CN102195067B - Battery pack - Google Patents
Battery pack Download PDFInfo
- Publication number
- CN102195067B CN102195067B CN201010131599.4A CN201010131599A CN102195067B CN 102195067 B CN102195067 B CN 102195067B CN 201010131599 A CN201010131599 A CN 201010131599A CN 102195067 B CN102195067 B CN 102195067B
- Authority
- CN
- China
- Prior art keywords
- battery pack
- battery
- voltage
- protective circuit
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- 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
Abstract
The invention relates to a battery pack which can be connected to an electric tool so as to supply electric power for the electric tool or can be connected to a charging device so as to be charged. The batter pack comprises a sell, a plurality of battery units accommodated in the shell, an anode terminal, a cathode terminal and a protective circuit, wherein the protective circuit is operable and is electrically connected with the anode terminal and the cathode terminal, the protectively circuit comprises a load, a switching element connected with the load in series and a control unit for controlling the switching element to be on or off. By means of the battery pack, the voltage inside the battery pack can be released to a preset voltage value by the protective circuit after charging is finished.
Description
Technical field
The present invention relates to a kind of battery pack.
Background technology
Nowadays, battery is widely used on electric tool, has adopted the electric tool of battery can break away from the constraint of cable and can use anywhere or anytime.These batteries are rechargeable battery normally, as lead acid accumulator.
This type of rechargeable battery is when charging, for battery capacity being charged to the more than 95% of charging capacity of nominal, generally by the nominal voltage higher than battery of the cut-ff voltage setting of charging.If the charge cutoff voltage of the lead acid accumulator of 36V is 44.1V.After charging finishes, this part voltage exceeding can be within a period of time automatic fall-back, as 36V lead acid accumulator falls after rise to 42V and needs the time of about 10 seconds from 44.1V after charging finishes.And during this period of time, the voltage of the voltage of battery during higher than normal work, when design, need select larger voltage, the electronic device of current parameters, this will increase cost.Simultaneously when safety is tested, have related request, require battery from charger pulls away, the both positive and negative polarity voltage of battery need be lower than 42V, otherwise need carry out safety detection according to high-voltage electric tool standard.For this safety requirement, existing common practice is the charge cutoff voltage that improves the requirement of electronic device or reduce battery.But the requirement that improves electronic device, need to increase cost; And reduction charge cutoff voltage can not reach the more than 95% of charging capacity of nominal while charging, affected the result of use of instrument.
Summary of the invention
The invention provides a kind of low cost, and without the battery pack that reduces charge cutoff voltage.
For achieving the above object, technical scheme of the present invention is: a kind of battery pack, and the exercisable electric tool that is connected to thinks that it provides electric power, or is connected to charging device and charges, and comprising: housing; Be contained in the some battery units in housing; Positive pole and negative terminal; It is characterized in that: described battery pack also comprises the protective circuit that exercisable and described positive pole and negative terminal are electrically connected, and described protective circuit comprises: load; The switch element of connecting with load; And the control unit of controlling described switch element closure or disconnecting, when the voltage of battery pack is higher than predeterminated voltage value, the closed described switch element of described control unit is also released into predeterminated voltage value by described load by battery voltage, when the voltage of battery pack is less than or equal to predeterminated voltage value, described control unit disconnects described switch element and stops the release of load to battery voltage.
Preferably, when described battery pack is connected to charging device, disconnect being connected of described protective circuit and described positive terminal; Described battery pack is from charging device pulls away, and described protective circuit and described positive pole and negative terminal are electrically connected.
Preferably, described battery pack also comprises mechanical shell fragment, and described protective circuit is connected with described positive terminal by described mechanical shell fragment.
Preferably, described protective circuit is down to described predeterminated voltage value required time by described battery voltage and is less than 1 second.
Preferably, described load is resistance.
Preferably, described switch element is thyristor.
Preferably, described control unit is voltage-reference.
Preferably, described control unit is MCU.
Preferably, described predeterminated voltage value is 42V.
Preferably, described battery pack is lead-acid battery group.
Compared with prior art; the invention has the beneficial effects as follows: when the protective circuit in battery pack detects battery voltage over predeterminated voltage value; get final product automatic discharging; battery voltage is reduced to predeterminated voltage value; reduced the requirement to electronic device; be conducive to reduce costs, and meet relevant safety test request.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the invention will be further described.
Fig. 1 is the schematic diagram of the preferred embodiment of battery pack of the present invention.
Fig. 2 is the theory diagram of the preferred embodiment of battery pack of the present invention.
Fig. 3 is the circuit theory diagrams of the preferred embodiment of battery pack of the present invention.
Wherein, related elements reference numeral is as follows:
1. battery unit 2. switch 3. protective circuits
11. positive terminal 12. negative terminal 31. inputs
32. output 33. control unit 34. switch elements
35. load 99. housing 100. battery pack
Embodiment
Fig. 1-Fig. 3 is the schematic diagram of the preferred embodiment of battery pack 100 of the present invention, and described battery pack 100 comprises housing 99, positive terminal 11 and negative terminal 12, and be contained in the battery unit 1 in housing 99, switch 2, protective circuit 3.
Fig. 2 is the theory diagram of the preferred embodiment of battery pack 100 of the present invention, switch 2 is series between the positive terminal 11 of battery unit 1 and the input 31 of protective circuit 3, in order to the positive terminal 11 of the input of protective circuit 3 31 and battery unit 1 is connected or is disconnected, switch 2 can be that mechanical switch can be also electronic switch, in the present embodiment, protective circuit 3 is connected with positive terminal 11 by mechanical shell fragment, when battery pack 100 is connected to charging device, because of the insertion of charging device, there is elastic deformation in machinery shell fragment, disconnect being connected between protective circuit 3 and positive terminal 11, when battery pack 100 completes charging while pulling away from charging device, machinery shell fragment being connected of recovery and protection circuit 3 and positive terminal 11 under the effect of self elastic force, without operator's operation bidirectional, also without charging device is improved.Described protective circuit 3 comprises control unit 33, switch element 34 and load 35.Control unit 33 detects the magnitude of voltage of battery units 1, and controls closure or cut-off switch unit 34, to allow and to forbid current direction load 35.Switch element 34 is semiconductor switch; Control unit can adopt MCU, by MCU, the voltage of battery unit 1 is detected, and exports the closed of control signal control switch unit 34 or disconnect; Control unit also can adopt voltage-reference, by the conducting that provides reference voltage to control voltage-reference to voltage-reference, and then the closed or disconnection of control switch unit 34.In order to reach battery pack from charger pulls away, the both positive and negative polarity voltage of battery pack is reduced to one at once lower than the object of the predeterminated voltage value of 42V, to being less than 1S the discharge time of battery pack, load 35 need meet the demand of heavy-current discharge, therefore load 35 can adopt little, the high-power resistive element of resistance, also can adopt the electron-like element that emits light and heat; But the general volume of this type of electronic component is larger, so adopt the mode of three resistance parallel connections in the present embodiment, reduced the volume of load.When battery pack is lead-acid battery group, charge cutoff voltage is 44.1V, when predeterminated voltage value is 41V, adopts the resistance parallel connection in 3 100 Europe as load, and battery voltage value is released into predeterminated voltage value, only needs 600ms; Be the moment that battery pack pulls away from charger, the both positive and negative polarity voltage of battery is just lower than 42V.
Fig. 3 is the circuit theory diagrams of the preferred embodiment of battery pack 100 of the present invention.Wherein, the control unit 33 shown in Fig. 2 is comprised of R11, R12, R13, R14, R18, R19, R20, Q1, U2, C3, D6 in Fig. 3, and Q1 is triode, and U2 is voltage-reference TL431; Switch element 34 shown in Fig. 2 is comprised of triode Q2 in Fig. 3; Load 35 shown in Fig. 2 is comprised of three resistance R in parallel 15, R16, R17 in Fig. 3.One end of R11 is connected to input 31, and one end is connected to output 32 in addition; The base stage of Q1 is connected to input 31, and collector and emitter is connected to respectively positive pole and the negative pole of C3; The positive pole of D6 is connected to input 31, and negative pole is connected with the collector electrode of Q1 and the positive pole of C3; One end of R12 is connected with the emitter of the negative pole of C3 and Q1, and the other end is connected with R13, and the other end of R13 is connected to output 32; The collector electrode of Q2 is connected to input 31, and base stage is connected to one end of R14, and emitter is connected to one end of R19; R18 is connected between the base stage and collector electrode of Q2; No. 1 pin of U2 is connected with the other end of R14, and No. 2 pin is connected with the lead-in wire between R12, R13, and No. 3 pin is connected to output 32; R20 is connected between the other end of R19 and No. 2 pins of U2; One end of R15, R16, R17 is connected to the emitter of Q2, and the other end is connected to output 32.
As shown in Figures 2 and 3, when charging device is connected to battery pack 100 and charges, switch 2 disconnects being connected between the positive terminals 11 of battery unit 1 and the input 31 of protective circuit 3; When battery pack 100 completes charging while removing from charging device, switch 2 closures, positive terminal 11 is connected with input 31.1 couple of C3 of battery unit charges, before the charging of C3 is completed, C3 is in conducting state, and the voltage of battery unit 1 carries out dividing potential drop through R12, R13, when the magnitude of voltage of battery unit 1 is during higher than predeterminated voltage value, No. 2 pins that can be U2 by D6, C3, R12, R13 loop provide reference voltage, make its conducting, and then can offer Q2 base current, make Q2 conducting, allow current direction load 35, battery unit is discharged; Meanwhile, during Q2 conducting, the voltage of battery unit 1, through R19, after R20 dividing potential drop, by Q2, R19, R20 loop continues as U2 that reference voltage is provided, and makes C3 be full of electricity when off-state, U2 still can maintain Q2 conducting, and electric discharge is proceeded.Until the magnitude of voltage of battery unit 1 is while being less than or equal to predeterminated voltage value, the voltage of battery unit 1 is through R19, after R20 dividing potential drop lower than the reference voltage of U2, Q2, R19, R20 loop cannot provide required reference voltage for U2, U2 disconnects, and then controls Q2 disconnection, stops the electric discharge to battery unit 1.When switch 2 disconnects, R11 is as the base resistance of Q1, and Q1 conducting, discharges to C3 by R12, R13, so that switch 2 when closed, charges to C3 again.
In the present invention; by protective circuit is set in battery pack; make battery pack when removing from charging device, can judge that whether self voltage is higher than predeterminated voltage value; if higher than predeterminated voltage value; battery pack is discharged; when battery voltage is not during higher than predeterminated voltage value, stop electric discharge process.And do not need to improve the requirement of electronic device in electric tool or the cut-ff voltage that reduction is charged, thus greatly reduce the cost of manufacture, and meet relevant safety test request.
Claims (9)
1. a battery pack, the exercisable electric tool that is connected to thinks that it provides electric power, or is connected to charging device and charges, and comprising:
Housing;
Be contained in the some battery units in housing;
Positive terminal and negative terminal;
It is characterized in that:
Described battery pack also comprises the protective circuit that exercisable and described positive terminal and negative terminal are electrically connected, and when described battery pack is connected to charging device, disconnects being connected of described protective circuit and described positive terminal; Described battery pack is from charging device pulls away, and described protective circuit and described positive pole and negative terminal are electrically connected, and described protective circuit comprises:
Load;
The switch element of connecting with load;
And the control unit of controlling described switch element closure or disconnecting, when the voltage of battery pack is higher than predeterminated voltage value, the closed described switch element of described control unit is also released into predeterminated voltage value by described load by battery voltage, when the voltage of battery pack is less than or equal to predeterminated voltage value, described control unit disconnects described switch element and stops the release of load to battery voltage.
2. battery pack according to claim 1, is characterized in that: described battery pack also comprises mechanical shell fragment, and described protective circuit is connected with described positive terminal by described mechanical shell fragment.
3. battery pack according to claim 1, is characterized in that: described protective circuit is down to described predeterminated voltage value required time by described battery voltage and is less than 1 second.
4. battery pack according to claim 1, is characterized in that: described load is resistance.
5. battery pack according to claim 1, is characterized in that: described switch element is thyristor.
6. battery pack according to claim 1, is characterized in that: described control unit comprises voltage-reference.
7. battery pack according to claim 1, is characterized in that: described control unit is MCU.
8. battery pack according to claim 1, is characterized in that: described predeterminated voltage value is 42V.
9. battery pack according to claim 1, is characterized in that: described battery pack is lead-acid battery group.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010131599.4A CN102195067B (en) | 2010-03-11 | 2010-03-11 | Battery pack |
| PCT/CN2011/071729 WO2011110102A1 (en) | 2010-03-11 | 2011-03-11 | Battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010131599.4A CN102195067B (en) | 2010-03-11 | 2010-03-11 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102195067A CN102195067A (en) | 2011-09-21 |
| CN102195067B true CN102195067B (en) | 2014-10-08 |
Family
ID=44562893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010131599.4A Expired - Fee Related CN102195067B (en) | 2010-03-11 | 2010-03-11 | Battery pack |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102195067B (en) |
| WO (1) | WO2011110102A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2651946Y (en) * | 2003-10-16 | 2004-10-27 | 中国电子科技集团公司第十八研究所 | Special balancing protective circuit of lithium ion battery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0568347A (en) * | 1991-09-09 | 1993-03-19 | Sony Corp | Battery discharge control circuit |
| CA2406500C (en) * | 2001-10-01 | 2008-04-01 | Research In Motion Limited | An over-voltage protection circuit for use in a charging circuit |
| JP4096951B2 (en) * | 2005-03-28 | 2008-06-04 | 松下電工株式会社 | Electrical equipment |
| KR100782101B1 (en) * | 2005-04-08 | 2007-12-04 | 유니썸테크놀로지 주식회사 | Protection circuit and battery pack having the same |
| CN201667551U (en) * | 2010-03-11 | 2010-12-08 | 苏州宝时得电动工具有限公司 | Battery pack |
-
2010
- 2010-03-11 CN CN201010131599.4A patent/CN102195067B/en not_active Expired - Fee Related
-
2011
- 2011-03-11 WO PCT/CN2011/071729 patent/WO2011110102A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2651946Y (en) * | 2003-10-16 | 2004-10-27 | 中国电子科技集团公司第十八研究所 | Special balancing protective circuit of lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102195067A (en) | 2011-09-21 |
| WO2011110102A1 (en) | 2011-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20200311 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |