Box body structure for energy storage battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a box body structure for an energy storage battery pack, which comprises a water cooling plate, an upper module fixing beam and a lower box body frame, the upper module fixing beam is arranged on the upper surface of the water cooling plate, and the lower box body frame is arranged on the lower surface of the water cooling plate. By optimizing the mounting position and the structural form of the lower box body frame and removing the design of a bottom protective plate, poor air tightness caused by poor welding, uneven gluing, insufficient riveting strength and other main reasons is thoroughly eliminated, the first-pass yield of the air tightness of the lower box body is improved, and meanwhile under the condition that it is guaranteed that the structural strength of the whole lower box body reaches the standard, the air tightness of the lower box body is improved. The manufacturing cost is reduced. The overall structural strength of the box body can be guaranteed, the air tightness of the lower box body can be guaranteed, and therefore it is guaranteed that the protection grade of the box body meets the technical requirement of IP67. Therefore, the utility model can solve the technical problem that the protection grade is not up to the standard due to the airtight leakage of the whole battery pack caused by the unqualified airtight of the existing lower box body.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a box body structure for an energy storage battery pack. Background Art

[0002] At present, the protection level requirement for the energy storage battery pack of new energy vehicles is above IP67. Among them, IP represents Ingress Protection Rating, that is, the protection level, which is used to evaluate the protection ability of the device against the intrusion of solid particles and liquids. Specifically, the "6" in IP67 indicates that the dust-proof ability has reached the highest level, meaning that it can completely prevent dust from invading; the "7" indicates that it can resist the intrusion of water for a short time, usually referring to continuous immersion at a depth of 1 meter underwater for half an hour. The battery pack with IP67 level can ensure the safety and reliability of the battery pack in complex usage environments, such as in waterlogged sections or when wading.

[0003] The conventional method for an energy storage battery pack is to assemble and combine an upper box cover, a lower box body, a front panel, a sealing ring, and connectors to form a sealed space. Since the lower box body is composed of a water-cooled plate, a box body frame, a bottom protection plate, and fasteners, as Figure 1 shown, the structural design is complex, and the processing technology includes stamping, brazing, rolling, bending, welding, grinding, electrophoresis, riveting, gluing, etc. If any one of the processing technologies is not handled well, it will cause the airtightness of the lower box body to be unqualified. Especially when the box body frame is installed on the upper part of the water-cooled plate, if the welding is poor, the gluing is uneven, and the riveting strength is insufficient, etc., it will cause the airtightness of the lower box body to be unqualified, resulting in airtight leakage of the overall battery pack and the protection level not meeting the standard. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a box body structure for an energy storage battery pack, which can solve the technical problem that the existing lower box body causes airtight leakage of the overall battery pack due to unqualified airtightness, resulting in the protection level not meeting the standard.

[0005] To achieve the above purpose, a box body structure for an energy storage battery pack designed by the utility model includes a water-cooled plate, an upper module fixing beam, and a lower box body frame. The upper module fixing beam is arranged on the upper surface of the water-cooled plate, and the lower box body frame is arranged on the lower surface of the water-cooled plate; the lower box body frame is a frame structure with a hollow interior surrounded by a front frame, a rear frame, a left frame, and a right frame, and the size of the water-cooled plate matches the internal size of the frame structure.

[0006] As a preferred solution, the lower box body frame further includes a narrow cross beam, the narrow cross beam is arranged along the width direction of the water-cooled plate, and both ends of the narrow cross beam are respectively connected to the left frame and the right frame.

[0007] Further, there are several narrow crossbeams, and the several narrow crossbeams are evenly arranged at the bottom of the water-cooling plate.

[0008] Further, the lower box body frame further includes a front wide crossbeam and a rear wide crossbeam parallel to the narrow crossbeams. The front wide crossbeam is arranged in the first half of the bottom of the water-cooling plate, and the rear wide crossbeam is arranged in the second half of the bottom of the water-cooling plate.

[0009] Further, liquid leakage holes are designed on the narrow crossbeams, the rear wide crossbeam and the front wide crossbeam.

[0010] Further, the lower box body frame further includes short support blocks and long support blocks arranged along the length direction of the water-cooling plate. The short support blocks and the long support blocks are installed at intervals on the upper ends of the narrow crossbeams.

[0011] As a preferred solution, the upper module fixing beam includes a front module beam, a middle module beam and a rear module beam arranged along the width direction of the water-cooling plate. The front module beam and the rear module beam are respectively arranged on the front and rear sides of the top of the water-cooling plate, and the middle module beam is arranged in the middle of the top of the water-cooling plate.

[0012] As a preferred solution, the box body structure for the energy storage battery pack further includes a sealing ring, and the sealing ring is pasted around the water-cooling plate through bottom surface back glue.

[0013] Advantages of the present utility model:

[0014] The box body structure for the energy storage battery pack provided by the present utility model, by optimizing the installation position and structural form of the lower box body frame, removing the design of the bottom guard plate, completely eliminating the airtightness defects caused by the main reasons such as poor welding, uneven glue coating and insufficient riveting strength, improving the first-pass rate of the airtightness of the lower box body, and reducing the manufacturing cost while ensuring that the structural strength of the overall lower box body meets the standard. Through the optimized design of the lower box body frame structure, it can not only ensure the structural strength of the whole box body, but also ensure the airtightness of the lower box body, so as to ensure that the protection level of the box body meets the technical requirements of IP67.

[0015] Therefore, the present utility model can solve the technical problem that the existing lower box body causes airtight leakage of the overall battery pack due to unqualified airtightness, resulting in non-compliance of the protection level. Description of the drawings

[0016] Figure 1 It is a three-dimensional schematic diagram of a traditional box body structure.

[0017] Figure 2 It is a three-dimensional schematic diagram of the box body structure of the present utility model.

[0018] Figure 3 It is an exploded schematic diagram of the box body structure of the present utility model.

[0019] Description of the reference numerals in the drawings:

[0020] 1 Sealing ring, 3 Water-cooled plate, 20 Upper module fixing beam, 21 Lower box frame, 22 Bottom guard plate, 23 Fastener;

[0021] 20 Upper module fixing beam: 2 Rear module beam, 13 Front module beam, 14 Intermediate module beam,

[0022] 21 Lower box frame: 5 Rear border, 6 Right border, 10 Front border, 11 Left border, 7 Rear wide cross beam, 8 Narrow cross beam, 9 Front wide cross beam, 4 Short support block, 12 Long support block. Detailed implementation mode

[0023] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation modes. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all of them.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] Such as Figure 1As shown in the figure, a traditional box structure generally consists of a water-cooled plate, a box frame, a bottom guard plate, and fasteners, etc. The structural design is complex, and the processing technology includes stamping, brazing, rolling, bending, welding, grinding, electrophoresis, riveting, gluing, etc. If any of the processing technologies is not properly handled, it will cause the airtightness of the lower box to be unqualified. Especially when the box frame is installed on the upper part of the water-cooled plate, poor welding, uneven gluing, insufficient riveting strength, etc. will all cause the airtightness of the lower box to be unqualified, resulting in airtight leakage of the overall battery pack and causing the protection level to fail to meet the standards.

[0027] In view of the above problems, the present utility model discloses a box structure for an energy storage battery pack. By optimizing the installation position and structural form of the lower box frame, removing the design of the bottom guard plate, thoroughly eliminating the airtightness problems caused by main reasons such as poor welding, uneven gluing, and insufficient riveting strength, improving the first-pass rate of the airtightness of the lower box, and at the same time reducing the manufacturing cost while ensuring that the structural strength of the overall lower box meets the standards. Through the optimized design of the lower box frame structure, it can not only ensure the structural strength of the overall box but also ensure the airtightness of the lower box, thus ensuring that the protection level of the box meets the technical requirements of IP67.

[0028] The technical solution adopted by the present utility model is as follows: A box structure for an energy storage battery pack includes: a water-cooled plate, a sealing ring, an upper module fixing beam, a lower box frame, and a support block. The lower box frame is welded by three parts: a left and right frame, a front and rear frame, and several cross beams. The upper module fixing beam includes a front module beam 13, a middle module beam 14, and a rear module beam 2. The upper module fixing beam is fixed on the upper side of the water-cooled plate with riveting screws. The sealing ring is pasted around the water-cooled plate. The upper surface of the lower box frame and the water-cooled plate are fixed with riveting screws. Several cross beams are evenly arranged at the bottom of the water-cooled plate to increase the structural strength of the lower box frame. Removing the design of the bottom guard plate reduces the weight of the lower box, and at the same time reduces the processing and assembly process and the manufacturing cost of the lower box.

[0029] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0030] As Figure 2 、 3 shown, the present utility model provides a box structure for an energy storage battery pack, including a sealing ring 1, a water-cooled plate 3, an upper module fixing beam 20, and a lower box frame 21. The upper module fixing beam 20 is arranged on the upper surface of the water-cooled plate 3, and the lower box frame 21 is arranged on the lower surface of the water-cooled plate 3. The sealing ring 1 is pasted around the water-cooled plate 3 through bottom surface back glue.

[0031] The lower box structure mainly consists of four parts: a sealing ring, an upper module fixing beam, a lower box frame, and a water-cooled plate. The sealing ring 1 is pasted around the water-cooled plate 3 through bottom surface back glue. The round holes evenly distributed on the upper surface of the sealing ring 1 are for installing bolts.

[0032] The lower box frame 21 includes a front frame 10, a rear frame 5, a left frame 11, a right frame 6, a narrow cross beam 8, a front wide cross beam 9 parallel to the narrow cross beam 8, a rear wide cross beam 7, a short support block 4 and a long support block 12 arranged along the length direction of the water cooling plate 3. The front frame 10, rear frame 5, left frame 11, and right frame 6 enclose a frame structure with a hollow interior, and the size of the water cooling plate 3 matches the internal size of the frame structure. The narrow cross beam 8 is arranged along the width direction of the water cooling plate 3, and both ends of the narrow cross beam 8 are respectively connected to the left frame 11 and the right frame 6. There are several narrow cross beams 8, and the several narrow cross beams 8 are evenly arranged at the bottom of the water cooling plate 3. The front wide cross beam 9 is arranged in the first half of the bottom of the water cooling plate 3, and the rear wide cross beam 7 is arranged in the second half of the bottom of the water cooling plate 3. Leakage holes are designed on the narrow cross beam 8, rear wide cross beam 7, and front wide cross beam 9. The short support block 4 and the long support block 12 are installed at intervals on the upper end of the narrow cross beam 8.

[0033] The front frame 10, left frame 11, right frame 6, rear frame 5, rear wide cross beam 7, narrow cross beam 8, and front wide cross beam 9 form the lower box frame. The lower box frame is installed on the lower surface of the water cooling plate and is fastened in the middle by rivet screws. The fixing holes around the lower box frame are exactly aligned with the round holes around the sealing ring 1 to ensure that the screws pass through the sealing ring 1 and are installed around the lower box frame. Several narrow cross beams 8 are evenly arranged in the middle of the lower box frame. At the same time, directly below the middle area between the front and rear two rows of modules, a rear wide cross beam 7 and a front wide cross beam 9 are respectively designed. The purpose is to increase the structural strength of the lower box frame; leakage holes are designed on the narrow cross beam 8, rear wide cross beam 7, and front wide cross beam 9 to ensure that the inside of the cross beam can be fully electrophoresed during electrophoresis; structural adhesive is added between the upper surfaces of the narrow cross beam 8, rear wide cross beam 7, and front wide cross beam 9 and the lower surface of the water cooling plate to increase the buffer between the two and avoid the situation where the water cooling plate is deformed and directly contacts the cross beam, resulting in damage to the flow channel. Since the flow channel spacing of the water cooling plate is not evenly distributed, short support blocks 4 and long support blocks 12 are added at the place where the flow channel spacing is the largest. Their materials are the same as those of the water cooling plate, both being Al3003. The short support blocks 4 and long support blocks 12 are fixed on the lower surface of the water cooling plate 3 by brazing. The narrow cross beam 8 is in direct contact with the short support blocks 4 and long support blocks 12, increasing the contact area between the water cooling plate 3 and the lower box frame and making the force on the water cooling plate 3 more uniform.

[0034] The upper module fixing beam 20 includes a front module beam 13, a middle module beam 14, and a rear module beam 2 arranged along the width direction of the water cooling plate 3. The front module beam 13 and the rear module beam 2 are respectively arranged on the front and rear sides of the top of the water cooling plate 3, and the middle module beam 14 is arranged in the middle of the top of the water cooling plate 3.

[0035] The front module beam 13, the middle module beam 14 and the rear module beam 2 form the upper module fixing beam. The front module beam 13, the middle module beam 14 and the rear module beam 2 are fixed to the upper surface of the water-cooling plate by riveting screws. The upper surface of the module beam is designed with openings for installing riveting screws. The front and rear two rows of modules are fixed to the upper surface of the module beam by riveting screws.

[0036] The lower box frame of the present utility model is transferred from being installed on the upper surface of the water-cooling plate to being installed on the lower surface of the water-cooling plate; the design and installation of the bottom guard plate are cancelled, which can eliminate adverse factors such as poor welding of the lower box frame, uneven gluing and insufficient riveting strength, and improve the qualified rate of the airtightness of the lower box. Through this design, as long as it is ensured that the airtightness of the water-cooling plate is qualified, the flatness of the water-cooling plate meets the design requirements, and the sealing ring is not damaged, it can be ensured that the overall airtightness of the lower box meets the standard. According to actual production experience and current technical means, the processing technology of the water-cooling plate has been very mature, and the qualified rate of the shipped products is 100%. Therefore, using this solution not only reduces the processing technology, but also reduces the production cost, and at the same time improves the qualified rate of the airtightness of the lower box.

[0037] The above embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A box structure for an energy storage battery pack, characterized in that: It includes a water-cooling plate (3), an upper module fixing beam (20), and a lower box frame (21). The upper module fixing beam (20) is arranged on the upper surface of the water-cooling plate (3), and the lower box frame (21) is arranged on the lower surface of the water-cooling plate (3). The lower box frame (21) is a frame structure with a hollow interior formed by enclosing a front frame (10), a rear frame (5), a left frame (11), and a right frame (6). The size of the water-cooling plate (3) matches the internal size of the frame structure.

2. The box structure for an energy storage battery pack according to claim 1, characterized in that: The lower box frame (21) further includes a narrow cross beam (8). The narrow cross beam (8) is arranged along the width direction of the water-cooling plate (3), and both ends of the narrow cross beam (8) are respectively connected to the left frame (11) and the right frame (6).

3. The box structure for an energy storage battery pack according to claim 2, characterized in that: There are several narrow cross beams (8), and the several narrow cross beams (8) are evenly arranged at the bottom of the water-cooling plate (3).

4. The box structure for an energy storage battery pack according to claim 3, wherein: The lower box frame (21) further includes a front wide cross beam (9) and a rear wide cross beam (7) parallel to the narrow cross beam (8). The front wide cross beam (9) is arranged in the first half of the bottom of the water-cooling plate (3), and the rear wide cross beam (7) is arranged in the second half of the bottom of the water-cooling plate (3).

5. The box structure for an energy storage battery pack according to claim 4, characterized in that: Liquid leakage holes are designed on the narrow cross beam (8), the rear wide cross beam (7), and the front wide cross beam (9).

6. The box structure for an energy storage battery pack according to claim 5, wherein: The lower box frame (21) further includes short support blocks (4) and long support blocks (12) arranged along the length direction of the water-cooling plate (3). The short support blocks (4) and the long support blocks (12) are installed at intervals on the upper end of the narrow cross beam (8).

7. A box structure for an energy storage battery pack according to any one of claims 1 to 6, characterized in that: The upper module fixing beam (20) includes a front module beam (13), an intermediate module beam (14), and a rear module beam (2) arranged along the width direction of the water-cooling plate (3). The front module beam (13) and the rear module beam (2) are respectively arranged on the front and rear sides of the top of the water-cooling plate (3), and the intermediate module beam (14) is arranged in the middle of the top of the water-cooling plate (3).

8. The box structure for an energy storage battery pack according to claim 7, characterized in that: The box structure for the energy storage battery pack further includes a sealing ring (1). The sealing ring (1) is pasted around the water-cooling plate (3) through bottom surface adhesive.

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