CN110217090A - A kind of battery case subiculum disc assembly and its processing method - Google Patents
A kind of battery case subiculum disc assembly and its processing method Download PDFInfo
- Publication number
- CN110217090A CN110217090A CN201910357838.9A CN201910357838A CN110217090A CN 110217090 A CN110217090 A CN 110217090A CN 201910357838 A CN201910357838 A CN 201910357838A CN 110217090 A CN110217090 A CN 110217090A
- Authority
- CN
- China
- Prior art keywords
- plate
- lower tray
- stringer
- water
- battery case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 210000001320 hippocampus Anatomy 0.000 title claims abstract description 17
- 238000003672 processing method Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 210000003734 kidney Anatomy 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 6
- 238000001962 electrophoresis Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000030279 gene silencing Effects 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 206010040844 Skin exfoliation Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
A kind of battery case subiculum disc assembly, lower tray are set as the frame structure surrounded by front side board, back side panel, left plate, right side plate, several vehicle mounting racks are provided on the outside of frame structure;Lower tray is internally provided with about the four rectangular mold groups communicated, is provided with stringer between adjacent rectangular mold group, several positioning columns are provided on stringer;Water-cooled plate is fixed in rectangular mold group by rectangular mold group positioning pin;It is provided with foot guard plate below water-cooled plate, maze trough is provided on foot guard plate, several kidney slots is provided between maze trough;Disengaging water nozzle is connected with water-cooled plate;Upper cover plate is provided with seal groove, and matched sealing joint strip is provided in seal groove;Structure of the invention is reasonable, securely and reliably, can effectively reduce cell heat aggregation, play protective effect to battery, substantially increase the service performance of battery, extend the service life of battery.
Description
Technical field
The present invention relates to the field of pallet more particularly to a kind of battery case subiculum disc assembly and its processing methods.
Background technique
When vehicle is with different operating condition downward drivings, battery can output amount of heat;Along with accumulated time and spacial influence,
Uneven heat aggregation can be generated, it is complicated and changeable so as to cause battery operation environment.Since battery is intensively put, intermediate region heat
Amount aggregation, fringe region is less, leads in battery pack that each monomer temperature is unbalanced, aggravates each battery module monomer internal resistance and capacity
It is inconsistent.It accumulates for a long time, will cause percentage of batteries and overcharge and over-discharge, and then influence performance and the service life of battery, serious meeting
Cause security risk.The battery case lower tray of the prior art has a single function, and only plays supporting role, and can not extend battery
Useful effect is played in service life;And the battery case subiculum dish structure of the prior art is easily damaged, and service life is short, therefore
Need to design a kind of new battery case subiculum dish structure.
Summary of the invention
It is an object of the present invention to provide a kind of battery case subiculum disc assembly and its processing method, design can be battery rationally
Mould group, water-cooling system, harness, BMS bracket, upper housing provide installation fixed point, and can provide outer protection for battery modules,
Solves the above technical problem.
In order to achieve the above technical purposes, reach above-mentioned technical requirements, the technical scheme adopted by the invention is that: it is a kind of
Battery case subiculum disc assembly, it is characterised in that: including lower tray, upper cover plate;Lower tray is set as by front side board, back side panel, a left side
The frame structure that side plate, right side plate surround is provided with several vehicle mounting racks on the outside of frame structure;The lower tray
About the four rectangular mold groups communicated are internally provided with, rectangular mold group two sides are provided with several mould group bolt fixing holes, adjacent
Rectangular mold group between be provided with stringer, several positioning columns are provided on stringer;Water-cooled plate is solid by rectangular mold group positioning pin
It is scheduled in rectangular mold group;Casing a and casing b are provided in water-cooled plate;Foot guard plate, foot guard are provided with below water-cooled plate
Plate is connected to a fixed by bolt and lower tray;It is provided with maze trough on the foot guard plate, is arranged between maze trough
There are several kidney slots;Disengaging water nozzle is connected with water-cooled plate;The upper cover plate is provided with seal groove, seal groove circumferential distribution
There are several upper cover plate mounting holes, is provided with matched sealing joint strip in seal groove.
Preferred: the front side board is provided with boss, communicates inside boss and lower tray;The back side panel is provided with
Insulating paper.
Preferred: the stringer includes the first stringer, the second stringer, third stringer;Wherein symmetrically set on the second stringer
Pallet hangs column there are two setting.
Preferred: the height of the casing a is greater than the height of casing b.
A kind of processing method of battery case subiculum disc assembly, it is characterised in that: including following procedure of processing;Step 1 is bored
Milling Machining lower tray reverse side is grounded string holes, baffle at bottom mounting hole;
Step 2, drilling and milling lower tray mould group face and the stirring face of weld;
Step 3 mills the boss face of lower tray side;
Step 4, by spot welding between lower tray and water-cooled plate, agitating friction weldering;
Step 5 mills the sling point of drill jig group mounting hole and surrounding;
Step 6 processes upper cover plate mounting hole, seal groove, sling point threaded hole;
Step 7, bottom plate spray anti-stone and hit glue, carry out anti-stone to the foot guard board group part after electrophoresis and hit glue spraying, coating thickness is
1mm;
Mould group positioning pin, steel-wire screw-socket and insulating paper are installed in lower tray by step 8;
Step 9, the inspection of pallet gas carry out air-leakage test to the cabinet after friction welding (FW), when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 10 applies sealant, polyacrylate sealant is applied to as required in upper cover seal groove, and is solidified;
Step 11, secondary gas inspection, carries out air-leakage test to the cabinet after gluing, when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 12 applies damping rubber, applies damping rubber at baffle at bottom convex closure position;
Step 13 installs silencing cotton, bottom plate, foot guard plate is bolted in lower tray;
Step 14 is examined, cleaning, delivery.
Beneficial effects of the present invention;A kind of battery case subiculum disc assembly, compared with traditional structure: being provided with water-cooled plate, water
Cold plate is fixed in rectangular mold group by rectangular mold group positioning pin;Disengaging water nozzle is connected with water-cooled plate;Can persistently to pallet into
Row water cooling, to achieve the purpose that radiate to battery;It is provided with foot guard plate below water-cooled plate, foot guard plate passes through bolt
It is connected to a fixed with lower tray, keeps structure more stable;It is provided with maze trough on foot guard plate, if being provided between maze trough
Dry kidney slot;It has a safety feature, effectively reduces security risk;Structure of the invention is reasonable, securely and reliably, can effectively reduce electricity
The aggregation of pond heat, plays protective effect to battery, substantially increases the service performance of battery, extend the service life of battery;
Processing method of the invention is simple and reliable, and the battery case lower tray quality using this method processing is stablized, long service life, simultaneously
Reduce use cost.
Detailed description of the invention
Fig. 1 is lower tray assembly structure schematic diagram of the present invention;
Fig. 2 is lower tray structural schematic diagram of the present invention;
Fig. 3 is B-B cross-sectional view in Fig. 1 of the present invention;
Fig. 4 is the bottom view of Fig. 3 of the present invention;
Fig. 5 is upper cover plate schematic diagram of the present invention;
Fig. 6 is A-A schematic diagram in Fig. 5 of the present invention;
In figure: 1. lower trays;2. front side board;3. back side panel;4. left plate;5. right side plate;6. vehicle mounting rack;7. rectangular mold
Group;8. mould group bolt fixing hole;9. stringer;10. positioning column;11. water-cooled plate;12. casing a;13. casing b;14. foot guard
Plate;15. maze trough;16. kidney slot;17. passing in and out water nozzle;18. upper cover plate;19. boss;20. insulating paper;21. pallet hangs column;
22. seal groove;23. sealing joint strip.
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and its advantageous effects, below in conjunction with attached drawing
And specific embodiment, the present invention will be described in further detail;
In the accompanying drawings: a kind of battery case subiculum disc assembly, it is characterised in that: including lower tray 1, upper cover plate 18;Lower tray 1 is arranged
For the frame structure surrounded by front side board 2, back side panel 3, left plate 4, right side plate 5, several are provided on the outside of frame structure
Vehicle mounting rack 6;The lower tray 1 is internally provided with about the four rectangular mold groups 7 communicated, and 7 two sides of rectangular mold group are set
Several mould group bolt fixing holes 8 are equipped with, stringer 9 is provided between adjacent rectangular mold group 7, is provided with several on stringer 9
Positioning column 10;Water-cooled plate 11 is fixed in rectangular mold group 7 by rectangular mold group positioning pin;Casing a12 is provided in water-cooled plate 11
With casing b13;Foot guard plate 14 is provided with below water-cooled plate 11, foot guard plate 14 is connected by bolt with lower tray 1
It is fixed;It is provided with maze trough 15 on the foot guard plate 14, several kidney slots 16 are provided between maze trough 15;Into
Faucet 17 is connected with water-cooled plate 11;The upper cover plate 18 is provided with seal groove, and seal groove circumferential distribution has on several
Cover board mounting hole is provided with matched sealing joint strip in seal groove.
The front side board 2 is provided with boss 19, communicates inside boss 19 and lower tray 1;The back side panel 3 is provided with
Insulating paper 20;The stringer 9 includes the first stringer 9-1, the second stringer 9-2, third stringer 9-3;Wherein on the second stringer 9-2
Pallet hangs column 21 there are two being symmetrical arranged;The height of the casing a12 is greater than the height of casing b13.
A kind of processing method of battery case subiculum disc assembly, it is characterised in that: including following procedure of processing;Step 1 is bored
Milling Machining lower tray reverse side is grounded string holes, baffle at bottom mounting hole;
Step 2, drilling and milling lower tray mould group face and the stirring face of weld;
Step 3 mills the boss face of lower tray side;
Step 4, by spot welding between lower tray and water-cooled plate, agitating friction weldering;
Step 5 mills the sling point of drill jig group mounting hole and surrounding;
Step 6 processes upper cover plate mounting hole, seal groove, sling point threaded hole;
Step 7, bottom plate spray anti-stone and hit glue, carry out anti-stone to the foot guard board group part after electrophoresis and hit glue spraying, coating thickness is
1mm;
Mould group positioning pin, steel-wire screw-socket and insulating paper are installed in lower tray by step 8;
Step 9, the inspection of pallet gas carry out air-leakage test to the cabinet after friction welding (FW), when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 10 applies sealant, polyacrylate sealant is applied to as required in upper cover seal groove, and is solidified;
Step 11, secondary gas inspection, carries out air-leakage test to the cabinet after gluing, when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 12 applies damping rubber, applies damping rubber at baffle at bottom convex closure position;
Step 13 installs silencing cotton, bottom plate, foot guard plate is bolted in lower tray;
Step 14 is examined, cleaning, delivery.
Specific implementation of the invention: pallet assembly carries out 100% airtight detection, it is ensured that shell is without out-of-flatness, misalignment, sharp
The surface defects such as side, burr, stomata, bubble, pit, crackle, wave, warpage, flawless, owe the internal flaws such as casting at cold shut;Institute
There are impulse- free robustness at trimming, edge of acute angle etc.;Blank must carry out sight check and dimension control when offline, reject defect blank;Respectively
Workpiece should ensure that spot of the surface without any rust stain and any influence welding before welding;Impulse- free robustness, welding slag, gas at each solder joint
Hole, crackle etc.;Housing assembly is without surface defects such as scuffing, point, orange peel, sagging, bubble, peelings;To pallet assembly inner surface
Insulation processing is carried out, and avoids being surface-treated the influence to grounding point, insulation coating layer thickness is uniformly, appearance is without obvious scratch;Really
Guarantor conducts that performance is intact, and it is 50Hz+/- 5Hz industrial frequency withstand voltage that insulation, which should be able to bear frequency, can also use DC voltage
1.4 times of alternating voltage virtual value (experimental voltage be), should not occur puncturing or flashover;Die-casting blank material uses
A356, meanwhile, spray executes 100% ray detection;The rivet nut that pallet is connect with upper cover should ensure that 8.8 grades or more
Strength grade should bear 6NM or more torque, and guarantee 30% or more safe clearance, supports no less than 20 dismounting, has
With the electrochemical anti-corrosive coating of aluminium alloy ontology;Module installation screw thread should ensure that 10.9 grades or more strength grades, should bear
12NM or more torque, and guarantee 30% or more safe clearance, it supports no less than 20 dismounting, has and aluminium alloy ontology
Electrochemical anti-corrosive coating;Housing face degree guarantees to be 0.8mm, System planes degree 1.5mm or less;Shell can not do entirety
Electrophoresis locally does insulation processing, reaches at least requirement for anticorrosion in 720 hours;Sheet metal component needs participate in shell after completing electrophoresis
Installation;Foot guard plate assembly is metal plate weldment assembly, is bolted after electrophoresis with shell, and torque is installed
8.5N.m, institute must satisfy at least requirement for anticorrosion in 720 hours using bolt;The spiral shell for vehicle ground line installation on pallet
Bolt need to equally meet at least requirement for anticorrosion in 720 hours.
Above embodiment is only intended to clearly illustrate description made by the present invention, and not to the limit of embodiment
It is fixed, to those of ordinary skill in the art, other various forms of variations can also be made on the basis of the above description
Or change, there is no necessity and possibility to exhaust all the enbodiments, and the obvious variation thus amplified out
Or it changes and is still in the protection scope of this invention.
Claims (5)
1. a kind of battery case subiculum disc assembly, it is characterised in that: including lower tray (1), upper cover plate (18);Lower tray (1) setting
Outside for the frame structure surrounded by front side board (2), back side panel (3), left plate (4), right side plate (5), frame structure is arranged
There are several vehicle mounting racks (6);The lower tray (1) is internally provided with about the four rectangular mold groups (7) communicated, square
Shape mould group (7) two sides are provided with several mould group bolt fixing holes (8), are provided with stringer between adjacent rectangular mold group (7)
(9), several positioning columns (10) are provided on stringer (9);Water-cooled plate (11) is fixed on rectangular mold by rectangular mold group positioning pin
In group (7);Water-cooled plate is provided with casing a(12 on (11)) and casing b(13);Foot guard plate is provided with below water-cooled plate (11)
(14), foot guard plate (14) is connected to a fixed by bolt with lower tray (1);It is provided on the foot guard plate (14)
Maze trough (15) is provided with several kidney slots (16) between maze trough (15);Pass in and out water nozzle (17) and water-cooled plate (11) phase
Connection;The upper cover plate (18) is provided with seal groove (22), and seal groove circumferential distribution has several upper cover plate mounting holes, sealing
Matched sealing joint strip (23) are provided in slot.
2. a kind of battery case subiculum disc assembly according to claim 1, it is characterised in that: front side board (2) setting
Have boss (19), is communicated inside boss (19) and lower tray (1);The back side panel (3) is provided with insulating paper (20).
3. a kind of battery case subiculum disc assembly according to claim 1, it is characterised in that: the stringer (9) includes the
One stringer (9-1), the second stringer (9-2), third stringer (9-3);Pallet there are two being wherein symmetrical arranged on the second stringer (9-2)
It hangs column (21).
4. a kind of battery case subiculum disc assembly according to claim 1, it is characterised in that: the casing a(12) height
Height of the degree greater than casing b(13).
5. a kind of processing method of battery case subiculum disc assembly, it is characterised in that: including following procedure of processing;Step 1 bores milling
It processes lower tray reverse side and is grounded string holes, baffle at bottom mounting hole;
Step 2, drilling and milling lower tray mould group face and the stirring face of weld;
Step 3 mills the boss face of lower tray side;
Step 4, by spot welding between lower tray and water-cooled plate, agitating friction weldering;
Step 5 mills the sling point of drill jig group mounting hole and surrounding;
Step 6 processes upper cover plate mounting hole, seal groove, sling point threaded hole;
Step 7, bottom plate spray anti-stone and hit glue, carry out anti-stone to the foot guard board group part after electrophoresis and hit glue spraying, coating thickness is
1mm;
Mould group positioning pin, steel-wire screw-socket and insulating paper are installed in lower tray by step 8;
Step 9, the inspection of pallet gas carry out air-leakage test to the cabinet after friction welding (FW), when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 10 applies sealant, polyacrylate sealant is applied to as required in upper cover seal groove, and is solidified;
Step 11, secondary gas inspection, carries out air-leakage test to the cabinet after gluing, when meeting pressure > 6Kpa, leakage rate≤
25ml/min or 18Pa/min;
Step 12 applies damping rubber, applies damping rubber at baffle at bottom convex closure position;
Step 13 installs silencing cotton, bottom plate, foot guard plate is bolted in lower tray;
Step 14 is examined, cleaning, delivery.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201910357838.9A CN110217090A (en) | 2019-04-30 | 2019-04-30 | A kind of battery case subiculum disc assembly and its processing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910357838.9A CN110217090A (en) | 2019-04-30 | 2019-04-30 | A kind of battery case subiculum disc assembly and its processing method |
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Publication Number | Publication Date |
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CN110217090A true CN110217090A (en) | 2019-09-10 |
Family
ID=67820191
Family Applications (1)
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CN201910357838.9A Pending CN110217090A (en) | 2019-04-30 | 2019-04-30 | A kind of battery case subiculum disc assembly and its processing method |
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CN (1) | CN110217090A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110899953A (en) * | 2019-11-12 | 2020-03-24 | 广东省焊接技术研究所(广东省中乌研究院) | Friction stir welding process for thin-wall battery tray |
EP4089819A1 (en) * | 2021-05-11 | 2022-11-16 | CALB Co., Ltd. | Battery pack case, battery pack including the same and vehicle including battery pack |
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CN109103373A (en) * | 2018-08-01 | 2018-12-28 | 上海联谊汽车零部件有限公司 | New energy car battery box with water-cooled plate Yu floor combination structure |
CN109461991A (en) * | 2018-11-23 | 2019-03-12 | 湖南海铝汽车工业有限公司 | A kind of new-energy automobile integral type installation Battery case |
CN210416193U (en) * | 2019-04-30 | 2020-04-28 | 江苏恒义汽配制造有限公司 | Tray assembly under battery box |
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2019
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WO2010136861A1 (en) * | 2009-05-26 | 2010-12-02 | Nissan Motor Co., Ltd. | Vehicle battery cooling structure |
CN103730616A (en) * | 2014-01-24 | 2014-04-16 | 大连理工大学 | Corrugated sandwich protective structure of battery box of electric vehicle |
WO2018090857A1 (en) * | 2016-11-18 | 2018-05-24 | 比亚迪股份有限公司 | Power battery base carrier and power battery module |
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CN109461991A (en) * | 2018-11-23 | 2019-03-12 | 湖南海铝汽车工业有限公司 | A kind of new-energy automobile integral type installation Battery case |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110899953A (en) * | 2019-11-12 | 2020-03-24 | 广东省焊接技术研究所(广东省中乌研究院) | Friction stir welding process for thin-wall battery tray |
CN110899953B (en) * | 2019-11-12 | 2021-08-03 | 广东省焊接技术研究所(广东省中乌研究院) | Friction stir welding process for thin-wall battery tray |
EP4089819A1 (en) * | 2021-05-11 | 2022-11-16 | CALB Co., Ltd. | Battery pack case, battery pack including the same and vehicle including battery pack |
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