CN109920949B - Lightweight power battery box - Google Patents
Lightweight power battery box Download PDFInfo
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- CN109920949B CN109920949B CN201910120394.7A CN201910120394A CN109920949B CN 109920949 B CN109920949 B CN 109920949B CN 201910120394 A CN201910120394 A CN 201910120394A CN 109920949 B CN109920949 B CN 109920949B
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- power battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
本发明公开了一种轻量化动力电池箱体，包括非金属上盖（1）和电池下箱体（2），非金属上盖通过固定件罩盖在电池下箱体上，构成动力电池箱体，电池模组（3）固定在动力电池箱体内；电池下箱体包括非金属底座（21）、内部铝框架（22）和外部铝框架（23），非金属底座设置在外部铝框架上，并通过固定件固定，内部铝框架设置在非金属底座内，并通过固定件固定；电池模组通过内部铝框架固定在非金属底座内；非金属上盖和非金属底座为非金属材料制成。本发明能有效减轻电池箱体的重量，并且满足箱体的机械安全要求，解决箱体通过螺栓连接的气密性难题，攻克箱体电磁屏蔽性能难以保证的难题。
The invention discloses a lightweight power battery box, comprising a non-metal upper cover (1) and a battery lower box (2). The non-metal upper cover is covered on the battery lower box through a fixing member to form a power battery box The battery module (3) is fixed in the power battery box; the battery lower box includes a non-metallic base (21), an inner aluminum frame (22) and an outer aluminum frame (23), and the non-metallic base is arranged on the outer aluminum frame. , and fixed by the fixing parts, the internal aluminum frame is set in the non-metallic base and fixed by the fixing parts; the battery module is fixed in the non-metallic base through the internal aluminum frame; the non-metallic upper cover and the non-metallic base are made of non-metallic materials to make. The invention can effectively reduce the weight of the battery box, meet the mechanical safety requirements of the box, solve the problem of air tightness of the box connected by bolts, and overcome the difficult problem of ensuring the electromagnetic shielding performance of the box.
Description
Technical Field
The invention relates to the field of power batteries of electric automobiles, in particular to a light-weight power battery box body.
Background
With the increasing severity of energy problems, lightweight design has important significance in the field of electric automobiles. The automobile lightweight technology mainly comprises two aspects: firstly, the development and application of novel materials, secondly lightweight structural design. The power battery box body is a bearing structural member of a new energy automobile battery, the weight of the power battery box body accounts for about 10% of the weight of the whole battery pack, and the light weight of the power battery box body has important significance for improving the energy density of the whole battery pack. The traditional power battery box body is mostly made of metal materials such as steel and aluminum, and has the disadvantages of heavy weight, high cost and poor corrosion resistance. At present, some battery cases begin to adopt lightweight materials such as high-strength steel, magnesium aluminum alloy and the like, but the cost is high and the corrosion resistance is poor.
The glass fiber composite material (SMC) is used as a non-metal material with low cost, good mechanical property, wide use temperature range and good chemical corrosion resistance, and has been applied to the upper cover of the battery box body, and the covering piece for protecting and sealing the whole battery can be replaced by the non-metal material from the traditional metal material to realize the light weight of the battery box body. However, for application to load-bearing structural members of the box, SMC must be combined with metallic materials to form a composite structure to meet the strength requirements of the box. At present, effective connection cannot be achieved between the light-weight composite structures, the mechanical safety requirements of the box body can be met, and the connection mode of box body air tightness and water immersion tests is difficult to achieve. In addition, the electromagnetic shielding performance of the battery box body made of the non-metal SMC material in the prior art cannot be effectively ensured.
Disclosure of Invention
The invention aims to provide a light-weight power battery box body, which can effectively reduce the weight of the battery box body, meet the mechanical safety requirement of the box body, solve the problem of air tightness of the box body through bolt connection and overcome the problem that the electromagnetic shielding performance of the box body is difficult to guarantee.
The invention is realized by the following steps:
a lightweight power battery box body comprises a non-metal upper cover and a battery lower box body, wherein the non-metal upper cover covers the battery lower box body through a fixing piece to form the power battery box body, and a battery module is fixed in the power battery box body;
the lower box body of the battery comprises a non-metal base, an internal aluminum frame and an external aluminum frame, wherein the non-metal base is arranged on the external aluminum frame and is fixed by a fixing piece, and the internal aluminum frame is arranged in the non-metal base and is fixed by the fixing piece; the battery module is fixed in the non-metal base through the internal aluminum frame; the non-metal upper cover and the non-metal base are made of non-metal materials.
The non-metallic material is an SMC material, a carbon fiber reinforced composite material, a carbon-glass mixed composite material or a basalt fiber reinforced composite material.
The outside aluminum frame include bottom aluminum frame and weld the side lug in bottom aluminum frame both sides, the edge of non-metallic base is equipped with the turn-ups, sets up the mounting on non-metallic base's turn-ups, makes non-metallic base pass through the turn-ups and fix on the side lug through the mounting.
The side lug on be equipped with automobile body installation through-hole, the power battery box passes through the mounting and installs on automobile body through automobile body installation through-hole.
All the fixing pieces used in the power battery box body are provided with sealant on the flange surfaces.
And the external aluminum frame and the non-metal base are provided with screw connection counter bores, and the screw connection counter bores are provided with sealing rings.
The nonmetal base on be equipped with the through-hole of assembly connector, the lateral wall of through-hole bonds the aluminum plate that has blind hole nut, aluminum plate structure ground.
The power battery box body also comprises a sealing ring which is arranged between the nonmetal upper cover and the nonmetal base.
And the non-metal upper cover and the non-metal base are provided with aluminum foil layers.
The mounting hole of inside aluminum frame in inlayed and to have the steel ring, have the tapping in the steel ring.
The invention effectively reduces the weight of the battery box body and meets the mechanical safety requirement of the box body through the application of the non-metallic material SMC and the design of the composite structure of the box body, and solves the air tightness problem of the box body through bolt connection through a plurality of verifications such as seawater soaking, damp-heat circulation, salt spray test, flame resistance, temperature impact, mechanical vibration, extrusion test and the like, and through the verification of the air tightness and water soaking test of the box body by adding a sealing method such as a viscous sealing ring, a viscous bolt, a pre-embedded nut and the like; in addition, aluminum foil is added to the SMC material of the box body wholly or partially, and grounding is built, so that the problem that the electromagnetic shielding performance of the box body made of non-metal materials in the industry is difficult to guarantee is solved. The invention has simple structure and lower cost, and can reduce the cost of the die, shorten the project development period and improve the project development efficiency.
Drawings
FIG. 1 is an exploded view of a lightweight power battery case of the present invention;
FIG. 2 is a schematic structural diagram of a non-metallic base of the lightweight power battery case of the present invention;
fig. 3 is a schematic structural view of an internal aluminum frame of the lightweight power battery case of the present invention.
In the figure, 1 nonmetal upper cover, 2 battery lower box, 21 nonmetal base, 210 flanging, 211 through-hole, 212 aluminum plate, 22 inside aluminum frame, 221 steel ring, 222 mounting hole, 23 outside aluminum frame, 231 bottom aluminum frame, 232 side lug, 233 automobile body mounting through-hole, 24 sealing rings, 3 battery modules, 4 sealing rings.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached drawing 1, the lightweight power battery box comprises a non-metal upper cover 1 and a battery lower box body 2, wherein the non-metal upper cover 1 covers the battery lower box body 2 through fixing parts such as bolts and the like to form the power battery box body, and a battery module 3 is fixed in the power battery box body. The battery lower box body 2 comprises a non-metal base 21, an internal aluminum frame 22 and an external aluminum frame 23, wherein the non-metal base 21 is arranged on the external aluminum frame 23 and is fixed through a fixing piece, and the internal aluminum frame 22 is arranged in the non-metal base 21 and is fixed through a fixing piece; the battery module 3 is fixed in the non-metal base 21 through an internal aluminum frame 22; nonmetal upper cover 1 and nonmetal base 21 are made for non-metallic material, ensure the lightweight of power battery box. Preferably, the non-metal top cover 1 and the non-metal base 21 can be made of SMC material, carbon fiber reinforced composite material, carbon-glass mixed composite material, basalt fiber reinforced composite material, or the like.
Preferably, the non-metal base 21, the internal aluminum frame 22 and the external aluminum frame 23 can be connected into a whole by external bolts, and can also be directly bonded into a whole by structural adhesive, and the box can pass box environment test and mechanical safety test verification: the method comprises the steps of seawater soaking, damp-heat circulation, salt spray test, flame retardance, temperature impact, mechanical vibration, extrusion test, air tightness and water immersion test, electromagnetic shielding and the like.
Outside aluminum frame 23 include bottom aluminum frame 231 and weld the side lug 232 in bottom aluminum frame 231 both sides, the edge of non-metallic base 21 is equipped with turn-ups 210, fixedly set up mounting such as rivet nut on turn-ups 210 of non-metallic base 21, make non-metallic base 21 pass through turn-ups 210 and fix on side lug 232 through mounting such as rivet nut. The method for fixedly arranging the rivet nut on the flanging 210 of the non-metal base 21 comprises one or more methods of adhering the nut on the bottom of the flanging 210 by using structural adhesive, pre-embedding the nut on the flanging 210, adopting a step rivet nut and the like.
Preferably, the processing method of the external aluminum frame 23 can adopt the processes of machining, aluminum casting, extrusion forming and the like, the non-metal base 21 can adopt compression molding, the mold cost of the composite box body is less than about one million yuan, and the development period is about 45 days, while the mold cost of the traditional stamping plate is at least several million, and the development period is 60-75 days.
The side lug 232 on be equipped with automobile body installation through-hole 233, the power battery box passes through mounting such as bolt and installs on automobile body through automobile body installation through-hole 233, the dismouting of the power battery box of being convenient for.
The outer aluminum frame 23 and the non-metal base 21 are provided with screw connection counter bores, and the screw connection counter bores are provided with sealing rings 24, so that the outer aluminum frame 23 and the non-metal base 21 can be in screw connection in a sealing mode, the air tightness of the bottom of the power battery box body can be enhanced, and preferably, the sealing rings 24 can be single-sided or double-sided viscous sealing foam.
Referring to fig. 2, the non-metal base 21 is provided with a through hole 211 for assembling a connector, which can be used for assembling a high-pressure connector, a low-pressure connector, an explosion-proof valve, etc. Preferably, the side wall of the through hole 211 can be bonded with an aluminum plate 212 with a blind nut, so that the air tightness of the assembly of the connector is effectively ensured, the aluminum plate 212 can be grounded by bonding, and the local electromagnetic shielding performance of the high-voltage connector is effectively ensured.
All the fixing parts used in the power battery box body are provided with sealant on the flange surface, comprise bolts, external bolts, rivet nuts and the like, and the air tightness of the power battery box body can be further ensured.
The power battery box body also comprises a sealing ring 4, the sealing ring 4 is arranged between the nonmetal upper cover 1 and the nonmetal base 21, and the bolt penetrates through the nonmetal upper cover 1, the sealing ring 4 and the nonmetal base 21 to fix the nonmetal upper cover 1, the sealing ring 4 and the nonmetal base 21, so that better tightness is achieved between the nonmetal upper cover 1 and the battery lower box body 2.
The nonmetal upper cover 1 and the nonmetal base 21 are provided with aluminum foil layers, so that the whole electromagnetic shielding performance of the box body is effectively guaranteed, and preferably, the aluminum foil layers are coated on the inner surface of the SMC.
Referring to fig. 3, a steel ring 221 is embedded in the mounting hole 222 of the internal aluminum frame 22, and the steel ring 221 is a sleeve nut with internal tapping threads and can be used for connecting the external aluminum frame 23, the non-metal base 21 and the internal aluminum frame 22.
The invention adopts the design of SMC non-metallic material and box composite structure, the internal aluminum frame 22 is used for fixing the battery module 3 and other parts, the external aluminum frame 23 is used for fixing the whole power battery box, through multi-wheel structural optimization, simulation analysis and topology optimization, on the premise of meeting the mechanical safety requirement of the box, the weight of the power battery box is greatly reduced, the total weight of the box is 24.8kg, compared with the aluminum profile box 26.6kg with the same size, the weight is reduced by about 6%, compared with the cast aluminum box 28.8kg with the same size, the weight is reduced by about 13%, and the invention has larger weight advantage and is beneficial to increasing the endurance mileage of the electric automobile. Meanwhile, the cost of a single box body is about 1200 yuan due to the adoption of SMC materials with lower cost, the cost of the single box body is equivalent to that of a single box body made of cast aluminum, and the cost of the single box body is reduced by about 7% compared with that of a single box body made of 1300 yuan aluminum profiles, so that the box body has higher cost advantage.
The invention also realizes the effective sealing of the whole power battery box body by arranging the non-deformable viscous sealing ring 24 between the external aluminum frame 23 and the non-metal base 21 and adopting the sealing method of bolts, rivet nuts and the like with sealing glue on the flange surface, and can be verified by multiple items of tests such as seawater soaking, wet heat circulation, salt spray test, flame retardance, temperature impact, mechanical vibration, extrusion test, air tightness and water soaking test, electromagnetic shielding and the like. According to the invention, the aluminum plate 212 with the blind nut is bonded on the side wall of the through hole 211 for installing the connector on the non-metal base 21, so that the assembly air tightness of the connector is effectively ensured, and the aluminum plate is grounded by bonding, so that the local electromagnetic shielding performance of the high-voltage connector is effectively ensured.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910120394.7A CN109920949B (en) | 2019-02-18 | 2019-02-18 | Lightweight power battery box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910120394.7A CN109920949B (en) | 2019-02-18 | 2019-02-18 | Lightweight power battery box |
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| CN109920949A CN109920949A (en) | 2019-06-21 |
| CN109920949B true CN109920949B (en) | 2021-10-22 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210467906U (en) * | 2019-07-03 | 2020-05-05 | 江苏时代新能源科技有限公司 | Battery lower box body and battery system |
| CN110571384B (en) * | 2019-09-20 | 2022-05-27 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Lightweight tray for battery pack |
| CN110518171A (en) * | 2019-09-30 | 2019-11-29 | 江西优特汽车技术有限公司 | A kind of lightweight aluminium body structure |
| CN111439106A (en) * | 2020-05-08 | 2020-07-24 | 上海瓴荣材料科技有限公司 | A battery box combining metal and composite materials |
| CN114497853A (en) * | 2020-11-10 | 2022-05-13 | 一汽-大众汽车有限公司 | Battery case mounting structure of electric automobile |
| CN112803104B (en) * | 2021-01-13 | 2022-09-27 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Pressure-resistant high-volume-ratio energy battery pack and welding method thereof |
| CN114759307B (en) * | 2022-03-11 | 2023-07-25 | 上海汽车集团股份有限公司 | A battery pack and box assembly thereof |
| CN115663343A (en) * | 2022-11-04 | 2023-01-31 | 江苏亿都智能特种装备有限公司 | Liquid-cooled new energy box and forming method of box body in same |
| CN119324289B (en) * | 2024-12-19 | 2025-03-25 | 河北华曙新能源汽车科技有限公司 | A lightweight power battery box with strong airtightness |
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| CN109920949A (en) | 2019-06-21 |
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