CN102738435A - Improved battery, nested battery and remote controller - Google Patents

Improved battery, nested battery and remote controller Download PDF

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Publication number
CN102738435A
CN102738435A CN2011100911487A CN201110091148A CN102738435A CN 102738435 A CN102738435 A CN 102738435A CN 2011100911487 A CN2011100911487 A CN 2011100911487A CN 201110091148 A CN201110091148 A CN 201110091148A CN 102738435 A CN102738435 A CN 102738435A
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CN
China
Prior art keywords
battery
improved
output
circuit
discharge protection
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Application number
CN2011100911487A
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Chinese (zh)
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CN102738435B (en
Inventor
胡建坤
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胡建坤
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Priority to CN201110091148.7A priority Critical patent/CN102738435B/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses an improved battery, which comprises: a battery body, an output positive electrode, an output negative electrode, and a discharge protection circuit. The battery body is in electric connection with the discharge protection circuit, which controls the output of the battery body through the output positive electrode and the output negative electrode. The invention also provides a nested battery using the improved battery and a remote controller. By means of discharge protection and a voltage stabilizing circuit, battery stabilized voltage output can be effectively controlled, battery overdischarge can be prevented, and the circuit design of an electronic product employing the improved battery of the invention can be simplified.

Description

A kind of improved battery, nested battery and a kind of remote controller
Technical field
The present invention relates to the battery technology field, relate in particular to a kind of improved battery, nested battery and a kind of remote controller.
Background technology
At present, No. 5 AA and No. 7 AAA standard cells are widely used in various electronic products, have brought facility for people use electronic product.Different by serviceability, standard cell comprises disposable dry cell (like Zn-Mg battery) and rechargeable battery (like Ni-MH battery).Low power consumption electrical equipment such as remote controller, clock and watch, universal instrument, broadcast receiver, major part is used the little disposable dry cell of self-discharge rate, generally can use not have till the electricity, and the phenomenon of leakage also can appear in some dry cell, corrosion cell contact terminal and wiring board.Disposable dry cell abandons and also is prone to contaminated environment.
Chargeable Ni-MH battery because of self-discharge rate is high, generally is used in the big power consumption electrical equipment, as is used in the low power consumption electrical equipment, and service time is longer, and like remote controller, then self discharge power consumption is far longer than the use power consumption, and waste is serious.And the little chargeable lithium cell of self-discharge rate has that volume is little, the charge and discharge cycles number of times is high, pollution-free, the advantage of memory-less effect, descends but its voltage in use is approximately linear, and generally requires to have voltage stabilizing circuit.But do not have the designing voltage regulator circuit in most of low power consumption electrical equipment, thereby chargeable lithium cell is used in inconvenience.And for rechargeable battery, charge protection and discharge prevention are particularly important, overcharge all can cause damage to rechargeable battery with overdischarge, influence the life-span of rechargeable battery.
In addition, above-mentioned battery voltage is in use all descending, and is not voltage stabilizing output.Therefore, uses their electronic device, all will consider this factor of wide voltage power supply, but after voltage descended, signal output also died down thereupon, as the distance of remote controller effect reduce, wireless sound diminishes etc.If over-discharge can, the battery that has also the phenomenon of leakage can occur, corrosion cell contact terminal and wiring board.
With respect to low power consumption electrical equipment such as remote controller, clock and watch, broadcast receivers, the disposable used for dry cell of its use can be dropped after not having electricity, is prone to cause environmental pollution.Though the chargeable battery of employing is also arranged at present, need special charger, it is very inconvenient that the user is used.
For the remote controller that uses disposable dry cell, be to add that by a circuit board battery, shell and button constitute as the one of which.But thicker and heavy owing to the relative circuit board of disposable dry cell, be matching battery, the battery case on the low power consumption electrical equipment such as remote controller is designed to be thick and heavy relatively.
Summary of the invention
A purpose of the embodiment of the invention is, a kind of improved battery is provided, and puts into electronic product extensiblely and uses; Be designed with discharge prevention in this battery; Effectively the output of control battery prevents battery over-discharge, simplifies the circuit design of the electronic product that uses this battery; Reduce cost, economize on resources.
Time purpose of the embodiment of the invention is, a kind of improved battery is provided, and is designed with voltage stabilizing circuit in this battery, effectively controls battery voltage stabilizing output, uses the electronic device of this battery more stably to work.
A purpose again of the embodiment of the invention is, a kind of improved battery is provided, and this battery body is chargeable, the environmental pollution of avoiding disposable battery to be dropped causing.
The another purpose of the embodiment of the invention is, a kind of improved battery is provided, and this battery body is chargeable, has charging inlet and charging circuit, can prevent to overcharge, the convenient use.
Another purpose of the embodiment of the invention is, a kind of nested battery is provided, and can in control battery voltage stabilizing output, directly substitute existing general dry cell.
Another purpose of the embodiment of the invention is, a kind of remote controller is provided, and himself is not designed with voltage stabilizing circuit, use be aforementioned improved type lithium battery, it is all little a lot of on volume and weight to compare existing remote controller.
For realizing above-mentioned purpose, the embodiment of the invention provides a kind of improved battery, comprises battery body, output cathode, output negative pole, discharge protection circuit; Said battery body is electrically connected with said discharge protection circuit, and said discharge protection circuit is controlled said battery body through said output cathode and output negative pole output.
Improved battery also comprises voltage stabilizing circuit among a kind of embodiment; Said discharge protection circuit and voltage stabilizing circuit are electrically connected; Said battery body is exported behind said discharge protection circuit and said voltage stabilizing circuit.
Among a kind of embodiment, said battery body is a lithium battery.
Among a kind of embodiment, said battery body is chargeable, and said battery also comprises: charging inlet and charging circuit, and said charging inlet is electrically connected with said charging circuit, and said charging circuit is electrically connected with said battery body.
Said charging inlet is a USB interface, and the electric energy input of charging is provided for said battery.
Correspondingly; The embodiment of the invention provides a kind of nested battery; Comprise housing, be arranged on positive pole and negative pole on the said housing, be placed on the improved battery of at least one the foregoing description of said enclosure interior, positive pole on the said housing and negative pole are connected respectively to the output cathode and the output negative pole of said improved battery.
The embodiment of the invention also provides a kind of nested battery; Comprise: housing, be arranged on positive pole and negative pole on the said housing, be placed on the improved battery of at least one the foregoing description of said enclosure interior; Positive pole on the said housing and negative pole are connected respectively to the output cathode and the output negative pole of said improved battery, also are provided with on the said housing and the corresponding interface of the charging inlet of said improved battery.
In addition, the embodiment of the invention also provides a kind of remote controller, comprises battery, said battery adopt as above-mentioned each embodiment in battery.
The invention has the beneficial effects as follows:
(1) improved battery embodiment of the present invention controls battery output effectively through discharge protection circuit, prevents battery over-discharge and reduces useful life;
(2) adopt voltage stabilizing circuit in an embodiment of the present invention, control battery voltage stabilizing output effectively, make that the electronic product work of this battery of use is more stable, simplify the circuit design of the electronic device that uses this battery; Further, when battery body when being chargeable, battery has charging circuit and charging inlet, and the protection rechargeable battery charges normal, and prevents battery overcharge and reduces useful life, the environmental pollution of also avoiding disposable battery to be dropped causing;
(3) the nested battery embodiment of the present invention is provided with battery case simultaneously through using improved battery, can directly replace the use of most of dry cell, and battery can be exported in voltage stabilizing;
(4) small-power electrical equipment such as remote controller is through using improved battery, and electrical equipment itself need not to design discharge protection circuit and voltage stabilizing circuit, thereby the circuit design of electrical equipment is able to simplify, and reduces cost, economizes on resources.When battery body was the low capacity chargeable lithium cell, small-power electrical equipment such as remote controller also can correspondingly reduce its volume and weight.
Description of drawings
Fig. 1 is the structural representation of first kind of embodiment of improved battery of the present invention;
Fig. 2 is the structural representation of second kind of embodiment of improved battery of the present invention;
Fig. 3 is the structural representation of the third embodiment of improved battery of the present invention;
Fig. 4 is a kind of circuit theory diagrams embodiment illustrated in fig. 3;
Fig. 5 is the sketch map of the nested battery embodiment of the present invention.
Embodiment
Combine accompanying drawing that the present invention is done further explain through embodiment below.
As shown in Figure 1, first kind of improved battery embodiment comprises: battery body 11, discharge protection circuit 12, lead-out terminal; Said discharge protection circuit 12 is electrically connected with battery body 11, and control battery body 11 is through the output cathode and the output negative pole output of lead-out terminal.Discharge protection circuit 12 is used to protect the battery can overdischarge, and the voltage that detects battery body 11 when discharge protection circuit 12 turn-offs output, thereby prevents that battery from suffering damage because of overdischarge during to battery discharge protection voltage.
As shown in Figure 2, among second kind of improved battery embodiment, except comprising structure as shown in Figure 1, promptly battery body 21, discharge protection circuit 22 also comprise: voltage stabilizing circuit 23; Voltage stabilizing circuit 23 protection battery output burning voltages, voltage stabilizing circuit 23 can be a decompression voltage regulator, also can be voltage boosting and stabilizing circuit.Among another embodiment, battery body 11 is a lithium battery.
As shown in Figure 3; Among the third improved battery embodiment, except comprising structure as shown in Figure 2, promptly outside battery body 31, discharge protection circuit 32, the voltage stabilizing circuit 33; Also comprise: charging inlet 34 and charging circuit 35; Wherein, charging inlet 34 is electrically connected with charging circuit 35, and charging circuit 35 is electrically connected with battery body 31.Be appreciated that this moment, battery body 31 was rechargeable battery.This embodiment combines charging circuit and discharge protection circuit, makes it abundant use, thereby can prolong battery useful life, and the versatility of intensified charging battery improves the utilization rate of battery.Though have in the prior art charging circuit and discharge protection circuit are designed in electrical equipment; But can increase the manufacturing cost of electrical equipment like this; And utilization rate is low, after electrical equipment reaches its life cycle, although charging circuit and discharge protection circuit are also intact; But also can only be dropped, cause the wasting of resources and environmental pollution with electrical equipment.And the improved battery of employing present embodiment; Put into electrical equipment extensiblely and use, after electrical equipment reaches its life cycle, when battery and charging circuit and discharge protection circuit are also intact; Other electrical equipment be can be re-used in, thereby the wasting of resources and environmental pollution avoided.Among a kind of embodiment, charging inlet 34 is a USB interface, and the electric energy input of charging is provided for this improved battery.This charging inlet can also be the interface of other types among other embodiment, like column type interface, PS2 interface etc., as long as the interface of the adaptive external power supply of ability.
Among another improved battery embodiment, battery body is a chargeable lithium cell, and its self-discharge rate is little, and charging and discharging cycle life can have more than 500 times, has greatly improved the useful life of battery.
Fig. 4 shows a kind of circuit theory diagrams embodiment illustrated in fig. 3, and discharge protection circuit 42 is made up of voltage detecting IC2, R2 and FET Q2, and wherein, FET Q2 is as electronic switch.The voltage that detects battery body 41 as voltage detecting IC2 is during greater than battery discharge protection voltage, FET Q2 conducting, normal output; When the voltage of battery body 41 during less than battery discharge protection voltage, not conducting of FET Q2, thereby the protection battery prevents that battery from suffering damage because of overdischarge; Voltage stabilizing circuit 43 guarantees the output burning voltage; When battery is protected when not exporting, can connect external power supplys by charging inlet 44 be battery body 41 chargings through charging circuit 45, and assurance can not overcharged.When the battery body of this embodiment adopts chargeable lithium cell; Can give full play to the effect of each chargeable lithium cell, easy to use, thus improve its utilance and utilization rate; Reduce the use amount of dry cell and standard charging battery, economize on resources and reduce environmental pollution.At this moment, the chip IC of using in the charging circuit 45 1 is the lithium cell charging chip, and the IC2 in the discharge protection circuit 42 is for being voltage checking chip, and the chip IC 3 that adopts in the voltage stabilizing circuit 43 is a voltage-dropping type voltage stabilizing chip.
Among the another kind of embodiment, can related chip IC 1, IC2, IC3 and electronic switch (being FET Q2 shown in Figure 3) be integrated, can adopt existing integrated technique to realize.
As shown in Figure 5; A kind of embodiment of the nested battery of the present invention comprises improved battery 59 and the housing 56 that previous embodiment provides, and its middle shell 56 is provided with respectively the positive pole 57 and negative pole 58 that output cathode and output negative pole with improved battery 59 are coupled.The another kind of embodiment of the nested battery of the present invention comprises improved battery and the housing that aforementioned the third embodiment provides; Wherein, The positive pole and negative pole that is coupled except output cathode and the output negative pole that is provided with respectively with improved battery on the housing, also be provided with and the corresponding interface of the charging inlet of improved battery.This interface is exactly the charging inlet of improved battery among a kind of embodiment.
No matter be above-mentioned which kind of nested battery embodiment, its housing can be set to corresponding specification according to the battery specification requirement of matching used battery product; For example; According to the battery specification of electronic devices such as remote controller, clock and watch, universal instrument, broadcast receiver, housing 56 is set is corresponding size and mode of appearance, as be designed to cylindrical; So that supporting with corresponding electronic device, it is inner to be able to put into the electronic device that matches.The housing 56 that will have nested battery among a kind of embodiment is made into the shape of standard cell commonly used, thus directly replace most dry cells with common rechargeable battery so that in different electrical equipment, use, improve its utilance; Can also simplify simultaneously the circuit of the electronic device that uses this battery.Among another embodiment, the housing 56 that will have nested battery is made into the shape corresponding to two joint dry cells, thereby can directly replace two joint dry cells.Certainly, those skilled in the art can use in electronic device with adaptive this nested battery with electrode shape through regulating electrode position.
The embodiment of the invention provides a kind of remote controller, and its basic structure with existing remote controller is identical, but employed battery is aforementioned improved type battery or nested battery, and improved battery or nested battery are put into remote controller extensiblely.As well known to those skilled in the art; The profile of remote controller and weight are influenced by battery, the general cylindrical stem battery that uses in the existing remote controller, and this makes that the profile of remote controller is thicker relatively and weight is heavier relatively; In the embodiment of the invention; If when the battery body of improved battery was the low capacity lithium battery, it is thinner relatively that the profile of remote controller can be designed, its weight is also correspondingly lighter simultaneously.
Be appreciated that improved battery or nested battery that the embodiment of the invention provides also can be used for other small-power electrical equipment except that remote controller, like clock and watch, universal instrument, broadcast receiver etc.
Above content is to combine concrete execution mode to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.

Claims (8)

1. an improved battery comprises battery body, output cathode, output negative pole, it is characterized in that, comprising: discharge protection circuit; Said battery body is electrically connected with said discharge protection circuit, and said discharge protection circuit is controlled said battery body through said output cathode and output negative pole output.
2. improved battery as claimed in claim 1 is characterized in that, comprising: voltage stabilizing circuit; Said discharge protection circuit and voltage stabilizing circuit are electrically connected; Said battery body is exported behind said discharge protection circuit and said voltage stabilizing circuit.
3. according to claim 1 or claim 2 improved battery, it is characterized in that: said battery body is a lithium battery.
4. like each described improved battery of claim 1-3; It is characterized in that said battery body is chargeable, said improved battery also comprises: charging inlet and charging circuit; Said charging inlet is electrically connected with said charging circuit, and said charging circuit is electrically connected with said battery body.
5. improved battery as claimed in claim 4 is characterized in that, said charging inlet is a USB interface, and the electric energy input of charging is provided for said battery.
6. nested battery; It is characterized in that; Comprise: housing, be arranged on positive pole and negative pole on the said housing, be placed on said enclosure interior at least one like each described improved battery of claim 1-5, positive pole on the said housing and negative pole are connected respectively to the output cathode and the output negative pole of said improved battery.
7. nested battery; It is characterized in that; Comprise: housing, be arranged on positive pole and negative pole on the said housing, be placed on said enclosure interior at least one like claim 4 or 5 described improved battery; Positive pole on the said housing and negative pole are connected respectively to the output cathode and the output negative pole of said improved battery, also are provided with on the said housing and the corresponding interface of the charging inlet of said improved battery.
8. a remote controller comprises battery, it is characterized in that: said battery adopts like each described battery of claim 1-7.
CN201110091148.7A 2011-04-12 2011-04-12 A kind of improved battery, nested battery and a kind of remote controller Expired - Fee Related CN102738435B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110091148.7A CN102738435B (en) 2011-04-12 2011-04-12 A kind of improved battery, nested battery and a kind of remote controller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110091148.7A CN102738435B (en) 2011-04-12 2011-04-12 A kind of improved battery, nested battery and a kind of remote controller
PCT/CN2012/073643 WO2012139479A1 (en) 2011-04-12 2012-04-09 Rechargeable battery, nested battery and remote controller

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CN102738435A true CN102738435A (en) 2012-10-17
CN102738435B CN102738435B (en) 2016-04-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9224998B2 (en) 2011-12-04 2015-12-29 Jiankun Hu Rechargeable battery for replacing dry battery and its structural component and corresponding battery compartment
CN106601977A (en) * 2017-01-03 2017-04-26 奇酷互联网络科技(深圳)有限公司 Battery, electronic equipment and charging control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060082345A1 (en) * 2004-08-26 2006-04-20 Josef Daniel-Ivad Rechargeable alkaline battery with overcharging protection
EP1942568A1 (en) * 2007-01-04 2008-07-09 Aeneas Energy Technology Co., Ltd. Charging circuit for balancing charging serially connected batteries
CN102005793A (en) * 2010-11-22 2011-04-06 胡建坤 Charge-discharge control battery, nested battery and electric shaver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2768276Y (en) * 2004-11-16 2006-03-29 比亚迪股份有限公司 Stabilized voltage output circuit for chargeable battery
CN2786805Y (en) * 2005-02-07 2006-06-07 郑时明 Lithium charging battery
CN2935483Y (en) * 2005-11-10 2007-08-15 深圳市万拓电子技术有限公司 External battery bag of portable digital equipment
CN201638904U (en) * 2010-03-30 2010-11-17 奇恩电子股份有限公司 Rechargeable lithium battery
CN201868533U (en) * 2010-11-22 2011-06-15 胡建坤 Charging-discharging controllable battery, nested battery and electric shaver
CN202034453U (en) * 2011-04-12 2011-11-09 胡建坤 Improved battery, nested battery and remote controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060082345A1 (en) * 2004-08-26 2006-04-20 Josef Daniel-Ivad Rechargeable alkaline battery with overcharging protection
EP1942568A1 (en) * 2007-01-04 2008-07-09 Aeneas Energy Technology Co., Ltd. Charging circuit for balancing charging serially connected batteries
CN102005793A (en) * 2010-11-22 2011-04-06 胡建坤 Charge-discharge control battery, nested battery and electric shaver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9224998B2 (en) 2011-12-04 2015-12-29 Jiankun Hu Rechargeable battery for replacing dry battery and its structural component and corresponding battery compartment
CN106601977A (en) * 2017-01-03 2017-04-26 奇酷互联网络科技(深圳)有限公司 Battery, electronic equipment and charging control method
CN106601977B (en) * 2017-01-03 2019-08-02 奇酷互联网络科技(深圳)有限公司 Battery, electronic equipment and charge control method

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Publication number Publication date
CN102738435B (en) 2016-04-13
WO2012139479A1 (en) 2012-10-18

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