Battery

Abstract

In order to solve the problems that in the prior art, when a battery is overcharged, internal pressure is too large or short circuit and fire occur, and a battery overcharge test cannot be passed, the utility model provides a battery which comprises a packaging part, a battery cell and a conductive pin, the packaging part is provided with an anti-explosion valve and a pole, the conductive pin is led out from the pole and extends to the anti-explosion valve, and the battery cell is provided with a first tab and a second tab. The first tab is provided with an easy-to-fuse point, the first tab is electrically connected with the pole, and the second tab is electrically connected with the anti-explosion valve; when the battery is in a working state, the anti-explosion valve is insulated from the conductive pin; and when the internal pressure of the battery reaches a threshold value, the explosion-proof valve is opened to release pressure and is electrically connected with the conductive pin. According to the battery provided by the utility model, gathered gas is generated in the battery, the explosion-proof valve is opened for exhausting, meanwhile, the fracture of the explosion-proof valve and the conductive pin form a short-circuit loop, and when the generated large current passes through the easy-to-fuse point, the easy-to-fuse point is fused by a large amount of heat, and an electric connection path is disconnected, so that short circuit caused by continuous overcharge of the battery by an external circuit is avoided; and the over-charge test passing capability of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel shell button batteries, and in particular relates to a battery. Background Art

[0002] Steel case button batteries are a common small portable power source widely used in various electronic devices, such as calculators, watches, remote controls and various electronic instruments. They are usually composed of a stainless steel casing, a positive electrode cover, a negative electrode, as well as electrolytes and active materials. During the design and manufacturing process, it is crucial to ensure the safety of the battery, including the ability to prevent short circuits and overcharge.

[0003] The outer shell of the steel shell button battery is also part of the conductivity. If the insulating layer on the outside of the battery is damaged, or the internal structure is deformed due to mechanical pressure during the assembly process, it may cause direct contact between the positive and negative electrodes, causing a short circuit. The short circuit will cause the internal temperature of the battery to rise rapidly, and may even cause thermal runaway, causing the internal temperature of the battery to rise and produce a large amount of gas. If the gas is not extracted or discharged in time, the increase in internal pressure of the battery may cause battery explosion and other problems. In addition, the battery cannot pass the overcharge test if there are defects or short circuits. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery for the problem that when the battery in the prior art is overcharged, the internal pressure of the battery is too large to cause a short circuit, causing explosion or fire, and the battery cannot pass the overcharge test.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] A battery is provided, comprising a packaging component, a battery cell and a conductive pin, wherein the battery cell is placed in the packaging component, an explosion-proof valve and a pole are provided on the packaging component, and the pole is insulated from the packaging component, the conductive pin is led out from the pole and extends to the position of the explosion-proof valve, a first pole ear and a second pole ear are provided on the battery cell, a fusible breaking point is provided on the first pole ear, the first pole ear is electrically connected to the pole, and the second pole ear is electrically connected to the explosion-proof valve; in the working state of the battery, the explosion-proof valve and the conductive pin are insulated from each other; when the internal pressure of the battery reaches a threshold value, the explosion-proof valve is opened and forms an electrical connection with the conductive pin.

[0007] Optionally, the packaging component includes a cover plate and a shell, the shell is a semi-closed shell with one end open, and the cover plate closes the opening of the shell.

[0008] Optionally, the explosion-proof valve is electrically connected to the shell or the cover plate, the second pole ear is led out from a side of the battery cell facing away from the cover plate and is electrically connected to the shell, and the shell is electrically connected to the cover plate.

[0009] Optionally, the explosion-proof valve is a semi-enclosed notch formed on the shell or the cover plate.

[0010] Optionally, the package further includes a first insulating layer, which is disposed between the pole and the cover plate, and is used to isolate the pole from the cover plate.

[0011] Optionally, the package further includes a second insulating layer, which is disposed between the shell and the conductive pin, and is used to isolate the shell from the conductive pin.

[0012] Optionally, the cover plate is made of aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys, or copper and its alloys.

[0013] Optionally, a notch and / or a through hole is provided on the first pole lug, and the notch and / or the through hole form the fusible point on the first pole lug.

[0014] Optionally, the second electrode tab is connected to the explosion-proof valve by welding.

[0015] Optionally, the battery cell is a wound battery cell or a laminated battery cell.

[0016] The battery provided by the utility model comprises a packaging component, a battery cell and a conductive pin, wherein the battery cell is placed in the packaging component, an explosion-proof valve and a pole are arranged on the packaging component, a fusible breaking point is arranged on the first pole ear, the first pole ear is electrically connected to the pole, the conductive pin is led out and extended to the position of the explosion-proof valve, when the battery is in a heat-generating state and a large amount of accumulated gas is generated inside the battery, the internal pressure of the battery reaches a threshold value, the explosion-proof valve is opened to exhaust, and at the same time, a short-circuit loop is formed between the explosion-proof valve and the conductive pin, and a large amount of heat is generated when a large current generated by the short-circuit loop passes through the fusible breaking point, the fusible breaking point is melted, and the electrical connection path is instantly disconnected, thereby preventing the external circuit from continuously overcharging the battery, preventing the entire battery from exploding and catching fire to cause a safety accident, and at the same time, it is beneficial to improve the ability of the battery to pass the overcharge test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a battery structure provided by an embodiment of the utility model.

[0018] The reference numerals in the drawings of the specification are as follows:

[0019] 1. Shell; 2. Cover; 3. Battery cell; 4. Conductive pin; 5. Explosion-proof valve; 6. Pole; 7. First pole ear; 71. Fusible breaking point; 8. Second pole ear; 9. Second insulating layer; 10. First insulating layer. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The utility model embodiment provides a battery, including a packaging component, a battery cell 3 and a conductive pin 4, wherein the battery cell 3 is placed in the packaging component, an explosion-proof valve 5 and a pole 6 are provided on the packaging component, and the pole 6 is insulated from the packaging component, the conductive pin 4 is led out from the pole 6 and extends to the position of the explosion-proof valve 5, the battery cell 3 is provided with a first pole ear 7 and a second pole ear 8, the first pole ear 7 is provided with a fusible breaking point 71, the first pole ear 7 is electrically connected to the pole 6, and the second pole ear 8 is electrically connected to the explosion-proof valve 5; in the working state of the battery, the explosion-proof valve 5 and the conductive pin 4 are insulated from each other; when the internal pressure of the battery reaches a threshold value, the explosion-proof valve 5 is opened and electrically connected to the conductive pin 4.

[0024] It should be noted that due to the small size and high sealing of steel shell button batteries, there are still challenges in overcharge testing. In addition to the need to accurately control the current and voltage during the test, it is also necessary to monitor the temperature and pressure changes of the battery. During the charging process, the chemical reaction inside the battery causes excessive gas to be produced, increasing the internal pressure. Excessive internal gas pressure in the battery may cause a short circuit, making it impossible to pass the overcharge test.

[0025] Specifically, the battery provided by the utility model includes a package, a battery cell 3 and a conductive pin 4, the battery cell 3 is placed in the package, and an explosion-proof valve 5 and a pole 6 are provided on the package. A fusible break point 71 is provided on the first pole ear 7, and the first pole ear 7 is electrically connected to the pole 6, and the conductive pin 4 is led out and extended to the position of the explosion-proof valve 5. When the internal pressure of the battery reaches a threshold value, when a large amount of accumulated gas is generated inside the battery, the explosion-proof valve 5 is opened to exhaust and release pressure. After the explosion-proof valve 5 is opened, the explosion-proof valve 5 and the conductive pin 4 form a short-circuit loop, and the current generated by the short circuit melts the fusible break point 71 to form an open circuit, that is, the electrical connection path of the battery cell 3 is disconnected, thereby blocking the continued gas production inside the battery, reducing the internal pressure of the battery, and improving or avoiding problems such as battery short circuit caused by excessive internal gas pressure of the battery, thereby improving or enhancing the ability of the battery to pass the overcharge test.

[0026] Specifically, when the internal pressure of the battery described in the present application reaches a set threshold, the semi-enclosed notch on the explosion-proof valve 5 is opened, and the pressure is released through the semi-enclosed notch.

[0027] Reference Figure 1 In one embodiment, the packaging component includes a cover plate 2 and a shell 1 , wherein the shell 1 is a semi-enclosed shell with one end open, and the cover plate 2 closes the opening of the shell 1 .

[0028] Specifically, the battery cell 3 is loaded into the shell 1 from the opening of the shell 1, and the electrolyte is injected into the inner cavity of the shell 1 through the injection hole. After the injection or formation is completed, the injection port is closed, and finally the cover plate 2 is used for packaging to obtain an internally closed and fully assembled battery.

[0029] Specifically, the housing 1 may be a square housing, a cylindrical housing, a prismatic housing, or a housing in other shapes.

[0030] In one embodiment, the explosion-proof valve 5 is electrically connected to the shell 1 or the cover plate 2 , the second pole tab 8 is led out from a side of the battery cell 3 facing away from the cover plate 2 and is electrically connected to the shell 1 , and the shell 1 is electrically connected to the cover plate 2 .

[0031] Specifically, when a large amount of accumulated gas is generated inside the battery and the internal pressure of the battery exceeds the threshold of the explosion-proof valve 5, the explosion-proof valve 5 will open and the gas will be quickly discharged through the explosion-proof valve 5 at the moment of opening. The explosion-proof valve 5 in the present application is electrically connected to the cover plate 2, and the electrical connection with the second pole ear 8 is cut off at the moment when the explosion-proof valve 5 is opened. After the explosion-proof valve 5 is opened, the explosion-proof valve 5 and the conductive pin 4 form a short-circuit loop, and the current generated by the short circuit melts the fusible point 71 to form an open circuit, that is, the electrical connection path of the battery cell 3 is disconnected, thereby blocking the continued gas production inside the battery, reducing the internal pressure of the battery, and improving or avoiding problems such as battery short circuit caused by excessive internal gas pressure of the battery, thereby improving or enhancing the battery's ability to pass the overcharge test.

[0032] Specifically, when the explosion-proof valve 5 is electrically connected to the shell 1, and the second pole ear 8 is connected to the shell 1, the working principle and effect of this setting are the same as the effect of the explosion-proof valve 5 set on the cover plate 2. The explosion-proof valve 5 can form a short-circuit loop with the conductive pin 4 at the moment when it is opened. The current generated by the short circuit melts the fusible point 71 to form an open circuit, that is, the electrical connection path of the battery cell 3 is disconnected, thereby blocking the continued gas production inside the battery, reducing the internal pressure of the battery, improving or avoiding problems such as battery short circuit caused by excessive internal gas pressure of the battery, and thereby improving or enhancing the battery's ability to pass the overcharge test; specifically, the battery provided in the present application does not limit the specific setting position of the explosion-proof valve 5.

[0033] In one embodiment, the explosion-proof valve 5 is a semi-enclosed notch formed on the housing 1 or the cover plate 2 .

[0034] The explosion-proof valve 5 is used to prevent explosion or damage caused by excessive internal pressure of the battery; specifically, when the pressure inside the battery system exceeds a preset safety value, the semi-enclosed notched explosion-proof valve 5 will automatically open, and the material at the notched position will break first under the action of pressure, and the explosion-proof valve will then open to relieve pressure, releasing excess pressure and preventing explosion of pipelines or equipment due to excessive pressure.

[0035] In one embodiment, the battery further includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is connected to the first electrode tab 7 or the second electrode tab 8 , and the negative electrode sheet is connected to the first electrode tab 7 or the second electrode tab 8 .

[0036] Specifically, the positive electrode sheet is connected to the first electrode tab 7 or the second electrode tab 8, and the negative electrode sheet is connected to the first electrode tab 7 or the second electrode tab 8, so that the first electrode tab 7 and the second electrode tab 8 can conduct current from the positive electrode sheet or the negative electrode sheet to other electronic components of the battery, thereby reducing the connection impedance without reducing the energy density of the battery.

[0037] In one embodiment, the package further includes a first insulating layer 10 , which is disposed between the pole 6 and the cover plate 2 , and is used to isolate the pole 6 from the cover plate 2 .

[0038] Specifically, the pole 6 in the battery mainly plays the role of conducting current. The first insulating layer 10 provided between the pole 6 and the cover plate 2 can well isolate the pole 6 and the cover plate 2 to avoid short circuit caused by direct contact between the two.

[0039] Specifically, the second insulating layer 9 may be made of polyethylene, polypropylene, EPDM rubber, polyimide or other materials that have good insulating effects.

[0040] In one embodiment, the package further includes a second insulating layer 9 , which is disposed between the housing 1 and the conductive pin 4 , and is used to isolate the housing 1 from the conductive pin 4 .

[0041] Specifically, the second insulating layer 9 is used to isolate the housing 1 and the conductive pin 4 to avoid a short circuit caused by direct contact between the two.

[0042] Specifically, the second insulating layer 9 may be made of polyethylene, polypropylene, EPDM rubber, polyimide or other materials that have good insulating effects.

[0043] In one embodiment, the cover plate 2 is made of aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys, or copper and its alloys.

[0044] In one embodiment, a notch and / or a through hole is provided on the first pole tab 7 , and the notch and / or the through hole form the fusible point 71 on the first pole tab 7 .

[0045] Specifically, electronic products are generally equipped with thermal-sensitive components such as fuses or cutouts. After the current exceeds the specified value for a period of time, the thermal-sensitive component uses the heat generated by itself to passively melt the fuse or actively cut off the fuse, thereby quickly cutting off the electrical connection when thermal runaway occurs in the electronic product, avoiding greater safety problems with the electronic product.

[0046] The purpose of setting the fusible point 71 in the present application is also to disconnect the electrical connection between the first pole ear 7 and the pole 6 when the internal pressure of the battery reaches a threshold value, thereby cutting off the electrical connection path of the battery cell 3. Since a large current and heat are generated after a short circuit, the fusible point 71 can be easily melted to achieve the purpose of cutting off the electrical connection path of the battery cell 3.

[0047] In one embodiment, the battery cell 3 is a wound battery cell or a laminated battery cell.

[0048] In one embodiment, the second electrode tab 8 and the explosion-proof valve 5 are connected by welding.

[0049] Specifically, the welding includes ultrasonic welding or laser welding.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: The invention comprises a package, a battery cell and a conductive pin, wherein the battery cell is placed in the package, an explosion-proof valve and a pole are arranged on the package, and the pole is insulated from the package, the conductive pin is led out from the pole and extends to the position of the explosion-proof valve, a first pole ear and a second pole ear are arranged on the battery cell, a fusible breaking point is arranged on the first pole ear, the first pole ear is electrically connected to the pole, and the second pole ear is electrically connected to the explosion-proof valve; in the working state of the battery, the explosion-proof valve and the conductive pin are insulated from each other; when the internal pressure of the battery reaches a threshold value, the explosion-proof valve opens and forms an electrical connection with the conductive pin.

2. A battery according to claim 1, characterized in that: The packaging component comprises a cover plate and a shell, wherein the shell is a semi-enclosed shell with one end open, and the cover plate closes the opening of the shell.

3. A battery according to claim 2, characterized in that: The explosion-proof valve is electrically connected to the shell or the cover plate, the second pole tab is led out from a side of the battery cell away from the cover plate and is electrically connected to the shell, and the shell is electrically connected to the cover plate.

4. A battery according to claim 3, characterized in that: The explosion-proof valve is a semi-enclosed notch formed on the shell or the cover plate.

5. A battery according to claim 2, characterized in that: The package also includes a first insulating layer, which is disposed between the pole and the cover plate, and is used to isolate the pole from the cover plate.

6. A battery according to claim 2, characterized in that: The package also includes a second insulating layer, which is disposed between the shell and the conductive pins, and is used to isolate the shell from the conductive pins.

7. A battery according to claim 2, characterized in that: The cover plate is made of aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys, or copper and its alloys.

8. A battery according to claim 1, characterized in that: The first pole tab is provided with a notch and / or a through hole, and the notch and / or the through hole form the fusible point on the first pole tab.

9. A battery according to claim 1, characterized in that: The second electrode tab is connected to the explosion-proof valve by welding.

10. A battery according to claim 1, characterized in that: The battery core is a wound battery core or a laminated battery core.

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