CN220821767U - Battery box and battery pack - Google Patents

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery box and a battery pack. The battery box body comprises a frame structure, a thermal management assembly, a bottom guard plate and a plurality of connecting pieces; the frame structure comprises a frame component and a plurality of reinforcing beams, wherein the reinforcing beams are arranged in the frame component and are welded with the frame component; the heat management component is connected with the frame component and the plurality of reinforcing beams in a threaded manner, and the heat management component is connected with the frame component in a sealing manner; the bottom guard board is sealed and connected with the frame component in a threaded manner; the connecting piece is pressed from both sides and locates between thermal management subassembly and the backplate at the bottom, and the one end of connecting piece is connected in the backplate at the bottom, and the other end seals and wears to locate thermal management subassembly and be connected with the stiffening beam, and every stiffening beam corresponds to be equipped with at least one connecting piece. The battery box body can reduce the deformation caused by the welding process and welding, strengthen the connection of the bottom guard plate and the frame, ensure the structural strength and the tightness of the battery box body, solve the problem of poor flatness of the liquid cooling plate and facilitate the disassembly.

Description

Battery box and battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery box and a battery pack.

Background

Currently, in the field of new energy electric vehicles, lithium ion batteries are called one of the most ideal power sources of pure electric vehicles due to high charge density and low weight. In order to meet market demands, the battery pack needs to meet the requirements of safety and reliability of products, and therefore, in the design process of the battery pack, the battery box body often needs to meet the requirements of protection, structural protection, thermal protection and maintenance.

The existing battery box body comprises a frame and a bottom plate, the frame and the bottom plate are connected in a welding mode, the battery box body can be manufactured and molded, but the sealing performance and the strength of the box body are related to welding spots, and after the battery box body is subjected to subsequent vibration, tightness and other tests or long-term use, the conditions of tightness failure or cracking of the box body can be caused. To the integrated battery box of liquid cooling board, its liquid cooling board and box frame welded connection still need increase when processing and preapring for an unfavorable turn of events shape frock, when installing, the liquid cooling board only with the box frame between be connected can cause the problem that liquid cooling board middle part arch and flatness are poor, need the secondary to rework, and follow-up use is dismantled more difficultly, can't carry out effectual cyclic utilization to the important spare part of box.

Therefore, there is a need to design a battery case and a battery pack to solve the above-mentioned technical problems.

Disclosure of utility model

The utility model aims to provide a battery box body, which can reduce the welding procedure and deformation caused by welding, strengthen the connection between a bottom guard plate and a frame, ensure the structural strength and the tightness of the battery box body, solve the problem of poor flatness of a liquid cooling plate and is convenient to detach.

To achieve the purpose, the utility model adopts the following technical scheme:

A battery case, comprising:

The frame structure comprises a frame component and a plurality of reinforcing beams, wherein the reinforcing beams are arranged in the frame component and are welded with the frame component;

The heat management assembly is connected with the frame assembly and the plurality of stiffening beams in a threaded manner, and the heat management assembly is connected with the frame assembly in a sealing manner;

the bottom guard board is sealed and connected with the frame component in a threaded manner;

The connecting pieces are clamped between the thermal management assembly and the bottom guard plate, one end of each connecting piece is connected with the bottom guard plate, the other end of each connecting piece is hermetically penetrated through the thermal management assembly and connected with the reinforcing beam, and each reinforcing beam is correspondingly provided with at least one connecting piece.

Optionally, the connecting piece is provided with external threads, the reinforcing beam is provided with internal threads, and the connecting piece is in threaded connection with the reinforcing beam.

Optionally, the connecting piece is a waterproof bolt.

Optionally, a groove is formed in a side, facing the stiffening beam, of the mounting seat of the connecting piece, and a sealing ring is arranged in the groove.

Optionally, the thermal management assembly includes a temperature equalizing plate, a liquid cooling assembly and a PTC assembly, where the temperature equalizing plate is screwed on the frame assembly in a sealing manner, and the liquid cooling assembly and the PTC assembly are connected on one side of the bottom guard plate from the temperature equalizing plate Wen Banchao to the bottom guard plate.

Optionally, the liquid cooling assembly and the temperature equalizing plate and the PTC assembly and the temperature equalizing plate are all connected by adhesion.

Optionally, the liquid cooling assembly includes a liquid cooling pipeline and two connectors, two communicating ports of the liquid cooling pipeline are respectively communicated with the two connectors, and the connectors are hermetically penetrated in the temperature equalizing plate.

Optionally, the bottom guard board, the thermal management component and the frame component enclose an interlayer space, and an insulating layer and/or a buffer layer is arranged in the interlayer space.

Optionally, sealant is filled between the thermal management component and the frame component, and between the bottom guard board and the frame component.

Another object of the present utility model is to provide a battery pack, including a battery pack, a case cover, and the battery case according to any one of the above aspects, wherein the battery pack is disposed in a housing cavity of the battery case, and the case cover is disposed in the housing cavity and is hermetically connected to the battery case. The battery pack can reduce the deformation caused by the welding process and welding of the battery box body, strengthen the connection of the bottom guard plate and the frame, ensure the structural strength and the tightness of the battery box body, solve the problem of poor flatness of the liquid cooling plate and facilitate the disassembly.

The utility model has the beneficial effects that:

The utility model provides a battery box body and a battery pack, which are characterized in that the connection between a frame structure and a thermal management component is replaced by threaded connection, and meanwhile, the connection between the frame structure and a bottom guard plate is replaced by threaded connection, so that the welding procedure and the welding quantity are reduced, the manufacturing and assembly costs are reduced, the problem of welding deformation is avoided, the reliability of the battery box body is improved, the subsequent disassembly and maintenance are convenient, the frame structure, the bottom guard plate and the thermal management component can be recycled without damage and the like in the subsequent maintenance, and the maintenance cost is greatly reduced; and the edge and the middle part of the thermal management component and the middle part of the edge of the bottom guard plate are connected with the frame structure, so that the connection point of the thermal management component and the frame structure is increased, the connection point of the bottom guard plate and the frame structure is also increased, the connection strength of the thermal management component and the frame structure is ensured, and the connection strength of the bottom guard plate and the frame structure are improved, so that the planeness of the thermal management component and the bottom guard plate is improved. Further, the bottom guard plate is in sealing connection with the frame assembly, and the thermal management assembly is in sealing connection with the frame assembly, so that the tightness of the battery box body is guaranteed through double sealing.

Drawings

Fig. 1 is an isometric view of a battery compartment provided in an embodiment of the utility model;

Fig. 2 is an exploded view of a battery case according to an embodiment of the present utility model;

FIG. 3 is a bottom view of a battery case with a bottom shield removed according to an embodiment of the present utility model;

FIG. 4 is an enlarged view of a portion of a connection between a temperature equalization plate and a beam according to an embodiment of the present utility model;

Fig. 5 is an enlarged view of a portion of a connection of a connector to a beam according to an embodiment of the present utility model.

In the figure:

10. A frame structure; 11. a frame assembly; 111. edge beams; 112. lifting lugs; 113. a water gap; 12. a stiffening beam;

20. A thermal management assembly; 21. a temperature equalizing plate; 22. a liquid cooling assembly; 221. a liquid cooling pipeline; 222. a connection joint; 231. a PTC structure;

30. A bottom guard board;

40. A connecting piece; 41. a mounting base; 411. a groove; 42. a threaded column; 43. a seal ring;

50. An interlayer space; 60. and (5) a bolt.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a battery box, can reduce the deformation that welding process and welding brought, strengthened the connection of end backplate 30 and frame, guaranteed the structural strength and the leakproofness of battery box simultaneously, solved the poor problem of liquid cooling board plane degree, and convenient to detach.

Specifically, as shown in fig. 1 and 2, the above-described battery case includes a frame structure 10, a thermal management assembly 20, and a bottom shield 30. The frame structure 10 comprises a frame assembly 11 and a plurality of reinforcing beams 12, wherein the reinforcing beams 12 are arranged in the frame assembly 11 and are welded with the frame assembly 11; the frame assembly 11 and the plurality of reinforcing beams 12 are welded and connected to form the frame structure 10 of the battery box body, so that structural strength is provided for the battery box body, the strength of the frame structure 10 is reinforced through welded and connected, and the reliability of the battery box body is further improved.

Further, the thermal management assembly 20 is screwed on the frame assembly 11 and the plurality of reinforcing beams 12, and the thermal management assembly 20 is connected with the frame assembly 11 in a sealing manner; the structure ensures the connection between each position of the thermal management assembly 20 and the frame structure 10, further ensures the flatness of the thermal management assembly 20, ensures that the uneven bottom wall of the accommodating cavity formed by the thermal management assembly 20 and the frame structure 10 in the battery box body cannot occur, ensures the reliability of the subsequent battery pack installation, and is convenient to detach and maintain.

Still further, the bottom guard plate 30 is sealed and in threaded connection with the frame assembly 11, so that the bottom guard plate 30 and the frame assembly 11 are stably connected without welding connection, structures such as welding spots and the like are not needed, polishing is not needed again, manufacturing procedures are reduced, cost is saved, and disassembly and maintenance are convenient.

In order to further ensure the connection strength between the bottom guard plate 30 and the frame structure 10, the battery case further includes a plurality of connection members 40, and the connection members 40 are interposed between the thermal management assembly 20 and the bottom guard plate 30, giving a certain support to the thermal management assembly 20; one end of the connecting piece 40 is connected to the bottom guard plate 30, the other end of the connecting piece is hermetically penetrated through the thermal management assembly 20 and is connected with the reinforcing beams 12, and each reinforcing beam 12 is correspondingly provided with at least one connecting piece 40, so that the connection strength between the bottom guard plate 30 and the frame structure 10 is enhanced, each position of the bottom guard plate 30 is connected with the frame structure 10, the structural strength of the battery box body is improved, and the battery box body is convenient to detach and maintain.

The battery box body of the embodiment changes the connection between the frame structure 10 and the thermal management component 20 into the threaded connection, and simultaneously changes the connection between the frame structure 10 and the bottom guard plate 30 into the threaded connection, so that the welding procedure and the welding amount are reduced, the manufacturing and assembly costs are reduced, the problem of welding deformation is avoided, the reliability of the battery box body is improved, the subsequent disassembly and maintenance are convenient, the frame structure 10, the bottom guard plate 30 and the thermal management component 20 can be recycled without damage and other problems during subsequent maintenance, and the maintenance cost is greatly reduced; and, edge and middle part and the edge intermediate part of end backplate 30 of thermal management subassembly 20 all are connected with frame construction 10, have increased the tie point of thermal management subassembly 20 and frame construction 10, have also increased the tie point of end backplate 30 and frame construction 10, have guaranteed the tie point between the two, have improved the joint strength of thermal management subassembly 20 and frame construction 10, and the joint strength of end backplate 30 and frame construction 10 for the planarization of this thermal management subassembly 20 and end backplate 30 all obtains improving. Further, the bottom guard plate 30 and the frame assembly 11, and the thermal management assembly 20 and the frame assembly 11 are all in sealing connection, and the double sealing ensures the tightness of the battery box body.

Alternatively, as shown in FIGS. 3 and 4, the thermal management assembly 20 and the frame structure 10, as well as the bottom shield 30 and the rim assembly 11 (not shown) are all threadably coupled by bolts 60.

Optionally, the sealant is filled between the thermal management component 20 and the frame component 11 and between the bottom guard board 30 and the frame component 11, so that the connection strength between the thermal management component 20 and the frame component 11 and the connection strength between the bottom guard board 30 and the frame component 11 are further enhanced by the sealant, the connection of the above structure is more stable, the tightness of the battery box body is ensured by double sealing, and meanwhile, the structural strength of the battery box body can be improved.

Further alternatively, the sealant is an adhesive, and has good sealing performance and low cost.

In this embodiment, as shown in fig. 1 and 2, the frame assembly 11 includes a plurality of side beams 111, and the side beams 111 are sequentially connected to enclose the frame assembly 11 to protect and resist impact on the outer peripheral side of the cells inside the battery pack.

Alternatively, CMT welding (cold metal transition technology) is used for the welded connection between the side beams 111 and between the reinforcing beam 12 and the side beams 111, so that the welding is firm, the connection is reliable, and the rigid connection of the whole box body frame can be realized.

Optionally, at least part of the side beams 111 of the frame assembly 11 are provided with lifting lugs 112, and the lifting lugs 112 are used for lifting the battery pack, so that the subsequent battery box and the battery pack can be transported and lifted conveniently.

Further optionally, the frame assembly 11 is further provided with an insert mounting portion and two water inlets 113 for water inlet or outlet, so as to mount the insert in the battery pack and to allow for the ingress and egress of liquid in the thermal management assembly 20.

Optionally, the bottom of the edge beam 111 is stepped, with two stepped grooves, one of which is used to mount the bottom fender 30 and the other of which is used to mount the thermal management assembly 20.

Further, the portion of the plurality of reinforcing beams 12 in this embodiment is a cross beam, the other portion is a vertical beam, and the battery box is divided into a plurality of areas, so as to realize the division of the accommodating area of the battery pack in the battery box, the heat management pipeline area, and the placement area of other structures of the battery pack such as the high-voltage box, and meanwhile, the reinforcing beams 12 strengthen the connection between the side beams 111, so that the structural strength of the battery box is improved, and the battery box has better anti-collision capability in the horizontal direction.

It will be appreciated that whether the reinforcement beam 12 is a cross beam or a vertical beam may be modified according to actual needs, and is not particularly limited herein.

Further, threaded holes are formed in the top surfaces of the side beams 111 and the reinforcing beams 12, and are used for being connected with a case cover of the battery pack; the bottom of the side rails 111 and cross members are also provided with a plurality of threaded holes for connection with the bottom fender 30 and thermal management assembly 20.

Alternatively, the side beams 111 and the reinforcing beams 12 can be formed by extrusion of profiles, so that the structural strength is high, the cost is low, and the weight is light.

Further alternatively, the threaded holes on the side beam 111 and the reinforcing beam 12 may be rivet nuts, or nuts may be added to the side beam 111 and the reinforcing beam 12, or threaded holes may be added to the side beam 111 and the reinforcing beam 12, which is not particularly limited herein.

In order to achieve the connection between the connecting member 40 and the reinforcing beam 12, in this embodiment, the connecting member 40 is provided with external threads, the reinforcing beam 12 is provided with internal threads, and the connecting member 40 is screwed to the reinforcing beam 12, so that the two can be screwed together.

Preferably, the connecting piece 40 is a waterproof bolt, so that after the bottom guard plate 30 of the battery box body is damaged, water cannot enter the battery box body through the connecting piece 40, and the tightness of the inside of the battery box body is guaranteed.

Specifically, as shown in fig. 5, the connector 40 includes a mounting seat 41 and a threaded post 42, the threaded post 42 is screwed with the reinforcing beam 12, the mounting seat 41 is sandwiched between the thermal management assembly 20 and the bottom shield 30, and the mounting seat 41 is used for supporting the thermal management assembly 20.

Optionally, the mounting seat 41 of the connecting piece 40 is provided with a groove 411, and a sealing ring 43 is arranged in the groove 411, so that the sealing between the connecting piece 40 and the interior of the battery box body can be realized.

In order to simplify the installation of the thermal management assembly 20 and facilitate the disassembly of the thermal management assembly 20, as shown in fig. 2 and 3, in this embodiment, the thermal management assembly 20 includes a temperature equalizing plate 21, a liquid cooling assembly 22 and a PTC (Positive Temperature Coefficient, positive temperature coefficient thermistor) assembly, where the temperature equalizing plate 21 is used to assist the heat exchange between the liquid cooling assembly 22 and the PTC assembly and the battery pack, and the liquid cooling assembly 22 circulates a liquid, so that the battery pack can be cooled or heated, the PTC assembly can generate heat when energized, and the battery pack can be heated; the samming board 21 is sealed and threaded connection is in frame subassembly 11, and liquid cooling subassembly 22 and PTC subassembly are all connected in samming board 21 towards one side of backplate 30, if need change partial pipeline or PTC subassembly, can directly dismantle it and change, have saved the time, need not to change whole thermal management subassembly 20, have saved the cost, and are more convenient.

Optionally, as shown in fig. 4, a plurality of through holes are further provided on the temperature equalizing plate 21, and the through holes are used for penetrating the bolts 60 and the connecting pieces 40, so that the temperature equalizing plate 21 is fixedly connected with the frame assembly 11.

Alternatively, the liquid cooling assembly 22 and the temperature equalizing plate 21 and the PTC assembly and the temperature equalizing plate 21 are all connected by adhesion, so that the liquid cooling assembly 22 and the temperature equalizing plate 21 and the PTC assembly and the temperature equalizing plate 21 can be detachably connected.

Further, the PTC assembly includes a plurality of PTC structures 231, the PTC structures 231 include an aluminum tube and PTC, the PTC is integrated in the aluminum tube, and then the aluminum tube is bonded to the temperature equalization plate 21, thereby heating the battery pack in the battery case.

Still further, this liquid cooling subassembly 22 includes liquid cooling pipeline 221 and two attach fitting 222, and two intercommunication mouthfuls of liquid cooling pipeline 221 communicate respectively in two attach fitting 222, and attach fitting 222 seals and wears to locate samming board 21, and two attach fitting 222 communicate respectively in two mouth of a river 113, can realize the circulation of the liquid of this liquid cooling subassembly 22, and then realize the heat transfer to the group battery in the battery box.

In order to improve the heat insulation performance and/or the anti-collision performance of the battery box, in this embodiment, as shown in fig. 4 and 5, the bottom guard plate 30, the thermal management component 20 and the frame component 11 enclose to form an interlayer space 50, and an insulation layer and/or a buffer layer are arranged in the interlayer space 50, and the insulation layer can insulate the structure in the battery box, and the buffer layer can improve the anti-collision performance of the bottom of the battery box.

The interlayer space 50 may be provided with an insulating layer, a buffer layer, or both, and may be replaced according to actual needs, and is not particularly limited herein.

Optionally, the heat-insulating layer can be made of low-thermal-conductivity materials such as a low-density foaming polyurethane layer and the like, so that heat insulation of the structure in the battery box body can be realized. Optionally, the buffer layer can be made of materials such as a polypropylene honeycomb plate or supporting foam, has certain buffer performance, and has high strength and low cost.

The embodiment also provides a battery pack, which comprises a battery pack, a case cover and the battery box body according to any scheme, wherein the battery pack is arranged in the accommodating cavity of the battery box body, and the case cover is arranged in the accommodating cavity and is connected with the battery box body in a sealing manner. The battery box has all the effects of the battery box, and the details are not repeated here.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The battery box, its characterized in that includes:

The frame structure (10) comprises a frame component (11) and a plurality of reinforcing beams (12), wherein the reinforcing beams (12) are arranged in the frame component (11) and are connected with the frame component (11) in a welding mode;

A thermal management assembly (20) threadably coupled to said frame assembly (11) and said plurality of stiffening beams (12), said thermal management assembly (20) being sealingly coupled to said frame assembly (11);

a bottom shield (30) sealingly and threadably coupled to said rim assembly (11);

The connecting pieces (40) are clamped between the thermal management assembly (20) and the bottom guard plate (30), one end of each connecting piece (40) is connected to the bottom guard plate (30), the other end of each connecting piece (40) penetrates through the thermal management assembly (20) in a sealing mode and is connected with the reinforcing beam (12), and at least one connecting piece (40) is correspondingly arranged on each reinforcing beam (12).

2. The battery box according to claim 1, wherein the connecting member (40) is provided with an external thread, the reinforcement beam (12) is provided with an internal thread, and the connecting member (40) is screwed to the reinforcement beam (12).

3. The battery box according to claim 2, characterized in that the connection member (40) is a waterproof bolt.

4. A battery box according to claim 3, characterized in that a groove (411) is provided on the side of the mounting seat (41) of the connecting piece (40) facing the stiffening beam (12), and a sealing ring (43) is provided in the groove (411).

5. The battery box according to claim 1, wherein the thermal management assembly (20) comprises a temperature equalization plate (21), a liquid cooling assembly (22) and a PTC assembly, the temperature equalization plate (21) is sealed and screwed to the frame assembly (11), and the liquid cooling assembly (22) and the PTC assembly are both connected to a side of the temperature equalization plate (21) facing the bottom protection plate (30).

6. The battery case according to claim 5, wherein the liquid cooling assembly (22) and the temperature equalization plate (21) are adhesively connected to each other, and the PTC assembly and the temperature equalization plate (21) are adhesively connected to each other.

7. The battery box as claimed in claim 6, wherein the liquid cooling assembly (22) comprises a liquid cooling pipeline (221) and two connecting joints (222), two communicating ports of the liquid cooling pipeline (221) are respectively communicated with the two connecting joints (222), and the connecting joints (222) are hermetically penetrated through the temperature equalizing plate (21).

8. The battery box according to any one of claims 1-7, wherein the bottom guard plate (30), the thermal management assembly (20) and the frame assembly (11) enclose an interlayer space (50), and a heat insulation layer and/or a buffer layer is/are arranged in the interlayer space (50).

9. The battery compartment of any of claims 1-7, wherein a sealant is filled between the thermal management assembly (20) and the rim assembly (11) and between the bottom shield (30) and the rim assembly (11).

10. A battery pack, characterized by comprising a battery pack, a case cover and the battery case body according to any one of claims 1-9, wherein the battery pack is arranged in a containing cavity of the battery case body, and the case cover is arranged in the containing cavity and is connected with the battery case body in a sealing manner.