhesive force between the sealing material 156 and the lead film 14 can be increased.

[0089] In step (d), the electrode assembly 11 is housed in the bag 12 , the temperature measuring portion 151 of the temperature sensor 15 is disposed inside the bag 12 , and the connector 152 of the temperature sensor 15 is disposed outside the bag 12 .

[0090] In process (e), the lead film 14 surrounding the electrode lead 13 is coupled to pass between the temperature measuring part 151 and the connector 152 .

[0091] In step (f), a portion of the sealed portion 122 of the bag 12 is sealed, and then the electrolyte is injected into the non-sealed portion of the bag 12 to impregnate the electrode assembly 11 , thereby sealing the non-sealed portion of the bag 12 .

[0092] When the above processes are completed, a finished secondary battery 1 can be manufactured.

[0093] Hereinafter, in description of another embodiment of the present invention, components having the same functions as those of the above-described embodiment are given the same reference numerals in the drawings, and thus repeated description will be omitted.

[0094] [Temperature sensor according to the second embodiment of the present invention]

[0095] Fig. 9 is a perspective view of a temperature sensor according to a second embodiment of the present invention, and Fig.10 yes Fig. 9 Floor plan.

[0096] The temperature sensor 15 according to the second embodiment of the present invention is manufactured by commercializing only the temperature sensor 15 separately from the secondary battery 1 according to the above-described first embodiment.

[0097] That is to say, Fig. 9 and Fig.10 As shown, the temperature sensor 15 according to the second embodiment of the present invention includes a thermistor chip 1511 provided at one end thereof to measure temperature, a connector 152 provided at the other end thereof, and a connecting portion 153 connecting the temperature measuring portion 151 to the connector 152 .

[0098] Here, the connection part 153 may be provided with a reinforcement layer 155 to increase adhesive force, and the reinforcement layer 155 may be made of a metal material plated on the connection part 153. Since the reinforcement layer 155 has been described in detail in the first embodiment, a detailed description thereof is omitted.

[0099] The temperature measuring part 151 may be coated with an anti-oxidation protection layer 154. Since the anti-oxidation protection layer 154 has been described in detail in the first embodiment, a detailed description thereof will be omitted.

[0100] Therefore, the temperature sensor 15 according to the second embodiment of the present invention can improve marketability by commercializing only the temperature sensor 15 separately from the secondary battery 1 according to the first embodiment.

[0101] Therefore, the scope of the present invention is defined by the appended claims rather than by the foregoing description and the exemplary embodiments described therein. Various modifications made within the meaning of equivalents of the claims of the present invention and within the scope of the claims should be regarded as within the scope of the present invention.

[0102] [reference numerals list]

[0103] 1: Secondary battery

[0104] 11: Electrode assembly

[0105] 111: Electrode connector

[0106] 12: bag

[0107] 121: Accommodation

[0108] 122: Sealing part

[0109] 13: Electrode lead

[0110] 131: Insert hole

[0111] 14: Lead film

[0112] 15: Temperature sensor

[0113] 151: Temperature measurement unit

[0114] 1511: Thermistor chip

[0115] 152: Connector

[0116] 153: Connection

[0117] 154: Antioxidant protective layer

[0118] 155: Strengthening layer

[0119] 156: Sealing material

Claims

1. A secondary battery, comprising: Electrode assembly; a bag configured to contain the electrode assembly; an electrode lead connected to an electrode tap provided on the electrode assembly, a front end of the electrode lead being drawn out of the bag, and an insertion hole extending from the inside of the bag to the outside thereof being defined in the electrode lead; as well as A temperature sensor is inserted into the insertion hole, wherein the temperature sensor includes a temperature measuring part and a connector, the temperature measuring part is disposed inside the bag to measure the temperature inside the bag, and the connector is disposed outside the bag.

2. The secondary battery according to claim 1, wherein The temperature sensor is provided to have a thickness less than or equal to a thickness of the electrode lead in which the insertion hole is defined.

3. The secondary battery according to claim 1, wherein The temperature measuring part is coated with an anti-oxidation protective layer.

4. The secondary battery according to claim 3, wherein The anti-oxidation protective layer is provided as a polymer coating, and The polymer coating is made of polyparaxylene material.

5. The secondary battery according to claim 1, wherein A lead film is provided on the electrode lead arranged on the sealing portion of the bag, The temperature sensor is provided with a connection portion which is provided between the temperature measuring portion and the connector and is in contact with the lead film, and The connection portion is provided with a reinforcement layer, and the reinforcement layer increases adhesion to the lead film.

6. The secondary battery according to claim 5, wherein The reinforcement layer is made of a metal material plated on the connection portion. 7 . The secondary battery according to claim 5 , further comprising a sealing material provided between the temperature sensor and an inner wall of the insertion hole to seal a gap between the temperature sensor and the inner wall of the insertion hole.

8. The secondary battery according to claim 7, wherein The sealing material is made of the same material as the lead film.

9. A method for manufacturing a secondary battery, the method comprising the following steps: Step (a), the step (a) preparing a temperature sensor; Step (b) of cutting a surface of one side of the electrode lead to form an insertion hole; Step (c), the step (c) is to connect the rear end of the electrode lead to the electrode connector of the electrode assembly and insert the temperature sensor into the insertion hole of the electrode lead; Step (d) of housing the electrode assembly in a bag, wherein the temperature measuring portion of the temperature sensor is disposed inside the bag, and the connector of the temperature sensor is disposed outside the bag.

10. The method according to claim 9, wherein: In the step (b), the temperature sensor is provided to have a thickness less than or equal to a thickness of the electrode lead defining the insertion hole.

11. The method according to claim 9, wherein: The step (a) further comprises the step of coating an anti-oxidation protective layer on the surface of the temperature measuring part. Wherein, the anti-oxidation protection layer is formed by depositing a polyparaxylene coating on the temperature measuring part.

12. The method according to claim 9, wherein: The step (a) further includes forming a reinforcing layer for increasing the adhesive force of the connection portion provided between the temperature measuring device and the connector. Wherein, the reinforcement layer is made of metal material and is formed by plating on the surface of the connection part.

13. The method according to claim 9, wherein: The step (c) further includes a step of inserting a sealing material into a gap between an inner wall of the insertion hole and the temperature sensor to seal the gap after the temperature sensor is inserted into the insertion hole of the electrode lead.

14. The method according to claim 9, further comprising after step (d): Step (e), the step (e) is to arrange a lead film surrounding the electrode lead so as to pass between the temperature measuring part and the connector; as well as A process of sealing a portion of a sealed portion of the bag, injecting an electrolyte into a non-sealed portion of the bag to impregnate the electrode assembly, and sealing the non-sealed portion of the bag to manufacture a secondary battery.

15. A temperature sensor, comprising: a temperature measuring portion having a thermistor provided on one end thereof to measure temperature; a connector disposed on the other end thereof; as well as a connecting portion configured to connect the temperature measuring portion to the connector, Wherein, the connecting portion is provided with a reinforcement layer for increasing the adhesive force.

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