CN114335751A - Power type polymer lithium ion battery monomer, battery pack and battery pack - Google Patents
Power type polymer lithium ion battery monomer, battery pack and battery pack Download PDFInfo
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- CN114335751A CN114335751A CN202111637740.2A CN202111637740A CN114335751A CN 114335751 A CN114335751 A CN 114335751A CN 202111637740 A CN202111637740 A CN 202111637740A CN 114335751 A CN114335751 A CN 114335751A
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- battery
- battery pack
- lithium ion
- polymer lithium
- monomer
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- 239000000178 monomer Substances 0.000 title claims abstract description 146
- 229920000642 polymer Polymers 0.000 title claims abstract description 71
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 70
- 239000004033 plastic Substances 0.000 claims abstract description 45
- 229920003023 plastic Polymers 0.000 claims abstract description 45
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 9
- 238000010030 laminating Methods 0.000 abstract description 4
- 210000004027 cell Anatomy 0.000 description 126
- 238000010438 heat treatment Methods 0.000 description 23
- 238000009826 distribution Methods 0.000 description 21
- 239000011257 shell material Substances 0.000 description 15
- 238000013461 design Methods 0.000 description 10
- 238000003491 array Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 2
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a power type polymer lithium ion battery monomer, a battery pack and a battery pack. The power type polymer lithium ion battery monomer comprises a battery body, wherein the battery body is formed by laminating a battery core, more than two groups of positive and negative pole pieces of the battery core are provided with positive and negative pole guide lugs, the positive and negative pole guide lugs are positioned on the top end surface in the height direction of the battery core, the battery body is sealed and packaged by an aluminum-plastic composite film, and the power type polymer lithium ion battery monomer is provided with a width L, a height H and a thickness D, wherein the width L is larger than the height H, the height H is larger than the thickness D, the width L is 2600mm, and L/H is 7-35. The battery monomer and the battery pack have strong rapid charging and discharging capabilities, the battery monomer generates less heat, the integral arrangement in the battery pack is facilitated, the space utilization rate of the battery pack is improved, the energy density and the power density of the battery pack are enlarged, and the cruising ability, the safety performance and the service life of the battery pack are further enhanced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a power type polymer lithium ion battery monomer, a battery assembly and a battery pack.
Background
At present, a single group of positive and negative electrode flow guide tabs are basically adopted for connecting power battery monomers with a polymer flexible package shell structure applied to an electric vehicle, the longer the battery cell pole piece is, the greater the continuous heavy current or high-power discharge capacity of the battery monomer for a long time is limited, and even the phenomena of overheating, liquid leakage, even short circuit and the like of the battery cell tab position in the long-time use process of the battery can be caused, so that the battery safety accident is caused, and the popularization and application of the battery in the field of electric vehicles are greatly influenced.
The power battery pack applied to the electric vehicle mainly comprises a pack body and a plurality of battery modules installed in the pack body, wherein each battery module is formed by assembling a plurality of single batteries. Because battery internal resistance, the restriction that overflows, the size of battery cell generally can not design too big, assembles battery module into battery cell, places battery module in the battery tray again, because battery cell's size is less, and the width is shorter, and battery cell's relative both ends can't be with two boundary beam looks adaptations of relative setting in the battery package, consequently need set up crossbeam and/or longeron so that battery cell assembles among the accommodate device.
Along with the gradual improvement of the endurance requirement of a user on the electric vehicle, under the condition of limited space at the bottom of the vehicle body, the utilization rate of the internal space of the bag body can be reduced by adopting the power battery bag with the structure, so that the ratio of the sum of the volumes of the single batteries in the power battery bag to the volume of the bag body is too low, the energy density cannot meet the endurance requirement of the user on the electric vehicle, and the energy density also gradually becomes an important factor for restricting the development of the electric vehicle.
CN 111834567 a discloses a battery module including ultra-large width battery cells, which includes: a battery unit having a plurality of electrode tabs connected to both ends thereof; a battery laminate formed by laminating battery cells; two-end bus bar assemblies formed at both ends of the battery stack and electrically connecting electrode tabs of the plurality of battery cells; a lateral bus bar assembly electrically connecting electrode tabs connected to both ends of a battery cell disposed at the uppermost end or the lowermost end of the battery stack; and a case housing the battery stack body, the both-end bus bar assembly, and the lateral bus bar assembly. The battery module can improve the current output capacity of the polymer battery to a certain extent under the condition that the length of the battery monomer is not more than 600mm, however, the electric connection mode of the battery monomer in the battery module is complex and has high cost, the effective space utilization rate of the battery is low, the volume energy density, the weight energy density and the battery grouping efficiency of the battery pack are greatly reduced, and the application and the popularization of the polymer lithium ion battery are not facilitated.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a power type polymer lithium ion battery monomer, a battery assembly and a battery pack, wherein the battery monomer generates less heat and has strong rapid charging and discharging capacity, the problems of higher internal resistance, body heating and the like of an overlong battery can be thoroughly solved, the space utilization rate of the battery pack is improved, the energy density and the charging and discharging power density of the battery pack are enlarged, and the cruising capacity and the safety performance of the battery pack are further enhanced.
The invention provides a power type polymer lithium ion battery monomer (simply referred to as a battery monomer), which comprises a battery body, positive and negative electrode flow guide lugs and an aluminum-plastic composite film shell, wherein the battery body is formed by laminating battery cells, the positive and negative electrode plates of the battery cells are provided with more than two groups of positive and negative electrode flow guide lugs, the positive and negative electrode flow guide lugs are positioned on the top end surface in the height direction of the battery cells, the battery body is sealed and packaged by an aluminum-plastic composite film, and the power type polymer lithium ion battery monomer has a width L, a height H and a thickness D, wherein the width L is greater than the height H, the height H is greater than the thickness D, the width L is 2600mm, and the L/H is 7-35.
The battery cell assembly mode in the battery monomer adopts a lamination process, the positive and negative pole pieces are provided with more than two groups of positive and negative pole guide tabs which are positioned on the top end surface in the height direction of the battery cell and symmetrically distributed on two sides of the top end of the battery cell in pairs, so that the later-stage series combination of the battery monomers is facilitated; the positive and negative pole pieces of the battery cell and the positive and negative pole guide tabs are welded together by an ultrasonic welding machine or a laser welding machine, and high-temperature-resistant insulating spacers are pasted on two sides of the welding point position so as to prevent the internal short circuit phenomenon caused by the local uneven heating of the battery cell or the piercing of burrs on the aluminum-plastic composite film, and the high-temperature-resistant insulating spacers can be made of one or a plurality of insulating materials made of insoluble electrolyte materials such as polypropylene (PP), Polyethylene (PE), Polyimide (PI) and the like; the shell material of the battery body adopts an aluminum-plastic composite film, the battery cell body adopts the aluminum-plastic composite film to carry out sealing packaging through heating and pressurizing, and the positive and negative pole flow guide tabs and the aluminum-plastic composite film are heat-sealed together.
It can be understood that the lithium ion battery also comprises a bus bar, and the power polymer lithium ion battery cells are connected through the bus bar; in the invention, the bus bar is welded with the positive and negative electrode flow guide tabs so as to connect the power type polymer lithium ion battery monomers in series. More specifically, the positive and negative electrode flow guide tabs and the bus bar can be welded together by laser welding to realize the series connection and voltage acquisition of the battery cells.
In the invention, the number of the positive and negative electrode flow guide tabs can be determined according to the width of the battery monomer, and a group of positive and negative electrode flow guide tabs are arranged at the interval of 250-400 mm. That is, the distance between the positive and negative electrode flow guide tabs of adjacent same poles is 400mm, preferably 350mm in 300-.
The battery monomer has strong rapid charging and discharging capacity, generates less heat, and is beneficial to the integral arrangement of the battery monomer in the battery pack, so that the space utilization rate of the battery pack is improved, the energy density and the power density of the power battery pack are enlarged, and the cruising ability, the safety performance and the service life of the power battery pack are further enhanced.
The invention also provides a power type polymer lithium ion battery monomer assembly (simply referred to as a battery monomer assembly), which comprises an I-shaped plastic frame and two power type polymer lithium ion battery monomers, wherein the two power type polymer lithium ion battery monomers are relatively fixed on two sides of a central plate of the I-shaped plastic frame, an elastic insulating heat baffle is arranged on the outer side of each power type polymer lithium ion battery monomer, and the inner side of each power type polymer lithium ion battery monomer is fixed on the central plate of the I-shaped plastic frame through heat conducting glue.
Furthermore, a plurality of fixing holes for fixing the power polymer lithium ion battery monomer assembly into a battery monomer array are formed in the I-shaped plastic frame. The arrangement position and the arrangement quantity of the fixing holes are not strictly limited, the fixing holes can be reasonably arranged according to actual needs, and the number of the fixing holes can be more than four.
Particularly, a heating component is arranged on a central plate of the I-shaped plastic frame, and the heating component can heat the power polymer lithium ion battery monomer when the temperature of the power polymer lithium ion battery monomer is lower than a set temperature. The mode can ensure that the battery works within a reasonable temperature range, and further the service life and the cruising ability of the single battery and the battery pack are improved.
The power type polymer lithium ion battery monomer component utilizes an I-shaped plastic frame to assemble two power type polymer lithium ion battery monomers together, one side of each battery monomer is pasted with an elastic insulating heat-insulating plate, and the other side of each battery monomer is fixed and insulated with a central plate of the I-shaped plastic frame by adopting heat-conducting glue to form the battery monomer component; the central plate of the I-shaped plastic frame in the battery monomer assembly is provided with a heating assembly, the heating assembly and the central plate can be integrated into a whole, and the temperature of the battery monomer is regulated in a temperature control mode of heating the large surface of the battery monomer; the battery monomer components can be combined and fastened through more than four fixing holes arranged on the I-shaped plastic frame through fixing pieces such as connecting screws and the like to form a battery array; the formed battery array is arranged in the bag body of the battery bag and is fixed with the bag body through the connecting screw rod and the fixing component.
The invention also provides a battery pack, which comprises a pack body and a battery monomer array, wherein the battery monomer array comprises a plurality of power type polymer lithium ion battery monomer assemblies, the power type polymer lithium ion battery monomer assemblies are fixed into the battery monomer array through fixing pieces, a placing area is arranged in the pack body, and the battery monomer array is fixedly placed in the placing area of the pack body.
It can be understood that a fixing member may be provided in the battery pack of the present invention, and the battery cell array may be fixed to the fixing member; more specifically, a battery cell array may be disposed on the bottom support of the battery pack, and the battery cell array may be jointly fastened by the battery cell assembly, the array fastener, and the battery pack bus bar.
The direction of two parallel planes corresponding to the width L direction of the battery monomer is set as the direction Q, a placing area is formed in the bag body, the battery monomer array is positioned in the placing area, and the battery monomer component extends from one side of the placing area to the other side of the placing area along the direction Q. The battery pack of the invention forms the battery array by a plurality of long battery monomer assemblies, improves the battery capacity of the battery pack, and simultaneously improves the space utilization rate of the battery pack by adopting the width L in a specific range.
The battery pack comprises a temperature control system, and the temperature control system is arranged according to the following thinking: the temperature control mode of heating the large surface of the single battery body is used for regulating the temperature of the single battery body, and meanwhile, the temperature of the positive and negative pole flow guide tabs of the single battery body which is most prone to heat generation or heat conduction in the single battery body array is intensively controlled. At this moment, the temperature control system can be arranged at the top of the battery monomer array so as to cool the positive and negative electrode flow guide tabs, and an elastic insulating heat conduction rubber pad is arranged between the temperature control system and the battery monomer array.
In addition, can set up elasticity heat conduction silica gel piece between battery monomer array in the battery package and the battery package top support piece, appear overheated or the temperature plays the heat conduction effect when crossing lowly in battery monomer array, all the time with battery package temperature control in suitable scope to improve battery package's life and continuation of the journey mileage. The temperature control system arranged at the top of the battery cell array can be combined with the top end of the supporting piece at the top of the battery pack into a whole, and the heat conducting medium of the temperature control system can adopt conventional media such as liquid or gas.
In the invention, the battery pack only allows the battery cells to participate in series connection in a one-time manner when the battery cells are connected in series and parallel; particularly, metal connecting devices used for connecting the head end and the tail end of the battery monomer array in series in the battery pack have the functions of overcurrent fusing and protection.
In the present invention, the battery cell array may be a square battery cell array, and the square battery cell array is disposed along a thickness direction of the power type polymer lithium ion battery cell. The number of the battery cell arrays 14 may be one array or two arrays, and at most, not more than two arrays are provided.
Furthermore, a reserved space can be arranged between the bag body and the battery monomer array to serve as safety buffer; meanwhile, the temperature control system is provided with a temperature acquisition system for acquiring the temperature of the power polymer lithium ion battery monomer, and the current connecting lead, the voltage acquisition line and the temperature acquisition system can be arranged in the reserved space; more specifically, the current connection wires, the voltage collection wires, the temperature collection system and the central plate heating assembly connection wires of the plastic structural frame may be arranged in a small-sized space of a structure protruding from the cell assembly fixing holes at both sides of the width of the battery cell array, and then fixed in a concentrated manner through the insulation wire guide.
In the battery pack, the structural material can adopt one or more of light-weight materials such as pure aluminum, aluminum alloy, aluminum profiles, engineering plastics, basalt fiber materials and the like.
The battery pack has strong rapid charging and discharging capacity, the single battery generates less heat, and the problems of high internal resistance and body heating of the ultra-long battery can be thoroughly solved; the arrangement of the current connecting lead, the voltage collecting wire and the temperature collecting system fully utilizes the reserved safety buffer space between the bag body structural member and two sides of the battery monomer array, and is beneficial to the integral arrangement in the battery bag, so that the space utilization rate of the battery bag is improved, the energy density and the charging and discharging power density of the battery bag are enlarged, and the cruising ability and the safety performance of the battery bag are further enhanced; meanwhile, the battery pack cancels an internal parallel connection mode of the battery, and is beneficial to improving the consistency of the battery units only by adopting a structural design of a plurality of series connections. The battery pack is a battery pack with a CTP structure without a module, and is particularly suitable for a CTC design scheme, namely a structure design scheme that the battery pack and an electric vehicle chassis are combined into a whole.
The implementation of the invention has at least the following advantages:
1) the power type polymer lithium ion battery monomer provided by the invention has more than two groups of positive and negative electrode guide lugs, and the positive and negative electrode guide lugs are positioned on the top end surface in the height direction of the battery cell, so that the power type polymer lithium ion battery monomer has the advantages of high structural safety performance, strong heat dissipation capability, good rapid charge and discharge capability and the like;
2) the power type polymer lithium ion battery monomer disclosed by the invention has low internal resistance, so that heat is less generated, the problems of high internal resistance and body heating of an ultra-long battery can be thoroughly solved, and the whole arrangement of the battery monomer in a battery pack is facilitated, so that the space utilization rate of the battery pack is improved, the energy density and the power density of the battery pack are enlarged, and the cruising ability of the battery pack is further enhanced;
3) the preparation process of the single battery and the battery pack is simple and feasible, and can realize large-scale production; the battery monomer and the battery pack have higher volume energy density and volume utilization rate, are a battery pack with a module-free CTP structure, and are particularly suitable for a CTC design scheme, namely a structural design scheme that the battery pack and an electric vehicle chassis are combined into a whole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a battery cell according to the present invention;
FIG. 2 is a schematic structural view of an I-shaped plastic frame according to the present invention;
FIG. 3 is an external structural view of the I-shaped plastic frame of the present invention;
FIG. 4 is a top view of the I-shaped plastic frame of the present invention;
FIG. 5 is a schematic view of a busbar according to the present invention;
fig. 6 is an external structural view of a battery pack according to the present invention;
fig. 7 is an exploded view of a battery pack according to the present invention;
fig. 8 is a top view of a battery pack according to the present invention;
FIG. 9 is a schematic structural diagram of a temperature control system according to the present invention;
fig. 10 is a schematic structural diagram of a wireless charging induction coil assembly according to the present invention;
description of reference numerals:
1. a battery body; 2. positive and negative pole guide tabs; 3. an I-shaped plastic frame; 4. an elastic insulating thermal baffle; 5. heat conducting glue; 6. a fixing hole; 7. a bus bar; 8. a battery pack; 9. an upper cover; 10. a box body; 11. a temperature control system; 12. an elastic heat-conducting silica gel sheet; 13. an insulated wire slot; 14. a battery cell array; 15. a sealing strip; 16. a wireless charging induction coil assembly; 17. and a through hole.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 10, the structures of the power polymer lithium ion battery cell, the battery cell assembly and the battery pack 8 of the embodiments are as follows:
1) power type polymer lithium ion battery monomer
The power type polymer lithium ion battery monomer comprises a battery body 1, positive and negative electrode flow guide tabs 2 and an aluminum-plastic composite film shell, wherein the battery body 1 is formed by laminating a battery cell, the positive and negative electrode plates of the battery cell are provided with more than two groups of positive and negative electrode flow guide tabs 2, the positive and negative electrode flow guide tabs 2 are positioned on the top end surface in the height direction of the battery cell, the battery body 1 is sealed and packaged by an aluminum-plastic composite film, and the power type polymer lithium ion battery monomer has a width L, a height H and a thickness D, wherein the width L is greater than the height H, the height H is greater than the thickness D, the width L is 600 + 2600mm, and the L/H is 7-35.
The battery cell assembly mode in the battery monomer adopts a lamination process, more than two groups of positive and negative electrode flow guide lugs 2 can be symmetrically distributed on two sides of the top end surface in the height direction of the battery cell, so that the later-stage series combination of the battery monomers is facilitated; the high-temperature-resistant insulating spacers are welded together by an ultrasonic welding machine or a laser welding machine, and the two sides of the welding point are pasted with high-temperature-resistant insulating spacers to prevent the internal short circuit phenomenon caused by the local uneven heating of the battery cell or the piercing of burrs on the aluminum-plastic composite film, and can be mixed with one or more of insulating materials made of insoluble electrolyte such as polypropylene (PP), Polyethylene (PE), Polyimide (PI) and the like; the shell material adopts an aluminum-plastic composite film, the battery cell body adopts the aluminum-plastic composite film to carry out sealing packaging through heating and pressurizing, and the positive and negative electrode flow guide tabs 2 and the aluminum-plastic composite film are thermally sealed together.
The power type polymer lithium ion battery monomer also comprises a bus bar 7, and the bus bar 7 is welded with the positive and negative electrode guide tabs 2 so as to connect the power type polymer lithium ion battery monomer in series; the anode and cathode flow guide tabs 2 and the bus bar 7 are welded together in a laser welding mode to realize the series connection and the voltage acquisition of the battery monomers.
The number of the positive and negative electrode flow guide lugs 2 can be determined according to the width of the battery monomer, and a group of positive and negative electrode flow guide lugs 2 are arranged at the interval of 250-400mm in general; the interval between the adjacent homopolar positive and negative electrode flow guide tabs 2 is 400mm, preferably, a group of positive and negative electrode flow guide tabs 2 are arranged at the interval of 300 mm and 350 mm.
The battery monomer has strong rapid charge and discharge capacity, generates less heat, and is beneficial to the whole arrangement in the battery pack 8, thereby improving the space utilization rate of the battery pack 8, enlarging the energy density and the power density of the power battery pack 8, and further enhancing the cruising ability, the safety performance and the service life of the power battery pack 8.
2) Power type polymer lithium ion battery monomer subassembly
The power type polymer lithium ion battery monomer assembly comprises an I-shaped plastic frame 3 and two power type polymer lithium ion battery monomers, wherein the two power type polymer lithium ion battery monomers are oppositely fixed on two sides of a central plate of the I-shaped plastic frame 3, an elastic insulation heat shield 4 is arranged on the outer side of each power type polymer lithium ion battery monomer, and the inner sides of the power type polymer lithium ion battery monomers are insulated and fixed on the central plate of the I-shaped plastic frame 3 through heat conduction glue 5.
The I-shaped plastic frame 3 is provided with a plurality of fixing holes 6 for fixing the power polymer lithium ion battery monomer assembly into a battery monomer array 14. The arrangement position and the arrangement number of the fixing holes 6 are not strictly limited, the fixing holes can be reasonably arranged according to actual needs, and the number of the fixing holes 6 can be more than four.
The central plate of the I-shaped plastic frame 3 is provided with a heating component, and the heating component can heat the power polymer lithium ion battery monomer when the temperature of the power polymer lithium ion battery monomer is lower than a set temperature. This mode can ensure that the battery works at reasonable temperature range, and then improves the life and the duration of battery monomer and battery package 8.
The top of the I-shaped plastic frame 3 is provided with a plurality of through holes 17 for the positive and negative electrode flow guide tabs 2 to pass through, and the positive and negative electrode flow guide tabs 2 pass through the through holes 17 to be connected with the busbar 7.
The power type polymer lithium ion battery monomer assembly is characterized in that two power type polymer lithium ion battery monomers are assembled together by utilizing an I-shaped plastic frame 3, one side of each battery monomer is pasted with an elastic insulating and heat insulating plate 4, and the other side of each battery monomer is fixed and insulated with a central plate of the I-shaped plastic frame 3 by adopting heat conducting glue 5 to form a battery monomer assembly; a central plate of the I-shaped plastic frame 3 in the battery monomer assembly is provided with a heating assembly, the heating assembly and the central plate can be integrated into a whole, and the temperature of the battery monomer is regulated in a temperature control mode of heating the large surface of the battery monomer; the battery monomer components can be combined and fastened through more than four fixing holes 6 arranged on the I-shaped plastic frame 3 through fixing pieces such as connecting screws and the like to form a battery array; the formed battery array is arranged in the bag body of the battery bag 8 and is fixed with the bag body through the connecting screw rod and the fixing component.
3) Battery pack 8
The battery pack 8 comprises a pack body and a battery monomer array 14, the battery monomer array 14 comprises a plurality of power type polymer lithium ion battery monomer assemblies, the power type polymer lithium ion battery monomer assemblies are fixed into the battery monomer array 14 through fixing pieces, a placing area is arranged in the pack body, and the battery monomer array 14 is fixedly placed in the placing area of the pack body.
A fixing member may be provided in the battery pack 8 of the present invention, and the battery cell array 14 may be fixed to the fixing member; more specifically, the battery cell array 14 may be placed on a bottom support of the battery pack 8, and the battery cell array 14 may be secured together by the cell pack, the array holder, and the battery pack 8 bus bar 7.
The battery cell array 14 is placed in a box body 10 of the battery pack 8, an upper cover 9 is arranged above the battery pack 8, sealing strips 15 are arranged on the periphery of the top of the box body 10, and a wireless charging induction coil assembly 16 connected with a battery charging and discharging control system on the battery cell array 14 is arranged at the bottom of the box body 10 and is matched with a wireless charger for use.
Setting the directions of two parallel planes corresponding to the width L direction of the battery monomer as the Q direction, forming a placing area in the bag body, wherein the battery monomer array 14 is positioned in the placing area, and the battery monomer component extends from one side of the placing area to the other side of the placing area along the Q direction; above-mentioned battery package 8 forms battery array through a plurality of long battery monomer subassemblies, has improved battery package 8's battery capacity, adopts specific range's width L simultaneously, has improved battery package 8's space utilization.
The battery pack 8 further comprises a temperature control system 11, and the setting thought of the temperature control system 11 is as follows: the temperature control mode of heating the large surface of the single battery is used for regulating the temperature of the single battery, and meanwhile, the temperature of the positive and negative electrode flow guide tabs 2 of the single battery which is most prone to heat generation or heat conduction in the single battery array 14 is intensively controlled. At this time, the temperature control system 11 may be disposed on the top of the battery cell array 14 to cool the positive and negative electrode current-guiding tabs 2, and an elastic insulating and heat-conducting rubber pad is disposed between the temperature control system 11 and the battery cell array 14.
Set up elasticity heat conduction silica gel piece 12 between battery monomer array 14 in battery package 8 and the support piece of battery package 8 top, appear overheated or the temperature plays the heat conduction effect when crossing lowly in battery monomer array 14, is all the time with battery package 8 temperature control in suitable scope to improve battery package 8's life and continuation of the journey mileage. The temperature control system 11 arranged on the top of the battery cell array 14 can be integrated with the top end of the support member on the top of the battery pack 8, and the heat conducting medium of the temperature control system 11 can be a conventional medium such as liquid or gas.
The battery pack 8 allows only the battery cells to participate in the series connection in a lump when the battery cells are combined in series-parallel.
The metal connecting devices used for connecting the head end and the tail end of the battery monomer array 14 in the battery pack 8 in series have the functions of overcurrent fusing and protection.
The battery cell array 14 may be a square battery cell array 14, and the square battery cell array 14 is disposed along the thickness direction of the power type polymer lithium ion battery cell. The number of the battery cell arrays 14 may be one array or two arrays, and at most, not more than two arrays are provided.
A reserved space can be arranged between the bag body and the battery monomer array 14 to serve as a safety buffer; the temperature control system 11 is provided with a temperature acquisition system for acquiring the temperature of the power polymer lithium ion battery monomer, and the current connecting lead, the voltage acquisition line and the temperature acquisition system can be arranged in the reserved space; more specifically, the current connection wires, the voltage collection wires, the temperature collection system, and the central board heating assembly connection wires of the plastic structural frame may be arranged in a small-sized space of a structure protruding from the unit assembly fixing holes 6 at both sides of the width of the battery cell array 14, and then concentrated and fixed through the insulation wire groove 13.
The structural material of the battery pack 8 can be one or a combination of light materials such as pure aluminum, aluminum alloy, aluminum profile, engineering plastic, basalt fiber material and the like.
The battery pack 8 has strong rapid charging and discharging capacity, the single battery generates less heat, and the problems of high internal resistance and body heating of the ultra-long battery can be thoroughly solved; the arrangement of the current connecting wires, the voltage collecting wires, the temperature collecting system and the connecting wires of the central plate heating assembly of the plastic structure frame fully utilizes the reserved safety buffer space between the bag body structural member and the two sides of the battery monomer array 14, and is beneficial to the integral arrangement of the battery monomers in the battery bag 8, so that the space utilization rate of the battery bag 8 is improved, the energy density and the charging and discharging power density of the battery bag 8 are enlarged, and the cruising ability and the safety performance of the battery bag 8 are further enhanced; meanwhile, the battery pack 8 cancels the internal parallel connection mode of the batteries, and is beneficial to improving the consistency of the battery units only by adopting the structural design of a plurality of series connections. The battery pack 8 is a battery pack 8 with a module-free CTP structure, and is particularly suitable for a CTC design scheme, namely a structure design scheme that the battery pack 8 and an electric vehicle chassis are combined into a whole.
The following will specifically explain the present invention in conjunction with various embodiments.
Example 1
In the embodiment, the external dimensions of the battery pack 8 are that the length is 1814mm, the width is 1450mm, the thickness is 135mm, the total volume of the battery pack 8 is 349.0155L, the effective volume of the distribution box of the battery pack 8 is 44.52L, the effective volume of the battery pack 8 is 302.1786L, the effective volume of the battery cell array 14 is 188.2335L, the effective volume of the battery cells is 161.6076L, the sum of the occupied volumes of the outer shell of the battery pack 8, the internal battery management system and other power distribution modules is 302.1786-161.6076-140.571L, and the volume utilization rate of the battery cells in the battery pack 8 is 161.6076/302.1786-53.48%. The arrangement mode of the battery monomers in the battery pack 8 is 2 array arrangements: the cell size was 12 × 605 × 105mm, and the cell volume was 0.7623L; the capacity of the single battery is 148AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 532.8WH, the weight of the single battery is 1.691kg, the weight energy density of the single battery is 316.20WH/kg, the volume energy density of the single battery is 698.94WH/L, and the number of the single battery pole groups is one group; the number of the batteries connected in series and in parallel is 1P212S, the voltage of the battery pack 8 is 763.2V, and the highest charging voltage is 890.4V; the weight of the box structural member of the battery pack 8 is 105kg, the weight of the management system and the connecting piece of the battery pack 8 is 59kg, the total weight of the battery monomer is 358.492kg, the total weight of the battery pack 8 is 522.492kg, the weight energy density of the battery pack 8 is 216.18WH/kg, and the volume energy density of the battery pack 8 is 373.80 WH/L; the total charge of the battery pack 8 is 112.9536 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 2
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1450mm in width, 135mm in thickness, 439.0605L in total volume of the battery pack 8, 41.4L in effective volume of a distribution box of the battery pack 8, 385.3926L in effective volume of the battery pack 8, 251.16L in effective volume of the battery cell array 14, 226.8L in effective volume of the battery cells, 385.3926-226.8-158.526L in the total volume occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 58.85% in volume utilization rate of the battery cells in the battery pack 8, 226.8/385.3926. The arrangement mode of the single batteries in the battery pack 8 is 1 array arrangement: the cell size was 16 x 1250 x 105mm, and the cell volume was 2.1L; the capacity of the single battery is 414AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 1490.4WH, the weight of the single battery is 4.713kg, the weight energy density of the single battery is 316.23WH/kg, the volume energy density of the single battery is 709.71WH/L, and the number of pole groups of the single battery is four; the number of the batteries connected in series and in parallel is 1P108S, the voltage of the battery pack 8 is 388.8V, and the highest charging voltage is 453.6V; the weight of the box structural member of the battery pack 8 is 124kg, the weight of the management system and the connecting piece of the battery pack 8 is 70kg, the total weight of the battery monomer is 509.004kg, the total weight of the battery pack 8 is 703.004kg, the weight energy density of the battery pack 8 is 228.96WH/kg, and the volume energy density of the battery pack 8 is 417.66 WH/L; the total charge of the battery pack 8 is 160.9632 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 3
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1450mm in width, 135mm in thickness, 439.0605L in total volume of the battery pack 8, 41.4L in effective volume of a distribution box of the battery pack 8, 385.3926L in effective volume of the battery pack 8, 251.16L in effective volume of the battery cell array 14, 219.5424L in effective volume of the battery cells, 385.3926-219.5424-165.7836L in the sum of the volumes occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 219.5424/385.3926-56.97% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the battery monomers in the battery pack 8 is 2 array arrangements: the cell size was 16 × 605 × 105mm, and the cell volume was 1.0164L; the capacity of the single battery is 200AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 720.00WH, the weight of the single battery is 2.298kg, the weight energy density of the single battery is 313.32WH/kg, the volume energy density of the single battery is 708.38WH/L, and the number of pole groups of the single battery is two; the number of the batteries connected in series and in parallel is 1P216S, the voltage of the battery pack 8 is 777.6V, and the highest charging voltage is 907.2V; the weight of the box structural member of the battery pack 8 is 124kg, the weight of the management system and the connecting piece of the battery pack 8 is 69kg, the total weight of the battery monomer is 496.368kg, the total weight of the battery pack 8 is 689.368kg, the weight energy density of the battery pack 8 is 225.60WH/kg, and the volume energy density of the battery pack 8 is 403.54 WH/L; the total charge of the battery pack 8 is 155.52 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 4
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1450mm in width, 135mm in thickness, 439.0605L in total volume of the battery pack 8, 41.4L in effective volume of a distribution box of the battery pack 8, 385.3926L in effective volume of the battery pack 8, 251.16L in effective volume of the battery cell array 14, 224.175L in effective volume of the battery cells, 385.3926-224.175-161.151L in the sum of the volumes occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 224.175/385.3926-58.17% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the single batteries in the battery pack 8 is 1 array arrangement: the cell size was 14 x 1250 x 105mm, and the cell volume was 1.8375L; the capacity of the single battery is 356AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 1281.6WH, the weight of the single battery is 4.071kg, the weight energy density of the single battery is 314.81WH/kg, the volume energy density of the single battery is 697.47WH/L, and the number of pole groups of the single battery is four; the number of the batteries connected in series and in parallel is 1P122S, the voltage of the battery pack 8 is 439.2V, and the highest charging voltage is 512.4V; the weight of the box structural member of the battery pack 8 is 124kg, the weight of the management system and the connecting piece of the battery pack 8 is 73kg, the total weight of the battery monomer is 496.662kg, the total weight of the battery pack 8 is 693.662kg, the weight energy density of the battery pack 8 is 225.41WH/kg, and the volume energy density of the battery pack 8 is 405.70 WH/L; the total charge of the battery pack 8 is 156.3552 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 5
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1450mm in width, 135mm in thickness, 439.0605L in total volume of the battery pack 8, 41.4L in effective volume of a distribution box of the battery pack 8, 385.3926L in effective volume of the battery pack 8, 251.16L in effective volume of the battery cell array 14, 224.175L in effective volume of the battery cells, 385.3926-224.175-161.151L in the sum of the volumes occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 224.175/385.3926-58.17% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the single batteries in the battery pack 8 is 1 array arrangement: the cell size was 14 x 1250 x 105mm, and the cell volume was 1.8375L; the capacity of the single battery is 240AH, the voltage of the single battery is 3.20V, the electric quantity of the single battery is 768.00WH, the weight of the single battery is 3.577kg, the weight energy density of the single battery is 214.71WH/kg, the volume energy density of the single battery is 417.96WH/L, and the number of pole groups of the single battery is four; the number of the batteries connected in series and in parallel is 1P122S, the voltage of the battery pack 8 is 390.4V, and the highest charging voltage is 451.4V; the weight of the box structural member of the battery pack 8 is 124kg, the weight of the management system and the connecting piece of the battery pack 8 is 73kg, the total weight of the battery monomer is 436.394kg, the total weight of the battery pack 8 is 633.394kg, the weight energy density of the battery pack 8 is 147.93WH/kg, and the volume energy density of the battery pack 8 is 243.12 WH/L; the total charge of the battery pack 8 is 93.696 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 6
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1586mm in width, 135mm in thickness, 470.74797L in total volume of the battery pack 8, 46.296L in effective volume of a distribution box of the battery pack 8, 415.758L in effective volume of the battery pack 8, 269.29L in effective volume of the battery cell array 14, 235.173L in effective volume of the battery cells, 415.758-225.173-180.585L in the sum of the occupied volumes of the outer shell of the battery pack 8, an internal battery management system and other power distribution modules, and 235.173/415.758-56.56% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the battery monomers in the battery pack 8 is 2 array arrangements: the cell size was 16 × 673 × 105mm, and the cell volume was 1.13064L; the capacity of the single battery is 150AH, the voltage of the single battery is 3.20V, the electric quantity of the single battery is 480.00WH, the weight of the single battery is 2.300kg, the weight energy density of the single battery is 208.70WH/kg, the volume energy density of the single battery is 424.54WH/L, and the number of pole groups of the single battery is two; the number of the batteries connected in series and in parallel is 1P208S, the voltage of the battery pack 8 is 665.6V, and the highest charging voltage is 769.6V; the weight of the box structural member of the battery pack 8 is 133kg, the weight of the management system and the connecting piece of the battery pack 8 is 74kg, the total weight of the battery monomer is 478.40kg, the total weight of the battery pack 8 is 685.40kg, the weight energy density of the battery pack 8 is 145.67WH/kg, and the volume energy density of the battery pack 8 is 240.14 WH/L; the total charge of the battery pack 8 is 99.84 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 7
In the embodiment, the external dimensions of the battery pack 8 are 2274mm in length, 1586mm in width, 135mm in thickness, 470.74797L in total volume of the battery pack 8, 46.296L in effective volume of a distribution box of the battery pack 8, 415.758L in effective volume of the battery pack 8, 269.29L in effective volume of the battery cell array 14, 235.173L in effective volume of the battery cells, 415.758-225.173-180.585L in the sum of the occupied volumes of the outer shell of the battery pack 8, an internal battery management system and other power distribution modules, and 235.173/415.758-56.56% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the battery monomers in the battery pack 8 is 2 array arrangements: the cell size was 16 × 673 × 105mm, and the cell volume was 1.13064L; the capacity of the single battery is 222AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 799.20WH, the weight of the single battery is 2.530kg, the weight energy density of the single battery is 315.89WH/kg, the volume energy density of the single battery is 706.86WH/L, and the number of pole groups of the single battery is two; the number of the batteries connected in series and in parallel is 1P208S, the voltage of the battery pack 8 is 748.8V, and the highest charging voltage is 873.6V; the weight of the box structural member of the battery pack 8 is 133kg, the weight of the management system and the connecting piece of the battery pack 8 is 74kg, the total weight of the battery monomer is 526.24kg, the total weight of the battery pack 8 is 733.24kg, the weight energy density of the battery pack 8 is 226.71WH/kg, and the volume energy density of the battery pack 8 is 399.83 WH/L; the total charge of the battery pack 8 is 166.2336 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 8
In the embodiment, the external dimensions of the battery pack 8 are 2630mm in length, 1380mm in width, 135mm in thickness, 483.394L in total volume of the battery pack 8, 40.32L in effective volume of a distribution box of the battery pack 8, 425.979L in effective volume of the battery pack 8, 282.9677L in effective volume of the battery cell array 14, 253.2516L in effective volume of the battery cells, 425.979-253.2516-172.5864L in the sum of the volumes occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 253.2516/425.979-59.45% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the single batteries in the battery pack 8 is 1 array arrangement: the cell size was 14 x 1180 x 105mm, and the cell volume was 1.7346L; the capacity of the single battery is 226AH, the voltage of the single battery is 3.20V, the electric quantity of the single battery is 723.20WH, the weight of the single battery is 3.371kg, the weight energy density of the single battery is 214.54WH/kg, the volume energy density of the single battery is 416.93WH/L, and the number of pole groups of the single battery is four; the number of the batteries connected in series and in parallel is 1P146S, the voltage of the battery pack 8 is 467.2V, and the highest charging voltage is 540.2V; the weight of the box structural member of the battery pack 8 is 137kg, the weight of the management system and the connecting piece of the battery pack 8 is 82kg, the total weight of the battery monomer is 492.166kg, the total weight of the battery pack 8 is 711.166kg, the weight energy density of the battery pack 8 is 148.47WH/kg, and the volume energy density of the battery pack 8 is 247.87 WH/L; the total charge of the battery pack 8 is 105.5872 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Example 9
In the embodiment, the external dimensions of the battery pack 8 are 2630mm in length, 1380mm in width, 135mm in thickness, 483.394L in total volume of the battery pack 8, 40.32L in effective volume of a distribution box of the battery pack 8, 425.979L in effective volume of the battery pack 8, 282.9677L in effective volume of the battery cell array 14, 253.2516L in effective volume of the battery cells, 425.979-253.2516-172.5864L in the sum of the volumes occupied by the outer shell of the battery pack 8, the internal battery management system and other power distribution modules, and 253.2516/425.979-59.45% in volume utilization rate of the battery cells in the battery pack 8. The arrangement mode of the single batteries in the battery pack 8 is 1 array arrangement: the cell size was 14 x 1180 x 105mm, and the cell volume was 1.7346L; the capacity of the single battery is 226AH, the voltage of the single battery is 3.20V, the electric quantity of the single battery is 723.20WH, the weight of the single battery is 3.371kg, the weight energy density of the single battery is 214.54WH/kg, the volume energy density of the single battery is 416.93WH/L, and the number of pole groups of the single battery is four; the number of the batteries connected in series and in parallel is 1P146S, the voltage of the battery pack 8 is 467.2V, and the highest charging voltage is 540.2V; the weight of the box structural member of the battery pack 8 is 137kg, the weight of the management system and the connecting piece of the battery pack 8 is 82kg, the total weight of the battery monomer is 492.166kg, the total weight of the battery pack 8 is 711.166kg, the weight energy density of the battery pack 8 is 148.47WH/kg, and the volume energy density of the battery pack 8 is 247.87 WH/L; the total charge of the battery pack 8 is 105.5872 KWH. Charging the battery pack 8: the functions of super charging of 20-90% SOC and slow charging for 4h are realized within 6-10 min; the battery pack 8 has a continuous discharge rate of 6-10C and a peak discharge power of 12-20C.
Comparative example 1
In the embodiment, the external dimensions of the battery pack 8 are that the length is 1814mm, the width is 1450mm, the thickness is 135mm, the total volume of the battery pack 8 is 349.0155L, the effective volume of the distribution box of the battery pack 8 is 44.52L, the effective volume of the battery pack 8 is 302.1786L, the effective volume of the battery cell array 14 is 188.2335L, the effective volume of the battery cells is 161.6076L, the sum of the occupied volumes of the outer shell of the battery pack 8, the internal battery management system and other power distribution modules is 302.1786-161.6076-140.571L, and the volume utilization rate of the battery cells in the battery pack 8 is 161.6076/302.1786-53.48%. The arrangement mode of the battery monomers in the battery pack 8 is 2 array arrangements: the cell size was 12 × 605 × 105mm, and the cell volume was 0.7623L; the capacity of a single battery is 148AH, the voltage of the single battery is 3.60V, the electric quantity of the single battery is 532.8WH, the weight of the single battery is 1.685kg, the weight energy density of the single battery is 316.20WH/kg, the volume energy density of the single battery is 698.94WH/L, and the number of groups of single battery poles is one group; the number of the batteries connected in series and in parallel is 1P212S, the voltage of the battery pack 8 is 763.2V, and the highest charging voltage is 890.4V; the weight of the box structural member of the battery pack 8 is 105kg, the weight of the management system and the connecting piece of the battery pack 8 is 59kg, the total weight of the battery monomer is 357.22kg, the total weight of the battery pack 8 is 521.22kg, the weight energy density of the battery pack 8 is 216.71WH/kg, and the volume energy density of the battery pack 8 is 373.80 WH/L; the total charge of the battery pack 8 is 112.9536 KWH. Charging the battery pack 8: the function of 20-90% SOC and 4h slow charging and full filling is realized in 20-30 min; the battery pack 8 has only continuous discharge rates of 1-3C and peak discharge power of 4-6C.
Specific parameters of examples 1 to 9 and comparative example 1 are shown in tables 1 and 2.
TABLE 1
| Item | Comparative example 1 | Example 1 | Example 2 | Example 3 | Example 4 |
| External dimension of battery pack | 1814*1450*135mm | 1814*1450*135mm | 2274*1450*135mm | 2274*1450*135mm | 2274*1450*135mm |
| Effective volume of battery pack | 302.1786L | 302.1786L | 385.3926L | 385.3926L | 385.3926L |
| Effective area of battery array | 188.2335L | 188.2335L | 251.16L | 251.16L | 251.16L |
| Number of battery arrays | 2 are provided with | 2 are provided with | 1 is provided with | 2 are provided with | 1 is provided with |
| Cell effective volume | 161.6076L | 161.6076L | 226.80L | 219.5424L | 224.175L |
| Battery cell volume utilization | 53.48％ | 53.48％ | 58.85％ | 56.97％ | 58.17％ |
| Battery pack structural member weight | 105kg | 105kg | 124kg | 124kg | 124kg |
| Battery pack supportWeight of the attachment | 59kg | 59kg | 70kg | 69kg | 73kg |
| Volume of battery distribution box | 44.52L | 44.52L | 41.4L | 41.4L | 41.4L |
| Cell weight | 1.685kg | 1.691kg | 4.713kg | 2.298kg | 4.071kg |
| Number of serial single batteries | 1P212S | 1P212S | 1P108S | 1P216S | 1P122S |
| Total weight of battery cell | 357.22kg | 358.492kg | 509.004kg | 496.368kg | 496.662kg |
| Battery monomerSize of | 12*605*105mm | 12*605*105mm | 16*1250*105mm | 16*605*105mm | 14*1250*105mm |
| Cell volume | 0.7623L | 0.7623L | 2.10000L | 1.0164L | 1.8375L |
| Cell capacity of battery | 148AH | 148AH | 414AH | 200AH | 356AH |
| Number of battery cell positive and negative pole sets | 1 | 2 | 4 | 2 | 4 |
| Cell voltage | 3.60V | 3.60V | 3.60V | 3.60V | 3.60V |
| Electric quantity of battery | 532.8WH | 532.8WH | 1490.4WH | 720.00WH | 1281.6WH |
| Energy density of battery cell weight | 316.20WH/KG | 315.80WH/KG | 316.23WH/KG | 313.32WH/KG | 314.81WH/KG |
| Volumetric energy density of battery cell | 698.94WH/L | 698.94WH/L | 709.71WH/L | 708.38WH/L | 697.47WH/L |
| Total weight of battery pack | 521.22kg | 522.492kg | 703.004kg | 689.368kg | 693.662kg |
| Weight energy density of battery pack | 216.71WH/KG | 216.18WH/KG | 228.96WH/KG | 225.60WH/KG | 225.41WH/KG |
| Volumetric energy density of battery pack | 373.80WH/L | 373.80WH/L | 417.66WH/L | 403.54WH/L | 405.70WH/L |
| Total voltage of battery pack | 763.2V | 763.2V | 388.8V | 777.6V | 439.2V |
| Maximum charging voltage of battery pack | 890.4V | 890.4V | 453.6V | 907.2V | 512.4V |
| Total electric quantity of battery pack | 112.9536KWH | 112.9536KWH | 160.9632KWH | 155.52KWH | 156.3552KWH |
| Continuous discharge rate of battery pack | 1-3C | 6-10C | 6-10C | 6-10C | 6-10C |
| Peak discharge rate of battery pack | 4-6C | 12-20C | 12-20C | 12-20C | 12-20C |
| Conventional charging mode | Slowly charging for 4h | Fast charging for 1 h/slow charging for 4h | Fast charging for 1 h/slow charging for 4h | Fast charging for 1 h/slow charging for 4h | Fast charging for 1 h/slow charging for 4h |
| 20% -90% SOC overcharging mode | 20-30min | 6-10min | 6-10min | 6-10min | 6-10min |
| Wireless charging mode | Slowly charging for 4-6h | Slowly charging for 4-6h | Slowly charging for 4-6h | Slowly charging for 4-6h | Slowly charging for 4-6h |
TABLE 2
The battery cells and the battery packs of examples 1 to 9 and comparative example 1 were all of the common sizes currently used by domestic and foreign head enterprises.
Through the analysis of the data of the comparative example 1 and the data of the examples 1 to 9, the single battery and the battery pack provided by the invention have the advantages that the weight energy density, the volume energy density, the charge-discharge power density, the electric quantity of the battery pack and the like are greatly improved compared with the conventional method, the improvement effect is obvious, and the endurance mileage of the pure electric vehicle can reach 700 + 1100 km:
1) the size universal battery pack in the comparative example 1 and the examples 1 to 5 is manufactured by 590 modules formed by combining batteries with single voltage of 3.6V at present, the capacity of the battery pack is different from 82KWH to 110KWH, the available electric quantity of the battery single and the battery pack can reach 112KWH to 160KWH under the condition of unchanged volume, the lifting amplitude is 35 to 45 percent, and the weight energy density of the battery pack is greater than 216 WH/kg. The battery pack formed by combining the 3.2V lithium iron batteries can also reach the available electric quantity of 95-100KWH, is improved by more than 16 percent compared with the existing general battery pack, and has the weight energy density of more than 145 WH/kg. The effective utilization of the cell volume in the battery pack (excluding the battery separator volume) reaches a high level approaching 60%, and decreases with the increase in the number of arrays.
2) The battery pack with the size of the embodiment 8-9 is a battery pack adopted by a certain well-known enterprise in China, and is formed by directly combining lithium iron batteries with the single voltage of 3.2V at present, the capacity of the battery pack is about 74KWH, the available electric quantity of the battery single and the battery pack can reach 105.587KWH under the condition that the same battery system is unchanged in volume, the lifting amplitude is larger than 42%, and the weight energy density of the battery pack reaches 148.47 WH/kg. The available electric quantity of the battery pack formed by combining the ternary battery monomers with the monomer voltage of 3.6V can reach 176.6KWH, the promotion amplitude is larger than 138%, and the weight energy density of the battery pack reaches 226.43 WH/kg.
3) According to the invention, the battery monomer and the battery pack both support a full charge mode of quick charge for 1 h/slow charge for 4h, and the battery pack 8 adopting the system design scheme can also realize a 20-90% SOC super quick charge mode within 6-10 min.
4) According to the battery cell and the battery pack, both 6-10C of continuous discharge power and 12-20C of peak discharge power can be realized.
5) According to the invention, the battery monomer and the battery pack both support a wireless charging function, and the charging power is selected mainly in a slow charging mode.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The power type polymer lithium ion battery monomer is characterized by comprising a battery body, wherein the battery body is formed by stacking a battery cell, positive and negative pole pieces of the battery cell are provided with more than two groups of positive and negative pole flow guide lugs, the positive and negative pole flow guide lugs are positioned on the top end surface in the height direction of the battery cell, the battery body is sealed and packaged by an aluminum-plastic composite film, and the power type polymer lithium ion battery monomer is provided with a width L, a height H and a thickness D, wherein the width L is greater than the height H, the height H is greater than the thickness D, the width L is 600 + 2600mm, and the L/H is 7-35.
2. The power polymer lithium ion battery cell of claim 1, further comprising a busbar welded to the positive and negative electrode current-conducting tabs to connect the power polymer lithium ion battery cells in series.
3. The monomer for the dynamic polymer lithium ion battery as claimed in claim 1, wherein the distance between the positive and negative electrode current-guiding tabs of adjacent homopolar electrodes is 250-400 mm.
4. A power type polymer lithium ion battery monomer assembly is characterized by comprising an I-shaped plastic frame and two power type polymer lithium ion battery monomers according to any one of claims 1 to 3, wherein the two power type polymer lithium ion battery monomers are oppositely fixed on two sides of a central plate of the I-shaped plastic frame, an elastic insulating and heat-insulating plate is arranged on the outer side of each power type polymer lithium ion battery monomer, and the inner side of each power type polymer lithium ion battery monomer is fixed on the central plate of the I-shaped plastic frame in an insulating mode through heat-conducting glue.
5. The dynamic polymer lithium ion battery cell assembly according to claim 4, wherein a plurality of fixing holes for fixing the dynamic polymer lithium ion battery cell assembly into a battery cell array are formed on the I-shaped plastic frame.
6. The power type polymer lithium ion battery cell assembly according to claim 4, wherein a heat generating assembly is disposed on the central plate of the I-shaped plastic frame, and the heat generating assembly can heat the power type polymer lithium ion battery cell when the temperature of the power type polymer lithium ion battery cell is lower than a set temperature.
7. A battery pack is characterized by comprising a pack body and a battery monomer array, wherein the battery monomer array comprises a plurality of power type polymer lithium ion battery monomer assemblies as claimed in any one of claims 4 to 6, the plurality of power type polymer lithium ion battery monomer assemblies are fixed into the battery monomer array through fixing pieces, a placing area is arranged in the pack body, and the battery monomer array is fixedly placed in the placing area of the pack body.
8. The battery pack according to claim 7, further comprising a temperature control system disposed on top of the battery cell array for cooling the positive and negative electrode tabs, wherein an elastic insulating and heat conducting rubber pad is disposed between the temperature control system and the battery cell array.
9. The battery pack according to claim 8, wherein the battery cell array is a square battery cell array disposed in a thickness direction of the power polymer lithium ion battery cell.
10. The battery pack of claim 9, wherein a headspace is provided between the pack body and the battery cell array; the temperature control system is provided with a temperature acquisition system for acquiring the temperature of the power polymer lithium ion battery monomer, and the current connecting lead, the voltage acquisition line and the temperature acquisition system are arranged in the reserved space.
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