CN2916936Y

CN2916936Y - Dilation-proof battery

Info

Publication number: CN2916936Y
Application number: CNU2006200138614U
Authority: CN
Inventors: 李来锁
Original assignee: SHENZHENTOPWAY ELECTRICAL APPLIANCE CO Ltd
Current assignee: SHENZHENTOPWAY ELECTRICAL APPLIANCE CO Ltd
Priority date: 2006-05-15
Filing date: 2006-05-15
Publication date: 2007-06-27
Anticipated expiration: 2016-05-15

Abstract

The utility model relates to an anti-expansion battery, which comprises a shell body and a battery core and a PCB groupware positioned inside the shell body. A thin film switch is arranged closely next to the battery core inside the shell body; the thin film switch is positioned in the charging and discharging circuit on the PCB groupware. The thin film switch is composed of an upper film, a lower film and an isolation layer in between the upper and lower films and the three one altogether form a film shape; an electric pin extending from the upper and lower films is connected to the corresponding wiring end on the PCB groupware. The upper and lower films are configured with conductive carbon films. The shell body is composed of a bottom shell and a surface cap that buckles with each other. In the utility model, when the battery core expands to certain extent, the thin film switch will function can cut off corresponding charging and discharging circuit, so as to prevent over expansion of the battery core; when the battery core resumes the normative shape, the thin firm switch will break and the battery can be charged and discharge normally, so as to ensure the service life of the battery, prevent explosion and avoid the waste resulted from the directly discarded battery.

Description

Anti-expansion battery

Technical field

The utility model relates to a kind of battery, is meant a kind of anti-expansion battery especially.

Background technology

Various rechargeable batteries (as lithium battery) are used widely, and these batteries are taking place can to cause expansion under the situations such as damaged leakage, super-charge super-discharge, high temperature, use the battery that expands easily to cause security incidents such as burning, blast as continuing.For this reason, existing rechargeable battery all can be provided with anti-structure or the device that expands, as Chinese utility model patent ZL200420045599.2 number disclosed a kind of safety-type flexible-packed battery, comprise a flexible-packed battery entity, twine a safety belt on it, this safety belt is provided with an electric conductor that can rupture under the tension force effect, and electric conductor is connected in the charge-discharge circuit of battery entity.The main body of safety belt is a soft plastic band, and electric conductor is fixed on the soft plastic band.This flexible-packed battery is by twining a safety belt, the electric conductor that is connected and can ruptures under the tension force effect with the inside battery circuit is being set on the safety belt, the tension force that makes battery be produced when expanding forms crackle or disconnection with safety belt, thereby electric conductor is ruptured thereupon, cause battery circuit to disconnect and the mechanical cutting charge-discharge circuit, the termination battery uses, and eliminates the danger of battery burning, blast.Yet this mode makes battery also scrap thereupon, can't re-use, and has caused huge waste.

The utility model content

Technical problem to be solved in the utility model is: a kind of anti-expansion battery is provided, and it can effectively prevent cell expansion, thereby avoids various battery performances, the safety problem brought because of cell expansion.

For solving the problems of the technologies described above, the utility model adopts following technical scheme: a kind of anti-expansion battery is provided, comprise housing, be installed in the electric core and the PCB assembly of enclosure interior, described enclosure interior is close to electric core and is equiped with a thin film switch, and described thin film switch is arranged in the charge-discharge circuit on the PCB assembly.

Further improvement in the technical proposal is: described thin film switch comprise film, down film and be located at film with following film between separator, the three fits into film like, and go up film reach under film respectively stretch out one and connect on electric pin and the PCB assembly accordingly that terminals link to each other.

Further improvement in the technical proposal is: described upward film, following film are respectively conductive carbon film.

Further improvement in the technical proposal is: described housing comprises drain pan, the cover of mutual fastening.

The beneficial effects of the utility model are: the utility model is when electric core expand into when a certain amount of; thin film switch works and disconnects corresponding charge-discharge circuit; avoided electric core excessive expansion; and after electric core returns to normal appearance; thin film switch can disconnect again; battery can normally discharge and recharge again, thereby reaches the useful life of protection battery and the danger of stopping to explode, the waste of also having avoided direct waste battery to cause.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Description of drawings

Fig. 1 is the decomposing state schematic diagram of the anti-expansion battery of the utility model.

Fig. 2 is the thin film switch schematic diagram of the anti-expansion battery of the utility model.

Fig. 3 a～Fig. 3 d is the structural representation of each assembly of thin film switch.

Fig. 4 is the assembled state outside drawing of the anti-expansion battery of the utility model.

Embodiment

As shown in Figure 1, the utility model provides a kind of anti-expansion battery, comprises housing 1, is installed in electric core 2, PCB assembly 3 and the thin film switch 4 of housing 1 inside.

Wherein, described housing 1 comprises drain pan 11, cover 12, and drain pan 11 can fasten mutually with cover 12 and form complete battery profile, as shown in Figure 4.

Described electric core 2 is an energy storage unit, and 3 of described PCB assemblies link to each other and are provided with outside power connection end with electric core 2 and link to each other with power consumption equipment.Both structures all electric core 2, the PCB assembly 3 with existing battery are identical, seldom give unnecessary details at this.

Shown in Fig. 2 and Fig. 3 a～Fig. 3 c, described thin film switch 4 comprise film 41, down film 42 and be located at film 41 and following film 42 between separator 43.Last film 41, following film 42 are generally the carbon film of conduction, also are provided with some isolation blow points 410 on last film 41 surfaces, isolate the distribution situation of blow point 410 on last film 41 shown in Fig. 3 d.Last film 41, down film 42 and separator 42 utilize glue to fit into film like, and go up film 41 and down film 42 also respectively stretch out one and connect electric pin 411,421 and link to each other with corresponding terminals on the PCB assembly 3.

When battery in use, particularly during boost charge, electricity core 2 very easily expands, 2 in the electric core that expands can be exerted pressure to being close to the thin film switch 4 of being located at electric core 2 surfaces, when electric core 2 expand into when a certain amount of, applied pressure is enough to cause the last film 41 and following film 42 conductings of thin film switch 4, promptly can disconnect corresponding charge-discharge circuit, battery suspends use (can't discharge and recharge), has also avoided electric core 2 to continue excessive expansions; After electric core 2 recovered normal appearance again, 4 of thin film switches were not subjected to the external force effect, its down film 41 be in off-state again with following film 42, charge-discharge circuit then again can operate as normal, battery promptly can carry out charge or discharge.Thereby reach the useful life and the danger of stopping to burn, explode, the waste of also having avoided direct waste battery to cause of protection battery.

Claims

1, a kind of anti-expansion battery comprises housing, is installed in the electric core and the PCB assembly of enclosure interior, and it is characterized in that: described enclosure interior is close to electric core and is equiped with a thin film switch, and described thin film switch is arranged in the charge-discharge circuit on the PCB assembly.

2, anti-expansion battery as claimed in claim 1, it is characterized in that: described thin film switch comprise film, down film and be located at film and following film between separator, the three fits into film like, and go up film and down film respectively stretch out one and connect electric pin and link to each other with corresponding terminals on the PCB assembly.

3, anti-expansion battery as claimed in claim 2 is characterized in that: described upward film, following film are respectively conductive carbon film.

4, anti-expansion battery as claimed in claim 1 or 2, it is characterized in that: described housing comprises drain pan, the cover of mutual fastening.