CN107516748B - Battery protection device and protection method - Google Patents
Battery protection device and protection method Download PDFInfo
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- CN107516748B CN107516748B CN201710663338.9A CN201710663338A CN107516748B CN 107516748 B CN107516748 B CN 107516748B CN 201710663338 A CN201710663338 A CN 201710663338A CN 107516748 B CN107516748 B CN 107516748B
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- battery
- protection device
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- wire
- elastic sheet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a battery protection device and a protection method, wherein the protection device comprises a shell, and the shell is made of a heat-conducting insulating material; the inner side of the shell is provided with a conducting strip, an elastic sheet and a metal wire, wherein the conducting strip is contacted with the elastic sheet, the elastic sheet is fixedly connected with one end of the metal wire, and the other end of the metal wire is fixedly arranged on the shell; the metal wire is made of memory alloy; two wires are arranged on the outer side of the shell, one wire is electrically connected with the conducting strip, and the other wire is electrically connected with the elastic sheet; the protection method utilizes a protection device to absorb the heat of the battery, one conducting wire is electrically connected with the positive electrode of the battery, and the other conducting wire is used as the output conducting wire of the positive electrode of the battery. After the battery heats, the memory alloy deforms, so that the positive electrode of the battery is disconnected with the positive electrode output lead of the battery, and the positive electrode of the battery is short-circuited; when the temperature of the battery is reduced, the memory alloy is reduced, the positive electrode of the battery is connected with the positive electrode output lead of the battery, and the positive electrode of the battery is put into use. Therefore, the invention effectively protects the battery, and has the advantages of low cost, sensitive induction, small volume and convenient use.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a battery protection device and a battery protection method.
Background
At present, in the electronic industry, lithium batteries are widely used, so that the safety problem of the batteries is increasingly highlighted. In order to solve the technical problem of battery safety, the current measures are mainly to arrange a triple protection mechanism in a single lithium ion battery. Firstly, a switching element is adopted, when the temperature in the battery rises, the resistance value of the switching element rises along with the temperature rise, and when the temperature is too high, the power supply can be automatically stopped; secondly, selecting proper separator materials, and when the temperature rises to a certain value, the micron-sized micropores on the separator can be automatically dissolved, so that lithium ions cannot pass through the micropores, and the internal reaction of the battery is stopped; and thirdly, a safety valve (namely an air vent at the top of the battery) is arranged, and when the internal pressure of the battery rises to a certain value, the safety valve is automatically opened, so that the use safety of the battery is ensured.
However, it is found that the battery heating and even explosion caused by the short circuit of the external circuit of the battery are important risks and hidden troubles in the long-term use process.
Disclosure of Invention
In view of the above disadvantages, the first technical problem to be solved by the present invention is: the battery protection device has the advantages of being low in cost, small in size and convenient to use.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a battery protection device comprises a shell, wherein the shell is made of a heat-conducting insulating material; an arc-shaped metal wire is arranged on the inner side of the shell and made of memory alloy; one end of the metal wire is fixedly arranged on the shell, the other end of the metal wire is connected with a conductive elastic sheet, the elastic sheet is also contacted with a conductive sheet fixedly arranged in the shell, and the elastic sheet is electrically connected with the conductive sheet through contact; two wires are arranged on the outer side of the shell, one of the wires is electrically connected with the conducting strip, and the other wire is electrically connected with the elastic sheet.
Preferably, the memory alloy is a nickel titanium memory alloy.
Preferably, the shell is made of heat-conducting plastic, and the heat-conducting plastic is plastic filled with ceramic powder.
Preferably, the conductive sheet is a copper sheet, and the copper sheet is fixedly arranged on the inner wall of the shell.
Preferably, the elastic sheet is a triangular conductive sheet, one corner of the elastic sheet is in contact with the conductive sheet, and the other corner of the elastic sheet is connected with the wire and the metal wire.
Based on the same inventive concept, the second technical problem to be solved by the invention is as follows: the battery protection method is sensitive in induction, convenient to use and capable of effectively protecting the battery.
A battery protection method, utilize the above-mentioned battery protection device to absorb the heat of the battery, and connect electrically a said wire and battery positive pole outside the said body of the said battery protection device, another said wire is regarded as the positive pole output wire of the battery; when the battery generates heat, the battery protection device disconnects the battery anode from the battery anode output lead; and when the battery is cooled, the battery protection device connects the battery anode with the battery anode output lead.
Preferably, the case of the battery protection device is attached to the surface of the battery to absorb heat of the battery.
Preferably, the lead electrically connected with the spring plate is electrically connected with the positive electrode of the battery, and the lead electrically connected with the copper sheet is used as the positive electrode output lead of the battery.
Preferably, the wire of the battery protection device is made of a nickel-titanium memory alloy; when the temperature of the battery protection device absorbing the heat of the battery is not less than 60 ℃, the arc-shaped bending angle of the metal wire is reduced to drive the elastic sheet to be separated from the conducting sheet, so that the disconnection between the battery anode and the battery anode output lead is realized; when the temperature of the battery protection device is lower than 60 ℃, the arc-shaped bending angle of the metal wire is reduced to drive the elastic sheet to contact with the conducting sheet again, and the connection between the battery anode and the battery anode output lead is realized.
After the technical scheme is adopted, the invention has the beneficial effects that:
because the battery protection device and the protection method of the invention, the protection device comprises a shell, wherein the inner side of the shell is provided with a conducting strip, an elastic sheet and a metal wire, the conducting strip is electrically connected with the elastic sheet through contact, the elastic sheet is fixedly connected with one end of the metal wire, and the other end of the metal wire is fixedly arranged on the shell; wherein the metal wire is made of memory alloy; two wires are arranged on the outer side of the shell, one wire is electrically connected with the conducting strip, and the other wire is electrically connected with the elastic sheet; the protection method is to utilize the protection device to absorb the heat of the battery, and electrically connect one conducting wire outside the shell of the protection device with the positive electrode of the battery, and use the other conducting wire as the output conducting wire of the positive electrode of the battery. When the battery heats, the protection device absorbs heat, and after the temperature rises to the metamorphosis temperature of the memory alloy, the arc bending angle of the metal wire is reduced, so that the positive electrode of the battery is disconnected with the positive electrode output lead of the battery; after the battery is cooled, and the temperature of the protection device is lower than the metamorphosis temperature of the memory alloy, the metal wire restores to reduce the arc-shaped bending angle, the positive electrode of the battery is connected with the positive electrode output lead of the battery, and the positive electrode of the battery is put into use. Therefore, the protection device and the protection method of the invention can short the anode of the battery when the battery generates heat due to faults such as short circuit of an external circuit, and the battery is effectively protected; but also has the advantages of low cost, sensitive induction, small volume and convenient use.
The shell is made of heat-conducting plastic which is filled with ceramic powder; the shell made of the material has the advantages of better heat conductivity and insulativity and low cost.
The shell of the battery protection device is attached to the surface of the battery to absorb the heat of the battery; the protection device can sensitively sense the heating state of the battery, and the battery is effectively and timely protected.
Because the metal wire of the battery protection device is made of nickel-titanium memory alloy; when the temperature of the battery protection device absorbing the heat of the battery is not less than 60 ℃, the arc-shaped bending angle of the metal wire is reduced to drive the elastic sheet to be separated from the conducting sheet, so that the disconnection of the battery anode and the battery anode output lead is realized; when the temperature of the battery protection device is lower than 60 ℃, the arc-shaped bending angle of the metal wire is reduced to drive the elastic sheet to contact with the conducting sheet again, and the connection between the positive electrode of the battery and the positive electrode output lead of the battery is realized; the nickel-titanium memory alloy used by the invention has the metamorphosis temperature close to the highest safe temperature value of the battery, so that the protection device can protect the battery and can not influence the normal use of the battery.
Drawings
Fig. 1 is a schematic view showing the construction of a battery protection device according to the present invention;
fig. 2 is a schematic structural view of the battery protection device of the present invention when the positive electrode of the battery is short-circuited;
fig. 3 is a schematic structural view of the battery protection device of the present invention when the positive electrode of the battery is connected;
in the figure: 1-shell, 2-memory alloy steel wire, 3-shell fragment, 4-copper sheet, 5-wire, 6-battery, 60-battery positive pole, 7-battery positive pole output wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 2 and fig. 3, a battery protection device includes a housing 1, wherein the housing 1 is made of a heat-conducting insulating material; the inner side of the shell 1 is provided with an arc-shaped metal wire which is a memory alloy made memory alloy steel wire 2; one end of the metal wire is fixedly arranged on the shell 1, the other end of the metal wire is connected with a conductive elastic sheet 3, the elastic sheet 3 is also contacted with a conductive sheet fixedly arranged in the shell 1, and the elastic sheet 3 is electrically connected with the conductive sheet through contact. Two wires 5 are arranged on the outer side of the shell 1, wherein one wire is electrically connected with the conducting strip, and the other wire is electrically connected with the elastic sheet 3.
As shown in fig. 1, 2 and 3, in this embodiment, the memory alloy steel wire 2 may be a nitinol with a transformation temperature of 60 ℃. The memory alloy used in the invention is an alloy material which can completely eliminate the deformation of the memory alloy at a lower temperature after heating and temperature rise and recover the original shape of the memory alloy before deformation, namely the memory alloy has a memory effect.
As shown in fig. 1, the casing 1 is made of heat conductive plastic, and the heat conductive plastic is plastic filled with ceramic powder, and the heat conductive plastic has the advantages of low cost and good heat conductive insulation. In the present embodiment, the housing 1 is a rectangular parallelepiped, and the length, width, and height thereof are preferably 20mm, 10mm, and 3mm, respectively. The protection device with the size has the advantage of small volume, so that the battery protection device can protect the battery 6 in a tiny space without influencing the original volume, structure, performance and the like of the battery 6.
In addition, the conducting strip is a copper sheet 4, and the elastic sheet 3 is also a triangular conducting strip. Wherein the copper sheet 4 is fixed on the inner wall of the shell 1, one corner of the triangular spring piece 3 is contacted with the copper sheet 4, the opposite side is respectively connected with the lead 5 and one end of the memory alloy steel wire 2, wherein the lead 5 is led out of the shell 1, and the other end of the memory alloy steel wire 2 is fixed on the inner wall of the shell 1. The arc bending angle of the memory alloy steel wire 2 can be selected according to actual use, and the memory alloy steel wire can be pulled to contact the elastic sheet 3 with the copper sheet 4 to realize short circuit of the elastic sheet 3 and the copper sheet 4 only when the temperature is lower than the metamorphosis temperature.
As shown in fig. 1, when the battery protection device of the present invention is used, after the heat of the battery is absorbed, the temperature rises to the transformation temperature of the memory alloy, so that the metal wire made of the memory alloy and having an arc shape in the housing 1 is deformed, specifically, the bending angle of the arc shape is reduced. After the bending angle of the metal wire is reduced, the metal wire pulls the elastic sheet 3 at the end part to be separated from the copper sheet 4, so that the two lead wires 5 outside the shell 1 are disconnected; after cooling, the metal wire can restore the arc-shaped bending angle, and the elastic sheet 3 is pulled and then contacts with the copper sheet 4, so that two leads 5 outside the shell 1 are connected, and finally, the short circuit and the use of the battery anode are realized.
As shown in fig. 1, fig. 2 and fig. 3, a battery protection method, which utilizes the above battery protection device to absorb the heat of the battery 6, electrically connects one lead 5 outside the casing 1 of the battery protection device with the battery anode 60, and uses the other lead as the battery anode output lead 7; when the battery 6 heats, the battery protection device absorbs heat and the temperature rises to a certain value, and the battery anode 60 is disconnected with the battery anode output lead 7; when the battery 6 cools, the battery anode 60 is connected to the battery anode output lead 7.
As shown in fig. 2 and 3, in order to better absorb the heat of the battery 6 and to make the sensing more sensitive, the case 1 of the battery protection device is attached to the surface of the battery 6. The lead 5 electrically connected with the elastic sheet 3 is also electrically connected with the battery anode 60, and the lead electrically connected with the copper sheet 4 is used as a battery anode output lead 7; the metal wire is a memory alloy steel wire 2 made of nickel-titanium memory alloy.
The battery protection method of the invention specifically comprises the following steps: when the battery 6 generates heat due to a fault such as a short circuit of an external circuit, the heat on the battery is transferred to the case 1 of the battery protection device, so that the temperature of the case 1 and the inside of the case 1 is increased, and the temperature of the memory alloy steel wire 2 is gradually increased. When the temperature reaches 60 ℃ and the transformation temperature of the nickel-titanium memory alloy is reached, the arc-shaped bending angle of the memory alloy steel wire 2 begins to be reduced, the elastic sheet 3 is driven to be separated from the conducting sheet, the battery anode 60 is disconnected from the battery anode output lead 7, the battery anode 60 is disconnected from the external connection, namely the battery anode 60 is short-circuited in the battery 6; when the temperature is lower than 60 ℃ after cooling, the arc-shaped bending angle of the memory alloy steel wire 2 restores to bring the elastic sheet 3 into contact with the conducting sheet again, so that the connection between the battery anode 60 and the battery anode output lead 7 is realized, and the battery anode 60 is put into use again.
In summary, the battery protection method of the present invention effectively protects the battery 6 by using the battery protection device of the present invention, and avoids risks such as explosion caused by short circuit and heat generation of the battery 6 due to an external circuit; compared with the prior art, the battery is effectively protected; in addition, the invention also has the advantages of low cost, small volume and convenient use, and also has the advantages of sensitive induction and effective protection.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent to the structural improvements of the augmented reality battery protection apparatus and the protection method, made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The battery protection device is characterized by comprising a shell, wherein the shell is made of a heat-conducting and insulating material;
an arc-shaped metal wire is arranged on the inner side of the shell and made of memory alloy; one end of the metal wire is fixedly arranged on the shell, the other end of the metal wire is connected with a conductive elastic sheet, the elastic sheet is also contacted with a conductive sheet fixedly arranged in the shell, and the elastic sheet is electrically connected with the conductive sheet through contact;
two wires are arranged on the outer side of the shell, wherein one wire is electrically connected with the conducting strip, and the other wire is electrically connected with the elastic sheet;
the shell absorbs the heat of the battery by being attached to the surface of the battery, the heat of the battery reaches the deformation temperature of the metal wire, the metal wire drives the elastic sheet to be separated from the conducting sheet, and the elastic sheet is in short circuit with the battery through the corresponding conducting wire to realize protection.
2. The battery protection device of claim 1, wherein the memory alloy is a nickel titanium memory alloy.
3. The battery protection device of claim 1, wherein the housing is made of a thermally conductive plastic, and the thermally conductive plastic is a plastic filled with ceramic powder.
4. The battery protection device of claim 1, wherein the conductive tab is a copper tab secured to an inner wall of the housing.
5. The battery protection device of claim 1, wherein the spring plate is a triangular conductive plate, one corner of the spring plate contacts the conductive plate, and the other corner of the spring plate is connected to the wire and the wire.
6. A battery protection method, wherein the battery protection device of any one of claims 1 to 5 is used to absorb the heat of a battery, and the housing absorbs the heat of the battery by adhering to the surface of the battery; one lead outside the shell of the battery protection device is electrically connected with a battery anode, and the other lead is used as a battery anode output lead;
when the battery heating heat reaches the deformation of the metal wire, the battery anode is disconnected with the battery anode output lead; and when the battery is cooled, the metal wire is recovered to connect the battery anode with the battery anode output lead.
7. The battery protection method of claim 6, wherein the conductive sheet is a copper sheet that is fixedly disposed on an inner wall of the housing;
the lead electrically connected with the elastic sheet is electrically connected with the positive electrode of the battery, and the lead electrically connected with the copper sheet is used as the positive electrode output lead of the battery.
8. The battery protection method according to claim 6, wherein the wire of the battery protection device is made of nitinol; when the temperature of the battery protection device absorbing the heat of the battery is not less than 60 ℃, the arc-shaped bending angle of the metal wire is reduced to drive the elastic sheet to be separated from the conducting sheet, so that the disconnection between the battery anode and the battery anode output lead is realized; when the temperature of the battery protection device is lower than 60 ℃, the arc-shaped bending angle of the metal wire is reduced, and the elastic sheet is driven to be in contact with the conducting strip, so that the connection between the battery anode and the battery anode output lead is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663338.9A CN107516748B (en) | 2017-08-05 | 2017-08-05 | Battery protection device and protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663338.9A CN107516748B (en) | 2017-08-05 | 2017-08-05 | Battery protection device and protection method |
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| Publication Number | Publication Date |
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| CN107516748A CN107516748A (en) | 2017-12-26 |
| CN107516748B true CN107516748B (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710663338.9A Active CN107516748B (en) | 2017-08-05 | 2017-08-05 | Battery protection device and protection method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120557B (en) * | 2018-02-05 | 2021-01-15 | 宁德新能源科技有限公司 | Protection device and battery |
| CN109742279A (en) * | 2018-12-26 | 2019-05-10 | 周芷若 | A kind of new-energy automobile lithium battery charge protection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177835A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Circuit protective element, protective circuit and electrical or electronic equipment |
| CN204720513U (en) * | 2015-06-10 | 2015-10-21 | 惠州市豪鹏科技有限公司 | A kind of cylindrical lithium ion battery |
| CN205428854U (en) * | 2015-12-21 | 2016-08-03 | 上海比亚迪有限公司 | Circuit protection component |
| CN206364305U (en) * | 2016-11-25 | 2017-07-28 | 上海科特新材料股份有限公司 | Data line interface and data wire with Thermal Protection Structural |
-
2017
- 2017-08-05 CN CN201710663338.9A patent/CN107516748B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177835A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Circuit protective element, protective circuit and electrical or electronic equipment |
| CN204720513U (en) * | 2015-06-10 | 2015-10-21 | 惠州市豪鹏科技有限公司 | A kind of cylindrical lithium ion battery |
| CN205428854U (en) * | 2015-12-21 | 2016-08-03 | 上海比亚迪有限公司 | Circuit protection component |
| CN206364305U (en) * | 2016-11-25 | 2017-07-28 | 上海科特新材料股份有限公司 | Data line interface and data wire with Thermal Protection Structural |
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| CN107516748A (en) | 2017-12-26 |
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