CN109301140A - A kind of type power battery pack in groups of connecting - Google Patents
A kind of type power battery pack in groups of connecting Download PDFInfo
- Publication number
- CN109301140A CN109301140A CN201810431904.8A CN201810431904A CN109301140A CN 109301140 A CN109301140 A CN 109301140A CN 201810431904 A CN201810431904 A CN 201810431904A CN 109301140 A CN109301140 A CN 109301140A
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- Prior art keywords
- battery
- battery pack
- groups
- core
- type power
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of connections of low-voltage power battery pack in groups, and N number of battery block parallel with one another forms battery pack；Each battery block is connected in series by M single battery core and a fuse；Point following two situation: I) N and M is the integer more than or equal to 2；II) N and M is integer, andPower battery pack provided by the invention connects burst mode, and safety with higher after facilitating electric vehicle to enter charging station, realizes that electric power supplements using electric mode is changed, and user can voluntarily be equipped with the capacity of battery pack according to demand.
Description
The present patent application be the applying date be on December 16th, 2015, application No. is 201510945068.1 divisional applications.
Technical field
The present invention relates to power battery technology field, in particular to a kind of low-voltage power battery pack connection type.
Background technique
With the popularization of electric car, lithium ion battery in national economy using more and more extensive, single battery needs
Meet the voltage and capacity requirement of battery pack by way of multi-parallel of more connecting；There are many common battery connection type, including
Parallel connection (after hereinafter referred to as first going here and there simultaneously), mixing series and parallel structure after series connection (hereinafter referred to as first and afterwards going here and there), first series connection after first parallel connection
Deng.
Now largely be first and rear string structure, as tesla model S, Leaf pure electric vehicle, Volt increase journey
Formula electric vehicle.The advantages of this battery pack connection burst mode is that have certain suppression to the inconsistency of parallel branch battery
Production is used, and the battery in same parallel branch can share a BMS, reduces the cost of battery management system.
The charging modes of electric car change electricity and do not change two kinds of electricity at present, in order to shorten the charging time, do not change the electricity of electricity
Electrical automobile often uses fast charge mode, can cause double influence to battery life and power grid in this way.And change electric mode (electric vehicle
When needing to charge, all or part of battery directly is replaced to electrical changing station) waiting that vehicle feeds the energy can be shortened to greatest extent
Time, moreover it is possible to battery be detected and be safeguarded when online lower charging, extend the service life of battery, in addition do not influencing to use
In the case where the trip requirements of family, also can focus utilization paddy electricity realize trickle charge.
But the battery pack of the prior art first and go here and there afterwards be not it is corresponding change electricity be preferably connected mode.First first and after go here and there
Connection type the drawbacks of there are oneself, internal short-circuit of battery is most common and is most difficult to the phenomenon that preventing completely, once certain
The short circuit of one batteries, other batteries in parallel will discharge to it therewith, very big security risk be caused, even if as tesla
Fuse is welded in every batteries like that, after short circuit battery is cut off, safety increases, but due to series circuit
Short -board effect, the capacity of battery will reduce, and for domestic many relatively small capacity electric cars, this capacity reduces
Influence it is bigger.
Secondly, the expectation that user exchanges electric mode is also not limited to and shortens the waiting time, it is also desirable to can be according to short distance still
Long-distance trip is voluntarily equipped with respective volume battery.And once first and after after the battery pack gone here and there is made into modularization, due to parallel connection
Number of batteries can not be altered, so being unable to satisfy the demand of user again it has been determined that i.e. battery capacity has been definite value.
Summary of the invention
Present invention aim to address in the battery pack of electric vehicle, single battery short circuit will cause security risk or capacity
Decaying and be not suitable for " changing electric mode " come charge and user can not according to trip mileage requirement change battery always hold
Amount.
To realize the present invention purpose and the technical solution adopted is that such, a kind of series connection type power battery pack in groups:
N number of battery block parallel with one another forms battery pack；Each battery block is connected in series by M single battery core；This
Kind connection type in parallel after first connecting, is made into modularization for every series arm, convenient for each battery core wire in series arm
Under equilibrium with maintenance, and vehicle need how many capacity batteries just fill several battery blocks, convenient for meeting user's course continuation mileage need
It asks.
Divide following two situation:
I) N and M is the integer more than or equal to 2；
II) N and M is integer, andIt is arrived in the electric vehicle for having used the battery pack
When charging station changes electricity, when only replacing one of them or several battery blocks (low battery battery block) or certain batteries core short circuit,
Battery block where it can automatically with other battery block balances, still exportable energy.
This two groups of ranges for explaining only the invention, and are not construed as limiting the claims.
Further, the energy of electric automobile during traveling is E, and the energy of single battery core is e, then the energy of the battery pack
E=N*e can be then denoted as.
Further, the rated current of fuse is the maximum charge or discharge current that monocell core allows.
Further, user increases or decreases battery block number in parallel according to mileage travelled.
Further, the branch road where each battery block is equipped with switch, controls this by described switch on-off
Whether the battery block of branch road accesses circuit.
Further, the single battery core is ternary material battery, its discharge voltage profile is as shown in Figure 1, corresponding
Fig. 2 is the discharge voltage profile of another common materials ferric phosphate lithium cell, it can be seen that the electric discharge electricity of ternary material battery
Line of buckling is much steeper compared with the discharge voltage profile of ferric phosphate lithium cell, and such characteristic determines the monocell of ternary material
After core is by connection type connection of the invention, when a series arm module because it occurs in certain internal section monocell core short circuit
Hold that voltage and other branch modules are inconsistent or state-of-charge (State Of Charge, hereinafter referred to as SOC) difference leads to it
When holding voltage and other branch modules inconsistent, entire battery pack can automatic equalization.
The solution have the advantages that unquestionable, firstly, this changes electric mode can shorten vehicle supply to greatest extent
The waiting time of the energy, moreover it is possible to battery be detected and be safeguarded when online lower charging, extend the service life of battery, in addition
In the case where not influencing user's trip requirements, also can focus utilization paddy electricity realize trickle charge.
In addition, the invention avoids the security risks of existing battery pack due to adaptation function, do not have to as existing
Technology welds fuse in every batteries like that, reduces after being cut off because of short circuit battery, and the capacity of battery significantly reduces
Probability, this is great for the meaning of domestic many relatively small capacity electric cars.
Secondly, user can voluntarily be equipped with respective volume battery according to short distance or long-distance trip.Rather than existing
Battery pack is made into after modularization, and battery capacity has been definite value, can not be altered again.
Detailed description of the invention
Schematic diagram Fig. 1 of the invention；
Fig. 2 is ternary material monocell core discharge voltage profile figure
Fig. 3 is the discharge voltage profile of ferric phosphate lithium cell；
Fig. 4 is the parameter of battery in Fig. 1.
Fig. 5 is the charging and discharging curve of ternary material lithium ion battery.
Fig. 6 is the elder generation of the prior art and the connection type gone here and there afterwards.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, but should not be construed the above-mentioned master of the present invention
Topic range is only limitted to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill
Knowledge and customary means make various replacements and change, should all include within the scope of the present invention.
In exemplary implementation of the invention, when giving a. charging station based on ternary material battery core parameter and changing electric mode,
The voltage difference of vehicle is loaded with when only replacing one of them or several battery blocks low battery battery block and the high Electronic power batteries block of displacement
When allowed band b. batteries core short circuit, where battery block can automatically with other battery block balances, still exportable energy,
The range that series-connected cell core number M, the batteries in parallel connection block number N of battery pack need to meet.Particularly, this two groups of ranges are only used for explaining
The present invention, and be not construed as limiting the claims.
Fig. 1 shows series connection type power battery pack in groups provided in an embodiment of the present invention, the parameter of battery as shown in figure 4,
The rated current of fuse is selected as 3C according to the parameter of battery, by a fuse as described above and 20 batteries according to
Secondary series connection forms a battery block, and obtaining the practical internal resistance an of battery block through experiment is about r=80m Ω, then by 8 batteries
Block parallel connection forms entire battery pack.
For verify different SOC battery block can parallel with one another and automatic equalization, it is assumed herein that when using changing electric mode,
We retain n battery block and replace remaining 8-n battery block.N low battery battery block of reservation is equivalent to 1 battery block,
Its open-circuit voltage is set as OCV1, polarizing voltage is set as V when large current chargep1, voltage is held to be set as Vo1, internal resistance is set as r1=r/n；
The high Electronic power batteries block open-circuit voltage of displacement is set as OCV2, polarizing voltage when heavy-current discharge is set as Vp2, voltage is held to be set as
Vo2, internal resistance is set as r2=80m Ω, when a displacement battery block is in parallel with remaining n battery block, outflow displacement battery block
Middle electric current is
That is:
Above-mentioned inequality perseverance is set up, needs to meet
Because of 1≤n≤7, V when 3C is large current dischargep2>=20 × 0.1=2V, Vp1>=0 ignores here, so having
By testing resulting charging and discharging curve as shown in figure 5, as seen from the figure, above-mentioned voltage range can substantially cover centre
Section [0.3,0.8] SOC, meets practical charging station and changes electric requirement.
When single battery core short circuit in some battery block, remaining cell voltage in short circuit branch will be increasedV is the voltage of single battery core, learns that the ceiling voltage that battery can be born is 4.4V by the parameter of battery, is
Guarantee that cell safety uses, monocell core highest is charged to 4V or so when use, therefore only when meetingJust not
To short circuit branch, remaining battery causes security risk for meeting, obtains M >=11；Remain to regular picture to short circuit branch, then it is single
Battery transcient short circuit time, the short circuit branch charging current where it cannot be greater than the rated current 3C of fuse, i.e.,
It is obtained after bringing the design parameter of battery intoIt is necessary for being more than or equal in conjunction with M and N
2 integer and M has to be larger than equal to 11, obtains:
18≤M≤34；
When single battery core is short-circuit but M, N are unsatisfactory for Multisection battery core short circuit in above range or same battery block, protect
To cut off security risk, which stops electric discharge for dangerous silk fusing.It is similar with when occurring battery open circuit in battery block, entirely
Battery capacity reduces 1/N.
Fig. 6 shows connection type that is first under same voltage and capacity requirement and going here and there afterwards, and battery short circuit causes to pacify in order to prevent
Full hidden danger all has to welding fuse on every batteries core.
Under this connection type, single battery short circuit or open circuit influence be it is the same, can all enable the appearance of entire battery pack
Amount reduces 1/N.
It is short from the point of view of overall economy quality since the probability of core of lithium ion cell short circuit is far longer than the probability of open circuit
Under road or open circuit fault, battery pack structure provided by the invention is more excellent.
Claims (5)
1. a kind of type power battery pack in groups of connecting, it is characterised in that:
N number of battery block parallel with one another forms battery pack；Each battery block is by M single battery core and a fuse series connection
It forms.
2. a kind of type power battery pack in groups of connecting according to claim 1, it is characterised in that: the energy of electric automobile during traveling
Amount is E, and the energy of single battery core is e, then the energy of the battery pack can then be denoted as E=N*e.
3. a kind of type power battery pack in groups of connecting according to claim 1, it is characterised in that: the rated current of fuse
The maximum charge or discharge current allowed for monocell core.
4. a kind of type power battery pack in groups of connecting according to claim 1, it is characterised in that: divide following two situation:
I) N and M is the integer more than or equal to 2；
II) N and M is integer, and
5. a kind of series connection type power battery pack in groups according to claim 1, it is characterised in that: the single battery core is
Ternary material battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810431904.8A CN109301140A (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510296777 | 2015-06-02 | ||
| CN201510945068.1A CN105406015B (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
| CN201810431904.8A CN109301140A (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510945068.1A Division CN105406015B (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
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| CN109301140A true CN109301140A (en) | 2019-02-01 |
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| CN201810431904.8A Pending CN109301140A (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
| CN201510945068.1A Active CN105406015B (en) | 2015-06-02 | 2015-12-16 | A kind of type power battery pack in groups of connecting |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108172747A (en) * | 2018-01-08 | 2018-06-15 | 程志均 | It is a kind of first go here and there after and type dynamic lithium battery group |
| CN110497819B (en) * | 2018-05-16 | 2023-04-28 | 南京酷朗电子有限公司 | Battery replacement system and method for dynamically changing capacity of vehicle-mounted battery of electric automobile |
| CN117525759A (en) * | 2020-02-28 | 2024-02-06 | 比亚迪股份有限公司 | Battery pack and electric vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104685669A (en) * | 2012-09-25 | 2015-06-03 | 日本碍子株式会社 | Module battery and production method for module battery |
| JP6180982B2 (en) * | 2014-03-28 | 2017-08-16 | 本田技研工業株式会社 | vehicle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101016825B1 (en) * | 2009-02-24 | 2011-02-21 | 삼성에스디아이 주식회사 | Battery pack and protecting method thereof |
| CN102723455A (en) * | 2012-05-02 | 2012-10-10 | 清华大学 | In-parallel type power battery pack |
| CN102723750A (en) * | 2012-05-02 | 2012-10-10 | 清华大学 | Hybrid packing type power battery pack |
-
2015
- 2015-12-16 CN CN201810431904.8A patent/CN109301140A/en active Pending
- 2015-12-16 CN CN201510945068.1A patent/CN105406015B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104685669A (en) * | 2012-09-25 | 2015-06-03 | 日本碍子株式会社 | Module battery and production method for module battery |
| JP6180982B2 (en) * | 2014-03-28 | 2017-08-16 | 本田技研工業株式会社 | vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 仝瑞军等: ""一种新型纯电动城市客车锂电池组的PACK及管理"", 《客车技术与研究》 * |
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| Publication number | Publication date |
|---|---|
| CN105406015B (en) | 2018-06-19 |
| CN105406015A (en) | 2016-03-16 |
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