Button type lithium ion battery with PTC (Positive Temperature Coefficient)

Abstract

The utility model relates to a button type lithium ion battery with a PTC (Positive Temperature Coefficient), which belongs to the technical field of batteries and comprises a battery shell, a battery anode cap and the PTC arranged in the battery shell, a battery cathode column and the battery anode cap are arranged in the battery shell, the PTC is positioned between the battery cathode column and the battery anode cap, and the PTC is positioned between the battery cathode column and the battery anode cap. Stainless steel plugs are arranged on the two opposite sides of the PTC, sealant used for sealing and supporting is arranged on the outer side of the PTC, the PTC is electrically connected with the battery negative pole through a PTC connecting piece, the PTC cuts off current and protects the battery from being damaged, and when the temperature is reduced to be below the safe temperature, the battery recovers to work normally. According to the button type lithium ion battery with the PTC, when high temperature and high heat are caused by internal short circuit in the use process of the battery, the PCT cuts off current to stop thermal runaway, so that the battery is prevented from exploding and firing.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a button-type lithium-ion battery with a PTC. Background Art

[0002] A button-type lithium-ion battery, also known as a button battery, refers to a battery with an outer shape like a small button. Generally, it has a relatively large diameter and a relatively thin thickness.

[0003] Currently, PTCs are all connected outside the battery or used in combination with a certain component of the battery, increasing the thickness of the battery and causing inconvenience to the use of electrical appliances. Especially for electrical appliances using button-type lithium batteries, which have a small volume, strict reliability requirements, and high safety requirements, installing it outside the battery cannot meet the usage requirements.

[0004] Therefore, a button-type lithium-ion battery with a PTC is proposed to solve the problems mentioned above. Content of the Utility Model

[0005] In view of the deficiencies of the prior art, the utility model provides a button-type lithium-ion battery with a PTC, which can install the PTC inside the battery to ensure its use safety strength and other effects without affecting the overall performance of the battery.

[0006] To achieve the above object, the utility model provides the following technical solutions: including a battery case, a battery positive cap, and a PTC built inside the battery case. The battery case internally houses a battery negative terminal and a battery positive cap, and the PTC is located between the battery negative terminal and the battery positive cap;

[0007] Stainless steel plugs are arranged on opposite sides of the PTC, and a sealant for sealing and supporting is arranged outside the PTC;

[0008] The PTC is electrically connected to the battery negative terminal through a PTC connecting piece, and the PTC is connected to the inner wall of the battery case through a connecting bar.

[0009] Preferably, the PTC is located at the center of the interior of the battery case, and a copper foil or a nickel sheet is welded to the PTC.

[0010] Preferably, the PTC is bonded to the inner wall of the battery case through the sealant, and the PTC is completely immersed in the sealant, and the sealant is in a fully sealed state with respect to the PTC.

[0011] Preferably, the PTC connecting piece is inserted into and penetrates through the sealant, and opposite ends of the PTC connecting piece are respectively electrically connected to the battery negative terminal and the PTC.

[0012] Preferably, the connecting strip penetrates through and extends into the sealant, and two opposite ends of the connecting strip are respectively connected to the sealant and the inner wall of the battery case.

[0013] Preferably, the PTC connecting piece includes two built-in guide rods, and the two guide rods are connected in a staggered distribution.

[0014] Preferably, the upper guide rod extends into the battery negative electrode post and is electrically connected thereto, and the lower guide rod is inserted into the sealant and is electrically connected to the PTC.

[0015] Compared with the prior art, the present utility model provides a button-type lithium-ion battery with PTC, having the following beneficial effects:

[0016] 1. For the button-type lithium-ion battery with PTC, when the battery generates high temperature due to external overcurrent during use, the PTC cuts off the current to protect the battery from damage, and the battery resumes normal operation when the temperature drops below the safe temperature.

[0017] 2. For the button-type lithium-ion battery with PTC, when the battery generates high temperature and heat due to internal short circuit during use, the PCT cuts off the current to terminate thermal runaway and prevent the battery from exploding and catching fire.

[0018] 3. The button-type lithium-ion battery with PTC has high safety, enabling the device to be safely used in various environments.

[0019] 4. For the button-type lithium-ion battery with PTC, by placing the PTC inside the battery case, it can provide a protection effect without affecting its overall size. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0021] Figure 2 is a schematic structure diagram of the PTC connection method of the present utility model;

[0022] Figure 3 is a schematic structure diagram of the connection state of the PTC connecting piece of the present utility model.

[0023] In the figure: 1. Battery case; 2. Battery positive cap; 201. Connecting strip; 3. Stainless steel plug; 4. Sealant; 5. PTC; 6. Battery negative electrode post; 7. PTC connecting piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment:

[0026] Please refer to Figure 1 - Figure 3 In this embodiment, a button lithium-ion battery with a PTC includes a battery housing 1, a battery positive cap 2, and a PTC 5 disposed inside the battery housing 1. A battery negative terminal 6 and a battery positive cap 2 are disposed inside the battery housing 1, and the PTC 5 is located between the battery negative terminal 6 and the battery positive cap 2;

[0027] Stainless steel plugs 3 are disposed on opposite sides of the PTC 5, and a sealant 4 for sealing and supporting is disposed outside the PTC 5;

[0028] The PTC 5 is electrically connected to the battery negative terminal 6 through a PTC connecting piece 7, and the PTC 5 is connected to the inner wall of the battery housing 1 through a connecting strip 201;

[0029] Among them, PTC is the abbreviation of Positive Temperature Coefficient, which means a semiconductor material or component with a positive temperature coefficient, especially the PTC thermistor commonly found in circuits;

[0030] Secondly, first solder a copper foil or nickel sheet to the PTC 5 using soldering or laser soldering, and then install it into the battery housing 1, so that one end is welded to the battery negative terminal 6 and the other end is welded to the inner wall of the battery housing 1;

[0031] At this time, when the battery housing 1 generates high temperature due to external overcurrent during use, the PTC 5 cuts off the current to protect the battery housing 1 from damage. When the temperature drops below the safe temperature, the battery housing 1 resumes normal operation. When the battery housing 1 generates high temperature and heat due to internal short circuit during use, the PTC 5 cuts off the current to terminate thermal runaway and prevent the battery housing 1 from exploding and catching fire. How the PTC 5 specifically cuts off the current and performs detection in different environments are all prior arts, so they are not described in detail in this embodiment. Therefore, by installing the PTC 5 inside the battery housing 1, while ensuring the normal operation of the battery housing 1, the safety strength of the battery housing 1 during use is guaranteed.

[0032] Please refer to Figure 1 - Figure 3, the PTC5 is located at the center inside the battery case 1, and a copper foil or a nickel sheet is welded to the PTC5.

[0033] The PTC5 is bonded to the inner wall of the battery case 1 by the sealant 4, and the PTC5 is completely immersed in the sealant 4. The sealant 4 is in a fully sealed state with respect to the PTC5;

[0034] By using methods such as soldering or laser welding, first weld the copper foil or nickel sheet to the PTC5 to ensure the safety and reliability during its normal use, and use the functional sealant 4 to completely wrap the PTC5. While ensuring the stable position of the PTC5 during use, it prevents the PTC5 from contacting the outer electrolyte and causing losses and misjudgment situations, and ensures the accuracy during its detection and use.

[0035] Please refer to Figure 1 - Figure 3 , the PTC connecting piece 7 is inserted into and penetrates through the sealant 4 to its interior, and the opposite ends of the PTC connecting piece 7 are electrically connected to the battery negative terminal 6 and the PTC5 respectively.

[0036] The connecting bar 201 penetrates through the sealant 4 and extends to its interior, and the opposite ends of the connecting bar 201 are connected to the sealant 4 and the inner wall of the battery case 1 respectively.

[0037] Through the synchronous sealing protection of the sealant 4 at the connection positions of the PTC5 with the two PTC connecting pieces 7 and the connecting bar 201 on both sides, while ensuring the stable connection position, it ensures the safety during its connection and use, so that the PTC5 can be safely connected to the battery negative terminal 6 and the inner wall of the battery case 1, ensuring the accuracy and durability of the detected circuit.

[0038] Please refer to Figure 1 - Figure 3 , the PTC connecting piece 7 includes two built-in guide rods, and the two guide rods are connected in a staggered distribution.

[0039] The upper guide rod extends into the battery negative terminal 6 and is electrically connected to it, and the lower guide rod is inserted into the sealant 4 and is electrically connected to the PTC5.

[0040] Under the connection and current conduction of the PTC connecting piece 7, it ensures the normal connection effect among the PTC5, the PTC connecting piece 7, and the battery negative terminal 6, providing a stable support for its detection.

[0041] In use, first, solder a copper foil or a nickel sheet to the PTC5 using soldering or laser welding, and then install it into the battery case 1, making one end welded to the negative terminal post 6 of the battery and the other end welded to the inner wall of the battery case 1. When the battery case 1 generates high temperature due to external overcurrent during use, the PTC5 cuts off the current to protect the battery case 1 from damage. When the temperature drops below the safe temperature, the battery case 1 resumes normal operation. When the battery case 1 generates high temperature and heat due to internal short circuit during use, the PTC5 cuts off the current to terminate thermal runaway and prevent the battery case 1 from exploding and catching fire.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A button-type lithium-ion battery with a PTC, comprising a battery housing (1), a battery positive electrode cap (2), and a PTC (5) built into the battery housing (1), characterized in that: The battery housing (1) has a battery negative electrode column (6) and a battery positive electrode cap (2) built into it, and the PTC (5) is located between the battery negative electrode column (6) and the battery positive electrode cap (2); Stainless steel plugs (3) are provided on opposite sides of the PTC (5), and a sealant (4) for sealing support is provided on the outside of the PTC (5); The PTC (5) is electrically connected to the battery negative electrode column (6) via a PTC connecting sheet (7), and the PTC (5) is connected to the inner wall of the battery housing (1) via a connecting strip (201).

2. A button-type lithium-ion battery with PTC according to claim 1, characterized in that: The PTC (5) is located at the center of the battery housing (1), and a copper foil or a nickel sheet is welded to the PTC (5).

3. A button-type lithium-ion battery with PTC according to claim 1, characterized in that: The PTC (5) is bonded to the inner wall of the battery housing (1) through the sealant (4), and the PTC (5) is completely immersed in the sealant (4), so that the sealant (4) fully seals the PTC (5).

4. A button-type lithium-ion battery with PTC according to claim 3, characterized in that: The PTC connecting piece (7) is plugged into the sealant (4) and penetrates into the interior thereof, and opposite ends of the PTC connecting piece (7) are electrically connected to the battery negative electrode column (6) and the PTC (5) respectively.

5. A button-type lithium-ion battery with PTC according to claim 4, characterized in that: The connecting strip (201) and the sealant (4) penetrate and extend into the interior thereof, and opposite ends of the connecting strip (201) are respectively connected to the sealant (4) and the inner wall of the battery housing (1).

6. A button-type lithium-ion battery with PTC according to claim 5, characterized in that: The PTC connecting piece (7) comprises two built-in guide rods, and the two guide rods are connected in a staggered distribution.

7. A button-type lithium-ion battery with PTC according to claim 6, characterized in that: The upper guide rod extends into the interior of the battery negative pole (6) and is electrically connected thereto, and the lower guide rod is inserted into the interior of the sealant (4) and is electrically connected to the PTC (5).

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