Lithium ion battery capable of realizing real-time temperature monitoring in battery cell

Abstract

The utility model relates to a lithium ion battery capable of realizing real-time temperature monitoring in a battery cell, which comprises a shell, a roll core and a cover plate, and the top of the shell is open; the roll core is arranged in the shell; the cover plate is hermetically connected to the opening, at least one temperature sensing line is integrated on the cover plate, and one end of the temperature sensing line extends into the roll core; the other end of the temperature sensing line extends out of the cover plate and is used for being connected with an external temperature recorder. The cover plate and the temperature sensing line of the lithium ion battery are integrated, and the temperature sensing line extends into different positions in the battery cell, so that the real internal temperature condition of the lithium ion battery in the use process and even under the abuse condition can be monitored in real time, reasonable use and safety monitoring of the lithium ion battery are facilitated, and the use safety of the lithium ion battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and detection, and in particular to a lithium-ion battery capable of realizing real-time temperature monitoring inside a battery cell. Background Art

[0002] Since their commercialization, lithium-ion batteries have been widely used due to their high energy density, long cycle life, low self-discharge, and lack of memory effect. However, lithium batteries generate heat during use, causing internal temperature increases. Under conditions of abuse or short circuits, the cell temperature can continue to rise, causing the electrolyte inside the battery to decompose and generate side reactions, resulting in a temperature rise without gas production. When the temperature rises to a certain level, the diaphragm contracts, causing an internal short circuit, bringing the positive and negative active materials into contact. This causes a sharp rise in heat, decomposition of the electrolyte material, and gas production, increasing internal pressure and potentially causing the battery casing to explode. Therefore, to improve the safety of lithium-ion batteries, monitoring the internal temperature of lithium-ion batteries is essential.

[0003] The patent is called a lithium battery that can detect internal temperature and pressure. A PCB board is provided at the bottom of the base. A temperature sensor and a pressure sensor are provided on the side of the PCB board facing the inside of the shell. A data transmission line is connected to the PCB board. A through hole is provided on the base, and one end of the data transmission line extends out of the shell through the through hole. However, there are certain problems with this patent: First, the sensor of this patent is set on the PCB board, and it actually monitors the temperature and pressure at the bottom of the lithium battery, and cannot truly monitor the internal conditions of the lithium battery. Second, this patent cannot monitor the internal conditions of the battery during operation. Third, this patent uses high-temperature sealant to seal the through hole for the data transmission line, which may lead to leakage caused by poor sealing of the battery cell after assembly, and inaccurate temperature and pressure data collection. Summary of the Invention

[0004] In response to at least one of the problems in the above-mentioned prior art, the purpose of the present invention is to provide a lithium-ion battery that can realize real-time temperature monitoring inside the battery cell. The temperature sensing wire extends into the interior of the battery cell, which can monitor the temperature inside the battery cell in real time, thereby improving the safety of the lithium-ion battery.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A lithium-ion battery capable of achieving real-time temperature monitoring inside a battery cell, comprising:

[0007] a housing having an open top;

[0008] a winding core, disposed in the shell;

[0009] A cover plate is tightly connected to the opening, and the cover plate is integrated with at least one temperature sensing wire, one end of which extends into the winding core; the other end of the temperature sensing wire extends out of the cover plate for connection to an external temperature recorder.

[0010] The present invention is provided with a temperature sensing line extending into the interior of the battery core, and an external temperature recorder can monitor the temperature inside the battery core in real time, thereby improving the safety of the lithium ion battery.

[0011] Preferably, a temperature sensing wire hole is opened on the cover plate, and the temperature sensing wire passes through the temperature sensing wire hole.

[0012] Preferably, the temperature sensing wire and the temperature sensing wire hole are sealed by injection molding.

[0013] Preferably, a plurality of temperature-sensitive wires are provided, each extending into different positions in the winding core.

[0014] Preferably, the temperature sensing wire is a K-type thermocouple.

[0015] Preferably, the temperature sensing wire is fixed in the winding core by an insulating high-temperature resistant tape.

[0016] Preferably, the winding core is provided with a positive electrode tab and a negative electrode tab.

[0017] Preferably, a positive electrode column and a negative electrode column are provided on the cover plate, which are connected to the positive electrode tab and the negative electrode tab respectively.

[0018] Preferably, a liquid injection hole is provided on the cover plate.

[0019] Preferably, a plug is provided on the liquid injection hole, and the plug and the liquid injection hole are sealed by laser welding.

[0020] The utility model has the following advantages due to the adoption of the above technical solution:

[0021] 1. The present invention provides a lithium-ion battery capable of real-time temperature monitoring inside the battery cell. The cover and temperature sensing wires are integrated into one body. The temperature sensing wires extend into different locations inside the battery cell, enabling real-time monitoring of the actual internal temperature during lithium use, even under conditions of abuse. This facilitates the rational use and safety monitoring of lithium-ion batteries, thereby improving the safety of lithium-ion battery use.

[0022] 2. The present invention provides a lithium-ion battery that can achieve real-time temperature monitoring inside the battery cell. The temperature sensing wire and cover plate solve the sealing problem through a well-sealed injection molding process, reducing the risk of leakage caused by poor sealing of high-temperature sealants in existing technical solutions and inaccurate temperature monitoring data.

[0023] 3. The lithium-ion battery provided by this utility model can realize real-time temperature monitoring of the internal temperature of the battery cell. It can monitor the temperature of different locations such as the innermost part and surface of the winding core in real time. It can provide feedback to the inspection personnel or users in the early stage of battery cell abnormality, thereby reducing safety risks.

[0024] 4. The lithium-ion battery provided by this utility model can realize real-time temperature monitoring of the internal temperature of the battery cell. It can monitor the most accurate real-time temperature data of different internal locations and surfaces of the lithium battery under different operating conditions, providing data support and basic data research accumulation for the research of the working status and abuse conditions of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a lithium-ion battery capable of achieving real-time temperature monitoring inside a battery cell, provided by an embodiment of the present invention.

[0026] Figure 2 It is a top view of the cover provided in this embodiment of the utility model.

[0027] Reference numerals in the figures:

[0028] 1 is the shell, 2 is the winding core, 201 is the positive electrode ear, 202 is the negative electrode ear, 3 is the cover plate, 301 is the positive electrode column, 302 is the negative electrode column, 4 is the temperature sensing line, 5 is the liquid injection hole, and 6 is the insulating high-temperature resistant tape. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution, and advantages of the present invention more clearly apparent, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "assembly," "disposition," and "connection" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] The utility model provides a lithium-ion battery capable of achieving real-time temperature monitoring inside a battery cell. The cover plate and the temperature sensing wire are integrated into one body. The temperature sensing wire extends into different positions inside the battery cell, and can monitor the temperature inside the battery cell in real time, thereby improving the safety of lithium-ion battery use.

[0033] Below, the embodiments of the present utility model are described in detail with reference to the accompanying drawings.

[0034] Example

[0035] Please refer to Figures 1 to 2 , this embodiment provides a lithium-ion battery capable of achieving real-time temperature monitoring inside a battery cell, comprising a housing 1, a winding core 2, and a cover plate 3;

[0036] The top of the housing 1 is open;

[0037] The winding core 2 is arranged in the housing 1;

[0038] The cover plate 3 is tightly connected to the opening and is integrated with at least one temperature sensing wire 4. One end of the temperature sensing wire 4 extends into the winding core 2; the other end of the temperature sensing wire 3 extends out of the cover plate 3 for connection to an external temperature recorder.

[0039] In specific applications, the housing 1 is a rectangular shell made of Al 3003-H14. The winding core 2 is a laminated structure consisting of a separator (outermost layer), a negative electrode, a separator, a positive electrode, a separator, a negative electrode, and a separator (outermost layer). The winding core 2 is equipped with positive and negative electrode tabs 201 and 202, located at the opening of the housing 1. After welding the positive and negative electrode tabs of the winding core 2 to the positive and negative electrode posts of the cover plate 3, the winding core 2 is directly placed inside the housing 1. The cover plate 3 is then laser-welded to the housing 1 to secure the winding core 2 within the housing 1. The cover plate 3 is a rectangular plate made of Al 3003-H14. The housing 1 and cover plate 4 are hermetically connected by laser welding. During lithium-ion battery testing or use, the temperature sensor 3 on the outside of the cover plate 3 is connected to a temperature recorder to monitor the internal temperature of the battery cell in real time.

[0040] In this embodiment, a temperature sensing wire hole is opened on the cover plate 3, and the temperature sensing wire 4 passes through the temperature sensing wire hole.

[0041] In specific applications, the temperature sensing wire hole is a round hole, one end of the temperature sensing wire 4 passes through the temperature sensing wire hole and extends into the winding core 2, and the temperature sensing wire 3 and the temperature sensing wire hole are sealed by injection molding to form an injection molded part 7. The material of the injection molded part 7 is an insulating material and is resistant to electrolyte corrosion.

[0042] In this embodiment, a plurality of temperature sensing wires 4 are provided, each extending into different positions in the winding core 2 .

[0043] In specific applications, the temperature sensing wires 4 can be inserted into different locations within the winding core 2 to monitor the temperature at multiple locations. Specifically, three temperature sensing wires 4 can be provided, one inserted into the center of the winding core 2, one near the base of the positive electrode tab 201, and one near the base of the negative electrode tab 202, respectively. This allows for temperature monitoring at three critical locations within the battery cell.

[0044] In this embodiment, when there are multiple temperature sensing wires 4 , the temperature sensing wires 4 may be in different colors, or marked on the temperature sensing wires 4 to identify which temperature sensing wire 4 monitors which position inside the battery cell.

[0045] In this embodiment, the temperature sensing wire 4 adopts a K-type thermocouple with high sensitivity.

[0046] In this embodiment, the temperature sensing wire 4 is fixed in the winding core by an insulating high-temperature resistant tape 6 .

[0047] In a specific application, the insulating high-temperature resistant tape 6 is a brown high-temperature tape used to fix the temperature sensing wire 4 at different positions in the winding core 10; the insulating high-temperature resistant tape 6 is a conventional product with good insulation and corrosion resistance.

[0048] In this embodiment, the winding core 2 is provided with a positive electrode tab 201 and a negative electrode tab 202 , and the cover plate 3 is provided with a positive electrode column 301 and a negative electrode column 302 , which are respectively connected to the positive electrode tab 201 and the negative electrode tab 202 .

[0049] In a specific application, the positive electrode column 301 and the negative electrode column 302 are connected to the positive electrode tab 201 and the negative electrode tab 202 respectively by welding. After the welding is completed, the positive electrode tab 201 and the negative electrode tab 202 are folded.

[0050] In this embodiment, a liquid injection hole 5 is provided on the cover plate 3 .

[0051] In a specific application, the electrolyte is injected into the housing 1 through the injection hole 5 .

[0052] In this embodiment, a plug is provided on the liquid injection hole 5 , and the plug and the liquid injection hole 5 are sealed by laser welding.

[0053] In a specific application, after the lithium-ion battery is refilled for the second time, the injection hole 5 is sealed with a plug, and the injection hole 5 and the plug are sealed by laser welding.

[0054] When manufacturing the lithium-ion battery of this embodiment that can realize real-time temperature monitoring inside the battery cell, the temperature sensing wire 4 is placed at different positions inside the winding core 2, such as the middle position of the winding core 2, the position close to the base of the positive electrode tab 201, and the position close to the base of the negative electrode tab 202, and the temperature sensing wire 4 is fixed and insulated with brown high-temperature tape 6. Figure 1 , weld the positive electrode tab 201 and negative electrode tab 202 of the winding core 2 and the positive electrode column 301 and negative electrode column 302 of the integrated cover plate 3, fold the tabs, fix the temperature sensing line 4, and then press the cover plate 3 into the shell as a whole, perform laser peripheral welding of the cover plate 3 and the shell 1, and then carry out the baking of the battery cell in sequence, inject liquid once through the injection hole 5, electrolyte infiltration, battery cell formation, high temperature standing, second liquid replenishment through the injection hole 5, laser sealing of the injection hole 5, and subsequent lithium ion battery helium leakage detection and capacity separation processes, and then perform K value screening and coating, thus obtaining a lithium ion battery that can realize real-time temperature monitoring inside the battery cell. The temperature sensing line 4 of the lithium battery of the embodiment is connected to an external temperature recorder to perform a low-temperature constant-power discharge test and collect temperature data of this lithium battery during low-temperature power discharge.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lithium-ion battery capable of achieving real-time temperature monitoring inside a cell, characterized in that: include: a housing having an open top; a winding core, disposed in the shell; A cover plate is tightly connected to the opening, and the cover plate is integrated with at least one temperature sensing wire, one end of which extends into the winding core; the other end of the temperature sensing wire extends out of the cover plate for connection to an external temperature recorder.

2. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: A temperature sensing wire hole is provided on the cover plate, and the temperature sensing wire passes through the temperature sensing wire hole.

3. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 2, characterized in that: The temperature sensing wire and the temperature sensing wire hole are sealed by injection molding.

4. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: The temperature sensing wires are provided in plurality and extend into different positions in the winding core respectively.

5. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: The temperature sensing wire is a K-type thermocouple.

6. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: The temperature sensing wire is fixed in the winding core by an insulating high-temperature resistant tape.

7. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: The winding core is provided with a positive electrode tab and a negative electrode tab.

8. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 7, characterized in that: The cover plate is provided with a positive electrode column and a negative electrode column, which are connected to the positive electrode tab and the negative electrode tab respectively.

9. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 1, characterized in that: The cover plate is provided with a liquid injection hole.

10. The lithium-ion battery capable of achieving real-time temperature monitoring inside the battery cell according to claim 9, characterized in that: The injection hole is provided with a plug, and the plug and the injection hole are sealed by laser welding.

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