CN202948992U - Parallel-connection change-over switch of lithium-ion battery packs - Google Patents
Parallel-connection change-over switch of lithium-ion battery packs Download PDFInfo
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- CN202948992U CN202948992U CN2012205346835U CN201220534683U CN202948992U CN 202948992 U CN202948992 U CN 202948992U CN 2012205346835 U CN2012205346835 U CN 2012205346835U CN 201220534683 U CN201220534683 U CN 201220534683U CN 202948992 U CN202948992 U CN 202948992U
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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
Abstract
The utility model relates to a parallel-connection change-over switch of lithium-ion battery packs, which is used for realizing the series connection and parallel connection of the lithium-ion battery packs in use. Two lithium-ion battery packs which have the same capacity are safe and reliable when being in use, and requirements on each battery pack are low. The terminal voltage of the two lithium-ion battery packs is required to be the same when the two lithium-ion battery packs which have the same capacity are changed to be in parallel connection, and when the terminal voltage of the two lithium-ion battery packs is different, and the two lithium-ion battery packs are connected in parallel, the high-voltage lithium-ion battery pack charges the low-voltage lithium-ion battery pack, and large amounts of current generate so as to result in insecurity. According to the parallel-connection change-cover switch, as a positive electrode of each lithium-ion battery pack and a diode are in series connection and forward connection, the two lithium-ion battery packs can not charge each other, so that safety and reliability are realized.
Description
Technical field
The utility model relates to the using method of lithium ion battery group, relates in particular to the using method in parallel of lithium ion battery group.
Background technology
Paper: a guest, Guo Lian converts, Cui Zhongbin, Xie Yongcai. the voltage characteristic of used for electric vehicle power lithium-ion battery [J]. and battery industry, 2009,14 (6): 398-403.A kind of LiMn of being conceived to is disclosed
2O
4Lithium ion battery and LiFePO
4Lithium ion battery take 4 kinds of domestic power lithium-ion batteries as object, has carried out test and study to its voltage characteristic in the application in electric powered motor field.Result of study shows: LiMn
2O
4Lithium ion battery and LiFePO
4The voltage characteristic of lithium ion battery has marked difference; Low temperature is to LiFePO
4The voltage characteristic of lithium ion battery has a significant impact; The PNGV model is applicable to LiFePO
4The voltage characteristic emulation of lithium ion battery under dynamic pulse electric current operating mode.
Due to the existence of battery concentration polarization and electrochemical polarization phenomenon, lithium-ion battery monomer constant-current discharge process voltage is always lower than OCV (open circuit voltage); In the constant current charge process, the voltage height overall is in OCV; The highest cut-ff voltage 4.2V.3.3V50Ah the internal resistance of lithium ion battery is less than 5m Ω; 3.3V150Ah the internal resistance of lithium ion battery is less than 1.5m Ω.
Paper: just super, neat platinum, Du Xiaowei. electric automobile lithium ion battery group discordance analysis [J]. scientific and technical innovation Leader, 2009 (25): 112-113.Disclosing a kind of lithium ion battery inconsistency is the important indicator that affects its use, be to analyze the inconsistency of lithium battery, 8Ah lithium ion battery group is carried out under normal temperature, 1C, 2C, 3C, 4C discharge and recharge experiment.Experimental result shows: the inconsistency of lithium battery group is apparent in view; A kind of method based on the whole dispersion of lithium battery group and monomer dispersion analysis lithium battery group inconsistency has been proposed.
When the ceiling voltage of cell reached 4.3V, charging stopped.When in battery pack, the minimum voltage of cell reached 3V, discharge stopped.
Paper: Xu Kecheng, the Changqing, osmanthus. the difference of lithium ion single battery and battery pack [J]. battery, 2011,41 (6): 315-318.The specific energy that discloses a kind of low capacity lithium ion single battery reaches 140Wh/kg, and the cycle life of extrapolated forecasting method reaches 1000 times, and the large-capacity power type lithium ion battery pack is far short of what is expected by comparison.Reason is: lithium ion battery is responsive to end of charge voltage, and final voltage differs 2.4% will cause the variation that battery pack cycle life is very large; In battery pack, the difference of cell can only reduce and can not eliminate.The key that solves above-mentioned difference is not packaging technology, but will strengthen the basic research of lithium ion battery.
Paper: Yu Shenjun, Zhou Yongchao, Lee congratulates, Chen Zhikui. the impact [J] of internal resistance difference on lithium ion battery group security performance. Journal of Chemical Industry and Engineering, 2010,61 (11): 2960-2964.A kind of impact of internal resistance difference on different connected mode lithium ion battery group security performances of having studied disclosed.Test result shows, along with increasing of cycle-index, the internal resistance value of internal resistance difference battery increases gradually, and case temperature raises gradually, and discharge capacity constantly decays, and then causes the resistance otherness constantly to increase, and finally this battery lost efficacy.Failure cause is the phenomenon of overcharging that this monocell that the internal resistance value difference causes occurs.Studies show that, internal resistance difference is the key factor that affects the battery pack security performance.Compare with other monocells, the security performance of the monocell that in battery pack, internal resistance difference is larger is poorer, and in connected mode, the security performance of parallel way is better than series system.
Application number is 201010229566.3, denomination of invention discloses a kind of battery pack and grouping method thereof, electric motor car for the patent of " battery pack and grouping method thereof, electric motor car ".Wherein, this battery pack comprises two above battery cells, also comprises: electrode connecting parts is connected between the pole of each battery cell; Signal processing circuit board is arranged on two above battery cell places, and is connected in electrode connecting parts; Central management unit is connected with signal processing circuit board.By the present invention, can make the more compact structure of battery pack.
The battery pack of using on electric automobile is all generally cell to be carried out connection in series-parallel use, improve voltage, increase capacity and satisfy instructions for use to reach, in existing published technical scheme, the electrokinetic cell that uses on electric automobile has lead-acid battery, lithium battery, described lithium battery is lithium ion battery, and ferric phosphate lithium cell etc. is arranged, battery pack adopts the fixing mode of operation of a kind of syndeton, in the course of the work battery pack is no longer carried out connection in series-parallel and reconfigures.Lithium ion battery group of the present utility model change over switch in parallel is used for realizing that lithium ion battery group series, parallel in use connects; The use of can connecting in use of two identical lithium ion battery groups of capacity, safety, reliable, less demanding to each battery pack; The identical lithium ion battery group of two capacity is when being transformed in parallel the use, requirement to each battery pack is very high, require the terminal voltage of described two battery pack identical, if the terminal voltage of described two lithium ion battery groups is not identical, when parallel connection, high-tension lithium ion battery group can produce large electric current to the lithium ion battery group charging of low-voltage, brings insecurity; The utility model adopts the anodal series diode of each lithium ion battery group, forward connects, and makes between two lithium ion battery groups and can not charge mutually, has realized safe, reliable in work.
The utility model content
The purpose of this utility model is that electric automobile requires voltage high when running at high speed; When low speed driving, require voltage low, and realize that the method for low-voltage is by the copped wave to constant-direct current voltage, constant direct current is chopped into pulse direct current, the galvanic duty of regulating impulse is recently realized the requirement of transformation; The battery pack that the utility model uses is the series connection of the identical battery pack of two block specifications, when duty ratio is 50% left and right, output voltage is that the effective value of the operating voltage on motor is half left and right of the series voltage of the identical battery pack of described two block specifications, the voltage that is about the monoblock battery group, voltage when being about the identical battery pack of described two block specifications in parallel, current peak is about 2 times of effective value of electric current, ripple contain factor occurs; When adopting the identical battery pack of described two block specifications in parallel, when duty ratio is 100%, output voltage is the voltage of the operating voltage on motor when being about the identical battery pack of described two block specifications in parallel, also the voltage of described monocell group, current peak is the effective value of electric current, the pulse free factor.Therefore, when the effective value of motor operating voltage during lower than the voltage of described monocell group, can be by adopting the parallel connection of the identical battery pack of described two block specifications, increased duty ratio, the peak value of motor lines electric current is just little, and the ripple contain factor of electromagnetic force is just little, has reduced ripple contain factor.When electric automobile travelled at the large load of low speed, as operating modes such as starting, climbings, requirement was, low speed, large torque are large electric current, and the operating mode that realizes low speed is exactly low-voltage.So when the low speed operating mode, adopt the parallel connection of battery pack to make to obtain low-voltage; For two identical lithium ion battery groups, its internal resistance is very little, normally several milliohms, when being connected in parallel, when the voltage of two battery pack not simultaneously, the batteries charging that the battery pack that voltage is large is low to voltage, can produce large electric current, power-supply management system was lost efficacy and produce dangerous.When adopting lithium ion battery group of the present utility model change over switch in parallel to carry out being connected in parallel of battery pack, just can not produce the charging phenomenon between battery, both protect battery pack, satisfy again the requirement of using.
To achieve these goals, the utility model is by the following technical solutions:
a kind of lithium ion battery group change over switch in parallel, by switch, diode forms, it is characterized in that, two ends of switch connect binding post, two ends of battery pack connect binding post, two ends of diode connect binding post, described battery pack is the identical battery pack E1 of two block specifications, battery pack E2, described diode is diode D1, diode D2, the positive pole of battery pack E1 connects the anode of diode D1 by K switch 4, the positive pole of battery pack E2 connects the anode of diode D2 by K switch 5, diode D1, the negative electrode of diode D2 all is connected to the upper output that forms of binding post W2, the negative pole of described battery pack E1 connects the positive pole of battery pack E2 by K switch 2, the positive pole of described battery pack E1 is connected on binding post W2 by K switch 6, and the positive pole of described battery pack E2 is connected on binding post W2 by K switch 7, the negative pole of described battery pack E1 is connected by K switch 3 with the negative pole of described battery pack E2.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: described battery pack E1 is the lithium ion battery group, described battery pack E2 is the lithium ion battery group.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: the negative pole of described battery pack E2 is connected to earth terminal.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: described switch is change over switch, relay, noncontacting switch, contact switch or knife switch.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: described diode D1 is that negative electrode is connected with described diode D2.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: for described battery pack E1 and described battery pack E2 being connected by described diode D1 and described diode D2, described diode D1 and described diode D2, one is forward, another is reverse.
Change over switch in parallel according to described lithium ion battery group is characterized in that: described battery pack E1 and described battery pack E2, owing to connecting by diode and can not mutually charging, can only discharge.
Change over switch in parallel according to described lithium ion battery group is characterized in that: described K switch 6 and the branch circuit parallel connection of K switch 4 through diode D1; Described K switch 7 and the branch circuit parallel connection of K switch 5 through diode D2.
Change over switch in parallel according to described lithium ion battery group, it is characterized in that: the electric current that described K switch 6 is passed through is large, and K switch 4 is little with the electric current of diode D1; The electric current that described K switch 7 is passed through is large, and K switch 5 is little with the electric current of diode D2.
The utility model has the advantages of:
Lithium ion battery group of the present utility model change over switch in parallel, when the identical lithium ion battery group parallel connection of described two block specifications, and terminal voltage is not when identical, the lithium ion battery group that voltage is high is charged to the low lithium ion battery group of voltage, when charging, the lithium ion battery group that described two block specifications are identical always have one to be Opposite direction connection in two diodes, so can not be charged mutually; When connecting load, the lithium ion battery group that two block specifications are identical is respectively load discharge, is far longer than the internal resistance of battery pack due to the resistance of load, makes the terminal voltage of described two battery pack near identical; Turn on-switch K6, K switch 7, because the forward drop of diode D1, diode D2 is greatly about about 0.7V, the contact resistance of switch is very little, so diminish by the electric current of diode D1, diode D2, most of electric current is by K switch 6, K switch 7.When adopting lithium ion battery group of the present utility model change over switch in parallel to carry out being connected in parallel of the identical lithium ion battery group of specification, just can not produce the charging phenomenon between battery, both protect battery pack, satisfy again the requirement of using.
Description of drawings
Fig. 1 is work schematic diagram of the present utility model.
Fig. 2 is the initial work schematic diagrames in parallel of two battery pack of the present utility model.
Fig. 3 is the in parallel schematic diagrames of two battery pack of the present utility model when load is arranged.
In accompanying drawing: 1, binding post W4; 2, battery pack E1; 3, K switch 4; 4, binding post W3; 5, binding post W7; 6, K switch 6; 7, K switch 1; 8, diode D1; 9, binding post W1; 10, binding post W2; 11, diode D2; 12, binding post W8; 13, K switch 7; 14, K switch 5; 15, K switch 2; 16, binding post W6; 17, battery pack E2; 18, K switch 3; 19, binding post W5; 20, earth terminal.
Lithium ion battery group of the present utility model change over switch in parallel, as shown in accompanying drawing 1,2,3, the rated current of binding post W1-binding post W8 is 300A; K switch 4 (3) is change over switch, K switch 6 (6) is change over switch, K switch 1 (7) is change over switch, K switch 7 (13) is change over switch, K switch 5 (14) is change over switch, K switch 3 (18) is change over switch, K switch 2 (15) is change over switch, the rated current of K switch 1-K switch 7 is 300A, described change over switch is relay, noncontacting switch, contact switch or knife switch, the rated current of diode D1, diode D2 is 300A, and reverse voltage is greater than 150V; Described battery pack E1, battery pack E2 are the lithium ion batteries of same size, and the specification of described battery pack E1, battery pack E2 is the 48V150Ah lithium ion battery; Earth terminal 20 is 0 voltage, and earth terminal 20 is minus earth ends.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Assembly relation:
The negative pole of battery pack E1 (2) is connected to binding post W4 (1), and the positive pole of battery pack E1 (2) is connected to binding post W3 (4); The positive pole of battery pack E2 (17) is connected to binding post W6 (16), and the negative pole of battery pack E2 (17) is connected to binding post W5 (19), and binding post W5 (19) is connected to earth terminal 20.
The anodic bonding of diode D1 (8) is to binding post W7 (5), and the negative electrode of diode D1 (8) is connected to binding post W2 (10); The anodic bonding of diode D2 (11) is to binding post W8 (12), and the negative electrode of diode D2 (11) is connected to binding post W2 (10).Diode D1 (8) is connected with diode D2 (11) common cathode, and when two battery pack formed the loop by diode, it was Opposite direction connection that a diode wherein must be arranged.
connecting valve K3 (18) between binding post W4 (1) and binding post W5 (19), connecting valve K2 (15) between binding post W4 (1) and binding post W6 (16), connecting valve K4 (3) between binding post W3 (4) and binding post W7 (5), connecting valve K6 (6) between binding post W3 (4) and binding post W2 (10), connecting valve K1 (7) between binding post W3 (4) and binding post W1 (9), connecting valve K5 (14) between binding post W6 (16) and binding post W8 (12), connecting valve K7 (13) between binding post W6 (16) and binding post W2 (10).
Design principle of the present utility model is as follows:
Battery pack of the present utility model is two 48V150Ah lithium ion battery groups, and the utility model is fit to the parallel connection of the lithium ion battery group of all size; Be particularly suitable for the series and parallel conversion of the lithium ion battery group of electric coach, especially be fit to the series and parallel conversion of two 270V300Ah lithium ion battery groups of electric coach.Electric automobile requires voltage high when running at high speed; When low speed driving, require voltage low, and realize that the method for voltage-regulation is by the copped wave to constant-direct current voltage, constant direct current is chopped into pulse direct current, the galvanic duty of regulating impulse is recently realized the requirement of transformation; When two 48V150Ah lithium ion battery group series connection, the voltage magnitude of power supply is about the direct current of 96V, when duty ratio is 100%, output voltage is that the operating voltage on motor is about 96V, the rotating speed of motor is about 900rpm, the speed of a motor vehicle is about 80km/h, and current peak is the effective value of electric current, the pulse free factor; When duty ratio was 50%, output voltage was that the operating voltage on motor is about 48V, and the rotating speed of motor is about 450rpm, and the speed of a motor vehicle is about 40km/h, and current peak is about 2 times of the effective values of electric current, ripple contain factor occurs; When two 48V150Ah lithium ion battery groups are in parallel, the voltage magnitude of power supply is about the direct current of 48V, when duty ratio is 100%, output voltage is that the operating voltage on motor is about 48V, the rotating speed of motor is about 450rpm, the speed of a motor vehicle is about 40km/h, and current peak is about the effective value of electric current, the pulse free factor.When 2 groups of 48V cell parallels uses, ampere-hour is counted increase and is become two times of relations, and specification is 48V300Ah.When electric automobile travelled at the large load of low speed, as operating modes such as starting, climbings, requirement was that low speed, large torque are large electric current.The voltage balance equation of motor is: U=E+ Δ U+IR
d, U supply voltage (V) in formula, R
dBe effective internal resistance (Ω) of motor, E is average back electromotive force, and Δ U is the total losses voltages, can ignore, and the voltage balance equation of motor is about: U=E+IR
d, be labeled as 1..The rotor of motor when rotated, can the generation back electromotive force be E=K in magnetic field
E2. ω is labeled as, K in formula
EBe the electromotive force coefficient, ω is the angular speed of motor; The output torque is: M
q=K
M3. I is labeled as, K in formula
MBe moment coefficient, I is winding phase current (A), operating current.When not considering dimension, the electromotive force COEFFICIENT K
EEquate with the numerical value of moment coefficient KM.By formula 1., 2. can get, back electromotive force E is that rotating speed is directly proportional to the angular velocity omega of motor, and when low speed, E diminishes, and IR
dBecome large, R
dSubstantially constant, so it is large that electric current I becomes, and 3. can be got torque M by formula
qIncrease, when load was constant, E diminished, and IR
dConstant large, so, can only be that voltage U diminishes.The operating mode that realizes low speed is exactly low-voltage, when described lithium ion battery group series connection, operating voltage is 96V, the duty ratio of pulse voltage is just little, the peak value of motor lines electric current is just large, the ripple contain factor of electromagnetic force is just large, when described lithium ion battery group is in parallel, the battery specification is 48V300Ah, and operating voltage is 48V, and the duty ratio of pulse voltage is just large, the peak value of motor lines electric current is just little, the ripple contain factor of electromagnetic force is just little, so when the low speed operating mode, adopt the parallel connection of battery pack to make to obtain low-voltage; When climbing waits the large load of low speed, require torque M
qGreatly, by 3. being got by formula, electric current I is large, and when being operated in heavy-current discharge, the capacity of 300Ah is better than the capacity of 150Ah.For two identical lithium ion battery groups, the lithium ion battery of 48V150Ah, its internal resistance is very little, and internal resistance＜5m Ω is usually in 2m Ω left and right, the lithium ion battery group of 48V150Ah is being converted to when being connected in parallel, when the voltage difference of two battery pack, as voltage phase difference 1V, when internal resistance is 2m Ω, the momentary charge electric current will be up to 500A, power-supply management system was lost efficacy and makes the battery large current charge and produces danger.When adopting lithium ion battery group of the present utility model change over switch in parallel to carry out being connected in parallel of battery pack, just can not produce the charging phenomenon between battery, both protect battery pack, satisfy again the requirement of using.
lithium ion battery group of the present utility model change over switch in parallel, can be obtained by accompanying drawing 2, for described lithium ion battery group E1 and described lithium ion battery group E2, due to the positive pole of described battery pack all forward connect described diode, described diode D1 is that negative electrode is connected with described diode D2, one is forward, another is reverse, described battery pack E1 and described battery pack E2 because terminal voltage is different by a described battery pack during to another described batteries charging, it is reverse that a described diode is always arranged, so just can not charge, play the effect of protection, the negative electrode of described diode D1 and described diode D2 links together and is connected to the upper output that forms of binding post W2, described battery pack E1 and described battery pack E2 are for described binding post W2, and described diode D1 and described diode D2 are forward conductions.Can be obtained by accompanying drawing 3, described K switch 6 connects binding post W3 and binding post W2, and an end of described K switch 4 connects binding post W3, the other end connects the anode of described diode D1, described diode D1 negative electrode connects binding post W2, like this, and the branch circuit parallel connection of K6 and K4 and D1; Described K switch 7 connects binding post W6 and binding post W2, and an end of described K switch 5 connects binding post W6, and the other end connects the anode of described diode D2, and described diode D2 negative electrode connects binding post W2, like this, and the branch circuit parallel connection of K7 and K5 and D2.Turn on-switch K6, K switch 7, because the forward drop of diode D1, diode D2 is greatly about about 0.7V, the contact resistance of switch is very little, so diminish by the electric current of diode D1, diode D2, most of electric current is by K switch 6, K switch 7.
When adopting lithium ion battery group of the present utility model change over switch in parallel to carry out being connected in parallel of battery pack, just can not produce the charging phenomenon between battery, both protect battery pack, satisfy again the requirement of using.
Claims (9)
1. lithium ion battery group change over switch in parallel, by switch, diode forms, it is characterized in that, two ends of switch connect binding post, two ends of battery pack connect binding post, two ends of diode connect binding post, described battery pack is the identical battery pack E1 of two block specifications, battery pack E2, described diode is diode D1, diode D2, the positive pole of battery pack E1 connects the anode of diode D1 by K switch 4, the positive pole of battery pack E2 connects the anode of diode D2 by K switch 5, diode D1, the negative electrode of diode D2 all is connected to the upper output that forms of binding post W2, the negative pole of described battery pack E1 connects the positive pole of battery pack E2 by K switch 2, the positive pole of described battery pack E1 is connected on binding post W2 by K switch 6, and the positive pole of described battery pack E2 is connected on binding post W2 by K switch 7, the negative pole of described battery pack E1 is connected by K switch 3 with the negative pole of described battery pack E2.
2. lithium ion battery group according to claim 1 change over switch in parallel, it is characterized in that: described battery pack E1 is the lithium ion battery group, described battery pack E2 is the lithium ion battery group.
3. lithium ion battery group according to claim 1 change over switch in parallel, it is characterized in that: the negative pole of described battery pack E2 is connected to earth terminal.
4. lithium ion battery group according to claim 1 change over switch in parallel, it is characterized in that: described switch is change over switch, relay, noncontacting switch, contact switch or knife switch.
5. lithium ion battery group according to claim 1 change over switch in parallel, it is characterized in that: described diode D1 is that negative electrode is connected with described diode D2.
6. lithium ion battery group according to claim 5 change over switch in parallel, it is characterized in that: for described battery pack E1 and described battery pack E2 being connected by described diode D1 and described diode D2, described diode D1 and described diode D2, one is forward, another is reverse.
7. lithium ion battery group according to claim 6 change over switch in parallel is characterized in that: described battery pack E1 and described battery pack E2, owing to connecting by diode and can not mutually charging, can only discharge.
8. lithium ion battery group according to claim 1 change over switch in parallel, is characterized in that: described K switch 6 and the branch circuit parallel connection of K switch 4 through diode D1; Described K switch 7 and the branch circuit parallel connection of K switch 5 through diode D2.
9. lithium ion battery group according to claim 8 change over switch in parallel, it is characterized in that: the electric current that described K switch 6 is passed through is large, and K switch 4 is little with the electric current of diode D1; The electric current that described K switch 7 is passed through is large, and K switch 5 is little with the electric current of diode D2.
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| CN2012205346835U CN202948992U (en) | 2012-10-12 | 2012-10-12 | Parallel-connection change-over switch of lithium-ion battery packs |
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| CN2012205346835U CN202948992U (en) | 2012-10-12 | 2012-10-12 | Parallel-connection change-over switch of lithium-ion battery packs |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916467A (en) * | 2012-10-12 | 2013-02-06 | 刘宗锋 | Parallel connection converting switch of lithium-ion battery pack |
| CN104242401A (en) * | 2014-09-29 | 2014-12-24 | 云南中医学院 | Low-energy-consumption battery pack parallel device |
| CN105518924A (en) * | 2013-09-02 | 2016-04-20 | 索尼公司 | Battery apparatus and electric vehicle |
-
2012
- 2012-10-12 CN CN2012205346835U patent/CN202948992U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916467A (en) * | 2012-10-12 | 2013-02-06 | 刘宗锋 | Parallel connection converting switch of lithium-ion battery pack |
| CN105518924A (en) * | 2013-09-02 | 2016-04-20 | 索尼公司 | Battery apparatus and electric vehicle |
| CN104242401A (en) * | 2014-09-29 | 2014-12-24 | 云南中医学院 | Low-energy-consumption battery pack parallel device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LIU ZONGFENG Free format text: FORMER OWNER: ZAOZHUANG UNIVERSITY Effective date: 20130617 |
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