CN102064570A - Assembled battery and charging system - Google Patents
Assembled battery and charging system Download PDFInfo
- Publication number
- CN102064570A CN102064570A CN2010105090152A CN201010509015A CN102064570A CN 102064570 A CN102064570 A CN 102064570A CN 2010105090152 A CN2010105090152 A CN 2010105090152A CN 201010509015 A CN201010509015 A CN 201010509015A CN 102064570 A CN102064570 A CN 102064570A
- Authority
- CN
- China
- Prior art keywords
- voltage
- charging
- secondary cell
- temperature
- battery pack
- 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.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides an assembled battery and a charging system, allowing reliably informing a charger of the information necessary for the safe charging of a secondary battery and performing the safe charging, and enabling an old-type charger which controls the charging by detecting the battery temperature to perform the safe charging. According to the voltage and the temperature of terminals of the secondary battery, four charging conditions for the safe charging of the secondary battery is distinguished, and one of control voltages at four levels with different voltage levels is selected and outputted to the charger. Specially, according to the voltage and the temperature of the terminals of the secondary battery, one of four charging conditions predetermined according to the combination of voltage regions and temperature regions is selected, wherein the voltage regions are formed by dividing the terminal voltage region of the secondary battery to three levels in advance, and the temperature regions are formed by dividing the chargeable temperature region of the secondary battery to two levels in advance.
Description
Technical field
The present invention relates to Battery pack and charging system, can reliably that the secondary cell safe charging is required information be notified to charger and carry out safe charging, even and if use by detecting the charge old-fashioned charger of control of battery temperature and also can carry out safe charging.
Background technology
Be connected to when charging on the charger at the Battery pack that will have secondary cell, secondary cell be charged to efficiently be full of electricity condition from needless to say, safe charging is extremely important.Especially lithium ion battery when using as secondary cell, requires fully to guarantee the fail safe of charging especially.
In addition, about the safe charging of lithium ion battery, recommend the condition (safety requirements) of following specification for decision charging voltage and charging current.For example shown in the image pattern 8, in the normal temperature district (0～45 ℃), the charging voltage upper limit (voltage is forbidden in charging) is decided to be 4.25V/cell to this specification; In the high-temperature district (45～60 ℃), the charging voltage upper limit (voltage is forbidden in charging) is decided to be 4.15V/cell; Beyond above-mentioned each humidity province (below 0 ℃ or more than 60 ℃), itself just is under an embargo charging.In addition, for the maximum charging current of secondary cell, for example the low temperature district in the normal temperature district (0～10 ℃) is decided to be 0.5C; Zone (10～60 ℃) beyond in above-mentioned low temperature district is decided to be 1.0C.In addition, in normal temperature district (0～60 ℃) gamut, this maximum charging current is set to 1.0C or 1.5C.
In order to make secondary cell charge, satisfy the as above safety condition of regulation simultaneously again, advocate having on the Battery pack of secondary cell being provided with: voltage detection mechanism, detect the terminal voltage (cell voltage) of secondary cell; And temperature testing organization, the temperature (cell temperature) of detection secondary cell.According to these detected voltage of each testing agency and temperature, to the secondary cell control (for example, with reference to patent documentation 1) of charging.Particularly, patent documentation 1 discloses following content: according to battery temperature, secondary cell is carried out the charging voltage restriction, then, and margin system charging current, the limit is to secondary cell charge.
In addition, patent documentation 1 also discloses following content: maximum charging voltage is all stipulated in each humidity province of dividing in advance, and when the terminal voltage of secondary cell is higher than above-mentioned maximum charging voltage, to the voltage level signal of e-machine (for example charger) output needle to each humidity province formulation.
[patent documentation 1] TOHKEMY 2009-44946 communique
Want to carry out above-mentioned charging control, just need to make up Battery pack and the charger that is connected this Battery pack according to the charging controlling schemes that pre-establishes.Particularly, as shown in Figure 9, a control part need be set, for constituting the Battery pack A that is exported various charging control signals by control terminal CHG, judge above-mentioned charging control signal on charger B, control is to the charging of Battery pack (secondary cell) A.But what can't deny is, via control terminal CHG and charger B between under the situation of the charging control signal shown in the above-mentioned patent documentation 1 of transmission, in general, the control on the charger B is very complicated.
In addition, in Fig. 9, the 1st, the secondary cell of a plurality of battery units of connection in series-parallel; The 2nd, the voltage detection department of the terminal voltage (cell voltage) of detection secondary cell (battery unit) 1; The 3rd, the current detecting part of the charging and discharging currents of detection secondary cell 1; The 4th, as the thermistor of the temperature testing organization that detects secondary cell 1 temperature; The 5th, the charging control section that constitutes by microcomputer and protection IC etc.; 6, the 7th, series connection is inserted in protecting secondary battery FET on the charge-discharge circuit of secondary cell 1, that driven by above-mentioned charging control section 5.In addition, the 8th, the power supply unit of charging power is provided to secondary cell 1; The 9th, the control part of the charging action of the above-mentioned power supply unit 8 of control that constitutes by microcomputer etc.
With respect to this, existing general Battery pack (old Battery pack) C only is for example shown in Figure 8, has been equipped with temperature terminal (thermistor terminal) TH that is used for detecting battery temperature.And, charger (old charger) D to this Battery pack C charging constitutes: the terminal voltage that for example detects secondary cell 1 from this lead-out terminal, and via the temperature of said temperature terminal TH test set battery (secondary cell 1), thus, be independent of Battery pack C, to the control of charging of above-mentioned secondary cell 1.That is to say that above-mentioned Battery pack C and charger D have made up a kind of charging system, its system is different with the charging system that above-mentioned battery A and charger B make up.
Yet it is to wish shown in the dotted line of Fig. 9 that a kind of requirement is arranged, even if above-mentioned Battery pack A is installed on the old type charger D, and also can be to secondary cell 1 safe charging.But, in this case, have following problem:,, carry out charging control so can't use this charging control signal effectively flexibly because old type charger D does not possess the function of the meaning that charging control signal had of decision set battery A output.
Summary of the invention
The present invention considers such situation and proposes, its purpose is to provide a kind of Battery pack and charging system, the information that the secondary cell safe charging needs can be notified to charger reliably and carry out safe charging, in addition, even if use above-mentioned old-fashioned charger also can carry out safe charging.
That is to say, the objective of the invention is to, a kind of Battery pack and charging system are provided, easy and reliably to charger notice by Battery pack on the terminal voltage of detected secondary cell and the charging control information that is used for this secondary cell is carried out safe charging of battery temperature decision, simplify the charging control on this charger, even and if Battery pack is connected on the old type charger that does not possess this charging controlled function, also can carry out safe charging to secondary cell.
In order to achieve the above object, the feature of Battery pack of the present invention is to possess: secondary cell; Voltage detection mechanism detects the terminal voltage of this secondary cell; Temperature testing organization detects the temperature of described secondary cell; Logical circuit according to the terminal voltage and the temperature of the detected described secondary cell of these testing agencies' difference, is distinguished a plurality of charge conditions that make described secondary cell safe charging; And output circuit, according to the output of this logical circuit, from the control voltage of the mutually different a plurality of grades of voltage level, select one, offer charger to described secondary cell charge.Described logical circuit is according to the terminal voltage and the temperature of the detected described secondary cell of described each testing agency's difference, from a plurality of (for example 4) charge condition, select one, described a plurality of charge condition is formulated according to following combination in advance, promptly in advance the terminal voltage of described secondary cell is distinguished into a plurality of grades (for example 3 grades) voltage zone, with the combination that in advance the chargeable humidity province of described secondary cell is distinguished into the humidity province of a plurality of grades (for example 2 grades).
In addition, the chargeable humidity province of described secondary cell is for example normal temperature district (0～45 a ℃) and high-temperature district (45～60 ℃).The voltage threshold of distinguishing described a plurality of grade (for example 3 grades) voltage zone is that the standard recommendation charging voltage in described normal temperature district and the high temperature that is lower than the described high-temperature district of this standard recommendation charging voltage formulation are recommended charging voltage.Described logical circuit constitutes, from the output signal of representing various states, select one, generate as described control signal, described various state is: the temperature of described secondary cell when (below 0 ℃ or more than 60 ℃), is forbidden the charging illegal state that described secondary cell is charged beyond described normal temperature district and high-temperature district; The temperature of described secondary cell when described standard recommendation charging voltage is above, limits the charging current of described secondary cell at the terminal voltage of described normal temperature district and described secondary cell, allows the electric current restriction state that charges; The temperature of described secondary cell when this high temperature recommends charging voltage above, limits the charging voltage of described secondary cell at the terminal voltage of described high-temperature district and described secondary cell, allows the voltage limit state that charges; Under the situation in addition, allow the charging License Status that described secondary cell is charged with the recommendation charging voltage in relevant temperature district.
In addition, described control voltage is generated as, for example the voltage that reduced by classification according to the order of described charging illegal state, described charging License Status, described voltage limit state and described electric current restriction state of its voltage level of the output signal of described logical circuit.
In addition, described secondary cell is the battery that a plurality of lithium ion battery connection in series-parallel are connected.Described voltage detection mechanism detects the cell voltage of described lithium ion battery.
In addition, charging system involved in the present invention is made up of with the charger that described secondary cell is charged that links to each other with this Battery pack the above-mentioned Battery pack that constitutes.Described charger constitutes, and possesses the charging controlling organization, and this charging controlling organization judges that to the control voltage level of described Battery pack output restriction is applied to charging voltage and/or the charging current on the described secondary cell.
Perhaps, described charger is imported the control voltage of described Battery pack output as the temperature information of described secondary cell, when the level of described control voltage is not in by the voltage range of predefined upper voltage limit and lower voltage limit defined, think that the temperature of described secondary cell not in the chargeable humidity province of this secondary cell, stops the charging of described secondary cell.When the charge condition that the described output circuit in the especially described Battery pack is selected at described logical circuit is forbidden for charging and/or during the restriction charging current, output is by the control voltage of the voltage level beyond the voltage range of described upper voltage limit and lower voltage limit regulation.
According to Battery pack of the present invention, because just with the charge condition of secondary cell safe charging terminal voltage (cell voltage) and battery temperature according to secondary cell, be set at a plurality of (for example 4) charge condition, with of control voltage (for example export 4 the situations) output of these charge conditions as the mutually different a plurality of grades of voltage level (for example 4 grades), so above-mentioned charge condition is oversimplified, and be notified to charger reliably.
In addition, for charger, owing to just judge the mutually different control voltage of voltage level of above-mentioned a plurality of grade (for example 4 grades), so its determination processing is easier to, charging control to secondary cell Battery pack can be entrusted in addition, the simplification of its control can be realized.
What will carry especially is, as the charge condition that is used for the secondary cell safe charging, the chargeable humidity province of this secondary cell is set at for example normal temperature district (0～45 ℃) and high-temperature district (45～60 ℃), under the situation in addition of described humidity province (normal temperature district and high-temperature district) (for example below 0 ℃ or more than 60 ℃), the charging to secondary cell is forbidden in a free burial ground for the destitute.In addition, because the temperature at secondary cell is included under the situation in described normal temperature district, only according to the terminal voltage of this secondary cell recommendation charging voltage that whether is above standard, and if under the situation in high-temperature district, whether the terminal voltage according to this secondary cell surpasses the high temperature recommendation charging voltage that is lower than described standard recommendation charging voltage formulation, selects the mode of this charging control, so, when guaranteeing the secondary cell fail safe, can charge to secondary cell very simply.
And, be under the situation of old type charger of not corresponding above-mentioned charging control at charger, it is to be used for conducting to turn-off the temperature information of this charger action that the control signal that provides is provided, so, the function that can use this charger to possess is effectively flexibly carried out safe charging to secondary cell.Particularly, under the situation that the restriction electric current charges to secondary cell,, be considered as the rising of battery temperature so will represent the information of above-mentioned electric current restriction because secondary cell has been in the state that is charged to a certain degree, temporarily stop this charging, just can carry out safe charging secondary cell.
Description of drawings
Fig. 1 is the summary pie graph of the major part of the related Battery pack of an embodiment of the invention.
Fig. 2 represent that an example is distinguished at the judgement of the terminal voltage of secondary cell and battery temperature and according to these judge distinguish set above-mentioned secondary cell is carried out the charge condition of safe charging.
Fig. 3 represents charge condition shown in Figure 2 and according to the relation between the control voltage of this charge condition output.
Fig. 4 is an output circuit that generates is selected in expression from the mutually different control voltage of the voltage level of 4 grades a configuration example.
Fig. 5 is another configuration example of output circuit.
Fig. 6 is the example of the charging control flow on the expression charger.
Fig. 7 is that the expression battery temperature is followed the situation of charging control variation and the situation of charging voltage and charging current variation.
Fig. 8 is the example of expression at the safety requirements of the charging of lithium ion battery.
Fig. 9 is that expression has been implemented the combination of the Battery pack of charging Security Countermeasures and charger and implemented the Battery pack of charging Security Countermeasures and the annexation of the combination of charger.
Among the figure:
A, B ... Battery pack
C, D ... charger
1 ... secondary cell
2 ... voltage detection department
3 ... current detecting part
4 ... thermistor (temperature testing organization)
5 ... charging control section
5a ... logical circuit
5b ... output circuit
8 ... power supply unit
9 ... control part
Embodiment
Below, with reference to accompanying drawing, describe to the related Battery pack of an embodiment of the invention with at the charging system of this Battery pack.
The related Battery pack E of present embodiment has identical structure with Battery pack A shown in Figure 9 basically.Particularly, Battery pack E has secondary cell 1, this secondary cell 1, in addition, is discharged charging power by external mechanical (charger) charging via a pair of terminal [+] [-] that discharges and recharges to being connected in the above-mentioned a pair of external mechanical (e-machine) that discharges and recharges terminal [+] [-].This secondary cell 1 constitutes connection in series-parallel and connects a plurality of secondary battery cell, for example lithium ionic cell unit.In example shown in Figure 1, though represented the secondary cell 1 of structure that 3 sections battery units that are connected in parallel in twos are connected in series, this structure decides according to the desired electric current and voltage specification of Battery pack E and gets final product.
In addition, with regard to the charging of Battery pack E, be under the situation of lithium ion battery at above-mentioned secondary cell 1, carry out constant-current constant-voltage charging basically, in this constant-current constant-voltage charging with limit maximum charge current about 0.5～1.0C, and maximum charging voltage is limited in about 4.2V/cell.And, reach the set point of regulation when above at the terminal voltage (cell voltage) of secondary cell 1, when perhaps this charging current is lower than the set point of regulation, regards it as in the testing process and be full of electricity, and stop this charging.
Above-mentioned Battery pack E comprises: voltage detection department 2 by detecting the cell voltage of every section battery unit, detects the terminal voltage of above-mentioned secondary cell 1; With current detecting part 3, the charge-discharge circuit of above-mentioned secondary cell 1 is inserted in series connection, detects the charging and discharging currents of this secondary cell 1.In addition, also comprise thermistor (temperature testing organization) 4, detect the temperature of this Battery pack E and the temperature (cell temperature) of above-mentioned secondary cell 1.
The effect of the charging control section 5 that is made of microcomputer and protection IC etc. is: control is protected above-mentioned secondary cell 1 simultaneously to the charging of above-mentioned secondary cell 1, avoids overcharging and overdischarge.Particularly be exactly; this charging control section 5 is according to the terminal voltage (cell voltage) of above-mentioned voltage detection department 2 detected above-mentioned secondary cells 1 with via the temperature (cell temperature) of thermistor 4 detected secondary cells 1; control the charging of above-mentioned secondary cell 1; simultaneously according to above-mentioned current detecting part 3 detected charging and discharging currents; secondary cell 1 is protected, avoided the interference of abnormal current.
In addition; the protection of 5 pairs of above-mentioned secondary cells 1 of charging control section is carried out in the following manner: by drive selectively series connection insert the charging of the charge-discharge circuit of above-mentioned secondary cell 1 forbid with and discharge forbid the FET6,7 of usefulness, block the charge-discharge circuit of secondary cell 1.In addition, charging forbid with and the discharge FET6,7 that forbids usefulness also be located at sometimes on the charge-discharge circuit of side of the positive electrode of this secondary cell 1, rather than be located on the charge-discharge circuit of negative side of secondary cell shown in Figure 11.
For the Battery pack that constitutes as mentioned above basically, the characteristic point of Battery pack E involved in the present invention is, above-mentioned charging control section 5 constitutes, temperature (cell temperature) according to terminal voltage (cell voltage) and this secondary cell 1 of above-mentioned secondary cell 1, to the charger that is used for above-mentioned secondary cell 1 charging that connects this Battery pack E, the control signal of its charging action of output control.Particularly, as can be safely to the charging safety requirements of lithium ion cell charging, as above-mentioned (recommendation) temperature range of regulation as shown in Figure 7, charging control section 5 can be to the temperature province of above-mentioned secondary cell 1 charging, for example being divided into, 0～45 ℃ normal temperature district and 45～60 ℃ high-temperature district set, in humidity province in addition, forbid secondary cell 1 charging.
Whether more particularly be exactly, whether the temperature T of 5 pairs of above-mentioned secondary cells 1 of above-mentioned charging control section is that (T≤0 ℃) is judged below 0 ℃, and be more than 60 ℃ (60 ℃≤T) judge to the temperature T of above-mentioned secondary cell 1.Then, satisfying under the situation of these decision conditions, forbidding the charging of above-mentioned secondary cell 1; Under the invalid situation of above-mentioned decision condition, just allow under the situation of secondary cell 1 charging, be to judge to the temperature T of secondary cell 1 in above-mentioned normal temperature district or in the high-temperature region.This judgement is for example carried out in the following manner, the temperature T of promptly judging this secondary cell 1 whether more than 45 ℃ (45 ℃≤T).So tightly, above-mentioned normal temperature district is set to 1～44 ℃ (0 ℃＜T＜45 ℃); The high-temperature district is set to 45～59 ℃ (45≤T＜60 ℃).
In addition, owing to can carry out the charging voltage upper limit and the maximum charging current of safe charging to lithium ion battery, set according to the above-mentioned battery temperature scope of distinguishing as shown in Figure 8 respectively, so, the recommendation charging voltage that above-mentioned charging control section 5 will be set respectively based on the charging voltage upper limit of each humidity province is as the threshold value of the cell voltage (cell voltage) of judging secondary cell 1.Particularly be exactly, will be made as decision threshold based on the standard recommendation charging voltage (for example 4.20V/cell) of this charging voltage upper limit (4.25V/cell) decision in the normal temperature district; In the high-temperature district, the high temperature that will determine based on the charging voltage upper limit (4.15V/cell) in this high-temperature district recommends charging voltage (for example 4.10V/cell) to be made as decision threshold.
And, charging control section 5 is controlled above-mentioned charging in such a way, that is: in above-mentioned normal temperature district, terminal voltage (cell voltage) at above-mentioned secondary cell 1 surpasses under the situation of above-mentioned standard recommendation charging voltage (for example 4.20V/cell), think that this secondary cell 1 near being full of electricity condition, limiting its maximum charging current and charges; In the high-temperature district, recommend above above-mentioned high temperature under the situation of charging voltage (for example 4.10V/cell) at the terminal voltage (cell voltage) of above-mentioned secondary cell 1, limit its charging voltage to secondary cell 1 charging.
In other words, the logical circuit 5a of above-mentioned charging control section 5 is according to the terminal voltage (cell voltage) and the battery temperature of secondary cell 1, as shown in Figure 2, at battery temperature T (T≤0 ℃ or 60 ℃≤T) not under the situation in normal temperature district and high-temperature district, be not limited to the terminal voltage of above-mentioned secondary cell 1, be set at the situation [charging illegal state: 4] of forbidding this secondary cell 1 charging.
In addition, above-mentioned logical circuit 5a is at the battery temperature T of above-mentioned secondary cell 1 under the situation in normal temperature district (0 ℃＜T＜44 ℃), and the terminal voltage (cell voltage) of this secondary cell 1 and above-mentioned threshold value (standard recommendation charging voltage) are compared judgement.And, surpass above-mentioned standard recommendation charging voltage (for example 4.20V/cell) before at above-mentioned terminal voltage (cell voltage) V, be set at the situation [charging License Status: 1] that permission is charged usually by constant-current constant-voltage charging; Under above-mentioned terminal voltage (cell voltage) V surpasses the situation of above-mentioned standard recommendation charging voltage, will be set at 1/2 the situation [electric current restriction state: 2] of its charge-current limit at for example above-mentioned maximum charging current.
In addition, above-mentioned logical circuit 5a is at the battery temperature T of above-mentioned secondary cell 1 under the situation in high-temperature district (45 ℃＜T＜59 ℃), and the terminal voltage (cell voltage) of this secondary cell 1 and above-mentioned threshold value (high temperature recommendation charging voltage) are compared judgement.And, surpass above-mentioned high temperature at above-mentioned terminal voltage (cell voltage) V and recommend charging voltage (for example 4.10V/cell) before, be set at the situation [charging License Status: 1] that permission is charged usually by constant-current constant-voltage charging; Surpassing high temperature at terminal voltage (cell voltage) V recommends to be set at the situation [voltage limit state: 3] that limits its charging voltage under the situation of charging voltage.
In addition, output circuit 5b in the above-mentioned charging control section 5 accepts the judgement output result's (situation) from above-mentioned logical circuit 5a, and generation for example shown in Figure 3 is according to each situation and the control signal of definite voltage level, with it from above-mentioned control terminal CHG output.In addition, at the situation of the above-mentioned charging illegal state of expression [4], above-mentioned output circuit 5b is set at the voltage of this control signal and makes above-mentioned old-fashioned charger D can be used as temperature anomaly (high temperature abnormality) the highest detected voltage (for example 1.7V).Situation at the above-mentioned electric current restriction state of expression [2], because be secondary cell 1 near the state that is full of electricity, make above-mentioned old-fashioned charger D can be used as temperature anomaly (low temperature abnormality) detected minimum voltage (for example 0V) so the voltage of this control signal is set at.
Further, above-mentioned output circuit 5b generates and makes old-fashioned charger D conduct charging permission detected voltage, for example 1.5V conscientiously at the situation of the above-mentioned charging License Status of expression [1].In addition, the situation at expression voltage limit state [3] generates for example 1.3V.
For the control signal of representing these 4 kinds of situations respectively; its mutually different each voltage is to consider following situation decision; that is: constituting the microcomputer of above-mentioned charging control section 5 and the driving voltage of protection IC is to change in the scope of for example 3～5V, and its inner basis of reference voltage is set to for example 2.3V.In addition, corresponding which kind of voltage of which kind of situation is that the detection characteristic (operating characteristics) of considering above-mentioned old-fashioned charger D determines.Therefore, undoubtedly, under the movement standards of charging control section 5 situation different, at least at charging illegal state [4] and electric current restriction state [2] with above-mentioned example, forbid as long as make old-fashioned charger D it can be judged to be charging, connect and to decide each voltage level according to this specification.In addition, the magnitude relationship of the voltage level of corresponding each situation can certainly be reversed and set.
In addition, for the output circuit 5b that generates the control signal of setting as mentioned above, shown in for example can image pattern 4 like that, carry out dividing potential drop by 51 pairs of supply voltages of resistor ladder (internal reference voltage), generate 1.7V, 1.5V, 1.3V, via the output of accepting above-mentioned logical circuit 5a and select the switching circuit 52 of a conducting, the output of resistor ladder 51 is selected, via output buffer 53, this voltage is exported to the outside.
Perhaps, shown in for example also can image pattern 5 like that, make the output of logical circuit 5a become the signal that carries out pulse width modulation (PWM modulation) according to above-mentioned each situation, at level shift circuit 54, convert the voltage corresponding to this pulse duration, via output buffer (FET) 55 with its output.In this case, for example preferred pull-up resistor R that is located at charger B, D side that utilizes, the electric capacity 56 that externally is located on the output circuit 5b charges, and this charging voltage is exported to the outside.
Like this, as mentioned above, with battery temperature 4 different control signals of above-mentioned voltage level are selected a Battery pack of exporting according to terminal voltage (cell voltage) according to secondary cell 1, with the corresponding charger B of above-mentioned specification in, for example as shown in Figure 6, only the control signal of decision set battery side output just can guarantee the fail safe of Battery pack, can control the charging of this Battery pack simultaneously in simple mode.
Particularly, the state＜step S1～S4 of the control signal of charger B decision set battery output 〉,, just interrupt charging＜step S5 to secondary cell 1 if control signal is state [4] 〉; If control signal is state [1], just according to the state of this moment, control is to the charging＜step S6 of secondary cell 1 〉.Specifically, if charge usually, then continue charging usually; If charging is interrupted, then recover charging.In addition,, then restore its charging voltage, charge usually if voltage charged when descending.
In addition, if control signal is state [2], then limits charging current and charge＜step S7 〉; If be state [3], then limit charging voltage and charge＜step S8 〉.More than handle repeatedly and carry out, until detecting secondary cell 1〉for being full of electricity＜step S9.In addition,, for example judge＜step S10 by open terminal voltage OCV to this secondary cell 1 if the charging of secondary cell 1 finishes, judge that with this secondary cell 1 is charged normal, finish the back that still overcharges.
Therefore, according to above-mentioned charging control, Battery pack will be as example as shown in Figure 7, according to its battery temperature T and terminal voltage limit charging current and on one side charge on one side.Particularly, if when under normal temperature state (for example 10 ℃＜T＜44 ℃), beginning the charging of secondary cell 1, charge usually by above-mentioned constant-current constant-voltage charging according to the above-mentioned secondary cell 1 of situation [1] of charging permission.Follow this charging, the terminal voltage of secondary cell 1 (cell voltage) rises gradually, and in addition, shown in Fig. 7 dotted line, the relative charging capacitor RCOC of secondary cell 1 also rises gradually.
In addition, when secondary cell 1 was arrived certain degree by trickle charge, himself is heating thereupon, causes the temperature T of this secondary cell 1 to rise gradually, and the terminal voltage of secondary cell 1 (cell voltage) also rises gradually.In such charging process, when the terminal voltage of secondary cell 1 reached above-mentioned standard recommendation charging voltage (for example 4.20V/cell), from the situation [2] of Battery pack output current restriction, thereby charger was accepted this output restriction charging current.For example 0.7 times by the charging current before its charging current is set at carries out this electric current restriction.So the self-heating of secondary cell 1 will be inhibited with the restriction of this charging current, how many temperature of this secondary cell 1 is reduced.Its result, battery temperature is maintained at the low temperature district, and terminal voltage also is in below the above-mentioned standard recommendation charging voltage, and thus, above-mentioned situation will be got back to [1] of indication charging permission.And secondary cell 1 charges with the charging current (confined charging current) of new settings.
Yet, because at this moment secondary cell 1 has been charged to certain degree, so even charge under above-mentioned electric current restriction, its terminal voltage also can reach the standard recommendation charging voltage within a short period of time.Therefore, once more above-mentioned condition is changed in the Battery pack [2], charger is sent the instruction of electric current restriction.Its result, charger can reduce above-mentioned charge capacity once more, follows in this battery temperature to descend, because terminal voltage also descends, therefore makes situation be changed to [1] once again in addition, continues the charging of secondary cell 1.After, whenever the terminal voltage of secondary cell 1 reaches the standard recommendation charging voltage,, above-mentioned charging current is reduced with regard to output situation [2].
In addition, though Fig. 7 does not have illustration, the temperature of above-mentioned secondary cell 1 surpasses under 45 ℃ the situation in above-mentioned charging process, makes its output situation [3], sends the instruction of restriction charging voltage.In addition, this charging voltage is inhibited because of limiting, this cell voltage is back under the situation in low temperature district in the heating of above-mentioned secondary cell 1, and secondary cell 1 can continue charging once more under above-mentioned electric current restriction.In addition, the charging current of secondary cell 1 for the set point of regulation below and its terminal voltage reach under the situation of set point of regulation, this is judged to be secondary cell 1 has reached and be full of electricity, and stop this charging.
Like this, according to following charging control, promptly one side is according to the battery temperature and the terminal voltage of secondary cell 1, charge condition is carried out variable setting, on one side secondary cell 1 is charged, just can surpass 45 ℃ time point at battery temperature, limit this charging voltage itself, and when terminal voltage surpasses setting voltage, limit its charging current, so, on one side the temperature of secondary cell 1 is remained on below 45 ℃, Yi Bian stably secondary cell 1 is charged until being full of.And, Yi Bian owing to be to reduce charging current by stages,, can judge correctly that it is full of the effect of electricity etc. so also have Yi Bian secondary cell 1 is charged.
In addition, under above-mentioned Battery pack and situation that the old type charger D that does not have above-mentioned charge condition controlled function is connected, only judge in this charger D whether the voltage level of the control signal that obtains from Battery pack satisfies charging permissive condition shown in Figure 3.In addition, be that the temperature of state [4], secondary cell 1 is under the situation of high temperature abnormality in the indication control signal, charger D can end the charging of secondary cell 1 rapidly.In addition, under the situation of control signal for the state [2] of expression electric current restriction, charger D can look for the temperature of secondary cell 1 is to hang down temperature abnormality, thereby end its charging.In addition, charger D is under the situation of the state [1] of expression charging permission or the state [3] of representing voltage limit in above-mentioned control signal only, to above-mentioned secondary cell 1 implementation charging.
Therefore,, from needless to say,, also can appropriately export charging control indication when being connected to, control its charging safely this charger B, D even be connected under the situation of old type charger D with the corresponding charger B of above-mentioned specification according to the Battery pack that constitutes as mentioned above.In addition, concerning the charger side, owing to can make the Battery pack side bear above-mentioned charging control, so realized the simplification etc. of its control on the effect.
Further, according to Battery pack of the present invention, as mentioned above, because only according to the terminal voltage (cell voltage) and the battery temperature of secondary cell 1, select 4 different control signals of an output-voltage levels, control above-mentioned charge condition, so the effect that the thermistor terminal TM that can make 1 above-mentioned control terminal CHG have existing Battery pack concurrently is born.In other words, in old type charger D, above-mentioned control terminal CHG can be considered as thermistor terminal TH, carry out above-mentioned charging control.So the present invention has does not increase the number of terminals that is arranged on the Battery pack, make terminal bear the effect of multiple action etc.
In addition, the invention is not restricted to above-mentioned execution mode.The voltage level of representing the control signal of above-mentioned 4 states is as long as formulate according to its specification.About the corresponding relation between 4 states and the voltage level, it is enough as long as the detection characteristic (detection specification) of the old type charger of consideration is set.In addition, illustrative here is charging to lithium ion battery, and the present invention is equally applicable to the charging control of the secondary cell of other types.
In addition, illustrate in above-mentioned background technology that low temperature district (0～10 ℃) that for example can be in normal temperature is made as 1.0C with the maximum charging current of secondary cell; (10～60 ℃) are made as 1.5C with it beyond the low temperature district.In this case, (0～10 ℃) reduces its charging current in the low temperature district.The reduction of relevant this electric current as mentioned above, both can be limited in this charging current one free burial ground for the destitute originally 1/2, also may be limited to about 2/3 original (for example, being reduced to 1.0C from 1.5C).
In addition, can certainly not carry out a free burial ground for the destitute and reduce charging current, but as illustrating with reference to Fig. 7, reduction along with charging current, whenever reaching assigned voltage, the voltage of secondary cell 1 (battery unit) (for example, 4.20V/cell), just reduces this current value interimly.In this case, as long as about 0.7 times of current value before for example current value being limited in.In addition, what illustrate here is the example of the control signal of 4 situations of output, temperature range further can certainly be segmented, and the terminal voltage scope is further segmented.
In addition, though above-mentioned execution mode has illustrated control terminal CHG by the situation of drawing on resistance 9a, the R, present embodiment is equally applicable to this control terminal CHG by the drop-down situation of resistance.In addition, for output logic, can certainly specifically set for reverse with output-voltage levels via the situation of control terminal CHG.In addition, the present invention can carry out various forms and implements in the scope that does not break away from its main contents.
Claims (7)
1. a Battery pack is characterized in that,
Possess: secondary cell;
Voltage detection mechanism detects the terminal voltage of this secondary cell;
Temperature testing organization detects the temperature of described secondary cell;
Logical circuit according to the terminal voltage and the temperature of the detected described secondary cell of these each testing agencies' difference, is distinguished a plurality of charge conditions that are used for described secondary cell safe charging; With
Output circuit according to the output of this logical circuit, is selected one from the control voltage of the mutually different a plurality of grades of voltage level, offer the charger to described secondary cell charge,
Described logical circuit is according to the terminal voltage and the temperature of the detected described secondary cell of described each testing agency's difference, from a plurality of charge conditions, select one, described a plurality of charge condition is formulated according to following combination in advance, promptly in advance the terminal voltage of described secondary cell is distinguished into a plurality of grades voltage zone, with the combination that in advance humidity province that can charge of described secondary cell is distinguished into the humidity province of a plurality of grades.
2. Battery pack according to claim 1 is characterized in that,
Described logical circuit is according to the terminal voltage and the temperature of the detected described secondary cell of described each testing agency's difference, from 4 charge conditions, select 1, described 4 charge conditions are formulated according to following combination in advance, promptly in advance the terminal voltage of described secondary cell is distinguished into 3 grades voltage zone, with the combination that in advance humidity province that can charge of described secondary cell is distinguished into the humidity province of 2 grades.
3. Battery pack according to claim 2 is characterized in that,
2 humidity provinces can charging of described secondary cell are normal temperature district and high-temperature district,
Distinguishing the voltage threshold in described 3 voltage gradation districts, is that the standard recommendation charging voltage in described normal temperature district and the high temperature that is lower than the described high-temperature district of this standard recommendation charging voltage formulation are recommended charging voltage,
Described logical circuit is selected one from the output signal of representing various states, generate as described control signal, described various state is: the temperature of described secondary cell is forbidden the charging illegal state that described secondary cell is charged beyond described normal temperature district and high-temperature district the time; The temperature of described secondary cell when described standard recommendation charging voltage is above, limits the charging current of described secondary cell at the terminal voltage of described normal temperature district and described secondary cell, allows the electric current restriction state that charges; The temperature of described secondary cell when this high temperature recommends charging voltage above, limits the charging voltage of described secondary cell at the terminal voltage of described high-temperature district and described secondary cell, allows the voltage limit state that charges; Under the situation in addition, allow the charging License Status that described secondary cell is charged with the recommendation charging voltage in relevant temperature district.
4. Battery pack according to claim 3 is characterized in that,
Described output signal is that the output signal of described logical circuit is output as the voltage that its voltage level ladder of order according to described charging illegal state, described charging License Status, described voltage limit state and described electric current restriction state descends.
5. Battery pack according to claim 1 is characterized in that,
Described secondary cell is the battery that a plurality of lithium ion battery connection in series-parallel are connected,
Described voltage detection mechanism detects the cell voltage of described lithium ion battery.
6. a charging system is characterized in that,
Form with the charger that described secondary cell is charged that links to each other with this Battery pack by any described Battery pack in the claim 1～5,
Described charger possesses the charging controlling organization, and this charging controlling organization judges that to the level of the control voltage that described Battery pack provides restriction puts on the charging voltage and/or the charging current of described secondary cell.
7. a charging system is characterized in that,
Form with the charger that described secondary cell is charged that links to each other with this Battery pack by any described Battery pack in the claim 1～5,
Described charger is imported the control voltage that described Battery pack provides as the temperature information of described secondary cell, when the level of described control voltage is not in by the voltage range of predefined upper voltage limit and lower voltage limit defined, think that the temperature of described secondary cell is not in can the humidity province to this secondary cell charge, stop the charging of described secondary cell
When the charge condition that the described output circuit in the described Battery pack is selected at described logical circuit is forbidden for charging and/or during the restriction charging current, output is by the control voltage of the voltage level beyond the voltage range of described upper voltage limit and lower voltage limit regulation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009261884A JP2011109802A (en) | 2009-11-17 | 2009-11-17 | Battery pack and charging system |
| JP2009-261884 | 2009-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102064570A true CN102064570A (en) | 2011-05-18 |
Family
ID=43999733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105090152A Pending CN102064570A (en) | 2009-11-17 | 2010-10-12 | Assembled battery and charging system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2011109802A (en) |
| CN (1) | CN102064570A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135456A (en) * | 2011-11-14 | 2013-06-05 | 联发科技股份有限公司 | Method and apparatus for performing charging port detection control |
| CN103531858A (en) * | 2012-07-03 | 2014-01-22 | 上海汽车集团股份有限公司 | Stepping battery charging method and stepping battery charging device |
| CN104348224A (en) * | 2013-08-07 | 2015-02-11 | 神钢建机株式会社 | Electric power control apparatus |
| CN105337265A (en) * | 2014-06-30 | 2016-02-17 | 南京德朔实业有限公司 | Discharge protection circuit and control method thereof |
| CN109278588A (en) * | 2018-10-24 | 2019-01-29 | 重庆长安汽车股份有限公司 | A method of control lithium battery temperature |
| CN112054477A (en) * | 2019-06-05 | 2020-12-08 | 凹凸电子（武汉）有限公司 | Threshold setting circuit, battery protection system and battery protection method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9209637B2 (en) | 2013-03-15 | 2015-12-08 | Kabushiki Kaisha Toshiba | Battery control apparatus |
| EP2782206B1 (en) * | 2013-03-19 | 2017-03-08 | Kabushiki Kaisha Toshiba | Battery control device |
| KR101509895B1 (en) * | 2013-06-28 | 2015-04-06 | 현대자동차주식회사 | Method for limiting power of battery |
| JP6265215B2 (en) * | 2013-11-01 | 2018-01-24 | 日本電気株式会社 | Charging device, power storage system, charging method and program |
| CN110365074B (en) * | 2016-09-20 | 2022-02-11 | 华为技术有限公司 | Battery, terminal and charging system |
| JP6583294B2 (en) | 2017-01-17 | 2019-10-02 | トヨタ自動車株式会社 | Electric vehicle |
| JP7419258B2 (en) * | 2018-11-26 | 2024-01-22 | 株式会社半導体エネルギー研究所 | Secondary battery system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264202A (en) * | 1999-01-11 | 2000-08-23 | 索尼公司 | Battery charger |
| CN101345432A (en) * | 2007-07-13 | 2009-01-14 | 三洋电机株式会社 | Method of charging a battery array |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009017703A (en) * | 2007-07-05 | 2009-01-22 | Mitsumi Electric Co Ltd | Charge control circuit of secondary battery and charge control device using the circuit |
| JP2009022078A (en) * | 2007-07-10 | 2009-01-29 | Sanyo Electric Co Ltd | Method of charging lithium-ion secondary battery |
| JP2009153238A (en) * | 2007-12-18 | 2009-07-09 | Mitsumi Electric Co Ltd | Portable device and battery pack used for the same |
-
2009
- 2009-11-17 JP JP2009261884A patent/JP2011109802A/en active Pending
-
2010
- 2010-10-12 CN CN2010105090152A patent/CN102064570A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264202A (en) * | 1999-01-11 | 2000-08-23 | 索尼公司 | Battery charger |
| CN101345432A (en) * | 2007-07-13 | 2009-01-14 | 三洋电机株式会社 | Method of charging a battery array |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135456A (en) * | 2011-11-14 | 2013-06-05 | 联发科技股份有限公司 | Method and apparatus for performing charging port detection control |
| US9142982B2 (en) | 2011-11-14 | 2015-09-22 | Mediatek Inc. | Method and apparatus for performing charging port detection control |
| CN103135456B (en) * | 2011-11-14 | 2016-04-06 | 联发科技股份有限公司 | Charging port detecting control method and charging port detecting control device |
| US9923390B2 (en) | 2011-11-14 | 2018-03-20 | Mediatek Inc. | Method and apparatus for performing charging port detection control |
| CN103531858A (en) * | 2012-07-03 | 2014-01-22 | 上海汽车集团股份有限公司 | Stepping battery charging method and stepping battery charging device |
| CN103531858B (en) * | 2012-07-03 | 2015-11-18 | 上海汽车集团股份有限公司 | Battery stepping charge control method and battery stepping charging device |
| CN104348224A (en) * | 2013-08-07 | 2015-02-11 | 神钢建机株式会社 | Electric power control apparatus |
| CN104348224B (en) * | 2013-08-07 | 2018-08-31 | 神钢建机株式会社 | Power control unit |
| CN105337265A (en) * | 2014-06-30 | 2016-02-17 | 南京德朔实业有限公司 | Discharge protection circuit and control method thereof |
| CN105337265B (en) * | 2014-06-30 | 2018-10-02 | 南京德朔实业有限公司 | Discharge protection circuit and control method thereof |
| CN109278588A (en) * | 2018-10-24 | 2019-01-29 | 重庆长安汽车股份有限公司 | A method of control lithium battery temperature |
| CN112054477A (en) * | 2019-06-05 | 2020-12-08 | 凹凸电子（武汉）有限公司 | Threshold setting circuit, battery protection system and battery protection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011109802A (en) | 2011-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102064570A (en) | Assembled battery and charging system | |
| CN101083402B (en) | Method of charging a rechargeable battery and protection circuit for a rechargeable battery | |
| CN102163755B (en) | Rechargeable battery charging method, rechargeable battery charge controlling device and battery pack | |
| CN1129223C (en) | Fail Safe circuit and battery pack using same | |
| EP2418751B1 (en) | Battery charger and battery charging method | |
| US8436588B2 (en) | Method of charging a battery array | |
| CN101421902B (en) | Charging method and battery pack | |
| CN101816092B (en) | Secondary cell charge control method and charge control circuit | |
| EP2919029B1 (en) | Battery monitoring device | |
| US6222346B1 (en) | Battery protection device | |
| KR20080103397A (en) | Battery pack and battery protection method | |
| CN102751749B (en) | Charging finishing time determines that method, charging finishing time determine device and battery component | |
| EP2760094A1 (en) | Switch device and breaker control method | |
| EP2988384B1 (en) | Overcharge protection apparatus with minimized power consumption | |
| US9780592B2 (en) | Battery pack for selectively setting a high capacity mode having a high charge capacity until a full charge of a secondary battery | |
| KR20120028296A (en) | Charging device | |
| EP3006946B1 (en) | Storage battery monitoring device | |
| JP2009178014A (en) | Charger | |
| CN102077440A (en) | Charging system and battery pack | |
| CN102005787A (en) | Charging and discharging control circuit and charging type power supply device | |
| JP2014018034A (en) | Battery pack | |
| JP3988797B2 (en) | Secondary battery protection device | |
| JP2003092840A (en) | Battery pack controller | |
| JP2008259386A (en) | Battery protection circuit and battery pack | |
| US11824392B2 (en) | Battery pack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110518 |