CN203119024U - External overcurrent protection device for lithium battery - Google Patents
External overcurrent protection device for lithium battery Download PDFInfo
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- CN203119024U CN203119024U CN2013201036478U CN201320103647U CN203119024U CN 203119024 U CN203119024 U CN 203119024U CN 2013201036478 U CN2013201036478 U CN 2013201036478U CN 201320103647 U CN201320103647 U CN 201320103647U CN 203119024 U CN203119024 U CN 203119024U
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- lithium battery
- electrode
- flexible fusible
- fusible electrode
- lithium
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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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Abstract
The utility model provides an external overcurrent protection device for a lithium battery. The device comprises a lithium battery body; at least one electrode end part of the lithium battery body is provided with a flexible fusible electrode; the flexible fusible electrode comprises a fixed part and a fusible part; and the flexible fusible electrode is fixedly connected with the lithium battery body through the fixed part. The utility model provides a mechanical protection device for the lithium battery (lithium battery pack); by welding the flexible fusible electrode on at least one electrode end part of the lithium battery, when the working current exceeds the maximum carry current of the flexible fusible electrode, the fusible part can be melted instantaneously, so that the situation that a huge quantity of heat is generated in the lithium battery or causes the lithium battery to explore is avoided, and the safety performances of the lithium battery and facilities using the lithium battery are ensured; and the connection between the lithium batter and other lithium batteries in a lithium battery pack is cut off, so that the functions of other lithium batteries are not influenced.
Description
Technical field
The utility model relates to a kind of lithium battery, is specifically related to the protective device of the outside overcurrent of a kind of lithium battery.
Background technology
Because little, the noiselessness of lithium battery environmental pollution, energy advantages of higher now are widely used in fields such as mobile phone, notebook computer, automobile.Especially in recent years as a kind of new forms of energy, the electric automobile paid close attention to of people extremely, its groundwork principle was to provide electric energy by lithium battery to motor, the drive motor running, thus propelling vehicle advances.Power set as electric automobile are by a plurality of single lithium battery series and parallels, form high-power, jumbo lithium battery group.
If lithium battery external short circuit, internal short-circuit and overcharging etc. all can difficulty blast the lithium battery core, the person, economic asset etc. all there is certain injury.When being lower than 2.4V as be higher than 4.2V or lithium cell discharge voltage when lithium battery core charging voltage, can allowing battery capacity produce nonvolatil decline, and both positive and negative polarity is short-circuited, thereby cause lithium battery to blast.Also have when the electric current of lithium battery is excessive, lithium ion has little time to enter memory location, can be gathered in material surface, and lithium battery is blasted.The short circuit of lithium battery outside refers to caused short circuits such as the design of the excessive or battery pack built-in electrical insulation of the foreign current of electric core is bad, when electric core outside is short-circuited, when electronic building brick is failed cut-off loop again, electricity in-core portion can produce high heat, cause part electrolyte vaporization, li battery shell is burst and exploded.In particular as the lithium battery group of the automobile power energy, in case after some lithium batteries are blasted, can guide coupled lithium battery to blast in succession owing to the diffusion of heat, have not only had a strong impact on travelling of vehicle, also bring potential safety hazard.Though at present overcharging of lithium battery all designed flexible fusible electrode with the internal short-circuit situation with charger avoids lithium battery to blast, caused the situation that short circuit is exploded still to exist for the outside overcurrent of lithium battery.
Generally be parameters such as the voltage by software monitoring and control lithium battery, electric current when its work to the protection of battery pack at present.If but the time marquis of software failure, then all lithium batteries just are in state out of control, do not have a kind of when effectively avoiding the lithium battery external short circuit to its means of protecting, happen occasionally so the phenomenon of lithium battery blast is still.
The utility model content
The purpose of this utility model just provides the protective device of the outside overcurrent of a kind of lithium battery, avoids lithium battery to cause inside battery to produce huge heat and explosion phenomenon because electric current is excessive.
In order to reach above-mentioned effect; the utility model provides the protective device of the outside overcurrent of a kind of lithium battery; comprise the lithium battery body; at least one electrode tip of described lithium battery body is installed with flexible fusible electrode; described flexible fusible electrode by fixed part with form from fusing portion, described flexible fusible electrode is fixedlyed connected with electrode by fixed part.
The preferred version of such scheme is that the material of described flexible fusible electrode is preferably aluminum slice, but its material is not limited to aluminium again, as nickel etc.; The thickness of described aluminum slice is 0.1-1mm.
When this device is used for battery pack protected, a plurality of flexible fusible electrodes can be connected into a baffle, the upper surface of described baffle is welded with collector plate, and the position with respect to flexible fusible electrode on the described collector plate is provided with the hole.Collector plate is as the large power, electrically circulation road of battery pack.
In order to protect the fail safe of lithium battery body; described flexible fusible electrode overcurrent protection threshold values is according to the different lithium battery behavior and the different application of the lithium battery group in groups requires to determine; generally speaking, the overcurrent protection threshold values of described flexible fusible electrode be lithium battery body discharge-rate 5-20 doubly.The design guarantees under the specific currents scope normal current-carrying, surpasses then fusible of specific currents scope, thereby has protected the lithium battery body to be without prejudice or explode.
Described flexible fusible electrode is fixing by the electrode welding of fixed part and lithium battery body.
The shape of the flexible fusible electrode in the utility model without limits, its size suitable with battery electrode, its shape can be helical form, U-shaped shape, L type etc., wherein helical form, U-shaped shape are best, the mechanical stress in the time of can eliminating work.The fixed part of flexible fusible electrode satisfies should not rupture when being welded on the electrode of lithium cell and gets final product with reliability; be to utilize the fusing point of material low from fusing portion; when surpassing the maximum current-carrying of its design, can fuse moment, serve as the fuse effect, thereby protected the lithium battery body to be without prejudice.
The electric current of maximum is that 20A is when following when this protective device is applied in work; fixed part on the flexible fusible electrode of aluminium material is welded on the negative or positive electrode of lithium battery body, also can on positive and negative the two poles of the earth of lithium battery body, all welds flexible fusible electrode.During work, electric current is transferred to by flexible fusible electrode and needs on the electric equipment.When its operating current surpassed the maximum current-carrying of flexible fusible electrode design, it had avoided lithium battery to produce the situation that external short circuit causes the lithium battery blast because of overcurrent from the moment fusing of fusing portion, has protected lithium battery and has used device '.
When the load current of maximum surpasses the situation of 20A when this protective device is applied in work; when namely using the lithium battery group to power; the baffle that a plurality of flexible fusible electrodes are connected into is welded on the collector plate earlier; soldering member with collector plate and baffle is installed on the battery pack again; and the fixed part on each flexible fusible electrode is welded to any one electrode on each corresponding lithium battery monomer, also can be installed on positive and negative the two poles of the earth.During work; when if the electric current by some flexible fusible electrodes surpasses the maximum current-carrying of its design; certainly the fusing portion of flexible fusible electrode can fuse moment; thereby protect this single lithium battery to avoid the generation of its blast situation; and cut off the contact between other lithium batteries in the battery pack, do not influence the work of other lithium batteries.
The utlity model has following beneficial effect:
1, the utility model provides a kind of mechanical protective device to lithium battery (group), by welding flexible fusible electrode at its electrode, and the coefficient of safety when having protected lithium battery work.
2, when single lithium battery is protected; when as long as operating current surpasses the maximum current-carrying of flexible fusible electrode design; it is from the moment fusing of fusing portion; avoided lithium battery to produce the situation that external short circuit causes the lithium battery blast because of overcurrent, protected lithium battery and used device '.
3, when the lithium battery group is protected; the baffle that a plurality of flexible fusible electrodes are connected into is welded on the collector plate earlier; again the fixed part on each flexible fusible electrode is welded on the electrode on each corresponding lithium battery monomer; when if the electric current by some flexible fusible electrodes surpasses the maximum current-carrying of its design; certainly the fusing portion of flexible fusible electrode can fuse moment; thereby protect this single lithium battery to avoid the generation of its blast situation; and cut off the contact between other lithium batteries in the battery pack, do not influence the work of other lithium batteries.
4, flexible fusible electrode of the present utility model can be eliminated the stress that adds man-hour, improves its useful life.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is first kind of structural representation of flexible fusible electrode;
Fig. 2 is second kind of structural representation of flexible fusible electrode;
Fig. 3 is the structural representation of baffle;
Fig. 4 is the structural representation of collector plate;
Fig. 5 is the soldering member schematic diagram of the utility model baffle and collector plate;
Fig. 6 is that the utility model is installed in the structural representation on the lithium battery group;
Among the figure: the flexible fusible electrode of 1-, 11-fixed part, 12-be from fusing portion, 2-baffle, 3-collector plate, 4-hole, 5-lithium electricity body body.
Embodiment
Be first kind of structural representation of flexible fusible electrode as shown in Figure 1, flexible fusible electrode 1 is shape in the shape of a spiral, by fixed part 11 with form from fusing portion 12; The material of described flexible fusible electrode 1 is aluminum slice, and the thickness of described aluminum slice is 0.1mm, and the overcurrent protection threshold values of flexible fusible electrode 1 is 5-20 times of lithium battery body discharge-rate.
Be second kind of structural representation of flexible fusible electrode as shown in Figure 2; flexible fusible electrode 1 is U-shaped shape; by fixed part 11 with form from fusing portion 12; the material of described flexible fusible electrode 1 is aluminum slice; the thickness of described aluminum slice is 1mm, and the overcurrent protection threshold values of flexible fusible electrode 1 is 5-20 times of lithium battery body discharge-rate.
Be the structural representation of baffle as shown in Figure 3, baffle 2 is to connect into an integral body by a plurality of flexible fusible electrodes 1, and flexible fusible electrode 1 is shape in the shape of a spiral, by fixed part 11 with form from fusing portion 12.
Be the structural representation of collector plate as shown in Figure 4, the position with respect to flexible fusible electrode on the collector plate 3 is provided with hole 4.
Be baffle and collector plate soldering member schematic diagram as shown in Figure 5; connect into an integral body by a plurality of flexible fusible electrodes 1 and form baffle 2; the upper surface of baffle 2 is welded with collector plate 3; position with respect to flexible fusible electrode 1 on the described collector plate 3 is provided with hole 4, and collector plate 3 is as the large power, electrically circulation road of battery pack.
Be that the utility model is installed in the structural representation on the lithium battery group as shown in Figure 6, the battery pack that lithium battery body 5 is formed.Be welded with the large power, electrically circulation road collector plate 3 as battery pack in the upper surface that a plurality of flexible fusible electrodes 1 connect into a baffle 2, the position with respect to flexible fusible electrode 1 on the described collector plate 3 is provided with hole 4.Earlier baffle 2 is welded on the collector plate 3; again the soldering member of collector plate 3 with baffle 2 is installed on the battery pack; and the fixed part on each flexible fusible electrode 1 is welded to any one electrode on each corresponding lithium battery monomer, also can be installed on positive and negative the two poles of the earth.The maximum current-carrying of described flexible fusible electrode 1 is 5-20 times (5C-20C) of battery body discharge-rate; When on the electric current that passes through can moment fusing when surpassing the maximum current-carrying of its design, served as the fuse effect, thereby protected the lithium battery body to be without prejudice or explode.
Above embodiment is not limited only to protection range of the present utility model, all make amendment based on basic thought of the present utility model or change all belong to protection range of the present utility model.
Claims (5)
1. the protective device of the outside overcurrent of a lithium battery; comprise the lithium battery body; it is characterized in that: at least one electrode tip of described lithium battery body is welded with flexible fusible electrode; described flexible fusible electrode by fixed part with form from fusing portion, described flexible fusible electrode is fixedlyed connected with battery by fixed part.
2. the protective device of the outside overcurrent of a kind of lithium battery according to claim 1, it is characterized in that: the material of described flexible fusible electrode is aluminum slice, the thickness of described aluminum slice is 0.1-1mm.
3. the protective device of the outside overcurrent of a kind of lithium battery according to claim 1; it is characterized in that: a plurality of flexible fusible electrodes connect into baffle; the upper surface of described baffle is welded with collector plate, is provided with the hole with respect to flexible fusible electrode position on the described collector plate.
4. the protective device of the outside overcurrent of a kind of lithium battery according to claim 1 is characterized in that: the overcurrent protection threshold values of described flexible fusible electrode be lithium battery body discharge-rate 5-20 doubly.
5. the protective device of the outside overcurrent of a kind of lithium battery according to claim 1, it is characterized in that: described flexible fusible electrode is fixed by the electrode welding of fixed part and lithium battery body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201036478U CN203119024U (en) | 2013-03-07 | 2013-03-07 | External overcurrent protection device for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201036478U CN203119024U (en) | 2013-03-07 | 2013-03-07 | External overcurrent protection device for lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203119024U true CN203119024U (en) | 2013-08-07 |
Family
ID=48899343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201036478U Expired - Lifetime CN203119024U (en) | 2013-03-07 | 2013-03-07 | External overcurrent protection device for lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203119024U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178236A (en) * | 2013-03-07 | 2013-06-26 | 华霆（合肥）动力技术有限公司 | Lithium battery external over-current protection device |
| CN107195842A (en) * | 2017-06-09 | 2017-09-22 | 深圳市朗能动力技术有限公司 | Battery pole ear and battery modules |
-
2013
- 2013-03-07 CN CN2013201036478U patent/CN203119024U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178236A (en) * | 2013-03-07 | 2013-06-26 | 华霆（合肥）动力技术有限公司 | Lithium battery external over-current protection device |
| CN107195842A (en) * | 2017-06-09 | 2017-09-22 | 深圳市朗能动力技术有限公司 | Battery pole ear and battery modules |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 230601 Anhui city in Hefei Province, the economic and Technological Development Zone No. 62 battery factory Patentee after: Huating (Hefei) Power Technology Co.,Ltd. Address before: 230601 Xi Lu Li Heng Industrial Square, A-2 west of Hefei City, Anhui Patentee before: Huating (Hefei) Power Technology Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |
|
| CX01 | Expiry of patent term |