A power battery box with steel roll-pressed structure

Abstract

The utility model provides a power battery box with a steel roll-pressed structure, comprising a box, a liquid cooling plate and a bottom guard plate, wherein the box is provided with a laser cutting hole, the liquid cooling plate is arranged between the box and the bottom guard plate, the liquid cooling plate is sealed and connected to the box through a sealant, and the bottom guard plate is sealed and connected to the box through a silicone sealing ring. The power battery box with a steel roll-pressed structure of the utility model can simultaneously meet the requirements of cost reduction and maintaining product performance of the same level, and solves the difficult balancing problem of the industry's requirements of lightweight box design, development cost, unit price cost, platform design, etc.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a power battery box with a steel roll-pressed structure. Background Art

[0002] The existing power battery box is mainly produced through three processing methods: steel stamping welding, extruded aluminum welding, and aluminum alloy casting. Among them, the steel stamping box has poor lightweight, high mold development costs, and no product platform feasibility; the extruded aluminum box has good lightweight effect, low mold development costs, and has certain platform feasibility, but the cost of aluminum materials is much higher than that of steel, and the unit price of the finished product is high; aluminum alloy casting has good lightweight effect, but the mold development cost is very high, and there is no product platform feasibility. Utility Model Content

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the utility model provides a power battery case with a steel roll-formed structure, which can simultaneously meet the needs of cost reduction and maintaining the same level of product performance, and solves the difficult balancing problem of lightweight case design, development cost, unit price cost, platform design and other demands in the industry.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a power battery box body with a steel roll-pressed structure, comprising a box body, a liquid cooling plate and a bottom guard plate, wherein the liquid cooling plate is arranged between the box body and the bottom guard plate, the liquid cooling plate is sealed and connected to the box body through a sealant, and the bottom guard plate is sealed and connected to the box body through a silicone sealing ring.

[0005] Furthermore, the box body is provided with a laser cutting hole, and the silicone sealing ring is silicone foam.

[0006] Furthermore, the box body is composed of two oppositely arranged outer side beams and two oppositely arranged front side beams, the front side beam is located between the two outer side beams, and the interior of the box body includes an internal cross beam and an internal longitudinal beam.

[0007] Furthermore, the box body is connected to the outer side beam, the front side beam, the inner cross beam, and the inner longitudinal beam by arc welding to form an inner sealing structure.

[0008] Furthermore, the outer edge beam includes a first bent C-beam, a second bent C-beam and a reinforcing plate, the end where the second bent C-beam is connected to the first bent C-beam and the end where the reinforcing plate is connected to the first bent C-beam are first laser weld ends, and the end where the reinforcing plate and the second bent C-beam are plug weld ends.

[0009] Furthermore, the width of the outer beam is 22 mm, the width of the first bent C-beam is 22 mm, and the width of the reinforcing plate is 8-12 mm.

[0010] Furthermore, the sealing between the box body and the liquid cooling plate is composed of the first bent C-beam, the sealant, the double-step M5 rivet nut and the liquid cooling plate, and the first bent C-beam has a glue storage groove that cooperates with the sealant.

[0011] Furthermore, the seal between the bottom guard plate and the liquid cooling plate is composed of the liquid cooling plate, the silicone sealing ring, the bolts and the bottom guard plate.

[0012] Furthermore, the middle cross beam of the box body is composed of a first steel rolled S-shaped beam and an aluminum extruded beam, the top of the first steel rolled S-shaped beam is provided with a through hole, an M5 bolt is provided in the through hole, an M5 rivet nut is provided at the bottom of the M5 bolt, and the interior of the aluminum extruded beam has a second laser weld end.

[0013] Furthermore, the middle longitudinal beam of the box body includes a second steel rolled S-shaped beam, and the second steel rolled S-shaped beam has a third laser weld end inside.

[0014] In summary, the beneficial effects of the utility model are:

[0015] The power battery box body of the utility model has a steel roll-formed structure, which reduces the unit cost of the power battery box body, solves the technical problems such as the one-time investment in the mold cost of the outer side beam of the steel roll-formed box body is too large, the assembly precision requirement is high when the liquid cooling plate is integrated into the steel roll-formed box body, the installation hole alignment is difficult, the airtightness is difficult to ensure, the load-bearing capacity is poor, the outer side beam width of the steel roll-formed box body is large, and the mechanical properties of the steel roll-formed box body are not lower than those of the aluminum profile box body.

[0016] The power battery box body of the utility model has a steel roll-formed structure, which mainly adopts the roll-formed and welding technology of the automobile industry, rolls out a single frame similar to an aluminum profile and then welds it, and then integrates a liquid cooling plate and a bottom guard plate on the bottom of the box body. Compared with the extruded aluminum profile welding box, the unit price is reduced by about 20%~30%; compared with the conventional roll-pressed Japanese-shaped outer side beam, the utility model adopts 2 C-shaped bent side beams and internal bent reinforcement plates for welding, which can reduce the cost of rolling molds by 100%; compared with the conventional "M5 blind rivets" connecting the cold plate and the box side beam, the assembly is difficult (blind rivets generally require the liquid plate opening size to be 0.1mm larger, the accuracy is 0~+0.1mm, and the load-bearing force is ≥4000N), the utility model adopts "M5 double-step-full hexagonal blind hole waterproof rivet nut", the upper and lower opening sizes of the liquid cold plate are 10mm and 12mm respectively, the accuracy is 0~+0.2mm, the load-bearing force is ≥11500N, the installation through hole and tolerance accuracy are greater, The difficulty of assembly process is greatly reduced, the load-bearing capacity is increased by 2~3 times, and air tightness is easier to ensure; compared with the conventional design scheme of 25mm~32mm width of rolled side beam, the minimum width of the rolled side beam of the utility model is only 22mm, which increases the internal space of the battery box; compared with 6 series or 7 series aluminum of aluminum profiles, rolled steel profiles such as DP780, DP980, DP1180, MS1500 are used, the tensile strength and yield strength of the material are increased several times, the wall thickness range is 1.0mm~1.5mm, and the comprehensive mechanical properties are not lower than the aluminum profile box; the internal horizontal and longitudinal beams of the utility model adopt a screw-connected combination of low-height Japanese-shaped steel rolled profiles + aluminum alloy profiles, and the external side beams adopt two C-shaped bent side beams welded together. When the Z-direction height dimension of the box needs to be expanded, the Z-direction changes and adjustments can be made at a low cost by adjusting the external C-shaped side beam bending fixture and the internal aluminum alloy mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the power battery box of the steel roll-pressed structure of the utility model;

[0018] Figure 2 for Figure 1 A side view of a power battery box of a steel roll-formed structure shown;

[0019] Figure 3 for Figure 2 A schematic diagram of the structure of a steel roll-formed profile of a power battery box of a steel roll-formed structure shown;

[0020] Figure 4 for Figure 2 A schematic diagram of the double-layer sealing structure of a power battery box of a steel roll-pressed structure shown in FIG.

[0021] Figure 5 for Figure 2A schematic diagram of the structure of the middle cross beam of the power battery box of the steel roll-pressed structure shown;

[0022] Figure 6 for Figure 2 The schematic diagram of the structure of the middle longitudinal beam of the power battery box with a steel roll-formed structure is shown.

[0023] Legend

[0024] Box body 1, liquid cooling plate 2, bottom guard plate 3, outer side beam 10, inner cross beam 20, inner longitudinal beam 30, first bent C-beam 101, reinforcement plate 102, second bent C-beam 103, first laser weld end 104, plug weld end 105, sealant 106, double-step M5 rivet nut 107, first steel rolled Japanese-shaped beam 109, aluminum extruded beam 110, M5 rivet nut 111, M5 bolt 112, second laser weld end 113, second steel rolled Japanese-shaped beam 114, third laser weld end 115, silicone seal 201, bolt 202, front side beam 11, laser cut hole 12. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figures 1 to 6 The utility model discloses a power battery box with a steel roll-pressed structure, comprising a box 1, a liquid cooling plate 2 and a bottom guard plate 3, wherein the liquid cooling plate is arranged between the box and the bottom guard plate, the liquid cooling plate is sealed and connected to the box through a sealant 106, and the bottom guard plate is sealed and connected to the box through a silicone sealing ring 201.

[0027] Specifically, the bottom of the box body has two sealing structures. The liquid cooling plate and the box body use sealant as the first seal, and the bottom guard plate and the box body use silicone foam as the second seal. That is, after the bottom guard plate is broken, the liquid cooling plate and the box body can still play a sealing role.

[0028] In one embodiment, the box body is provided with a laser cutting hole 12, and the silicone sealing ring is silicone foam.

[0029] In one embodiment, the box body is composed of two oppositely disposed outer side beams 10 and two oppositely disposed front side beams 11 , wherein the front side beam is located between the two outer side beams, and the interior of the box body includes an internal cross beam 20 and an internal longitudinal beam 30 .

[0030] In one embodiment, the box body is connected to the outer side beam, the front side beam, the inner cross beam, and the inner longitudinal beam by arc welding to form an inner sealing structure.

[0031] In one embodiment, the outer edge beam includes a first bent C-beam 101, a second bent C-beam 103 and a reinforcing plate 102, the end where the second bent C-beam is connected to the first bent C-beam and the end where the reinforcing plate is connected to the first bent C-beam are first laser weld ends 104, and the end where the reinforcing plate and the second bent C-beam are plug weld ends 105.

[0032] In one embodiment, the width of the outer beam is 22 mm, the width of the first bent C-beam is 22 mm, and the width of the reinforcing plate is 8-12 mm.

[0033] In one embodiment, the sealing of the box and the liquid cooling plate is composed of the first bent C-beam, the sealant, the double-step M5 rivet nut and the liquid cooling plate, and the first bent C-beam has a sealant storage groove for matching with the sealant. Specifically, the sealant has a thickness of 1.5-2.0 mm and a width of ≥7 mm.

[0034] In one embodiment, the seal between the bottom guard plate and the liquid cooling plate is composed of the liquid cooling plate, the silicone sealing ring, the bolt 202 and the bottom guard plate. Specifically, the bottom guard plate can be made of steel, aluminum alloy, composite material, and has a thickness of ≥0.8 mm.

[0035] In one embodiment, the middle cross beam of the box body is composed of a first steel rolled Japanese-shaped beam 109 and an aluminum extruded beam 110. A through hole is provided at the top of the first steel rolled Japanese-shaped beam, an M5 bolt 112 is provided in the through hole, an M5 rivet nut 111 is provided at the bottom of the M5 bolt, and a second laser weld end 113 is provided inside the aluminum extruded beam. With different total height requirements, the steel rolled Japanese-shaped beam mold does not need to be changed, and the height adjustment cost of the aluminum extruded beam is low.

[0036] In one embodiment, the box body middle longitudinal beam comprises a second steel rolled S-shaped beam 114 , and the second steel rolled S-shaped beam has a third laser weld end 115 inside.

[0037] The power battery box of the steel roll-pressed structure of the utility model, the liquid cooling plate is connected to the box through the "M5 double step-full hexagonal blind hole waterproof rivet nut", and the bottom guard plate is fixed to the box using M5 bolts through the mounting holes provided by the "M5 double step-full hexagonal blind hole waterproof rivet nut". The entire outer side beam of the box is similar to the front side beam 11, and is designed with laser cutting holes 12. The number of holes corresponds to the number of rivet nuts. The length of the opening is 22~25mm and the width is 12~15mm to avoid the rivet nuts and achieve the purpose of a narrow frame of 22mm.

[0038] The power battery box body of the utility model has a steel roll-formed structure, which reduces the unit cost of the power battery box body, solves the technical problems such as the one-time investment in the mold cost of the outer side beam of the steel roll-formed box body is too large, the assembly precision requirement is high when the liquid cooling plate is integrated into the steel roll-formed box body, the installation hole alignment is difficult, the airtightness is difficult to ensure, the load-bearing capacity is poor, the outer side beam width of the steel roll-formed box body is large, and the mechanical properties of the steel roll-formed box body are not lower than those of the aluminum profile box body.

[0039] The power battery box body of the utility model has a steel roll-formed structure, which mainly adopts the roll-formed and welding technology of the automobile industry, rolls out a single frame similar to an aluminum profile and then welds it, and then integrates a liquid cooling plate and a bottom guard plate on the bottom of the box body. Compared with the extruded aluminum profile welding box, the unit price is reduced by about 30%; compared with the conventional roll-pressed Japanese-shaped outer side beam, the utility model adopts 2 C-shaped bent side beams and internal bent reinforcement plates for welding, which can reduce the cost of roll-pressing molds by 100%; compared with the conventional "M5 blind rivets" connecting the cold plate and the box side beam, the assembly is difficult (blind rivets generally require the liquid plate opening size to be 0.1mm larger, the accuracy is 0~+0.1mm, and the load-bearing force is ≥4000N), the utility model adopts "M5 double-step-full hexagonal blind hole waterproof rivet nut", the upper and lower opening sizes of the liquid cold plate are 10.5mm, the accuracy is 0~+0.5mm, the opening size of the hexagonal hole on the roll-pressed steel beam is 7.0mm, the accuracy is 0~+0.1mm, the load-bearing force is ≥11500N, and the installation is simple. The precision of through-hole and tolerance is greater, which greatly reduces the difficulty of assembly process, increases the load-bearing capacity by 2~3 times, and makes it easier to ensure air tightness; compared with the conventional design scheme of 25mm~32mm width of rolled side beam, the minimum width of the rolled side beam of the utility model is only 22mm, which increases the internal space of the battery box; compared with 6 series or 7 series aluminum of aluminum profile, the rolled steel profile, such as DP780, DP980, DP1180, MS1500, is used, the tensile strength and yield strength of the material are increased several times, the wall thickness range is 1.0mm~1.5mm, and the comprehensive mechanical properties are not lower than the aluminum profile box; the internal horizontal and vertical beams of the utility model are screwed and combined with low-height Japanese-shaped steel rolled profiles + aluminum alloy profiles, and the external side beams are welded by two C-shaped bent side beams. When the Z-direction height dimension of the box needs to be expanded, the Z-direction changes can be made at a low cost by adjusting the external C-shaped side beam bending jig and the internal aluminum alloy mold.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power battery box with a steel roll-pressed structure, characterized in that: It includes a box body, a liquid cooling plate and a bottom guard plate. The box body is provided with a laser cutting hole. The liquid cooling plate is arranged between the box body and the bottom guard plate. The liquid cooling plate is sealed to the box body through a sealant. The bottom guard plate is sealed to the box body through a silicone sealing ring.

2. A power battery box with a steel roll-pressed structure according to claim 1, characterized in that: The silicone sealing ring is silicone foam.

3. A power battery box with a steel roll-pressed structure according to claim 2, characterized in that: The box body is composed of two oppositely arranged outer side beams and two oppositely arranged front side beams, wherein the front side beam is located between the two outer side beams, and the interior of the box body includes an internal cross beam and an internal longitudinal beam.

4. A power battery box with a steel roll-pressed structure according to claim 3, characterized in that: The box body is connected to the outer side beam, the front side beam, the inner cross beam and the inner longitudinal beam by arc welding to form an inner sealing structure.

5. A power battery box with a steel roll-pressed structure according to claim 4, characterized in that: The outer edge beam includes a first bent C-beam, a second bent C-beam and a reinforcing plate, the end where the second bent C-beam is connected to the first bent C-beam and the end where the reinforcing plate is connected to the first bent C-beam are first laser weld ends, and the end where the reinforcing plate and the second bent C-beam are plug weld ends.

6. A power battery box with a steel roll-pressed structure according to claim 5, characterized in that: The width of the outer beam is 22 mm, the width of the first bent C-beam is 22 mm, and the width of the reinforcing plate is 8-12 mm.

7. A power battery box with a steel roll-pressed structure according to claim 6, characterized in that: The sealing between the box body and the liquid cooling plate is composed of the first bent C-beam, the sealant, a double-step M5 rivet nut and the liquid cooling plate, and the first bent C-beam has a glue storage groove that cooperates with the sealant.

8. The power battery box of the steel roll-pressed structure according to claim 7, characterized in that: The sealing between the bottom guard plate and the liquid cooling plate is composed of the liquid cooling plate, the silicone sealing ring, bolts and the bottom guard plate.

9. The power battery box of the steel roll-pressed structure according to claim 8, characterized in that: The middle cross beam of the box body is composed of a first steel rolled S-shaped beam and an aluminum extruded beam. A through hole is opened on the top of the first steel rolled S-shaped beam, an M5 bolt is arranged in the through hole, an M5 rivet nut is arranged at the bottom of the M5 bolt, and a second laser weld end is arranged inside the aluminum extruded beam.

10. A power battery box with a steel roll-pressed structure according to claim 9, characterized in that: The middle longitudinal beam of the box body comprises a second steel rolled S-shaped beam, and the second steel rolled S-shaped beam has a third laser weld end inside.

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