CN102340041B - Battery pack - Google Patents
Battery pack Download PDFInfo
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- CN102340041B CN102340041B CN201010228842.4A CN201010228842A CN102340041B CN 102340041 B CN102340041 B CN 102340041B CN 201010228842 A CN201010228842 A CN 201010228842A CN 102340041 B CN102340041 B CN 102340041B
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- battery
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery pack. The battery pack comprises a main battery and at least one balancing battery; and the balancing batteries are connected in series with the main battery. The balancing batteries have characteristics of a low-temperature battery, and the low-temperature discharge power of the balancing batteries is small in an attenuation range, so the battery pack can supply electric energy required during start-up to a load in a low-temperature environment.
Description
[technical field]
The present invention, about a kind of battery feed circuit, particularly about a kind of battery pack with low-temperature working compensation, can have at low temperatures enough energy as start and use so that take the load of this battery pack.
[background technology]
In recent years, along with scientific and technological progress, communication and consumer electronics industry are flourishing, many consumer loads, for example: gps satellite navigation, personal digital assistant, mobile phone, mobile computer, camera and video camera etc., be widely used in the middle of popular life.That for the requirement of miniaturization, lightweight and the high performance of this even load, also than common unit, comes is many, follow it, with the supplying cell of this even load, it requires the height also coming than general device, wherein, for the electric discharge load of supplying cell and cryogenic discharging characteristic in application, be limited to the conditions such as global design cost, size, complexity and market value, make the supplying cell of load always in the practical application of low temperature discharge, its technology cannot effectively break through.
Shown in Fig. 1 and Fig. 2, Fig. 1 is for showing the schematic diagram of existing battery pack offered load electric power, and Fig. 2 is for showing the discharge capacity of existing battery pack offered load and the oscillogram of cell voltage relation.As shown in the figure, transverse axis represents the discharge capacity of battery, and its unit is milliampere-hour, and the longitudinal axis represents the voltage of battery, and its unit is volt.Battery pack 100 connects a load 14 via one first load end 11 and one second load end 12, for example: mobile computer, the normal battery pack 100 with three strings three battery unit 13 as shown in the figure of using provides operation required electric power.The battery pack that wherein mobile computer is used, generally take ni-mh (NiMH) battery or NI-G (NiCd) battery as main, and more senior machine polygamy closes lithium ion (Li-ion) battery of the better and memory-less effect of continuous electric power.
As shown in Figure 2, discharge curve A1, the A2 of battery, A3, A4, A5 are in the early stage time, and the cell voltage of full charging all maintains a rated voltage level.During mobile computer start, the supply power voltage of battery pack 100 can fall down, through one section of mild interval, this interval voltage drop curve is also not obvious, until power supply latter stage, voltage just can be again fast toward declining, wherein, under different temperature sections, have the discharge curve of different distributions, and temperature is lower, its cell voltage and discharge capacity all can be less, therefore cause discharge curve A1, A2, A3, A4, the A5 with different distributions as shown in the figure.
From the above, existing on the market for the load supplying cell of mobile computer for example, it is under the environment of low temperature, owing to being limited to the chemical characteristic of battery own, under low temperature environment, its chemical characteristic is poor, only can in a certain temperature section, provide normal operating voltage, once lower than this temperature section, its service voltage will deficiency so that load normally use, particularly under the environment of negative 30 degree Celsius, the energy shortage that it provides is so that computer booting and use, therefore under the condition of this dynamic load, general supplying cell almost cannot reach service efficiency desired when low temperature.Lithium ion (Li-ion) battery of the better and memory-less effect of continuous electric power is because weight is light, volume energy density is higher, there is no again memory effect, therefore under the environment of low temperature, can allow reluctantly load for example mobile computer can be used as start and use, but it has the shortcoming that electric current is less, if the battery design with equal number, the chemical characteristic of its battery still can significantly shorten the service time under battery mode (Battery Mode), and the cost of battery also relative raising is many, do not meet the theory of product design.
Moreover, in the prior art of battery, although have dealer to design to be applicable to working in the special battery (being that dealer is used to the low temperature battery claiming) of lower temperature section, but relatively, the usefulness of this type of battery under high temperature section operational environment is also bad, and the cost of this type of battery is conventionally higher, this type of battery pack merely of usining, as the supplying cell of load, can not solve the problem that battery pack task performance is subject to ambient temperature effect.And the battery price that possesses low temperature battery characteristic is higher, if adopt low temperature battery as the battery pack of load supplying totally, cost is very high.
[summary of the invention]
In view of this, the object of the present invention is to provide a kind of battery pack that low-temperature working compensation has cost consideration concurrently that has, by generally cheaply main battery be connected in series balancing battery, with improve existing general battery pack under the environment of low temperature deficiency so that load open machine, and the expensive shortcoming that totally adopts low temperature battery.
Another object of the present invention is to provide a kind of battery pack that is applicable to operating in default universe working temperature section, by main battery and balancing battery, at different operating temperature section, bring into play different task performance combinations, make to load in predetermined working temperature section, can have enough high operating voltage and enough electric energy that it is normally used.
The technological means that the problem that the present invention is solution prior art adopts includes a main battery and at least one balancing battery that is connected in series main battery in battery pack, the negative pole of balancing battery is connected in the positive pole of main battery, positive pole is connected to load via a low temperature current supply circuit, selecting of balancing battery adopts the characteristic that possesses low temperature battery, and its low temperature discharge power attenuation amplitude is little.
In preferred embodiment of the present invention, more include a switching switches set, by open circuit and closed circuit two on off states, switch the different working modes of battery pack.Moreover, in a preferred embodiment, more include an electric current and suppress assembly, it is connected in series between balancing battery and the first load end, as load on startup stage as the use of inhibition electric current.
Via the technology used in the present invention means, at supply electric energy, to the main battery of load, be connected in series with balancing battery, because balancing battery is little at the discharge power attenuation amplitude of low-temperature working section, therefore making the present invention have the battery pack of low-temperature working compensation can be under the environment of low temperature, still can provide load required start electric energy, make load complete smoothly start.
The present invention completes start smoothly except possessing to make to load under low temperature environment, has more taken into account the consideration of cost.Owing to possessing, the battery price of low temperature battery characteristic is higher, usings general battery as main battery a small amount of low temperature battery of connecting in the present invention, can be so as to reach load low temperature start object under lower cost.
Specific embodiment of the present invention, by the embodiment by following and be attachedly graphic and be further described.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of existing battery pack offered load electric power;
Fig. 2 is the discharge capacity of existing battery pack offered load and the oscillogram of cell voltage relation;
Fig. 3 is the circuit diagram that the first embodiment of the present invention is powered under low temperature mode;
Fig. 4 is the circuit diagram that the first embodiment of the present invention is powered under normal mode;
Fig. 5 is the circuit diagram that the first embodiment of the present invention is powered under hot plug mode;
Fig. 6 is the circuit diagram that the second embodiment of the present invention is powered under low temperature mode;
Fig. 7 is the circuit diagram that the second embodiment of the present invention is powered under normal mode;
Fig. 8 is the circuit diagram that the second embodiment of the present invention is powered under hot plug mode.
[embodiment]
Consult shown in Fig. 3 the circuit diagram that it is powered under low temperature mode for the first embodiment of the present invention.The battery pack 200 with low-temperature working compensation of the present invention connects a load 6 via one first load end 21 and one second load end 22, in order to supply electric energy to this load 6, load 6 can be mobile computer, individual is assistant with oneself, one of portable electronic device, battery pack 200 is arranged at load 6 inside, battery pack 200 includes a main battery 3 and at least one balancing battery 4, main battery 3 includes at least one battery unit 30, in the present embodiment, by three strings three also the battery unit 30 of (3S3P) form main battery 3, main battery 3 has anodal 31 and one negative pole 32, the negative pole 41 of balancing battery 4 is connected in the positive pole 31 of main battery 3, 42, the positive pole of balancing battery 4 is connected to the first load end 21 via a low temperature current supply circuit C.
As shown in the figure, the battery pack 200 with low-temperature working compensation of the present invention more includes a switching switches set 5, include one first switch 51, one second switch 52, one the 3rd switch 53 and one the 4th switch 54, the first switch 51 is connected in series in 41, the positive pole 31 of main battery 3 and the negative pole of balancing battery 4, it has open circuit and closed circuit two on off states, second switch 52 is connected in series between the positive pole 42 and the first load end 21 of balancing battery 4, it also has open circuit and closed circuit two on off states, the 3rd switch 53 is connected in series between the positive pole 31 and the first load end 21 of main battery 3, it also has open circuit and closed circuit two on off states, and wherein one end of the 4th switch 54 is connected to the negative pole 41 of balancing battery 4 and the node D of the first switch 51, and the other end is connected in the negative pole 32 of main battery 3, it also has open circuit and closed circuit two on off states.
In the present embodiment, battery unit 30 in main battery 3 can be Ni-MH battery, nickel-cadmium cell or general lithium battery, main battery 3 is defined as one first power at the discharge power of taking the photograph formula 25 degree, main battery 3 is defined as one second power at the discharge powers of negative 20 degree of the formula of taking the photograph, and the first power subtracts after the second power the value divided by the first power gained again and is more than or equal to 0.5.
Balancing battery 4 can be an iron lithium phosphate battery (molecular formula LiFePO4, be called for short LFP), and also referred to as lithium iron phosphorus battery, it has, and operating voltage is moderate, capacitance is large, high discharge power, have extended cycle life and still have good supplied character at low temperature.Therefore can guarantee the fail safe of the High-current output input of balancing battery 4, and stand that other general battery of energy force rate of discharging and recharging will come greatly.Moreover, the battery cycle life of balancing battery 4 is approximately 4～5 times of general lithium battery, overall weight under same energy density, approximately compared with lithium battery, reduce 30～50%, and it has the high discharge power (can produce large electric current moment) higher than 8～10 times of lithium batteries.Balancing battery 4 is defined as one the 3rd power at the discharge power of taking the photograph formula 25 degree, and balancing battery 4 is defined as one the 4th power at the discharge powers of taking the photograph negative 20 degree of formula, and the 3rd power subtracts after the 4th power the value divided by the 3rd power gained again and is less than or equal to 0.35.
The significant consideration of selecting balancing battery 4 is the characteristic that balancing battery 4 must possess low-temperature operation power supply.Meaning i.e. this balancing battery 4 must meet the characteristic of low temperature battery.In preferred embodiment of the present invention, the mathematical expression that accords with required low temperature battery characteristic can be expressed as:
(W1-W2)/W1≤0.35
Wherein W1 is balancing battery at the discharge power of 25 ℃.
W2 is balancing battery at the discharge power of-20 ℃.
Also be, meeting low temperature battery is defined as: balancing battery subtracts balancing battery at the discharge power (W2) of taking the photograph negative 20 degree of formula at the discharge power (W1) of taking the photograph formula 25 degree, then divided by balancing battery, in the value of taking the photograph discharge power (W1) gained of formula 25 degree, is less than or equal to 0.35 again.
For example, the general battery under normal temperature (25 ℃) and low temperature battery discharge capability are 3.6 volts (V), 2 amperes (A), and discharge power is 7.2 watts (W).And general battery discharge ability under low temperature (20 ℃) is 3.6 volts (V), 0.5 ampere (A), discharge power is 1.8 watts (W).Therefore, the low temperature discharge power attenuation amplitude of general battery is (7.2W-1.8W)/7.2W=75%.And the discharge capability of low temperature battery under low temperature (20 ℃) is 3.6 volts (V), 1.5 amperes (A), discharge power is 5.4 watts (W).Therefore, the low temperature discharge power attenuation amplitude of low temperature battery is (7.2W-5.4W)/7.2W=25%.
In low temperature mode (the Low Temp Mode) circuit of Fig. 3, the first switch 51 and second switch 52 are closed circuit state, and the 3rd switch 53 and the 4th switch 54 are open-circuit condition.Because balancing battery 4 still has good supplied character under low temperature environment, can make up because of the decay electric power of required compensation of main battery 3 output power in low temperature environment.Main battery 3 and the pattern of balancing battery 4 to be connected in series therefore of the present invention with the battery pack 200 of low-temperature working compensation can provide stable operating voltage V1 to load 6 under the environment of low temperature.
Consult shown in Fig. 4 the circuit diagram that it is powered under normal mode for the first embodiment of the present invention.Under this normal mode (Normal Mode), the first switch 51, second switch 52, the 4th switch 54 are open-circuit condition, and only the 3rd switch 53 is closed circuit state, therefore main battery 3 provides an operating voltage V2 to load 6.
Consult shown in Fig. 5 the circuit diagram that it is powered under hot plug mode for the first embodiment of the present invention.In open state, if when user need inspect and need temporarily take off main battery 3 or need change another main battery 3 when main battery 3 power drain main battery 3, user can be by the circuit setting operation of battery pack 200 of the present invention in hot plug mode (Hot Swap Mode).In hot plug mode, the first switch 51 and the 3rd switch 53 are open-circuit condition, and second switch 52 and the 4th switch 54 are closed circuit state.Now, balancing battery 4 can temporarily provide operating voltage V3 to load 6 via second switch 52, at balancing battery 4, temporarily provides electrical power to after load 6, and user can be under open state, temporarily take off main battery 3 or change another main battery, and without changing again battery after shutdown.
Consult shown in Fig. 6 to Fig. 8, show respectively the circuit diagram that circuit diagram that the second embodiment of the present invention powers under low temperature mode, circuit diagram that the second embodiment powers under normal mode and the second embodiment power under hot plug mode, the composition assembly of this embodiment battery pack 200a is identical with the first embodiment haply, therefore identical assembly is the assembly numbering indicating with identical, as a means of correspondence.Its difference is that in circuit, more including an electric current suppresses assembly L, is connected in series between balancing battery 4 and second switch 52, and this electric current suppresses assembly L and can be an inductor, can be used as the use that suppresses electric current.
It is only the embodiment that exemplifies in circuit of the present invention that above-mentioned electric current suppresses assembly L.In actual application, also can comprise the circuit unit of other different circuit functions, for example pressurizer, metal-oxide half field effect transistor, induction reactance assembly ... Deng.The circuit unit of these difference in functionalitys all suppresses in the equivalent elements of assembly L containing being placed on defined electric current in the present invention.
From above embodiment, the value in the true tool industry of battery pack with low-temperature working compensation provided by the present invention, therefore the present invention had accorded with the important document of patent already.Only above narration be only preferred embodiment explanation of the present invention, is allly skillful in this skill person when doing according to above-mentioned explanation other all improvement, and only these change and still belong in spiritual and following the defined the scope of the claims of invention of the present invention.
Claims (11)
1. a battery pack, this battery pack supply electric energy to load, and it is inner to be arranged at this load, it is characterized in that, and this battery pack comprises:
One main battery, this main battery includes at least one battery unit, this main battery is defined as one first power at the discharge power of taking the photograph formula 25 degree, this main battery is defined as one second power at the discharge powers of negative 20 degree of the formula of taking the photograph, and the first power subtracts after the second power the value divided by the first power gained again and is more than or equal to 0.5;
At least one balancing battery, this balancing battery is defined as one the 3rd power at the discharge power of taking the photograph formula 25 degree, this balancing battery is defined as one the 4th power at the discharge powers of negative 20 degree of the formula of taking the photograph, and the 3rd power subtracts after the 4th power the value divided by the 3rd power gained again and is less than or equal to 0.35;
Wherein, this main battery provides electrical power to this load after connecting with this balancing battery.
2. battery pack as claimed in claim 1, is characterized in that, more includes a switching switches set, and this diverter switch group includes:
One first switch, is connected in series between this main battery and this balancing battery, and this first switch has open circuit and closed circuit two on off states;
One second switch, is connected in series between this balancing battery and this load, and this second switch has open circuit and closed circuit two on off states;
One the 3rd switch, is connected in series between this main battery and this load, and the 3rd switch has open circuit and closed circuit two on off states.
3. battery pack as claimed in claim 2, is characterized in that, this diverter switch group more includes one the 4th switch, is connected in parallel in this main battery and this first switch, and the 4th switch has open circuit and closed circuit two on off states.
4. battery pack as claimed in claim 2, is characterized in that, more includes an electric current and suppresses assembly, is connected in series between this balancing battery and this second switch.
5. battery pack as claimed in claim 1, is characterized in that, this load is one of mobile computer, personal digital assistant.
6. battery pack as claimed in claim 1, is characterized in that, this battery unit is Ni-MH battery, nickel-cadmium cell or lithium battery.
7. battery pack as claimed in claim 1, is characterized in that, this balancing battery is iron lithium phosphate battery.
8. a battery pack, this battery pack supply electric energy to load, and it is inner to be arranged at this load, it is characterized in that, and this battery pack comprises:
One main battery, this main battery includes at least one battery unit, this main battery is defined as one first power at the discharge power of taking the photograph formula 25 degree, this main battery is defined as one second power at the discharge powers of negative 20 degree of the formula of taking the photograph, and the first power subtracts after the second power the value divided by the first power gained again and is more than or equal to 0.5;
At least one balancing battery, this balancing battery possesses the characteristic of low temperature battery, this balancing battery is defined as one the 3rd power at the discharge power of taking the photograph formula 25 degree, this balancing battery is defined as one the 4th power at the discharge powers of negative 20 degree of the formula of taking the photograph, and the 3rd power subtracts after the 4th power the value divided by the 3rd power gained again and is less than or equal to 0.35;
Wherein, this main battery is connected with this balancing battery and is provided electrical power to this load by suppressing assembly by an electric current.
9. battery pack as claimed in claim 8, is characterized in that, more includes a switching switches set, and this diverter switch group includes:
One first switch, is connected in series between this main battery and this balancing battery, and this first switch has open circuit and closed circuit two on off states;
One second switch, is connected in series in this electric current and suppresses between assembly and this load, and this second switch has open circuit and closed circuit two on off states;
One the 3rd switch, is connected in series between this main battery and this load, and the 3rd switch has open circuit and closed circuit two on off states.
10. battery pack as claimed in claim 9, is characterized in that, this diverter switch group more includes one the 4th switch, is connected in parallel in this main battery and this first switch, and the 4th switch has open circuit and closed circuit two on off states.
11. battery pack as claimed in claim 9, is characterized in that, this load is one of mobile computer, personal digital assistant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010228842.4A CN102340041B (en) | 2010-07-16 | 2010-07-16 | Battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010228842.4A CN102340041B (en) | 2010-07-16 | 2010-07-16 | Battery pack |
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| CN102340041A CN102340041A (en) | 2012-02-01 |
| CN102340041B true CN102340041B (en) | 2014-04-16 |
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| CN201010228842.4A Active CN102340041B (en) | 2010-07-16 | 2010-07-16 | Battery pack |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104679208A (en) * | 2015-03-10 | 2015-06-03 | 山东超越数控电子有限公司 | Method for low-temperature starting and working of reinforced tablet computer |
| CN104977962B (en) * | 2015-07-08 | 2017-01-11 | 中北大学 | Temperature-control combined power supply |
| CN110048479A (en) * | 2019-04-22 | 2019-07-23 | 维沃移动通信有限公司 | A kind of battery control method and terminal device |
| CN112671063A (en) * | 2020-12-18 | 2021-04-16 | 北京筑梦园科技有限公司 | Power supply method, processor and parking charging system |
| CN112600274A (en) * | 2020-12-18 | 2021-04-02 | 北京筑梦园科技有限公司 | Power supply method, processor and parking charging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1315227A2 (en) * | 2001-11-22 | 2003-05-28 | Hitachi, Ltd. | Power supply unit, distributed power supply system and electric vehicle loaded therewith |
| CN101552348A (en) * | 2009-02-13 | 2009-10-07 | 深圳市雄韬电源科技有限公司 | Mixing accumulator system |
| CN201466770U (en) * | 2009-05-22 | 2010-05-12 | 深圳市德泽能源科技有限公司 | Novel lithium iron phosphate battery balance charge protecting circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003174734A (en) * | 2001-12-06 | 2003-06-20 | Shin Kobe Electric Mach Co Ltd | Hybrid secondary battery |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1315227A2 (en) * | 2001-11-22 | 2003-05-28 | Hitachi, Ltd. | Power supply unit, distributed power supply system and electric vehicle loaded therewith |
| CN101552348A (en) * | 2009-02-13 | 2009-10-07 | 深圳市雄韬电源科技有限公司 | Mixing accumulator system |
| CN201466770U (en) * | 2009-05-22 | 2010-05-12 | 深圳市德泽能源科技有限公司 | Novel lithium iron phosphate battery balance charge protecting circuit |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2003-174734A 2003.06.20 |
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