CN1175511C - Nickel-hydrogen battery pack with improved single battery uniformity - Google Patents
Nickel-hydrogen battery pack with improved single battery uniformity Download PDFInfo
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- CN1175511C CN1175511C CNB021119945A CN02111994A CN1175511C CN 1175511 C CN1175511 C CN 1175511C CN B021119945 A CNB021119945 A CN B021119945A CN 02111994 A CN02111994 A CN 02111994A CN 1175511 C CN1175511 C CN 1175511C
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- cell
- battery pack
- battery
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- block
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention relates to a nickel-hydrogen battery pack/block for improving the consistency of single batteries, which belongs to the field of a nickel-hydrogen battery pack. The present invention is characterized in that the battery pack/block is composed of a plurality of monomer batteries, wherein positive terminals and negative terminals of adjacent single batteries form an electronic channel, and the positive terminals and negative terminals of the adjacent single batteries are respectively connected with a positive terminal and a negative terminal of the whole battery pack to form a positive electrode and a negative electrode of the whole battery pack/block; a semipermeable membrane is arranged above each single battery; all the single batteries in the battery pack/block share one safety valve; the semipermeable membrane is made of a PTEE material or a PE material or a PP material, the porosity of the semipermeable membrane is from 20 to 60 vol%, the thickness of the semipermeable membrane is from 0.01 to 0.5mm, and pores of the semipermeable membrane are through pores or crooked pores. The battery pack/block designed by the present invention, which can balance the internal pressures of all the single batteries in the battery pack/block, performs the action of 'lagged' single battery protection and improves the consistency of the single batteries.
Description
Technical field
The present invention relates to a kind of conforming Ni-MH battery group of cell that is used to improve; or rather; designed a kind of structure that is suitable for the Ni-MH battery group of uses such as pure electric vehicle and hybrid electric vehicle; the interior pressure of each cell plays the effect of protection " backwardness " cell in can the balancing battery group.The invention belongs to Ni-MH battery group field.
Background technology
For satisfying the requirement of power and energy, need the series connection of hundreds of joint cell when being actually used in electric motor car, generally become a battery block by ten cell Series Packages, be connected into battery pack by several battery blocks again.The performance of each cell is often inconsistent in the battery block.The reason of this respect has a lot, and it relates to various raw material and a lot of aspects such as production technology, battery design parameter and process equipment precision, battery combination form and environment for use condition, battery set management mode and battery set charge/discharge pattern.Although controlled to greatest extent aborning, also select through strictness during combination, during actual cycle is used for various reasons in the battery block each monomer rate of decay difference still can cause new unbalanced.Nickel-hydrogen battery negative pole also will be reserved a part of Charging state capacity (the pre-allowance of discharging) except have more part discharge attitude capacity (the pre-allowance of charging) than positive pole, thereby the homogeneity of Ni-MH battery combination property more be cannot say for sure to demonstrate,prove.Because inevitable individual difference, can cause the chemical property of whole battery group to descend in charge and discharge process because of the appearance of some " backwardness " cell, especially high temperature or fast charging and discharging process will make the interior voltage rise height and the lost of life of battery pack.In a single day behindhand battery occurs in the Ni-MH battery group and just enter in the vicious circle, badly influence the overall performance of battery pack, shortened service life, also improved the operating cost of electric motor car indirectly.Therefore how to improve the consistency of cell, make the chemical property of inner each cell of battery pack balanced substantially, most important for the overall performance that improves battery pack.
Summary of the invention
The present invention proposes a kind of conforming structure of cell of improving just for addressing the above problem, and has promptly designed a kind of being more suitable in the structure of the Ni-MH battery group of pure electric vehicle and hybrid electric vehicle use.
As everyone knows, Ni-MH battery is to be anodal with the nickel hydroxide electrode, and metal hydride is a negative pole, is the sealed cell of electrolyte with solution such as lithium hydroxide, potassium hydroxide.Because the result of battery charging and discharging electrode reaction contains hydrogen in the sealing system, the charging later stage is contained the mist of hydrogen and oxygen.Usually each battery is equipped with a safety valve, so that just in case when inner pressure of battery reaches certain set point, discharge inside battery gas, thereby guarantee safety.
One of feature of the present invention is on each cell top, be to lay 3 pellicles that only allow gas permeation and can not allow electrolyte see through between the positive and negative terminals, it is made by PTFE (polytetrafluoroethylene) or PE (polyethylene) or PP (polypropylene) material, its porosity ranges is 20～60%, is bent hole or clear opening.Thickness is 0.01-0.5mm.
Another feature of the present invention is in the battery pack structure of a plurality of cells compositions, the positive and negative terminals of adjacent cell or form the electronics path by wire bonds or by the bipolarity metallic plate, and connect respectively with the positive and negative terminals of lead with whole battery group.The shared safety valve of each cell in the battery pack, when pressure was higher than a particular value in the integral body of battery pack, safety valve was opened automatically.Rather than each cell is all installed an independently safety valve.
More than two architectural features, can the balancing battery group in the interior pressure of each cell, play the effect of protection " backwardness " battery, this be because:
1. negative pole can produce hydrogen the batteries charging later stage.For preventing that too much hydrogen from causing interior pressure too high, negative pole than the anodal capacity that has stayed a part to be in chargeable attitude more during battery design.When the shared safety valve of battery pack, even the chargeable attitude capacity of a certain battery is lower, hydrogen wherein also can be distributed to other cell and is consumed by ventilated membrane, does not press liter in can not causing.
2. the negative pole alloy may be forced to oxidation the battery power discharge later stage.For preventing this situation, negative pole Duo a part of capacity that is in the attitude of can discharging again than anodal during battery design, when the shared safety valve of battery pack, even the discharged attitude of certain cell capacity is lower, under the effect of equilibrium state Hydrogen Vapor Pressure, system also can be spontaneously to this monomer hydrogen make-up, and this has been equivalent to increase the discharged attitude capacity of this cell, thereby avoids its negative pole alloy oxidized.
3. the whole voltage endurance capability of battery pack improves.If certain cell is because oxygen, hydrogen or hydrogen and oxygen gas mixture cause interior voltage rise height, gas can be distributed in the integral battery door group in other the cell and is consumed by pellicle, the many monomer of gas just can not be therefore and exhaust, thereby the internal resistance of cell of having avoided causing thus increases and shorter battery life.
4. the lean solution degree of each cell electrolyte can reach unanimity in the battery pack, helps the consistent of the internal resistance of cell and charging/discharging voltage.In the cell of rich solution, gas recombination speed is low, and oxygen wherein and hydrogen can be overflowed more water is reduced, and gas increases at the compound water that makes of rich solution degree lower more.
5. Temperature Distribution can be more even in the battery pack, avoids thermal runaway.Charging later stage precipitated oxygen earlier when the anodal reality of certain cell can be filled capacity and hanged down, oxygen compound meeting in this monomer elevate the temperature and to cause positive pole to analyse oxygen more serious, and promptly temperature is higher, and charge efficiency is lower.Negative pole also can the Yin Wendu rising cause the hydrogen-storage alloy effective hydrogen capacity to reduce, interior voltage rise height, and oxidation also can be more serious.Public safety valve makes oxygen also compound in other normal battery (promptly not analysing the battery of oxygen as yet in a large number), thereby reduced the internal temperature of " behindhand battery ", improve effective hydrogen storage amount of its anodal charge efficiency and negative pole, promptly increased the available capacity of both positive and negative polarity under the equal conditions.This battery can not enter capacity low-analyse oxygen many-temperature height-analyse oxygen is more-higher (" thermal runaway ")-charge efficiency of temperature is lower-vicious circle that capacity is lower.
6. cell is not established safety valve separately, whole battery group is only established a public safety valve, therefore in one group/piece battery, only need a pressure sensor can monitor the interior pressure of whole battery group, also reduced the weight of battery pack so simultaneously, improve the specific characteristic of battery pack, also reduced the cost of system.When pressure was higher than a particular value in the integral body, safety valve was opened automatically.
Cell involved in the present invention is square or cylindrical, battery pack is composed in series by a plurality of cells, the electronics path is arranged between the cell, each cell top is equipped with the pellicle of a permeable watertight or electrolyte, the interior pressure of each cell in can the balance whole battery group, associated capacity and moisture content, thus make that the consistency of cell improves in this battery pack.Battery case is made with stainless steel or plastics.Flexible insulating pad between a plurality of cells of formation battery pack and shell is to guarantee the good contact between cell and battery pack is fixed.
Description of drawings
Fig. 1 is the monomer rectangular cell structural representation that the present invention relates to.
Fig. 2 is the structural representation of the battery pack that is made of a plurality of monomer rectangular cells shown in Figure 1 series connection.
Among the figure:
1-cell shell, 2-cell positive pole
3-cell negative pole, 4-pellicle
The shared safety valve of 5-battery anode, 6-battery pack
7-battery pack negative pole, 8-battery-pack exterior casing
9-elastic insulated backing plate
Embodiment
Further specify substantive distinguishing features of the present invention and marked improvement below by execution mode.
Embodiment 1
The profile of a plurality of cells has a pellicle as shown in Figure 1 above it between the positive and negative terminals, it is made of three PTFE materials, its porosity is 45%, and clear opening, its thickness are 0.2mm, it can only allow hydrogen or oxygen pass through, and does not allow electrolyte or moisture content pass through.Being linked to each other by six monomer rectangular cell both positive and negative polarities forms the electronics path, at last be positioned at shell on both positive and negative polarity 5,7 link to each other respectively, between both positive and negative polarity, be provided with safety valve.Shell is made by stainless steel.The filling of insulation perforated foams is arranged between battery and the shell, to compress cell in the battery pack, make closely contact mutually between them, concrete structure as shown in Figure 2.
Embodiment 2
Cell is circular, and the pellicle of cell top is to be made by the PE material, contains porosity and be 30% bent hole, it forms battery pack by 8 cells, be placed in the shell that circular engineering plastics make, 8 shared safety valves of monomer, all the other are as embodiment 1.
Claims (5)
1. one kind is used to improve the conforming Ni-MH battery group of cell, form by a plurality of cells, the positive and negative terminals of adjacent monomer battery forms the electronics path, and links to each other respectively with the positive and negative terminals of whole battery group with lead and to form the both positive and negative polarity of entire cell chunk, it is characterized in that:
(1) pellicle of laying between the cell positive and negative terminals can only allow gas permeation and electrolyte can not see through, and described pellicle is made by polytetrafluoroethylene or polyethylene or polypropylene material, and its porosity is 20-60%; Pellicle thickness is 0.01-0.5mm;
(2) the shared safety valve of each cell in the battery pack.
2. be used to improve the conforming Ni-MH battery group of cell by claim 1 is described, it is characterized in that laying between the positive and negative terminals 3 pellicles.
3. describedly be used to improve the conforming Ni-MH battery group of cell by claim 1 or 2, it is characterized in that on the pellicle the hole or for clear opening or be bent hole.
4. be used to improve the conforming Ni-MH battery group of cell by claim 1 is described, it is characterized in that cell or for square or be column type.
5. be used to improve the conforming Ni-MH battery group of cell by claim 1 is described, it is characterized in that the shell of described battery pack or for square or for cylindrical; Flexible insulating pad between the cell of shell and formation battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021119945A CN1175511C (en) | 2002-06-07 | 2002-06-07 | Nickel-hydrogen battery pack with improved single battery uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021119945A CN1175511C (en) | 2002-06-07 | 2002-06-07 | Nickel-hydrogen battery pack with improved single battery uniformity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1384559A CN1384559A (en) | 2002-12-11 |
| CN1175511C true CN1175511C (en) | 2004-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021119945A Expired - Fee Related CN1175511C (en) | 2002-06-07 | 2002-06-07 | Nickel-hydrogen battery pack with improved single battery uniformity |
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| Country | Link |
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| CN (1) | CN1175511C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009044570A1 (en) * | 2009-11-17 | 2011-05-19 | Ssb Wind Systems Gmbh & Co. Kg | Wind turbine |
| CN102024927A (en) * | 2010-11-16 | 2011-04-20 | 成都振中电气有限公司 | Battery pack for electric vehicle |
| CN103296320A (en) * | 2011-10-14 | 2013-09-11 | 江苏春兰清洁能源研究院有限公司 | High-capacity nickel-hydrogen battery |
| CN102629674A (en) * | 2012-04-12 | 2012-08-08 | 江苏春兰清洁能源研究院有限公司 | Large-capacity nickel hydrogen battery pack structure |
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2002
- 2002-06-07 CN CNB021119945A patent/CN1175511C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1384559A (en) | 2002-12-11 |
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Owner name: SHANGHAI WANHONG MOTOR ENERGY CO., LTD. Free format text: FORMER OWNER: SHANGHAI INST. OF MICROSYSTEM AND INFORMATION TECHNOLOGY, CHINESE ACADEMY OF SCI Effective date: 20070629 |
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Effective date of registration: 20070629 Address after: 201807 No. 255, building 6, North Highway, Shanghai, Jiading District Patentee after: Wanhong Power Energy Co., Ltd., Shanghai Address before: 200050 No. 865, Changning Road, Shanghai, Changning District Patentee before: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041110 Termination date: 20170607 |
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| CF01 | Termination of patent right due to non-payment of annual fee |