CN109950441B

CN109950441B - Battery pack

Info

Publication number: CN109950441B
Application number: CN201910198749.4A
Authority: CN
Inventors: 马晓磊; 张新意; 姜大威; 周巍; 樊翚
Original assignee: Bluepark System Branch Of Baic New Energy Motor Co ltd; Beijing Electric Vehicle Co Ltd
Current assignee: Bluepark System Branch Of Baic New Energy Motor Co ltd; Beijing Electric Vehicle Co Ltd
Priority date: 2019-03-15
Filing date: 2019-03-15
Publication date: 2022-06-21
Anticipated expiration: 2039-03-15
Also published as: CN109950441A

Abstract

The invention discloses a battery pack, comprising: the device comprises a bottom plate assembly, a current collecting pipeline and a battery module. The bottom plate assembly comprises heat exchange plates and support plates which are alternately arranged, and the heat exchange plates are provided with heat exchange cavities which are longitudinally communicated; the collecting pipes are arranged at two ends of the heat exchange plate and are communicated with the heat exchange cavity; the two ends of the battery module are fixedly connected with the two supporting plates respectively, and the heat exchange plate is connected between the two supporting plates. The battery pack combines the heat exchange system and the bottom plate assembly in the battery box body together, so that the overall structure of the battery pack is more compact, the purpose of reducing weight of the battery pack can be effectively realized, and the battery box body can effectively protect the heat exchange system.

Description

Battery pack

Technical Field

The invention relates to the technical field of vehicles, in particular to a battery pack.

Background

The heat exchange system and the battery box body in the traditional battery pack are of two completely independent structures, so that the heat exchange system occupies a larger space in the battery pack, the overall structure of the battery pack is not compact, the protection performance is poor, and an improved space exists.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a battery pack which is more compact in overall structure, lower in weight and better in protection performance.

A battery pack according to an embodiment of the present invention includes: the bottom plate assembly comprises heat exchange plates and support plates which are alternately arranged, and the heat exchange plates are provided with longitudinally-through heat exchange cavities; the collecting pipelines are arranged at two ends of the heat exchange plate and are communicated with the heat exchange cavity; and the battery module is connected with the heat exchange plate through a heat conducting medium.

According to the battery pack provided by the embodiment of the invention, the heat exchange system and the bottom plate assembly in the battery box body are combined together, so that the overall structure of the battery pack is more compact, the purpose of reducing the weight of the battery pack can be effectively realized, and the battery box body can effectively protect the heat exchange system.

In addition, the battery pack according to the embodiment of the invention may further have the following additional technical features:

according to some embodiments of the invention, the header pipe comprises a header pipe and a pipe joint, the header pipe is arranged at an end of the heat exchange plate and is communicated with the heat exchange cavity.

According to some embodiments of the present invention, the heat exchange cavities of the plurality of heat exchange plates are connected in parallel through a header pipe and a pipe joint connecting two adjacent header pipes, and a heat exchange medium flows from one end to the other end of the plurality of heat exchange plates along the same direction in the plurality of heat exchange cavities inside the plurality of heat exchange plates.

According to some embodiments of the invention, the battery pack further comprises: the flow distribution component is clamped between the heat exchange plate and the collecting pipe, the flow distribution component is provided with a plurality of groups of throttling holes, and the collecting pipe is communicated with the heat exchange cavity through the throttling holes.

According to some embodiments of the present invention, the collecting pipe has a main circulation chamber and a plurality of branch holes communicated with the main circulation chamber, the branch holes are disposed corresponding to the throttle holes, and the plurality of heat exchange chambers of the heat exchange plate are connected in parallel through the collecting pipe.

According to some embodiments of the invention, the flow distribution element regulates the flow by regulating the number and/or position and/or aperture of the orifices.

According to some embodiments of the invention, the flow area of the orifice is smaller than the flow area of the open end of the heat exchange chamber, and the flow area of the orifice at both ends of the flow distribution member is larger than the flow area of the orifice at the middle.

According to some embodiments of the present invention, at least one of the plurality of headers has a connection port for communicating with an external water path, and a total flow passage area of all the orifices in the flow distribution part increases as a distance from the flow distribution part to the connection port increases.

According to some embodiments of the invention, the battery pack further comprises: the side frame comprises a first end arm, a second end arm and an isolation section, the isolation section is connected between the first end arm and the second end wall, an open cavity is defined by the first end arm, the second end arm and the isolation section, the bottom plate assembly seals an opening of the cavity, and the flow collecting pipeline is arranged in the cavity.

According to some embodiments of the invention, the base plate assembly comprises heat exchange plates and support plates arranged in a staggered manner, and the first end arms of the side frames are connected with the upper surfaces of the heat exchange plates and the support plates.

According to some embodiments of the invention, an end of the support plate is connected to the second end arm of the side frame to close the opening of the cavity at a corresponding position.

According to some embodiments of the invention, the bottom plate assembly further comprises a patch panel connecting the second end arm of the side frame and the end of the heat exchanger panel to close the opening of the cavity at a corresponding position.

According to some embodiments of the invention, the patch panel has a first end, a second end, and a third end and a fourth end; the first end of the patch plate is connected with the second end arm of the side frame, and the second end of the patch plate is connected with the end part of the heat exchange plate; at least one of the third end and the fourth end of the patch panel is connected with the adjacent support plate.

According to some embodiments of the invention, the heat exchange plate and the support plate are connected by plugging through a plugging structure.

According to some embodiments of the invention, the battery module is positioned above the heat exchange plate and spans between two adjacent support plates, and two ends of the battery module are respectively installed with the support plates; the battery module with press from both sides between the heat transfer board and be equipped with the heat conduction silica gel of many spaced apart settings.

According to some embodiments of the invention, the battery pack further comprises: the cover plate is connected to the end portions of the side frames, sealing strips are clamped between the cover plate and the side frames, the sealing strips are provided with inwards-bent avoidance sections, the cover plate is connected with the side frames through connecting structures, and the connecting structures are located on the outer sides of the avoidance sections and spaced apart from the sealing strips.

According to some embodiments of the invention, the cover plate is provided with a sealing groove recessed away from the side frame, the sealing strip is arranged in the sealing groove, the sealing groove comprises a plurality of linear groove sections and an avoiding groove section which are arranged in a staggered manner and connected in sequence, the connecting structure is connected to the outer side of the avoiding groove section, and at least part of the connecting structure is arranged opposite to the linear groove section along the extending direction of the linear groove section.

According to some embodiments of the invention, the cover plate comprises: the upper cover is connected with the upper surface of the side frame, and the battery module is arranged in an accommodating space defined by the upper cover, the side frame and the bottom plate assembly; the bottom guard plate is connected with the lower surface of the side frame and is positioned below the bottom plate assembly.

According to some embodiments of the invention, the bottom shield is spaced apart from the floor assembly to define a protective cavity, and the protective cavity is filled with a cushion fill.

Drawings

Fig. 1 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 2 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 3 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 4 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 5 is a partial sectional view of a battery pack according to an embodiment of the present invention;

fig. 6 is a partial sectional view of a battery pack according to an embodiment of the present invention;

fig. 7 is a partial sectional view of a battery pack according to an embodiment of the present invention;

fig. 8 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 9 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 10 is a partial sectional view of a battery pack according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a flow distribution component according to an embodiment of the invention;

FIG. 12 is a schematic structural diagram of a flow distribution component according to an embodiment of the invention;

fig. 13 is a partial cross-sectional view of a battery pack according to an embodiment of the present invention;

fig. 14 is a schematic structural view of a pipe joint according to an embodiment of the present invention;

fig. 15 is a partial structural schematic view of a pipe joint according to an embodiment of the present invention;

fig. 16 is a sectional view of a pipe joint according to an embodiment of the present invention;

fig. 17 is a partial sectional view of a pipe joint according to an embodiment of the present invention;

fig. 18 is a partial structural schematic view of a pipe joint according to an embodiment of the present invention;

fig. 19 is a partial structural view of a battery pack according to an embodiment of the present invention;

fig. 20 is a partial sectional view of a battery pack according to an embodiment of the present invention;

fig. 21 is a partial cross-sectional view of a battery pack according to an embodiment of the present invention;

fig. 22 is a schematic structural view of a battery pack according to an embodiment of the present invention;

FIG. 23 is an assembly view of the upper cover plate and side frame according to an embodiment of the present invention;

FIG. 24 is a schematic view showing the positions of a sealing tape and a connecting structure according to an embodiment of the present invention;

FIG. 25 is a schematic view of the attachment of the bottom cover sheet to the side frame according to an embodiment of the present invention;

FIG. 26 is an assembly view of the skirt and side frame according to an embodiment of the invention;

FIG. 27 is an assembly view of a skirt and side frame according to an embodiment of the present invention.

Reference numerals:

battery pack 100, side frame 1, bottom plate assembly 2, collecting pipe 3, cavity 11, heat exchange plate 21, heat exchange cavity 211, first end arm 12, second end arm 13, isolation section 14, support plate 22, patch plate 23, collecting pipe 31, pipe joint 32, flow distribution component 4, orifice 41, main flow cavity 311, branch hole 312, connection port 313, energy absorbing structure 15, protective structure 16, reinforcing rib 17, upper protective section 161, outer protective section 162, boss 212, overlap edge 314, insertion groove 7, insertion boss 8, guide surface 81, support surface 71, side plate 82, step surface 72, first leg 213, weight reducing cavity 221, second leg 222, bottom protective plate 301, protective cavity 302, end orifice 411, middle orifice 412, connection pipe 321, sealing sleeve 322, sealing structure 1, first structure 3222, notch 32221, sleeve body section 3223, sealing section 3224, sealing ring 32211, groove 32212, the battery module comprises an axial limiting flange 3225, a mounting groove 3211, a battery module 9, an upper cover plate 10, a sealing strip 101, an avoiding section 1011, a connecting structure 102, a sealing groove 103, a linear groove section 1031, an avoiding groove section 1032, a flanging 104, a protection boss 105, a buffering filler 106, an energy absorbing layer 1061, a foam layer 1062 and a foam plate 1063.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

A battery pack 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 27.

The battery pack 100 according to an embodiment of the present invention may include: a bottom plate component 2, a current collecting pipeline 3 and a battery module 9.

As shown in fig. 1-4, the bottom plate assembly 2 includes heat exchange plates 21 and support plates 22 arranged alternately, and further, a plurality of heat exchange plates 21 and a plurality of support plates 22 are arranged in a staggered manner along a horizontal direction. Wherein, backup pad 22 is used for supporting fixed battery module 9, and two adjacent backup pads 22 fixed connection are same battery module 9 to make battery module 9 can span heat transfer board 21 and can hug closely the setting with heat transfer board 21, in order to realize effectual heat transfer.

Because the arrangement condition in the traditional battery pack 100 is that the heat exchange plate 21 is fixed on the support plate 22, and the battery module 9 is arranged on the heat exchange plate 21, the weight of the battery pack 100 is large, and the occupied space is large. Therefore, in the embodiment of the present invention, a part of the supporting plate 22 is replaced by the heat exchanging plate 21, so that the heat exchanging plate 21 has both the heat exchanging function and the function of supporting the battery module 9, thereby realizing a structure and two functions, and making the overall structure of the battery pack 100 more compact, effectively reducing the number of structures in the battery pack 100, and further reducing the weight of the battery pack 100.

As shown in fig. 8 and 9, the heat exchange plate 21 has a heat exchange cavity 211 for circulating a heat exchange medium, and the header 31 is adapted to communicate with the heat exchange cavity 211, so as to input the heat exchange medium, which enters the header 31 from the outside, into the heat exchange plate 21, thereby achieving effective heat exchange on the battery module 9.

As shown in fig. 1-4, two ends of the battery module 9 are respectively fixedly connected to two support plates 22, and a heat exchange plate 21 is connected between the two support plates 22. Battery module 9 is located heat transfer board 21 top and spanes between two adjacent backup pads 22, and the both ends of battery module 9 are installed respectively in backup pad 22 to make battery module 9 can span heat transfer board 21 and can hug closely the setting with heat transfer board 21, in order to realize effectual heat transfer.

And the battery module is connected with the heat exchange plate through a heat conducting medium. Therefore, the heat exchange effect can be better.

According to the battery pack 100 provided by the embodiment of the invention, the battery pack 100 combines the heat exchange system with the bottom plate assembly 2 in the battery box body, so that the overall structure of the battery pack 100 is more compact, the purpose of reducing the weight of the battery pack 100 can be effectively realized, and the battery box body can effectively protect the heat exchange system.

In combination with the embodiment shown in fig. 20 and 21, the frame body includes a first end arm 12, a second end arm 13, and an isolation section 14, and the isolation section 14 is connected between the first end arm 12 and the second end arm 13, wherein the first end arm 12, the second end arm 13, and the isolation section 14 define a cavity 11 that is open downward, wherein the bottom plate assembly 2 includes heat exchange plates 21 and support plates 22 that are arranged in a staggered manner, and the lower end of the first end arm 12 is higher than the lower end of the second end arm 13 so that the lower end of the cavity 11 is open inward, so that the heat exchange plates 21 can extend into the cavity 11 from the open position and are connected with the header 31, so as to realize the circulation flow of the heat exchange medium in the heat exchange system of the entire battery pack 100.

Further, as shown in fig. 20, the first end arm 12 of the side frame 1 is connected to the upper surfaces of the heat exchange plate 21 and the support plate 22, so that the heat exchange plate 21 and the support plate 22 can completely block the opening of the cavity, which is open to the inside, and further complete sealing of the cavity is achieved, and heat exchange medium leaked from the collecting pipe 31 is prevented from flowing into the installation space of the battery module 9 through the opening, so as to ensure the safety of the battery module 9.

Still further, since the supporting plate 22 does not need to be connected to the branch hole 312 of the collecting main 31, the end of the supporting plate 22 can be directly connected to the second end arm 13 of the side frame 1 to close the opening of the cavity 11 at the corresponding position, thereby completing the complete sealing of the cavity 11. The supporting plate 22 also serves to support the header 31, so that the header 31 can be more stably disposed in the cavity.

As shown in fig. 21, since the end of the heat exchange plate 21 needs to be directly connected to the branch hole 312 of the header 31, the heat exchange plate 21 cannot extend to the second end arm 13, and therefore, the bottom plate assembly 2 is further provided with the patch plate 23, so that the patch plate 23 connects the second end arm 13 of the side frame 1 and the end of the heat exchange plate 21 to close the opening of the cavity 11 at the corresponding position. The patch plate 23 also functions to support the header 31, so that the header 31 can be more stably disposed in the cavity.

Preferably, the manifold 31 and the support plate 22 and the patch plate 23 are adapted to be indirectly fixed by using a high temperature resistant structural adhesive to achieve a better fixing effect.

Further, referring to fig. 21, the patch plate 23 has a first end and a second end disposed opposite to each other, and a third end and a fourth end disposed opposite to each other, the four ends being four sides of the patch plate 23. Wherein a first end (lateral outer end) of the patch plate 23 is connected to the second end arm 13 of the side frame 1, a second end (lateral inner end) of the patch plate 23 is connected to an end of the heat exchanger plate 21, and at least one of a third end and a fourth end (longitudinal ends) of the patch plate 23 is connected to an adjacent support plate 22. This allows the patch plate 23 to be connected to all the peripheral members to form a single unit, thereby increasing the overall strength of the battery case.

According to some embodiments of the present invention, as shown in fig. 20 and 21, the energy absorbing structure 15 is used for absorbing energy generated by the frame body during collision, so as to effectively protect the frame body, further protect the collecting pipe 31 disposed inside the frame body, and effectively improve the impact resistance of the battery pack.

Further, the energy absorbing structure 15 is a cavity type and is located on the upper inner side of the cavity 11, so that the energy absorbing structure is more convenient to set and has a better energy absorbing effect, and the cavity 11 is effectively protected from being damaged by impact. And the weight of the frame body can be effectively reduced, and the aim of lightening the battery pack is fulfilled.

In particular, the energy-absorbing structure 15 is separated from the cavity 11 by ribs, and the cavity of the energy-absorbing structure 15 has a triangular cross-section. This results in a better stability of the energy-absorbing structure 15 and an increased energy absorption.

Referring to fig. 20 and 21, the side frame 1 further includes: the protective structure 16 is used for protecting the cavity 302 11 to prevent the external impact from damaging the cavity 11, and can effectively protect the cavity 11 and the collecting pipe 31 arranged in the cavity 11, so that the heat exchange system can operate safely and stably.

Further, the protective structure 16 includes an upper protective section 161 and an outer protective section 162, the upper protective section 161 being located above the cavity to prevent damage to the cavity 11 caused by impact from above the bezel body, and the outer protective section 162 being located outside the cavity to prevent damage to the cavity 11 caused by impact from outside the bezel body. Therefore, the protective structure 16 can protect the cavity 11 from the upper side and the outer side of the cavity 11, and further improves the safety of the cavity 11 and the safety of the collecting pipe 31 arranged inside the cavity 11.

Specifically, the upper guard section 161 and the outer guard section 162 are both hollow cavity type. Therefore, the energy absorption device is more convenient to set and has a better energy absorption effect. And the weight of the frame body can be effectively reduced, and the aim of lightening the battery pack is fulfilled.

As shown in fig. 20 and 21, the cavities of the upper protection segment 161 and the outer protection segment 162 are internally provided with reinforcing ribs 17 to divide the cavities into a plurality of parts, the reinforcing ribs 17 can reinforce the upper protection segment 161 and the outer protection segment 162 to a certain extent, so that the overall strength of the upper protection segment 161 and the outer protection segment 162 is higher, and the large cavities of the upper protection segment 161 and the outer protection segment 162 are divided into more small cavities to further improve the protection effect and the energy absorption effect of the upper protection segment 161 and the outer protection segment 162, so that the impact resistance of the frame body is better, the header 31 arranged in the frame body is effectively protected, and the whole battery pack is protected.

According to some embodiments of the present invention, as shown in fig. 8 and 19, the collecting pipe line 3 includes a collecting pipe 31 and a pipe joint 32, the collecting pipe 31 is disposed at an end of the heat exchange plate 21 and is communicated with the heat exchange cavity 211, so as to convey a heat exchange medium, which enters the collecting pipe 31 for the outside, into the heat exchange cavity 211 to realize a heat exchange function of the heat exchange plate 21. And two adjacent headers 31 are connected by pipe joints 32 to connect the headers 31 and the heat exchange plates 21 into a complete heat exchange system, i.e. a heat management system. Thereby forming a more compact overall thermal management system.

Further, every heat transfer board 21 all is equipped with a plurality of heat transfer chambeies 211 that set up side by side, and the both ends of heat transfer board 21 all are connected with pressure manifold 31, and a plurality of heat transfer chambeies 211 pass through pressure manifold 31 parallel connection, and pressure manifold 31 between two adjacent heat transfer boards 21 links to each other through coupling 32 to realize the parallel connection between the heat transfer chamber 211 of two adjacent heat transfer boards 21, from this, make all heat transfer chambeies 211 of all heat transfer boards 21 all form parallel connection and think into a complete thermal management system.

Specifically, each heat exchange plate 21 is provided with a plurality of heat exchange cavities 211 arranged in parallel, wherein a heat exchange medium flows from one end to the other end of the plurality of heat exchange plates 21 along the same direction of the plurality of heat exchange cavities 211 inside the plurality of heat exchange plates 21, that is, the plurality of heat exchange cavities 211 are arranged in parallel. Therefore, heat exchange media can flow through each heat exchange cavity 211 more uniformly, the phenomenon of local eddy current is avoided, the heat exchange effect of each part of the heat exchange plate 21 can be more balanced, and the heat exchange effect of the heat exchange plate 21 is better.

As shown in fig. 8 and 14, the pipe joint 32 is used for connecting with the collecting main 31 to communicate with the adjacent heat exchange plate 21, wherein the sealing sleeve 322 is sleeved outside the end of the connecting pipe 321, the connecting pipe 321 is used for connecting the adjacent two collecting main 31, and the sealing sleeve 322 is used for sealing the connection between the connecting pipe 321 and the collecting main 31.

Optionally, the sealing sleeve 322 may be rubber or silica gel, and the connecting tube 321 may be a metal tube or a plastic tube, which may be bonded by glue or directly injection-molded into a whole, so as to ensure the connection stability of the two and the overall setting stability of the tube joint 32. Wherein, the plastic pipe can eliminate the influence caused by the extrusion force in the lateral extrusion process to ensure the sealing performance of the connecting pipe 321, and further ensure the reliability of the pipe joint 32.

Further, referring to fig. 14 and 15, the sealing sleeve 322 is provided with a sealing structure 3221 and a first structure 3222 which are arranged at intervals along the axial direction, wherein the sealing structure 3221 is used for sealing the joint of the connecting pipe 321 and the collecting pipe 31 to realize sealing by means of interference fit. Because the interference fit mode is used, even if the coaxiality of the pipe joint 32 and the collecting pipe 31 has slight deviation after installation, the sealing effect can be ensured.

Compared with the traditional assembly mode of a clamp or a quick connector, the interference fit mode has the advantages of lower installation space requirement, simple structure, convenience in installation and relatively lower cost.

Referring to fig. 14 to 18, the first structure 3222 is used for guiding the pipe joint 32 and the collecting main 31 during the assembling process, so as to ensure that the pipe joint 32 and the collecting main 31 can be installed in a centered manner, thereby ensuring the installation accuracy and the installation accuracy, and further effectively improving the sealing performance of the connection therebetween.

Further, the first structure 3222 includes multiple segments arranged at intervals along the circumference of the sealing sleeve 322, with the multiple segments of the first structure 3222 being disposed around the sealing sleeve 322 to form gaps 32221 between adjacent segments. After the pipe joint 32 is completely installed on the collecting main 31, the sealing structure 3221 is accessible from the outside through the gap 32221. Therefore, the gap 32221 is arranged to achieve the air tightness detection function, and when the sealing structure 3221 fails to seal, air leakage will occur from the sealing structure 3221, so that an inspector can use a detection tool to pass through the gap 32221 and contact the sealing structure 3221 so as to detect the air tightness of the sealing structure 3221, and determine whether the sealing structure 3221 is intact.

With reference to the embodiment shown in fig. 14-18, the sealing sleeve 322 includes a sleeve body section 3223 and a sealing section 3224, which are axially connected, the sealing structure 3221 is disposed on the sealing section 3224 for sealing the pipe joint 32 with the collecting main 31, and the first structure 3222 is disposed on the sleeve body section 3223 for ensuring the centering installation of the two, so that the overall structure of the pipe joint 32 can be made more compact by reasonably dividing the sealing sleeve 322 into two parts to integrate structures with different functions and actions on the same sealing sleeve 322 to achieve the centralized arrangement of the structures.

Wherein the diameter of the sealing section 3224 gradually decreases from the middle to both ends. Therefore, the mounting tolerance of each part can be effectively compensated, and a better sealing effect is realized.

Further, referring to fig. 14-18, the first structure 3222 is spaced apart from the sealing section 3224 to avoid centering of the first structure 3222 from affecting the mating sealing of the sealing structure 3221 on the sealing section 3224 with the manifold 31, and to avoid the sealing structure 3221 from affecting the guiding and centering action of the first structure 3222, such that the two do not interfere with each other in terms of functionality and structure.

As shown in fig. 14 to 18, the sealing structure 3221 includes a plurality of sealing rings 32211 arranged in sequence in the axial direction, and the diameter of the sealing rings 32211 distributed in the middle is larger than that of the sealing rings 32211 distributed at both ends. Therefore, the sealing effect can be better by arranging the plurality of sealing rings 32211 to realize multi-section sealing between the pipe joint 32 and the collecting pipe 31, and the coaxiality between the parts can be effectively compensated through the arrangement of the different diameters of the sealing rings 32211, so that the installation tolerance is compensated, and the installation precision is ensured.

Further, referring to fig. 15, 17 and 18, an arc-shaped groove 32212 is disposed between two adjacent sealing rings 32211. The groove 32212 is provided to reserve a space for compression of the sealing ring 32211, so that the sealing ring 32211 can be sufficiently compressed when being pressed against the inner wall of the collecting pipe 31, and further, the sealing ring 32211 can be attached to the inner wall of the collecting pipe 31 more tightly, and a better sealing effect is achieved.

With reference to the embodiment shown in fig. 14 and 15, the first structure 3222 has a greater thickness in the axial direction than the sealing ring 32211. Since the first structure 3222 is guided to engage with the inner wall of the collecting main 31 for centering thereof, the first structure 3222 is provided with a relatively large strength, and therefore the thickness of the first structure 3222 is provided with a relatively large sealing ring 32211.

As shown in fig. 14 and 15, the sealing sleeve 322 is further provided with an axial limiting flange 3225, the axial limiting flange 3225 may play a role in limiting during the assembling process and the using process of the pipe joint 32 and the collecting main 31, and after the assembling process is completed, the axial limiting flange 3225 is adapted to abut against the outer end wall of the collecting main 31 to play a role in limiting, so as to ensure that the pipe joint 32 is always in a good sealing state.

Specifically, the sealing structure 3221, the first structure 3222, and the axial position-defining flange 3225 are axially spaced inwardly from the end of the sealing sleeve 322 to avoid structural and functional interference therebetween. The axial position-limiting flange 3225 is configured to press against an end surface of a pipeline (the header 31) to be connected, and an arc degree of the axial position-limiting flange 3225 is smaller than 270 ° to form a through hole, so that at least a portion of the gap 32221 can be aligned with a region (through hole) where the axial position-limiting flange 3225 is not located, so that an inspector can sequentially pass through the axial position-limiting flange 3225 and the first structure 3222 to perform a tightness test on the sealing structure 3221 by using a testing tool.

According to other embodiments of the present invention, as shown in fig. 16 to 18, an end portion of the connection pipe 321 is recessed inwardly to form a mounting groove 3211, and the sealing sleeve 322 is fitted into the mounting groove 3211 to achieve a stable installation. Wherein, the sealing sleeve 322 can adopt the EPDM material to mould plastics in mounting groove 3211 in an organic whole to realize the stable connection of the two. The condition that the seal cover 322 neglected loading and lost in the transportation process can be avoided appearing through with the two integrative injection moulding, the phenomenon that the pine takes off can not appear in the vibration process yet, the probability of appearing leaking is also very little.

Moreover, the sealing structure 3221 and the first structure 3222 protrude from the mounting groove 3211 so as to be in abutting engagement with the inner wall of the collecting main 31, thereby achieving a stable sealing effect.

Further, in connection with the embodiment shown in fig. 16-18, the connecting tube 321 is provided with an axial position-limiting flange 3225. That is, the axial position-limiting flange 3225 is directly formed on the outer circumferential surface of the connection pipe 321 to ensure the stability of the arrangement of the axial position-limiting flange 3225. The axial position-limiting flange 3225 can play a position-limiting role in the assembling process and the using process of the pipe joint 32 and the collecting pipe 31, and after the assembling is completed, the axial position-limiting flange 3225 is suitable for being abutted against the outer end wall of the collecting pipe 31 to play a position-limiting role, so that the pipe joint 32 is always in a good sealing state.

The sealing structure 3221, the first structure 3222, and the axial position-limiting flange 3225 are axially spaced inward from the end of the connecting pipe 321 to avoid mutual structural and functional interference therebetween. And the axial position-limiting flange 3225 is used for pressing against the end surface of the pipeline (the collecting pipe 31) to be connected, and the radian of the axial position-limiting flange 3225 is smaller than 270 degrees to form a through hole, so that at least part of the gap 32221 can be directly opposite to the area (through hole) where the axial position-limiting flange 3225 is not arranged, and a detection tool can be used by a detection person to sequentially pass through the axial position-limiting flange 3225 and the first structure 3222 to perform tightness detection on the sealing structure 3221.

Referring to fig. 8 and 19, the heat exchange plate 21 is provided with heat exchange cavities 211 for circulating a cooling fluid to exchange heat with the battery modules 9 disposed on the heat exchange plate 21, the open ends of the heat exchange cavities 211 are connected with the collecting pipes 31, and the collecting pipes 31 are adapted to divide the cooling fluid entering the battery pack 100 from the outside to be evenly distributed in the heat exchange cavities 211. Two ends of the connecting pipe 321 are respectively sleeved with a sealing sleeve 322 (refer to fig. 14 and 16), and the two collecting pipes 31 are connected through a pipe joint 32, so as to realize series connection of the plurality of collecting pipes 31 and parallel connection of the plurality of heat exchange cavities 211 (refer to fig. 8 and 19).

As shown in fig. 8, specifically, the collecting pipe 31 is sleeved outside the sealing sleeve 322 to achieve stable sealing connection between the two, and the connection distance between the two can be shortened, so that the overall structure of the heat exchange system of the battery pack 100 is more compact.

According to some embodiments of the present invention, further, in combination with the embodiments shown in fig. 11 to 13, in order to enable the flow rate of the heat exchange medium in each heat exchange cavity 211 to be distributed evenly and reasonably, the embodiment of the present invention provides the flow rate distribution component 4, and the flow rate distribution component 4 is blocked at the open end of the heat exchange cavity 211 to achieve the effect of even flow distribution.

Wherein the flow distribution member 4 has an orifice 41 communicating with the heat exchange chamber 211. Specifically, the heat exchange medium in the header 31 needs to flow into the heat exchange cavity 211 through the throttle hole 41, so that reasonable flow distribution and throttling can be realized by changing the aperture and the number of the throttle holes 41 corresponding to the heat exchange cavities 211 at different positions, so that the flow rates of the heat exchange medium flowing into each heat exchange cavity 211 can be equal.

As shown in fig. 13, the collecting pipe 31 is connected to the heat exchange plate 21 so that the flow distribution component 4 can be stably clamped between the collecting pipe 31 and the heat exchange plate 21 to achieve a stable flow equalization effect.

Referring to fig. 11, the heat exchange plate 21 is provided with a plurality of heat exchange cavities 211 longitudinally penetrating to realize circulation and heat exchange of a heat exchange medium, the flow distribution component 4 is provided with a plurality of sets of throttle holes 41, the plurality of heat exchange cavities 211 correspond to the plurality of sets of throttle holes 41 one to one, and the plurality of heat exchange cavities 211 are connected in parallel through a plurality of branch holes 312 of the header 31. Therefore, the purpose of supplying liquid to a plurality of heat exchange cavities 211 by using the same collecting pipe 31 is achieved, and each heat exchange cavity 211 can be arranged in parallel.

In short, the heat exchange medium flows to the other end of the heat exchange cavity 211 from the same end of the heat exchange cavities 211, so that the heat exchange is more balanced, the phenomenon of local eddy current is avoided, the normal heat exchange of the heat exchange plate 21 is influenced, and the heat exchange effect of the heat exchange plate 21 is better.

As shown in fig. 11 to 13, the flow distributing member 4 is plate-shaped, and as the name suggests, the flow distributing member 4 is a thin member so as to be interposed between the header 31 and the heat exchange plate 21, wherein the orifice 41 penetrates the flow distributing member 4 in the thickness direction of the flow distributing member 4 so that the orifice 41 can be aligned with the branch hole 312 and the heat exchange cavity 211 after the flow distributing member 4 is interposed between the header 31 and the heat exchange plate 21, thereby enabling the orifice 41 to achieve an effective throttling action.

Referring to fig. 13, the header 31 has a main flow cavity 311 and a plurality of branch holes 312 communicated with the main flow cavity 311, the plurality of branch holes 312 are disposed opposite to the plurality of throttle holes 41, and each heat exchange cavity 211 is communicated with at least one branch hole 312, so that the heat exchange medium in the header 31 can be divided by the branch holes 312 to flow to the flow distribution component 4, and is evenly divided into each heat exchange cavity 211 by the flow equalizing effect of the throttle holes 41, so as to realize the balanced heat exchange of the heat exchange plate 21.

According to some embodiments of the invention, the flow distributing element 4 regulates the flow by regulating the number and/or the position and/or the aperture of the orifices 41. Therefore, different flow distribution components 4 need to be designed for the plurality of heat exchange plates 21 to meet the purpose of balanced flow distribution of the plurality of heat exchange plates 21, so that the flow of the heat exchange medium in each heat exchange cavity 211 can be equal, and a more balanced heat exchange effect can be achieved.

Referring to fig. 11, in order to achieve an effective throttling effect of the throttle hole 41, the embodiment of the present invention sets the flow area of the throttle hole 41 to be smaller than the flow area of the open end of the heat exchange cavity 211, so as to achieve an unnecessary throttling effect by changing the size of the hole of the throttle hole 41.

The flow area of the orifices 41 located at both ends of the flow rate distributing member 4 is larger than the flow area of the orifice 41 located at the middle. When the heat exchange medium flows through the same header 31, the closer the liquid pressure to the end of the header 31, the smaller the flow rate of the heat exchange medium. On the contrary, the liquid pressure in the middle of the collecting pipe 31 is the largest, the flow rate of the cooling liquid is the largest, so that the flow areas of the orifices 41 at the two ends of the flow distribution part 4 are larger than the flow area of the orifice 41 in the middle, a reasonable throttling effect is realized, and after the throttling effect of the different orifices 41 on the flow distribution part 4 is achieved, the flow rate of the heat exchange medium in each heat exchange cavity 211 can be balanced, and the problems of performance and service life of the battery module 9 caused by the uneven temperature of the heat exchange plate 21 are effectively solved.

As shown in fig. 11 and 12, the multiple sets of orifices 41 of the flow distribution component 4 include end orifices 411 disposed at two ends and a middle orifice 412 disposed in the middle, the end orifices 411 correspond to the heat exchange cavities 211 at two ends of the heat exchange plate 21, the middle orifice 412 corresponds to the other heat exchange cavities 211 of the heat exchange plate 21, the number of orifices 41 of each set of end orifices 411 is less than the number of orifices 41 of each set of middle orifices 412, so as to match the above-mentioned large flow area of the end orifices 411 and the small flow area of the middle orifices 412, so that the flow rates of the heat exchange media input to the heat exchange cavities 211 from the orifices 41 can be equal, and further, the purpose of uniform heat exchange of the heat exchange plate 21 is achieved.

In connection with the embodiments shown in fig. 8 and 12, at least one header 31 of the plurality of heat exchanger plate 21 assemblies has a connection port 313 (water inlet end) for communicating with an external water circuit, and the total flow area of all the orifices 41 in the flow distribution member 4 increases as the distance from the flow distribution member 4 to the connection port 313 increases (three sets of flow distribution members 4 in fig. 12 are respectively arranged sequentially away from the connection port 313 from the top to the bottom).

In other words, one header 31 of the plurality of heat exchange plate 21 stacks has the connection port 313 for communicating with the external water passage, and the flow area of the orifice 41 of the plurality of flow rate distribution members 4 has a positive correlation with the distance from the flow rate distribution member 4 to the connection port 313.

Since the hydraulic pressure of the heat exchange medium in the heat exchange system is continuously reduced along the flow direction of the heat exchange medium, the hydraulic pressure at a position close to the total inlet (the connection port 313) of the heat exchange system is higher, and the flow rate of the heat exchange medium is also higher, so that in order to adjust the uniformity of the flow rates of the heat exchange plates 21, the flow areas of the orifices 41 on the flow distribution members 4 corresponding to the heat exchange plates 21 close to the connection port 313 are minimized, and then the flow areas of the orifices 41 on the flow distribution members 4 corresponding to the heat exchange plates 21 at the downstream are sequentially larger than the flow areas of the orifices 41 on the flow distribution members 4 corresponding to the heat exchange plates 21 at the upstream along the flow direction of the heat exchange medium.

Therefore, the uniformity of the flow distribution of the heat exchange plates 21 in the heat exchange system of the battery pack 100 is realized, and the problems of system performance and service life caused by uneven temperature of the heat exchange plates 21 are effectively solved.

In summary, the flow distribution component 4 is added between the heat exchange plates 21 and the collecting pipe 31 in this patent, so as to effectively realize the unification of the flows of the heat exchange plates 21. Wherein, each heat exchange plate 21 is identical with coupling 32 completely, all can be general, only need to change the arrangement condition of orifice 41 on the flow distribution part 4 can, be favorable to material management, reduce later maintenance cost, can both effectively raise the efficiency, can effectively reduce cost in each stage such as design, manufacturing, assembly, after-sales.

As shown in fig. 13, the heat exchange cavity 211 is open at the end of the heat exchange plate 21, the end of the heat exchange plate 21 is provided with a boss 212 extending outward, and the heat exchange cavity 211 penetrates through the boss 212 to facilitate the communication between the heat exchange cavity 211 and the throttle hole 41 and the branch hole 312.

Further, the flow distributing component 4 is installed on the end face of the boss 212 to realize the attachment of the throttle hole 41 to the heat exchange cavity 211, the collecting pipe 31 has a lap edge 314 protruding outwards, and the lap edge 314 is connected with the side face of the boss 212 to realize the stable connection of the collecting pipe 31 and the heat exchange plate 21.

Preferably, the outer contour of the cross section of the boss 212 is the same as the outer contour of the cross section of the flow distribution member 4, so that the overlapping edge 314 can be fixed to the boss 212 and fixed to the side of the flow distribution member 4, and the flow distribution member 4 can be clamped between the boss 212 and the header 31 more stably, so as to avoid the flow distribution member 4 from shaking to affect the communication between the branch hole 312, the throttle hole 41 and the heat exchange cavity 211.

As a preferred embodiment, referring to fig. 13, the at least two overlapping edges 314 are oppositely disposed, and the two overlapping edges 314 are respectively connected to two side surfaces (upper surface and lower surface) of the boss 212 to clamp the boss 212 between the two overlapping edges 314, so that the boss 212 can be more stably clamped and fixed between the two overlapping edges 314, thereby achieving stable connection between the header pipe 31 and the heat exchange plate 21.

And, the stepped surface 72 between the boss 212 and the side surface of the heat exchange plate 21 and the end of the overlapping edge 314 are provided with welding grooves for welding fixation. Preferably, the overlapping edge 314 is connected to the heat exchanger plate 21 by laser welding. The mode of adopting laser welding can guarantee that the welded welding seam can not interfere with other parts, and the welding structure has wide application range, high welding strength, stable welding process and products

In connection with the embodiments shown in fig. 5-7, the heat exchanger plate 21 and the support plate 22 are connected by means of a plug-in connection. Thereby, the assembly of the heat exchange plate 21 and the support plate 22 can be made simpler and more convenient. The conventional welding process and the arrangement of separate fixing members can be effectively avoided, and the overall cost of the battery pack 100 can be reduced.

Moreover, the mode of splicing connection is adopted, so that the flatness of the heat exchange plate 21 after being connected with the support plate 22 can be further conveniently ensured, the support plate 22 and the heat exchange plate 21 can better fix and support the battery module 9, and the heat exchange plate 21 can be ensured to be stably tightly attached to the battery module 9, so that the heat exchange effect is ensured.

As shown in fig. 5 to 7, the insertion structure includes: an insertion groove 7 and an insertion boss 8. Optionally, a first one of the heat exchange plate 21 and the support plate 22 is provided with an insertion groove 7, a second one of the heat exchange plate 21 and the support plate 22 is provided with an insertion boss 8, and the insertion boss 8 is inserted into the insertion groove 7. In other words, the heat exchanging plate 21 may be provided with the inserting groove 7, and the corresponding support plate 22 is provided with the inserting boss 8. Or the heat exchange plate 21 is provided with the inserting boss 8, the corresponding support plate 22 is provided with the inserting groove 7, and the inserting matching of the heat exchange plate 21 and the support plate 22 can be realized by the two forms.

In a preferred embodiment, the end face of the plug-in boss 8 is glued to the bottom wall of the plug-in groove 7. Thus, the mounting and fixing process can be made simpler, and the use of a separate fastener for fastening the two can also be avoided, whereby the manufacturing cost can be reduced.

Of course, the insertion boss 8 and the insertion groove 7 may be connected and fixed in an interference fit manner.

Further, as shown in fig. 5, a guide surface 81 is arranged between the end surface of the insertion boss 8 and the side surface of the insertion boss 8, and the guide surface 81 plays a role in guiding the insertion and matching process of the two, so that the insertion boss 8 can be more conveniently and accurately installed in the insertion groove 7 to complete the connection and fixation of the two.

According to some embodiments of the present invention, referring to fig. 5, the insertion groove 7 is opened in a horizontal direction, and the insertion boss 8 is protruded in the horizontal direction. Specifically, the upper surface of the insertion boss 8 is recessed with respect to the upper surface of the second of the heat exchange plate 21 and the support plate 22, and the lower surface of the insertion boss 8 is recessed with respect to the lower surface of the second of the heat exchange plate 21 and the support plate 22, so that the upper and lower surfaces of the heat exchange plate 21 and the support plate 22 are flush.

Thus, the insertion installation process can be facilitated, and the support plate 22 and the heat exchange plate 21 can be provided relatively thin to reduce the overall weight of the battery pack 100.

As shown in fig. 5, the plug grooves 7 are provided at the side of a first one of the heat exchanger plates 21 and the support plates 22, and the plug bosses 8 are provided at the side of a second one of the heat exchanger plates 21 and the support plates 22. Because the heat exchange plate 21 and the support plate 22 are fixed in an inserted manner along the horizontal direction, the insertion grooves 7 and/or the insertion bosses 8 are arranged at two ends of the heat exchange plate 21 and/or the support plate 22 so as to facilitate the insertion in the horizontal direction, and the whole structure of the heat exchange plate 21 and the support plate 22 after the insertion is more compact.

According to other embodiments of the present invention, referring to fig. 6 and 7, the insertion groove 7 is opened in the vertical direction, and the insertion boss 8 is protruded in the vertical direction. In other words, the support plate 22 is fixed to the heat exchange plate 21 by inserting in the vertical direction.

Further, the upper surface of the first one (one of) the support plate 22 and the heat exchanger plate 21 is provided with a sunken support surface 71, and the plug groove 7 is provided with the support surface 71. The second (other) of the support plate 22 and the heat exchanger plate 21 is provided with an edge plate 82 extending in the horizontal direction, the lower surface of the edge plate 82 is provided with a downwardly protruding insertion boss 8, and the edge plate 82 is supported on the support surface 71.

Thereby, a stable supporting connection is achieved both in the transverse direction as well as in the longitudinal direction. That is, the longitudinal insertion of the insertion boss 8 and the insertion groove 7 realizes the transverse limit connection between the heat exchange plate 21 and the support plate 22, and the mutual support of the support surface 71 and the side plate 82 realizes the longitudinal limit between the heat exchange plate 21 and the support plate 22, so that the heat exchange plate 21 and the support plate 22 can be connected more stably.

According to some embodiments of the present invention, the upper surface of the first (one of) support plate 22 and heat exchanger plate 21 is connected to support surface 71 by stepped surface 72, stepped surface 72 is at an obtuse angle to support surface 71, and the upper surface of edge plate 82 is at an acute angle to the side of edge plate 82. From this, realized the relative parallel arrangement of side and the ladder face 72 of sideboard 82 to the concatenation of the two can be located the coplanar with the upper surface of heat transfer plate 21 and backup pad 22, so that support battery module 9 on heat transfer plate 21 and backup pad 22 everywhere can the atress more even, and then guaranteed battery module 9's installation stability.

Moreover, the heat exchange plate 21 can be tightly attached to the battery module 9 at each position, so that the overall heat exchange effect is ensured.

As shown in fig. 7, the stepped surface 72 is disposed parallel to and spaced apart from the side surface of the side plate 82, and the side surface of the support plate 22 is also disposed spaced apart from the side surface of the heat exchange plate 21. The two spaces are designed allowance to prevent the occurrence of assembling interference, so that the assembling, reliability and stability of the heat exchange plate 21 and the support plate 22 are ensured.

Optionally, the insertion groove 7 and the insertion boss 8 are fixed in an interference fit manner, or the insertion groove 7 and the insertion boss 8 are welded and connected through cold pressure welding, and then or the insertion groove 7 and the insertion boss 8 are fixed through adhesion. The three fixing forms can be reasonably selected according to the specific arrangement conditions of the heat exchange plate 21 and the support plate 22 in the battery pack 100, so as to achieve a better fixing effect.

As shown in fig. 10, a bottom protection plate 301 is disposed below the bottom plate, a protection cavity 302 is defined between an upper surface of the bottom protection plate 301 and a lower surface of the bottom plate, and the protection cavity 302 is filled with the buffer filler 106. The bottom protection plate 301 plays a role of protecting the bottom plate so as to prevent the bottom plate from being damaged by impact from the lower side of the battery pack 100, and the protection cavity 302 and the buffer filler 106 arranged in the protection cavity have a certain energy absorption and buffering function, so that the protection effect can be further played.

Further, the lower surface of the heat exchange plate 21 is provided with a first support leg 213, and the first support leg is supported between the heat exchange plate 21 and the bottom protection plate 301 and is fixedly connected with the bottom protection plate 301, so as to play a role of supporting and reinforcing, so that the bottom protection plate 301 and the floor are connected into a whole, and further, the overall strength of the battery pack 100 is higher. The first support leg 213 and the heat exchange cavity 211 are staggered to prevent the first support leg 213 from compressing the heat exchange cavity 211 when the battery pack 100 is impacted, so as to effectively protect the heat exchange cavity 211.

Still further, the support plate 22 is provided with a weight reduction cavity 221 and a second leg 222, the weight reduction cavity 221 can realize effective weight reduction of the support plate 22, the second leg 222 is connected with the lower surface of the support plate 22, the second leg 222 is supported between the support plate 22 and the bottom protection plate 301 and is fixedly connected with the bottom protection plate 301 so as to play a role in supporting and reinforcing, the bottom protection plate 301 and the floor are connected into a whole, and further the overall strength of the battery pack 100 is higher. The second leg 222 and the weight-reducing cavity 221 are arranged in a staggered manner, so that the second leg 222 is prevented from being compressed into the weight-reducing cavity 221 by impact at the lower part of the battery pack 100, and the weight-reducing cavity 221 is effectively protected.

With reference to the embodiment shown in fig. 1-4, the battery module 9 is located above the heat exchange plate 21 and spans between two adjacent supporting plates 22, and two ends of the battery module 9 are respectively mounted on the supporting plates 22, so that the battery module 9 can span the heat exchange plate 21 and can be closely attached to the heat exchange plate 21, thereby achieving effective heat exchange.

According to some embodiments of the present invention, a plurality of heat conducting silicone gels (not shown) are sandwiched between the battery module 9 and the heat exchange plate 21. Specifically, heat conduction silica gel is liquid heat conduction silica gel, sets up heat conduction silica gel between battery module 9 and heat transfer board 21 and has following advantage: firstly, the heat exchange plate 21 can play a role of an intermediate bridge, namely the heat exchange plate is indirectly contacted with the battery module 9, and liquid heat-conducting silica gel is arranged in the middle of the heat exchange plate, so that the heat exchange plate not only plays a role of transferring energy, but also plays a role of supporting the battery module 9; secondly, the heat exchanger has the functions of high temperature resistance and corrosion resistance, has good ductility, and can be fully contacted with the surface of the battery module 9, so that the heat exchange at each part of the battery module 9 is more uniform; the third, it is convenient succinct to set up, compares with traditional heat conduction silica gel pad, and liquid heat conduction silica gel can adjust the quantity according to the demand, does not need the manual work to tailor, more does not need to paste by a large scale, only needs a certain amount just can be covered with whole space, effective material saving and usage space.

From this, through set up a liquid heat conduction silica gel that has heat conduction and supporting role between battery module 9 and heat transfer board 21, can effectively solve the insufficient problem of solid heat conduction silica gel pad and the contact of battery module 9 bottom, can adjust the position and the thickness that liquid glued simultaneously according to actual demand, easy to operate.

According to some embodiments of the present invention, as shown in fig. 23-27, a sealing strip 1014 is disposed between the cover panel and the side frame 11, and the sealing strip 1014 is reasonably kept away from a connecting structure 1025 for connecting the cover panel and the side frame 11, so that the sealing strip 1014 can be ensured to be in a reasonable compression space, and a minimum sealing section can be ensured.

As shown in fig. 23, the battery case according to the embodiment of the present invention includes: side panels 82 and cover panels.

The cover plate is attached to the end of the side frame 1, wherein the upper and lower ends of the side frame 1 are opened, so that the cover plate can be attached to the upper end of the side frame 1 or the cover plate can be attached to the lower end of the side frame 1. As shown in fig. 25, the cover plate includes an upper cover plate 10 and a bottom cover plate 301, the upper cover plate 10 is mounted on the upper end of the side frame 1, and as shown in fig. 26 and 27, the bottom cover plate 301 is mounted on the lower end of the side frame 1. From this, install upper cover plate 10, end backplate 301 respectively in the upper and lower both ends of side frame 1 after, the installation cavity is injectd to upper cover plate 10, end backplate 301 and side frame 1, and battery module 9 can be installed in this installation cavity, and upper cover plate 10, end backplate 301 and side frame 1 can play fine guard action to battery module 9 to make battery module 9 have stable operational environment.

Wherein, upper cover plate 10, end backplate 301 can be dismantled with side frame 1 is nimble, like this, when battery module 9 trouble, can break apart upper cover plate 10, end backplate 301 and side frame 1, maintain or change battery module 9 again. The upper cover plate 10, the bottom protection plate 301 and the side frame 1 can be made of aluminum alloy materials, the aluminum alloy materials are light in weight, the overall weight of the battery box body can be reduced, meanwhile, the impact force outside the battery box body can be absorbed, and the safety inside the battery is guaranteed.

The cover plate and the side frame 1 are provided with the sealing strip 101 in a supporting clamp mode, the sealing strip 101 can enable the space between the cover plate and the side frame 1 to be effectively sealed, so that the internal space of the battery box body is sealed, and the battery module 9 is prevented from being interfered by external environment in the installation cavity. The side frame 1 is a polygonal annular structure, and the sealing strip 101 with the polygonal annular structure is arranged at the joint of the cover plate and the side frame 1, so that each position along the connecting direction of the cover plate and the side frame 1 can be effectively sealed, and the sealing performance and the safety of the battery box body are improved.

As shown in fig. 23, a sealing strip 101 is provided between the upper cover plate 10 and the side frame 1 to effectively seal the joint between the upper cover plate 10 and the side frame 1, and as shown in fig. 26 and 27, a sealing strip 101 is provided between the bottom protective plate 301 and the side frame 1 to effectively seal the joint between the bottom protective plate 301 and the side frame 1, so that the sealing property of the battery case and the safety of the internal environment can be improved.

Sealing strip 101 has dodge section 1011, dodge section 1011 incurs, as shown in fig. 24, dodge section 1011 and be crooked towards the direction that is close to the installation cavity inboard, link to each other through connection structure 102 between apron and the side frame 1, connection structure 102 is located dodge section 1011's the outside, and connection structure 102 is spaced apart from sealing strip 101, thus, when will apron and side frame 1 fixed connection through connection structure 102, sealing strip 101 can dodge connection structure 102 effectively, guarantee that the two can assemble effectively when realizing sealed, and as shown in fig. 26, at least part of sealing strip 101 is around connection structure 102 sets up, sealing strip 101 sets up along being located the regional setting that connection structure 102 is nearer promptly.

As shown in fig. 24, the avoiding section 1011 is an arc shape, and if the avoiding section 1011 is an arc shape, the distance between each position of the avoiding section 1011 and the connecting structure 102 is more uniform, so that each position of the avoiding section 1011 can keep a reasonable distance from the connecting structure 102, interference to the assembling process of the connecting structure 102 is avoided, and the rationality of the structural design of the sealing strip 101 is improved.

From this, when fastening apron and side frame 1 through connection structure 102, connection structure 102 can make apron, side frame 1 closely laminate with sealing strip 101 to the extrusion force that apron, side frame 1 produced, strengthens the extrusion effect of apron, side frame 1 to sealing strip 101, improves the leakproofness of battery box, simple structure, simple to operate. The number of the connecting structures 102 is multiple, the cover plate and the side frame 1 are connected at multiple positions by the connecting structures 102, as shown in fig. 25, the periphery of the cover plate is connected with the side frame 1 through the connecting structures 102, the middle of the cover plate is connected with the reinforcing beam of the battery box body through the connecting structures 102, and the connecting stability of the cover plate and the side frame 1 is improved.

Like this, the accessible is carried out reasonable arrangement to sealing strip 101, connection structure 102 position, through to the apron, the stamping depth of side frame 1, controls the compression volume of sealing strip 101, guarantees that sealing strip 101 is in reasonable compression space to make apron and side frame 1 sealed reliably.

Wherein, connection structure 102 can be self-tapping screw or flow and bore the screw, as shown in fig. 26, the apron has the via hole, and side frame 1 has the screw hole, can run through connection structure 102 hole and screw hole threaded connection to make apron and side frame 1 link to each other, and connection structure 102 dismantles conveniently, and assembly efficiency is high, guarantees apron and side frame 1 stable connection. The use of bolts and blind rivet nuts is avoided, the weight is reduced, the use of system energy density is facilitated, the connecting structure 102 can be produced fully automatically, pre-drilling is avoided for battery box profiles, the installation of manual blind rivet nut columns is avoided, the installation of cover plate bolts is avoided, the quality is controllable, and the efficiency is improved.

Connecting structure 102 only needs the trompil in advance when linking to each other apron and lateral wall frame, reduces the use of embedding swivel nut, and reduce cost, the proof mass, to the special tooth form design of aluminium alloy, chipless self tapping extrusion screw thread shaping effectively guarantees fastening strength, reaches the balance of bolt material and aluminium alloy material, reduces the use of process embedding swivel nut, simplifies the assembly step, and is simple and practical.

In some embodiments, the cover plate is provided with a sealing groove 103, the sealing groove 103 is recessed towards a direction away from the side wall frame, as shown in fig. 23, 26 and 27, the sealing groove 103 is provided on a side of the cover plate facing the side frame 1, after the cover plate is assembled with the side frame 1, the sealing groove 103 forms a closed cavity 11, and the sealing strip 101 is provided in the sealing groove 103 to form a stable sealing structure 3221 between the cover plate and the side frame 1, so as to ensure that the battery box body is effectively sealed.

Wherein, sealing strip 101 is foaming silica gel, after the assembly of apron and side frame 1 is accomplished promptly, apron and side frame 1 form confined foaming chamber in seal groove 103 department, and then pour into foaming material into in the seal groove 103 and form sealing strip 101, and the injection volume of steerable foaming material so that the space between apron and the side frame 1 is filled completely, and avoid the too big damage connection structure 102 of injection volume, improve the leakproofness of apron and side frame 1 and guarantee connection structure 102's security simultaneously, and the application of silica gel foaming technique, full automated production, personnel's input has been reduced, the bad risk of ordinary double faced adhesive tape pasting has been reduced, greatly reduced material cost, furthest reduces the width of sealed flange face, reduce weight, optimize the structure.

The sealing groove 103 comprises an avoiding groove section 1032, the avoiding groove section 1032 is bent inwards, the avoiding section 1011 is arranged on the avoiding groove section 1032, the avoiding groove section 1032 is spaced apart from the connecting structure 102, so that when the cover plate is connected with the side frame 1 through the connecting structure 102, the avoiding groove section 1032 can reasonably avoid the connecting structure 102, and the cover plate and the side frame 1 are reasonably assembled.

As shown in fig. 25, the seal groove 103 includes a plurality of linear groove sections 1031 and avoidance groove sections 1032, and the plurality of avoiding groove sections 1032 are arranged in a staggered manner with the plurality of linear groove sections 1031, and the plurality of avoiding groove sections 1032 are connected with the plurality of linear groove sections 1031 in sequence, namely, an avoiding groove section 1032 is arranged between two adjacent straight line groove sections 1031, a straight line groove section 1031 is arranged between two adjacent avoiding groove sections 1032, wherein, the straight line groove section 1031 extends along the edge of the cover plate, the avoiding groove section 1032 sinks towards the inner side of the straight line groove section 1031, the outer side of the avoiding groove section 1032 is provided with the connecting structure 102, wherein, the periphery of the cover plate is connected with the side frame 1 through a plurality of connecting structures 102 respectively, and a plurality of avoiding groove sections 1032 are arranged corresponding to the connecting structures 102 one by one, in this way, the cover plate and the side frame 1 can be connected by the connecting structure 102 at a plurality of positions, and each position has better sealing performance.

As shown in fig. 24, at least a portion of the connection structure 102 is disposed opposite to the linear slot section 1031 along the extending direction of the linear slot section 1031, and as shown in the figure, at least a portion of the connection structure 102 is located in the avoiding slot section 1032, so that, after the installation of the cover plate and the side frame 1 is completed, the connection structure 102 and the sealing groove 103 occupy less space along the direction perpendicular to the linear slot section 1031 as a whole, that is, the structural arrangement perpendicular to the linear slot section 1031 direction is more compact, thereby saving the installation space of the whole battery box, improving the space utilization rate, and facilitating the overall layout.

In some embodiments, the sealing groove 103 has an arc-shaped cross section, as shown in fig. 23, 24 and 26, the cross section of the sealing groove 103 is arc-shaped, that is, the sealing groove 103 has a smooth inner wall surface, so that in the foaming process of the sealing strip 101, the foaming material can completely adhere to the inner wall surface of the sealing groove 103, thereby ensuring effective sealing between the sealing strip 101 and the cover plate, avoiding the inner wall surface of the sealing groove 103 having a pit or a dead angle, preventing a gap from occurring between the sealing strip 101 and the cover plate, and improving the sealing performance between the cover plate and the side frame 1.

As shown in fig. 23, the edge of the upper cover plate 10 is provided with a turned-over edge 104, the turned-over edge 104 is turned over downward, the upper cover plate 10 is attached to the top wall of the side frame 1, and the turned-over edge 104 extends out of the side frame 1, as shown in the figure, the turned-over edge 104 extends in a direction away from the sealing strip 101, and is turned over toward one side close to the side frame 1, and as shown in the figure, the turned-over edge 104 shields the joint of the side frame 1 and the cover plate from top to bottom, the turned-over edge 104 can play a role in protecting the connecting structure 102, so that the connecting structure 102 of the cover plate and the side frame 1 is more stable, external sundries are avoided, the equipment damages the connecting structure 102, and the stability and the safety of the battery box are improved.

The thickness of the outer end of the top wall of the side frame 1 becomes thicker gradually from outside to inside, and the connecting structure 102 between the upper cover plate 10 and the side frame 1 runs through the outer end of the top wall of the side frame 1, as shown in fig. 23, the thickness of the part of the top wall of the side frame 1, which is far away from the sealing strip 101, is greater than the part close to the sealing strip 101, the outer end of the upper cover plate 10 is provided with a through hole, the outer end of the side frame 1 is provided with a threaded hole, the connecting structure 102 runs through the through hole and is in threaded connection with the threaded hole, so that the outer end of the upper cover plate 10 is connected with the outer end of the side frame 1, and further the upper cover plate 10 is connected with the side frame 1 into a whole, as shown in fig. 26, the thread stroke of the threaded hole becomes longer gradually from outside to inside, namely, the matching length of the inner side of the threaded hole and the connecting structure 102 is greater, and the connecting stability of the cover plate and the side frame 1 is improved.

As shown in fig. 26 and 27, the lower surface of the side frame 1 is provided with a protection boss 105, the protection boss 105 protrudes downwards, the protection boss 105 is located on the outer side of the bottom protection plate 301, as shown in fig. 26 and 27, the protection boss 105 is located on one side of the connecting structure 102 deviating from the sealing strip 101, the protection boss 105 is right opposite to the connecting structure 102 along the inner and outer directions, thus, the protection boss 105 can shield the connecting structure 102, further, the equipment on the outer side is prevented from damaging the connecting structure 102, the safety of the connecting structure 102 is improved, and the reasonability and the safety of the structural design of the side frame 1 are improved.

As shown in fig. 27, the battery case further includes: a floor assembly 2.

The bottom plate assembly 2 is used for reducing impact from the bottom of the battery box body so as to protect the battery module 9 in the battery box body, the bottom plate assembly 2 is connected with the side frame 1, the bottom protection plate 301 is located below the bottom plate assembly 2, the bottom protection plate 301 is spaced from the bottom plate assembly 2, the buffer filler 106 is clamped between the bottom protection plate 301 and the bottom plate assembly 2, and the buffer filler 106 is used for absorbing impact force and vibration energy from the bottom protection plate 301.

Therefore, the bottom protection plate 301, the buffer filler 106 and the bottom plate assembly 2 are sequentially arranged at the bottom of the battery box body from bottom to top, and the buffer filler 106 can be reasonably deformed after being subjected to excessive pressure. Thus, the buffer filler 106 can absorb the impact energy at the bottom of the battery box body through deformation, relieve the bottom pressure, achieve the purpose of protecting the battery, and improve the stability and the safety of the internal environment of the battery box body.

As shown in fig. 27, the buffer filler 106 includes: an energy absorbing layer 1061 and a foam layer 1062.

The energy absorbing layer 1061 is adhered to the upper surface of the bottom protection plate 301 through an adhesive, the energy absorbing layer 1061 is made of a foamed aluminum material, the foam layer 1062 is disposed on the upper surface of the energy absorbing layer 1061, the foam layer 1062 is pressed against the lower surface of the bottom plate assembly 2, as shown in fig. 27, a foam plate 1063 is further disposed between the energy absorbing layer 1061 and the foam layer 1062, a foam cavity is formed between the foam plate 1063 and the bottom plate assembly 2 for foam molding of the foam layer 1062, and the foam plate 1063 is an aluminum plate.

Therefore, the foam layer 1062 is compressed when the connecting structure 102 fixes the bottom guard plate 301 and the side frame 1, so as to form an effective waterproof and dustproof structure, protect the bottom of the battery clean and ensure the safety of the electric appliance. The energy absorption layer 1061 absorbs energy when the bottom of the battery is impacted, the foam layer 1062 can eliminate the whole tolerance, and can play a first buffer role in impact to slow down the impact force, and then the extruded section begins to deform and absorb energy to slow down the pressure from the bottom, so that the purpose of protecting the battery is finally achieved.

The bottom guard plate 301 is stamped by an aluminum plate, so that the weight is light, the energy absorption effect is achieved, the energy absorption of the buffer filler 106 is realized in a weak link of the box body, the uniform section can be arranged according to positions, and the standardization degree is high. The periphery of the bottom protection plate 301 can form sealing with the battery box body, so that the sealing performance of the bottom of the box body is guaranteed, and the safety of the bottom of the box body is guaranteed. The bottom protection plate 301 can be detached and replaced after being damaged, and the overall cost is lower. The foam layer 1062 can eliminate the overall installation tolerance, form an auxiliary support for the battery, and absorb a part of the ball hitting energy during ball hitting. The peripheral foaming seal is foamed on site in time, and the precision can be controlled by a robot arm, so that the production efficiency is higher.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A battery pack (100), comprising:

the heat exchanger comprises a base plate assembly (2), wherein the base plate assembly (2) comprises heat exchange plates (21) and support plates (22) which are alternately arranged, and the heat exchange plates (21) are provided with heat exchange cavities (211) which are longitudinally communicated;

the collecting pipes (3) are arranged at two ends of the heat exchange plate (21) and are communicated with the heat exchange cavity (211);

the battery module (9) is connected with the heat exchange plate (21) through a heat conducting medium; further comprising: the side frame (1) comprises a first end arm (12), a second end arm (13) and an isolation section (14), the isolation section (14) is connected between the first end arm (12) and the second end arm, the first end arm (12), the second end arm (13) and the isolation section (14) define a cavity (11) with an opening, the bottom plate assembly (2) closes the opening of the cavity (11), and the collecting pipeline (3) is arranged in the cavity (11);

the bottom plate assembly (2) comprises heat exchange plates (21) and support plates (22) which are arranged in a staggered mode, and the first end arm (12) of the side frame (1) is connected with the upper surfaces of the heat exchange plates (21) and the upper surfaces of the support plates (22);

the end part of the supporting plate (22) is connected with the second end arm (13) of the side frame (1) so as to seal the opening of the cavity (11) at the corresponding position; the bottom plate assembly (2) further comprises a patch plate (23), and the patch plate (23) is connected with the second end arm (13) of the side frame (1) and the end part of the heat exchange plate (21) so as to seal an opening of the cavity (11) at a corresponding position.

2. The battery pack (100) according to claim 1, wherein the manifold line (3) comprises a manifold (31) and a pipe joint (32), the manifold (31) being arranged at an end of the heat exchange plate (21) and communicating with the heat exchange cavity (211).

3. The battery pack (100) according to claim 2, wherein the heat exchange cavities (211) of a plurality of the heat exchange plates (21) are connected in parallel through a header pipe (31) and a pipe joint (32) connecting two adjacent header pipes (31), and a heat exchange medium flows from one end to the other end of the plurality of the heat exchange plates (21) in the same direction in the plurality of the heat exchange cavities (211) inside the plurality of the heat exchange plates (21).

4. Battery pack (100) according to claim 2, wherein the collecting line (3) further comprises:

the flow distribution component (4), flow distribution component (4) press from both sides and establish heat transfer board (21) with between pressure manifold (31), flow distribution component (4) have multiunit orifice (41), pressure manifold (31) pass through orifice (41) with heat transfer chamber (211) communicate.

5. The battery pack (100) according to claim 4, wherein the header pipe (31) has a main circulation chamber (311) and a plurality of branch holes (312) communicating with the main circulation chamber (311), the branch holes (312) are provided corresponding to the throttle holes (41), and the plurality of heat exchange chambers (211) of the heat exchange plate (21) are connected in parallel by the header pipe (31).

6. Battery pack (100) according to claim 4, wherein the flow distributing element (4) regulates the flow by regulating the number and/or the position and/or the aperture of the orifices (41).

7. The battery pack (100) according to claim 4, wherein the flow area of the throttle hole (41) is smaller than the flow area of the open end of the heat exchange chamber (211), and the flow area of the throttle holes (41) at both ends of the flow distribution member (4) is larger than the flow area of the throttle hole (41) at the middle.

8. The battery pack (100) according to claim 4, wherein at least one of the plurality of collecting pipes (31) has a connection port (313) for communicating with an external water path, and a total flow area of all orifices (41) in the flow distribution member (4) increases as a distance from the flow distribution member (4) to the connection port (313) increases.

9. The battery pack (100) of claim 1, wherein the patch panel (23) has a first end, a second end, and a third end and a fourth end; the first end of the patch plate (23) is connected with the second end arm (13) of the side frame (1), and the second end of the patch plate (23) is connected with the end part of the heat exchange plate (21); at least one of the third end and the fourth end of the patch panel (23) is connected with the adjacent support plate (22).

10. The battery pack (100) according to any of claims 1-9, wherein the heat exchanger plate (21) is connected to the support plate (22) by means of a plug-in connection.

11. The battery pack (100) according to any one of claims 1 to 9, wherein the battery modules (9) are positioned above the heat exchange plates (21) and span between two adjacent support plates (22), and both ends of the battery modules (9) are respectively mounted with the support plates (22); and a plurality of heat conduction silica gels arranged at intervals are clamped between the battery module (9) and the heat exchange plate (21).

12. The battery pack (100) according to any one of claims 1-9, further comprising: the apron, the apron is connected the tip of side frame (1), the apron with press from both sides between side frame (1) and be equipped with sealing strip (101), sealing strip (101) have inside bend dodge section (1011), the apron with link to each other through connection structure (102) between side frame (1), connection structure (102) are located dodge the outside of section (1011) and with sealing strip (101) are spaced apart.

13. The battery pack (100) according to claim 12, wherein the cover plate is provided with a sealing groove (103) recessed away from the side frame (1), the sealing strip (101) is disposed in the sealing groove (103), the sealing groove (103) comprises a plurality of linear groove segments (1031) and an avoiding groove segment (1032) which are staggered and sequentially connected, the connecting structure (102) is connected to the outside of the avoiding groove segment (1032), and at least part of the connecting structure (102) is disposed opposite to the linear groove segments (1031) along the extending direction of the linear groove segments (1031).

14. The battery pack (100) of claim 13, wherein the cover plate comprises:

the upper cover is connected with the upper surface of the side frame (1), and the battery module (9) is arranged in an accommodating space defined by the upper cover, the side frame (1) and the bottom plate assembly (2);

the bottom guard plate (301), the bottom guard plate (301) with the lower surface of the side frame (1) is connected and is located below the bottom plate assembly (2).

15. The battery pack (100) of claim 14, wherein the bottom cover sheet (301) is spaced from the bottom plate assembly (2) to define a protective cavity (302), and the protective cavity (302) is filled with a cushioning filler (106).