Box body structure and battery box

Abstract

The utility model relates to a box body structure and a battery box. The box body structure comprises a box body frame and a liquid cooling plate, wherein the box body frame is detachably connected with the liquid cooling plate; the box body frame comprises an edge beam, the edge beam is arranged to be in an annular shape, a first cavity is formed in the contact position of the outer side of the edge beam and the liquid cooling plate, and the first cavity extends in the length direction of the edge beam to form an annular shape; the first cavity is filled with a sealing piece, and the sealing piece seals the space between the boundary beam and the liquid cooling plate, and the liquid cooling device has the advantages that the structure is simple, the technology is simple, the sealing effect is excellent, the cost is low, the energy density of the whole package cannot be affected, and the manufacturing process quality inspection is convenient and fast.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of PACK box, in particular to a box structure and battery box. BACKGROUND

[0002] Battery PACK (Power Battery Pack) is a key component for energy storage systems and electric vehicles, its main function is to assemble multiple single cells into a whole to provide stable power output and ensure the safety and reliability of the battery during use. The bottom structure design of battery PACK box, as an important part of electric vehicles and energy storage equipment, is crucial, not only to meet the basic requirements of support and heat dissipation, but also to have good sealing performance to prevent water, dust and other external environment from damaging the battery pack.

[0003] The existing box structure is mainly composed of a box frame, a liquid cooling plate and a bottom guard plate, the box frame is fixed with the liquid cooling plate by bolts or welding, in order to improve the overall sealing performance of the PACK box, the sealing between the box frame and the liquid cooling plate is needed, usually through the contact surface glue sealing process, friction stir welding process or double sealing design of foam plus structural adhesive to realize sealing.

[0004] However, for the contact surface glue sealing process, the glue layer thickness is generally controlled at 0.3mm, the very thin glue layer is difficult to maintain uniformity in actual production, combined with the uneven contact surface of the box frame beam and the liquid cooling plate, the glue layer will be squeezed out or form a gap at the local convex, which is prone to sealing failure, for the friction stir welding process, not only the process is complex, but also the process control requirement is high, in addition, the substrate thickness needs to meet the requirements of friction stir welding, which increases the weight of the box and the cost, and affects the overall energy density, for the double sealing design of foam plus structural adhesive, the material and process cost is high, which increases the production burden.

[0005] In summary, the sealing design of the bottom structure of the current PACK box has the problems of complex process, high production cost, high risk of sealing failure and reduced overall energy density, therefore, an improved design scheme is needed to simplify the production process, reduce the cost and improve the sealing performance, in order to ensure the sealing reliability and overall economy of the battery PACK box. INVENTION CONTENTS

[0006] Therefore, the utility model aims at providing a box structure and battery box which is simple, low in cost, low in process implementation difficulty and excellent in sealing effect, in order to solve the technical problems of complex sealing process, high production cost, high risk of sealing failure and reduced overall energy density in the prior art.

[0007] The utility model provides a box structure, including box frame and liquid cooling board, the box frame and liquid cooling board detachable connection,

[0008] The box frame includes a side beam, which is arranged in a ring shape, and a first cavity is arranged at the outer side of the side beam in contact with the liquid cooling board, and the first cavity extends along the length direction of the side beam in a ring shape.

[0009] The first cavity is filled with a sealing element, which seals between the side beam and the liquid cooling board.

[0010] Optionally, the liquid cooling board includes a flow channel plate and a liquid cooling board bottom plate, the liquid cooling board bottom plate is arranged on the side of the flow channel plate facing the box frame, and the liquid cooling board bottom plate and the flow channel plate are connected.

[0011] Optionally, a binding edge is arranged on the outer edge of the liquid cooling board bottom plate, the binding edge extends towards the side beam, the binding edge surrounds the side beam, and a first cavity is formed between the binding edge and the periphery of the side beam.

[0012] Optionally, a first groove is formed on the side of the side beam facing the liquid cooling board, the first groove extends along the length direction of the side beam in a ring shape, the first groove extends to the inner side wall of the side beam and penetrates through the inner side wall of the side beam, a second cavity is formed between the inner wall of the first groove and the liquid cooling board bottom plate, and a sealing element is filled in the second cavity to seal between the side beam and the liquid cooling board.

[0013] Optionally, the box frame further includes an internal beam arranged in the side beam, both ends of the internal beam are connected with the inner wall of the side beam, and the internal space of the side beam is divided into multiple cavities by the internal beam.

[0014] Optionally, the internal beam and the liquid cooling board bottom plate are sealed by a sealing element.

[0015] Optionally, a second groove is formed on the side of the internal beam facing the liquid cooling board bottom plate, the second groove is arranged along the length direction of the internal beam and penetrates through both ends of the internal beam, a third cavity is formed between the inner wall of the second groove and the liquid cooling board bottom plate, and the sealing element is filled in the third cavity.

[0016] Optionally, the second groove extends to the side of the internal beam opposite to the inner wall of the side beam and penetrates through the side wall of the internal beam.

[0017] Optionally, two second grooves are arranged, and the two second grooves respectively extend to the two sides of the internal beam opposite to the inner wall of the side beam and respectively penetrate through the two sides of the internal beam.

[0018] The utility model also provides a battery box, including the box body structure.

[0019] The technical scheme of the utility model has the following advantages:

[0020] 1. The box body structure provided by the utility model, by setting the first cavity at the contact position of the outer side of the edge beam and the liquid cooling plate, and filling the first cavity with a sealing element, a stable sealing structure is formed, the edge beam can be effectively prevented from dust and water, the risk of water leakage and air leakage is completely isolated, the risk of water leakage and air leakage caused by the sealing failure of the contact surface flatness of the edge beam and the liquid cooling plate can be ignored, compared with the friction stir welding process, the process is simpler, the thickness of the edge beam and the liquid cooling plate does not need to be changed, the bottom structure weight is not increased, the cost is not increased, the whole package energy density is not affected, money is saved, a double-layer sealing design of foam and structural glue is not needed, unnecessary material management and loss are reduced, the whole structure is simple, the process is simple, the sealing effect is excellent, the cost is low, the whole package energy density is not affected, and process quality inspection is convenient and fast.

[0021] 2. The box body structure provided by the utility model, by setting a plurality of internal beams in the edge beam, a plurality of cavities are formed in the edge beam, these cavities can be used for mounting battery packs, battery management systems and other components, a third cavity is formed between the internal beam side wall and the liquid cooling plate bottom plate, and a sealing element is filled in the third cavity, the plurality of cavities are sealed, so that after some cavities leak, the internal beams can prevent water from penetrating into other cavities, and the loss caused by water leakage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can be obtained without the creative labor on the premise of the drawings.

[0023] Figure 1 It is a three-dimensional structure schematic view of the box body structure of the utility model;

[0024] Figure 2 It is an explosion schematic view of the box body structure in the utility model;

[0025] Figure 3 It is a sectional view of the internal structure of the box body structure in the utility model;

[0026] Figure 4 It is Figure 3 The enlarged view of A part in the utility model;

[0027] Figure 5For Figure 3 Enlarged view of middle B section.

[0028] Reference numerals:

[0029] 1, box bottom guard plate; 2, liquid cooling plate; 21, liquid cooling plate bottom plate; 22, flow channel plate; 3, box frame; 31, edge beam; 32, internal beam; 33, side beam; 4, edge cover; 5, first cavity; 6, sealing element; 7, first groove; 8, second groove; 9, knurled screw. DETAILED DESCRIPTION

[0030] The specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the description of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0031] Unless otherwise explicitly specified and limited, the terms "provided", "installed", "connected" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] The terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the present application when it is usually placed, and are only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] The terms "first", "second", "third" and the like are only for distinguishing similar attributes of elements, and do not indicate or imply relative importance or a particular order.

[0034] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0035] Example 1

[0036] Referring to Figures 1-5As shown in the utility model provides a kind of box structure, including box frame 3, liquid cooling plate 2 and box bottom guard plate 1, wherein box frame 3, liquid cooling plate 2 and box bottom guard plate 1 are arranged from top to bottom, and all are horizontally arranged, box frame 3 is detachably connected by bolt and liquid cooling plate 2, box bottom guard plate 1 is arranged below liquid cooling plate 2 and connected with liquid cooling plate 2;

[0037] Box frame 3 includes edge beam 31, edge beam 31 is arranged annularly, and a first cavity 5 is arranged at the contact position between the outer side of edge beam 31 and liquid cooling plate 2. The first cavity 5 extends along the length direction of edge beam 31 until the first cavity 5 is connected at the head and tail, thereby forming an annular shape. At this time, the first cavity 5 surrounds the edge beam 31. The first cavity 5 is filled with a sealing element 6. The sealing element 6 seals the space between the edge beam 31 and the liquid cooling plate 2. In this embodiment, the sealing element 6 can be a sealant.

[0038] By arranging the first cavity 5 at the contact position between the outer side of edge beam 31 and liquid cooling plate 2, and filling the first cavity 5 with a sealing element 6, a stable sealing structure is formed. This can effectively prevent dust and water from entering the surrounding area of edge beam 31. The surrounding area is completely isolated from the risk of water leakage and air leakage. Compared with the method of applying glue to the contact surface between edge beam 31 and liquid cooling plate 2, the process control is difficult when the glue thickness is controlled to be 0.3 mm. In addition, the unevenness of the contact surface between edge beam 31 and liquid cooling plate 2 does not affect the sealing effect of the sealing element 6 in the first cavity 5. The sealing element 6 is not affected by the flatness of the contact surface between edge beam 31 and liquid cooling plate 2, which can prevent water leakage and air leakage. Compared with the friction stir welding process, the process is simpler, and the thickness of edge beam 31 and liquid cooling plate 2 does not need to be changed. This will not increase the weight of the bottom structure and the cost. It will not affect the overall energy density. Compared with the double-sealing design of foam and structural glue, it is more cost-effective and has lower cost. It reduces unnecessary material management and loss. The overall structure is simple, the process is simple, the sealing effect is excellent, the cost is low, and it will not affect the overall energy density. The process quality inspection is convenient and fast.

[0039] As a specific embodiment, refer to Figure 2 As shown in the utility model, the liquid cooling plate 2 includes a horizontally arranged flow channel plate 22 and a liquid cooling plate bottom plate 21. The liquid cooling plate bottom plate 21 is arranged on the side of the flow channel plate 22 facing the box frame 3. The liquid cooling plate bottom plate 21 is connected with the flow channel plate 22.

[0040] In order to form the first cavity 5, the outer edge of the liquid cooling plate bottom plate 21 is provided with a rim 4, the rim 4 is arranged in a ring shape, and the rim 4 extends towards the edge beam 31, the rim 4 is in an open state, surrounding the edge beam 31, and the space between the rim 4 and the outer periphery of the edge beam 31 forms a ring-shaped first cavity 5. By arranging the rim 4 on the liquid cooling plate bottom plate 21 to form the first cavity 5, the molding is convenient, and at the same time, a stable sealing structure can be formed, so that the edge beam 31 can be effectively prevented from dust and water, and the risk of complete isolation of water leakage and air leakage is avoided.

[0041] As another embodiment, referring to Figure 4 The edge beam 31 is provided with a first groove 7 on the side facing the liquid cooling plate 2, the first groove 7 is arranged on the inner side of the edge beam 31, the first groove 7 extends along the length direction of the edge beam 31 in a ring shape, and the first groove 7 further extends to the inner side wall of the edge beam 31 until it penetrates through the inner side wall of the edge beam 31. The inner wall of the first groove 7 and the liquid cooling plate bottom plate 21 form a second cavity, and the second cavity is also arranged in a ring shape. The second cavity is filled with a sealing member 6, and the sealing member 6 fills the second cavity. By forming the second cavity on the inner side of the edge beam 31 and filling the sealing member 6, the inner and outer sides of the edge beam 31 are sealed, thereby ensuring the sealing effect and improving the sealing performance.

[0042] As another embodiment, referring to Figure 1 and Figure 5 The box frame 3 further comprises an internal beam 32, and the internal beam 32 is provided in multiple. In the embodiment, the internal beam 32 can be provided as a horizontal beam and a vertical beam, and in other embodiments, the internal beam 32 can be provided as only a horizontal beam or only a vertical beam, which is not limited herein. In the embodiment, the internal beam 32 is horizontally arranged, and the internal beam 32 is surrounded by the edge beam 31, and the two ends of the internal beam 32 are tightly abutted and connected with the inner wall of the edge beam 31. By arranging the internal beam 32, the internal space of the edge beam 31 is divided into multiple cavities, which can be used to install battery packs, battery management systems and other components, and different components are separated.

[0043] In addition, in order to seal the multiple cavities and not affect each other, the internal beam 32 and the liquid cooling plate bottom plate 21 are sealed by a sealing member 6. Specifically, the internal beam 32 is provided with a second groove 8 on the side facing the liquid cooling plate bottom plate 21, the second groove 8 extends along the length direction of the internal beam 32 and penetrates through both ends of the internal beam 32, and the inner wall of the second groove 8 and the liquid cooling plate bottom plate 21 form a third cavity. The sealing member 6 is filled in the third cavity, and the sealing member 6 fills the third cavity, thereby sealing the multiple cavities, thereby avoiding the penetration of water leakage in some cavities to other cavities through the internal beam 32, and reducing the loss caused by water leakage.

[0044] Further, referring to Figure 5As shown, the second groove 8 is provided on the side of the inner beam 32 facing the inner wall of the side beam 31, and the second groove 8 extends toward the side of the inner wall of the inner beam 32 opposite the side beam 31 and penetrates the side wall of the inner beam 32. In this embodiment, two second grooves 8 are provided, and the two second grooves 8 extend toward the two sides of the inner wall of the inner beam 32 opposite the side beam 31 and penetrate the two sides of the internal beam 32 respectively, so that a third cavity is formed on both sides of the left and right sides of the internal beam 32. At this time, the sealing effect between the internal beam 32 and the liquid cooling plate bottom plate 21 is the best, ensuring the sealing effect, thereby effectively preventing water from leaking into other chambers through the internal beam 32 after some chambers leak, thereby reducing the loss caused by water leakage.

[0045] As a specific implementation method, refer to Figure 1 As shown, a plurality of roughened screws 9 are provided on the side of the side beam 31 facing away from the liquid cooling plate 2. The plurality of roughened screws 9 are evenly arranged on the top of the side beam 31 so as to be used to connect the battery box cover. The outer side wall of the side beam 31 is connected to the side beam 33. At this time, the side beam 33 can be used to connect to the car to fix the battery box.

[0046] Example 2

[0047] Reference Figures 1-5 As shown, this embodiment provides a battery box, including the bottom structure of the battery box in Example 1 and a battery box cover (not shown in the figure), the battery box cover and the side beam 31 are connected by a brushed screw 9, and a first cavity 5 is provided at the contact point between the outer side of the side beam 31 and the liquid cooling plate 2, and the first cavity 5 is filled with a seal 6, thereby forming a stable sealing structure, so that the side beam 31 can be effectively dustproof and waterproof all around, and the risks of water leakage and air leakage are completely isolated all around. Compared with the method of applying glue on the contact surface of the side beam 31 and the liquid cooling plate 2, there is no need to control the glue thickness to 0.3mm, which makes process control difficult, and at this time, the contact surface of the side beam 31 and the liquid cooling plate 2 is uneven. It will not affect the sealing effect of the seal 6 in the first cavity 5, and will not ignore the risk of water leakage and air leakage caused by sealing failure due to the flatness problem of the contact surface between the side beam 31 and the liquid cooling plate 2. Compared with the stir friction welding process, the process is simpler, and there is no need to change the thickness of the side beam 31 and the liquid cooling plate 2. It will not cause the weight of the bottom structure to increase, the cost to rise, and will not affect the energy density of the whole package. Compared with the double-layer sealing design of foam plus structural adhesive, it is more cost-effective and has lower cost, reducing unnecessary material management and loss. The overall structure is simple, the process is simple, the sealing effect is excellent, the cost is low, and it will not affect the energy density of the whole package. The process quality inspection is convenient and fast.

[0048] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0049] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A box structure, characterized by, The box frame (3) and the liquid cooling plate (2) are detachably connected; The box frame (3) comprises a side beam (31), which is arranged in a ring shape, and a first cavity (5) is arranged at the outer side of the side beam (31) in contact with the liquid cooling plate (2), and the first cavity (5) extends along the length direction of the side beam (31) in a ring shape; The first cavity (5) is filled with a sealing member (6), which seals between the side beam (31) and the liquid cooling plate (2).

2. The box structure of claim 1, wherein, The liquid cooling plate (2) comprises a flow channel plate (22) and a liquid cooling plate bottom plate (21), and the liquid cooling plate bottom plate (21) is arranged on the side of the flow channel plate (22) facing the box frame (3), and the liquid cooling plate bottom plate (21) and the flow channel plate (22) are connected.

3. The box structure of claim 2, wherein, An edge cover (4) is arranged on the outer edge of the liquid cooling plate bottom plate (21), which extends towards the side beam (31), surrounds the side beam (31), and forms a first cavity (5) between the edge cover (4) and the periphery of the side beam (31).

4. The box structure of claim 2, wherein, A first groove (7) is arranged on the side of the side beam (31) facing the liquid cooling plate (2), which extends along the length direction of the side beam (31) in a ring shape, extends to the inner side wall of the side beam (31), and penetrates through the inner side wall of the side beam (31), and a second cavity is formed between the inner wall of the first groove (7) and the liquid cooling plate bottom plate (21), which is filled with a sealing member (6) to seal between the side beam (31) and the liquid cooling plate (2).

5. The box structure of claim 2, wherein, The box frame (3) further comprises an internal beam (32) arranged in the side beam (31), and the two ends of the internal beam (32) are connected with the inner wall of the side beam (31), and the internal space of the side beam (31) is divided into multiple cavities by the internal beam (32).

6. The box structure of claim 5, wherein, The internal beam (32) and the liquid cooling plate bottom plate (21) are sealed by a sealing member (6).

7. The box structure of claim 6, wherein, A second groove (8) is arranged on the side of the internal beam (32) facing the liquid cooling plate bottom plate (21), which is arranged along the length direction of the internal beam (32) and penetrates through the two ends of the internal beam (32), and a third cavity is formed between the inner wall of the second groove (8) and the liquid cooling plate bottom plate (21), and the sealing member (6) is filled in the third cavity.

8. The box structure of claim 7, wherein, The second groove (8) extends to the side of the internal beam (32) opposite to the inner wall of the side beam (31) and penetrates through the side wall of the internal beam (32).

9. The box structure of claim 8, wherein, The second groove (8) is provided with two, and the two second grooves (8) respectively extend to the two sides of the internal beam (32) opposite to the inner wall of the side beam (31) and respectively penetrate through the two sides of the internal beam (32).

10. A battery box characterized by The box structure comprises the box structure according to any one of claims 1 to 9.

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